(A) The following described substances, materials, waters, or wastes shall be limited in discharges to municipal systems to concentrations or quantities which will not harm either the sewers or 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. The City Engineer may set limitations lower than the limitations established in the regulations below if, in his opinion, more severe limitations are necessary to meet the above objectives. In forming his opinion as to acceptability, the City Engineer shall 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 wastes or wastewaters discharged to the sanitary sewer which shall not be violated without approval of the City Engineer 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, nonbiodegradable 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. 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 a degree that any material received in the composite wastewater at the wastewater treatment works exceeds the limits established by the Superintendent for these materials.
(6) Any waters or wastes containing odor-producing substances exceeding limits which may be established by the Superintendent.
(7) Any radioactive wastes or isotopes of a half-life or concentration as may exceed limits established by the Superintendent in compliance with applicable state or federal regulations.
(8) Quantities of flow, concentrations, or both which constitute a slug as defined in § 53.01.
(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 the degree that the wastewater treatment plant effluent cannot meet the requirements of state or federal agencies having jurisdiction over discharge to the receiving waters.
(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.
(C) If any waters or wastes are discharged or are proposed to be discharged to the public sewers, which contain the substances or possess the characteristics enumerated in division (B) and which, in the judgment of the City Engineer, may have a deleterious effect upon the wastewater facilities, processes, or equipment, or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the Superintendent 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;
(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 § 53.29.
When considering the above alternatives, the City Engineer shall give consideration to the economic impact of each alternative on the discharger. If the City Engineer 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 Engineer.
(Ord. 610.14A, passed 1-18-82) Penalty, see § 53.99