The URL can be used to link to this page

MA1009-PT130412 STORM WATER POLLUTION PREVENTION PLAN "SWPPP" For Construction of: EROSION CONTROL IMPROVEMENTS FOR ANDY BROWN PARK (EAST) & ALEX DRIVE CANAL 260 EAST PARKWAY BOULEVARD COPPELL, TEXAS 75019 PERMITTEES: CITY OF COPPELL 255 PARKWAY BOULEVARD COPPELL, TEXAS 75019 AND JDK ASSOCIATES, INC. P.O. Box 557 PILOT POINT, TEXAS 76258 Owner - Copy Prepared by: Brock Environmental Services, LLC. 5332 Rochelle Road Rockwall, Texas 75032 214-771-3900 April2013 Entire Contents copyright©by Brock Environmental Services, LLC.All rights reserved. Reproduction in whole or part without permission is prohibited. Table of Contents I. INTRODUCTION 1 A. Responsibility of Secondary and Primary Operators 3 II. PROJECT DESCRIPTION 5 A. Nature of Construction Activity 5 B. Sequence of Construction Activities 5 C. Discharges Associated with Construction Support Activity 6 D. Estimate of Total Site Area and Disturbed Area 8 E. Soil Data / Quality of Discharge from Site 8 F. Storm Water Management 8 G. Surface Water and Wetlands 8 H. Standard Industrial Classification Codes 8 I. Endangered Species Information 8 J. Impaired Receiving Water and TMDL Requirements Information 8 K. Common Plan Development 8 L. Notice of Intent/ Notice of Termination / Notice of Change 8 III. STORM WATER POLLUTION MEASURES AND CONTROLS 9 A. Erosion and Sediment Controls 9 1. Soil Stabilization 9 2. Structural Controls-Temporary/Permanent 10 3. Sediment Control Practices 11 1) Sediment Basins 11 2) Perimeter Controls and Controls for sites less than 10 acres 11 4. Storm Water Management Controls 11 B. Other Controls 11 1. Dust Control / Offsite Vehicle Tracking 11 2. Waste Disposal 12 3. Sanitary/Septic 12 4. Water Source, 12 5. Construction Phase "Best Management Practices" 12 6. Hazardous Material Storage 13 7. Spill Prevention and Response 13 8. Concrete Saw Cutting 14 Table of Contents Continued... 9. Concrete Truck Washout Requirement 14 10. Storm Water Runoff from Concrete Batch Plants 15 IV. STATE AND LOCAL PROGRAMS 15 V. INSPECTION AND MAINTENANCE 16 A. Material Storage Inspections 17 B. Soil Stabilization Inspections 17 C. Erosion and Sediment Control Inspections 17 VI. MODIFICATIONS/ REVISIONS To SWPPP 19 VII. PROCEDURAL REQUIREMENTS 20 VIII. PREPARER'S CERTIFICATION IX APPEND ICES A. CONTRACTOR CERTIFICATION/SUBCONTRACTOR CERTIFICATIONS B. DELEGATION LETTERS C. TPDES CONSTRUCTION SITE NOT ICES(To BE POSTED AT SITE) SMALL CONSTRUCTION SITE NOTICE/SECONDARY SITE NOTICE/LARGE SITE NOTICE/LOW POTENTIAL FOR EROSION SMALL SITE NOTICE D. NOl/NOT/NOC FORM E. ENDANGERED SPECIES CERTIFICATION /IMPAIRED RECEIVING WATER BODIES LISTING F. LIST OF POTENTIAL POLLUTANTS G. SWPPP UPDATE FORM/RECORD OF MAJOR GRADING ACTIVITIES/CHANGES IN SITE CONDITIONS H. RECORD TEMPORARY OR PERMANENT CEASED CONSTRUCTION ACTIVITIES/RECORD OF STABILIZATION MEASURES I. PROJECT DESCRIPTION, SURFACE WATER MAP, VICINITY MAP, EROSION AND SEDIMENT CONTROL PLAN WITH DRAINAGE CHARACTERISTICS, DETAILS AND SPECIFICATIONS J. INSPECTOR QUALIFICATIONS/INSPECTION REPORTS/RAIN EVENT LOG K ISWM TECHNICAL MANUAL BEST MANAGEMENT PRACTICE'S/EFFLUENT LIMITATIONS AND GUIDELINES L. TPDES GENERAL PERMIT NUMBER TXR150000FOR CONSTRUCTION ACTIVITIES M. CONCRETE BATCH PLANTS REQUIREMENTS/MATERIAL MANAGEMENT SHEET/POLLUTION PREVENTION TEAM/EMPLOYEE TRAINING FORM/QUARTERLY VISUAL MONITORING FORM/ ANNUAL COMPREHENSIVE COMPLIANCE FORM/NON-STORM WATER DISCHARGES/DMR REPORT/RAIN GAUGE LOG N. SPILL PREVENTION AND RESPONSE PROCEDURES, CONTACT NUMBERS AND SPILL RESPONSE FORMS O. DEFINITIONS Storm Water Pollution Prevention Plan `SWPPP" Brock Environmental Services, LLC. I. INTRODUCTION This Storm Water Pollution Prevention Plan (SWP3) has been prepared for the proposed construction for; Andy Brown Park (East) & Alex Drive Canal located at 260 East Parkway Boulevard, in the City of Coppell, Dallas County Texas. This plan has been prepared as a shared plan covering activities of the General Contractor/ Primary Operator: JDK Associates, Inc. and the Owner/ Secondary Operator City of Coppell. The purpose of this SWPPP is to provide guidelines for preventing or minimizing soil and pollutants that originate on the construction site from flowing into surface water bodies during the construction period. It addresses the principal activities known to disturb significant amounts ground surface during construction. This SWPPP terminates when areas disturbed for this project reach full stabilization. From a regulatory standpoint, the site has achieved full stabilization once all areas are paved or have at least 100% vegetative coverage with a 70% density. The Primary Operator referred to in this SWPPP is JDK Associates, Inc. The Secondary Operator is the City of Coppell. The MS4 Operator for this project is: City of Coppell Address: City of Coppell Attn: Public Works P.O. Box 9478 Coppell, TX 75019 The MS4 Operator (City of Coppell) will need to be notified of this project prior to the start of construction with a Construction Site Notice. Upon completion of all construction activities and once the site has been stabilized with vegetation, a construction site notice with the dates of completion will need to be submitted to the MS4 Operator as well. The Construction Site Notices are located in Appendix C. Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April 2013 Page 1 of 20 Storm Water Pollution Prevention Plan "SWPPP" Brock Environmental Services, LLC. The Texas general permit for construction activities provides for the following types of non- storm water discharges, which could originate at the site: 1. Discharges from fire fighting activities (fire fighting activities do not include washing of trucks, run-off water from training activities, test water from fire suppression systems, and similar activities); 2. Uncontaminated fire hydrant flushings (excluding discharges of hyperchlorinated water, unless the water is first dechlorinated and discharges are not expected to adversely affect aquatic life), which include flushings from systems that utilize potable water, surface water, or groundwater that does not contain additional pollutants (uncontaminated fire hydrant flushings do not include systems utilizing reclaimed wastewater as a source water); 3. Water from the routine external washing of vehicles, the external portion of buildings or structures, and pavement, where detergents and soaps are not used and where spills or leaks of toxic or hazardous materials have not occurred (unless spilled materials have been removed; and if local state, or federal regulations are applicable, the materials are removed according to those regulations), and where the purpose is to remove mud, dirt, or dust; 4. Uncontaminated water used to control dust; 5. Potable water sources including waterline flushings (excluding discharges of hyperchlorinated water, unless the water is first dechlorinated and discharges are not expected to adversely affect aquatic life); 6. Uncontaminated air conditioning condensate; 7. Uncontaminated ground water or spring water, including foundation or footing drains where flows are not contaminated with industrial materials such as solvents; and 8. Lawn watering and similar irrigation drainage. Other Permitted Discharges Any discharge authorized under a separate NPDES, TPDES, or TCEQ permit may be combined with discharges authorized by this general permit, provided those discharges comply with the associated permit. The storm water management controls included in this SWPPP focus on providing control of pollutant discharges with practical approaches that utilizes readily available techniques, expertise, material and equipment. The necessary forms for implementing the SWPPP are included in the Appendices including the Contractor and Sub-Contractor Certifications, Delegation Letters, Construction Site Notices, Project Description, Surface Water Maps, Erosion Control Plans, Impaired Receiving Waters and TMDL Requirements, Effluent Limitation Guidelines and Best Management Practices, Inspector Qualifications and Reports. Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April 2013 Page 2 of 20 Storm Water Pollution Prevention Plan "SWPPP" Brock Environmental Services, LLC, A. Responsibility of Operators The Primary Operators and Secondary Operators with control over construction plans and specifications must: • Ensure the project specifications allow or provide that adequate BMPs are developed to meet the requirements of Part III of this general permit; • Ensure that the SWP3 indicates the areas of the project where they have control over project specifications, including the ability to make modifications in specifications; • Ensure all other operators affected by modifications in project specifications are notified in a timely manner so that those operators may modify their BMP's as necessary to remain compliant with the conditions of the general permit; and • Ensure that the SWP3 for portions of the project where they are operators indicates the name and site-specific TPDES authorization numbers for permittees with the day-to-day operational control over those activities necessary to ensure compliance with the SWP3 and other permit conditions. If the party with day-to-day operational control has not been authorized or has abandoned the site, the person with control over project specifications is considered to be the responsible party until the authority is transferred to another party and the SWP3 is updated. The Primary Operator with day-to-day operational control of those activities at a project that are necessary to ensure compliance with an SWP3 and other permit conditions must ensure that the SWP3 accomplishes the following requirements: • Meets the requirements of this general permit for those portions of the project where they are operators; • Identifies the parties responsible for implementation of best management practices (BMPs) described in the SWP3; • Includes, for areas where they have operational control over day-to-day activities, the name and site-specific TPDES authorization number of the parties with control over project specifications, including the ability to make modifications in specifications Secondary Operator: City of Coppell Primary Operator with Day to Day Operational Control: JDK Associates, Inc. Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April2013 Page 3 of 20 Storm Water Pollution Prevention Plan "SWPPP" Brock Environmental Services, LLC. Additional Requirements for the Primary Operator with Day to Day Operational Control • Post the signed, dated copy of the Construction Site Notices, prior to the start of construction, at the construction site in a location that is readily available for viewing by the general public and all inspectors from local and state agencies • A copy of the Construction Site Notices must be posted at all times thru out the duration of the project until the site has been stabilized and all erosion controls have been removed. • A Storm Water Pollution Prevention Plan (this SWPPP) must be completed and implemented for the project prior to Construction. • A signed copy of the SWPPP should be retained at the project site at all times • City of Coppell, JDK Associates, Inc. and all subcontractors must sign the appropriate certification statement in Appendix A • This SWPPP must be updated each time there are significant modifications to major construction activities, contractors or pollutant control practices • JDK Associates, Inc. will provide qualified personnel to conduct inspections of the project as described previously to assure compliance with the SWPPP. Based on inspection results, the SWPPP and pollution prevention control techniques must be modified by the contractors if necessary to assure that storm water or the identified non-storm water discharges are the only discharges leaving the project site • The SWP3 must be retained on-site at the construction site or, if the site is inactive or does not have an on-site location to store the plan, a notice must be posted describing the location of the SWP3 • If the SWP3 is retained off-site, then it shall be made available as soon as reasonably possible. In most instances, it is reasonable that the SWP3 shall be made available within 24 hours of the request • Discharge of hazardous substances or oil into storm water is subject to reporting requirements. Refer to TPDES general permit for specific guidelines. Each contractor is responsible for complying with these reporting requirements • Questions about the TPDES program can be directed to the Texas Commission on Environmental Quality. A copy of the TPDES General Permit Number TXR150000 is included for reference Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. Apr/12013 Page 4 of 20 Storm Water Pollution Prevention Plan "SWPPP" Brock Environmental Services, LLC. II. PROJECT DESCRIPTION A. Nature of Construction Activity This project consists of constructing erosion control repairs and improvements. The project lies in and near Andy Brown Park East, and includes lake edge treatment around the central activity lake, both sides of the canal north of Parkway Boulevard, and 700 linear feet of the east bank south of Parkway Boulevard. This project will include unclassified channel excavation, the construction of new retaining wall, the installation of geosynthetic soil stabilization, the installation and/or adjustment of related drainage facilities, and all related appurtenances. Construction activities included in this project are: installation of erosion controls, clearing and grading, excavation and embankment, stockpiling and removal, construction of stone wall, rock rip rap and all related appurtenances, paving for trail replacement, adjustments to drainage facilities, backfilling operations and final grading and landscaping for final stabilization. JDK Associates, Inc. is responsible for submitting a copy of the Construction Site Notice to the City of Coppell prior to the start of construction. Once the construction site notice has been submitted, mobilization of equipment may begin with installation of erosion controls, grading and clearing for the first phase of this project. The second grouping of activities includes excavation and embankment, stockpiling and removal, retaining wall construction, placement of geosynthetic soil stabilization and lake edge treatments, adjustments to drainage facilities and paving for trail replacement and all related appurtenances. The last activities will be placement of topsoil, final grading and seeding or sodding for final stabilization. Following the final site cleanup and stabilization, temporary erosion controls will be removed from the site. When all construction is completed and the site stabilized a construction site notice with the completion date will need to be submitted to the City of Coppell. Refer to Appendix D. B. Sequence and Schedule of Construction Activities The schedule of construction activities is listed below. The anticipated sequences of construction activities, which will disturb significant amounts of soil, are provided on the next page. Project scheduled start date is: April 2013 Scheduled completion date: September 2013 Erosion Controls will be installed: April 2013 Dates of Final Stabilization anticipated: September 2013 Entire Contents copyright 0 by Brock Environmental Services, LLC. All rights resented. Reproduction in whole or part without permission is prohibited. April2013 Page 5 of 20 Storm Water Pollution Prevention Plan "SWPPP" Brock Environmental Services, LLC. Specific activities include: • Installation of sediment controls will begin at the time of mobilization for the equipment and materials. These activities will be the first activities at the site and will be completed prior to any dirt work. • All construction contractors staging will take place at the site and no offsite staging areas will be used. • Preparation of R.O.W., establish perimeter controls using silt fence as necessary for temporary erosion control. • Grading, clearing • Stockpiling and removal • Excavation and embankment • Construction of retaining walls and lake edge treatments • Geosynthetic soil stabilization • Final grading • Landscaping and final stabilization • When construction is complete, the site is stabilized and approved by the Engineer, remove all temporary sediment controls and reseed any areas disturbed by their removal • Submit a Construction Site Notice to the City of Coppell with the dates of completion filled in. (Appendix C) A detailed site description may be found in Appendix I: Project Description Primary Operator-JDK Associates, Inc. 1. Provide stabilized construction entrances and sediment barriers. Clean the existing rock and /or add rock as necessary to prevent mud and dirt from being tracked onto existing public streets. 2. Maintain silt fence and construction entrance throughout the duration of the project. Replace if required. Remove silt and mud, in order to restore sediment containment capacity. 3. Maintain erosion control measures during all phases of construction, landscaping or temporary vegetation. 4. Remove and dispose of the erosion controls once their use is no longer needed. Locations for structural controls and details are shown on the Erosion Control Plan (Appendix I) C. Discharges Associated with Construction Support Activity Examples of construction support activities include, but are not limited to, concrete batch plants, rock crushers, asphalt batch plants, equipment staging areas, material storage yards, material borrow areas, and excavated material disposal areas. Discharges of storm water runoff from construction support activities may be authorized under this general permit, provided that the following conditions are met: Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. Apri12013 Page 6 of 20 Storm Water Pollution Prevention Plan "SWPPP" Brock Environmental Services, LLC. (a) the activities are located within one (1)-mile from the boundary of the permitted construction site and directly support the construction activity; (b) an SWP3 is developed for the permitted construction site according to the provisions of this general permit, and includes appropriate controls and measures to reduce erosion and discharge of pollutants in stormwater runoff from the construction support activities; and (c) the construction support activities either do not operate beyond the completion date of the construction activity or, at the time that they do, are authorized under separate Texas Pollutant Discharge Elimination System (TPDES) authorization. Separate TPDES authorization may include the TPDES Multi Sector General Permit (MSGP), TXR050000, or coverage under an alternative general permit if available, or authorization under an individual water quality permit. Batch Plant This project will not include a batch plant to be used as part of this project. Designated concrete washout areas are to be shown on the Erosion Control Plan located in Appendix I once the location has been determined. Concrete Washout Areas All projects must have a designated concrete wash out area(s). A concrete washout pit or other containment shall be installed a minimum of 50 feet away from inlets, swales, drainage ways, channels, and other waters, if the site configuration provides sufficient space to do so. In no case shall concrete washout occur closer than 20 feet from inlets, swales, drainage ways, channels and other waters. Stock Piles: Areas where excavated or additional materials (fill) will be stored will be shown on the erosion plan. Material Storage Areas: These areas should be maintained to keep material limited on the site to materials needed the job. Liquid containers must be kept closed when fluids are not being removed, and drip pans must be used under any containers with valves or spigots attached. Equipment Staging Areas: Additional erosion controls may be needed to prevent offsite tracking. Any petroleum products stored in the staging area must be in closed containers in good condition to prevent leaking. Locations for structural controls and details for any of the above areas must be show on the Erosion Control Plan. If the locations of these areas are not known at the time the SWPPP is developed, it is the responsibility of JDK Associates, Inc. to update the Erosion Control Plans to show the exact location of these areas. If you need assistance with these updates, or have questions about updating your SWPPP, please contact Brock Environmental Services, so we can assist you with these updates. Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. Apri12013 Page 7 of 20 Storm Water Pollution Prevention Plan "SWPPP" Brock Environmental Services, LLC. D. Estimate of Total Site Area and Disturbed Areas The total area for this project consists of approximately 3.90 acres of which 3.90 acres will be disturbed by this project. E. Soil Data /Quality of Discharge from site. Soils primarily consist of Trinity clay. Refer to the Natural Resources Conservation Service Web Soil Survey for additional information regarding soil type. No information on the quality of discharge from the site has been provided. F. Storm Water Management Storm water runoff within the work areas of the lake will be maintained within the lake, all areas outside of the lake will be provided by inlets and storm sewer system which carry drainage from within the parking lots and roadways and drains to natural facilities maintained by the City of Coppell. G. Surface Waters and Wetlands The potential receiving water bodies are: Denton Creek. To the best of our knowledge, this project is not located within any known wetland areas. H. Standard Industrial Classification Codes The major construction activities will have the Standard Industrial Classification codes listed below: 1629 I. Endangered Species Information To the best of our knowledge, there are neither endangered or threatened species nor critical habitat found in the proximity of this project. See Appendix E J. Impaired Receiving Water and TMDL Requirements This projects discharges into segment 0825 and is not listed on the Texas 303 (d) list of impaired waters. See Appendix E K. Common Plan Development This project is not considered as part of a larger common plan of development. Any project that has a disturbed area less than one acre, but that is part of a larger plan of development must follow the guidelines for construction of a Large Project, and the Operator of the project must file an NOI and upon completion of the project an NOT must be filed. L. Notice of Intent/ Notice of Termination / Notice of Change This project is considered as a small project with a disturbed area less than 5 acres no NOI is needed for this project. Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April2013 Page 8 of 20 Storm Water Pollution Prevention Plan "SWPPP" Brock Environmental Services, LLC. III. STORM WATER POLLUTION MEASURES AND CONTROLS A. Erosion and Sediment Controls Erosion and sediment control practices can be divided into three broad categories: (1) soil stabilization, (2) structural controls, and (3) management practices. Each of these categories has temporary and permanent control measures to be considered. Soil stabilization and structural practices will be installed and maintained in accordance with the Project construction drawings and specifications. 1. Soil Stabilization Stripping of vegetation will be conducted in a manner that minimizes erosion. Cut and fill operations will follow the grading plans and be kept to a minimum where practicable. JDK Associates, Inc. is responsible for planting vegetation (and establishing 100% coverage with at least 70% density) on all ground disturbed during construction and is responsible for watering and maintaining the vegetation until final project is accepted by City of Coppell. Erosion control and stabilization measures must be initiated immediately in portions of the site where construction activities have temporarily ceased and will not resume for a period exceeding 14 calendar days. Stabilization measures that provide a protective cover must be initiated immediately in portions of the site where construction activities have permanently ceased. The term "immediately" is used to define the deadline for initiating stabilization measures. In the context of this requirement, "immediately" means as soon as practicable, but no later than the end of the next work day, following the day when the earth-disturbing activities have temporarily or permanently ceased. Except as provided in (A) through (D) below, these measures must be completed as soon as practicable, but no more than 14 calendar days after the initiation of soil stabilization measure: (A) Where the initiation of stabilization measures by the 14th day after construction activity temporarily or permanently ceased is precluded by snow cover or frozen ground conditions, stabilization measures must be initiated as soon as practicable. (B) In arid areas, semi-arid areas, or drought-stricken areas where the immediate initiation of stabilization measures after construction activity has temporarily or permanently ceased or is precluded by arid conditions, erosion control and stabilization measures must be initiated as soon as practicable. Where vegetative controls are not feasible due to arid conditions, the operator shall immediately install, and within 14 calendar days of a temporary or permanent cessation of work in any portion of the site complete, non-vegetative erosion controls. If non-vegetative controls are not feasible, the operator shall install temporary sediment controls. Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April 2013 Page 9 of 20 Storm Water Pollution Prevention Plan SWPPP" Brock Environmental Services, LLC. (C) In areas where temporary stabilization measures are infeasible, the operator may alternatively utilize temporary perimeter controls. The operator must document in the SWP3 the reason why stabilization measures are not feasible, and must demonstrate that the perimeter controls will retain sediment on site to the extent practicable. The operator must continue to inspect the BMPs at the frequency established in Section III.F.7.(a) for unstabilized sites. (D) If the initiation or completion of vegetative stabilization is affected by circumstances beyond the control of the permittee, vegetative stabilization must be initiated or completed as soon as conditions or circumstances allow it on the site. The requirement to initiate stabilization is triggered as soon as it is known with reasonable certainty that work will be stopped for 14 or more additional calendar days. TCEQ does not expect that temporary or permanent stabilization measures to be applied to areas that are intended to be left un-vegetated or unstabilized following construction (e.g., dirt access roads, utility pole pads, areas being used for storage of vehicles, equipment, or materials). Final stabilization must be achieved prior to termination of permit coverage. Refer to Appendix K"Best Management Practices"for details on stabilization measures. 2. Structural Controls -Temporary/ Permanent Erosion and sediment controls will be constructed and maintained according to the standards in the construction drawings and specifications, and the site map. Listed below are the structural controls to be used at the Project site. Temporary Controls • Erosion Control Logs • Silt Fence • Construction Entrance Permanent Controls • Rock Rip Rap • Stone Cut Block Wall • Seeding and Landscaping Refer to the Erosion Plan located in Appendix I for details and specifications for the structural controls Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April2013 Page 10 of 20 Storm Water Pollution Prevention Plan `SWPPP" Brock Environmental Services, LLC. 3. Sediment Control Practices 1. Sediment Basins A sedimentation basin is required, where feasible, for a common drainage location that serves an area with ten (10) or more acres disturbed at one time. A sedimentation basin may be temporary or permanent, and must provide sufficient storage to contain a calculated volume of runoff from a 2-year, 24-hour storm from each disturbed acre drained. If a sedimentation basin is not feasible, then the permittee shall provide equivalent control measures until final stabilization of the site. In determining whether installing a sediment basin is feasible, the permittee may consider factors such as site soils, slope, available area, public safety, precipitation patterns, site geometry, site vegetation, infiltration capacity, geotechnical factors, depth to groundwater, and other similar considerations. The permittee shall document the reason that the sediment basins are not feasible, and shall utilize equivalent control measures, which may include a series of smaller sediment basins Unless infeasible, when discharging from sedimentation basins and impoundments, the permittee shall utilize outlet structures that withdraw water from the surface. 2. Perimeter Controls and Controls for Sites with Disturbed Area Less Than 10 Acres. At a minimum, silt fences, vegetative buffer strips, or equivalent sediment controls are required for all down slope boundaries of the construction area, and for those side slope boundaries deemed appropriate as dictated by individual site conditions 4. Storm Water Management Controls Storm water management during construction will consist of containing pollutants on the site. Soil is the most significant potential pollutant. It will be contained by the Silt Barriers and Sediment Traps. These controls must be properly installed and maintained by JDK Associates, Inc. in order to contain soil on the site. Chemicals, fuels and similar potential pollutants will be contained by careful handling and storage and by utilizing portable or plastic covered Earth Containment Berms as needed. B. Other Controls 1. Dust Control /Off-site Vehicle Tracking During construction, water trucks will be used by JDK Associates, Inc. to reduce dust as needed. After construction, the site will be stabilized as described elsewhere in order to reduce dust. Entire Contents copyright■ by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April 2013 Page 11 of 20 Storm Water Pollution Prevention Plan `SWPPP" Brock Environmental Services, LLC. Construction traffic shall enter and exit at the site at a Construction Entrance, which will be stabilized after the completion of the project. Construction traffic will enter and exit the work area at a Construction Entrance with a stabilized rock entrance or equivalent device. The purpose of the rock entrance is to minimize the amount of soil and mud that is tracked onto existing streets. If sediment escapes the project site, offsite accumulations of sediment will be removed at a frequency sufficient to minimize offsite impacts. 2. Waste Disposal a. All solid waste materials, including disposable materials incidental to the major construction activities, will be collected in containers. The containers will be emptied periodically and hauled to a landfill. Each container must be covered to prevent the blowing of debris from the container. Each contractor is responsible for proper disposal of his own trash. b. Substances that have the potential for polluting surface and/or groundwater must be controlled by whatever means necessary to ensure that they do not discharge from the site. It is the responsibility of each contractor to make sure pollutant discharge is avoided. As an example, special care shall be exercised during equipment fueling and servicing operations. If a spill occurs, it shall be contained and disposed of so that it will not flow from the site or soak in to the soil. In this regard, potentially polluting substances shall be handled in a manner consistent with the impact they represent. 3. Sanitary/Septic Contractors shall comply with all Federal, State and local sanitary sewer septic system regulations. Temporary portable sanitary facilities shall be provided at the site by each contractor throughout construction activities. They shall be utilized by construction personnel and serviced regularly by a commercial operator. All Expenses associated with providing sanitary facilities are the responsibility of the contractors. 4. Water Source Water used to establish and maintain grass, to control dust, and for other purposes during the construction phase must originate from a public water supply or private well approved by the Texas State Department of Health. Temporary fire hydrants meters shall be used until such time the potable water is available within the site. 5. Construction Phase "Best Management Practices" (BMPs) During the construction phase, JDK Associates, Inc. will also implement the following measures listed on the next page: Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. Apri12013 Page 12 of 20 Storm Water Pollution Prevention Plan SWPPP" Brock Environmental Services, LLC. a. Equipment fueling, maintenance and cleaning will only be done in protected areas. The areas will be surrounded by a temporary 15" high perimeter Liquid tight Earth Containment Berm with a liner covered by plastic sheeting. b. Equipment wash down (except for wheel washes) shall take place within an area surrounded by an Earth Containment Berm. Use of detergents is prohibited. c. Chemicals, paints, solvents, fertilizers and other toxic or hazardous materials shall be stored in waterproof containers. Except during application, the containers shall be kept in trucks or within storage facilities. Run-off containing such materials shall be collected, removed from the site and disposed of at an approved solid waste or chemical disposal facility. 6. Hazardous Material Storage Chemicals, fertilizers and other toxic or hazardous materials should be stored in their original containers (if original container is not resealable, store the products in clearly labeled, waterproof containers). Except during application, the containers should be kept in trucks or in bermed areas within covered storage facilities. Storm water runoff containing such materials shall be collected, removed from the site and disposed of in accordance with the federal, state and local regulations. As may be required by federal, state or local regulations, the Operator should have a Hazardous Materials Management Plan and/or Hazardous Materials Spill and Prevention Program in place. A foreman or supervisor should be designated in writing to oversee, enforce and instruct construction workers on proper hazardous materials storage and handling procedures. Should hazardous materials be stored on site this erosion and sediment control plan shall be annotated to indicate where the materials will be stored. These additional controls are necessary to minimize or prevent pollutants, such as chemicals, oil and grease, metals, floatables, and sanitary wastes from entering storm water runoff. 7. Spill Prevention and Response Consistent with the general permit requirements, all potential pollutants other than sediment will be handled and disposed of in a manner that does not cause contamination of storm water. Non-sediment pollutants that may be present during construction activities include: • Petroleum products including fuel, lubricants, hydraulic fluids, and form oils. • Polymer used for soil stabilization Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April 2013 Page 13 of 20 Storm Water Pollution Prevention Plan "SWPPP" Brock Environmental Services, LLC. • Water treatment chemicals (coagulant, acid, sodium bicarbonate) • Concrete • Paints • Fertilizers These materials, and other materials used during construction with the potential to impact storm water, will be stored, managed, used, and disposed of in a manner that minimizes the potential for releases to the environment and especially into storm water. Spill Response Procedures, Contact Numbers and Spill Response Forms are included in Appendix N 8. Concrete Saw Cutting Concrete waste at construction sites comes in two forms: 1) excess fresh concrete mix including truck and equipment washing, and 2) concrete dust and concrete debris resulting from demolition. Both forms have the potential to impact water quality through storm water runoff contact with the waste. Slurry Collection & Disposal During saw cutting operations, the slurry and cuttings shall be continuously vacuumed to control the flow of water from the operations site. The slurry and cuttings shall not be allowed to drain to the storm drain system, swale, stream or other water body. The slurry and cuttings shall not be allowed to remain on the pavement to dry out. Collected slurry and cuttings shall be discharged in an area protected by one or more sediment removal BMPs and shall be done in a manner that does not result in a violation of groundwater or surface water quality standards. Never dump waste illicitly or without property owner's knowledge and consent. Slurry may be disposed of in facilities designated for washdown of concrete trucks. 9. Concrete Truck Wash Out Requirements Direct discharge of concrete truck wash out water to surface water in the state, including discharge to storm sewers, is prohibited by this general permit. The discharge of wash out water shall not cause or contribute to groundwater contamination. Wash out of concrete trucks during rainfall events shall be minimized Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April 2013 Page 14 of 20 Storm Water Pollution Prevention Plan `SWPPP" Brock Environmenta/Services, LLC. Concrete truck wash out water shall be discharged to areas at the construction site where structural controls have been established to prevent direct discharge to surface waters, or to areas that have a minimal slope that allow infiltration and filtering of wash out water to prevent direct discharge to surface waters. Structural controls may consist of temporary berms, temporary shallow pits, temporary storage tanks with slow rate release, or other reasonable measures to prevent runoff from the construction site. The direct discharge of concrete truck wash out water is prohibited at all times, and the operator shall insure that its BMPs are sufficient to prevent the discharge of concrete truck washout as the result of rain. The SWP3 shall include concrete wash out areas on the associated maps in Appendix I. 10. Storm Water Runoff from Concrete Batch Plants Discharges of storm water runoff from concrete batch plants at regulated construction sites may be authorized under the provisions of this general permit provided that the following requirements are met for concrete batch plant(s) authorized under the General Permit. This permit does not authorize the discharge or land disposal of any wastewater from concrete batch plants at regulated construction sites. Authorization for these wastes must be obtained under an individual permit or an alternative general permit. See Appendix M for Concrete Batch Plants Requirements IV. STATE AND LOCAL PROGRAMS To the best Knowledge of all parties involved with the implementation of this SWP3, all measures and considerations specified in this plan meet the requirements of the TCEQ TPDES General Permit TXR150000, the City of Coppell and Dallas County. A. Permittees must ensure that the SWP3 is consistent with requirements specified in applicable sediment and erosion site plans or site permits, or stormwater management site plans or site permits approved by federal, state, or local officials. B. SWP3s must be updated as necessary to remain consistent with any changes applicable to protecting surface water resources in sediment erosion site plans or site permits, or stormwater management site plans or site permits approved by state or local official for which the permittee receives written notice. Entire Contents copyright by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April2013 Page 15 of 20 Storm Water Pollution Prevention Plan `SWPPP" Brock Environmental Services, LLC. V. INSPECTION AND MAINTENANCE All disturbed areas, as well as all erosion and sediment controls devices, will be inspected every fourteen (14) calendar days and after a rain event greater than 1/2 inch or as an alternative the inspection schedule may be developed to require that these inspections will occur at least once every seven (7) calendar days. If this alternative schedule is implemented, then the inspection must occur on a specifically defined day, regardless of whether or not there has been a rainfall event. The schedule may be changed a maximum of one (1) time each month, the schedule must be implemented at the beginning of a calendar month, and the reason for the schedule must be documented in this SWPPP. Inspections shall be conducted, and a written report prepared by a qualified personnel familiar with the TPDES general permit, this SWPPP and the project. Personnel provided by the JDK Associates, Inc. must inspect disturbed areas of the construction site that have not been finally stabilized, areas used for storage of materials that are exposed to precipitation, discharge locations, and structural controls for evidence of, or the potential for, pollutants entering the drainage system. Personnel conducting these inspections must be knowledgeable of the general permit, familiar with the construction site, and knowledgeable of the SWP3 for the site. Sediment and erosion control measures identified in the SWP3 must be inspected to ensure that they are operating correctly. Locations where vehicles enter or exit the site must be inspected for evidence of off-site sediment tracking. The SWP3 must be modified based on the results of inspections, as necessary, to better control pollutants in runoff. Revisions to the SWP3 must be completed within seven (7) calendar days following the inspection. If existing BMPs are modified or if additional BMPs are necessary, an implementation schedule must be described in the SWP3 and wherever possible those changes implemented before the next storm event. In the event of flooding or other uncontrollable situations which prohibit access to the inspection sites, inspections must be conducted as soon as access is practicable. Utility line installation, pipeline construction, and other examples of long, narrow, linear construction activities may provide inspection personnel with limited access to the areas an d inspection of these areas could require that vehicles compromise temporarily or even permanently stabilized areas, cause additional disturbance of soils, and increase the potential for erosion. In these circumstances, controls must be still be inspected at least once every 14 days and rain events, but representative inspections may be performed. For representative inspections, personnel must inspect controls along the construction site for 0.25 mile above and below each access point where a roadway, undisturbed right-of- way, or other similar feature intersects the construction site and allows access to the areas. JDK Associates, Inc. will keep a current copy of the SWPPP on the project site, post the construction site notice, and insert inspection report forms (Appendix J) (and all other documents relating to storm water pollution prevention) in the Plan. JDK Associates, Inc. will provide qualified personnel to perform the mandatory 14 day/ Rain Event Inspections. Refer to Appendix J for Inspector Name, Qualifications and Reports. Entire Contents copyright 0by Brock Environment Services, C. . , h__ ved ., ..._. .,..... tal Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April 2013 Page 16 of 20 Storm Water Pollution Prevention Plan "SWPPP" Brock Environmental Services, LLC. A. Material Storage Inspections Inspectors must evaluate areas used for storage of materials that are exposed to precipitation. The purpose is to ensure that materials are protected and/or impounded so that pollutants cannot discharge from storage areas. Offsite material storage areas used solely by the subject project (none anticipated) are considered to be part of the project by the TCEQ and must be included in the site inspection report. B. Soil Stabilization Inspections Seeded areas will be inspected to confirm that a healthy stand of grass is maintained. The site has achieved final stabilization once all areas are covered with pavement, or have a stand of grass with at least 70% uniform density. The density of 70% or greater must be maintained to be considered as stabilized. The contractor is responsible for watering, fertilizing and reseeding disturbed areas as needed to achieve this goal. C. Erosion and Sediment Control Inspections All controls will be inspected at least once every fourteen (14) calendar days. It is also recommended that "walk through inspections" be conducted prior to storm events. The following is a list of inspection/maintenance practices that will be used for specific controls: Silt Fencing: Silt fence should be inspected regularly for buildup of excess sediment, undercutting, sags, and other failures. Sediment should be removed when it reaches approximately one-half the height of the fence. In addition, determine the source of excess sediment and implement appropriate BMPs to control the erosion. If the fabric becomes damaged or clogged, it should be repaired or replaced as necessary. Sediment Logs: Logs should be inspected regularly for buildup of excess sediment, undercutting, sags, and other failures. Sediment should be removed when it reaches approximately one-half the height of the tube. In addition, determine the source of excess sediment and implement appropriate BMPs to control the erosion. Construction Entrance: Additional stone/rock will be placed at the construction entrance as needed to prevent tracking of mud onto public roads. All material spilled, dropped, wash, or tracked onto roadways from vehicles leaving the site will be removed immediately. Vegetation: Protect newly seeded areas from excessive runoff and traffic until vegetation is established. Establish a watering and fertilizing schedule. Erosion Control Blankets:Should be inspected regularly for bare spots caused by weather related events. Missing or loose blankets must be replaced or re-anchored. Also check for excess sediment deposited from runoff. Remove sediment and/or replace blanket if necessary. Entire Contents copyright 0 by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April2013 Page 17of20 Storm Water Pollution Prevention Plan "SWPPP" Brock Environmental Services, LLC. Concrete Waste: Concrete waste at construction sites comes in two forms: 1) excess fresh concrete mix including truck and equipment washing, and 2) concrete dust and concrete debris resulting from demolition, saw cutting and batching. All these forms have the potential to impact water quality through storm water runoff contact with the waste. Concrete Washout: All concrete truck washouts shall be discharged in an area protected by one or more sediment removal BMPs and shall be done in a manner that does not result in a violation of groundwater or surface water quality standards. Good Housekeeping: Litter, demolition debris, and equipment chemicals exposed to storm water shall be prevented from becoming a pollutant source for storm water discharges by means of screening of outfalls and daily pickup of litter. Discharge of Standing Water: Discharge of standing water will not occur unless the discharge will not cause an exceedance of Surface Water Quality Limits. Rain Fall Log is located in Appendix J Maintenance Requirements All protective measures identified in the SWP3 must be maintained in effective operating condition. If, through inspections or other means, the permittee determines that BMPs are not operating effectively, then the permittee shall perform maintenance as necessary to maintain the continued effectiveness of stormwater controls, and prior to the next rain event if feasible. If maintenance prior to the next anticipated storm event is impracticable, the reason shall be documented in the SWP3 and maintenance must be scheduled and accomplished as soon as practicable. Erosion and sediment controls that have been intentionally disabled, run-over, removed, or otherwise rendered ineffective must be replaced or corrected immediately upon discovery. If periodic inspections or other information indicates a control has been used incorrectly, is performing inadequately, or is damaged, then the operator shall replace or modify the control as soon as practicable after making the discovery. Sediment must be removed from sediment traps and sedimentation ponds no later than the time that design capacity has been reduced by 50%. For perimeter controls such as silt fences, berms, etc., the trapped sediment must be removed before it reaches 50% of the above-ground height. If sediment escapes the site, accumulations must be removed at a frequency that minimizes off-site impacts, and prior to the next rain event, if feasible. If the permittee does not own or operate the off-site conveyance, then the permittee shall work with the owner or operator of the property to remove the sediment. Entire Contents copyright 0 by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April 2013 Page 18 of 20 Storm Water Pollution Prevention Plan "SWPPP" Brock Environmental Services, LLC. VI. MODIFICATIONS / REVISIONS TO SWPPP THE SWPPP MUST BE REVISED OR MODIFIED IF ANY OF THE FOLLOWING OCCUR: A change in design, construction, operation, or maintenance that has a significant effect on the discharge of pollutants and that has not been previously addressed in the SWP3 Changing site conditions based on updated plans and specifications, new operators, new areas of responsibility, and changes in BMPs; or Results of inspections or investigations by site operators, operators of a municipal separate storm sewer system receiving the discharge, authorized TCEQ personnel, or federal, state or local agency approving sediment and erosion plans indicate the SWP3 is proving ineffective in eliminating or significantly minimizing pollutants in discharges authorized under the general permit. Based on inspection results, any necessary modification to this SWPPP shall be implemented within seven (7) calendar days of the inspection. A modification is necessary if a control measure or operational procedure does not provide adequate pollutant control. All revisions shall be recorded on the Update Form (Appendix G) within seven calendar days of the inspection. It is the responsibility of each operator or subcontractor to maintain effective pollutant discharge controls. Physical site conditions or contractor/subcontractor practices could make it necessary to install more controls than were originally planned. For example, localized concentrations of surface runoff or unusually steep areas could require additional silt barrier, or other structural controls. Assessing the need for, and installing additional controls will be a continuing Primary Operator responsibility until final stabilization is achieved. City of Coppell and JDK Associates, Inc., who will be implementing this SWPPP, must remain alert to the need to periodically refine and update this SWPPP in order to accomplish the intended goals. UPDATE FORMS LISTED BELOW ARE LOCATED IN APPENDICES F, G AND H LIST OF POTENTIAL POLLUTANTS SWPPP UPDATE FORM CHANGES IN SITE CONDITIONS RECORD STABILIZATION MEASURES RECORD OF TEMPORARY OR PERMANENT CEASED CONSTRUCTION ACTIVITIES Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. Apri12013 Page 19 of 20 Storm Water Pollution Prevention Plan "SWPPP" Brock Environmental Services, LLC. VII. PROCEDURAL REQUIREMENTS During construction, City of Coppell and JDK Associates, Inc. as well as all subcontractors must comply with the following requirements of the TCEQ TPDES Storm Water General Permit: This SWPPP must be certified by City of Coppell and JDK Associates, Inc. for the Project prior to ground disturbance. It is the Responsibility of City of Coppell and JDK Associates, Inc. to submit a copy of the Construction Site Notice to the City of Coppell prior to the start of Construction. JDK Associates, Inc. is required to keep a signed copy of this SWPPP and supporting documents on-site. In maintaining plans, all records and supporting documents should be compiled together in an orderly fashion. Federal and State regulations require permittee(s) to keep the SWPPP and all reports and documents for at least three years after the project is complete. This provision ensures that all records are available in the event the documents need to be reviewed. All subcontractors involved in any earth disturbing activities, must sign the appropriate certification statement located in Appendix A. At a minimum, this includes the excavation and grading contractors. JDK Associates, Inc. will conduct inspections of the project as described previously to assure compliance with this SWPPP. Based on inspection results, this SWPPP and BMPs may require modification by City of Coppell to assure the quality of storm water or the identified non-storm water discharges are leaving the site in compliance with the TCEQ TPDES Storm Water General Permit. All modifications must be implemented within seven calendar days after the inspection. City of Coppell must approve modifications specific to construction projects prior to implementation by JDK Associates, Inc. and/or subcontractors as required under the TCEQ TPDES Storm Water General Permit. This SWPPP may be amended at any time if it is found to inadequately address conditions of the TCEQ TPDES Storm Water General Permit or any amendments to the permit. This SWPPP along with supporting documentation must be retained for a period of three (3) years after the completion of the Project. It is recommended that each of the operator(s) maintain a copy of the SWPPP for the three-year period The SWPPP is not submitted to the TCEQ unless the Executive Director specifically requests a copy for review. However, when the Executive Director requests the SWPPP, the permittee(s) should submit it in a timely manner. In addition, when requested, permittee(s) should also submit the SWPPP to state or local sediment and erosion or storm water management agencies or to the municipal operator of the TCEQ TPDES storm water permitted municipal separate storm sewer system to which the site discharges. Entire Contents copyright©by Brock Environmental Services, LLC. All rights reserved. Reproduction in whole or part without permission is prohibited. April 2013 Page 20 of 20 VIII. Preparers Certification Name of Preparers BROCK ENVIRONMENTAL SERVICES, LLC. 5332 Rochelle Road Rockwall, Texas 75032 214-771-3900 office 214-771-3913 fax I, Jennie D. Brock, owner of Brock Environmental Services, do hereby certify that the foregoing Storm Water Pollution Prevention Plan was prepared by me, under the Terms and Conditions of the TPDES General Permit No. TXR 150000. This certification does not cover any maintenance or inspection reporting required under the permit. The information and materials which were not generated by me have been furnished to me by my clients, their employees and /or engineers in the compilation of this Plan and the attached documents. Preparer has prepared the erosion/sediment control plan in accordance with guidelines set forth by local and state authorities. "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designated to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. lam aware there are specific penalties for submitting false information, including the possibilities of fine and imprisonment for knowing violations." in ` S g ature: Mai Printed Name: Jennie D. Brock, President Company Name: Brock Environmental Services, LLC. Date: it'12 '' 3 Appendix Contractor Certification Sub Contractor Certifications SWPPP Certification: The Owner and the General Contractor(s)will need to sign this certification "This is stating that both the Owner and General Contractor agree to abide by the Storm Water Pollution Prevention Plan and the Guidelines set forth by the TCEQ and General Permit No.TXR 15000" Sub Contractor Certifications: Each subcontractor that will be disturbing soils as a part of their scope of work for this project will need to fill out and sign a subcontractor certification, ex:erosion contra/installer, utilities, trenching or boring company, dirt contractor, concrete, a%trical,, landscaping etc. It is the Responsibility of the General Contractor to ensure that the Subcontractors complete and sign the Subcontractors certifications. All signed certifications are to remain in the SWPPP throughout the duration of the project. Signatory Requirements: A duly authorized representative of each of the Operators (Primary or Secondary) must be identified and sign the following certification statement. (Separate documents may be signed if desired). 305.128(a) All reports requested by permits and other information requested by the executive director shall be signed by a person described in §305.44(a) of this title (relating to Signatories to Applications) or by a duly authorized representative of that person. A person is a duly authorized representative only if: (1) the authorization is made in writing by a person described in §305.44(a) of this title (relating to Signatories to Applications); (2) the authorization specifies either an individual or a position having responsibility for the overall operation of the regulated facility or activity or for environmental matters for the applicant, such as the position of plant manager, operator of a well or well field, environmental manager, or a position of equivalent responsibility. (A duly authorized representative may thus be either a named individual or any individual occupying a named position); and (3) the written authorization is submitted to the executive director. (b) If an authorization under this section is no longer accurate because of a change in individuals or position, a new authorization satisfying the requirements of this section must be submitted to the executive director prior to or together with any reports, information, or applications to be signed by an authorized representative. (c) Any person signing a report required by a permit shall make the certification set forth in §305.44(b) of this title (relating to Signatories to Applications). 305.44(a) All applications shall be signed as follows. (1) For a corporation, the application shall be signed by a responsible corporate officer. For purposes of this paragraph, a responsible corporate officer means a president, secretary, treasurer, or vice-president of the corporation in charge of a principal business function, or any other person who performs similar policy or decision-making functions for the corporation; or the manager of one or more manufacturing, production, or operating facilities employing more than 250 persons or having gross annual sales or expenditures exceeding $25 million (in second- quarter 1980 dollars), if authority to sign documents has been assigned or delegated to the manager in accordance with corporate procedures. Corporate procedures governing authority to sign permit or post-closure order applications may provide for assignment or delegation to applicable corporate positions rather than to specific individuals. (2) For a partnership or sole proprietorship, the application shall be signed by a general partner or the proprietor, respectively. (3) For a municipality, state, federal, or other public agency, the application shall be signed by either a principal executive officer or a ranking elected official. For purposes of this paragraph, a principal executive officer of a federal agency includes the chief executive officer of the agency, or a senior executive officer having responsibility for the overall operations of a principal geographic unit of the agency (e.g., regional administrator of the EPA). (b) A person signing an application shall make the following certification: "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." Brock Environmental Services, LL C. OPERATOR CERTIFICATION STORMWATER POLLUTION PREVENTION PLAN Project Name: Erosion Control Improvements for Andy Brown Park (East) &Alex Drive Canal Project Location: 260 East Parkway Boulevard, Coppell, Texas 75019 As an Operator, you are required to comply with the Storm Water Pollution Prevention Plan (SWPPP)for any work that you perform on-site. Any person or group who violates any condition of the SWPPP may be subject to substantial penalties. You are encouraged to advise each of your employees working on this project of the requirements of the SWPPP. "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designated to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. lam aware there are specific penalties for submitting false information, including the possibilities of fine and imprisonment for knowing violations." This certification is hereby signed in reference to the above named project: SECONDARY OPERATOR: CITY OF COPPELL EL By: Title: l,.i,c a oaf er Date: Y0 9/L3 Print Name: COQ PRIMARY OPERATOR: JDK ASSOCIATES, INC. • By � Title: 1 h es I Date: s — 5= LE Printe. ame: rxv.rs , vkr This certification is to be kept on file with the SWPPP for this project. Do not send to the TCEQ. Brock Environmental Services, LLC. SUBCONTRACTOR CERTIFICATION STORMWATER POLLUTION PREVENTION PLAN Project Name: Erosion Control Improvements for Andy Brown Park(East) &Alex Drive Canal Project Location: 260 East Parkway Boulevard, Coppell, Texas 75019 Operator(s): City of Coppell/JDK Associates, Inc. As a subcontractor, you are required to comply with the Storm Water Pollution Prevention Plan (SWPPP) for any work that you perform on-site. Any person or group who violates any condition of the SWPPP may be subject to substantial penalties or loss of contract. You are encouraged to advise each of your employees working on this project of the requirements of the SWPPP. A copy of the SWPPP is available for your review either at the office trailer or from the Project Superintendent. Each subcontractor engaged in activities at the construction site that could impact stormwater must be identified and sign the following certification statement: I certify under the penalty of law that I have read and understand the terms and conditions of the SWPPP for the above designated project and agree to follow the BMPs and practices described in the SWPPP. This certification is hereby signed in reference to the above named project: Company: Address: Telephone Number: Type of construction service to be provided: Signature: Title: Date: Brock Environmental Services, LL C. Appendix B Delegation Letter Owner's responsibility; The Owner will need to delegate the Contractor who will have day to day operational control of the construction project to ensure compliance with the SWPPP that has been developed for this site by signing the Delegation letter. Once the owner has signed the Delegation letter, make a copy of the Delegation letter on your Company Letterhead and mail to the Executive Director of the TCEQ in the envelope that has been provided. Then put a copy back in the SWPPP behind Appendix B. Contractor's responsibility; The Contractor will need to delegate the person or specifically described position as an authorized person for signing Inspection reports, storm water pollution prevention plans, certifications or other information as required. This person or position is authorized to sign reports, plans or certifications other that an NOI application. Once the Contractor has signed the Delegation letter, make a copy of the Delegation letter on your Company Letterhead and mail to the Executive Director of the TCEQ in the envelope that has been provided. Then put a copy back in the SWPPP behind Appendix B. April 11, 2013 "Executive Director" Texas Commission on Environmental Quality Storm Water and Pretreatment Team P.O. Box 13087, MC-148 Austin, Texas 78711-3087 Dear Executive Director, This letter serves to designate a Company who will have day-to-day operational controls of those activities at a construction site which are necessary to ensure compliance with the storm water pollution prevention plan that has been developed for this site. Name: JDK Associates, Inc. Title: Primary Operator/ Daily Operational Controls Project Name: Erosion Control Improvements for Andy Brown Park (East) & Alex Drive Canal Project Location: 260 East Parkway Boulevard, Coppell, Texas 75019 By signing this authorization, I confirm that I meet the following requirements to make such a designation as set forth in the Texas Administrative Code Title 30 Part 1 Chapter 305 Subchapter C Rule 305.44 and Title 30 Part 1 Chapter 305 Subchapter F Rule 305.128. "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designated to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. lam aware there are specific penalties for submitting false information, including the possibilities of fine and imprisonment for knowin violations." Signature: Date: y l `/f Printed Name: (a ?h f l [i-p Title: C,-T7 Ana?e.