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(A) For any user, when the BOD exceeds 250 mg/l, the suspended solids exceeds 250 mg/l, or when other pollutant concentrations exceed the range of concentrations of these pollutants in normal domestic sewage, a surcharge shall be added to the basic charge.
(B) This surcharge shall be calculated by the following formula:
C s = [Bc(B) + Sc(S) = Pc(P)]Vu
(Based on Model 2, 40 CFR 25, Appendix B)
Symbols and definitions:
C c = A surcharge for wastewaters of excessive strength.
B c = O & M cost for treatment of a unit of biochemical oxygen demand (BOD).
B = Concentration of BOD from a user above a base level.
S c = O & M cost for treatment of a unit of suspended solids (SS).
S = Concentration of SS from a user above a base level.
P c = O & M cost for treatment of a unit of any pollutant.
P = Concentration of any pollutant from a user above a base level.
V u = Volume contribution from a user per unit of time.
(`83 Code, § 17-427) (Ord. 87-17, passed 9-8-87)