(A) The building sewer shall be cast iron soil pipe ASTM Specification (A74) or equal; or vitrified clay sewer pipe, ASTM Specification (C-130) or equal. Polyvinyl chloride (PVC) pipe conforming to ASTM Specifications D-2672, D-2729, D-3033 or D- 3034 with joints conforming to ASTM D-2564 or D-1869 and Acrylonitrile-Butadiene- Styrene (ABS) pipe conforming to ASTM D-2680 with Type SC or OR joints will be acceptable materials. Joints shall be tight and waterproof.
(B) Any part of the building sewer that is located within ten feet of a water service pipe shall be laid in a separate trench and at such an elevation that the top of the sewer is at least 18 inches below the bottom of the water service pipe. If it is impossible to obtain a horizontal separation of at least ten feet, and a vertical separation of at least 18 inches, as stipulated above, the sewer shall be constructed of mechanical or slip-on joint cast-iron pipe, and be pressure tested to assure water tightness.
(C) Cast-iron pipe with leaded joints may be required by the Superintendent where the building sewer is exposed to damage by tree roots.
(D) The size and slope of the building sewer shall be subject to the approval of the Superintendent, but in no event shall the diameter be less than six inches. The slope of such six-inch pipe shall be not less than one foot per 100 feet. For larger sizes of pipe, the minimum slopes shall be according to all state and local regulations. Four-inch diameter building sewer may be used provided that:
(l) A 6x4 reducer is installed at the service connection;
(2) It is installed at a slope of not less than one foot per 100 feet; and
(3) Serves a single-family dwelling. Multiple-housing units, commercial and industrial building sewers shall be not less than six-inch diameter.
(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 any bearing wall if within three feet of such wall, which might thereby be weakened. The depth shall be sufficient to afford protection from frost. The building sewer shall be laid at uniform grade and in straight alignment insofar as possible. Changes in direction or grade shall be allowed only when a proper manhole is constructed at the location of the change.
(F) In all buildings in which any building drain is too low to permit gravity flow to the public sewer, sanitary sewage carried by such drain shall be lifted by approved artificial means and discharged to the building sewer.
(Ord. 75-0-2, passed 4-28-75) Penalty, see § 51.99