- Secondary Operator: City of Coppell April 11, 2013 "Executive Director" Texas Commission on Environmental Quality Storm Water and Pretreatment Team P.O. Box 13087, MC-148 Austin, Texas 78711-3087 Dear Executive Director, This letter serves to designate either a person or specifically described position as an authorized person for signing reports, storm water pollution prevention plans, certifications or other information as required. The following person or position is hereby authorized to sign reports, plans or certifications other than an NOI application. A qualified Storm Water Inspector Employed by: JDK Associates, Inc. Name: James (Steve) Kenney Title: President Project Name: Erosion Control Improvements for Andy Brown Park (East) & Alex Drive Canal Project Location: 260 East Parkway Boulevard, Coppell, Texas 75019 By signing this authorization, I confirm that I meet the following requirements to make such a designation as set forth in the Texas Administrative Code Title 30 Part 1 Chapter 305 Subchapter C Rule 305.44 and Title 30 Part 1 Chapter 305 Subchapter F Rule 305.128. "l certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designated to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. lam aware there are specific penalties for submitting false information, including the possibilities of fine and imprisonment for knowing violations" Signature: - Date: (I- 13 NIL 46 Printed Name: cs ��a Title: QvieC I oa'l T Primary Operator: JDK Associates, Inc. Appendix C TPDES Construction Site Notices Large Site Notice(Primary Operator)/Secondary Operator Site Notice Small Construction Site Notice/Small Construction Site for Low Erosion Potential Primary Operator(s) responsibility; Large Construction Site Notice-Primary Operator Notice This notice is for construction sites that are greater than 5 acres including the larger common plan of development. This notice is posted at the site along with a copy of the NOI (as applicable) by the Contractor in a readily accessible place viewable by the public. Please review the information and make sure it is correct then mail a copy to the MS4 operator in the envelope that has been provided. Secondary Operator; Secondary Operator Site Notice This notice is for Secondary Operators of construction sites equal to or greater than 5 acres. This notice must be signed by the Secondary Operator and posted at the site in a readily accessible place viewable by the public. A copy of the signed Secondary Operator Notice must be sent to the MS4 operator in the envelope that has been provided. Owner and Contractor's responsibility; Small Construction Site Notice This notice is used for Construction projects that disturb less than 5 acres. Both the Owner and Contractor must sign the notices and mail a copy to the MS4 Operator in the envelope that has been provided. These notices must be posted at the site in a readily accessible place viewable by the public. Upon completion of all construction activities and once the site has been stabilized with vegetation, a construction site notice with the dates of completion will need to be submitted to the MS4Operator as well. •11111111• -41111111111111111111 mr JIM= IMF Nii IN SMALL CONSTRUCTION SITE NOTICE FOR THE Texas Commission on Environmental Quality(TCEQ) Stormwater Program TPDES GENERAL PERMIT TXR150000 The following information is posted in compliance with Part II.E.2. of the TCEQ General Permit Number TXR150000 for discharges of stormwater runoff from small construction sites. Additional information regarding the TCEQ stormwater permit program may be found on the internet at: http://www.tceq.state.tx.us/nav/permits/wq construction.html Operator Name: City of Coppell Contact Name and Phone Number: Albert Samaniego Cell 469-576-1458 Office 972-304-3681 roject Description: Physical address or Erosion Control Improvements for description of the site's location, estimated start Andy Brown Park(East)&Alex Drive Canal date and projected end date, or date that disturbed 26o East Parkway Boulevard,Coppell,Texas 75019 soils will be stabilized Start Date:April 2013 End Date: September 2013 Location of Stormwater Pollution Prevention Plan: On Site With Project Manager For Small Construction Activities Authorized Under Part II.E.2. (Obtaining Authorization to Discharge) the following certification!must be completed: i CI v� ?A i �l Q� (Typed or Printed Name Person Completing This Certification)certify under penalty of law that I have read and understand the eligibility requirements for claiming an authorization under Part II.E.2.of TPDES General Permit TXR150000 and agree to comply with the terms of this permit. A stormwater pollution prevention plan has been developed and will be implemented prior to construction, according to permit requirements. A copy of this signed notice is supplied to the operator of the MS4 if discharges enter an MS4. I am aware there are significant penalties for providing false information or for conducting unauthorized discharges, including the possibility of fine and imprisonment for knowing violations. � C'/1 Signature and Title �! AI 4 y &r Date 4/7(9 h Date Notice Removed MS4 operator notified per Part II.F.3. -41■111111 IMF 1111111111111 I SMALL CONSTRUCTION SITE NOTICE FOR THE Texas Commission on Environmental Quality(TCEQ) Stormwater Program TPDES GENERAL PERMIT TXR150000 The following information is posted in compliance with Part II.E.2. of the TCEQ General Permit Number TXR150000 for discharges of stormwater runoff from small construction sites. Additional information regarding the TCEQ stormwater permit program may be found on the interne at: http://www.tceq.state.tx.us/nav/permits/wq construction.html Operator Name: JDK Associates,Inc. Contact Name and Phone Number: James(Steve)Kenney Cell 214-850-5704 Office 940-686-6236 _roject Description: Physical address or Erosion Control Improvements for description of the site's location, estimated start Andy Brown Park(East)&Alex Drive Canal date and projected end date, or date that disturbed 26o East Parkway Boulevard,Coppell,Texas 75019 soils will be stabilized Start Date:April 2013 End Date: September 2013 Location of Stormwater Pollution Prevention Plan: On Site With Project Manager For Small Construction Activities Authorized Under Part II.E.2. (Obtaining Authorization to Discharge) the. r following certification must be completed: I J YXtkt'S 5 • 42-14 (Typed or Printed Name Person Completing This Certification)certify under penalty of law that I have read and underttand the eligibility requirements for claiming an authorization under Part II.E.2. of TPDES General Permit TXR150000 and agree to comply with the terms of this permit. A stormwater pollution prevention plan has been developed and will be implemented prior to construction, according to permit requirements. A copy of this signed notice is supplied to the operator of the MS4 if discharges enter an MS4. I am aware there are significant penalties for providing false information or for conducting unauthorized discharges, including the possibility of fine and imprisonment for knowing violations. Signature and Title Date 13 Date Notice Removed MS4 operator notified per Part II.F.3. Appendix D NOi-Notice of Intent NOT- Notice of Termination NOC- Notice of Change These Forms are only used for projects that have 5 acres or more of disturbed area of construction-or-are part of a common plan of development; Notice of Intent Form-This form is for projects that disturb more than 5 acres or are part of a common plan of development. This form is to be signed by a Company Officerand mailed to the TCEQ and a copy mailed to the MS4 Operator that receives storm water discharge from the construction site. There is also a fee that must be paid to the TCEQ with the submission of an NOI. Notice of Termination-This form is to be filled out and sent to the TQEQ and a copy mailed to the MS4 Operator that receives storm water discharge from the construction site once the site has reached final stabilization. Notice of Change Form-This form is to be used if it is found out to be that relevant information provided in the original NOI changes. An NOC must be submitted at least 14 days before the change occurs, if possible. Where 14 day advance notice is not possible the operator must submit an NOC within 14 days of the discovery. Appendix E Endangered Species Impaired Receiving Water Bodies Listing Endangered Species This Appendix contains information on any Endangered Species and Impaired Receiving Water Bodies that may be adversely impacted by the construction project. Both the Owner (Secondary Operator) and Contractor (Primary Operator) must sign the certification statement prepared for this project. Impaired Receiving Water Bodies Impaired Receiving Waters and Total Maximum Daily Load (TMDL) Requirements to address discharges to impaired water bodies listed in accordance with Section 303(d) of the federal Clean Water Act (CWA) Endangered Species Certification Impact on The list of possible threatened and endangered species is attached. A Endangered Species review of the site found no evidence that this project will have an adverse impact on any listed threatened or endangered plant or animal species. Project Name: Erosion Control Improvements for Andy Brown Park (East) &Alex Drive Canal Project Location: 260 East Parkway Boulevard, Coppell, Texas 75019 Signature: Printed Name: Ronnie D. Brock, Vice President Company Name;prock Environmental Services, LLC. Date: /2-I 3 "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designated to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. lam aware there are specific penalties for submitting false information, including the possibilities of fine and imprisonment for knowing violations." Operator Certification Owner: CITY OF COPPELL By: L Title: C; i Aanq 9 er- Date:Y/9/3 Printed ame: Cia t ?Ji (j'INs Contractor: JDK ASSOCIATES, INC. By: Title:r)/«51 ritw Date L'lr-l.3 Printed Name: S)-4011 € . S tie vi Texas Parks&Wildlife Dept. Page 1 of 4 Annotated County Lists of Rare Species Last Revision:8/17/2011 6:19:00 PM DALLAS COUNTY BIRDS Federal Status State Status American Peregrine Falcon Falco peregrinus anatum DL T year-round resident and local breeder in west Texas, nests in tall cliff eyries; also, migrant across state from more northern breeding areas in US and Canada,winters along coast and farther south; occupies wide range of habitats during migration, including urban, concentrations along coast and barrier islands; low-altitude migrant, stopovers at leading landscape edges such as lake shores, coastlines, and barrier islands. Arctic Peregrine Falcon Falco peregrinus tundrius DL migrant throughout state from subspecies' far northern breeding range,winters along coast and farther south; occupies wide range of habitats during migration, including urban, concentrations along coast and barrier islands; low-altitude migrant, stopovers at leading landscape edges such as lake shores, coastlines, and barrier islands. Bald Eagle Haliaeetus leucocephalus DL T found primarily near rivers and large lakes; nests in tall trees or on cliffs near water; communally roosts, especially in winter;hunts live prey, scavenges, and pirates food from other birds Black-capped Vireo Vireo atricapilla LE E oak juniper woodlands with distinctive patchy, two-layered aspect; shrub and tree layer with open, grassy spaces; requires foliage reaching to ground level for nesting cover; return to same territory,or one nearby, year after year; deciduous and broad-leaved shrubs and trees provide insects for feeding; species composition less important than presence of adequate broad-leaved shrubs, foliage to ground level, and required structure; nesting season March-late summer Golden-cheeked Warbler Setophaga chrysoparia LE E juniper-oak woodlands; dependent on Ashe juniper(also known as cedar) for long fine bark strips, only available from mature trees, used in nest construction; nests are placed in various trees other than Ashe juniper; only a few mature junipers or nearby cedar brakes can provide the necessary nest material; forage for insects in broad-leaved trees and shrubs; nesting late March-early summer Henslow's Sparrow Ammodramus henslowii wintering individuals (not flocks) found in weedy fields or cut-over areas where lots of bunch grasses occur along with vines and brambles; a key component is bare ground for running/walking Interior Least Tern Sterna antillarum athalassos LE E subspecies is listed only when inland (more than 50 miles from a coastline); nests along sand and gravel bars within braided streams,rivers; also know to nest on man-made structures (inland beaches, wastewater treatment plants, gravel mines, etc); eats small fish and crustaceans, when breeding forages within a few hundred feet of colony Peregrine Falcon Falco peregrinus DL T Texas Parks&Wildlife Dept. Page 2 of 4 Annotated County Lists of Rare Species DALLAS COUNTY BIRDS Federal Status State Status both subspecies migrate across the state from more northern breeding areas in US and Canada to winter along coast and farther south; subspecies (F. p. anatum) is also a resident breeder in west Texas; the two subspecies' listing statuses differ, F.p. tundrius is no longer listed in Texas;but because the subspecies are not easily distinguishable at a distance, reference is generally made only to the species level; see subspecies for habitat. Piping Plover Charadrius melodus LT T wintering migrant along the Texas Gulf Coast; beaches and bayside mud or salt flats Sprague's Pipit Anthus spragueii C only in Texas during migration and winter, mid September to early April; short to medium distance, diurnal migrant; strongly tied to native upland prairie, can be locally common in coastal grasslands, uncommon to rare further west; sensitive to patch size and avoids edges. Western Burrowing Owl Athene cunicularia hypugaea open grasslands, especially prairie,plains, and savanna, sometimes in open areas such as vacant lots near human habitation or airports;nests and roosts in abandoned burrows White-faced Ibis Plegadis chihi T prefers freshwater marshes, sloughs, and irrigated rice fields,but will attend brackish and saltwater habitats; nests in marshes, in low trees, on the ground in bulrushes or reeds, or on floating mats Whooping Crane Grus americana LE E potential migrant via plains throughout most of state to coast; winters in coastal marshes of Aransas, Calhoun, and Refugio counties Wood Stork Mycteria americana T forages in prairie ponds, flooded pastures or fields, ditches, and other shallow standing water, including salt- water; usually roosts communally in tall snags, sometimes in association with other wading birds(i.e. active heronries); breeds in Mexico and birds move into Gulf States in search of mud flats and other wetlands, even those associated with forested areas; formerly nested in Texas, but no breeding records since 1960 INSECTS Federal Status State Status Black Lordithon rove beetle Lordithon niger historically known from Texas MAMMALS Federal Status State Status Cave myotis bat Myotis velifer colonial and cave-dwelling; also roosts in rock crevices, old buildings,carports, under bridges, and even in abandoned Cliff Swallow (Hirundo pyrrhonota) nests;roosts in clusters of up to thousands of individuals; hibernates in limestone caves of Edwards Plateau and gypsum cave of Panhandle during winter; opportunistic insectivore Texas Parks&Wildlife Dept. Page 3 of 4 Annotated County Lists of Rare Species DALLAS COUNTY MAMMALS Federal Status State Status Plains spotted skunk Spilogale putorius interrupta catholic; open fields,prairies, croplands, fence rows, farmyards, forest edges, and woodlands; prefers wooded,brushy areas and tallgrass prairie MOLLUSKS Federal Status State Status Fawnsfoot Truncilla donaciformis small and large rivers especially on sand, mud, rocky mud, and sand and gravel, also silt and cobble bottoms in still to swiftly flowing waters; Red(historic),Cypress(historic), Sabine(historic),Neches,Trinity, and San Jacinto River basins. Little spectaclecase Villosa lienosa creeks,rivers, and reservoirs, sandy substrates in slight to moderate current, usually along the banks in slower currents; east Texas, Cypress through San Jacinto River basins Louisiana pigtoe Pleurobema riddellii T streams and moderate-size rivers, usually flowing water on substrates of mud, sand, and gravel;not generally known from impoundments; Sabine,Neches, and Trinity(historic) River basins Texas heelsplitter Potamilus amphichaenus T quiet waters in mud or sand and also in reservoirs. Sabine,Neches, and Trinity River basins Wabash pigtoe Fusconaia flava creeks to large rivers on mud, sand, and gravel from all habitats except deep shifting sands; found in moderate to swift current velocities; east Texas River basins, Red through San Jacinto River basins; elsewhere occurs in reservoirs and lakes with no flow REPTILES Federal Status State Status Alligator snapping turtle Macrochelys temminckii T perennial water bodies; deep water of rivers, canals, lakes, and oxbows; also swamps, bayous, and ponds near deep running water; sometimes enters brackish coastal waters; usually in water with mud bottom and abundant aquatic vegetation; may migrate several miles along rivers; active March-October; breeds April- October Texas garter snake Thamnophis sirtalis annectens wet or moist microhabitats are conducive to the species occurrence,but is not necessarily restricted to them; hibernates underground or in or under surface cover;breeds March-August Texas horned lizard Phrynosoma cornutum T open, arid and semi-arid regions with sparse vegetation, including grass, cactus, scattered brush or scrubby trees; soil may vary in texture from sandy to rocky; burrows into soil, enters rodent burrows, or hides under rock when inactive; breeds March-September Texas Parks&Wildlife Dept. Page 4 of 4 Annotated County Lists of Rare Species DALLAS COUNTY REPTILES Federal Status State Status Timber/Canebrake Crotalus horridus T rattlesnake swamps, floodplains, upland pine and deciduous woodlands, riparian zones, abandoned farmland; limestone bluffs, sandy soil or black clay;prefers dense ground cover, i.e. grapevines or palmetto PLANTS Federal Status State Status Glen Rose yucca Yucca necopina Texas endemic; grasslands on sandy soils and limestone outcrops; flowering April-June Warnock's coral-root Hexalectris warnockii in leaf litter and humus in oak juniper woodlands on shaded slopes and intermittent,rocky creekbeds in canyons; in the Trans Pecos in oak-pinyon-juniper woodlands in higher mesic canyons (to 2000 m[6550 ft]),primarily on igneous substrates; in Terrell County under Quercus fusiformis mottes on ten-races of spring-fed perennial streams, draining an otherwise rather xeric limestone landscape; on the Callahan Divide (Taylor County),the White Rock Escarpment(Dallas County), and the Edwards Plateau in oak juniper woodlands on limestone slopes; in Gillespie County on igneous substrates of the Llano Uplift; flowering June-September; individual plants do not usually bloom in successive years Waterbody Search I WATERS I US EPA Page 1 of 1 ; oars http://iaspub.epa.gov/tmdl/attains index.search_wb?p_area=TX&p_cycle=2010 Last updated on Friday,April 05, 2013 Watershed Assessment, Tracking & Environmental ResultS You are here: EPA Home Water WATERS Water Quality Assessment and TMDL Information Waterbody Search Y,,,oiwitei Waterbodies matching search criteria: Area equals "TX" and waterbody name contains "Denton Creek" Description of this table NOTE: Click on the underlined "Waterbody Name" to view the waterbody report. Most Waterbodv Waterbodv Current Waterbody State TMDL Location Map Size Unit Status Development Name ID Data Type Status Available Denton TX- 2010 Entire Data Stream 11.1 Miles Good Creek 0825_01 Segment Unavailable Denton Lower 7.9 Creek TX 2010 Miles Of Data Stream 12.0 Miles Good (Unclassified 0826A_01 Creek Unavailable Water Body 15.7 Miles Denton Upstream Creek TX- 2010 To 7.4 Miles Data Stream 23.5 Miles Good (Unclassified 0826A_02 Down Unavailable Water Body) Stream Of Fm 156 9.3 Miles Upstream Denton To 15.7 Creek TX- 2010 Miles Data Stream 28.5 Miles Not_Assessed (Unclassified 0826A_03 Downstream Unavailable Water Body) Of Greenwood Rd. Denton Creek TX- Upper 20.8 Data (Unclassified 0826A_04 2010 Miles Of Unavailable Stream 22.0 Miles Not_Assessed Water Body). Creek Denton Creek TX- 2010 Entire Data (Unclassified 1803F_01 Segment. Unavailable Stream 15.5 Miles Impaired TMDL needed Water Body] http://iaspub.epa.gov/tmdl/attains_index.search_wb?p_area=TX&p_cyc1e=2010 4/5/2013 Appendix F List of Potential Pollutants This Appendix contains your List of Potential Pollutants Form List of Potential Pollutants This form is to be used to show all construction materials that will be used and activities that will be performed that have potential to contribute pollutants, including sediments, to storm water run off. This list must be filled out and kept updated as part of your SWPPP = = a � § ■ . c \ m 4.4 � » 4:1;_� : f2.0 . 4 / �o / o 6.o -1 © � o rk « Cl) § o � \ . � a k . � k Description of Potential Pollutant Sources Narrative Description: w C7 o• w r 4-, ..' co C) co 0 O r o c) CI) L =i 0 C) O 0 — to d • J oa r.. O - w N O co G. C> O U c 0) ITS cjz Q Q w C) c au) C) Q C l3 V C) 2 :0 Q Q) Appendix G SWPPP Update Form Record of Major Grading Activities Changes in Site Conditions SWPPP Update Form; This form is to be used when there is a change in design, construction, operation, or maintenance that has a significant effect on the discharge of pollutants that has not been previously addressed in the SWPPP. (Examples would be if there were additions of extra Erosion Control Devices or the deletion of unnecessary Erosion Control Devices.) Also note that the form asks you if the Erosion Map was updated, it is necessary to update your Erosion Map when there are changes in design or maintenance to the controls used on site. Record of Major Grading; This Form is to be used to log the dates when any grading activities take place on the project. You log the date and location of the activity as well as describe the grading activity on site. (Example; Started grading parking area 1, Started grading for west bound roadway section, clearing brush to begin grading for new ground storage tank.) Changes in Site Conditions; This Form is to be used when there is an update to the plans and specifications, the addition of new operators, new areas of responsibility, and changes in BMPs. RECORD OF." MAJOR GRADING ACTIVITIES Note: Table is used to log dates when any grading activities take place on the project. ....... ............. Date(s) When Mai° Grading Describe Major Grading Activity and Location Activities Occur (mm-dd-yy) CHANGES IN EXISTING SITE CONDITIONS: Date(e)when Changes Occur Describe Changes in Existing Site Conditions (mm-dd-yy) Appendix H Record Temporary or Permanent Ceased Construction Activities Record of Stabilization Measures Record of Temporary or Permanent Ceased Construction Activities; This form is to be used to log the dates when Construction Activity either temporarily or permanently ceases at the site. You log the Project Activity area, the date Activities ceased, whether it is temporary or permanent and the date that Activities resume at the site. Record of Stabilization Measures; This form is used to log the dates that each area of your project is stabilized. You log the date, describe the Stabilization measures used and log the area of the project that has been stabilized. Appendix I Project Description Surface Water Map Vicinity Map Erosion and Sediment Control Plan with Drainage Characteristics, Details and Specifications This Appendix contains the following; Project description-This is a narrative that basically describes what type of construction activity is involved with the construction project. Surface Water Map-Aerial Map showing nearby surface water Vicinity Map-This is an area map showing the location of the project. Erosion and Sediment Control Plan with Drainage Characteristics, Details and specifications-The ECP shows the location of structural controls used to prevent sediment run-off from the project as well as the flow of storm water, details and specifications for the types of controls selected. Project Description This Storm Water Pollution Prevention Plan (SWP3) has been prepared for the proposed construction for; Andy Brown Park & Alex Drive Canal located at 260 East Parkway Boulevard, in the City of Coppell, Dallas County Texas. This project consists of constructing erosion control repairs and improvements. The project lies in and near Andy Brown Park East, and includes lake edge treatment around the central activity lake, both sides of the canal north of Parkway Boulevard, and 700 linear feet of the east bank south of Parkway Boulevard. This project will include unclassified channel excavation, the construction of new retaining wall, the installation of geosynthetic soil stabilization, the installation and/or adjustment of related drainage facilities, and all related appurtenances. Construction activities included in this project are: installation of erosion controls, clearing and grading, excavation and embankment, stockpiling and removal, construction of stone wall, rock rip rap and all related appurtenances, paving for trail replacement, adjustments to drainage facilities, backfilling operations and final grading and landscaping for final stabilization. JDK Associates, Inc. is responsible for: Updating the SWP3 Plan and Erosion Map as the project proceeds to show; contractors staging areas including all equipment and material storage areas, any offsite materials, waste, borrow or equipment storage areas and all areas of final stabilization once each section has been completed. Erosion Control Phasing Phase 1 A. Install erosion controls (as shown on erosion control map) and mobilize staging area. B. Begin clearing and grading site, C. Begin excavation and embankment D. Stockpiling and removal Phase II A. Keep all erosion control measures in place B. Construction of stone wall, rock rip rap and all related appurtenances C. Geosynthetic soil stabilization D. Adjustments to drainage facilities E. Paving for trail replacement F. Final grading Phase Ill A. Keep all erosion control measures in place B. Re-vegetate lots, parkways and all disturbed areas C. Remove all Equipment and Materials D. Once project has reached 70% stabilization, remove all erosion control devices. r r ,. : , „...4 1 .Z.11, "'w, . ,, f wig a /` �y a ,I ., n - w, ' _ . s,S t 1'71, : I .� a r xw , ' -. 4 # ilijill D .91toil ' r 110... q� At 5 Y 4e -0, prok ' . ,, 4* ., _i r ,14,,,„, „„: :— , ' — : 0 � i� A� » �" ''' ' - f i YY * sum l'clir -,. , `®Wr 4 , ,� 1 YA7 A, L., \ tr lit ' ' , ,,,,,,,. ,,,,,g, RECEIVING WATER IS DENTON CREEK Project Name: ,❖:❖:❖:❖:❖:❖❖❖❖:❖:❖:❖❖❖:❖:❖: Erosion Control Improvements for BROCK ENVIRONMENTAL Andy Brown Park (East) & SERVICES, LLC. Surface Waters °i Alex Drive Canal �°'�`# Date: e• 5332 Rochelle Road i•:4 :0 ROCKWALL,TEXAS 75032 pi 4/5/2013 Project Location: 3: 214-771-3900 C o p p e l I, Texas .:.;.;.;.;.:.:.:.:.;.:.;.;.:.;.;. Page# 1 1 N EROSION CONTROL IMPROVEMENTS :-.. .. FOR in co J a ANDY BROWN PARK & ALEX DRIVE CANAL U CITY OF COPPELL, TEXAS U, x PROJECT NO: MA10-09 W T tl @ C I T Y O Ir 0. COPPELL O U �� , PROJECT LOCATIONS g r.� * T , . =--". '' ^.F.. 9 O COUNTY o a La!� J AIM --��1,-77::,147"..e, „, SHEET INDEX MAYOR , o `> ,L ..t ,� tnp KAREN HUNT =kN2Y LAK 1 €V — COVER �►„al 1 • 1I ” , r 1 GENERAL NOTES/PROJECT LAYOUT E MAYOR PRO TEM r-.1 2 UNIT Al — LAKE PLAN (1 OF 3) x 1 * ct g 6 '11 3 UNIT Al — LAKE PLAN (2 OF 3) Q TIM BRANCHEAU 1 'n I10, ":V-C', ,� ,erg.. 4 UNIT Al — LAKE PLAN (3 OF 3) �3 CITY MANAGER l __ '�?:, v' 5 UNIT A2 — CANAL WALL PLAN 1r ,a - Y � '� 6 UNIT B — CANAL WALL PLAN a CLAY PHILLIPS I 7 MISCELLANEAOUS DETAILS i DIRECTOR OF PUBLIC WORKS 8 BLOCK WALL DETAILS (1 OF 2) & F 9 BLOCK WALL DETAILS (2 OF 2) m KENNETH GRIFFIN, P.E. c z DIRECTOR OF PARKS AND RECREATION BRAD REID I. 0, LOCATION MAP z CITY COUNCIL W X BOB MAHALIK BILLY FAUGHT W ' ar: WES MAYS MARVIN FRANKLIN a x GARY RODEN AARON DUNCAN 2013 _. PRESIDENT OF COPPELL RECREATION € %% } DEVELOPMENT CORPORATION teague nail & perkins ': 1100 Macon Street % KYLE d DYKES ) O GREG GARCIA Fort Worth,Texas 76102 ��.yp�� 99378 �. y%s p.E. 0 ¢ /COI f icgt116S"lci� CZ dam 817.336.5773 ph 817.336.2813 ix 1 �� 73 TBPE Registration No.F-230 Il SNAL�� Date: W `> www.tnpinc.com C- S m Aft 2 1.‘1.-': PROJECT LOCATION: ` ;.. .' Q , .w 260 E. Parkway Drive 1z, �' Coppell, Texas• q�r < �� ` �' CONTRACTOR STAGING AREA +tea . ik -'- �t� - ... _ } I Y - « PROJECT LOCATION I,..Crit};s - t �� :. `"4,1F.1 ." `x • ":c :« - s k. d�fnr?<yn,Di - ..,�. ,�, '.' 't.x' ;•-'•p•''X" t yi':' •��,�. . 41 < . . .'" `.:: Parkv'e+ Pl --x"`° Z` $ -a .DUnc I ` r '''4," 'L^,i`� �� :.. .;, 2,t 3 C°n i {ungty fiat 1 1 g , ° Tt� s ' »rh ir'1 . x -4 • kYteO ,��°b` 3 �- a.> + . .L r� �,q '?' r' > _ _ Z ' ` : Sfldv�y . '< --,':,.Ale.Dr i fe ,MS ? x 44( < r IT .�„` Wa % - - .. `- n .,` v`0 �r Illi '.fT(a'a spy. - r•��!•1''�-r, a.^�. = - l 'i_taogwQ°�Yc�II �: Lie- , [' LVr kYiik�tlLll�' ' te r? .- m Pfl 4.x t 4 d + : ti MI �. 4 J p � -- Pecan Efollua Dr ab ^ - =. k`"..-., - • • - - Z ii. �.:Qar-valCY.D� „e • ,.. .. p, ,. a . t . ) -_, I. 4 �° :: , ' �,.d PORT O LET 0 ■ it riirtl SEDIMENT LOGS WILL BE ,.....-.0.-.7. *, = ='_ ♦ "°1,4-.. • USED AROUND STOCKPILES 0-4,4.::—:-:•417' :N "' = , = ... .�_ CONSTRUCTION - ON THE DOWNSTREAM : .-.: rte . i - rk: r . � .�. , >. • ::.-.::... ENTRANCE "-Aic`... SIDE f r,. .R'•^ ... � : " Z "i. � YFT-C �ihkxnro "eta t < � .R £c^a : r � �.i +% � � I � �. r :. ':�':: ,.. .: �Ir /N ...... *I� : newlV� x ,.: � s'►3'�6'i• •'�r�'•R'�' Q2a',5 .'ICE 1/ ti:Y *i CONCRETE .; ;�x ►d 3i�:it.WILLIR . ,� :� 71 WASHOUT €i. :: ,: 0�...... R TA ' B OCK ENVIRONMEN L y' '�` 'ca (G ' SERVICES, LLC ?�: t(j.— VV. 6 5332 ROCHELLE ROAD y : ;." "� ROC WALL,TEXAS 75032 •$ �.... W} K 7 �� " Y: 4: l 4•.':..: 214-771-3900 .■ _ o. w ,, :>::.: - . :z: "«" a : a �.4 4 } :. >- $-: it:ar.""}:mss.* ;n ,:'1::": ` .+ •i M• �-iw'i •:, w �'..'. ...t�. •��ii� P�QgQ��•��8�•ia��4 O �^ AAA'.':::.:1: ��yw... ..�•dLd: : •JEJ•d1 JLAE.•A•df�L•��•:.J�.•AA. rfi w �•�i",F.w :'S'. l•'i: se A'w aWSi' • w� • • L Mir,•,,,., :, wi ti ..�--7.4; ,'�. *.'.'..rn-1-:-4 E r. t . ,,1° «.r R'' � Erosion Control Plan Legend �, »' ' Pojectu Date �► WATER FLOW t,„,„,',..,4,- , .„,4 ', t '". - __,s"»,'. ; ti --a....t„ 4-4-2013 3i..11.r CONSTRUCTION .�:: '. 9r,+ s ,.:.s• r Page# 1 �• �` ENTRANCE - - r °,'x'1F' "'� .F:r•:z. CONTRACTOR STAGING AREA PROJECT LOCATION: 260 E. Parkway Drive {�- .{ ``'�. "r , .� ,..:1„ 1 '24.--. -,..: h Coppell, Texas Ew• 3, 'd - Q, .. - CONCRETE ,:';;;:," : ( , ''! ,,„1.7.•• WASHOUT :':«.• xe Y ': "[t" ,'F... �� ,�•�;.�.:. .g;,�:. � '.;iF,.. �i• ,..L"..__ V. ' �-,,, .r- TA'Y'�:•.�1 ,: 1•, .r.t�n`•:.-:i `:„oz,c, ^«"• ::. .:kx :.. ::?iii: "t ri` �.s -.aF:4 : . h ..7� m�.` 1G� rte^ � J� lhillr: ^:!.��.r Z Y •'• t` .4 1,: 'u' ?fir`_„ �ice*x �"' ''-114 ,.,.•+ a-r C S°' SEDIMENT LOGS WILL BE ~". � '' '_ �x �:� USED AROUND STOCKPILES '` +'r' ON THE DOWNSTREAM �, :x ° ; : ? xr.: ; ' illipit V . '�' `, •• SIDE .` ^ '� *� W '''''''',1-1':: ,711,. x tit;' . > 5T .. e x T 0 . � yy '!• �' ` Z4�k• r 4,111b k„r PORT O LET {�i,i 9' Q CONSTRUCTION ? • "" :k�F ,TiS : 4 .. ENTRANCE m '�: �;� . 4 a a l x x le !ki ' - * t {_ "}wit ..” +, " Uml rr`' ,. cc v; ,° t. ". CONCRETE y• * " WASHOUT Z «t, S�a-n • 1/14 44.: 4•4 II.- '' �k - .x. s '' i�S'i1w tee:». � t- H .rx« ��1tw®�.91.!".91 !.Awfw.wwwLf?? '�wti'.•w'�•Y'd '' '. 44 5 :y `yd CAI: MI * r ' ^ t:: i*� '•%� *+�l „ _ ». +":. _ BROCK ENV/RONMENTAL / q . ` . ..,� 'C� SERVICES, L L C :�:� / * •: Appendix J Inspector Qualifications and Inspection Reports Rain Event Log This Appendix contains information about the qualifications of the persons delegated to perform the mandatory Inspections for this project and copies of the site specific Inspection Report forms to be used for this project. If you are performing your own Inspections, you will need to fill out the Inspector Qualifications form. Storm Water Pollution Prevention Plan Inspector Qualifications toi lipl e let £ tli e & �',it of ;Ae. ire,b rtr rikivort. 7 43 € t sos: y :r„ilArft#7.1--. i 'Tiff,; 0,11 014 i okii is €g cg s !AIL* , � € 'l 2 11 14 Inspectors Name James(Steve) Kenney Title President Training Received Training Covered Construction Experience 20 Years Experience- NCMA Level II Segmental Retaining Wall Installer Storm Water Construction Inspection Experience STORM WATER POLLUTION PREVENTION PLAN INSPECTION REPORT PROJECT NAME: Erosion Control Improvements for Andy Brown Park(East)&Alex Drive Canal EJECT LOCATION: 260 East Parkway Boulevard,Coppell, Texas 75019 CONTRACTOR: JDK Associates, Inc. DATE OF INSPECTION INSPECTION CONDUCTED BY: James(Steve) Kenney QUALIFICATIONS OF INSPECTOR: See SWPPP TYPE OF INSPECTION: (circle one) 14 Day 7 Day Rain Event Inspection: In Conformance Effective Pollutant Control Practice Y N NA Yes / No Construction Entrance Yes / No Silt Fence Yes / No Curb Inlet Protection Yes / No Soil Stabilization Yes / No Solid Waste Disposal Yes / No Sanitary/Septic Yes / No Equipment Fueling/Storage __ Yes / No Other Controls/ Yes / No Site Requirements: Y N NA Comments Are TPDES permits,for all permittees posted at the construction entrance? Is contact information for all permittees posted at the construction entrance? Are copies of the inspection reports included with the SWPPP? If BMP's have been modified, has the SWPPP modified? Are there any signs of discharge leaving the site? Are all BMP's functioning as intended? Any Additional BMP's Required? NOTE:All items of non compliance shall be repaired/installed within(7)days of inspection. Repairs/Installation shall be completed immediately,if storm conditions are imminent. VIOLATIONS NOTED: COMMENTS: "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system or those persons directly responsible for gathering information,the information submitted is,to the best of my knowledge and belief,true,accurate,and complete.l am aware that there are significant penalties for submitting false information,including the possibility of fine and imprisonment for knowing violations. ature: Date: Printed Name: Title: Inspector Appendix K Best Management Practices Effluent Limitations and Guide lines Best Management Practices This Appendix contains a copy of the 2010 iSWM Technical Manual. In this Appendix you will find information on how to properly install and maintain the various controls selected for this project. Effluent Limitations and Guide lines Effluent Limitations guidelines for regulated construction sites based on the federal Effluent Limitation Guidelines (ELGs) at 40 CFR 450.21, 450.23, and 450.24, which consists of a series of Best Management Practices. Effluent Limitations and Guidelines Except as provided in 40 CFR §§125.30-125.32, any discharge regulated under this general permit, with the exception of sites that obtained waivers based on low rainfall erosivity, must achieve, at a minimum, the following effluent limitations representing the degree of effluent reduction attainable by application of the best practicable control technology currently available (BPT). Erosion and sediment controls. Design, install, and maintain effective erosion controls and sediment controls to minimize the discharge of pollutants. At a minimum, such controls must be designed, installed, and maintained to: (a) Control stormwater volume and velocity within the site to minimize soil erosion; (b) If any stormwater flow will be channelized at the site, stormwater controls must be designed to control both peak flowrates and total stormwater volume to minimize erosion at outlets and to minimize downstream channel and streambank erosion; (c) Minimize the amount of soil exposed during construction activity; (d) Minimize the disturbance of steep slopes; (e) Minimize sediment discharges from the site. The design, installation, and maintenance of erosion and sediment controls must address factors such as the amount, frequency, intensity and duration of precipitation, the nature of resulting stormwater runoff, and soil characteristics, including the range of soil particle sizes expected to be present on the site; (f) If earth disturbance activities are located in close proximity to a surface water, provide and maintain appropriate natural buffers if feasible and as necessary, around surface waters, depending on site-specific topography, sensitivity, and proximity to water bodies. Direct stormwater to vegetated areas to increase sediment removal and maximize stormwater infiltration. If providing buffers is infeasible, the permittee shall document the reason that natural buffers are not feasible, and shall implement additional erosion and sediment controls to reduce sediment load; (g) Preserve native topsoil at the site, unless infeasible; and (h) Minimize soil compaction in post-construction pervious areas. In areas of the construction site where final vegetative stabilization will occur or where infiltration practices will be installed, either: (1) restrict vehicle and equipment use to avoid soil compaction; or (2) prior to seeding or planting areas of exposed soil that have been compacted,use techniques that condition the soils to support vegetative growth, if necessary and feasible; TCEQ does not consider stormwater control features (e.g., stormwater conveyance channels, storm drain inlets, sediment basins) to constitute "surface waters"for the purposes of triggering the buffer requirement in Part III.G.(f) above. Soil stabilization. Stabilization of disturbed areas must, at a minimum, be initiated immediately whenever any clearing, grading, excavating, or other earth disturbing activities have permanently ceased on any portion of the site, or temporarily ceased on any portion of the site and will not resume for a period exceeding 14 calendar days. In the context of this requirement, "immediately" means as soon as practicable, but no later than the end of the next work day, following the day when the earth disturbing activities have temporarily or permanently ceased. Temporary stabilization must be completed no more than 14 calendar days after initiation of soil stabilization measures, and final stabilization must be achieved prior to termination of permit coverage. In arid, semi-arid, and drought-stricken areas where initiating vegetative stabilization measures immediately is infeasible, alternative non-vegetative stabilization measures must be employed as soon as practicable. Dewatering Discharges from dewatering activities, including discharges from dewatering of trenches and excavations, are prohibited, unless managed by appropriate controls. Pollution prevention measures Design, install, implement, and maintain effective pollution prevention measures to minimize the discharge of pollutants. At a minimum, such measures must be designed, installed, implemented, and maintained to: (a) Minimize the discharge of pollutants from equipment and vehicle washing, wheel wash water, and other wash waters. Wash waters must be treated in a sediment basin or alternative control that provides equivalent or better treatment prior to discharge; (b) Minimize the exposure of building materials, building products, construction wastes, trash, landscape materials, fertilizers, pesticides, herbicides, detergents, sanitary waste, and other materials present on the site to precipitation and to stormwater; and (c) Minimize the discharge of pollutants from spills and leaks, and implement chemical spill and leak prevention and response procedures. Prohibited discharges. The following discharges are prohibited: (a) Wastewater from wash out of concrete trucks, unless managed by an appropriate control (see Part V of the general permit); (b) Wastewater from wash out and cleanout of stucco, paint, form release oils, curing compounds and other construction materials; (c) Fuels, oils, or other pollutants used in vehicle and equipment operation and maintenance; and (d) Soaps or solvents used in vehicle and equipment washing. Surface outlets When discharging from basins and impoundments, utilize outlet structures that withdraw water from the surface, unless infeasible. Construction General Permit (CGP) G.1 Sites That Are Required to Comply with Part 2.1.2.1 The purpose of this part is to help you determine if the requirements in Part 2.1.2.1 apply to your site. G.1.1 Step 1 - Determine if Your Site is Within 50 Feet of a Surface Water Part 2.1.2.1 applies to you only if your earth-disturbing activities will occur within 50 feet of a surface water that receives stormwater discharges from your site. Figure G— 1 illustrates when a site would be required to comply with the requirements in Part 2.1.2.1 due to their proximity to a surface water. If the surface water is not located within 50 feet of the earth-disturbing activities, Part 2.1.2.1 does not apply. Figure G - 1. Example of earth-disturbing activities within 50 feet of a surface water. Area of } Su rface Water Earth Disturbance t ,,. } for Buffer 30 k ► Oft f- • -rF/, rr,. ♦1 µms. 3 If you determine that your earth-disturbing activities will occur within 50 feet of a surface water that receives stormwater discharges from your site, the requirements in Part 2.1.2.1 apply, except for certain circumstances that are described in Step 2. Note that where some natural buffer exists but portions of the area within 50 feet of the surface water are occupied by preexisting development disturbances, or if a portion of area within 50 feet of the surface water is owned by another party and is not under your control, the buffer requirements in Part 2.1.2.1 still apply, but with some allowances. G-2 of 24 Construction General Permit (CGP) Clarity about how to implement the compliance alternatives for these situations is provided in G.2.1.2 and G.2.2.2 below. Note that EPA does not consider designed stormwater control features (e.g., stormwater conveyance channels, storm drain inlets, stormwater basins) that direct storm water to surface waters more than 50 feet from the disturbance to constitute surface waters for the purposes of determining if the buffer requirements apply. G.1.2 Step 2 - Determine if Any Exceptions to the Requirements in Part 2.1.2.1 Apply The following exceptions apply to the requirements in Part 2.1.2.1: • If there is no discharge of stormwater to surface waters through the area between the disturbed portions of the site and any surface waters located within 50 feet of your site,you are not required to comply with the requirements in this Part.This includes situations where you have implemented controls measures, such as a berm or other barrier, that will prevent such discharges. • Where no natural buffer exists due to preexisting development disturbances (e.g., structures, impervious surfaces) that occurred prior to the initiation of planning for the current development of the site,you are not required to comply with the requirements in this Part. Where some natural buffer exists but portions of the area within 50 feet of the surface water are occupied by preexisting development disturbances, you are required to comply with the requirements in this Part. For the purposes of calculating the sediment load reduction for either compliance alternative 2 or 3 below,you are not expected to compensate for the reduction in buffer function that would have resulted from the area covered by these preexisting disturbances. Clarity about how to implement the compliance alternatives for these situations is provided in G.2.1.2 and G.2.2.2 below. If during your project,you will disturb any portion of these preexisting disturbances, the area removed will be deducted from the area treated as natural buffer. • For"linear construction projects" (see Appendix A), you are not required to comply with this requirement if site constraints (e.g., limited right-of-way) prevent you from complying with the requirements of the alternatives in Part 2.1.2.1a, provided that, to the extent practicable,you limit disturbances within 50 feet of the surface water and/or you provide supplemental erosion and sediment controls to treat stormwater discharges from earth disturbances within 50 feet of the surface water.You must also document in your SWPPP your rationale for why it is infeasible for you to comply with the requirements in Part 2.1.2.1 a, and describe any buffer width retained and/or supplemental erosion and sediment controls installed. • For"small residential lot" construction (i.e., a lot being developed for residential purposes that will disturb less than 1 acre of land, but is part of a larger residential project that will ultimately disturb greater than or equal to 1 acre), you have the option of complying with the requirements in Part G.2.3 of this appendix. • The following disturbances within 50 feet of a surface water are exempt from the requirements in this Part: - Construction approved under a CWA Section 404 permit; or G-3 of 24 Construction General Permit (CGP) - Construction of a water-dependent structure or water access areas (e.g., pier, boat ramp, trail). Note that you must document in your SWPPP if any disturbances related to any of the above exceptions occurs within the buffer area on your site. G.2 COMPLIANCE ALTERNATIVES GUIDANCE If in Part G.1 of this guidance you determine that the buffer requirements apply to your site, you have three compliance alternatives from which you can choose: 1. Provide and maintain a 50-foot buffer undisturbed natural buffer (Part 2.1.2.1 a.i);1 or 2. Provide and maintain an undisturbed natural buffer that is less than 50 feet and is supplemented by additional erosion and sediment controls,which in combination achieves the sediment load reduction equivalent to a 50-foot undisturbed natural buffer (Part 2.1.2.10.11);' or 3. If it is infeasible to provide and maintain an undisturbed natural buffer of any size, you must implement erosion and sediment controls that achieve the sediment load reduction equivalent to a 50-foot undisturbed natural buffer (Part 2.1.2.1 a.iii).' The compliance alternative selected above must be maintained throughout the duration of permit coverage. The following provides detailed guidance for how you can comply with each of the compliance alternatives. Part G.2.1 below provides guidance on how to provide and maintain natural buffers consistent with the alternatives 1 and 2, above. Part G.2.2 below provides guidance on how to comply with the requirement to provide a 50-foot buffer equivalent through erosion and sediment controls consistent with alternatives 2 and 3, above. G.2.1 Guidance for Providing and Maintaining Natural Buffers The following guidance is intended to assist you in complying with the requirements to provide and maintain a natural buffer during construction. This part of the guidance applies to you if you choose either alternative 1 (50-foot buffer) or alternative 2 (a buffer of<50 feet supplemented by additional erosion and sediment controls that achieve the equivalent sediment load reduction as the 50-foot buffer), or if you are providing a buffer in compliance with one of the small residential lot compliance alternatives in Part G.2.3 below. 1 For the compliance alternatives in I and 2,you are not required to enhance the quality of the vegetation that already exists in the buffer,or provide vegetation if none exists(e.g., arid and semi-arid areas). You only need to retain and protect from disturbance the natural buffer that existed prior to the commencement of construction. Any preexisting structures or impervious surfaces are allowed in the natural buffer provided you retain and protect from disturbance the natural buffer area outside the preexisting disturbance. Similarly, for alternatives 2 and 3, you are required to implement and maintain sediment controls that achieve the sediment load reduction equivalent to the undisturbed natural buffer that existed on the site prior to the commencement of construction. In determining equivalent sediment load reductions, you may consider naturally non-vegetated areas and prior disturbances. See Part G.2.2 of this Appendix for a discussion of how to determine equivalent reductions. G-4 of 24 Construction General Permit (CGP) G.2.1.1 Buffer Width Measurement Where you are retaining a buffer of any size,the buffer should be measured perpendicularly from any of the following points,whichever is further landward from the water: 1. The ordinary high water mark of the water body, defined as the line on the shore established by fluctuations of water and indicated by physical characteristics such as a clear, natural line impressed on the bank,shelving, changes in the character of soil, destruction of terrestrial vegetation, and/or the presence of litter and debris; or 2. The edge of the stream or river bank, bluff, or cliff,whichever is applicable. Refer to Figure G-2 and Figure G-3. You may find that specifically measuring these points is challenging if the flow path of the surface water changes frequently, thereby causing the measurement line for the buffer to fluctuate continuously along the path of the waterbody. Where this is the case, EPA suggests that rather than measuring each change or deviation along the water's edge, it may be easier to select regular intervals from which to conduct your measurement. For instance,you may elect to conduct your buffer measurement every 5 to 10 feet along the length of the water. Additionally, note that if earth-disturbing activities will take place on both sides of a surface water that flows through your site, to the extent that you are establishing a buffer around this water, it must be established on both sides. For example, if you choose alternative 1 above, and your project calls for disturbances on both sides of a small stream, you would need to retain the full 50 feet of buffer on both sides of the water. However, if your construction activities will only occur on one side of the stream,you would only need to retain the 50-foot buffer on the side of the stream where the earth- disturbance will occur. G-5 of 24 Construction General Permit (CGP) Figure G - 2.This image shows buffer measurement from the ordinary high water mark of the water body, as indicated by a clear natural line impressed on the bank,shelving, changes in the character of the soil, destruction of terrestrial vegetation, and/or the presence of litter/debris.• y ' Ai" rigN.- Surface Water er Ordinary Ordinary high water mark high water mark Figure G - 3.This image shows buffer measurement from the edge of the bank, bluff, or cliff, whichever is applicable. Edge of bank/bluff/cliff • Buffer-- u er-•—^�"4 Surface Water G-6 of 24 Construction General Permit (CGP) G.2.1.2 Limits to Disturbance Within the Buffer You are considered to be in compliance with this requirement if you retain and protect from construction activities the natural buffer that existed prior to the commencement of construction. If the buffer area contains no vegetation prior to the commencement of construction (e.g., sand or rocky surface), you are not required to plant any additional vegetation.As noted above, any preexisting structures or impervious surfaces are allowed in the buffer provided you retain and protect from disturbance the vegetation in the buffer outside the preexisting disturbance. To ensure that the water quality protection benefits of the buffer are retained during construction, you are prohibited from conducting any earth-disturbing activities within the buffer during permit coverage. In furtherance of this requirement, prior to commencing earth-disturbing activities on your site,you must delineate, and clearly mark off,with flags, tape, or a similar marking device, the buffer area on your site. The purpose of this requirement is to make the buffer area clearly visible to the people working on your site so that unintended disturbances are avoided. While you are not required to enhance the quality of the vegetation that already exists within the buffer, you are encouraged to do so where such improvements will enhance the water quality protection benefits of the buffer. (Note that any disturbances within the buffer related to buffer enhancement are permitted and do not constitute construction disturbances.) For instance,you may want to consider targeted plantings where limited vegetation exists, or replacement of existing vegetation where invasive or noxious plant species (see http://plants.usda.clov/Java/noxiousDriver) have taken over. In the case of invasive or noxious species, you may want to remove and replace them with a diversity of native trees,shrubs, and herbaceous plants that are well-adapted to the climatic, soil, and hydrologic conditions on the site. You are also encouraged to limit the removal of naturally deposited leaf litter, woody debris, and other biomass, as this material contributes to the ability of the buffer to retain water and filter pollutants. If a portion of the buffer area adjacent to the surface water is owned by another party and is not under your control,you are only required to retain and protect from construction activities the portion of the buffer area that is under your control. For example,if you elect alternative 1 above (provide and maintain a 50-foot buffer), but 10 feet of land immediately adjacent to the surface water is owned by a different party than the land on which your construction activities are taking place and you do not have control over that land,you must only retain and protect from construction activities the 40-foot buffer area that occurs on the property on which your construction activities are taking place. EPA would consider you to be in compliance with this requirement regardless of the activities that are taking place in the 10-foot area that is owned by a different party than the land on which your construction activities are taking place that you have no control over. G.2.1.3 Discharges to the Buffer You must ensure that all discharges from the area of earth disturbance to the natural buffer are first treated by the site's erosion and sediment controls (for example, you must comply with the Part 2.1.2.2 requirement to establish sediment controls around the downslope perimeter of your site disturbances), and if necessary to prevent erosion caused by stormwater flows within the buffer, you must use velocity dissipation devices. The purpose of this requirement is to decrease the rate of stormwater flow and G-7 of 24 Construction General Permit (CGP) encourage infiltration so that the pollutant filtering functions of the buffer will be achieved.To comply with this requirement, construction operators typically will use devices that physically dissipate stormwater flows so that the discharge entering the buffer is spread out and slowed down. G.2.1.4 SWPPP Documentation You are required to document in your SWPPP the natural buffer width that is retained. For example, if you are complying with alternative 1, you must specify in your SWPPP that you are providing a 50-foot buffer. Or, if you will be complying with alternative 2,you must document the reduced width of the buffer you will be retaining (and you must also comply with the requirements in Part 2.1.2.1c to describe the erosion and sediment controls you will use to achieve an equivalent sediment reduction, as described in Part G.2.2 below). Note that you must also show any buffers on your site plan in your SWPPP consistent with Part 7.2.6.3. Additionally, if any disturbances related to the exceptions in Part 2.1.2.1e occur within the buffer area,you must document this in the SWPPP. G.2.2 Guidance for Providing the Equivalent Sediment Reduction as the 50-foot Buffer If you are selecting Alternative 2 (provide and maintain a buffer that is less than 50 feet that is supplemented by additional erosion and sediment controls that, together, achieve the equivalent sediment load reduction as the 50-foot buffer) or Alternative 3 (implement erosion and sediment controls that achieve the equivalent sediment load reduction as the 50-foot buffer), the following guidance is intended to assist you in demonstrating that you will achieve the equivalent sediment reduction as the 50-foot buffer. G.2.2.1 Determine Whether it is Feasible to Provide a Reduced Buffer EPA recognizes that there will be a number of situations in which it will be infeasible to provide and maintain a buffer of any width. While some of these situations may exempt you from the buffer requirement entirely (see G.1.2), if you do not qualify for one of these exemptions, there still may be conditions or circumstances at your site that make it infeasible to provide a natural buffer. For example, there may be sites where a significant portion of the property on which the earth-disturbing activities will occur is located within the buffer area, thereby precluding the retention of natural buffer areas. EPA believes there are likely to be other examples of situations that make it infeasible to provide any buffer area. Therefore, in choosing between the 2 different compliance alternatives (Alternative 2 or 3), you should only elect to comply with Alternative 2 if it is feasible for you to retain any natural buffer on your site. (Note: For any buffer width retained,you are required to comply with the requirements in Part G.2.1, above, concerning the retention of vegetation and restricting earth disturbances.) Similarly, if you determine that it is infeasible to provide a natural buffer of any size during construction, you should elect to comply with Alternative 3. After making this determination,you should proceed to Part G.2.2.2 to determine how to provide controls that, together with any buffer areas that is being retained, if applicable,will achieve an equivalent sediment load reduction as the 50-foot buffer. G-8 of 24 Construction General Permit (CGP) G.2.2.2 Design Controls That Provide Equivalent Sediment Reduction as 50-foot Buffer You must next determine what additional controls must be implemented on your.site that, alone or in combination with any retained natural buffer, achieve a reducton in sediment equivalent to that achieved by a 50-foot buffer. Note that if only a portion of the natural buffer is less than 50 feet,you are only required to implement erosion and sediment controls that achieve the sediment load reduction equivalent to the 50 foot buffer for discharges through that area. You would not be required to provide treatment of stormwater discharges that flow through 50 feet or more of natural buffer.See Figure G 4. Figure G - 4 Example of how to comply with the requirement to provide the equivalent sediment reduction when only a portion of your earth-disturbances discharge to a buffer of less than 50- feet. ...........".:.,..,..,:,:..,.,,,..,,...,:,..„.,.,..::::„::,..:....,:,.,...,:,„„„..,.:..„,,,,,,,,,,,,,..":"E:E:::•El.1.E.Mili:1:.1',:::;.,:;;;;;;;;:":": "..1.:::H"'",:."•- ,Discharges through this /ow �) Surface area are.requireid to be treater to Water provide the equivalent sediment � reduction as the 50-faot buffer., ; t 50 ft-s Discharges through thisarea are �� not required to be treated to - m vase .. provide the equivalent sediment ,,$ � ,L g ieductfon as the 5Q-foot buffer sz @ s x m sincethe 50-foot buffer is provided. tOwdta e � � �jo s� t s Qf ,'s EBflf)h i itt rbance To comply with this requirement,you are required to do the following: Stepl - Estimate the sediment reduction expected from your site if you had retained a 50-foot natural buffer; Step 2 - Design controls that alone or in combination with any width of buffer retained achieve the equivalent sediment removal efficiency as that expected from the 50 foot buffer; and Step 3 - Document in your SW PPP how your controls will achieve the equivalent sediment removal efficiency of the 50 foot buffer. G-9 of 24 Construction General Permit (CGP) Guidelines to help you work through these requirements are provided below. a. Step 1 - Estimate the Sediment Reduction from the 50-foot Buffer In order to design controls that match the sediment removal efficiency of a 50- foot buffer,you first need to know what this efficiency is for your site. The sediment removal efficiencies of natural buffers vary according to a number of site-specific factors, including precipitation,soil type, land cover,slope length, width, steepness, and the types of sediment controls used to reduce the discharge of sediment prior to the buffer. EPA has simplified this calculation by developing buffer performance tables covering a range of vegetation and soil types for the areas covered by the CGP. See Attachment 1,Tables G -8 through G- 15. Note:buffer performance values in Tables G-8 through G- 15 represent the percent of sediment captured through the use of perimeter controls (e.g., silt fences) and 50-foot buffers at disturbed sites of fixed proportions and slopes.2 Using Tables G-8 through G- 15 (see Attachment 1),you can determine the sediment removal efficiency of a 50-foot buffer for your geographic area by matching the vegetative cover type that best describes your buffer area and the type of soils that predominate at your site. For example, if your site is located in Massachusetts (Table G-9), and your buffer vegetation corresponds most closely with that of tall fescue grass, and the soil type at your site is best typified as sand, your site's sediment removal efficiency would be 81 percent. In this step,you should choose the vegetation type in the tables that most closely matches the vegetation that would exist naturally in the buffer area on your site regardless of the condition of the buffer. However, because you are not required to plant any additional vegetation in the buffer area, in determining what controls are necessary to meet this sediment removal equivalency in Step 2 below,you will be able to take credit for this area as a fully vegetated "natural buffer." Similarly, if a portion of the buffer area adjacent to the surface water is owned by another party and is not under your control,you can treat the area of land not 2 EPA used the following when developing the buffer performance tables: • The sediment removal efficiencies are based on the U.S.Department of Agriculture's RUSLE2("Revised Universal Soil Loss Equation 2") model for slope profiles using a 100-foot long denuded slopes. • Sediment removal was defined as the annual sediment delivered at the downstream end of the 50-foot natural buffer(tons/yr/acre)divided by the annual yield from denuded area(tons/yr/acre). • As perimeter controls are also required by the CGP,sediment removal is in part a function of the reduction due to a perimeter control(i.e.,silt fence) located between the disturbed portion of the site and the upstream edge of the natural buffer and flow traveling through a 50-foot buffer of undisturbed natural vegetation. • It was assumed that construction sites have a relatively uniform slope without topographic features that accelerate the concentration for erosive flows. • It was assumed that vegetation has been removed from the disturbed portion of the site and a combination of cuts and fills have resulted in a smooth soil surface with limited retention of near-surface root mass To represent the influence of soil,EPA analyzed 11 general soil texture classifications in its evaluation of buffer performance. To represent different types of buffer vegetation, EPA evaluated 4 or more common vegetative types for each state/territory covered under the permit.For each vegetation type evaluated,EPA considered only permanent, non-grazed and non-harvested vegetation,on the assumption that a natural buffer adjacent to the surface water will typically be undisturbed. EPA also evaluated slope steepness and found that sediment removal efficiencies present in Tables G-8 through G- 15 are achievable for slopes that are less than nine percent. G-10 of 24 Construction General Permit (CGP) under control as having the equivalent vegetative cover and soil type that predominates on the portion of the property on which your construction activities are occurring. For example, if your earth-disturbances occur within 50 feet of a surface water, but the 10 feet of land immediately adjacent to the surface water is owned by a different party than the land on which your construction activities are taking place and you do not have control over that land, you can treat the 10 foot area adjacent to the stream as having the equivalent soil and vegetation type as predominates in the 40 foot area under your control. You would then make the same assumption in Step 2 for purposes of determining the equivalent sediment removal. Alternatively, you may do your own calculation of the effectiveness of the 50-foot buffer based upon your site-specific conditions, and may use this number as your sediment removal equivalency standard to meet instead of using Tables G-8 through G- 15.This calculation must be documented in your SWPPP. b. Step 2 - Design Controls That Match the Sediment Removal Efficiency of the 50- foot Buffer Once you have determined the estimated sediment removal efficiency of a 50- foot buffer for your site in Step 1, you will be required to select stormwater controls that will provide an equivalent sediment load reductions. These controls can include the installation of a single designed control,such as a sediment pond, additional perimeter controls, or other type of device. Alternatively,you may elect to install a combination of stormwater controls and to retain some amount of a buffer. Whichever control(s) you select,you must demonstrate in your SWPPP that the controls will provide at a minimum the same sediment removal capabilities as the 50-foot buffer (Step 1).You are allowed to take credit for the removal efficiencies of your required perimeter controls in your calculation of equivalency, because these were included in calculating the buffer removal efficiencies in tables G-8 through G- 15. (Note: You are reminded that the controls must be kept in effective operating condition until you have completed final stabilization on the disturbed portions of the site discharging to the surface water.) To make the determination that your controls and/or buffer area achieve an equivalent sediment load reduction as the 50-foot buffer,you will need to use a model or other type of calculator. As mentioned above, there are a variety of models available that can be used to support your calculation, including USDA's RUSLE-series programs and the WEPP erosion model, SEDCAD, SEDIMOT, or other models. A couple of examples are provided in Attachment 3 to help illustrate how this determination could be made. If you are retaining a buffer of less than 50 feet, you may take credit for the removal that will occur from the reduced buffer and only need to provide additional controls to make up the difference between the removal efficiency of a 50 foot buffer and the removal efficiency of the narrower buffer. For example, if you are retaining a 30 foot buffer,you can account for the sediment removal provided by the 30-foot buffer retained, and you will only need to design controls to make up for the additional removal provided by the 20-foot of buffer that is not being provided.To do this, you would plug the width of the buffer that is G-11 of 24 Construction General Permit (CGP) retained into RUSLE or another model, along with other stormwater controls that will together achieve a sediment reduction equivalent to a natural 50-foot buffer. As described in Step 1 above, you can take credit for the area you have retained as a "natural buffer" as being fully vegetated, regardless of the condition of the buffer area. For example, if your earth-disturbances occur 30 feet from a surface water, but the 10 feet of land immediately adjacent to the surface water is owned by a different party than the land on which your construction activities are taking place and you do not have control over that land, you can treat the 10-foot area as a natural buffer, regardless of the activities that are taking place in the area. Therefore, you can assume (for purposes of your equivalency calculation) that your site is providing the sediment removal equivalent of a 30-foot buffer, and you will only need to design controls to make up for the additional removal provided by the 20- foot of buffer that is not being provided. c. Step 3 - Document How Site-Specific Controls Will Achieve the Sediment Removal Efficiency of the 50-foot Buffer In Steps 1 and 2, you determined both the expected sediment removal efficiency of a 50-foot buffer at your site, and you used this number as a performance standard to design controls to be installed at your site,which alone or in combination with any retained natural buffer, achieves the expected sediment removal efficiency of a 50-foot buffer at your site.The final step is to document in your SWPPP the information you relied on to calculate the equivalent sediment reduction as an undisturbed natural buffer. EPA will consider your documentation to be sufficient if it generally meets the following: - For Step 1, refer to the table in Attachment 1 that you used to derive your estimated 50-foot buffer sediment removal efficiency performance. Include information about the buffer vegetation and soil type that predominate at your site,which you used to select the sediment load reduction value in Tables G-8 through G- 15. Or,if you conducted a site-specific calculation for sediment removal efficiency, provide the specific removal efficiency, and the information you relied on to make your site-specific calculation. - For Step 2: (1) Specify the model you used to estimate sediment load reductions from your site; and (2) the results of calculations showing how your controls will meet or exceed the sediment removal efficiency from Step 1. If you choose Alternative 3,you must also include in your SWPPP a description of why it is infeasible for you to provide and maintain an undisturbed natural buffer of any size. G-12 of 24 Construction General Permit (CGP) G.2.3 Small Residential Lot Compliance Alternatives In this part of Appendix G, EPA provides additional A small residential lot is a lot or grouping of lots compliance alternatives for being developed for residential purposes that will operators of small residential disturb less than 1 acre of land,but that is part of a lots. In accordance with Part larger residential project that will ultimately disturb 2.1.2.1 e.iv, operators of small greater than or equal to 1 acre. residential lots who do not provide a 50-foot buffer are not required to make the demonstration outlined in Part G.2.2.2. Instead, qualifying operators can comply with the buffer requirement by choosing to implement a set of traditional sediment and erosion controls from the menu of practices provided in Part G.2.3.2. EPA has developed two different alternatives for compliance. The following steps describe how a small residential lot operator would achieve compliance with these 2 alternatives. G.2.3.1 Step 1 -Determine if You are Eligible for the Small Residential Lot Compliance Alternatives In order to be eligible for the small residential lot compliance alternatives, the following conditions must be met: a. The lot or grouping of lots meets the definition of "small residential lot"; and b. The operator must comply with all other requirements in Part 2.1.2.1, including: i. Ensure that all discharges from the area of earth disturbance to the natural buffer are first treated by the site's erosion and sediment controls, and use velocity dissipation devices if necessary to prevent erosion caused by stormwater within the buffer; ii. Document in the SWPPP the natural buffer width retained on the property, and show the buffer boundary on your site plan; and iii. Delineate, and clearly mark off,with flags, tape, or other similar marking device, all natural buffer areas. G.2.3.2 Step 2-Implement the Requirements of the Small Residential Lot Compliance Alternative Selected You must next choose from one of two small residential lot compliance alternatives and implement the stormwater control practices associated with that alternative. Note: The compliance alternatives provided below are not mandatory. Operators of small residential lots can alternatively choose to comply with the any of the options that are available to other sites in Part 2.1.2.1a, described in Parts G.2.1 and G.2.2 in this appendix. a. Small Residential Lot Compliance Alternative 1 Alternative 1 is a straightforward tiered-technology approach that specifies the controls that a small residential lot must implement based on the buffer width retained. To achieve compliance with Alternative 1, you must implement the G-13 of 24 Construction General Permit (CGP) controls specified in Table G- 1 based on the buffer width to be retained.See footnote 3, below, for a description of the controls you must implement. For example, if you are an operator of a small residential lot that will be retaining a 35-foot buffer and you choose Small Residential Lot Compliance Alternative 1, you must implement double perimeter controls between earth disturbances and the surface water. In addition to implementing the applicable control, you must also document in your SWPPP how you will comply with Alternative 1. Table G - 1. Alternative 1 Re•uirements3 t i ; 3 ke g rt and 3Et ttb s fbttt� x(� • 4 1Jfte0 l� r • ,° e„"-,�;.�� 4� a i mf a, k�,.:0 task e ka; °k � � ;� .� s ak��a A� � e% No Additional Requirements Double Perimeter Controls Double Perimeter Controls and 7-Day Site Stabilization b. Small Residential Lot Compliance Alternative 2 Alternative 2 specifies the controls that a builder of a small lot must implement based on both the buffer width retained and their risk of sediment discharge. By incorporating the sediment risk, this approach may result in the implementation of controls that are more appropriate for the site's specific conditions. Step 1 -Determine Your Site's Sediment Risk Level To meet the requirements of Alternative 2, you must first determine your site's sediment discharge "risk level" based on the site's slope, location, and soil type. To help you to determine your site's sediment risk level, EPA has developed five different tables for different slope conditions.You must select the table that most closely corresponds to your site's average slope. For example, if your site's average slope is 7 percent, you would use Table G-4 to determine your site's sediment risk. After you determine which table applies to your site, you must then use the table to determine the "risk level" (e.g., "low", "moderate", or "high") that corresponds to your site's location and predominant soil type.4 For example, based on Table G-3, a site located in New Hampshire with a 4 percent average slope and with predominately sandy clay loam soils would fall into the "moderate"risk level. 