§ 154-278. Industrial wastewater surcharges.

(a)

Established. All persons discharging industrial wastes into the public sewers shall be charged and assessed a surcharge, in addition to any sewer service charges, if these wastes have a concentration greater than the following:

(1)

A COD content of 500 mg/l as determined by laboratory analysis in accordance with procedures prescribed in section 154-282, subparagraph (b).

(2)

A TSS content of 250 mg/l as determined by laboratory analysis in accordance with procedures prescribed in sections 154-282, subparagraph (b).

(3)

A TKN content of 25 mg/l as determined by a laboratory analysis in accordance with procedures prescribed in section 154-282, subparagraph (b).

The amount of the surcharge, which is hereby charged and assessed against all persons discharging industrial wastewater into the public sewers, shall reflect the cost incurred by the city in handling the excess COD, TKN, and TSS. This surcharge shall include a proportionate share of charges for maintenance and operation of the water pollution control facilities including depreciation and other incidental expenses.

(b)

Formula determining surcharge. When any or all the COD, TKN, and TSS of wastewater or waste accepted for admission to the city water pollution control facilities exceed values of these constituents set forth in subparagraph (a) hereof, the excess concentrations of any or all, as the case may be, shall be evaluated in terms of these values and be subject to a surcharge on the amount derived in accordance with the following formula: Amount of surcharge = (B + C + D) × effluent flow (CCF)

Where:

B	=	The cost factor for TSS discharged to the sewer above 250 mg/l. This quantity is determined by the multiplication of a factor herein called "X", by the excessive pounds of TSS in the wastewater as measured in samples collected so as to be representative of the daily wastewater discharge.
C	=	The cost factor for COD discharged to the sewer above 500 mg/l. This quantity is determined by the multiplication of a factor herein called "Y", by the excessive pounds of COD in the wastewater as measured in samples collected so as to be representative of the daily wastewater discharge.
D	=	The cost factor for TKN discharged to the sewer above 25 mg/l. This quantity is determined by the multiplication of a factor herein called "Z", by the excessive pounds of TKN in the wastewater as measured in samples collected so as to be representative of the daily wastewater discharge.
X	=	The annual average cost of removal of one pound of TSS.
Y	=	The annual average cost of removal of one pound of COD.
Z	=	The annual average cost of removal of one pound of TKN.

 

(c)

Determination of amounts. The rates of surcharge for each of the aforementioned constituents shall be determined annually by the commissioner in order that the above factors may correctly represent current treatment costs. A schedule of the surcharge shall be filed with the municipal clerk by the commissioner.

(d)

Changing industrial wastewater surcharge. The industrial waste surcharge cost factors shall not be increased in any year by more than 20 percent of the charges for the preceding year without written approval of the city council.

(Ord. No. 1998-71, § 2, 10-13-98)