R-2009-01 adopt amendments to Public Improvement Criteria Manual (PICM), relating to drainage criteria and improvement standards

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requirements of ASTM C 76, "Reinforced Concrete Culvert, Storm Dmin. and Sewer Pipe," current revision. Reinforced concrete pipe shall be Cla.'ls III or stronger. The design engineer shall provide for increased pipe strength when conditions of the proposed installation exceed the allowable load for Class III pipe. All concrete pipe constructed in water-bearing soil or forty-two inches (42") in diameter or larger, sbalI have rubber gasket joints meeting the requirements of ANSI/ASTM C 443, "Joints for Circular Concrete Sewer and Culvert pipe. Using Rubber Gaskets", current revision. Concrete pipe with diameter of less than forty-two inches (42") may be installed using pipe with tongue and groove t)'pe joint and Ram-uelt, or approved equal, as a joint filler. When specifically approved by tbe City Engineer, reinforced concrete arch and elliptical pipe conforming to ASTM C506 and ASTM C507, respectively, current revision. may be installed in lieu of circular pipe. Reinforced concrete box culverts shall meet the minimum requirements of ASTM C789, "Precast Reinforced Concrete Box Sections for Culverts, Storm Drains, and Sewers", current revision. Pipe joints for arch and elliptical pipe and box culverts shall be sealed using Ram-nek or approved equal. 5.8.2 Storm sewer outfalls into open channels shall be constructed using corrugated steel pipe. Corrugated steel pipe sball be manufactured in conformance with the requirements of AASHTO Designation M-36-82, current revision. Pipe material shall be Aluminized Steel Type 2, meeting the requirements of AASHTO Designation M-27-791, current revision, or Pre-coated Galvanized Steel, AASHTO M-246, 10 mil coating on both sides. All pipe shall have a full double coating, Type A, in accordance with AASHTO Designation M-190, current revision. Pipe joints and fittings shall meet the minimum requirements of these specifications and shall have an O-ring gasket seal meeting the requirements of AASHTO C-361, current revision. (See City of La Porte Construction Details). 5.8.3 Stonn sewer outfalls shall have a slope protection to prevent erosion. Slope protection may be constructed of slope paving or rip rap. Slope paving shall be four-inch (4") five (5) sack concrete with six-inch by six-inch (6" x 6") welded wire mesh (W14 x W14) or three eighths inch (3/8") steel rebar on twenty-four-inch (24") centers, each way. Rip rap shall be a minimum of six-inch (6") broken concrete rubble with no exposed steel or well-roUllded stone and shall be a minimum of eighteen inches (18") thick. Slope protection te:\turing shall be required where public access likely. Refer to the Construction Details for minimum dimensions. 5.9 ADDITIONAL REQIJIREMENTS 5.9.1 Minimum depth of storm sewer (measured to the top of pipe) shall be twenty-four (24") below the top of curb or finished grade, whichever is lower. Minimum size storm sewer for main and inlet lead shall be twenty-four inches (24"). 5.9.2 Storm sewers shall be bedded using cement stabilized sand (see specification in Section 4.2.3) as shown in the City of La Porte Construction Details. 5.9.3 Pipe requirements. A. Reinforced concrete pipe installed at a depth greater than thirty feet (30') shall be designed by the engineer for the specific installation and approved by the City Engineer, Reinforced concrete pipe shall be designed in accordance with the American Concrete Pipe Association, "Concrete Pipe Design Manual", Ma.~mum cover on the pipe shall be measured from the top of pipe to the ultimate fmished grade or natural gr01md, whichever is greater. B. Corrugated steel pipe shall have a minimum thickness as follows: PIPE SIZE (Inches) Corrugations (Inches) 242-2/3" X 112" )0- 482-2/3" X 1/21 MINIMUM THICKNESS 0.052 0.064 Stonnwaler Criteria Page 9 of 10