(A) Building sewers shall be constructed using extra strength vitrified clay pipe, ASTM designation C-700; polyvinyl chloride pipe, ASTM designation D-3034 SDR 35, type PSM; acrylonitrile- butadiene-styrene (ABS) pipe, ASTM designation D-2661; ductile iron pipe, AWWA designation C-151; or cast iron pipe, AWWA designation C-111. All joints in the pipe and fittings shall be gas-tight and water-tight. The Sewer Inspector may require cast iron or ductile iron pipe be used where the building sewer is in the close vicinity to tree roots or where the building sewer is to be placed in filled or unstable soil. Cast iron or ductile iron pipe shall be used for the building sewer where it is impossible to maintain a ten-foot horizontal and a one and one-half-foot vertical separation from water mains and water service lines.
(B) The size and slope of the building sewers shall be subject to the approval of the Sewer Inspector, but in no event shall the diameter be less than six inches for single-family or duplex residential units and not less than six inches for all other uses. The slope of such six-inch pipe shall be not less than one-fourth inch per foot or sufficient slope to maintain a two feet per second velocity in the sewer.
(Ord. 17-1989, passed 12-5-1989)