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<br />e <br /> <br />e <br /> <br />Table 3.3 <br />WATER LINE - SANITARY SEWER CROSSINGS <br /> <br /> PROPOSED WATER <br />PRIMARY PROPOSED WATER PROPOSED SANITARY <br />CONDITION EXISTING SANITARY OR <br /> EX.ISTING WATER <br /> PROPOSED SANITARY <br />SECONDARY WATER OVER WATER UNDER WATER OVER WATER UNDER <br />CONDITIONS SANITARY SANITARY SANITARY SANITARY <br /> Less Greater Less Greater Less Greater Less Greater <br />IF THE than 2' than 2' than 2' than 2' than 2' than 2' than 2' than 2' <br />CLEARANCE IS but less but less but less but less <br /> than 10' than 10' than 10' than 10' <br />.Protection 1 2 3 4a or 4b 5 6a 3 6b & 6c <br />Requirement <br /> <br />.PROTECTION REOUIREMENTS FOR SANITARY SEWER CROSSINGS <br />(All clearances shall be measured from outside wall to outside wall) <br /> <br />1. One 20-footjoint ofC-900 or C-905 PVC, 150 psi centered over sanitary sewer; 6-inch minimum <br />clearance. <br />2. lfno evidence of sanitary sewer leakage, center one joint of water line over sanitary sewer; 24- <br />inch minimum clearance. If the sewer line is leaking, the sewer line shall be replaced with 150 psi <br />lined ductile iron pipe or other approved pressure pipe with appropriate adapters on all portions <br />of the sanitary sewer within 10 feet of the water line. <br />3. Not allowed. <br />4. a. Auger, bore & jack or microtunnell 0 feet minimum each side of sanitary sewer. Place <br />one 20-foot joint of C-900 or C905, 150 psi, centered under sanitary sewer. Fill bore <br />hole with bentonite/clay mixture or grout; 2 foot minimum clearance. <br />b. OR replace the existing sanitary sewer with 150 psi lined ductile iron pipe, C-900 or <br />other approved pressure pipe with appropriate adapters on all portions of the sanitary <br />sewer within 10 feet of the water line. <br />5. Minimum 18 foot joint of sanitary sewer, 150 psi lined ductile iron pipe, C-900 or other approved <br />pressure pipe centered at the water line, 6 inch minimum clearance. Also center an 18 foot joint <br />of waterline over the sanitary sewer line. The sanitary sewer line shall be embedded in cement <br />stabilized sandfor one pipe segment plus I foot beyond each joint. <br />6. a. Center a minimum 18 foot joint of sanitary sewer, 150 psi, lined ductile iron pipe, C-900 <br />or other approved pressure pipe on water line. <br />b. Use cement stabilized sand backfill for all portions of the sewer within 10 feet of the <br />waterline, as measured perpendicularly from any point on the water pipe to the <br />wastewater pipe (minimum 2.5 sacks cement per cubic yard of sand). The cement- <br />stabilized sand bedding shall start at a point 6 inches below the bottom of the sanitary <br />sewer to 6 inches above the top of the sanitary sewer and one quarter of the pipe <br />diameter on either side of the sewer. <br />c. Center a minimum J 8 foot joint of waterline on the sanitary sewer line. <br /> <br />January 2004 <br /> <br />Water System Design Criteria Page 12 of 13 <br />