(a)    No person shall discharge or cause to be discharged into the sewerage system any of the substances, materials, waters or wastes described in this section, if it appears likely, in the opinion of the City, that such discharging can harm the sewers, sewage treatment process or equipment, has an adverse effect on the receiving stream, otherwise endangers life, limb or public property, or constitutes a nuisance. The City’s designee in charge of its sewage treatment plants shall make such determination and, in forming his opinion as to the acceptability of such discharging, such designee shall give consideration to such factors as the quantities of subject wastes in relation to their flows and velocities in the sewers, the materials of construction of the sewers, the nature of the sewage treatment process, the capacity of the sewage treatment plants, the degree of treatability of wastes in the sewage treatment plants, and other pertinent factors. The prohibited substances, materials, waters or wastes are as follows:
      (1)    Any liquid or vapor having a temperature higher than 150 degrees Fahrenheit (sixty-five degrees Centigrade);
      (2)    Any water or waste containing fats, wax, grease or oils, whether emulsified or not, in excess of 100 mg/1 or containing substances which may solidify or become viscous at temperatures between thirty-two degrees and 150 degrees Fahrenheit (zero degrees 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 (seventy-six one hundredths h.p. metric) or greater shall be subject to the review and approval of the City's designee in charge of its sewage treatment plants;
      (4)    Any water or waste containing strong acid iron pickling waste or concentrated plating solution, whether neutralized or not;
      (5)    Any water or waste containing iron, chromium, copper, zinc and similar objectionable or toxic substances;
      (6)    Any water or waste having a pH in excess of nine and one-half;
      (7)    Any material which exerts or causes any of the following:
         A.    Unusual concentrations of inert suspended solids (such as, but not limited to, fuller's 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.    An unusual volume of flow or concentration of waste constituting slugs; and
      (8)    Any water or waste containing substances that are not amenable to treatment or reduction by the sewage treatment processes employed or that are amenable to such treatment only to such degree that the sewage treatment plants' effluent cannot meet the requirements of other agencies having jurisdiction over the discharge of such water or waste to the receiving waters.
   (b)    If any waters or wastes are discharged or are proposed to be discharged into the public sewers, which waters or wastes contain the substances or possess the characteristics enumerated in subsection (a) hereof and which, in the judgment of the City’s designee in charge of its sewage treatment plants, 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:
      (1)    Reject the wastes;
      (2)    Require pretreatment to an acceptable condition for discharge into the public sewers;
      (3)    Require control over the quantities and rates of discharge; and/or
      (4)    Require payment to cover the added cost of handling and treating the wastes not covered by existing taxes or sewer charges under the provisions of subsection (d) hereof.
   If the City’s designee in charge of its sewage treatment plants 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 such designee and shall be subject to the requirements of all applicable codes, ordinances and laws.
   (c)    Grease, oil and sand interceptors shall be provided when, in the opinion of the City's designee in charge of its sewage treatment plants, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, any flammable wastes, sand or other harmful ingredients, except that such interceptors shall not be required for private living quarters or dwelling units. All such interceptors shall be of a type and capacity approved by such designee and shall be located so as to be readily and easily accessible for cleaning and inspection.
      (1)    Each commercial property owner having a grease interceptor on said property shall be required to have the unit cleaned at least once every three months The property owner shall produce evidence to the City Service Department showing that the grease interceptor was properly cleaned. Such evidence shall consist of the invoice from the company that performed the cleaning service plus the canceled check showing payment for the cleaning.
      (2)    Should the commercial property owner choose to clean the interceptor itself, the Sanitary Sewer Inspector shall cause an inspection to be made of the interceptor. There shall be a fee of twenty-five dollars ($25.00) charged for such inspection.
         (Ord. 1995-20. Passed 3-14-95.)
   (d)    The provisions of this chapter shall not be construed as preventing any special agreement or arrangement between the City and any industrial concern whereby an industrial waste of unusual strength or character may be accepted by the City for treatment, subject to payment therefor by such industrial concern.
(Ord. 1973-63. Passed 12-11-73.)