(a) The surcharge shall be based on four constituents of the water or wastes applicable:
(1) Total Suspended Solids
(2) BOD
(3) COD
(4) Phosphorus
(b) Whenever the wastes are ruled acceptable to wastewater treatment and the wastewater contains suspended solids, BOD, and/or COD, or phosphorus in excess of "normal sewage", the excess shall be subjected to surcharge derived in accordance with the following formulae:
(1) SCS = (TSS-280) x F X 8.34 x CS
SCS = Surcharge due to total suspended solids.
TSS = Total suspended solids in wastes as discharged in mg/1
280 = Suspended solids concentration in "normal sewage" in mg/1
F = Flow in millions of gallons per day of wastes as discharged.
CS = Cost to treat one pound of suspended solids in cents per day per pound.
(2) SCB = (BOD-240) x F x 8.34 x CB
SCB = Surcharge due to excess BOD
BOD = Total BOD in wastes as discharged in mg/1.
240 = BOD concentration in "normal sewage" in mg/1.
CB = Cost to treat one pound of BOD in cents per pound per day.
Or
SCC = (COD-500) x F x 8.34 x CC
SCC = Surcharge due to excess COD
COD = Total COD in wastes as discharged in mg/1.
500 = COD concentration in "normal sewage" in mg/1.
CC = Cost to treat one pound of COD in cents per pound per day.
(3) SCP = (P-8) X 8.34 X F X CP
SCP = Surcharge due to excess phosphorus.
P = Total phosphorus in wastes as discharged in mg/1.
8 = Total phosphorus concentration in "normal sewage" in mg/1.
F = Flow in millions of gallons per day.
CP = Cost to treat one pound of phosphorus in cents per pound per day.
(Ord. 30-14. Passed 3-3-14.)