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Gateway BP(2.5)-PT130913 (2)
Storm Water Pollution Prevention Plan ( SWPPP) for construction activities associated with Corporate HQ Coppell, Texas 75034 prepared May 2013 by Don Wims President of SWPPP INSPECTIONS, INC. Owner (Secondary Operator): SFPLP Holdings Management LLC 1200 Lakeside Parkway Flower Mound, TX 75028 GC (Primary Operator): DUKE CONSTRUCTION LIMITED PARTNERSHIP (DUKE) 14241 N. Dallas Pkwy., Suite 1000 Dallas, TX 75254 Table of Contents page I. Introduction ......................................................... ............................... 3 H. Authorization to Discharge ...................................... ............................... 4 III. Site Description ..................................................... ............................... 5 IV. Controls/ BMPs ...................................................... ............................... 6 V. Construction and Waste Materials ............................. ............................... 14 VI. Spills .................................................................. ............................... 15 VII. Inspections and Maintenance .................................... ............................... 18 VIII. Records ............................................................... ............................... 20 IX. Procedural Requirements ......................................... ............................... 21 X. Reference and Hotline ............................................ ............................... 23 Anvendix TPDES General Permit (NO. TXR150000) Construction Controls from NCTCOG's iSWM Technical Manual Notice of Intent (NOI), Permit, and Notice of Termination (NOT) Construction Site Notices (CSNs) Proof of Submittals to MS4 Operator Certification & Subcontractor Certification Duly Authorized Representative Soil Data, Reportable Quantities & Release Detail Sheet Operator Form, Actions Taken Form, & Constructon Schedule — complete and retain with SWPPP Location Map & Site Map *post the CSNs at the front entrance of the site readily available for viewing M I. Introduction The purpose of this Storm Water Pollution Prevention Plan (SWPPP) is to provide conditions for this construction site to discharge storm water to surface water in the state. It is the responsibility of DUKE to acquire property rights as may be necessary to use the discharge route. The goal is to prevent 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 and to prevent soil and pollutants of concern including sediment or a parameter that addresses sediment (such as total suspended solids, turbidity, or siltation) and any other pollutant that has been identified as a cause of impairment of a receiving water body that originate on site from flowing into Waters of the United States and to municipal separate storm sewer systems (MS4s) operated by the State, cities, towns, counties, districts, associations, states, other public bodies, or the United States. Waters of the United States include interstate wetlands, 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. Tributaries of waters identified above and wetlands adjacent to waters above are also considered Waters of the U.S. This SWPPP is consistent with requirements specified in applicable sediment and erosion site plans or site pemuts, or storm water management site plans or site permits approved by federal, state, or local officials and will be updated as necessary to remain consistent with any changes applicable to protecting surface water resources in sediment erosion site plans or site pemlits, or storm water management site plans or site permits approved by state or local officials for which DUKE receives written notice. This SWPPP has been prepared in accordance with good engineering practices, and addresses all major activities known to disturb significant amounts of ground surface during construction. Erosion control or soil stabilization is the best way to retain soil and potential pollutants. Preserve existing vegetation and limit disturbance when possible. Stabilize and /or revegetate disturbed areas as soon as possible after grading or construction. The stormwater management controls included in this plan focus on providing adequate control of pollutant discharges with practical approaches that utilize readily available techniques, expertise, materials, and equipment. -3- II. Authorization to Discharge Under the provisions of Section 402 of the Clean Water Act and Section 26.040 of the Texas Water Code, Construction sites located in the state of Texas may discharge to surface water in the state only according to effluent limitations, monitoring requirements, and other conditions set forth in the Texas Pollutant Discharge Elimination System (TPDES) General Permit NO. TXR150000, as well as the rules of the Texas Commission on Environmental Quality (TCEQ), the laws of the State of Texas, and other orders of the TCEQ. Discharges eligible for authorization include discharges of storm water runoff from small and large construction activities, discharges of storm water associated with dedicated construction support activities located within one (1) mile from the boundary of the permitted site, various non -stone water discharges described in TXR150000, and concrete truck wash out. The TCEQ is the Permitting Authority for this discharge, as the site is not located on Indian Country lands and the construction activity is not associated with oil and gas exploration, development, production, or transportation by pipeline. Operators of new and ongoing construction on large and small sites will be authorized provided they develop a SWPPP, implement that plan prior to commencing construction activities, and provide a copy of the signed Notice of Intent (NOI) and/or appropriate Site Notice to the TCEQ and/or MS4 receiving the discharge and to any operator that has operational control over construction plans and specifications, including the ability to make modifications to those plans and specifications. Proof of submittals must be retained in the SWPPP. Individual operators at a site may develop separate SWPPPs that cover only their portion of the project, provided reference is made to the other operators at the site. Where there is more than one SWPPP for a site, permittees must coordinate to ensure that Best Management Practices (BMPs) and controls are consistent, and do not negate or impair the effectiveness of each other. Regardless of whether a single comprehensive SWPPP is developed, or separate SWPPPs are developed for each operator, it is the responsibility of each operator to ensure that compliance with the terms and conditions of TXR150000 is met in the areas of the construction site where that operator has operational control over construction plans and specifications or day -to -day operational control. Operators of large and small sites must post the appropriate notices located where it is readily available for viewing by the general public, local, state, and federal authorities prior to commencing construction, and maintain the notice in that location until completion of the construction activity. TXR150000 and the authorization to discharge storm water shall expire at midnight, March 05, 2018. If the TCEQ publishes a notice of its intent to renew or amend TXR150000 before the expiration date, the permit will remain in effect for the discharges associated with this SWPPP until the commission takes final action on the permit. 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 permit, unless that permit provides for an alternative method for obtaining authorization. If the commission does not propose to reissue this general permit within 90 days before the expiration date, permittees shall apply for authorization under an individual permit or an alternative general permit. III. Site Description This Storm Water Pollution Prevention Plan ( SWPPP) has been prepared for construction activities associated with BMSC Naterra Corporate HQ in Coppell, Texas. All construction activities are being managed by DUKE. Nature of the construction activity: New construction of a 312,212 square foot professional office building including parking, utility construction, and all other related site improvements is the nature of the construction activity. Potential pollutants: sediment, trash, paint, fertilizers, hydrocarbons, lime, heavy metals, concrete, solvents, fuels, oils, grease, vehicle fluids, (misc. chemicals, curing compounds, adhesives) or other visible and non - visible pollutants are expected. Sources include construction and non - construction related personnel, soil, wash waters, storm water, construction equipment, misc. tools, vehicles, all compounds used by various subcontractors (paint, solvents, etc...). Intended schedule or sequence of activities that will disturb soils for the site: installation of erosion control, grading, excavation, utility installation, and backfilling activities. The total number of acres (to the nearest acre) of the entire property (this lot only) is 18 acres. The total number of acres (to the nearest acre) where construction activities will occur is 18 acres. Location and description of asphalt plants, concrete plants, and other support activites: A concrete batch plant may be utilized at this site. Contractor will be responsible for permitting and sampling. See Site Map for location and description of other support activities. The name of the receiving waters at or near the site that will receive discharges from disturbed areas of the project is Grapevine Creek. This SWPPP will serve as the SWPPP for the project as shown on the Site Map. There will be no offshe material storage areas. No post- construction storm water BMPs will be installed during the construction process to control pollutants in storm water discharges that will occur after construction operations have been complete. IV. ControlsBMPs Appropriate control measures and best management practices (BMPs) will be used to minimize pollution in runoff —and to prevent offsite sediment tracking. Erosion and sediment controls must be designed to retain sediment on -site to the extent practicable with consideration for local topography, soil type, and rainfall. Control measures must be properly selected, installed, and maintained according to the manufacturer's or designer's specifications. If inspections or other information indicates a control has been used incorrectly, or that the control is performing inadequately, the operator must replace or modify the control as soon as practicable after discovery that the control has been used incorrectly, is performing inadequately, or is damaged. Controls must be developed to limit, to the extent practicable, offsite transport of litter, and construction debris, and construction materials. Sediment controls will remove eroded soils from storm water runoff. Location and installation of controls should be determined by a common sense approach through a collective effort on the part of the following key personnel: DUKE, City of Coppell, SWPPP INSPECTIONS, INC., and all erosion control contractors —as well as adjacent property owners. Safety of all surrounding businesses, homeowners, and all vehicular traffic should be top priority when considering proper control measures. DUKE is the permittee responsible for installation and maintenance of control measures for each major soil disturbing activity. Controls to prevent off -site sediment tracking is a necessity. Areas for entering and exiting the site will be determined by DUKE prior to any construction activities. These areas will be continuously monitored and evaluated throughout construction to minimize off -site tracking. Dividend Drive, Freeport Pkwy, and Wrangler Drive should be monitored daily and will be cleaned as needed. Install inlet protection at the proposed inlets prior to the inlets becoming operational. Monitor daily to prevent ponding at inlets. See Site Map for the location of these controls. Future monitoring and site inspections will determine the necessity of additional controls; additional controls will be added by DUKE if necessary. Silt fence and inlet protection will be maintained by DUKE until construction is complete, all concrete /paving is finished, and permanent stabilization (70% native vegetation) has been established at remaining disturbed areas by DUKE. Silt fence and inlet protection will be removed by DUKE. _6- Stabilization Practices Stabilization measures must be initiated as soon as practicable in portions of the site where construction activities have temporarily or permanently ceased, and except as provided in (a) through (c) below, must be initiated no more than fourteen (14) days after the construction activity in that portion of the site has temporarily or permanently ceased. (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) Where construction activity on a portion of the site is temporarily ceased, and earth disturbing activities will be resumed within twenty-one (2 1) days, temporary erosion control and stabilization measures are not required on that portion of site. (c) In and areas (areas with an average rainfall of 0 to 10 inches), semiarid areas (areas with an average annual rainfall of 10 to 20 inches), and areas experiencing droughts where the initiation of stabilization measures by the 14th day after construction activity has temporarily or permanently ceased or is precluded by and conditions, stabilization measures must be initiated as soon as practicable. The following is a list of interim stabilization practices and a schedule for implementation: first protection of existing trees and vegetation where possible, then construction entrance, then geotextiles (silt fence) and erosion blankets (as needed), ...then, permanent stabilization practices and a schedule for implementation: first concrete placement for the slabs /fire lanes /turn lane /entrances /parking /sidewalks, then permanent vegetation will be established by sod installation and/or hydromulching. The Site Map shows locations of disturbed areas to be stabilized. The following records must be maintained and attached to the SWPPP: the dates when major grading activities occur, the dates when construction activities temporarily or permanently cease on a portion of the site, and the dates when stabilization measures are initiated. A form to log this information is included in this SWPPP. r�- Final Stabilization Final stabilization must be achieved prior to termination of permit coverage. Final stabilization means that either 1. All soil disturbing activities at the site have been completed and a uniform (e.g., evenly distributed, without large bare areas) perennial vegetative cover with a density of 70% of the native background 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. 2. For individual lots in residential construction by either: (a) The homebuilder completing final stabilization as specified above, or (b) 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. Establishing final stabilization in areas that are unpaved and /or without concrete is primarily achieved by vegetation or permanent landscaping. Sod: The type of sod to be installed should be determined and agreed on by all key personnel prior to installation. Sod typically is a more costly, but aesthetically pleasing means of soil stabilization Seeding: For this SWPPP, the term seeding means the establishment of perennial grass cover on disturbed areas by planting seed. The purpose is to protect the soil surface from erosion. Seed can be applied by broadcast, drilling, or hydromulching, according to site needs. The surface should be prepared and the seed applied according to seed supplier recommendations. The grass mixture below for temporary erosion control is taken from the iSWM Design Manual for Construction. SEASON J COMMON NAME MATE (LBS /ACRE) Aug 15 - Nov 30 Tall Fescue 4.0 Western Wheat Grass 5.0 Wheat (Red, Winter) 30.0 May 1 - Aug 31 Foxtail Millet 30.0 Feb 15 — May 31 Annual Rye 20.0 Sep 1 -Dec 31 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, and may also be used to control solids in storm water runoff for drainage locations serving less than ten (10) acres. 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. When calculating the volume of 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 are either undisturbed or have already undergone final stabilization, if these flows are diverted around both the disturbed areas of the site and the sediment basin. Where rainfall data is not available or a calculation cannot be performed, a temporary or permanent sediment basin providing at least 3,600 cubic feet of storage per acre drained may be provided. If a sedimentation basin is not feasible, then DUKE shall provide equivalent control measures, where attainable, until final stabilization of the site. In determining whether installing a sediment basin is feasible, DUKE 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. For sites with drainage areas of ten or more acres, DUKE 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. 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. Sediment must be removed from sediment traps and sedimentation ponds no later than the time that design capacity has been reduced by 50 %. A detention pond was not designed by the civil engineer for this site. See approved development plans from civil engineer for drainage calculations. Structural Practices The following is a description of structural control practices used to divert flows away from exposed soils, to limit the contact of runoff with disturbed areas, or to lessen the off -site transport of eroded soils. 1. silt fence 2. inlet protection 3. drainage swales See Site Map for locations of these structural practices. Exact locations for the structural controls implemented in this SWPPP are to be determined prior to construction on a given section. Details of such structural practices should conform to NCTCOG standards; however, such practices may be modified as necessary when to do so produces more satisfactory erosion and sediment control results. Safety should be the primary concern when selecting and installing all structural controls. Other Controls No permanent storm water controls will be installed during the construction process. Construction entrances, stabilization of soil (including temporary and permanent vegetation), and water trucks (as needed) will minimize off -site tracking of soils and the generation of dust. Velocity dissipation devices (riprap) (see Site Map) will not be needed at this site. Controls must be developed to limit the offsite transport of suspended sediments and other pollutants if it is necessary to pump or channel standing water from the site. Pump only discharges composed entirely of storm water. mills Material and Equipment Storage Areas: Prior to construction, material and equipment storage areas should be designated and located in a flat area so as not to drain to a water body or street. The location can be determined in the field. Chemicals, paints, solvents, fertilizers, and other toxic substances shall be stored in waterproof containers. Except during application, the containers shall be kept on trucks or within storage facilities. Equipment Maintenance: Equipment maintenance and repair should be performed in a flat area so as not to drain to a water body or street. Equipment wash down (except for wheel washes) shall take place within an earth berm. Use of detergents is discouraged. If utilized they shall be readily biodegradable. The location can be determined in the field. Waste Disposal: All solid waste materials, including disposable materials incidental to the major construction activities, will be collected in containers. The containers will be emptied periodically by contract trash disposal service and trucked away from the site. Sanitary Facilities: Sanitary facilities shall be provided at various locations throughout the site, utilized by construction personnel, and serviced by a commercial operator. Dust Control: During construction, water trucks will be used to reduce dust as needed. After construction, the site will be stabilized in order to reduce dust. Water Source: Water used to establish and maintain grass, for dust control, and for other purposes during the construction phase must originate from a public water supply or private well approved by the Texas State Health Department. Concrete Washout TXR150000 authorizes the wash out of concrete trucks at regulated construction sites, provided the following requirements are met: Direct discharge of concrete truck wash out water to surface water in the state, including discharge to stone sewers, is prohibited by this general permit. 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 measure to prevent ninoff from the construction site. Wash out of concrete trucks during rainfall events should be minimized. The discharge of wash out water shall not cause or contribute to groundwater contamination. The SWPPP shall include concrete wash out areas on the associated map. Guidelines for constructing concrete washout: 1. It should not be located near a creek, inlet, lake, or other water body. 2. If off -site tracking is a problem, a rock entrance that will eliminate tracking into streets during and after storm events should be utilized. 3. It should be a pit that will contain the washout on all four sides. The washout area should provide a minimum of 6 cubic feet of containment area volume for every 10 cubic yards of concrete poured. The pit will need to be pumped or the materials will need to be hauled off if the design capacity exceeds 50 %. Installing a concrete washout to meet these standards is required. The location can be determined in the field and will be reflected on the Site Map. Non -storm Water Discharges The following non -storm water discharges are authorized by TXR150000. The items at this site which are expected to combine with construction storm water discharges are in bold. 1. discharges from fire fighting 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) 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), where pressure washing is not conducted, and where the purpose is to remove mud, dirt, or dust 4. uncontaminated water used to control dust; 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); uncontaminated air conditioning condensate 5. uncontaminated ground water or spring water, including foundation or footing drains where flows are not contaminated with industrial materials such as solvents 6. lawn watering and similar irrigation drainage The existing controls and measures mentioned in this SWPPP and shown on the Site Map should be adequate to minimize pollutant discharges; however, the SWPPP inspector should be immediately notified if a fire occurs. Additional controls will be added if necessary. V. Construction and Waste Materials The following construction materials will be used and/or staged on site at various times during construction: silt fence (14g wire back , steel posts) acetylene & oxygen bottles pvc conduit structural & misc. steel pvc pipe, primer, & glue tarpaper lime stabilization materials framing lumber landscaping materials sheathing reinforcing steel & accessories misc. wood blocking & dunnage wood concrete forms .45 mil &.60 mil tpo roofing membrane 10 mil polyethylene vapor barrier roofing sealants post- tension cables roofing insulation bond breaker sheet metal flashing curing compound silicone and urethane caulking sealants 3000 psi & 4000 psi ready -mix concrete doors & frames non - shrink grout mix windows patchcrete mix sheetrock concrete hardener /sealer paint brick and stone texture cmu block gasoline, diesel, hydraulic oil mortar texture grease This list should be updated as appropriate. . 14- VI. Spills The following controls should be utilized, along with manufacturer recommendations, by all vendors and contractors as a GUIDELINE for onsite and offsite material management: debris and trash management, chemical management, concrete waste management, concrete sawcutting waste management, sandblasting waste management, lime stabilization management, and sanitary facilities. Proper containment is a necessity, with special attention to onsite fuel, oil, and chemical storage. Manufacturer requirements for storage, containment, clean -up, disposal, and recycling must be adhered to— WITHOUT EXCEPTION. A Spill Prevention, Control, and Countermeasure (SPCC) Plan must be designed if the total combined temporary storage is greater than 1,320 gallons. (Include operating equipment fuel tanks over 55 gallons in the calculation.) See the EPA's Final Rule concerning Oil Pollution Prevention and Response [40 CFR Part 1121. Small Spills The following steps should be followed to prevent storm water pollution and to protect our local waterways in the event of a spill on site: What should you do if there is a small spill? For cleanup of small scale spills, each subcontractor should consult the Material Safety Data Sheets (MSDS) (available from the manufacturer) for the chemicals involved in the spill. These data sheets provide relevant information for specific liquid types, and are available from chemical manufacturers and suppliers. The MSDS gives advice on handling, storage, and cleanup procedures for liquid chemicals. The following general procedures are recommended in the event of small emergency spills: 1. Consult the Material Safety Data Sheets (MSDS). 2. Stop the spill: Stop the source of the spill immediately, if it is safe to do so, in a way that is appropriate to the chemicals involved. This will reduce the level of possible contamination to the environment. 3. Contain the spill: Control the flow of the spill and contain the spill appropriate to the type of liquid involved. (Refer to the MSDS). Prevent the spill from entering any stormwater drains, by isolating drain inlets. 4. Clean up the spill: Clean up the spill by referring to the MSDS for the type of chemical involved. Cleaning up a spill promptly will help to protect the local environment. 5. Dispose of the Spill *: Dispose of the spill by referring to the MSDS for the type of chemical involved. Disposing of a spill promptly will help to protect the local environment. *The following is a company that specializes in providing clean -up, transportation, and disposal of hazardous, industrial, and waste materials. TAS Environmental www.taslp.com 888.654.0111 It is important to clean up all spills quickly —even small ones such as oil spills, as these can easily flow into storm drains or be washed there by rain. -16- Releases of Renortable Ouantities Due to the nature of construction activities, spills of hazardous materials or hydrocarbons are always a possibility. During a 24 hour period, when a release exceeds the Reportable Quantity (RQ) level as outlined in EPA regulations 40 CFR Part 110, 40 CFR Part 117, or 40 CFR Part 302, DUKE is required to due 2 things: (1) The permittee should call each of the following to report the spill: National Response Center ....................... ...................800.424.8802 TCEQ Hotline ...... ............................... ...................800.832.8224 City of Coppell Engineering .................... ...................972.304.3679 (2) Within 14 days of knowledge of the release, this SWPPP should be modified. The modification shall include a description of the release, the circumstances leading to the release, and the date of the release. This plan must be reviewed to identify measures to prevent the reoccurrence of such releases and to respond to such releases, and this plan must be modified where appropriate. The following is a company that specializes in providing clean -up, transportation, and disposal of hazardous, industrial, and waste materials. TAS Environmental www.tasip.com 888.654.0111 A list of Reportable Quantities and a Release Detail Sheet is included in this SWPPP. -17- VII. Inspections and Maintenance All erosion and sediment control measures and other protective measures identified in this SWPPP must be maintained in effective operating condition. If inspections determine that BMPs are not operating effectively, maintenance must be performed before the next anticipated storm event or as necessary to maintain the continued effectiveness of storm water controls. If maintenance prior to the next anticipated storm event is impracticable, 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 inspections or other information indicates a control has been used incorrectly, is performing inadequately, or is damaged, then DUKE must replace or modify the control as soon as practicable after making the discovery. 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 Personnel provided by the permitee and familiar with the SWPPP 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. Sediment and erosion control measures identified in the SWPPP 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. Inspections must be conducted at least once every fourteen (14) calendar days and within twenty four (24) hours of the end of a storm event of 0.5 inches or greater. Where sites have been finally or temporarily stabilized, where runoff is unlikely due to winter conditions (e.g. site is covered with snow, ice, or frozen ground exists), or during seasonal arid periods in arid areas (areas with an average annual rainfall of 0 to 10 inches) and semi -arid areas (areas with an average annual rainfall of 10 to 20 inches), inspections must be conducted at least once every month. As an alternative to the above - described inspection schedule of once every fourteen (14) calendar days and within twenty four (24) hours of a storm event of 0.5 inches or greater, the SWPPP may be developed to require that these inspections will occur at least once every seven (7) calendar days. If this alternative schedule is developed, the inspection must occur on a specifically defined day, regardless of whether or not there has been a rainfall event since the previous inspection. The SWPPP must be modified based on the results of inspections, as necessary, to better control pollutants in runoff. Revisions to the SWPPP must be completed within seven (7) calendar days following the inspection. If existing BMPs are modified or if additional B1V1Ps are necessary, an implementation schedule must be described in the SWPPP and wherever possible those changes implemented before the next storm event. If implementation before the next anticipated storm event is impracticable, these changes must be implemented as soon as practicable. -18- A report summarizing the scope of the inspection, names and qualifications of personnel making the inspection, the dates of the inspection, and major observations relating to the implementation of the SWPPP must be made and retained as part of the SWPPP. Major observations should include: the locations of discharges of sediment or other pollutants from the site; locations of BMPs that need to be maintained; locations of BMPs that failed to operate as designed or proved inadequate for a particular location; and locations where additional BMPs are needed. Actions taken as a result of inspections must be described within, and retained as a part of, the SWPPP. Reports must identify any incidents of noncompliance. Where a report does not identify any incidents of noncompliance, the report must contain a certification that the facility or site is in compliance with the SWPPP and this permit. The report must be signed by the person and in the manner required by 30 TAC § 305.128 (relating to Signatories to Reports). -19- VIII. Records DUKE shall retain a copy of the SWPPP, all reports and actions required by this permit, and all data used to complete the NOI for a period of at least three years from the date that a NOT is submitted. For activities that are not required to submit an NOT, records shall be retained for a minimum period of three (3) years from the date that either of the following conditions is met: (1) final stabilization has been achieved on all portions of the site that is the responsibility of the pennittee; or (2) another permitted operator has assumed control of areas of the site that have not been finally stabilized. This period may be extended by request ofthe Director at any time. The SWPPP 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 SWPPP. The SWPPP must be made readily available at the time of an on -site inspection to: the executive director; a federal, state, or local agency approving sediment and erosion plans, grading plans, or storm water management plans; local government officials; and the operator of a municipal separate storm sewer receiving discharges from the site. Operators of Large Construction sites must post the NOI and the site notice provided in Attachment 3 of TXR150000 near the main entrance of the construction site. Operators of Small Construction sites must post the site notice provided in Attachment 1 or 2 in order to obtain authorization. If the construction project is a linear construction project (e.g. pipeline or highway), the notice must be placed in a publicly accessible location near where construction is actively underway. Notice for these linear sites may be relocated, as necessary, along the length of the project. The notice must be readily available for viewing by the general public; local, state, and federal authorities. DUKE must furnish to the executive director, upon request and within a reasonable time, any information necessary for the executive director to determine whether cause exists for revoking, suspending, or terminating authorization under TXR150000. Additionally, DUKE must provide to the executive director, upon request, copies of all records that the permittee is required to maintain as a condition of TXR150000. All reports and other information requested by the executive director must be signed by the person and in the manner required by 30 TAC § 305.128 (relating to Signatories to Reports). -20- IX. Procedural Requirements DUKE must comply with the following requirements of the General Permit TXR150000: A. develop a SWPPP (this plan), according to the provisions of TXR15000, that covers either the entire site or all portions of the site for which DUKE is the operator, and implement that plan prior to commencing construction activities B. If a large site, submit the NOI, including appropriate Fees, using a form provided by the executive director, to the TCEQ and MS4. If a small site, submit the appropriate Site Notice to the MS4. Proof of submittals must be retained in the SWPPP. C. post a copy of the signed NOI and/or Site Notice at the construction site in a location where it is readily available for viewing prior to commencing construction activities, and maintain the notice in that location until completion of the construction activity D. The SWPPP 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 SWPPP. The SWPPP must be made readily available at the time of an on -site inspection to: the executive director; a federal, state, or local agency approving sediment and erosion plans, grading plans, or storm water management plans; local government officials; and the operator of a municipal separate storm sewer receiving discharges from the site. E. If DUKE becomes aware that it failed to submit any relevant facts, or submitted incorrect information in an NOI, the correct information must be provided to the executive director in a Notice of Change (NOC) Letter within 14 days after discovery. If relevant information provided in the NOI changes, a NOC letter must be submitted within 14 days of the change. A copy of the NOC must be provided to the operator of any MS4 receiving the discharge. Proof of submittals must be retained in the SWPPP. F. NOI Forms, Notice of Termination (NOT) Forms, NOC letters, and Construction Site Notices must be signed according to 30 TAC § 305.44 (relating to Signatories for Applications). G. All reports and other information requested by the executive director must be signed by the person and in the manner required by 30 TAC § 305.128 (relating to Signatories to Reports). H. Discharge of a hazardous substance or oil into water is subject to reporting requirements. I. The SWPPP must be updated as necessary to reflect 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 SWPPP. The SWPPP must also be updated whenever site conditions change based on updated plans and specifications, new operators, new areas of responsibility, and changes in BMWs. J. Erosion and sediment controls must be designed and inspected to retain sediment on -site to the extent practicable with consideration for local topography, soil type, and rainfall. All control measures must be property selected, installed, and maintained according to the manufacturer's or designer's specifications. K. If periodic inspections or other information indicates a control has been used incorrectly, is performing inadequately, or is damaged, then DUKE must replace or modify the control as soon as practicable after making the discovery. L. If sediment escapes the construction site, accumulations must be removed at a frequency that minimizes off -site impacts, and prior to the next rain event if feasible. M. Sediment must be removed from sediment traps or sedimentation ponds no later than the time that design capacity has been reduced by 50 %. N. Inspections must be conducted to assure compliance with this SWPPP. Actions taken as a result of inspections must be described within, and retained as a part of the SWPPP. O. The NOT must be submitted to the TCEQ, and a copy of the NOT provided to the operator of any MS4 receiving the discharge, within thirty (30) days, after final stabilization has been achieved on all portions of the site that is the responsibility of DUKE or all silt fences and other temporary erosion controls have either been removed, scheduled for removal as defined in the SWPPP, or transferred to a new operator provided that DUKE has attempted to notify the new operator in writing of the requirement to obtain permit coverage. Record of this notification (or attempt at notification) shall be retained by DUKE. P. This SWPPP, inspection reports, actions taken, required proof of submittals, and all other related documentation must be retained for at least three years from the date that this site achieves final stabilization. Q. Operator Form, Actions Taken Form, and Inspection Forms must be completed and maintained as part of the SWPPP. -22- X. Reference and Hotline The following information was utilized in creating this SWPPP: TPDES General Permit (NO. TXR150000) Clean Water Act Section 303(d) list Construction Controls from NCTCOG's iSWM Technical Manual Reportable Quantities from the EPA location map taken from Mapsco Questions regarding this SWPPP, the General Permit TXR150000, or any other storm water related concerns may be directed to: Don Wims President SWPPP INSPECTIONS, INC. ZSW P or contact the Texas Commission of Environmental Quality (TCEQ) at 512.239.1000. -23- Texas Commission on Environmental Quality P.O. Box 13087, Austin, Texas 78711 -3087 ,'A GENERAL PERMIT TO DISCHARGE UNDER THE TEXAS POLLUTANT DISCHARGE ELIMINATION SYSTEM under provisions of Section 402 of the Clean Water Act and Chapter 26 of the Texas Water Code This permit supersedes and replaces TPDES General Permit No. TXR1.50000, issued March 5, 2oo8 Construction sites that discharge stormwater associated with construction activity located in the state of Texas may discharge to surface water in the state only according to monitoring requirements and other conditions set forth in this general permit, as well as the rules of the Texas Commission on Environmental Quality (TCEQ or Commission), the laws of the State of Texas, and other orders of the Commission of the TCEQ. The issuance of this general permit does not grant to the permittee the right to use 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 any individual, partnership, corporation or other entity. Neither does this general permit authorize any invasion of personal rights nor any violation of federal, state, or local laws or regulations. It is the respohsibility of the permittee to acquire property rights as may be necessary to use the discharge route. This general permit and the authorization contained herein shall expire at midnight, five years from the permit effective date. EFFECTIVE DATE: March 5, 2013 ISSUED DATE: FEB ^19 2013 � j �, •� For mission Construction General Permit TPDES General Permit TXR150000 TPDES GENERAL PERMIT NUMBER TXR150000 RELATING TO STORMWATER DISCHARGES ASSOCIATED WITH CONSTRUCTION ACTIVITIES Table of Contents Part I. Flow Chart and Definitions ........................................................... ..............................5 Section A. Flow Chart to Determine Whether Coverage is Required . ..............................5 SectionB. Definitions .......................................................................... ..............................6 Part II. Permit Applicability and Coverage .............................................. .............................12 Section A. Discharges Eligible for Authorization ............................... .............................12 1. Stormwater Associated with Construction Activity ................... ............................... 12 2. Discharges of Stormwater Associated with Construction Support Activities ..........12 3. Nan - Stormwater Discharges .....................:................................. .............................12 4. Other Permitted Discharges ........................................................ .............................13 Section B. Concrete Truck Wash Out ................................................. .............................13 Section C. Limitations on Permit Coverage ....................................... .............................13 1. Post Construction Discharges ...................................................... .............................13 2. Prohibition of Non - Stormwater Discharges ................................ .............................13 3. Compliance With Water Quality Standards ................................ .............................13 4. Impaired Receiving Waters and Total Maximum Daily Load (TMDL) Requirements............................................................................... .............................14 5. Discharges to the Edwards Aquifer Recharge or Contributing Zone .......................14 6. Discharges to Specific Watersheds and Water Quality Areas ..... .............................14 7. Protection of Streams and Watersheds by Other Governmental Entities ................14 8. Indian Country Lands .................................................................. .............................14 9. Oil and Gas Production ................................................................ .............................15 lo. Stormwater Discharges from Agricultural Activities ................... .............................15 11. Endangered Species Act ............................................................... .............................15 12. Other .......................................................................................... ............................... 15 Section D. Deadlines for Obtaining Authorization to Discharge ....... .............................15 1. Large Construction Activities ...................................................... .............................15 2. Small Construction Activities ...................................................... .............................15 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 TXR150000 4. Waivers for Small Construction Activities: ............................................................... 18 5. Effective Date of Coverage ........................................................... .............................18 6. Notice of Change (NOC) .............................................................. .............................18 7. Signatory Requirement for NOI Forms, Notice of Termination (NOT) Forms, NOC Letters, and Construction Site Notices ........................................ .............................19 8. Contents of the NOI ..................................................................... .............................19 Section F. Terminating Coverage ....................................................... .............................20 1. Notice of Termination (NOT) Required ...................................... .............................20 2. Minimum Contents of the NOT ....................................... ............................... 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 andSpecifications ........................................................................ .............................25 4. Activities Extending Beyond the Waiver Period .......................... .............................22 2. Primary Operators with Day -to -Day Operational Control .......... .............................25 Section H. Alternative TPDES Permit Coverage ................................. .............................23 Section C. Deadlines for SWP3 Preparation, Implementation, and Compliance ........... 1. Individual Permit Alternative ...................................................... .............................23 Section D. Plan Review and Making Plans Available ......................... .............................26 2. Individual Permit Required ......................................................... .............................23 Section E. Revisions and Updates to SWP3s ..................................... .............................26 3. Alternative Discharge Authorization ........................................... .............................23 Section F. Contents of SWP3 ............................................................. .............................26 Section I. Permit Expiration .............................................................. .............................23 Section G. Erosion and Sediment Control Requirements Applicable to All Sites ........... Part III. Stormwater Pollution Prevention Plans (SWP3) ......................... .............................24 Part IV. Stormwater Runoff from Concrete Batch Plants ......................... .............................35 Section A. Shared SWP3 Development .............................................. .............................24 Section B. Responsibilities of Operators ............................................ .............................25 1. Secondary Operators and Primary Operators with Control Over Construction Plans andSpecifications ........................................................................ .............................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 Construction General Permit TPDES General Permit TXR150000 Part V. Concrete Truck Wash Out Requirements ................................. ............................... 40 Part VI. Retention of Records ................................................................. ............................... 40 Part VII. Standard Permit Conditions ..................................................... ............................... 40 PartVIII. Fees ..................................................................................... ............................... 41 Appendix A: Automatic Authorization ...................................................... .............................43 Appendix B: Erosivity Index (EI) Zones in Texas ...................................... .............................45 Appendix C: Isoerodent Map ..................................................................... .............................46 Appendix D: Erosivity Indices for EI Zones in Texas ................................ .............................47 Page 4 Construction General Permit TPDES General Permit TXR150000 Part 1. Flow Chart and Definitions Section A. Flow Chart to Determine Whether Coverage is Required How much land will be disturbed? (*1) < I acre I or more acres Permit Coyera?,g HCgM1rCd • Prepare and Implement SWP3 • Post Site Notice • Submit Copy of Site Notice to MS4 Operator Permit CoverylLN:ot Hjqglred, Unless Part of a Larger Common Plan of Development or Sale owill 5 or more - acres be disturbed? Eft: A-0 I YES Arc youa-primary operator?" (*2) ITKI Permit CoveM1gg_&UM1EKd • Prepare and Implement SWP3 • Submit NOI to TCEQ • Post Site Notice • Submit Copy of NOI to MS4 1) To derernsine the size of the construction project, use the sire of the entire area to be disturbed, and include the sire of the larger common plan of development or sale, if the project is part of a larger project (refer to Part LB., "Definitions, "for an explanation of "common plan of development or sale'). (1�2) Refer to the definitions for "operator, " "priarary operator, " and "secondarj, operator" in Part I., Section B. ofiMpermit Page 5 Construction General Permit TPDES General Permit TXR150000 Section B. Definitions Arid Areas - Areas with an average annual rainfall of o to io 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. Construction Activity - Includes soil disturbance activities, including clearing, grading, and excavating; and 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). Regulated construction activity is defined in terms of small and large construction activity. Dewatering — The act of draining rainwater or groundwater from building foundations, vaults, and trenches. Discharge — For the purposes of this permit, the drainage, release, or disposal of pollutants in stormwater and certain non - stormwater 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 wash out, fueling), or other industrial stormwater directly related to the construction process (e.g., concrete or asphalt batch plants) are located. Drought - Stricken Area — For the purposes of this permit, an area in which the National Oceanic and Atmospheric Administration's U.S. Seasonal Drought Outlook indicates for the 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.ci)c.neeT).noaa.cov /products /expert assessment /seasonal drouaht.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 6 Construction General Permit TPDES General Permit TXR150000 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 (TCEQ) and the appropriate regional office. The Edwards Aquifer Map Viewer, located at http://w,Aw.teeg.texas.gov/comT)Iiance/field ops /eapp /mapdisclaimer.html, can be used to determine where the recharge zone is located. Edwards Aquifer Contributing Zone - The area or watershed where runoff from precipitation flows downgradient to the recharge zone of the Edwards Aquifer. The contributing zone is located upstream (upgradient) 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 No. 