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(a) (1) The following described substances, materials, waters or water shall be limited in discharges to the sewerage system to concentrations or quantities which will not harm either the sewers, wastewater treatment process or equipment, will not have an adverse effect on the receiving stream or will not otherwise endanger lives, limb, public property or constitute a nuisance.
(2) The city may lower these limitations where necessary to meet the above objectives. In forming an opinion as to acceptability, the city will give consideration to such factors as the quantity of subject waste in relation to flows and velocities in the sewers, materials of construction of the sewers, the wastewater treatment process employed, capacity of the wastewater treatment plant, degree of treatability of the waste in the wastewater treatment plant and other pertinent factors.
(b) The limitations or restrictions on materials or characteristics of waste or wastewater discharged to the sanitary sewer which shall not be violated without the approval of the city are as follows:
(1) Wastewater having a temperature higher than 150°F (65°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 from industrial plants containing floatable oils, fat or grease;
(4) Any garbage that has not been properly shredded (see § 15-402). 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 similar objectionable or toxic substances to such degree that any such material received in the composite wastewater at the wastewater treatment works exceeds the limits established by the city for such materials;
(6) Any waters or wastes containing odor-producing substances exceeding limits which may be established by the city;
(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) Quantities of flow, concentrations, or both which constitute a slug as defined herein;
(9) 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 plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters; and
(10) Any water or wastes which, by interaction with other water or wastes in the public sewer system, release obnoxious gases, form suspended solids which interfere with the collection system, or create a condition deleterious to structures and treatment processes.
(Ord. 786, passed 2-1-1977)
(a) If any waters or wastes are discharged or are proposed to be discharged to the public sewer, which waters contain the substances or possess the characteristics enumerated in § 15-421 of this article, and which in the judgment of the city may have a deleterious effect upon the wastewater facilities, processed, equipment or receiving waters, or which otherwise create a hazard to same 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, under the provisions of § 15-427 of this article to cover added cost of handling and treating the wastes not covered by existing taxes or sewer charges.
(b) When considering the above alternatives, the city shall give consideration to the economic impact of each alternative on the discharge. 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.
(Ord. 786, passed 2-1-1977)
(a) Grease, oil and sand interceptors shall be provided when, in the opinion of the city, such are necessary for the proper handling of liquid wastes containing floatable oils, fat or 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.
(b) 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. In maintaining these interceptors the owner(s) shall be responsible for proper removal and disposal by appropriate means of captured material and shall maintain records of the dates, and means of disposal which are subject to review by the city. Any removal and hauling of collection materials not performed by owner(s) personnel must be performed by currently licensed waste disposal firms.
(Ord. 786, passed 2-1-1977)
(a) When required by the city, the owner of any property serviced by a building sewer carrying industrial wastes shall install a suitable structure together with such necessary meters and other appurtenances in the building sewer to facilitate observation, sampling and measurement of the wastes. Such structures, when required, shall be accessibly and safely located and shall be constructed in accordance with the plans approved by the city.
(b) The structure shall be installed by the owner at his or her expense and shall be maintained so as to be safe and accessible at all times.
(Ord. 786, passed 2-1-1977)
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