The connection of the building sewer into the public sewer shall conform to the requirements of the National Building Code and Plumbing Code of the state, or other applicable rules and regulations adopted by the city, or the procedures set forth in appropriate specifications of the A.S.T.M. and the W.P.C.F. Manual of Practice No. 9. All such connections shall be made gas-tight and water-tight. Any deviation from the prescribed procedures and materials must be approved by the Superintendent before installation.
(1975 Code, § 38.48)