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 No. 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 No. 1216 of the Brazos River Basin. The contributing zone is illustrated on the Edwards Aquifer map viewer at htti)://www.teeg.texas.gov/compliance/field ops /eapp /mapdisclaimer.html. Effluent Limitations Guideline (ELG) — Defined in 40 Code of Federal Regulations (CFR) § 122.2 as a regulation published by the Administrator under § 304(b) of the Clean Water Act (CWA) to adopt or revise effluent limitations. 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 (for example, 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 (that is, 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 BMPs, and informing the homeowner of the need for removal of temporary controls and the establishment of final stabilization. Page 7 Construction General Permit TPDES General Permit TXR150000 Fullfillment of this requirement must be documented in the homebuilder's stormwater pollution prevention plan (SWP3). C. For construction activities on land used for agricultural purposes (such as 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: (i) Temporary erosion control measures (for example, 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% of the native background 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. Impaired Water - A surface water body that is identified on the latest approved CWA §303(d) List as not meeting applicable state water quality standards. Impaired waters include waters with approved or established total maximum daily loads (TMDLs), and those where a TMDL has been proposed by TCEQ but has not yet been approved or established. 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 (for example, the routine grading of existing dirt roads, asphalt overlays of existing roads, the routine clearing of existing right -of -ways, and similar maintenance activities.) Linear Project — Includes the construction of roads, bridges, conduits, substructures, pipelines, sewer lines, towers, poles, cables, wires, connectors, switching, regulating and transforming equipment and associated ancillary facilities in a long, narrow area. Minimize - To reduce or eliminate to the extent achievable using stormwater controls that are technologically available and economically practicable and achievable in light of best industry practices. Page 8 Construction General Permit TPDES General Permit TXR150000 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, stormwater, 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 on -site 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 (for r example, 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 or entity, often the property owner, whose operational control is limited to: (a) the employment of other operators, such as a general contractor, to perform or supervise construction activities; or (b) the ability to approve or disapprove changes to construction plans and specifications, but who does not have day -to -day on -site operational control over construction activities at the site. Secondary operators must either prepare their own SWP3 or participate in a shared SWP3 that covers the areas of the construction site where they have control over the plans and specifications. If there is not a primary operator at the construction site, then the secondary operator is defined as the primary operator and must comply with the requirements for primary operators. Outfall - For the purpose of this permit, a point source at the point where stormwater 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 stormwater runoff and certain non - stormwater discharges. Page 9 Construction General Permit TPDES General Permit TXR150000 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 stormwater 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 (TWC) §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). Receiving Water - A "Water of the United States" as defined in 40 CFR §122.2 into which the regulated stormwater discharges. 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 stormwater; 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 (for example, the routine grading of existing dirt roads, asphalt overlays of existing roads, the routine clearing of existing right -of -ways, and similar maintenance activities.) Steep Slopes — Where a state, Tribe, local government, or industry technical manual (e.g. stormwater BMP manual) has defined what is to be considered a "steep slope ", this permit's definition automatically adopts that definition. Where no such definition exists, steep slopes are automatically defined as those that are 15 percent or greater in grade. Stormwater (or Stormwater Runoff) - Rainfall runoff, snow melt runoff, and surface runoff and drainage. Stormwater Associated with Construction Activity - Stormwater 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 reduce or prevent pollution in stormwater Page 10 Construction General Permit TPDES General Permit TXR150000 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. 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 nonnavigable, 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. Total Maximum Daily Load (TMDL) - The total amount of a pollutant that a water body can assimilate and still meet the Texas Surface Water Quality Standards. Turbidity — A condition of water quality characterized by the presence of suspended solids and /or organic material. Waters of the United States - (from 40 CFR §122.2) 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; (fl 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 U.S. This exclusion applies only to manmade bodies of water which neither were originally created in waters of the U.S. (such as Page 11 Construction General Permit TPDES General Permit TXR150000 disposal area in wetlands) nor resulted from the impoundment of waters of the U.S. Waters of the U.S. 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 CWA, the final authority regarding CWA jurisdiction remains with EPA. Part H. Permit Applicability and Coverage Section A. Discharges Eligible for Authorization 1. Stormwater Associated with Construction Activity Discharges of stormwater runoff from small and large construction activities may be authorized under this general permit. 2. Discharges of Stormwater Associated with Construction Support Activities 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. Construction support activities authorized under this general permit are not commercial operations, and do not serve multiple unrelated construction projects. Discharges of stormwater runoff from construction support activities may be authorized under this general permit, provided that the following conditions are met: (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), TXRo50000 (related to stormwater discharges associated with industrial activity), separate authorization under this general permit if applicable, coverage under an alternative general permit if available, or authorization under an individual water quality permit. 3. Non - Stormwater Discharges The following non - stormwater discharges from sites authorized under this general permit are also eligible for authorization under this general permit: (a) 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, or similar activities); (b) 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); (c) water from the routine external washing of vehicles, the external portion of buildings or structures, and pavement, where detergents and soaps are not used, where spills or leaks of toxic or hazardous materials have not occurred (unless spilled materials Page 12 Construction General Permit TPDES General Permit TXR150000 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; (d) uncontaminated water used to control dust; (e) potable water sources, including waterline flushings, but excluding discharges of hyperchlorinated water, unless the water is first dechlorinated and discharges are not expected to adversely affect aquatic life; (f) uncontaminated air conditioning condensate; (g) uncontaminated ground water or spring water, including foundation or footing drains where flows are not contaminated with industrial materials such as solvents; and (h) lawn watering and similar irrigation drainage. 4. Other Permitted Discharges Any discharge authorized under a separate National Pollutant Discharge Elimination System ( NPDES), TPDES, or TCEQ permit may be combined with discharges authorized by this general permit, provided those discharges comply with the associated permit. Section B. Concrete Truck Wash Out The wash out of concrete trucks at regulated construction sites must be performed in accordance with the requirements of Part V of this general permit. Section C. Limitations on Permit Coverage 1. Post Construction Discharges Discharges that occur after construction activities have been completed, and after the construction site and any supporting activity site have undergone final stabilization, are not eligible for coverage under this general permit. Discharges originating from the sites are not authorized under this general permit following the submission of the notice of termination (NOT) or removal of the appropriate site notice, as applicable, for the regulated construction activity. 2. Prohibition of Non - Stormwater Discharges Except as otherwise provided in Part II.A. of this general permit, only discharges that are composed entirely of stormwater associated with construction activity may be authorized under this general permit. 3. Compliance With Water Quality Standards Discharges to surface water in the state that would cause, have the reasonable potential to cause, or contribute to a violation of water quality standards or that would fail to 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 permit or alternative general permit (see Parts II.H.2. and 3.) to authorize discharges to surface water in the state if the executive director determines that any activity will cause, has the reasonable potential to cause, or contribute to a violation of water quality standards or is found to cause, has the reasonable potential to cause, or contribute to, the impairment of a designated use. The executive director may also require an application for an individual permit considering factors described in Part II.H.2. of this general permit. Page 13 Construction General Permit TPDES General Permit TXR150000 4. Impaired Receiving Waters and Total Maximum Daily Load (TMDL) Requirements 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 applicable state law. Impaired waters are those that do not meet applicable water quality standards and are listed on the EPA approved CWA §3o3(d) List. Pollutants of concern are those for which the water body is listed as impaired. Discharges of the pollutants of concern to impaired water bodies for which there is a TMDL are not eligible for this general permit unless they are consistent with the approved TMDL. Permittees must incorporate the conditions and requirements applicable to their discharges into their SWP3, in order to be eligible for coverage under this general permit. For consistency with the construction stormwater - related items in an approved TMDL, the SWP3 must be consistent with any applicable condition, goal, or requirement in the TMDL, TMDL Implementation Plan (I- Plan), or as otherwise directed by the executive director. 5. Discharges to the Edwards Aquifer Recharge or Contributing Zone Discharges cannot be authorized by this general permit where prohibited by 30 TAC Chapter 213 (relating to Edwards Aquifer). In addition, commencement of construction (i.e., the initial disturbance of soils associated with clearing, grading, or excavating 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 until the appropriate Edwards Aquifer Protection Plan (EAPP) has been approved by the TCEQ's Edwards Aquifer Protection Program. (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 (CZ), operators must meet all applicable requirements of, and operate according to, 3o TAC Chapter 213 (Edwards Aquifer Rule) in addition to the provisions and requirements of this general permit. (b) For existing discharges located within the Edwards Aquifer Recharge Zone, the requirements of the agency- approved Water Pollution Abatement Plan (WPAP) under the Edwards Aquifer Rule is in addition to the requirements of this general permit. BMPs and maintenance schedules for structural stormwater controls, for example, may be required as a provision of the rule. All applicable requirements of the Edwards Aquifer Rule for reductions of suspended solids in stormwater runoff are in addition to the requirements in this general permit for this pollutant. 6. Discharges to Specific Watersheds and Water Quality Areas Discharges otherwise eligible for coverage cannot be authorized by this general permit where prohibited by 30 TAC Chapter 311 (relating to Watershed Protection) for water quality areas and watersheds. 7. Protection of Streams and Watersheds by Other Governmental Entities This general permit does not limit the authority or ability of federal, other state, or local governmental entities from placing additional or more stringent requirements on construction activities or discharges from construction activities. For example, this permit does not limit the authority of a home -rule municipality provided by Texas Local Government Code §401.002. 8. Indian Country Lands 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 14 Construction General Permit TPDES General Permit TXR150000 regulations, authority for these discharges must be obtained from the U.S. Environmental Protection Agency (EPA). 9. Oil and Gas Production Stormwater runoff from construction activities associated with the exploration, development, or production of oil or gas or geothermal resources, including transportation of crude oil or natural gas by pipeline, 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 regulations, authority for these discharges must be obtained from the EPA. i o. Stormwater Discharges from Agricultural Activities Stormwater discharges from agricultural activities that are not point source discharges of stormwater are not subject to TPDES permit requirements. These activities may include clearing and cultivating ground for crops, construction of fences to contain livestock, construction of stock ponds, and other similar agricultural activities. Discharges of stormwater runoff associated with the construction of facilities that are subject to TPDES regulations, such as the construction of concentrated animal feeding operations, would be point sources regulated under this general permit. il. Endangered Species Act Discharges that would adversely affect a listed endangered or threatened aquatic or aquatic- dependent species or its critical habitat are not authorized by this permit, unless the requirements of the Endangered Species Act are satisfied. Federal requirements related to endangered species apply to all TPDES permitted discharges and site - specific controls may be required to ensure that protection of endangered or threatened species is achieved. If a permittee has concerns over potential impacts to listed species, the permittee may contact TCEQ for additional information. 12. Other Nothing in Part II of the general permit is intended to negate any person's ability to assert the force majeure (act of God, war, strike, riot, or other catastrophe) defenses found in 3o TAC §70.7. Section D. Deadlines for Obtaining Authorization to Discharge z. Large Construction Activities (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 under this general permit or a separate TPDES permit, prior to the commencement of those construction activities. (b) Ongoing Construction - Operators of large construction activities continuing to operate after the effective date of this permit, and authorized under TPDES general permit TXR150000 (effective on March 5, 20o8), must submit an NOI to renew authorization or a NOT to terminate coverage under this general permit within 90 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 conditions and requirements of the previous TPDES permit. 2. Small Construction Activities (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 Construction General Permit TPDES General Permit TXR150000 under this general permit or a separate TPDES permit, prior to the commencement of those construction activities. (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 the conditions to qualify for termination of this permit as described in Part II.E. of this general permit, must meet the requirements to be authorized, either under this general permit or a separate TPDES permit, within go 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 conditions and requirements of the previous TPDES permit. Section E. Obtaining Authorization to Discharge 1. Automatic Authorization for Small Construction Activities With Low Potential for Erosion: If all of the following conditions are met, then a small construction activity is determined to occur during periods of low potential for erosion, and a site operator may be automatically authorized under this general permit without being required to develop an SWP3 or submit an NOI: (a) the construction activity occurs in a county listed in Appendix A; (b) the construction activity is initiated and completed, including either final or temporary stabilization of all disturbed areas, within the time frame identified in Appendix A for the location of the construction site; (c) all temporary stabilization is adequately maintained to effectively reduce or prohibit erosion, permanent stabilization activities have been initiated, and a condition of final stabilization is completed no later than 3o days following the end date of the time frame identified in Appendix A for the location of the construction site; (d) the permittee signs a completed TCEQ construction site notice, including the certification statement; (e) a signed copy of the construction site notice is posted at the construction site in a 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 that location until completion of the construction activity; (f) a copy of the signed and certified construction site notice is provided to the operator of any MS4 receiving the discharge at least two days prior to commencement of construction activities; (g) any supporting concrete batch plant or asphalt batch plant is separately authorized for discharges of stormwater runoff or other non - stormwater discharges under an individual TPDES permit, another TPDES general permit, or under an individual TCEQ permit where stormwater and non - stormwater is disposed of by evaporation or irrigation (discharges are adjacent to water in the state); and (h) any non - stormwater discharges are either authorized under a separate permit or authorization, or are not considered to be a wastewater. Part II.G. of this general permit describes how an operator may apply for and obtain a 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 is not available. Page 16 Construction General Permit TPDES General Permit TXR150000 2. Automatic Authorization For All Other Small Construction Activities: Operators of small construction activities not described in Part II.E.1. above may be automatically authorized under this general permit, and operators of these sites shall not be required to submit an NOI, provided that they meet all of the following conditions: (a) develop a SWP3 according to the provisions of this general permit, that covers either the entire site or all portions of the site for which the applicant is the operator, and implement that plan prior to commencing construction activities; (b) sign and certify a completed TCEQ small construction site notice, post the notice at the construction site in a location where it is safely and readily available for viewing by the general public, local, state, and federal authorities, prior to commencing construction, and maintain the notice in that location until 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 construction is actively underway; notice for these linear sites may be relocated, as necessary, along the length of the project, and the notice must be safely and readily available for 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 any municipal separate storm sewer system receiving the discharge prior to commencement of construction activities. 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. As described in Part I (Definitions) of this general permit, large construction activities include those that will disturb less than five (5) acres of land, but that are part of a larger common plan of development or sale that will ultimately disturb five (5) or more acres of land, and must meet the requirements of Part ILE.3. below. 3. Authorization for Large Construction Activities: Operators of large construction activities that qualify for coverage under this general permit must meet all of the following conditions: (a) develop a SWP3 according to the provisions of this general permit that covers either the entire site or all portions of the site for which the applicant is the operator, and implement that plan prior to commencing construction activities; (b) primary operators must submit an NOI, using a form provided by the executive director, at least seven (7) days prior to commencing construction activities, or if utilizing electronic submittal, prior to commencing construction activities. If an additional primary operator is added after the initial NOI is submitted, the new primary operator must submit an NOI at least seven (7) days before assuming operational control, or if utilizing electronic NOI submittal, prior to assuming operational control. If the primary operator changes after the initial NOI is submitted, the new primary operator must submit a paper NOI or an electronic NOI at least ten (1o) days before assuming operational control; (c) all operators of large construction activities must post a site notice in accordance with Part III.D.2. of this permit. The site notice must be located where it is safely and readily available for viewing by the general public, local, state, and federal authorities prior to commencing construction, and must be maintained in that location until 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 construction is actively underway; notice for these linear sites may be relocated, as necessary, along the length of the project, and the notice must be safely and readily available for viewing by the general public; local, state, and federal authorities); Page 17 Construction General Permit TPDES General Permit TXR150000 (d) prior to commencing construction activities, all primary operators must (i) provide a copy of the signed NOI to the operator of any MS4 receiving the discharge and to any secondary construction operator, and (2) list in the SWP3 the names and addresses of all MS4 operators receiving a copy; (e) all persons meeting the definition of "secondary operator' in Part I of this permit are hereby notified that they are regulated under this general permit, but are not required to submit an NOI, provided that a primary operator at the site has submitted an NOI, or is required to submit an NOI, and the secondary operator has provided notification to the operator(s) of the need to obtain coverage (with records of notification available upon request). Any secondary operator notified under this provision may alternatively submit an NOI under this general permit, may seek coverage under an alternative TPDES individual permit, or may seek coverage under an alternative TPDES general permit if available; and (f) all secondary operators must provide a copy of the signed and certified Secondary Operator construction site notice to the operator of any MS4 receiving the discharge prior to commencement of construction activities. 4. Waivers for Small Construction Activities: Part II.G. describes how operators of certain small construction activities may obtain a waiver from coverage. 5. Effective Date of Coverage (a) Operators of small construction activities as described in either Part II.E.1. or II.E.2. above are authorized immediately following compliance with the applicable conditions of Part II.E.1. or II.E.2. Secondary operators of large construction 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 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 responsibilities under that rule. Construction may not commence for sites regulated under 3o TAC Chapter 213 until all applicable requirements of that rule are met. (b) Primary operators of large construction activities as described in Part II.E.3. above are provisionally authorized seven (7) days from the date that a completed NOI is postmarked for delivery to the TCEQ, unless otherwise notified by the executive director. If electronic submission of the NOI is provided, and unless otherwise notified by the executive director, primary operators are authorized immediately following confirmation of receipt of the NOI by the TCEQ. Authorization is non - provisional when the executive director finds the NOI is administratively complete and an authorization number is issued for the activity. For activities located in 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 responsibilities under that rule. Construction may not commence for sites regulated under 3o TAC Chapter 213 until all applicable requirements of that rule are met. (c) Operators are not prohibited from submitting late NOIs or posting late notices to obtain authorization under this general permit. The TCEQ reserves the right to take appropriate enforcement actions for any unpermitted activities that may have occurred between the time construction commenced and authorization was obtained. 6. Notice of Change (NOC) If relevant information provided in the 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 discovery of the change. If Page 18 Construction General Permit TPDES General Permit TXR150000 the operator becomes aware that it failed to submit any relevant facts or submitted 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 submitted on a form provided by the executive director, or by letter if an NOC form is 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 and addresses of all MS4 operators receiving a copy. Information that may be included on an NOC includes, but is not limited to, the following: the description of the construction project, an increase in the number of acres disturbed (for increases of one or more acres), or the operator name. A transfer of operational control from one operator to another, including a transfer of the ownership of a company, may not be included in an NOC. A transfer of ownership of a company includes changes to the structure of a company, such as changing from a partnership to a corporation or changing corporation types, so that the filing number (or charter number) that is on record with the Texas Secretary of State must be changed. An NOC is not required for notifying TCEQ of a decrease in the number of acres disturbed. This information must be included in the SWP3 and retained on site. 7. Signatory Requirement for NOI Forms, Notice of Termination (NOT) Forms, NOC Letters, and Construction Site Notices NOI forms, NOT forms, NOC letters, and Construction Site Notices that require a signature must be signed according to 3o TAC § 305.44 (relating to Signatories for Applications). 8. Contents of the NOI The NOI form shall require, at a minimum, the following information: (a) the TPDES CGP authorization number for existing authorizations under this general permit, where the operator submits an NOI to renew coverage within 90 days of the effective date of this general permit; (b) the name, address, and telephone number of the operator filing the NOI for permit coverage; (c) the name (or other identifier), address, county, and latitude /longitude of the construction project or site; (d) the number of acres that will be disturbed by the applicant; (e) confirmation that the project or site will not be located on Indian Country lands; (f) confirmation that a SWP3 has been developed in accordance with this general permit, that it will be implemented prior to construction, and that it is compliant with any applicable local sediment and erosion control plans; for multiple operators who 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 operator; (g) name of the receiving water(s); (h) the classified segment number for each classified segment that receives discharges from the regulated construction activity (if the discharge is not directly to a classified segment, then the classified segment number of the first classified segment that those discharges reach); and (i) the name of all surface waters receiving discharges from the regulated construction activity that are on the latest EPA - approved CWA § 303(d) List of impaired waters. Page 19 Construction General Permit TPDES General Permit TXR150000 Section F. Terminating Coverage 1. Notice of Termination (NOT) Required Each operator that has submitted an NOI for authorization under this general permit must apply to terminate that authorization following the conditions described in this 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 general permit terminates at midnight on the day the NOT is postmarked for delivery to the TCEQ. If electronic submission of the NOT is provided, authorization to discharge under this permit terminates immediately following confirmation of receipt of the NOT by the TCEQ. Compliance with the conditions and requirements of this permit is required until an NOT is submitted. The NOT must be submitted to TCEQ, and a copy of the NOT provided to the operator of any MS4 receiving the discharge (with a list in the SWP3 of the names and addresses of all MS4 operators receiving a copy), within 3o days after any of the following conditions are met: (a) final stabilization has been achieved on all portions of the site that are the responsibility of the permittee; (b) a transfer of operational control has occurred (See Section II.F.4. below); or (c) the operator has obtained alternative authorization under an individual TPDES permit or alternative TPDES general permit. 2. Minimum Contents of the NOT The NOT form shall require, at a minimum, the following information: (a) if authorization was granted following submission of an NOI, the permittee's site - specific TPDES authorization number for the construction site; (b) an indication of whether the construction activity is completed or if the permittee is simply no longer an operator at the site; (c) the name, address, and telephone number of the permittee submitting the NOT; (d) the name (or other identifier), address, county, and location (latitude/longitude) of the construction project or site; and (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 operator of the facility or construction site, and that all temporary structural erosion 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 permit coverage. Erosion controls that are designed to remain in place for an indefinite period, such as mulches and fiber mats, are not required to be removed or scheduled for removal. 3. Termination of Coverage for Small Construction Sites and for Secondary Operators at Large Construction Sites Each operator that has obtained automatic authorization and has not been required to submit an NOI must remove the site notice upon meeting any of the conditions listed below, complete the applicable portion of the site notice related to removal of the site notice, and submit a copy of the completed site notice to the operator of any MS4 receiving the discharge (or provide alternative notification as allowed by the MS4 operator, with documentation of such notification included in the SWP3), within 3o days of meeting any of the following conditions: Page 20 Construction General Permit TPDES General Permit TXR150000 (a) final stabilization has been achieved on all portions of the site that are the responsibility of the permittee; (b) a transfer of operational control has occurred (See Section II.F.4. below); or (c) the operator has obtained alternative authorization under an individual or general TPDES permit. Authorization to discharge under this general permit terminates immediately upon removal of the applicable site notice. Compliance with the conditions and requirements of this permit is required until the site notice is removed. 4. Transfer of Operational Control Coverage under this general permit is not transferable. A transfer of operational control includes changes to the structure of a company, such as changing from a partnership to a corporation, or changing to a different corporation type such that a different filing (or charter) number is established with the Texas Secretary of State. When the primary operator of a large construction activity changes or operational control is transferred, the original operator must submit an NOT within ten (io) days prior to the date that responsibility for operations terminates, and the new operator must submit an NOI at least ten (i o) days prior to the transfer of operational control, in 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 II.F.i. above. Operators of regulated construction activities who are not required to submit an NOI must remove the original site notice, and the new operator must post the required site notice prior to the transfer of operational control, in accordance with condition (a) or (b) 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. A transfer of operational control occurs when either of the following criteria is met: (a) Another operator has assumed control over all areas of the site that have not been finally stabilized; and all silt fences and other temporary erosion controls have either 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 operator in writing of the requirement to obtain permit coverage. Record of this notification (or attempt at notification) shall be retained by the operator in accordance with Part VI of this permit. Erosion controls that are designed to remain in place for an indefinite period, such as mulches and fiber mats, are not required to be removed or scheduled for removal. (b) A homebuilder has purchased one or more lots from an operator who obtained coverage under this general permit for a common plan of development or sale. The homebuilder is considered a new operator and shall comply with the requirements listed above, including the development of a SWP3 if necessary. Under these 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 original operator remains responsible for common controls or discharges, and must amend its SWP3 to remove the lot(s) transferred to the homebuilder. Section G. Waivers from Coverage The executive director may waive the otherwise applicable requirements of this general permit for stormwater discharges from small construction activities under the terms and conditions described in this section. Page 21 Construction General Permit TPDES General Permit TXR150000 1. Waiver Applicability and Coverage Operators of small construction activities may apply for and receive a waiver from the requirements to obtain authorization under this general permit, where all of the following conditions are met. This waiver from coverage does not apply to non- 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 be a wastewater. (a) the calculated rainfall erosivity (R) factor for the entire period of the construction project is less than five (5); (b) the operator submits to the TCEQ a signed waiver certification form, supplied by the executive director, certifying that the construction activity will commence and be completed within a period when the value of the calculated R factor is less than five (5); and (c) the waiver certification form is postmarked for delivery to the TCEQ at least seven (7) days before construction activity begins or, if electronic filing is available, then any time following the receipt of written confirmation from TCEQ that a complete electronic application was submitted and acknowledged. 2. Steps to Obtaining a Waiver The construction site operator may calculate the R factor to request a waiver using the following steps: (a) Estimate the construction start date and the construction end date. The construction end date is the date that final stabilization will be achieved. (b) Find the appropriate Erosivity Index (EI) zone in Appendix B of this permit. (c) Find the EI percentage for the project period by adding the results for each period of the project using the table provided in Appendix D of this permit, in EPA Fact Sheet 2.1, or in USDA Handbook log, by subtracting the start value from the end value to find the percent EI for the site. (d) Refer to the Isoerodent Map (Appendix C of this permit) and interpolate the annual isoerodent value for the proposed construction location. (e) Multiply the percent value obtained in Step (c) above by the annual isoerodent value obtained in Step (d). This is the R factor for the proposed project. If the value is less than 5, then a waiver may be obtained. If the value is five (5) or more, then a waiver may not be obtained, and the operator must obtain coverage under Part II.E.2. of this permit. Alternatively, the operator may calculate a site - specific R factor utilizing the following online calculator: http://ei.tamu.edu/index.htm], or using another available resource. The waiver certification form is not required to be posted at the small construction site. 3. Effective Date of Waiver 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 completed waiver certification form is postmarked for delivery to TCEQ, or immediately upon receiving confirmation of approval of an electronic submittal, if electronic form submittals are available. 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 22 Construction General Permit TPDES General Permit TXR150000 (a) recalculate the R factor using the original start date and a new projected ending date, and if the R factor is still under five (5), submit a new waiver certification form at least two (2) days before the end of the original waiver period; or (b) obtain authorization under this general permit according to the requirements delineated in either Part II.E.2. or Part II.E.3. before the end of the approved waiver period. Section H. Alternative TPDES Permit Coverage 1. Individual Permit Alternative Any discharge eligible for coverage under this general permit may alternatively be authorized under an individual TPDES permit according to 3o TAC §305 (relating to Consolidated Permits). Applications for individual permit coverage should be submitted at least three hundred and thirty (330) days prior to commencement of construction activities to ensure timely authorization. 2. Individual Permit Required The executive director may suspend an authorization or deny an NOI in accordance with the procedures set forth in 3o TAC §205 (relating to General Permits for Waste Discharges), including the requirement that the executive director provide written notice to the permittee. The executive director may require an operator of a construction site, otherwise eligible for authorization under this general permit, to apply for an individual TPDES permit in the following circumstances: (a) the conditions of an approved TMDL or TMDL I -Plan on the receiving water; (b) the activity being determined to cause a violation of water quality standards or being found to cause, or contribute to, the loss of a designated use of surface water in the state: and (c) any other consideration defined in 30 TAC Chapter 205 (relating to General Permits for Waste Discharges) including 3o TAC Chapter 205.4(c)(3)(D), which allows the commission to deny authorization under the general permit and require an individual permit if a discharger "has been determined by the executive director to have been out of compliance with any rule, order, or permit of the commission, including non- payment of fees assessed by the executive director." Additionally, the executive director may cancel, revoke, or suspend authorization to discharge under this general permit based on a finding of historical and significant noncompliance with the provisions of this general permit, relating to 3o TAC §60.3 (Use of Compliance History). Denial of authorization to discharge under this general permit or suspension of a permittee's authorization under this general permit shall be done according to commission rules in 3o TAC Chapter 205 (relating to General Permits for Waste Discharges). 3. Alternative Discharge Authorization Any discharge eligible for authorization under this general permit may alternatively be authorized under a separate general permit according to 3o TAC Chapter 205 (relating to General Permits for Waste Discharges), if applicable. Section I. Permit Expiration This general permit is effective for a term not to exceed five (5) years. All active discharge authorizations expire on the date provided on page one (1) of this permit. Following public notice and comment, as provided by 3o TAC §205.3 (relating to Page 23 Construction General Permit TPDES General Permit TXR150000 Public Notice, Public Meetings, and Public Comment), the commission may amend, revoke, cancel, or renew this general permit. 2. If the executive director publishes a notice of the intent to renew or amend this general permit before the expiration date, the permit will remain in effect for existing, authorized discharges until the commission takes final action on the permit. Upon issuance of a renewed or amended permit, permittees may be required to submit an NOI within go days following the effective date of the renewed or amended permit, unless that permit provides for an alternative method for obtaining authorization. If the commission does not propose to reissue this general permit within go days before the expiration date, permittees shall apply for authorization under an individual permit or an alternative general permit. If the application for an individual permit is submitted before the expiration date, authorization under this expiring general permit remains in effect until the issuance or denial of an individual permit. No new NOIs will be accepted nor new authorizations honored under the general permit after the expiration date. Part III. Stormwater Pollution Prevention Plans (SWP3) All regulated construction site operators shall prepare an SWP3, prior to submittal of an NOI, to address discharges authorized under Parts II.E.2. and II.E.3. of this general permit that will reach Waters of the U.S., including discharges to MS4s and privately owned 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 from the construction site, including off -site material storage areas, overburden and stockpiles of dirt, borrow areas, equipment staging areas, vehicle repair areas, fueling areas, etc., used solely by the permitted project. The SWP3 must describe the implementation of practices that will be used to minimize to the extent practicable the discharge of pollutants in 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. Individual operators at a site may develop separate SWP3s that cover only their portion of the project, provided reference is made to the other operators at the site. Where there is more than one SWP3 for a site, permittees must coordinate to ensure that BMPs and controls are consistent and do not negate or impair the effectiveness of each other. Regardless of whether a single comprehensive SWP3 is developed or separate SWP3s are developed for each operator, it is the responsibility of each operator to ensure compliance with the terms and conditions of this general permit in the areas of the construction site where that operator has control over construction plans and specifications or day -to -day operations. Section A. Shared SWP3 Development For more effective coordination of BMPs and opportunities for cost sharing, a cooperative effort by the different operators at a site is encouraged. Operators must independently obtain authorization, but may work together to prepare and implement a single, comprehensive SWP3 for the entire construction site. L. The SWP3 must clearly list the name and, for large construction activities, the general 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 authorization number, the SWP3 must specify the date that the NOI was submitted to TCEQ by each operator. Each operator participating in the shared plan must also sign the SWP3. Page 24 Construction General Permit TPDES General Permit TXR150000 2. The SWP3 must clearly indicate which operator is responsible for satisfying each shared requirement of the SWP3. If the responsibility for satisfying a requirement is 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 construction activities. The SWP3 must clearly describe responsibilities for meeting each requirement in shared or common areas. 3. The SWP3 may provide that one operator is responsible for preparation of a SWP3 in compliance with the CGP, and another operator is responsible for implementation of the SWP3 at the project site. Section B. Responsibilities of Operators 1. Secondary Operators and Primary Operators with Control Over Construction Plans and Specifications All secondary operators and primary operators with control over construction plans and specifications shall: (a) ensure the project specifications allow or provide that adequate BMPs are developed to meet the requirements of Part III of this general permit; (b) 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; (c) ensure that 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 this general permit; and (d) ensure that the SWP3 for portions of the project where they are operators indicates the name and site - specific TPDES authorization number(s) for 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 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. 2. Primary Operators with Day -to -Day Operational Control Primary operators 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: (a) meets the requirements of this general permit for those portions of the project where they are operators; (b) identifies the parties responsible for implementation of BMPs described in the SWP3; (c) indicates areas of the project where they have operational control over day -to -day activities; and (d) 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. Section C. Deadlines for SWP3 Preparation, Implementation, and Compliance The SWP3 must be prepared prior to obtaining authorization under this general permit, and implemented prior to commencing construction activities that result in soil Page 25 Construction General Permit TPDES General Permit TXR150000 disturbance. The SWP3 must be prepared so that it provides for compliance with the terms and conditions of this general permit. Section D. Plan Review and Malting Plans Available 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. The SWP3 must be made readily available at the time of an on -site inspection to: the executive director; a federal, state, or local agency approving sediment and erosion plans, grading plans, or stormwater management plans; local government officials; and the operator of a municipal separate storm 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 that the SWP3 shall be made available within 24 hours of the request. A primary operator of a large construction activity must post the TCEQ site notice near the main entrance of the construction site. An operator of a small construction 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.1., 2., or 3. of this general permit in order to obtain authorization. If the construction project is a linear construction project, such as a pipeline or highway, the notices must be placed in a publicly accessible location near where construction is actively underway. Notices for these linear sites may be relocated, as necessary, along the 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: (a) the site - specific TPDES authorization number for the project if assigned; (b) the operator name, contact name, and contact phone number; (c) a brief description of the project; and (d) the location of the SWP3. 3. This permit does not provide the general public with any right to trespass on a construction site for any reason, including inspection of a site; nor does this permit require that permittees allow members of the general public access to a construction site. Section E. Revisions and Updates to SWP3s The permittee must revise or update the SWP3 whenever the following occurs: 1. 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; 2. changing site conditions based on updated plans and specifications, new operators, new areas of responsibility, and changes in BMPs; or 3. results of inspections or investigations by site operators, operators of a municipal separate storm sewer system receiving the discharge, authorized TCEQ personnel, or a 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 this general permit. Section F. Contents of SWP3 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, Section G of the general permit. Page 26 Construction General Permit TPDES General Permit TXR150000 1. A site or project description, which includes the following information: (a) a description of the nature of the construction activity; (b) a list of potential pollutants and their sources; (c) a description of the intended schedule or sequence of activities that will disturb soils for major portions of the site, including estimated start dates and duration of activities; (d) the total number of acres of the entire property and the total number of acres where construction activities will occur, including off -site material storage areas, overburden and stockpiles of dirt, and borrow areas that are authorized under the permittee's NOI; (e) data describing the soil or the quality of any discharge from the site; (f) a map showing the general location of the site (e.g. a portion of a city or county map); (g) a detailed site map (or maps) indicating the following: M drainage patterns and approximate slopes anticipated after major grading activities; (ii) areas where soil disturbance will occur; (iii) locations of all controls and buffers, either planned or in place; (iv) locations where temporary or permanent stabilization practices are expected to be used; (v) locations of construction support activities, including off -site activities, that are authorized under the permittee's NOI, including material, waste, borrow, fill, or equipment or chemical storage areas; (vi) surface waters (including wetlands) either at, adjacent, or in close proximity to the site, and also indicating those that are impaired waters; (vii) locations where stormwater discharges from the site directly to a surface water body or a municipal separate storm sewer system; (viii) vehicle wash areas; and (ix) designated points on the site where vehicles will exit onto paved roads (for instance, this applies to construction transition from unstable dirt areas to exterior paved roads). Where the amount of information required to be included on the map would result in a single map being difficult to read and interpret, the operator shall develop a series of maps that collectively include the required information. (h) the location and description of support activities authorized under the permittee's NOI, including asphalt plants, concrete plants, and other activities providing support to the construction site that is authorized under this general permit; (i) the name of receiving waters at or near the site that may be disturbed or that may receive discharges from disturbed areas of the project; 0) a copy of this TPDES general permit; (k) the NOI and acknowledgement certificate for primary operators of large construction sites, and the site notice for small construction sites and for secondary operators of large construction sites; (1) stormwater and allowable non - stormwater discharge locations, including storm drain inlets on site and in the immediate vicinity of the construction site; and Page 27 Construction General Permit TPDES General Permit TXR150000 (m) locations of all pollutant - generating activities, such as paving operations; concrete, paint and stucco washout and water disposal; solid waste storage and disposal; and dewatering operations. 