§ 10.04.10. Pretreatment.

Users shall provide necessary wastewater treatment as required to comply with this chapter and shall achieve compliance with all national categorical pretreatment standards within the time limitations as specified by the federal pretreatment regulations. Any facilities required to pretreat wastewater shall be provided, operated, and maintained at the user's expense. Detailed plans showing the pretreatment facilities and operating procedures shall be submitted to the superintendent for review, and shall be acceptable to the superintendent before construction of the facility. The review of such plans and operating procedures will in no way relieve the user from the responsibility of modifying the facility as necessary to produce an effluent acceptable to the superintendent under the provisions of this chapter. Any subsequent changes in the pretreatment facilities or method of operation shall be reported to and be acceptable to the superintendent prior to the user's initiation of the changes.

All records relating to compliance with pretreatment standards shall be made available by the superintendent upon request.

Any users subject to a national categorical pretreatment standard, after the compliance date of such pretreatment standard, or, in the case of the commencement of a new discharge to the wastewater disposal system, shall submit to the superintendent a report indicating the nature and concentration of pollutants in the effluent which are limited by such pretreatment standards.

In addition, this report shall include a record of all daily flows which during the reporting period exceeded the average daily flow reported in section 10.04.06 or 10.04.07.B.

In the event the city should elect to accept an industrial waste, without pretreatment, which exceeds the limits set forth in section 10.04.02.M. with regard to BOD and suspended solids; a substantial prepayment, subject to negotiation, of the city's capital investment in sewage treatment facilities shall be required. In addition, a surcharge shall be added to the normal rates for sewer service as established by ordinance in accordance with the following formula:

IUS - V[A (BOD-250) + B (SS-250)]

where the following definitions apply:

IUS = industrial user surcharge

V = volume of discharge in million gallons

A = BOD surcharge factor in dollars per million gallons per mg/l

B = suspended solids surcharge factor, in dollars per million gallons per mg/l

The value of each of the factors "A" and "B" shall be determined annually as the capitalized annual cost of removal of BOD and SS at the sewage treatment plant after considering the cost of operation and maintenance, sinking fund, chemicals, power depreciation, repairs, overhead, and all other costs attributable thereto. The method of calculation shall be in accordance with federal guidelines pertaining to this subject.

The prepayment of capital and industrial user surcharge shall not apply to flows of twenty-five thousand (25,000) gallons per day or less with BOD and SS concentrations of two hundred fifty (250) mg/l or less. For discharges having BOD and SS concentrations greater than two hundred fifty (250) mg/l, the flow rate shall be prorated accordingly to calculate a flow equivalent to twenty-five thousand (25,000) gallons per day which shall be exempt from the capital prepayments and surcharge requirements.

( Ord. No. 94-27, § 4.05 )