§ 115-4. Federal categorical pretreatment standards.

A. 

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 chapter for sources in that subcategory, shall immediately supersede the limitations imposed under this chapter. The Superintendent shall notify all affected users of the applicable reporting requirements under 40 CFR, Section 403.12.

B. 

Where the city's wastewater treatment system achieves consistent removal of pollutants limited by federal categorical pretreatment standards, the City may apply to the approval authority for modification of specific limits in the federal pretreatment standards. As used in this subsection, "consistent removal" means reduction in the amount of a pollutant or alteration of the nature of the pollutant by the wastewater treatment system in 95% of the samples taken when measured according to the procedures set forth in Section 403.7(c)(2) of 40 CFR, Part 403, "General Pretreatment Regulations for Existing and New Sources of Pollution," promulgated pursuant to the Act. The City may then modify pollutant discharge limits if the requirements of 40 CFR, Part 403, Section 403.7, are fulfilled and prior approval from the approval authority is obtained.

C. 

Existing sources shall comply with any applicable categorical pretreatment standards within three years from the date that the standard is effective unless a shorter compliance date is specified in the standard.