2. A description of the BMPs that will be used to minimize pollution in runoff. The description must identify the general timing or sequence for implementation. At a minimum, the description must include the following components: (a) General Requirements (i) Erosion and sediment controls must be designed to retain sediment on -site to the extent practicable with consideration for local topography, soil type, and rainfall. (ii) Control measures must be properly selected, installed, and maintained according to the manufacturer's or designer's specifications. (iii) Controls must be developed to minimize the offsite transport of litter, construction debris, and construction materials. (b) Erosion Control and Stabilization Practices The SWP3 must include a description of temporary and permanent erosion control and stabilization practices for the site, compliant with the requirements of Part III.G.1 and G.2 of this general permit, including a schedule of when the practices will be implemented. Site plans should ensure that existing vegetation is preserved where it is possible. (i) Erosion control and stabilization practices may include but are not limited to: establishment of temporary or permanent vegetation, mulching, geotextiles, sod stabilization, vegetative buffer strips, protection of existing trees and vegetation, slope texturing, temporary velocity dissipation devices, flow diversion mechanisms, and other similar measures. (ii) The following records must be maintained and either attached to or referenced in the SWP3, and made readily available upon request to the parties listed in Part III.D.1 of this general permit: (A) the dates when major grading activities occur; (B) the dates when construction activities temporarily or permanently cease on a portion of the site; and (C) the dates when stabilization measures are initiated. (iii) 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 measures: (A) Where the immediate initiation of stabilization measures after construction activity temporarily or permanently ceased is precluded Page 28 Construction General Permit TPDES General Permit TXR150000 by snow cover or frozen ground conditions, stabilization measures must be initiated as soon as practicable. (B) In and 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 and conditions, erosion control and stabilization measures must be initiated as soon as practicable. Where vegetative controls are not feasible due to and 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 as required in Paragraph (C) below. (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. (iv) Final stabilization must be achieved prior to termination of permit coverage. (v) TCEQ does not expect that temporary or permanent stabilization measures 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, areas being used for storage of vehicles, equipment, or materials). (c) Sediment Control Practices The SWP3 must include a description of any sediment control practices used to remove eroded soils from stormwater runoff, including the general timing or sequence for implementation of controls. (i) Sites With Drainage Areas of Ten or More Acres (A) Sedimentation Basin(s) (1) A sedimentation basin is required, where feasible, for a common drainage location that serves an area with ten (1o) 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. When calculating the volume of 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 are either undisturbed or have already undergone permanent stabilization, if these flows are diverted around both the disturbed areas of the site and the sediment basin. Capacity calculations shall be included in the SWP3. Page 29 Construction General Permit TPDES General Permit TXR150000 (2) Where rainfall data is not available or a calculation cannot be performed, the sedimentation basin must provide at least 3,600 cubic feet of storage per acre drained until final stabilization of the site. (3) 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. (4) Unless infeasible, when discharging from sedimentation basins and impoundments, the permittee shall utilize outlet structures that withdraw water from the surface. (B) Perimeter Controls: 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. (ii) Controls for Sites With Drainage Areas Less than Ten Acres: (A) Sediment traps and sediment basins may be used to control solids in stormwater runoff for drainage locations serving less than ten (1o) 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. (B) Alternatively, a sediment basin that provides storage for a calculated 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 calculation cannot be performed, a temporary or permanent sediment basin providing 3,600 cubic feet of storage per acre drained may be provided. If a calculation is performed, then the calculation shall be included in the SWP3. (C) If sedimentation basins or impoundments are used, the permittee shall comply with the requirements in Part III.G.6 of this general permit. 3. Description of Permanent Stormwater Controls A description of any measures that will be installed during the construction process to control pollutants in stormwater discharges that may occur after construction operations have been completed must be included in the SWP3. Permittees are only responsible for the installation and maintenance of stormwater management measures prior to final stabilization of the site or prior to submission of an NOT. 4. Other Required Controls and BMPs (a) Permittees shall minimize, to the extent practicable, the off -site vehicle tracking of sediments and the generation of dust. The SWP3 shall include a description of controls utilized to accomplish this requirement. Page 30 Construction General Permit TPDES General Permit TXR150000 (b) The SWP3 must include a description of construction and waste materials expected to be stored on -site and a description of controls to minimize pollutants from these materials. (c) The SWP3 must include a description of potential pollutant sources from areas other than construction (such as stormwater discharges from dedicated asphalt plants and dedicated concrete batch plants), and a description of controls and measures that will be implemented at those sites to minimize pollutant discharges. (d) Permittees shall place velocity dissipation devices at discharge locations and along the length of any outfall channel (i.e., runoff conveyance) to provide a non - erosive flow velocity from the structure to a water course, so that the natural physical and biological characteristics and functions are maintained and protected. (e) Permittees shall design and utilize appropriate controls to minimize the offsite transport of suspended sediments and other pollutants if it is necessary to pump or channel standing water from the site. (f) Permittees shall ensure that all other required controls and BMPs comply with all of the requirements of Part III.G of this general permit. 5. Documentation of Compliance with Approved State and Local Plans (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. (c) If the permittee is required to prepare a separate management plan, including but not limited to a WPAP or Contributing Zone Plan in accordance with 3o TAC Chapter 213 (related to the Edwards Aquifer), then a copy of that plan must be either included in the SWP3 or made readily available upon request to authorized personnel of the TCEQ. The permittee shall maintain a copy of the approval letter for the plan in its SWP3. 6. Maintenance Requirements (a) 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. (b) 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. (c) Sediment must be removed from sediment traps and sedimentation ponds no later than the time that design capacity has been reduced by 5o %. For perimeter Page 31 Construction General Permit TPDES General Permit TXR150000 controls such as silt fences, berms, etc., the trapped sediment must be removed before it reaches 50% of the above - ground height. (d) 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. 7. Inspections of Controls (a) Personnel provided by the permittee 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 this 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. Inspections must be conducted at least once every 14 calendar days and within 24 hours of the end of a storm event of 0.5 inches or greater. Where sites have been finally or temporarily stabilized or where runoff is unlikely due to winter conditions (e.g. site is covered with snow, ice, or frozen ground exists), inspections must be conducted at least once every month. In arid, semi -arid, or drought- stricken areas, inspections must be conducted at least once every month and within 24 hours after the end of a storm event of 0.5 inches or greater. The SWP3 must also contain a record of the total rainfall measured, as well as the approximate beginning and ending dates of winter or drought conditions resulting in monthly frequency of inspections. As an alternative to the above - described inspection schedule of once every 14 calendar days and within 24 hours of a storm event of 0.5 inches or greater, the SWP3 may be developed to require that these inspections will occur at least once every seven (7) calendar days. If this alternative schedule is developed, then the inspection must occur regardless of whether or not there has been a rainfall event since the previous inspection. The inspections may occur on either schedule provided that the SWP3 reflects the current schedule and that any changes to the schedule are conducted in accordance with the following provisions: the schedule may be changed a maximum of one time each month, the schedule change must be implemented at the beginning of a calendar month, and the reason for the schedule change must be documented in the SWP3 (e.g., end of "dry" season and beginning of "wet" season). (b) Utility line installation, pipeline construction, and other examples of long, narrow, linear construction activities may provide inspection personnel with limited access to the areas described in Part III.F.7.(a) above. 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 inspected at least once every 14 calendar days and within 24 hours of the end of a storm event Of 0.5 inches or greater, 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 described in Part III.F.7.(a) Page 32 Construction General Permit TPDES General Permit TXR150000 above. The conditions of the controls along each inspected 0.25 mile portion 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 mile inspected portion, or to the end of the project, whichever occurs first. As an alternative to the above - described inspection schedule of once every 14 calendar days and within 24 hours of a storm event of o.5 inches or greater, the SWP3 may be developed to require that these inspections will occur at least once every seven (7) calendar days. If this alternative schedule is developed, the inspection must occur regardless of whether or not there has been a rainfall event since the previous inspection. The inspections may occur on either schedule provided that the SWP3 reflects the current schedule and that any changes to the schedule are conducted in accordance with the following provisions: the schedule may be changed a maximum of one time each month, the schedule change must be implemented at the beginning of a calendar month, and the reason for the schedule change must be documented in the SWP3 (e.g., end of "dry" season and beginning of "wet" season). (c) 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. (d) 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. If implementation before the next anticipated storm event is impracticable, these changes must be implemented as soon as practicable. (e) A report summarizing the scope of the inspection, the date(s) of the inspection, and major observations relating to the implementation of the SWP3 must be made and retained as part of the SWP3. Major observations should include: The locations of discharges of sediment or other pollutants from the site; locations of BMPs that need to be maintained; locations of BMPs that failed to operate as designed or proved inadequate for a particular location; and locations where additional BMPs are needed. Actions taken as a result of inspections must be described within, and retained as a part of, the SWP3. Reports must identify any incidents of non - compliance. Where a report does not identify any incidents of non - compliance, the report 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 manner required by 3o TAC §305.128 (relating to Signatories to Reports). The names and qualifications of personnel making the inspections for the permittee may be documented once in the SWP3 rather than being included in each report. 8. The SWP3 must identify and ensure the implementation of appropriate pollution prevention measures for all eligible non - stormwater components of the discharge, as listed in Part II.A.3. of this permit. 9. The SWP3 must include the information required in Part III.B. of this general permit. 1o. The SWP3 must include pollution prevention procedures that comply with Part III.G.4 of this general permit. Page 33 Construction General Permit TPDES General Permit TXR150000 Section G. Erosion and Sediment Control Requirements Applicable to All Sites 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). 1. 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; (i) 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. 2. 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 Page 34 Construction General Permit TPDES General Permit TXRi50000 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. Refer to Part III.F.2.(b) for complete erosion control and stabilization practice requirements. 3. Dewatering. Discharges from dewatering activities, including discharges from dewatering of trenches and excavations, are prohibited, unless managed by appropriate controls. 4. 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. 5. 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. 6. Surface outlets. When discharging from basins and impoundments, utilize outlet structures that withdraw water from the surface, unless infeasible. Part IV. Stormwater Runoff from Concrete Batch Plants Discharges of stormwater 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 stormwater 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 Operators of concrete batch plants authorized under this general permit shall sample the stormwater runoff from the concrete batch plants according to the requirements Page 35 Construction General Permit TPDES General Permit TXR150000 of this section of this general permit, and must conduct evaluations on the effectiveness of the SWP3 based on the following benchmark monitoring values: Table i. Benchmark Parameters Benchmark Parameter Benchmark Value Sampling Frequency Sample Type Oil and Grease 15 mg /L i /quarter ( *1) ( *2) Grab ( *3) Total Suspended Solids loo mg /L i /quarter ( *1) ( *2) Grab ( *3) pH 6.0 — 9.o Standard Units i /quarter ( *1) ( *2) Grab ( *3) Total Iron 1.3 mg /L i /quarter ( *1) ( *2) Grab ( *3) ( *i) 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 stormwater discharge occurs from a concrete batch plant authorized under this general permit. January through March April through June July through September October through December For projects lasting less than one full quarter, a minimum of one sample shall be collected, provided that a stormwater discharge occurred at least once following submission of the NOI or following the date that automatic authorization was obtained under Section II.E.2., and prior to terminating coverage. ( *3) A grab sample shall be collected from the stormwater discharge resulting from a storm event that is at least oa inches of measured precipitation that occurs at least 72 hours from the previously measurable storm event. The sample shall be collected downstream of the concrete batch plant, and where the discharge exits any BMPs utilized to handle the runoff from the batch plant, prior to commingling with any other water authorized under this general permit. 2. The permittee must compare the results of sample analyses to the benchmark values above, and must include this comparison in the overall assessment of the SWP3's effectiveness. Analytical results that exceed a benchmark value are not a violation of this permit, as these values are not numeric effluent limitations. Results of analyses are indicators that modifications of the SWP3 should be assessed and maybe necessary to protect water quality. The operator must investigate the cause for each exceedance and must document the results of this investigation in the SWP3 by the end of the quarter following the sampling event. Page 36 Construction General Permit TPDES General Permit TXR150000 The operator's investigation must identify the following: (a) any additional potential sources of pollution, such as spills that might have occurred, (b) necessary revisions to good housekeeping measures that are part of the SWP3, (c) additional BMPs, including a schedule to install or implement the BMPs, and (d) other parts of the SWP3 that may require revisions in order to meet the goal of the benchmark values. Background concentrations of specific pollutants may also be considered during the investigation. If the operator is able to relate the cause of the exceedance to background concentrations, then subsequent exceedances of benchmark values for that pollutant may be resolved by referencing earlier findings in the SWP3. Background concentrations may be identified by laboratory analyses of samples of stormwater runon to the permitted facility, by laboratory analyses of samples of stormwater run -off from adjacent non - industrial areas, or by identifying the pollutant is a naturally occurring material in soils at the site. Section B. Best Management Practices (BMPs) and SWP3 Requirements Minimum SWP3 Requirements — The following are required in addition to other SWP3 requirements listed in this general permit (including, but not limited to Part III.F.7. of this permit): t. 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 stormwater 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 stormwater discharges associated with concrete batch plants that are authorized under this permit; (a) 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. (b) Inventory of Exposed Materials — A list of materials handled at the concrete batch plant that may be exposed to stormwater and that have a potential to Page 37 Construction General Permit TPDES General Permit TXR150000 affect the quality of stormwater discharges associated with concrete batch plants that are authorized under this general permit. (c) Spills and Leaks - A list of significant spills and leaks of toxic or hazardous pollutants that occurred in areas exposed to stormwater and that drain to stormwater outfalls associated with concrete batch plants authorized under this general permit must be developed, maintained, and updated as needed. (d) Sampling Data - A summary of existing stormwater discharge sampling data must be maintained, if available. 2. Measures and Controls - The SWP3 must include a description of management controls to regulate pollutants identified in the SWP3's "Description of Potential Pollutant Sources" from Part IV.B.i.(a) of this permit, and a schedule for implementation of the measures and controls. This must include, at a minimum: (a) Good Housekeeping - Good housekeeping measures must be developed and implemented in the area(s) associated with concrete batch plants. (1) Operators must prevent or minimize the discharge of spilled cement, aggregate (including sand or gravel), settled dust, or other significant materials from paved portions of the site that are exposed to stormwater. Measures used to minimize the presence of these materials may include regular sweeping or other equivalent practices. These practices must be conducted at a frequency that is determined based on consideration of the amount of industrial activity occurring in the area and frequency of precipitation, and shall occur at least once per week when cement or aggregate is being handled or otherwise processed in the area. (2) Operators must prevent the exposure of fine granular solids, such as cement, to stormwater. Where practicable, these materials must be stored in enclosed silos, hoppers or buildings, in covered areas, or under covering. (b) Spill Prevention and Response Procedures - Areas where potential spills that can contribute pollutants to stormwater 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. (c) Inspections - Qualified facility 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) must be identified to inspect designated equipment and areas of the facility specified in the SWP3. The inspection frequency must be specified in the SWP3 based upon a consideration of the level of 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 stormwater 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. (d) 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 stormwater pollution prevention, with the provisions of the SWP3. The frequency of training must be documented in Page 38 Construction General Permit TPDES General Permit TXR150000 the SWP3, and at a minimum, must consist of one training prior to the initiation of operation of the concrete batch plant. (e) 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 stormwater 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. (f) 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. 3. 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. (a) Visual examination of all areas draining stormwater 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 structural controls and implementation of management practices) must be evaluated to determine if they are effective and if they are implemented in 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 the SWP3, such as spill response equipment. (b) Based on the results of the evaluation, the following must be revised as appropriate within two weeks of the evaluation: the description of potential pollutant sources identified in the SWP3 (as required in Part W.B.1., "Description of Potential Pollutant Sources "); and pollution prevention measures and controls identified in the SWP3 (as required in Part IV.B.2., "Measures and Controls "). The revisions may include a schedule for implementing the necessary changes. (c) The permittee shall prepare and include in the SWP3 a report summarizing the scope of the evaluation, the personnel making the evaluation, the date(s) of the evaluation, major observations relating to the implementation of the SWP3, 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 incidences of noncompliance, the report must contain a statement that the evaluation did not identify any incidence(s), and the report must be signed according to 3o TAC §305.128, relating to Signatories to Reports. (d) The Comprehensive Compliance Evaluation may substitute for one of the required inspections delineated in Part IV.B.2.(c) of this general permit. Section C. Prohibition of Wastewater Discharges Wastewater discharges associated with concrete production including wastewater disposal by land application are not authorized under this general permit. These wastewater discharges must be authorized under an alternative TCEQ water quality permit or otherwise disposed of in an authorized manner. Discharges of concrete truck wash out at construction sites may be authorized if conducted in accordance with the requirements of Part V of this general permit. Page 39 Construction General Permit TPDES General Permit TXR150000 Part V. 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. Any other direct discharge of concrete production waste water must be authorized under a separate TCEQ general permit or individual permit. i. 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 wash out as the result of rainfall or stormwater runoff. 4. The discharge of wash out water must 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 site map. Part VI. Retention of Records The permittee must retain the following records for a minimum period of three (3) years from the date that a NOT is submitted as required by Part II.E.3. For activities in which an NOT is not required, records shall be retained for a minimum period of three (3) years from the date that the operator terminates coverage under Section II.F.3. of this permit. Records include: 1. A copy of the SWP3; 2. All reports and actions required by this permit, including a copy of the construction site notice; 3. All data used to complete the NOI, if an NOI is required for coverage under this general permit; and 4. All records of submittal of forms submitted to the operator of any MS4 receiving the discharge and to the secondary operator of a large construction site, if applicable. Part VII. Standard Permit Conditions i. The permittee has a duty to comply with all permit conditions. Failure to comply 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 coverage under this general permit, or for requiring a discharger to apply for and obtain an individual TPDES permit. 2. Authorization under this general permit may be suspended or revoked for cause. Filing a notice of planned changes or anticipated non - compliance by the permittee does not stay any permit condition. The permittee must furnish to the executive director, upon request and within a reasonable time, any information necessary for the executive director to determine whether cause exists for revoking, suspending, or Page 40 Construction General Permit TPDES General Permit TXR150000 terminating authorization under this permit. Additionally, the permittee must provide to the executive director, upon request, copies of all records that the permittee is required to maintain as a condition of this general permit. 3. It is not a defense for a discharger in an enforcement action that it would have been 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 40 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 § §301, 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 40 CFR §122.410), as applicable. Part VIII. Fees i. 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 Construction General Permit TPDES General Permit TXR150000 2. Fees are due upon submission of the NOI. An NOI will not be declared administratively complete unless the associated fee has been paid in full. 3. No separate annual fees will be assessed for this general permit. The Water Quality Annual Fee has been incorporated into the NOI fees as described above. Page 42 Construction General Permit TPDES General Permit TXR150000 Appendix A: Automatic Authorization Periods of Low Erosion Potential by County — Eligible Date Ranges Andrews: Nov. 15 - Apr. 30 Archer: Dec. 15 - Feb. 14 Armstrong: Nov. 15 - Apr. 30 Bailey: Nov. 1- Apr. 30, or Nov. 15 - May 14 Baylor: Dec. 15 - Feb. 14 Borden: Nov. 15 - Apr. 30 Brewster: Nov. 15 - Apr. 30 Briscoe: Nov. 15 - Apr. 30 Brown: Dec. 15 - Feb. 14 Callahan: Dec. 15 - Feb. 14 Carson: Nov. 15 - Apr. 30 Castro: Nov. 15 - Apr. 30 Childress: Dec. 15 - Feb. 14 Cochran: Nov. 1 - Apr. 30, or Nov. 15 May 14 Coke: Dec. 15 - Feb. 14 Coleman: Dec. 15 - Feb. 14 Collingsworth: Jan. 1- Mar. 30, or Dec. 1- Feb. 28 Concho: Dec. 15 - Feb. 14 Cottle: Dec. 15 - Feb. 14 Crane: Nov. 15 - Apr. 30 Crockett: Nov. 15 - Jan. 14, or Feb. 1- Mar. 30 Crosby: Nov. 15 - Apr. 30 Culberson: Nov. 1 - May 14 Dallam: Nov. 1 - Apr. 14, or Nov. 15 - Apr. 30 Dawson: Nov. 15 - Apr. 30 Deaf Smith: Nov. 15 - Apr. 30 Dickens: Nov. 15 - Jan. 14, or Feb. 1- Mar. 30 Dimmit: Dec. 15 - Feb. 14 Donley: Jan. 1- Mar. 30, or Dec. 1- Feb. 28 Eastland: Dec. 15 - Feb. 14 Ector: Nov. 15 - Apr. 30 Edwards: Dec. 15 - Feb. 14 El Paso: Jan. 1- Jul. 14, or May 15 - Jul. 31, or Jun. 1- Aug. 14, or Jun. 15 - Sept. 14, or Jul. 1- Oct. 14, or Jul. 15 - Oct. 31, or Aug. 1- Apr. 30, or Aug. 15 - May 14, or Sept. 1- May 30, or Oct. 1- Jun. 14, or Nov. 1- Jun. 30, or Nov. 15 - Jul. 14 Fisher: Dec. 15 - Feb. 14 Floyd: Nov. 15 - Apr. 30 Foard: Dec. 15 - Feb. 14 Gaines: Nov. 15 - Apr. 30 Garza: Nov. 15 - Apr. 30 Glasscock: Nov. 15 - Apr. 30 Hale: Nov. 15 - Apr. 30 Hall: Feb. 1- Mar. 30 Hansford: Nov. 15 - Apr. 30 Hardeman: Dec. 15 - Feb. 14 Hartley: Nov. 15 - Apr. 30 Haskell: Dec. 15 - Feb. 14 Hockley: Nov. 1- Apr. 14, or Nov. 15 - Apr. 30 Howard: Nov. 15 - Apr. 30 Hudspeth: Nov. 1 - May 14 Hutchinson: Nov. 15 - Apr. 30 Irion: Dec. 15 - Feb. 14 Jeff Davis: Nov. 1- Apr. 30 or Nov. 15 - May 14 Jones: Dec. 15 - Feb. 14 Kent: Nov. 15 - Jan. 14 or Feb. 1- Mar. 30 Kerr: Dec. 15 - Feb. 14 Kimble: Dec. 15 - Feb. 14 King: Dec. 15 - Feb. 14 Kinney: Dec. 15 - Feb. 14 Knox: Dec. 15 - Feb. 14 Lamb: Nov. 1 - Apr. 14, or Nov. 15 - Apr. 30 Page 43 Construction General Permit Loving: Nov. 1 - Apr. 30, or Nov. 15 - May 14 Lubbock: Nov. 15 - Apr. 30 Lynn: Nov. 15 - Apr. 30 Martin: Nov. 15 - Apr. 30 Mason: Dec. 15 - Feb. 14 Maverick: Dec. 15 - Feb. 14 McCulloch: Dec. 15 - Feb. 14 Menard: Dec. 15 - Feb. 14 Midland: Nov. 15 - Apr. 30 Mitchell: Nov. 15 - Apr. 30 Moore: Nov. 15 -Apr. 30 Motley: Nov. 15 - Jan. 14, or Feb. 1- Mar. 30 Nolan: Dec. 15 - Feb. 14 Oldham: Nov. 15 - Apr. 30 Parmer: Nov. 1- Apr. 14, or Nov. 15 - Apr. 30 Pecos: Nov. 15 - Apr. 30 Potter: Nov. 15 - Apr. 30 Presidio: Nov. 1- Apr. 30, or Nov. 15 - May 14 Randall: Nov. 15 - Apr. 30 Reagan: Nov. 15 - Apr. 30 Real: Dec. 15 - Feb. 14 Reeves: Nov. 1- Apr. 30, or Nov. 15 - May 14 Runnels: Dec. 15 - Feb. 14 Schleicher: Dec. 15 - Feb. 14 TPDES General Permit TXR150000 Scurry: Nov. 15 - Apr. 30 Shackelford: Dec. 15 - Feb. 14 Sherman: Nov. 15 - Apr. 30 Stephens: Dec. 15 - Feb. 14 Sterling: Nov. 15 - Apr. 30 Stonewall: Dec. 15 - Feb. 14 Sutton: Dec. 15 - Feb. 14 Swisher: Nov. 15 - Apr. 30 Taylor: Dec. 15 - Feb. 14 Terrell: Nov. 15 - Apr. 30 Terry: Nov. 15 - Apr. 30 Throckmorton: Dec. 15 - Feb. 14 Tom Green: Dec. 15 - Feb. 14 Upton: Nov. 15 - Apr. 30 Uvalde: Dec. 15 - Feb. 14 Val Verde: Nov. 15 - Jan. 14, or Feb. 1- Mar. 30 Ward: Nov. i - Apr. 14, or Nov. 15 - Apr. 30 Wichita: Dec. 15 - Feb. 14 Wilbarger: Dec. 15 - Feb. 14 Winkler: Nov. 1- Apr. 30, or Nov. 15 - May 14 Yoakum: Nov. i - Apr. 30, or Nov. 15 - May 14 Young: Dec. 15 - Feb. 14 Wheeler: Jan. 1- Mar. 30, or Dec. 1- Feb. 28 Zavala: Dec. 15 - Feb. 14 Page 44 Construction General Permit M TPDES General Permit TXR150000 Appendix B: Erosivity Index (EI) Zones in Texas W"M I FXX V V 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 (RUSLE)," U.S. Department of Agriculture, Agricultural Research Service Page 45 Construction General Permit TPDES General Permit TXR150000 Appendix C: Isoerodent Map 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 (RUSLE)," U.S. Department of Agriculture, Agricultural Research Service Page 46 El # 89 go 91 92 93 94 95 96 97 1o6 Construction General Permit TPDES General Permit TXR150000 Appendix D: Erosivity Indices for El Zones in Texas 7M. ". 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 ii and ends on December 31. Table 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 (RUSLE)," U.S. Department of Agriculture, Agricultural Research Service Page 47 iSWMTM Technical Manual Construction Controls 1 1 1 1.0 Overview of Construction Controls 2.0 Erosion Controls 3.0 Sediment Controls 4.0 Material Waste Controls iSWMTM Technical Manual Construction Controls Table of Contents 1.0 Overview of Construction Controls .................................... ..............................1 1.1 Introduction ..................................................................................................... ..............................1 1.2 Control Selection Guide .................................................................................. ..............................1 1.2.1 Erosion Control ......................................................................................... ..............................2 1.2.2 Sediment Control ...................................................................................... ..............................2 1.2.3 Material and Waste Control ...................................................................... ..............................4 1.3 Site Rating Calculation ................................................................................... ..............................5 1.3.1 Introduction ............................................................................—............... ............................... 5 1.3.2 Background .............................................................................................. ..............................5 1.3.3 Methodology ............................................................................................. ..............................5 1.3.4 Summary ................................................................................................. .............................12 2.0 Erosion Controls .............................................................................. .............................13 2.1 Check Dams .................................................................................................. .............................13 2.1.1 Primary Use ............................................................................................. .............................14 2.1.2 Applications ............................................................................................. .............................14 2.1.3 Design Criteria ........................................................................................ .............................14 2.1.4 Design Guidance and Specifications ...................................................... .............................16 2.1.5 Inspection and Maintenance Requirements ............................................ .............................16 2.1.6 Example Schematics ............................................................................... .............................17 2.2 Diversion Dike ................................................................................................ .............................21 2.2.1 Primary Use ............................................................................................. .............................22 2.2.2 Applications ........................................................................................... ............................... 22 2.2.3 Design Criteria ....................................................................................... ............................... 22 2.2.4 Design Guidance and Specifications .................................................... ............................... 23 2.2.5 Inspection and Maintenance Requirements ............................................ .............................23 2.2.6 Example Schematics ............................................................................... .............................24 2.3 Erosion Control Blankets ............................................................................. ............................... 26 2.3.1 Primary Use ............................................................................................. .............................27 2.3.2 Applications ........................................................................................... ............................... 27 2.3.3 Design Criteria ......................................................................................... .............................27 2.3.4 Design Guidance and Specifications ...................................................... .............................28 2.3.5 Inspection and Maintenance Requirements ............................................ .............................28 2.3.6 Example Schematics ............................................................................... .............................28 Overview CC -i Format Rev. 02/10 iSWMTM Technical Manual Construction Controls 2.4 Interceptor Swale ......................................................................................... ............................... 31 2.4.1 Primary Use ............................................................................................. .............................32 2.4.2 Applications ............................................................................................. .............................32 2.4.3 Design Criteria ......................................................................................... .............................32 2.4.4 Design Guidance and Specifications ...................................................... .............................33 2.4.5 Inspection and Maintenance Requirements ............................................ .............................33 2.4.6 Example Schematics ............................................................................. ............................... 34 2.5 Mulching ......................................................................................................... .............................35 2.5.1 Primary Use ............................................................................................. .............................36 2.5.2 Applications ........................................................................................... ............................... 36 2.5.3 Design Criteria ......................................................................................... .............................36 2.5.4 Design Guidance and Specifications .................................................... ............................... 38 2.5.5 Inspection and Maintenance Requirements ............................................ .............................38 2.5.6 Example Schematics ............................................................................. ............................... 39 2.6 Pipe Slope Drain ............................................................................................ .............................40 2.6.1 Primary Use ............................................................................................. .............................41 2.6.2 Applications ............................................................................................. .............................41 2.6.3 Design Criteria ......................................................................................... .............................41 2.6.4 Design Guidance and Specifications ...................................................... .............................42 2.6.5 Inspection and Maintenance Requirements ............................................ .............................42 2.6.6 Example Schematics ............................................................................... .............................43 2.7 Soil Surface Treatments ................................................................................ .............................44 2.7.1 Primary Use ............................................................................................. .............................45 2.7.2 Applications ............................................................................................. .............................45 2.7.3 Design Criteria ......................................................................................... .............................45 2.7.4 Design Guidance and Specifications ...................................................... .............................47 2.7.5 Inspection and Maintenance Requirements ............................................ .............................47 2.7.6 Example Schematics ............................................................................... .............................47 2.8 Turf Reinforcement Mats ............................................................................... .............................48 2.8.1 Primary Use ............................................................................................. .............................49 2.8.2 Applications ............................................................................................. .............................49 2.8.3 Design Criteria ......................................................................................... .............................49 2.8.4 Design Guidance and Specifications .................................................... ............................... 50 2.8.5 Inspection and Maintenance Requirements ............................................ .............................50 2.8.6 Example Schematics ............................................................................. ............................... 50 2.9 Vegetation ...................................................................................................... .............................53 Overview CC -ii Format Rev. 02/10 iSWMTA° Technical Manual Construction Controls 2.9.1 Primary Use ............................................................................................. .............................54 2.9.2 Applications ............................................................................................. .............................54 2.9.3 Design Criteria ......................................................................................... .............................54 2.9.4 Design Guidance and Specifications ...................................................... .............................58 2.9.5 Inspection and Maintenance Requirements ............................................ .............................58 2.9.6 Example Schematics ............................................................................. ............................... 59 2.10 Velocity Dissipation Devices .......................................................................... .............................60 2.10.1 Primary Use ............................................................................................. .............................61 2.10.2 Applications ............................................................................................. .............................61 2.10.3 Design Criteria ......................................................................................... .............................61 2.10.4 Design Guidance and Specifications ...................................................... .............................62 2.10.5 Inspection and Maintenance Requirements ............................................ .............................62 2.10.6 Example Schematics ............................................................................... .............................62 3.0 Sediment Controls .................................................................................. .............................64 3.1 Active Treatment System (ATS) .................................................................. ............................... 64 3.1.1 Primary Use ........................................................................................... ............................... 65 3.1.2 Applications ........................................................................................... ............................... 65 3.1.3 Design Criteria ......................................................................................... .............................65 3.1.4 Design Guidance and Specifications ...................................................... .............................68 3.1.5 Inspection and Maintenance Requirements ............................................ .............................68 3.1.6 Example Schematics ............................................................................. ............................... 69 3.2 Depressed Grade Sediment Trap ............................................................... ............................... 70 3.2.1 Primary Use ............................................................................................. .............................71 3.2.2 Applications ........................................................................................... ............................... 71 3.2.3 Design Criteria ....................................................................................... ............................... 71 3.2.4 Design Guidance and Specifications .................................................... ............................... 71 3.2.5 Inspection and Maintenance Requirements ............................................ .............................71 3.2.6 Example Schematics ............................................................................. ............................... 72 3.3 Dewatering Controls .................................................................................... ............................... 74 3.3.1 Primary Use ............................................................................................. .............................75 3.3.2 Applications ........................................................................................... ............................... 75 3.3.3 Design Criteria ......................................................................................... .............................75 3.3.4 Design Guidance and Specifications .................................................... ............................... 77 3.3.5 Inspection and Maintenance Requirements ............................................ .............................77 3.3.6 Example Schematics ............................................................................... .............................79 3.4 Inlet Protection ............................................................................................... .............................80 Overview CC -iii Format Rev. 02/10 iSWMTM Technical Manual Construction Controls Overview CC -iv Format Rev. 02/10 3.4.1 Primary Use ............................................................................................. .............................81 3.4.2 Applications ............................................................................................. .............................81 3.4.3 Design Criteria ......................................................................................... .............................81 3.4.4 Design Guidance and Specifications .................................................... ............................... 84 3.4.5 Inspection and Maintenance Requirements ............................................ .............................85 3.4.6 Example Schematics ............................................................................. ............................... 86 3.5 Organic Filter Berm ........................................................................................ .............................95 3.5.1 Primary Use ............................................................................................. .............................96 3.5.2 Applications ............................................................................................. .............................96 3.5.3 Design Criteria ....................................................................................... ............................... 96 3.5.4 Design Guidance and Specifications .................................................... ............................... 96 3.5.5 Inspection and Maintenance Requirements ............................................ .............................96 3.5.6 Example Schematics ............................................................................. ............................... 98 3.6 Organic Filter Tubes .................................................................................... ............................... 99 3.6.1 Primary Use ............................................................. ............................... ............................100 3.6.2 Applications ............................................................. ............................... ............................100 3.6.3 Design Criteria ......................................................... ............................... ............................100 3.6.4 Design Guidance and Specifications ...................... ............................... ............................102 3.6.5 Inspection and Maintenance Requirements ............. ............................... ...........................102 3.6.6 Example Schematics ........................................................................ ............................... ...103 3.7 Passive Treatment System (PTS) ................................. ............................... ............................105 3.7.1 Primary Use ............................................................. ............................... ............................106 3.7.2 Applications ............................................................. ............................... ............................106 3.7.3 Design Criteria ......................................................... ............................... ............................106 3.7.4 Design Guidance and Specifications ...................... ............................... ............................108 3.7.5 Inspection and Maintenance Requirements ............ ............................... ............................108 3.7.6 Example Schematics ............................................... ............................... ............................108 3.8 Pipe Inlet Protection ....................................................... ............................... ............................109 3.8.1 Primary Use ............................................................. ............................... ............................110 3.8.2 Applications ............................................................. ............................... ............................110 3.8.3 Design Criteria ......................................................... ............................... ............................110 3.8.4 Design Guidance and Specifications ...................... ............................... ............................110 3.8.5 Inspection and Maintenance Requirements ............ ............................... ............................111 3.8.6 Example Schematics ............................................... ............................... ............................112 3.9 Sediment Basin .............................................................. ............................... ............................114 3.9.1 Primary Use ............................................................. ............................... ............................115 Overview CC -iv Format Rev. 02/10 iSWMTm Technical Manual Construction Controls 3.9.2 Applications ............................................................. ............................... ............................115 3.9.3 Design Criteria ......................................................... ............................... ............................115 3.9.4 Design Guidance and Specifications ...................... ............................... ............................117 3.9.5 Inspection and Maintenance Requirements ............ ............................... ............................118 3.9.6 Example Schematics ............................................... ............................... ............................119 3.9.7 Design Procedures .................................................. ............................... ............................121 3.10 Silt Fence ............................................................................. ............................... ............................138 3.10.1 Primary Use ............................................................. ............................... ............................139 3.10.2 Applications ............................................................. ............................... :...........................139 3.10.3 Design Criteria ......................................................... ............................... ............................139 3.10.4 Design Guidance and Specifications ...................... ............................... ............................140 3.10.5 Inspection and Maintenance Requirements ............ ............................... ............................140 3.10.6 Example Schematics .................................................... ............................... .......................141 3.11 Stabilized Construction Entrance ........................................ ............................... ............................142 3.11.1 Primary Use ............................................................. ............................... ............................143 3.11.2 Applications ............................................................. ............................... ............................143 3.11.3 Design Criteria ......................................................... ............................... ............................143 3.11.4 Design Guidance and Specifications ...................... ............................... ............................144 a 3.11.5 Inspection and Maintenance Requirements ............ ............................... ............................144 3.11.6 Example Schematics ............................................... ............................... ............................145 3.12 Stone Sediment Trap ..................................................... ............................... ............................146 3.12.1 Primary Use ............................................................. ............................... ............................147 3.12.2 Applications ............................................................. ............................... ............................147 3.12.3 Design Criteria ......................................................... ............................... ............................147 3.12.4 Design Guidance and Specifications ...................... ............................... ............................148 3.12.5 Inspection and Maintenance Requirements ............ ............................... ............................148 3.12.6 Example Schematics ............................................... ............................... ............................149 3.13 Triangular Sediment Filter Dike ..................................... ............................... ............................151 3.13.1 Primary Use ............................................................. ............................... ............................152 3.13.2 Applications ............................................................. ............................... ............................152 3.13.3 Design Criteria ......................................................... ............................... ............................152 3.13.4 Design Guidance and Specifications ...................... ............................... ............................153 3.13.5 Inspection and Maintenance Requirements ............ ............................... ............................153 3.13.6 Example Schematics ............................................... ............................... ............................154 3.14 Turbidity Barriers ............................................................ ............................... ............................155 3.14.1 Primary Use ............................................................. ............................... ............................156 Overview CC -v Format Rev. 02/10 iSWMTm Technical Manual Construction Controls 3.14.2 Applications ............................................................. ............................... ............................156 3.14.3 Design Criteria ......................................................... ............................... ............................156 3.14.4 Design Guidance and Specifications ...................... ............................... ............................157 3.14.5 Inspection and Maintenance Requirements ............ ............................... ............................157 3.14.6 Example Schematics ............................................... ............................... ............................158 3.15 Vegetated Filter Strips and Buffers ................................ ............................... ............................159 3.15.1 Primary Use ............................................................. ............................... ............................160 3.15.2 Applications ............................................................. ............................... ............................160 3.15.3 Design Criteria ......................................................... ............................... ............................160 3.15.4 Design Guidance and Specifications ...................... ............................... ............................161 3.15.5 Inspection and Maintenance Requirements ............ ............................... ............................161 3.15.6 Example Schematics ............................................... ............................... ............................162 3.16 Wheel Cleaning Systems ............................................... ............................... ............................163 3.16.1 Primary Use ............................................................. ............................... ............................164 3.16.2 Applications ............................................................. ............................... ............................164 3.16.3 Design Criteria ......................................................... ............................... ............................164 3.16.4 Design Guidance and Specifications ...................... ............................... ............................165 3.16.5 Inspection and Maintenance Requirements ............ ............................... ............................166 3.16.6 Example Schematics ............................................... ............................... ............................167 4.0 Material and Waste Controls ........................... ............................... ............................170 4.1 Chemical Management .................................................. ............................... ............................170 4.1.1 Primary Use ............................................................. ............................... ............................171 4.1.2 Applications ............................................................. ............................... ............................171 4.1.3 Design Criteria ......................................................... ............................... ............................171 4.1.4 Design Guidance and Specifications ...................... ............................... ............................173 4.1.5 Inspection and Maintenance Requirements ............ ............................... ............................174 4.1.6 Example Schematics ............................................... ............................... ............................174 4.2 Concrete Sawcutting Waste Management .................... ............................... ............................175 4.2.1 Primary Use ............................................................. ............................... ............................176 4.2.2 Applications ............................................................. ............................... ............................176 4.2.3 Design Criteria ......................................................... ............................... ............................176 4.2.4 Design Guidance and Specifications ...................... ............................... ............................177 4.2.5 Inspection and Maintenance Requirements ............ ............................... ............................177 4.2.6 Example Schematics ............................................... ............................... ............................177 4.3 Concrete Waste Management ....................................... ............................... ............................178 4.3.1 Primary Use ............................................................. ............................... ............................179 Overview CC -vi Format Rev. 02/10 iSWMTm Technical Manual Construction Controls Overview CC -vii Format Rev. 02110 4.3.2 Applications ............................................................. ............................... ............................179 4.3.3 Design Criteria ......................................................... ............................... ............................179 4.3.4 Design Guidance and Specifications ...................... ............................... ............................180 4.3.5 Inspection and Maintenance Requirements ............ ............................... ............................180 4.3.6 Example Schematic ................................................. ............................... ............................182 4.4 Debris and Trash Management ..................................... ............................... ............................183 4.4.1 Primary Use ............................................................. ............................... ............................184 4.4.2 Applications ............................................................. ............................... ............................184 4.4.3 Design Criteria ......................................................... ............................... ............................184 4.4.4 Design Guidance and Specifications ...................... ............................... ............................186 4.4.5 Inspection and Maintenance Requirements ............ ............................... ............................186 4.4.6 Example Schematics ............................................... ............................... ............................186 4.5 Hyper - Chlorinated Water Management ......................... ............................... ............................187 4.5.1 Primary Use ............................................................. ............................... ............................188 4.5.2 Applications ............................................................. ............................... ............................188 4.5.3 Design Criteria ......................................................... ............................... ............................188 4.5.4 Design Guidance and Specifications ...................... ............................... ............................189 4.5.5 Inspection and Maintenance Requirements ............ ............................... ............................189 4.5.6 Example Schematics ............................................... ............................... ............................189 4.6 Sandblasting Waste Management ................................. ............................... ............................190 4.6.1 Primary Use ............................................................. ............................... ............................191 4.6.2 Applications ............................................................. ............................... ............................191 4.6.3 Design Criteria ......................................................... ............................... ............................191 4.6.4 Design Guidance and Specifications ...................... ............................... ............................192 4.6.5 Inspection and Maintenance Requirements ............ ............................... ............................192 4.6.6 Example Schematics ............................................... ............................... ............................192 4.7 Sanitary Waste Management ........................................ ............................... ............................193 4.7.1 Primary Use ............................................................. ............................... ............................194 4.7.2 Applications ............................................................. ............................... ............................194 4.7.3 Design Criteria ......................................................... ............................... ............................194 4.7.4 Design Guidance and Specifications ...................... ............................... ............................194 4.7.5 Inspection and Maintenance Requirements ............ ............................... ............................194 4.7.6 Example Schematic ................................................. ............................... ............................194 4.8 Spill and Leak Response Procedures ............................ ............................... ............................195 4.8.1 Primary Use ............................................................. ............................... ............................196 4.8.2 Applications ............................................................. ............................... ............................196 Overview CC -vii Format Rev. 02110 iSWMTm Technical Manual Construction Controls 4.8.3 Design Criteria ......................................................... ............................... ............................196 4.8.4 Design Guidance and Specifications ...................... ............................... ............................197 Sediment Controls ................................................................................ ............................... 4.8.5 Inspection and Maintenance Requirements ............ ............................... ............................197 Material and Waste Controls ................................................................. ..............................4 4.8.6 Example Schematics ............................................... ............................... ............................197 Maximum Soil Loss from Construction Site .......................................... ..............................6 4.9 Subgrade Stabilization Management ............................. ............................... ............................198 Table 1.5 4.9.1 Primary Use ............................................................. ............................... ............................199 Table 1.6 4.9.2 Applications ............................................................. ............................... ............................199 Table1.7 4.9.3 Design Criteria ......................................................... ............................... ............................199 Table 2.1 4.9.4 Design Guidance and Specifications ...................... ............................... ............................199 Table 2.2 4.9.5 Inspection and Maintenance Requirements ............ ............................... ............................200 Table 2.3 4.9.6 Example Schematic ................................................. ............................... ............................200 Table 2.4 4.10 Vehicle and Equipment Management ............................ ............................... ............................201 57 4.10.1 Primary Use ............................................................. ............................... ............................202 4.10.2 Applications ......................................•...................... ............................... ............................202 4.10.3 Design Criteria ......................................................... ............................... ............................202 4.10.4 Design Guidance and Specifications ...................... ............................... ............................203 CC -viii 4.10.5 Inspection and Maintenance Requirements ............ ............................... ............................204 4.10.6 Example Schematics ............................................... ............................... ............................204 List of Tables Table1.1 Erosion Controls .................................................................................... ..............................2 Table1.2 Sediment Controls ................................................................................ ............................... 3 Table 1.3 Material and Waste Controls ................................................................. ..............................4 Table 1.4 Maximum Soil Loss from Construction Site .......................................... ..............................6 Table 1.5 Soil Erodibility Factors ( K) ..................................................................... ..............................7 Table 1.6 Length /Slope Factor ( LS) ..................................................................... ............................... 9 Table1.7 Cropping Factors .................................................................................. .............................10 Table 2.1 Pipe Slope Drain Minimum Diameters ................................................. .............................41 Table 2.2 Recommended Grass Mixture for Temporary Erosion Control ......... ............................... 56 Table 2.3 Recommended Grass Mixture for Final Stabilization of Upland in Rural Areas ...............57 Table 2.4 Recommended Grass Mixture for Final Stabilization of Upland in Urban Areas .............. 57 Table 3.1 Perimeter Control Applications" ........................... ............................... ............................101 Table 3.2 Maximum Spacing for Slope Protection ............... ............................... ............................101 Table 3.3 Sediment Basin Effectiveness for Different Soil Types ....................... ............................115 Overview CC -viii Format Rev. 02/10 iSWMTm Technical Manual Construction Controls Table 3.4 Number and Spacing of Anti -Seep Collars .......... ............................... ............................117 Table 3.5 Pipe Flow Chart, n =0.013 .................................... ............................... ............................126 Table 3.6 Pipe Flow Chart, n =0.025 .................................... ............................... ............................127 Table 3.7 Design Data For Earth Spillways ......................... ............................... ............................129 Table 3.8 Trash Rack and Anti -Vortex Device Design Table ............................. ............................133 Table 3.9 Minimum Entrance Dimensions ........................... ............................... ............................144 Table 4.1 Chemical Dechlorination Agents and Dosages ... ............................... ............................189 List of Figures Figure 3.1 Basin Outlet Design ............................................. ............................... ............................124 Figure 3.2 Riser Inflow Curves .............................................. ............................... ............................125 Figure 3.3 Excavated Earth Spillway .................................... ............................... ............................128 Figure 3.4 Anti -Vortex Design ............................................... ............................... ............................132 Figure 3.5 Riser Pipe Base Design for Embankment Less Than 10 Feet High ... ............................134 Overview CC -ix Format Rev. 02/10 iSWMTM Technical Manual Construction Controls 1.0 Overview of Construction Controls 1.1 Introduction In order to address the requirements of pollution reduction at construction sites, a variety of controls should be employed to reduce soil erosion, reduce site sediment loss, and manage construction - generated waste and construction related toxic materials. Controls consist of both temporary and permanent methods to reduce pollution from a construction site. The majority of controls address soil loss from the site. For construction sites, soil loss in the form of erosion and sediment due to storm events and wind constitute the majority of pollution generated from construction sites. 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 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 In preparing the iSWM Construction Plan, the designer can first use the control selection guide on the following pages to determine the controls that are most appropriate for the site. The Chapters 2.0, 3.0 and 4.0 contain the design requirements, maintenance requirements, limitations, and purpose of each of the controls. These provide the tools for the designer to select the appropriate controls and properly locate them on the site, effectively reducing erosion and sediment loss. The Efficiency Ratings listed for the controls are the 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. Actual removal efficiency will vary based on soil type. The ratings are useful in comparing the effectiveness of the controls. The Efficiency Rating is also used in calculating the Site Rating, which is used by some local governments to ensure adequate design of erosion and sediment controls. The following legend applies to the Targeted Constituents and Pollutant Removal information for each of the controls: Legend • Significant Impact G Medium Impact 0 Low Impact ? Unknown or Questionable Impact Overview CC -1 Format Rev. 02/10 iSWMTm Technical Manual Construction Controls 1.2.1 Erosion Control These controls protect the soil to reduce erosion. They are primarily used in perimeter areas around construction sites to either limit flows across the site or limit the erosion in areas disturbed but not active. Table 1.1 Erosion Controls control Primary Purpose Eflicieacy Rating (Fe) Interceptor Swale Route flows around areas of disturbance 1.0 Diversion Dike Route flows around areas of disturbance 1.0 Pipe Slope Drain Route overland flow on a slope into a pipe to Varies protect the slope Vegetation Provide natural soil protection through 0.90 seeding, h dromulch or phasing Mulching Protect disturbed soil with a layer of hay, 0.90 straw, or other material Erosion Control Protect disturbed soil or slopes with geotextile 0.90 Blankets and biodegradable fabrics Soil Surface Techniques to limit wind erosion and air- Varies Treatments borne soil particles from leaving site Provide minor detention and retention of Check Dam sediment for small swales and concentrated 0.40 flows Turf Reinforcement Protect disturbed soils on steep slopes and in 0.90 Mats channels Velocity Dissipation Protect soil from erosion at points where N/A Devices concentrated flows are discharged The Efficiency Ratings listed for the controls are the assumed average efficiencies in reducing erosion or trapping sediment for a range of soil types, assuming the controls are designed and installed in accordance with the criteria in this manual for the flow and volumes from the design storm. 1.2.2 Sediment Control Construction activities normally result in disturbance on the site due to grading operations, clearing and other operations. Erosion will occur in these disturbed areas and controls must be used to contain the sediment from these disturbed areas. The following techniques reduce soil loss from the site by retaining the soil through sedimentation or filtration of the runoff. The effectiveness of controls that form a barrier or filter for trapping soil is highly dependent on the size of soil particles. The efficiencies presented here are averages for a range of soil type. The designer shall use judgment in applying them based on the site conditions. Generally, the removal efficiency will be higher than average for coarse silt and sand and lower than average for fine silt and clay. Overview CC -2 Format Rev. 02/10 iSWMT"° Technical Manual Construction Controls Table 1.2 Sediment Controls Control Primary Purpose Efficiency Rating (Fe) Silt Fence Slow and filter runoff to retain sediment 0.75 Organic Filter Berm Slow and filter runoff to retain sediment 0.75 Triangular Sediment Similar to silt fence but more portable, 0.75 Filter Dike reusable and sturdy with high flows Intercept sediment at curb and field inlets. Inlet Protection Should be used in conjunction with other Varies onsite techniques Stone Outlet Sediment Intercept and filter small concentrated flows 0.85 Trap such as small creeks and defined waterways Sediment Basin Large pond with controlled outflow which 0.90 allows sediment to settle out of runoff Temporary Sediment Provide sedimentation for sediment laden 0.70 Tank runoff from trenches and depressed areas Stabilized Reduce offsite sediment tracking from trucks N/A Construction Entrance and construction equipment Wheel Cleaning Reduce offsite sediment tracking from trucks N/A Systems and construction equipment Remove pollutants and suspended soil from Active Treatment stormwater, including fine clay particles, 0.90 -0.99 Systems through filtration or chemical -aided flocculation Depressed Grade Detain and settle suspended soil from small 0.75 Sediment Trap areas within rights -of -way Dewatering Controls Provide suspended soil removal from water Varies that is pumped out of low points on site Organic Filter Tubes Slow and filter runoff to retain sediment 0.75 Passive Treatment Add chemical -aided flocculation to traditional System sediment barriers and filters to remove fine 0.90 silt and clay soil particles Pipe Inlet Protection Detain and filter stormwater for sedimentation Varies before it enters a closed conveyance system Turbidity Barrier Detain and settle suspended soil where work 0.75 is occurring in or adjacent to a water body The Efficiency Ratings listed for the controls are the assumed average efficiencies in reducing erosion or trapping sediment for a range of soil types, assuming the controls are designed and installed in accordance with the criteria in this manual for the flow and volumes from the desiqn storm. Overview CC -3 Format Rev. 02/10 iSWMTM Technical Manual 1.2.3 Material and Waste Control Construction Controls These techniques will be applied on the majority of construction projects due to their general topic of reducing the discharge of pollutants from construction activities. They form the basis of general housekeeping procedures that should be followed during construction and in many cases are mandated by stormwater discharge permits. The techniques are essential to preventing the discharge of pollutants other than sediment from a construction site. A numeric efficiency rating is not provided, since the controls are not for erosion and sediment and are not a factor in the Site Rating calculation. Table 1.3 Material and Waste Controls Control Primary Propose Efltctency Raft (Fe) Debris and Trash Techniques for management of paper, Very Effective Management packaging, general building materials, etc. Chemical Management Techniques for management of paints, Very Effective chemicals, fertilizer, oil and grease, etc. Concrete Waste Techniques for disposal of concrete washout, Very Effective Management demolished concrete, etc. Concrete Sawcutting Techniques for disposal of concrete cuttings Effective Waste Management from concrete sawing Sandblasting Waste Techniques for disposal of sandblasting Effective Management waste and containment of wastes during operations Subgrade Stabilization Techniques to control runoff from soil being Effective Management chemically stabilized in preparation for construction Sanitary Waste Techniques for control of sanitary waste Effective Management Techniques to prevent water with high Effective Hyper - Chlorinated concentrations of chlorine for distribution Water Management system disinfection from being discharged to surface water Spill and Leak Techniques for minimizing the impacts of a Very Effective Response Procedures discharge from spills or leaks Vehicle and Techniques for management of vehicle Very Effective Equipment washing, fueling and maintenance Management Overview CC4 Format Rev. 02/10 iSWM TM Technical Manual Construction Controls 1.3 Site Rating Calculation 1.3.1 Introduction The site rating calculation methodology is an optional element for an iSWM Construction Plan; however, some municipalities in North Central Texas may require its use. The site rating provides numeric criteria for design of erosion and sediment controls for a construction site. Municipalities that use the 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% using controls compared to the same site without the use of controls. The user of this manual is advised to check with the municipality where the project is located to determine local requirements. When required to provide the site rating by the local government, the iSWM Construction Plan should be prepared as described in Chapter 4 of the iSWM Criteria Manual, followed by calculation of the site rating. Controls shall then be modified and add as needed to achieve the minimum required site rating. 1.3.2 Background The design and implementation of erosion and sediment controls is highly dependent on project site conditions and construction methods. The amount of potential soil loss from a site is based on the physical features and location of the site: soil type(s), slope, length of stormwater flow across the site, the rainfall intensity and overall runoff quantity of a particular storm and the groundcover of the site. Of these factors, construction activity at a site can affect the groundcover, the slope of the site and the length of stormwater flow across the site. The primary methods of soil control consist of minimizing onsite disturbance of the soil and groundcover and providing structural measures to retain sediment onsite after erosion occurs. By far, the most effective method to reduce the sediment lost from a tract of land is to prevent the occurrence of erosion. While structural barriers, such as those shown in this manual, have a theoretical 70 to 90 percent effectiveness rating for removal of sediment from runoff, natural groundcover and mulching can 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 protect the soil from erosion and minimize the area of disturbance through the phasing of construction activities, mulching of disturbed but inactive areas, and providing tarps, seeding or hydromulching of stockpiles. These techniques are not only the most effective at reducing soil loss; they are normally the most cost effective due to low initial cost and reduced maintenance requirements. Sediment removal controls are the second line of defense, treating sediment -laden stormwater prior to it leaving the site. All construction activities will require areas in which soil is disturbed. Stormwater runoff that crosses areas of exposed soil will require treatment by adequate Best Management Practices in accordance with the guidelines presented in this manual. 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 erosion. This quantity is estimated through the use of the Universal Soil Loss Equation as a mass per time period. Erosion prevention and sediment removal Best Management Practices are used to reduce the sediment transported offsite to an acceptable level. Overview CC -5 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls The site rating is defined as the theoretical amount of soil that remains uneroded and /or is captured on a site through the use of erosion prevention and sediment control practices (soil retained) divided by the theoretical amount of soil that would leave the site if no controls were used (uncontrolled). As discussed in the Introduction, a minimum site rating of 0.70 is typically used as a guideline for the adequate design of erosion and sediment control systems. This site rating is calculated as follows: SR = ZAretained / Zkncontrolled where: (1.1) SR = Site Rating ZArerained = Soil uneroded and /or retained on site by erosion prevention and sediment control practices (pounds /year) Zk..nt.11ed = Soil loss from site if no controls used (pounds /year) Note that the site rating methodology calculation assumes that the erosion and sediment control 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 defined design storm for construction site stormwater runoff control. In addition to an acceptable site ratio of 0.70, Table 1.4 lists the maximum rates of soil loss from a site during construction activities. These values are recommended maximums based on site slope and are subject to change by the local jurisdiction due to potential downstream impacts or historical erosion problems for the site. Table 1.4 Maximum Soil Loss from Construction Site Slope Site Sedknent Loss (Tons/Acre/Year) <1% 7.5 1 -3% 14 3 -5% 30 > 5% 40 These criteria are presented for a general guide. Specific criteria can be established by the municipality for use within their jurisdiction or on a specific site basis. Universal Soil Loss Equation Several elements are involved in evaluating the potential for erosion of a site. Soil type, length of flow across the ground, slope of ground, rainfall intensity and groundcover play important roles in determining if a site will produce excessive silt downstream. In order to address the erodibility of a site, the Universal Soil Loss Equation is used to determine the potential erodibility of the site. The Universal Soil Loss Equation (USLE) is expressed as: Z = R *K *LS *Cs *P *Sd (1.2) where: Z = Rate of soil loss (tons per acre per year) R = Rainfall erosion factor (300 for North Texas) K = Soil erodibility factor LS = Length /slope factor Overview CC -6 Format Rev. 02/10 iSWMTM Technical Manual CS = Cropping /management factor P = Erosion control practice Sd = Sediment delivery ratio (assumed to be 1) To calculate the anticipated yearly soil loss (ZA) ZA= Z *A where ZA = Soil Loss per year (tons per year) Z = Rate of Soil Loss for a drainage basin A = Area of drainage basin (Acres) Construction Controls (1.3) Some of the factors above (R and K) remain constant throughout the construction of the project. Both the LS and Cs factors are altered during construction through clearing, grading and drainage operations on the site. The P factor represents the implementation of erosion and sediment controls to reduce the potential for sediment to be transported offsite. A discussion of the factors follows. Rainfall Erosion Factor An 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. In some regions, most of the annual erosion occurs in a 3 month period. For the North Central Texas area, a value of 300 is used for R. Soil Erodibility Factor The K factor relates to the potential erodibility of the soil. Table 1.5 provides approximate values of K for various soil types and can be used in calculations if detailed data is not available. It is strongly suggested that soil erodibility be determined as part of the geotechnical investigation of the site in order to determine the most effective means to reduce site erosion. Table 1.5 Soil Erodibility Factors (K) Solt T K Sand 0.03 Fine Sand 0.14 Loamy Sand 0.10 Sandy Loam 0.24 Loam 0.34 Silt Loam 0.42 Silt 0.52 Sandy Clay Loam 0.25 Clay Loam 0.25 Silty Clay Loam 0.32 Sandy Clay 0.13 Silty Clay 0.23 Clay 0.20 based on Environmental Engineering Handbook Overview CC -7 Format Rev. 02/10 l iSWMTm Technical Manual Length /Slope Factor Construction Controls The length -slope (LS) of the drainage basin may be changed through construction operations. This reduction in slope or drainage length can significantly reduce the erosion potential of the drainage basin. The length -slope (LS) factor considers the topographic features of the drainage basin. The LS factor is 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 1.6 lists values of LS for a wide variety of slope and drainage length. LS can also be calculated as follows: LS = [U72.6]"*[65.41 *sin2(S) + 4.56 *sin(S) + 0.065] (1.4) where: L = Length of flow path of contributing area, feet M = 0.6 * [1 - exp(- 35.835 *s)] where s= slope, feettfeet S = Average slope of contributing area (degrees) Overview Format Rev. 02110 CC -8 m 2 t 0 C-) c 0 2 v C O tC cc Aa 'I III 'oI'I INIMMINNIMMMMIN mwwwwwwwwmwmmmm 9 I > 0 0 U- 111 �����o INIMMINNIMMMMIN mwwwwwwwwmwmmmm 9 I > 0 0 U- r iSWMTM Technical Manual Construction Controls Cropping /Management Factor The cropping factor (Cs) considers the protection of natural ground cover in preventing erosion of the soil. This is dependent on the type of vegetation (grass or trees) and the density of the vegetation on the site. The higher the value for C, the less protection from erosion is available; for example, a bare construction site with no groundcover has a C value of 1.0 while hay mulch applied at 1 ton per acre produces a C value of 0.13. The C, factor is not intended to account for the reduced erosion provided for by temporary or permanent vegetation established on areas that have been disturbed. The erosion control factor, P, described below reflects this erosion protection afforded by use of vegetation in accordance with the Subsection 2.9 (Vegetation). Table 1.7 provides approximate values for C, for a variety of conditions. The sensitivity of the Cs value reflects the importance of minimizing the area of disturbance and providing protection to the disturbed soil before erosion occurs. For existing bare areas or areas stripped of natural vegetation by construction, a CS value of 1.0 shall be used. Table 1.7 Cropping Factors Type and HeW Canopy of Ralsed Cow., Ground cover that contacts the surface, % Vegetative Canopy % 0 20 40 60 80 95 -100 No appreciable 0 0.450 0.200 0.100 0.042 0.013 0.003 25 0.360 0.170 0.090 0.038 0.012 0.003 canopy/ Canopy of tall weeds or short 50 0.260 0.130 0.070 0.035 0.012 0.003 75 1 0.170 0.100 0.060 0.031 1 0.011 0.003 brush <l' tall Appreciable 25 0.400 0.180 0.090 0.040 0.013 0.003 brush or bushes 50 0.340 0.160 0.085 0.038 0.012 0.003 (5' fall height) 75 0.280 0.140 0.080 0.036 0.012 0.003 Trees w/o 25 0.420 0.190 1 0.100 1 0.041 0.013 1 0.003 appreciable low 50 1 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 based on Environmental Engineering Handbook For each drainage basin, this C, value is weighted based on the percentage of disturbed area in the basin: Cstotal = UCs.. *A.J + (Csdis *Adis)1 / Atotal (1.5) where: Cstotai = Cs for drainage basin Cs,,,, = C, for undisturbed areas A,,,, = Area of undisturbed areas of drainage basin (acres) Csd;s = Cs for disturbed areas Adis = Area of disturbed areas of drainage basin (acres) Atata, = Total Area of drainage basin (acres) Overview CC -10 Format Rev. 02110 iSWMTm Technical Manual Construction Controls Erosion Control Practice Factor 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 permanent vegetation, sediment basins, filter berms, check dams, and other Best Management Practices. For the calculation of the uncontrolled soil loss from the site (ZAwcontroued), a P value of 1 is used in the USLE since it is assumed that no controls are used. For the calculation of the soil erosion prevented /sediment retained on the site (ZAretained), the Efficiency Rating (Fe) for the various controls in the iSWM Technical Manual is used in place of the erosion control practice factor. The Efficiency Rating is the compliment of the P value (Fe = 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. For multiple structural controls used in series to treat runoff from disturbed areas, the design efficiency can be calculated as follows': FeTOTAL = 1- ((1- Fet)"(1 -Fez)) where: Fe1 = Removal efficiency of first control Fee = Removal efficiency of second control Sediment Delivery Ratio The sediment delivery ratio, Sd, approximates the amount of sediment discharged from a site based on the drainage density of the site. The drainage density is defined as the area of drainage divided by the length of drainage flow. For purposes of the calculations presented in this manual, Sd is assumed to be 1.0, and can therefore be dropped from the calculation. Site Rating Factor Calculation After erosion potential is calculated for both uncontrolled and controlled conditions, a site factor is developed. As shown earlier in this discussion, the site rating is calculated as follows: SR = ZAretained / Zkncontrolled where: (1.7) SR = Site Rating ZAretained = Soil uneroded and /or retained on site by erosion prevention and sediment control practices (pounds /year) ZA„ncontrolled = Soil loss from site if no controls used (pounds /year) For the purposes of design for structural sediment control techniques, a minimum design storm of 2 -year intensity and 24 -hour duration shall be used. Other design criteria are defined in the construction control fact sheet 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. The local jurisdiction can adjust this requirement for particularly sensitive areas or other areas of concern. 1 Hartigan, P. and K Jf'ihveding, 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 -11 Format Rev. 02/10 iSWMTA4 Technical Manual 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 CS values and drainage patterns (LS) based on conditions for design period Show drainage divides and calculations on SWPPP Construction Controls 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 III. Calculate theoretical soil uneroded and /or retained for each sub -basin by use of controls Use Fe from Construction Control Fact Sheets (or test/manufacturer's data) in place of P in LISLE Calculate soil retained on site due to use of controls IV. Determine site rating Total sediment loss from the site must be reduced by minimum of 70 percent from uncontrolled conditions (Site Rating > 0.70). For sites that include phasing of the construction, repeat the steps for each phase. Overview CC -12 Format Rev. 02/10 iSWMTM Technical Manual 2.0 Erosion Controls 2.1 Check Dams Construction Controls Erosion Control Check Dams CC -13 Format Rev. 02/10 Flow Description: Check dams are small --- barriers consisting of loose rock, rock Spacing P 9 bags, or organic filter tubes placed across a drainage swale or ditch. - 0' They the reduce velocity of small i concentrated flows, provide a limited barrier for sediment and reduce the potential for erosion of the swale or ditch. KEY CONSIDERATIONS APPLICATIONS DESIGN CRITERIA: Perimeter Control • Heights between 18 inches and 36 inches • Top of the downstream dam should be at the same Slope Protection elevation as the toe of the upstream dam Sediment Barrier Channel Protection ADVANTAGES /BENEFITS: • Reduced velocities in long drainage swales or ditches Temporary Stabilization • May be used with other channel protection measures Final Stabilization • Provides some sediment removal Waste Management DISADVANTAGES / LIMITATIONS: Housekeeping Practices • Cannot be used in live stream channels Fe =0.40 • Minor ponding upstream of the check dams • Extensive maintenance or replacement of the dams required after heavy flows or high velocity flows II�LEMENTATION • Mowing hazard from loose rocks if all rock is not removed CONSIDERATIONS at end of construction G Capital Costs MAINTENANCE REQUIREMENTS: C Maintenance • Inspect regularly O Training • Remove silt when it reaches approximately Y the height of the dam or 12 inches, whichever is less p Suitability for Slopes > 5% Other Considerations: POLLUTANT REMOVAL None C Sediment O Nutrients & Toxic Materials O Oil & Grease G Floatable Materials O Other Construction Wastes Check Dams CC -13 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls 2.1.1 Primary Use 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 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 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. 2.1.2 Applications Check dams are typically used in swales and drainage ditches along linear projects such as roadways. They can also be used in short swales down a steep slope, such as swales down a highway embankment, to reduce velocities. Check dams shall not be used in live stream channels. Check dams should be installed before the contributing drainage area is disturbed, so as to mitigate the 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. 2.1.3 Design Criteria General Criteria • Typically, 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 the channel. • Dams should be spaced such that the top of the downstream dam is at the same elevation as the toe 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. • The top of the side of the check dam shall be a minimum of 12 inches higher than the middle of the dam. In addition, the side of the dams shall be embedded a minimum of 18 inches into the side of the drainage ditch, swale or channel to minimize the potential for flows to erode around the side of the dam. • Larger flows (greater than 2 -year, 24 -hour design storm) must pass the check dam without causing excessive upstream flooding. • Check dams should be used in conjunction with other sediment reduction techniques prior to releasing flow offsite. • Stone shall be well graded with size range from 1 %2 inches to 3' /z inches in diameter depending on the expected flows. • Use geotextile filter fabric under check dams of 12 inches in height or greater. The fabric shall meet the following minimum criteria: • Tensile Strength, ASTM D4632 Test Method for Grab Breaking Load and Elongation of Geotextiles, 250 -Ibs. • Puncture Rating, ASTM D4833 Test Method for Index Puncture Resistance of Geotextiles, Geomembranes, and Related Products, 135 -Ibs. • Mullen Burst Rating, ASTM D3786 Standard Test Method for Hydraulic Bursting Strength of Textile Fabrics - Diaphragm Bursting Strength Tester Method, 420 -psi. • Apparent Opening Size, ASTM D4751 Test Method for Determining Apparent Opening Size of a Geotextile, U.S. Sieve No. 20 (max). Check Dams CC -14 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls • Soil, mulch, and compost shall not be used to construct check dams. Straw, aspen fiber and other organic material that is primarily cellulose may be used if contained within organic filter tubes. Rock Check Dams • Stone shall be well graded with a minimum size range from 3 to 6 inches in diameter for a check dam height of 24 inches or less. The minimum size range for check dams greater than 24 inches is 4 to 8 inches in diameter. • Rock check dams shall have a minimum top width of 2 feet with side slopes of 2:1 or flatter. Rock Bag Dams • 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 be 6 inches to 8 inches and having a minimum weight of 40 pounds. • Minimum rock bag dam height of 12 inches would consist of one row of bags stacked on top of two rows of bag. The dam shall always be one more row wide than it is high, stacked pyramid fashion. • Bags should be filled with pea gravel, filter stone, or aggregate that is clean and free of deleterious material. • Sand bags shall not be used for check dams, due to their propensity to break and release sand that is transported by the concentrated flow in the drainage swale or ditch. • 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 ASTM D3786 Standard Test Method for Hydraulic Bursting Strength of Textile Fabrics - Diaphragm Bursting Strength Tester Method, and ultraviolet stability exceeding 70 percent. • 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 inches. Sack Gabions Check Dams • Sack gabions 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 minimum 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 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. • Tubes filled with compost shall not be used for check dams. • 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. • Filter tubes and the filter material shall comply with the criteria in the Organic Filter Tubes Fact Sheet Check Dams CC -15 Format Rev. 02/10 f iSWMTm Technical Manual Construction Controls of the iSWM Technical Manual. 