3 Description of Additional Controls Applicable to Small Residential Lot Compliance Alternatives 1 and 2: • No Additional Requirements:If you implement a buffer of 50 feet or greater,then you are not subject to any additional requirements.Note that you are required to install perimeter controls between the disturbed portions of your site and the buffer in accordance with Part 2.1.2.2. • Double Perimeter Control:In addition to the reduced buffer width retained on your site,you must provide a double row of perimeter controls between the disturbed portion of your site and the surface water spaced a minimum of 5 feet apart. • Double Perimeter Control and 7-Day Site Stabilization:In addition to the reduced buffer width retained on your site and the perimeter control implemented in accordance with Part 2.1.2.2,you must provide a double row of perimeter controls between the disturbed portion of your site and the surface water spaced a minimum of 5 feet apart,and you are required to complete the stabilization activities specified in Parts 2.2.1.2a and/or 2.2.1.2b within 7 calendar days of the temporary or permanent cessation of earth-disturbing activities. 4 One source for determining your site's predominant soil type is the USDA's Web Soil Survey located at http://websoilsurvev.nres.usda.aov/app/WebSoilSurvev.asox. G-14 of 24 Construction General Permit (CGP) Table G - 2. Risk Levels for Sites with Average Slopes of<_3 Percent Soil Type Sandy Clay Loam,Loamy Loam,Silt, Silty Clay Loam or Sand or Silty Sandy Loam or Location Clay Clay-Loam Sand Clay Silt Loam Guam Moderate Moderate Moderate Moderate Puerto Rico Moderate Moderate Moderate Moderate itii14, t;' Virgin Islands Moderate Moderate Moderate American Samoa Moderate Moderate Moderate Moderate iii t t;9 Massachusetts and New Hampshire Moderate Moderate Idaho , _ New Mexico Washington D.C. r:w Moderate _ Moderate Table G - 3. Risk Levels for Sites with Average Slopes of>3 Percent and <_6 Percent Soil Type Sandy Clay Loam,Loamy Loam,Silt, Silty Clay Loam or Sand or Silty Sandy Loam or Location Clay Clay-Loam Sand Clay Silt Loam Guam Moderate Moderate Moderate Moderate ati ittt Puerto Rico Moderate Moderate Moderate Moderate 1.inig t31, Virgin Islands Moderate Moderate Moderate Moderate glgtilltiriktill Moderate 1 � American Samoa gill! Massachusetts and New 11E Moderate Moderate Moderate Hampshire As Idaho New Mexico Moderate Washington D.C. Moderate Moderate Moderate Moderate �� t � � n , G-15 of 24 Construction General Permit (CGP) Table G - 4. Risk Levels for Sites with Average Slopes of> 6 Percent and<_ 9 Percent Soil Type Sandy Clay Loam, Loamy Loam,Silt, Silty Clay Loam Sand or Silty Sandy Loam Location Clay or Clay Loam Sand Clay or Silt Loam Guam Moderate �� Moderate '' Puerto Rico Moderate' . Moderate Moderate /� x Virgin Islands Moderate �1,Moderate Moderate Moderate American Samoa ° ��; !a' , i �, � ?t ' gl• Massachusetts and New � � Hampshire Moderate Moderate Moderate Moderate i ' ig i � ,,',4-tt',1'.•-.1;,',,.1%,,,,,.''...:::',;t � Idaho New Mexico Moderate`_;' Washington D.C. Moderate' $ '»Moderate Moderate Moderate Table G - 5. Risk Levels for Sites with Average Slopes of> 9 Percent and<_ 15 Percent Soil Type Sandy Clay Silty Clay Loam,Loamy Loam,Silt, Loam or Clay- Sand or Silty Sandy Loam Location Clay Loam Sand Clay or Silt Loam tilauval Guam � i �I � � �p �� g aa . 3 i "Q� E '. Puerto Rico �� a aa�� s5 ,. s 0,4,..„,�'1 r▪ CHI ,4a q !. w �' � ii... .. i3� � ..1 ' 1 l'4"*� ®.1i via l as ▪ 5 t , t � H � �� X Virgin Islands Moderate 3 F t3� Moderate 1:, ig ie gotIl American Samoa # a€ � � � 3 � igh Hi F , Massachusetts and New f 1? Moderate Moderate Moderate Moderate � _ , Hampshire Idaho ��ti ; New Mexico Moderate Moderate Moderate ,,,',salt., , i ,t , Moderate Moderate i ' Washington D.C. Moderate k . to G-16 of 24 Construction General Permit (CGP) Table G - 6. Risk Levels for Sites with Avera•e Slopes of> 15 Percent Soil Type Sandy Clay Silty Clay Loam, Loamy Loam,Silt, Loam or Clay- Sand or Silty Sandy Loam Location Clay Loam Sand Clay or Silt Loam Guam r 11 -..•°••• t 4 � � < # Puerto Rico z C Virgin Islands � h�= .t. ,;� � � � �� 1011110. American Samoa :: .j �*it t :' z 'a .J1t1- 4110 11 Massachusetts and New i f IP . itr � � r � ril r� r° Zan K� ®. • Moderatet i Hampshire �;� � , ` ., � .,t� . . ,,ma �® at� � ... �` Idaho Moderate New Mexico MOd'e;-ate s Moderate Moderate Mo derate®Washington D.C. tut, � 0 t r Moderate g_ t� s Step 2-Determine Which Additional Controls Apply Once you determine your site's "risk level",you must next determine the additional controls you need to implement on your site, based on the width of buffer you plan to retain. Table G-7 specifies the requirements that apply based on the "risk level" and buffer width retained. See footnote 3, above,for a description of the additional controls that are required. For example, if you are the operator of a small residential lot that falls into the "moderate"risk level, and you decide to retain a 20-foot buffer, using Table G-7 you would determine that you need to implement double perimeter controls to achieve compliance with Part 2.1.2.1. You must also document in your SWPPP your compliance with Alternative 2. Table G - 7.Alternative 2 Re•uirements2 Low Risk No Additional No Additional Double Perimeter Double Perimeter Requirements Requirements Control Control Moderate Risk No Additional Double Perimeter Double Perimeter Double Perimeter Requirements Control Control Control and 7- Day Site Stabilization Hi h Rrsk No Additional Double Perimeter Double Perimeter Double Perimeter Requirements Control Control and 7- Control and 7- Day Site Day Site Stabilization Stabilization G-17 of 24 Construction General Permit (CGP) ATTACHMENT 1 Sediment Removal Efficiency Tables- EPA recognizes that very high removal efficiencies, even where theoretically achievable by a 50-foot buffer, may be very difficult to achieve in practice using alternative controls. Therefore in the tables below, EPA has limited the removal efficiencies to a maximum of 90%. Efficiencies that were calculated at greater than 90%are shown as 90%, and this is the minimum percent removal that must be achieved by alternative controls. Table G - 8. Estimated 50-foot Buffer Performance in Idaho* Estimated%Sediment Removal Sandy Clay Silty Clay Loam, Loam,Silt, Loam or Loamy Sand : Sandy',Loam Type of Buffer Vegetation** Clay Clay-Loam Sand or Silty Clay or Silt Loam Tali;Fescue Grass 42 52 44 48 85 Medium-density Weeds 28 30 28 26 60 Low-density Warm-season Native Bunchgrass(i.e., 25 26 24 24 55 Grama Grass) Northern Mixed Prairie Grass 28 30 28 26 50 Northern Range Cold Desert 28 28 24 26 50 Shrubs *Applicable for sites with less than nine percent slope **Characterization focuses on the under-story vegetation Table G - 9. Estimated 50-foot Buffer Performance in Massachusetts and New Hampshire* Estimated%Sediment,Removal Sandy Clay Silty Cloy ! Loam, Loam,Silt, Loam or Loamy Sand Sandy Loam Type of Buffer Vegetation** Clay Clay-Loam Sand or Silty Clay or Silt Loam Warm-season Grass(i.e., 79 90 90 90 90 Switchgrass,Lemongrass) Cool-season Dense Grass (Kentucky Bluegrass,Smooth 78 90 90 90 90 Bromegrass,Timothy) Tall Fescue Grass 76 90 81 89 90 Medium-density Weeds 66 76 60 72 66 *Applicable for sites with less than nine percent slope **Characterization focuses on the under-story vegetation 5 The buffer performances were calculated based on a denuded slope upgradient of a 50-foot buffer and a perimeter controls, as perimeter controls are a standard requirement (see Part 2.1.2.2). G-18 of 24 Construction General Permit (CGP) Table G - 10. Estimated 50-foot Buffer Performance in New Mexico* Estimated°%Sediment Removal Sandy Clay Silty Clay Loam, Loam,Silt, Loam or Loamy Sand Sandy,Loam Type of Buffer Vegetation** Clay Clay-Loam Sand or Silty Clay or Silt Loam Tall Fescue grass 71 85 80 86 90 Medium-density Weeds 56 73 55 66 78 Low-density Warm-season"'- Native Bunchgrass(i.e., 53 70 51 62 67 Grama Grass) Southern Mixed Prairie Grass 53 71 52 63 50 Southern Range Cold Desert 56 73 55 65 53 Shrubs *Applicable for sites with less than nine percent slope **Characterization focuses on the under-story vegetation Table G - 11. Estimated 50-foot Buffer Performance in Washington, DC* Estimated%Sediment Removal Sandy Clay Silty Clay Loam, Loam,Silt, Loam or Loamy Sand Sandy Loam Type of Buffer Vegetation** Clay Clay-Loam Sand or Silty Clay or Silt Loam Warm-season Grass(i.e., 82 90 90 90 90 Switchgrass,Lemongrass) Cool-season Dense Grass (Kentucky Bluegrass,Smooth 81 90 90 90 90 Bromegrass,Timothy) Tall Fescue Grass 79 90 83 89 90 Medium-density Weeds 71 79 66 75 74 *Applicable for sites with less than nine percent slope **Characterization focuses on the under-story vegetation Table G - 12. Estimated 50-foot Buffer Performance in American Samoa* Estimated%Sediment Removal Sandy Clay Silty Clay Loam, Loam,Silt, Loam or Loamy Sand Sandy Loam Type of Buffer Vegetation** Clay Clay-Loam Sand or Silty Clay or Silt Loam Bahiagrass(Permanent cover) 82 90 90 90 83 Warm-season Grass(i.e., 82 90 90 90 85 Switchgrass,Lemongrass) Dense Grass 82 90 90 90 83 Tali Fescue Grass 82 89 82 89 79 Medium-density Weeds 70 73 62 75 59 *Applicable for sites with less than nine percent slope **Characterization focuses on the under-story vegetation G-19 of 24 Construction General Permit (CGP) Table G - 13. Estimated 50-foot Buffer Performance in Guam* Estimated%Sediment Removal Sandy Clay Silty Clay Loam, Loam,Silt, Loam or Loamy Sand Sandy Loam Type of Buffer Vegetation** Clay Clay-Loam Sand or Silty Clay or Silt Loam Bahiagrass(Permanent 80 90 90 90 89 cover) Warm-season Grass(Le., 80 90 90 90 90 Switchgrass,Lemongrass) Dense Grass 79 90 90 90 89 Tall Fescue Grass '. 76 90 80 88 87 Medium-density Weeds 63 73 53 68 61 *Applicable for sites with less than nine percent slope **Characterization focuses on the under-story vegetation Table G - 14. Estimated 50-foot Buffer Performance in Puerto Rico* Estimated%Sediment Removal Sandy Clay Silty Clay Loam, Loam,Silt, Loam or Loamy Sand Sandy Loam Type of Buffer Vegetation** Clay Clay-Loam Sand or Silty Clay or Silt Loam Bahiagrass(Permanent 83 90 90 90 90 cover) Warm-season Grass(i.e., 83 90 90 90 90 Switchgrass,Lemongrass) Dense Grass 83 90 90 90 90 Tall Fescue Grass 82 90 84 90 89 Medium-density Weeds 72 78 65 76 64 *Applicable for sites with less than nine percent slope **Characterization focuses on the under-story vegetation Table G - 15. Estimated 50-foot Buffer Performance in Virgin Islands* Sandy Clay Silty Clay Loam, Loam,Silt, Loam or Loamy Sand Sandy Loam Type of Buffer Vegetation** Clay Clay-Loam Sand or Silty Clay or Silt Loam Bahiagrass(Permanent 85 90 90 90 90 cover) Warm-season Grass(i.e., 86 90 90 90 90 Switchgrass,Lemongrass) Dense Grass 85 90 90 90 90 Tall Fescue Grass 85 90 88 90 89 Medium-density Weeds 75 77 71 78 63 *Applicable for sites with less than nine percent slope **Characterization focuses on the under-story vegetation G-20 of 24 Construction General Permit (CGP) ATTACHMENT 2 Using the Sediment Removal Efficiency Tables-Questions and Answers - What if my specific buffer vegetation is not represented in Tables G-8 through G- 15? Tables G-8 through G- 15 provide a wide range of factors affecting buffer performance; however, there may be instances where the specific buffer vegetation type on your site is not listed. If you do not see a description of the type of vegetation present at your site, you should choose the vegetation type that most closely matches the vegetation type on your site. You can contact your local Cooperative Extension Service Office (www.csrees.usda.gov/Extension) for assistance in determining the vegetation type in Tables G-8 through G- 15 that most closely matches your site-specific vegetation. - What if there is high variability in local soils? EPA recognizes that there may be a number of different soil type(s) on any given construction site. General soil information can be obtained from USDA soil survey reports (httb://websoilsurvey.nres.usda.ciov) or from individual site assessments performed by a certified soil expert. Tables G-8 through G- 15 present eleven generic soil texture classes, grouping individual textures where EPA has determined that performance is similar. If your site contains different soil texture classes, you should use the soil type that best approximates the predominant soil type at your site. - What if my site slope is greater than 9 percent after final grade is reached? As indicated in the buffer performance tables, the estimated sediment removal efficiencies are associated with disturbed slopes of up to 9 percent grade. Where your graded site has an average slope of greater than 9 percent,you should calculate a site-specific buffer performance. - How do I calculate my own estimates for sediment reduction at my specific site? If you determine that it is necessary to calculate your own sediment removal efficiency using site- specific conditions (e.g., slopes at your site are greater than 9 percent),you can do so by choosing from a range of available mathematical models that are available to facilitate this calculation, including USDA's RUSLE-series programs and the WEPP erosion model, SEDCAD, SEDIMOT, or other equivalent models. - What is my estimated buffer performance if my site location is not represented by Tables G- 8 through G- 15? If your site is located in an area not represented by Tables G-8 through G - 15, you should use the table that most closely approximates conditions at your site. You may also choose to conduct a site-specific calculation of the buffer performance. - What if only a portion of my site drains to the buffer area? If only a portion of your site drains to a surface water,where that water is within 50 feet of your construction activities,you are only required to meet the equivalency requirement for the stormwater flows corresponding to those portions of the site. See Example 2 below for an example of how this is expected to work. G-21 of 24 Construction General Permit (CGP) ATTACHMENT 3 Examples of How to Use the Sediment Removal Efficiency Tables Example 1. Comparatively Wet Location (7.5 acre site located in Massachusetts) The operator of a 7.5-acre construction site in Massachusetts has determined that it is infeasible to establish a buffer of any size on their site, and is now required to select and install controls that will achieve an equivalent sediment load reduction as that estimated in G-9 for their site conditions. The first step is to identify what percentage of eroded sediment is estimated to be retained from a 50-foot buffer. For this example, it is assumed that the site has a relatively uniform gentle slope (3 percent), so Table G-9 can be used to estimate the 50-foot buffer sediment load reduction. If the site's buffer vegetation is best typified by cool-season dense grass and the underlying soil is of a type best described as loamy sand, the 50-foot buffer is projected to capture 90 percent of eroded sediment from the construction site. The second step is to determine what sediment controls can be selected and installed in combination with the perimeter controls already required to be implemented at the site (see Part 2.1.2.2), which will achieve the 90 percent sediment removal efficiency from Table G-9. For this example, using the RUSLE2 profile model, it was determined that installing a pair of shallow- sloped diversion ditches to convey runoff to a well-designed and maintained sediment basin provides 99 percent sediment removal. Because the estimated sediment reduction is greater than the required 90 percent that a 50-foot buffer provides, the operator will have met the buffer requirements.See Figure G-5. The operator could also choose a different set of controls, as long as they achieve at least a 90 percent sediment removal efficiency. G-22 of 24 Construction General Permit (CGP) Figure G - 5. Example 1 -Equivalent Sediment Load Reductions at a 7.5 ac Site in MA. Swale 7.5 acres draining to buffer areas ♦ 44 „ ,;4444 . Basin • - Diversion Dike ♦♦Averageflow distance=80feet Zg; / r �' 14 ♦ 4047 ° ♦ r ,►yam Diversion Dike Surface Water Example 2. Arid Location With Pre-existing Disturbances in the Natural Buffer(6.5 acre site located in New Mexico) An operator of a site in New Mexico determines that it is not practicable to provide a 50-foot buffer, but a 28-foot buffer can be provided. Because the operator will provide a buffer that is less than 50 feet, the operator must determine which controls, in combination with the 28-foot buffer, achieve a sediment load reduction equivalent to the 50-foot buffer. In this example, the project will disturb 6.5 acres of land, but only 1.5 acres of the total disturbed area drains to the buffer area. Within the 28-foot buffer area is a preexisting concrete walkway.Similar to Example 1, the equivalence analysis starts with Step 1 (Part G.2.2.2) with a review of the New Mexico buffer performance (Table G- 10). The operator determines that the predominate vegetation type in the buffer area is prairie grass and the soil type is similar to silt, and that the site is of a uniform, shallow slope (e.g., 3 percent grade). Although the operator will take credit for the disturbance caused by the concrete walkway as a natural buffer in Step 2, here the operator can treat the entire buffer area as being naturally vegetated with prairie grass. Based on this information, the operator refers to Table G- 10 to estimate that the 50-foot buffer would retain 50 percent of eroded soil. The second step is to determine, based on the 50 percent sediment removal efficiency found in Table G- 10,what sediment controls in combination with the 28-foot buffer area, can be G-23 of 24 Construction General Permit (CGP) implemented to reduce sediment loads by 50 percent or more.The operator does not have to account the reduction in buffer function caused by the preexisting walkway, and can take credit for the entire 28-foot buffer being fully vegetated in the analysis. For this example, using the RUSLE2 profile model, the operator determined that installing a fiber roll barrier between the silt fence (already required by Part 2.1.2.2) and the 28-foot buffer will achieve an estimated 84 percent sediment removal efficiency.See Figure G-6. Note that this operator is subject to the requirement in Part 2.1.2.1 b.i to ensure that discharges through the silt fence, fiber roll barrier, and 28-foot buffer do not cause erosion within the buffer. The estimated sediment reduction is greater than the required 50 percent;therefore the operator will have met the buffer alternative requirement. Figure G - 6. Example 2-Equivalent Sediment Load Reductions at a 6.5 ac Site in NM. 1.5 acres draining to buffer areas Silt Fence Fiber Roll Barrier 28-ft Vegetated Buffer Concrete , Walkway mss ?fi0 y :z .- w 041 Distributed ' kyh, � :. ;. = , „, _,;�. -'• . discharge into water of the U.S. G-24 of 24 ISWM''Technical Manual Construction Controls iSWM'M Technical Manual Construction Controls Table of Contents 1.0 Overview of Construction Controls CC-1 1.1 Introduction CC-1 1.2 Control Selection Guide CC-1 C1.2.1 Erosion Controls CC-2 0 n s tru cti o n 1.2.2 Sediment Controls CC-2 1.2.3 Material and Waste Controls CC-4 • 1.3 Site Rating Calculation CC-5 Controls• 1.3.1 Introduction CC-5 1.3.2 Background CC-5 1.3.3 Methodology CC-5 1.3.4 Summary CC-10 1.0 Overview of Construction Controls 2.0 Erosion Controls CC-12 2.0 Erosion Controls 2.1 Check Dam CC-12 2.1.1 Primary Use CC-13 3.0 Sediment Controls 2.1.2 Applications CC-13 4.0 Material Waste Controls 2.1.3 Design Criteria CC-13 2.1.4 Design Guidance and Specifications CC-15 2.1.5 Inspection and Maintenance Requirements CC-15 2.1.6 Example Schematics CC-15 2.2 Diversion Dike CC-20 2.2.1 Primary Use CC-21 2.2.2 Applications CC-21 2.2.3 Design Criteria CC-21 2.2.4 Design Guidance and Specifications CC-22 2.2.5 Inspection and Maintenance Requirements CC-22 2.2.6 Example Schematics CC-22 2.3 Erosion Control Blankets CC-25 2.3.1 Primary Use CC-26 2.3.2 Applications CC-26 2.3.3 Design Criteria CC-26 2.3.4 Design Guidance and Specifications CC-27 2.3.5 Inspection and Maintenance Requirements CC-27 2.3.6 Example Schematics CC-27 2.4 Interceptor Swale CC-30 Construction Controls CC-i Revised 04/10 iSWM-"'Technical Manual Construction Controls iSWM'"'Technical Manual Construction Controls 2.4.1 Primary Use CC-31 2.9.4 Design Guidance and Specifications CC-58 2.4.2 Applications CC-31 2.9.5 Inspection and Maintenance Requirements CC-58 2.4.3 Design Criteria CC-31 2.10 Velocity Dissipation Devices CC-60 2.4.4 Design Guidance and Specifications CC-32 2.10.1 Primary Use CC-61 2.4.5 Inspection and Maintenance Requirements CC-32 2.10.2 Applications CC-61 2.4.6 Example Schematics CC-32 2.10.3 Design Criteria CC-61 2.5 Mulching CC-34 2.10.4 Design Guidance and Specifications CC-62 2.5.1 Primary Use CC-35 2.10.5 Inspection and Maintenance Requirements CC-62 2.5.2 Applications CC-35 2.10.6 Example Schematics CC-62 2.5.3 Design Criteria CC-35 3.0 Sediment Controls CC-64 2.5.4 Design Guidance and Specifications CC-37 3.1 Active Treatment System(ATS) CC-64 2.5.5 Inspection and Maintenance Requirements CC-38 3.1.1 Primary Use CC-65 2.6 Pipe Slope Drain CC-39 3.1.2 Applications CC-65 2.6.1 Primary Use CC-40 3.1.3 Design Criteria CC-65 2.6.2 Applications CC-40 3.1.4 Design Guidance and Specifications CC-68 2.6.3 Design Criteria CC-40 3.1.5 Inspection and Maintenance Requirements CC-68 2.6.4 Design Guidance and Specifications CC-41 3.1.6 Example Schematics CC-68 2.6.5 Inspection and Maintenance Requirements CC-41 3.2 Depressed Grade(Curb Cut-Back)Sediment Trap CC-70 2.6.6 Example Schematics CC-41 3.2.1 Primary Use CC-71 2.7 Soil Surface Treatments CC-43 3.2.2 Applications CC-71 2.7.1 Primary Use CC-44 3.2.3 Design Criteria CC-71 2.7.2 Applications CC-44 3.2.4 Design Guidance and Specifications CC-71 2.7.3 Design Criteria CC-44 3.2.5 Inspection and Maintenance Requirements CC-71 2.7.4 Design Guidance and Specifications CC-47 3.2.6 Example Schematics CC-71 2.7.5 Inspection and Maintenance Requirements CC-47 3.3 Dewatering Controls CC-75 2.8 Turf Reinforcement Mats CC-48 3.3.1 Primary Use CC-76 2.8.1 Primary Use CC-49 3.3.2 Applications CC-76 2.8.2 Applications CC-49 3.3.3 Design Criteria CC-76 2.8.3 Design Criteria CC-49 3.3.4 Design Guidance and Specifications CC-78 2.8.4 Design Guidance and Specifications CC-50 3.3.5 Inspection and Maintenance Requirements CC-78 2.8.5 Inspection and Maintenance Requirements CC-50 3.3.6 Example Schematics CC-79 2.8.6 Example Schematics CC-50 3.4 Inlet Protection CC-81 2.9 Vegetation CC-53 3.4.1 Primary Use CC-82 2.9.1 Primary Use CC-54 3.4.2 Applications CC-82 2.9.2 Applications CC-54 3.4.3 Design Criteria CC-82 2.9.3 Design Criteria CC-54 3.4.4 Design Guidance and Specifications CC-86 Construction Controls CC-ii Construction Controls CC-iii Revised 04/10 Revised 04/10 iSW Mr"Technical Manual Construction Controls iSW M'""Technical Manual Construction Controls 3.4.5 Inspection and Maintenance Requirements CC-86 3.9.7 Design Procedures CC-125 3.4.6 Example Schematics CC-86 3.9.8 Design Form CC-140 3.5 Organic Filter Berm CC-96 3.10 Silt Fence CC-143 3.5.1 Primary Use CC-97 3.10.1 Primary Use CC-144 3.5.2 Applications CC-97 3.10.2 Applications CC-144 3.5.3 Design Criteria CC-97 3.10.3 Design Criteria CC-144 3.5.4 Design Guidance and Specifications CC-97 3.10.4 Design Guidance and Specifications CC-145 3.5.5 Inspection and Maintenance Requirements CC-97 3.10.5 Inspection and Maintenance Requirements CC-145 3.5.6 Example Schematics CC-98 3.10.6 Example Schematics CC-146 3.6 Organic Filter Tubes CC-100 3.11 Stabilized Construction Exit CC-148 3.6.1 Primary Use CC-101 3.11.1 Primary Use CC-149 3.6.2 Applications CC-101 3.11.2 Applications CC-149 3.6.3 Design Criteria CC-101 3.11.3 Design Criteria CC-149 3.6.4 Design Guidance and Specifications CC-103 3.11.4 Design Guidance and Specifications CC-150 3.6.5 Inspection and Maintenance Requirements CC-103 3.11.5 Inspection and Maintenance Requirements CC-150 3.6.6 Example Schematics CC-103 3.11.6 Example Schematics CC-150 3.7 Passive Treatment System(PTS) CC-106 3.12 Stone Outlet Sediment Trap CC-152 3.7.1 Primary Use CC-107 3.12.1 Primary Use CC-153 3.7.2 Applications CC-107 3.12.2 Applications CC-153 3.7.3 Design Criteria CC-107 3.12.3 Design Criteria CC-153 3.7.4 Design Guidance and Specifications CC-109 3.12.4 Design Guidance and Specifications CC-154 3.7.5 Inspection and Maintenance Requirements CC-109 3.12.5 Inspection and Maintenance Requirements CC-154 3.8 Pipe Inlet Sediment Trap CC-110 3.12.6 Example Schematics CC-154 3.8.1 Primary Use CC-111 3.13 Triangular Sediment Filter Dike CC-157 3.8.2 Applications CC-111 3.13.1 Primary Use CC-158 3.8.3 Design Criteria CC-111 3.13.2 Applications CC-158 3.8.4 Design Guidance and Specifications CC-112 3.13.3 Design Criteria CC-158 3.8.5 Inspection and Maintenance Requirements CC-112 3.13.4 Design Guidance and Specifications CC-159 3.8.6 Example Schematics CC-112 3.13.5 Inspection and Maintenance Requirements CC-159 3.9 Sediment Basin CC-115 3.13.6 Example Schematics CC-159 3.9.1 Primary Use CC-116 3.14 Turbidity Barrier CC-161 3.9.2 Applications CC-116 3.14.1 Primary Use CC-162 3.9.3 Design Criteria CC-116 3.14.2 Applications CC-162 3.9.4 Design Guidance and Specifications CC-119 3.14.3 Design Criteria CC-162 3.9.5 Inspection and Maintenance Requirements CC-120 3.14.4 Design Guidance and Specifications CC-163 3.9.6 Example Schematics CC-120 3.14.5 Inspection and Maintenance Requirements equirements CC-163 Construction Controls CC-iv Construction Controls CC-v Revised 04/10 Revised 04/10 iSW Mr'Technical Manual Construction Controls iSW Mr""Technical Manual Construction Controls 3.14.6 Example Schematics CC-163 4.4.1 Primary Use CC-192 3.15 Vegetated Filter Strips and Buffers CC-166 4.4.2 Applications CC-192 3.15.1 Primary Use CC-167 4.4.3 Design Criteria CC-192 3.15.2 Applications CC-167 4.4.4 Design Guidance and Specifications CC-194 3.15.3 Design Criteria CC-167 4.4.5 Inspection and Maintenance Requirements CC-194 3.15.4 Design Guidance and Specifications CC-169 4.5 Hyper-Chlorinated Water Management CC-195 3.15.5 Inspection and Maintenance Requirements CC-169 4.5.1 Primary Use CC-196 3.15.6 Example Schematics CC-169 4.5.2 Applications CC-196 3.16 Wheel Cleaning Systems CC-171 4.5.3 Design Criteria CC-196 3.16.1 Primary Use CC-172 4.5.4 Design Guidance and Specifications CC-198 3.16.2 Applications CC-172 4.5.5 Inspection and Maintenance Requirements CC-198 3.16.3 Design Criteria CC-172 4.6 Sandblasting Waste Management CC-199 3.16.4 Design Guidance and Specifications CC-173 4.6.1 Primary Use CC-200 3.16.5 Inspection and Maintenance Requirements CC-174 4.6.2 Applications CC-200 3.16.6 Example Schematics CC-174 4.6.3 Design Criteria CC-200 4.0 Material and Waste Controls CC-178 4.6.4 Design Guidance and Specifications CC-201 4.1 Chemical Management CC-178 4.6.5 Inspection and Maintenance Requirements CC-201 4.1.1 Primary Use CC-179 4.7 Sanitary Waste Management CC-202 4.1.2 Applications CC-179 4.7.1 Primary Use CC-203 4.1.3 Design Criteria CC-179 4.7.2 Applications CC-203 4.1.4 Design Guidance and Specifications CC 181 4.7.3 Design Criteria CC-203 4.1.5 Inspection and Maintenance Requirements CC-182 4.7.4 Design Guidance and Specifications CC-203 4.2 Concrete Sawcutting Waste Management CC-183 4.7.5 Inspection and Maintenance Requirements CC-203 4.2.1 Primary Use CC-184 4.8 Spill and Leak Response Procedures CC-204 4.2.2 Applications CC-184 4.8.1 Primary Use CC-205 4.2.3 Design Criteria CC-184 4.8.2 Applications CC-205 4.2.4 Design Guidance and Specifications CC 185 4.8.3 Design Criteria CC-205 4.2.5 Inspection and Maintenance Requirements CC-185 4.8.4 Design Guidance and Specifications CC-206 4.3 Concrete Waste Management CC-186 4.8.5 Inspection and Maintenance Requirements CC-206 4.3.1 Primary Use CC-187 4.9 Subgrade Stabilization Management CC-207 4.3.2 Applications CC-187 4.9.1 Primary Use CC-208 4.3.3 Design Criteria CC-187 4.9.2 Applications CC-208 4.3.4 Design Guidance and Specifications CC-189 4.9.3 Design Criteria CC-208 4.3.5 Inspection and Maintenance Requirements CC 189 4.9.4 Design Guidance and Specifications CC-208 4.3.6 Example Schematics CC-189 4.9.5 Inspection and Maintenance Requirements CC-209 4.4 Debris and Trash Management CC-191 4.9.6 Example Schematic CC-209 Construction Controls CC-vi Construction Controls CC-vii Revised 04/10 Revised 04/10 iSW Me"Technical Manual Construction Controls iSW Mr""Technical Manual Construction Controls 4.10 Vehicle and Equipment Management CC-210 Figure 2.4 Schematics of Organic Filter Tube Check Dams CC-19 4.10.1 Primary Use CC-211 Figure 2.5 Schematics of Diversion Dike CC-23 4.10.2 Applications CC-211 Figure 2.6 Schematics of Diversion Dike with Swale CC-24 4.10.3 Design Criteria CC-211 Figure 2.7 Schematics of Erosion Control Blankets CC-28 4.10.4 Design Guidance and Specifications CC-212 Figure 2.8 Anchor Examples for Erosion Control Blankets CC-29 4.10.5 Inspection and Maintenance Requirements CC-213 Figure 2.9 Schematics of Interceptor Swale CC-33 Figure 2.10 Schematics of Pipe Slope Drain CC-42 Figure 2.11 Schematics of Turf Reinforcement Mats CC-51 Figure 2.12 Examples of Turf Reinforcement Mat Anchoring CC-52 List of Tables Figure 2.13 Schematics of Velocity Dissipation Device CC-63 Table 1.1 Erosion Controls CC-2 Figure 3.1 Schematics of Active Treatment System CC-69 Table 1.2 Sediment Controls CC-3 Figure 3.2 Schematics of Depressed Grade(Curb Cut-Back)Sediment Trap CC-73 Table 1.3 Material and Waste Controls CC-4 Figure 3.3 Schematics of Depressed Pavement Replacement Sediment Trap CC-74 Table 1.4 Soil Erodibility Factors(K) CC-7 Figure 3.4 Schematics of Dewatering Controls CC-80 Table 1.5 Length/Slope Factor(LS) CC-8 Figure 3.5 Schematics of 2"x4"Weir Curb Inlet Protection CC-87 Table 1.6 Cropping Factors CC-9 Figure 3.6 Schematics of Organic Filter Tube Curb Inlet Protection CC-88 Table 2.1 Mulch Standards and Guidelines CC-36 Figure 3.7 Schematics of Hog Wire Weir Curb Inlet Protection CC-89 Table 2.2 Pipe Slope Drain Minimum Diameters CC-41 Figure 3.8 Schematics of Block and Gravel Filter Curb Inlet Protection CC-90 Table 2.3 NRCS Wind Erodibility Groups CC-44 Figure 3.9 Schematic of Organic Filter Tube On-Grade Curb Inlet Protection CC-91 Table 2.4 Recommended Grass Mixture for Temporary Erosion Control CC-56 Figure 3.10 Schematics of Filter Fabric Area Inlet Protection CC-92 Table 2.5 Recommended Grass Mixture for Final Stabilization of Upland in Rural Areas CC-57 Figure 3.11 Schematics of Excavated Impoundment Area Inlet Protection CC-93 Table 2.6 Recommended Grass Mixture for Final Stabilization of Upland in Urban Areas CC-57 Figure 3.12 Schematics of Block and Gravel Area Inlet Protection CC-94 Table 3.1 Perimeter Control Applications CC-102 Figure 3.13 Schematics of Organic Filter Tube Area Inlet Protection CC-95 Table 3.2 Maximum Spacing for Slope Protection CC-102 Figure 3.14 Schematics of Organic Filter Berm CC-99 Table 3.3 Sediment Basin Effectiveness for Different Soil Types CC-116 Figure 3.15 Schematics of Organic Filter Tubes CC-104 Table 3.4 Number and Spacing of Anti-Seep Collars CC-119 Figure 3.16 Examples of Organic Filter Tube Installation Methods CC-105 Table 3.5 Pipe Flow Chart,n=0.013 CC-130 Figure 3.17 Schematics of Type A Pipe Inlet Sediment Trap CC-113 Table 3.6 Pipe Flow Chart,n=0.025 CC-131 Figure 3.18 Schematics of Type B Pipe Inlet Sediment Trap CC-114 Table 3.7 Design Data for Earth Spillways CC-133 Figure 3.19 Schematics of Sediment Basin with Surface Skimmer CC-121 Table 3.8 Trash Rack and Anti-Vortex Device Design Table CC-138 Figure 3.20 Schematics of Sediment Basin with Overflow Riser CC-122 Table 3.9 Minimum Exit Dimensions CC-150 Figure 3.21 Schematics of Basin Embankment with Flashboard Riser CC-123 Table 3.10 Sizing of Vegetated Buffers and Strips CC-168 Figure 3.22 Schematic of Basin Embankment with Perforated Riser CC-124 Table 4.1 Chemical Dechlorination Agents and Approximate Dosages CC-197 Figure 3.23 Example of Basin Outlet Design CC-128 Figure 3.24 Riser Inflow Curves for Basin Outlet Design CC-129 Figure 3.25 Example of Excavated Earth Spillway Design CC-132 List of Figures Figure 3.26 Example of Anti-Vortex Design for Corrugated Metal Pipe Riser CC-137 Figure 3.27 Riser Pipe Base Design for Embankment Less Than 10 Feet High CC-139 Figure 2.1 Schematics of Rock Check Dams CC-16 Figure 3.28 Schematics of Silt Fence CC-147 Figure 2.2 Schematics of Rock Bag Check Dams CC-17 Figure 3.29 Schematics of Stabilized Construction Exit CC-151 Figure 2.3 Schematics of Sack Gabion Check Dams CC-18 Construction Controls CC-viii Construction Controls CC-ix Revised 04/10 Revised 04/10 iSW Mr'Technical Manual Construction Controls iSW Mr"Technical Manual Construction Controls Figure 3.30 Schematics of Excavated Stone Outlet Sediment Trap CC-155 Figure 3.31 Schematics ofBermedStoneOutletSedimentTrap CC-156 1.0 Overview of Construction Controls Figure 3.32 Schematics of Triangular Sediment Filter Dike CC-160 Figure 3.33 Example Application of Turbidity Barrier CC-164 1.1 Introduction Figure 3.34 Schematics of Turbidity Barrier CC-165 In order to address the requirements of pollution reduction at construction sites,a variety of controls Figure 3.35 Schematics of Vegetated Filter Strip CC-170 should be employed to reduce soil erosion,reduce sediment loss from the site,and manage construction- generated 3.36 Schematics of Rumble Rack Wheel Cleaning CC-175 generated waste and construction related toxic materials. Controls consist of both temporary and permanent methods to reduce pollution from a construction site. Figure 3.37 Schematics of Corrugated Metal Wheel Wash CC-176 The majority of controls address loss of soil from the site. Soil loss in the form of erosion and sediment Figure 3.38 Schematics of Flooded Basin Wheel Wash CC-177 due to storm events and wind constitute the majority of pollution generated from construction sites. Figure 4.1 Schematics of Concrete Washout Containment CC-190 Controls that address erosion and sediment are typically more site specific than waste and toxics management. Erosion and sediment controls are dependent on site slopes, drainage patterns and Figure 4.2 Schematic of Controls for Subgrade Stabilization CC-209 drainage quantities along with other site-specific conditions. Materials and waste management consists primarily of"good housekeeping"practices which are dependent on the type of construction and the quantity and type of building materials. 1.2 Control Selection Guide The designer preparing the iSWM Construction Plan can first use the control selection guide on the following pages to determine the controls that are most appropriate for the site. Chapters 2.0,3.0 and 4.0 contain the descriptions,design requirements,maintenance requirements,and limitations of the controls. These provide the tools for the designer to select the appropriate controls and properly locate them on the site to effectively reduce erosion and sediment loss. The Efficiency Ratings listed for the controls are the range of average efficiencies in reducing erosion or trapping sediment for the control,assuming the controls are properly designed,installed,and maintained for the flow and volumes from the design storm. The removal efficiency varies within in the range based on soil type. The Efficiency Ratings are useful in comparing the effectiveness of the controls. The ratings are also used in calculating the Site Rating,which is used by some municipalities to ensure adequate design of erosion and sediment controls. Refer to Section 1.3 Site Rating Calculations for additional details concerning the Efficiency Ratings and the methodology for calculating the Site Rating. The following legend applies to the Targeted Pollutants and Implementation Considerations presented for each of the controls: Legend • Significant Impact ✓ Medium Impact O Low Impact ? Unknown or Questionable Impact Construction Controls CC-x Overview CC-1 Revised 04/10 Revised 04/10 iSW M-r""Technical Manual Construction Controls iSW Mr"r Technical Manual Construction Controls 1.2.1 Erosion Controls Table 1.2 Sediment Controls These controls are the measures and techniques used to retain soil in place. They are installed on the Cmtra► Primary Rrpose Efficiency Rating(Fe) perimeter of the site to limit flow across disturbed areas and within the site to provide protective covering of disturbed areas that are not actively being worked. Erosion controls reduce the amount of soil removed and transported by stormwater runoff and reduce the need for sediment controls. Active Treatment Remove pollutants and suspended soil, including fine clay particles,through filtration 0.99 Table 1.1 Erosion Controls System and/or chemical-aided flocculation Cotstr f Depressed Grade Detain and settle suspended soil from small Primary Pt�pe6! Fmder[[y Rating(Fe) 0.50-0.75 Sediment Trap areas within rights-of-way Slow flow to prevent erosion of swales and 0.30-0.50 Remove suspended soil from water that is 0.50-0.75 Check Dam drainage ditches while also providing minor Dewatering Controls out of low points onsite detention and sediment removal (Depends on soil type) pumped p Route flows around slopes and disturbed Intercept sediment at curb and area inlets as Diversion Dike areas 0.95 Inlet Protection a secondary defense in sequence with other 0.35-0.65 Protect disturbed soil and slopes from erosion controls 0.65(Ground cover) Erosion Control using a degradable,rolled erosion control 0.65(Perimeter w/o Organic Filter Berm Slow and filter runoff to retain sediment 0.50-0.75 Blankets product;also provides limited protection as a vegetation) perimeter control Organic Filter Tubes Slow and filter runoff to retain sediment 0.50-0.75 Interceptor Swale areas flows around slopes and disturbed 0 95 Passive Treatment Improve performance of other controls by 0.85 Protect disturbed soil with a layer of straw, System adding flocculation agents to stormwater 0.75-0.90 Mulchin 9 wood chips,compost or other organic (Depends on coverage) Detain stormwater for sedimentation and material Pipe Inlet Protection filtration before it enters a closed conveyance 0.50-0.75 Pipe Slope Drain Route overland flow on a slope into a pipe to 0.95 system protect the slope Protect disturbed soil from wind erosion dust Detain stormwater in a pond with a controlled erosion(dust -0.90 Sediment Basin 0.50-0.90 Soil Surface control)while also providing some protection (Depends on type of outflow to allow for sedimentation Treatments from water erosion,depending on the treatment) Silt Fence Slow and filter runoff to retain sediment 0.50-0.75 treatment method Protect disturbed soil on steep slopes and in Stabilized Reduce offsite sediment tracking from trucks Turf Reinforcement channels from erosion using a non- 0.90 Construction Exit and construction equipment N/A Mats degradable,rolled erosion control product 0.90 Stone Outlet Sediment Intercept and filter small,concentrated flows 0.50-0.85 Prevent erosion by providing a natural cover (When fully established; Trap in swales and other defined waterways Vegetation through hydro-mulching,seeding or sod lower while vegetation is placement first growing) Triangular Sediment Filter Dike Slow and filter runoff to retain sediment 0.50-0.75 Velocity Dissipation Protect soil from erosion at points where Devices concentrated flows are discharged N/A Turbidity Barrier Detain and settle suspended soil where work 0.50-0.90 is occurring in or adjacent to a water body The Efficiency Ratings listed for the erosion controls are the assumed average efficiencies in reducing 0.35-0.85 erosion,based on the controls being designed for the flow and volume from the temporary control Vegetated Filter Strips Slow sheet flow from small areas to allow for (Depends on many design storm and installed in accordance with the criteria in this manual. and Buffers sedimentation conditions in addition to soil type) 1.2.2 Sediment Controls Wheel Cleaning Reduce offsite sediment tracking from trucks N/A These controls are temporary structures or devices that capture soil transported by stormwater through Systems and construction equipment sedimentation,filtration or chemical treatment of the runoff. They are used to trap sediment before it leaves the construction site. The effectiveness of controls that form a barrier or filter for trapping soil is The Efficiency Ratings listed for the sediment controls are the assumed average efficiencies in highly dependent on the size of soil particles. The efficiencies presented are ranges based on soil capturing sediment for a range of soil types,based on the controls being designed for the flow and types. The removal efficiency will be at the high end of the range for sand and coarse silt or loam and at volume from the temporary control design storm and installed in accordance with the criteria in this the low end for fine silt or loam and clay. Controls with a single number for the efficiency rating do not manual. vary in performance based on soil type. Overview CC-2 Overview CC-3 Revised 04/10 Revised 04/10 iSW V'm Technical Manual Construction Controls iSWM"'Technical Manual Construction Controls 1.2.3 Material and Waste Controls 1.3 Site Rating Calculation Material and waste control techniques are applicable on the majority of construction projects due to their general purpose of reducing the discharge of pollutants from construction activities. They form the basis of good housekeeping procedures that should be followed during construction and in many cases are 1.3.1 Introduction mandated by stormwater discharge permits. The techniques are essential to preventing the discharge of pollutants other than sediment from a construction site. The site rating calculation is a useful tool for evaluating the potential effectiveness of proposed erosion and sediment controls on a construction site. It is used to compare the potential soil loss from a site A numeric efficiency rating is not provided for material and waste controls,since the controls are not for without controls to the soil loss from the site with proposed controls. The site rating may also be used to erosion and sediment and are not a factor in the Site Rating calculation. All of these techniques are compare the effectiveness of two different controls on a site. highly effective in minimizing discharges of the targeted pollutants when properly applied. The site rating calculation is an optional element for an iSWM Construction Plan but may be required by Table 1.3 Material and Waste Controls some municipalities in North Central Texas. When required,a numeric site rating is established as the criteria for the design of erosion and sediment controls for a construction site. Municipalities that use the Control P r y Propose site rating will typically require a minimum site rating of 0.70,which reflects a realistic,attainable reduction in sediment loss from a construction site of 70 percent using controls compared to the same site without Techniques to minimize the exposure of paints,solvents,fertilizer, the use of controls. pesticides,herbicides,and other chemicals to precipitation and stormwater; The user of this manual is advised to confirm local requirements with the municipality where the project is Chemical Management q P Y ti t and techniques for managing the wastewater from washout of paint,form located. When required to provide the site rating by the local government,the iSWM Construction Plan release oils,curing compounds, and other construction chemicals should be prepared as described in Chapter 4 of the iSWM Criteria Manual,followed by calculation of the Concrete Sawcutting Techniques for collection and disposal of the slurry of cutting water and site rating. Controls shall then be modified and added as needed to achieve the minimum required site Waste Management concrete cuttings that results from concrete sawing rating. Concrete Management e Techniques for disposal of concrete washout,demolished concrete,etc. 1.3.2 Background The design and implementation of erosion and sediment controls is highly dependent on project site Techniques for storage and disposal of packaging,scrap building materials, Debris and Trash conditions and construction methods. The amount of potential soil loss from a site is based on the Management personal trash,and other wastes generated by construction activities and physical features and location of the site:soil type(s),slope,length of stormwater flow across the site,the personnel rainfall intensity and overall runoff quantity of a particular storm,and the groundcover of the site. Of these Hyper-Chlorinated Techniques to prevent water with high concentrations of chlorine from factors,construction activity at a site can affect the groundcover,the slope of the site and the length of Water Management being discharged stormwater flow across the site. These effects are mitigated by minimizing onsite disturbance of the soil and groundcover and providing structural measures to retain sediment onsite after erosion occurs. Sandblasting Waste Techniques for disposal of sandblasting waste and containment of wastes The most effective method to reduce sediment loss from a tract of land is to prevent the occurrence of Management during operations erosion. While structural barriers,such as those shown in this manual, have a theoretical 70 to 90 Sanitary Waste Techniques to control and prevent the exposure of sanitary waste to percent effectiveness rating for removal of sediment from runoff,natural groundcover and mulching can Management precipitation and stormwater provide up to 98 percent reduction in erosion and site soil loss. Therefore,the primary goals of the erosion control plan for a construction site is to prevent the soil from eroding and to minimize the area of Spill and Leak Techniques to minimize the discharge of pollutants from spills and leaks disturbance through the phasing of construction activities,mulching of disturbed but inactive areas,and Response Procedures providing tarps,seeding or hydromulching of stockpiles. These techniques are not only the most effective Subgrade Stabilization Techniques to control runoff from soil being chemically stabilized in at reducing soil loss; they are normally the most cost effective due to low initial cost and reduced Management preparation for construction maintenance requirements. Sediment removal controls provide the second line of defense by treating sediment-laden stormwater Vehicle and Techniques to prevent discharges of fluids used in vehicle and equipment before it is discharged from the site. All construction activities will require areas in which soil is disturbed. Equipment operation and maintenance and the discharge of wash waters that contain Stormwater runoff that crosses areas of exposed soil will require treatment by adequate Best Management soaps or solvents Management Practices in accordance with the guidelines presented in this manual. Sediment removal controls include diversion of stormwater around areas of construction,and filtration and sedimentation (detention)of sediment-laden runoff that crosses disturbed areas. 1.3.3 Methodology Site Rating Description The runoff across both disturbed and non-disturbed areas of a drainage basin produces a quantity of soil loss due to erosion. This quantity is estimated through the use of the Universal Soil Loss Equation as a Overview CC-4 Overview CC-5 Revised 04/10 Revised 04/10 iSW M'"Technical Manual Construction Controls iSW MT"Technical Manual Construction Controls mass per time period. Erosion and sediment controls are used to reduce the sediment transported Soil Erodibility Factor offsite. The soil erodibility factor,K,indicates the potential for water erosion of the soil. It is strongly suggested The site rating is defined as the theoretical amount of soil that remains uneroded and/or is captured on a that soil erodibility be determined as part of the geotechnical investigation of the site in order to determine site through the use of erosion and sediment controls(soil retained)divided by the theoretical amount of the most effective means to reduce site erosion. If a site has not been previously disturbed,the native soil that would leave the site if no controls were used(uncontrolled). A minimum site rating of 0.70 is soil type(s)most likely to be present at the site can be identified on the NRCS Web Soil Survey at: typically used as a guideline for the adequate design of erosion and sediment control systems. http://websoilsurvev.nres.gov/app/. The website also contains the soil erodibility factors for native soils. This site rating is calculated as follows: Consider the depth of grading activities when determining the soil erodibility factor. Soil type varies with SR= ZA„ri,,,d/ZAa,e,„aenw (1.1) depth. The surface soil may have a low erodibility factor,but the soil at a lower depth may have a high erodiblility factor when it is exposed by grading operations. where: Table 1.4 provides approximate values of K for various soil types and can be used in calculations if SR = Site Rating detailed data are not available. ZAreiemed = Soil uneroded and/or retained onsite by erosion prevention and sediment trapping practices(pounds/year) Table 1.4 Soil Erodibility Factors(K)* ZA,,,,w„wnee = Soil loss from site if no controls used TYPe K Note that the site rating calculation methodology assumes that the erosion and sediment control Sand 0.03 measures are correctly designed,installed,and maintained in accordance with the criteria in this manual to treat the volume of runoff from the 2-year,24-hour storm event,which is the regionally Fine Sand 0.14 defined design storm frequency for temporary control design. Loamy Sand 0.10 Universal Soil Loss Equation Sandy Loam 0.24 Several elements are involved in evaluating the potential for erosion of a site. Soil type,length of flow Loam 0.34 across the ground,slope of ground,rainfall intensity and groundcover play important roles in determining Silt Loam 0.42 if a site will produce excessive siltation downstream. The Universal Soil Loss Equation is used to Silt 0.52 determine the potential erodibility of a site. The Universal Soil Loss Equation(USLE)is expressed as: Sandy Clay Loam 0.25 Z = R*K*LS*C,*P (1.2) Clay Loam 0.25 where: Silty Clay Loam 0.32 Z = Rate of soil loss(tons per acre per year) Sandy Clay 0.13 R = Rainfall erosion factor(300 for North Texas) Silty Clay 0.23 K = Soil erodibility factor Clay 0.13—0.29 LS = Length/slope factor (Source:Standard Handbook of Environmental Engineering edited by Robert A.Corbin) C, = Cropping/management factor •Assuming 2%organic matter content. P = Erosion control practice Length/Slope Factor Calculate the anticipated yearly soil loss(ZA) The length-slope factor,LS,of the drainage basin may be changed through construction operations. A ZA= Z*A (1.3) reduction in slope or drainage length can significantly reduce the erosion potential of the drainage basin. where The length-slope factor considers the topographic features of the drainage basin. The LS factor is ZA = Soil loss per year(tons per year) defined by the length and slope that a drop of water will travel through the drainage basin from the farthest reach to the point of analysis. The slope value is the average slope of this path. Table 1.5 lists Z = Rate of soil loss for a drainage basin(tons per acre per year) values of LS for a wide variety of slope and drainage length. LS can also be calculated as follows: A = Area of drainage basin(acres) LS=[L172.61M 165.41*sirAS)+4.56*sin(S)+0.065] (1.4) Some of the factors above(R and K)remain constant throughout the construction of the project. Both the LS and C,factors are altered during construction through clearing,grading and drainage operations on where: the site. The P factor represents the implementation of erosion and sediment controls to reduce the L = Length of flow path of contributing area(feet) potential for sediment to be transported offsite. These factors are discussed in the following sections. M = 0.6 [1-exp(-35.835's)]where s=slope(feet/feet) Rainfall Erosion Factor S = Average slope of contributing area(degrees) The average annual rainfall erosion factor, R, varies for different regions throughout the country and during the year. This value accounts for the volume and intensity of rainfall for a one year time period in a region. A value of 300 is used for R in the North Central Texas area. Overview CC-6 Overview CC-7 Revised 04/10 Revised 04/10 ISWMT"'Technical Manual Construction Controls CO O CO 0)V N V M 00770)x0)rr)M r 7 o r[)r(O 0)0)0)0)0)(00)00 O 6 O m r V O O 7 r N CO V V V NCO V 00 N N O CO,0 O LO N N.-7 CO Cropping/Management Factor U NMM V N 6(o r r co 60.-N V 6 r 6 O.-V 66 ON,-0)M N ( Cl Cl Cl N Cl CO CO V V CO r m Q The cropping factor,C,,considers the protection of natural ground cover in preventing erosion of the soil. o This is dependent on the type of vegetation(grass or trees)and the density of the vegetation on the site. '? N (D 0,()M CO 0 O CO N 7 7 r 0)oo co V N r r h CO N N N V N r N V N The higher the value for C,the less protection from erosion is available;for example,a bare construction 0 0(oo v r en v m rn N CO CO Co Co,N7 m N M O M(n(o r oM M Cr,v m N(V N N CO CO CO V V,6 N 6 r co 6 0)o.-N M V o(6 vi N ro of site with no groundcover has a C value of 1.0,while hay mulch applied at 1 ton per acre produces a C o N N M M v value of 0.13. 0 V n 0)M N(!)M 0 Cl(D 0)0)m 0 m moo o M o The C,factor is not intended to account for the reduced erosion provided by temporary or final vegetation (o O Cl N o,-M v((0 o M(D 0 v)o v)0 v m N 0o (0 W'm M established on areas that have been disturbed. The erosion control factor,P,described below reflects o o Cl Cl N Cl M C)M M V 0 0 6 O 6 N.0 0)6 0(0 x 6 0 M r N Cl Cl the erosion protection afforded by use of vegetation in accordance with the Section 2.9 Vegetation. Table 1.6 provides approximate values for C,for a variety of conditions. The sensitivity of the C,value (• r m°m m g M e° ' °r rn m p v °(r, o.m o N o 0 r rn ° o . reflects the importance of minimizing the area of disturbance and providing protection to the disturbed soil O O O O O N N N N M M M V V V 6(6 Co 00 O =M before erosion occurs. For existing bare areas or areas stripped of natural vegetation by construction,a C,value of 1.0 shall be used. O O 2 0 N r N O O 8O(r V or o .O N N N,o N O O c,-0 O N N N,-0 0 Table 1.6 Cropping Factors O O o 000600000000 Cl Cl Cl Cl M V V N Type HeR. Ww oRe v,^,Ml Ground cover that ace %Vegetal r Cara,% j N V 0 O CO N CO 0M OO (0 N M 0 r M 0 N 0 0,r 0)CO 00 CO O .-NN V 0(000 r CO O7NM V hOOO M O)Mr Canopy O O O O 0 0 0 0 O O O O O O O 0 N Cl N M CO 0 20 40 60 80 95-100 No appreciable 0 0.450 0.200 0.100 0.042 0.013 0.003 lz O 0-O M r o Nor 0) -N 01 CO o N r N r 7 N N O(D 7 r O O MOM cano py/ NNNMMM MMV V V nn(D(o r r m m 0)m O v(ornN V 25 0.360 0.170 0.090 0.038 0.012 0.003 o o 000000000000000000000 NN Canopy of tall weeds or short 50 0.260 0.130 0.070 0.035 0.012 0.003 H brush(<1'tall) 75 0.170 0.100 0.060 0.031 0.011 0.003 M N(O 007N V 0r CO O N N IN O)N 0O.-V N0 V r 0 CO(Or M r Q) O 7 7 7NNNNNNMMMMMVVVNv)N(0N(00.rNm7 or!M Appreciable 25 0.400 0.180 0.090 0.040 0.013 0.003 O 000000000000000000000000000.-.-,- brush or bushes 50 0.340 0.160 0.085 0.038 0.012 0.003 (5'fall height) ss�� _ (p 75 0.280 0.140 0.080 0.036 0.012 0.003 N .-VO'MNNNNNNNM(N9(+,M(ODQa4Va2h2 r2Om Trees w/o 25 0.420 0.190 0.100 0.041 0.013 0.003 o' 000000dddd000000c00000000000do appreciable low 50 0.390 0.180 0.090 0.040 0.013 0.003 brush(>10'fall height) 75 0.360 0.170 0.090 0.039 0.012 0.003 N o N,r Lc,co r 0 0)o o N co V.r CO 0 7 N CO N r m 03 v-CO o r N r (Source:Standard Handbook of Environmental Engineering edited by Robert A.Corbitt) O N N N N N N N CO 0 0 0 0 M M M V V(0(0(0<0 01 O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 666666666 For each drainage basin,this C,value is weighted based on the percentage of disturbed area in the . basin: (l 0) N CO CO 0(DN(o(o r CO CO CD 7 N CO CO V N(O r00aON V NOM • O N N N N N N N N N N N M M M V V C,bW = ((C,un'Aun)+(Ca ,*A yl.)]/Amm (1.5)0 o 000000000000000000000000000000 0 where: 5. C„0,,; = C,for drainage basin lL C W0 o 0.-.-.-N N N N M M V V 40 N(O o(o r r oo co co co N N N N N C,u, = C,for undisturbed areas d o 000000000000000000000000000006 Au, = Area of undisturbed areas of drainage basin(acres) e C,,,, = C,for disturbed areas A4,, = Area of disturbed areas of drainage basin(acres) t n r w co w m o,0)o)0)0)0)0 0 0 0 0 0 Cl N N M co o. A,,,,, = Total area of drainage basin(acres) 0 0 0 0 0 o 0 0 0 0 0 0 To en 0000000000000000000000000000000 0 c o c J o f N o O O O O O O 0 000.0L000000000000000000 3 N M.,o(o r 000)ON. -0.0L00.00000000000 ill 0 2 7777NNO000.00000.0000 d a0 7 7 N M 0(0 N Im ' oa Overview CC-9 Revised 04/10 iSWMT"Technical Manual Construction Controls ISWMT"Technical Manual Construction Controls Erosion Control Practice Factor Total sediment loss from the site must be reduced by a minimum of 70 percent from uncontrolled conditions(Site Rating>0.70). The erosion control practice factor, P, accounts for the erosion control and sediment trapping effectiveness of land treatments such as mulching,erosion control blankets,temporary or final vegetation, For sites that include phasing of the construction,repeat the steps for each phase. sediment basins,filter berms,check dams,and other controls. For the, A P value of 1 is used in the USLE calculation of the uncontrolled soil loss from the site (ZAunco„„dw.)because it is assumed that no controls are used. The Efficiency Rating(F,)for the calculation of the soil erosion prevented/sediment retained on the site (ZA„m,a)for the various controls is used in place of the erosion control practice factor. The Efficiency Rating is the compliment of the P value(F,=1 -P)and is used instead of P,because the desired calculation is the soil retained on the site through the use of the practices rather than the soil lost from the site. When multiple structural controls are used in series to treat runoff from disturbed areas,the design efficiency can be calculated as follows': F.mrA1 = 1-((1-F.t)e(1-F.u)) (1.6) where. F,, = Removal efficiency of first control F,5= Removal efficiency of second control Site Rating Factor Calculation After erosion potential is calculated for both uncontrolled (ZAun„nt„lied) and controlled conditions (ZAre,e,ned),a site rating(SR)is calculated using Equation 1.1. A minimum design storm of 2-year intensity and 24-hour duration shall be used for design of structural sediment control techniques. Other design criteria are defined in sections of the manual for specific erosion controls. The 2-year intensity is the rainfall intensity that has a 50 percent probability of occurring in any given year. The 24-hour duration establishes the overall volume of rainfall and runoff of the storm with a peak flow of the referenced intensity. Municipalities can adjust this requirement for particularly sensitive areas or other areas of concern. 1.3.4 Summary The following outlines the primary steps required to calculate the Site Rating. I. Develop design storm flows. Determine drainage sub-basin. Determine C,values and drainage patterns(LS)based on conditions for design period. II. Calculate theoretical soil loss for each sub-basin if no controls are used. Use value of 1 for the Erosion Control Practice factor,P,since no controls are used. Ill. Calculate theoretical soil uneroded andlor retained for each sub-basin by use of controls. Use F. from Section 2.0 Erosion Controls and Section 3.0 Sediment Controls (or test/manufacturer's data)in place of P in USLE. Calculate soil retained onsite due to use of controls. IV. Determine site rating. Hartigan,P.and K.Wilweding,The Clean Colorado Project and Urban Nonpoint Source Pollution Control.The LCRA Program,Seminar Publication-Nonpoint Source Watershed Workshop,Environmental Protection Agency, Sept.1991,p.170. Overview CC-10 Overview CC-11 Revised 04/10 Revised 04/10 iSWM'Technical Manual Construction Controls iSWM'"Technical Manual Construction Controls 2.1.1 Primary Use 2.0 Erosion Controls Check dams are used in long drainage swales or ditches to reduce erosive velocities. They are typically used in conjunction with other channel protection techniques such as vegetation lining and turf 2.1 Check Dam reinforcement mats. Check dams provide limited treatment to sediment-laden flows. They are more useful in reducing flow velocities to acceptable levels for stabilization methods. Check dams may be Erosion Control used in combination with stone outlet sediment traps,where the check dams prevent erosion of the swale while the sediment trap captures sediment at the downstream end of the Swale. Flow Description: Check dams are small barriers consisting of loose rock,rock bags, or organic filter tubes placed 2.1.2 Applications ^— �� Spacing across a drainage swale or ditch. Check dams are typically used in swales and drainage ditches along linear projects such as roadways. 8"-38^ They reduce the velocity of small They can also be used in short swales down a steep slope, such as swales down a highway --'`"----- concentrated flows,provide a limited embankment,to reduce velocities. Check dams shall not be used in live stream channels. barrier for sediment and reduce the potential for erosion of the swale or Check dams should be installed before the contributing drainage area is disturbed,so as to mitigate the ditch. effects on the swale from the increase in runoff. If the swale itself is graded as part of the construction activities,check dams are installed immediately upon completion of grading to control velocities in the swale until stabilization is completed. KEY CONSIDERATIONS APPIJCATIONS DESIGN CRITERIA: r 2.1.3 Design Criteria Perimeter Control • Heights between 9 inches and 36 inches General Criteria • Top of the downstream dam should be at the same Slope Protection elevation the d the downstream re of the upstream dam Sediment Barrier Typically,the dam height should be between 9 inches and 36 inches,depending on the material of which they are made. The height of the check dam shall always be less than one-third the depth of ADVANTAGES/BENEFITS: Channel Protection the channel. • Reduced velocities in long drainage swales or ditches Temporary Stabilization • Dams should be spaced such that the top of the downstream dam is at the same elevation as the toe • May be used with other channel protection measures Final Stabilization of the upstream dam. On channel grades flatter than 0.4 percent,check dams should be placed at a distance that allows small pools to form between each check dam. • Provides some sediment removal Waste Management • The top of the side of the check dam shall be a minimum of 12 inches higher than the middle of the DISADVANTAGES/LIMITATIONS: Housekeeping Practices dam. In addition,the side of the dams shall be embedded a minimum of 18 inches into the side of the • Cannot be used in live stream channels drainage ditch,swale or channel to minimize the potential for flows to erode around the side of the • Minor ponding upstream of the check dams Fe=0^30.0^50 dam. • Extensive maintenance or replacement of the dams (Depends on soil type) • Larger flows(greater than 2-year,24-hour design storm)must pass the check dam without causing required after heavy flows or high velocity flows excessive upstream flooding. • Mowing hazard from loose rocks if all rock is not removed IMPIFMENTA770N at end of construction • Check dams should be used in conjunction with other sediment reduction techniques prior to CONSIDERATIONS releasing flow offsite. MAINTENANCE REQUIREMENTS: C Capital Costs • Use geotextile filter fabric under check dams of 12 inches in height or greater. The fabric shall meet • Inspect regularly the following minimum criteria: •approximately the height Maintenance • Remove silt when it reaches a o Pp y% 9 Tensile Strength, ASTM D4632 Test Method for Grab Breaking Load and Elongation of of the dam or 12 inches,whichever is less O Training Geotextiles,250-lbs. C Suitability for Slopes.>5%` o Puncture Rating, ASTM D4833 Test Method for Index Puncture Resistance of Geotextiles, TARGETED POLLUTANTS Other Considerations: Geomembranes,and Related Products,135-lbs. v Sediment None o Mullen Burst Rating, ASTM D3786 Standard Test Method for Hydraulic Bursting Strength of Textile Fabrics-Diaphragm Bursting Strength Tester Method,420-psi. o Nutrients&Toxic Materials o Apparent Opening Size,ASTM D4751 Test Method for Determining Apparent Opening Size of a O Oil&Grease Geotextile,U.S.Sieve No.20(max). G Floatable Materials • Loose,unconfined soil,wood chips,compost,and other material that can float or be transported by O Other Construction Wastes runoff shall not be used to construct check dams. Check Dam CC-12 Check Dam CC-13 Revised 04/10 Revised 04/10 iSW Mrm Technical Manual Construction Controls iSW Mm Technical Manual Construction Controls Rock Check Dams criteria in Section 3.6 Organic Filter Tubes. • Stone shall be well graded with stone size ranging from 3 to 6 inches in diameter for a check dam height of 24 inches or less. The stone size range for check dams greater than 24 inches is 4 to 8 2.1.4 Design Guidance and Specifications inches in diameter. Specifications for construction of this item may be found in the Standard Specifications for Public Works • Rock check dams shall have a minimum top width of 2 feet with side slopes of 2:1 or flatter. Construction — North Central Texas Council of Governments, Section 201.9 Check Dam (Rock). Specifications are also available in the Standard Specifications for Construction and Maintenance of Rock Bag Check Dams Highways,Streets,and Bridges(TxDOT 2004),Item 506.2.A and Item 506.4.C.1. • Rock bag check dams should have a minimum top width of 16 inches. • Bag length shall be 24 inches to 30 inches,width shall be 16 inches to 18 inches and thickness shall 2.1.5 Inspection and Maintenance Requirements be 6 inches to 8 inches and having a minimum weight of 40 pounds. Check dams should be inspected regularly(at least as often as required by the TPDES Construction • Minimum rock bag dam height of 12 inches would consist of one row of bags stacked on top of two General Permit). Silt must be removed when it reaches approximately 1/3 the height of the dam or 12 rows of bag. The dam shall always be one more row wide than it is high,stacked pyramid fashion. inches,whichever is less. Inspectors should monitor the edges of the dam where it meets the sides of the drainage ditch,swale or channel for evidence of erosion due to bypass or high flows. Eroded areas • Bags should be filled with pea gravel,filter stone,or aggregate that is clean and free of deleterious shall be repaired. If erosion continues to be a problem,modifications to the check dam or additional material. controls are needed. • Sand bags shall not be used for check dams,due to their propensity to break and release sand that is Care must be used when taking out rock check dams in order to remove as much rock as possible. transported by the concentrated flow in the drainage swale or ditch. Loose rock can create an extreme hazard during mowing operations once the area has been stabilized. • Bag material shall be polypropylene,polyethylene,polyamide or cotton burlap woven fabric,minimum unit weight 4-ounces-per-square-yard, Mullen burst strength exceeding 300-psi as determined by 2.1.6 Example Schematics ASTM D3786,Standard Test Method for Hydraulic Bursting Strength of Textile Fabrics-Diaphragm Bursting Strength Tester Method,and ultraviolet stability exceeding 70 percent. The following schematics are example applications of the construction control. They are intended to assist in understanding the control's design and function. • PVC pipes may be installed through the dam to allow for controlled flow through the dam. Pipe should be schedule 40 or heavier polyvinyl chloride(PVC)having a nominal internal diameter of 2 The schematics are not for construction. They may serve as a starting point for creating a construction inches. detail,but they must be adapted for the site by the designer. Dimensions and notes appropriate for the application must also be added by the designer. Sack Gabion Check Dams • Sack gabion check dams may be used in channels with a contributing drainage area of 5 acres or less. • Sack gabions shall be wrapped in galvanized steel,woven wire mesh. The wire shall be 20 gauge with 1 inch diameter,hexagonal openings. • Wire mesh shall be one piece,wrapped around the rock,and secured to itself on the downstream side using wire ties or hog rings. • Sack gabions shall be staked with'/,inch rebar at a maximum spacing of three feet. Each wire sack shall have a minimum of two stakes. • Stone shall be well graded with a minimum size range from 3 to 6 inches in diameter. Organic Filter Tube Check Dams • Organic filter tubes may be used as check dams in channels with a contributing drainage area of 5 acres or less. • Organic filter tubes shall be a minimum of 12 inches in diameter. • Filter material used within tubes to construct check dams shall be limited to coir,straw,aspen fiber and other organic material with high cellulose content. The material should be slow to decay or leach nutrients in standing water. • Staking of filter tubes shall be at a maximum of 4 foot spacing and shall alternate through the tube and on the downstream face of the tube. • Unless superseded by requirements in this section,filter tubes and filter material shall comply with the Check Dam CC-14 Check Dam CC-15 Revised 04/10 Revised 04/10 iSW Mr"'Technical Manual Construction Controls iSW MrN Technical Manual Construction Controls SAND BAG OR GRAVEL GAG S'-8B' 9'38• ,�% — l'/''/"" FILTER FABRIC FILTER FABRIC 2•DIA PVC ON 4 FT SPACING (MIN OF 2) ROCK CHECK DAM VIEW LOOKING UPSTREAM n.rs_ ROCK BAG CHECK DAM VIEW LOOKING UPSTRFA. N.T.S. 11.1 18°MIN 1 MAX(BOTH SIDES) 4 FT SPACING FLOW --�,� 2'DIA PVC ON —.47, irgrs�4"1 4t `\ ��, t at__4 t z,. FILTER FABRIC (MIN OF 2)FLOW I sF-ate FILTER FABRIC CROSS SECTION OF ROCK CHECK DAM e N.Tb. CROSS SECTION OF ROCK BAG CHECK DAM N.T.S. J trY E TOE OF CHECK DAM TOP OF CHECK DAM TOE OF L SAME ELEVATION ^' CHECK �'��\��V /V A C•"sh DAM TOP OF CHECK DAM \ice i\lVV\/ try 'r.S SAME !