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<br />e <br /> <br />e <br /> <br />5.8 STORM SEWER MATERIALS <br /> <br />5.8.1 Storm sewer and culvert pipe shall be precast reinforced concrete pipe, unless specifically <br />approved by the City Engineer. Concrete pipe shall be manufactured in conformance with the <br />requirements of ASTM C 76, "Reinforced Concrete Culvert, Storm Drain, and Sewer Pipe", <br />current revision. Reinforced concrete pipe shall be Class ill or stronger. The design engineer <br />shall provide for increased pipe strength when conditions of the proposed installation exceed <br />the allowable load for Class ill pipe. All concrete pipe constructed in water-bearing soil or <br />forty-tow inches (42") in diameter or larger, shall have rubber gasket joints meeting the <br />requirements of ANSI/ASTM C 443, "Joints for Circular Concrete Sewer and Culvert Pipe, <br />Using Rubber Gaskets", current revision. Concrete pipe with a diameter of less than forty-two <br />inches (42") may be installed using pipe with tongue and groove type joint and Ram-nek, or <br />approved equal, as a joint filler. When specifically approved by the City Engineer, reinforced <br />concrete arch and elliptical pipe conforming to ASTM C506 and C507, respectively, current <br />revision, may be installed in lieu of circular pipe. Reinforced concrete box culverts shall meet <br />the minimum requirements of ASTM C789, "Precast Reinforced Concrete Box Sections for <br />Culverts, Storm Drains, and Sewers", current revision. Pipe joints for arch and elliptical pipe <br />and box culverts shall be sealed using Ram-nek or approved equal. <br /> <br />5.8.2 Storm sewer outfalls into open channels shall be constructed using corrugated steel pipe. <br />Conugated steel pipe shall be manufactured in conformance with the requirements of <br />AASHTO Designation M-36-82, current revision. Pipe material shall be Aluminized Steel <br />Type 2, meeting the requirements of AASHTO Designation M-274-79I, current revision, or <br />Pre-coated Galvanized Steel, AASHTO M-246, 10 mil coating on both sides. All pipe shall <br />have a full double coating, Type A, in accordance with AASHTO Designation M-190, current <br />revision. Pipe joints and fittings shall meet the minimum requirements of these specifications <br />and shall have an O-ring gasket seal meeting the requirements of AASHTO C-361, current <br />revision. (See the City of La Porte Construction Details). <br /> <br />5.8.3 Storm sewer outfalls shall have slope protection to prevent erosion. Slope protection may be <br />constructed of slope paving or rip rap. Slope paving shall be four-inch (4") five (5) sack <br />concrete with six-inch by six-inch (6" x 6") welded wire mesh (W14 x W14) or three eighths <br />inch (3/8") steel rebar on twenty-four-inch (24") centers, each way. Rip rap shall be a <br />minimum of six-inch (6") broken concrete rubble with no exposed steel or well-rounded stone <br />and shall be a minimum of eighteen inches (18") thick. Slope protection texturing shall be <br />required where public access likely. Refer to the Construction Details for minimum <br />dimensions. <br /> <br />5.9 ADDITIONAL REQUIREMENTS <br /> <br />5.9.1 Minimum depth of a storm sewer (measured to the top of pipe) shall be twenty-four inches <br />(24") below the top of curb or finished grade, whichever is lower. Minimum size storm sewer <br />for main and inlet lead shall be eighteen inch (18"). <br /> <br />5.9.2 Storm sewers shall be bedded using cement stabilized sand (See specification in Section 4.2.3) <br />as shown in the City of La Porte Construction Details. <br /> <br />5.9.3 Pipe requirements. <br /> <br />Stonnwater Criteria 10 of 12 <br />