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Detroit Dam. and Reservoir Minto Fish Collection Facility Rebuild (a) The top (crown) of the sanitary pining shall be at least 18 inches below the bottom (invert) of the water main. (b) Where this vertical separation cannot be obtained, the iron water pipe pressure tested in place without leakage prior to backfilling. (c) The sewer manhole or boxes shall be of watertight construction and tested in place. b. Installation of sanitary piping crossing a water line: (1) Normal conditions: Lay sanitary sewer piping by crossing under water lines to provide a separation of at least 18 inches between the top of the sanitary piping and the bottom of the water line whenever possible. (2) Unusual conditions: When local conditions prevent a vertical separation described above, use the following construction: (a) Sanitary piping passing over or under water lines shall be constructed of AWWA-approved ductile iron water pipe, pressure tested in place without leakage prior to backfilling. (b) Sanitary piping passing over water lines shall, in addition, be protected by providing: (1) A vertical separation of at least 18 inches between the bottom of the sanitary piping and the top of the water line. (2) Adequate structural support for the sanitary piping to prevent excessive deflection of the joints and the settling on and breaking of the water line. (3) That the length, minimum 20 feet, of the sanitary piping be centered at the point of the crossing so that joints shall be equidistant and as far as possible from the water line. c. Sanitary sewer tanks: No water piping shall pass through or come in contact with any part of a sanitary sewer tank. d. Where sanitary piping crosses existing culverts, the piping shall pass over or under the culverts without disturbance to the culverts. Where the piping crosses over culverts, adequate structural support shall be provided to prevent excessive settlement and deflection of piping. 3.1.1.2 Pipe Laying and Jointing Inspect each pipe and fitting before and after installation; replace those found defective and remove from site. Provide proper facilities for lowering sections of pipe into trenches. Lay nonpressure pipe with the bell ends in the upgrade direction. Adjust spigots in bells to give a uniform space all around. Blocking or wedging between bells and spigots will not be permitted. Replace by one of the proper dimensions, pipe or fittings that do not allow sufficient space for installation of joint material. At the end of each work day, close open ends of pipe temporarily 33 30 00. 00 25-9