(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 who are subject to those standards in any instance where they are more stringent than the limitations in this subchapter unless the City Engineer has applied for and obtained from the MPCA 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 City Engineer when the wastewater treatment system achieves consistent removal of the pollutants. Consistent removal shall be defined as in 40 C.F.R. part 403, “General Pretreatment Regulations for Existing and New Sources”. Conditional revisions of national categorical pretreatment standards may be made by the city in accordance with 40 C.F.R. part 403, “General Pretreatment Regulations for Existing and New Sources” if requested by an industry in accordance with requirements of 40 C.F.R. part 403.
(B) State requirements. State requirements and limitations on discharge shall be met by all users who are subject to those standards in any instance in which they are more stringent than federal requirements and limitations or those in this or any other applicable provision of this code of ordinances.
(C) City’s right of revision. The city reserves the right to establish by ordinance more stringent limitations or requirements on discharge to the wastewater treatment system if deemed necessary to comply with the objectives presented in this subchapter.
(D) Dilution. It is unlawful for any person to increase the use of potable or process water or in any way attempt to dilute a discharge as a partial or complete substitution for adequate treatment to achieve compliance with the limitations set forth in this subchapter or applicable pretreatment standards.
(E) Supplementary limitations.
(1) It is unlawful for any person to discharge wastewater containing the following substances in excess of the amounts contained in their wastewater discharge permit.
(2) Once limits are appropriated for individual industries, those industries’ rights to discharge up to those limits shall not be reduced by permit limits issued later to new industries. Reduction of limits may be necessary to achieve the objectives stated in this subchapter.
(2004 Code, § 53.073) (Ord. 727, passed 12-12-1985; Ord. 14-0722, passed 3-11-2014) Penalty, see § 10.99