(A) (1) No person shall discharge, or cause to be discharged, any storm water, surface water, ground water, roof runoff, subsurface drainage, uncontaminated cooling water or unpolluted industrial process waters to any sanitary sewer.
(2) Storm water and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as storm sewers or to a natural outlet approved by the city. Industrial cooling water or unpolluted process waters may be discharged, on approval of the city, to a storm sewer or natural outlet.
(B) No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewers:
(1) Any gasoline, benzene, naphtha, fuel oil or other flammable or explosive liquid, solid or gas;
(2) Any waters or wastes containing toxic or poisonous solids, liquids or gases in sufficient quantity, either singly or by interaction with other wastes, to injure or interfere with any sewage treatment process, constitute a hazard to humans or animals, create a public nuisance, or create any hazard in the receiving waters of the sewage treatment plant;
(3) Any waters or wastes having a pH lower than 5.5 or having any other corrosive property capable of causing damage or hazard to structures, equipment and personnel of the sewage works; and/or
(4) Solid or viscous substances in quantities or of such size capable of causing obstruction to the flow in sewers, or other interference with the proper operation of the sewage works such as, but not limited to, ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, unground garbage, whole blood, paunch manure, hair and fleshings, entrails and paper dishes, cups, milk containers and the like, either whole or ground by garbage grinders.
(C) No person shall discharge or cause to be discharged the following described substances, materials, waters or wastes if it appears likely in the opinion of the city that the wastes can harm either the sewers, sewage treatment process or equipment; have an adverse effect on the receiving stream; or can otherwise endanger life, limb or public property or constitute a nuisance. In forming the opinion as to acceptability of these wastes, the city will give consideration to the factors as the quantities of subject wastes in relation to flows and velocities in the sewers, materials of construction of the sewers, nature of the sewage treatment process, capacity of the sewage treatment plant and maximum limits established by regulatory agencies. The substances prohibited are:
(1) Any liquid or vapor having a temperature higher than 150°F (65°C);
(2) Any waters or wastes containing toxic or poisonous materials; or oils, whether emulsified or not, in excess of 100 mg/l or containing substances which may solidify or become viscous at temperatures between 32° and 150°F (0° and 65°C);
(3) Any garbage that has not been properly shredded. The installation and operation of any garbage grinder equipped with a motor of three-fourths horsepower or greater shall be subject to the review and approval of the city;
(4) Any waters or wastes containing strong, acid, iron pickling wastes or concentrated plating solutions whether neutralized or not;
(5) Any waters or wastes containing iron, chromium, copper, zinc or similar objectionable or toxic substances; or wastes exerting an excessive chlorine requirement, to a degree that any such material received in the composite sewage at the sewage treatment works exceeds the limits established by the city for the materials;
(6) Any waters or wastes containing phenols or other taste or odor producing substances, in concentrations as may exceed limits as established by the city in compliance with applicable state and federal regulations;
(7) Any radioactive wastes or isotopes of a half-life or concentration as may exceed limits established by the city in compliance with applicable state or federal regulations;
(8) Any waters or wastes having a pH in excess of 9.5;
(9) Any mercury or any of its compounds in excess of 0.0005 mg/l as Hg at any time except as permitted by the city in compliance with applicable state and federal regulations;
(10) Any cyanide in excess of 0.025 mg/l at any time except as permitted by the city in compliance with applicable state and federal regulations;
(11) Material which exerts or causes:
(a) Unusual concentrations of inert suspended solids (such as, but not limited to, fullers earth, lime slurries and lime residues) or of dissolved solids (such as, but not limited to, sodium chloride and sodium sulfate);
(b) Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions);
(c) Unusual BOD, chemical oxygen demand or chlorine requirements in quantities as to constitute a significant load on the sewage treatment works; and/or
(d) Unusual volume of flow or concentrations of wastes constituting "slugs", as defined herein.
(12) Waters or wastes containing substances which are not amenable to treatment or reduction by the sewage treatment processes employed, or are amenable to treatment only to a degree that the sewage treatment plant effluent cannot meet the requirements of agencies having jurisdiction over discharge to the receiving waters.
(D) (1) If any waters or wastes are discharged or are proposed to be discharged to the public sewers, which waters contain the substances or possess the characteristics enumerated in division (C) of this section and/or which are in violation of the standards for pretreatment provided in Chapter 1, EPA Rules and Regulations, subchapter D, Water Programs Part 128 Pretreatment Standards, Federal Register Volume 38, No. 215, Thursday, 11-8-1973, and any amendments thereto, and which in the judgment of the city may have a deleterious effect upon the sewage works, processes, equipment or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the city may:
(a) Reject the wastes;
(b) Require pretreatment to an acceptable condition for discharge to the public sewers;
(c) Require control over the quantities and rates of discharge; and/or
(d) Require payment to cover the added costs of handling and treating the wastes not covered by existing taxes or sewer charges under the provisions hereof.
(2) If the city permits the pretreatment of equalization of waste flows, the design and installation of the plants and equipment shall be subject to the review and approval of the city and subject to the requirements of all applicable codes, ordinances and laws.
(Prior Code, § 23-34) (Ord. 554, passed - -; Ord. 759, passed - -)