/7.2, .;C' ELEVATION ..,: SPACING BETWEEN ROCK CHECK DAMS N.T.B. NOTES:ACTUAL DIMENSIONS OF THE CHECK DAMS SHALL BE DESIGNED BASED ON FLOW SPACING BETWEEN ROCK BAG CHECK DAMS AS CONDITIONS IN THE DRAINAGE SWALE OR DITCH.PROVIDE CALCULATIONS THAT DOCUMENT THE N.TB, FOLLOWING PARAMETERS USED TO DESIGN THE CHECK DAMS. NOTES:ACTUAL DIMENSIONS OF THE CHECK DAMS SHALL BE DESIGNED BASED ON FLOW •HEIGHT OF CHECK DAMS BASED ON SWALE OR DITCH DIMENSIONS AND FLOW CONDITIONS. CONDITIONS IN THE DRAINAGE SWALE OR DITCH.PROVIDE CALCULATIONS THAT DOCUMENT THE FOLLOWING PARAMETERS USED TO DESIGN THE CHECK DAMS. •SPACING OF CHECK DAMS BASED ON GRADE OF THE SWALE OR DITCH.TOP OF DOWNSTREAM •HEIGHT OF CHECK DAMS BASED ON SWALE OR DITCH DIMENSIONS AND FLOW CONDmONS. DAM SHALL BE AT SAME ELEVATION AS TOE OF UPSTREAM DAM •SPACING OF CHECK DAMS BASED ON GRADE OF THE SWALE OR DITCH.TOP OF DOWNSTREAM DAM SHALL BE AT SAME ELEVATION AS TOE OF UPSTREAM DAM. Figure 2.1 Schematics of Rock Check Dams (Source:Modified from Stormwater Management Manual for Western Washington) Figure 2.2 Schematics of Rock Bag Check Dams Check Dam CC-16 Check Dam CC-17 Revised 04/10 Revised 04/10 iSW MTN Technical Manual Construction Controls iSW MTN Technical Manual Construction Controls SACK GABIONS DOWNSTREAM SIDE YxY WOOD FILTER TUBE OF FILTER TUBE STAKES MAX 4' (17 MIN THROUGH SPACING DIAMETER) FILTER �[// TUBE v ORGANIC FILTER TUBE CHECK DAM VIEW LOOKING UPSTREAM N.T.S. L Row TOE OF ORGANIC FILTER TUBE CHECK (17 MIN DIA.) DAM TOP OF SACK GABION CHECK DAM PLAN VIEW - NT.& (j CHECK - — is 0 DAM 3/4•DIA SEE EMBEDMENT REBAR •g IS — _ STAKES MAX DETAIL ______ SPACING B� A POINT B MIN.r ORGANIC FII TFR TURF CHFCK Dam PROFIT F ABOVE POINT A N.T.S. </ ,A.� V'' Y x Y WOOD STAKES THROUGH TUBE \-'\,� / (EXTEND Y MAX ABOVE TOP OF TUBE) SACK GABION CHECK DAM VIEW LOOKING UPSTREAM ORGANIC FILTER TUBE MAX 4'SPACING FOR ALL STAKES N.T.S. (17 MIN DIA).. 7 x 2•WOOD STAKES 4 DOWNSTREAM OF TUBE I FEW 9•-20•PER DESIGN ice'®ice vile n gie ntil 4a I� T S9 90 • D • ® � �))� CALCULATIONS ��E��a��d�� /,jam -3'EMBEDMENT MINIMUM 4444.:4444•;4406®4 ./-‘,/,,Or,/, "� 12•MINIMUM p p. p_q n_p.p. EMBEDMENT DETAIL FOR ORGANIC FILTER TUBE CHECK DAM N.T.S. GALVANIZED STEEL WIRE MESH NOTES:ACTUAL DIMENSIONS OF THE CHECK DAMS SHALL BE DESIGNED BASED ON FLOW TYPICAL SACK GABION CONDITIONS IN THE DRAINAGE SWALE OR DITCH.PROVIDE CALCULATIONS THAT DOCUMENT THE N,T.$. FOLLOWING PARAMETERS USED TO DESIGN THE CHECK DAMS. NOTES:ACTUAL DIMENSIONS OF THE CHECK DAMS SHALL BE DESIGNED BASED ON FLOW •HEIGHT OF CHECK DAMS BASED ON SWALE OR DITCH DIMENSIONS AND FLOW CONDITIONS. CONOn1ONS IN THE DRAINAGE SWALE OR DITCH.PROVIDE CALCULATIONS THAT DOCUMENT THE FOLLOWING PARAMETERS USED TO DESIGN THE CHECK DAMS. •SPACING OF CHECK DAMS BASED ON GRADE OF THE SWALE OR DITCH.TOP OF DOWNSTREAM DAM SHALL BE AT SAME ELEVATION AS TOE OF UPSTREAM DAM. •HEIGHT OF CHECK DAMS BASED ON SWALE OR DITCH DIMENSIONS AND FLOW CONDITIONS. •SPACING Of CHECK DAMS BASED ON GRADE OF THE SWALE OR DITCH.TOP OF DOWNSTREAM DAM SHALL BE AT SAME ELEVATION AS TOE OF UPSTREAM DAM. Figure 2.3 Schematics of Sack Gabion Check Dams Figure 2.4 Schematics of Organic Filter Tube Check Dams (Source:Modified from Texas Department of Transportation Detail Sheet EC(2)-93) (Source:Modified from City of Plano BMP S-T) Check Darn CC-18 Check Dam CC-19 Revised 04/10 Revised 04/10 iSW Mr'Technical Manual Construction Controls iSW Mru Technical Manual Construction Controls 2.3 Erosion Control Blankets 2.3.1 Primary Use Erosion control blankets(ECBs)are used to hold seed and soil in place until vegetation is established on Erosion Control disturbed areas. They can be used on many types of disturbed areas,but are particularly effective for slopes and embankments and in small drainage swales. ,�. Description: An erosion control blanket (ECB) is a temporary, ECBs seeded for vegetation may be used as a perimeter control. When used in combination with other 1 a degradable, rolled erosion control sediment bafflers,such as silt fence or organic filter tubes,blankets may be used as a perimeter control �°$ product that reduces soil erosion and with or without vegetation. ° assists in the establishment and -i-. '�✓ growth of vegetation. ECBs, also Q,3.2 Applications A' known as soil retention blankets, are pp Curb r �`A'�" manufactured by many companies ECBs may be used on many types of disturbed areas but are most applicable on gradual to steep(2:1) Street / " Erosion and are composed primarily of cut/fill slopes and in swales and channels with low to moderate flow velocities. In these applications they 1 Control processed, natural, organic materials may provide temporary stabilization by themselves or may be used with seeding to provide final r� x- -._. - /e° Blankets that are woven, glued, or structurally stabilization. ECBs are also used to establish vegetation in channels where velocities are less than 6.0 ........_._..........................__=-`,�- ,,.'-roe -'- -__ - �--�__'_-� bound together with natural fiber feet per second. netting or mesh on one or both sides. When seeded for establishment of vegetation,ECBs can be an effective perimeter along the down slope side of linear construction projects(roads and utilities). ECBs with vegetation are also used as perimeter KEY CONSIDERATIONS APPLICATIONS controls for new development,particularly at the front on residential lots in new subdivisions. ECBs are DESIGN CRITERIA: an effective aid in establishing vegetated filter strips. Perimeter Control • ECB selected based on slope,flow rate and length of Slope Protection service P 2.3.3 Design Criteria • Specify preparation of soil surface to ensure uniform Sediment Barrier • The designer shall specify the manufacturer, type of erosion control blanket to be used, and contact with blanket Channel Protection dimensioned limits of installation based on the site topography and drainage. • Installation and anchoring according to manufacturer's recommendations Temporary Stabilization • The type and class of erosion control blanket must be specified in accordance with the manufacturer's guidance for the slope of the area to be protected,the flow rate(sheet flow on cut/fill Final Stabilization slopes)or velocity of stormwater runoff in contact in with the ECB,and ADVANTAGES/BENEFITS: Y(concentrated flow in swales) • Holds seed and soil in place until vegetation i Waste Management the anticipated length of service. is established Housekeeping Practices • ECBs should meet the applicable"Minimum Performance Standards for TxDOT"as published by • Effective for slopes,embankments and small channels TxDOT in its "Erosion Control Report" and/or be listed on the most current annual "Approved Fe-0.90(Ground cover) Products List for TxDOT" applicable to TxDOT Item 169 Soil Retention Blanket and its Special DISADVANTAGES/LIMITATIONS: ( ) Provisions. • Not for use on slopes greater than 2:1 or in channels Fe=0.65 • ECBs shall be installed vertically down slope(across contours)on cut/fill slopes and embankments with shear stresses greater than 2.0 pounds per square (Perimeter w/o vegetation). and along the contours(parallel to flow)in swales and drainage ditches. foot • ECBs designed to remain onsite as part of final stabilization shall have netting or mesh only on one MAINTENANCE REQUIREMENTS: IMPLEMENTATION side(the exposed side)of the ECB. The ECB shall be installed with the side that does not have • Replace or re-anchor loosened blankets CONSIDERATIONS netting or mesh in contact with the soil surface. All materials in the ECB,including anchors,should be 100 percent biodegradable within three years. • Remove sediment deposited on blankets • Capital Costs Q Maintenance • On cut/fill slopes and drainage ditches or swales designed to receive erosion control blankets for temporary or final stabilization,installation of the ECBs shall be initiated immediately after completing TARGETED POLLUTANTS c Training grading of the slope or drainage way,and in no case later than 14 days after completion of grading •. Suitability for Slopes>.5% these features. Do not delay installation of ECBs on these highly-erodible areas until completion of • Sediment construction activities and stabilization of the remainder of the site. O Nutrients&Toxic Materials Other Considerations: • Unless the ECB is seeded to establish vegetation,perimeter control applications shall be limited to Life expectancy,partial thirty foot wide drainage areas(i.e.linear construction projects)for an 8 foot width of ECB. When O Oil&Grease seeded for vegetation,use of ECBs for perimeter control shall follow the criteria in the Section 3.15 degradation,and mowing/ Vegetated Filter Strips and Buffers. O Floatable Materials maintenance issues:for O Other Construction Waste ECBs left in place as part of • Prior to the installation of the ECB, all rocks, dirt clods, stumps, roots, trash and any other final stabilization obstructions that would prevent the ECB from lying in direct contact with the soil shall be removed. Erosion Control Blankets CC-25 Erosion Control Blankets CC-26 Revised 04/10 Revised 04/10 iSW Mr"Technical Manual Construction Controls iSW Mm Technical Manual Construction Controls • Anchor trenching shall be located along the top of slope of the installation area,except for small areas with less than 2 percent slope. • Installation and anchoring shall conform to the recommendations shown within the manufacturer's published literature for the erosion control blanket. Anchors(staples)shall be a minimum of 6 inches in length and 1 inch wide. They shall be made of 11-gauge wire,or equivalent,unless the ECB is intended to remain in place with final stabilization and biodegrade. REFER TO TOP OF SLOPE • Particular attention must be paid to joints and overlapping material. Overlap along the sides and at ANCHORING EXAMPLES the ends of ECBs should be per the manufacturer's recommendations for site conditions and the type of ECB being installed. At a minimum,the end of each roll of ECB shall overlap the next roll by 3 feet 3'MIN 4 INCH MINIMUM SIDE OVERLAP and the sides of rolls shall overlap 4 inches. ,�—�•"'�'� EROSION CONTROL BLANKET • After installation,the blankets should be checked for uniform contact with the soil,security of the lap " joints,and flushness of the staples with the ground. �? • When ECBs are installed to assist with establishing vegetation,seeding shall be completed before ` \ \ 3.MIN installation of the ECB. Criteria for seeding are provided in Section 2.9 Vegetation. • Turf Reinforcement Mats should be used instead of ECBs for permanent erosion control and for `� \ FLOW stabilizing slopes greater than 2:1. / �� \ ��HEE7 • ECBs are limited to use in swales and channels that have shear stresses of less than 2.0 pounds per %` ` square foot. Turf reinforcement mats shall be used in open channels with higher shear stresses. ; ' STAPLES(TYP.)12 INCH ON - ` CENTER AT END OF EC8 AND p Guidance \i ? (-2 THROUGHOUT ECB AT 2.3.4 Design Guidance and Specifications 3'MINIMUM OVERLAP AT ENDS ��A� 'N SPACINORECOMMENDEDBY 9 p OF BLANKETS.ECBAT HIGHER MANUFACTURER Specifications for construction of this item may be found in the Standard Specifications for Public Works ELEVATION SHALL OVERLAP ON Construction—North Central Texas Council of Governments,Section 201.15 Erosion Control Blankets 70P OF LOWER ECB. and in Item 169 of the Standard Specifications for Construction and Maintenance of Highways,Streets, ECB ISOMETRIC PLAN VIEW NT B. and Bridges(TxDOT,2004). ShEET 2.3.5 Inspection and Maintenance Requirements Erosion control blankets should be inspected regularly(at least as often as required by the TPDES 1 3 Construction General Permit)for bare spots caused by weather or other events. Missing or loosened t blankets must be replaced or re-anchored. t Check for excess sediment deposited from runoff. Remove sediment and/or replace blanket as necessary. In addition,determine the source of excess sediment and implement appropriate measures to control the erosion. Also check for rill erosion developing under the blankets. If found,repair the eroded area Determine the source of water causing the erosion and add controls to prevent its reoccurrence. STAPLE SPACING AS RECOMMENDED BY 2.3.6 Example Schematics MANUFACTURER The following schematics are example applications of the construction control. They are intended to assist in understanding the control's design and function. ECB OVERLAP EXAMPLE The schematics are not for construction. The designer is responsible for working with ECB N.T.S. manufacturers to ensure the proper ECB is specified based on the site topography and drainage. Installation measures should be dictated by the ECB manufacturer and are dependent on the type of ECB installed. Manufacturer's recommendations for overlap,anchoring,and stapling shall always be followed. Criteria shown here are applicable only when they are more stringent than those provided by the manufacturer. Figure 2.7 Schematics of Erosion Control Blankets Erosion Control Blankets CC-27 Erosion Control Blankets CC-28 Revised 04/10 Revised 04/10 iSW Mr"Technical Manual Construction Controls ISW Mrra Technical Manual Construction Controls 2.9 Vegetation Erosion Control FI OW" Description: Vegetation,used an erosion control, is the sowing g or sodding of grasses,is ses, small grains, or r legumes to provide temporary and n rn ¶ final vegetative stabilization for r ,n n ninf;', n R n-rt" _ _ disturbed areas. n, 3.MIN -"-- 1 ROW OF STAPLES, KEY CONSIDERATIONS APPLICATIONS 12'OC .. <'v7, ,,,-\/'''''\/ ' � �� DESIGN CRITERIA: Perimeter Control • Specify preparation of the soil surface before seeding N � y�x or sodding Slope Protection h`' �'� • Minimum of 4 to 6 inches of top soil required, \ ,� �s�f'J p q Sediment Barrier v depending on subsurface conditions ,..,,. P 9 Channel Protection • Specify soil amendments depending on soil conditions TOP OF SLOPE ANCHOR EXAMPLE 1 • Select seed or sod species appropriate for the climate, Temporary Stabilization N.T8 season,and soil Final Stabilization ADVANTAGES I BENEFITS: i Waste Management • More effective and easier to maintain than sediment Housekeeping Practices controls during a long construction period • May be used for temporary or final stabilization Fe=0.90. DISADVANTAGES/LIMITATIONS: (When fully established;lower 3 MN while vegetation is first growing) • Not appropriate for areas with heavy pedestrian, s' a vehicular traffic,or concentrated,high velocity flow • May require days to weeks for adequate establishment IMPLEMENTATION CONSIDERATIONS • Alternate erosion control is needed until vegetation is established G Capital Costs s' \' -' ' ��;. i Y CG,` C Maintenance Kv ''% .''f-` - MAINTENANCE REQUIREMENTS: ` ` ` `� �i /,/,--' �✓a✓ O Training Imo". \ %' • Inspect regularly 3't '' • Protect newly seeded areas from excessive runoff,high C Suitability for Slopes?6% STAPLE SPACING AS , �y �� velocity flow,and traffic until vegetation is established y p RECOMMENDED BY ��' • Water and fertilize until vegetation is established Other Considerations: MANUFACTURER TOP OF SLOPE ANCHOR EXAMPLE 2 • Reseed and/or provide mulch or another control for ▪ Design is uni ue fr soil and N.T.S. bare spots other conditions at each site • Rake accumulations of sediment from the vegetation NOTE:ANCHORING METHODS PROVIDED ARE EXAMPLES OF THE TYPE OF ANCHORING THE ECB • Watering and other MANUFACTURER MAY RECOMMEND.THERE ARE MORE THAN A DOZEN DIFFERENT TOP OF SLOPE maintenance required until ANCHORING METHODS BASED ON TYPE OF ECB,TYPE OF SOIL,SPECIFIED PERFORMANCE PERIOD, TARGETED POLLUTANTS vegetation is established SLOPE STEEPNESS,ETC.ALWAYS FOLLOW THE MANUFACTURER'S RECOMMENDATIONS FOR ANCHORING BASED ON THE SITE-SPECIFIC APPLICATION. • Sediment c Nutrients&Toxic Materials O Oil&Grease O Floatable Materials Figure 2.8 Anchor Examples for Erosion Control Blankets 0 Other Construction Wastes (Sources:American Excelsior Company and Western Excelsior Corporation) Erosion Control Blankets CC-29 Vegetation CC-53 Revised 04/10 Revised 04/10 iSW M"'Technical Manual Construction Controls iSW M'"Technical Manual Construction Controls 2.9.1 Primary Use • Interim or final grading must be completed prior to seeding or sodding. Vegetation is used as a temporary or final stabilization measure for areas disturbed by construction. As a • To minimize soil compaction of areas to be vegetated,limit vehicle and equipment traffic in these temporary control,vegetation is used to stabilize stockpiles,earthen dikes,and barren areas that are areas to the minimum necessary to accomplish grading. inactive for longer than two weeks. As a final control at the end of construction,grasses and other vegetation provide good protection from erosion along with some filtering for overland runoff. Subjected • Install all necessary erosion structures such as dikes,swales,diversions,etc. prior to seeding or to acceptable runoff velocities, vegetation can provide a positive method of long-term stormwater sodding. management as well as a visual amenity to the site. • Spread stockpiled topsoil evenly over the disturbed area to be vegetated. Other control measures may be required to assist during the establishment of vegetation. These other • Depth of topsoil shall be a minimum of 4 inches,with 6 inches required where the topsoil is over rock, controls include erosion control blankets,mulching,swales,and dikes to direct flow around newly seeded gravel or otherwise unsuitable material for root growth. After spreading stockpiled topsoil,provide areas and proper grading to limit runoff velocities during construction. additional top soil as needed to achieve these depths. • Compost Manufactured Topsoil as specified in TxDOT Special Specification 1001 may be used to 2.9.2 Applications achieve the specified depths or when it's infeasible to stockpile topsoil. Topsoil may also be acquired Vegetation effectively reduces erosion in channels and swales and on stockpiles, dikes, and mild to from another construction site if there is no space to stockpile the topsoil at that site. medium slopes. Vegetative strips can provide some protection and sediment trapping when used as a • Topsoil shall have an organic content of 10 to 20 percent using ASTM D2974 Standard Test Methods perimeter control for utility and site development construction. Refer to Section 3.15 Vegetated Filter for Moisture,Ash,and Organic Matter of Peat and Other Organic Soils. Strips and Buffers for more information. • Topsoil that does not meet the organic content requirement shall be amended with General Use In many cases, the initial cost of temporary seeding may be high compared to tarps or covers for Compost as specified in TxDOT Special Specification 1001. Amendment should be three parts of stockpiles or other barren areas subject to erosion. This initial cost should be weighed with the amount of topsoil to one part compost by volume thoroughly blended. time the area is to remain inactive, since vegetation is more effective and the maintenance cost for vegetated areas is much less than most structural controls. • Seed bed should be well pulverized and loosened to a minimum depth of 3 inches and then raked to have a uniform surface. 2.9.3 Design Criteria • When establishing vegetation from seed,groove or furrow slopes steeper than 3:1 on the contour line before seeding. General Plant Selection,Fertilization and Seeding • Vegetation is a highly effective erosion control when the vegetation is fully established. Until then, additional controls are needed. Sediment controls should not be removed from vegetated areas until • Use only high quality,USDA certified seed. the vegetation is established. • Use an appropriate species or species mixture adapted to the local climate,onsite soil conditions and • On grades steeper than 20:1(5 percent),anchored mulch or erosion control blankets are required to the season as shown below,or consult with the local office of the Natural Resource Conservation protect seeded areas until vegetation is established. Refer to Section 2.5 Mulching and Section 2.3 Service(NRCS)or Texas AgriLife Extension Service for selection of proper species and application Erosion Control Blankets for design criteria. technique in this area. • Vegetation may be used by itself for channel protection when the channel grade is less than 2 • Seeding rate should be in accordance with the Tables 2.4,2.5 and 2.6 as follow in this section or as percent and the temporary control design storm(2-year,24-hour)and the conveyance storm(25- recommended by the Natural Resources Conservation Service(NRCS)or Texas AgriLife Extension year,24-hour)flow velocities are less than 6 feet per second. Service. • If the velocity of the temporary control design storm is greater than 2 feet per second,erosion control ▪ Chemical fertilization is not recommended at the time of seeding,because it typically stimulates and blankets shall be used in the channel while vegetation is being established. Turf reinforcement mats is consumed by fast growing weeds that out-compete the slower growing grasses and legumes. If are required when the velocity exceeds 6 feet per second. Refer to Section 2.3 Erosion Control the topsoil has not been amended by compost as discussed above,an 0.5 inch layer of General Use Blankets and Section 2.8 Turf Reinforcement Mats for design criteria. Compost(TxDOT Special Specification 1001)is recommended as a surface treatment to protect the seed and provide slow release nutrients • Stabilization of channels with vegetation is limited to channels that have side slopes of 3:1 or flatter. • Evenly apply seed using a seed drill,cultipacker,terraseeding,or hydroseeder. • On cut/fill slopes and channels designed to receive temporary or final vegetation,establishment of • vegetation shall be initiated immediately after completing grading of the cut/fill slope or channel,and Hydra-seeding should not be used on slopes of 5:1 or steeper unless Bonded Fiber Matrix is used. in no case later than 14 days after completion of grading on these features. It is not acceptable to • Seeded areas shall be thoroughly watered immediately after planting. Water shall be applied at a delay establishing vegetation on these highly-erodible areas until completion of construction activities rate that moistens the top 6 inches of soil without causing runoff. Provide water daily for the first 14 and stabilization of the remainder of the site. days after seeding and thereafter as needed to aid in establishment of vegetation. Surface Preparation • Use appropriate mulching techniques(Section 2.5 Mulching)where necessary,especially during cold • Unless infeasible,remove and stockpile existing topsoil at the start of grading activities. Store topsoil periods of the year. Mulch consisting of chipped site vegetation is discouraged,since the wood in a series of small stockpiles instead of one large stockpile to decrease the loss of aerobic soil micro- content may result in depleting nitrogen from the soil. organisms during stockpiling. Vegetation CC-54 Vegetation CC-55 Revised 04/10 Revised 04/10 iSW Mt""Technical Manual Construction Controls iSW MT""Technical Manual Construction Controls Sodding • Use of sod should be limited to planned landscapes due to the relatively high water use of most types Table 2.5 Recommended Grass Mixture for Final Stabilization of Upland in Rural Areas of sod grass. ?Clay Seit <:SntdySob Date Spades and Pure Live Seed Rate and ae)broSeedRage • When sod is necessary to achieve immediate stabilization, buffalograss(Buchloe dactyloides) is (Lbs/Aae) (Lb//Ace) recommended. Other types of sod may be used in landscaping when specified by a landscape Erath architect for a commercial property or a homebuyer for a residential lot. Hood Green Sprangletop 0.3 Green Sprangletop 0.3 • The sod should be mowed prior to sod cutting so that the height of the grass shall not exceed 3 Johnson Sideoats Grama(El Reno) 2.7 Sand Lovegrass 0.5 inches and should not be harvested or planted when its moisture condition is so excessively wet or Palo Pinto February 1- Bermudagrass 0.9 Bermudagrass 1.8 dry that its survival shall be affected. Parker May 15 Little Bluestem(Native) 1.0 Weeping Lovegrass(Ermelo) 0.8 Somervell Blue Grama(Hachita) 0.9 Sand Dropseed 0.4 • Sod shall have a healthy,virile,system of dense,thickly matted roots throughout a minimum soil Tarrant Illinois Bundleflower 1.0 Partridge Peal 1.0 thickness of 0.75 inch. Wise • Sod shall be planted within 3 days after it is excavated. Collin Green Sprangletop 0.3 Green Sprangletop 0.3 Dallas Bermudagrass 1.2 Bermudagrass 1.8 • In areas subject to direct sunlight,pre-moisten prepared sod bed by watering immediately prior to Denton placing sod. Ellis Februar y ( ) p g Lovegrass- Sideoats Grama(El Reno 2.7 Wee In Love rass(Ermelo) 0.6 Kaufman May 15 Little Bluestem(Native) 2.0 Sand Lovegrass 0.6 • Sodded areas shall be thoroughly watered immediately after they are planted. Navarro Buffalograss(Texoka) 1.6 Sand Dropseed 0.4 Temporary Vegetation Rockwell Illinois Bundleflower 1.0 Partridge Pea 1.0 The following table lists recommended plant species for the North Central Texas region depending on the Green Sprangletop 0.3 Green Sprangletop 0.3 Bermudagrass 1.5 season for planting. February 1- Sideoats Grama(El Reno) 3.2 Bahiagrass(Per sacola) 6.0 Hunt Bermudagrass 1.8 May 15 Little Bluestem(Native) 1.7 Sand Lovegrass 0.6 Table 2.4 Recommended Grass Mixture for Temporary Erosion Control Illinois Bundleflower 1.0 Weeping Lovegrass(Ermelo) 0.8 Partridge Pea 1.0 Pure Lhe Season Common Nib (�/�d (Source:TeDOT Standard Specifications for Construction and Maintenance of Highways,Streets and Bridges,Item 164) Tall Fescue 4.5 Table 2.6 Recommended Grass Mixture for Final Stabilization of Upland in Urban Areas Clay Solis Sandy Sobs Sep 1-Nov 30 Westem Wheat Grass 5.6 Canty Planting Wheat(Red,Winter) 34.0 Loft S�� Seed Rate �� (Lblf/Acre) '(1b5/Acre) >; May 1-Aug 31 Foxtail Millet 34.0 Erath Feb 15-May 31 Hood Sep 1-Dec 31 Annual Rye 20.0 Johnson Green Sprangletop 0.3 Green Sprangletop 0.3 Palo Pinto February 1- Sideoats Grama(El Reno) 3.6 Sideoats Grama(El Reno) 3.6 Parker May 15 Bermudagrass 2.4 Bermudagrass 2.1 Areas receiving temporary seeding and vegetation shall be landscaped,re-seeded or sodded with Somervell Buffalograss(Texoka) 1.6 Sand Dropseed 0.3 perennial species to establish final vegetation at the end of construction. Tarrant Vegetation for Final Stabilization Wise Collin Sodding or seeding may be used to establish vegetation for final stabilization of areas disturbed by Dallas Green Sprangletop 0.3 Green Sprangletop 0.3 construction activity. The vegetation must achieve a cover that is 70 percent of the native background Denton 3.6 Buffalograss Rena)(El February 1- Sideoats Grama 3 (rexoka) 1.6 vegetative cover to be considered final stabilization. Sod will achieve this coverage quicker than seeding; Ellis May 15 Buffalograss Grama(El 3.6 Bermudagrass 3.6 however,sod is usually more expensive than seeding. Sod is most cost-effective for small areas or areas Kaufman Bermudagrass 2.4 Sand Dropseed 0.4 of concentrated flow or heavy pedestrian traffic where it will be difficult to establish vegetation by seeding. Navarro Grass seed for establishing final stabilization can be sown at the same time as seeding for temporary Rockwell _ annual vegetation. Drought tolerant native vegetation is recommended rather than exotics as a long- Green Sprangletop 0.3 (annual) 9 9 9 9- February 1- Green Sprangletop 0.3 term water conservation measure. Native grasses can be planted as seed or placed as sod. Buffalo 609, Hunt May 15 Bermudagrass 2.4 Bermudagrass 5.4 for example,is a hybrid grass that is placed as sod. Fertilizers are not normally used to establish native Sideoats Grama(Haskell) 4.5 grasses,but mulching is effective in retaining soil moisture for the native plants. (Source:TxDOT Standard Specifications for Construction and Maintenance of Highways,Streets and Badges,Item 164) Vegetation for final stabilization of channels requires grasses that are tolerant of periodic inundation,such as Bermuda grass,Kentucky bluegrass or a grass-legume mixture. Vegetation CC-56 Vegetation CC-57 Revised 04/10 Revised 04/10 iSWM r"Technical Manual Construction Controls iSWM'Technical Manual Construction Controls Additional Considerations deposited by runoff should be removed to prevent smothering of the vegetation. In addition,determine the source of excess sediment and implement appropriate measures to control the erosion. • Conditions for establishing vegetation vary significantly from site to site. Therefore,specifics of the vegetation design should be prepared based on the soil,slopes,drainage patterns,and the purpose of the vegetation at a each site. • For construction activities that include landscaping in the development plans,the landscape architect should be consulted when specifying vegetation for temporary or final stabilization of disturbed areas. • Vegetation is easier to establish if equipment and vehicle traffic is managed onsite to minimize soil compaction by traffic in the disturbed area that will be vegetated. • Establishing a good vegetative cover is dependent on the season of the year. Projects that commence in the fall of the year may not be candidates for using vegetation as an erosion control. • Where vegetation is used in swales and channels it may be necessary to use sod, rather than seeding,to establish an erosion resistant surface that accommodates rainfall runoff flows. • Mulch should be used to enhance vegetative growth,in that mulch protects seeds from heat,prevents soil moisture loss,and provides erosion protection until the vegetation is established. Compost mulch has the additional benefit of providing some slow-release nutrients. • Fertilizers have both beneficial and adverse effects. Fertilizers provide nutrients to the vegetation,but fertilizers are also a source of unwanted nutrients in streams and lakes. In this latter regard,they are a pollutant. The use of native vegetation rather than exotics reduces the need for fertilizers. Organic fertilizers,such as compost mulch,are generally preferred over chemical fertilizers. They provide a slow release of nutrients over a longer period of time and are less likely to cause environmental problems. • Steep slopes represent a problem for establishing vegetation. Hydraulic mulches are useful for establishing vegetation on slopes. Refer to Section 2.5 Mulching. 2.9.4 Design Guidance and Specifications Additional criteria for the application of vegetation in channels are in Section 3.6.3 of the iSWM Criteria Manual and design guidance is in Section 3.2 of the Hydraulics Technical Manual. Specifications for construction of this item may be found in the Standard Specifications for Public Works Construction — North Central Texas Council of Governments, Item 202 Landscaping. Additional specifications for the following components of this item are in the Standard Specifications for Construction and Maintenance of Highways,Streets,and Bridges(TxDOT 2004): • Topsoil,Item 160. • Compost,Item 161. • Sodding for Erosion Control,Item 162. • Seeding for Erosion Control,Item 163. • Fertilization,Item 164. • Vegetative Watering 165. 2.9.5 Inspection and Maintenance Requirements Protect newly seeded areas from excessive runoff and traffic until vegetation is established. Include a watering and fertilizing schedule in the iSWM Construction Plan facilitate the establishment of the vegetation. Vegetation for final stabilization must be maintained until the vegetative cover is 70 percent of the native background vegetative cover. Vegetation should be inspected regularly(at least as often as required by the TPDES Construction General Permit)to ensure that the plant material is established properly and remains healthy. Bare spots shall be reseeded and/or protected from erosion by mulch or other measures. Accumulated sediment Vegetation CC-58 Vegetation CC-59 Revised 04/10 Revised 04/10 iSW Mm Technical Manual Construction Controls iSW M'"Technical Manual Construction Controls 3.4 Inlet Protection 3.4.1 Primary Use Sediment Control Inlet protection is typically used as a secondary sediment barrier,due to its limited effectiveness and Description: Inlet protection consists numerous disadvantages. It is used to reduce sediment in storm sewer systems by serving as a back-up I of a variety of methods to intercept system for areas that have newly applied erosion controls or for other sediment controls that cannot Concrete block;or other dam device Oe sediment at low point inlets through achieve adequate sediment removal by themselves. ` may, the use of depressed grading, filter Inlet protection may be used as a primary sediment control only when all other primary controls are 14 �C stone,filter fabric,inlet inserts,organic infeasible because of site configuration or the type of construction activity. „ cam. PN('' ng filter tubes and other materials. The I protection devices are placed around Sediment P° r�� Compacted Soy or across the inlet openings to provide 3.4.2 Applications area(1'Mm,7 max �, localized detention or filtration of Inlet protection is best applied at low point(sump)inlets where stormwater runoff will pond behind the Outran sediment and fl tect oln deicematerials in protection measure,and then either filter through the protection.measure or flow over a weir created b it Cross Section stormwater. Protection devices may P 9 P Y ' be assembled onsite or purchased as Most inlet protection measures depend on ponding to be effective. These types of inlet protection are not manufactured assemblies. applicable to on-grade curb inlets,where the inlet protection will cause stormwater runoff to bypass the inlet and overload downstream inlets. Only inlet protection measures that allow for use of the inlet KEY A1fONS APP�j pNS opening(e.g.inlet inserts)are applicable as inlet protection for on-grade inlets. DESIGN CRITERIA: Inlet protection is normally used in new developments with new inlets and roads that are not in public use. Perimeter Control It has limited applications in developed areas due to the potential for flooding,traffic safety,pedestrian • Evaluate drainage patterns to ensure inlet protection will not Slope Protection safety,and maintenance problems. Potential applications in developed areas are on parking lot inlets cause flooding of roadway,property or structures where water can pond without causing damage and during major repairs to existing roadways where no • Never block entire inlet opening I Sediment Barrier other controls are viable. • Size according to drainage area and flow rates Channel Protection • Include flow bypass for clogged controls and large storm The application of inlet protection is highly variable due to the wide variety of inlet configurations(existing Temporary Stabilization and new) and site conditions. The schematics in Section 6 show example applications; however, events ) P PP Final Stabilization applications in most cases must be site adapted. Different methods and materials may be used. It is the ADVANTAGES/BENEFITS: responsibility of the designer to ensure that the methods and materials applied for inlet protection are Waste Management appropriate to the site and flow conditions following the design criteria in Section 3. • May be the only feasible sediment control when all 9 9 construction is located within rights-of-way Housekeeping Practices DISADVANTAGES/LIMITATIONS: Fe=O.35-0.65 3.4.3 Design Criteria • Limited effectiveness and reliability (Depends on soil.type) General • High maintenance requirements • Has potential to flood roadways or adjacent properties IMPWffMAIION • Drainage patterns shall be evaluated to ensure inlet protection will not divert flow or flood the roadway CONSIDERATIONS or adjacent properties and structures. MAINTENANCE REQUIREMENTS: Inlet protection measures or devices that completed block the inlet are prohibited. They must also• • Inspect regularly G Capital Costs P 9 Y include a bypass capability in case the protection measures are clogged. • Check for and remove blockage of inlet after every storm event I Maintenance • Remove sediment before it reaches half the design height or • Inlet protection must be designed to pass the conveyance storm(25-year,24-hour)without creating a volume of the inlet protection,more frequently for curb Inlets O ;Training road hazard or damaging adjacent property. This may be accomplished by any of the following • Repair or replace damaged materials 0 Suitability for Slopes>5% measures: • Clean or replace filter stone and organic filter tubes is when ' o An overflow weir on the protection measure. clogged with sediment Other Considerations: • Traffic hazards o An existing positive overflow swale on the inlet. TARGETED POLLUTANTS • Passage()Harper storm events o Sufficient storage volume around the inlet to hold the ponded water until it can all filter into the without causing flooding inlet. G Sediment Flow diversion to other inlets or o Other engineered method. O Nutrients&Toxic Materials ?drainage points • Positive overflow drainage is critical in the design of inlet protection. If overflow is not provided for at O Oil 8 Grease the inlet, temporary means shall be provided to route excess flows through established swales, G Floatable Materials streets,or other watercourses to minimize damage due to flooding. O Other Construction Wastes • Filter fabric and wire mesh used for inlet protection shall meet the material requirements specified in Section 3.10 Silt Fence. Inlet Protection CC-81 Inlet Protection CC-82 Revised 04/10 Revised 04/10 iSW M'"Technical Manual Construction Controls iSW MrM Technical Manual Construction Controls • Block and gravel(crushed stone or recycled concrete)protection is used when flows exceed 0.5 o If a board is used to anchor the wire mesh and fabric instead of rock bags,the board shall be cubic feet per second and it is necessary to allow for overtopping to prevent flooding. secured with concrete nails at 3 inches on center. Upon removal clean any dirt or debris from the • The tube and filler for organic filter tubes shall be in accordance with the criteria in Section 3.6 nailing locations,apply chemical sanding agent,and apply non-shrink grout flush with surface of Organic Filter Tube. concrete. • Bags used to secure inlet protection devices on pavement shall be filled with aggregate,filter stone, • Block and Gravel Protection: or crushed rock that is less likely than sand to be washed into an inlet if the bag is broken. Filled o Concrete blocks shall be standard 8 inch x 8 inch x 16 inch concrete masonry units and shall be bags shall be 24 to 30 inches long,16 to 18 inches wide,and 6 to 8 inches thick. Bags shall be in accordance with ASTM C139,Concrete Masonry Units for Construction. Filter gravel shall be polypropylene,polyethylene,or polyamide woven fabric with a minimum unit weight of 4 ounces per 1u inch washed stone containing no fines. Angular shaped stone is preferable to rounded shapes. square yard and meet the following criteria: o Concrete blocks are to be placed on their sides in a single row around the perimeter of the inlet, o Greater than 300 psi Mullen Burst Strength using ASTM D3786 Standard Test Method for with ends abutting. Openings in the blocks should face outward,not upward.%inch x V inch Hydraulic Bursting Strength of Textile Fabrics-Diaphragm Bursting Strength Tester Method. wire mesh shall then be placed over the outside face of the blocks covering the holes. Filter Greater than 70 percent UV Stability using ASTM D4355 Standard Test Method for Deterioration gravel shall then be piled against the wire mesh to the top of the blocks with the base of the stone o being a minimum of 18 inches from the blocks. of Geotextiles by Exposure to Light,Moisture,and Heat in a Xenon Arc Type Apparatus. o Alternatively,where loose stone is a concern(streets,etc.),the filter gravel may be placed in Curb Inlet Protection appropriately sized filter fabric bags. • Municipality approval is required before installing inlet protection on public streets. o Periodically,when the gravel filter becomes clogged,the gravel must be removed and cleaned in • Special caution must be exercised when installing curb inlet protection on publicly traveled streets or a proper manner or replaced with new gravel and piled back against the wire mesh. in developed areas. Ensure that inlet protection is properly designed,installed and maintained to • Organic Filter Tube On-Grade Protection: avoid flooding of the roadway or adjacent properties and structures. o Organic filter tubes may be used to provide sediment control at on-grade curb inlets where the • A two inch overflow gap or weir is required on all curb inlet protection devices. tube will not be a traffic hazard,such as on residential streets where the pavement adjacent to • Traffic cones,warning signs,or other measures shall be installed to wam motorists when the inlet the curb is allocated to parked cars. Tubes should not be used in this manner where they will protection measures extend beyond the gutter line. extend into an active travel lane. o The filter tube shall be secured in a U-shape by rock bags. Runoff flowing in the gutter will pond • 2 inch X 4 inch Weir Protection: within the U until it filters through the tube or overflows around the end. o Bend wire mesh around the 2 inch x 4 inch board and staple to the board. Bend wire mesh • Inlet protection shall be phased on curb inlets being constructed. Controls shall be installed on the around the bottom of the board,the curb opening,and along the pavement to form a cage for the pipe inlet at the bottom of the catch basin as soon as it is installed and while the inlet box and top are rock. being formed or placed. o Rock bags shall be placed perpendicular to the curb,at both ends of the wooden frame,to disrupt Area Inlet Protection the flow and direct water into the rock filter. Stack the bags two high if needed. • Organic Filter Tube Protection: • Installation methods for protection on area inlets vary depending on the type of inlet(drop,"Y,"or other)and the type and use of the surface surrounding the inlet(parking lot,playground,etc.). It is o The diameter of the tube shall be at least 2 inches less than the height of the inlet opening. The the responsibility of the designer to appropriately adapt inlet protection measures and their installation tube should not be allowed to block the entire opening,since it will clog. methods for each site condition. Several types may be needed on one project. o The tube shall be placed on 4 inch x 4 inch or 2 inch x 4 inch wire mesh to prevent the tube • Filter Fabric Protection: from sagging into the inlet. o Filter fabric protection is appropriate where the drainage area is less than one acre and the basin o The tube should be long enough to extend a minimum of 12 inches past the curb opening on slope is less than five(5)percent. Filter fabric,posts,and wire mesh shall meet the material each side of the inlet. requirements specified in Section 3.10 Silt Fence. • Hog Wire Weir Protection: o A 6 inch wide trench is to be cut 6 inches deep at the toe of the fence to allow the fabric to be laid o The filter fabric and wire mesh shall extend a minimum of 12 inches past the curb opening on below the surface and backfilled with compacted earth or gravel. This entrenchment prevents each side of the inlet. any bypass of runoff under the fence. o Filter fabric shall be placed on 2 inch x 4 inch wire mesh to prevent the tube from sagging into the o Stone overflow structures,according to the criteria in Section 3.10 Silt Fence shall be installed inlet. where flow to the inlet is concentrated and more than 1 cubic feet per second. o Rock bags are used to hold the wire mesh and filter fabric in contact with the pavement.At least • Excavated Impoundment Protection: one bag shall be placed on either side of the opening,parallel to and up against the concrete o Excavated inlet protection is usually the most effective type of area inlet protection;however,it is curb. The bags are in intended to disrupt and slow the flow and ensure it does not go under the only applicable to drop inlets. It should not be applied to Y inlets because it will undermine the fabric. Add bags if needed. concrete pad surrounding the inlet opening. Nor can it be used for inlets on pavement. Inlet Protection CC-83 Inlet Protection CC-84 Revised 04/10 Revised 04/10 iSW Mr'Technical Manual Construction Controls iSW Mr"Technical Manual Construction Controls o With this protection method,it is necessary to install weep holes to allow the impoundment to These types of inserts are recommended in applications where prior or current land use in or adjacent drain completely. to the construction areas may result in the discharge of pollutants. o The impoundment shall be sized such that the volume of excavation is equal to or exceeds the • Proprietary protection devices shall be in accordance with the General criteria at the beginning of this runoff volume from the temporary control design storm(2-year,24-hour)for the inlet's drainage section and any criteria listed under Curb Inlet Protection and Area Inlet Protection that are not area. specific to an inlet protection method. o The trap shall have a minimum depth of one foot and a maximum depth of 2 feet as measured from the top of the inlet and shall have side slopes of 2:1 or flatter. 3.4.4 Design Guidance and Specifications • Block and Gravel Protection: Specifications for construction of this item may be found in the Standard Specifications for Public Works o Block and gravel inlet protection is the most stable area inlet protection and can handle more Construction—North Central Texas Council of Governments,Section 201.15 Inlet Protection. concentrated flows. It may be installed on paved or vegetated surfaces. Loose stone shall be carefully removed from vegetated surfaces at the end of construction to prevent the stone from 3.4.5 Inspection and Maintenance Requirements becoming a mowing hazard. p p o The inlet protection may be one or two blocks high. Single block heights are applicable for Inlet protection should be inspected regularly(at least as often as required by the TPDES Construction drainage areas protection to 3 acres in size.two double high. Single shall be used for larger applicable General Permit). Inlet controls should also be inspected after every storm event to check for collapse into the inlet or other damages that may block flow in the inlet. In addition to routine inspection, inlet areas. protection devices should be observed and monitored during larger storm events to verify that they are o Concrete blocks shall be standard 8 inch x 8 inch x 16 inch concrete masonry units and shall be not ponding or diverting water in a manner that floods a roadway or damages property. in accordance with ASTM C139,Concrete Masonry Units for Construction. Filter gravel shall be Floatable debris and other trash caught by the inlet protection should be removed after each storm event. 3/4 inch washed stone containing no fines. Angular shaped stone is preferable to rounded shapes. Sediment should also be removed from curb inlet protection after each storm event because of the limited • Organic Filter Tube Protection: storage area associated with curb inlets. o Organic filter tubes may be used on paved or unpaved surfaces. Sediment collected at area inlet protection should be removed before it reaches half the height of the protection device. Sediment should be removed from inlets with excavated impoundment protection o On paved surfaces,tubes shall be secured in place by rock bags. On unpaved surfaces,the before the volume of the excavation is reduced by 50 percent. In addition,the weep holes should be tubes shall be embedded in the ground a minimum of 3 inches and staked at 4 foot spacing. checked and kept clear of blockage. o Designer shall provide calculations and specify the diameter of tube to be used based on the Concrete blocks,2 inch x 4 inch boards,stakes,and other materials used to construct inlet protection inlet's drainage area and the flow rate of runoff to the inlet. The minimum allowable diameter is should be checked for damaged and repaired or replaced if damaged. 12 inches. When filter fabric or organic filter tubes are used,they should be cleaned or replaced when the material Proprietary Inlet Protection becomes clogged. For systems using filter stone,when the filter stone becomes clogged with sediment, • Numerous proprietary protection devices are available from commercial vendors.The devices often the stones must be pulled away from the inlet and cleaned or replaced. have the advantage of being reusable on several projects if they are maintained in good condition. Because of the potential for inlet protection to divert runoff or cause localized flooding, remove inlet • It is the policy of this manual not to recommend any specific commercial vendors for proprietary controls. protection as soon as the drainage area contributing runoff to the inlet is stabilized. Ensure that all inlet protection devices are removed at the end of the construction. However,this subsection is included in order to provide municipalities with a rationale for approving the use of a proprietary inlet protection device within their jurisdiction. • The designer shall work with the supplier to provide the municipality with flow calculations or 3.4.6 Example Schematics independent third-party tests that document the device's performance for conditions similar to the The following schematics are example applications of the construction control. They are intended to ones in which it is proposed to be installed. The conditions that should be considered include:type assist in understanding the control's design and function. and size of inlet,inlet configuration,size of contributing drainage area,design flow rate,soil particle sizes to be removed,and other pollutants to be removed. The schematics are not for construction. They may serve as a starting point for creating a construction detail,but they must be site adapted by the designer. In addition,dimensions and notes appropriate for • The designer or vendor of the proprietary device shall provide a minimum of three references for the application must be added by the designer. projects where the device has been installed and maintained in operation at a construction site for at least six months. Local references are preferred;but references from other regions can be accepted if a similarity between the reference project and the proposed application can be demonstrated. • Proprietary devices must not completely block the inlet. The device shall have a minimum of a 2 inch wide opening for the length of the inlet when it will be used in areas that water can safely pond to depths deeper than the design depths for the inlet. If ponding is not an option,then the device must have overflow capacity equal to the inlet design flow rate. • Some proprietary devices are available with replaceable pads or filters. These pads or filters have the added benefit or removing pollutants such as metals and oils in addition to removing sediment. Inlet Protection CC-85 Inlet Protection CC-86 Revised 04/10 Revised 04/10 iSW MT"Technical Manual Construction Controls iSW MTN Technical Manual Construction Controls rIT- WIRE MESH INSTALLATION PROCESS NICE FILTER STONE AFTER WEIR ORGANIC FILTER TUBE CONSTRUCTION-\ WRAP 17X1ICWRE (DIA=Y LESS THAN INLET OPENING) r.ESN AROUND rxr WEIR BEFORE t6TPLUN0 MIOgR BOARDS ONTCP \�/,:��' rarWat 2'MINIMUM LENGTH Y X4 �j//� <_r CURB INLET , rxrauPPOar ANCHOR BOARD ROCK BATOR ,( 314'FILTER STONE ALTERNATE WEIGHT 4'X 4'WELDED WIRE FABRIC \�/\ \.. \jS WIRE MESH(12"X 1/C) A^. CATCH BASIN ' ' f ,,, Ami I�IF CURB INLET i��v' ORGANIC FILTER TUBE CURB INLET PROTECTION CROSS SECTION �O N.T.B. YX4 WEIR \- 7X4"SUPPORT ��1;� CATCH BASIN 12. 2'X 4'WEIR CURB INLET PROTECTION CROSS SECTION HT'S' 1'X4'WELDED WIRE FABRIC TOP OF INLET BOX ROCK BAG TO YX4'WEIR PREVENT FLOW UNDER 2 MINIMUM LENGTH od p3:44 THE WIRE MESH yyy�Y��yyyy n— YX4'ANCHOR Icl•,,,,,,,,y A BOARD q ,*0 WIRE MESH(12'X 112') t J4 r 2'OPENING 411);11::::4 BETWEEN 2.X4' f,:-.?!.,:g..),,, WEIR BOARD AND TOP OF INLET BOX CURB INLET 4 0 Jf7; I„...=,, 0.'';":""1"'''::p ROCK BAG OR .� o-aRU1 3/4”FILTER STONE 'y�111111 ALTERNATE WEIGHT 7ijT!.;$ ORGANIC FILTER TUBE(EXTEND ='ff-sd_it, 12°BEYOND END OF CURB >Y' OPENING ON BOTH SIDES) CURB WIRE MESH WRAPPED CURB ORGANIC FILTER TUBE CURB INLET PROTECTION PLAN VIEW OVER AND SECURED N.T.S. TO Y X 4'BOARD NOTE:THIS CONTROL WILL DECREASE THE CAPACITY OF THE INLET.IT SHALL ONLY BE USED WHEN AN 2'X 4'WEIR CURB INLET PROTECTION PLAN VIEW ENGINEER HAS DETERMINED THERE IS ADEQUATE STORAGE OR POSITIVE OVERFLOW. N T.B. NOTE:THIS CONTROL WILL DECREASE THE CAPACITY OF THE INLET.IT SHALL ONLY BE USED WHEN AN ENGINEER HAS DETERMINED THERE IS ADEQUATE STORAGE OR POSITIVE OVERFLOW. Figure 3.5 Schematics of 2"x4"Weir Curb Inlet Protection Figure 3.6 Schematics of Organic Filter Tube Curb Inlet Protection (Source:Modified from Washington Suburban Sanitary Commission Detail SC-10.0) (Source:Modified from City of Plano BMP SP-4) Inlet Protection CC-87 Inlet Protection CC-88 Revised 04/10 Revised 04/10 ISWMrN Technical Manual Construction Controls ISWMT"'Technical Manual Construction Controls t.« S. M I/ry1' / CONCRETE BLOCK SECURE FILTER FABRIC —12' TO HOGWIRE AT 2'BELOW ROCK BAG OR USE I'X 4'BOARD 3/4"FILTER STONE � RFLQk TOP OF INLET OPENING SECURED WITH CONCRETE NAILS O.C. (SEE DESIGN CRITERIA) ` / / k•�Q/r4 FILTER FABRIC .�" /�`'L�� CURB INLET /Not / CURB INLET �j , WIRE MEPLACEDXOVER ``I`I`I//,•••••••/,'`` � '� >/ VERTICAL FAC / V/�� ''/I/ y' \,\. \% 2'X 4'WOOD STUD �/O •.':/�//\ V. .A/'! CATCH BASIN . 2'X4'-WIRE MESH -(-GZ CATCH BASIN ,..x,:.-., BLOCK AND GRAVEL FILTER CURB INLET PROTECTION CROSS SECTION N.T.S. HOG WIRE WEIR CURB INLET PROTECTION CROSS SECTION -- # CONCRETE BLOCK 314'FILTER STONE -`-,7(' rl% I_ 1S N.T.B. y ' r'-- ROCK BAG OR USE I'X 4'BOARD �') �° -- SECURED WITH CONCRETE NAILS O.C. 12"MIN M k (SEE DESIGN CRITERIA) �' Y3 MO 2'X 4"WIRE MESH MID FILTER , ', FABRIC(LEAVE 2'OPENING TOP OF INLET BOX FROM TOP OF INLET OPENING WIRE MESH(1/2'X 12') _ t . TO TOP OF FILTER FABRIC) iltrAV PLACED OVER - TOP OF INLET BOX /• VERTICAL FAC _' ry-�'- 'r 7) 2"X4"WIRE MESH mil` .OW ROCK BAG E PREVENT � : il FLOW UNDER THE PREVENT WIRE a 4 2'X4"WOODSTUD i tj t, CURB ONLY THE WIRE MESH a EXTENDS TO TOP OF INLET ', U SECURE FILTER _ TO SECURE THE CONTROL 4` i.�. FABRIC TO WIRE WITH - SK's - L' CLIPS OR HOORINGS CURB HOG WIRE WEIR CURB INLET PROTECTION PLAN VIEW BLOCK AND GRAVEL FILTER CURB INLET PROTECTION PLAN VIEW N.T.9. N.T.S. NOTE:THIS CONTROL WILL DECREASE THE CAPACITY OF THE INLET.IT SHALL ONLY BE USED WHEN AN NOTES: 1.DO NOT INSTALL ON INLETS IN A PUBLIC STREET OR OTHER ACTIVE TRAVEL LANE.BLOCK AND ENGINEER HAS DETERMINED THERE IS ADEQUATE STORAGE OR POSITIVE OVERFLOW. GRAVEL FILTER IS INTENDED FOR USE ON LOW POINT(SUMP)INLETS IN PARKING LOTS AND OTHER PAVEMENT THAT IS NOT AN ACTIVE TRAVEL LANE.THIS INLET PROTECTION METHOD ALLOWS FOR FULL USE OF THE INLET DESIGN CAPACITY. 2.INSTALL TRAFFIC CONES AS NEEDED TO MINIMIZE THE POTENTIAL FOR CARS HITTING THE BLOCK AND GRAVEL Figure 3.7 Schematics of Hog Wire Weir Curb Inlet Protection (Source:Modified from City of Round Rock Detail E-03) Figure 3.8 Schematics of Block and Gravel Filter Curb Inlet Protection Inlet Protection CC-89 Inlet Protection CC-90 Revised 04/10 Revised 04/10 iSW Mr"Technical Manual Construction Controls iSW MT'Technical Manual Construction Controls ATTACH FILTER TOP BOARD FOR STABILITY FABRIC SECURELY TO 2-x4'WIRE FENCE 2 X 4'WOOD POST I ' 1S•MAX FABRIC ANCHORED S•x8•TRENCH BACKF INILLED WITH COMPACTED EARTH 38'MAX 12 MIN. h N ,LE � INLfl• ill N:., ..0.r.7. FILTERRFABRIC•Y•INLET PROTECTION CROSS SFCTION N.T.S. TOP OF INLET BOX ATTACH FILTER ^TOP BOARD FOR STABILITY FABRIC SECURELY TO 4' I(/( 2-x WIRE FENCE 7 X 4-W000 POST 10 MAX '�� FABRIC ANCHORED IN 8'x&•TRENCH BACKFILLED (-'.:_ WITH COMPACTED EARTH ORGANIC FILTER TUBE 36-MAX (9'MINIMUM DIA) //'� // y :<, , ,.. i a e k.,,i fj�j,.,� 1z MIN. !� da F1 �. DROP ' /CURB ��', �INLET�" N !!! ROCK BAG /r, -✓ I •:•- " 4 -Z• •t. :... •■ N.T.S. FILTER FABRIC TRAFFIC CONE \\ 2'X 4*WOOD POST ' 1 (\ ) FLOW GRAIN GRATE OVERFLOW 110/001/ H 3'MAXIMUM— 7X4•WIRE FENCE �VI6 .17.34' BACKING 6° FILTER FABRIC AREA INLET PROTECTION PLAN VIEW N.T.B. NOTES: 1.CONCENTRATED DITCH FLOW COMING FROM ONE OR MORE SIDES TOWARD THE INLET ORGANIC FILTER TUBE ON-GRADE CURB INLET PROTECTION DETAIL MAY REQUIRE A STONE OVERFLOW STRUCTURE TO BE CONSTRUCTED ON ONE SIDE OF NT.B. THE INLET(SEE SECTION 3.10 SILT FENCE). NOTES:1.THIS DETAIL IS INTENDED FOR USE WITH ON-GRADE INLETS(NOT A LOW POINT)WHERE 2.POSTS SHALL BE INSTALLED AT EACH CORNER AND BETWEEN CORNERS IF THE WATER WOULD BE DIVERTED INSTEAD OF PONDING BEHIND THE OTHER TYPES OF INLET DISTANCE IS GREATER THAN S BETWEEN CORNER POSTS. PROTECTION. 2.DO NOT INSTALL ON INLETS WHERE THE ORGANIC FILTER TUBE WOULD EXTEND INTO AN ACTIVE TRAVEL LANE. i Figure 3.9 Schematic of Organic Filter Tube On-Grade Curb Inlet Protection Figure 3.10 Schematics of Filter Fabric Area Inlet Protection Fi 9 9 (Source:City of Plano BMP SP-4) Inlet Protection CC-91 Inlet Protection CC-92 Revised 04/10 Revised 04/10 ISWM'"Technical Manual Construction Controls iSWMTN Technical Manual Construction Controls 1@'x112' •'MIN. S'MIN. CRETE BLOCKS WIRE SCREEN II (2 HIGH MAX.) EXCAVATED AREA=DESIGN j�'U�'■'Ui j 1 112'FILTER STONE STORM VOLUME OR 3,800 CF FLOW A , I I j,_. .FWV/el,Ai PER ACRE DISTURBED FILTER STONE(1/2'X1!2') LESS THAN`V .�< „=1 /1��,_�1�C 5%SLOPE FOR COVERING WEEP HOLES 'y' _18'� INLET MIN I 21 MAX SLOPE ' Y 1 MIN „, BLOCK AND GRAVELY'INLET PROTECTION CROSS SECTION y 1 I 2 MAX { N.T.S. n � >1 DROP ,f,�y'� > Xr�,.,,�G�„ INLET . �'? �� ,' 1/2-x1/2' CONCRETE BLOCKS 'vhf "v(, ? '� " WIRE SCREEN \/ ? � sZ < j MINIM V 12'FILTER STONE . FLOW .31„5,4_,..,,,,,_,,,..,,, , j■iai•j j: .'—FLOW 1 DIA WEEP HOLES,TO BE FILLED WITH LESS THAN ,�N/;'i jlJi,„ i`T GROUT PRIOR TO BACKFILUNG OF STORAGE 5%SLOPE DROP /. ,^13' AREA INLET . MIN EXCAVATED IMPOUNDMENT DROP INLET PROTECTION CROSS SECTION BLOCK AND GRAVEL DROP INLET PROTECTION CROSS SECTION N.T.S. N.T.S. 112'FILTER STONE 1 1/2”FILTER STONE 12'x 12' -4 FLOWS ._�: YT „l�4.{$ WIRE SCREEN -•.Y'�is J= :: 0RATE,„��_-„, �` ?,. D ' ! IP • GRATE al g_-all- >>` f_ ,.) [Rill MO! - CONCRETE i - I� lI � �, BLOCKS '''''''117‘”_tli dui 4_S4C., ,74i`Y ..---i FLOW EXCAVATED IMPOUNDMENT AREA INLET PROTECTION PLAN VIEW BLOCK AND GRAVEL AREA INLET PROTECTION PLAN VIEW N.T.S. N.T.S. Figure 3.12 Schematics of Block and Gravel Area Inlet Protection Figure 3.11 Schematics of Excavated Impoundment Area Inlet Protection (Source:Modified from City of Plano BMP SP-4) Inlet Protection CC-93 Inlet Protection CC-94 Revised 04/10 Revised 04/10 iSW MTM Technical Manual Construction Controls iSW Mry Technical Manual Construction Controls 3.6 Organic Filter Tubes Sediment Control SEE EMBEDMENT DETAIL 4'+ ORGANIC Y ,l- . / Description: Organic filter tubes are FILTER TUBE �.!�- comprised of an open weave,mesh tube �� r � .' j%�'T '� : .' - that Is filled with a filter material(compost, �T>7 ,t„ 1.> + i� S 4 + wood chips,straw,coir,aspen fiber,or a 1 � ."INLET ` \ �.. Yr 4 + ./Y4, 4> mixture of materials).The tube may be //' i,'a". Oly �, constructed of geosynthetic material, ORGANIC FILTER TUBE M INLET PROTECTION CROSS SECTION i', '� + 4, • plastic,or natural materials. Organic filter N.T.S. +4 ,_- tubes are also called fiber rolls,fiber logs, wattles,mulch socks,and/or coir rolls. SEE EMBEDMENT DETAIL °"WOOD • tubes linear flow and capture..� sediment of I slop controls along the ��y t \STAKES ,- ,y_+ contours of a slope or as a penmeter f\��,`` ��NR .� ��\';V;' `'^' u' ,�4: + control down-slope of a disturbed area. ORGANIC FILTER TUBE DROP INLET PROTECTION CROSS SECTION n � A N.TS. DESIGN CRITERIA: Perimeter Control '<Z,.0(,,,,,\ • 9 inch minimum tube diameter when filled • 3 inch minimum embedment in soil Slope Protection ORGANIC FILTER TUBE )) DRAIN GRATE • 18 Inch minimum overlap at ends of tubes Sediment Barrier (12'MINIMUM DIAMETER)-...„N„,l ''1'—'2...---‘'It. • Spacing based on drainage area and slope Channel Protection 1 alto I�I1 I1/ 2'XT WOOD STAKES • Must be staked on soil and secured with rockbags on y i' Temporary Stabilization ��Q��Q�1 i i I 4'SPACING pavement ends '1'11 • Turn ends of tube lines upslope a minimum of 10 feet Final Stabilization -----.I Waste Management 12.MIN.OVERLAP ADVANTAGES I BENEFITS: 134 Housekeeping Practices • Effective means to treat sheet flow over a short distance �pSV • Relatively easy to install �� Fe=0.50-0.75 • May be used on steep slopes ORGANIC FILTER TUBE AREA INLET PROTECTION PLAN VIEW (Depends on soil type) • Can provide perimeter control on paved surfaces or where N.TS. soil type prevents embedment of other controls IMPLEMEN1A7ION ORGANIC FILTER TUBE T x WOOD STAKES MAXI'SPACING DISADVANTAGES I LIMITATIONS: CONSIDERMIONS (1T MINIMUM DIA) (EXTEND 2'MAX ABOVE TOP OF TUBE) • Difficult to remove when wet and/or filled with sediment SLOPE • Relatively small effective areas for sediment capture G Capital Costs VARIES /(. ��((� IT MINIMUM P Maintenance {` )1 T� -._: S EMBEDMENT MINIMUM MAINTENANCE REQUIREMENTS 0 Training I L: • Inspect regularly n9 k.:-..71 y I III III y• ' 12 MINIMUM • Repair eroded areas underneath the organic filter tubes Q Suitability for Slopes•5% — { I I - • Re-align and stake tubes that are dislodged by flow -i.j__I)y • Remove sediment before it reaches half the height of the Other Considerations: exposed tube None •EMBEDMENT EXAMPLE FOR ORGANIC FILTER TUBE N.T.a. TARGk7FD POLLUTANTS • Sediment O Nutrients&Toxic Materials G Oil&Grease Figure 3.13 Schematics of Organic Filter Tube Area Inlet Protection 0 Floatable Materials O Other Construction Wastes Inlet Protection CC-95 Organic Filter Tubes CC-100 Revised 04/10 Revised 04/10 iSW Mr"Technical Manual Construction Controls iSW Mr'Technical Manual Construction Controls 3.6.1 Primary Use • When using manufactured tubes, the manufacturer's recommendations for diameter and spacing Organic filter tubes are long,flexible controls that are used along a line of constant elevation(along a based on slope, flow velocities, and other site conditions shall be followed when they are more stringent than the design criteria in this section. contour)on slopes. They are used as perimeter controls down slope of disturbed areas and on side slopes where stormwater may runoff the area. The tubes maintain sheet flow, slow velocities, and • When used as a perimeter control on grades of 10:1 or less,criteria in the following table shall be capture sediment. When used on slopes,they also shorten the slope length and protect the slope from used as a guide for the size and installation rate of the organic filter tube. erosion. Table 3.1 Perimeter Control Applications* 3.6.2 Applications Dabble Area(Max) Max Row length to the Tube Tube Dlaneter(Mi,) Organic filter tubes include a wide variety of tube and filter materials. Organic filter tubes are used as a perimeter sediment barrier,similar to silt fence,for development projects and linear projects,such as 1/3 Acre per 100 feet 145 feet 18 inches roadways and utilities. They work well on individual residential lots and on lots being re-developed, 1/4 Acre per 100 feet 110 feet 15 inches where space may be limited. Organic filter tubes are most effective with coarse to silty soil types. 1/5 Acre per 100 feet 85 feet 12 inches Additional controls may be needed to remove fine silts and clay soils suspended in stormwater. Organic filter tubes can be used on paved surfaces where it's not possible to stake a silt fence. 1/8 Acre per 100 feet 55 feet 9 inches Applications on paved surfaces include perimeter controls for soil stockpiles, pavement repair areas, (Source:Modified and expanded from City of Plano Fact Sheet SP-13) utility trenching,and building demolition. When compost filter material is used in tubes on pavement,the 'Applicable on grades of 10.1 or flatter. material has the added benefit removing some oil and grease from stormwater runoff. • When installing organic filter tubes along contours on slopes,criteria in the following table shall be Applications on slopes include temporary sediment control during construction and erosion control of the used as a general guide for size and spacing of the tubes. Actual tube diameter and spacing shall be disturbed soil on the slope. Organic filter tubes may be used to control sheet flow on slopes when final specified by the designer. The designer shall consider the tube manufacturers recommendations, stabilization measures are being applied and established. the soil type,flow volume on the slope,required performance life,and erosion control measures that may be used in conjunction with the tubes. Organic filter tubes may also be used for inlet protection and,in limited cases,as check dams in small drainage swales. Refer to Section 3.4 Inlet Protection and Section 2.1 Check Darn for the design criteria Table 3.2 Maximum Spacing for Slope Protection to use organic filter tubes in these applications. ;.Tube j (Mm) Slope(HtV) 9Indies 12 Indies 18 Indies 24 Indies 3.6.3 Design Criteria 5:1 to 10:1 35 feet 40 feet 55 feet 60 feet 4:1 30 feet 40 feet 50 feet 50 feet General Criteria 3:1 25 feet 35 feet 40 feet 40 feet • Filter tubes should be installed along the contour. 2:1 20 feet 25 feet 30 feet 30 feet 1:1 10 feet 15 feet 20 feet 20 feet • Tubes shall be staked with 2 inch by 2 inch wooden stakes at a maximum spacing of 4 feet. Rebar or (Source:Modified and expanded from Iowa Statewide Urban Design and Specifications Standards for Filter Socks) similar metal stakes may be used instead of wooden stakes. Tube Material • When placed on pavement,sand or rock bags shall be placed abutting the down-slope side of the The designer shall specify the type of mesh based on the required life of the tube. At a minimum,the •tubes to prevent runoff from dislodging the tubes. At a minimum,bags shall be placed one foot from each end of the tube and at the middle of the tube. mesh shall have a rated life of one year under field conditions. • Filter tubes shall be embedded a minimum of three inches when placed on soil. Placement on rock • If the tubes will be left onsite as part of the final stabilization,they must be constructed of 100 percent shall be designed as placement on pavement. biodegradable jute, coir,sisal or similar natural fiber or 100 percent UV photodegradable plastic, polyester or geosynthetic material. • The end of tubes shall overlap a minimum of 18 inches when multiple tubes are connected to form a •linear control along a contour or a perimeter. Mesh tubes may be oval or round in cross-section. • • The last 10 feet(or more)at the ends of a line of tubes shall be turned upslope to prevent bypass by Mesh for the tubes shall be open and evenly woven. Size of weave openings shall be specified stormwater. Additional upslope lengths of tubes may be needed every 200 to 400 linear feet, based on filter material. Openings may range from V inch for Erosion Control Compost to 2 inches depending on the traverse slope along the line of tubes. for straw and coir. • The most common sizes of tubes are 9 and 12 inch diameter;however,tubes are available in sizes • Mesh should not exceed''/:inch in diameter. up to 24 inch diameter. The designer shall specify a diameter based on the site application. Tubes Filter Material less than 9 inches in diameter when filled shall not be used. • Manufactured organic filter tube products shall have documentation of a minimum 75 percent soil • Different filter materials have different properties and will affect sheet flow differently. The designer shall specify the type of material to be used(or excluded)on a particular site. retention using ASTM D7351 Standard Test Method for Determination of Sediment Retention Device Effectiveness in Sheet Flow Applications. • Straw filter material shall be Certified Weed Free Forage. The straw must be in good condition,air- dried,and not rotten or moldy. Organic Filter Tubes CC-101 Organic Filter Tubes CC-102 Revised 04/10 Revised 04/10 iSW MTN Technical Manual Construction Controls iSW Mr"'Technical Manual Construction Controls • Compost shall conform to the requirements for Erosion Control Compost in TxDOT Special Specification 1001 Compost(2004). Compost may provide some oil and grease removal;however, the large percentage of fines in compost will result in less filtering and more ponding of stormwater. • Wood chips shall be 100 percent untreated chips and free of inorganic debris,such as plastic,glass, metal,etc. Wood chip size shall not be smaller than 1 inch and shall not exceed 3 inches in diameter. 18"MIN Shavings shall not be more than 5%of the total mass. OVERLAP 3.6.4 Design Guidance and Specifications ORGANIC FILTER TIRE S ecifications for Erosion Control Com ost to be used as filter material ma be found in Item 161 of the (0'MINIMUM DIA) x2'WP CI STAKES P P Y - MAX 4'VOOD SPACING Standard Specifications for Construction and Maintenance of Highways,Streets,and Bridges(TxDOT A--1 \ - - - TIGHT WITH NO GAPS 2004)and TxDOT Special Specification 1001 Compost(2004). 