2.1.4 Design Guidance and Specifications Specifications for construction of this item may be found in the Standard Specifications for Public Works Construction — North Central Texas Council of Governments, Section 201.9 Check Dam (Rock) and Section 201.10 Check Dam (Sand Bag). Specifications are also available in the Standard Specifications for Construction and Maintenance of Highways, Streets, and Bridges (TxDOT 2004), Item 506.2.A and Item 506.4.C.1. 2.1.5 Inspection and Maintenance Requirements Check dams should be inspected regularly (at least as often as required by the TPDES Construction General Permit). Silt must be removed when it reaches approximat* the height of the dam or 12 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 shall be repaired. If erosion continues to be a problem, modifications to the check dam or additional controls are needed. Care must be used when taking out rock check dams in order to remove as much rock as possible. Loose rock can create an extreme hazard during mowing operations once the area has been stabilized. Check Dams CC -16 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls 2.9.6 Example Schematics 1.5' TC 1.5 I FLOW 1.6 To ORIC L TOE OF CHECK DAM r TOP OF CHECK DAM SPACING BETWEEN ROCK CHECK DAMS N.T.S. NOTES: ACTUAL DIMENSIONS OF THE CHECK DAMS SHALL BE DESIGNED BASED ON FLOW CONDITIONS IN THE DRAINAGE SWALE OR DITCH. PROVIDE CALCULATIONS THAT DOCUMENT THE FOLLOWING PARAMETERS USED TO DESIGN THE CHECK DAMS. •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 Source: Modlfuel from Stonowater Management Manual fur Western Wastimgmn Check Dams CC -17 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls SAND BAG OR GRAVEL BAG i 1• 1.5T03' ' ` 2' DIA PVC ON FILTER FABRIC 4 FT SPACING (MIN OF 2) FILTER TURF CHECK DAM VIEW LOOKING UPSTREAM N.T.S. Y DIA PVC ON 18" MIN 4 FT SPACING (MIN OF 2) FLOW 1.5' TO T FILTER FABRIC 8 CROSS SECTION OF ROCK CHECK DAM N.T.S. L TOE OF CHECK F ` ' DAM TOP OF CHECK DAM _2EAC1ND_flfMYEEN! ROCK CIAECK DAMS N.T.S. NOTES: ACTUAL DIMENSIONS OF THE CHECK DAMS SHALL BE DESIGNED BASED ON FLOW CONDITIONS IN THE DRAINAGE SWALE OR DITCH. PROVIDE CALCULATIONS THAT DOCUMENT THE FOLLOWING PARAMETERS USED TO DESIGN THE CHECK DAMS. -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. Source: Modified from Skwwater Menegement Manuel for Western WaddngM Check Dams CC -18 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls SACK GABIONS FILTER TURF CHECK DAM VIEW LOOKING UPSTREAM N.T.S. 314 ' DIA REBAR SACK GABIONS STAKES CROSS SECTION OF ROCK CHECK DAM N.T.S. 4' t a f GALVANIZED STEEL WIRE MESH SACK GABION DETAIL N.T.S. Source: Texas Department of Traneporladon Det®A Sheet EC (2) -93 Check Dams CC -19 Format Rev. 02/10 FLOW SACK GABIONS FILTER TURF CHECK DAM VIEW LOOKING UPSTREAM N.T.S. 314 ' DIA REBAR SACK GABIONS STAKES CROSS SECTION OF ROCK CHECK DAM N.T.S. 4' t a f GALVANIZED STEEL WIRE MESH SACK GABION DETAIL N.T.S. Source: Texas Department of Traneporladon Det®A Sheet EC (2) -93 Check Dams CC -19 Format Rev. 02/10 iSWMTm Technical Manual Construction Controls 2" x 2" WOOD FILTER TUBE DOWNSTREAM SIDE STAKES MAX 4' (12- MIN OF FILTER TUBE _ THROUGH SPACING DIAMETER) FILTER TUBE FILTER TUBE CHECK DAM VIEW LOOKING UPSTREAM N.T.S. L TOE OF ORGANIC FILTER TUBE FLOW CHECK (12" MIN DIA.) DAM TOP OF CHECK DAM SEE EMBEDMENT DETAIL FILTER TUBE CHECK DAM PROFILE N.T.S. 2"x 2' WOOD STAKES THROUGH TUBE (E(TEND 2- MAX ABOVE TOP OF TUBE) MAX 4' SPACING FOR ALL STAKES ORGANIC FILTER TUBE (12- MIN DIA) 2"x 2" WOOD STAKES i. DOWNSTREAM OF TUBE F� w 9"- 20" PER DESIGN CALCULATIONS MINIMUM 3' EMBEDMENT 12"MINIMUM L1 EMBEDMENT DETAIL FOR FILTER TUBE CHECK DAM N.T.S. NOTES: ACTUAL DIMENSIONS OF THE CHECK DAMS SHALL BE DESIGNED BASED ON FLOW CONDITIONS IN THE DRAINAGE SWALE OR DITCH. PROVIDE CALCULATIONS THAT DOCUMENT THE FOLLOWING PARAMETERS USED TO DESIGN THE CHECK DAMS. *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. Same: Modified from City or Ptaw BMP S-7 Check Dams CC -20 Format Rev. 02/10 iSWMTM Technical Manual 2.2 Diversion Dike Construction Controls Erosion Control Groundcover (Established as soon as Possible) Description: A diversion dike is a compacted soil mound, which redirects �a Mo. Flow runoff to a desired location. The dike �� Soirwa is typically stabilized with natural grass �l, 4, '� A'ib1"�,+��rh o„ Nfa „�,L. L -• for low velocities or with stone or eG f�/ c� /'d,�',dA"R'd „��rY����//,Na erosion control mats for higher stabiRZon velocities. KEY CONSIDERATIONS APPLICATIONS DESIGN CRITERIA: Perimeter Control Maximum 1 foot flow depth at the dike for a 2 -year Slope Protection return period design storm peak flow • Side slopes 3:1 or flatter Sediment Barrier • Minimum 2 feet top width Channel Protection • Minimum embankment height of 18 inches measured Temporary Stabilization from toe of slope on upgrade side • Maximum contributing drainage area of 5 acres or less Final Stabilization Waste Management ADVANTAGES / BENEFITS: • Easy to install during early grading operations Housekeeping Practices • Very effective in'reducing erosion at a reasonable cost • Can be used in combination with an interceptor swale Fe =N /A DISADVANTAGES / LIMITATIONS: • Must be stabilized immediately after placement or the "LEMENTATION dike will become a sediment source CONSIDERATIONS • Can be a hindrance to construction equipment moving p Capital Costs on the site G Maintenance MAINTENANCE REQUIREMENTS: O Training • Inspect regularly • Remove silt o o Suitability for Slopes > 5 /o • Repair erosion on the face of the dike • Provide additional stabilization if erosion occurs Other Considerations: • None POLLUTANT REMOVAL • Sediment • Nutrients & Toxic Materials • Oil & Grease • Floatable Materials • Other Construction Wastes Diversion Dikes CC -21 Format Rev. 02/10 iSWMTm Technical Manual Construction Controls 2.2.1 Primary Use The primary use of diversion dikes is to prevent erosion by diverting runoff around steep slopes and disturbed areas. The diversion dike is normally used to intercept offsite flow upstream of the construction area and direct the flow around the disturbed soils. It can also be used downstream of the construction area to direct flow into a sediment control, such as a sediment basin or protected inlet. The diversion dike serves the same purpose as an interceptor swale and, based on the topography of the site, can be used in combination with an interceptor Swale. 2.2.2 Applications By intercepting runoff before it has the chance to cause erosion, diversion dikes are very effective in reducing erosion at a reasonable cost. They are applicable to a large variety of projects including site developments and linear projects, such as roadways and pipeline construction. Diversion dikes are normally used as upslope perimeter controls for construction sites with large amounts of offsite flow that needs to be re- directed around the construction site. They can also be used as a downslope perimeter control to direct runoff from the disturbed area to a sediment control. Used in combination with swales, the diversion dike can be quickly installed with a minimum of equipment and cost, using the swale excavation material to construct the dike. No sediment removal technique is required if the dike is properly stabilized and the runoff is intercepted prior to crossing disturbed areas. Significant savings in sediment controls can be realized by using diversion dikes to direct sheet flow from disturbed areas to a central sediment control, such as a sediment basin or other sediment trap, instead of installing a series of high- maintenance linear controls. Dikes can also be used to direct runoff from disturbed areas to a filtration device, passive treatment system, or active treatment system when these are necessary to attain required levels of sediment removal. 2.2.3 Design Criteria • The maximum contributing drainage area should be 5 acres or less depending on site conditions. • Maximum depth of flow at the dike shall be 1 foot based on a 2 -year return period design storm peak flow. • Side slopes of the diversion dike shall be 3:1 or flatter. • Side slopes of the diversion dike may be 2:1 for dike installations to be used less than 3 months, if the dike is within an area protected by perimeter controls. • Minimum width at the top of the dike shall be 2 feet. • Minimum embankment height shall be 18 inches as measured from the toe of slope on the upgrade side of the berm. • For grades less than 2 percent and velocities less than 6 feet per second, the minimum required channel stabilization shall be grass, erosion control blankets, or anchored mulch. For grades in excess of 2 percent or velocities exceeding 6 feet per second, stabilization is required in the form of turf reinforcement mats (or riprap with appropriate size, gradation, and thickness depending on flow conditions). Velocities greater than 8 feet per second will require approval by the local municipality and is discouraged. • Refer to the Vegetation Fact Sheet in the iSWM Technical Manual for design criteria and guidance on establishing vegetation in the swale. • The dikes shall remain in place until all disturbed areas, which are protected by the dike, are permanently stabilized unless other controls are put into place to protect the disturbed area. • The flow line at the dike shall have a positive grade to drain to a controlled outlet. Diversion Dikes CC -22 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls • Diverted runoff from a disturbed or exposed upland area shall be conveyed to a sediment - trapping device. • The soil for the dike shall be placed in lifts of 8 inches or less and be compacted to 95 percent standard proctor density using ASTM D698 Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort. • Soil used in construction of the dike can be onsite material. It should be free of rocks larger than three inches in diameter and should be clay, silty clay or sandy clay with a plasticity index greater than 25. If only low PI material is available, it will be necessary to armor the slopes with stone or geotextile to prevent erosion of the dike. • An interceptor swale may be installed on the upslope side of the diversion dike. Refer to the Interceptor Swale Fact Sheet in the ISWM Technical Manual for swale design criteria. 2.2.4 Design Guidance and Specifications Specifications for construction of this item may be found in the Standard Specifications for Public Works Construction — North Central Texas Council of Governments, Section 201.7 Diversion Dike. 2.2.5 Inspection and Maintenance Requirements Dikes should be inspected regularly (at least as often as required by the TPDES Construction General Permit) to determine if silt is building up behind the dike or if erosion is occurring on the face of the dike. Silt shall be removed in a timely manner. If erosion is occurring on the face of the dike, the face of the slopes shall either be stabilized with mulch or seeding or the slopes shall be flattened. Diversion Dikes CC -23 Format Rev. 02/10 iSwM TM Technical Manual Construction Controls 2.2.6 Example Schematics Diversion Dikes CC-24 Format Rev. 02/10 RUNOFF FLOW POSITIVE DRAINAGE CROSS-SECTION DIVERSION DIKE PLAN VIEW N.T.S. — DIKE TO BE PLACED Z MIN. IN 8' LIFTS, COMPACTED 3-1 SLOPE TO 95% STD. PROCTOR OR FLATTER DENSITY FLOW 1S' MIN. 8' MIN 17 =d r MIN. i P EXISTING G GROUND SURFACE SHALL BE STABILIZED USING DESIGN CRITERIA BASM ON FLOW VELOCITY DWERSION DIKE CROSS SECTION N.T.S. Diversion Dikes CC-24 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls Diversion Dikes CC -25 Format Rev. 02/10 1 RUNOFF FLOW 1111( POSITNE DRAINAGE SWALE DIKE I CROSS-SECTION DIVERSION DIKE WITH SWALE PLAN VIEW N.T.B. DIKE TO BE PLACED 2° MIN. IN 8" UFTS, COMPACTED 3:1 SLOPE TO 95 STD. PROCTOR OR R DENSITY FLOW 1.5' MIN. { '777777 i ( 1,5 MAX 1 EXISTING GROUND REFER TOINTERCEPTOR SWALE FACT SHEET FOR DIMENSIONS AND NOTES DIVERSION DIKE WITH SALE CROSS SECTION N.T.S. Diversion Dikes CC -25 Format Rev. 02/10 r iSWMTM Technical Manual 2.3 Erosion Control Blankets Curb Street Erosion Control Blankets KEY CONSIDERATIONS DESIGN CRITERIA: • ECB selected based on slope, flow rate and length of service • Specify preparation of soil surface to ensure uniform contact with blanket • Installation and anchoring according to manufacturer's recommendations ADVANTAGES / BENEFITS: • Holds seed and soil in place until vegetation is established • Effective for slopes and embankments and small channels DISADVANTAGES / LIMITATIONS: • Not for use on slopes greater than 2:1 or in channels with shear stresses greater than 2.0 pounds per square foot MAINTENANCE REQUIREMENTS: • Replace or re- anchor loosened blankets • Remove sediment deposited on blankets POLLUTANT REMOVAL c Sediment O Nutrients & Toxic Materials O Oil & Grease O Floatable Materials O Other Construction Waste Erosion Control Blankets Format Rev. 02/10 Construction Controls Erosion Control Description: An erosion control blanket (ECB) is a temporary, degradable, rolled erosion control product that reduces soil erosion and assists in the establishment and growth of vegetation. ECBs, also known as soil retention blankets, are manufactured by many companies and are composed primarily of processed, natural, organic materials that are woven, glued, or structurally bound together with natural fiber netting or mesh on one or both sides. APPUCATIONS Perimeter Control Slope Protection Sediment Barrier Channel Protection Temporary Stabilization Final Stabilization Waste Management Housekeeping Practices Fe =0.90 (for area covered) Fe =0.65 (as perimeter control) lul' yu P►1 1 • • Capital Costs c Maintenance c Training • Suitability for Slopes > 5% Other Considerations: • Life expectancy, partial degradation, and mowing/ maintenance issues for ECBs left in place as part of final stabilization CC -26 iSWMTm Technical Manual Construction Controls 2.3.1 Primary Use Erosion control blankets (ECBs) are used to hold seed and soil in place until vegetation is established on 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. ECBs seeded for vegetation may be used as a perimeter control. When used in combination with other sediment barriers, such as silt fence or organic filter tubes blankets may be used as a perimeter control with or without vegetation. 2.3.2 Applications ECBs may be used on many types of disturbed areas but are most applicable on gradual to steep (2:1) cut/fill slopes and in swales and channels with low to moderate flow velocities. In these applications they may provide temporary stabilization by themselves or may be used with seeding to provide final stabilization. ECBs are also used to establish vegetation in channels where velocities are less than 6.0 feet per second. 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 controls for new development, particularly at the front on residential lots in new subdivisions. ECBs are an effective aid in establishing vegetated filter strips. 2.3.3 Design Criteria • Specific design information is required for the use of this control. The designer shall specify the manufacturer, type of erosion control blanket to be used, and dimensioned limits of installation based on the site topography and drainage. • 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 flowrate (sheet flow on cut/fill slopes) or velocity (concentrated flow in swales) of stormwater runoff in contact in with the ECB, and the anticipated length of service. • ECBs should meet the applicable "Minimum Performance Standards for TxDOT" as published by TxDOT in its "Erosion Control Report" and /or be listed on the most current annual "Approved Products List for TxDOT" applicable to TxDOT Item 169 Soil Retention Blanket and its Special Provisions. • ECBs shall be installed vertically down slope (across contours) on cut/fill slopes and embankments and along the contours (parallel to flow) in swales and drainage ditches. • ECBs designed to remain onsite as part of final stabilization shall have netting or mesh only on one side (the exposed side) of the ECB. The ECB shall be installed with the side that does not have netting or mesh in contact with the soil surface. All materials in the ECB, including anchors, should be 100 percent biodegradable within three years. • On cut/fill slopes and drainage ditches or swales designed to receive erosion control blankets for temporary or final stabilization, the ECBs shall be installed within 14 days of completing the grading of the structures. Do not delay installation of ECBs on these highly - erodible areas until completion of construction activities and stabilization of the remainder of the site. • Unless the ECB is seeded to establish vegetation, perimeter control applications shall be limited to thirty foot wide drainage areas (i.e. linear construction projects) for an 8 foot width of ECB. When seeded for vegetation, use of ECBs for perimeter control shall follow the criteria in the Vegetated Filter Strips and Buffers Fact Sheet of the iSWM Technical Manual. Erosion Control Blankets CC -27 Format Rev. 02/10 iSWMW Technical Manual Construction Controls • Prior to the installation of the ECB, all rocks, dirt clods, stumps, roots, trash and any other obstructions that would prevent the ECB from lying in direct contact with the soil shall be removed. 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. • Particular attention must be paid to joints and overlapping material. Overlap along the sides and at 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 and the sides of rolls shall overlap 4 inches. • 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 installation of the ECB. Criteria for seeding are in the Vegetation Fact Sheet of the iSWM Technical Manual. • Turf Reinforcement Mats should be used instead of ECBs for permanent erosion control and for stabilizing slopes greater than 2:1. • 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. 2.3.4 Design Guidance and Specifications Specifications for construction of this item may be found in the Standard Specifications for Public Works Construction — North Central Texas Council of Governments, Section 201.15 Erosion Control Blankets and in Item 169 of the Standard Specifications for Construction and Maintenance of Highways, Streets, and Bridges (TxDOT, 2004). 2.3.5 Inspection and Maintenance Requirements Erosion control blankets should be inspected regularly (at least as often as required by the TPDES Construction General Permit) for bare spots caused by weather or other events. Missing or loosened blankets must be replaced or re- anchored. 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. 2.3.6 Example Schematics The schematics are strictly examples of ECB installation techniques. The designer is responsible for working with manufactures to ensure the proper ECB use 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 being 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. Erosion Control Blankets CC -28 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls REFER TO TOP OF SLOPE ANCHORING EXAMPLES 3' MIN 4 INCH MINIMUM SIDE OVERLAP EROSION CONTROL BLANKET 3' MIN SHEET FLOW F �� ` STAPLES (TYP.) 12 INCH ON CENTER AT END OF ECB AND THROUGHOUT ECB AT 3' MINIMUM OVERLAP AT E SPACING RECOMMENDED BY OF BLANKETS. ECB AT HIGHER '' MANUFACTURER ELEVATION SHALL OVERLAP ON TOP OF LOWER ECB. ECB ISOMETRIC PLAN VIEW N.T.S. S1h1Ee. F 3' .„ t � rb y k y ro STAPLE SPACING AS RECOMMENDED BY „ MANUFACTURER ECB OVERLAP EXAMPLE Samoa: Westam Excelsior Corporation N.T.S. Erosion Control Blankets CC -29 Format Rev. 02/10 iSwMTm Technical Manual Construction Controls T MIN I ROW OF STAPLES, 12"C .. ..... . . . ... ... . . . . . . . ..... TOP OF SLOPE ANCHOR EXAMPLE 1 Uaww: Amencon EnceNeWlar pany N.T,3. YMIN STAPLE SPACING AS RECOMMENDED BY MANUFACTURER TOP OF SLOPE ANCHOR EXWPLE 2 Sau=: WoMem ExcaWw CarpwWdan N.T.S. Erosion Control Blankets CC-30 Format Rev. 02110 iSWMTM Technical Manual 2.4 Interceptor Swale Construction Controls Erosion Control Interceptor Swale CC -31 Format Rev. 02/10 Description: An interceptor swale is a Undisturbed Slope Design Water Surface small v- shaped, trapezoidal, or 15 max Depth F� parabolic channel that collects runoff DisprrbedArea and directs it to a desired location. It can either have a natural grass lining or, depending on slope and design "� Stabil[zation (torh;gh velocities) velocity, a protective lining of erosion control blankets, turf reinforcement 3.1 Ajax Slope Cross Section mats, rock riprap, or concrete. KEY CONSIDERATIONS APPLICATIONS DESIGN CRITERIA: Perimeter Control • Maximum flow depth of 1.5 feet for a 2 -year, 24 -hour Slope Protection design storm • Side slopes 3:1 or flatter Sediment Barrier • Minimum freeboard of 6 inches Channel Protection • Maximum contributing drainage area of 5 acres or less Temporary Stabilization ADVANTAGES / BENEFITS: Final Stabilization • Prevents erosion by and reduces cost of sediment Waste Management controls by directing "clean" runoff around disturbed areas Housekeeping Practices • Easy to install during early grading operations Fe =0.50 DISADVANTAGES I LIMITATIONS: (If vegetated with low velocities) • Must be stabilized immediately after excavation or the Swale will become a sediment source • May be unsuitable to the site conditions (too flat or IMPLEMENTATION steep) CONSIDERATIONS MAINTENANCE REQUIREMENTS: • Capital Costs • Inspect regularly G Maintenance • Remove debris or other obstructions so as not to p Training diminish flow capacity • Repair damage from storms or normal construction • Suitability for Slopes > 5% activities such as tire ruts Other Considerations: POLLUTANT REMOVAL None • Sediment • Nutrients & Toxic Materials • Oil & Grease • Floatable Materials • Other Construction Wastes Interceptor Swale CC -31 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls 2.4.1 Primary Use The primary use of interceptor swales is to prevent erosion by diverting runoff around disturbed areas and steep slopes. The interceptor swale can either be used to direct sediment -laden flow from disturbed areas into a sediment control or to direct 'clean' runoff from upslope areas around the disturbed areas. Since the swale is easy to install during early grading operations, it can serve as the first line of defense in reducing sediment by reducing runoff across disturbed areas. An interceptor swale reduces the requirements for structural measures to capture sediment from runoff, since the volume of runoff is reduced. By intercepting sediment laden flow downstream of the disturbed area, runoff can be directed into a sediment basin or other control for sedimentation as opposed to long runs of silt fence or other filtration method. Depending on site topography, swales can be effectively used in combination with diversion dikes. 2.4.2 Applications Common applications for interceptor swales include roadway projects, site development projects with substantial offsite flow onto the construction site, and sites with a large area(s) of disturbance. The swale can be used in conjunction with diversion dikes to intercept flows. Temporary swales can be used throughout the project to direct flows away from staging, storage, and fueling areas to minimize the potential for construction materials and wastes to come into contact with runoff. Runoff from disturbed areas that flows into a swale and flow within unstabilized (bare soil) swales must be routed into a sediment control such as a sediment basin. Dikes can also be used to direct runoff from disturbed areas to a filtration device, passive treatment system, or active treatment system when these are necessary to attain required levels of sediment removal. Vegetated swales are an effective final stabilization technique if used to permanently direct flows around steep, easily eroded, slopes. The vegetation in the swale also effectively filters both sediment and other t" pollutants while reducing erosion potential. 2.4.3 Design Criteria • Design calculations are required for the use of this control. The designer shall provide drainage computations, channel shape, channel dimensions, and channel slopes for each application. • The maximum contributing drainage area should be 5 acres or less depending on site conditions. • Maximum depth of flow in the swale shall be 1.5 feet based on a 2 -year, 24 -hour design storm. Positive overflow must be provided to accommodate larger storms. • For permanent swales, the 1.5 feet maximum depth can be increased as long as provisions for public safety are implemented. • The maximum contributing drainage area should be 5 acres or less depending on site conditions. • Channels may be trapezoidal, parabolic, or v- shaped; however v- shaped channels may be difficult to stabilize, so they are generally used only where the volume and rate of flow is low. • Side slopes of the swale shall be 3:1 or flatter. • Side slopes of the interceptor swale may be 2:1 for swales to be used less than 3 months if flows in the swale are directed to a sediment control. • Minimum design channel freeboard shall be 6 inches. • For grades less than 2 percent and velocities less than 6 feet per second, the minimum required channel stabilization shall be grass, erosion control blankets or anchored mulch. For grades in excess of 2 percent or velocities exceeding 6 feet per second, stabilization is required in the form of turf reinforcement mats (or riprap with appropriate size, gradation, and thickness depending on flow Interceptor Swale CC -32 Format Rev. 02/10 iSWMTm Technical Manual Construction Controls conditions). Velocities greater than 8 feet per second will require approval by the local municipality and is discouraged. • Refer to the Vegetation Fact Sheet in the iSWM Technical Manual for design criteria and guidance on establishing vegetation in the swale. • Check dams can be used to reduce velocities in steep swales. See the Check Dam Fact Sheet in the iSWM Technical Manual for design criteria. • Interceptor swales must be designed for flow capacity based on Manning's Equation to ensure a proper channel section. Alternate channel sections may be used when properly designed and accepted. • Consideration must be given to the possible impact that any swale may have on upstream or downstream conditions. • The outlet (discharge point) of the swale shall be designed to have non - erosive velocities or designed with velocity dissipation devices. • Diverted runoff from a disturbed area or other construction activity shall be conveyed to a sediment - trapping device. 2.4.4 Design Guidance and Specifications Specifications for construction of this item may be found in the Standard Specifications for Public Works Construction — North Central Texas Council of Governments, Section 201.6 Interceptor Swale. 2.4.5 Inspection and Maintenance Requirements Swales should be inspected regularly (at least as often as required by the TPDES Construction General Permit) to locate and repair any damage to the channel or to clear debris or other obstructions so as not to diminish flow capacity. Damage from storms or normal construction activities such as tire ruts or disturbance of swale stabilization shall be repaired as soon as practical. Accumulated sediment deposited from water in the swale should be removed regularly to maintain the hydraulic capacity of the swale. Interceptor Swale CC -33 Format Rev. 02/10 i iSWMTm Technical Manual Construction Controls 2.4.6 Example Schematics nonce_Qcr nu Interceptor Swale Format Rev. 02/10 CHANNEL WIDTH (PER DESIGN CALCULATIONS) FLATTER OR ......,, „„ CHANNEL SHALL BE STABILIZED USING DESIGN CRITERIA BASED ON FLOW VELOCITY Li WO � 01471 DESIGN WATER SURFACE ELEVATION CROSS SECTION N.T.S. NOTE: DIMENSIONS OF THE SWALE SHALL BE DESIGNED BASED ON FLOW CONDITIONS. PROVIDE CALCULATIONS THAT DOCUMENT THE FOLLOWING PARAMETERS USED TO DESIGN THE SWALE. • SIZE OF CONTRIBUTING DRAINAGE AREA • DESIGN STORM • SWALE CROSS SECTION DIMENSIONS AND SIDE SLOPES • GRADE OF FLOW LINE IN THE SWALE • DESIGN VELOCITY IN SWALE CC -34 iSWMTm Technical Manual 2.5 Mulching Construction Controls Erosion Control Mulching Format Rev. 02/10 CC -35 Description: Mulching is the application of ' a uniform layer of organic material over barren areas to reduce the effects of ' ' l Mu Chin erosion from rainfall. Types of mulch ' g include compost mixtures, straw, wood ' chips, bark, or other fibers. Commercialized surface treatments that combine straw or other mulch material with IstUr I organic or inorganic soil binding systems are also available and are particularly useful on steep slopes. KEY CONSIDERATIONS APPLICATIONS DESIGN CRITERIA: Perimeter Control • Specify even, uniform application F -Slope Protection • Minimum thickness of 2 inches Sediment Barrier • Application criteria specific to type of mulch • Anchor mulch on slopes of 3:1 to 1.5:1 Channel Protection • Do not use mulch on slopes steeper than 1.5:1 F7iempos Stabilization ADVANTAGES I BENEFITS: Final Stabilization Waste Management • Provides immediate stabilization of bare areas • Decreases soil moisture loss Housekeeping Practices • Decreases velocity of sheet flow • Reduces volume of sediment -laden flow Fe =0.90 DISADVANTAGES / LIMITATIONS: IMPLEKWATION • Subject to removal by wind or water CONSIDERATIONS • Results in lower soil temperature, which may yield longer seed germination periods C Capital Costs • Should not be applied within the ordinary high -water mark of natural surface waters or within the design flow depth of G Maintenance constructed ditches and channels O Training MAINTENANCE REQUIREMENTS: G Suitability for Slopes > 5% • Inspect regularly • Replace regularly in high traffic areas to maintain uniform Other Considerations: thickness • Availability of materials for mulch • Maintain a stockpile of excess mulch at the site to dress Application depends on slope, problem spots climate, and soil type POLLUTAM REMOVAL • Sediment O Nutrients & Toxic Materials O Oil & Grease O Floatable Materials o Other Construction Wastes Mulching Format Rev. 02/10 CC -35 iSWMTm Technical Manual Construction Controls 2.5.9 Primary Use Mulch may be used by itself to temporarily stabilize bare areas or with seed to establish final stabilization of bare areas. Mulch protects the soil from erosion and moisture loss by lessening the effects of wind, water, and sunlight. It also decreases the velocity of sheet flow, thereby reducing the volume of sediment -laden water flow leaving the mulched area. 2.5.2 Applications Mulch may be applied on most construction - related disturbed areas that require surface protection including: • Freshly seeded or planted areas; • Areas at risk due to the time period being unsuitable for growing vegetation; • Areas that are not conducive to seeding or planting; or • Steep slopes of 3:1 to 1.5:1, provided the mulch is anchored to the soil by use of soil stabilizers, netting, or crimping. Mulch is frequently applied with seeding for vegetation. In these cases, refer to the Vegetation Fact Sheet of the iSWM Technical Manual for related criteria that may affect mulching. Mulch may also be applied with commercially available polymers for soil surface treatment to bind the mulch with the soil. This method is particularly useful on steep slopes. Criteria is available in the Soil Surface Stabilization Fact Sheet of the iSWM Technical Manual. 2.5.3 Design Criteria • Specific design information is required for the use of this control. The designer shall specify the type of mulch to be used, the application rate and /or thickness, and the type of anchoring (if applicable) based on site conditions. • Mulch may be used by itself or in combination with netting or other anchors to promote soil stabilization. • Choice of mulch depends largely on slope, climate, and soil type in addition to availability of materials. • Mulch should be applied in an even and uniform manner where concentrated water flow is negligible. Do not apply mulch within the ordinary high -water mark of natural surface waters or within the design flow depth of constructed ditches and channels. • Straw mulch should be anchored by application of a fiber mulch binder, by the application of a synthetic liquid mulch binder, by using a tractor -drawn crimper to punch into the soil, or by placing netting above the mulch stapled to the ground. • Mulch hydraulically applied with soil stabilizers and binding agents is commercially available as a bonded fiber matrix (BFM), which may be particularly effective on slopes steeper than 2.5:1. • Mulch binders may be organic or inorganic polymers. Asphaltic emulsions and other petroleum- based tackifiers shall not be used. • Straw mulch shall be free of weed and grass seed. • Wood chips are suitable for areas that will not require mowing frequently and are heavy enough that they do not require anchoring. They do, however, deplete nitrogen from the soil, which is a necessary nutrient for all plants. To alleviate this condition, wood chips must be treated with 12 pounds of ammonium nitrate per ton of mulch used. Mulching CC -36 Format Rev. 02/10 iSWMTm Technical Manual Construction Controls • Bark chips are popular for ornamental applications, as they do not require anchoring, do not decompose very rapidly, and serve as an excellent insulation material. When using bark chips, it is not necessary to treat for nitrogen deficiency or to fertilize. • Compost and wood mulch mixtures should be a blend of 50 percent untreated wood mulch with 50 percent compost measured by volume. The mixture may be applied at different ratios than the 50 -50 mixture, if the basis for the mixture design is submitted to the reviewing municipality. • Wood mulch shall be less than or equal to 5 inches in length with 95 percent passing a 2 inch screen and less than 30 percent passing a 1 inch screen. • Compost for mulch shall meet the Physical Requirements specified in Table 1 of 2004 TxDOT Special Specification 1001, Compost. • Prior to the placement of mulch for final stabilization, the area to be protected must be graded in accordance with plans. • Fertilization and soil treatment for vegetation establishment should be done prior to placement of mulch, with the exceptions of when seed is to be applied by means of hydroseed or when seed is distributed following straw mulch spreading during winter months. • Organic mulches may be distributed by hand or my mechanical means, provided a uniform thickness as specified is achieved. • Mixing of mulch and compost material into the soil surface is allowed at the time final vegetation is established. Mulch should not contain chipped manufactured boards or chemically treated wood such as particleboard, railroad ties, or similar treated wood. • Hay should not be used as mulch. Refer to the table on the following page for additional guidance. Mulching CC -37 Format Rev. 02/10 iSWMTm Technical Manual Construction Controls Table 2.1 Mulch Standards and Guidelines Mulch Quality Application Remarks Material Standards Rates Air - dried, free from Cost - effective when applied with undesirable seed 2 to 3 inches adequate thickness. In windy areas Straw and from coarse thick; approx. 2 and on steep slopes, straw must be material. Straw tons per acre . held in place by crimping, using a soil fibers shall be 4 to stabilizer, or covering with netting. 8 inches in length. Cost - effective manner of disposing of Should include vegetative debris from site. Do not gradation from fine place in areas subject to flooding. to coarse to 2 inches minimum Decomposition of chipped vegetation Chipped Site promote thickness over competes with nutrients important to Vegetation interlocking area; approx. 10 subsequent grass establishment. properties. tons per acre. Maximum size 6 Mulch must be free of waste inches in length. materials such as plastic bag, metal debris, etc. Special caution is advised regarding Compost shall the source and composition of wood meet the Physical 2 inches minimum mulches. Determine whether the Wood Mulch and Requirements in thickness over preparation included weed /seed Compost Mixture Table 1 of TxDOT area; approx. 10 control. Wood mulches are an excellent soil amendment, ultimately Special Specification 1001. tons per acre. improving the organic content of the soil. Approx 25 -30 Ibs Apply with a hydromulcher. Fibers No growth inhibiting per 1000 feee or should be kept to less than % inch to Hydromulch factors. 1500 -2000 Ibs per prevent clogging equipment. Best used in conjunction with seed at time acre. of application. Follow the Bonded fiber matrix may be Hydraulically manufacturer's particularly effective on slopes Bonded Fiber applied mulch with recommendations. steeper than 2.5:1. Matrix tackifiers and (typically 3000 Ibs binding agents. per acre or greater). 2.5.4 Design Guidance and Specifications Specifications for construction of this item may be found in the Standard Specifications for Public Works Construction — North Central Texas Council of Governments, Section 201.16 Mulching. Specifications for compost may be found in Standard Specifications for Construction and Maintenance of Highways, Streets and Bridges (TxDOT 2004) Item 161. 2.5.5 Inspection and Maintenance Requirements Mulched areas should be inspected regularly (at least as often as required by the TPDES Construction General Permit) for thin or bare spots caused by natural decomposition or weather related events. Mulch in high traffic areas should be replaced on a regular basis to maintain uniform protection. Excess mulch Mulching Format Rev. 02/10 CC -38 iSWMTM Technical Manual Construction Controls should be brought to the site and stockpiled for use during the maintenance period to dress problem spots. 2.5.6 Example Schematics No schematics are associated with this construction control. Mulching CC -39 Format Rev. 02/10 iSWMTM Technical Manual 2.6 Pipe Slope Drain Construction Controls Erosion Control Pipe Slope Drain CC-40 Format Rev. 02/10 Description: A pipe slope drain is a p D Diversion Dike Flow Pipe Slope Drain temporary or permanent pipeline, typically utilizing flexible pipe, that conveys runoff down steep or D= Pipe Diameter unstabilized slopes without causing erosion. The drain is anchored on the Stabilized Outfall upstream end with some form of Unstabilized slope headwall to limit erosion and secure the pipe. KEY CONSIDERATIONS APPLICATIONS DESIGN CRITERIA: Perimeter Control • Maximum entrance grade of 3 percent Slope Protection • Anchor upstream end with a headwall or similar device • Secure pipe with hold down anchors spaced 10 feet on Sediment Barrier center Channel Protection • Stabilize outlet and provide velocity dissipation so that released flow has a velocity less than 3 feet per Temporary Stabilization second Final Stabilization ADVANTAGES / BENEFITS: Waste Management • Protects slopes from erosion caused by overland flow Housekeeping Practices • A series of pipes may be used to control drainage Fe= Varies areas greater than 5 acres in size DISADVANTAGES / LIMITATIONS: IMPLEMENTATION • Drain can easily be damaged by construction traffic CONSIDERATIONS • Additional cost to grade upstream of the pipe slope drain to direct flow into the pipe • Difficult to secure pipe to the slope • Capital Costs • Can become clogged during large rain events causing • Maintenance water to overflow and create a serious erosion o Training condition • Suitability for Slopes > 5% MAINTENANCE REQUIREMENTS: • Inspect regularly Other Considerations: • Repair damage to pipe joints • Unclog pipe Normally used in combination with interceptor swales or diversion dikes to POLLUTANT REMOVAL direct flow • Additional measures o Sediment needed to remove sediment o Nutrients & Toxic Materials from runoff o Oil & Grease c Floatable Materials O Other Construction Wastes Pipe Slope Drain CC-40 Format Rev. 02/10 iSWMTm Technical Manual Construction Controls 2.6.1 Primary Use Pipe slope drains are used to protect graded slopes during establishment of temporary and final vegetation. They are used on sites with a long, unstabilized, steep slope area that is subject to erosion from overland flow. Drains are normally used in combination with interceptor swales or diversion dikes to direct the flow into the pipe. The pipe slope drain can provide service for a relatively large area. It does not treat the runoff; therefore if the runoff contains sediment from a disturbed area, treatment through a sediment control is required before the flow is released offsite. 2.6.2 Applications Sites with large berms or grade changes, such as roadway embankments, are candidates for a pipe slope drain. Since provisions must be made to direct the flow into the pipe drain, some grading is normally required upstream of the pipe slope drain. Installed properly, slope erosion can be greatly reduced (but not entirely eliminated) through the use of the drain. Pipe slope drains also require a stabilized outlet. This is critical since the velocities at the outfall are normally high. Velocity dissipators such as stone or concrete riprap are typically required to reduce the velocity and spread the flow, reducing erosion. Flow from a pipe slope drain should be routed to a sediment control measure through interceptor swales, diversion dikes or other suitable methods. 2.6.3 Design Criteria • Design calculations and information are required for the use of this control. The designer shall provide drainage computations, pipe material, pipe size, and stone apron size for each application. • The entrance to the pipe slope drain may be a standard corrugated metal pre- fabricated flared end section with an integral toe plate extending a minimum of 6 inches from the bottom of the end section. • The grade of the entrance shall be 3 percent maximum. • The berm at the entrance shall have a minimum height of the pipe diameter plus 12 inches and a minimum width of 3 times the pipe diameter. • The drain pipe shall be made of any material, rigid or flexible, capable of conveying runoff. Regardless of material, the drain pipe shall be completely water -tight so that no water leaks onto the slope being protected. • All sections of the pipe slope drain shall be connected using watertight collars or gasketed watertight fittings. • All sediment -laden runoff conveyed by the pipe slope drain shall be directed to a sediment trapping facility. • The pipe shall be secured with hold down anchors spaced 10 feet on center. • Temporary pipe slope drains are to be sized to accommodate runoff flows equivalent to a 10 -year storm as calculated using the Rational Method and Manning's equation, but in no case shall pipes be sized smaller than shown on the following table: Table 2.1 Pipe Slope Drain Minimum Diameters Minimum Pipe Size Maximum Contributing Drainage Area 12 inches 0.5 Acres 18 inches 1.5 Acres 21 inches 2.5 Acres 24 inches 3.5 Acres Winches 5.0 Acres Pipe Slope Drain CC-41 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls • Maximum drainage areas for individual pipe slope drains shall be 5 acres. For areas larger than 5 acres, additional drains shall be added. • Both the entrance and outfall of the pipe slope drain should be properly stabilized. Grass can normally be used at the entrance, but armor type stabilization such as stone or concrete riprap is normally required to address the high velocities of the outfall. • A riprap lined apron shall be excavated to accept the discharge from the pipe and dissipate the energy of the flow. The width of the bottom of the apron shall be 3 times the pipe diameter, and the length shall be a minimum of 6 times the pipe diameter of the drain pipe. The apron shall be a minimum of 12 inches in depth and shall be lined with riprap weighing between 50 and 150 pounds per stone at a thickness of 12 inches minimum. The apron shall be designed so that the released flow has a velocity less than 3 feet per second. • The riprap apron at the outlet of the pipe slope drain shall use well graded stone riprap varying in diameter from 2 inches through 8 inches and shall be installed flat with no slope and flush with the surrounding ground. 2.6.4 Design Guidance and Specifications Specifications for construction of this item may be found in the Standard Specifications for Public Works Construction — North Central Texas Council of Governments, Section 201.14 Pipe Slope Drain and in the Standard Specifications for Construction and Maintenance of Highways, Streets and Bridges (TxDOT 2004) Item 506.2.6 and 506.4.C.2. 2.6.5 Inspection and Maintenance Requirements Pipe slope drains should be inspected regularly (at least as often as required by the TPDES Construction General Permit) to locate and repair any damage to joints or clogging of the pipe. In cases where the diversion dike has deteriorated around the entrance of the pipe, it may be necessary to reinforce the dike with sandbags or to install a concrete collar to prevent failure. Signs of erosion around the pipe drain should be addressed in a timely manner by stabilizing the area with erosion control blanket, turf reinforcement mats, riprap, concrete, or other acceptable methods. Pipe Slope Drain CC-42 Format Rev. 02110 iSwM TM Technical Manual Construction Controls Example Schematics Pipe Slope Drain CC-43 Format Rev, 02/10 iSWMTm Technical Manual 2.7 Soil Surface Treatments Construction Controls Erminn Cnntrni Bare Soil Description: Soil surface treatments are measures applied to a bare soil surface to temporarily decrease the amount of soil lost to wind and water erosion. Substances typically applied �7�r- 7- to the soil surface are water and organic and inorganic palliatives. Soil Treated Surface ",° surface treatments are also effective for the surfaces of temporary berms and stockpiles. KEY CONSIDERATIONS APPLICATIONS DESIGN CRITERIA: Perimeter Control • Maintain the original ground cover in areas as long as Slope Protection practical • Select treatment method based on soil type, site Sediment Barrier conditions, and required duration of effectiveness Channel Protection • Control traffic on areas being treated • Apply water before start of work and repeat throughout Temporary Stabilization the day Final Stabilization • Select, dilute and apply palliatives according to manufacturers recommendations Waste Management Housekeeping Practices ADVANTAGES / BENEFITS: • Prevents onsite and off -site impacts of dust deposition on roadways, drainage ways, or surface waters Fe= Varies IMPLEMENTATION DISADVANTAGES / LIMITATIONS: • Control methods often require repeated applications CONSIDERATIONS • Water has limited effectiveness on soils in wind erodibility groups 1 - 4 G Capital Costs MAINTENANCE REQUIREMENTS: C Maintenance • Inspect regularly o Training • Reapply water and palliatives as needed c Suitability for Slopes > 5% POLLUTANT REMOVAL Other Considerations: G Sediment • Worker protection for mixing, dilution, and application of o Nutrients &Toxic Materials some palliatives o Oil & Grease o Floatable Materials o Other Construction Wastes Soil Surface Treatments Format Rev. 02/10 CC-44 iSWMTm Technical Manual Construction Controls 2.7.1 Primary Use Surface treatments are used to reduce wind and water erosion by providing temporary stabilization of bare soil. They are primarily used where stabilization is needed for less than 18 months. 