(a) (1) All persons discharging industrial wastes into the City sewers shall be subjected to a surcharge, in addition to any other sewer service charges, if these wastes have a concentration greater than those established as being the average residential waste, discharge in the City sewer service area in Section 921.02(c).
(2) The amount of surcharge shall reflect the cost incurred by the City in removing excess contributions of BOD and SS. This surcharge shall include a proportionate share of the fixed charges and amortization costs for the wastewater treatment facilities based on an established plant life of thirty years or at the end of major construction periods, whichever is shorter, and the annual cost of O&M (including replacement) of the treatment facilities.
(b) The excess pounds of BOD and SS shall be computed by multiplying the person's sewage flow volume in million gallons per day by the constant 8.345 and then multiplying this product by the difference between the persons' concentration of BOD and SS and the aforementioned average residential waste discharge in milligrams per liter. The surcharge for each constituent shall then be determined by multiplying the excess pounds of each constituent by the appropriate rate of surcharge listed in subsection (c) hereof. This product will then be multiplied by the number of days in the billing period to determine the surcharge. Concentration figures in the above calculations shall be daily averages determined in accordance with the provisions of Section 921.10.
(c) The rates of surcharge for each of the aforementioned constituents shall be as follows:
To be determined in accordance with the provisions of this chapter at the time of admission of an industrial user to the wastewater facilities; shall be based on the volume of flow and contribution of constituents (BOD, SS and others) of each industry.
(d) The rates of surcharge shall be reviewed annually by the Approving Authority in order to determine whether or not they are sufficient to defray the fixed charges, amortization costs, and annual cost of operation and maintenance (including replacement) as determined from the wastewater treatment facilities records. If the difference between the revenue derived from the rates of surcharge and the total annual cost is sufficient to justify an increase or decrease in the rates, the Approving Authority shall make such recommendation as is appropriate to Council. (Ord. 1350. Passed 11-16-78.)