§ 13.52.060. Size, slope and depth.

No basement, half basement, or any other portion of a building having a floor at an elevation beneath any ground surface immediately adjacent to the building may contain any fixture or drain connected in such a manner as to discharge sewage by gravity into the public sewer. In areas where the ground surface over the building sewer is to be altered, the final ground elevation shall be utilized. The maximum depth to the top of a building sewer shall be 3.5 feet below finished grade at the point where it enters the building which it serves. In all buildings in which the elevation of a drain or fixture is too low to provide flow by gravity to the public sewer, all sewage collected or carried by such drain or fixture shall be lifted by approved mechanical ejector pump and discharged into the building sewer. No water operated sewage ejector shall be used. The size and slope of the building sewers shall be subject to the approval of the superintendent, but in no event shall the diameter be less than six inches. The slope of the pipe shall not be less than one-eighth of an inch per foot. 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 a uniform grade and in straight alignment insofar as possible. Changes in direction or grade shall be allowed only with a properly curved pipe and fittings.

(Ord. 1999-10 § 1, 1999)