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August 19, 2013 (Regular Meeting) Page 1677 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. (e) A user may request a removal credit adjustment to a categorical standard in accordance with 40 CFR 403.7. 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 average discharge limits. BOD -- 300 MG /L COD - 675 MG /L TSS -- 250 MG /L NH - 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 - 0.015 MG /L Lead - 0.049 MG /L Mercury - 0.0003MG /L Nickel - 0.021 MG /L Silver - 0.005 MG /L Zinc - 0.176 MG /L Total Oil & Grease - 100 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 appropriate 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. 2.4 Rule of Stringency The most stringent limitations and requirements on pretreatment of discharges to a POTW in effect, whether imposed by WSACC, state or federal government, shall apply. The user will be required to implement such pretreatment as necessary to comply with the applicable standards. 2.5 Right Of Revision WSACC 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 1.1 of this ordinance or the general and specific prohibitions in Section 2.1 of this ordinance, as is allowed by 40 CFR 403.4. 2.6 Dilution 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 National Categorical Pretreatment Standards, unless expressly authorized by an applicable pretreatment standard, or in any other pollutant- specific limitation developed by WSACC or State. 2.7 Pretreatment of Wastewater (a) Pretreatment Facilities Users shall provide wastewater treatment as necessary to comply with this ordinance, and wastewater permits issued under Section 4.2 of this ordinance and shall achieve compliance with all national categorical pretreatment standards, local limits and the prohibitions set out in