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(j) Solids. <br /> (3); Suspended Solids. The average concentration <br /> of suspended solids shall not exceed <br /> _______ 3, 000 mg/liter nor shall <br /> the. maximum. concentration ofsuspended .solids . exceed,6:, 000 <br /> mg/liter. <br /> (n) Toxicity. Toxic dischargesinclude, but` are not,. <br /> limited to, heavy metals, cyanides, 'phenols, bactericides, <br /> antibiotics and -insecticides. <br /> (1) The. f. lowing is a ..nonexclusive list of toxic <br /> substances and .the maximum..concentrations allowed,. for each <br /> 'discharge of 50,000 gallons per day or " less. . For discharges <br /> greater than 50,000 gallons per day the maximum concentration <br /> shall be .,one-half. the, values in :the- table with the exception of <br /> silver,' for which the limit shall ,remain 0.25,.mg/liter regardless <br /> of flow: <br /> Maximum <br /> Toxicant Concentration Allowable <br /> Silver .; _ 0.25 -mg/liter <br /> Zinc 2. 0 mg/liter <br /> (2) Fluoride. The average-and maximum <br /> concentration_ allowable of. fluoride `for discharge `into ,the sewer <br /> system shall.. be 65 mg/liter. <br /> (3) Silver. The maximum concentration allowable <br /> for silver -set f.orth. in this section shall not be ;applicable to <br /> photographic materials,processing. Silver .limitations for _. . <br /> photoprocessors,- are.. set, forth. below in Section 6-4.-421. <br /> these ;limitations set forth in this section <br /> are subject. to change in the future as the requirements placed .on <br /> the Palo Alto Regional Water Quality Control Plant become more <br /> stringent and as the process for establishing the industrial <br /> waste ;limitations. 'is . refined. . <br /> 2 - <br />