(A) Surcharge calculations shall be based on monthly average concentrations. The following formula shall be used in computing a user's surcharge bill:
SC = 8.34 x Qx[(CBOD5 - 250) x ($CBOD5) + (TSS - 250) x ($TSS) + (TP-4) x (TP) + (NH3 - 15)
x ($NH3)] + Cex
(B) Definitions for Surcharge Calculations.
SC = Total Surcharge
8.34 =A constant to convert mg/l to pounds.
Q = Industrial waste flow expressed in million gallons.
CBOD5 = 5-day CBOB5 in mg/l of the industrial waste.
$CBOD5 = Surcharge rate for CBOB5 expressed as dollars per 100 pounds of CBOB5.
TSS = Total suspended solids in mg/l of the industrial waste.
$TSS = Surcharge rate for total suspended solids expressed as dollars per pound of TSS.
250, 250, 4, 15 =The CBOD5, TSS, TP and Ammonia-Nitrogen surcharge thresholds as specified in § 51.012.
TP = Total Phosphorus in mg/l of the industrial waste.
$TP = Surcharge rate for total phosphorus expressed as dollars per pound of TP.
Cex =Extra costs incurred to the city incident to the supervision, inspection, sampling, and analyzing of wastes as set forth shall be included in the surcharge made to users discharging wastes into the WWTP.
NH3 = Ammonia in mg/l of the industrial waste.
$NH3 = Surcharge rate for ammonia expressed as dollars per 100 pounds of NH3-N.
(Ord. 1994-79, passed 11-21-94; Am. Ord. 1995-57, passed 9-11-95; Am. Ord. 2001-10, passed 1-16-01)