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Arsenic <br />0.2 <br />Cadmium <br />2.0 <br />Chromium, Hexavalent <br />1.0 <br />Chromium, Total <br />2.0 <br />Copper <br />1.0 <br />Cyanide, Free <br />2.0 <br />Cyanide, Total <br />2.0 <br />Iron <br />15.0 <br />Lead <br />0.5 <br />Mercury <br />Managed under BMPs <br />Nickel <br />3.0 <br />Phenols <br />10.0 <br />Selenium <br />0.2 <br />Silver <br />2.0 <br />Toxic Organics, Any One Solvent <br />0.4 <br />Toxic Organics, Total <br />2.5 <br />Zinc <br />2.0 <br />The Service Director may impose mass limitations on dischargers when deemed appropriate by <br />the City. The Director may also convert Categorical Pretreatment Standards expressed in terms <br />of mass to equivalent concentration limits when deemed appropriate. <br />Mass limitations on dischargers are intended to prevent the use of dilution to meet the <br />pretreatment standards or requirements of the Codified Ordinances, or in other cases where the <br />imposition of mass limitations is deemed appropriate by the City. <br />The POTW may develop BMPs and such BMPs shall be considered local limits and <br />pretreatment standards. <br />When the limits in a categorical Pretreatment Standard are expressed only in terms of <br />pollutant concentrations, an Industrial User may request that the Control Authority <br />convert the limits to equivalent mass limits. The determination to convert concentration <br />limits to mass limits is within the discretion of the control authority. The control authority <br />may establish equivalent mass limits only if the Industrial User meets all the following <br />conditions in paragraph 40 CFR 403.6(c)(5)(i)(A) through (c)(5)(i)(E). <br />917.03 ACCIDENTAL DISCHARGES. <br />Each discharger shall provide protection from accidental discharge of prohibited or regulated <br />materials or substances established by the Codified Ordinances. When there is a substantial <br />danger to the public health or welfare to the environment or of interfering with the sewage <br />