The use of the public sewers of the city shall be in accordance with the following regulations:
A. Protection Of Sewage System: No person shall discharge or cause to be discharged from any connection any stormwater, surface water, ground water, roof runoff, subsurface drainage, uncontaminated cooling water or unpolluted industrial process waters to any sanitary sewer.
B. Unpolluted Drainage: Stormwater 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, complying with the requirements of section 308 of the act and, on approval of the city, to a storm sewer or natural outlet.
C. Prohibited Discharges: 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, including but not limited to cyanides in excess of two-tenths (0.2) mg/l as CN in the wastes as discharged to the public sewer;
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
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, etc., either whole or ground by garbage grinders.
D. Harmful Materials/Substances: 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 such wastes can harm either the sewers, sewage treatment process or equipment, have an adverse effect on the receiving drainage or can otherwise endanger life, limb, public property or constitute a nuisance. In forming its opinion as to the acceptability of these wastes, the city will give consideration to such factors as the quantities of subject wastes in relation to flows and velocities in the sewers, materials or 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. The substances prohibited are:
1. Any liquid or vapor having a temperature higher than one hundred fifty degrees Fahrenheit (150°F) (65°C). (Ord. 383, 2-4-1988)
2. Any water or waste containing toxic or poisonous materials, fats, wax, grease or oils, whether emulsified or not, in excess of one hundred (100) mg/l or containing substances which may solidify or become viscous at temperatures between thirty two and one hundred fifty degrees Fahrenheit (32° and 150°F) (0° and 65°C). (Ord. 383, 2-4-1988; amd. 2004 Code)
3. Any garbage that has not been properly shredded. The installation and operation of any garbage grinder equipped with a motor of three-fourths (3/4) 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 and similar objectionable or toxic substances in concentrations exceeding EPA categorical standards; or wastes exerting any excessive chlorine requirement to such degree that any such material received in the composite sewage at the sewage treatment works exceeds the limits established by the city 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 city as necessary, water 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 city in compliance with applicable state or federal regulations.
8. Any waters or wastes having a pH in excess of 9.5.
9. 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 sewage treatment works; and
d. Unusual volume of flow or concentration of wastes constituting "slugs" as defined herein.
10. 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.
E. Authority To Reject, Require Pretreatment Or Control Quantity: 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 of this section, 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:
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 cost of handling and treating the wastes not covered by existing taxes or sewer charges under the provisions of section 10-3-29 of this chapter.
If the city 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 city and subject to the requirements of all applicable codes, ordinances and laws.
F. Interceptors Required: Grease, oil and interceptors shall be provided when, in the opinion of the city, 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 and shall be located as to be readily and easily accessible for cleaning and inspection. These interceptors shall be adequately maintained and are subject to periodic inspection by the city.
G. Owner's Expense: 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 their expense.
H. Control Manhole: When required by the city, the owner of any property serviced by a building sewer carrying industrial wastes shall install a suitable control 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 city. The manhole shall be installed by the owner at the owner's expense, and shall be maintained by said owner so as to be safe and accessible at all times.
I. Measurements, Tests And Analyses: 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 latest edition of "Standard Methods for the 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 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.
J. Special Agreement/Arrangement: No statement contained in this chapter 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 city for treatment, subject to payment therefor, by the industrial concern.
K. Violation; Remedy: Any property owner or sewer user violating the provisions of this section shall, upon notice by the city, immediately install such preliminary treatment through separators, traps and/or chemical, physical or biochemical processes as will make and assure that the sewage contributed from such property or premises will meet the requirements of this chapter. (Ord. 383, 2-4-1988)