(a) No person shall discharge or cause to be discharged any unpolluted waters such as storm water, groundwater, roof runoff, subsurface drainage or cooling water to any sanitary sewer.
(b) No person shall discharge or cause to be discharged any of the following described waters or wastes to any sanitary sewer:
(1) Any gasoline, benzene, naphtha, fuel oil, motor oil or other flammable or explosive liquid, solid or gas;
(2) Any water or waste with a BOD in excess or 300 milligrams per liter, except as provided for herein;
(3) Any water or waste containing suspended solids in excess of 300 milligrams per liter, except as provided for herein;
(4) Any water 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 waste treatment process, constitute a hazard to humans or animals, create a public nuisance, or create any hazard in receiving waters of the wastewater treatment plant effluent;
(5) Any water or waste having a pH lower than 6.5 or greater than 8.5 or having any other corrosive property capable of causing damage or hazard to structures, equipment or personnel of the wastewater facilities or the sanitary sewers; and
(6) Any solid or viscous substances in quantities or of such size capable of causing obstruction to the flow in sanitary sewers, or other interference with the proper operation of the wastewater facilities such as, but not limited to, gravel, ashes, bones, red dog, sand, mud, coal, 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 and the like, either whole or ground by garbage grinders.
(c) The following described substances, materials, waters or wastes shall be limited in discharges to the sewer system, to concentrations or quantities which will not harm either the sanitary sewers or wastewater facilities; will not have an adverse effect on the receiving stream; or will not otherwise endanger lives, limb, public property or constitute a nuisance. The limitations or restrictions on materials or characteristics of waste or wastewater discharged to the sewer system which shall not be exceeded by any person without approval of the Superintendent are as follows:
(1) Wastewater having a temperature higher than 40°C;
(2) Wastewater containing more than 25 milligrams per liter of petroleum oil, non- biodegradable cutting oils or products of mineral oil origin;
(3) Wastewater containing floatable oils, fat or grease in excess of 500 milligrams per liter;
(4) Any garbage that has not been properly shredded with no particle greater than one-half inch any dimension. Garbage grinders may be connected to sanitary sewers only from homes, hotels, institutions, restaurants, hospitals or similar places where garbage originates from the preparation of food in on-site kitchens for the purpose of consumption on the premises;
(5) Any water or waste containing iron, chromium, copper, zinc, mercury and similar objectionable or toxic substances to such degree that any such material received in the composite wastewater at the wastewater facilities exceeds the limits established by Council for such materials;
(6) Any water or waste containing color-producing or odor-producing substances exceeding limits which may be established by Council;
(7) Any radioactive waste or isotopes of such half-life or concentration as may exceed limits established by Council in compliance with applicable state or federal regulations;
(8) Quantities of flow, concentrations, or both which constitute a “slug” as defined herein; and
(9) Water or waste containing substances such as synthetic detergents which are not amenable to treatment or reduction by the wastewater facilities employed, or are amenable to treatment only to such degree that the wastewater facilities effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.
(d) (1) Grease, oil and sand interceptors shall be provided when, in the opinion of the Superintendent, acting for and in behalf of the city, they are necessary for the proper handling of liquid wastes containing grease in excess of amount provided in subsection (c) above, or any flammable wastes, sand and 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 Superintendent acting for and in behalf of the city, and shall be located as to be readily and easily accessible for cleaning and inspection.
(2) Grease and oil 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.
(3) Where installed, all grease, oil and sand interceptors shall be maintained by the owner, at his or her expense, in continuously efficient operation at all times.
(e) No statement contained in this article shall be construed as preventing any special agreement or arrangement between Council and any industrial concern whereby an industrial waste of unusual strength or character may be accepted by the city for treatment.