§ 52-4. Industrial surcharge.
When a customer is to be charged an industrial surcharge for overstrength sewerage, the following formula shall be used to compute the monthly bill:
SC = (Q) (8.34) [(a(BOD—250)) + (b(SS—250))(1.20)]
Where:
SC = Surcharge based on excessive concentrations of BOD and/or [suspended solids] (dollars per month) Q = Estimated sewer flow (stated in million gallons per year divided by 12 months equals million gallons per month) or actual meter flow if metered (a) = Monthly adjusted unit cost of treatment, chargeable to BOD (dollars per pound of BOD introduced to system) (b) = Monthly adjusted unit cost of treatment, chargeable to SS (dollars per pound of SS introduced to system) EXAMPLE OF FORMULA
a.
Water consumption per year = 80,000 gallons ('000)
b.
BOD = 700
c.
SS = 1,000
d.
Treatment cost for BOD and SS = $0.02 per pound (for this example only)
e.
Estimated sewer flow = 80,000,000 — 10 percent or 72,000,000 gallons per year divided by 12 months = 6 million gallons
f.
SC = Q (8.34) [((a(BOD—250)) + (b(SS—250))(1.20)]
SC = 6(8.34) [((.02(700—250)) + (.02(1,000—250)))(1.20)]
SC = 50.04 [(($.02(450)) + ($.02 (750)))(1.20)]
SC = 50.04 [$9. + $15.](1.20)
SC = 50.04 ($24.)(1.20)
SC = $1,441.15 per month.
(Ord. No. 4211, § 1, 9-22-83; Ord. No. 2018-10098, § 1, 9-20-18 )
Cross reference
Industrial surcharge for class groups, § 41-23.1.