Sewer customers or others discharging wastes to the sanitary sewer system which do not exceed the limits established in section 13.04.092 hereof and which do not exhibit any of the characteristics of wastes prohibited by section 13.04.091 hereof but have concentration(s) in excess of “normal domestic sewage,” shall pretreat the waste to meet the concentrations of “normal domestic sewage”; however, such excessive BOD and TSS wastes may be accepted for treatment if all of the following requirements are met:
(1) 
The wastes will not cause damage to the wastewater collection system;
(2) 
The wastes will not impair the city’s treatments process;
(3) 
The wastes will not cause contamination of POTW (publicly owned treatment works) sludges thus limiting sludge disposal options or practices;
(4) 
The person(s)or owner(s) responsible for the wastes pays a surcharge, in addition to the regular water and sewer rates, in accordance with the following costs factors and formula:
V = Volume reported in millions of gallons (MG).
BOD = Biochemical oxygen demand analyzed in accordance with the latest edition of “Standards Methods for the Examination of Water and Wastewater,” or the latest EPA approved method, and reported in units of milligrams per liter (mg/l).
TSS = Total suspended solids analyzed in accordance with the latest edition of “Standard Methods for the Examination of Water of Wastewater” or the latest EPA approved method, and reported in the units of milligrams per liter (mg/l).
Cost factor BOD = 55% of the total budget costs for operating and maintaining the waste water treatment facilities divided by total pounds BOD treated.
Cost factor TSS = 45% of the total budgeted costs for operating and maintaining the wastewater treatment facilities divided by total pounds TSS treated.
Surcharge = Surcharge computed in dollars as follows:
BOD surcharge = Vx (B-C) x 8.34 x cost factor BOD.
TSS surcharge = Vx (B-C) x .8.34 x cost factor TSS.
Where:
B = Total contribution from user (mg/l).
C = Normal domestic sewage strength (two hundred fifty (250) mg/l).
8.34 = Pounds per gallon of water (consersion).
The surcharge rate for sewer service as shown above, shall be determined each year following city council approval of the annual operations budget. The surcharge rate shall be examined by the city administrator, or his designee, and such adjustments shall be made to the sewer surcharge annually.
(Ordinance 080805, pt. 2, adopted 8/8/05)