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agencies of jurisdictions for such discharge to the <br />receiving waters. <br />(£) Any radioactive wastes or isotopes of such half -life or <br />concentration as may exceed limits established by the <br />City Engineer in compliance with applicable State or <br />Federal regulations. <br />(g) Any waters or wastes having a pH less than (5. 5) or in <br />excess of (9. 5). <br />(h) Materials which exert or cause: <br />1. Unusual concentrations of inert suspended solids <br />(such as, but not limited to, Fullers earth, lime <br />slurries, and lime residues) or of dissolved solids <br />(such as, but not limited to, sodium chloride and <br />sodium sulfate). <br />2. Excessive discoloration .(such as, but not limited <br />to, dye wastes and vegetable tanning solutions). <br />3. Unusual BOD, chemical oxygen demand, or chlorine <br />requirements in such quantities as to constitute a <br />significant load on the sewage treatment works. <br />4. Unusual volume of flow or concentration of wastes <br />constituting "slugs" as defined herein. <br />(i) Waters or wastes containing substances which are not <br />amenable to treatment or reduction by the sewage treat- <br />ment processes employed, or are amenable to treatment <br />only to such degree that the sewage treatment plant <br />effluent cannot meet the requirements of other agencies <br />having jurisdiction over discharge to the receiving waters. <br />(j) Any substance, material, water or waste found by the City <br />Engineer to be harmful to either the sewers, sewage <br />treatment process, or equipment; or to have an adverse <br />effect on the receiving stream; or to be capable of otherwise <br />- Page 9- <br />