All building sewers shall be brought to the building at an elevation below the lowest floor level having sanitary facilities.  In all buildings in which any building drain is below a point which will permit a minimum average slope of the building sewer of one foot per 100-feet above the top of the street sewer, wastewater carried by such building sewer shall be lifted by pumping units or other approved means and discharged through a building sewer having the minimum average slope.
(Ord., passed 7-28-83)  Penalty, see § 50.999