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OR 130-A-1 Amends Ordinance No. 130 by adding a new section 6 estab. engineering & construction standards AN ORDINANCE OF THE CITY OF COPPELL, TEXAS ORDINANCE NO. 130A1 AN ORDINANCE OF THE CITY OF COPPELL, TEXAS, AMENDING ORDINANCE NO.130, THE SUBDIVISION ORDINANCE OF THE CITY BY ADDING THERETO A NEW SECTION 6 ESTABLISHING ENGINEERING AND CONSTRUCTION STANDARDS FOR STREETS, ALLEYS, DRAINAGE AND STORM SEWERS, WATER LINES, SANITARY SEWERS, UTILITY SERVICES AND STREET LIGHTING; PROVIDING A REPEALING CLAUSE; PROVIDING A SEVERABILITY CLAUSE; PROVIDING PENALTIES FOR VIOLATION OF THIS ORDINANCE NOT TO EXCEED THE SUM OF TWO HUNDRED DOLLARS ($200.00) FOR EACH OFFENSE; AND DECLARING AN EMERGENCY. BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF COPPELL, TEXAS: SECTION 1. AMENDING ORDINANCE NO. 130. That Ordinance No. 130, the basic ordinance of the City of Coppell, establishing the subdivision regulations of the City, heretofore passed by the City Council of the City of Coppell, Texas, on the 8th day of January, 1974, is hereby amended so as to add thereto a new Section 6 and made a part hereof SECTION 2. which is attached hereto as for all purposes. REPEALING CLAUSE. Exhibit "A" All ordinances, or parts of ordinances, inconsistent or in conflict with the provisions of this ordinance are hereby repealed. SECTION 3. SEVERABILITY CLAUSE. If any article, paragraph or subdivision, clause, phrase or provision of this ordinance shall be adjudged invalid or held unconstitutional, the same shall not affect the validity of this ordinance as a whole or any part or provision thereof, other than the part so decided to be invalid or unconstitutional. r SECTION 4. PENALTY CLAUSE. Any person, firm or corporation violating any of the provisions of this ordinance shall be deemed guilty of a mis- demeanor and, upon conviction, shall be punished by a penalty of fine not to exceed the sum of Two Hundred Dollars ($200.00) for each offense, and each and every day such offense is continued shall constitute a new and separate offense. SECTION 5. EMERGENCY CLAUSE. The fact that the present City regulations are inade- quate to properly protect the public health, safety and welfare, creates an urgency and an emergency and requires that this ordinance shall take effect immediately from and after the publication of its caption, as the law in such cases provides. DULY PASSED by the City Council of the City of Coppell, Texas, this 24th day of May , 1977. APP ROVED: MAYOR ATTEST: APPROVelED AS TO FORM: ~' 17 CITY ATT~7/EY - T SECTION 6 ENGINEERING AND CONSTRUCTION STANDARDS 6.01 6.02 6.02.01 POLICIES. Policies, terms and conditions to be followed in paving work, and the extending of water and sewer lines, are included 'in Ordinance 130 , dated 8th day of January. 1974 STREETS. All streets will be reinforced concrete pavement on a compacted subgrade. If, in the opinion of the Planning Commission and City Engineer an asphaltic concrete pavement would serve as well as a concrete pavement in an area it shall have a flexible base with an asphaltic concrete surface course on a compacted subgrade. Concrete pavement shall be provided with either an integral curb poured with the pavement or a separate curb constructed on top of, and doweled to, the concrete pavement. Flexible base pavement shall be provided with a combination curb and gutter section. Alignment, Grade and Width. REQUIREMENTS AND DESIGN STANDARDS. Grades. Gutter gradients shall be a minimum of four-tenths of one percent {0.40%}. The minimum gradient around curb returns shall be one percent {1.00%). All gutter grades shall be above the design water surface of ditches and storm sewers. All grade changes with an algebraic difference of one {1) percent or more shall be connected with a vertical curve. Crown sections shall slope not less than one-quarter (1/4) inch per foot. Width. Minimum width of streets shall be as follows: Street Width Back Classification' R.O.W. Width to Back of Curb Major Streets 80' 60' Secondary or Feeder 60' 38' Local Streets 50' 28' EXHIBff A T 6.02.02 6.02.03 6.02.04 6.02.05 6.03 6.03.01 Pavement Design. Pavement design shall conform to the following general require- ments unless otherwise approved by the Planning Commission. References to Texas Highway Department specifications regarding street work are references to the "Standard Specifications for Construction of Highways, Streets and Bridges" adopted by the State Department of Highways and