2.7.2 Applications Soil surface treatments are applicable to any construction site where dust is created and there is the potential for air and water pollution from dust being blown off the site. The treatments are applicable to bare areas of soil, temporary soil berms, stockpiles, earth - moving activities, and demolition activities, all of which can be sources of dust. The National Resources Conservation Service (NRCS) assigns a wind erodibility group to soils. Soil surface treatments for dust control will be most applicable to soils in groups 1 through 4. These soils typically do not retain moisture well. They are poor candidates for water treatments and may require palliatives to adequately control dust. 2.7.3 Design Criteria General • The first, and possibly the most important, design criteria for soil surface treatments is to minimize the area of disturbed soil that requires treatment. • Limit clearing and grading to the areas of the site required for the immediate phase of construction. For larger sites, plan the work to be phased such that the total disturbed area is less than 10 acres at all times. If possible, design the site layout and grading to allow for street and utility construction without having to grade the entire site to balance cut and fill. • Selection of the surface treatment should consider the length of time for which stabilization is needed. • Natural (e.g. trees) windbreaks or artificial wind screens can be designed into the site to decrease wind erosion potential. Wind screens should be 3 to 5 feet in height. Porosity of the wind screens should be 50 percent or less, but not impermeable. The purpose of the screen is to disrupt the wind, not block it. • Wind screens placed around stockpiles shall enclose three sides of the stockpile. Water Treatments • Water treatment is appropriate for areas that are worked daily or at least as frequently as every week or two. Areas where construction activities will not occur for more than 14 days should receive another type of surface treatment. • Water shall be applied 15 to 20 minutes before start of work and re- applied throughout the day as necessary to prevent visible emissions. • At a minimum, sprinkle bare areas with an amount of water and at a rate that will moisten the top two inches of soil without creating runoff. • When grading activities are occurring during prolonged dry and windy periods, sufficient water should be applied to moisten soil to the depth of cut or equipment penetration. This may require installing portable piping and sprinklers that can run overnight before a day of grading. • If construction activities include installing an irrigation system, install it in early phases of construction, where feasible, to use for dust control. • Water treatments provide limited stabilization against wind erosion and no stabilization against water erosion. Sediment controls are required with water treatments. Soil Surface Treatments CC-45 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls Palliative Treatments • Palliatives consist of liquids that react with soil particles and bonds them into a cohesive crust that provides temporary resistance to wind and water erosion. Palliative treatments are also called soil binders. • The major groups of palliatives used for erosion control are polyacrylamide (PAM), guar -based (organic) compounds, and polyvinyl acetates (inorganic polymers). Numerous variations and mixes of these palliatives are available, each with its unique properties. • Palliative treatments are appropriate for areas that require temporary stabilization for 3 to 18 months. Palliative treatments are highly effective in controlling wind erosion and moderately effective in controlling water erosion. Perimeter controls for sediment should remain in place until final stabilization. • Selection of the palliative mix, dilution rate, and application rate should be based on the soil type, site conditions, climate, anticipated traffic on the treated area, and required duration of the stabilization. • The designer should work with the supplier to develop a mix specific for the soil, climate, and site conditions. A successful application is highly dependent on the right proportions in the mix. An "off the shelf" mix should not be used. • Palliatives are dependent on soil penetration to be effective. Compaction of soil prior to stabilization should be minimized. If compaction has occurred or the soil has high clay content, loosening of the surface may be necessary before applying the palliative. • Do not apply palliatives in rainy conditions or when the soil has high moisture content. Verify that there is not rain in the forecast for the length of time recommended by the manufacturer to cure the palliative. Typically, a minimum of 24 hours is required. • If the soil is excessively dry, pre- wetting may be necessary to ensure the palliatives do not cure too quickly. • Palliative mixes may be supplied as a powder or a concentrated liquid. The designer should work with the supplier to establish exact dilution and application rates for the site. An application without enough water for the site and climate conditions will dry too quickly, and the soil particles will not bond properly. A too wet mix will result in a weaker bond that may not be sustained for the required duration of the stabilization. • Palliatives should not be diluted until it is time for the palliative to be applied. • Palliative treatments that can withstand traffic (pedestrian or vehicle) are available; however, they are more expensive. The designer shall determine whether the site can be controlled to prevent traffic on the stabilized areas. This analysis should consider non - construction related traffic. Often, the public driving ATV's and bicycles on the site when construction is not active is the cause of stabilization failure. In many cases, temporary chain -link fencing is less expensive than a palliative mix that can withstand traffic or re- applying a mix to areas that have been disturbed. • Palliatives may be applied with mulch to stabilize slopes of 3:1 to 1.5:1. Additional criteria are in the Mulching Fact Sheet of the iSWM Technical Manual. • Palliatives may be mixed and applied with seed to establish vegetation. The palliative mix used for this application must be specified as one that is air and water permeable. The palliative will provide temporary stabilization until vegetation is established for final stabilization. Vegetated Treatments • If an area will not be disturbed by construction activities for a year or longer, vegetation is frequently the most cost - effective treatment. • The Vegetation Fact Sheet of the iSWM Technical Manual contains criteria for temporary stabilization with vegetation. Soil Surface Treatments CC-46 Format Rev. 02/10 iSWMTA° Technical Manual Construction Controls Other Treatments • Gravel, recycled concrete or asphalt, or similar rock should be applied to temporary roads, contractor staging areas, employee parking lots and other portions of the site that receive daily traffic. The treatment will prevent dust and decrease the need for sediment controls on these areas during the duration of the construction project. • Soil roughening, by driving tracked vehicles up and down slopes and across bare areas in irregular patterns, can be used to disrupt wind and water flow across the soil surface and decrease erosion for short periods of time. The track marks should be perpendicular to the predominate direction of water flow or wind. • Similar to soil roughening, deep tillage (6 to 12 inches) in large open areas can significantly disrupt wind and drainage patterns to reduce erosion. • Do not use "soil tackifiers" that are petroleum- based. 2.7.4 Design Guidance and Specifications No specification for soil surface treatments is currently available in the Standard Specifications for Public Works Construction — North Central Texas Council of Governments. 2.7.5 Inspection and Maintenance Requirements Soil surface treatments should be inspected regularly (at least as often as required by the TPDES Construction General Permit). Adequacy of watering for dust control should be visually monitored. If dust is observed, additional applications or different controls are needed. Areas that have received a palliative treatment should be checked for breaks or eroded spots in the surface crust. This spots and areas that have been driven on or otherwise disturbed should be re- treated. Palliative treatments are intended to control sheet erosion. If rill erosion is detected during inspections, additional controls are needed. 2.7.6 Example Schematics No schematics are associated with this construction control. Soil Surface Treatments CC -47 Format Rev. 02/10 iSWMTm Technical Manual 2.8 Turf Reinforcement Mats Construction Controls Erosion Control Turf Reinforcement Mats CC-48 Format Rev. 02/10 Description: A turf reinforcement mat (TRM) is a long -term, non- "' degradable, rolled erosion control product that reduces soil erosion and -y y+ assists in the establishment and growth of vegetation. TRMs, also r► +' s known as flexible channel liners, are * '� u ° 'm'" ` +►` *, manufactured by many companies UV and are composed primarily of oho?` +► stabilized, geosythetic or geocomposite materials, nettings r� and /or wire mesh, processed into a three dimensional reinforcement matrix. TRMs are designed to be permanent and for use in critical hydraulic conditions. KEY CONSIDERATIONS APPLICATIONS DESIGN CRITERIA: Perimeter Control • TRM selected based on flow velocities and shear Slope Protection stresses in the channel • Installation and anchoring according to manufacturer's Sediment Barrier _ recommendations Channel Protection Temporary Stabilization ADVANTAGES / BENEFITS: • Provides long -term stabilization of channels with high Final Stabilization velocities and shear stresses Waste Management • Retains soil in a 3- dimensional matrix that facilitates establishment of vegetation Housekeeping Practices Fe =O.9O DISADVANTAGES / LIMITATIONS: • Expensive • Effectiveness is highly dependent on proper installation IMPLEMENTATION CONSIDERATIONS MAINTENANCE REQUIREMENTS: • Inspect regularly • Capital Costs • Replace or re- anchor loosened mats G Maintenance o Training POLLUTANT REMOVAL • Suitability for Slopes > 5% • Sediment • Nutrients & Toxic Materials Other Considerations: • Oil & Grease • Long term maintenance • Floatable Materials • Other Construction Wastes Turf Reinforcement Mats CC-48 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls 2.8.1 Primary Use Turf reinforcement mats (TRMs) are primarily used to provide temporary and final stabilization of channels where design discharges exert velocities and shear stresses that exceed the limits of mature vegetation. They are also used to stabilize steep slopes where it's difficult to establish vegetation. 2.8.2 Applications TRMs provide long -term erosion protection in channels where flow conditions exceed the ability of vegetation alone to withstand erosive forces (grades in excess of 2 percent or velocities exceeding 6 feet per second). Turf reinforcement mats may provide channel protection for conditions of up to approximately 8 Ibs /ft2 sheer stress. TRMs are also applicable to short lengths of steep cut/fill slopes on which establishing vegetation is difficult. While providing erosion control, TRMs also contain void spaces that can retain soil that would erode without protection, and thus give vegetation a change to establish. 2.8.3 Design Criteria • Specific design information is required for the use of this control. The designer shall specify the manufacturer, type of TRM to be used, and dimensioned limits of installation based on the site topography and drainage. • The type and class of TRM must be specified in accordance with the manufacturer's guidance for the slope of the area to be protected, the flowrate (sheet flow on cut/fill slopes) or velocity (concentrated flow in swales) of stormwater runoff in contact in with the TRM, shear stress, and the design life (duration) of the TRM. • TRMs specified on projects should meet the applicable "Minimum Performance Standards for TxDOT" as published by TxDOT in its "Erosion Control Report." Alternatively, the TRM may be listed on the most current annual "Approved Products List for TxDOT" applicable to TxDOT Item 169 Soil Retention Mat and its Special Provisions. • TRMs shall meet the following criteria when applied on slopes of 0.5:1 or flatter. o Minimum thickness of 0.25 inches using ASTM D6525 Standard Test Method for Measuring Nominal Thickness of Permanent Rolled Erosion Control Products. • UV stability of 80 percent at 500 hours using ASTM D4355 Standard Test Method for Deterioration of Geotextiles by Exposure to Light, Moisture and Heat in a Xenon Arc Type Apparatus. • Minimum tensile strength of 175 Ibs /ft using ASTM D6818 Standard Test Method for Ultimate Tensile Properties of Turf Reinforcement Mats. • TRMs shall be installed vertically down slope (across contours) on steep cut/fill slopes and embankments. In channels, TRMs shall be installed along the contours (parallel to flow) below the water surface elevation of the "Flood Mitigation" storm event (100 -year, 24 -hour) and vertically across any steep slopes for high banks above the water surface elevation. • On cut/fill slopes and channels designed to receive turf reinforcement mats for temporary or final stabilization, the TRMs shall be installed within 14 days of completing the grading of the structures. Do not delay installation of TRMs on these highly - erodible areas until completion of construction activities and stabilization of the remainder of the site. • Prior to the installation of the TRM, all rocks, dirt clods, stumps, roots, trash and any other obstructions that would prevent the TRM from lying in direct contact with the soil shall be removed. • Installation and anchoring shall conform to the recommendations shown within the manufacturer's published literature for the turf reinforcement mat. Anchors (staples) shall be a minimum of 6 inches in length and 1 inch wide. They shall be made of 8 -gauge wire, or equivalent. Turf Reinforcement Mats CC49 Format Rev. 02/10 iSWMTM Technical Manual Construction Controls • The end of each TRM roll shall overlap the next end of the next roll by a minimum of 3 feet. Sides of rolls typically overlap a minimum of 4 inches. • The perimeter of the TRM installation shall be anchored into a trench that is a minimum of 6 inches deep. • The upstream end of TRMs used for channel protection shall be anchored a minimum of 12 inches, while the downstream end should be anchored 6 inches. • Trenches shall be excavated for anchoring, followed by placement and tamping of fill on top of the mat. 2.8.4 Design Guidance and Specifications Specifications for this item may be found in Item 169 of the Standard Specifications for Construction and Maintenance of Highways, Streets and Bridges (TXDOT 2004). 2.8.5 Inspection and Maintenance Requirements Turf reinforcement mats should be inspected regularly (at least as often as required by the TPDES Construction General Permit) for bare spots caused by weather or other events. The mats should be checked for uniform contact with the soil, security of the lap joints, and flushness of the staples with the ground. Missing or loosened mats must be replaced or re- anchored. 2.8.6 Example Schematics The schematics are strictly examples of TRM installation techniques. The designer is responsible for working with manufactures to ensure the proper TRM is specified based on the site topography and drainage. Installation measures should be dictated by the TRM manufacturer and are dependent on the type of TRM being 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. Turf Reinforcement Mats CC -50 Format Rev. 02/10 iSVVMTM Technical Manual Construction Controls REFER TO END OF TRM OVERLAP EXAMPLE REFER TO UPSTREAM END ANCHOR EXAMPLE REFER TO PERIMETER 4* MIN OVERLAP ANCHOR EXAMPLE O 3' MIN � � \ • '- \ `�N \ REFER TO DOWNSTREAM END ANCHOR EXAMPLE TRM ISOMETRIC PLAN VIEW Source: McdMed from American Excelsior Comparry N.T.S. FLOW V MIN UPSTREAM MAT 1 DOWNSTREAM MAT J A /V, od r �, 'f ✓ Q �' t' STAPLE SPACING AS fi RECOMMENDED BY MANUFACTURER - END OF TRM OVERLAP EXAMPLE Souma: MW&d from Team Dep Vwd of Tranapafetlon Sou Retenwn N.T.S. Blanket Product Installation Sheet for Flmdble Channel unera. Turf Reinforcement Mats CC -51 Format Rev. 02/10 iSVVMTm Technical Manual Construction Controls Vehicle and equipment management controls should be inspected regularly (at least as often as required by the TPDES Construction General Permit). Verify that washing, fueling, storage, and disposal procedures are being followed. Correct workers where needed. Fueling and maintenance fluid storage areas should be checked for signs of leakage or spills. If evidence is found, corrective actions should be implemented. Reinforce proper procedures through re- education of employees. Inspect areas where vehicles and equipment are parked for signs of leaks. Use drip pans where needed. 4.1 0.6 ti No schematics are associated with this construction control. Vehicle and Equipment Management CC -204 Format Rev. 02/10 Copy of Record Texas Commission on Environmental alit Construction Notice of Intent Site Information (Regulated Entity) What is the name of the site to be BMSC /Naterra Corporate HQ authorized? Does the site have a physical address? Yes Physical Address Number and Street 1250 South Freeport Parkway City Coppell State TX ZIP 75019 County DALLAS Latitude (N) (##. 32.93891 Longitude (W) (AW.# ) - 97.00713 Primary SIC Code 1541 Secondary SIC Code Primary NAICS Code 236220 Secondary NAICS Code Regulated Entity Site Information What is the Regulated Entity's Number (RN)? What is the name of the Regulated BMSC /Naterra Corporate HQ Entity (RE)? Does the RE site have a physical Yes address? Physical Address Number and Street 1250 South Freeport Parkway City Coppell State TX ZIP 75019 County DALLAS Latitude (N) (##.####) 32.93891 Longitude (W) (- ###.##;) - 97.00713 What is the primary business of this commercial construction of a warehouse/ entity? office DUKE CO- Customer (Applicant) Information How is this applicant associated with OPERATOR this site? https:// www90. tceq .texas.govJePermitsExtemalWEBI faces /uilreportslcopyOfRecordReport .xhtml ?submitld = 651563 (1 of 6)4/29/2013 12:42:52 PM Copy of Record What is the applicant's Customer Number (CN)? Type of Customer Full legal name of the applicant: Legal Name Texas SOS Filing Number Federal Tax ID State Franchise Tax ID DUNS Number Number of Employees Independently Owned and Operated? I certify that the full legal name of the entity applying for this permit has been provided and is legally authorized to do business in Texas. Responsible Authority Contact Organization Name Prefix First Middle Last Suffix Title Responsible Authority Mailing Address Enter new address or copy one from list: Address Type Mailing Address (include Suite or Bldg. here, if applicable) Routing (such as Mail Code, Dept., or Attn:) City State ZIP Phone (###- ###- ;##1#) Extension Alternate Phone ( ) Fax (###- #/## E -mail application Contact CN603216201 Partnership DUKE CONSTRUCTION LIMITED PARTNERSHIP 012135411 35189423 13518984235 501+ Yes Yes DUKE CONSTRUCTION LIMITED PARTNERSHIP Jeff Langston Project Manager Domestic 14241 DALLAS PKWY STE 1000 DALLAS TX 75254 9723616700 9723616800 Jeffrey. Langston@dukerealty.com https: / /www90. tceq .texas.gov /ePermitsExtemalWEB/ faces /uil reports /copyOfRecordReport.xhtml ?submitld - ~651563 (2 of 6)4/29/2013 12:42:52 PM Copy of Record Person TCEQ should contact for questions about this application: Same as another contact? Organization Name Prefix First Middle Last Suffix Title Enter new address or copy one from list: Mailing Address Address Type Mailing Address (include Suite or Bldg. here, if applicable) Routing (such as Mail Code, Dept., or Attn:) City State ZIP Phone Extension Alternate Phone Fax (###- ### -####) E -mail CNOI General Characteristics SWPPP INSPECTIONS INC Don Wims President Domestic PO BOX 496987 GARLAND TX 75049 9725305307 9725305309 dwims @swppp.com 1) Is the project located on Indian No Country Lands? 2) Is your construction activity No associated with a facility that, when completed, would be associated with the exploration, development, or production of oil or gas or geothermal resources? 3) What is the Primary Standard 1541 Industrial Classification (SIC) Code that best describes the construction activity being conducted at the site? 4) If applicable, what is the Secondary SIC Code(s)? 5) Is the project site part of a larger No common plan of development or sale? 6) What is the total number of acres 18 disturbed? https: / /www90 .tceq.texas.gov /ePermitsExtemal WEB /facesluil reports lcopyOfRecordReport.xhtml ?submitld= 651563 (3 of 6)4/29/2013 12:42:52 PM Copy of Record 7) What is the name of the first water Grapevine Creek body(s) to receive the stormwater runoff or potential runoff from the site? 8) What is the segment number(s) of the 0822 classified water body(s) that the discharge will eventually reach? 9) Is the discharge into an MS4? Yes 9.1. What is the name of the MS4 City of Coppell Operator? 10) Are any of the surface water bodies Yes receiving discharges from the construction site on the latest EPA - approved CWA 303(d) List of impaired waters? 10.1. What is the name(s) of the Grapevine Creek impaired water body(s) receiving the discharges from the contruction site? 11) Is the discharge or potential No discharge within the Recharge Zone, Contributing zone, or Contributing zone within the Transition zone of the Edwards Aquifer, as defined in 30 TAC Chapter 213? 12) 1 certify that a stormwater pollution Yes prevention plan has been developed, will be implemented prior to construction, and to the best of my knowledge and belief is compliant with any applicable local sediment and erosion control plans, as required in the general permit TXR150000. Note: For multiple operators who prepare a shared SWP3, the confirmation of an operator may be limited to its obligations under the SWP3 provided all obligations are confirmed by at least one operator. 13) 1 certify that I have obtained a copy Yes and understand the terms and conditions of the Construction General Permit (TXR150000). 14) 1 understand that a Notice of Yes Termination (NOT) must be submitted when this authorization is no longer needed. Certification certify that I am authorized under 30 Texas Administrative Code Subchapter 305.44 to sign this document and can provide documentation in proof of such authorization upon request. https: / /www90. tceq .texas.gov /ePermitsExtemalWEB/ faces /uil reports /copyOfRecordReport.xhtml ?submitld = -- 651563 (4 of 6)4/29/2013 12:42:52 PM Copy of Record 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. 1. I am Jeffrey A Langston, the owner of the STEERS account ER031327. 2. 1 have the authority to sign this data on behalf of the applicant named above. 3. 1 have personally examined the foregoing and am familiar with its content and the content of any attachments, and based upon my personal knowledge and /or inquiry of any individual responsible for information contained herein, that this information is true, accurate, and complete. 4. 1 further certify that I have not violated any term in my TCEQ STEERS participation agreement and that I have no reason to believe that the confidentiality or use of my password has been compromised at any time. 5. 1 understand that use of my password constitutes an electronic signature legally equivalent to my written signature. 6. 1 also understand that the attestations of fact contained herein pertain to the implementation, oversight and enforcement of a state and /or federal environmental program and must be true and complete to the best of my knowledge. 7. 1 am aware that criminal penalties may be imposed for statements or omissions that I know or have reason to believe are untrue or misleading. 8. 1 am knowingly and intentionally signing Construction Notice of Intent. 9. My signature indicates that I am in agreement with the information on this form, and authorize its submittal to the TCEQ. OPERATOR Signature: Jeffrey A Langston OPERATOR Account Number: ER031327 Signature IP Address: 207.250.178.132 Signature Date: 2013 -04 -29 Signature 433F67EOBCBF5D356DECF1A3B3F7147B1AOD621DF650786EEBOF972F85067829 Hash: Form 015FB127C68F94E57E831B7C20DD12C56EO82COF6715E6537A4D6296707DCD90 Hash Code at time of Signature: Fee Payment Transaction by: Paid by: Fee Amount: Paid Date: TransactionNoucher number: Submission The application fee payment transaction was made by ER021991 /Nathan E White The application fee was paid by DONALD WIMS $225.00 The application fee was paid on 2013- 04-29 The transaction number is 582EA000141172 and the voucher number is 177659 https: / /www9O.tceq. texas. gov /ePermitsExtemalWEB/ faces /uil reports /copyOfRecordReport.xhtml ?submitld= 651563 (5 of 6)4/29/2013 12:42:52 PM Copy of Record Reference Number: Submitted by: Submitted Timestamp: Submitted From: Confirmation Number: Steers Version: Additional Information The application reference number is 65837 The application was submitted by ER021991 /Nathan E White The application was submitted on 2013- 04-29 at 12:41:46 CDT The application was submitted from IP address 172.3.105.152 The confirmation number is 68576 The STEERS version is 5.88 Application Creator: This account was created by Nathan E White https: / /www9O.tceq. texas. gov /cPcrmitsExtemalWEB/ faceslui/ reports/ copyOfRccordReport .xhtml ?submitId= 651563 (6 of 6)4/29/2013 12:42:52 PM COOW•,p"� • i•1 W Q T r+ Rg w VET O a� Ch aqi q bA O O N u N 0A �a y 0 0 ai p W,eN� 00 ° °0 too w 10 o 0 z am V y= t"� 0 N a` N 3 r� be w S N a� +. q NO A�o o � .�N3 ao RA ai o 0 o. b y>+oa 1 �. . 1 � � o o� � O owed 0.5° �0 U O p�� 000 O ap� UD q O M q � q W� OA.a°�o a x a O 0 z 0 Aw Iz is+O• M A 06 A a� �a 0� o� W�oa 0 G O O'm UWU oho >% O q a�� M 0 0w� 0 M� Ate' p0 N b � 0 .d ,o° y O y c b0� O hod OS CaJ 'ti m 0 O a M N N A rr Notice of Termination (NOT) TCEQ Of Use Only Permit No..: : for Authorizations under RN: `/ 'TP ES General Permit TXR150000 CN: TCEQ _.. .... _. . . ...... Sign up now for on line NOT at h!!p://www.tceg.state.tx.us/permitting/steers/stegr&htmi Get your NOT Confirmation letter immediately after submitting the on line NOT form. What is the permit number to be terminated? Processing will be delayed without the permit number. TXR15 A. OPERATOR a licant ...... �„ _ .. „ „µw N issued to this enti ? CN 1. What is the CustomerNumberC ) ....._a. _......__...........__ ..._ .....� .... _ _ 2. What is the full Legal Name of the current permittee? This must be the current aermittee o the ermit to be terminated. . .,_ .. „_.An..n._.- .........--- 3. What is the applicant's mailing address as recontzed b the US Postal Service? Address: . _ � Suite No./Bldg. Code: m�..._._�. �.�. ,.,..__ Ct State: ZIP Code: �:....... .�.A,,,,,...,.�. m.....�. .......�_ ... -....e..n,,,,,..nM.n.... �, a __g_!, - - ---- -, ,,. CountrMailin Information (if outside USA). Country Code Postal Code 4. Phone No.: ❑ Extension ...... )._ .._ .._ __.. _.. .. ...... 5. I ax No . E -mail Address B. . REGULATED ENTITY (RE) INFORMATION ON PROJECT OR SITE _� . ... ......... ..........._ ._ ....._._. ....... ....._... ........ .. _ _,. ... _ _.._ _ . _m.. ...... _.._ .._...._ ...... 1. What is the TCEQ Issued RE Reference Number (RN)? RN .ddddddss �.... .� ................. m.,............- 2. Name of Project or Site as currently permitted): lexam�sle phase and name of subdivision or name ofrodect that's unique to the site Physical Address of Project or Site as currently permitted: (enter in spaces below) Street Number Street Name City ZIP Code _ County (Counties if >1): -4- no physical address (Street Number & Street Name), provide the written location access description to the site: C. REASON FOR TERMINATION Ch ck the r eason for - t-e e rmin ation-:-- m—_ � — - . �._. �.� . � . .. ..... ❑ Final stabilization has been achieved on all portions of the site that are the responsibility of the Operator and all silt fences and other temporary erosion controls have either been removed, or scheduled for removal as defined in the SWP3. ❑ Another permitted Operator has assumed control over all areas of the site that have not been finally stabilized, and temporary erosion controls that have been defined in the SWP3 have been transferred to the new Operator. ❑ The activity is now authorized under an alternate TPDES permit. ❑ The actiyi y never bean at this site that is re dated under the eneral�etmit. D. CERTIFICATION __.._._._ _. hm_ ........................ .._.. ... _. _... Typed or printed name Title certify under penalty of law that this document and all attachments were prepared corder 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. I further certify that I am authorized under 30 Texas Administrative Code §305.44 to sign and submit this document, and can provide documentation in proof of such authorization upon request. gnature: Date:- (Use blue ink) ..._ TCEQ -20023 (02/06/2007) Page 1 MEMO= i son low" Now J� LARGE CONSTRUCTION SITE NOTICE FOR THE Texas Commission on Environmental Quality (TCEQ) Stormwater Program TPDES GENERAL PERMIT T 1 0'O "PRIMARY OPERA R" N IICE LARGE CONSTRUCTION SITE NOTICE FOR THE Texas Commission on Environmental Quality (TCEQ) Stormwater Program TPDES GENERAL PERMIT TXR150000 "SECONDARY OPERATOR " NOTICE This notice applies to secondary operators of construction sites operating under Part II.E.3. of the TPDES General Permit Number TXR150000 for discharges of stormwater runoff from construction sites equal to or greater than five acres, including the larger common plan of development. The information on this notice is required in Part III.D.2. of the general permit. 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 Site - Specific TPDES Authorization Number: TXR15WS23 Operator Name: SFPLP Holdings Management LLC Contact Name and Phone Number: SWPPP INSPECTIONS INC Don Wims 9.530.5307 Project Description: Physical address or description of the BMSC /Naterra Corporate HQ site's location, and estimated start date and projected end Dallas Mapsco 11 M date, or date that disturbed soils will be stabilized. Coppell, TX 75019 est. start: 05/o6/2013 est. end: 02/2014 Locationo Stormwater Pollution Prevention Plan (SWP3): on site For Large Construction Activities Authorized Under Part II.E.3. (Obtaining Authorization to Discharge) the following certification must be completed: I Jin K. Song (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.3. 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 ]mowing violations. I--\_ , I-, — j Signature and Title M t?< ate 2© Date Notice JG,oved MS4 operator notified per Part AF.3. Nate White From: Nate White [nwhite @swppp.com] Sent: Friday, May 03, 2013 8:57 AM To: 'kgriffin @ci.coppell.tx.us' Cc: Don Wims (dwims @swppp.com) Subject: NOI and CSN for BMSC /Naterra Corporate HQ Attachments: BMSC Naterra Corporate HQ Owner CSN.PDF; BMSC - Naterra Corporate HQ NOI.PDF; BMSC - Naterra Corporate HQ Permit.pdf Ken, Attached is the Notice of Intent (NOI) {and permit} for BMSC /Naterra Corporate HQ; and the Construction Site Notice (CSN) for BMSC /Naterra Corporate HQ. Please let me know if we need to get this to someone else. Please verify you received this email. Thanks, Nathan White SWPPP INSPECTIONS, INC. 214.843.5802 mobile 972.530.5307 office 972.530.5309 fax OPERATOR CERTIFICATION Each operator must be identified and must sign the following certification statement that they understand and will comply with the terms of the SWPPP. Name of Operator: DUKE CONSTRUCTION LIMITED PARTNERSHIP Address: 14241 N. Dallas Pkwy Suite 1000 Dallas, TX 75254 Telephone Number. 972.361.6700 Type of construction service provided: General Contractor Certification Statement: "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 upon my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." This certification is signed in reference to the SWPPP associated with BMSGNaterra Corporate HQ in Coppell, TX. Name- ]efirey Langstoq m._......µ,.,......... Signature: Title: ...........w..,.., Project Manager ............a.. �._ Date: "' / OPERATOR CERTIFICATION Each operator must be identified and must sign the following certification statement that they understand and will comply with the terms of the SWPPP. Name of Operator: SFPLP Holdings Management LLC Address: 1200 Lakeside Parkway Flower Mound, Texas 75028 Telephone Number: 972.241.9665 Type of construction service provided: Owner Certification Statement: "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 upon my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." This certification is signed in reference to the SWPPP associated with BMSC/Naterra Corporate HQ in Coppell, TX. ]Name: tin K. Song Title: IV14 If Signature: ,� Date: , 2, l� SUBCONTRACTOR CERTIFICATION Each subcontractor engaged in activities that disturb surface soils should sign the following certification statement that they understand and will comply with the terms of the SWPPP. Name of Contractor or Subcontractor: Address: Telephone Number: Type of construction service provided: Certification Statement: "I certify under penalty of law that I understand the terms and conditions of the Texas Pollutant Discharge Elimination System (TPDES) General Permit NO. TXR150000." This certification is signed in reference to the SWPPP associated with BMSC/Naterra Corporate HQ in Coppell, TX. Name: Title: Signature: Date: April 29, 2013 TEXAS COMMISSION ON ENVIRONMENTAL QUALITY Storm Water & General Permits Team; MC 228 PO Box 13087 Austin, TX 78711 -3087 RE: Compliance with Texas Administrative Code 305.128 Executive Director: Please be advised that for the project: BMSC/Naterra Corporate HQ in Coppell, TX any Inspector for SWPPP INSPECTIONS, INC. is the duly authorized representative to sign all inspection reports requested by TXRI50000; and any assigned Project Manager, Superintendent, and/or erosion control subcontractor for DUKE CONSTRUCTION LIMITED PARTNERSHIP is the duly authorized representative to sign all other reports requested by TXR150000. If there are any questions, or further information is needed, please contact me. "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 upon my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information is, to the best of my knowledge and belief true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." April 30, 2013 TEXAS COMMISSION ON ENVIRONMENTAL QUALITY Storm Water & General Permits Team; MC 228 PO Box 13087 Austin, TX 7871 1 -3087 RE: Compliance with Texas Administrative Code 305.128 Executive Director: Please be advised that for the project: BMSC/Naterra Corporate HQ in Coppell, TX any Inspector for SWPPP INSPECTIONS, INC. is the duly authorized representative to sign all inspection reports requested by TXR150000; and any assigned Project Manager, Superintendent, and /or erosion control subcontractor for DUKE CONSTRUCTION LIMITED PARTNERSHIP is the duly authorized representative to sign all other reports requested by TXR150000. r If there are any questions, or further information is needed, please contact me. Sincerely, OP�Vjk- Y "l Jin K. Song CEO SFPLP Holdings Management LLC "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 upon my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." GEOTECHNICAL ENGINEERING REPORT PROPOSED BMSC /NATERRA FACILITY SE CORNER OF WRANGLER DRIVE AND FREEPORT PARKWAY COPPELL, TEXAS Prepared For. Duke Realty 14241 Dallas Parkway, Suite 1000 Dallas, Texas 75254 Attention: Mr. Brian Pierce April 2013 PROJECT NO. 13 -18166 . GEOTECHNICAL ENGINEERING - CONSTRUCTION MATERIALS TESTING I - ENVIRONMENTAL CONSULTING - FORENSIC ENGINEERING DALLAS /FORT WORTH 8908 AMOASSADOR HOW DALLAS, TEXAS 78247 TELEPHONE 214. 830 -9749 TELEPHONE 817- 284 -1318 FACSIMILE Z14- 030.9819 HOUSTON 7701 WEST LITTLE YORK SUITE 600 HOUSTON, TEXAS 77040 TELEPHONE 719- 996.9979 FACSIMILE 713- 996.9972 AUSTIN 4221 FRRIORICH LANE ..... ..SUITE 1,98... . _�.... .. _ AUSTIN, TEXAS 78744 TELEPHONE 512- 482.2788 FACSIMILE 812- 462 -1158 April 12, 2013 Mr. Brian Pierce Duke Realty 14241 Dallas Parkway, Suite 1000 Dallas, Texas 75254 Re: Geotechnical Engineering Report Proposed BMSC /Naterra Facility SE Corner of Wrangler Drive and Freeport Parkway Coppell, Texas Rone Project No. 13 -18166 Dear Mr. Pierce: Submitted herewith are the results of a geotechnical investigation conducted for the referenced project. This investigation was performed in accordance with our proposal P- 18094 -13 (revised) dated March 20, 2013. This report presents engineering analyses and recommendations for site grading, foundations and pavements. Results of our field and laboratory investigation are submitted in detail in the Appendix section of the report. We appreciate the opportunity to be of service to you on this project. Please contact us if you have any questions or need any additional services. Respectfully Submitted, Texas Engineering Firm License No. F -1572 i-6Ir Mark D. Gray, P.E. Vice President IrG1 311=t•]Yp—T•].k1:4.k &? Paqe 1.0 INTRODUCTION .......................................................................................... ..............................1 2.0 PURPOSES AND SCOPE OF STUDY .................................. ............................... 1 3.0 FIELD OPERATIONS AND LABORATORY TESTING ............. ............................... 1 4.0 GENERAL SITE CONDITIONS ................................................. ............................... 2 4.1 Site Description ..................................................................... ............................... 2 4.2 Site Geology .......................................................................... ............................... 2 4.3 Subsurface Soil and Rock Conditions .................................... ............................... 2 4.4 Groundwater .......................................................................... ............................... 3 5.0 ANALYSIS AND RECOMMENDATIONS .................................. ............................... 3 5.1 Seismicity Site Class ............................................................. ............................... 3 5.2 Potential Vertical Soil Movements .......................................... ............................... 3 5.3 Preparation of Site ................................................................. ............................... 4 5.4 Foundation Recommendations .............................................. ............................... 4 5.4.1 General Discussion ......................................................... ............................... 4 5.4.2 Drilled Pier Foundations .................................................. ............................... 5 5.4.3 Construction Considerations for Drilled Piers .................. ............................... 5 5.4.4 Grade Beams/Tilt Wall Panels — Drilled Pier Foundations .............................. 6 5.4.5 Interior Floor System ....................................................... ............................... 6 5.5 Subgrade Treatment to Reduce Soil Movement ..................... ............................... 7 5.5.1 Water Injection ................................................................ ............................... 7 5.5.2 Select Fill ........................................................................ ............................... 8 5.6 Pavement Design Recommendations .................................... ............................... 8 5.7 General ................................................................................... .............................10 6.0 GENERAL EARTHWORK RECOMMENDATIONS .................... .............................11 6.1 Site Grading ............................................................................ .............................11 6.2 Fill Materials ........................................................................... .............................12 6.3 Density Tests .......................................................................... .............................12 7.0 CONSTRUCTION OBSERVATIONS ......................................... .............................12 8.0 REPORT CLOSURE .................................................................. .............................13 APPENDIX A Plate VICINITYMAP .................................................................................................. ............................A.1 GEOLOGYMAP ............................................................................................... ............................A.2 BORING LOCATION DIAGRAM ...................................................................... ............................A.3 LOGSOF BORING ....................................................................................... .......................A.4 -A.17 UNIFIED SOIL CLASSIFICATION SYSTEM .................................................. ...........................A.18 KEY TO CLASSIFICATIONS AND SYMBOLS .............................................. ...........................A.19 SWELLTABLE ................................................................................................ ...........................A.20 APPENDIX B FIELDOPERATIONS ................................................................................... ............................... B -1 LABORATORY TESTING ............................................................................ ............................... B -2 WATER PRESSURE INJECTION ................................................................ ............................... B -3 GEOTECHNICAL ENGINEERING REPORT PROPOSED BMSC /NATERRA FACILITY SE CORNER OF WRANGLER DRIVE AND FREEPORT PARKWAY COPPELL, TEXAS 1.0 INTRODUCTION The project is located at the southeast corner of Wrangler Drive and Freeport Parkway in Coppell, Texas. We understand the project consists of developing a new manufacturing /warehouse /office facility for BMSC and Naterra companies, with associated paved parking and drive areas. The structure will cover a plan area of about 245,000 square feet. Warehouses for each division will comprise about 75,000 square feet on each end of the building. The center area will be used for manufacturing and offices. A site vicinity map and geological map are attached as Plates A.1 and A.2, respectively. The general location and orientation of the site are shown on the Boring Location Diagram, Plate A.3, in the Appendix section of this report. 2.0 PURPOSES AND SCOPE OF STUDY The principal purposes of this investigation were to evaluate the general soil and rock conditions at the proposed site and to develop geotechnical recommendations for the design and construction of foundations, floor slabs, and pavements for the project. To accomplish its intended purposes, the study was conducted in the following phases: (1) drilled sample borings to evaluate the soil and rock conditions at the boring locations and to obtain soil and rock samples; (2) conducted laboratory tests on selected samples recovered from the borings to establish the pertinent engineering characteristics of the foundation soils and rock; and (3) performed engineering analyses, using field and laboratory data, to develop foundation design criteria. 3.0 FIELD OPERATIONS AND LABORATORY TESTING Soil and rock conditions were determined by a total of 14 sample borings. Ten of the borings (B -1 through B -10) were completed in the proposed building area to depths of about 40 to 45 feet below existing grades. The remaining four borings (B -11 through B -14) were completed in the proposed pavement areas to depths of about 5 feet. Project No. 13 -18166 Page 1 The borings were completed in March and April of 2013 and their approximate locations are shown on Plate A.3. Sample depth, description of soils and rock, and classification (based on the Unified Soil Classification System) are presented on the Logs of Boring, Plates A.4 through A.17. Keys to terms and symbols used on the logs are shown on Plates A.18 and A.19. Swell test results are shown on Plate A.20. Laboratory soil tests were performed on selected samples recovered from the borings to verify visual classification and determine the pertinent engineering properties of the soils encountered. Classifications test results are presented on the Logs of Boring. Descriptions of the procedures used in the field and laboratory phases of this study are presented in the Appendix of this report. 4.0 GENERAL SITE CONDITIONS 4.1 Site Description The site consists of an undeveloped lot. At the time of our field exploration, the site was in use as an agricultural crop. The existing ground surface within the project site was relatively flat. 4.2 Site Geology Based upon the Geologic Atlas of Texas, Dallas Sheet, this site appears to be located in the Eagle Ford formation. The Eagle Ford formation generally consists of gray shale that weathers to form highly plastic clay soils near the surface. Descriptions of the various strata and their approximate depths and thickness are shown on the boring logs. Stratification boundaries on the boring logs represent the approximate location of changes in soil and rock types; in -situ, the transition between materials may be gradual. A brief summary of the stratigraphy indicated by the borings is given below. 4.3 Subsurface Soil and Rock Conditions The borings generally encountered brown and dark gray, fat clay (CH) to depths of about 8.5 to 9 feet in the building borings (6-1 through B -10) and to boring termination depths of about 5 feet in the pavement borings (B -11 through B -14). Beneath the fat clays, the building borings encountered light brown and gray, shaley fat clay (CH) to depths of about 24 to 27 feet, followed by gray shale to boring termination depths of about 40 to 45 feet. Project No. 1348186 Page 2 The Plasticity Index of the clay samples tested ranged from 47 to 62, indicating high to very high soil plasticity. A high Plasticity Index is generally associated with a high potential for swelling. 4.4 Groundwater The borings were advanced using auger drilling and intermittent sampling methods in order to observe groundwater seepage levels. Groundwater seepage was encountered during drilling in some of the borings at depths of 18.5 to 24 feet and remeasured at depths of about 20 to 25 feet. The remaining borings did not produce water during drilling and the borings appeared dry at completion of drilling. It is difficult to accurately predict the magnitude of subsurface water fluctuations that might occur based upon short-term observations. Groundwater can be encountered within the clays, particularly during wet periods of the year. Based on our local experience, groundwater should be anticipated during the construction phase of this project. Groundwater levels should be expected to fluctuate throughout the year with variations in precipitation, runoff, and the water levels in nearby surface water features. 5.0 ANALYSIS AND RECOMMENDATIONS 5.1 Seismicity Site Class The site class for seismic design is based on several factors that include soil profile (soil or rock), shear wave velocity, density, relative hardness, and strength, averaged over a depth of 100 feet. The borings for this project did not extend to a depth of 100 feet; therefore, we assumed the soil conditions below the depth of the boring to be similar to those encountered at the termination depth of the boring. The project site is classified as Site Class "C" (soft rock/stiff soil profile) in accordance with Table 1613.5.2 "Site Class Definitions" of the 2009 International Building Code (IBC). 5.2 Potential Vertical Soil Movements Potential Vertical Movement calculations were performed in general accordance with the Texas Department of Transportation (TxDOT) Method 124 -E. The TxDOT 124 -E method is empirical and is based on the Atterberg limits and moisture content of the subsurface soils. Swell test results were also used in the estimation of the PVR. Project No. 1348166 Page 3 The Potential Vertical Rise (PVR) calculated using the TOOT method is about 5 to 7 inches, based on in -situ soil being at a dry antecedent condition and existing site grades at the time of our drilling. At the time of drilling, the soils at the borings were mostly in a dry to slightly moist condition and results of the free swell tests indicate swell potentials in line with expectations. 5.3 Preparation of Site Preparation of the site for any future construction should include the removal and proper disposal of all obstructions that would hinder construction. These obstructions should include all abandoned structures, foundations, debris, water wells, septic tanks and loose material. It is the intent of these recommendations to provide for the removal and disposal of all obstructions not specifically provided for elsewhere by the plans and specifications. All concrete, trees, stumps, brush, abandoned structures, roots, vegetation, rubbish and any other undesirable matter should be removed and disposed of properly. It is the intent of these recommendations to provide a loose surface with no features that would tend to prevent uniform compaction by the equipment to be used. The exposed subgrade should be proofrolled with a fully loaded tandem axle dump truck or similar pneumatic -tire equipment to locate areas of loose subgrade. In areas to be cut, the proofroll should be performed after the final grade is established. In areas to be filled, the proofroll should be performed prior to placement of engineered fill and after subgrade construction is complete. Areas of loose or soft subgrade encountered in the proofrolling should be removed and replaced with engineered fill, or moisture conditioned (dried or wetted, as needed) and compacted in place. After completing proofrolling, and before placing any fill, the exposed surface should be disced or bladed to a minimum depth of 6 inches until uniform and free from large clods, brought to a moisture content within 2 percentage of the optimum moisture value, and compacted to at least 95 percent of maximum dry density in accordance with ASTM D698. 5.4 Foundation Recommendations 5.4.1 General Discussion Based on the conditions encountered in our borings and anticipated loading conditions, the structural loads of the proposed building may be supported on a straight sided drilled shaft Project No. 13 -18166 Page 4 foundation system. An interior grade - supported floor slab may also be used provided measures are taken to reduce the PVR to more tolerable levels. Moisture - conditioning of 10 feet of active clay soils capped with 2 feet of select fill will be required to achieve the desired movement levels. Recommendations for foundation systems and subgrade treatment are described in the following sections. 5.4.2 Drilled Pier Foundations Drilled pier foundations can be utilized to support the structural loads of the proposed structure. Auger- excavated, straight shaft, steel reinforced, cast -in -place concrete piers, founded in the gray shale (encountered at depths of about 24 to 27 feet in our borings) may be used for the structure. The piers should extend through and below any soft shale or clay layers and bear in competent shale. These piers may be designed using a net allowable end bearing pressure of 15,000 pounds per square foot. An allowable skin friction of 2,250 pounds per square foot may be used for the portion of the pier extended below a minimum penetration of 3 feet into the gray shale. Foundation settlement for drilled piers on the gray shale should be less than %Z inch. The uplift force on the piers due to swelling of the active clays can be approximated by assuming a uniform uplift pressure of 2,200 psf acting over the perimeter of the shaft to a depth of 12 feet below final pad elevation. The uplift pressure may be reduced to 1,200 psf acting over the perimeter of the shaft within re- worked, moisture - conditioned soils. Uplift forces should not be developed on piers penetrating through materials classified as select fill. The shafts should contain sufficient full length reinforcing steel to resist uplift forces. The uplift force can be resisted by the dead load on the shafts plus the allowable skin friction resistance in the portion of the shaft embedded in the shale described above. Based on anticipated loads, we recommend a minimum shaft size of 24 inches. Adjacent piers should have a minimum center -to- center spacing of 3 shaft diameters (based on diameter of the larger shaft) for uplift design purposes. Closer pier spacing could result in reduced uplift resistance. We should be contacted to review closer pier spacing on a case by case basis. 5.4.3 Construction Considerations for Drilled Piers The construction of all piers should be observed as a means to verify compliance with design assumptions and to verify: Project No. 13 -18166 Page 5 1) the bearing stratum; 2) the minimum penetration into gray shale; 3) the removal of all smear zones and cuttings; 4) that groundwater seepage, when encountered, is correctly handled; and 5) that the shafts are vertical (within the acceptable tolerance). Groundwater seepage was observed in some of the building borings during the drilling operations and the possibility of groundwater seepage should be considered high during pier drilling. Temporary casings will be required to control seepage and caving of variable materials and conditions. The casing should be seated in the shale below the seepage, and all water should be removed from the shaft excavation before beginning the design rock penetration. Any portion of the shale above the bottom of the casing should be neglected in the design penetration. Concrete should be placed immediately after the excavation has been completed. In no event should a pier excavation be allowed to remain open for more than 8 hours. Concrete should have a slump of 5 to 7 inches, and should not be allowed to strike the shaft sidewall or steel reinforcement during placement. 