3.6.5 Inspection and Maintenance Requirements A Organic filter tubes should be inspected regularly (at least as often as required by the TPDES ORGANIC FILTER TUBE PERIMETER CONTROL PLAN VIEW Construction General Permit). The filter tube should be checked to ensure that it is in continuous contact N.T.s. with the soil at the bottom of the embedment trench. Closely check for rill erosion that may develop under the filter tubes. Eroded spots must be repaired and monitored to prevent reoccurrence. If erosion under the tube continues,additional controls are needed. SEE Staking shall be checked to ensure that the filter tubes are not moving due to stormwater runoff. Repair EMBEDMENT and re-stake slumping filter tubes. Tubes that are split,torn or unraveling shall be repaired or replaced. EXAMPLE ORGANIC FILTER TUBE (r MINIMUM DIA.) SLOPE Check the filter tube material to make sure that it has not become clogged with sediment or debris. Clogged filter tubes usually lead to standing water behind the filter tube after the rain event. Sediment OVERLAP ORGANIC shall be removed from behind the filter tube before it reaches half the height of the exposed portion of the _11 / FILTER TUBE 13•MINIMUM tube. When sediment control is no longer needed on the site the tubes may be split open and the filter material may be used for mulching during establishment of vegetation for final stabilization if it meets the criteria in Section 2.5 Mulching. SPACING DEPENDS ON SLOPE 3.6.6 Example Schematics STEEPNESS The following schematics are example applications of the construction control. They are intended to FOR SLOPES OF 2:1 OR STEEPER A SECOND STAKE assist in understanding the control's design and function. AGAINST THE DOWNSLOPE FACE OF THE TUBE MAY BE NEEDED DEFENDING ON SOIL'TYPE The schematics are not for construction. They may serve as a starting point for creating a construction detail,but they must be site adapted by the designer. In addition,dimensions and notes appropriate for the application must be added by the designer. ORGANIC FILTER TUBE SLOPE PROTECTION PROFILE N.TS. NOTES: 1.TYPE OF NETTING,FILTER MATERIAL DIAMETER OF TUBE,AND SPACING OF TUBES SHALL BE SPECIFIED BY THE DESIGNER BASED ON THE FOLLOWING SITE PARAMETERS. •SIZE OF CONTRIBUTING DRAINAGE AREA •STEEPNESS OF SLOPE •GROUND CONDITIONS(SOIL OR PAVEMENT) 2.DESIGNER SHALL SHOW ON THE DRAWINGS THE LOCATIONS WHERE TUBES ARE TO BE TURNED UPSLOPE.UPSLOPE LENGTHS SHALL BE MINIMUM OF 10 FEET. Figure 3.15 Schematics of Organic Filter Tubes Organic Filter Tubes CC-103 Organic Filter Tubes CC-104 Revised 04/10 Revised 04/10 iSW M'N Technical Manual Construction Controls iSW M't"Technical Manual Construction Controls 3.10 Silt Fence Sediment Control Description: A silt fence consists of '/��— "^^..,, ,/�Dratnagearea geotextile fabric supported by wire mesh hmb netting or other backing stretched between INsturbed Area 4'' �•• _ metal posts with the lower edge of the dd '"i fabric securely embedded six-inches in the G Stn Fefxe/� soil. The fence is typically located ,'2 downstream of disturbed areas to intercept Stabilized Area s - runoff in the form of sheet flow. A silt -` 3f $, �9�� fence provides both filtration and time for ORGANIC FILTER TUBE(S'MINIMUM DIA) SuPPab `- r�` sediment settling by reducing the velocity NO EMBEDMENT NEEDED WHEN INSTALLED 2'x2'WOOD STAKES MAX 4'SPACING of the runoff. BEHIND A SIDEWALK OR CURB- (EXTEND 2'MAX ABOVE TOP OF TUBE) SIDEWALK OR CURB T� T ATI AP?UCATTONS DESIGN CRITERIA: Perimeter Control FLOW 4`l� ); • • Maximum drainage area of 025 acre per 100 linear feet of silt Slope Protection fence '--11-111"-111 I d [ I' ' -• Sediment Harrier �--; - • Maximum 200 feet distance of flow to silt fence;50 feet tf 111 11-IT 111 slope.exceeds 10 percent Channel Protection 1.. -1 ll-'✓ • Minimum fabric overlap of 3 feet at abutting ends;join fabric to Temporary Stabilization prevent leakage INSTALLATION EXAMPLE FOR ORGANIC FILTER TUBEABUTTING PAVEMENT • Turn end of silt fence line upslope a minimum of 10 feet Final Stabilization N.T.B. • Install stone overflow structure at low points or spaced at Waste Management approximately 300 feet if no apparent low point Housekeeping Practices ADVANTAGES!BENEFITS: • Economical means to treat sheet flow Fe=0•50-0.75 • Most effective with coarse to silty soil types (Depends on sat type) 2'x 2'WOOD STAKES MAX 4'SPACING DISADVANTAGES!LIMITATIONS: ORGANIC FILTER TUBE (EXTEND 2'MAX ABOVE TOP OF TUBE) PMPLEMENTA1TON (9'MINIMUM DIA) • Limited effectiveness with clay soils due to clogging CONSIDERATIONS • Localized flooding due to minor ponding at the upslope side of SLOPE the silt fence C Capital Costs VARIES ��((j �, 9'-20'PER DESIGN • Not for use as check dams in swales or low areas subject to H .\� l}1/j CALCULATIONS concentrated flow • Maintenance 71,11---1 - I`r- - EMBEDMENT MINIMUM • Not for use where soil.Conditions prevent a minimum toe-in 1 O Training Il T 'ICI— -�...- 12'MINIMUM depth of 6 inches or installation of support posts to a depth of .0 12 inches C Suitability for Slopes>5% `,11;_1-1.-.7-. • Can fail structurally under heavy storm flows, creating maintenance problems and reducing effectiveness ; Other Considerations: EMBEDMENT EXAMPLE FOR ORGANIC FILTER TUBE MAINTENANCE REQUIREMENTS: • Effects of ponding or the N.T.B. reduecflon of flow onto • Inspect regularly adjacent areas and property, • Repair undercutting,sags and other fence failures • Remove sediment before it reaches half the height of the fence • Repair or replace damaged or clogged filter fabric TARGETED POU.UTAN75 • Sediment O Nutrients&Toxic Materials O Oil&Grease G Floatable Materials Figure 3.16 Examples of Organic Filter Tube Installation Methods O Other Construction Wastes Organic Filter Tubes CC-105 Silt Fence CC-143 Revised 04/10 Revised 04/10 iSW Mmm Technical Manual Construction Controls iSW MT"Technical Manual Construction Controls 3.10.1 Primary Use o Apparent Opening Size,ASTM D4751 Test Method for Determining Apparent Opening Size of a Silt fence is normally used as a perimeter control on the down slope side of disturbed areas and on side Geotextile,U.S.Sieve No.30(max)to No.100(min). slopes where stormwater may runoff the area. It is only feasible for non-concentrated, sheet flow o Ultraviolet Resistance,ASTM D4355 Standard Test Method for Deterioration of Geotextiles by conditions. If it becomes necessary to place a silt fence where concentrated flows may be occur(e.g. Exposure to Light,Moisture,and Heat in a Xenon Arc Type Apparatus,Minimum 70 percent. where two silt fences join at an angle, or across minor channels or gullies), it will be necessary to Fence posts shall be steel and may be T-section or L-section,1.3 pounds per linear foot minimum, •reinforce the silt fence at that area by a rock berm or sand bag berm,or other structural measures that will and 4 feet in length minimum. Wood posts may be used depending on anticipated length of service support the silt fence. and provided they are 4 feet in length minimum and have a nominal cross section of 2 inches by 4 inches for pine or 2 inches by 2 inches for hardwoods. 3.10.2 Applications • Silt fence shall be supported by steel wire fence fabric as follows: Silt fence is an economical means to treat overland,non-concentrated flows for all types of projects. Silt o 4 inch x 4 inch mesh size,W 1.4/1.4,minimum 14 gauge wire fence fabric; fences are used as perimeter control devices for both site developers and linear(roadway)type projects. They are most effective with coarse to silty soil types. Due to the potential of clogging and limited o Hog wire,12 gauge wire,small openings installed at bottom of silt fence; effectiveness,silt fences should be used with caution in areas that have predominantly clay soil types. In o Standard 2 inch x 2 inch chain link fence fabric;or this latter instance,a soils engineer or soil scientist should confirm the suitability of silt fence for that application. Additional controls may be needed to remove fine silts and clay soils suspended in o Other welded or woven steel fabrics consisting of equal or smaller spacing as that listed herein stormwater. and appropriate gauge wire to provide support. • Silt Fence shall consist of synthetic fabric supported by wire mesh and steel posts set a minimum of 3.10.3 Design Criteria 1-foot depth and spaced not more than 6-feet on center. • Fences are to be constructed along a line of constant elevation(along a contour line)where possible. • A 6 inch wide trench is to be cut 6 inches deep at the toe of the fence to allow the fabric to be laid below the surface and backfilled with compacted earth or gravel to prevent bypass of runoff under the • Silt fence can interfere with construction operations;therefore,planning of access routes onto the site fence. Fabric shall overlap at abutting ends a minimum of 3 feet and shall be joined such that no is critical. leakage or bypass occurs. If soil conditions prevent a minimum toe-in depth of 6 inches or installation • Maximum drainage area shall be 0.25 acre per 100 linear feet of silt fence. of support post to depth of 12 inches,silt fences shall not be used. • Maximum flow to any 20 foot section of silt fence shall be 1 CFS. • Sufficient room for the operation of sediment removal equipment shall be provided between the silt fence and other obstructions in order to properly maintain the fence. • Maximum distance of flow to silt fence shall be 200 feet or less. If the slope exceeds 10 percent the flow distance shall be less than 50 feel. • The last 10 feet(or more)at the ends of a line of silt fence shall be turned upslope to prevent bypass of stormwater. Additional upslope runs of silt fence may be needed every 200 to 400 linear feet, • Maximum slope adjacent to the fence shall be 2:1. depending on the traverse slope along the line of silt fence. • Silt fences shall not be used where there is a concentration of water in a channel,drainage ditch or swale,nor should it be used as a control on a pipe outfall. 3.10.4 Design Guidance and Specifications • If 50 percent or less soil,by weight,passes the U.S.Standard Sieve No.200;select the apparent Specifications for construction of this item may be found in the Standard Specifications for Public Works opening size(A.O.S.)to retain 85percent of the soil. Construction — North Central Texas Council of Governments, Section 201.5 Silt Fence and in the • If 85 percent or more of soil by weight,passes the U.S.Standard Sieve No.200,silt fences shall not Standard Specifications for Construction and Maintenance of Highways, Streets and Bridges (TxDot be used unless the soil mass is evaluated and deemed suitable by a soil scientist or geotechnical 2004)Item 506.2.J and Item 506.4.C.9. engineer concerning the erodiblity of the soil mass,dispersive characteristics,and the potential grain- The American Society for Testing and Materials has established standard specifications for silt fence size characteristics of the material that is likely to be eroded. materials(ASTM D6461)and silt fence installation(ASTM D6462). • Stone overflow structures or other outlet control devices shall be installed at all low points along the fence or spaced at approximately 300 feet if there is no apparent low point. 3.10.5 Inspection and Maintenance Requirements • Filter stone for overflow structure shall be 1 %inches washed stone containing no fines. Angular Silt fence should be inspected regularly(at least as often as required by the TPDES Construction General shaped stone is preferable to rounded shapes. Permit)for buildup of excess sediment, undercutting, sags, and other failures. Sediment should be • Silt fence fabric must meet the following minimum criteria: removed before it reaches half the height of the fence. In addition,determine the source of excess sediment and implement appropriate measures to control the erosion. Damaged or clogged fabric must o Tensile Strength, ASTM D4632 Test Method for Grab Breaking Load and Elongation of be repaired or replaced as necessary. Geotextiles,90-lbs. o Puncture Rating, ASTM D4833 Test Method for Index Puncture Resistance of Geotextiles, Geomembranes,and Related Products,60-lbs. o Mullen Burst Rating, ASTM D3786 Standard Test Method for Hydraulic Bursting Strength of Textile Fabrics-Diaphragm Bursting Strength Tester Method,280-psi. Silt Fence CC-144 Silt Fence CC-145 Revised 04/10 Revised 04/10 ISW M-"Technical Manual Construction Controls 1SW MT"'Technical Manual Construction Controls 3.10.6 Example Schematics The following schematics are example applications of the construction control. They are intended to MAX 6 SPACING FOR FENCE POST assist in understanding the control's design and function. SILT FENCE(MIN HEIGHT • The schematics are not for construction. They may serve as a starting point for creating a construction 24.ABOVE EXIST.GROUND) 4'MIN LENGTH detail,but they must be site adapted by the designer. In addition,dimensions and notes appropriate for c / FENCE POST the application must be added by the designer. COMPACTED EARTH ti•<` / OR ROCK BACKFILL {� WIRE MESH BACKING i.'8.?.-7-41.7:471r, MIN EMBEDMENT=1' 1111111 s f qqa! e'MIN TRENCH . FABRIC TOE-IN 8'MIN SILT FENCE EXAMPLE N.T.S. 8"MIN STONE OVERLAP OF FENCE ON EACH SIDE 8'MAX ILl 112 H SILT FENCE • yy` � � 1-12'FILTER 4F STONE { 8'MIN TOP OF FLO - STONE,EACH SIDE /�j iSW Mr""Technical Manual Construction Controls iSW M'M Technical Manual Construction Controls 3.11 Stabilized Construction Exit Sediment Control 3.11.1 Primary Use / Description: A stabilized Stabilized construction exits are used to remove soil,mud and other matter from vehicles that drive off of / construction exit is a pad of crushed a construction site onto public streets. Stabilized exits reduce the need to remove sediment from streets. �cY'/ Stabilized stone,recycled concrete or other rock When used properly,they also control traffic by directing vehicles a single(or two for larger sites)location. J Construction Exit Controlling traffic onto and off of the site reduces the number and uantil of disturbed areas and -Pb / material placed on geotextile filter g q Y - / _ t _<':-''/ cloth to dislodge soil and other debris provides protection for other sediment controls by decreasing the potential for vehicles to drive over the Q�/ //" from construction equipment and control. / vehicle tires prior to exiting the / Length construction site. The object is to 3.11.2 Applications 9 / minimize the tracking of soil onto public roadways where it will be Stabilized construction exits are used on all construction sites with a disturbed area of one acre or larger suspended by stormwater runoff. and are a recommended practice for smaller construction sites. A stabilized exit is used on individual residential lots until the driveway is placed. Stabilized construction exits may be used in conjunction KEYcousiDFRATIoN5 APpfUfQNS with wheel cleaning systems as described in Section 3.16 Wheel Cleaning Systems. DESIGN CRITERIA: Perimeter Control • Slope exit away from offsite paved surface Slope Protection 3.11.3 Design Criteria • Minimum width and length dependent on size of disturbed Sediment Barrier • Limit site access to one route during construction,if possible;two routes for linear and larger projects. area,which correlates to traffic volume • finches minimum thickness of stone layer Channel Protection • Prevent traffic from avoiding or shortcutting the full length of the construction exit by installing • Stone of 3 to 5 inches in size Temporary Stabilization barriers. Barriers may consist of silt fence,construction safety fencing,or similar barriers. • Add a wheel cleaning system when inspections reveal the Final Stablllzaiion: • Design the access point(s) to be at the upslope side of the construction site. Do not place stabilized exit does not prevent tracking Waste Management construction access at the lowest point on the construction site. ADVANTAGES/BENEFITS: Housekeeping Practices • Stabilized construction exits are to be constructed such that drainage across the exit is directed to a • Reduces tracking of soil onto public streets controlled,stabilized outlet onsite with provisions for storage,proper filtration,and removal of wash • Directs traffic to a controlled access point Fe=N/A water. • Protects other sediment controls by limiting the area • The exit must be sloped away from the paved surface so that stormwater from the site does not disturbed discharge through the exit onto roadways. DISADVANTAGES/LIMITATIONS: IMPLEMENTATION • Minimum width of exit shall be 15 feet. • Effectiveness dependent on limiting ingress and egress to GOHSIDERA710NS • The construction exit material shall be a minimum thickness of 6 inches. The stone or recycled the stabilized exit concrete used shall be 3 to 5 inches in size with little or no fines. • A wheel washing system may also be required to remove G Capital Costs" clay soil from tires,particularly in wet conditions p :Maintenance • The geotextile fabric must meet the following minimum criteria: MAINTENANCE REQUIREMENTS: 0 Training o Tensile Strength, ASTM D4632 Test Method for Grab Breaking Load and Elongation of Geotextiles,300 lbs. • Inspect lae rock O Suitability for Slopes>5%` Puncture Strength,ASTM D4833 Test Method for Index Puncture Resistance of Geotextiles, • Replace rock when sediment in the void area between the ° rocks is visible on the surface Other:Conslderations: Geomembranes,and Related Products,120 lbs. • Periodically re-grade and top dress with additional stone to : .:None ° Mullen Burst Rating, ASTM D3786 Standard Test Method for Hydraulic Bursting Strength of maintain efficiency Textile Fabrics-Diaphragm Bursting Strength Tester Method,600 psi. Apparent Opening Size,ASTM D4751 Test Method for Determining Apparent Opening Size of a TARGETED POLLUTANTS Geotextile,U.S.Sieve No.40(max). C Sediment • Rock by itself may not be sufficient to remove clay soils from wheels,particularly in wet conditions. When necessary, vehicles must be cleaned to remove sediment prior to entering paved roads, O Nutrients&Toxic Materials streets,or parking lots. Refer to Section 3.16 Wheel Cleaning Systems for additional controls. O Oil&Grease • Using water to wash sediment from streets is prohibited O Floatable Materials • Minimum dimensions for the stabilized exit shall be as follows: O Other Construction Wastes Stabilized Construction Exit CC-148 Stabilized Construction Exit CC-149 Revised 04/10 Revised 04/10 iSW MT"Technical Manual Construction Controls iSW M''Technical Manual Construction Controls Table 3.9 Minimum Exit Dimensions Min.Width Mk Length Mooed Area , d6dt of Exit <1 Acre 15 feet 20 feet LENGTH PER DESIGN >1 Acre but<5 25 feet 50 feet CALCULATIONS Acres RADIUS=5 \GRADE TO DRAIN AWAY FROM .? 5 Acres 30 feet 50 feet • STABIUZATION AND PAVED SURFACES • If a wheel cleaning system is used the width of the stabilized exit may be reduced to funnel traffic into ,7X. 9- �,, +, the system. Refer to Section 3.16 Wheel Cleaning. `�f .� ' `y= = 3.11.4 Design Guidance and Specifications �CU ONSIGN / EXIT MUST BE SLOPED SO THAT STORM WATER IS NOT ALLOWED TO LEAVE THE SITE Specifications for construction of this item may be found in the Standard Specifications for Public Works AND ENTER ROAD Construction-North Central Texas Council of Governments,Section 201.10 Stabilized Construction Entrance and in the Standard Specifications for Construction and Maintenance of Highways,Streets and TRANSITION TO Bridges(TxDOT 2004)Item 506.2.E and Item 506.4.C.5. PAVeosuRFADE 3.11.5 Inspection and Maintenance Requirements PLAN VIEW Construction exits should be inspected regularly(at least as often as required by the TPDES Construction N.T.S. General Permit). The stabilized construction exit shall be maintained in a condition that prevents tracking or flow of sediment onto paved surfaces. Periodic re-grading and top dressing with additional stone must be done to keep the efficiency of the exit from diminishing. The rock shall be re-graded when ruts appear. Additional rock shall be added when soil is showing through the rock surface. Additional controls are needed if inspections reveal a properly installed and maintained exit,but tracking of soil outside the construction area is still evident. Additional controls may be daily sweeping of all soil LENGTH PER DESIGN spilled,dropped,or tracked onto public rights-of-way or the installation of a wheel cleaning system. CALCULATIONS GRADE TO PREVENT RUNOFF FROM LEAVING SITE 3.11.6 Example Schematics I ( The following schematics are example applications of the construction control. They are intended to „ assist in understanding the control's design and function. �. / _�'s._ �"I � 5;? `} 'd �1.0 The schematics are not for construction. They may serve as a starting point for creating a construction - 1 /1 -� f-ti _ _ detail,but they must be site adapted by the designer. In addition,dimensions and notes appropriate for FILTER FABRIC EXISTING GRADE PAVED SURFAC the application must be added by the designer. 3.5'STONE OR RECYCLED CONCRETE CROSS SECTION N.T.S. NOTE INSTALL SILT FENCE,CONSTRUCTION SAFETY FENCING,OR SIMILAR BARRIER ALONG THE EXIT TO DIRECT TRAFFIC INTO THE EXIT. Figure 3.29 Schematics of Stabilized Construction Exit Stabilized Construction Exit CC-150 Stabilized Construction Exit CC-151 Revised 04/10 Revised 04/10 ISW Mr"Technical Manual Construction Controls iSW Mr"Technical Manual Construction Controls 4.1.1 Primary Use 4.0 Material and Waste Controls These management practices, along with applicable OSHA, EPA, and TCEQ requirements, are implemented at construction sites to prevent chemicals, hazardous materials, and their wastes from 4.1 Chemical Management becoming stormwater pollutants. Material and Waste Control Description: Chemical management addresses the potential for stormwater to be polluted with 4.1.2 Applications chemical matenals and wastes that are used or stored on a construction site. The objective of Chemical management is applicable on all construction sites where chemicals and hazardous materials chemical management is to minimize the potential of stormwater contamination by construction are stored or used and could result in pollutants being discharged with stormwater. Many chemicals, chemicals through appropriate recognition,handling,storage,and disposal practices such as paints,grease,concrete curing compounds,and pesticide are present at most construction sites. Chemical management is most effective when used in conjunction with controls in Section 4.8 Spill and KEY CONSIDERATIONS APPLICATIONS Leak Response Procedures. DESIGN CRITERIA: Perimeter Control Management of vehicle and equipment maintenance chemicals is applicable to all construction activities. • Designate a person responsible for chemical These chemicals are the most common ones on construction sites;plus,there are specific stormwater management Slope Protection permit requirements for vehicle and equipment maintenance. For these reasons,the management of • Minimize the amount of chemicals and waste stored chemicals associated with vehicles and equipment are found in Section 4.10 Vehicle and Equipment Sediment Barrier Maintenance. onsite • Provide secondary containment that 110 percent of Channel Protection Chemical management techniques are based on proper reco nition,handling,and disposal practices b ry P 9 q P P 9 9. P P by the largest container in the containment Temporary Stabilization construction workers and supervisors. Key elements are education and modification of workers'behavior • Label all containers " «. and provisions for safe storage and disposal. Cooperation and vigilance is required on the part of • Prohibit the discharge of washout water Final Stabilization supervisors and workers to ensure that the procedures are followed. • Train workers in proper procedures Waste Management The following list(not all inclusive)gives examples of targeted chemicals: • Provide timely removal of waste materials Housekeeping Practices • Paints LIMITATIONS: Solvents •• Not intended to address site-assessment and pre- IMPIEMFMATION Stains •existing contamination f�NSIDF1tATIONS • Does not address demolition activities and potential •• Wood preservatives pre-existing materials,such as lead and asbestos o Capital Costs • Does not address contaminated soils • Cutting oils Does not address spill and leak response procedures c Maintenance •• • Training Greases • Does not address chemicals associated with vehicle and equipment management O Suitability for Slopes a 5% Roofing tar MAINTENANCE REQUIREMENTS: • Pesticides,herbicides,&fertilizers Other Considerations: Concrete curing compound • Inspect regularly • TCEQ regulations for g com P • Check for proper storage and evidence of leaks and spills hazardous waste It is not the intent of chemical management to supersede or replace normal site assessment and • Make sure all containers are labeled remediation procedures. Significant spills and/or contamination warrant immediate response by trained • Check waste containers and dispose of the waste when professionals. Chemical management shall be applied in combination with criteria in Section 4.8 Spill and 90 percent full Leak Response Procedures. • Verify procedures are being followed • Train new employees and regularly re-train all employees 4.1.3 Design Criteria TARGETED POLLUTANTS • Construction plan notes shall require controls for all chemicals,hazardous materials,and their wastes that are potentially exposed to precipitation or stormwater runoff. O Sediment • Show the location of chemical and hazardous waste storage and secondary containment on the • Nutrients&Toxic Materials drawings,or require the contractor to add this information. • Oil&Grease • The contractor should be required to designate a site superintendent,foreman,safety officer,or other O Floatable Materials senior person who is onsite daily to be responsible for implementing chemical management. • Other Construction Wastes • Specify use of the least hazardous chemical to perform a task when alternatives are available. To the extent possible,do not use chemicals that are classified as hazardous materials or that will generate Chemical Management CC-178 Chemical Management CC-179 Revised 04/10 Revised 04/10 iSWMr"Technical Manual Construction Controls iSWMr"Technical Manual Construction Controls a hazardous waste. A hazardous material is any compound, mixture, solution, or substance • Do not mix different chemical wastes. First,dangerous reactions may result. Second, all of the containing a chemical listed on the EPA's Consolidated List of Chemicals Subject to the Emergency waste will be classified as the most hazardous waste in the container and will increase disposal costs. Planning and Community Right-to-Know Act(EPCRA)and Section 112(r)of the Clean Air Act(EPA 550-B-01-003,October 2001),available at • Clearly label all chemical and hazardous waste containers to identify which wastes are to be placed in each container. http://www.ena.doviceppo/pubs/title3.pdf • Based on information in the Material Safety Data Sheet,ensure that proper spill containment material Chemical and Hazardous Material Storage is available onsite and maintained near the storage area. • As much as possible, minimize the exposure of building materials, building products, landscape • Do not allow potentially hazardous waste to be stored on the site for more than 90 days. materials, fertilizers, pesticides, herbicides, detergents, and other materials to precipitation and Enforce hazardous waste handling and disposal procedures. •stormwater runoff. • Chemicals and hazardous materials shall be stored in their original,manufacturers'containers,inside Disposal Procedures a shelter that prevents contact with rainfall and runoff. • Regularly schedule waste removal to minimize onsite storage. • The amount of chemicals and hazardous materials stored onsite shall be minimized and limited to the • Use only licensed waste haulers. materials necessary for the current phase of construction. • For special and hazardous wastes, use licensed hazardous waste transporter that can classify, • Material Safety and Data Sheets(MSDSs)shall be available for all chemicals used or stored onsite. manifest and transport the special or hazardous wastes for disposal. • Chemical and hazardous materials shall be stored a minimum of 50 feet away from inlets,swales, • Where possible,send wastes such as used oil to a recycler instead of a disposal facility. drainage ways,channels,and other waters,if the site configuration provides sufficient space to do so. In no case shall material and waste sources be closer than 20 feet from inlets,swales,drainage • No chemical waste shall be buried,burned or otherwise disposed of onsite. ways,channels,and other waters. Education • Use secondary containment controls for all hazardous materials. Containment shall be a minimum Instruct workers on safe chemical storage and disposal procedures. •size of 110 percent of the largest chemical container stored within the containment. • • If an earthen pit or berm is used for secondary containment,it shall be lined with plastic or other Instruct workers in identification of chemical pollutants and proper methods to contain them during material that is compatible with the chemical being stored. storage and use. • • Chemical and hazardous material storage shall be in accordance with Federal and State of Texas Educate workers of potential dangers to humans and the environment from chemical pollutants. regulations and with the municipality's fire codes. • Educate all workers on chemical storage and disposal procedures. • Storage locations shall have appropriate placards for emergency responders. • Have regular meetings to discuss and reinforce identification, handling and disposal procedures • Containers shall be kept closed except when materials are added or removed. (incorporate in regular safety seminars). • Chemicals shall be dispensed using drip pans or within a lined, bermed area or using other • Establish a program to train new employees. spill/overflow protection measures. Quality Control Washout Procedures • Designated personnel shall monitor onsite chemical storage,use,and disposal procedures. • Many chemicals(e.g.stucco,paint,form release oils,curing compounds)used during construction • Educate and if necessary,discipline workers who violate procedures. may require washing of applicators or containers after use. The discharge of this wash water is prohibited. • Retain trip reports and manifests that document the recycling or disposal location for all chemical, special,and hazardous wastes that all hauled from the site. • Wash water shall be collected in containers,labeled,and classified for correct waste disposal. • A licensed waste hauler shall be used for wash water. 4.1.4 Design Guidance and Specifications Chemical and Hazardous Waste Handling National guidance for response procedures are established by the Environmental Protection Agency • Ensure that adequate waste storage volume is available. (EPA)in the Code of Federal Regulations(CFR). Specific sections addressing spills are govemed by: • • Ensure that waste collection containers are conveniently located and compatible with the waste• CFR Part 261 Identification and Listing of Hazardous Waste. chemicals. • 40 CFR Part 262 Standards Applicable to Generators of Hazardous Waste. • Waste containers shall have lids and be emptied or hauled for disposal when they are 90 percent full • 40 CFR Part 263 Standards Applicable to Transporters of Hazardous Waste. or more frequently. • 49 CFR Parts 171-178 of the Transportation Hazardous Materials Regulations. • Segregate potentially hazardous waste from non-hazardous construction waste and debris. Chemical Management CC-180 Chemical Management CC-181 Revised 04/10 Revised 04/10 iSW Mm Technical Manual Construction Controls iSW MT"Technical Manual Construction Controls Guidance for storing,labeling,and managing hazardous waste in the State of Texas are established by 4.2 Concrete Sawcutting Waste Management the Texas Commission on Environmental Quality(TCEQ)in the Texas Administrative Code Title 30, g as ana g Chapter 335,Industrial Solid Waste and Municipal Hazardous Waste. Waste Control No specification for chemical management measures is currently available in the Standard Specifications Description: Sawcutting of concrete pavement is a routine practice used to control shrinkage for Public Works Construction—North Central Texas Council of Governments. cracking immediately following placement of plastic concrete. It is also used to remove curb sections and pavement sections for pavement repairs,utility trenches,and driveways. Sawcutting for joints involves sawing a narrow,shallow grove in the concrete,while sawcutting for removals is usually 4.1.5 Inspection and Maintenance Requirements done full depth through the slab. Water is used to control saw blade temperature and to flush the Chemical management measures should be inspected regularly(at least as often as required by the detritus from the sawed groove. The objective of concrete sawcutting waste management is to TPDES Construction General Permit)for proper storage and evidence of leaks or spills. Check that all prevent the resulting slurry of process water and fine particles with its high pH from becoming a water chemicals,hazardous materials,and wastes are properly stored and labeled. If not stored properly,take pollutant. corrective action,and reinforce procedures through re-education of employees. If leaks or spills have occurred,check that proper clean up and reporting procedures have been followed. KEY CONSID RAT1ON5 APPLICATIONS If procedures have not been followed,take corrective action. Check that all employees have been trained DESIGN CRITERIA: Perimeter Control in spill and leak procedures as detailed in Section 4.8 Spill and Leak Response Procedure. • Prohibit discharge of untreated slurry - • Educate employees on proper procedures Slope Protection • Continuously vacuum slurry and cuttings during Sediment Barrier sawcutting operation Channel Protection • Block inlets to prevent discharges • Establish an onsite containment area (minimum 1 ft Temporary Stabilization freeboard)if immediate disposal of the vacuumed slurry Final Stabilization is not feasible • Water evaporation and concrete recycling are the Waste Management recommended disposal methods when slurry is not Housekeeping Practices vacuumed LIMITATIONS: • Only one part of concrete waste management Or1PIEH1EIIATR�41 • Does not address concrete demolition waste CONSIDERATIONS MAINTENANCE REQUIREMENTS: 0 Capital Costs • Check for uncollected slurry after all sawcutting 'p Maintenance operations • Inspect collection areas and repair containment as • Training needed 0 Suitability for Slopes>5% • Dispose of sediment and cuttings when collection area volume is reduced by 50 percent • Train new employees and regularly re-train all Other Considerations: employees • Coordinate with concrete waste management TARGETED POLLUTANTS O Sediment • Nutrients&Toxic Materials O Oil&Grease O Floatable Materials • Other Construction Wastes Chemical Management CC-182 Concrete Sawcutting Waste Management CC-183 Revised 04/10 Revised 04/10 iSW MrC Technical Manual Construction Controls iSW Mm Technical Manual Construction Controls • Onsite evaporation of slurry water and recycling of the concrete waste is the preferred disposal 4.2.1 Primary Use method. When this is not feasible, discharge from the collection area shall only be allowed if a passive treatment system is used to remove the fines. Criteria are in Section 3.7 Passive Treatment Pavement sawcutting is performed on almost all construction projects that include removal or installation System. Mechanical mixing is required in the collection area. The pH must be tested,and discharge of pavement. Properly managing the slurry and cuttings from sawcutting prevents them from affecting is allowed only if the pH does not exceed 8.0. The pH may be lowered by adding sulfuric acid to the surface and ground water resources. slurry water. Dewatering of the collection area after treatment shall follow the criteria in Section 3.3 Dewatering Controls. 4.2.2 Applications • Care shall be exercised when treating the slurry water for discharge. Monitoring must be Concrete sawcutting waste management is applicable on construction activities where sawcutting is part implemented to verify that discharges from the collection area do not violate groundwater or surface of the work, regardless of the size of the total area disturbed. It is also applicable on repair and water quality standards. maintenance projects that may not be required to implement erosion and sediment controls. • Geotextile fabrics such as those used for silt fence should not be used to control sawcutting waste, Concrete sawcutting waste management is based on the proper collection and disposal of the slurry and since the grain size is significantly smaller than the apparent opening size of the fabric. cuttings. Employee education is critical to ensuring correct procedures are followed. • Use waste and recycling haulers and facilities approved by the local municipality. Education 4.2.3 Design Criteria • Supervisors must be made aware of the potential environmental consequences of improperly • Construction plan notes shall include proper concrete sawcutting waste management procedures. handling sawcutting slurry and waste. • The contractor should be required to designate the site superintendent,foreman,or other person who • Train all workers performing sawcutting operations on the proper slurry and cuttings collection and is responsible for concrete sawcutting to also be responsible for concrete sawcutting waste disposal procedures. management. Slurry Collection 4.2.4 Design Guidance and Specifications • During sawcutting operations,the slurry and cuttings shall be continuously vacuumed or otherwise No specification for concrete sawcutting waste management is currently available in the Standard recovered and not be allowed to discharge from the site. Specifications for Public Works Construction—North Central Texas Council of Governments. • If the pavement to be cut is near a storm drain inlet,the inlet shall be blocked by sandbags or equivalent temporary measures to prevent the slurry from entering the inlet. Remove the sandbags 4.2.5 Inspection and Maintenance Requirements immediately after completing sawcutting operations,so they do not cause drainage problems during storm events. Concrete sawcutting waste management measures should be inspected regularly(at least as often as required by the TPDES Construction General Permit). Project personnel should inspect the operations to • The slurry and cuttings shall not be allowed to remain on the pavement to dry out. assure that operators are diligent in controlling the water produced by the sawcutting activities. Slurry Disposal Pavement should be inspected each day after operations to ensure that waste removal has been adequately performed. Residual waste should be cleaned. Reinforce proper procedures with workers. • Develop pre-determined,safe slurry disposal areas. Inspect the collection area for signs of unauthorized discharges. Repair containment area as needed. • Collected slurry and cuttings should be immediately hauled from the site for disposal at a waste Remove sediment and fines when the collection area volume is reduced by 50 percent. facility. If this is not possible,the slurry and cuttings shall be discharged into onsite containment. • The onsite containment may be an excavated or bermed pit lined with plastic that is a minimum of 10 millimeters thick. Refer to Section 4.3 Concrete Waste Management for additional design criteria and an example schematic. If the project includes placement of new concrete,slurry from sawcutting may be disposed of in facilities designated for the washout of concrete trucks instead constructing a separate containment. • The containment shall be located a minimum of 50 feet away from inlets,swales,drainage ways, channels,and other waters,if the site configuration provides sufficient space to do so. In no case shall the collection area be closer than 20 feet from inlets,swales,drainage ways,channels and other waters. • Several,portable,pre-fabricated,concrete washout,collection basins are commercially available and are an acceptable alternative to an onsite containment pit. • Remove waste concrete when the containment is half full. Always maintain a minimum of one foot freeboard. Concrete Sawcutting Waste Management CC-184 Concrete Sawcutting Waste Management CC-185 Revised 04/10 Revised 04/10 iSW MT""Technical Manual Construction Controls iSW M'"'Technical Manual Construction Controls 4.3 Concrete Waste Management 4.3.1 Primary Use Concrete waste management is used to prevent the discharge of concrete wash water and waste into Waste Control stormwater runoff. A number of water quality parameters can be affected by the introduction of concrete, Description:Concrete waste at construction sites comes in two forms:1)excess fresh concrete especially fresh concrete. Concrete affects the pH of runoff,causing significant chemical changes in mix,including residual mix washed from trucks and equipment,and 2)concrete dust and concrete water bodies and harming aquatic life. Suspended solids in the form of both cement and aggregated dust debris resulting from demolition. Both forms have the potential to impact water quality through are also generated from both fresh and demolished concrete waste. stormwater runoff contact with the waste. The objective of concrete waste management is to dispose of these wastes in a manner that protects surface and ground water 4.3.2 Applications KEY CONSIDERATIONS APPLICATIONS Concrete waste management is applicable to all construction sites where existing concrete is being demolished or new concrete is being placed,regardless of the size of the total area disturbed. It is also DESIGN CRITERIA: Perimeter Control applicable on repair and maintenance projects that may not be required to implement erosion and • Prohibit the discharge of untreated concrete washout sediment controls. water Slope Protection • Prohibit dumping waste concrete anywhere except at Sediment Barrier 4.3.3 Design Criteria pre-determined,regulated,recycling or disposal sites g Channel Protection • Provide a washout containment with minimum of 6 • The discharge of washout water to an inlet,Swale,or any portion of the storm drainage system or a cubic feet of containment volume for every 10 cubic Temporary Stabilization natural drainage system(e.g.channel)shall be prohibited. yards of concrete placed Final Stabilization • Construction plan notes shall state that the discharge of concrete washout to anything except a • Minimum 1 foot freeboard on containment • Minimum 10 mil plastic lining of containment Waste Management designated containment area is prohibited. • Washout water evaporation and concrete recycling are Housekeeping Practices • Show the location of the concrete washout containment on the drawings,or require the contractor to the recommended disposal methods provide this information. • Educate drivers and operators on proper disposal and • The contractor should be required to designate the site superintendent,foreman,or other person who equipment cleaning procedures is responsible for concrete placement to also be responsible for concrete waste management. LIMITATIONS: IMPIEh1EN1AT/ONCOH$IDERATIL7NS, Unacceptable Waste Concrete Disposal Practices • Does not address concrete sawcutting waste Q Capital Costs • Dumping in vacant areas on the job-site. C Maintenance MAINTENANCE REQUIREMENTS: • Illicit dumping onto off-site lots or any other placed not permitted to receive construction demoliotion • Inspect regularly • Training debris. • Check for and repair any damage to washout 0 Suitability for Slopes>5% • Dumping into ditches,drainage facilities,or natural water ways. containment areas • Clean up any overflow of washout pits Other Considerations: • Using concrete waste as fill material or bank stabilization. • Regularly remove and properly dispose of concrete None Recommended Disposal Procedures •waste • Identify pre-determined,regulated,facilities for disposal of solid concrete waste. Whenever possible, TARGETED POLLUTANTS haul the concrete waste to a recycling facility. Disposal facilities must have a Class IV(or more stringent)municipal solid waste permit from the TCEQ. o Sediment • A concrete washout pit or other containment shall be installed a minimum of 50 feet away from inlets, • Nutrients&Toxic Materials swales,drainage ways,channels,and other waters,if the site configuration provides sufficient space o Oil&Grease to do so. In no case shall concrete washout occur closer than 20 feet from inlets,swales,drainage ways,channels and other waters. o Floatable Materials • Provide a washout area with a minimum of 6 cubic feet of containment volume for every 10 cubic • Other Construction Wastes yards of concrete poured. Alternatively,the designer may provide calculations sizing the containment based on the number of concrete trucks and pumps to be washed out. • The containment shall be lined with plastic(minimum 10 millimeters thick)or an equivalent measure to prevent seepage to groundwater. • Mosquitoes do not typically breed in the high pH of concrete washout water. However,the concrete washout containment should be managed in a manner that prevents the collection of other water that could be a potential breeding habitat. Concrete Waste Management CC-186 Concrete Waste Management CC-187 Revised 04/10 Revised 04/10 iSW Mr"Technical Manual Construction Controls iSW M'"'Technical Manual Construction Controls o Do not excavate the washout area until the day before the start of concrete placement to Demolition Practices minimize the potential for collecting stormwater. • Monitor weather and wind direction to ensure concrete dust is not entering drainage structures and o Do not discharge any water or wastewater into the containment except for concrete washout to surface waters. prevent dilution of the high pH environment that is hostile to mosquitoes. o Remove the waste concrete and grade the containment closed within a week of completing • Spray water on structures being demolished to wet them before start of demolition operations. Reapply water whenever dust is observed. concrete placement. Do not leave it open to collect stormwater. o If water must be pumped from the containment,it shall be collected in a tank,neutralized to lower • Construct sediment traps or other types of sediment detention devices downstream of demolition the pH,and then hauled to a treatment facility for disposal. Alternatively,it may be hauled to a activities to capture and treat runoff from demolition wetting operations. batch plant that has an onsite collection facility for concrete washout water. o Do not pump water directly from the containment to the Municipal Separate Storm Sewer System 4.3.4 Design Guidance and Specifications or a natural drainage way without treating for removal of fine particles and neutralization of the No specification for concrete waste management is currently available in the Standard Specifications for PH. Public Works—North Central Texas Council of Govememtns. • Multiple concrete washout areas may be needed for larger projects to allow for drying time and proper disposal of the washout water and waste concrete. 4.3.5 Inspection and Maintenance Requirements • Portable, pre-fabricated, concrete washout containers are commercially available and are an Concrete waste management controls should be inspected regularly(at least as often as required by the acceptable alternative to excavating a washout area. TPDES Construction General Permit)for proper handling of concrete waste. Check concrete washout • Evaporation of the washout water and recycling of the concrete waste is the preferred disposal pits and make repairs as needed. Washout pits should not be allowed to overflow. Maintain a schedule method.After the water has evaporated from the washout containment,the remaining cuttings and to regularly remove concrete waste and prevent over-filling. fine sediment shall be hauled from the site to a concrete recycling facility or a solid waste disposal If illicit dumping of concrete is found,remove the waste and reinforce proper disposal methods through facility. education of employees. • Remove waste concrete when the washout containment is half full. Always maintain a minimum of one foot freeboard. 4.3.6 Example Schematics • Use waste and recycling haulers and facilities approved by the local municipality. The following schematics are example applications of the construction control. They are intended to • When evaporation of the washout water is not feasible,discharge from the collection area shall only assist in understanding the control's design and function. be allowed if a passive treatment system is used to remove the fines. Criteria are in Section 3.7 The schematics are not for construction. They may serve as a starting point for creating a construction Passive Treatment System. Mechanical mixing is required within the containment for passive detail,but they must be site adapted by the designer. In addition,dimensions and notes appropriate for treatment to be effective. The pH must be tested,and discharge is allowed only if the pH does not the application must be added by the designer. exceed 8.0. The pH may be lowered by adding sulfuric acid to the water. Dewatering of the collection area after treatment shall follow the criteria in Section 3.3 Dewatering Controls. • Care shall be exercised when treating the concrete washout water for discharge. Monitoring must be implemented to verify that discharges do not violate groundwater or surface water quality standards. • On large projects that are using a nearby batch plant,a washout facility associated with the plant and under the plant's TPDES Multi-Sector General Permit may be used instead of installing an onsite containment area for truck washout. Education • Drivers and equipment operators should be instructed on proper disposal and equipment washing practices(see above). • Supervisors must be made aware of the potential environmental consequences of improperly handled concrete waste. Enforcement • The construction site manager or foreman must ensure that employees and pre-mix companies follow proper procedures for concrete disposal and equipment washing. • Employees violating disposal or equipment cleaning directives must be re-educated or disciplined if necessary. Concrete Waste Management CC-188 Concrete Waste Management CC-189 Revised 04/10 Revised 04/10 iSW M'"'Technical Manual Construction Controls iSW M'N Technical Manual Construction Controls 4.4 Debris and Trash Management Waste Control Description: Large volumes of debris and trash are often generated at construction sites,including packaging,pallets,wood waste,personal trash,scrap material,and a variety of other wastes. The EDGE OF objective of debris and trash management is to minimize the potential of stormwater contamination PLASTIC LINING- from solid waste through appropriate storage and disposal practices. Recycling of construction debris is encouraged to reduce the volume of material to be disposed of and associated costs of disposal --10'MINIMUM--. 1 SANDBAG 0 KEY CONSIDERATIONS APPUCAT1ONS 7 T/._//I G DESIGN CRITERIA: A 0 A Perimeter Control tt • Implement a job-site waste handling and disposal w L education and awareness program Slope Protection o B ! • Provide sufficient and appropriate waste storage Sediment Barrier > _' ' containers Channel Protection C' 0 • Provide timely removal of stored solid waste materials --- V I- , • Train workers and monitor compliance Temporary Stabilization 0 Final Stabilization 10 MIL PLASTIC LININ LIMITATIONS: • Only addresses non-hazardous solid waste Waste Management • One part of a comprehensive construction site waste Housekeeping Practices management program CONCRETE WASHOUT PLAN VIEW MAINTENANCE REQUIREMENTS: N.T.S. • Inspect regularly IMPL EMENTATION • Empty waste containers regularly CONSIDERATIONS • Clean up loose trash and debris daily p Capital Costs • Verify procedures are being followed • Train new employees and regularly re-train all employees G Maintenance rMIN • Training 10 MIL PLASTIC I O Suitability for Slopes>5% LINING . I-SANDBAG TARGETED POLLUTANTS j r,•,., 0 Sediment Other Considerations: j • Nutrients&Toxic Materials None r? _ 0 Oil&Grease 1--11 • Floatable Materials • Other Construction Wastes CONCRETE WASHOUT SECTION A-A N.T.S. NOTE:SANDBAGS MAY BE REPLACED BY A SOIL BERM TO ANCHOR THE PLASTIC LINING. Figure 4.1 Schematics of Concrete Washout Containment Concrete Waste Management CC-190 Debris and Trash Management CC-191 Revised 04/10 Revised 04/10 iSW M'""Technical Manual Construction Controls iSW M-r"'Technical Manual Construction Controls In no case shall material and waste sources be closer than 20 feet from inlets,swales,drainage 4.4.1 Primary Use ways,channels,and other waters. Debris and trash management is used to minimize floatables and other wastes in stormwater. By • Construction waste and trash shall be stored in a manner that minimizes its exposure to precipitation controlling the trash and debris onsite,stormwater quality is improved and the need for extensive clean and stormwater runoff. up upon completion of the project is reduced. • Whenever possible,minimize production of debris and trash. • Instruct construction workers in proper debris and trash storage and handling procedures. 4.4.2 Applications • Segregate potentially hazardous waste from non-hazardous construction site debris. Hazardous Debris and trash management is applicable on all construction sites where workers are present. Even if waste shall be managed according to the criteria in Section 4.1 Chemical Management. the only construction activity is earthwork,workers will still have drink bottles,lunch bags,and other wastes that must be managed. • Segregate recyclable or re-usable construction debris from other waste materials. A goal of re-using Solid waste management for construction sites is based on proper storage and disposal practices by or recycling 50 percent of the construction debris and waste is recommended. construction workers and supervisors. Key elements of the program are education and modification of • Keep debris and trash under cover in either a closed dumpster or other enclosed trash container that improper disposal habits. Cooperation and vigilance is required on the part of supervisors and workers to limits contact with rain and runoff and prevents light materials from blowing out. ensure that the procedures are followed. • Check the municipality's storage requirements. Some municipalities have specific requirements for The following are lists describing the type of targeted materials. the size and type of waste containers for construction sites. • Construction(and Demolition)Debris: • Do not allow trash containers to overflow. Do not allow waste materials to accumulate on the ground. Dimensional lumber • Prohibit littering by workers and visitors. Miscellaneous wood(pallets,plywood,etc) • Police site daily for litter and debris. Copper(pipe and electrical wiring) • Enforce solid waste handling and storage procedures. Miscellaneous metal(studs,pipe,conduit,sheathing,nails,etc) Disposal Procedures Insulation • If feasible,recycle construction and demolition debris such as wood,metal,and concrete. Brick and mortar • Trash and debris shall be removed from the site at regular intervals that are scheduled to empty Shingles containers when they are 90 percent full or more frequently. Roofing materials • General construction debris may be hauled to a licensed construction debris landfill(typically less Gypsum board expensive than a sanitary landfill). • Trash: • Use waste and recycling haulers/facilities approved by the local municipality. Paper and cardboard(packaging,containers,wrappers) • No waste,trash,or debris shall be buried,burned or otherwise disposed of onsile. Plastic(packaging,bottles,containers) • Cleared trees and brush may be burned if authorized by the municipality and proper permits are obtained from the county and/or TCEQ. Chipping of trees and brush for use as mulch is the preferred Styrofoam(cups,packing,and forms) alternative to burning or offsite disposal. Food and beverage containers Education Food waste • Educate all workers on solid waste storage and disposal procedures. • Instruct workers in identification of solid waste and hazardous waste. 4.4.3 Design Criteria • Construction plan notes shall include proper debris and trash management procedures. • Have regular meetings to discuss and reinforce disposal procedures(incorporate in regular safety seminars). • Show the location of waste storage containers on the drawings,or require the contractor to add this • Clearly mark on all debris and trash containers which materials are acceptable. information. • The contractor should be required to designate a site superintendent,foreman,safety officer,or other Quality COntrO1 senior person who is onsite daily to be responsible for implementing debris and trash management. • Foreman and/or construction supervisor shall monitor onsite solid waste storage and disposal Storage Procedures procedures. • Check the site,particularly areas frequented by workers during lunch and breaks,for loose trash and • All waste sources and storage areas shall be located a minimum of 50 feet away from inlets,swales, debris and the end of each work day. drainage ways,channels and other waters,if the site configuration provides sufficient space to do so. Debris and Trash Management CC-192 Debris and Trash Management CC-193 Revised 04/10 Revised 04/10 iSW MT""Technical Manual Construction Controls iSW M'"Technical Manual Construction Controls • Discipline workers who repeatedly violate procedures. 4.5 Hyper-Chlorinated Water Management 4.4.4 Design Guidance and Specifications Waste Control No specification for debris and trash management measures is found currently available in the Standard Description: Hyper-chlorinated water is routinely used to disinfect new waterlines and Specifications for Public Works Construction—North Central Texas Council of Governments. appurtenances. Chlorine protects humans from pathogens in water, but it is toxic to aquatic ecosystems. The objective of hyper-chlorinated water management is to discharge the water in a manner that protects surface water and related aquatic ecosystems. 4.4.5 Inspection and Maintenance Requirements Debris and trash management measures should be inspected regularly(at least as often as required by KEYCONSIDERATYONS APPIJCATIONS the TPDES Construction General Permit). If waste containers are overflowing,call the waste hauler DESIGN CRITERIA; immediately for a pick-up. If loose trash and debris are found around the site,reinforce proper waste Perimeter Control management procedures through education of workers. • Educate employees on proper procedures • Discharge to sanitary sewer if the system operator Slope Protection Construction sites must maintain separate waste containers clearly marked for non-hazardous, approves hazardous and recyclable waste. Check solid waste containers for chemical, special, or hazardous PP Sediment Barrier •wastes that are improperly laced in them. These wastes shall be removed and handled according to Discharge water onsite for natural chlorine attenuation placed 9 Channel Protection criteria in Section 4.1 Chemical Management. • Use appropriate dosage for chemical de-chlorination based on chemical used and chlorine concentration. Temporary Stabilization site should be checked for loose litter and debris at the end of each working day. • Chlorine concentration must be less than 4 ppm before Final Stabilization leaving the site • Use velocity dissipation devices for discharges Waste Management • Always monitor receiving waters for negative effects Housekeeping Practices • Discharge to sanitary sewer limited by sewer capacity IMPWfENIATION • Discharges limited to areas without vegetation that is to '; CONSIDERATIONS be preserved • Wet,cool,and overcast days limits chlorine attenuation G Capital Costs and removal o Maintenance MAINTENANCE REQUIREMENTS: • Training • Monitor continuously during discharge 0 Suitability for Slopes>5 • Check for and repair any erosion caused by discharge • Sample and test receiving water hourly for chlorine Other Considerations: • None TARGETED POLLUTANTS o Sediment • Nutrients&Toxic Materials o Oil&Grease o Floatable Materials o Other Construction Wastes Debris and Trash Management CC-194 Hyper-Chlorinated Water Management CC-195 Revised 04/10 Revised 04/10 iSW M'Technical Manual Construction Controls iSW Mr'Technical Manual Construction Controls 4.5.1 Primary Use • Natural attenuation of the chlorine may be aided by aeration. Air can be added to the water by Hyper-chlorinated water is used to disinfect new water lines. directing the discharge over a rough surface(e.g.riprap)before it enters the temporary retention area or an aeration device(e.g.circulation pump)can be placed in the retention area. • Onsite discharge may require several hours to a few days before the water is safe to discharge. The 4.5.2 Applications rate at which chlorine will attenuate is affected by soil conditions and weather conditions. Attenuation Construction sites that install new water lines or repair or replace existing water lines should use hyper- will occur quickest during warm,sunny,dry periods. chlorinated water management measures. • If the hyper-chlorinated water is retained in a pit or basin,and then pumped to discharge,pumping shall follow the criteria in Section 3.3 Dewatering Controls. 4.5.3 Design Criteria Chemical Dechlorination • Drawing notes shall include procedures for the proper discharge of hyper-chlorinated water from • If non-chemical means of dechlorination are not feasible, chemical methods may be used to waterline disinfection. neutralize the chlorine before discharging the hyper-chlorinated water. • The contractor should be required to designate the site superintendent,foreman,or other person who • Vitamin C in the form of ascorbic acid or sodium ascorbate is the preferred dechlorination agent. is responsible for water line disinfection to also be responsible for hyper-chlorinated water management. • Consider the National Fire Protection Association (NFPA) rating when selecting a dechlorination • Educate employees about the environmental hazards of high chlorine concentrations and the proper chemical. The NFPA rating is given by a series of three numbers ranging from 0 to 4,with 0 being no risk and 4 the highest risk. The sequence of numbers rank the health hazard,flammability risk and procedures for handling hyper-chlorinated water. reactivity risk of the chemical. A NFPA rating of 0,0,0 indicates no risk for all three categories. • Hyper-chlorinated water shall not be discharged to the environment unless the chlorine concentration • Ensure appropriate personal protective equipment(PPE)is specified for workers depending on the is reduced to 4 ppm or less by chemically treating to dechlorinate or by onsite retention until natural chemical being used to neutralize the chlorine. attenuation occurs. • The chemicals listed in Table 4.1 may be used to neutralize chlorine. • Water with a measurable chlorine concentration of less than 4 ppm is considered potable and an authorized discharge;however,large volumes of water with chlorine at this concentration can still be - - ' Table 4.1 Chemical Dechlorination Agents and Approximate Dosages toxic to aquatic ecosystems. Do not discharge water that has been de-chlorinated to 4 ppm directly Dedliodnatkr &dint Rate : Advaita ee Disadvantage; to surface water. It shall be discharged onto vegetation or through a conveyance system for further Allem ( A ent: attenuation of the chlorine before it reaches surface water. r Maine) • Discharges of high flow rate and velocities shall be directed to velocity dissipation devices. Ascorbic Acid 2.5:1 • Not toxic to aquatic species • May lower pH in receiving Discharge to Sanitary Sewers (form of • Quick reaction time water 9 Y Vitamin C) • NFPA rating of 0,0,0 • The preferred method of disposal for hyper-chlorinated water is discharge into a sanitary sewer Sodium 2.8:1 • Does not affect pH • Greater amount needed than system. Ascorbate • Not toxic to aquatic species Ascorbic Acid (form of • Quick reaction time • More expensive • Permission from the sanitary sewer operator must be obtained to discharge to the sanitary sewer. Vitamin C) • NFPA rating of 0,0,0 • Limitations on discharges to the sanitary sewer are the capacity of the sanitary sewer and the Sodium 2:1 to 7:1 • Less expensive • Must calculate dosage based availability of a sewer manhole near the construction site. Thiosulfate depending on • Readily available on pH pH • Long history of use • Skin,eye,nose and throat • The designer shall verify that the sanitary sewer is capable of receiving the flow rate that will result (familiarity) irritant from dewatering the disinfected line within the required time. Consumes oxygen in water •• Consideration should be given to timing the discharge with the daily low flow period for the sanitary • May encourage bacterial sewer system. growth in receiving streams Onsite Discharge Calcium 1:1 to 0.5:1 • Less expensive • Must calculate dosage based Thiosulfate depending on • Not toxic to aquatic species on pH • Hyper-chlorinated water may be applied to the construction site if it can be done without causing a pH • NFPA rating of 0,0,0 • Over-dosing produces discharge. The feasibility of this option is dependent on the volume of water, the size of the suspended solids construction site,and the conditions of the site. Site application should not be done when the soil • Over-dosing may increase moisture content is high due to recent storm events. turbidity in receiving water • May encourage bacterial • Chlorine can bum vegetation,so it should not be used to water vegetation that is being used for growth in receiving streams stabilization,vegetated filters or buffers,or other vegetation to be preserved. • Hyper-chlorinated water may be discharged to an onsite retention area until natural attenuation • The designer shall confirm dosages with the chemical supplier before using the dechlorination agent. occurs. The area may be a dry stormwater retention basin,or a portion of the site may be graded to form a temporary pit or bermed area. Hyper-Chlorinated Water Management CC-196 Hyper-Chlorinated Water Management CC-197 Revised 04/10 Revised 04/10 1SW Mi"Technical Manual Construction Controls iSW Mr"Technical Manual Construction Controls • Chlorine and residual agent concentrations and the pH of the discharged water shall be monitored at least hourly using field tests. 4.6 Sandblasting Waste Management • The treated water should be discharged onto pavement or into a dry conveyance system to allow waste Control aeration and reaction time before the dechlorinated water reaches the receiving water. The receiving Description: The objective of sandblasting waste management is to minimize the potential of water should be closely monitored for any signs of negative effects from the discharge. stormwater quality degradation from sandblasting activities at construction sites. The key issues in this program are prudent handling and storage of sandblast media,dust suppression,and proper collection and disposal of spent media. It is not the intent of this control to outline all of the worker 4.5.4 Design Guidance and Specifications safety issues pertinent to this practice. Safety issues should be addressed by construction safety No specification for hyper-chlorinated water management is currently available in the Standard programs as well as local,state,and federal regulations. Specifications for Public Works Construction—North Central Texas Council of Governments. KEYCONSIDERAITONS APPLICATIONS 4.5.5 Inspection and Maintenance Requirements DESIGN CRITERIA: Perimeter Control Hyper-chlorinated water management measures should be monitored continuously while the hyper- • Prohibit discharge of sandblasting waste chlorinated water is being discharged. Discharges to a sanitary sewer should be monitored for back-ups Provide site specific fugitive dust control and Slope Protection or overflows that indicate the discharge is exceeding the sewer's capacity. If these occur,the rate of containment equipment Sediment Barrier discharge must be decreased or another discharge method is needed. • Educate employees on proper procedures Channel Protection • Provide proper sandblast equipment for the job Onsite or chemically treated discharge should be monitored for chlorine and residual chemical • Ensure compliance by supervisors and workers Temporary Stabilization concentrations. Verify that discharges are not causing erosion,and modify the discharge to use velocity dissipation devices if erosion is occurring. Repair any eroded areas. If water is being pumped from a LIMITATIONS: Final Stabilization temporary retention area,verify that appropriate dewatering controls are in place. Waste Management • Does not address hazardous materials that may be For all discharges,frequently inspect the receiving water for any evidence of negative effects. Sample present in the waste Housekeeping Practices and test the receiving water hourly for chlorine. Stop the discharge immediately if chlorine is detected • Does not address spill and leak response procedures and modify the discharge procedures before resuming. MAINTENANCE REQUIREMENTS: • Inspect regularly IMPLEMENTATION • Contain and dispose of sandblast grit CONSIDERATIONS • Train new employees and regularly re-train all employees -• Capital Costs • Maintenance TARGETED POLLUTANTS • Training O Sediment 0 Suitability for Slopes>5% • Nutrients&Toxic Materials Other Considerations: O Oil&Grease • OSHA requirements • Floatable Materials • Special procedures for sandblasting operations on • Other Construction Wastes structures know to contain hazardous materials • Possible site assessment or required if hazardous materials present Hyper-Chlorinated Water Management CC-198 Sandblasting Waste Management CC-199 Revised 04/10 Revised 04/10 ISWM'"Technical Manual Construction Controls iSWMr"Technical Manual Construction Controls • Instruct all onsite employees of the potential hazardous nature of sandblast grit and the possible 4.6.1 Primary Use symptoms of over-exposure to sandblast grit. Sandblasting is typically used to clean a surface or prepare a surface for coatings. Since the • Instruct operators of sandblasting equipment on safety procedures and personal protection sandblasting media consists of fine abrasive granules,it can be easily transported by running water. equipment. Sandblasting activities typically create a significant dust problem that must be contained and collected to Instruct operators on proper procedures regarding storage,handling and containment of sandblast •prevent off-site migration of fines. Particular attention must be paid to sandblasting work on bridges,box grit. culverts,and head walls that span or are immediately adjacent to streams and waterways. • Instruct operators and supervisors on current local,state and federal regulations regarding fugitive dust and hazardous waste from sandblast grit. 4.6.2 Applications • This control should be implemented when sandblasting operations will occur on a construction site. Have weekly meetings with operators to discuss and reinforce proper operational procedures. • If a discharge of sandblasting waste occurs,it shall be considered a spill and handled according to the Establish a continuing education program to indoctrinate new employees. criteria in Section 4.8 Spill and Leak Response Procedures. Materials Handling Recommendations • Sandblast media should always be stored under cover away from drainage structures. 