(A)   (1)   The building sewer shall be constructed of either of the following types of pipe meeting the current ASTM specifications:
         (a)   Plastic (ABS) ASTM D 1527 SDR 35;
         (b)   Plastic (PVC) ASTM D 1785 SDR 35;
         (c)   Asbestos-Cement (AC) ASTM C-428 C1-2400;
         (d)   Cast Iron Extra Heavy ASTM A-74; or
         (e)   Non-reinforced concrete ASTM C-14 Extra Strength.
      (2)   If installed in filled or unstable ground, the building sewer shall be of cast iron extra heavy pipe, except that other types of pipe may be used if laid on a suitable improved bed or cradle as approved by the Inspector.
   (B)   All building sewer joints and connections shall be made gas tight and water tight and shall conform to the requirements of the current building and plumbing codes. Asbestos cement or concrete sewer pipe joints shall be of rubber ring, flexible compression type, similar and equal to joints specified for vitrified clay pipe. The joints and connections shall conform to the manufacturer’s recommendations.
   (C)   The size and slope of the building sewer shall be subject to the approval of the Inspector, but in no event shall the diameter be less than four inches. Minimum grade shall be as follows:
      (1)   Six-inch pipe: one-eighth inch per foot or one inch per eight feet: 1%; and
      (2)   Four-inch pipe: one-fourth inch per foot or two inches per eight feet: 2%.
   (D)   Whenever possible, the building sewer shall be brought to the buildings 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. All excavations required for the installation of a building sewer shall be open trench work unless otherwise approved by the Inspector. Pipe laying and backfill shall be performed in accordance with current ASTM specifications, except that no backfill shall be placed until the work has been inspected by the Inspector or his or her representative.
   (E)   In all buildings in which any building drain is too low to permit gravity flow to the public sewer, sanitary sewage carried by the drains shall be lifted by artificial means and discharged to the building sewer, subject to approval by the Inspector
   (F)   The connection of the building sewer into the public sewer shall be made at the wye branch designated for the property if the branch is available at a suitable location. Any connection not made at the designated wye branch in the main sewer shall be made only as directed by the Inspector.
(Ord. passed 4-24-1995)  Penalty, see § 51.999