§ 58-226. Strength-of-wastes surcharge.

(a)

Liability. Each industrial or nonindustrial user who discharges wastes into the sewerage system shall be subject to a surcharge, in addition to the regular sewer charges, based on both the biochemical oxygen demand, or on the COD where the BOD cannot be determined, and the suspended solids content of the wastes, if the wastes have a concentration greater than the following:

(1)

A BOD of 250 milligrams per liter, or where the BOD cannot be determined, then, in lieu thereof, a COD of 400 milligrams per liter.

(2)

A suspended solids content of 250 milligrams per liter.

(b)

Computation. The surcharge shall be determined by computing the excess pounds of the BOD or COD and of suspended solids by first multiplying the customer's billing sewage volume, measured in units of 100 cubic feet, for the current billing period, by the factor 0.0062321, and then multiplying such product by the difference between the concentrations measured in milligrams per liter of the BOD or COD and of the suspended solids, respectively, in the customer's sewage and the allowed concentrations set forth in subsection (a) of this section. The surcharge for each constituent will then be determined by multiplying the excess pounds of each constituent by the appropriate rate of surcharge set forth in subsection (c) of this section.

(c)

Rates established. The rate of surcharge for each of the constituents set forth in subsection (b) of this section shall be as follows:

Strength of Waste Surcharge	Inside City (cents per pound)	Outside City (cents per pound)
BOD/COD	$20.77	$25.97
Suspended solids	16.03	20.03

 

(d)

Revisions. Prior to May 1 of each year, the superintendent of utilities shall submit to the utility service board a comparison of the calculated unit costs for removing BOD and suspended solids from the wastewater treatment plant influent during the previous calendar year within the unit charges currently in effect, in order that the board may determine whether the current rates of surcharges are adequate or should be changed by the common council.

(Code 1974, § 14-165; Ord. No. 2008-04, § 1, 3-3-2008)