The surcharge for operation and maintenance for wastewater and with more than 225 mg/l of BOD and 200 mg/l of suspended solids shall be as follows:
The surcharge formula:
SC = [Rp (Pi - Pn) + Rs (Si - Sn) + Rx
(Xi - Xn) × 8.34 × V
as described would be used to determine this “extra charge” based upon laboratory analysis of the wastewater as selected time periods to be determined for each industry involved.
Where:
SC = Surcharge, in dollars
Rp = Unit BOD cost of treating normal sewage, $0.1449 per pound
Pi = BOD in the industrial waste, ppm
Pn = BOD in normal sewage, ppm (225)
Rs = Unit suspended solids cost of treating normal sewage, $0.1475 per pound
Si = Suspended solids in the industrial waste, ppm
Sn = Suspended solids in normal sewage, ppm (200)
Rx = Unit cost of treating any additional substance in the industrial waste, in dollars per pound
Xi = Substance requiring additional treatment in the industrial waste, ppm
Xn = Substance requiring additional treatment in normal sewage, ppm
8.34 = lb/million gallon-mg/l
V = Wastewater volume, million gallon
(Ord. 2090, § 1, passed 3-26-1979; Ord. 2113, § 1, passed 12-10-1979)