(a) No person shall discharge or cause to be discharged any stormwater, surface water, groundwater, roof runoff, subsurface drainage, uncontaminated cooling water, or unpolluted industrial process waters to any sanitary sewer.
(b) Stormwater and all other unpolluted drainage shall be discharged to such sewers as are specifically designed as combined sewers or storm sewers, or to a natural outlet approved by the Sanitary Board. Industrial cooling water or unpolluted process waters may be discharged, on approval of the Sanitary Board, 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 or other flammable or explosive liquid, solid or gas.
(2) 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.
(3) 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 mg/l as CN in the wastes as discharged to the public sewer.
(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 property 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, wastes or waters if it appears likely in the opinion of the Sanitary Board that such wastes can harm either the sewers, sewage treatment process, or equipment, have adverse effect on the receiving stream, or can otherwise endanger life, limb, public property or constitute a nuisance. In forming its opinion as to the acceptability of these wastes, the Sanitary Board 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 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 F. (65°C);
(2) Any water or waste containing fats, wax, grease or oil, whether emulsified or not, in excess of one hundred mg/1 or containing substances which may solidify or become viscous at temperatures between thirty-two and one hundred fifty degrees F. (0° and 65°C);
(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 (.76 hp metric) or greater shall be subject to the review and approval of the Sanitary Board;
(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; or wastes exerting an 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 Sanitary Board 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 Sanitary Board as necessary, after treatment of the composite sewage, to meet the requirements of the State, Federal or other public agencies or jurisdiction for such discharge to the receiving waters;
(7) Any radioactive wastes or isotopes as such half-life or concentration as may exceed limits established by the Sanitary Board in compliance with the 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, Fullers earth, lime slurries, and lime residues) or of dissolved solids (such as, but not limited to sodium chloride and sodium sulfate).
B. Unusual BOD, chemical oxygen demand or chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works.
C. Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions).
D. Unusual volume or 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) 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 Sanitary Board 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 Sanitary Board may:
(1) Reject the wastes;
(2) Require pretreatment to an acceptable condition for discharge to the public sewer;
(3) Require control over the quantities and rates of discharge; or
(4) Require payment to cover the added cost of handling and treating the wastes not covered by existing taxes or sewer charges.
If the Sanitary Board 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 Sanitary Board, 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 Sanitary Board, 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 of the Sanitary Board shall be of a type and capacity approved by the Sanitary Board and shall be located as to be readily and easily 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 Sanitary Board, 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 accessible and safely located, and shall be construed in accordance with plans approved by the Sanitary Board. 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 article 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 the 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 twenty-four hour composite of all outfalls of a premise is appropriate or whether a grab sample or samples should be taken. Normally, but not always, BOD and suspended solids and analyses are obtained from a twenty-four hour composite of all outfalls whereas pH is determined from periodic grab samples.
(j) No statement contained in this article 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 or the Sanitary Board for treatment, subject to payment therefor, by the industrial concern.
(k) No unauthorized person shall maliciously, willfully or negligently break, damage, destroy, uncover, deface or tamper with any structure, appurtenance or equipment which is a part of the sewage works. Any person violating this provision shall be subject to immediate arrest under charge of disorderly conduct.
(Ord. 375. Passed 8-16-76.)