4.6.3 Design Criteria • Ensure that stored media or grit is not subject to transport by wind. • Construction plan notes shall include proper sandblasting waste management procedures. • Ensure that all sandblasting equipment and storage containers comply with current local,state and • The contractor should be required to designate the site superintendent,foreman,or other person who federal regulations. is responsible for sandblasting to also be responsible for sandblasting waste management. • Refer to Section 4.1 Chemical Management if sandblast grit is known or suspected to contain • Prohibit the discharge of sandblasting waste. hazardous components. Operational Procedures • Capture and treat runoff,which comes into contact with sandblasting material or waste. • Use only inert,non-degradable sandblast media. Quality Assurance • Use appropriate equipment for the job;do not over-blast. • Foreman and/or construction supervisor should monitor all sandblasting activities and safety • Wherever possible,blast in a downward direction. procedures. • Install a windsock or other wind direction instrument. • Educate and if necessary,discipline workers who violate procedures. • Cease blasting activities in high winds or if wind direction could transport grit to drainage facilities. • Take all reasonable precautions to ensure that sandblast grit is not transported off-site or into drainage facilities. • Install dust shielding around sandblasting areas. • Collect and dispose of all spent sandblast grit, use dust containment fabrics and dust collection 4.6.4 Design Guidance and Specifications hoppers and barrels. No specification for sandblasting waste management is currently available in the Standard Specifications • Non-hazardous sandblast grit may be disposed in permitted construction debris landfills or permitted for Public Works Construction—North Central Texas Council of Governments. sanitary landfills. • If sandblast media cannot be fully contained,construct sediment traps downstream from blasting area 4.6.5 Inspection and Maintenance Requirements where appropriate. Sandblasting waste management measures should be inspected regularly(at least as often as required • Use sand fencing where appropriate in areas where blast media cannot be fully contained. by the TPDES Construction General Permit). Verify that sandblasting grit is contained and disposed of • If necessary, install misting equipment to remove sandblast grit from the air prevent runoff from properly. Check for downstream locations and the off-site perimeter for evidence of discharges or off-site misting operations from entering drainage systems. transport by wind. • Use vacuum grit collection systems where possible. Check that daily records of sandblasting activities are current. Hold weekly meetings with operators to reinforce proper procedures. Regularly re-educate employees on potential dangers and hazards,safety • Keep records of sandblasting materials,procedures,and weather conditions on a daily basis. procedures and proper handling. • Take all reasonable precautions to ensure that sandblasting grit is contained and kept away from drainage structures. Educational Issues • Educate all onsite employees of potential dangers to humans and the environment from sandblast grit. Sandblasting Waste Management CC-200 Sandblasting Waste Management CC-201 Revised 04/10 Revised 04/10 iSW Mr"Technical Manual Construction Controls iSW Mrw.Technical Manual Construction Controls 4.7 Sanitary Waste Management 4.7.1 Primary Use Waste Control Sanitary facilities are used to properly store and dispose of sanitary wastes that are generated onsite. Description:The objective of sanitary waste management is to provide for collection and disposal of sanitary waste in a manner that minimizes the exposure to precipitation and stormwater. This is most 4.7.2 Applications often accomplished by providing portable facilities for construction site workers. pp Sanitary facilities should be available to workers at all construction sites. If permanent facilities are not KEYOONSIDERATK)NS APPUCATJONS available,portable toilets are placed at the construction site. DESIGN CRITERIA: Perimeter Control • Provide sanitary facilities at the rate of one toilet per 10 4.7.3 Design Criteria workers for a 40-50 hour work week Slope Protection Construction plan notes shall include requirements for the contractor to provide an appropriate • Locate portable toilets a minimum of 50 feet away from Sediment Barrier number of portable toilets based on the number of employees using the toilets and the hours they will storm drain inlets, conveyance channels or surface Channel Protection work. The typical standard is one portable toilet per 10 workers for a 40-50 hour work week. waters • • If unable to meet the 50 foot requirement, locate Temporary Stabilization The location of portable toilets shall be shown on the drawings. portable toilets at least 20 feet away and provide Final Stabilization • Sanitary facilities shall be placed a minimum of 50 feet away from storm drain inlets,conveyance secondary containment channels or surface waters. If unable to meet the 50 foot requirement due to site configuration, • Show location of portable toilets on the drawings Waste Management portable toilets shall be a minimum of 20 feet away from storm drain inlets,conveyance channels or • Have a plan to clean up spills Housekeeping Practices r surface waters and secondary containment shall be provided in case of spills. LIMITATIONS: • The location of the portable toilets shall be accessible to maintenance trucks without damaging • Multiple facilities and/or facilities in several locations erosion and sediment controls or causing erosion or tracking problems. may be needed to adequately serve a construction site ndPIONENrATrON • Sanitary facilities shall be fully enclosed and designed in a manner that minimizes the exposure of • Facilities are subject to vandalism if not within a ''CONSIDERATIONS sanitary waste to precipitation and stormwater runoff. secured construction site When high winds are expected,portable toilets shall be anchored or otherwise secured to prevent •O Capital Costs them from being blown over. MAINTENANCE REQUIREMENTS: Maintenance • Inspect regularly The company that supplies and maintains the portable toilets shall be notified immediately if a toilet is • Check for proper servicing,leaks and spills G Training tipped over or damaged in a way that results in a discharge. Discharged solid matter shall be vacuumed into the septic truck by the company that maintains the toilets. A solution of 10 parts water • Service toilets at the frequency recommended by the O Suitability for Slopes>5% supplier to 1 parts bleach shall be applied to all ground surfaces contaminated by liquids from the toilet. Other Considerations: • The operator of the municipal separate storm sewer system(MS4)shall be notified if a discharge TARGETED POLLUTANTS ' None from the portable toilets enters the MS4 or a natural channel. o Sediment 4.7.4 Design Guidance and Specifications • Nutrients&Toxic Materials No specification for sanitary facilities is currently available in the Standard Specifications for Public Works O Oil&Grease Construction—North Central Texas Council of Governments. o Floatable Materials 4.7.5 Inspection and Maintenance Requirements • Other Construction Wastes Sanitary facilities should be inspected regularly(at least as often as required by the TPDES Construction General Permit)for proper servicing,leaks and spills. Portable toilets shall be regularly serviced at the frequency recommended by the supplier for the number of people using the facility. Sanitary Waste Management CC-202 Sanitary Waste Management CC-203 Revised 04/10 Revised 04/10 iSW Mre Technical Manual Construction Controls iSW MrM Technical Manual Construction Controls 4.8 Spill and Leak Response Procedures 4.8.1 Primary Use Waste Control Spill and leak procedures are used to minimize the impact of accidental releases on surface water. Description:Spill and leak response procedures address the management of spills and leaks that Pollutants that are of concern for spill and leaks include chemicals,hazardous materials,fuel, motor may occur at the construction site. The objective of the spill and leak response procedures is to vehicle fluids,washout waters,and wastes. Spill and leak response is a secondary control. Proper minimize the discharge of pollutants from unplanned releases of chemicals,fuel, motor vehicle procedures for managing these pollutants should be the primary control and are the best way to prevent fluids,hazardous materials or wastes through appropriate recognition and response procedures. the need for spill and leak response. KEY CONSIDERATIONS APWJCAT(ONS DESIGN CRITERIA: 4.8.2 Applications Perimeter Control Spill and leak response procedures are applicable on all construction sites where chemicals,hazardous • Develop procedures based on the Material Safety and materials,fuels,etc.are stored or used. They are most important when the construction site is adjacent Data Sheets for substances onsite Slope Protection y P 1 • Maintain spill kits for petroleum products and other Sediment.Barrier or near to a floodplain,wetland,stream,or other waters. chemicals frequently onsite - • Post emergency contact numbers Channel Protection • Designate a spill response coordinator Temporary 4.8.3 Design Criteria porary Stabilization General • Train employees Final Stabilization • Review reporting requirements for onsite chemicals • An effective spill and leak response depends on proper recognition and response practices by Waste Management construction workers and supervisors. Key elements are education and training. LIMITATIONS: Housekeeping Practices • Procedures susceptible to being forgotten because they Records of releases that exceed the Reportable Quantity for oil and hazardous substances • are seldom or never used should be maintained in accordance with the Federal and State to regulations. regulations. • Larger spills and spills of extremely hazardous materials IMPLEMENTATION • Emergency contact information and spill response procedures shall be posted in a readily available require special equipment and should be handled by CONSIDERATIONS area for access by all employees and subcontractors. professionals • Not applicable to long-term contamination remediation O Capital Costs • Spill containment kits should be maintained for petroleum products and other chemicals that are regularly onsite. Materials in kits should be based on containment guidelines in the Material Safety C Maintenance and Data Sheets(MSDSs)for the substance most frequently onsite. MAINTENANCE REQUIREMENTS: • Review procedures regularly • Training • Spill kits are intended for response to small spills,typically less than 5 gallons,of substances that are • Verify spill kits,MSDSs,and emergency contacts are 0 Suitability for Slopes>'5% not extremely hazardous. readily available • Significant spills or other releases warrant immediate response by trained professionals. • Train new employees and regularly re-train all employees Other Considerations: • Suspected job-site contamination should be immediately reported to regulatory authorities and • OSHA,EPA and TCEQ protective actions taken. regulations TARGETED POLLUTANIS Coordinator O Sediment • The contractor should be required to designate a site superintendent,foreman,safety officer,or other • Nutrients&Toxic Materials senior person who is onsite daily to be the Spill and Leak Response Coordinator. • Oil&Grease • The coordinator must have knowledge of and be trained in correct spill and leak response procedures. O Floatable Materials. • The coordinator shall be responsible for implementing the spill and leak procedures and training all • Other Construction Wastes employees and sub-contractors on the site-specific spill and leak procedures. The training should include their responsibility to immediately notify the coordinator if a spill or leak occurs. Spill Response • Upon discovery of a spill,employees and subcontractors shall implement the following procedures: o Immediately stop work and clear the area by moving upwind of the spill. o Remove all ignition sources. o Notify the Spill and Leak Response Coordinator. o If there is an immediate danger to health or life,contact 911. Spill and Leak Response Procedures CC-204 Spill and Leak Response Procedures CC-205 Revised 04/10 Revised 04/10 iSW Mt"Technical Manual Construction Controls iSW Mm Technical Manual Construction Controls • The Spill and Leak Response Coordinator shall perform the following when the spill is not immediately dangerous to health and safety: 4.9 Subgrade Stabilization Management o Consult the MSDS for safety and response procedures. Material Control Description: Lime and other chemicals are used extensively in the North Central Texas region to o If it can be done safely,use onsite spill kits and soil to contain the spill. stabilize pavement subgrades for roadways, parking lots, and other paved surfaces, and as a o Notify a hazardous response company to remove and properly dispose of the spilled material and subgrade amendment for building pad sites. These chemicals are applied to the soil and mixed the contaminated containment materials. through disking and other techniques, and then allowed to cure. The objective of subgrade stabilization management is to reduce the potential for runoff to carry the chemicals offsite,where Spill Reporting they may impact aquatic life in streams,ponds,and other water bodies. • The Spill and Leak Response Coordinator is responsible for notifying authorities of spills and leaks. Notification requirements are based on Reportable Quantities as established by the type or material, KEY CONSIDERATIONS APPUCATIONS quantity and location(onto land or into water in the state)of the release. DESIGN CRITERIA: • Reportable Quantities (RQ) in the State of Texas are established by the TCEQ in Texas Perimeter Control • Educate employees on proper procedures Administrative Code Title 30,Chapter 327(30 TAC 327)Spill Prevention and Control. Include procedural controls in stabilization Protection • The Texas RQ for petroleum products and used oil is 25 gallons released onto land or any amount specifications Sediment Barrier that causes sheen on water. • Limit stabilization operations to that which can be Channel Protection thoroughly mixed and compacted by the end of each • Reportable Quantities for all other substances are listed in 30 TAC 327.4,which references the EPA workday Temporary Stabilization List of Lists(EPA 550-B-01-003)available at: http://www.eoa.govlceppo/pubs/title3.pdf • Prohibit vehicle traffic, other than water trucks and • The Spill and Leak Response Coordinator shall notify the following: mixing equipment, from passing over the area being Final Stabilization o The municipality that operates the local Municipal Separate Storm Sewer System(MS4) stabilized until mixing is completed Waste Management p p arale S y em( )if a spill • Avoid applications when there is a significant probability or leak enters public rights-of-way or any type of drainage way or drainage infrastructure within of rain that will produce runoff Housekeeping Practices the jurisdiction of the municipality. • Roughen areas adjacent and downstream of stabilized o State of Texas Spill Report Hotline at 1-800-832-8224 if the spill or leak exceeds the RQ;and areas to intercept lime from runoff IMPLE14ENTATION during regular business hours,the TCEQ Dallas/Fort Worth Regional Office at 817-588-5800. • Provide secondary containment according to Section 4.1 CONSIDERATIONS o National Spill Response Center at 1-800-424-8802 if the spill or leak exceeds the RQ. Chemical Management for stabilizers stored onsite LIMITATIONS: O Capital Costs 4.8.4 Design Guidance and Specifications • Prevention of contamination is only effective method Maintenance National guidance for response procedures are established by the Environmental Protection Agency • Does not address spill response when discharge C Training. (EPA)in the Code of Federal Regulations(CFR). Specific sections addressing spills are govemed by: occurs '0 Suitability for Slopes>5% • 40 CFR Part 68 Chemical Accident Prevention Provisions. MAINTENANCE REQUIREMENTS: • 40 CFR Part 302 Designation,Reportable Quantities(RQ)and Notification. • Inspect down slope Other Considerations: g p ( ) p perimeters and outfalls regularly Chemical management during stabilization operations g • 40 CFR Part 355 Emergency Planning and Notification. Immediately halt operations if a discharge is found and Controls for onsite storage Guidance for emergency response procedures in the State of Texas are established by the Texas modify procedures to prevent future discharges of stabilization chemicals Commission on Environmental Quality(TCEQ)in the Texas Administrative Code Title 30,Chapter 327, Spill Prevention and Control. No specification for construction of this item is currently available in the Standard Specifications for Public TARGETED POLLUTANTS Works Construction—North Central Texas Council of Governments. 0 Sediment G Nutrients&Toxic Materials 4.8.5 Inspection and Maintenance Requirements o Oil&Grease Spill and leak response measures should be inspected regularly(at least as often as required by the O Floatable Materials TPDES Construction General Permit). Verify that spill containment materials are available for small spills. Also verify that emergency contact information is posted. These phone numbers and Material Safety and 0 Other Construction Wastes Data Sheets should be in a location that is readily accessible to workers. If procedures are lacking,reinforce requirements by re-training employees. Spill and Leak Response Procedures CC-206 Subgrade Stabilization Management CC-207 Revised 04/10 Revised 04/10 iSW lie Technical Manual Construction Controls iSW Mr"Technical Manual Construction Controls 4.9.5 Inspection and Maintenance Requirements 4.9.1 Primary Use Subgrade stabilization operation should be observed frequently as the operations proceed for evidence of This measure should be implemented when chemicals are required for soil stabilization. Lime is the most discharges. Inspect the down slope perimeter and all outfalls for evidence of discharges. Pay particularly commonly used for stabilization and is considered a chemical. Other agents may also be used for attention to the outfall of drainage pipes connected to inlets within the area being stabilized. If a subgrade stabilization depending on the soil and site conditions. discharge is found,immediately halt stabilization operations until additional controls can be implemented. 4.9.2 Applications 4.9.6 Example Schematic Chemical stabilization can be used under a variety of conditions. The engineer should determine the The following schematic is an example application of the construction control. It is intended to assist in applicability of chemical stabilization based on site conditions such as available open space,quantity of understanding the control's design and function. area to be stabilized,proximity of nearby water courses and other measures employed at the site. The The schematic is not for construction. It may serve as a starting point for creating a construction detail, use of diversion dikes and interceptor swales(see appropriate sections)to divert runoff away from areas but it must be site adapted by the designer. In addition, dimensions and notes appropriate for the to be stabilized can be used in conjunction with these techniques to reduce the potential impact of application must be added by the designer. discharges from chemical stabilization. Management of stabilization chemicals is based on implementing procedures to prevent a discharge. If a discharge occurs,it shall be considered a spill and handled according to the criteria in Section 4.8 Spill and Leak Response Procedures. time Stabilized Surface 4.9.3 Design Criteria Roughen slopes • Construction plan notes or stabilization shall include procedural controls to minimize the discharge of Collect runoff chemical stabilizers. • The contractor shall limit the amount of stabilizing agent onsite to that which can be thoroughly mixed and compacted by the end of each workday. r,a.”' • Stabilizers shall be applied at rates that result in no runoff. Figure 4.2 Schematic of Controls for Subgrade Stabilization • Stabilization shall not occur immediately before and during rainfall events. • No traffic other than water trucks and mixing equipment shall be allowed to pass over the area being stabilized until after completion of mixing the chemical. • Areas adjacent and downstream of stabilized areas shall be roughened to intercept chemical runoff and reduce runoff velocity. • Geotextile fabrics such as those used for silt fence should not be used to treat chemical runoff, because the chemicals are dissolved in the water and won't be affected by a barrier and the suspended solids are significantly smaller than the apparent opening size of the fabric. • For areas in which phasing of chemical staibilization is impractical,a curing seal(such as Liquid Asphalt,Grace MC-250,or MC-800)applied at a rate of 0.15 gallons per square yard of surface can be used to protect the base. • Use of sediment basins with a significant(>36 hour)drawdown time is encouraged to capture any accidental lime or chemical overflows when large areas are being stabilized(Section 3.9 Sediment Basin). • Provide containment around chemical storage,loading and dispensing areas. • If soil stabilizers are stored onsite, they shall be considered hazardous material and shall be managed according to the criteria in Section 4.1 Chemical Management to capture any accidental lime or chemical overflow. 4.9.4 Design Guidance and Specifications No specification for subgrade stabilization management is currently available in the Standard Specifications for Public Works Construction—North Central Texas Council of Governments. Subgrade Stabilization Management CC-208 Subgrade Stabilization Management CC-209 Revised 04/10 Revised 04/10 ISWMr"Technical Manual Construction Controls iSWM''Technical Manual Construction Controls 4.10 Vehicle and Equipment Management 4.10.1 Primary Use Material and Waste Control Vehicle and equipment management is used to minimize the pollutants that enter stormwater from fueling Description: Vehicle and equipment management addresses the practices associated with proper and maintenance activities. use and maintenance of vehicles and equipment at construction sites. The objective is to minimize the discharge of pollutants from vehicle and equipment operation,fueling,maintenance,and washing. 4.10.2 Applications KEY CONSIDERATIONS APPLICATIONS Vehicle and equipment management is applicable on every construction site. The management controls DESIGN CRITERIA: : are most effective when used in conjunction with controls in Section 4.8 Spill and Leak Response Perimeter Control Procedures. • Prohibit the discharge of maintenance fluids and wash water with soap Slope Protection The management techniques are based on proper recognition and handling of pollutant sources related • If feasible,prohibit onsite vehicle washing Sediment Barrier to vehicles and equipment. Key elements are education,established procedures,and provisions for safe • If feasible,prohibit onsite maintenance except fueling storage and disposal of wastes. The following list(not all inclusive)gives examples of the targeted • Provide secondary containment that's 110 percent of Channel Protection materials: the largest container in the containment Temporary Stabilization : • Fuels • Use spill/overflow devices for fueling Final Stabilization • Never leave a fueling operation unattended ▪ Lube Oils • Label all waste containers Waste Management Antifreeze •• Train workers in proper procedures Housekeeping Practices • Solvents LIMITATIONS: • Wash water • Cost of maintenance,repairs,and spill prevention equipment IMPLEMENTATION • One part of a comprehensive construction site waste CONSIDERATIONS 4.10.3 Design Criteria management program • Construction plan notes shall state that the discharge of fuels,oils,or other pollutants used in vehicle • Does not address spill and leak response procedures p Capital Costs and equipment operation and maintenance is prohibited. MAINTENANCE REQUIREMENTS: C Maintenance • Construction plan notes shall state that the discharge of soaps or solvents used in vehicle and • Inspect regularly • Training equipment washing is prohibited. • Check for signs of leaks and spills and take corrective q Suitability for Slopes>5% • On the construction plans,show the location of fuel tanks,motor vehicle fluids storage,and waste actions storage,including secondary containment,or require the contractor to provide this information. • Place drip pans under leaking vehicles and equipment • Provide secondary containment for fuel,new and waste oil,and other maintenance fluids that are when parked i Other Considerat ons: • Verify procedures are being followed None stored onsite. Secondary containment shall have a minimum volume of 110 percent of the largest • Train new employees and regularly re-train all employees container within the containment. • Criteria for the response to spills of motor vehicle fluids are in Section 4.8 Spill and Leak Response Procedures. TARGETED YOLUITANIS • The contractor should be required to designate a site superintendent,foreman,safety officer,or other O Sediment senior person,who is on the site daily,to be responsible for implementing vehicle and equipment management. • Nutrients&Toxic Materials • Oil&Grease Vehicle Washing O Floatable Materials • Minimize the potential for the discharge of pollutants from equipment and vehicle washing by prohibiting these activities onsite,if practical. Vehicles and equipment should be transported to a • Other Construction Wastes commercial vehicle wash facility with appropriate discharge controls. • Designate a wash area if vehicle and equipment washing must be done onsite. Require all washing to be done at this location. The area shall be graded so that all wash water flows to a sediment basin or other sediment control that provides equivalent or better treatment. • Do not use soap for vehicle and equipment washing. Sediment controls will not remove soap from the wash water. Vehicle and Equipment Management CC-210 Vehicle and Equipment Management CC-211 Revised 04/10 Revised 04/10 ISWMr"Technical Manual Construction Controls iSWM'"Technical Manual Construction Controls • Vehicle and equipment wash water may contain oils,greases,and heavy metals. Treatment to 4.10.5 Inspection and Maintenance Requirements remove these pollutants is needed in addition to sediment trapping. Any wash water that has sheen on it must be considered polluted and cannot be discharged from the site without appropriate Vehicle and equipment management controls should be inspected regularly(at least as often as required treatment. State or local discharge permits may be required. by the TPDES Construction General Permit). Verify that washing, fueling, storage, and disposal procedures are being followed. Correct workers where needed. Maintenance Fueling and maintenance fluid storage areas should be checked for signs of leakage or spills. If evidence • If possible,prohibit onsite maintenance except for fueling. Otherwise,limit onsite maintenance to is found,corrective actions should be implemented. Reinforce proper procedures through re-education of routine preventive maintenance. employees.Inspect areas where vehicles and equipment are parked for signs of leaks. Use drip pans where needed. • Maintenance fluids should be stored in appropriate containers(closed drums or similar)and under cover. • The ground under vehicles and equipment parked onsite should be inspected for drips and leaks before each use. Drip pans should be placed under parked vehicles and equipment that leak or drip. • Vehicles and equipment that leak or drip should be removed from the site for repair as soon as possible. • Vehicles and equipment that become inoperative should be removed from the site for repairs. Fueling • Check the municipality's requirements for fuel tanks. Some municipalities have specific requirements for the type of tank and secondary containment. At a minimum,local fire codes apply. • Fuel should be dispensed using a drip pan or other spill/overflow device or within containment berms or other secondary containment. • If the containment control is an earthen pit or berm,the containment shall be lined with plastic. • If an automatic pump is used for fueling,it should be equipped with an overfill protection device. • Workers performing fueling operations shall be trained in the correct procedures for fueling and spill response. • Workers performing fueling operations shall be present and observe the fueling at all times. Fueling shall not be left unattended. • A spill containment kit shall be maintained within 25 feet of the fueling area. Waste Handling and Disposal • Ensure that adequate waste storage volume is available. • All waste containers shall be clearly labeled. • Handling and disposal of waste from vehicle and equipment maintenance should be according to the criteria in Section 4.1 Chemical Management. Education • Instruct workers on procedures for washing,maintaining,and fueling vehicles and equipment. • Instruct workers in identification of pollutants associated with vehicles and equipment. • Have regular meetings to discuss and reinforce procedures(incorporate into regular safety briefings). • Establish a continuing education program to train new employees. 4.10.4 Design Guidance and Specifications No specification for vehicle and equipment management is currently available in the Standard Specifications for Public Works Construction—North Central Texas Council of Governments. Vehicle and Equipment Management CC-212 Vehicle and Equipment Management CC-213 Revised 04/10 Revised 04/10 Appendix L TPDES General Permit Number TXR 150000 For Construction Activities This Appendix contains a copy of the TPDES 2013 General Permit for Construction Activities. You may use this copy for reference if needed if you have any questions about the TXR150000. Construction General Permit TPDES General Permit TXR150000 Texas Commission on Environmental Uah} > TPDES GENERAL PERMIT NUMBER TXR150000 RELATING TO Q `J STORMWATER DISCHARGES ASSOCIATED WITH CONSTRUCTION P.O.Box 13087,Austin,Texas 78711-3087 ACTIVITIES PE-0.� W,. �`- , Table of Contents • - Part I. Flow Chart and Definitions 5 GENERAL PERMIT TO DISCHARGE UNDER THE Section A. Flow Chart to Determine Whether Coverage is Required 5 Section B. Definitions 6 TEXAS POLLUTANT DISCHARGE ELIMINATION SYSTEM Part II. Permit Applicability and Coverage 12 under provisions of Section A. Discharges Eligible for Authorization 12 Section 402 of the Clean Water Act and Chapter 26 of the Texas Water Code 1. Stormwater Associated with Construction Activity 12 2. Discharges of Stormwater Associated with Construction Support Activities 12 This permit supersedes and replaces TPDES General Permit No.TXR150000,issued March 5,2008 3. Non-Stormwater Discharges 12 4. Other Permitted Discharges 13 Construction sites that discharge stormwater associated with construction activity Section B. Concrete Truck Wash Out 13 located in the state of Texas Section C. Limitations on Permit Coverage 13 may discharge to surface water in the state, 1. Post Construction Discharges 13 only according to monitoring requirements and other conditions set forth in this general 2. Prohibition of Non-Stormwater Discharges 1 permit,as well as the rules of the Texas Commission on Environmental Quality(TCEQ or 3 Commission),the laws of the State of Texas,and other orders of the Commission of the 3 Compliance With Water Quality Standards 13 TCEQ.The issuance of this general permit does not grant to the permittee the right to use 4. Impaired Receiving Waters and Total Maximum Daily Load(TMDL) private or public property for conveyance of stormwater and certain non-stormwater discharges along the discharge route.This includes property belonging to but not limited to Requirements 14 any individual,partnership,corporation or other entity. Neither does this general permit 5. Discharges to the Edwards Aquifer Recharge or Contributing Zone 14 authorize any invasion of personal rights nor any violation of federal,state,or local laws or regulations. It is the responsibility of the permittee to acquire property rights as maybe 6. Discharges to Specific Watersheds and Water Quality Areas 14 necessary to use the discharge route. 7. Protection of Streams and Watersheds by Other Governmental Entities 14 This general permit and the authorization contained herein shall expire at midnight,five 8. Indian Country Lands 14 years from the permit effective date. 9. Oil and Gas Production 15 EFFECTIVE DATE: March 5,2013 - 1o. Stormwater Discharges from Agricultural Activities 15 ISSUED DATE: FEB 1 9 2013 �, 11. Endangered Species Act 15 '/}�� 12. Other 15 For C nmission _-^r Section D. Deadlines for Obtaining Authorization to Discharge 15 1. Large Construction Activities �5 2. Small Construction Activities �5 Section E. Obtaining Authorization to Discharge 16 1. Automatic Authorization for Small Construction Activities With Low Potential for Erosion 16 2. Automatic Authorization For All Other Small Construction Activities. 17 3. Authorization for Large Construction Activities: 17 Page 2 Construction General Permit TPDES General Permit TXR15o00o Construction General Permit TPDES General Permit TXR150000 4. Waivers for Small Construction Activities* 18 Part V. Concrete Truck Wash Out Requirements 40 5. Effective Date of Coverage 18 Part VI. Retention of Records 40 6. Notice of Change(NOC) 18 Part VII.Standard Permit Conditions 40 7. Signatory Requirement for NOI Forms,Notice of Termination(NOT)Forms,NOC Part VIII. Fees 41 Letters,and Construction Site Notices r9 Appendix A: Automatic Authorization 43 8. Contents of the NOI r9 Appendix B:Erosivity Index(EI)Zones in Texas 45 Section F. Terminating Coverage 20 Appendix C: Isoerodent Map 46 1. Notice of Termination(NOT)Required 20 Appendix D: Erosivity Indices for EI Zones in Texas 47 2. Minimum Contents of the NOT 20 3. Termination of Coverage for Small Construction Sites and for Secondary Operators at Large Construction Sites 20 4. Transfer of Operational Control 21 Section G. Waivers from Coverage 21 1. Waiver Applicability and Coverage 22 2. Steps to Obtaining a Waiver 22 3. Effective Date of Waiver 22 4. Activities Extending Beyond the Waiver Period 22 Section II. Alternative TPDES Permit Coverage 23 r. Individual Permit Alternative 23 2. Individual Permit Required 23 3. Alternative Discharge Authorization 23 Section I. Permit Expiration 23 Part III.Stormwater Pollution Prevention Plans(SWP3) 24 Section A. Shared SWP3 Development 24 Section B. Responsibilities of Operators 25 r. Secondary Operators and Primary Operators with Control Over Construction Plans and Specifications 25 2. Primary Operators with Day-to-Day Operational Control 25 Section C. Deadlines for SWP3 Preparation,Implementation,and Compliance 25 Section D. Plan Review and Making Plans Available 26 Section E. Revisions and Updates to SWP3s 26 Section F. Contents of SWP3 26 Section G. Erosion and Sediment Control Requirements Applicable to All Sites 34 Part IV. Stormwater Runoff from Concrete Batch Plants 35 Section A. Benchmark Sampling Requirements 35 Section B. Best Management Practices(BMPs)and SWP3 Requirements 37 Section C. Prohibition of Wastewater Discharges 39 Page 3 Page 4 Construction General Permit TPDES General Permit TXRi50000 Construction General Permit TPDES General Permit TXRl50000 Section B. Definitions Part I. Flow Chart and Definitions Arid Areas-Areas with an average annual rainfall of o to to inches. Section A. Flow Chart to Determine Whether Coverage is Required Best Management Practices(BMPs)-Schedules of activities,prohibitions of practices, maintenance procedures,structural controls,local ordinances,and other management How much land will be disturbed?(•1) practices to prevent or reduce the discharge of pollutants. BMPs also include treatment requirements,operating procedures,and practices to control construction site runoff,spills or leaks,waste disposal,or drainage from raw material storage areas. 4 Commencement of Construction-The initial disturbance of soils associated with clearing,grading,or excavation activities,as well as other construction-related activities < I or more acres (e.g.,stockpiling of fill material,demolition). ('I) Common Plan of Development-A construction activity that is completed in separate stages,separate phases,or in combination with other construction activities.A common plan of development(also known as a"common plan of development or sale")is identified by the documentation for the construction project that identifies the scope of the project,and vo Do you meet the rhs will 5 or may include plats,blueprints,marketing plans,contracts,building permits,a public notice • definition of be disturbed^ or hearing,zoning requests,or other similar documentation and activities.A common plan "operators"(•2) res (•I l of development does not necessarily include all construction projects within the jurisdiction of a public entity(e.g.,a city or university).Construction of roads or buildings in different parts of the jurisdiction would be considered separate"common plans,"with only the interconnected parts of a project being considered part of a"common plan"(e.g.,a building No YES and its associated parking lot and driveways,airport runway and associated taxiways,a l building complex,etc.).Where discrete construction projects occur within a larger common Permit Coverage Reouired plan of development or sale but are located 1/4 mile or more apart,and the area between the • Prepare and Implement swr3 projects is not being disturbed,each individual project can be treated as a separate plan of • Post Site Notice development or sale,provided that any interconnecting road,pipeline or utility project that • Submit Copy of Site Notice to is part of the same"common plan"is not included in the area to be disturbed. MS4 Operator Construction Activity-Includes soil disturbance activities,including clearing,grading, f Are you a"primary and excavating;and does not include routine maintenance that is performed to maintain the vo operator?"(•21 original line and grade,hydraulic capacity,or original purpose of the site(e.g.,the routine - grading of existing dirt roads,asphalt overlays of existing roads,the routine clearing of existing ri g t-of-wa gh ys,and similar maintenance activities).Regulated construction activity is Permit Coverage Not FES defined in terms of small and large construction activity. • Reouirnf.thdess Part Permit Cotierage Required ` Dewatering—The act of draining rainwater or groundwater from building foundations, of a Larger Common • Prepare and Implement Sw'Pi vaults,and trenches. Plan of or Sale Development Submit NO!to Tcr.(j Discharge—For the purposes of this permit,the drainage,release,or disposal of pollutants •or Sale g p p p • Post Site Notice in stormwater and certain non-stormwater from areas where soil disturbing activities(e.g., Submit Copy of NO!to MS4 clearing,grading,excavation,stockpiling of fill material,and demolition),construction materials or equipment storage or maintenance(e.g.,fill piles,borrow area,concrete truck wash out,fueling),or other industrial stormwater directly related to the construction process ("1) To determine the size of the construction project,use the size of the entire area to he disturbed,and (e.g.,concrete or asphalt batch plants)are located. include the.size of the larger common plan of development or sale,if the project is part of a larger project(refer to Part tit,"Defrnidons,"for an explanation of"common plan of development or sole). Drought-Stricken Area-For the purposes of this permit,an area in which the National ("2) Refer to the definitions for"operator,"primary,operator,"and"secondary operator"in Part i., Oceanic and Atmospheric Administration's U.S.Seasonal Drought Outlook indicates for the Section R.of this permit. period during which the construction will occur that any of the following conditions are likely:(1)"Drought to persist or intensify",(2)"Drought ongoing,some improvement",(3) "Drought likely to improve,impacts ease",or(4)"Drought development likely/".See http://www.cpc.nceu,noaa.gov/products/expert assessment/seasonal drought html Edwards Aquifer-As defined under Texas Administrative Code(TAC)§213.3 of this title (relating to the Edwards Aquifer),that portion of an arcuate belt of porous,water-bearing, predominantly carbonate rocks known as the Edwards and Associated Limestones in the Balcones Fault Zone trending from west to east to northeast in Kinney,Uvalde,Medina, Bexar,Comal,Hays,Travis,and Williamson Counties;and composed of the Salmon Peak Page 5 Page 6 Construction General Permit TPDES General Permit TXR150000 Construction General Permit TPDES General Permit TXR150000 Limestone,McKnight Formation,West Nueces Formation,Devil's River Limestone,Person Fullfillment of this requirement must be documented in the homebuilder's Formation,Kainer Formation,Edwards Formation,and Georgetown Formation.The stormwater pollution prevention plan(SWP3). permeable aquifer units generally overlie the less-permeable Glen Rose Formation to the south,overlie the less-permeable Comanche Peak and Walnut Formations north of the C. For construction activities on land used for agricultural purposes(such as pipelines Colorado River,and underlie the less-permeable Del Rio Clay regionally. across crop or range land),final stabilization may be accomplished by returning the Edwards Aquifer Recharge Zone-Generally,that area where the stratigraphic units disturbed land to its preconstruction agricultural use.Areas disturbed that were not constituting the Edwards Aquifer crop out,including the outcrops of other geologic previously used for agricultural activities,such as buffer strips immediately adjacent to formations in proximity to the Edwards Aquifer,where caves,sinkholes,faults,fractures,or surface water and areas that are not being returned to their preconstruction agricultural other permeable features would create a potential for recharge of surface waters into the use must meet the final stabilization conditions of condition(a)above. Edwards Aquifer.The recharge zone is identified as that area designated as such on official D. In arid,semi-arid,and drought-stricken areas only,all soil disturbing activities at the site maps located in the offices of the Texas Commission on Environmental Quality(TCEQ)and have been completed and both of the following criteria have been met: the appropriate regional office.The Edwards Aquifer Map Viewer,located at httu://www.tceq.texas.gov/compliance/field ops/eann/mapdisclaimer.html,can be used to (1)Temporary erosion control measures(for example,degradable rolled erosion control determine where the recharge zone is located. product)are selected,designed,and installed along with an appropriate seed base to Edwards Aquifer Contributing Zone-The area or watershed where runoff from provide erosion control for at least three years without active maintenance by the precipitation flows downgradient to the recharge zone of the Edwards Aquifer.The operator,and contributing zone is located upstream(upgradient)and generally north and northwest of the (2)The temporary erosion control measures are selected,designed,and installed to recharge zone for the following counties:all areas within Kinney County,except the area achieve 70%of the native background vegetative coverage within three years. within the watershed draining to Segment No.2304 of the Rio Grande Basin;all areas within Uvalde,Medina,Bexar,and Comal Counties;all areas within Hays and Travis Counties, Hypercldornlation of Waterlines—Treatment of potable water lines or tanks with except the area within the watersheds draining to the Colorado River above a point 1.3 miles chlorine for disinfection purposes,typically following repair or partial replacement of the upstream from Tom Miller Dam,Lake Austin at the confluence of Barrow Brook Cove, waterline or tank,and subsequently flushing the contents. Segment No.1403 of the Colorado River Basin;and all areas within Williamson County, Impaired Water-A surface water body that is identified on the latest approved CWA except the area within the watersheds draining to the Lampasas River above the dam at §303(d)List as not meeting applicable state water quality standards.Impaired waters Stillhouse Hollow reservoir,Segment No.1216 of the Brazos River Basin.The contributing include waters with approved or established total maximum daily loads(TMDLs),and those zone is illustrated on the Edwards Aquifer map viewer at where a TM DL has been proposed by TCEQ but has not yet been approved or established. http://www.tceq.texas.gov/compliance/field ops/eanp/mapdisclaimer.litml. Effluent Limitations Guideline(EEG)—Defined in 4o Code of Federal Regulations Indian Country Land—(from 4o CFR§122.2)(1)all land within the limits of any Indian (CFR)§ Effluent Limitations it a ions Guideline cline(ELG) by the Administrator n dn o under§304(b)Regulations the ionsn reservation under the jurisdiction of the United States government,notwithstanding the (CFR)§Act 2.2 as to adopt or published s effluent t limitations. issuance of any patent,and,including rights-of-way running through the reservation;(2)all dependent Indian communities with the borders of the United States whether within the Facility or Activity—For the purpose of this permit,a construction site or construction originally or subsequently acquired territory thereof,and whether within or without the support activity that is regulated under this general permit,including all contiguous land and limits of a state;and(3)all Indian allotments,the Indian titles to which have not been fixtures(for example,ponds and materials stockpiles),structures,or appurtances used at a extinguished,including rights-of-way running through the same. construction site or industrial site described by this general permit. Indian Tribe-(from 4o CFR§122.2)any Indian Tribe,band,group,or community Final Stabilization-A construction site status where any of the following conditions are recognized by the Secretary of the Interior and exercising governmental authority over a met: Federal Indian Reservation. A. All soil disturbing activities at the site have been completed and a uniform(that is,evenly Large Construction Activity-Construction activities including clearing,grading,and distributed,without large bare areas)perennial vegetative cover with a density of at least excavating that ion activity in land disturbance n s the e equal disturbance or greater than five(5)acres of land. 70%of the native background vegetative cover for the area has been established on all land era that is activity rge includes tpe niofdevelop of less than five the(5)acres o total unpaved areas and areas not covered by plan area that a part is a larger equal l to plan ohanv five(5)acres es or of if the larger common p y permanent structures,or equivalent permanent plan will ultimately disturb e dal to or greater than five stabilization measures(such as the use of riprap,gabions,or geotextiles)have been p Y 4 g (5)meds of la in. Large original line employed. activity does not include routine maintenance that is performed to maintain the original line and grade,hydraulic capacity,or original purpose of the site(for example,the routine B. For individual lots in a residential construction site by either: grading of existing dirt roads,asphalt overlays of existing roads,the routine clearing of existing right-of-ways,and similar maintenance activities.) (1)the homebuilder completing final stabilization as specified in condition(a)above;or Linear Project—Includes the construction of roads,bridges,conduits,substructures, (2)the homebuilder establishing temporary stabilization for an individual lot prior to pipelines,sewer lines,towers,poles,cables,wires,connectors,switching,regulating and the time of transfer of the ownership of the home to the buyer and after informing the transforming equipment and associated ancillary facilities in a long,narrow area. homeowner of the need for,and benefits of,final stabilization.If temporary Minimize-To reduce or eliminate to the extent achievable using stormwater controls that stabilization is not feasible,then the homebuilder may fulfill this requirement by are technologically available and economically practicable and achievable in light of best retaining perimeter controls or BMPs,and informing the homeowner of the need for industry practices. removal of temporary controls and the establishment of final stabilization. Page 7 Page 8 Construction General Permit TPDES General Permit TXR150000 Construction General Permit TPDES General Permit TXR1500o0 Municipal Separate Storm Sewer System(MS4)-A separate storm sewer system Point Source—(from 4o CFR§122.2)Any discernible,confined,and discrete conveyance, owned or operated by the United States,a state,city,town,county,district,association,or including but not limited to,any pipe,ditch,channel,tunnel,conduit,well,discrete fissure, other public body(created by or pursuant to state law)having jurisdiction over the disposal container,rolling stock concentrated animal feeding operation,landfill leachate collection of sewage,industrial wastes,stormwater,or other wastes,including special districts under system,vessel or other floating craft from which pollutants are,or may be,discharged. This state law such as a sewer district,flood control or drainage district,or similar entity,or an term does not include return flows from irrigated agriculture or agricultural stormwater Indian tribe or an authorized Indian tribal organization,that discharges to surface water in runoff. the state. Pollutant-Dredged spoil,solid waste,incinerator residue,sewage,garbage,sewage sludge, Notice of Change(NOC)—Written notification to the executive director from a filter backwash,munitions,chemical wastes,biological materials,radioactive materials,heat, discharger authorized under this permit,providing changes to information that was wrecked or discarded equipment,rock,sand,cellar dirt,and industrial,municipal,and previously provided to the agency in a notice of intent form. agricultural waste discharged into any surface water in the state.The term"pollutant"does Notice of Intent(NOI)-A written submission to the executive director from an applicant not include tail water or runoff water from irrigation or rainwater runoff from cultivated or requesting coverage under this general permit. uncultivated rangeland,pastureland,and farmland. For the purpose of this permit,the term "pollutant"includes sediment. Notice of Termination(NOT)-A written submission to the executive director from a Pollution-(from Texas Water Code(TWC)§26.001(14))The alteration of the physical, discharger authorized under a general permit requesting termination of coverage. thermal,chemical,or biological quality of,or the contamination of,any surface water in the Operator-The person or persons associated with a large or small construction activity that state that renders the water harmful,detrimental,or injurious to humans,animal life, is either a primary or secondary operator as defined below: vegetation,or property or to public health,safety,or welfare,or impairs the usefulness or the Primary Operator—the person or persons associated with a large or small public enjoyment of the water for any lawful or reasonable purpose. construction activity that meets either of the following two criteria: Rainfall Erosivity Factor(R factor)-the total annual erosive potential that is due to (a)the person or persons have on-site operational control over construction plans and climatic effects,and is part of the Revised Universal Soil Loss Equation(RUBLE). specifications,including the ability to make modifications to those plans and Receiving Water-A"Water of the United States"as defined in 4o CFR§122.2 into which specifications;or the regulated stormwater discharges. (b)the person or persons have day-to-day operational control of those activities at a Semiarid Areas-areas with an average annual rainfall of 10 to 20 inches construction site that are necessary to ensure compliance with a Storm Water Separate Storm Sewer System-A conveyance or system of conveyances(including Pollution Prevention Plan(SWP3)for the site or other permit conditions(for roads with drainage systems,streets,catch basins,curbs,gutters,ditches,man-made example,they are authorized to direct workers at a site to carry out activities channels,or storm drains),designed or used for collecting or conveying stormwater;that is required by the SWP3 or comply with other permit conditions). not a combined sewer,and that is not part of a publicly owned treatment works(POTW). Secondary Operator—The person or entity,often the property owner,whose Small Construction Activity Construction activities including clearing,grading, operational control is limited to: excavating that result in land disturbance of equal to or greater than one(I)acre and less (a)the employment of other operators,such as a general contractor,to perform or than five(5)acres of land.Small construction activity also includes the disturbance of less supervise construction activities;or than one(1)acre of total land area that is part of a larger common plan of development or (b)the ability to approve or disapprove changes to construction plans and specifications, sale if the larger common plan will ultimately disturb equal to or greater than one(1)and but who does not have day-to-day on-site operational control over construction less than five(5)acres of land.Small construction activity does not include routine activities the site. maintenance that is performed to maintain the original line and grade,hydraulic capacity,or original purpose of the site(for example,the routine grading of existing dirt roads,asphalt Secondary operators must either prepare their own SWP3 or participate in a shared overlays of existing roads,the routine clearing of existing right-of-ways,and similar SWP3 that covers the areas of the construction site where they have control over the maintenance activities.) plans and specifications. Steep Slopes—Where a state,Tribe,local government,or industry technical manual(e.g. If there is not a primary operator at the construction site,then the secondary operator is stormwater IIMP manual)has defined what is to be considered a"steep slope",this permit's defined as the primary operator and must comply with the requirements for primary definition automatically adopts that definition.Where no such definition exists,steep slopes operators. are automatically defined as those that are 1 y 15 percent or greater in grade. Outfall-For the purpose of this permit,a point source at the point where stormwater runoff Stormwater(or Stormwater Runoff)-Rainfall runoff,snow melt runoff,and surface associated with construction activity discharges to surface water in the state and does not runoff and drainage. include open conveyances connecting two municipal separate storm sewers,or pipes, tunnels,or other conveyances that connect segments of the same stream or other water of Stormwater Associated with Construction Activity-stormwater runoff from a the U.S.and are used to convey waters of the U.S. construction activity where soil disturbing activities(including clearing,grading,excavating) result in the disturbance of one(1)or more acres of total land area,or are part of a larger Permittee-An operator authorized under this general permit.The authorization maybe common plan of development or sale that will result in disturbance of one(1)or more acres gained through submission of a notice of intent,by waiver,or by meeting the requirements of total land area. for automatic coverage to discharge stormwater runoff and certain non-stormwater Structural Control(or Practice)-A pollution prevention practice that requires the discharges. construction of a device,or the use of a device,to reduce or prevent pollution in stormwater Page 9 Page 10 Construction General Permit TPDES General Permit TXR150000 Construction General Permit TPDES General Permit TXR15oo00 runoff. Structural controls and practices may include but are not limited to:silt fences, disposal area in wetlands)nor resulted from the impoundment of waters of the U.S.Waters earthen dikes,drainage swales,sediment traps,check dams,subsurface drains,storm drain of the U.S.do not include prior converted cropland. Notwithstanding the determination of inlet protection,rock outlet protection,reinforced soil retaining systems,gabions,and an area's status as prior converted cropland by any other federal agency,for the purposes of temporary or permanent sediment basins. the CWA,the final authority regarding CWA jurisdiction remains with EPA. Surface Water in the State- Lakes,bays,ponds,impounding reservoirs,springs,rivers, Part II. Permit Applicability and Coverage streams,creeks,estuaries,wetlands,marshes,inlets,canals,the Gulf of Mexico inside the territorial limits of the state(from the mean high water mark(MIIWM)out 10.36 miles into Section A. Discharges Eligible for Authorization the Gulf),and all other bodies of surface water,natural or artificial,inland or coastal,fresh or salt,navigable or nonnavigable,and including the beds and banks of all water-courses and 1. Stormwater Associated with Construction Activity bodies of surface water,that are wholly or partially inside or bordering the state or subject to the jurisdiction of the state;except that waters in treatment systems which are authorized by Discharges of stormwater runoff from small and large construction activities may be state or federal law,regulation,or permit,and which are created for the purpose of waste authorized under this general permit. treatment are not considered to be water in the state. Temporary Stabilization-A condition where exposed soils or disturbed areas are 2. Discharges of Stormwater Associated with Construction Support Activities provided a protective cover or other structural control to prevent the migration of pollutants. Examples of construction support activities include,but are not limited to,concrete Temporary stabilization may include temporary seeding,geotextiles,mulches,and other batch plants,rock crushers,asphalt batch plants,equipment staging areas,material techniques to reduce or eliminate erosion until either permanent stabilization can be storage yards,material borrow areas,and excavated material disposal areas. achieved or until further construction activities take place. Construction support activities authorized under this general permit are not commercial Total Maximum Daily Load(TMDL)-The total amount of a pollutant that a water body operations,and do not serve multiple unrelated construction projects. Discharges of can assimilate and still meet the Texas Surface Water Quality Standards. stormwater runoff from construction support activities may be authorized under this general permit,provided that the following conditions are met: Turbidity—A condition of water quality characterized by the presence of suspended solids and/or organic material. (a)the activities are located within one(1)mile from the boundary of the permitted construction site and directly support the construction activity; Waters of the United States-(from 4o CFR§122.2)Waters of the United States or waters of the U.S.means: (b)an SWP3 is developed for the permitted construction site according to the provisions (a)all waters which are currently used,were used in the past,or may be susceptible to of this general permit,and includes appropriate controls and measures to reduce Y P Y P erosion and discharge of pollutants in stormwater runoff from the construction use in interstate or foreign commerce,including all waters which are subject to the support activities;and ebb and flow of the tide; (c)the construction support activities either do not operate beyond the completion date (b)all interstate waters,including interstate wetlands; of the construction activity or,at the time that they do,are authorized under separate (c)all other waters such as intrastate lakes,rivers,streams(including intermittent Texas Pollutant Discharge Elimination System(TPDES)authorization. Separate streams),mudflats,sandflats,wetlands,sloughs,prairie potholes,wet meadows, TPDES authorization may include the'PPDES Multi Sector General Permit(MSGP), playa lakes,or natural ponds that the use,degradation,or destruction of which would TXRo50000(related to stormwater discharges associated with industrial activity), affect or could affect interstate or foreign commerce including any such waters: separate authorization under this general permit if applicable,coverage under an alternative general permit if available,or authorization under an individual water (1)which are or could be used by interstate or foreign travelers for recreational or quality permit. other purposes; (2)from which fish or shellfish are or could be taken and sold in interstate or foreign 3. Non-Stormwater Discharges commerce;or The following non-stormwater discharges from sites authorized under this general (3)which are used or could be used for industrial purposes by industries in interstate permit are also eligible for authorization under this general permit: commerce; (a)discharges from fire fighting activities(fire fighting activities do not include washing (d)all impoundments of waters otherwise defined as waters of the United States under of trucks,run-off water from training activities,test water from fire suppression this definition; systems,or similar activities); (e)tributaries of waters identified in paragraphs(a)through(d)of this definition; (b)uncontaminated fire hydrant flushings(excluding discharges of hyperchlorinated (f) the territorial sea;and water,unless the water is first dechlorinated and discharges are not expected to adversely affect aquatic life),which include flushings from systems that utilize (g)wetlands adjacent to waters(other than waters that are themselves wetlands) potable water,surface water,or groundwater that does not contain additional identified in paragraphs(a)through(f)of this definition. pollutants(uncontaminated fire hydrant flushings do not include systems utilizing Waste treatment systems,including treatment ponds or lagoons designed to meet the reclaimed wastewater as a source water); requirements of CWA(other than cooling ponds as defined in 4o CFR§423.11(m)which also (c)water from the routine external washing of vehicles,the external portion of buildings meet the criteria of this definition)are not waters of the U.S.This exclusion applies only to or structures,and pavement,where detergents and soaps are not used,where spills manmade bodies of water which neither were originally created in waters of the U.S.(such as or leaks of toxic or hazardous materials have not occurred(unless spilled materials Page 11 Page 12 Construction General Permit TPDES General Permit TXR150000 Construction General Permit TPDES General Permit TXR150000 have been removed;and if local state,or federal regulations are applicable,the 4. Impaired Receiving Waters and Total Maximum Daily Load(TMDL)Requirements materials are removed according to those regulations),and where the purpose is to remove mud,dirt,or dust; New sources or new discharges of the pollutants of concern to impaired waters are not authorized by this permit unless otherwise allowable under 3o TAC Chapter 305 and (d)uncontaminated water used to control dust; applicable state law. Impaired waters are those that do not meet applicable water (e)potable water sources,including waterline flushings,but excluding discharges of quality standards and are listed on the EPA approved CWA§303(d)List.Pollutants of hyperchlorinated water,unless the water is first dechlorinated and discharges are not concern are those for which the water body is listed as impaired. expected to adversely affect aquatic life; Discharges of the pollutants of concern to impaired water bodies for which there is a (f) uncontaminated air conditioning condensate; TMDL are not eligible for this general permit unless they are consistent with the approved TMDL. Permittees must incorporate the conditions and requirements (g)uncontaminated ground water or spring water,including foundation or footing applicable to their discharges into their SWP3,in order to be eligible for coverage under drains where flows are not contaminated with industrial materials such as solvents; this general permit. For consistency with the construction stormwater-related items in and an approved TMDL,the SWP3 must be consistent with any applicable condition,goal,or (h)lawn watering and similar irrigation drainage. requirement in the TMDL,TMDL Implementation Plan(I-Plan),or as otherwise directed by the executive director. 4. Other Permitted Discharges 5. Discharges to the Edwards Aquifer Recharge or Contributing Zone Any discharge authorized under a separate National Pollutant Discharge Elimination System(NPDES),TPDES,or TCEQ permit may be combined with discharges authorized Discharges cannot be authorized by this general permit where prohibited by 3o TAC by this general permit,provided those discharges comply with the associated permit. Chapter 213(relating to Edwards Aquifer). In addition,commencement of construction (i.e.,the initial disturbance of soils associated with clearing,grading,or excavating Section A. Concrete Truck Wash Out activities,as well as other construction-related activities such as stockpiling of fill material and demolition)at a site regulated under 3o TAC Chapter 213,may not begin The wash out of concrete trucks at regulated construction sites must be performed in until the appropriate Edwards Aquifer Protection Plan(EAPP)has been approved by the accordance with the requirements of Part V of this general permit. TCEQ's Edwards Aquifer Protection Program. Section C. Limitations on Permit Coverage (a)For new discharges located within the Edwards Aquifer Recharge Zone,or within that area upstream from the recharge zone and defined as the Contributing Zone 1. Post Construction Discharges (CZ),operators must meet all applicable requirements of,and operate according to, Discharges that occur after construction activities have been completed,and after the 3o TAC Chapter 213(Edwards Aquifer Rule)in addition to the provisions and construction site and any supporting activity site have undergone final stabilization,are requirements of this general permit. not eligible for coverage under this general permit. Discharges originating from the sites (b)For existing discharges located within the Edwards Aquifer Recharge Zone,the are not authorized under this general permit following the submission of the notice of requirements of the agency-approved Water Pollution Abatement Plan(WPAP) termination(NOT)or removal of the appropriate site notice,as applicable,for the under the Edwards Aquifer Rule is in addition to the requirements of this general regulated construction activity. permit. BMPs and maintenance schedules for structural stormwater controls,for example,may be required as a provision of the rule.All applicable requirements of 2. Prohibition of Non-Stormwater Discharges the Edwards Aquifer Rule for reductions of suspended solids in stormwater runoff Except as otherwise provided in Part ILA.of this general permit,only discharges that are are in addition to the requirements in this general permit for this pollutant. composed entirely of stormwater associated with construction activity may be 6. Discharges to Specific Watersheds and Water Quality Areas authorized under this general permit. Discharges otherwise eligible for coverage cannot be authorized by this general permit 3. Compliance With Water Quality Standards where prohibited by 3o TAC Chapter 311(relating to Watershed Protection)for water Discharges to surface water in the state that would cause,have the reasonable potential quality areas and watersheds. to cause,or contribute to a violation of water quality standards or that would fail to 7. Protection of Streams and Watersheds by Other Governmental Entities protect and maintain existing designated uses are not eligible for coverage under this general permit.The executive director may require an application for an individual This general permit does not limit the authority or ability of federal,other state,or local permit or alternative general permit(see Parts II.H.2.and 3.)to authorize discharges to governmental entities from placing additional or more stringent requirements on surface water in the state if the executive director determines that any activity will cause, construction activities or discharges from construction activities. For example,this has the reasonable potential to cause,or contribute to a violation of water quality permit does not limit the authority of a home-rule municipality provided by Texas Local standards or is found to cause,has the reasonable potential to cause,or contribute to, Government Code§401.002. the impairment of a designated use.The executive director may also require an 8. Indian Count Lands application for an individual permit considering factors described in Part II.H.2.of this n' general permit. Stormwater runoff from construction activities occurring on Indian Country lands are not under the authority of the TCEQ and are not eligible for coverage under this general permit. If discharges of stormwater require authorization under federal NPDES Page 13 Page 14 Construction General Permit TPDES General Permit TXRl50000 Construction General Permit TPDES General Permit TXR150000 regulations,authority for these discharges must be obtained from the U.S. under this general permit or a separate TPDES permit,prior to the commencement of Environmental Protection Agency(EPA). those construction activities. 