(A) Liability for surcharge. Each industrial or nonindustrial user who discharges wastes into the sewerage system shall be subject to a surcharge, in addition to the regular sewer charges, based on both the biochemical oxygen demand (or on the chemical oxygen demand where B.O.D. cannot be determined) and the suspended solids content of the wastes, if these wastes have a concentration greater than the following:
(1) A biochemical oxygen demand of 250 milligrams per liter; or where B.O.D. cannot be determined, then, in lieu of B.O.D., a chemical oxygen/demand of 400 milligrams per liter;
(2) A suspended solids content of 250 milligrams per liter.
(B) Computation of surcharge. The surcharge shall be determined as follows: The excess pounds of B.O.D. (or C.O.D.) and of suspended solids will each be computed by first multiplying the customer's billing sewage volume measured in units of 100 cubic feet for the current billing period by the factor 0.0062321 and then multiplying this product by the difference between the concentrations measured in milligrams per liter of the B.O.D. (or C.O.D.) and of the suspended solids respectively in the customer's sewage and the allowed concentrations set out in division (A). The surcharge for each constituent will then be determined by multiplying the excess pounds of each constituent by the appropriate rate of surcharge set out in division (C).
(C) Rates of surcharge. The rates of surcharge for each of the aforementioned constituents shall be as follows:
Constituents | Per Pound |
For Biochemical Oxygen Demand (B.O.D.) | $0.12 |
For Chemical Oxygen Demand (C.O.D) where B.O.D. cannot be determined | $0.12 |
For Suspended Solids | $0.12 |
(D) Revision of rates of surcharge. Prior to May 1 of each year, the Clerk-Treasurer shall submit to the Board of Public Works and Safety a comparison of the calculated unit costs for removing B.O.D. and suspended solids from the wastewater treatment plant influent during the previous calendar year with the unit charges currently in effect in order that the Board may determine whether the current rate of surcharge are adequate or should be changed by the Common Council.
(Ord. 2-2007, passed 1-23-2007)