5.4.4 Grade Beams/Tilt Wall Panels — Drilled Pier Foundations Grade beams/tilt wall panels should be structurally connected into the top of the piers. Provided that subgrade treatment is completed, a minimum void space of 4 inches should be provided beneath the grade beams/ tilt wall panels and the underlying soil between piers. This void space allows movement of the soils below the grade beams /panels without distressing the structure. The excavation in which the void box lays must remain dry. In addition, backfill material must not be allowed to enter the void area below grade beams /panels, since this reduces the void space. Typically, a soil retainer in the form of a thin pre -cast panel or pieces of wood is placed along the outside edge of the grade beams /panels to prevent the aforementioned soil intrusion. On -site soil then may be placed against the sides of the grade beams /panels. 5.4.5 Interior Floor System If some movement can be tolerated, the floor slab can be ground supported provided subgrade treatment is completed as described below. The floor slab should consist of an independent slab Project No. 13 -18166 Page 6 not rigidly connected to the building walls, columns or foundations. If the floor slab is rigidly connected to the building walls, a hinge crack may develop in the slab parallel to the wall at a short distance from the wall. The severity of the cracking will depend on the amount of movement that occurs, the rigidity of the floor slab and the rigidity of the connection. In extreme cases, excessive movement and cracking of walls and foundations could occur if the connection to the floor slab is sufficiently rigid. Subgrade treatment is described below. 5.5 Subgrade Treatment to Reduce Soil Movement A PVR of up to about 7 inches should be anticipated at this site based on current site conditions. Therefore, subgrade treatment will be required to limit the PVR and support interior floor slabs on grade. Completing 10 feet of water injection in conjunction with a 2 foot select fill cap should reduce the anticipated PVR to about 1 inch. Recommendations for water injection and select fill specifications are provided below. 5.5.1 Water Injection Subgrade treatment can consist of water pressure injection capped with select fill. The water injection process should extend at least 5 feet outside the structure footprint, or any other areas sensitive to differential movement. After injection, the moisture - conditioned soils should be capped with 2 feet of select fill. Guidelines and suggested specifications for injection are included in the appendix of this report. Multiple injections are typically required to obtain the desired moisture levels, and the time and expense for these injections should be included in the project schedule and budget. Also, hard clays can be encountered (especially during dry times of the year) which can be difficult for injection rods to penetrate. Heavy duty injection equipment and /or a reduction in the number of injection rods may be necessary to achieve the recommended injection depth. There is a tendency for the subgrade to dry out after the Subgrade treatment is complete. The injected- conditioned clays should be covered with select fill immediately after completion of the subgrade treatment, and the select fill surface should be kept moist prior to slab construction. A vapor barrier should be used beneath the portions of the floor slab that will be covered, carpeted, or sealed. Project No. 1348166 Page 7 5.5.2 Select Fill Select fill should consist of a sandy clay or clayey sand with a liquid limit less than 35 and plasticity index (PI) between 5 and 15. The fill should be placed in loose lifts less than 10 inches thick, and compacted to a minimum of 95 percent of the material's maximum standard Proctor dry density (ASTM D698). The moisture content of the select fill should be within 2 percentage points of the optimum moisture content as determined by the standard Proctor test. Lime - treated, on -site soils may also be used as the select fill cap, provided the PI of the material meets the specifications for select fill. We anticipate 8 to 10 percent lime may be required. The actual percentage of lime should be determined once soils have been stockpiled and sampled. Crushed limestone or concrete can also be used as select fill. The crushed limestone or concrete should meet the requirements of TxDOT Standard Specifications Item 247, Grade 3, Type A. The material should be compacted in maximum 6 -inch compacted lifts to a minimum of 95 percent of the material's Standard Proctor maximum dry density, at a moisture content of -2 to +2 percentage points of optimum. 5.6 Pavement Design Recommendations When designing proposed pavement sections for driveways and parking areas, subgrade conditions must be considered along with expected traffic use /frequency, pavement type, and design period. For this project, traffic loading and frequency conditions were assumed for various conditions as no specific traffic information was provided. The following information and assumptions were used in our analysis: (1) 15,000 annual equivalent single axle (ESAL) repetitions for parking areas; (2) 35,000 annual ESAL repetitions for driveways; (3) 90,000 annual ESAL repetitions for light traffic truck/dumpster areas; (4) A concrete modulus of rupture of 650 psi; (5) A design life of 20 years; (6) Initial serviceability, po, of 4.5 and a terminal serviceability, pt, of 2.0 for concrete pavements; (7) A k -value of 100 pci for subgrade consisting of clay soils and 150 pci for lime- treated subgrade. Project No. 13 -18166 Page 8 The pavement thickness determinations were performed in accordance with the "AASHTO Guide for the Design of Pavement Structures (current edition)" guidelines. The minimum pavement sections are presented in the table below. These pavement sections are estimates based on assumed traffic volumes. A more precise design can be made with detailed traffic loading information. Concrete with a minimum 28 day compressive strength of 3,500 pounds per square inch should be used. As a minimum, reinforcing steel should consist of #3 bars spaced at a maximum of 18 inches on centers in both directions. Subgrade preparation for pavements should follow the recommendations provided in Section 5.3 Preparation of Site given earlier in this report. Lime treatment of the pavement subgrade is recommended for PCC pavements subjected to light semi -truck traffic (7 inch pavement sections). In small localized areas (dumpster pads, etc.), it may not be practical to perform lime treatment. In these areas, the concrete thickness may be increased by one (1) inch and lime treatment omitted. Increased periodic maintenance (i.e. sealing of cracks /joints) is critical to the long -term performance of the pavement in areas without subgrade treatment. Lime treatment will improve pavement performance for the 5- and 6 -inch PCC sections; however, it is not required. Periodic maintenance (i.e. sealing of cracks and joints) should be performed to prevent water intrusion into the underlying clay subgrade. The pavement surface should be contoured such that surface water drains off and away from the pavement or into inlets. Water Project No. 13 -18166 Page 9 ;;Portland Cement Traffic "Use Annual ESAL Count i Concrete (PCC) Thickness (inches); Parking Areas for Autos 15,000 5 and Light Trucks Drive Lanes for Autos and 35,000 6 Light Trucks /Fire Lanes Light Semi -Truck 90,000 7 Traffic / Dumpster Areas Concrete with a minimum 28 day compressive strength of 3,500 pounds per square inch should be used. As a minimum, reinforcing steel should consist of #3 bars spaced at a maximum of 18 inches on centers in both directions. Subgrade preparation for pavements should follow the recommendations provided in Section 5.3 Preparation of Site given earlier in this report. Lime treatment of the pavement subgrade is recommended for PCC pavements subjected to light semi -truck traffic (7 inch pavement sections). In small localized areas (dumpster pads, etc.), it may not be practical to perform lime treatment. In these areas, the concrete thickness may be increased by one (1) inch and lime treatment omitted. Increased periodic maintenance (i.e. sealing of cracks /joints) is critical to the long -term performance of the pavement in areas without subgrade treatment. Lime treatment will improve pavement performance for the 5- and 6 -inch PCC sections; however, it is not required. Periodic maintenance (i.e. sealing of cracks and joints) should be performed to prevent water intrusion into the underlying clay subgrade. The pavement surface should be contoured such that surface water drains off and away from the pavement or into inlets. Water Project No. 13 -18166 Page 9 allowed to pond on or adjacent to pavement surfaces could saturate the subgrade soils leading to premature pavement failure. The existing soils are plastic and can undergo some volume change when subjected to moisture variations. If the moisture contents of these upper soils reduce, they may shrink and cracks may develop. If the moisture content of these materials increases, they could swell and lose strength. Shrinkage, swelling, or strength loss could be detrimental to the proper function of the pavement. Lime treatment of clay subgrade will provide more uniform subgrade support and improve these soil's strength characteristics. Where used, we recommend a minimum of 8 percent lime (by dry soil weight) to a depth of 6 inches. Exact percentages should be determined once pavement grades are established in the field. Lime stabilization should be performed in accordance with Item 260, current Standard Specifications for Construction of Highways. Streets. and Bridges. Texas Department of Transportation (TxDOT) or applicable standards. The readers should understand that lime stabilizing the upper 6 inches of the subgrade soils will not reduce the shrinking and swelling of the subgrade, which normally occurs with the seasonal moisture fluctuations. Therefore, some differential vertical movements of the pavements should be expected. J Water can be introduced beneath the pavement through granular materials used for aggregate bases and utility line embedment, and can cause differential movement in the pavement. Aggregate base or a granular leveling course should not be used beneath pavements, and all utilities should have clay plugs substituted for granular embedment material at the edges of the pavement to reduce the risk of moisture access and possible swelling. Pavement recommendations are based on the assumed loading conditions and commonly accepted design procedures that should provide satisfactory performance for the design life of 20 years for the assumed traffic loadings. The concrete pavement should have between 4 and 6 percent entrained air. Hand - placed concrete should have a maximum slump of six inches. A sand - leveling course should not be permitted beneath pavements. All steel reinforcement, dowel spacing /diameter, and pavement joints should conform to applicable city standards. 6.7 General All grade supported slabs should be designed to accommodate anticipated potential movements as presented in the section titled "Potential Vertical Soil Movements" earlier in this report. Project No. 13 -18166 Page 10 Every attempt should be made to limit the extreme wetting or drying of the subsurface soils because swelling and shrinkage of these soils will result. Standard construction practices of providing good surface water drainage should be used. A positive slope of the ground away from any foundation should be provided. Also, ditches or swales should be provided to carry the run -off water both during and after construction. Lawn areas should be watered moderately, without allowing the clay soils to become too dry or too wet. Roof runoff should be collected by gutters and downspouts, and should discharge away from the building. Backfill for utility lines or along the perimeter beams should consist of site - excavated soil. If the backfill is too dense or too dry, it will swell and a mound will form along the trench line. If the backfill is too loose or too wet, it will settle and a sink will form along the trench line. Backfill should be compacted as recommended in the section titled "General Earthwork Recommendations" below. If granular material is used for embedment in utility trenches we recommend placing a clay plug, as a replacement for the granular embedment, at the location where the city line is located, at the location where the utility enters the structure and at other connections. The intent is to stop any free moisture from passing through the granular embedment and entering the soil beneath the structure. Root systems from trees and shrubs can draw a substantial amount of water from the clay soils at this site, causing the clays to dry and shrink. This could cause settlement beneath grade - supported slabs such as floors, walks and paving. Trees and large bushes should be located a distance equal to at least one -half their anticipated mature height away from grade slabs. All excavations should be sloped, shored, or shielded in accordance with OSHA requirements. 6.0 GENERAL EARTHWORK RECOMMENDATIONS 6.1 Site Grading Site grading operations, where required, should be performed in accordance with the recommendations provided in this report. The site grading plans and construction should strive to achieve positive drainage around all sides of the proposed building. Inadequate drainage around structures built on -grade will cause excessive vertical differential movements to occur. Project No. 13 -18166 Page 11 6.2 Fill Materials Materials to be used for general site fill should consist of on -site material approved by the Soils Engineer. Imported general site fill should have a liquid limit less than 60 and should be approved by the Soils Engineer. There should be no roots, vegetation or any other undesirable matter in the soil, and no rocks larger than 4 inches in diameter. The fill material should be placed in level, uniform layers, which, when compacted, should have a moisture content and density conforming to the stipulations called for herein. Each layer should be thoroughly mixed during spreading to provide uniformity of the layer. The fill thickness should not exceed 10 -inch loose lifts. Prior to and in conjunction with the compacting operation, each layer should be brought to the proper moisture content as determined by ASTMD698. We recommend the clay soils be moisture conditioned to a moisture content that is between optimum and 4 percentage points above optimum. After each layer has been properly placed, mixed and spread, it should be thoroughly compacted to between 95 and 100 percent of Standard Proctor Density as determined by ASTM D698. 6.3 Density Tests Field Density tests should be made by the Soils Engineer or his representative. Density tests should be taken in each layer of the compacted material below the disturbed surface. If the materials fail to meet the density specified, the course should be reworked as necessary to obtain the specified compaction. 7.0 CONSTRUCTION OBSERVATIONS In any geotechnical investigation, the design recommendations are based on a limited amount of information about the subsurface conditions. In the analysis, the geotechnical engineer must assume the subsurface conditions are similar to the conditions encountered in the borings. However, during construction quite often anomalies in the subsurface conditions are revealed. Therefore, it is recommended that Rone Engineering Services, Ltd. be retained to observe earthwork and foundation installation and perform materials evaluation and testing during the construction phase of the project. This enables the geotechnical engineer to stay abreast of the Project No. 13 -18166 Page 12 project and to be readily available to evaluate unanticipated conditions, to conduct additional tests if required and, when necessary, to recommend alternative solutions to unanticipated conditions. Until these construction phase services are performed by the project geotechnical engineer, the recommendations contained in this report on such items as final foundation bearing elevations, final depth of undercut of expansive soils for non - expansive earth fill pads, and other such subsurface - related recommendations should be considered as preliminary. It is proposed that construction phase observation and materials testing commence by the project geotechnical engineer at the outset of the project. Experience has shown that the most suitable method for procuring these services is for the owner to contract directly with the project geotechnical engineer. This results in a clear, direct line of communication between the owner and the owner's design engineers, and the geotechnical engineer. 8.0 REPORT CLOSURE The analyses, conclusions and recommendations contained in this report are based on site conditions as they existed at the time of the field investigation and further on the assumption that the exploratory borings are representative of the subsurface conditions throughout the site; that is, the subsurface conditions everywhere are not significantly different from those disclosed by the borings at the time they were completed. If during construction, different subsurface conditions from those encountered in our borings are observed, or appear to be present in excavations, we must be advised promptly so that we can review these conditions and reconsider our recommendations where necessary. If there is a substantial lapse of time between submission of this report and the start of the work at the site, if conditions have changed due either to natural causes or to construction operations at or adjacent to the site, or if structure locations, structural loads or finish grades are changed, we urge that we be promptly informed and retained to review our report to determine the applicability of the conclusions and recommendations, considering the changed conditions and /or time lapse. Further, it is urged that Rone Engineering Services, Ltd. be retained to review those portions of the plans and specifications for this particular project that pertain to earthwork and foundations as a means to determine whether the plans and specifications are consistent with the recommendations contained in this report. In addition, we are available to observe construction, particularly the compaction of structural fill, or backfill and the construction of foundations as recommended in the report, and such other field observations as might be necessary. Project No. 13 -18166 Page 13 This report has been prepared for the exclusive use of Duke Realty, and their designated agents for specific application to design of this project. We have used that degree of care and skill ordinarily exercised under similar conditions by reputable members of our profession practicing in the same or similar locality. No warranty, expressed or implied, is made or intended. Project No. 1348166 Page 14 0 0 0 SCALE:NTS ® ® one gineerin PLATEA.1 VICINITY MAP FILENAME: 1318166.DWG DRAWN BY: CM DATES 4 -5 -2013 BMSC / NATERRA FACILITY REVISED BY: DATE: SEC WRANGLER DR 8 FREEPORT PKWY REVISED BY: DATE: COPPELL, TEXAS APPROVED BY: MG DATE: 4-5 -2013 �,w�., ,- 8 L\l §_ C-4 20, ww LL 9 Z Cl) 4 0 LL 04 L, if UP G C� a U-3 .16 0 0 w z M a 0 w (a o D C Cc IM%LU LU < z a w a > w z U) U) ■ LLI -i > w a. EL- 0 w w < ON am L\l §_ 20, ww LL 9 Z W 4 0 LL L, if UP a U-3 -0 -j 0 0 w z M 0 w (a ON am r Project No. Boring No. BMSC / Naterra Facility Engineering— —� 13 -18166 B- 1 Cov ell Texas Location Water Observations Building Groundwater seepage was encountered at a depth of about 23' while Completion Completion drilling, and was remeasured at a depth of about 22' at the completion Depth 45 Date 3 -29 -13 of drilling. Surface Elevation Type CFA s w a5 a U. dE m A Stratum Description o g m � R g,? a ei a m� w �E 3 O E a ' Cr IL 0: 09 ay E nC.— §8 FAT CLAY (CM - dark gray 3.0 31 2.5 94 89 30 59 33 4.5+ 31 91 2940 5 4.25 28 4.0 29 3.5 91 78 28 50 30 SHALEY CLAY ( - light brown and gray, with 3.25 29 1 calcareous nodules 4.25 30 IS 4.5+ 30 2 1 3.75 29 25 SHALE - gray ® = 5015.5 20 3 _ 00/5.25' � 35 — o a 00/4.25' c� iS — 2-45— 2 Boring Teanmated at 45 Feet gz_ 6 LOG OF BORING NO. B- 1 Plate A.4 Pro- cctNo. Boring No. MS BC Nxas Facility _ 'Rorie Englneerin MEMMUMMEM 13 -18166 B. 2 Co eu Texas Location Water Observations Building Groundwater seepage was encountered at a depth of about 18.5' while Completion Completion drilling. Upon completion of drilling, the boring appeared to be dry. Depth 45.0' Date 3 -29 -13 Surface Elevation Type CFA U C p N C W $ a LL Dl 3 C $ Stratum Description 9 m m' Z x € a -S e � N O pp �v O aE � tip (US. i a a =C 00 FAT AY ( - dark gray and brown 2.25 31 2.25 32 3.25 91 84 29 55 28 q 3.75 28 3.75 30 93 2410 3.0 31 1 SHALEY CLAY (CH) - gray and light brown, wish wµ 3.75 91 75 27 48 30 calcareous nodules 4.5+ 29 15 _F 4.25 32 2 2.75 31 25 _gray = 50/4.2 " 23 3 — a 10015.75' �a 35 0 W z - a _ 100/3.75' 4 — 2— i . 100/3.0" 45 Boring Terminated at 45 Feet LOG OF BORIlVG NO. B- 2 Plate A.5 Project No. Boring No. mn — B14ISC / Naterra Facility Rone Engineerin— 13 -18166 B- 3 Co ell Texas Location Building Water Observations Groundwater seepage was encountered at a depth of about 22' while Completion Completion Date drilling. Upon completion of drilling, the boring appeared to be dry. Depth 40.0' 3 -29 -13 Surface Elevation Type CFA U. — Mca CY s+ Ga Stratum Description p 0 * � „a� V ea eve Ji m 32 QE �? ce kV 0 am 77 FAT MY ( dark gray 2.75 91 78 27 51 28 2.75 34 3.75 30 5 4.0 30 4.25 93 83 30 53 31 3.25 30 SHALEY Y (M - light brown and gray, with 4.25 32 1 calcareous nodules 4.0 33 -T.-15 4.5+ 28 2 00/5.75' 25y ° W 100/4.75' 3 h ® 100/3.75' 35 0 R— 100!2.0" 0 Boring Terminated at 40 Feet m N a LOG OF BORING NO. B- 3 Plate A.6 Project No. 13 -18166 Borin g No. B- 4 "'�1° `..b...��.... BMSC / Naterra Facility � Co ell Texas Location Wil ing Water Observations Groundwater seepage was encountered at a depth of about 23' while drilling, and was remeasured at a depth of about 20' at the completion of drilling. Completion Depth 40.0' Completion Date 4 -1 -13 Surface Elevation Type CFA w g' m ai o.� -, t m c� 09 o _ d dus c E 37 U e J E K:3 0' J a_ � i^'� o a m4 E in 08M Stratum Description FAT CLAY (CH) - dark gray 2.75 311 1 3.25 321 1 3.5 301 1 5 4.5+ 88 79 27 52 27 4.0 28 4.0 30 1 SHALEY CLAY (CH) light brown and gray, with calcareous nodules 3.75 30 4.0 28 IS 2 4.5+ 30 .SL 4,5+ 1 31 25 — SHALE - gray 100/7.25' — 100/4.5' 3 — 35 —_ — 10014.5" 00/3.25' 4 io Boring Terminated at 40 Feet J LOG OFBOMNG NO. Br 4 Plate A.7 Project No. Boring No. BMSC /NaterraFacility Rone Engineerin 13 -18166 B- 5 Co ell Texas Location Building Water Observations Groundwater seepage was not observed while drilling, and the borehole Completion Completion appeared dry at completion. Depth 40.0' Date 4 -3 -13 Surface Elevation Type CFA w L G = •6. LL I N m C r� CA St D i lion Stratum Description P ae Ig � �? �' 3 Uj CL S7 CL 40e h� a10.�i Jg8 FAT CLAY (CH) - ark gray, with calcareous 1. 38 nodules 2.0 33 3.5 94 79 2 51 28 5 4.5+ 29 4.0 29 3.25 29 ..HALEY ( - light brown an gray, with 3,25 31 1 calcareous nodules 4.0 31 15 4.0 32 2 S - gray - 100/5.75' — 25 3 ®_ 00/2.75' 35 - _ 'a _ 10011.5" —40— m Boring Terminal at 40 Feet N 8 LOG OF BORING NO. B- 5 Plate A.8 Project No. 13 -18166 Boring No. B- 6 BW C / Naterra Facility Kv tg new Co ell Texas Location Building Water Observations Groundwater seepage was encountered at a depth of about 24' while drilling, and was remeasured at a depth of about 23' at the completion of drilling. Completion Depth 40.0' I Completion 1 Date 4.1.13 w Co Surface Elevation Type CFA w a: ` U. E m C6 m m �v wF- z'°� It E E of r c I a cE'G a Cn Stratum Description FAT CLAY (CEO - dark gray and brown 2.5 34 3.0 92 95 33 62 311 1 3.75 211 1 5 4.5+ 29 4.5+ 88 79 27 52 29 3.0 31 SHALEY CLAY (CH) - light brown and gray, with 4.5+ 29 1 calcareous nodules 4.5+ 1 1 29 15 4.5+1 1 29 2 1 1Z. 4.5+ 1 29 25 — SHALE - gray 100/7.5" — 00/5.25' 3 — = 104.25' o —40,— — 100/3.0" Boring Terminated at 40 Feet J LOG OF BORING NO. B- 6 Plate A.9 Project No. 13 -18166 Boring No. B- 7 BMSC /NaterraFacility rwne r-n nu Co ell Texas Location Building Water Observations Groundwater seepage was not observed while drilling; Groundwater was measured at a depth of about 25' upon completion of drilling. Completion Depth 45.0' Completion Date 4 -3.13 Surface Elevation Type CFA 1 8 ►z Stratum Description U. g C doC u' c m m V�1F gr n.tn �7 „ E= a: 0 o 94 n. FAT CLAY (CIM - dark gray and brown, with 2.0 92 75 28 47 351 calcareous nodules 1 3.0 31 4.0 27 5 4.25 26 3.75 29 3.0 29 SHALEY CI AY (M - light brown and gray, with 3.25 32 1 calcareous nodules 3.75 31 15 4.5+ 30 2 25 4.5+ 27 — SHALE - grey — 100/4.5" 3 — 3 —35—: t' — 100/3.25' L n _ 100/2.51, n 45 - Boring Terminated at 45 Fat LOG OF BORING NO. B- 7 Plate A.10 Project No, Boring No. BMSC /NaterraFacility Rone Engineerinal- -� 13-18166 B- 8 Co ell Texas Location Water Observations Building Groundwater seepage was encountered at a depth of about 23' while Com letion Completion drilling, and was remeasured at a drilling. depth of about 22' at the completion Dept 40.0' Date 4.1.13 of Surface Elevation Type CFA « r y n Stratum Description *Cr E '� E� CL c '� tx o. rnt— am 3 3 a7 a 3 C o a a FAT CLAY (CF 1) - dark gray and brown 3.5 301 1 4.25 92 86 31 55 291 1 4.5+ 25 5 3.5 26 4.0 27 3.75 91 77 2 51 29 1 SHALEY CLAY (C10) - hgbt brown and gray 4.5+ 33 4.5+ 29 15 4.5+ 29 2 1 Q 4.5+ 28 25 gay 100/7.5° 100/5.5" 3 M 100/3.75' � 35 'a 10/2.75" cs i$ 4 Boring Terminated at 40 Feet I LOG OF BORING NO. �- g _ _ _ _ _ Plate A..11 Project No. 13 -18166 Boring No. B- 9 BMSC / Naterra Facility none r`numu"Fin, — Co ell Texas ®cg Location Building Water Observations Groundwater seepage was encountered at a depth of about 23' while drilling, and was remeasured at a depth of about 21.6' at the completion of drilling. Completion Depth 45.0' I Completion 1 Date 4 -1 -13 Li Surface Elevation Type CFA V U. 9 L m d l y> 964511:93 7^r r�^3 IC:3 NoC' 0. M O 1 tl 7 4 Stratum Description FAT CLAY (M - dark gray and brown 2.25 32 3.0 92 84 31 53 32 4.25 30 5 4.0 27 4.25 29 3.0 31 SHALEY CLAY (CEO - light brown and gray, with 4.25 95 75 27 48 30 1 calcareous nodules 15 14.251 31 4.5+ 33 2 1 4.5+ 31 25 — SHALE -gray — 100/4.25' 3 — 3 100/3.25' i — 4 9 6 = — — 100/1.75' lOD /1.25' 45 Boring Terminated at 45 Feet 6 11LOGOFBORINGNO. B- 9 Plate A.12 Project No. 13 -18166 Boring No. B -10 BMSC / Naterra Facility EME M NU Co ell Texas Location Building Water Observations Groundwater seepage was encountered at a depth of about 23' while drilling. Upon completion of drilling, the boring appeared to be dry. Completion Depth 40.0' Completion Date 4.3.13 w Surface Elevation Type CFA w oG &LL mm o. ac m dv (a 10- $ Z o.H �,� 3M �� E �M o S5 m 3 S o a o d € o eo'I no a 3 Stratum Description FAT CLAY (CFI) - dark gray and brown 2.25 30 2.25 32 3.0 29 5 3.75 27 3.5 93 79 27 52 28 3.0 30 1 SHALEY CLAY (CHI) - light brown and gray, with calcareous nodules 3.25 32 3.5 1 1 1 30 15 3.75 33 2 SZ. 4.5+ j 34 — T 100/5.0" SHALE - gray 100/4.0" 3 — F 10012.5" i i 4 0 100/1.5" Boring Terminated at 40 Feet b LOG OF BORING NO. B -10 Plate A.13 Project No. Boring No. BMSC /NaterraFacility mono =nginc 13 -18166 B -11 Co ell Texas Location Pavement Water Observations Groundwater seepage was not observed while drilling, and the borehole appeared dry, at completion. Completion Completion Depth 5.oi Date 3.29.13 Surface Elevation Type CFA «_ °o Z aE .9 C d m a Stratum Description m �CL � ' -b I t a v � cEE oWC u�if a.w 33 FAT CLAY (CEO - dark gray 2.25 29 3.25 92 89 31 58 331 1 4.0 29 4.0 28 5 Boring Terminated at 5 Feet 3 • 3 L� 7 9 a fi n I LOG OF BORING NO. B-11 Plate A.14 PtojectNo B'oriag No, WASC / Naterra Fauffity R� M4M" 1 R-13 CovadLTem Location. Water-Observations PaTemeld Gronaftaier seepW was lid Observed whHe dn`Nw, and Me borehole Compp• letion: Completion aMared dky at conWhOm Date Depth _W 4,6q„13 Sil cc L%Ya6on Type CFA +► c °o L Z 3 Stm� ° � m �$ a� v �= o � . c � g' s— a �.s.s rc_ m ® �o a� QE E �, ��'� ce a<ar aF it le 33 as3 Ti'Ai MAY (M, - dark brown '. 1.25. 34 3.5 92 86 32 SAC 31 J_ 3.5 2 5 28 Boring Terminated) at 5 Feet A �I b LM OF WRM NO. B-13 PWeA. �6 Project No. Boring No. BMSC / Naterra Facility Rune cngmUUnn MMMMPJMMM 13 -18166 B -14 Co ell Texas Location Pavement Water Observations Groundwater seepage was not observed while drilling, and the borehole appeared dry at completion. Completion Completion mate Depth 5.4, 4 -3.13 Surface Elevation �Yp CFA Stratum Description �m�� a U 0� �v I ' E Jg� E � i a s i:'' o 18-a �t� a o�.tx vi F- o.v� n a_ v FAT CLAY (CM - brown, with calcareous nodules 2.0 42 76 28 48 33 4.5+ 23 3.25 1 1 28 4.5+ 1 1 24 5 Boring Terminated at 5 Feet 2 J� t C 0 Ui Ui3 LOG OF BORING NO. B -14 Plate A.17 SOIL OR ROCK TYPES ® CLAY } t7tSV S. SAND -WELL GRADED ® FAT CLAY Firm LIMESTONE- WEATHERED Hard LEAN CLAY Very Hard CONCRETE Over 50 SANDY CLAY '� ►�.' FILL LIMESTONE GRAVEL CLAYEY SAND CLAYEY GRAVEL ............................. :n.w__: SHALE - -- MARL SAND - POORLY GRADED SILT < °;" . TERMS DESCRIBING CONSISTENCY, CONDITION, AND STRUCTURE OF SOIL Fine Grained Soils (More than 50% Passing No. 200 sieve) Consistency Penetrometer Reading, (tsf) Very Soft < 0.5 Soft 0.5 to 1.0 Firm 1.0 to 2.0 Hard 2.0 to 4.0 Very Hard > 4.0 Coarse Grained Soils (More than 50% Retained on No 200 Sieve) Penetration Resistance Descriptive Item (Blows / Foot) Having inclined planes of weakness that ate slick and glossy in appearance 0 to 4 Very Loose 4 to 10 Loose 10 to 30 Medium Dense 30 to 50 Dense Over 50 Very Dense Soil Structure materials. Unconfined Compression, (psf) < 1000 1000 to 2000 2000 to 4000 4000 to 8000 > 8000 Relative Density 0 to 20% 20 to 40% 40 to 70% 70 to 90% 90 to 100 % Calcareous Contains appreciable deposits of calcium carbonate; generally nodular Slickensided Having inclined planes of weakness that ate slick and glossy in appearance Laminated Composed of thin layers of varying color or texture Fissured Containing cracks, sometimes filled with fine sand or silt Interbedded Composed of alternated layers of different soil types, usually in approximately equal proportions TERMS DESCRIBING PHYSICAL PROPERTIES OF ROCK Hardness and Degree of Cementation Very Soft or Plastic Can be remolded in hand; corresponds in consistency up to hard in soils Soft Can be scratched with fingernail Moderately Hard Can be scratched easily with knife; cannot be scratched with fingernail Hard Difficult to scratch with knife Very Hard Cannot be scratched with knife Poorly Cemented or Friable Easily crumbled Cemented Bound together by chemically precipitated material; Quartz, calcite, dolomite, siderite, and iron oxide are common cementing materials. Degree of Weathering Unweathered Rock in its natural state before being exposed to atmospheric agents Slightly Weathered Noted predominantly by color change with no disintegrated zones Weathered Complete color change with zones of slightly decomposed rock Extremely Weathered Complete color change with consistency, texture, and general appearance approaching soil KEY TO CLASSIFICATION AND SYMBOLS PLATE A.18 Major Divisions Grp. Typical Names Laboratory Classification 011@ h I eeri 1 Sym. Criteria BONN Well graded gravels, �, N 2 c, C GW gravel -sand mixtures, o ° w C = greater than 4: C = LD2 between land 3 .N m o little or no fines " °,� o�x D� m o c o U) .N 0) c, Poorly graded gravels, Not meeting all gradation requirements U �u GP gravel -sand mixtures, m for GW C14 °�,' 'm v m — little or no fines 0 (n Z o d' 2. N '~ Silty gravels, gravel - a ; can iin Liquid and Plastic limits Liquid and plastic o cn — Z m c c m a� GM sand - silt mixtures „ - limits plotting In N -y : 2 below A line or P.I. p g o, w cn W = hatched zone c o o greater than 4 C ca (a �® m N 0 rn between 4 and 7 C� 2 CL Clayey gravels, gravel � � 9 Liquid and Plastic limits are borderline ca o GC �? �. Cr above "A" line with P.I. cases requiring use m ` Q S m -sand -clay mixtures ,o w of duals symbols greater than 7 Y ` ccaa .. 0 > �, Cands, D of ...... L°E a SW Well graded � C 4m ) C6 (® ) v c o a� c w— gravelly sands, little or 9 Y c ._ , c CU= - -__ greater than 6: C = - -- between 1 and 3 m q� C 0 y H °c no fines D x D w c co m yPoorly graded sands, c ca a � m mo Not meeting all gradation requirements ®� U J SP gravelly sands, little or ° ® cD a for SW m a U no fines �, 0, " a- c ®c N Silty sands, sand silt 0 ul N P Liquid and Plastic limits Liquid and plastic mm °�ma�'i c SM mixtures vocco 2 m `cc °- below "A" line or P.I. limits plotting C ` _ C ° less than 4 between 4 and 7 ac*0 4%r T c w c rn N a o° are borderline `o E -o a ® Clayey sands, sand S N J `c' Liquid and Plastic limits cases requiring use E ca Q E Sc clay mixtures a Co above "A" line with P.I. of dual symbols m p ® a greater than 7 Inorganic silts and very fine ML sands, rock flour, silty or (n clayey fine sands, or clayey 60 C/) m silts with slight plasticity o CD E Inorganic clays of law to N c CL medium plasticity, gravelly isty cclays, 50 V Z and lean cla CH c � J ®L Organic silts and organic low 40 _ ....,. N silty clays of plasticity o U z vy MH Inorganic slits, micaceous 30 .................... ,,,._.......... .. c rn ` or diatomaceous fine sandy 2 `� or silty soils, elastic silts g °' OH and MH 2� Co a CH Inorganic clays of high 20 �� f E plasticity, fat clays CL env w o J 10 ,.,. Organic clays of medium to OH high plasticity, organic silts ML and OL 0 0 10 20 30 40 50 60 70 80 90 100 o N rn Pt Peat and other highly E 2) w = O organic soils LIQUID LIMIT PLASTICITY CHART UNIFIED SOIL CLASSIFICATION SYSTEM PLATE A.19 SWELL TEST RESULTS GEOTECHNICAL ENGINEERING REPORT PROPOSED BMSC /NATERRA FACILITY COPPELL, TEXAS RONE PROJECT NO. 13 -18166 Plate A.20 Liquid is Plasticity Initial .! Boring Limit Limit Index MC (%) % M -1 S-2 1.5-3 89 30 59 32 33 270 .9 - - 3-4.5 29 55 28 31 450 3.7 -3 -1 0-1.5 78 27 51 29 31 90 2.0 - 4 S-4 4.5-6 . -5 -3 3-4.5 79 28 51 27 33 450 .2 - - 5 6-7.5 79 27 52 28 31 810 2.3 - S -1 0-1.5 75 28 47 33 34 90 0. - - 6 7.5-9 77 26 51 29 30 990 0.7 - - 7 9-10 75 27 48 32 33 1140 0.4 -1 - 5 6-7.5 79 27 52 28 30 810 .1 Plate A.20 FIELD OPERATIONS Subsurface conditions were defined by 14 sample borings located as shown on the Boring Location Diagram, Plate A.3. The borings were advanced between sample intervals using continuous flight auger drilling procedures. The results of each boring are shown graphically on the Logs of Boring, Plates A.4 through A.17. Sample depth, description, and soil classification based on the Unified Soil Classification System are shown on the Logs of Boring. Keys to the symbols and terms used on the Logs of Boring are presented on Plates A.18 and A.19. Relatively undisturbed samples of cohesive soils were obtained with Shelby tube samplers in general accordance with ASTM D1587 at the locations shown on the Logs of Boring. The Shelby tube sampler consists of a thin - walled steel tube with a sharp cutting edge connected to a head equipped with a ball valve threaded for rod connection. The tube is pushed into the undisturbed soils by the hydraulic pulldown of the drilling rig. The soil specimens were extruded from the tube in the field, logged, tested for consistency with a hand penetrometer, sealed, and packaged to maintain "in situ" moisture content. The consistency of cohesive soil samples was evaluated in the field using a calibrated hand penetrometer. In this test a 0.25 -inch diameter piston is pushed into the undisturbed sample at a constant rate to a depth of 0.25 -inch. The results of these tests are tabulated at respective sample depths on the logs. When the capacity of the penetrometer is exceeded, the value is tabulated as 4.5 +. Samples of the shale were obtained using split - barrel sampling procedures in general accordance with ASTM D1586. In the split - barrel procedure, a disturbed sample is obtained in a standard 2 inch OD split barrel- sampling spoon driven into 18 inches into the ground using a 140 -pound hammer falling freely 30 inches. The number of blows for the last 12 inches of a standard 18 -inch penetration is recorded as the Standard Penetration Test resistance (N- value). The N- values are recorded on the boring logs at the depth of sampling. The samples were sealed and returned to our laboratory for further examination and testing. B -1 The shale encountered was also evaluated with a modified version of the Texas Cone Penetration test. Texas Department of Transportation (TX -DOT) Test Method Tex-1 32-E specifies driving a 3- inch diameter cone with a 170 -pound hammer freely falling 24 inches. This results in 340 foot - pounds of energy for each blow. This method was modified by utilizing a 140 -pound hammer freely falling 30 inches. This results in 350 foot - pounds of energy for each hammer blow. In relatively soft materials, the penetrometer cone is driven 1 foot and the number of blows required for each 6 -inch penetration is tabulated at respected test depths, as blows per 6 inches on the log. In hard materials (rock or rock - like), the penetrometer cone is driven with the resulting penetrations, in inches, recorded for the first and second 50 blows, a total of 100 blows. The penetration for the total 100 blows is recorded at the respective testing depths on the boring logs. Groundwater observations during and after completion of the boring are shown on the upper right of the boring log. Upon completion of the boring, the boreholes were backhlled from the top and plugged at the surface. B -1 LABORATORY TESTING General Laboratory tests were performed to define pertinent engineering characteristics of the soils encountered. The laboratory tests included moisture content, gradation (percentage of material passing through a standard U.S. No. 200 sieve), Atterberg limits determination unconfined compression, dry unit weight, free swell and visual classification. Classification Tests Classification of soils was verified by natural moisture content and Atterberg limits determinations. These tests were performed in general accordance with American Society for Testing and Materials (ASTM) procedures. The Atterberg limits, gradations and natural moisture content determinations are presented at the respective sample depths on the Logs of Boring. Strength Tests Unconfined compression tests were performed on selected samples of cohesive soils. In the unconfined compression test, a cylindrical specimen is subjected to axial load at a constant rate of strain until failure occurs. Test procedures were in general accordance with ASTM D2166. Strengths determined by this test are tabulated at their respective sample depths on the logs of borings. Results of natural moisture content and dry unit weight determinations are also tabulated at the respective sample depths on the logs. Free Swell Tests Selected samples of the near - surface cohesive soils were subjected to free swell tests. In the free swell test, a sample is placed in a consolidometer and subjected to the estimated overburden pressure. The sample is then inundated with water and allowed to swell. Moisture contents are determined both before and after completion of the test. Test results are recorded as the percent swell, with initial and final moisture content B -2 WATER PRESSURE INJECTION Purpose The purpose of these recommendations is to obtain a relatively uniform, moist, stable zone of soil beneath the proposed structure. Due to the wide variation in quality of injection subcontractors, water pressure injection is not recommended as a stabilization technique unless a full -time laboratory inspector of Rone Engineering Services, Ltd. is retained. Material 1. Water shall be potable. 2. A nonionic surfactant (wetting agent) should be used according to manufacturer's recommendations. Submission 1. Provide injection work after the subgrade has been under cut to the desired depths and prior to fill placement, installation of underground utilities and pavement. 2. Injection vehicle should have injection pipes spaced on 5 -foot center, and each injection pipe should be capable of exerting a minimum penetration force of 10,000 psi. Force injection pipe into the soil; do not wash down by scouring action of fluid. Furnish track - mounted injection vehicle in order to traverse the ground under its own power, or if rubber tire- mounted vehicle is used, provide a track - mounted machine where necessary to pull injection vehicle through mud. 3. Continue injection of fluid until refusal at all probes (i.e., until soil will not take any more and fluid is running freely on the surface, either out of previous injection holes or has fractured the ground in several places around refusal. If this occurs around any probe, cut this probe off so that water can be properly injected through the remaining probes until refusal occurs for all probes). 4. Injection pipes should penetrate the soil in approximately 12 -inch intervals, injecting to refusal at each interval to the required depth. 5. Lower portion of injection pipe should consist of a hole pattern that will uniformly disperse fluid throughout the entire depth. Injection vehicle should be fitted with individual cutoff valves for each probe. At each 12 -inch interval, each valve should be cut off and on to assure that each probe is not blocked and that injection fluid is flowing. B -3 If one or two probes are blocked, cut the others off so that the added pressure will clear out the blockage. 6. Do not exceed five feet on center each way for injection spacing. Each consecutive injection should be five feet in center and spaced 2 -1/2 feet offset in two orthogonal directions from the previous injection. 7. Adjust injection pressures to inject the greatest quantity of fluid possible within a pressure range of 50 - 100 psi. In order to assure that pressure is within this specified range, equip each injection vehicle with an accurate pressure gauge attached to the manifold (the pipes fitting on which the probe valves are attached). 8. Extend injection five feet outside the perimeter of the structure. 9. At a minimum, three water injection passes should be performed prior to testing. 10. The swell potential, moisture content, and other soil properties will be evaluated to determine acceptance of injected areas. The test results should be used to determine if additional water injections are required. 11. Repeat injections with water and surfactant five feet on center. Each consecutive water and surfactant injection should extend the required depth, injected as described above. r 12. A minimum of 24 hours should elapse between each injection application in any one area to allow for moisture absorption. 13. Upon completion of the final pressure injection, scarify the upper six inches of the surface soil and re- compact to 92 to 96 percent of the maximum dry density at a workable moisture content at least 4 percentage points above the optimum value. Observation and Testing 1. A full -time laboratory technician should be present throughout the injection operations. Undisturbed samples should be taken at one -foot intervals to the total depth injected from one test hole per 5,000 square feet of injected area, or a minimum of two test holes for injected areas less than 5,000 square feet. Adjustments in the testing program should be at the discretion of the testing engineer. 2. A minimum of three free swell tests should be performed per test hole. Samples will be tested at the approximate overburden pressure of the sample depth. The water pressure injections can be terminated when the results of the free swell tests B -3 extrapolated over the required depth indicate that post- construction movement in the injected zone will be limited to 1 inch or less, with no individual swell greater than 2 percent. B -3 Reportabl@ 0 0 Quantities 14MsT-7jT"=M-1WM- M7019= Sec. 110.1 Definitions. 110.2 Applicability. 110.3 Discharge of oil in such quantities as "may be harmful- pursuant to section 311(b)(4) of the Act. 110.4 Dispersants. 110.5 Discharges of oil not determined "as may be harmful" pursuant to section 311 (b) (3) of the Act. 110.6 Notice. AUTHORITY: 33 U.S.C. 1321(b)(3) and (b)(4) and 1361(a): E.O. 11735, 38 FIR 21243, 3 CFR Parts 1971-1975 Comp.. p. 793. SOURCE: 52 FIR 10719, Apr. 2, 1987, unless otherwise noted. 4110.1 Definitions. § 109.6 Coordination. For the purposes of coordination, the contingency plans of State and local governments should be developed and It �-112 that are subject to the ebb and flow of the tide; (b) Interstate waters, including inter- state wetlands; (c) All other waters such as intra- state lakes, rivers, streams (including intermittent streams), mudflats, sandflats, and wetlands, the use, deg- radation, or destruction of which would affect or could affect interstate or for- eign commerce including any such wa- ters: (1) That are or could be used by inter- state or foreign travelers for rec- reational or other purposes; (2) From which fish or shellfish are or could be taken and sold in interstate or foreign commerce; (3) That are used or could be used for industrial purposes by industries in interstate commerce: (d) All impoundments of waters oth- erwise defined as navigable waters under this section; (e) Tributaries of waters identified in paragraphs (a) through (d) of this sec- tion, including adjacent wetlands; and (f) Wetlands adjacent to waters iden- tified in paragraphs (a) through (e) of this section: Provided, That waste treatment systems (other than cooling ponds meeting the criteria of this para- graph) are not waters of the United States; Navigable waters 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 au- thority regarding Clean Water Act ju- risdiction remains with EPA. NPDES means National Pollutant Discharge Elimination System; Sheen means an iridescent appear- ance on the surface of water; Sludge means an aggregate of oil or oil and other matter of any kind in any form other than dredged spoil having a combined specific gravity equivalent to or greater than water; United States means the States, the District of Columbia, the Common- wealth of Puerto Rico, Guam, Amer- ican Samoa, the Virgin Islands, and the Trust Territory of the Pacific Islands; Wetlands means those areas that are inundated or saturated by surface or ground water at a frequency or dura- 18 E11][011 X41111PAITIM-H tion sufficient to support, and that under normal circumstances do sup- port, a prevalence of vegetation typi- cally adapted for life in saturated soil conditions. Wetlands generally include playa lakes, swamps, marshes, bogs and similar areas such as sloughs, prai- rie potholes, wet meadows, prairie river overflows, mudflats, and natural ponds. 152 FR 10719, Apr. 2. 1987. as amended at 58 FR 45039, Aug. 25, 1993; 61 FR 7421, Feb. 28, 1996] §110.2 Applicability. The regulations of this part apply to the discharge of oil prohibited by sec- tion 311(b) (3) of the Act. [61 FR 7421, Feb. 28, 1996] § 110.3 Discharge of oil in such quan- tities as "may be harmful" pursuant to section 311(b)(4) of the Act. For purposes of section 311(b) (4) of the Act, discharges of oil In such quan- tities that the Administrator has de- termined may be harmful to the public health or welfare or the environment of the United States include discharges of oil that: (a) Violate applicable water quality standards; or (b) Cause a film or sheen upon or dis- coloration of the surface of the water or adjoining shorelines or cause a sludge or emulsion to be deposited be- neath the surface of the water or upon adjoining shorelines. 161 FR 7421, Feb. 28, 19961 §110.4 Dispersants. Addition of dispersants or emulsifiers to oil to be discharged that would cir- cumvent the provisions of this part is prohibited. 152 FR 10719, Apr. 2, 1987. Redesignated at 61 FR 7421, Feb. 28, 19961 §110.5 Discharges of oil not deter- mined "as may be harmful" pursu- ant to Section 311 (b) (3) of the Act. Notwithstanding any other provi- sions of this part, the Administrator has not determined the following dis- charges of oil "as may be harmful" for purposes of section 311(b) of the Act: (a) Discharges of oil from a properly functioning vessel engine (including an engine on a public vessel) and any dis- charges of such oil accumulated in the bilges of a vessel discharged in compli- ance with MARPOL 73178, Annex I, as provided in 33 CFR part 151, subpart A; (b) Other discharges of oil permitted under MARPOL 73/78, Annex 1, as pro- vided in 33 CFR part 151, subpart A; and (c) Any discharge of oil explicitly permitted by the Administrator in con- nection with research, demonstration projects, or studies relating to the pre- vention, control, or abatement of oil pollution. [61 FR 7421, Feb. 28, 19961 Any person in charge of a vessel or of an onshore or offshore facility shall, as soon as he or she has knowledge of any discharge of oil from such vessel or fa- cility in violation of section 311(b)(3) of the Act, immediately notify the Na- tional Response Center (NRC) (800 -424- 8802; in the Washington, DC metropoli- tan area, 202-426-2675). If direct report- ing to the NRC is not practicable, re- ports may be made to the Coast Guard or EPA predesignated On-Scene Coordi- nator (OSC) for the geographic area where the discharge occurs. All such reports shall be promptly relayed to the NRC. If it is not possible to notify the NRC or the preclesignated OCS im- mediately, reports may be made imme- diately to the nearest Coast Guard unit, provided that the person in charge of the vessel or onshore or off- shore facility notifies the NRC as soon as possible. The reports shall be made in accordance with such procedures as the Secretary of Transportation may prescribe. The procedures for such no- tice are set forth in U.S. Coast Guard regulations, 33 CFR part 153, subpart B and In the National Oil and Hazardous Substances Pollution Contingency Plan, 40 CFR part 300, subpart E. (Approved by the Office of Management and Budget under control number 2050-0046) [52 FIR 10719, Apr. 2, 1987. Redesignated and amended at 61 FR 7421, Feb. 28, 1996; 61 FR 14032, Mar. 29, 19961 19 I[*] k, � 611-= Subpart A—Applicability, Definitions, and General Requirements For All Facilities and All Types of Oils 112.1 General applicability. 112.2 Definitions. 112.3 Requirement to prepare and imple- ment a Spill Prevention, Control, and Countermeasure Plan. 112.4 Amendment of Spill Prevention, Con- trol, and Countermeasure Plan by Re- gional Administrator. 112.5 Amendment of Spill Prevention, Con- trol, and Countermeasure Plan by owners or operators. 112.6 [Reservedl 112.7 General requirements for Spill Preven- tion, Control, and Countermeasure Plans. •0 • • • 112.8 Spill Prevention, Control, and Coun- termeasure Plan requirements for on- shore facilities (excluding production fa- cilities). 112.9 Spill Prevention. Control, and Coun- termeasure Plan requirements for on- shore oil production facilities. 