(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 storm sewers, or to a natural outlet approved by the Inspector. Industrial cooling water or unpolluted process waters may be discharged, on approval of the Inspector and upon issuance of an NPDES permit, to a storm 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 material, or volatile liquid.
(2) Any waters or wastes containing toxic or poisonous pollutants in sufficient quantity, either singly or by interaction with other pollutants, to injure or interfere with any sewage treatment process, constitute a hazard to humans or animals, or create any hazard or toxic effect in the receiving waters of the sewage treatment plant, or to exceed the limits set forth in the Categorical Pretreatment Standards of the Act. A toxic pollutant shall include but not be limited to any pollutant identified pursuant to Section 307(a) of the Clean Water Act.
(3) Any waters or wastes having a pH lower than 6.0 or greater than 9.0, or having any other corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the sewage works.
(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 sewer works. This includes, but is 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, entrai1s, and paper dishes, cups, milk containers, and the like, either whole or ground by garbage grinders. Also included are any materials which, by reason or mixture or interaction, tend to cause obstruction, or otherwise interfere with operation of the sewerage works.
(d) No person shall discharge or cause to be discharged any of the following described substances, materials, waters, or wastes if it appears likely 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 an opinion as to the acceptability of these wastes, consideration will be given to such factors as the quantities of subject waste 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, degree of treatability of wastes in the sewage treatment plant, and other pertinent factors. Prohibited substances include:
(1) Any liquid or vapor having a temperature higher than 105° F. (65° C.);
(2) Any water or waste containing wax, fats, grease, 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 degrees and 150 degrees F. (0 degrees and 65 degrees C.);
(3) Any garbage that has not been properly shredded. The installation and operation of any garbage grinder equipped with a motor of 3/4-horsepower (0.76 hp metric) or greater shall be subject to review and approval of the Municipality;
(4) Any waters or wastes containing acid iron pickling wastes, or any concentrated plating solutions whether neutralized or not, without prior approval by the Municipality;
(5) Any water or wastes containing iron, chromium, copper, zinc, and any other objectionable or toxic substances; or wastes 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 Municipality for such materials;
(6) Any waters or wastes containing phenols or other taste or odor producing substances, in such concentrations exceeding limits which may be established by the Municipality 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 established limits in compliance with acceptable 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 so as to constitute a significant demand on the sewage treatment works;
D. Unusual volume of flow or concentration of wastes constituting "slugs" as defined in Section 929.02(39).
(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 degree that the sewage treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters;
(10) Any wastewater that causes the receiving plant to violate the conditions of the NPDES permit.
(e) (1) If any waters or wastes are discharged, or are to be proposed to be discharged to public sewers, which waters contain the substances or possess characteristics previously enumerated in this chapter, and which have a deleterious effect upon the sewage works, processes, equipment, or which otherwise create a hazard to life or constitute a public nuisance, the Municipality may:
A. Reject any 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 cost of handling and treating the wastes not covered by existing taxes or sewer charges under the provisions of Section 929.19.
(2) If the Municipality 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 Municipality and subject to the requirements of all applicable codes, ordinances, and laws.
(f) Grease, oil, and sand interceptors shall be provided when 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 Municipality and shall be located as to be readily accessible for cleaning and inspection.
(g) 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.
(h) When required by the Municipality, the owner of any property serviced by a building sewer carrying industrial wastes shall install a suitable manhole together with such necessary meters and other appurtenances in the building sewer to facilitate observation, sampling, and measurement of the wastes. Such manhole, when required, shall be accessibly and safely located, and shall be constructed in accordance with plans approved by the Municipality. 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.
(i) All measurements, tests, and analyses of the characteristics of waters and wastes to which reference is made in this chapter shall be determined in accordance with the October 16, 1975 Federal Register (40 CFR, Part 136), or otherwise by EPA approved methods and shall be determined at the control manhole provided, or upon suitable samples taken at said 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 building sewer 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 analyses involved will determine whether a 24-hour composite of outfalls of a premise is appropriate or whether a grab sample or samples should be taken. Normally, but not always, BOD and suspended solids analyses are obtained from 24-hour composites of all outfalls whereas pH's are determined from periodic grab samples).
(j) No statement contained in this section shall 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 Municipality for treatment, subject to the payment of a surcharge based on the strength and character of the waste, provided such payments are in accordance with federal and state guidelines for user charge system and industrial cost recovery systems.
(k) The Municipality shall have the right to reject any industrial waste which may not be compatible with the treatment process or the sewage works. The Municipality further has the right to require pretreatment of industrial wastes if deemed necessary, and to impose a surcharge commensurate with any added difficulty or added direct cost associated with an industrial waste.
(Ord. 518. Passed 6-25-90.)