9. Oil and Gas Production (b)Ongoing Construction-Discharges from ongoing small construction activities that commenced prior to the effective date of this general permit,and that would not meet Stormwater runoff from construction activities associated with the exploration, the conditions to qualify for termination of this permit as described in Part II.E.of development,or production of oil or gas or geothermal resources,including this general permit,must meet the requirements to be authorized,either under this transportation of crude oil or natural gas by pipeline,are not under the authority of the general permit or a separate TPDES permit,within 90 days of the effective date of TCEQ and are not eligible for coverage under this general permit. If discharges of this general permit.During this interim period,as a requirement of this TPDES stormwater require authorization under federal NPDES regulations,authority for these permit,the operator must continue to meet the conditions and requirements of the discharges must be obtained from the EPA. previous TPDES permit. to.Stormwater Discharges from Agricultural Activities Section E. Obtaining Authorization to Discharge Stormwater discharges from agricultural activities that are not point source discharges 1. Automatic Authorization for Small Construction Activities With Low Potential for of stormwater are not subject to TPDES permit requirements.These activities may F.rosion: include clearing and cultivating ground for crops,construction of fences to contain livestock,construction of stock ponds,and other similar agricultural activities. If all of the following conditions are met,then a small construction activity is determined Discharges of stormwater runoff associated with the construction of facilities that are to occur during periods of low potential for erosion,and a site operator may be subject to TPDES regulations,such as the construction of concentrated animal feeding automatically authorized under this general permit without being required to develop an operations,would be point sources regulated under this general permit. SWP3 or submit an NOI: it. Endangered Species Act (a)the construction activity occurs in a county listed in Appendix A; Discharges that would adversely affect a listed endangered or threatened aquatic or (b)the construction activity is initiated and completed,including either final or aquatic-dependent species or its critical habitat are not authorized by this permit,unless temporary stabilization of all disturbed areas,within the time frame identified in the requirements of the Endangered Species Act are satisfied.Federal requirements Appendix A for the location of the construction site; related to endangered species apply to all TPDES permitted discharges and site-specific (c)all temporary stabilization is adequately maintained to effectively reduce or prohibit controls may be required to ensure that protection of endangered or threatened species erosion,permanent stabilization activities have been initiated,and a condition of is achieved. If a permittee has concerns over potential impacts to listed species,the final stabilization is completed no later than 3o days following the end date of the permittee may contact TCEQ for additional information. time frame identified in Appendix A for the location of the construction site; 12.Other (d)the permittee signs a completed TCEQ construction site notice,including the Nothing in Part II of the general permit is intended to negate any person's ability to certification statement; assert the force majeure(act of God,war,strike,riot,or other catastrophe)defenses (e)a signed copy of the construction site notice is posted at the construction site in a found in 3o TAC§70.7. location where it is readily available for viewing by the general public,local,state,and federal authorities prior to commencing construction activities,and maintained in Section D. Deadlines for Obtaining Authorization to Discharge that location until completion of the construction activity; Large Construction Activities (f) a copy of the signed and certified construction site notice is provided to the operator 1. of any MS4 receiving the discharge at least two days prior to commencement of (a)New Construction-Discharges from sites where the commencement of construction construction activities; occurs on or after the effective date of this general permit must be authorized,either (g)any supporting concrete batch plant or asphalt batch plant is separately authorized under this general permit or a separate TPDES permit,prior to the commencement of for discharges of stormwater runoff or other non-stormwater discharges under an those construction activities. individual TPDES permit,another TPDES general permit,or under an individual (b)Ongoing Construction-Operators of large construction activities continuing to TCEQ permit where stormwater and non-stormwater is disposed of by evaporation or operate after the effective date of this permit,and authorized under TPDES general irrigation(discharges are adjacent to water in the state);and permit TXR1500oo(effective on March 5,2008),must submit an NOI to renew (h)any non-stormwater discharges are either authorized under a separate permit or authorization or a NOT to terminate coverage under this general permit within 90 authorization,or are not considered to be a wastewater. days of the effective date of this general permit. During this interim period,as a requirement of this TPDES permit,the operator must continue to meet the Part II.G.of this general permit describes how an operator may apply for and obtain a conditions and requirements of the previous TPDES permit. waiver from permitting,for certain small construction activities that occur during a period with a low potential for erosion,where automatic authorization under this section 2. Small Construction Activities is not available. (a)New Construction-Discharges from sites where the commencement of construction occurs on or after the effective date of this general permit must be authorized,either Page 15 Page 16 Construction General Permit TPDES General Permit TXR15oo0o Construction General Permit TPDES General Permit TXRl50000 2. Automatic Authorization For All Other Small Construction Activities: (d)prior to commencing construction activities,all primary operators must(1)provide a Operators of small construction activities not described in Part II.E.i.above may be copy of the signed NOI to the operator of any MS4 receiving the discharge and to any automatically authorized under this general permit,and operators of these sites shall not secondary construction operator,and(2)list in the SWP3 the names and addresses of be required to submit an NOI,provided that they meet all of the following conditions: all MS4 operators receiving a copy; (a)develop a SWP3 according to the provisions of this general permit,that covers either (e)all persons meeting the definition of"secondary operator"in Part I of this permit are the entire site or all portions of the site for which the applicant is the operator,and required notified submit that they are regulated t under primary ryoper permit,but site has implement that plan prior to commencing construction activities; sequin d submit ors required iredto submit that a an one rhos c the site has submitted an NOI,or is required to submit an NOI,and the secondary operator has (b)sign and certify a completed TCEQ small construction site notice,post the notice at provided notification to the operator(s)of the need to obtain coverage(with records the construction site in a location where it is safely and readily available for viewing of notification available upon request).Any secondary operator notified under this by the general public,local,state,and federal authorities,prior to commencing provision may alternatively submit an NOI under this general permit,may seek construction,and maintain the notice in that location until completion of the coverage under an alternative TPDES individual permit,or may seek coverage under construction activity(for linear construction activities,e.g.pipeline or highway,the an alternative TPDES general permit if available;and site notice must be placed in a publicly accessible location near where construction is (f) all secondary operators must provide a copy of the signed and certified Secondary actively underway;notice for these linear sites may be relocated,as necessary,along Operator construction site notice to the operator of any MS4 receiving the discharge the length of the project,and the notice must be safely and readily available for prior to commencement of construction activities. viewing by the general public;local,state,and federal authorities);and (c)provide a copy of the signed and certified construction site notice to the operator of 4 Waivers for Small Construction Activities: any municipal separate storm sewer system receiving the discharge prior to Part II.G.describes how operators of certain small construction activities may obtain a commencement of construction activities. waiver from coverage. Operators of small construction activities as defined in Part I.B of this general permit shall not submit an NOI for coverage unless otherwise required by the executive director. 5 Effective Date of Coverage As described in Part I(Definitions)of this general permit,large construction activities (a)Operators of small construction activities as described in either Part II.E.t.or II.E.2. include those that will disturb less than five(5)acres of land,but that are part of a larger above are authorized immediately following compliance with the applicable common plan of development or sale that will ultimately disturb five(5)or more acres of conditions of Part ILE.1.or II.E.2. Secondary operators of large construction land,and must meet the requirements of Part II.E.3.below. activities as described in Part II.E.3.above are authorized immediately following compliance with the applicable conditions in Part II.E.3. For activities located in 3. Authorization for Large Construction Activities: areas regulated by 3o TAC Chapter 213,related to the Edwards Aquifer,this authorization to discharge is separate from the requirements of the operator's Operators of large construction activities that qualify for coverage under this general responsibilities under that rule. Construction may not commence for sites regulated permit must meet all of the following conditions: under 3o TAC Chapter 213 until all applicable requirements of that rule are met. (a)develop a SWP3 according to the provisions of this general permit that covers either (b)Primary operators of large construction activities as described in Part II.E.3.above the entire site or all portions of the site for which the applicant is the operator,and are provisionally authorized seven(7)days from the date that a completed NOI is implement that plan prior to commencing construction activities; postmarked for delivery to the TCEQ,unless otherwise notified by the executive (b)primary operators must submit an NOI,using a form provided by the executive director. If electronic submission of the NOI is provided,and unless otherwise director,at least seven(7)days prior to commencing construction activities,or if notified by the executive director,primary operators are authorized immediately utilizing electronic submittal,prior to commencing construction activities. If an following confirmation of receipt of the NOI by the TCEQ. Authorization is non- additional primary operator is added after the initial NOI is submitted,the new provisional when the executive director finds the NOI is administratively complete primary operator must submit an NOI at least seven(7)days before assuming and an authorization number is issued for the activity. For activities located in areas operational control,or if utilizing electronic NOI submittal,prior to assuming regulated by 30 TAC Chapter 213,related to the Edwards Aquifer,this authorization operational control.If the primary operator changes after the initial NOI is to discharge is separate from the requirements of the operator's responsibilities submitted,the new primary operator must submit a paper NOI or an electronic NOI under that rule.Construction may not commence for sites regulated under 3o TAC at least ten(10)days before assuming operational control; Chapter 213 until all applicable requirements of that rule are met. (c)all operators of large construction activities must post a site notice in accordance with (c)Operators are not prohibited from submitting late NOIs or posting late notices to Part III.D.2.of this permit.The site notice must be located where it is safely and obtain authorization under this general permit.The TCEQ reserves the right to take readily available for viewing by the general public,local,state,and federal authorities appropriate enforcement actions for any unpermitted activities that may have prior to commencing construction,and must be maintained in that location until occurred between the time construction commenced and authorization was obtained. completion of the construction activity(for linear construction activities,e.g.pipeline or highway,the site notice must be placed in a publicly accessible location near where 6. Notice of Change(NOC) construction is actively underway;notice for these linear sites maybe relocated,as If relevant information provided in the NOI changes,an NOC must be submitted at least necessary,along the length of the project,and the notice must be safely and readily 14 days before the change occurs,if possible.Where 14-day advance notice is not available for viewing by the general public;local,state,and federal authorities); possible,the operator must submit an NOC within 14 days of discovery of the change. If Page 17 Page 18 Construction General Permit TPDES General Permit TXRi50000 Construction General Permit TPDES General Permit TXRi50000 the operator becomes aware that it failed to submit any relevant facts or submitted Section F. Terminating Coverage incorrect information in an NOI,the correct information must be provided to the executive director in an NOC within 14 days after discovery. The NOC shall be 1. Notice of Termination(NOT)Required submitted on a form provided by the executive director,or by letter if an NOC form is Each operator that has submitted an NOI for authorization under this general permit not available.A copy of the NOC must also be provided to the operator of any MS4 receiving the discharge,and a list must be included in the SWP3 that includes the names must apply to terminate that authorization following the conditions described in this and addresses of all MS4 operators receiving a copy. section of the general permit.Authorization must be terminated by submitting an NOT on a form supplied by the executive director.Authorization to discharge under this Information that may be included on an NOC includes,but is not limited to,the general permit terminates at midnight on the day the NOT is postmarked for delivery to following: the description of the construction project,an increase in the number of acres the TCEQ. If electronic submission of the NOT is provided,authorization to discharge disturbed(for increases of one or more acres),or the operator name.A transfer of under this permit terminates immediately following confirmation of receipt of the NOT operational control from one operator to another,including a transfer of the ownership by the TCEQ. Compliance with the conditions and requirements of this permit is of a company,may not be included in an NOC. required until an NOT is submitted. A transfer of ownership of a company includes changes to the structure of a company, The NOT must be submitted to TCEQ,and a copy of the NOT provided to the operator of such as changing from a partnership to a corporation or changing corporation types,so any MS4 receiving the discharge(with a list in the SWP3 of the names and addresses of that the filing number(or charter number)that is on record with the Texas Secretary of all MS4 operators receiving a copy),within 3o days after any of the following conditions State must be changed. are met: An NOC is not required for notifying TCEQ of a decrease in the number of acres (a)final stabilization has been achieved on all portions of the site that are the disturbed.This information must be included in the SWP3 and retained on site. responsibility of the permittee; 7. Signatory Requirement for NOI Forms,Notice of Termination(NOT)Forms,NOC (b)a transfer of operational control has occurred(See Section II.F.4.below);or Letters,and Construction Site Notices (c)the operator has obtained alternative authorization under an individual TPDES NOI forms,NOT forms,NOC letters,and Construction Site Notices that require a permit or alternative TPDES general permit. signature must be signed according to 3o TAC§305.44(relating to Signatories for 2. Minimum Contents of the NOT Applications). The NOT form shall require,at a minimum,the following information: 8. Contents of the NOI (a)if authorization was granted following submission of an NOI,the permittee's site- The NOI form shall require,at a minimum,the following information: specific TPDES authorization number for the construction site; (a)the TPDES CGP authorization number for existing authorizations under this general (b)an indication of whether the construction activity is completed or if the permittee is permit,where the operator submits an NOI to renew coverage within 90 days of the simply no longer an operator at the site; effective date of this general permit; (c)the name,address,and telephone number of the permittee submitting the NOT; (b)the name,address,and telephone number of the operator filing the NOI for permit coverage; (d)the name(or other identifier),address,county,and location(latitude/longitude)of the construction project or site;and (c)the name(or other identifier),address,county,and latitude/longitude of the construction project or site; (e)a signed certification that either all stormwater discharges requiring authorization under this general permit will no longer occur,or that the applicant is no longer the (d)the number of acres that will be disturbed by the applicant; operator of the facility or construction site,and that all temporary structural erosion (e)confirmation that the project or site will not be located on Indian Country lands; controls have either been removed,will be removed on a schedule defined in the SWP3,or have been transferred to a new operator if the new operator has applied for (f) confirmation that a SWP3 has been developed in accordance with this general permit, permit coverage. Erosion controls that are designed to remain in place for an that it will be implemented prior to construction,and that it is compliant with any indefinite period,such as mulches and fiber mats,are not required to be removed or applicable local sediment and erosion control plans;for multiple operators who scheduled for removal. prepare a shared SWP3,the confirmation for an operator may be limited to its obligations under the SWP3 provided all obligations are confirmed by at least one 3. Termination of Coverage for Small Construction Sites and for Secondary Operators operator; at Large Construction Sites (g)name of the receiving water(s); Each operator that has obtained automatic authorization and has not been required to (h)the classified segment number for each classified segment that receives discharges submit an NOI must remove the site notice upon meeting any of the conditions listed from the regulated construction activity(if the discharge is not directly to a classified below,complete the applicable portion of the site notice related to removal of the site segment,then the classified segment number of the first classified segment that those notice,and submit a copy of the completed site notice to the operator of any MS4 discharges reach);and receiving the discharge(or provide alternative notification as allowed by the MS4 (i) the name of all surface waters receiving discharges from the regulated construction operator,with documentation of such notification included in the SWP3),within 3o days activity that are on the latest EPA-approved CWA§3o3(d)List of impaired waters. of meeting any of the following conditions: Page 19 Page 20 Construction General Permit TPDES General Permit TXR150000 Construction General Permit TPDES General Permit TXRl50000 (a)final stabilization has been achieved on all portions of the site that are the 1. Waiver Applicability and Coverage responsibility of the permittee; Operators of small construction activities may apply for and receive a waiver from the (b)a transfer of operational control has occurred(See Section II.F.4.below);or requirements to obtain authorization under this general permit,where all of the (c)the operator has obtained alternative authorization under an individual or general following conditions are met.This waiver from coverage does not apply to non- TPDES permit. stormwater discharges.The operator must insure that any non-stormwater discharges are either authorized under a separate permit or authorization,or are not considered to Authorization to discharge under this general permit terminates immediately upon be a wastewater. removal of the applicable site notice. Compliance with the conditions and requirements of this permit is required until the site notice is removed. (a)the calculated rainfall erosivity(R)factor for the entire period of the construction project is less than five(5); 4. Transfer of Operational Control (b)the operator submits to the TCEQ a signed waiver certification form,supplied by the Coverage under this general permit is not transferable.A transfer of operational control executive director,certifying that the construction activity will commence and be includes changes to the structure of a company,such as changing from a partnership to a completed within a period when the value of the calculated R factor is less than five corporation,or changing to a different corporation type such that a different filing(or (5);and charter)number is established with the Texas Secretary of State. (c)the waiver certification form is postmarked for delivery to the TCEQ at least seven(7) When the primary operator of a large construction activity changes or operational days before construction activity begins or,if electronic filing is available,then any control is transferred,the original operator must submit an NOT within ten(lo)days time following the receipt of written confirmation from TCEQ that a complete prior to the date that responsibility for operations terminates,and the new operator electronic application was submitted and acknowledged. must submit an NOI at least ten(to)days prior to the transfer of operational control,in 2. Steps to Obtaining a Waiver accordance with condition(a)or(b)below.A copy of the NOT must be provided to the operator of any MS4 receiving the discharge in accordance with Section ILF.1.above. The construction site operator may calculate the R factor to request a waiver using the Operators of regulated construction activities who are not required to submit an NOI following steps: must remove the original site notice,and the new operator must post the required site (a)Estimate the construction start date and the construction end date.The construction notice prior to the transfer of operational control,in accordance with condition(a)or(b) end date is the date that final stabilization will be achieved. below.A copy of the completed site notice must be provided to the operator of any MS4 receiving the discharge,in accordance with Section II.F.3.above. (b)Find the appropriate Erosivity Index(EI)zone in Appendix B of this permit. A transfer of operational control occurs when either of the following criteria is met: (c)Find the EI percentage for the project period by adding the results for each period of operator has assumed control over all areas of the site that have not been the project using the table provided in Appendix D of this permit,in EPA Fact Sheet (a)Another o P 2.1,or in USDA Handbook 703,by subtracting the start value from the end value to finally stabilized;and all silt fences and other temporary erosion controls have either find the percent EI for the site. been removed,scheduled for removal as defined in the SWP3,or transferred to a new operator,provided that the permitted operator has attempted to notify the new (d)Refer to the Isoerodent Map(Appendix C of this permit)and interpolate the annual operator in writing of the requirement to obtain permit coverage. Record of this isoerodent value for the proposed construction location. notification(or attempt at notification)shall be retained by the operator in (e)Multiply the percent value obtained in Step(c)above by the annual isoerodent value accordance with Part VI of this permit. Erosion controls that are designed to remain obtained in Step(d).This is the R factor for the proposed project. If the value is less in place for an indefinite period,such as mulches and fiber mats,are not required to than 5,then a waiver maybe obtained. If the value is five(5)or more,then a waiver be removed or scheduled for removal. may not be obtained,and the operator must obtain coverage under Part II.E.2.of this (b)A homebuilder has purchased one or more lots from an operator who obtained permit. coverage under this general permit for a common plan of development or sale.The Alternatively,the operator may calculate a site-specific R factor utilizing the following homebuilder is considered a new operator and shall comply with the requirements online calculator: http://ei.tamu.edu/index.html,or using another available resource. listed above,including the development of a SWP3 if necessary. Under these The waiver certification form is not required to be posted at the small construction site. circumstances,the homebuilder is only responsible for compliance with the general permit requirements as they apply to lot(s)it has operational control over,and the 3. Effective Date of Waiver original operator remains responsible for common controls or discharges,and must amend its SWP3 to remove the lot(s)transferred to the homebuilder. Operators of small construction activities are provisionally waived from the otherwise applicable requirements of this general permit seven(7)days from the date that a Section G. Waivers from Coverage completed waiver certification form is postmarked for delivery to TCEQ,or immediately The executive director may waive the otherwise applicable requirements of this general upon receiving confirmation of approval of an electronic submittal,if electronic form permit for stormwater discharges from small construction activities under the terms and submittals are available. conditions described in this section. 4. Activities Extending Beyond the Waiver Period If a construction activity extends beyond the approved waiver period due to circumstances beyond the control of the operator,the operator must either: Page 21 Page 22 Construction General Permit TPDES General Permit TXR150000 Construction General Permit TPDES General Permit TXR150000 (a)recalculate the R factor using the original start date and a new projected ending date, Public Notice,Public Meetings,and Public Comment),the commission may amend, and if the R factor is still under five(5),submit a new waiver certification form at revoke,cancel,or renew this general permit. least two(2)days before the end of the original waiver period;or 2. If the executive director publishes a notice of the intent to renew or amend this (b)obtain authorization under this general permit according to the requirements general permit before the expiration date,the permit will remain in effect for delineated in either Part II.E.2.or Part II.E.3.before the end of the approved waiver existing,authorized discharges until the commission takes final action on the permit. period. Upon issuance of a renewed or amended permit,permittees may be required to submit an NOI within 90 days following the effective date of the renewed or amended Section H. Alternative TPDES Permit Coverage permit,unless that permit provides for an alternative method for obtaining authorization. 1. Individual Permit Alternative 3. If the commission does not propose to reissue this general permit within 90 days Any discharge eligible for coverage under this general permit may alternatively be before the expiration date,permittees shall apply for authorization under an authorized under an individual TPDES permit according to 3o TAC§305(relating to individual permit or an alternative general permit. If the application for an Consolidated Permits).Applications for individual permit coverage should be submitted individual permit is submitted before the expiration date,authorization under this at least three hundred and thirty(330)days prior to commencement of construction expiring general permit remains in effect until the issuance or denial of an individual activities to ensure timely authorization. permit. No new NOIs will be accepted nor new authorizations honored under the 2. Individual Permit Required general permit after the expiration date. The executive director may suspend an authorization or deny an NOI in accordance with Part Ill. Stormwater Pollution Prevention Plans(SWP3) the procedures set forth in 30 TAC§205(relating to General Permits for Waste Discharges),including the requirement that the executive director provide written notice All regulated construction site operators shall prepare an SWP3,prior to submittal of an to the permittee.The executive director may require an operator of a construction site, NOI,to address discharges authorized under Parts II.E.2.and II.E.3.of this general permit otherwise eligible for authorization under this general permit,to apply for an individual that will reach Waters of the U.S.,including discharges to MS4s and privately owned TPDES permit in the following circumstances: separate storm sewer systems that drain to Waters of the U.S.,to identify and address potential sources of pollution that are reasonably expected to affect the quality of discharges (a)the conditions of an approved TMDL or TMDL I-Plan on the receiving water; from the construction site,including off-site material storage areas,overburden and (b)the activity being determined to cause a violation of water quality standards or being stockpiles of dirt,borrow areas,equipment staging areas,vehicle repair areas,fueling areas, found to cause,or contribute to,the loss of a designated use of surface water in the etc.,used solely by the permitted project.The SWP3 must describe the implementation of state:and practices that will be used to minimize to the extent practicable the discharge of pollutants in (c)any other consideration defined in 3o TAC Chapter 205(relating to General Permits stormwater associated with construction activity and non-stormwater discharges described in Part II.A.3.,in compliance with the terms and conditions of this permit. for Waste Discharges)including 3o TAC Chapter 2o5.4(c)(3)(D),which allows the commission to deny authorization under the general permit and require an individual Individual operators at a site may develop separate SWP3s that cover only their portion of permit if a discharger"has been determined by the executive director to have been the project,provided reference is made to the other operators at the site.Where there is out of compliance with any rule,order,or permit of the commission,including non- more than one SWP3 for a site,permittees must coordinate to ensure that BM Ps and payment of fees assessed by the executive director." controls are consistent and do not negate or impair the effectiveness of each other. Additionally,the executive director may cancel,revoke,or suspend authorization to Regardless of whether a single comprehensive SWP3 is developed or separate SWP3s are discharge under this general permit based on a finding of historical and significant developed for each operator,it is the responsibility of each operator to ensure compliance noncompliance with the provisions of this general permit,relating to 3o TAC§60.3(Use with the terms and conditions of this general permit in the areas of the construction site of Compliance History). Denial of authorization to discharge under this general permit where that operator has control over construction plans and specifications or day-to-day or suspension of a permittee's authorization under this general permit shall be done operations. according to commission rules in 3o TAC Chapter 205(relating to General Permits for Section A. Shared SWY Development Waste Discharges). 3 P 3. Alternative Discharge Authorization For more effective coordination of BM Ps and opportunities for cost sharing,a cooperative effort by the different operators at a site is encouraged. Operators must Any discharge eligible for authorization under this general permit may alternatively be independently obtain authorization,but may work together to prepare and implement a authorized under a separate general permit according to 3o TAC Chapter 205(relating single,comprehensive SWP3 for the entire construction site. to General Permits for Waste Discharges),if applicable. 1. The SWP3 must clearly list the name and,for large construction activities,the general Section I. Permit Expiration permit authorization numbers,for each operator that participates in the shared SWP3. Until the TCEQ responds to receipt of the NOI with a general permit 1. This general permit is effective for a term not to exceed five(5)years.All active authorization number,the SWP3 must specify the date that the NOI was submitted to discharge authorizations expire on the date provided on page one(r)of this permit. TCEQ by each operator. Each operator participating in the shared plan must also Following public notice and comment,as provided by 3o TAC§205.3(relating to sign the SWP3. Page 23 Page 24 Construction General Permit TPDES General Permit TXR150000 Construction General Permit TPDES General Permit TXR150000 2. The SWP3 must clearly indicate which operator is responsible for satisfying each disturbance.The SWP3 must be prepared so that it provides for compliance with the shared requirement of the SWP3. If the responsibility for satisfying a requirement is terms and conditions of this general permit. not described in the plan,then each permittee is entirely responsible for meeting the requirement within the boundaries of the construction site where they perform Section D. Plan Review and Making Plans Available construction activities.The SWP3 must clearly describe responsibilities for meeting 1. The SWP3 must be retained on-site at the construction site or,if the site is inactive or each requirement in shared or common areas. does not have an on-site location to store the plan,a notice must be posted describing 3. The SWP3 may provide that one operator is responsible for preparation of a SWP3 in the location of the SWP3.The SWP3 must be made readily available at the time of an compliance with the CGP,and another operator is responsible for implementation of on-site inspection to: the executive director;a federal,state,or local agency the SWP3 at the project site. approving sediment and erosion plans,grading plans,or stormwater management plans;local government officials;and the operator of a municipal separate storm Section B. Responsibilities of Operators sewer receiving discharges from the site. If the SWP3 is retained off-site,then it shall be made available as soon as reasonably possible. In most instances,it is reasonable 1. Secondary Operators and Primary Operators with Control Over Construction Plans that the SWP3 shall be made available within 24 hours of the request. and Specifications 2. A primary operator of a large construction activity must post the TCEQ site notice All secondary operators and primary operators with control over construction plans near the main entrance of the construction site.An operator of a small construction and specifications shall: activity seeking authorization under this general permit and a secondary operator of a large construction activity must post the TCEQ site notice required in Part II.E.r., (a)ensure the project specifications allow or provide that adequate BMPs are 2.,or 3.of this general permit in order to obtain authorization. If the construction developed to meet the requirements of Part III of this general permit; project is a linear constriction project,such as a pipeline or highway,the notices must be placed in a publicly accessible location near where construction is actively (b)ensure that the SWP3 indicates the areas of the project where they have control underway. Notices for these linear sites maybe relocated,as necessary,along the over project specifications,including the ability to make modifications in specifications; length of the project.The notices must be readily available for viewing by the general public;local,state,and federal authorities;and contain the following information: (c)ensure that all other operators affected by modifications in project specifications (a)the site-specific TPDES authorization number for the project if assigned; are notified in a timely manner so that those operators may modify their BMP s as necessary to remain compliant with the conditions of this general permit;and (b)the operator name,contact name,and contact phone number; (d)ensure that the SWP3 for portions of the project where they are operators (c)a brief description of the project;and indicates the name and site-specific TPDES authorization number(s)for (d)the location of the SWP3. operators with the day-to-day operational control over those activities necessary to ensure compliance with the SWP3 and other permit conditions. If the party 3. This permit does not provide the general public with any right to trespass on a with day-to-day operational control has not been authorized or has abandoned construction site for any reason,including inspection of a site;nor does this permit the site,the person with control over project specifications is considered to be the require that permittees allow members of the general public access to a construction responsible party until the authority is transferred to another party and the SWP3 site. is updated. Section E. Revisions and Updates to SWP3s 2. Primary Operators with Day-to-Day Operational Control The permittee must revise or update the SWP3 whenever the following occurs: Primary operators with day-to-day operational control of those activities at a project that r. a change in design,construction,operation,or maintenance that has a significant are necessary to ensure compliance with an SWP3 and other permit conditions must effect on the discharge of pollutants and that has not been previously addressed in ensure that the SWP3 accomplishes the following requirements: the SWP3; (a)meets the requirements of this general permit for those portions of the project where 2. changing site conditions based on updated plans and specifications,new operators, they are operators; new areas of responsibility,and changes in BMPs;or (b)identifies the parties responsible for implementation of BMPs described in the SWP3; 3. results of inspections or investigations by site operators,operators of a municipal (c)indicates areas of the project where they have operational control over day-to-day separate storm sewer system receiving the discharge,authorized TCEQ personnel,or activities;and a federal,state or local agency approving sediment and erosion plans indicate the (d)includes,for areas where they have operational control over day-to-day activities,the SWP3 is proving ineffective in eliminating or significantly minimizing pollutants in name and site-specific TPDES authorization number of the parties with control over discharges authorized under this general permit. project specifications,including the ability to make modifications in specifications. Section P. Contents of SWP3 Section C. Deadlines for SWP3 Preparation,Implementation,and Compliance The SWP3 must include,at a minimum,the information described in this section and must comply with the construction and development effluent guidelines in Part III, The SWP3 must be prepared prior to obtaining authorization under this general permit, Section G of the general permit. and implemented prior to commencing construction activities that result in soil Page 25 Page 26 Construction General Permit TPDES General Permit TXR15o00o Construction General Permit TPDES General Permit TXRl50000 1. A site or project description,which includes the following information: (m)locations of all pollutant-generating activities,such as paving operations; (a)a description of the nature of the construction activity; concrete,paint and stucco washout and water disposal;solid waste storage and disposal;and dewatering operations. (b)a list of potential pollutants and their sources; 2. A description of the BMPs that will be used to minimize pollution in runoff. (c)a description of the intended schedule or sequence of activities that will disturb The description must identify the general timing or sequence for implementation.At soils for major portions of the site,including estimated start dates and duration of a minimum,the description must include the following components: activities; (d)the total number of acres of the entire property and the total number of acres (a)General Requirements where construction activities will occur,including off-site material storage areas, (i) Erosion and sediment controls must be designed to retain sediment on-site overburden and stockpiles of dirt,and borrow areas that are authorized under the to the extent practicable with consideration for local topography,soil type, permittee's NOI; and rainfall. (e)data describing the soil or the quality of any discharge from the site; (ii) Control measures must be properly selected,installed,and maintained (I) a map showing the general location of the site(e.g.a portion of a city or county according to the manufacturer's or designer's specifications. map); (iii) Controls must be developed to minimize the offsite transport of litter, (g)a detailed site map(or maps)indicating the following: construction debris,and construction materials. (i) drainage patterns and approximate slopes anticipated after major grading (b)Erosion Control and Stabilization Practices activities; The SWP3 must include a description of temporary and permanent erosion control (ii) areas where soil disturbance will occur; and stabilization practices for the site,compliant with the requirements of Part III.G.].and G.2 of this general permit,including a schedule of when the practices will (iii) locations of all controls and buffers,either planned or in place; be implemented.Site plans should ensure that existing vegetation is preserved where (iv) locations where temporary or permanent stabilization practices are it is possible. expected to be used; (i) Erosion control and stabilization practices may include but are not limited (v) locations of construction support activities,including off-site activities, to:establishment of temporary or permanent vegetation,mulching, that are authorized under the permittee's NOI,including material,waste, geotextiles,sod stabilization,vegetative buffer strips,protection of existing borrow,fill,or equipment or chemical storage areas; trees and vegetation,slope texturing,temporary velocity dissipation devices,flow diversion mechanisms,and other similar measures. (vi) surface waters(including wetlands)either at,adjacent,or in close proximity to the site,and also indicating those that are impaired waters; (ii) The following records must be maintained and either attached to or referenced in the SWP3,and made readily available upon request to the (vii) locations where stormwater discharges from the site directly to a surface parties listed in Part III.D.r of this general permit: water body or a municipal separate storm sewer system; (A) the dates when major grading activities occur; (viii) vehicle wash areas;and (B) the dates when construction activities temporarily or permanently (ix) designated points on the site where vehicles will exit onto paved roads(for cease on a portion of the site;and instance,this applies to construction transition from unstable dirt areas to (C) the dates when stabilization measures are initiated. exterior paved roads). Where the amount of information required to be included on the map would result (iii) Erosion control and stabilization measures must be initiated immediately in a single map being difficult to read and interpret,the operator shall develop a in portions of the site where construction activities have temporarily series of maps that collectively include the required information. ceased and will not resume for a period exceeding 14 calendar days. Stabilization measures that provide a protective cover must be initiated (h)the location and description of support activities authorized under the permittee's immediately in portions of the site where construction activities have NOI,including asphalt plants,concrete plants,and other activities providing permanently ceased.The term"immediately"is used to define the support to the construction site that is authorized under this general permit; deadline for initiating stabilization measures.In the context of this (i) the name of receiving waters at or near the site that maybe disturbed or that may requirement,"immediately"means as soon as practicable,but no later than receive discharges from disturbed areas of the project; the end of the next work day,following the day when the earth-disturbing activities have temporarily or permanently ceased. Except as provided in (j) a copy of this TPDES general permit; (A)through(D)below,these measures must be completed as soon as (k)the NOI and acknowledgement certificate for primary operators of large practicable,but no more than 14 calendar days after the initiation of soil construction sites,and the site notice for small construction sites and for stabilization measures: secondary operators of large construction sites; (A) Where the immediate initiation of stabilization measures after (1) stormwater and allowable non-stormwater discharge locations,including storm construction activity temporarily or permanently ceased is precluded drain inlets on site and in the immediate vicinity of the construction site;and Page 27 Page 28 Construction General Permit TPDES General Permit TXRl50000 Construction General Permit TPDES General Permit TXRl50000 by snow cover or frozen ground conditions,stabilization measures (2)Where rainfall data is not available or a calculation cannot be must be initiated as soon as practicable. performed,the sedimentation basin must provide at least 3,600 (B) In arid areas,semi-arid areas,or drought-stricken areas where the cubic feet of storage per acre drained until final stabilization of the immediate initiation of stabilization measures after construction site. activity has temporarily or permanently ceased or is precluded by arid (3)If a sedimentation basin is not feasible,then the permittee shall conditions,erosion control and stabilization measures must be provide equivalent control measures until final stabilization of the initiated as soon as practicable.Where vegetative controls are not site. In determining whether installing a sediment basin is feasible due to arid conditions,the operator shall immediately install, feasible,the permittee may consider factors such as site soils, and within 14 calendar days of a temporary or permanent cessation of slope,available area,public safety,precipitation patterns,site work in any portion of the site complete,non-vegetative erosion geometry,site vegetation,infiltration capacity,geotechnical controls. If non-vegetative controls are not feasible,the operator shall factors,depth to groundwater,and other similar considerations. install temporary sediment controls as required in Paragraph(C) The permittee shall document the reason that the sediment basins below. are not feasible,and shall utilize equivalent control measures, (C) In areas where temporary stabilization measures are infeasible,the which may include a series of smaller sediment basins. operator may alternatively utilize temporary perimeter controls.The (4)Unless infeasible,when discharging from sedimentation basins operator must document in the SWP3 the reason why stabilization and impoundments,the permittee shall utilize outlet structures measures are not feasible,and must demonstrate that the perimeter that withdraw water from the surface. controls will retain sediment on site to the extent practicable.The (B) Perimeter Controls:At a minimum,silt fences,vegetative buffer operator must continue to inspect the BMP5 at the frequency strips,or equivalent sediment controls are required for all down slope established in Section IILP.y.(a)for unstabilized sites. boundaries of the construction area,and for those side slope (D) If the initiation or completion of vegetative stabilization is affected by boundaries deemed appropriate as dictated by individual site circumstances beyond the control of the permittee,vegetative conditions. stabilization must be initiated or completed as soon as conditions or circumstances allow it on the site.The requirement to initiate (ii) Controls for Sites With Drainage Areas Less than Ten Acres: stabilization is triggered as soon as it is known with reasonable (A) Sediment traps and sediment basins may be used to control solids in certainty that work will be stopped for 14 or more additional calendar stormwater runoff for drainage locations serving less than ten(to) days. acres.At a minimum,silt fences,vegetative buffer strips,or (iv) Final stabilization must be achieved prior to termination of permit equivalent sediment controls are required for all down slope coverage. boundaries of the construction area,and for those side slope boundaries deemed appropriate as dictated by individual site (v) TCEQ does not expect that temporary or permanent stabilization measures conditions. to be applied to areas that are intended to be left un-vegetated or un- stabilized following construction(e.g.,dirt access roads,utility pole pads, (B) Alternatively,a sediment basin that provides storage for a calculated areas being used for storage of vehicles,equipment,or materials). volume of runoff from a 2-year,24-hour storm from each disturbed acre drained may be utilized. Where rainfall data is not available or a (c) Sediment Control Practices calculation cannot be performed,a temporary or permanent sediment The SWP3 must include a description of any sediment control practices used to basin providing 3,600 cubic feet of storage per acre drained may be remove eroded soils from stormwater runoff,including the general timing or provided. If a calculation is performed,then the calculation shall be sequence for implementation of controls. included in the SWP3. (i) Sites With Drainage Areas of Ten or More Acres (C) If sedimentation basins or impoundments are used,the permittee shall comply with the requirements in Part III.G.6 of this general (A) Sedimentation Basin(s) permit. (r)A sedimentation basin is required,where feasible,for a common 3. Description of Permanent Stormwater Controls drainage location that serves an area with ten(10)or more acres A description of any measures that will be installed during the construction process disturbed at one time.A sedimentation basin may be temporary or to control pollutants in stormwater discharges that may occur after construction permanent,and must provide sufficient storage to contain a operations have been completed must be included in the SWP3. Permittees are only calculated volume of nunoff from a 2-year,24-hour storm from responsible for the installation and maintenance of stormwater management each disturbed acre drained.When calculating the volume of measures prior to final stabilization of the site or prior to submission of an NOT. runoff from a 2-year,24-hour storm event,it is not required to include the flows from offsite areas and flow from onsite areas that 4. Other Required Controls and BMPs are either undisturbed or have already undergone permanent stabilization,if these flows are diverted around both the disturbed of sediments (a) Permittees shall minimize,to the extent practicable,the off-site vehicle tracking areas of the site and the sediment basin.Capacity calculations shall of sed and the generation of dust.The SWP3 shall include a description be included in the SWP3. of controls utilized to accomplish this requirement. Page 29 Page 30 Construction General Permit TPDES General Permit TXR150000 Construction General Permit TPDES General Permit TXR1500o0 (b) The SWP3 must include a description of construction and waste materials controls such as silt fences,berms,etc.,the trapped sediment must be removed expected to be stored on-site and a description of controls to minimize pollutants before it reaches 5o%of the above-ground height. from these materials. (d) If sediment escapes the site,accumulations must be removed at a frequency that (c) The SWP3 must include a description of potential pollutant sources from areas minimizes off-site impacts,and prior to the next rain event,if feasible. If the other than construction(such as stormwater discharges from dedicated asphalt permittee does not own or operate the off-site conveyance,then the permittee plants and dedicated concrete batch plants),and a description of controls and shall work with the owner or operator of the property to remove the sediment. measures that will be implemented at those sites to minimize pollutant 7. Inspections of Controls discharges. (d) Permittees shall place velocity dissipation devices at discharge locations and (a) Personnel provided by the permittee must inspect disturbed areas of the along the length of any outfall channel(i.e.,runoff conveyance)to provide a non- construction site that have not been finally stabilized,areas used for storage of erosive flow velocity from the structure to a water course,so that the natural materials that are exposed to precipitation,discharge locations,and structural physical and biological characteristics and functions are maintained and controls for evidence of,or the potential for,pollutants entering the drainage protected. system. Personnel conducting these inspections must be knowledgeable of this general permit,familiar with the construction site,and knowledgeable of the (e) Permittees shall design and utilize appropriate controls to minimize the offsite SWP3 for the site. Sediment and erosion control measures identified in the transport of suspended sediments and other pollutants if it is necessary to pump SWP3 must be inspected to ensure that they are operating correctly. Locations or channel standing water from the site. where vehicles enter or exit the site must be inspected for evidence of off-site (f) Permittees shall ensure that all other required controls and BMPs comply with sediment tracking. Inspections must be conducted at least once every 14 all of the requirements of Part IILG of this general permit. calendar days and within 24 hours of the end of a storm event of 0.5 inches or greater. 5. Documentation of Compliance with Approved State and Local Plans Where sites have been finally or temporarily stabilized or where runoff is (a) Permittees must ensure that the SWP3 is consistent with requirements specified unlikely due to winter conditions(e.g.site is covered with snow,ice,or frozen in applicable sediment and erosion site plans or site permits,or stormwater ground exists),inspections must be conducted at least once every month. In management site plans or site permits approved by federal,state,or local arid,semi-arid,or drought-stricken areas,inspections must be conducted at officials. least once every month and within 24 hours after the end of a storm event of 0.5 (b) SWP3s must be updated as necessary to remain consistent with any changes inches or greater.The SWP3 must also contain a record of the total rainfall applicable to protecting surface water resources in sediment erosion site plans or measured,as well as the approximate beginning and ending dates of winter or site permits,or stormwater management site plans or site permits approved by drought conditions resulting in monthly frequency of inspections. state or local official for which the permittee receives written notice. As an alternative to the above-described inspection schedule of once every 14 (c) If the permittee is required to prepare a separate management plan,including calendar days and within 24 hours of a storm event of o.5 inches or greater,the but not limited to a WPAP or Contributing Zone Plan in accordance with 3o TAC SWP3 maybe developed to require that these inspections will occur at least once Chapter 213(related to the Edwards Aquifer),then a copy of that plan must be every seven(7)calendar days. If this alternative schedule is developed,then the either included in the SWP3 or made readily available upon request to inspection must occur regardless of whether or not there has been a rainfall authorized personnel of the TCEQ.The permittee shall maintain a copy of the event since the previous inspection. approval letter for the plan in its SWP3. The inspections may occur on either schedule provided that the SWP3 reflects 6. Maintenance Requirements the current schedule and that any changes to the schedule are conducted in accordance with the following provisions:the schedule maybe changed a (a) All protective measures identified in the SWP3 must be maintained in effective maximum of one time each month,the schedule change must be implemented at operating condition. If,through inspections or other means,the permittee the beginning of a calendar month,and the reason for the schedule change must determines that BMPs are not operating effectively,then the permittee shall be documented in the SWP3(e.g.,end of"dry"season and beginning of"wet" perform maintenance as necessary to maintain the continued effectiveness of season). stormwater controls,and prior to the next rain event if feasible. If maintenance prior to the next anticipated storm event is impracticable,the reason shall be (b) Utility line installation,pipeline construction,and other examples of long, documented in the SWP3 and maintenance must be scheduled and narrow,linear construction activities may provide inspection personnel with accomplished as soon as practicable. Erosion and sediment controls that have limited access to the areas described in Part III.F.7.(a)above. Inspection of been intentionally disabled,run-over,removed,or otherwise rendered these areas could require that vehicles compromise temporarily or even ineffective must be replaced or corrected immediately upon discovery. permanently stabilized areas,cause additional disturbance of soils,and increase the potential for erosion. In these circumstances,controls must be inspected at (b) If periodic inspections or other information indicates a control has been used least once every 14 calendar days and within 24 hours of the end of a storm event incorrectly,is performing inadequately,or is damaged,then the operator shall of 0.5 inches or greater,but representative inspections maybe performed. For replace or modify the control as soon as practicable after making the discovery. representative inspections,personnel must inspect controls along the (c) Sediment must be removed from sediment traps and sedimentation ponds no construction site for 0.25 mile above and below each access point where a later than the time that design capacity has been reduced by 50%. For perimeter roadway,undisturbed right-of-way,or other similar feature intersects the construction site and allows access to the areas described in Part III.F.7.(a) Page 31 Page 32 Construction General Permit TPDES General Permit TXRl50000 Construction General Permit TPDES General Permit TXR150oo0 above.The conditions of the controls along each inspected 0.25 mile portion Section G. Erosion and Sediment Control Requirements Applicable to All Sites may be considered as representative of the condition of controls along that reach extending from the end of the 0.25 mile portion to either the end of the next 0.25 Except as provided in 40 CFR§§125.30-125.32,any discharge regulated under this mile inspected portion,or to the end of the project,whichever occurs first. general permit,with the exception of sites that obtained waivers based on low rainfall erosivity,must achieve,at a minimum,the following effluent limitations representing As an alternative to the above-described inspection schedule of once every 14 the degree of effluent reduction attainable by application of the best practicable control calendar days and within 24 hours of a storm event of 0.5 inches or greater,the technology currently available(BPT). SWP3 maybe developed to require that these inspections will occur at least once every seven(7)calendar days. If this alternative schedule is developed,the 1. Erosion and sediment controls.Design,install,and maintain effective erosion inspection must occur regardless of whether or not there has been a rainfall controls and sediment controls to minimize the discharge of pollutants.At a event since the previous inspection.The inspections may occur on either minimum,such controls must be designed,installed,and maintained to: schedule provided that the SWP3 reflects the current schedule and that any (a)Control stormwater volume and velocity within the site to minimize soil erosion; changes to the schedule are conducted in accordance with the following provisions: the schedule may be changed a maximum of one time each month, (b)If any stormwater flow will be channelized at the site,stormwater controls must the schedule change must he implemented at the beginning of a calendar month, be designed to control both peak flowrates and total stormwater volume to and the reason for the schedule change must be documented in the SWP3(e.g., minimize erosion at outlets and to minimize downstream channel and end of"dry"season and beginning of"wet"season). streambank erosion; (c) In the event of flooding or other uncontrollable situations which prohibit access (c)Minimize the amount of soil exposed during construction activity; to the inspection sites,inspections must be conducted as soon as access is (d)Minimize the disturbance of steep slopes; practicable. (e)Minimize sediment discharges from the site.The design,installation,and (d) The SWP3 must be modified based on the results of inspections,as necessary,to maintenance of erosion and sediment controls must address factors such as the better control pollutants in runoff. Revisions to the SWP3 must be completed amount,frequency,intensity and duration of precipitation,the nature of resulting within seven(7)calendar days following the inspection. If existing BMPs are stormwater runoff,and soil characteristics,including the range of soil particle modified or if additional BM Ps are necessary,an implementation schedule must sizes expected to be present on the site; be described in the SWP3 and wherever possible those changes implemented before the next storm event. If implementation before the next anticipated (f) If earth disturbance activities are located in close proximity to a surface water, storm event is impracticable,these changes must be implemented as soon as provide and maintain appropriate natural buffers if feasible and as necessary, practicable. around surface waters,depending on site-specific topography,sensitivity,and proximity to water bodies. Direct stormwater to vegetated areas to increase (e) A report summarizing the scope of the inspection,the date(s)of the inspection, sediment removal and maximize stormwater infiltration. If providing buffers is and major observations relating to the implementation of the SWP3 must be infeasible,the permittee shall document the reason that natural buffers are not made and retained as part of the SWP3. Major observations should include: feasible,and shall implement additional erosion and sediment controls to reduce The locations of discharges of sediment or other pollutants from the site; sediment load; locations of BMPs that need to be maintained;locations of BMPs that failed to p (g)Preserve native topsoil at the site,unless infeasible;and operate as designed or proved inadequate for a particular location;and locations where additional BMPs are needed. (h)Minimize soil compaction in post-construction pervious areas. In areas of the Actions taken as a result of inspections must be described within,and retained construction site where final vegetative stabilization will occur or where as a part of,the SWP3. Reports must identify any incidents of non-compliance. infiltration practices will be installed,either: Where a report does not identify any incidents of non-compliance,the report (1)restrict vehicle and equipment use to avoid soil compaction;or must contain a certification that the facility or site is in compliance with the SWP3 and this permit. The report must be signed by the person and in the (2)prior to seeding or planting areas of exposed soil that have been compacted, manner required by 3o TAC§305.128(relating to Signatories to Reports). use techniques that condition the soils to support vegetative growth,if necessary and feasible; The names and qualifications of personnel making the inspections for the permittee may be documented once in the SWP3 rather than being included in (i) TCEQ does not consider stormwater control features(e.g.,stormwater each report. conveyance channels,storm drain inlets,sediment basins)to constitute"surface waters"for the purposes of triggering the buffer requirement in Part III.G.(t) 8. The SWP3 must identify and ensure the implementation of appropriate pollution above. prevention measures for all eligible non-stormwater components of the discharge,as 2. Soil stabilization.Stabilization of disturbed areas must,at a minimum,be initiated listed in Part II.A.3.of this permit. immediately whenever any clearing,grading,excavating,or other earth disturbing 9. The SWP3 must include the information required in Part III.B.of this general permit. activities have permanently ceased on any portion of the site,or temporarily ceased to.The SWP3 must include pollution prevention procedures that comply with Part on any portion of the site and will not resume for a period exceeding 14 calendar IILG.4 of this general permit. days. In the context of this requirement,"immediately"means as soon as practicable, but no later than the end of the next work day,following the day when the earth- disturbing activities have temporarily or permanently ceased.Temporary Page 33 Page 34 Construction General Permit TPDES General Permit TXR1500oo Construction General Permit TPDES General Permit TXR150000 stabilization must be completed no more than 14 calendar days after initiation of soil of this section of this general permit,and must conduct evaluations on the stabilization measures,and final stabilization must be achieved prior to termination of effectiveness of the SWP3 based on the following benchmark monitoring values: permit coverage.In arid,semi-arid,and drought-stricken areas where initiating vegetative stabilization measures immediately is infeasible,alternative non- Table i.Benchmark Parameters vegetative stabilization measures must be employed as soon as practicable.Refer to Part III.F.2.