112.10 Spill Prevention. Control, and Coun, termeasure Plan requirements for on, shore oil drilling and workover facilities. 112.11 Spill Prevention, Control, and Coum termeasure Plan requirements for of shore oil drilling, production, or workover facilities. Subpart C—Requirements for Animal Fats and Oils and Greases, and Fish and Marine Mammal Oils; and for Vege- table Oils, Including Oils from Seeds, Nuts, Fruits and Kernels 112.12 Spill Prevention, Control, and Coun- termeasure Plan requirements for on- shore facilities (excluding production fa- cilities). 112.13 Spill Prevention, Control, and Coun- termeasure Plan requirements for on- shore oil production facilities. 112.14 Spill Prevention, Control, and Coon termeasure Plan requirements for on- shore oil drilling and workover facilities. F.WFIN potentially responsible parties to undertake response actions. (e) Because state and local public safety organizations would normally be the first government representatives at the scene of a discharge or release, they are expected to initiate public safety measures that are nec- essary to protect the public health and wel- fare and that are consistent with contain- ment and cleanup requirements in the NCP, and are responsible for directing evacuations pursuant to existing state or local proce- dures. [59 FR 47473, Sept. 15, 19941 0 • Sec. 302.1 Applicability. 302.2 Abbreviations. 302.3 Definitions. 302.4 Designation or hazardous substances. 302.5 Determination of reportable quan- tities. 302.6 Notification requirements. 302.7 Penalties. 302.8 Continuous releases. AUTHORrry: 42 U.S.C. 9602. 9603, and 9604: 33 U.S.C. 1321 and 1361. SOURCE: 50 FIR 13474, Apr. 4, 1985, unless otherwise noted, § 302.1 Applicability. § 302.3 Definitions. Vl�'! )I CASRN= Chemlcal Abstracts Service Reg- istry Number RCRA=Resource Conservation and Recovery Act of 1976, as amended lb=pound kg=kilograrn RQ=reportable quantity will I fMM*Tli I =I- a r-1 I M. M- = M 281 §302.4 I GSA ua 21 40 CFR Ch!. 1 (7-1-99 EdIfton) ...... aim p1gey a CY. . ................ . .......... . . fli ............. . <wQ b<int3< x M . ..................... . . .. . .. ....... . ........... . ...... . ... ... ... ;-,; . ....................... . . . ...... - - - — -- — ---------------- ----------------------------------- - - - - Vic, olanq! 101 ,pop youllL "Wip ti . ............................ ... . ....... . . INTO 1 11 1 i z i i 1 i j 11 1 11 3, -s 51, 1 ANA old AN 1 p", i P, 1 . . . ... . . . . . . ............................... ws lag H qY H 0 1, HMO 1M 111111111111 it $I}{ , i y;,, �,-P; i, i via' �g IMM IMM Continued I Thulium -162 Thu ju�166 ............ Thulium-167 Thulium-170 .............. Thulium -171 Thulium -172 Tlm-173 ............. Thu Thulium -175 Tin -110 ..................... Tin -111 ..................... Tin -113 ........... Tin -117m Tin-1 1 9m ........... Tin-121m Tin-121 .............. Mn-123m .......... Tin-123 .................... Tin-125 ..................... Tin-126 ..................... Tin-127 . ................... Tin-128 ..................... TltaniumA4 ............... Titanium-45 Tungsten-176 Tungsten-177 ........... Tungsten-178 - Tungsten-179 - Tungsten-181 ........... Tungsten-185 ---- Tungsten-187 ........... Tungsten-188 ........... Uraniur n-230 Uranium-231 ............. Uranium -23 2 Uranlun 233 Uranium-234* .......... Uranium-2350 Uranlum-236 Uranlum-237 Uranium-2380 Uranium-239 Uranlum-240 Vanadium-47 ............ Vanadium-48 Vanadium-4g Xenon-120 ................ Xenon-121 ................ Xenon -122 ................ Xenon -123 ................ Xenon -125 ................ Xenon-127 - Xenon -129m Xenon -131m Xenon -133m Xenon -133 Xenon-135m Xenon-135 Xenon -138 Ytterbium -162 Ytterbium-166 ........... Ynerblum-167 ........... Ytterbium-169 Yttwbiur 175 Ytterbium -177 Ytlerbium-178 Yttrium-86m Yttrium -86 Yttrium -87 Yttrium -88 ........... Yttrium-90m .... --- 1000 (3.7E 13) 10 (3.7E 11) 100 (3.7E 12) 10 (3.7E 11) 100 (3.7E 12) 100 (3.7E 12) 100 (3.7E 12) 1000 (3.7E 13) 100 (3.7E 12) 1000 (3.7E 13) 10 (3.7E 11) 100 (3.7E 12) 10 (3.7E 11) 10 (3.7E 11) 1000 (3.7E 13) 1000 (3.7E 13) 10 (3.7E 11) 10 (VE 11) I (VE 10) 100 (3.7E 12) 1000 (3.7E 13) 1 (3.7E 10) 1000 (3.7E 13) 1000 (3.7E 13) 100 (3.7E 12) 100 (3.7E 12) 1000 (3.7E 13) 100 (3.7E 12) 10 (VE 11) 100 (3.7E 12) 10 (3.7E 11) I (3.7E 10) 1000 (3.7E 13) 0.01 (3.7E 8) 0.1 (VE 9) 01 (3.7E 9) 0.1 (3.7E 9) 0.1 (VE 9) 100 (3.7E 12) 0.1& (VE 9) 1000 (3.7E 13) 1000 (3.7E 13) 1000 (3.7E 13) 10 (VE 11) 1000 (VE 13) 100 (3.7E 12) 10 (3.7E 11) 100 (3.7E 12) 10 (3.7E 11) 100 (3.7E 12) 100 (3.7E 12) 1000 (3.7E 13) 1000 (3.7E 13) 1000 (3.7E 13) 1000 (3.7E 13) 10 (3.7E 11) 100 (3.7E 12) 10 (17E 11) 1000 (VE 13) 10 (3.7E 11) 1000 (3.7E 13) 10 (3.7E 11) 100 (3.7E 12) 1000 (3.7E 13) 1000 (3.7E 13) 1000 (3.7E 13) 10 (3.7E 11) 10 (3.7E 11) 10 (3.7E 11) 100 (3.7E 12) § 302.5 APPENDIX B TO § 302.4-RADIONUCLIDES- Continued KM Waste Constituent Max ppm K169 Benzene .................. .......................... 220.0 K170 Benzene ............. ............................... 1.2 Benzo (a) pyrone ............................... 230.0 Manx (a,h) anthracene .................... 49-0 Benzo (a) anthrecone ........................ 390.0 Benzo (b) fluoranthene ...................... 110.0 Benzo (k) fluoranthene ................. 110.0 3-Methyleholenthrone ...................... 27.0 7,12-Dimethylbenz (a) anthrocene 1,200.0 K171 Benzene ............. ............................... 500.0 Arsenic ..................................... 1,600.0 K172 Benzene ....................................... 100.0 Arsenic ............................................ 730.0 up unknown), the only such releases sub- ject to this section's notification re- quirements are those in which the total quantity (in curies) released is equal to or greater than either one curie or the lowest RQ of any known individual radionuclide in the mixture or solution, whichever is lower. (c) The following categories of re- leases are exempt from the notification requirements of this section: (1) Releases of those radionuclides that occur naturally in the soil from land holdings such as parks, golf courses, or other large tracts of land. (2) Releases of naturally occurring radionuclides from land disturbance activities, including farming, construc- tion, and land disturbance incidental to extraction during mining activities, except that which occurs at uranium, phosphate, tin, zircon, hafnium, vana- dium, monazite, and rare earth mines. Land disturbance incidental to extrac- tion includes: land clearing: overbur- den removal and stockpiling; exca- vating, handling, transporting, and storing ores and other raw (not beneficiated or processed) materials; and replacing in mined-out areas coal ash, earthen materials from farming or construction, or overburden or other raw materials generated from the ex- empted mining activities. (3) Releases of radionuclides from the dumping and transportation of coal and coal ash (including fly ash, bottom ash, and boiler slags), including the dumping and land spreading operations that occur during coal ash uses. (4) Releases of radionuclides from piles of coal and coal ash, including fly ash, bottom ash, and boiler slags. (d) Except for releases of radio- nuclides, notification of the release of an RQ of solid particles of antimony, arsenic, beryllium, cadmium, chro- mium, copper, lead, nickel, selenium, silver, thallium, or zinc is not required if the mean diameter of the particles released is larger than 100 micrometers (0.004 inches). [50 FR 13474, Apr. 4. 1985, as amended at 54 FR 22538, May 24, 1989; 54 FR 33481, Aug. 14, 1989; 63 FR 13475, Mar. 19, 1998; 63 FR 42189, Aug. 6, 1998; 64 FR 13114, Mar. 17, 19991 § 302.7 Penalties. (a) Any person— (1) In charge of a vessel from which a hazardous substance is released, other than a federally permitted release, into or upon the navigable waters of the United States, adjoining shorelines, or into or upon the waters of the contig- uous zone, (2) In charge of a vessel from which a hazardous substance is released, other than a federally permitted release, which may affect natural resources be- longing to, appertaining to, or under the exclusive management authority of the United States (including resources under the Fishery Conservation and Management Act of 1976), and who is otherwise subject to the jurisdiction of the United States at the time of the re- lease, or (3) In charge of a facility from which a hazardous substance is released, other than a federally permitted re- lease, in a quantity equal to or greater than that reportable quantity deter- mined under this part who fails to no- tify immediately the National Re- sponse Center as soon as he has knowl- edge of such release shall be subject to all of the sanctions, including criminal penalties, set forth in section 103 of the Act with respect to such failure to no- tify. (b) Notification received pursuant to this section or information obtained by the exploitation of such notification shall not be used against any such per- son in any criminal case, except a pros- ecution for perjury or for giving a false statement. (c) This section shall not apply to the application of a pesticide product reg- istered under the Federal Insecticide. Fungicide, and Rodenticide Act or to the handling and storage of such a pes- ticide product by an agricultural pro- ducer. § 302.8 Continuous releases. (a) Except as provided in paragraph (c) of this section, no notification is re- quired for any release of a hazardous substance that Is, pursuant to the defi- nitions in paragraph (b) of this section, continuous and stable in quantity and rate. (b) Definitions. The following defini- tions apply to notification of contin- uous releases: M Continuous. A continuous release is a release that occurs without interrup- tion or abatement or that is routine, anticipated, and intermittent and inci- dental to normal operations or treat- ment processes. Normal range. The normal range of a release is all releases (in pounds or kilograms) of a hazardous substance re- ported or occurring over any 24-hour period under normal operating condi- tions during the preceding year. Only releases that are both continuous and stable in quantity and rate may be in- cluded in the normal range. Routine. A routine release is a release that occurs during normal operating procedures or processes. Stable in quantity and rate. A release that is stable in quantity and rate is a release that is predictable and regular in amount and rate of emission. Statistically significant increase. A sta- tistically significant increase in a re- lease Is an Increase In the quantity of the hazardous substance released above the upper bound of the reported normal range of the release. (c) Notification. The following notifi- cations shall be given for any release qualifying for reduced reporting under this section: (1) Initial telephone notification: (2) Initial written notification within 30 days of the initial telephone notifi- cation; (3) Follow-up notification within 30 days of the first anniversary date of the initial written notification; (4) Notification of a change In the composition or source(s) of the release or in the other information submitted in the initial written notification of the release under paragraph (c) (2) of this section or the follow-up notifica- tion under paragraph (c) (3) of this sec- tion; and (5) Notification at such times as an increase in the quantity of the haz- ardous substance being released during any 24-hour period represents a statis- tically significant increase as defined In paragraph (b) of this section. (d) Initial telephone notification. Prior to making an initial telephone notifi- cation of a continuous release, the per- son in charge of a facility or vessel must establish a sound basis for quali- fying the release for reporting under CERCLA section 103(f)(2) by: (1) Using release data, engineering es- timates, knowledge of operating proce- dures, or best professional judgment to establish the continuity and stability of the release; (2) Reporting the release to the Na- tional Response Center for a period suf- ficient to establish the continuity and stability of the release; or (3) When a person in charge of the fa- cility or vessel believes that a basis has been established to qualify the release for reduced reporting under this sec- tion, initial notification to the Na- tional Response Center shall be made by telephone. The person in charge must identify the notification as an initial continuous release notification report and provide the following infor- mation: (I) The name and location of the fa- cility or vessel; and (ii) The name(s) and identity(les) of the hazardous substance(s) being re- leased. (e) Initial written notification. Initial written notification of a continuous re- lease shall be made to the appropriate EPA Regional Office for the geo- graphical area where the releasing fa- cility or vessel is located, (Note: In ad- dition to the requirements of this part, releases of CERCLA hazardous sub- stances are also subject to the provi- sions of SARA title III section 304, and EPA's Implementing regulations codi- fied at 40 CFR part 355, which require initial telephone and written notifica- tions of continuous releases to be sub- mitted to the appropriate State emer- gency response commission and local emergency planning committee.) (1) Initial written notification to the appropriate EPA Regional Office shall occur within 30 days of the initial tele- phone notification to the National Re- sponse Center, and shall include, for each release for which reduced report- ing as a continuous release is claimed, the following information: (I) The name of the facility or vessel: the location, including the latitude and longitude; the case number assigned by the National Response Center or the Environmental Protection Agency-, the Off Dun and Bradstreet number of the fa- cility, if available; the port of registra- tion of the vessel: the name and tele- phone number of the person in charge of the facility or vessel. (ii) The population density within a one-mile radius of the facility or ves- sel, described In terms of the following ranges: 0-50 persons, 51-100 persons, 101-500 persons, 501-1,000 persons, more than 1,000 persons. (III) The identity and location of sen- sitive populations and ecosystems within a one-mile radius of the facility or vessel (e.g.. elementary schools, hos- pitals, retirement communities, or wetlands). (Iv) For each hazardous substance re- lease claimed to qualify for reporting under CERCLA section 103(f)(2), the fol- lowing information must be supplied: (A) The name/identity of the haz- ardous substance; the Chemical Ab- stracts Service Registry Number for the substance (if available); and if the substance being released is a mixture, the components of the mixture and their approximate concentrations and quantities, by weight. (B) The upper and lower bounds of the normal range of the release (in pounds or kilograms) over the previous year. (C) The source(s) of the release (e.g:, valves, pump seals, storage tank vents, stacks). If the release is from a stack, the stack height (in feet or meters). (D) The frequency of the release and the fraction of the release from each release source and the specific period over which It occurs. (E) A brief statement describing the basis for stating that the release is continuous and stable in quantity and rate. (F) An estimate of the total annual amount that was released in the pre- vious year (in pounds or kilograms). (G) The environmental medium(a) af- fected by the release: (1) If surface water, the name of the surface water body; (4 If a stream, the stream order or average flowrate (in cubic feet/second) and designated use; (J) If a lake, the surface area (in acres) and average depth (in feet or me- ters); (4) If on or under ground, the location of public water supply wells within two miles. (H) A signed statement that the haz- ardous substance release(s) described is(are) continuous and stable in quan- tity and rate under the definitions in paragraph (a) of this section and that all reported information is accurate and current to the best knowledge of the person in charge. (f) Follow-up notification. Within 30 days of the first anniversary date of the initial written notification, the person in charge of the facility or ves- sel shall evaluate each hazardous sub- stance release reported to verify and update the information submitted In the initial written notification. The follow-up notification shall include the following information: (1) The name of the facility or vessel; the location, including the latitude and longitude; the case number assigned by the National Response Center or the Environmental Protection Agency; the Dun and Bradstreet number of the fa- cility, if available; the port of registra- tion of the vessel; the name and tele- phone number of the person in charge of the facility or vessel. (2) The population density within a one-mile radius of the facility or ves- sel, described in terms of the following ranges: 0-50 persons, 51-100 persons, 101-500 persons, 501-1,000 persons, more than 1,000 persons. (3) The identity and location of sen- sitive populations and ecosystems within a one-mile radius of the facility or vessel (e.g., elementary schools, hos- pitals, retirement communities, or wetlands) . (4) For each hazardous substance re- lease claimed to qualify for reporting under CERCLA section 103(f)(2), the fol- lowing information shall be supplied: (I) The name /identity of the haz- ardous substance; the Chemical Ab- stracts Service Registry Number for the substance (if available); and if the substance being released is a mixture, the components of the mixture and their approximate concentrations and quantities, by weight. (!I) The upper and lower bounds of the normal range of the release (in pounds or kilograms) over the previous year. 351 (111) The source(s) of the release (e.g., valves, pump seals, storage tank vents, stacks). If the release is from a stack, the stack height (in feet or meters). (iv) The frequency of the release and the fraction of the release from each release source and the specific period over which it occurs. (v) A brief statement describing the basis for stating that the release is continuous and stable in quantity and rate. (vi) An estimate of the total annual amount that was released in the pre- vious year (in pounds or kilograms). (vil) The environmental medlum(a) affected by the release: (A) If surface water, the name of the surface water body; (B) If a stream, the stream order or average flowrate (in cubic feet/second) and designated use; (C) If a lake, the surface area (in acres) and average depth (in feet or me- ters) ; (D) If on or under ground, the loca- tion of public water supply wells with- in two miles. (viii) A signed statement that the hazardous substance release(s) Ware) continuous and stable in quantity and rate under the definitions in paragraph (a) of this section and that all reported information is accurate and current to the best knowledge of the person in charge. (g) Notification of changes in the re- lease. If there Is a change in the re- lease, notification of the change, not otherwise reported, shall be provided in the following manner: (1) Change in source or composition. If there is any change in the composition or source(s) of the release, the release is a new release and must be qualified for reporting under this section by the submission of initial telephone notifi- cation and initial written notification in accordance with paragraphs (c) (1) and (2) of this section as soon as there is a sufficient basis for asserting that the release Is continuous and stable in quantity and rate; (2) Change in the normal range. If there is a change in the release such that the quantity of the release ex- ceeds the upper bound of the reported normal range, the release must to re- ported as a statistically significant in- crease in the release. If a change will result in a number of releases that ex- ceed the upper bound of the normal range, the person in charge of a facility or vessel may modify the normal range by: (I) Reporting at least one statis- tically significant increase report as required under paragraph (c) (7) of this section and, at the same time, inform- ing the National Response Center of the change in the normal range; and (H) Submitting, within 30 days of the telephone notification, written notifi- cation to the appropriate EPA Re- gional Office describing the new nor- mal range, the reason for the change, and the basis for stating that the re- lease in the increased amount is con- tinuous and stable in quantity and rate under the definitions in paragraph (b) of this section. (3) Changes in other reported informa- tion. If there is a change in any infor- mation submitted in the initial written notification or the followup notifica- tion other than a change in the source, composition, or quantity of the release, the person in charge of the facility or vessel shall provide written notifica- tion of the change to the EPA Region for the geographical area where the fa- cility or vessel is located, within 30 days of determining that the informa- tion submitted previously is no longer valid. Notification shall include the reason for the change, and the basis for stating that the release Is continuous and stable under the changed condi- tions. (4) Notification of changes shall in- clude the case number assigned by the National Response Center or the Envi- ronmental Protection Agency and also the signed certification statement re- quired at (c) (2) (xi) of this section. (h) Notification of a statistically signifi- cant increase in a release. Notification of a statistically significant increase in a release shall be made to the National Response Center as soon as the person in charge of the facility or vessel has knowledge of the increase. The release must be identified as a statistically significant increase in a continuous re- lease. A determination of whether an increase is a "statistically significant increase" shall be made based upon calculations or estimation procedures M, 155 FR 30185, July 24. 19901 KM Envftnmental Protection Agency § 117.3 saturated soil conditions, Wetlands #72"7,2 Abbreviations. generally included playa lakes, a marshes, bogs, and similar NFT7'FS equals National Pollutant Elin-iination are as su e7 a-, sou ghs„ prairie potholes , Discharge ysteni, RQ wet meadows„ prairie river overfows equals reportable quantity, niud'flats and natural ponds): Provided, That waste trratrrient systems tothcer §117.3 t7etea amixaatlxari of reportable than cooling ponds meeting the a:ri- quantities,. quantities,. teria of this paragraph) are not waters Each substance in Table 117.3 that is tai'' the United States. listed in Table 302,.4, +40 CFR part 302, is Navigable waters do not include prior assigned the reportable quantity listed converted cropland, l" Jotwitlastanding in Table 302.4 for that substance. the determination of an area's status as prior, converted Cropland by any TABLE 1173.... RlrPOR ABLA' QUAl^d1" "l'i'l.T s other federal agency, for the purposes OF" HAZARDOUS uBs'rANCIFs DFs- of the Clean Water Ac C the final au- 1C;IVM ED PURSUANT' TO SEUION 311 ter thority regarding Clean Water Act fu- THE CL,E:Ai^i WA"l E ,R ACT risdic-ti'on remains with EPA. Q) Process waste wearer means any CvCaTt. 71we # "9'r °st rrureatrer° order the column R water which, during manufaarLuring or headed Q is the reportable quantity in,: pounds The number In parentheses is the processing, comes into direct eontac:tt metric equivalent in kilograms. For eonven- with or results from the production or fence, the 'table contains a column headed . use of any raw material, intermediate "Category" wtac i lusts the rode letters X'. product. finished product, byproduct, A, W "'T"" and "D" associated with re . or waste product. portable quantities of t. lo. too, 1000, and 5000 X44 F "R 50776 Aug 25, 1519, as amended at 58 pounds, respectively, FR 45029, Aug. 25, 19,931 TAKE 1' 17.3 -- REPORTABLE QUANTITIES OF HAZARDOUS SUBSTANCES 17ES1GNA7"Eo PURSUANT TO SECTION 311 OF THE CLEAN WATER ACT _..,. w. w,.,,.,,,.,.. ...................-,,.,....,.,,,..,,,, „..,,,,,,_�_......____...._�.. MatiSieedatl ....... Category RU in rxourids GKftg'ramsw .............. .. .. .............. AGdyrA�6pakbyd'k7 . .... ........ .. mm G;.. .....,,_.. 1,01)0 (4541 Arctica;nhydrde ,....,.,..,. ............ ..... .._.. ......... .................. ..........,.,.,...,., o .. .......... MW (227Q AcMorry gawnotvVdhn ............. ....... .... ..... A . .............. 10 (4.-A) AcetyO bromide ........ ........_.... , ., ..........,., ..,.,.....,....... .. , ........... ❑.... ., ... 5,000 (2,27Q AceW Wm de ... ......... ...... ........ . ..._.,...... .., ,,..,,.... ...,........ ....,.. (tY 5.000 (2,27Q AwrOsiro........... .............. .. .. ............. .. ... ......,.. ,.. , ,.,..,. , ., X .. ........ 1 ldl454:1 Acryloxvtrita ............. 8 100 (45A) ) Adipi,c and ,, ,,,,,,,,,, ,, ,...,.,., .... ... _. _.. "CJ'... ,......,.. 1,1,11N,;2.271, Alavlru ............ ...._.... ..,......,.... .. .... ..,....., . 7C ........... 1(0,4!4} AIly9 a@cohoV ...... ....... ...... ........... ............, ,..,,,, ...,,.., ., ,...,,.., ......... S ...... ,., ..., 100 (45 4) adlyi Chdigrtid .. ...... .. c . ... .......... 1,U00 (454i Alrumrrrruim o0ata . ............ .. ............ ... ......... 1E.., , ......... s to (2,270). Ammonua .. ....,.,,” .. .... .......... ........... .. .. ........ .............. . ..... is 10D (45.4) Ammoniurn a,a We ......... ...... ....... . ............ .,.,.,.. .. „.....,... .... w"'i', ..,,,...,.., l.eti! (2.27V) AmrroN.m Lwerixoaie .,., ...................... ..... C,... ........ 5,:Q,M (2,270,) Amrrvorwrn aalcartaannaia ...._ .- ....,. ............ . .......... C.... .... ,.... ...... ........ 5.000 (2,2701, Ammonium Lricrrronale .. ............ ............. .._...,.. .,,...,...... ,,,....... A 10 (4 54) Arnmorliim Lritl,uord'.a .... . .......... ............ .. _.... ....,_. .,.. ,.., ,..., ..,....,, H ......., 900(4,5,4) Ammaxnlum taiaul4Ve .,..... .............................. _ ,._....... ....,.,.,, ...._.. C' .. ....... s,oairi (2,270) Ammalrtiun�i c3arYya�car�ate ... .. �� ..... ....... . �.....,,.. . ,.......,. , ,... G' .,,...._,. 5.1,, C00 1'2.170) Arr,rrO uam OVIVf IO ... .................... .. .......... .,...... Gr . ....,....... 5,00)5 12,270'} Ammonium chiotide _._. ........ . .......... . ...... ..... ... .. .... .... C , .....,.,_. l,0ti741 )2,1701 Ara"mracarorurrr cldfemota ....... . ...... ............................... ... .... �. ........ .......�. A ............. 10(4.K Ammonium ,.!hate ddbaaalc , ...... C . ....... 95,000 42,1770) Ammonium Ipwborale .., .... .... ... ..- .......... ... r'.. .......... Mao (2,270), Ammonoum flu pride . ....... - ............ . ........ ,,,.. 100 £45..41 Ammorrum hyd'amide ...... .... ... ...... ....... ..,..... , ......, ,...,... C ......,..... 1,DOO (454), Ammcnlum 001010 ............. .......... ... .......... „......... ..._., .. G . ._..,.. 6,000 (2,270) Amme,=m aildc4Cdanw da .............. ... .. ......... ... ....... .. .................... C .........., 7,f)JXp (454) ArmvnWro sutfwn a .... ...................... ...... . ..... ............ . ...... CM .. ..,_.... 5,000 (2 270) Amrncnaum aalFrde ........ ............ ,......_._ ..... .. ........ ..,,,.,.., ,,..,. Ed .... .... 100(45.4) Animomin'i suiVFka � ........... ........... .. ,...., ,.......,...,,..., ................�� C U00 (2270) Am -cnum larlraie ............ ........... ............. .... - C .. ........, 5,000 (2,27'0) Ammrin unm IabaxVanalk5 . ....... , „ ,.... .... -, ......... ..... t' .. ......,.,.... :a.ibY O 12,270) 711 117.3 40 CFR, Ch. 11, (7-1�-99 Edfion) TABLE 117.3—REPORTABLE QUANTITIES OF HAzARDous SUBSTANCES DESIGNATED PURSUANT TO SErnoN 311 OF THE CLEAN WATER AcT--Conlinued . ..... . ......... . ...... ............. . ......... . ...................................... . - Ca-je--Y ------ ------------------------------------- gC)r matesial Ra in pa rids (KOograms� Amyl Acetate 0 5 000 (2.270) AnWne, ... .... .. . ....... ..... ........ .......... D 5 Doo (2.270) Antmany pentachlorde . . .... .......... . .... ......... .... ... ... .... . C 1,DOO (454) Antiniony polassium tarlrala B ..... .. ...... 100 (45 4) AnWony tritmmi0v ....... ....... .... 0 . I-- - - 1,00 (454) AnUmany tMhtfido .......... ... ... . .. ... ... C 1,000 (454J AnUmmy Iffflumidie . ........ ............. .. . .. . ....... .. .............. . ............ ......... .. .... ... C 1,000 (4548 AlOnny trox,de . ..... C .. .............. 1,000(454) Munm d➢sutrite - .. ... .... .... ......... X I ((jA, 'A,) Amenc pentmoo . . ... ...... . X 1 QUA54) Amenc lm hl(xoo .. ... .... ....... ... X 1 (0.454) Arsomc Inmide .... ........... X I (CA.'A) Arswc lf1%tjfj@ 1 (0.04) Borium cyamlu ........ .... A .. ............. 10 $4 M) so"ono , .- ...... .. .... 9(544.5'4) Banzom au d . ......... .... ..... .. . ....... .... D 5.000 (2,270) ............. .....,. 000 y2,270� Sorzoyt chlrjrude C 1,000 (4 'A) bftnZY1 Q'Illy'do 100 g45,1 eoryt4UM rlh[Clddo , (O 454) Bwyhurr, guanda X 1 (11.454) BeryHwm narale . X (UA,'Ap Bulyl acm1ale .... .......... .. . . .... ... . p vo � . HMyZaMln0 ... ... . .... �uou 1110 (4f�) n-Butyl phvlWole ........... ..... -- .... ... - .......... A " " ' B.1pe and .. .. .. .... ....... . .. .. D u 6 Tv� (",'admium acolala A I U q4. 54) Cadfw,,,jm Womde ....... .... .. ..... . .. ..... ........... ..... . ......... . . .. .. A 10 (4.64 ) Crad-w ohlqrWe .. ..... . ..... . .. ...... A .. ..... ... IC 84,64) GINCWMI al"Aale ..... .... .. X 1 .1 1 (01454) en'lto X I'll -1 11 1 (01,454) C�aft.i.m 'a,bidm .. .. .......... .. ........ ...... A .... ... ......... IC (414) calcAlM A 10 (4,$49 04tmv- cyande A IQ (4.54$ Ca�jum� ... .... .. .... r, I .00,0 14545 CWOLArr, ftypocNanlo ..... ....... ... A 10 (4 54) C"Vltafl A 10 (4.849 Carbgry9 8 1&749 (4.5 -4) .. .... .... ............ ... ...................... A . ..... . aO 44,54) Carl d�$)U$do $ -- ...... 100 (45A) cod'b" WivaMondo .............. A ....... ...... .. 10 (4.54) C•bidarm X 1 (&).454) Chhoino A (4,") Cltmbanzene 8 110 00(45,4) Cb wolofm , , .-, , - ........ ....... ... A 10 (4.54) CMCWoVUffoMC" 410W C 1,0100 (4;54) Ghir)aPynfos x 1 (4,4'54) Cbrormc owlolro C 1,000(454) Cbmtr,!C ood ... ....... ..... A 10 (4,54) GhMnr, %ijIfNIo C I.B00 (454) Clwarmo OfttlOe . . ...... C . ......... I aDCO (454) Cotloftj$ 4rotftlde C 1,000 (454) Coba4aos la—sW C 1,000 Q454) oQb8k'tClW$ $Ulfa.dto ,...,. .,.... ........... ,......... ............ ........ C f,000 (454) Commaphos -- A ... .... .. . f 0 (4 54) Crvso . , r.- - -' 8 . ... ................ I K (4 5A .......... I 0() 45,45 Q,jp-c acoWe .. ....... ....................... ... ......... 100 145,4) 'Cupric acolvamonft . .... ....... ....... X 1 (0.454y Cupvc chion do A to t4,"A) CUP'r'C nVtlaje' ........ 0 100 (4540 Cupric. cxaWe .............. ... ..... ............. a 100 (4$4) Cupric sulate . ............. ... A 10 (4.54y Ctopric sullate, mmonaled " . r,r, . 8 100 (45,4y CwPTC 190fa4O ...... r ..... ....... a I lrxl 04) Cyanag" cNordO A 10 (4-64p cydallexane .......... ....... . .. ..... C 1,000 d454�i 2,4-D ACA ....... .... ..... ... ... ...... ....... ................... ..... ...... .. ..... .... B 100 &45A) 2,4-D ... .. ... ..... ............ 8 .......... .. .... 100 44541 DDT X 1.1--1 1-1. 1 1 (41.454') azzinon ......... .... .... .. X - - . ..., - 1 (C,454) En,vironmenial Protection Agency §117.3 TALE 11 73—REPORtABLE QUANTITIES of H' ARDOUS SUBSTANCES OEVGNATED PURSUANT TO SECTION 311 Of THE CLEAN WATER ACT—Continued Ma toral Category RQ m pounds 9KiKQrarns) DIG"JI"ba ,, , ,, r . . .............. ..... ... .. ..... C - .- � ., 1,000 Q454d . ..... 0:h�obeni .. . .. ... ........... .............. ........ e . .. ............ - IOU (45.4). 0 ch Ole - . .............. X ... ............. 1 (17A64) 0,V,hjQfmenZenv -.- ........... ... . 8 . ...... 100 (455) DmhjC9,,=parlV C I DDO (454p 0 chlmp OrWR 6 100 (454) .. ........ ... . ..... 100 (415.4} 2,�.-Dlr�hlmpropirin,c ao,4 . ..... . 5.0% (2,270) ❑ichilo=6 ... . .... .. A .... ... ........ 10 (4.54) Dicufal A 10 (4.54) D,e idn,n ........ X 1 (0,464) NO �hylllr"llne 8 100 (454) umethylarrimo . .. .......... ...... .. . C 1,W0(4541. DimrDbenzene (mixedp 11 1. (46,4) MrkrophenDl .. . ..... .. .. . A . ... ... 1U (45.4) . . .. .. . .. . .............. ..... ........... 10 P4.59) 0,4jot C 1,000 4'464) S2D WTO%cirp X . .... .... .. . . 1 (IJAM) ron ............. .... . 0 100 Q45.4) Dodwylbenzeneautfonse Lad r.' I U010 (454) E,ndmuftn .". ........ ''. - X 1 tuA"p Endnn X 1 (0.454) EF40P110rohyd'M 11 , --rl- - S 100 1454) Ethion ...... .. .... .... ......... .... ... ... .. ... ..... .. ......... ............ ...... . . ...... A 10 (4.54) Ethyb"zeria C I 'ON) (454) ftytenedmrr,rm . ..... .............. D 5,000 (2,270� M,yWrm*mmmv-Wraar,alUc end (EVTAp ..... ........ 0 6XIOU (Z270) EthylarPo d6mm'de -- . ...... X 1 Q0.464) Ethoono dwfilando . ... .. . . . ... . ...... ..... ..... .... ...... ....... . . .... .. B ..... .............. 100 445 4) F er"r, ammomm d1rate 1,0011 (454) Ferric ammmium oxaWe 1,0110 (454) 1,,000 (4,1A) For %06ft ..... . .... 100 (A$ 4) Forric mmta ......... .... ............ C �454� Fernr mlate C 11�000 ODC 454 Ferrous amnion rant sulfew C 1,00U (45'4J Femius chio-de .................... S . ......... [00 145,4) Ferrous syatatv G 1.00E (454 Formo4ebyde . ........ . ......... . ............ ?00 145.4). Form c sod D 5,000 (2,270) Fwnam acd 0 5,000 (2,2 70) PUrforall ......... ... .... ........ ..... . ............. GL)V%jon . .... .. .... X t ( 0,464) HOP12CITIOr X I O 464) ........ A 10' (4-.4) Hydnx.riltinc acid .. .... .. 0 5,000 (2,2 70) Hydmfluonc ircid 00 (44,4) Hydiog,ar, cymda A 1044 54) HydTog.m s.1fid . ................ ... ............. .... . ...... ..... .... ..... . . .......... ... ........................ .. a 106 (�L9 4) 160pr011e 100 P45 4) lgtyprnpmrtoiamme doulacyibariyermsulloriato ........... C .... ................ 1.000 (454) Kepone. ............ ......... ................. .... .... ... ........... ................ .. ........... X ......... .... 1 (0 454) Lead mcalalm I. -.. 1. 1. - ...... .... ......... ..... . A 1(7 (4.54) Loadar"rieto ........ ..... .. .... .... . ......... .......... .. ................. X ..... ............. 1 (Y,454) Loud 01orido A . .......... 10 J4.54) 1 "d puziborale A 10 t4, 54 L eaJ fluondle . A 10 4.541h Load iodWo A 10 (4,54) load ,itrrlo A 10 j4, FA Load 5ttl'Afalo A 10 (4.64 i.aad sulale . .... .. ............. . ................ A 10 14_") Load sUlfift A 10 (4,54) Lead 0,acyaDoW . ..... .... .... .......... . ..... A 10 84.54) L;dano .. . .. ...... X 1 (0,464) L �Kum chrarnale A 10 (4L54) MM�sjthan , � -1-1 B IGO (45 4 me 81c ae'd D' 5,00c (2,27C) mam,c anhvdride ........... .. .... . . .. ................... ............ .. ........ .... .. . .. .... .... .... D 5.000 42,2 70) M emapoomerthur A 16 (cw Momurw, ryando X 1 ((1-454) MeMun,0: mtlile ........... ........... . ..... ..... A ........ 10 (4.64) 713 117.3 40 CiFR Ch. li (7- '1'-99 Editi'l TABLE 117.3 REPORTABLE QUANTITIES OF HAzARGQ4.IS Sussrmas DEsv4ATr.D PURSUANT To SECTION 311 OF THE CLEAN WATER ACT—Continued 141aterlal Category #4Q Vn pnonds 1414 txgra....ma;. N Morcunc sulN to 1111... 1111. 1111 ...... . .............. . .... 1111. 1111.... A. .. 11,11.,......, 10 (4,54,! Mercuric thlucy'anata ............... ....... .......... A .... 1014.54) Mgaercuruars nilral,o ..................... ... ........... ......... A ......... 10 (4,541 Vethoxych'Wr . __ . . ... 1 (0.4547 M4ethyi r7wcoptan ............. . ......... . ........ .,...,,.......... 1111... ,1111., t7.......... ,1111. 11'10 (45A) P aiihytl molha "Tatra .... ....... 11 1.1...... ............. 1,001) 054 methy4 parathvan ......... ,1111,,..,- B , , ,1111.. 100 (45..4p 1111.. M4,wr,pbos .. .. ............. .. ... ... _,.. , ......... , ... A .... 11..1.1.,. 10 (4.547. ...� MMexacarhaals . ....,. . , 1111... ....,...._ ... . .. ............ ........................... C ,1111_.. 1,0 F.Nf1 (4 U) Mua�hcaalh'ylaaruroa 1..11.,1 ..... ......... B.... , _,11,11 IOU 145..4) A1rrraortrrt ly(amimra ,,1111.. ............. .....� ....� .........��.... ..�...�............ B 100145 -4) N:aWd __ ...... .. .......... .... 11.... 1 ., ............, . _............11_1,1... A , 1..1.....11.. 10(4.5+4),. N;aerib"Irene 1111..,,_.. .. ,.. ,..._111,1 ,.. ........, .,,.,,,. ............ .1111,.. E4 "100(4"5.40 Naphlarenicarid 1111......,. B ,. 1111. 11)0(45.4) NicW arrmromom suifal5 .,1111 ............ . ........... ..,...,,... .., 5. ,.. , 100 (45.4) N irakal 0lande... 11 6 1,111.. 1000(40)14) ZcW hydroxide ... ..... ................ ........... ....... ........ .......... .11,11. A .. .......... 10 (4.�54,M N,c *el mtratq ___. I 1 ._. _.,. _1111 ............. 11,11,., B . 1,111,.. 14504 445...4) Nicx.etdadlraPe ........ ... 1...111,....... B ... .., �,., 100(45 -4) Nena1said .. ............ .._ ............., 1111 �..� .�...., . ..�.., ,1,111, C , .,....... 1 040 (454) NXlrobonxona .. ......... ............... .. ........ .... ....... ....._., ....................... _... C ,1111... 1.1.00(454) NOogen dtox,ds ,1111,,..- ,...,1,11_1,_ ... 11,11.., . ...., A IU(4,549 N.ilrnph mwa (m?ixed) 1111., .., , 1111.. 1111....... , 1,1.11.. ..,.,,..,.., 111,.1...... B .... .. . 100 (45..4 �I NnirWalubl)0 1 ...1.11......., .......... C1 , ....,_...,..,. I.0G0(4,4) Paraluma4dehyde ........... ........� ... .�...... ., ,,, 11,11 ., ., ., ........_.._..,. Q ,............... 1.000 4454] Parathion .. .. 11,' ..... .... .............. ... 1111,,. 111 1 ..._.,.. ... 1111,.. .,...... A .......... 10(4 54) Pontachlamph�and ..,..... ... _...,_. ... ................ .... .1,11,1... .. 1111.,.. 111.1. A . ,......... 1014 54) Phenol......,.. 1 1 ......... _1 . . .. .......... . .1.111... 111,1.............. ... ..... .... 1,111.. Q .. ............. 1,000 14.54) p1h,o...geroe .,. 1111... ,........ ,1111.. ,......... ... 1 11 , ... A . 1 111... 10 14 -6I Phu ptionv. and .., ......... .... Ct ._......... 5,00012,27l Phosphorus .... 111 1 .. ..,..,... 1111,. k ,. .......,,. 1 (0.454).. P4logiborus oxychkmde .............. .. . .......... _.. ,............... ....... ........ C ......... 1.000 (454) Phosphorus ponUizutrida ,....,...._, . , , 11,11., ...,,....,. .......,.,...,...... B 1!441(45,4) Phophotus lrichluTlda .. , ...,. ..... ,, . Q 1111. .,. .,. 1,0001454) Pu8ga;411¢5rrm'aCed biphsenyl!s _...,... ..1 .,,.11.1 ..... ............ ..,..,.,. .....,.... X... .., ,,1111 1(0,45A1 P utassium ar'.senals . ...................... ....,........, 1111 �.. ,. ........_.. ,......_.. x ............. 1 10 4544 Pales. um arsenda ........ .... ............. .. .. 1111... , ,.....,..,.... .. „... ,........ ........... X 1.1,11, 1 (01454( p U48RBJ. W',hmflmn.ale ,. 1111.. __ ' __. 11,11 ......,.. Rw .....,_....... 10 (41"5.4) P'I:AtSd�9 @%UM 0110rrmatrd 111,1.. . ,... , , 111,1. ....,...,. ......... . 11...1.....11111.. A ....,..... 1Q 44,54p PC, U,1$ ", cyanide ......... .,..... 111,,1. ...,.,..� ... . ..........�.....,..� A ,. ..,..,,., 10 (4.54) Putass��,,m,. 4lydrrraide ....... . ,111,1., ........... ............. ..,_ ,, Q _.. 1;0100 44'.541 Pulamum permanganate ..........,, 11 1 1....... ...,,.., 111_1 ............ .......... B ., . ...,..., 10101 (45.41 Prrapair'gide .., ... .... ........� .. ........... „ ...... . , ..............__........,. A . ,1111... 10 Q4.!A) Prf.paat c Barad r 1 111,11.1 -. 1.111. I _... 111,1, .....,,,,, 11 .. .,. 9.000 12.270). PrQpruudd arftdnde Ct ............... 54)'15012,2'7Cp) Pro4y1w,eaxlda .,1.1..11 ............ .......... B , , .,,,..... 110445..4'9 Pyrelhfin.4 .., .......... ............ ............. ., . 1,111... ......... x. . ..1.111... 1 (1 40541 1,1,11 ,1111 Quanotrra' ,. ... ,......... �. ...� .... .............. .... .. Q . ...,.,.... $,000i2,270Y Resoromo ....... . 1111 111.. .11 ...... 5,00 12,2709 .yaatanrlArrl r-do .. 1111 11,11 . .. ............... ..............1111. ..., .,..,....,. A .......,..,.. 1( Y 14.54). $ulaar n6at8 ......,.... .... X ... .. 1,111,... 1 40.45!41. Sod7ram .,.., . 1, A 11,,1,1 10 14.0.4) Sodlow, aesenala 1111 1111,.. 1,1,11. 1,111 ....................._ X, ,.. .. „,111,1 1 (4.454) 'UrIIrarrr aut"ia llt$ ,.....,.,, 1111.., .............. ... . �.... �.�....� . 1111... 'X' ., .......,., 1 I1 4% rx,4,uYm blchromate 1111.,. ,1111... .............. ... .. ��.,� .. ... . ,.�.� ...,...... A ., ,....,..... 117 14.541 $odium 4ftohdar ,.._.,.._ ......._....., .. 1,,. ,..1.11 ... ............ ......., „. 01 ...,...., 100145.41 $e4111JIMbla�wtflta ,- 11,1,,1 0 ., .. ,,.,,. ffi,0001d,27t5I Sod,lu. Chromraltt ...,....,.., �,......... ....,....,. ......,,�..... 1111 1,111.. ,...�.. A .......,.. It (4,$4) S,odwm cyanide 1 ,111..._,.. , ......_.. ...._,...... ......... .........,_... A ,......... 10 44.54) lodrumOpOecylboazaneuullonat[ro C 1,000(454) SlVUQnda C $t)druMhyad'rtr5wtrlda 11, .............. . ...._..._..... 11 11. ,............. .......,....... ,1,111.., 05 ....,..,., 51700 (2',:Itdl7) .Sindilimhydruxida ,1,,111., .,_ ,.,,, ..., ............ Q 1111 ..,., 1,0X00(454) Sndrum hypnchiante B 100145.41 ScAllum mslrbytate ................ .......,... ,. 1111. ,,..,. ....,,.......... .......,.. ............. Q , , .,...... 1,DD0 (454) Sodium mtr €te . ,. ,. ......... .. ...... .... . ..... .:11,11... , . 1111.,1111.. . 1111._,,.,. 1111.,.. B ...1.11,1.., Iola (45,.4) Sodrum p1'm9phate, druriiasic ....,....,. 111 1...,,1111 . ..................... .. ..... ............_,. 0 .....,.,... 9,001 $2,270( Sod,u�rr,phosph'ate, Inbasic ......... ....�_.,. ...,.,.... ah _............. 5,0010 (2 „,270 Sod;urru tlenola . .. ......... ..,,., .......�... ,....�... ..... „..... B 11,,11,,,. 1 4 (111 (45. ) SbdnCp4iaP¢ chrufatata �..,.. .......,.. .�..,...,.. 1111 .. 11,11, . .111 1... ........ A 1,1 1 1.. , ..,,. w 14.:i4y SAly Chrrhe , .. 1111,,..... ......... . . ..11...11, ........ A 10 (4,64'D NE Environmental: PTotection Agen:cy § 117,11 TABLE 1'17 REPORTABLE QUANTITES oF HAzARoous SUBSTANCES DESIGNATED PURSUANT TO SECTION 311 OF THE CLEAN WATER ACT —Conti hued'. matenw --T —C-1-9-1—Y-50 m pountls $k oagraams) Styram 1111,. 11-11-1 111-1111-1—L 11. 1�.. 1111 - I .......... C 1,000 7(454') Sulfunc acrid C 1,000 1454') Sulfur monoelflonde C 1,0M (4541 2.4.5-T acid C ............... 1,.000 {464) 2,4.&,T ammes ... ... ........ . .... ... 0 6,000 (2,274� 2,a 5•T estafs ... .. . . ........... ........ .................. C ........... t,%O (4$4i 2 5-T salis ....... ............. C ............... 1,000 1464) TDE . . ........ .... ...... .. .... .. ..... .... . . ...... X 1 10,047 2,4,5.TP, acdd . .... ..... . .......... .... 11,.. Im (45,45 2,4,5, 1'R acid asters 11,11, ......... .... .... .... .. ............ . . ............ . .........1 1 .11.. 100 (45,4p Tetraethyl kJad A 10 (4.54) Tretrauthyl pyrophosphala ..... ..... A ............ 10(4.64) 1h@IkUM S'lIfte E ................ IM (45,4) ICAUeffe ...... C ..... ............ 1,014 8464) Toxapbene X .. . .......... 1 gM454)� Tnehlorfon B .................... 100 145,4) TmWoroaftylena ............ .......... B IM (45A) TnchIorophenol rr ............ ... ... .. ..... ...... ........ .......... ... ......... A 10 (4,541 TnethanoMmme dodacyMenzenegu4male c ......... .......... . 1,000 (454) . Tneftlamlm ............ D ..... . 5SW (2,270 ) ... ... .. . TrImethylamine .... ... . ...... V)O (45A) UFM)Yk amNafa B 100 (45.41 Uranyt mUsta .... ... B 100 (45-4') Vanad,urn p"loxide ... .... ... .. 1,000(464) Vanadlyk Buffmo c 1 000 (41A) r,.,,, Vmyl RGAWle D � Vmyfftlene chonde B 100 (46.41 XyVef`L (MIX&d) B ............ 100 (45,4) Xy@flDi .. .... .... .... 1,l= t,464i Zld n C, aCa4efe . ......... C 1 0OU (4 64} Zinc aimmorkim cbImde C 1.0M)(454) Zinc bat'n C .... ................ 1,000 1'4 $4) Zinc bm" ' dr, C 1,000 (464) 21nc carbon ale C 1,000 (454) L n c chk,)nde C 1000 (464 ZM: q8M"dV .. ..... . ... A lb g4 64p Zmc fluwda ......... .. . C f.046 f,454 Znc farmakO C I DOD 4454 Znc hydrosulfile C I 000 (454) ZIM OlArAlb C I M) (4 54 ) Zme . . ....... ...... ... ... ........ D 5.000 p2ro) Lfic phubpri'de .... .... ... ...... ... ... B IOU ¢45 4 ) Zhc Ai hcon uuodm .. .... ... ..... ....1.11...1 1) 8,000 82,270) Znx Villals . .... .... .... C ............. 1,000 8#549 ) Mirdle ...... ..... D — -141111 555,000 ¢2,270� zbfconi.m pota!Wm f m'je . ...... C ................... I ,0,00 (454) ZZomum suffate � . ... .... .... .. ......1.111... ....... .. .. .... ... .... ...... D ................... .. 5X,00 Q2,270� l Zi wmmm Welfach 0,mile D ............... .... s,10,00 Q2,270i l50 FR 13513, Apr. 4. 1985, as amended at 51 FIR 34547, Sept 29, 1986. 54 FR 33482, ALIP, M 19M 58 FR 35327. June 30, 1991 60 FIR 310937, June 12. 1995] Subpart B—Applicability §117.11 General applicability, This, regulation Sets forth a detef, mination of' the reportable quantity for each substance designated as hazardous in 40 CFR part 116. 'T'he regulation ap- plies to quantities of designated sub- stances equal to or greater than the re- portable quantities, when discharged into or upon the navigable waters of the United States, adjoining shore- lines, into or upon, the contiguous zone, or beyond the contiguous zone as pro- vided In section 311(b)(3) of the Act, ex- cept to the extent that the owner or operator can Show such that dischargeA are made� (a) In compliance with a permit, IS'SiAt'd Under the Marine Prote. c t ion, Research arid Sanctuaries Act of 19,72 (33 L%S-C, 1401 erseqj; (b) In complianre with approved water treatment plant operations as 715 Release Detail Sheet When a release exceeds the Reportable Quantity (RQ) level as outlined in EPA regulations 40 CFR Part 110, 40 CFR Part 117, or 40 CFR Part 302 the permittee should fill out the following Release Detail Sheet and submit to the City of Coppell within 14 days of release. (NOTE: in Texas, the RQ for Hydrocarbons is 25 gallons spilled to soil and 1 drop spilled to water) Date: Description: Why the spill happened: Procedures to prevent future occurrences: Response procedures should a spill occur again: The person in charge of the site at the time of the spill shall call: National Response Center 800.424.8802 and the TCEQ Release Hotline 800.832.8224 and the City of Coppell Engineering Office: 972.304.3679 Fax: 972.304.3570 Email: engineer @ci.coppell.tx.us )PERATOR FORM This form should be maintained and attached to the SWPPP. BMSC /Naterra Corporate HQ in Coppell, TX The dates when major grading activities occur: The dates when construction activities temporarily or permanently cease on a portion of the site: rtes when stabilization measures are initiated: (see ACTIONS TAKEN FORM) Dates Dates Portion of the Site Construction Entrance Silt Fence Erosion Blankets Riprap / Rock dam Concrete /Paving Hydromulch/Seeding/Sod Certification Statement: "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 upon 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 that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." NAME: TITLE: SIGNATURE: I ACTIONS TAKEN FORM Actions taken as a result of inspection should be maintained and retained as part of the SWPPP. Describe all actions taken as a result of inspections OR retain all invoices pertaining to SWPPP compliance and describe all actions self - performed as a result of inpections. Date: Actions taken as a result of inspections: Date: Actions taken as a result of inspections: Date: Actions taken as a result of inspections: Date: Actions taken as a result of inspections: Date: Actions taken as a result of inspections: Date: Actions taken as a result of inspections: Date: Actions taken as a result of inspections: Date: Actions taken as a result of inspections: Date: Actions taken as a result of inspections: Date: Actions taken as a result of inspections: Date: Actions taken as a result of inspections: �R t a � 5 i R < R i too I oil � � G Ink V 5 i 15 i a a a a Ca a Cc CC CC t L a S LL CC �' aCC LL � LL S LL LL S 3 g� IL IL �� LL IL LL LL LL LL LL LL LL LL LL LL �� LL IL 3 LL if .3 r H 91 ffia q� �$q$$I}� iC $ 11 5 1� g �¢C�3 rgau L{�'t$ZSk — Q S F i i3 Sr c� �a rc Ib a pi rM V..) M a 9aj M All I Iii M [11 Fmk M 1'!111 11 1 Ir" 11 VAS r R K 8� A 83 R A A R R A 0 8 R R R A LL LL LL LL IL LL LL LL LL LL LL LL LL LL LL ILL LL 1L LL F 43 F LL LL LL LL i a S S a e r o � x$12 'R O 4f;a< R r1l M ri M E.7 VCD qui u m It 9 M fwd �II o A R R R R!: 'i 7 7 .. s . _.. - .,,,,,,,,,, ....... .,, ..., .... ,,,,,,,. ...... i p�p I� A r r dli Il) aj sss� 12 I �8 F 2 R t I �p F A A e iR R A q �A F 7 �R A LL LL LL LL IL LL LL LL LL LL LL LL LL LL LL ILL LL 1L LL F 43 F LL LL LL LL i a S S a e r o � x$12 'R O 4f;a< R r1l M ri M E.7 VCD qui u m It 9 M fwd �II o A R R R R!: 'i 7 7 .. s . _.. - .,,,,,,,,,, ....... .,, ..., .... ,,,,,,,. ...... i p�p I� A r r dli Il) aj sss� 12 I �8 a yZy� F V �V y� m 0 z R Q €ag TLL. LL LL LL LL L IL 4 LL LL LL li LL LL IL 1� LL LL LL �' ICL LL li � Ol n N �l N • .n • • ivy N N N N b N 0 0 O N N N N O O A F& bQ N O N b R N y � 3FW tl tl` tl Ij LL LL ILL LL LL LL LL 1L 4 �' �' • •• ffi R R S R R R R° R R R 3 �S S 1 All tl i r e c a e e R L ' me s g a s as a s s s a s s s s a a a 8 € g e a r# oil n i gi mill' R i 5 I lill R EE Q €ag TLL. LL LL LL LL L IL 4 LL LL LL li LL LL IL 1� LL LL LL �' ICL LL li � Ol n N �l N • .n • • ivy N N N N b N 0 0 O N N N N O O A F& bQ N O N b R N y � 3FW tl tl` tl Ij LL LL ILL LL LL LL LL 1L 4 �' �' • •• ffi R R S R R R R° R R R 3 �S S 1 All tl i r e c a e e R L ' me s g a s as a s s s a s s s s a a a 8 € g e a r# R a a n ti � r�A R r au zR II p iL If.... 0 LLJ 6k° III ou " "fill I � fit, I it fill Ri A . R p R w ' w w f ^^ w w w w w y a � w♦ w w w w w w w w w a w w w w w w w a w w v w v w w w w w w w R R 9 R 9 9 o 9 n o n n n v m v v o o n o h o 0 0 o It [fi if all I.. 3 Iff, R A A .............: R R A Am tR ',. LL IL LL LL LL LL LL LL LL LL LL LL LL LL LL� LL� li LL LL 1G fj V o 0 0 0 0 0 R 2 a 0 I it I I LL � LL LL 4 LL LL � LL LL IL LL rWf �wr 1 33$8y]]! i �R EFLIM 12 R A A 9 a w A ��a A x e i Ii lot t; g R Q � o O f t f ♦♦ f � � r Y f f r Y f f ♦ N !1 f t f f f N N LL 1� LL LL LL LL LL LL LL LL LL;E a Y LL LL LL IL LL 11 IL IL LL IL LL LL LL LL ILL LL 1E LL lei Elm Y Y Y Y r r Y f f f t t n A f t f ♦ f f ♦ f ♦ f f f K'6'6 S a f 0 T M or, P� 11 $ r F Bg� e y ip gal 11a� x 8 2 @R iR A R q R �R A SoU �R 8 N N Fl $ 3 5 $ t d s G oi < 0 E➢ 15 0 1121 Mk ER VII 0 MP B m VIA GI UJ C,oFaa aaa� aa�sa� ssa�a r %,. ,,, SWPPP www. mppp, com OFFICE: 972.530.5307 FAX: 972.530.5309 PO BOX 496987 GARLAND, TX 75049 This Storm Water Pollution Prevention Plan (SWPPP) is complete when combined with the most recent Site Map from SWPPP INSPECTIONS, INC. (For the most recent Site Map, please see the inspector for SWPPP INSPECTIONS, INC.) The "Operator Form ", "Actions Taken Form ", and inspection reports must be completed and retained with this SWPPP.