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The Service Director may impose mass limitations on dischargers when deemed <br />appropriate by the City. The Director may also convert Categorical Pretreatment <br />Standards expressed in terms of mass to equivalent concentration limits when deemed <br />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 <br />+5-.9 <br />Lead <br />0.5 <br />Mercury <br />0.01 <br />Nickel <br />3.0 <br />4" <br />Selenium <br />0.2 <br />Silver <br />2.0 <br />Toxie Or-ganies, Any One Solvent <br />8:4 <br />2-4 <br />Zinc <br />2.0 <br />The Service Director may impose mass limitations on dischargers when deemed <br />appropriate by the City. The Director may also convert Categorical Pretreatment <br />Standards expressed in terms of mass to equivalent concentration limits when deemed <br />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 <br />