Sec. 19-2-4. Modification of federal categorical pretreatment standards.

(a) Where the WPCF achieves consistent removal of pollutants limited by pretreatment standards, the city may apply to the Administrator for modification of specific limits in the pretreatment standards. The city may then modify pollutant discharge limits in the pretreatment standards if the requirements contained in 40 CFR 403.7 are fulfilled and prior approval from the Administrator is obtained.
(b) Where a pretreatment standard is expressed only in terms of either the mass or the concentration of a pollutant in wastewater, the city may impose equivalent concentration or mass limits in accordance with 40 CFR 403.6(c).
(c) When wastewater subject to a pretreatment standard is mixed with wastewater not regulated by the same standard, the city shall impose an alternate limit using the combined wastestream formula in 40 CFR 403.6(e).
(d) A user otherwise classified as a CIU may obtain a variance from a pretreatment standard if the user can prove, pursuant to the procedural and substantive provisions in 40 CFR 403.13, that factors relating to its discharge are fundamentally different from the factors considered by EPA when developing the pretreatment standard.
(e) A CIU may obtain a net gross adjustment to a pretreatment standard in accordance with 40 CFR 403.15. (Ord. No. 1271, § 1 (part).)