§ 150-26. National and state limitations.

A. 

National Categorical Pretreatment Standards. Upon the promulgation of the National Categorical Pretreatment Standards for a particular industrial subcategory, the general and specific limitations contained therein, if more stringent than limitations imposed under this chapter for sources in that industrial category, shall immediately supersede the limitations imposed under this chapter. The National Categorical Pretreatment Standards, located in 40 CFR chapter 1, Subchapter N, Parts 405-471, are hereby incorporated into this chapter. The Director of Utilities shall notify all affected industrial users of the applicable reporting requirements relating to the National Categorical Pretreatment Standards pursuant to 40 CFR 403.12.

B. 

Removal credits. Where the City's wastewater treatment system achieves consistent removal of pollutants limited by federal pretreatment standards, the City may apply to the approval authority for removal credits to enable the City to modify the specific limits in the National Categorical Pretreatment Standards. "Consistent removal" shall mean the average of the lowest 50% of the removal measured in accordance with the procedures set forth in 40 CFR 403.7(b)(2). With the prior approval of the approval authority, the City may then apply removal credits which have, as their base, consistent removal at the POTW treatment plant to modify specific pollutant discharge limits contained in the National Categorical Pretreatment Standards if the requirements contained in 40 CFR 403.7 are fulfilled and prior approval from the approval authority has been obtained.

C. 

State requirements. State requirements and limitations on wastewater discharges shall apply in any case where they are more stringent than National Categorical Pretreatment Standards and this chapter.