§ 13.12.150. Industrial waste charges.

A charge will be assessed against persons discharging industrial liquid wastes which are of greater strength and volume than normal, untreated domestic wastewater. Normal untreated domestic wastewater is defined as having a daily flow of two hundred fifty gallons per day and a maximum yearly average BOD not in excess of two hundred twenty milligrams per liter and a maximum yearly average SS not in excess of two hundred fifty milligrams per liter.

The user shall furnish the city documentation of the wastewater flow (water use) for each year. The industrial charge shall be in addition to basic sewer service charges indicated in Section 13.04.100 of this code.

Percentage allocation of basic rate to volume, BOD, and SS is as follows:

Volume	=	57%
BOD	=	23%
SS	=	20%
		100%

 

The industrial user charge shall be calculated using the following mathematical relationship:

Ic = AV + V [B

(BOD-220) 220

+ C

(SS-220) ] 220

 

where,

Ic = Industrial charge per working day

V = Volume of wastewater in 1000 gal/day

A = Cost of treatment per 1000 gal/day of flow = $1.12

B = Cost of treatment per 1000 gal/day of BOD at 220 mg/l = $0.46

C = Cost of treatment per 1000 gal/day of suspended solids at 220 mg/l = $0.39

Basic rate for treatment of normal domestic wastewater = $1.64/1000 gal

If the measured BOD is less than two hundred twenty mg/l and/or the measured SS is less than two hundred twenty mg/l, then in the above equation, the value of BOD will be assumed two hundred twenty mg/l and/or the value of SS will be assumed two hundred twenty mg/l respectively.

(Ord. 1822-2005 § 2(B), 2005: Ord. 1424-92 § 2(part), 1992).