Public Transportation. Concrete Pavement. All streets in new subdivisions sha'll be concrete. Concrete pavement shall conform to the requirements of Item 360 Texas Highway Department, Standard Specification. Concrete pavements shall have a minimum thickness of six (6) inches for Local Streets and a minimum thickness of seven (7) inches for Secondary Streets, Feeder Streets and Major Streets. Concrete pavement shall be reinforced with 3/8 inch deformed bars at twenty-four (24) inches center to center each way. Flexible Base Pavement. Where other than concrete streets are approved they-shall meet the following minimum requirements. Flexible base pavement shall consist of a base course and surface course of the type and thickness indicated below: Flexible Bases Course: Eleven (ll) inches of compacted crushed stone conforming to Item 242 Texas Highway Department, Standard Specification. Surface Course: One and one-half (l-l/2) inches of Hot Mix Asphaltic Concrete Pavement conforming to Item 340 Texas Highway Department, Standard Specification. Curb and Gutter. Curb and combination curb and gutter shall be constructed of reinforced concrete. Cross-section and shapes shall conform to standards on file with the City Engineer. Curb and gutter may be omitted in subdivisions having a one- family dwelling district zoning classification provided the lots are platted with a lot area of one {1} acre or more. ALLEYS. Pavement Type. All alleys shall be paved conforming to the requirements for street paving. 6.03.02 6.04 6.04.01 6.04.02 Paved alleys may be omitted in subdivisions having one-family dwelling district zoning classification provided the lots are platted with a lot width of one hundred (lO0') feet or more. Pavement Width. A minimum paved width of ten (lO) feet shall be required for all alleys. DRAINAGE AND STORM SEWERS. Adequate drainage shall be provided within the limits of the subdivisions. The protection of adjoining property shall be considered in the review of plans submitted. Size. Sizing of inlets, storm sewers, outfalls, culverts ~rainage ditches will be based on the following: Design Storm,- The design storm will be based on rainfall intensity-duration-frequency data published by the U.S. Weather Bureau. The design of storm drainage systems shall be based on the storm frequency shown in the following table: TYPE OF DRAINAGE FACILITY Storm Sewers Culverts, Bridges Ditches, Channels and Creeks DESIGN STORM FREQUENCY DESCRIPTION OF MINIMUM AREA TO BE DRAINED DESIGN FREQUENCY Any type of area to be drained with closed conduits 5 years Any type of area lO0 years 6.04.03 Runoff Computations. To determine the runoff rates for the various areas, the standard rational method will be used, utilizing the formula Q = CIA, where Q = rate of runoff in cubic feet per second, C = runoff coefficient, I = rainfall intensity for the particular duration in inches per hour, and A = the drainage area in acres. Drainage areas will be arrived at by considering location of high and low points on street grades, drainage divides in the area, and general configuration of existing and finished grades. 6.04.04 6.04.05 6.04.06 6.04.07 6.04.08 6.04.09 Runoff Coefficient. The runoff coefficient which considers the slope of the terrain, the character of the land use, and the imperviousness of the drainage area shall be deter- mined from the Master Plan for the City. The runoff coefficient for the appropriate land uses shall be as follows: Commercial Areas 0.90 Industrial Areas 0.85 Residential Areas 0.45 Apartment Areas 0.80 Park Areas 0.35 Paved Areas 0.90 Sizing of Sewers. Sewers shall be sized to carry the discharge (Q) derived from the above formula. Capacity of storm sewers will be determined by the use of Manning's formula on the basis of hydraulic gradients rather than the physical slope of the pipe. Minimum size of the storm sewer shall be 18 inches or equivalent. Sizing and Spacing of Inlets. On major streets, inlets shall be spaced to limit the spread of water in gutters so that one traffic lane on each side of the street remains clear during the design storm. On secondary and feeder streets, inlets shall be spaced to limit the spread of water so that one lane of traffic remains clear. On local streets, the permissible spread of water in gutters shall be limited by the height of the curb for standard street sections. On major streets, all inlets shall be recessed eighteen (18) inches from the face of the curb, and curbs shall be tapered to the inlet. Inlets shall