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sand, spent lime, stone or marble dust, metal, glass, straw, shavings, grass clippings, rags~ spent grains, spent hops, waste paper, wood, plastic, tar, asphalt residues, residues from refining or processing of fuel or lubricating oil, and similar substances. (7) Excessive Discharge Rate. Wastewaters at a flow rate or containing such concentrations or quantities of pollutants that exceeds for any time period longer than fifteen (15) minutes more than five {5) times the average twenty-four (24) hour concentration, quantities or flow during nomal operation and that would cause a treatment process upset and subsequent loss of treatment efficiency. (8) Toxic Substances. Any toxic substances in amounts exceeding standards promulgated by the Administrator of the United States Environmental Protection Agency pursuant to Section 307(a) of the Act, and chemical elements or compounds, phenols or other taste-or-odor- producing substances, or any other substances which are not susceptible to treatment or which may interfere with the biological processes or efficiency of the treatment system, or that will pass through the system. (9) Unpolluted Waters. Any unpolluted water including, but not limited to, water from cooling systems or of stormwater origin, which will increase the hydraulic load on the treatment system. (10} Corrosive Wastes. Any waste which will cause corrosion or deterioration of the treatment system. All wastes discharged to the public sewer system must have a pH value in the range of (6) to {9) standard units. Prohibited materials, include, but are not limited to, acids, sulfides, concentrated chloride and fluoride compounds and substances which will react with water to form acidic products. {11} Any clothing, rags, textile remnants or waste, cloth, scraps, except fibers of scrap that will pass through a one-fourth {1/4) inch mesh screen or its equivalent in screening ability. {12) Any waters or wastes in which the suspended solids exceed three hundred (300) parts per million by weight. {13} Any waters or wastes in which the B0D exceeds three hundred (300) parts per million by weight. (14) Any waters or wastes in which the COD exceeds seven hundred (700) parts per million by weight. {15) Any waters or wastes in which the IOD exceeds 5.0 parts per million by weight. (16) Any materials which form excessive amounts of scum or foam that may interfere with the operation of the waste treatment works or cause undue additional labor in connection with its operation. (17) Any liquid or vapor having a temperature higher than 150°F.