(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 waters 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 City Engineer. Industrial cooling water or unpolluted process waters may be discharged, on approval of the City Engineer, 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 sewers:
(1) Any gasoline, benzene, naphtha, fuel oil, motor oil or other flammable or explosive liquid, solid or gas;
(2) Any water 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 water pollution control plant;
(3) Any water or wastes having a pH less than 5.5 or higher than 9.5 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 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 fleshing, 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 City Engineer or Superintendent, that such 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, public property or constitute a nuisance. In forming his opinion as to the acceptability of these wastes, the City Engineer or Superintendent will give consideration to such 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 water pollution control plant, degree of treatability of wastes in the water pollution control plant, and other pertinent factors. The substances prohibited include but are not limited to:
(1) Any liquid or vapor having a temperature higher than 104 degrees Fahrenheit, at the introduction into the public sewer;
(2) Any water or waste containing fats, wax, grease or oils, whether emulsified or not, in excess of 100mg/l, or containing substances which may solidify or become viscous at temperatures between thirty-two and 150 degrees Fahrenheit;
(3) Any garbage that has not been properly shredded. The installation and operation of any garbage grinder equipped with a motor of three-fourths horse power or greater, shall be subject to the review and approval of the City Engineer;
(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 and similar objectionable or toxic substances, in excess of the limits set in Section 916.05 or wastes exerting an excessive chlorine requirement . to such degree that any such material received in the composite sewage at the water pollution control plant exceeds the limits established by the Superintendent for such materials;
(6) Any water or wastes containing phenols or other taste or odor-producing substances in such concentrations exceeding limits which may be established by the Superintendent as necessary, after treatment of the composite sewage, to meet the requirements of the State, Federal or other public agencies of jurisdiction for such discharge to the receiving waters;
(7) Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the Superintendent in compliance with applicable State or Federal regulations;
(8) Materials which exert or cause:
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 water pollution control plant; or
D. Unusual volume of flow or concentration of wastes constituting "slugs", as defined herein; or
(9) 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 such a degree that the water pollution control plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.
(e) 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 subsection (d) hereof, and which, in the judgment of the City Engineer or Superintendent, 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 Engineer or Superintendent may:
(1) Require new industries or industries with significant increase in discharge to submit information on waste-water characteristics and obtain prior approval for discharges, in accordance with Chapter 916;
(2) Require other methods of disposal; and/or
(3) Require pretreatment to an acceptable condition for discharge to the public sewers; in accordance with Chapter 916; and/or
(4) Require control over the quantities, rates and times of discharge; and/or
(5) Require facilities to prevent accidental discharge of any unacceptable wastes; and
(6) 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 this section or other City ordinances.
If the City Engineer permits the pretreatment or equalization of waste flows, the design and installation of the plans and equipment shall be subject to the review and approval of the City Engineer and Superintendent, and subject to the requirements of all applicable codes, ordinances and laws.
(f) Grease, oil and sand interceptors shall be provided when, in the opinion of the City Engineer or Superintendent, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand or other harmful ingredients; except that such interceptors shall not be required for private living quarters or dwelling units. All interceptors shall be of a type and capacity approved by the City Engineer and shall be located as to be readily and easily accessible for cleaning and inspection. Provided however, that approval of any such interceptors by the City Engineer or Superintendent shall not relieve any person of the responsibility of complying with the discharge requirements of this section.
(g) Fats, grease, oil and sand interceptors shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature. They shall be of substantial construction, watertight and equipped with easily removable covers which, when bolted in place, shall be gastight and watertight.
(h) Where installed, all fats, grease, oil and sand interceptors shall be maintained by the owner, at his expense, in continuously efficient operation at all times.
(i) (1) The admission into the public sewers, of any waters or wastes having:
A. A five day BOD greater than 200 mg/l by weight; or
B. Containing more than 300 mg/l by weight of suspended solids; or
C. Containing any quantity of substances having the characteristics described in Section 912.07(d)(8); or
D. Having an average daily flow greater than five percent (5%) of the average daily sewage flow of the water pollution control plant; or
E. Having NH3-N (Ammonia Nitrogen) greater than twenty mg/l by weight;
Shall be subject to the review and approval of the City Engineer or Superintendent.
(2) Where necessary in the opinion of the Superintendent, the owner shall provide at his expense such preliminary treatment as may be necessary to:
A. Reduce BOD to 200 mg/l, the suspended solids to 300 mg/l by weight and the ammonia nitrogen to 20 mg/l; or
B. Reduce the objectionable characteristics or constituents to within the maximum limits provided in Section 912.07(d)(8); or
C. Control the quantities and rates of discharge of such waters or wastes; or
D. Be subject to surcharge.
(j) Where preliminary treatment or flow equalizing facilities are provided for any waters or wastes, they shall be maintained continuously in satisfactory and effective operation by the owner at his expense.
(k) When required by the City Engineer or Superintendent, the owner of any property serviced by a sewer lateral carrying industrial wastes shall install a suitable control manhole together with such necessary meters and other appurtenances in the sewer lateral to facilitate observations, sampling and measurement of the wastes. Such manhole, when required, shall be accessible and safely located, and shall be constructed in accordance with plans approved by the City Engineer. The manhole shall be installed by the owner at his expense, and shall be maintained by him so as to be safe and accessible at all times. See Chapter 916, Municipal Pretreatment.
(l) All measurements, tests and analysis of the characteristics of waters and wastes to which reference is made in this chapter shall be determined in accordance with the latest edition of "Standard Methods for Examination of Water and Wastewater", published by the American Public Health Association, and shall be determined at the control manhole provided or upon suitable samples taken at such control manhole. In the event that no special manhole has been required, the control manhole shall be considered to be the nearest downstream manhole in the public sewer to the point at which the sewer lateral is connected. Sampling shall be carried out by customarily accepted methods to reflect the effect of constituents upon the sewage works and to determine the existence of hazards to life, limb and property. (The particular analysis involved will determine whether a twenty-four hour composite of all outfalls of a premises is appropriate or whether a grab sample or samples should be taken. Normally, but not always, BOD and suspended solids analysis are obtained from the twenty-four hour composites of all outfalls, whereas pHs are determined from periodic grab samples.)
(m) No statement contained in this section shall be construed as preventing any special agreement or arrangements 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 the industrial concern, and in accordance with Chapter 916.
(Ord. 7-86. Passed 2-10-86. )
(Ord. 7-86. Passed 2-10-86. )