(a) As provided in Section 933.14(a) surcharges shall be assessed for extra-strength wastewater for which the concentration of BOD, suspended solids or other pollutants exceeds the concentration of these pollutants in normal strength wastewater.
Surcharges shall also be assessed for the City's cost of consistently removing at the City's wastewater treatment facilities toxic pollutants as defined in the categorical standards and amendments thereto.
(b) Wastewater pollutant concentrations shall be determined from the City's pretreatment compliance monitoring program and any necessary special surveillance, user's self- monitoring data and/or EPA compliance monitoring data.
(c) As required by Federal law, surcharges shall be added to a user's sewer use charges and shall remain in effect as long as normal strength wastewater values are exceeded.
(d) Consistent with the Act, surcharges shall be computed in accordance with the model below:
Cs = K(BcB+ ScS + PcP) Vu
where
Cs = Surcharge for extra-strength waste
K = concentration to mass loading conversion factor equal to .0626
Bc = unit operating cost for biochemical oxygen demand (BOD) in $/lb.
B = concentration (mg/l) of BOD from a user above 250 mg/l (normal strength wastewater)
Sc = unit operating cost for suspended solids (nonfilterable residue) in $/lb.
S = concentration (mg/l) of suspended solids from a user above 300 mg/l (normal strength wastewater)
Pc = unit operating cost of any pollutant in $/lb.
P = concentration (mg/l) of any pollutant from a user above normal strength wastewater concentration.
Vu = a user's total water usage or wastewater discharge in 100 cubic feet per unit of time.
(Ord. 87-8399. Passed 2-18-87.)