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SECTION 3 – STORMWATER <br />35 <br />3.) The full length of each section of pipe shall rest solidly upon the pipe bed, with recesses <br />excavated to accommodate bells, couplings, and joints. Pipe shall be firmly set on a good <br />foundation and care shall be taken that pipe does not rest on stones, rock, or any unyielding <br />material. Pipe that has the grade or joint disturbed after laying shall be taken up and re-laid. <br />Pipe shall not be laid in water or when trench conditions are unsuitable for the work. <br />4.) Installation of the storm sewer shall be in accordance with the pipe manufacturer’s <br />recommendations. <br />5.) Install RCP to conform to ASTM C-1433. <br />6.) Installation of PVC storm pipe shall conform to ASTM D-2321. <br />7.) Installation of ductile iron pipe shall conform to AWWA C600. <br />3-3.3 (e) (v) PIPE CUTTING <br />Cutting of pipe shall be done in a neat and workmanlike manner without damage to the pipe. Unless <br />otherwise recommended by the manufacturer and authorized by the Engineer, cutting shall be done <br />with an approved type of mechanical cutter. A wheel cutter shall be used when practicable. Squeeze <br />type mechanical cutters shall not be used for ductile iron. <br />3-3.3 (f) STORM SEPARATION OF WATER MAIN <br />3-3.3 (f) (i) PARALLEL INSTALLATION <br />Normal Conditions: Storm sewers shall be constructed at least ten (10) feet horizontally from any <br />existing or proposed water main. The distance shall be measured edge-to-edge. <br />Unusual Conditions: When local conditions prevent the prescribed horizontal separation, then <br />maximum horizontal separation shall be provided with vertical separation of bottom of water line <br />at least eighteen (18) inches above top of sewer. Where this vertical separation cannot be obtained, <br />the sewer shall be constructed of water main-grade pipe and fittings, conforming to AWWA C600 <br />for ductile iron pipe or AWWA C900 or C905 for plastic pipe installations. Storm structures shall <br />have epoxy coating exterior treatment with watertight pipe connections. <br />3-3.3 (f) (ii) CROSSING <br />Normal Conditions: A storm sewer crossing any existing or proposed water main shall be laid to <br />provide a minimum vertical separation of at least eighteen (18) inches between the outside of the <br />water line and the outside of the sewer whenever possible. <br />Unusual Conditions: When existing conditions prevent the prescribed vertical separation, conform <br />to the following: <br />1.) Storm sewer passing over or under water mains shall be constructed of ductile iron pipe <br />(Thickness Class 50) with mechanical joints or PVC pipe (SDR 26 or SDR 21) as described in <br />parallel installation, unusual conditions.