(b)for complete erosion control and stabilization practice requirements. Benchmark Benchmark Value Sampling Sample Type Parameter Frequency 3. Dewatering.Discharges from dewatering activities,including discharges from Oil and Grease 15 mg/L 1/quarter(*1)(*z) Grab(*3) dewatering of trenches and excavations,are prohibited,unless managed by appropriate controls. Total Suspended too mg/L i/quarter(*1)(*2) Grab(*3) 4. Pollution prevention measures.Design,install,implement,and maintain effective Solids pollution prevention measures to minimize the discharge of pollutants.At a pH 6.o—9.o Standard 1/quarter(*1)(*2) Grab(*3) minimum,such measures must be designed,installed,implemented,and maintained Units to: (a)Minimize the discharge of pollutants from equipment and vehicle washing,wheel Total Iron 1.3 mg/L 1/quarter(*1)(*z) Grab(*3) wash water,and other wash waters.Wash waters must be treated in a sediment basin or alternative control that provides equivalent or better treatment prior to (*1) When discharge occurs.Sampling is required within the first 3o minutes of discharge; discharge. If it is not practicable to take the sample,or to complete the (b)Minimize the exposure of building materials,building products,construction sampling,within the first 3o minutes,sampling must be completed within the wastes,trash,landscape materials,fertilizers,pesticides,herbicides,detergents, first hour of discharge. If sampling is not completed within the first 3o sanitary waste,and other materials present on the site to precipitation and to minutes of discharge,the reason must be documented and attached to all stormwater;and required reports and records of the sampling activity. (c)Minimize the discharge of pollutants from spills and leaks,and implement (*2) Sampling must be conducted at least once during each of the following periods. chemical spill and leak prevention and response procedures. The first sample must be collected during the first full quarter that a stormwater discharge occurs from a concrete batch plant authorized under this 5. Prohibited discharges.The following discharges are prohibited: general permit. (a)Wastewater from wash out of concrete trucks,unless managed by an appropriate January through March control(see Part V of the general permit); (b)Wastewater from wash out and cleanout of stucco,paint,form release oils,curing April through June compounds and other construction materials; July through September (c) Fuels,oils,or other pollutants used in vehicle and equipment operation and October through December maintenance;and For projects lasting less than one full quarter,a minimum of one sample shall (d)Soaps or solvents used in vehicle and equipment washing. be collected,provided that a stormwater discharge occurred at least once following submission of the NOI or following the date that automatic 6. Surface outlets.When discharging from basins and impoundments,utilize outlet authorization was obtained under Section II.E.2.,and prior to terminating structures that withdraw water from the surface,unless infeasible. coverage. Part IV. Stormwater Runoff from Concrete Batch Plants (*3) A grab sample shall be collected from the stormwater discharge resulting from a storm event that is at least 0.1 inches of measured precipitation that occurs at Discharges of stormwater runoff from concrete batch plants at regulated construction sites least 72 hours from the previously measurable storm event.The sample shall maybe authorized under the provisions of this general permit provided that the following be collected downstream of the concrete batch plant,and where the discharge requirements are met for concrete batch plant(s)authorized under this permit. If discharges exits any BMPs utilized to handle the runoff from the batch plant,prior to of stormwater runoff from concrete batch plants are not covered under this general permit, commingling with any other water authorized under this general permit. then discharges must be authorized under an alternative general permit or individual permit. 2. The permittee must compare the results of sample analyses to the benchmark values This permit does not authorize the discharge or land disposal of any wastewater from above,and must include this comparison in the overall assessment of the SWP3's concrete batch plants at regulated construction sites.Authorization for these wastes must be effectiveness.Analytical results that exceed a benchmark value are not a violation of obtained under an individual permit or an alternative general permit. this permit,as these values are not numeric effluent limitations. Results of analyses Section A. Benchmark Sampling Requirements are indicators that modifications of the SWP3 should be assessed and may be necessary to protect water quality.The operator must investigate the cause for each 1. Operators of concrete batch plants authorized under this general permit shall sample exceedance and must document the results of this investigation in the SWP3 by the the stormwater runoff from the concrete batch plants according to the requirements end of the quarter following the sampling event. Page 35 Page 36 Construction General Permit TPDES General Permit TXRl50000 Construction General Permit TPDES General Permit TXR150000 The operator's investigation must identify the following: affect the quality of stormwater discharges associated with concrete batch (a) any additional potential sources of pollution,such as spills that might have plants that are authorized under this general permit. occurred, (c) Spills and Leaks-A list of significant spills and leaks of toxic or hazardous (b) necessary revisions to good housekeeping measures that are part of the SWP3, pollutants that occurred in areas exposed to stormwater and that drain to (c) additional BMPs,including a schedule to install or implement the BMPs,and stormwater outfalls associated with concrete batch plants authorized under this g P general permit must be developed,maintained,and updated as needed. (d) other parts of the SWP3 that may require revisions in order to meet the goal of (d) Sampling Data-A summary of existing stormwater discharge sampling data the benchmark values. must be maintained,if available. Background concentrations of specific pollutants may also be considered during the 2. Measures and Controls-The SWP3 must include a description of management investigation. If the operator is able to relate the cause of the exceedance to controls to regulate pollutants identified in the SWP3's"Description of Potential background concentrations,then subsequent exceedances of benchmark values for Pollutant Sources"from Part IV.B.r.(a)of this permit,and a schedule for that pollutant maybe resolved by referencing earlier findings in the SWP3• implementation of the measures and controls.This must include,at a minimum: Background concentrations may be identified by laboratory analyses of samples of stormwater runon to the permitted facility,by laboratory analyses of samples of (a) Good Housekeeping-Good housekeeping measures must be developed and stormwater run-off from adjacent non-industrial areas,or by identifying the implemented in the area(s)associated with concrete batch plants. pollutant is a naturally occurring material in soils at the site. (t) Operators must prevent or minimize the discharge of spilled cement, aggregate(including sand or gravel),settled dust,or other significant Section B. Best Management Practices(BMPs)and SWP3 Requirements materials from paved portions of the site that are exposed to stormwater. Minimum SWP3 Requirements—The following are required in addition to other SWP3 Measures used to minimize the presence of these materials may include requirements listed in this general permit(including,but not limited to Part IILF.7.of regular sweeping or other equivalent practices.These practices must be this permit): conducted at a frequency that is determined based on consideration of the amount of industrial activity occurring in the area and frequency of 1. Description of Potential Pollutant Sources-The SWP3 must provide a description of precipitation,and shall occur at least once per week when cement or potential sources(activities and materials)that may reasonably be expected to affect aggregate is being handled or otherwise processed in the area. the quality of stormwater discharges associated with concrete batch plants authorized under this permit.The SWP3 must describe practices that that will be used to reduce (2) Operators must prevent the exposure of fine granular solids,such as the pollutants in these discharges to assure compliance with this general permit, cement,to stormwater.Where practicable,these materials must be stored including the protection of water quality,and must ensure the implementation of in enclosed silos,hoppers or buildings,in covered areas,or under covering. these practices. (b) Spill Prevention and Response Procedures-Areas where potential spills that The following must be developed,at a minimum,in support of developing this can contribute pollutants to stormwater runoff,and the drainage areas from description: these locations,must be identified in the SWP3.Where appropriate,the SWP3 must specify material handling procedures,storage requirements,and use of (a) Drainage—The site map must include the following information: equipment. Procedures for cleaning up spills must be identified in the SWP3 (1) the location of all outfalls for stormwater discharges associated with and made available to the appropriate personnel. concrete batch plants that are authorized under this permit; (c) Inspections-Qualified facility personnel(i.e.,a person or persons with (2) a depiction of the drainage area and the direction of flow to the outfall(s); knowledge of this general permit,the concrete batch plant,and the SWP3 related to the concrete batch plant(s)for the site)must be identified to inspect (3) structural controls used within the drainage area(s); designated equipment and areas of the facility specified in the SWP3.The (4) the locations of the following areas associated with concrete batch plants inspection frequency must be specified in the SWP3 based upon a consideration that are exposed to precipitation:vehicle and equipment maintenance of the level of concrete production at the facility,but must be a minimum of activities(including fueling,repair,and storage areas for vehicles and once per month while the facility is in operation.The inspection must take place equipment scheduled for maintenance);areas used for the treatment, while the facility is in operation and must,at a minimum,include all areas that storage,or disposal of wastes;liquid storage tanks;material processing and are exposed to stormwater at the site,including material handling areas,above storage areas;and loading and unloading areas;and ground storage tanks,hoppers or silos,dust collection/containment systems, truck wash down and equipment cleaning areas. Follow-up procedures must be (5) the locations of the following:any bag house or other dust control used to ensure that appropriate actions are taken in response to the inspections. device(s);recycle/sedimentation pond,clarifier or other device used for the Records of inspections must be maintained and be made readily available for treatment of facility wastewater(including the areas that drain to the inspection upon request. treatment device);areas with significant materials;and areas where major spills or leaks have occurred. (d) Employee Training-An employee training program must be developed to (b) Inventory of Exposed Materials—A list of materials handled at the concrete educate personnel responsible for implementing any component of the SWP3, or personnel otherwise responsible for stormwater pollution prevention,with batch plant that may be exposed to stormwater and that have a potential to the provisions of the SWP3.The frequency of training must be documented in Page 37 Page 38 Construction General Permit TPDES General Permit TXR150000 Construction General Permit TPDES General Permit TXR150000 the SWP3,and at a minimum,must consist of one training prior to the Part V. Concrete Truck Wash Out Requirements initiation of operation of the concrete batch plant. This general permit authorizes the wash out of concrete trucks at construction sites regulated (e) Record Keeping and Internal Reporting Procedures-A description of spills and under Sections II.E.r.,2.,and 3.of this general permit,provided the following requirements similar incidents,plus additional information that is obtained regarding the are met. Authorization is limited to the land disposal of wash out water from concrete quality and quantity of stormwater discharges,must be included in the SWP3 trucks.Any other direct discharge of concrete production waste water must be authorized Inspection and maintenance activities must be documented and records of under a separate TCEQ general permit or individual permit. those inspection and maintenance activities must be incorporated in the SWP3. 1. Direct discharge of concrete truck wash out water to surface water in the state, (t) Management of Runoff-The SWP3 shall contain a narrative consideration for including discharge to storm sewers,is prohibited by this general permit. reducing the volume of runoff from concrete batch plants by diverting runoff or otherwise managing runoff,including use of infiltration,detention ponds, 2. Concrete truck wash out water shall be discharged to areas at the construction site retention ponds,or reusing of runoff. where structural controls have been established to prevent direct discharge to surface waters,or to areas that have a minimal slope that allow infiltration and filtering of 3. Comprehensive Compliance Evaluation—At least once per year,one or more wash out water to prevent direct discharge to surface waters. Structural controls may qualified personnel(i.e.,a person or persons with knowledge of this general permit, consist of temporary berms,temporary shallow pits,temporary storage tanks with the concrete batch plant,and the SWP3 related to the concrete batch plant(s)for the slow rate release,or other reasonable measures to prevent runoff from the site)shall conduct a compliance evaluation of the plant.The evaluation must include construction site. the following. (a) Visual examination of all areas draining stormwater associated with regulated 3. Wash out of concrete trucks during rainfall events shall be minimized.The direct g g discharge of concrete truck wash out water is prohibited at all times,and the operator concrete batch plants for evidence of,or the potential for,pollutants entering shall insure that its BMPs are sufficient to prevent the discharge of concrete truck the drainage system.These include but are not limited to: cleaning areas, wash out as the result of rainfall or stormwater runoff. material handling areas,above ground storage tanks,hoppers or silos,dust collection/containment systems,and truck wash down and equipment cleaning 4. The discharge of wash out water must not cause or contribute to groundwater areas. Measures implemented to reduce pollutants in runoff(including contamination. structural controls and implementation of management practices)must be 5. If a SWP3 is required to be implemented,the SWP3 shall include concrete wash out evaluated to determine if they are effective and if they are implemented in areas on the associated site map. accordance with the terms of this permit and with the permittee's SWP3.The operator shall conduct a visual inspection of equipment needed to implement Part VI. Retention of Records the SWP3,such as spill response equipment. The permittee must retain the following records for a minimum period of three(3)years (b) Based on the results of the evaluation,the following must be revised as from the date that a NOT is submitted as required by Part II.E.3. For activities in which an appropriate within two weeks of the evaluation: the description of potential NOT is not required,records shall be retained for a minimum period of three(3)years from pollutant sources identified in the SWP3(as required in Part IV.B.r., the date that the operator terminates coverage under Section II.F.3.of this permit. Records "Description of Potential Pollutant Sources");and pollution prevention include: measures and controls identified in the SWP3(as required in Part W.B.2., "Measures and Controls").The revisions may include a schedule for 1. A copy of the SWP3; implementing the necessary changes. 2. All reports and actions required by this permit,including a copy of the construction (c) The permittee shall prepare and include in the SWP3 a report summarizing the site notice; scope of the evaluation,the personnel making the evaluation,the date(s)of the 3. All data used to complete the NOI,if an NOI is required for coverage under this evaluation,major observations relating to the implementation of the SWP3,and general permit;and actions taken in response to the findings of the evaluation.The report must identify any incidents of noncompliance.Where the report does not identify 4• All records of submittal of forms submitted to the operator of any MS4 receiving the incidences of noncompliance,the report must contain a statement that the discharge and to the secondary operator of a large construction site,if applicable. evaluation did not identify any incidence(s),and the report must be signed Part VII. Standard Permit Conditions according to 3o TAC§305.128,relating to Signatories to Reports. (d) The Comprehensive Compliance Evaluation may substitute for one of the 1. The permittee has a duty to comply with all permit conditions. Failure to comply required inspections delineated in Part IV.B.2.(c)of this general permit. with any permit condition is a violation of the permit and statutes under which it was issued,and is grounds for enforcement action,for terminating,revoking,or denying Section C. Prohibition of Wastewater Discharges coverage under this general permit,or for requiring a discharger to apply for and Wastewater discharges associated with concrete production including wastewater obtain an individual TPDES permit. disposal by land application are not authorized under this general permit.These 2. Authorization under this general permit may be suspended or revoked for cause. wastewater discharges must be authorized under an alternative TCEQ water quality Filing a notice of planned changes or anticipated non-compliance by the permittee permit or otherwise disposed of in an authorized manner. Discharges of concrete truck does not stay any permit condition.The permittee must furnish to the executive wash out at construction sites maybe authorized if conducted in accordance with the director,upon request and within a reasonable time,any information necessary for requirements of Part V of this general permit. the executive director to determine whether cause exists for revoking,suspending,or Page 39 Page 40 Construction General Permit TPDES General Permit TXR150000 Construction General Permit TPDES General Permit TXR150000 terminating authorization under this permit.Additionally,the permittee must 2. Fees are due upon submission of the NOI.An NOI will not be declared provide to the executive director,upon request,copies of all records that the administratively complete unless the associated fee has been paid in full. permittee is required to maintain as a condition of this general permit. 3. No separate annual fees will be assessed for this general permit.The Water Quality 3. It is not a defense for a discharger in an enforcement action that it would have been Annual Fee has been incorporated into the NOI fees as described above. necessary to halt or reduce the permitted activity to maintain compliance with the permit conditions. 4. Inspection and entry shall be allowed under TWC Chapters 26-28,Texas Health and Safety Code§§361.032-361.033 and 361.037,and 4o CFR§122.41(i).The statement in TWC§26.014 that commission entry of a facility shall occur according to an establishment's rules and regulations concerning safety,internal security,and fire protection is not grounds for denial or restriction of entry to any part of the facility or site,but merely describes the commission's duty to observe appropriate rules and regulations during an inspection. 5. The discharger is subject to administrative,civil,and criminal penalties,as applicable,under TWC Chapter 7 for violations including but not limited to the following: (a) negligently or knowingly violating the federal CWA§§3o1,302,306,307,308, 318,or 405,or any condition or limitation implementing any sections in a permit issued under CWA§402,or any requirement imposed in a pretreatment program approved under CWA§§402(a)(3)or 402(b)(8); (b) knowingly making any false statement,representation,or certification in any record or other document submitted or required to be maintained under a permit,including monitoring reports or reports of compliance or noncompliance;and (c) knowingly violating§303 of the federal CWA,and placing another person in imminent danger of death or serious bodily injury. 6. All reports and other information requested by the executive director must be signed by the person and in the manner required by 3o TAC§305.128(relating to Signatories to Reports). 7. Authorization under this general permit does not convey property or water rights of any sort and does not grant any exclusive privilege. 8. The permittee shall take all reasonable steps to minimize or prevent any discharge in violation of this permit that has a reasonable likelihood of adversely affecting human health or the environment. 9. The permittee shall at all times properly operate and maintain all facilities and systems of treatment and control(and related appurtenances)which are installed or used by the permittee to achieve compliance with the conditions of this permit. Proper operation and maintenance also includes adequate laboratory controls and appropriate quality assurance procedures.This provision requires the operation of back-up or auxiliary facilities or similar systems which are installed by a permittee only when the operation is necessary to achieve compliance with the conditions of the permit. 10.The permittee shall comply with the reporting requirements in 4o CFR§122.41(1),as applicable. Part VIII. Fees 1. A fee of must be submitted along with the NOI: (a) $325 if submitting a paper NOI,or (b) $225 if submitting an NOI electronically. Page 41 Page 42 Construction General Permit TPDES General Permit TXR150000 Construction General Permit TPDES General Permit TXR150000 Appendix A: Automatic Authorization Loving: Nov.1-Apr.30,or Nov.15-May Scurry: Nov.15-Apr.30 Periods of Low Erosion Potential by County-Eligible Date Ranges 14 Shackelford: Dec.15-Feb.14 Andrews: Nov.1 Apr. o Ector: Nov.1 Apr. o Lubbock: Nov.15-Apr.3o Sherman: Nov.1 Apr. o 5- P 3 5- P 3 5- P 3 Archer: Dec.15-Feb.14 Edwards: Dec.15-Feb.14 Lynn: Nov.15-Apr.30 Stephens: Dec.15-Feb.14 Armstrong: Nov.1 Apr. o El Paso: Jan.1-Jul.1 or May 1 Jul. Martin: Nov.15-Apr.3o Sterling: Nov.1 Apr.,o g 5- P 3 4, Y 5- g 5- P 3 Bailey: Nov.1-Apr.30,or Nov.15-May 31,or Jun.1-Aug.14,or Jun.15-Sept.14, Mason: Dec.15-Feb.14 Stonewall: Dec.15-Feb.14 14 or Jul.i-Oct.14,or Jul.15-Oct.31,or Maverick: Dec.15-Feb.14 Aug.1-Apr.30,or Aug.15-May 14,or Sutton: Dec.15-Feb.14 Baylor: Dec.15-Feb.14 Sept.1-May 30,or Oct.1-Jun.14,or McCulloch: Dec.15-Feb.14 Swisher: Nov.15-Apr.30 Borden: Nov.15-Apr.30 Nov.1-Jun.30,or Nov.15-Jul.14 Menard: Dec.15-Feb.14 Fisher: Dec.15-Feb.14 Taylor: Dec.15-Feb.14 Brewster: Nov.15-Apr.30 Midland: Nov.15-Apr.3o Terrell: Nov.15-Apr.30 Briscoe: Nov.15-Apr.30 Floyd: Nov.15-Apr.30 Mitchell: Nov.15-Apr.3o Terry: Nov.15-Apr.30 Brown: Dec.15-Feb.14 Foard: Dec.15-Feb.14 Moore: Nov.15-Apr.30 Throckmorton: Dec.15-Feb.14 Callahan: Dec.15-Feb.14 Gaines: Nov.15-Apr.3o Motley: Nov.15-Jan.14,or Feb.1-Mar. Carson: Nov.15-Apr.3o Garza: Nov.15-Apr.30 30 Tom Green: Dec.15-Feb.14 Castro: Nov.15-Apr.3o Glasscock: Nov.15-Apr.3o Nolan: Dec.15-Feb.14 Upton: Nov.15-Apr.30 Childress: Dec.15-Feb.14 Hale: Nov.15-Apr.3o Oldham: Nov.15-Apr.30 Uvalde: Dec.15-Feb.14 Parmer: Nov.1-Apr.14, Nov.1 Apr. Val Verde: Nov.15-Jan.14,or Feb.1- Cochran: Nov.1-Apr.30,or Nov.15- Hall: Feb.1-Mar.30 3o P• 4,or 5- Mar.30 May14 Hansford: Nov.15-Apr.3o Coke: Dec.15-Feb.14 Hardeman: Dec.15-Feb.14 Pecos: Nov.15-Apr.30 Ward: Nov.1-Apr.14,or Nov.15-Apr. Coleman: Dec.15-Feb.14 Hartley: Nov.15-Apr.3o Potter: Nov.15-Apr.3o Wichita: Dec.15-Feb.14 Collingsworth:Jan.1-Mar.30,or Dec.1- Haskell: Dec.15-Feb.14 IPdrayido: Nov.1-Apr.30,or Nov.15- Wilbarger: Dec.15-Feb.14 Feb.28 Hockley: Nov.1-Apr.1 or Nov.1 Winkler: Nov.1-Apr.3 0,or Nov.1 Y P 4, 5- Randall: Nov.15-Apr.3o F 3 5- Concho: Dec.15-Feb.14 Apr.3o May 1q Cottle: Dec.15-Feb.14 (toward: Nov.15-Apr.3o Reagan: Nov.15-Apr.3o Yoakum: Nov.1-Apr.30,or Nov.15- Crane: Nov.15-Apr.3o Itudspeth: Nov.1-May 14 Real: Dec.15-Feb.14 May 14 Reeves: Nov.1-Apr.30,or Nov.15-May Young: Dec.15-Feb.14 Crockett: Nov.15-Jan.14,or Feb.1- Itutchinson: Nov.15-Apr.30 14 Wheeler: Jan.1-Mar.30,or Dec.1-Feb. Mar.3o Irion: Dec.15-Feb.14 Crosby: Nov.15-Apr.30 Runnels: Dec.15-Feb.14 28 Jeff Davis: Nov.1-Apr.30 or Nov.15- Schleicher: Dec.15-Feb.14 Zavala: Dec.15-Feb.14 Culberson: Nov.1-May 14 May 14 Dallam: Nov.1-Apr.14,or Nov.15-Apr. Jones: Dec.15-Feb.14 30 Kent: Nov.15-Jan.14 or Feb.1-Mar.30 Dawson: Nov.15-Apr.30 Kerr: Dec.15-Feb.14 Deaf Smith: Nov.15-Apr.3o Kimble: Dec.15-Feb.14 Dickens: Nov.15-Jan.14,or Feb.1-Mac King: Dec.15-Feb.14 30 Dimmit: Dec.15-Feb.14 Kinney: Dec.15-Feb.14 Donley: Jan.1-Mar.30,or Dec.1-Feb. Knox: Dec.15-Feb.14 28 Lamb: Nov.1-Apr.14,or Nov.15-Apr. Eastland: Dec.15-Feb.14 30 Page 43 Page 44 Construction General Permit TPDES General Permit TXRl50000 Construction General Permit TPDES General Permit TXR150000 Appendix B:Erosivity Index(El)Zones in Texas Appendix C: Isoerodent Map } : . .......•.*:x 0! r__ .._. -_----.7.74%.".t.) /Vi; I.i� �:'=omits. w L +t �a f .1 �......6.,• ., llCi�1� jar�1��'t7��ri�t#F�'+�_s t t \ 14i* kraT g g44• Z Ji1 11 -- Stul ulirlt��RSriNr,117r1-1;466r..211;ev.i iit111911 �l f..IP ' "fir-- r ±rd> ".-. , ' r ..' —93— ,q.i.:.41 ' tr......':. 14Najf itifflitliltpi A ir es-,,,,i,1141A1110401,41."IT' 4114. 1 x �`'� r'hialr p1�'.� s• it. C. j.. 40Ifi1lr Door IN Adapted from Chapter 2 of USDA Agriculture Handbook 703:"Predicting Soil Erosion by Water:A Guide to Adapted from Chapter 2 of USDA Agriculture Handbook 7o3:"Predicting Soil Erosion by Water:A Guide to Conservation Planning With the Revised Universal Soil Loss Equation(RUBLE),"11.5.Deportment Conservation Planning With the Revised Universal Soil Loss Equation(RUSLE),"U.S.Department of Agriculture,Agricultural Research Service Agriculture,Agricultural Research Service Page 45 Page 46 Construction General Permit TPDES General Permit TXRr50000 Appendix D: Erosivity Indices for El Zones in Texas Periods: El 8 ,/, ,/,6 1/31 2/15 3/1 3/16 3/31 4/15 4/30 5/15 5/30 6/14 6/29 7/14 7/29 8/13 8/28 9/12 9/27 10/121o/2711/11 0/2612/0 12/31 89 o 1 I 2 3 4 7 2 8 27 38 48 55 62 69 76 83 90 94 97 98 99 too 100 100 90 0 1 2 3 4 6 8 13 21 29 37 46 54 6o 65 09 74 81 87 92 95 97 98 99 too 91 0 0 0 0 1 1 t 2 6 16 29 39 46 53 Go 67 74 81 88 95 99 99 100 t 92 0 0 0 0 1 1 1 2 6 16 29 39 46 53 6o 67 74 81 88 95 99 99 100 100 100 93 0 1 1 2 3 4 6 8 13 25 40 49 56 62 67 72 76 80 85 91 97 98 99 99 too 94 0 1 2 4 6 8 10 15 2, 29 38 47 53 57 61 65 7o 76 83 88 91 94 90 98 loo 95 0 1 3 5 7 9 11 14 18 27 35 41 46 51 57 02 68 73 79 84 89 93 96 98 100 96 0 2 4 0 9 12 17 23 30 37 43 49 54 58 62 66 7o 74 78 82 80 90 94 97 too 97 0 1 3 5 7 10 14 20 28 37 48 50 61 64 68 72 77 81 80 89 92 95 98 99 loo 106 0 3 6 9 13 17 21 27 33 38 44 49 55 61 67 71 75 78 81 84 86 90 94 97 100 Each period begins on the date listed in the table above and lasts until the day before the following period.The final period begins on December it and ends on December 31. Table adapted from Chapter z of USDA Agriculture Handbook 7o3:"Predicting Soil Erosion by Water:A Guide to Conservation Planning With the Revised Universal Soil Loss Equation(RUSLE),°U.S.Department of Agriculture, Agricultural Research Service Page 47 Appendix M Concrete Batch P/ant Requirements Material Management Sheet Pollution Prevention Team Employee Training Form Quarterly Visual Monitoring Form Annual Comprehensive Compliance Form Non-Storm Water Discharges DMR Report Rain Gauge Log This Appendix contains information regarding the use of Supporting Concrete Batch Plants for Construction Activities and copies of the DMR Report required for Concrete Batch Plants. Page 1 of 7 Storm Water Runoff from Concrete Batch Plants Discharges of storm water runoff from concrete batch plants at regulated construction sites may be authorized under the provisions of this general permit provided that the following requirements are met for concrete batch plant(s) authorized under this permit. If discharges of storm water runoff from concrete batch plants are not covered under this general permit, then discharges must be authorized under an alternative general permit or individual permit. This permit does not authorize the discharge or land disposal of any wastewater from concrete batch plants at regulated construction sites. Authorization for these wastes must be obtained under an individual permit or an alternative general permit. Section A. Benchmark Sampling Requirements 1. Operators of concrete batch plants authorized under this general permit must sample the storm water runoff from the concrete batch plants according to the requirements of this section of this general permit, and must conduct evaluations on the effectiveness of the SWP3 based on the following benchmark monitoring values: Benchmark Benchmark Sampling Sample Type Parameter Value Frequency Oil and Grease 15 mg/L 1/quarter (*1)(*2) Grab (*3) Total Suspended 100 mg/L 1/quarter (*1)(*2) Grab (*3) Solids pH 6.0 - 9.0 1/quarter (*1)(*2) Grab (*3) Standard Units Total Iron 1.3 mg/L 1/quarter(*1)(*2) Grab (*3) (*1) When discharge occurs. Sampling is required within the first 30 minutes of discharge. If it is not practicable to take the sample, or to complete the sampling, within the first 30 minutes, sampling must be completed within the first hour of discharge. If sampling is not completed within the first 30 minutes of discharge, the reason must be documented and attached to all required reports and records of the sampling activity. (*2) Sampling must be conducted at least once during each of the following periods. The first sample must be collected during the first full quarter that a storm water discharge occurs from a concrete batch plant authorized under this general permit. January through March April through June July through September October through December Page 3 of 7 Description of Potential Pollutant Sources - The SWP3 must provide a description of potential sources (activities and materials) that may reasonably be expected to affect the quality of storm water discharges associated with concrete batch plants authorized under this permit. The SWP3 must describe practices that that will be used to reduce the pollutants in these discharges to assure compliance with this general permit, including the protection of water quality, and must ensure the implementation of these practices. The following must be developed, at a minimum, in support of developing this description: (a) Drainage -The site map must include the following information: (1) the location of all outfalls for storm water discharges associated with concrete batch plants that are authorized under this permit; (2) a depiction of the drainage area and the direction of flow to the outfall(s); (3) structural controls used within the drainage area(s); (4) the locations of the following areas associated with concrete batch plants that are exposed to precipitation: vehicle and equipment maintenance activities (including fueling, repair, and storage areas for vehicles and equipment scheduled for maintenance); areas used for the treatment, storage, or disposal of wastes; liquid storage tanks; material processing and storage areas; and loading and unloading areas; and (5) the locations of the following: any bag house or other dust control device(s); recycle/sedimentation pond, clarifier or other device used for the treatment of facility wastewater (including the areas that drain to the treatment device); areas with significant materials; and areas where major spills or leaks have occurred. Inventory of Exposed Materials - A list of materials handled at the concrete batch plant that may be exposed to storm water and that have a potential to affect the quality of storm water discharges associated with concrete batch plants that are authorized under this general permit. Spills and Leaks - A list of significant spills and leaks of toxic or hazardous pollutants that occurred in areas exposed to storm water and that drain to storm water outfalls associated with concrete Page 5 of 7 concrete production at the facility, but must be a minimum of once per month while the facility is in operation. The inspection must take place while the facility is in operation and must, at a minimum, include all areas that are exposed to storm water at the site, including material handling areas, above ground storage tanks, hoppers or silos, dust collection/containment systems, truck wash down and equipment cleaning areas. Follow-up procedures must be used to ensure that appropriate actions are taken in response to the inspections. Records of inspections must be maintained and be made readily available for inspection upon request. Employee Training - An employee training program must be developed to educate personnel responsible for implementing any component of the SWP3, or personnel otherwise responsible for storm water pollution prevention, with the provisions of the SWP3. The frequency of training must be documented in the SWP3, and at a minimum, must consist of one training prior to the initiation of operation of the concrete batch plant. Record Keeping and Internal Reporting Procedures - A description of spills and similar incidents, plus additional information that is obtained regarding the quality and quantity of storm water discharges, must be included in the SWP3. Inspection and maintenance activities must be documented and records of those inspection and maintenance activities must be incorporated in the SWP3. Management of Runoff - The SWP3 shall contain a narrative consideration for reducing the volume of runoff from concrete batch plants by diverting runoff or otherwise managing runoff, including use of infiltration, detention ponds, retention ponds, or reusing of runoff. Comprehensive Compliance Evaluation - At least once per year, one or more qualified personnel (i.e., a person or persons with knowledge of this general permit, the concrete batch plant, and the SWP3 related to the concrete batch plant(s) for the site) shall conduct a compliance evaluation of the plant. The evaluation must include the following. Visual examination of all areas draining storm water associated with regulated concrete batch plants for evidence of, or the potential for, pollutants entering the drainage system. These include but are not limited to: cleaning areas, material handling areas, above ground storage tanks, hoppers or silos, dust collection/containment systems, and truck wash down and equipment cleaning areas. Measures implemented to reduce pollutants in runoff (including Page 7 of 7 Concrete Truck Wash Out Requirements This general permit authorizes the wash out of concrete trucks at construction sites regulated under Sections II.E.1., 2., and 3. of this general permit, provided the following requirements are met. Authorization is limited to the land disposal of wash out water from concrete trucks that are associated with off-site production facilities. Wash out water associated with on-site concrete production facilities must be authorized under a separate TCEQ general permit or individual permit. 1. Direct discharge of concrete truck wash out water to surface water in the state, including discharge to storm sewers, is prohibited by this general permit. 2. Concrete truck wash out water shall be discharged to areas at the construction site where structural controls have been established to prevent direct discharge to surface waters, or to areas that have a minimal slope that allow infiltration and filtering of wash out water to prevent direct discharge to surface waters. Structural controls may consist of temporary berms, temporary shallow pits, temporary storage tanks with slow rate release, or other reasonable measures to prevent runoff from the construction site. 3. Wash out of concrete trucks during rainfall events shall be minimized. The direct discharge of concrete truck wash out water is prohibited at all times, and the operator shall insure that its BMPs are sufficient to prevent the discharge of concrete truck washout as the result of rain. 4. The discharge of wash out water shall not cause or contribute to groundwater contamination. 5. If a SWP3 is required to be implemented, the SWP3 shall include concrete wash out areas on the associated map. BATCH PLANT MATERIAL MANAGEMENT Material management is important in that the best way to avoid a problem is prevention. On a construction site, the material storage area(s)can become a major source of risk due to possible mishandling of materials or accidental spills.An inventory of the material storage area the potential to come into contact with storm water. This will help raise your awareness and assist in planning effective controls. PETROLEUM PRODUCTS DATE IN/DATE OUT BATCH PLANT CHEMICALS(concrete hardeners and bagged concrete) HAZARDOUS PRODUCTS OTHER MATERIALS Pollution Prevention Team Team Member: Responsibilities: Team Member: Responsibilities: Team Member: Responsibilities: Team Member: Responsibilities: Team Member: Responsibilities: u, cr) L L as co a) a) L L co ca a) a) a C C 'c 'C 'co N) 'L C�) I— L cts O >_ O } a).. ) co c 0 0 N N L L CD a) a)) z O r = L L 0 CD CD CS) z i. ° a V 0 CD C •Q�, z° o 'Q. , z Co ) t ° �a y L ci N V. c .L s y a • a) -. N 0 W co()) O A '--d d y 0 O CL o Ili • C 0 a E co a) I- C y O V C a) v - C o Q y a a) t y a) L y d C 0. C d co V C e'') c • C � C a) 7 r L 'C 0 •� a) C) CL) Q. C C a1 Q .co- y 7 ~ E o •5 t .§. -5 a ~ d O C.) 0 O d co p Q C) 4-. d a) E w d O = y 0. 0. L Y a) O - E N O C C - y CD S N C) Q O . C R L O O L t O C) a 'i 0. ++ C� V a) E y V .4+ = v = = Q O N CD y C O 2 U) 0 Cl) V) d 0 m C7 m 0 co o Quarterly Visual Monitoring Form Fill out a separate form for each sample you collect(one form per outfall). Outfall number: Person colleting/examining sample: Quarter/year: Date&time collected: Date&time examined: Rainfall amount: Qualifying:Yes or No Runoff source:rainfall or snowmelt Parameter Parameter Description Parameter Characteristics Color Does the water appear to be colored? Describe: Yes No Clarity Is the water clear or transparent, Which of the following best describes the clarity of the water? meaning can you see through it?Yes Clear Milky Opaque Other(describe) No Oil sheen Can you see a rainbow effect or sheen Which of the following best describes the water sheen?Oily on the water surface?Yes No Silver Iridescent Odor Describe: Does the sample have an odor?Yes No Floating solids Describe: Is there something floating on the surface of the sample?Yes No Suspended solids Describe: Is there something suspended in the water column or sample?Yes No Settled solids Describe: Is there something settled at the bottom of the sample?Yes No Foam Describe: Is there foam or material forming on top of the water?Yes No Detail any concerns, corrective actions taken, and any other obvious indicators of pollution present in the sample: Collector's signature: C'. Co C 0 t. C w 0 Co V C < >. N` a) Co s O 0 i3 0 O• O a) Z C 0 L O '.- Cl) a a) V �" d C Q C% �r N _ C3. ti r a) U C tw : O 7 C .� LL cw 7 N O i v > a — = C O t; ,a; Z Co Q. = N 0 lL U L 0 .4+ V Co Q Cl) C • E C N aL> L • — 2 m 2 z C y+ - Co ti tu y C d N E - w O g O a N = co a) •0 N Gi W = Q O O r cC O O O v d d = A CO C C X *' v C 15 d . 0) m A p 0 C O CD CO •� N V N E L d E is 0 V ... C. N _ oc +� Co Co 0 0 0 C d y C of d = O E z 7 O E a) O _ _ d C i C •' M ,� 'C ++ O 'a •++ d h 61 N w O d N C d t — V Q R a7 . a N ? _ —' c-/ 3 '8 L co Co y ' — — — — C a .= Eccnn Q E d Q E axis R a ccoV 3 CC .1:1 E m Annual Comprehensive Compliance Narrative discussion of compliance with the current SWP3: Annual Comprehensive Compliance Revision of the SWP3? SWP3 Updated Element Yes No N/A Any additional elements (e.g. structural controls or BMPs)that should be added or modified for prevention of pollution The site map The inventory of exposed materials The description of good housekeeping measures The description of nonstructural controls Any other elements of the plan that were found to be inaccurate or that will be modified Signature: Date: Non-Storm Water Discharges Approved Non-Storm Water Discharges Type of Discharge Process or Activity Narrative Description of Non-Storm Water Discharge Investigation: Non-Storm Water Discharge Investigation Date Findings Corrective Action Taken Certification: I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system,or those persons directly responsible for gathering the information,the information submitted is to the best of my knowledge and belief,true,accurate,and complete. I am aware there are significant penalties for submitting false information,including the possibility of fines and imprisonment for knowing violations. Signature: Title: Date: Q O 1.41 E., w C 0 w N I-- cp O Y W O oo N U N o N O O W LL Y W a z CC a w ^ C N 2 o C R Z W W m 2 m F F 2 z O Z w Z W ~ E Z o a f m o a f v d m Z N O d N Q � > r a z g z o m w w w o 2 z O Z O W n z K 0O U i LU 0 0 2 y Q a < h K F W 4 J > K a = a a i lo z cr y a E W O < H w N r I- 0 ce O o a a ▪ w ° s z CC 0 Z L "9- w z w z a _I a w R' U' c E"E (9 O Z EAgEa Fe = w O 0 OF F „s a 5 2 Z Z 0 TES-F1 < (7 2 .44;4 n a U > za d� p CO < m E `o g'.Z ° ° ° x < W )FC E _ rE Z = 0 F °E m s N F a ?Wrap iv N W Q £v N w m E E m_ d a. CQ7 -„a£ or E K K £v m a t < w 3,£m�E } a mg _ A iIIfluI C a F- F F I- Y- F F .§E.81,2 w a N Z Z Z Z Z Z : .Z �z`0-7 N N W W W W W _ W W W W W W W W W dv C O. `L W a 2 W a 2 W a f W d a W a a W a f W m C a 2 a. K 2 a :z 2 w z 2 ce re 2 a`:s 2 K rc y a p < W5 a W:= a LU 5 a W 5 a W 7 a W:.= 7al W 5 O W d.Q aQ aQ dQ aQ aQ dQ J W J 0 O ti Z , Y m O Z 3 U W a O ] LL Li F U U w Z a W i . m u F m w a CC a n, W t. a Z o w 2Q z °w a o G K K 1- X ce a a a w a w a - Z o a M 1 W z z W Z E y O U F• w ce w Q Z LL a• Z a LL OJ U W ca E C C C c a) . a) . a) . a) . a) . — 3.. F 3.. co 3 •• F 3 .. F 3.. F CU Of C) w CO C) a) Co C) m CO 8) d c6 a1 d Cl) (7c a 0c a a E a a co E 'cam R ccoo E ca a) ccoo ccoo E 5 a`6) co co C .E co a) co co C Ws m CU E 0 R ax 00 P WM 00 P WM m0 P WW 00 F= WW m Cu c c c c c 0 a) Y N Y co . a) . a) co •L 3 F- 3 1— 7 F- 3 F 7 I- LL of • d f6 • d c6 C) a) co °) y CO C) d c 63 c 0 c c 0 c a a a a a CU € �• m (C CC a 'co- al CUC E 'co- 'al CCU E 'co- cm € 5m cC 0 R a M m0 P w w 00 P w W m0 P WW m0 P WW m OA CD >+ .• RS -C c c c c c Z i d . d . d . d . a7 Y = 3•. CO 3 .. CO 3 .. F-CZ 3 •• F- 3 .. I- .. :1:: = M M d CO C) a) CO d CO d CO m _N 0 c 0. 0 c Q .. (7c °- .. (.5,•5 C. 0c 0.•O CO) R R 8 'com CUR 8 Rm RR E 'cam c(oc�6 'cam cCaco a 'cam CU cJ ,J LL P P m 0 i- W W m0 F- WW m0 F- Wed m co "O N c c c c c E 0 N . a) . a) . a) . a) Y C Of CO CO OS C) CO C) a) CO l6 .0 73 0 C) I— co C) I— N W I— 0 C) F R co I- O 0 w co O (9c o 0 a .. C7c Q .. C C�c a co m ccoo co £ A co as m a co co co cco E cam ccoo R 'cod caa 0 0 P w ce m0 P W M m0 P WW m0 P WW m0 P MM m 4 C OA ce 0 C3 r et E E c c c .fir' d C) R 0) CU a) R C) co a) CU a � � d � � � � d CU d mM i 1— 0c .= 0c 0. 0c a .. 0c a 0c a 0 m E 'cod Rccl E 'cam (CCC E Am c£om E '5OC cCUA E Rm m >- 0 F- WW CO 0 P Wee m0 P WW m0 F- Wm 00 F- WM m a Cu c c E E c C a) forD CD O 7• F- F- 7 F- 7 F- 3 F- C CO C) d CO C a) co C) N co d d C ('C C7 C Ve C 0 C C7 C C E 'co- cm £ � m (CCC E Rm coa £ Cm (Cc 5m co 0 F- WW m0 P WW m0 P WW CO 0 F- WW 00 F- WW m a Cu c c c c c m a) m a) m C CD 3 F 3 F CO F 3 F F .0 w l6 0) d CO CO N CO C) a) CO CO d CO C) d C7 c .. 0c a C7c a 0c a CD a 0 v £ 'co m CO � E 'co co A m £ R m c£6 CU 5. £ 'c o a) R COO 'e 6 m CU 22 0 F- ace CO 0 P WW m0 P WW m0 F- WW m0 P WW m Appendix N Spill Prevention and Response Procedures, Contact Numbers and Spill Response Forms Spill Prevention and Response Procedures -Areas where potential spills that can contribute pollutants to storm water runoff, and the drainage areas from these locations, must be identified in the SWP3. Where appropriate, the SWP3 must specify material handling procedures, storage requirements, and use of equipment. Procedures for cleaning up spills must be identified in the SWP3 and made available to the appropriate personnel. SPILL PREVENTION AND RESPONSE Consistent with the general permit requirements, all potential pollutants will be handled and disposed of in a manner that does not cause contamination of storm water. Non-sediment pollutants that may be present during construction activities include: • Petroleum products including fuel, lubricants, hydraulic fluids, and form oils • Polymer used for soil stabilization • Water treatment chemicals(coagulant, acid, sodium bicarbonate) • Concrete • Paints • Fertilizers These materials, and other materials used during construction with the potential to impact storm water, will be stored, managed, used, and disposed of in a manner that minimizes the potential for releases to the environment and especially into storm water. Emergency contacts fort the project are included at the end of this section. General Materials Handling Practices The following general practices will be used throughout the project to reduce the potential for spills. • Potential pollutants will be stored and used in a manner consistent with the manufacturer's instructions in a secure location. To the extent practicable, material storage areas should not be located near storm drain inlets and should be equipped with covers, roofs, or secondary containment as needed to prevent storm water from contacting stored materials. Chemicals that are not compatible (such as sodium bicarbonate and hydrochloric acid) shall be stored in segregated areas so that spilled materials cannot combine and react. • Materials disposal will be in accordance with the manufacturer's instructions and applicable local, state, and federal regulations. • Materials no longer required for construction will be removed from the site as soon as practicable. • Adequate garbage, construction waste, and sanitary waste handling and disposal facilities will be provided to the extent necessary to keep the site clear of obstruction and BMPs clear and functional. Specific Materials Handling Practices • All pollutants, including waste materials and demolition debris, that occur on-site during construction will be handled in a way that does not contaminate storm water. • All chemicals including liquid products, petroleum products, water treatment chemicals, and wastes stored on site will be covered and contained and protected from vandalism. • Maintenance and repair of all equipment and vehicles involving oil changes, hydraulic system drain down, de-greasing operations, fuel tank drain down and removal, and other activities which may result in the accidental release of contaminants, will be conducted under cover during wet weather and on an impervious surface to prevent the release of contaminants onto the ground. Materials spilled during maintenance operations will be cleaned up immediately and properly disposed of. • Wheel wash water will be settled and discharged on site by infiltration. Wheel wash water will not be discharged to the storm water system or the storm water treatment system. • Application of agricultural chemicals, including fertilizers and pesticides, will be conducted in a manner and at application rates that will not result in loss of chemical to storm water runoff. Manufacturers' recommendations will be followed for application rates and procedures. • pH-modifying sources will be managed to prevent contamination of runoff and storm water collected on site. The most common sources of pH-modifying materials are bulk cement, cement kiln dust(CKD), fly ash, new concrete washing and curing waters, waste streams generated from concrete grinding and sawing, exposed aggregate processes, and concrete pumping and mixer washout waters. Spill Response The primary objective in responding to a spill is to quickly contain the material(s) and prevent or minimize their migration into storm water runoff and conveyance systems. If the release has impacted on-site storm water, it is critical to contain the released materials on site and prevent their release into receiving waters. If a spill of pollutants threatens storm water at the site, the spill response procedures outlined below must be implemented in a timely manner to prevent the release of pollutants. • The site superintendent will be notified immediately when a spill, or the threat of a spill, is observed. The superintendent will assess the situation and determine the appropriate response. • If spills represent an imminent threat of escaping project site and entering the receiving waters, facility personnel will respond immediately to contain the release and notify the superintendent after the situation has been stabilized. • If oil sheen is observed on surface water (e.g.,settling ponds, detention pond, and swales), absorbent pads and/or booms will be applied to contain and remove the oil. The source of the oil sheen will also be identified and removed or repaired as necessary to prevent further releases. • The site superintendent, or his designee, will be responsible for completing the spill reporting form and for reporting the spill to the appropriate state or local agency (see Forms at the end of this section). Notification In the event of a spill, make the appropriate notification(s)consistent with the following procedures: • Any spill of oil which 1)violates water quality standards, 2) produces a "sheen" on a surface water, or 3)causes a sludge or emulsion must be reported immediately by telephone to the National Response Center Hotline. • Any oil, hazardous substance, or hazardous waste release which exceeds the reportable quantity *see below for reference* must be reported immediately by telephone to the National Response Center Hotline. • Any spill of oil or hazardous substance to waters of the state must be reported immediately by telephone to the EPA National Response Center. I Reportable Quantities Quick Reference Material Released to Reportable Quantity Engine Oil, Fuel Hydraulic and Brake Fluid Land /Water 25 Gallons Visible Sheen Battery Acid Antifreeze Gasoline Engine Degreasers Air/ Land /Water 100 lbs Refrigerant Air 1 lb I SPILL RESPONSE CONTACT NUMBERS: I EPA NATIONAL RESPONSE CENTER (800) 424-8802 TEXAS COMMISSION ON ENVIRONMENTAL QUALITY(TCEQ) STATE OF TEXAS SPILL-REPORTING HOTLINE (800) 832-8224 Spill Report Form LOCATION OF SPILL AT PROJECT: Date: Time: Regulatory agencies notified(date, time, person,agency, and how): Material spilled: Quantity spilled: Source: Cause: Extent of injuries(if any): Immediate remedial actions taken at time of spill: Measures taken or planned to prevent recurrence: Was Storm Water Pollution Prevention Plan "SWPPP" Updated: Was Erosion Control Plan updated to show Spill Location: This report prepared by: (Signature) (Date) (Job title) Appendix 0 Definitions Definitions Arid Areas-Areas with an average annual rainfall of 0 to 10 inches. Best Management Practices (BMPs) - Schedules of activities, prohibitions of practices, maintenance procedures, structural controls, local ordinances, and other management practices to prevent or reduce the discharge of pollutants. BMPs also include treatment requirements, operating procedures, and practices to control construction site runoff, spills or leaks, waste disposal, or drainage from raw material storage areas. Commencement of Construction - The initial disturbance of soils associated with clearing, grading, or excavation activities, as well as other construction-related activities (e.g., stockpiling of fill material, demolition) Common Plan of Development - A construction activity that is completed in separate stages, separate phases, or in combination with other construction activities. A common plan of development (also known as a"common plan of development or sale") is identified by the documentation for the construction project that identifies the scope of the project, and may include plats, blueprints, marketing plans, contracts, building permits, a public notice or hearing, zoning requests, or other similar documentation and activities. A common plan of development does not necessarily include all construction projects within the jurisdiction of a public entity (e.g., a city or university). Construction of roads or buildings in different parts of the jurisdiction would be considered separate "common plans,"with only the interconnected parts of a project being considered part of a "common plan" (e.g., a building and its associated parking lot and driveways, airport runway and associated taxiways, a building complex, etc.). Where discrete construction projects occur within a larger common plan of development or sale but are located 1/4 mile or more apart, and the area between the projects is not being disturbed, each individual project can be treated as a separate plan of development or sale, provided that any interconnecting road, pipeline or utility project that is part of the same"common plan"is not included in the area to be disturbed. Discharge-For the purposes of this permit, the drainage, release, or disposal of pollutants in storm water and certain non-storm water from areas where soil disturbing activities(e.g., clearing, grading, excavation, stockpiling of fill material, and demolition), construction materials or equipment storage or maintenance (e.g., fill piles, borrow area, concrete truck washout, fueling), or other industrial storm water directly related to the construction process(e.g., concrete or asphalt batch plants)are located. Edwards Aquifer - As defined under Texas Administrative Code § 213.3 of this title (relating to the Edwards Aquifer), that portion of an arcuate belt of porous, water-bearing, predominantly carbonate rocks known as the Edwards and Associated Limestone's in the Balcones Fault Zone trending from west to east to northeast in Kinney, Uvalde, Medina, Bexar, Comal, Hays, Travis, and Williamson Counties; and composed of the Salmon Peak Limestone, McKnight Formation, West Nueces Formation, Devil's River Limestone, Person Formation, Kainer Formation, Edwards Formation, and Georgetown Formation. The permeable aquifer units generally overlie the less-permeable Glen Rose Formation to the south, overlie the less-permeable Comanche Peak and Walnut Formations north of the Colorado River, and underlie the less-permeable Del Rio Clay regionally. Edwards Aquifer Recharge Zone - Generally, that area where the stratigraphic units constituting the Edwards Aquifer crop out, including the outcrops of other geologic formations in proximity to the Edwards Aquifer, where caves, sinkholes, faults, fractures, or other permeable features would create a potential for recharge of surface waters into the Edwards Aquifer. The recharge zone is identified as that area designated as such on official maps located in the offices of the Texas Commission on Environmental Quality and the appropriate regional office. The Edwards Aquifer Map Viewer, located at http://www.tceq.state.tx.us/compliance/field ops/eapp/mapdisclaimer.html, can be used to determine where the recharge zone is located. Brock Environmental Services, LLC March 2013 Edwards Aquifer Contributing Zone - The area or watershed where runoff from precipitation flows down gradient to the recharge zone of the Edwards Aquifer. The contributing zone is located upstream (up gradient) and generally north and northwest of the recharge zone for the following counties: all areas within Kinney County, except the area within the watershed draining to Segment 2304 of the Rio Grande Basin; all areas within Uvalde, Medina, Bexar, and Comal Counties; all areas within Hays and Travis Counties, except the area within the watersheds draining to the Colorado River above a point 1.3 miles upstream from Tom Miller Dam, Lake Austin at the confluence of Barrow Brook Cove, Segment 1403 of the Colorado River Basin; and all areas within Williamson County, except the area within the watersheds draining to the Lampasas River above the dam at Stillhouse Hollow reservoir, Segment 1216 of the Brazos River Basin. The contributing zone is illustrated on the Edwards Aquifer map viewer at http://www.tceq.state.tx.us/compliance/field ops/eapp/mapdisclaimer.html. Facility or Activity- For the purpose of this permit, a construction site or construction support activity that is regulated under this general permit, including all contiguous land and fixtures(e.g., ponds and materials stockpiles), structures, or appurtances used at a construction site or industrial site described by this general permit. Final Stabilization-A construction site status where any of the following conditions are met: (a) All soil disturbing activities at the site have been completed and a uniform (i.e., evenly distributed, without large bare areas) perennial vegetative cover with a density of at least 70% of the native background vegetative cover for the area has been established on all unpaved areas and areas not covered by permanent structures, or equivalent permanent stabilization measures (such as the use of riprap, gabions, or geotextiles) have been employed. (b) For individual lots in a residential construction site by either: (1) The homebuilder completing final stabilization as specified in condition (a)above; or (2) The homebuilder establishing temporary stabilization for an individual lot prior to the time of transfer of the ownership of the home to the buyer and after informing the homeowner of the need for, and benefits of, final stabilization. If temporary stabilization is not feasible, then the homebuilder may fulfill this requirement by retaining perimeter controls or other best management practices, and informing the homeowner of the need for removal of temporary controls and the establishment of final stabilization. (c) For construction activities on land used for agricultural purposes (e.g. pipelines across crop or range land), final stabilization may be accomplished by returning the disturbed land to its preconstruction agricultural use. Areas disturbed that were not previously used for agricultural activities, such as buffer strips immediately adjacent to surface water and areas that are not being returned to their preconstruction agricultural use must meet the final stabilization conditions of condition (a)above. (d) In arid, semi-arid, and drought-stricken areas only, all soil disturbing activities at the site have been completed and both of the following criteria have been met: (1) Temporary erosion control measures (e.g., degradable rolled erosion control product) are selected, designed, and installed along with an appropriate seed base to provide erosion control for at least three years without active maintenance by the operator, and (2) The temporary erosion control measures are selected, designed, and installed to achieve 70 percent vegetative coverage within three years. Hyperchlorination of Waterlines - Treatment of potable water lines or tanks with chlorine for disinfection purposes, typically following repair or partial replacement of the waterline or tank, and subsequently flushing the contents. Brock Environmental Services, LLC March 2013 Indian Country Land-(from 40 CFR 122.2) (1) all land within the limits of any Indian reservation under the jurisdiction of the United States government, notwithstanding the issuance of any patent, and, including rights-of-way running through the reservation; (2) all dependent Indian communities with the borders of the United States whether within the originally or subsequently acquired territory thereof, and whether within or without the limits of a state; and (3)all Indian allotments, the Indian titles to which have not been extinguished, including rights-of-way running through the same. Indian Tribe - (from 40 CFR 122.2) any Indian Tribe, band, group, or community recognized by the Secretary of the Interior and exercising governmental authority over a Federal Indian Reservation. Large Construction Activity-Construction activities including clearing, grading, and excavating that result in land disturbance of equal to or greater than five (5) acres of land. Large construction activity also includes the disturbance of less than five (5) acres of total land area that is part of a larger common plan of development or sale if the larger common plan will ultimately disturb equal to or greater than five (5) acres of land. Large construction activity does not include routine maintenance that is performed to maintain the original line and grade, hydraulic capacity, or original purpose of the site (e.g., the routine grading of existing dirt roads, asphalt overlays of existing roads, the routine clearing of existing right-of- ways, and similar maintenance activities.) Municipal Separate Storm Sewer System (MS4) -A separate storm sewer system owned or operated by the United States, a state, city, town, county, district, association, or other public body (created by or pursuant to state law) having jurisdiction over the disposal of sewage, industrial wastes, storm water, or other wastes, including special districts under state law such as a sewer district, flood control or drainage district, or similar entity, or an Indian tribe or an authorized Indian tribal organization, that discharges to surface water in the state. Notice of Change(NOC)-Written notification to the executive director from a discharger authorized under this permit, providing changes to information that was previously provided to the agency in a notice of intent form. Notice of Intent (NOI) - A written submission to the executive director from an applicant requesting coverage under this general permit. Notice of Termination (NOT)-A written submission to the executive director from a discharger authorized under a general permit requesting termination of coverage. Operator - The person or persons associated with a large or small construction activity that is either a primary or secondary operator as defined below: Primary Operator-the person or persons associated with a large or small construction activity that meets either of the following two criteria: (a) The person or persons have operational control over construction plans and specifications, including the ability to make modifications to those plans and specifications; or (b) The person or persons have day-to-day operational control of those activities at a construction site that are necessary to ensure compliance with a storm water pollution prevention plan (SWP3)for the site or other permit conditions(e.g., they are authorized to direct workers at a site to carry out activities required by the SWP3 or comply with other permit conditions). Secondary Operator - The person whose operational control is limited to the employment of other operators or to the ability to approve or disapprove changes to plans and specifications. A secondary operator is also defined as a primary operator and must comply with the permit requirements for primary operators if there are no other operators at the construction site. Brock Environmental Services, LLC March 2013 Outfall - For the purpose of this permit, a point source at the point where storm water runoff associated with construction activity discharges to surface water in the state and does not include open conveyances connecting two municipal separate storm sewers, or pipes, tunnels, or other conveyances that connect segments of the same stream or other water of the U.S. and are used to convey waters of the U.S. Permittee -An operator authorized under this general permit. The authorization may be gained through submission of a notice of intent, by waiver, or by meeting the requirements for automatic coverage to discharge storm water runoff and certain non-storm water discharges. Point Source - (from 40 CFR §122.2) Any discernible, confined, and discrete conveyance, including but not limited to, any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock concentrated animal feeding operation, landfill leachate collection system, vessel or other floating craft from which pollutants are, or may be, discharged. This term does not include return flows from irrigated agriculture or agricultural storm water runoff. Pollutant - Dredged spoil, solid waste, incinerator residue, sewage, garbage, sewage sludge, filter backwash, munitions, chemical wastes, biological materials, radioactive materials, heat, wrecked or discarded equipment, rock, sand, cellar dirt, and industrial, municipal, and agricultural waste discharged into any surface water in the state. The term "pollutant" does not include tail water or runoff water from irrigation or rainwater runoff from cultivated or uncultivated rangeland, pastureland, and farmland. For the purpose of this permit,the term"pollutant"includes sediment. Pollution - (from Texas Water Code §26.001(14)) The alteration of the physical, thermal, chemical, or biological quality of, or the contamination of, any surface water in the state that renders the water harmful, detrimental, or injurious to humans, animal life, vegetation, or property or to public health, safety, or welfare, or impairs the usefulness or the public enjoyment of the water for any lawful or reasonable purpose. Rainfall Erosivity Factor(R factor)-the total annual erosive potential that is due to climatic effects, and is part of the Revised Universal Soil Loss Equation(RUSLE). Semiarid Areas-areas with an average annual rainfall of 10 to 20 inches Separate Storm Sewer System - A conveyance or system of conveyances (including roads with drainage systems, streets, catch basins, curbs, gutters, ditches, man-made channels, or storm drains), designed or used for collecting or conveying storm water; that is not a combined sewer, and that is not part of a publicly owned treatment works (POTW). Small Construction Activity- Construction activities including clearing, grading, and excavating that result in land disturbance of equal to or greater than one (1) acre and less than five (5) acres of land. Small construction activity also includes the disturbance of less than one(1) acre of total land area that is part of a larger common plan of development or sale if the larger common plan will ultimately disturb equal to or greater than one (1) and less than five (5) acres of land. Small construction activity does not include routine maintenance that is performed to maintain the original line and grade, hydraulic capacity, or original purpose of the site (e.g., the routine grading of existing dirt roads, asphalt overlays of existing roads,the routine clearing of existing right-of-ways, and similar maintenance activities.) Storm Water(or Storm Water Runoff)-Rainfall runoff, snow melt runoff, and surface runoff and drainage. Storm Water Associated with Construction Activity-Storm water runoff from a construction activity where soil disturbing activities (including clearing, grading, excavating) result in the disturbance of one (1) or more acres of total land area, or are part of a larger common plan of development or sale that will result in disturbance of one(1)or more acres of total land area. Structural Control (or Practice)-A pollution prevention practice that requires the construction of a device, or the use of a device, to capture or prevent pollution in storm water runoff. Structural controls and practices may include but are not limited to: silt fences, earthen dikes, drainage swales, sediment traps, check dams, subsurface drains, storm drain inlet protection, rock outlet protection, reinforced soil retaining systems, gabions, and temporary or permanent sediment basins. Brock Environmental Services, LLC March 2013 Surface Water in the State- Lakes, bays, ponds, impounding reservoirs, springs, rivers, streams, creeks, estuaries, wetlands, marshes, inlets, canals, the Gulf of Mexico inside the territorial limits of the state (from the mean high water mark (MHWM) out 10.36 miles into the Gulf), and all other bodies of surface water, natural or artificial, inland or coastal, fresh or salt, navigable or non-navigable, and including the beds and banks of all water-courses and bodies of surface water, that are wholly or partially inside or bordering the state or subject to the jurisdiction of the state; except that waters in treatment systems which are authorized by state or federal law, regulation, or permit, and which are created for the purpose of waste treatment are not considered to be water in the state. Temporary Stabilization - A condition where exposed soils or disturbed areas are provided a protective cover or other structural control to prevent the migration of pollutants. Temporary stabilization may include temporary seeding, geotextiles, mulches, and other techniques to reduce or eliminate erosion until either permanent stabilization can be achieved or until further construction activities take place. Waters of the United States- (from 40 CFR, Part122, Section 2) Waters of the United States or waters of the U.S. means: (a) All waters which are currently used, were used in the past, or may be susceptible to use in interstate or foreign commerce, including all waters which are subject to the ebb and flow of the tide; (b) All interstate waters, including interstate wetlands; (c) All other waters such as intrastate lakes, rivers, streams (including intermittent streams), mudflats, sandflats, wetlands, sloughs, prairie potholes, wet meadows, playa lakes, or natural ponds that the use, degradation, or destruction of which would affect or could affect interstate or foreign commerce including any such waters: (1) Which are or could be used by interstate or foreign travelers for recreational or other purposes; (2) from which fish or shellfish are or could be taken and sold in interstate or foreign commerce; or (3) Which are used or could be used for industrial purposes by industries in interstate commerce; (d) All impoundments of waters otherwise defined as waters of the United States under this definition; (e) Tributaries of waters identified in paragraphs(a)through (d)of this definition; (f) The territorial sea;and (g) Wetlands adjacent to waters (other than waters that are themselves wetlands) identified in paragraphs(a)through (f)of this definition. Waste treatment systems, including treatment ponds or lagoons designed to meet the requirements of CWA (other than cooling ponds as defined in 40 CFR '423.11(m) which also meet the criteria of this definition)are not waters of the United States. This exclusion applies only to manmade bodies of water which neither were originally created in waters of the United States (such as disposal area in wetlands) nor resulted from the impoundment of waters of the United States. Waters of the United States do not include prior converted cropland. Notwithstanding the determination of an area=s status as prior converted cropland by any other federal agency,for the purposes of the Clean Water Act, the final authority regarding Clean Water Act jurisdiction remains with EPA. Brock Environmental Services, LLC March 2013