(A) Separate building sewers. A separate and independent building sewer shall be provided for every building and in the case of residential property, one living unit, unless otherwise authorized by the City Engineer. Old building sewers may be used in connection with new buildings only when they are found, on examination and test by the Public Works Department, to meet all requirements of this section.
(B) Connection to public sewer. The connection of the building sewer into the public sewer shall be made at the wye branch, if such branch is available at a suitable location. If the public sewer is 12 inches in diameter or less, and no properly located wye branch is available, the owner shall at his expense install a wye branch in the public sewer at the location specified by the City Engineer. Where the public sewer is greater than 12 inches in diameter, and no properly located wye branch is available, a neat hole may be cut into the public sewer to receive the building sewer, with entry in the downstream direction at an angle of about 45 degrees. A 45-degree ell may be used to make such connection with the spigot end cut so as not to extend past the inner surface of the public sewer. The 0.8 point of the building sewer at the point of connection shall be at the 0.8 point or at a higher elevation than the public sewer. A smooth, neat joint shall be made, and the connection made secure and watertight by engagement in concrete. Special fittings may be used for the connection only when approved by the City Engineer. No portion of the building service shall extend into the public sewer.
(C) Excavations. All excavations required for the installation of a building sewer shall be open trench work unless otherwise approved by the City Engineer. Tunneling may be permitted but no tunnel shall exceed six feet in length and the pipe shall be installed so as to permit inspection of all joints. No backfill shall be placed until work has been inspected by the city. All excavations for building sewer installation shall be adequately guarded with barricades and lights so as to protect the public from hazard. Streets, sidewalks, parkways and other public property disturbed in the course of the work shall be restored in a manner satisfactory to the City Engineer.
(D) Inspection, connection to public sewer. The applicant for the building sewer permit shall notify the Public Works Department when the building sewer is ready for inspection and connection to the public sewer. The connection shall be made under the supervision of the City Engineer or his representative. Abandonment of existing sanitary storm sewer services shall be made in accordance with the requirements of the City Engineer.
(E) Minimum parcel size. No building sewer or connection to the city sanitary sewer system shall be permitted or made from any building or structure located on a lot, piece or parcel of land or several lots, pieces or parcels of land having a total width less than that permitted by zoning ordinance.
(F) Specifications. In addition to the specifications as established by the City Engineer, the following requirements shall be complied with:
(1) Building sewers shall be of extra heavy duty cast iron pipe, or PVC conforming to ASTM D-3034, SDR-35. Minimum size of building sewer shall be 4-inch extra heavy cast iron pipe. Change in direction of building sewer shall be made by use of fittings approved by the plumbing inspector and/or the Engineering Department.
(2) Type of joints shall comply with the following specifications: Cast iron shall be a push-on or mechanical type. Polyvinyl Chloride pipe shall be bell and spigot with an elastomeric O ring gasket in accordance with ASTM F477.
(3) Ductile iron pipe may be required by the City Engineer where the building sewer is installed in filled or unstable ground.
(4) Existing cesspools and septic tanks shall be removed and/or suitably filled, as approved by the City Engineer.
(5) 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. The building sewer shall be laid at uniform grade and in straight alignment insofar as possible.
(6) 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.
(7) All joints and connections shall be made gastight and watertight.
(8) O ring joints shall be installed in accordance with manufacturers' recommendations, and backfilling shall not occur until the joints have been tested and approved by the city.
(9) Other jointing materials and methods may be used only by approval of the City Engineer.
(Ord. 1227, passed 8-26-91) Penalty, see § 4.408