be sized using standard recognized methods approved by the City Engineer. Ditches. Ditches shall be sized to carry the runoff (Q) ~ from the above formula. Design. Design of storm sewers, outfalls, culverts and drainage ditches will conform to the following general requirements: Manholes. Manholes (inlets or junction boxes) shall be pro- vided at all changes in grades or alignment, sewer intersections, and at a maximum of 500 feet on straight lines. If monolithic, reinforced concrete sewer lines are used, a manhole is not required where leads from inlets intersect the main sewer. Design of manholes shall conform to the City bf Dallas Specifications. T 6.04.10 6.04.11 6.04.12 6.04.13 6.04.14 Inlets. Design of inlets shall conform to the City of Dallas Specifications. Pipe. Pipe for storm drains shall be concrete pipe in sizes h the ap roved plans. All pipe shall be reinforced aS S OWn On concrete pipe {RCPI, ASTM C76, Class 3 except where in the opinion of the City Engineer, added strength of pipe is needed for traffic loads or for excessive height of backfill. Con~ crete pipe shall have a minimum cover of not less than one {1) foot over the top of the pipe. Monolithic, reinforced concrete sewers may be used for storm sewers thirty-six {36) inches and larger. Ditches. Drainage ditches, where approved by the Planning Commission, may be used for outfalls to natural or major drainage channels. Ditches shall have a minimum grade of not less than O.lO percent and side slopes not steeper than 2:1, unless side slopes are paved. Outfalls. Outfalls from sewers and ditches into natural drainage ways shall enter at the grade of natural drainage channel. If necessary, drop type outfall structures shall used to prevent erosion. be Major Drainage Ways and Structures. Design of major drainage ways through a subdivision and major structures, such as box culverts or bridges, across a ma3or drainaoe channel, shall be coordinated with the Texas Water Development Board. 6.05 6.05.01 6.05.02 6.05.03 WATER LINES The water distribution system shall meet the minimum require- ments of the Texas Department of Health Resources. Water systems shall be of sufficient size to furnish adequate domestic water supply, to furnish fire protection to all lots, and to conform with the Ma~ter Water Plan of the City. Location. All water mains shall be constructed in streets. ct iron pipe, Class 150 unless otherwise specified, with single rubber gasket joint, shall have a cement mortar lining of the "Enameline" type, or approved equal, and shall have a minimum cover of 42 inches. Water mains 14-inch and larger may be reinforced concrete steel cylinder pipe, Class 150 minimum. Fittings. Fittings shall be cast iron with mechanical joints and shall be cement lined, unless the pipe material is rein- forced ooncrete steel cylinder in which case special fittings shall be furnished. T 6.05.O4 6.05.05 6,05.06 6.05.07 6.06 6.06.01 6.06.02 Fire Hydrants. In general, fire hydrants shall be placed on block corners or near the center Of the block in such a manner as to place all of every lot within a radius of 500 feet of a fire hydrant in residential areas and within a radius of 300 feet in commercial or industrial areas. Fire Hydrant Fittings. All fire hydrants shall have one pumper nozzle and two hose nozzles with standard threads, shall have a main barrel valve opening of not less than 5 inches, and shall be placed on mains of not less than 6 inches in diameter. Six-inch gate valves shall be placed on all fire hydrant leads. Pressure Test. After the complete installation, the water- works shall be tested with a hydraulic test pressure of not less than 150 pounds. per square inch, maintained over a continuous period of not less than four {4) hours. If the test indicates a leakage in excess of ten {lO) gallons per inch of nominal diameter of pipe per mile during the four hour test period, then the leaks shall be found and repaired. All known leaks shall be stopped regardless of this test requirement. Disinfection. Prior to the acceptance and before any open connection to any existing water main is made, the waterworks shall be disinfected by using chlorine or chlorine compounds as to fill the new mains and appurtenances with water con- taining 50 parts per million chlorine. After chlorination and flushing, the Developer shall fill the waterworks with water and the City shall take samples of water taken from several locations, not less than one per section, or two per mile, for bacteriological