(a)   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 water to any sanitary sewer.
   (b)   Storm water and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as combined sewers or storm sewers, or to a natural outlet approved by the Supervisor of City Maintenance. Industrial cooling water or unpolluted process water may be discharged, on approval of the Supervisor, to a storm sewer, combined sewer or natural outlet.
   (c)   No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewer:
      (1)   Any gasoline, benzene, naphtha, fuel oil or other flammable or explosive liquid, solid or gas;
      (2)   Any water or waste 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 water or waste 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; or
      (4)   Solid or viscous substances in quantities or of such a 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, etc., either whole or ground by garbage grinders.
   (d)   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 Supervisor, that such wastes can harm either the sewers or the sewage treatment process or equipment; have an adverse effect on the receiving stream; otherwise endanger life, limb or public property; or constitute a nuisance. In forming his or her opinion as to the acceptability of wastes, the Supervisor will give consideration to such factors as the quantities of subject wastes in relation to flows and velocities in the sewers, the nature of the sewage treatment process, the capacity of the sewage treatment plant, the degree of treatability of wastes in 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 degrees Fahrenheit (sixty-five degrees Centigrade);
      (2)   Any water or waste 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 thirty-two and 150 degrees Fahrenheit (zero and sixty-five degrees Centigrade);
      (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 (0.76 hp metric) or greater shall be subject to the review and approval of the Supervisor.
      (4)   Any water or waste containing strong acid, iron pickling wastes or concentrated plating solution, whether neutralized or not;
      (5)   Any water or waste containing iron, chromium, copper, zinc or similar objectionable or toxic substances, or waste exerting an excessive chlorine requirement to such a degree that any such material received in the composite sewage at the sewage treatment works exceeds the limits established by the Supervisor for such materials;
      (6)   Any water or waste containing phenols or other taste or odor producing substances in such concentrations exceeding limits which may be established by the Supervisor as necessary after treatment of the composite sewage to meet the requirements of State, Federal or other public agencies of jurisdiction for such discharge to the receiving waters;
      (7)   Any radioactive waste or isotope of such half-life or concentration as may exceed limits established by the Supervisor in compliance with applicable State or Federal regulations;
      (8)   Any water or waste 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 Supervisor in compliance with applicable State and Federal regulations;
      (10)   Any cyanide in excess of 2.0 mg/l at any time, except as permitted by the Supervisor in compliance with applicable State and Federal regulations;
      (11)   Materials which exert or cause:
         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 such quantities as to constitute a significant load on the sewage treatment works; or
         D.   Unusual volume of flow or concentrations of wastes constituting slugs;
      (12)   Any water or waste containing substances which are not amenable to treatment or reduction by the sewage treatment processes employed, or which are amenable to treatment only to such a degree that the sewage treatment plant effluent cannot meet the requirements of agencies having jurisdiction over discharge to the receiving waters.
   (e)   If waters or wastes are discharged or proposed to be discharged to the public sewers, which waters or wastes contain the substances or possess the characteristics enumerated in subsection (d) hereof, and/or which are in violation of the standards for pretreatment provided in 40 CFR 403, June 26, 1978, and any amendments thereto, and which, in the judgment of the Supervisor, 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 Supervisor may:
      (1)   Reject the wastes;
      (2)   Require pretreatment to an acceptable condition for discharge to the public sewers;
      (3)   Require control over the quantities and rates of discharge; and/or
      (4)   Require payment to cover the added costs of handling and treating the wastes not covered by existing taxes or sewer charges under Section 1043.08.
   If the Supervisor permits the pretreatment or equalization of waste flows, the design and installation of the plants and equipment shall be subject to the review and approval of the Supervisor and subject to the requirements of all applicable codes, ordinances and laws. Where preliminary treatment or flow equalizing facilities are provided, they shall be maintained continuously in satisfactory and effective operation by the owner at his or her expense.
(Ord. 569.  Passed 9-21-88.)