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pass through. Section 10-2.2 National Categorical Pretreatment Standards. Users subject to categorical pretreatment standards are required to comply with applicable standards as set out in 40 CFR Chapter 1, Subchapter N, Parts 405-471 and incorporated herein. ao Where a categorical pretreatment standard is expressed only in terms of either the mass or the concentration of a pollutant in wastewater, the Executive Director may impose equivalent concentration or mass limits in accordance with 40 CFR 403.6(c). When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the Executive Director shall impose an alternate limit using the combined wastestream formula in 40 CFR 403.6(e). A user may obtain a variance from a categorical 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 categorical pretreatment standard. d. A user may obtain a net gross adjustment to a categorical standard in accordance with 40 CFR 403.15. Section 10-2.3 Industrial Waste Survey and Local Limits. An Industrial Waste Survey is required prior to a user discharging wastewater containing in excess of the following maximum daily discharge limits: BOD - 300 MG/L COD - 675 MG/L TSS - 175 MG/L NH3 - 15 MG/L Aluminum - 1.80 MG/L Arsenic - 0.003 MG/L Cadmium - 0.003 MG/L Copper - 0.090 MG/L Chromium - 0.020 MG/L Cyanide - 0.041 MG/L Lead - 0.049 MG/L Mercury - 0.0003 MG/L Nickel - 0.021 MG/L Silver - 0.005 MG/L Zinc - 0.176 MG/L Industrial Waste Survey information will be used to develop user-specific local limits when necessary to ensure that the POTW's maximum allowable headworks loading is not exceeded for particular pollutants of concern. User-specific local limits for appropriated pollutants of concern shall be included in wastewater permits. The Executive Director may impose mass limits in addition to, or in place of, concentration-based limits. section 10-2.4 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. Section 10-2.5 Right of Revision. The County reserves the right to establish limitations and requirements which are more stringent than those required by either State or Federal regulation if deemed necessary to comply with the objectives presented in Section 10-1 of this Article 44