(A) Building sewers shall not be less than six inch diameter size pipe installed at a minimum invert slope of one-eighth inch per foot, or not less than four inch diameter size pipe in lengths of not less than ten feet installed at a minimum invert slope of one-fourth inch per foot. Building sewers shall be constructed in accordance with the requirements of the Superintendent as to trench excavation and backfilling, installation of pipe and fittings and testing.
(B) Building sewers shall be constructed using one of the following listed materials:
(1) Extra strength vitrified clay pipe and fittings conforming to the latest revision of ASTM Specification C700 with compression type joints conforming to the latest revision of ASTM Specification C425, installed in accordance with the latest revision of ASTM Standard C12.
(2) Acrylonitrile-butadiene-styrene (ABS) sewer pipe and fittings with solvent welded joints or compression type rubber ring gasket joints conforming to the latest revision of ASTM Specification D2751 installed in accordance with the manufacturer's recommendations.
(3) Polyvinyl chloride (PVC) Type PSM sewer pipe and fittings, SDR 35, with compression type rubber ring gaskets and coupling joints conforming to the latest revision of ASTM Specification D3034, installed in accordance with the manufacturer's recommendations.
(4) Cast iron soil pipe and fittings conforming to the latest revision of CISPI Specification HS-67 with compression type rubber ring gasket joints, conforming to the latest revision of ASTM Specifications C564, installed in accordance with the latest revision of the State Plumbing Code.
(C) The connection of the building sewer into the public sewer shall be made at the branch fitting, if such is available at a suitable location. If the public sewer is 12 inches in diameter or less, and no properly located branch fitting is available, the owner shall, at his expense, install a branch fitting in the public sewer at the location specified and installation approved by the Superintendent.
(D) All building sewers shall be bedded on a layer of gravel or crushed stone, Size #67, conforming to the latest revision of ASTM Specifications D448, to provide a minimum thickness of four inches under and supporting the full bottom quadrant of the pipe. Backfill materials shall be placed and tamped by hand in six inch layers around the pipe to a height of 12 inches over the top of pipe.
(E) Whenever possible, the building sewer shall be brought to the building at an elevation below the basement floor. No building sewer shall be laid parallel to or within three feet of any bearing wall which might thereby be weakened. The depth shall be sufficient to afford protection from frost. In all buildings in which any building drain is too low to permit gravity flow to the public sewer, sewage carried by such drains shall be lifted by approved pumping devices and discharged to the building sewer.
(Ord. 583-85, passed 5-14-85)