tests. In the event the bacterio- logical tests are positive (unsatisfactery), the Developer shall drain the lines, and repeat the chlorination until the tests results are negative, Qr satisfactory. SANITARY SEWERS. Sanitary sewer facilities shall be provided to adequately service the subdivision and conform with the Master Sanitary Sewer Plan for the City, the.recommendations of the City Engineer and the requirements of the Texas Water Quality Board and the Texas Department of Health Resources. Pi__~.e. All sewer pipe in sizes 30" and smaller shall be vqtrified clay sewer pipe, Armco Truss pipe, or approved equal. All sewer pipe in sizes 36" and larger shall be asphalt coated concrete sewer pipe. Size. A minimum of 8-inch sewer pipe shall be specified, except ~ 6-inch lines will be acceptable only on short lines and in the locations where so approved by the City Engineer. F 6.06.03 6.06.04 6 .06.05 6.06.06 6.06.07 6.06.08 Pipe Joints. All sanitary sewer pipe joints shall be of the premolded type conforming to A.S.T.M. Designation C425. Location. Wherever possible, sewers shall be located in the alleys or easements and shall be 5 feet to 6-1/2 feet deep to invert. Grades. Grades and appurtenances of sanitary sewers shall conform to the requirements of the Texas Department of Health Resources. The following are the minimum slopes which should be provided; however, slopes greater than these are desirable: Minimum Slope in Feet Sewer Size Per lO0 Feet 6 inch 8 inch 10 inch 12 inch 15 iach 18 inch 21 inch 24 inch 27 inch 30 inch 36 inch 0 50 0 40 0 28 0 22 015 012 OlO 0 08 0 067 0 058 0.046 Infiltration. Prior to the acceptance, the Sanitary Sewers shall be subject to leakage tests. The leakage outward or inward (exfiltration or infiltration) shall not exceed 200 gallons per inch of pipe diameter per mile per day for any section of the system. The use of a television camera or other visual methods for inspection prior to placing the sewer in service is recommended. Lift Stations. All lift stations shall be designated and constructed with two or more sewa'ge pumps with total capacity of twice the design maximum flow. Detailed design data, plans and specifications of the pumps shall be submitted to the City Engineer prior to the purchase and installation of the pumps. Force Mains. All force mains shall be cast iron pipe, Class 150, unless otherwise specified, with rubber gasket joint, and shall have a cement mortar lining of the "Enameline" type or approved e,,al. average flow. a clea,si.g velocity of at least w feet per second shall be maintained. An automatic air relief valve shall be placed at high points in the force main to prevent air locking. 6.07 6.07.01 6.07.02 6.07.03 6.07.04 6.07.05 6.08 UTILITY SERVICES Construction. All services for utilities shall be made available for each lot in such a manner so as to eliminate the necessity for disturbing the street and alley pavement, curb, gutter, sidewalks, and drainage structures when connections are made. Water Service. Water service lines shall be a minimum of 3/4-inch Type "K" copper and shall be provided with a corporation at the main and a curb stop located at least 2 feet outside of curb with cover not to exceed l-l/2 feet. Sewer Service. Sanitary sewer service lines shall be a minimum of 4-inch, shall meet the same requirements for Sanitary Sewers described above, shall be constructed from the main to the lot property line using wyes and necessary bends, and shall have a minimum cover at the property line of four (4) feet, where possible. Stub Markers. The subdivider shall place a suitable marker at the point where said service lines are stubbed out so that these lines can be easily located for connection for future development. Utili:~ Extensions. The subdivider shall make arrangements with 1 other appropriate utility companies for the extension of their respective utility lines and service to and within the addition and for any costs or refunds of such costs. STREET LIGHTING. Street lighting shall conform to the latest edition of the Illuminating Engineering Society Handbook. Round tapered standards with bracket arms shall be used. Lighting levels as recommended for very light traffic in residential areas; medium traffic on feeder streets 'and heavy traffic on thoroughfares. Initial cost of installation and cost of operation and main- tenance for the first three {3) years shall be paid to the local governing body. Maintenance and operation costs after this shall be under separate contract.