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SECTION 4 – SANITARY <br />58 <br />4-3.6 SANITARY SEPARATION OF WATER MAIN <br />4-3.6 (a) PARALLEL INSTALLATION <br />Normal Conditions: Sanitary sewers and force mains shall be constructed at least ten (10) feet <br />horizontally from any existing or proposed water main, and any manhole or sewer system structure <br />shall be at least eight (8) feet horizontally from water mains whenever possible. The distance shall <br />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 ductile iron pipe (Thickness Class 50) with mechanical joints or <br />PVC pipe (SDR 26 or SDR21) with compression seals. The pipe should be pressure tested in place <br />per AWWA C600 without leakage before backfilling. <br />4-3.6 (b) CROSSING <br />Normal Conditions: Sanitary sewer or force main crossing any existing or proposed water main <br />shall be laid to provide a minimum vertical separation of at least eighteen (18) inches between the <br />outside of the water line and the outside of the sewer whenever possible. <br />Unusual Conditions: When local conditions prevent the prescribed vertical separation, conform to <br />the following: <br />1.) Sanitary sewer or force main passing over or under water mains shall be constructed of ductile <br />iron pipe (Thickness Class 50) with mechanical joints or PVC pipe (SDR 26 or SDR 21) as <br />described in parallel installation, unusual conditions. <br />2.) Water mains passing over sewer lines shall be laid to provide: <br />i.Vertical separation of at least eighteen (18) inches between top of sewer and bottom of <br />water lines. <br />ii.Adequate structural support for the sewers to prevent excessive deflection of the joints, <br />resulting in the breaking of the water line. <br />iii.Maximum separation of water and sewer line joints. <br />3.) Sanitary and/or force main pipes or sewer system structures: <br />i.No water pipes shall pass through or come in contact with any part of a sewer, force <br />main, or sewer system structure. <br />4-3.7 PIPE BEDDING <br />From the bottom of the excavation to a point one (1) foot above the top of the pipe, bedding material <br />shall be placed as follows: <br />•Granular material shall be hand placed/shovel sliced in loosely measured four (4) inch layers