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(d) A user may obtain a net gross adjustment to a categorical standard in accordance with 40 CFR 403,15, (c) A user may request a removal credit adjustmcni to a categorical standard in accordance with 40 CF11 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. BBD -- 300 MGIL COD — 675 MGfL TSS -- 250 MGIL NH3 - 15 MGIL Aluminum - 1.$0 MGIL Arsenic - 0.003 MGIL Cadmium - 0.003 MGIL Copper - 0.090 MGfL Chromium - 0.020 MGIL Cyanide - 0.015 MGfL Lead - 0.049 MGIL Mercury - 0.0003 MGIL Nickel - 0.021 MGJL Silver 0.005 MGIL Zinc- 0.176 MGIL Total Oil & Grease - 100 MGfL Industrial Waste Survey information will be used to develop user - specific local limits when necessary to ensure that the POTW's maximurn 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 [`units. 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 Attachment number 4 H -3 Page 273