Except as hereinafter provided, no person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewer:
(A) Any liquids, solids, or gases which by reason of their nature or quantity are, or may be, sufficient either alone or by interaction with other substances to cause fire or explosion or be injurious in any other way to the wastewater disposal system or to the operation of the system. Prohibited materials include, but are not limited to, gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides, and sulfides;
(B) Any waters or wastes containing toxic or poisonous solids, liquids, or gases in sufficient quantity, either singly or by interaction with other wastes, that could injure or interfere with any waste treatment or sludge disposal process, constitute a hazard to humans or animals, or create a public nuisance in the receiving waters of the wastewater treatment facility. A toxic pollutant shall include, but not be limited to, any pollutant identified pursuant to Section 307(a) of the Clean Water Act;
(C) Any waters or wastes having a pH lower than 5.0, or in excess of 9.0, or having any corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the wastewater collection and treatment facilities;
(D) Solid or viscous substances in quantities or of a size capable of causing obstruction to the flow in public sewers or other interference with the proper operation of the wastewater collection and treatment facilities, 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, and the like, either whole or ground by garbage grinders; and
(E) The following described substances, materials, waters, or waste shall be limited in discharges to sanitary sewer systems to concentrations or quantities which will not harm either the sanitary sewers, wastewater treatment process, or equipment; will not have an adverse effect on the receiving stream and/or soil, vegetation, and groundwater; and will not otherwise endanger lives, limbs, public property, or constitute a nuisance. The approving authority may set limitations more stringent than those established below if more stringent limitations are necessary to meet the above objectives and/or the city’s National Pollutant Discharge Elimination System (NPDES) permit. The approving authority will give consideration to the quantity of subject waste in relation to flows and velocities in the sewers, materials of construction of the sanitary sewers, the wastewater treatment facility, and other pertinent factors. Wastes or wastewaters discharged to the sanitary sewers shall not exceed the following limitations:
(1) Wastewater having a temperature higher than 150°F (65°C);
(2) Wastewater containing fats, wax, grease, or oils, whether emulsified or not, in excess of 100 mg/l containing substances which may solidify or become viscous at temperatures between 32°F and 150°F (0°C and 65.6°C);
(3) Wastewater containing oil and grease concentrations of mineral origin of greater than 100 mg/l, whether emulsified or not;
(4) Any unground garbage. Garbage grinders may be connected to sanitary sewers from homes, hotels, institutions, restaurants, hospitals, catering establishments, or similar places where garbage originates from the preparation of food in kitchens for the purpose of consumption on the premises or when served by caterers;
(5) Any waters or wastes containing iron, chromium, copper, zinc, and other toxic and nonconventional pollutants to such a degree that the concentration exceeds levels specified by federal, state, and local authorities;
(6) Any waters or wastes containing odor-producing substances exceeding limits which may be established by the approving authority or limits established by any federal or state statute, rule, or regulation;
(7) Any radioactive wastes or isotopes of a half-life or concentration which may exceed limits established by the approving authority in compliance with applicable state or federal regulations;
(8) Any waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment processes employed, or are amenable to treatment only to such degree that the wastewater treatment facility effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters;
(9) Any water or wastes which, by interaction with other water or wastes in the sanitary sewer system, release obnoxious gases, form suspended solids which interfere with the collection system, or create a condition deleterious to structures and treatment processes;
(10) Materials which exert or cause:
(a) Unusual BOD, chemical oxygen demand, or chlorine requirements in quantities which constitute a significant load on the wastewater treatment facility;
(b) Unusual volume of flow or concentration of wastes constituting slugs as defined herein;
(c) 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 sulfate); and
(d) Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions).
(11) Incompatible pollutants in excess of the allowed limits as determined by city, state, and federal laws and regulations in reference to pretreatment standards developed by the Environmental Protection Agency, and as contained in 40 C.F.R. 403, as amended from time to time.
(Ord. 303, passed 4-21-88) Penalty, see § 10.99