(a) Normal Concentrations. All persons discharging industrial wastes into the public sewers shall be subject to a surcharge, in addition to any other sewer service charges, if such wastes have a concentration greater than the following normal concentrations:
(1) A five-day, twenty degree Centigrade biochemical oxygen demand (BOD) of 200 parts per million;
(2) A suspended solids content of 250 parts per million;
(3) An oil/grease content of 100 parts per million; or
(4) A chlorine requirement of fifty parts per million.
(b) Items Contained in Surcharge. The amount of the surcharge shall reflect the cost incurred by the City in removing the excess biochemical oxygen demand (BOD), suspended solids and oil/grease and in satisfying the excess chlorine requirement of the waste load. This surcharge shall include a proportionate share of the following:
(1) Fixed charges and amortization costs for the sewage disposal works based upon an average useful life of twenty-five years and an annual interest rate of five percent, and under the assumption that the capital investment will be retired at a uniform rate throughout the life of the facilities. Such basis of fixed charges shall be recalculated each five years or at the end of major construction periods, whichever is shorter.
(2) The annual cost of operation of the sewage treatment plant, including repairs and maintenance, and the cost of administering this chapter.
(Ord. 2000-220. Passed 10-16-00.)