§ 10.04.03. Limitations on wastewater strength.

A.

National categorical pretreatment standards. National categorical pretreatment standards promulgated by the U.S. Environmental Protection Agency (EPA) pursuant to the Act shall be met by all users which are subject to such standards in any instance where they are more stringent than the limitations in this chapter unless the superintendent has applied for and obtained from the state department of pollution control and ecology approval to modify the specific limits in the national categorical pretreatment standards. When requested, an application for modification of the national categorical pretreatment standards will be considered for submittal by the superintendent when the city's wastewater treatment system achieves consistent removal of the pollutants. "Consistent removal" shall be defined as in 40 CFR 403.7(a)(1) of the "General Pretreatment Regulations for Existing and New Sources of Pollution." Conditional revisions of national categorical pretreatment standards may be made by the city in accordance with 403.7(b)(2)(i—iv) of the "General Pretreatment Regulations for Existing and New Sources of Pollution," if requested by the industry(ies) in accordance with requirements of 403.7(b)(1)(i).

B.

State requirements. State requirements and limitations on discharges shall be met by all users which are subject to such standards in any instance in which they are more stringent than federal requirements and limitations or those in this or any other applicable ordinance.

C.

City's right of revision. The city reserves the right to establish by ordinance more stringent limitations or requirements on discharges to the wastewater disposal system if deemed necessary to comply with the objectives presented in section 1.01 of the ordinance from which this section is derived.

D.

Dilution. No user shall increase the use of process water or, in any way, attempt to dilute a discharge as a partial or complete substitute for adequate treatment to achieve compliance with the limitations contained herein, contained in the national categorical pretreatment standards, or contained in any state requirements.

E.

Supplementary limitations. No person shall discharge wastewater containing in excess of:

0.05 mg/l arsenic

5.00 mg/l barium

0.02 mg/l cadmium

0.20 mg/l copper

0.10 mg/l lead

0.005 mg/l mercury

0.80 mg/l nickel

0.02 mg/l selenium

0.01 mg/l silver

0.50 mg/l total chromium

0.50 mg/l zinc

0.01 mg/l phenolic compounds which cannot be removed by the city's wastewater treatment processes.

0.05 mg/l cyanide