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1 � <br /> • • <br /> • ` EXHIBIT A <br /> cinders, sand, spent lime, stone or marble dust, metal, mud, glass, straw, <br /> shavings, grass clippings, rags, spent grains, spent hops, waste paper, wood, <br /> plastics, tar, asphalt residues, residues from refining or processing of fuel or <br /> lubricating oil, seafood processing by-products, and similar substances. <br /> (4) Any wastewater which will cause corrosion, deterioration of the <br /> wastewater system, or constitute a hazard to equipment or humans. All wastes <br /> discharged to the wastewater system shall have a pH value of not less than 6.0 <br /> standard units. Prohibited materials include, but are not limited to: acids, <br /> sulfides, concentrated chloride and fluoride compounds, and substances which <br /> will react with water to form acidic products. <br /> (5) Any waters or wastes containing toxic or poisonous solids, liquids, , <br /> or gases in sufficient quantity, either singly or by interaction with other wastes, to II <br /> injure or interfere with any sewage treatment process, constitute a hazard to <br /> humans or animals, create a public nuisance, or create any hazard in the <br /> receiving waters of the sewage treatment plant. <br /> (6) Any waters or wastes containing chromium, copper, zinc, and <br /> similar objectionable or toxic substances; or wastes exerting an excessive <br /> chlorine requirement, to such degree that any such material received in the <br /> composite sewage at the sewage treatment works exceeds the limits established <br /> by the Sanitary District of Decatur. <br /> (7) Any noxious or malodorous solids, liquids, or gases, which, either <br /> singly or by interaction with other wastes, are capable of creating a public <br />