(a) Applicability of federal pretreatment standards. Upon the promulgation of the federal categorical pretreatment standards for a particular industrial subcategory, the federal standard, if more stringent than limitations imposed under this article for sources in that subcategory, shall immediately supersede the limitations imposed under this article.
(b) Modification of federal pretreatment standards. Where the town's WWTP achieves consistent removal of pollutants limited by federal pretreatment standards, the town may apply to the approval authority for modification of specific limits in the federal pretreatment standards. For purposes of this section, The term "consistent removal" means a reduction in the amount of a pollutant or alteration of the nature of the pollutant by the wastewater treatment system to a less toxic or harmless state in the effluent which is achieved by the system in 95 percent of the samples taken when measured according to the procedures set forth in 40 CFR 403, "General Pretreatment Regulations for Existing and New Sources of Pollution," section 403.7(b)(2), promulgated pursuant to the act. The town may then modify pollutant discharge limits in the federal pretreatment standards if the requirements contained in 40 CFR 403.7 are fulfilled and prior approval from the approval authority is obtained.
(c) Applicability of state requirements. State requirements and limitations on discharges shall apply in any case where they are more stringent than federal requirements and limitations or those in this article.
(d) Dilution of discharge. No user shall ever 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 in the federal categorical pretreatment standards, or in any other pollutant-specific limitation improved by the town or the state.
(Code 1989, § 51.20)