The following regulations shall govern the installation of all sanitary connections within the city or along any sewers leading to the city sewer system.
(A) Only one service line connection to the city’s sanitary sewage collection system is permitted for each residence or commercial building. The connection point will be as approved by the Superintendent.
(B) Only the following types of pipe and fitting materials are approved for constructing service lines. Pipe and fittings in each individual service line shall be of identical material:
(1) Vitrified clay pipe conforming to ASTM Specification C700 with joint coupling conforming to ASTM Specification C425 and installed according to ASTM C12;
(2) Cast iron soil pipe, standard weight, conforming to ASTM Specification A74 with rubber gasket joint coupling conforming to ASTM Specification C564;
(3) Poly-vinyl-chloride PSM (PVC) pipe conforming to ASTM Specification D30.34 and Installed according to ASTM D2321;
(4) Ductile iron pipe conforming to ANSI A21-51 with rubber gasket joints ANSI A21.ll, and Installed according to manufacturer’s recommendations; and
(5) Acrylonltrile-butadiene-styrene (ABS) pipe, material conforming to ASTM Specification D2751.
(C) Minimum sizes of service lines shall be as follows:
(1) Residential: four inches in diameter; and
(2) Commercial: six inches in diameter.
(D) Minimum grades for service lines shall be as follows:
(1) Four-inch pipe: one foot drop per 100 feet (1%);
(2) Six-inch pipe: six-inch drop per 100 feet (0.5%); and
(3) Eight-inch pipe: four-inch drop per 100 feet (0.33%).
(E) Maximum grades for service lines shall be as follows:
(1) Four-inch pipe: two and one-half feet drop per hundred feet (2.5%);
(2) Six-inch pipe: one and one-half feet drop per hundred feet (1.5%); and
(3) Eight-inch pipe: one foot drop per hundred feet (1%).
(F) Service lines shall be constructed to true alignment and grade. Warped and sagging lines will not be permitted.
(G) (1) The building tie-on connection shall be made directly to the building drain on all waste outlets. Water-tight adapters of a type compatible with the materials being joined shall be used at the point of connection of the service line to the building plumbing. No cement grout materials are permitted.
(2) Existing “wye” and stack connections must be utilized for connection of the service line to the sewer main unless an exception is permitted by the Superintendent.
(H) Fittings and cleanouts for service lines shall be as follows.
(1) No bends or turns at any point shall be greater than 45 degrees.
(2) Each horizontal service line shall be provided with a cleanout at its upper terminal; and each run of piping which is more than 90 feet in length shall be provided with a cleanout for each 90 feet or fraction thereof, in length of the piping.
(3) Each cleanout shall be installed so that it opens in a direction opposite to the flow of the waste and, except in the case of “wye” branch and end-of-the-line cleanouts, cleanouts shall be installed vertically above the flow line of the pipe.
(4) Each cleanout shall be made with an air-tight mechanical plug.
(I) The city may require a check valve on the privately constructed portion of the service line if, in the opinion of the city, the property is subject to damage from overcharged city sewers.
(Ord. passed 8-20-1985)