All building sewers shall be constructed, laid and connected according to the following standards. The following standards are able to be adjusted in writing by the City Engineer or their designee:
(a) The building sewer shall be cast iron soil pipe. ANSI specification (A21.6) or equal; vitrified clay sewer pipe, ASTM specification (C700) or equal, of PVC pipe, ASTM (D3034), or other suitable material approved by the City Engineer or designee. Joints shall be tight and waterproof. No building sewer shall be laid in the same excavation with a water service pipe. Any part of the building sewer that is located within six feet of a water service pipe shall be constructed of cast iron soil pipe with rubber-gasket joints. Cast iron pipe with rubber-gasket joints may be required by the City Engineer or designee where the building sewer is exposed to damage by tree roots. If installed in filled or unstable ground, the building sewer shall be of cast iron soil pipe, except that nonmetallic material may be accepted if laid on a suitable bed as approved by the City Engineer or designee.
(b) The size and slope of the building sewer shall be subject to the approval of the City Engineer or designee, 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-eighth inch per foot.
(c) 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. Changes in direction shall be made only with properly curved pipe and fittings.
(d) In all buildings in which any building drain is too low to permit gravity flow to the public sewer, sanitary sewage carried by such a drain shall be lifted by approved artificial means and discharged to the building sewer.
(e) All excavations required for the installation of a building sewer shall be open trench work unless otherwise approved by the City Engineer or designee. Pipe laying and backfill shall be performed in accordance with the requirements of the Building and Plumbing Codes and other applicable rules and regulations of the City. In the absence of code provisions or in the amplifications thereof, the materials set forth in the appropriate ASTM and ANSI specifications and the procedures set forth in the WPCF Manual of Practice No. 9 shall apply. No backfill shall be placed until the work has been inspected.
(f) All joints and connections shall be made gastight and watertight.
(1) Cast-iron pipe joints shall be rubber-gasket joints as defined by ANSI specifications A 21.11.
(2) All joints in vitrified clay bell and spigot pipe shall be compression joints as defined by ASTM Designation: C-425. Joints are to be firmly attached to the bell and spigot ends of the sewer pipe at the place of manufacture.
(3) Other jointing materials and methods may be used only by approval of the City Engineer or designee.
(g) The connection of the building sewer into the public sewer shall be made by the wye branch, if such branch is available at a suitable location. If the public sewer is twelve 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 or designee. Where the public sewer is greater than twelve 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 forty-five degrees. A forty-five-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 invert of the building sewer at the point of connection shall be at the same or at a higher elevation than the invert of the public sewer. A smooth, neat joint shall be made, and the connection made secure and watertight by encasement in concrete. Special fittings may be used for the connection only when approved by the City Engineer or designee. If an existing sewer lateral branch is available, it shall be televised at the owner's expense, and the owner shall provide video of said sewer lateral branch to the City Engineer or designee for review prior to connection.
(h) The demolition of any structure shall include the abandonment of any existing sewer service lateral.
(i) Prior to the abandonment of any existing sewer service lateral, the owner shall obtain a permit for abandoning such sewer service lateral from the City Engineer or designee. Any existing sewer service lateral shall be abandoned in accordance with the following requirements and at the owner's expense.
(1) The sewer service lateral shall be televised from the structure to the main, and the owner shall provide video and data of said sewer service lateral to the City Engineer or designee for review. Should a blind connection to the sewer service lateral exist, tracing must be completed to ensure all sewer laterals are no longer in service prior to abandonment.
(2) Sewer service laterals upstream of a blind connection will be abandoned per City Standards, and a cleanout shall be performed at the point of connection.
(3) Sewer service laterals shall be abandoned per City Standards behind the curb line, or outside the edge of the pavement, or at the right of way line, per the City Engineer or designee and any existing cleanout shall be removed.
(j) The property owner shall have the responsibility for maintenance and repair of the service lateral from the main including the wye to the building structure. (Ord. 89-2021. Passed 6-21-21.)