(a) Unpolluted Discharge. No person(s) shall discharge or cause to be discharged any unpolluted waters such as storm water, groundwater, roof runoff, subsurface drainage, or cooling water to any sewer, except storm water runoff from a limited area, which stormwater may be polluted at times, may be discharged to the sanitary sewer without permission of the Utility Board and the necessary permit obtained.
(b) Storm water. Storm water other than that exempted herein, and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as combined sewers or to a natural outlet approved by the Utility Board and other regulatory agencies. Unpolluted industrial cooling water or process waters may be discharged on approval of the Manager to a storm sewer, combined sewer, or natural outlet.
(c) Flammable, Explosive or Hazardous Substances and Foreign Matter. No person(s) shall discharge or cause to be discharged any of the following described waters or wastes to any public sewer:
(1) Any gasoline, benzene, naphtha, fuel oil, or other flammable or explosive liquid, solid, or gas.
(2) Any waters containing toxic or poisonous solids, liquids, or gases in sufficient quantity, either singly or by interaction with other wastes which injure or interfere with any waste treatment process; constitute a hazard to humans or animals; create a public nuisance; or create any hazard in the receiving waters of the wastewater treatment plant.
(3) Any waters or wastes having a pH lower or higher than that normally encountered in the system, or having any other corrosive property capable of causing damage or hazard to structures, equipment/operation and personnel of the wastewater works without a permit to do so.
(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 proper operation of the wastewater facilities such as, but not limited to, ashes, bones, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, ungrounded garbage, whole blood, paunch manure, hair and fleshings, entrails and paper dishes, cups, milk containers, etc., either whole or ground by garbage grinders.
(d) Toxic Substances. The following described substances, materials, waters, or waste shall be limited in discharges to City sewer 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. The Utility Board may set limitations lower than the limitations established in the regulations below if, in its opinion, such additional limitations are necessary to meet the above
objectives. In forming its opinion as to the acceptability, the Utility Board 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. The limitations or restrictions on materials or characteristics of waste or wastewater discharged to the sanitary sewer, which shall not be violated without approval of the Utility Board, are as follows:
(1) Wastewater having a temperature higher than 150 degrees Fahrenheit (65 deg. Celsius).
(2) Wastewater containing more than 25 milligrams per liter of petroleum oil, nonbiodegradable cutting oils, or product of mineral oil origin.
(3) Wastewater from industrial plants containing floatable oils, fat, or grease.
(4) Any garbage that has not been properly shredded to dimensions as specified under Definitions. 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 material received in the composite wastewater at the wastewater treatment works exceeds the limits established by the Utility Board for such materials.
(6) Any waters or wastes containing odor-producing substances exceeding limits, which may be established by the Utility Board.
(7) Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the Utility Board or 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.
(10) Any water or wastes which, by interaction with other water or wastes in the public sewer system, release obnoxious gases, from suspended solids which interfere with the collection system, or create a condition deleterious to structures and treatment processes.
(e) Conditional Service.
(1) If any waters or wastes are discharged or are proposed to be discharged to the public sewers, which in the judgment of the Utility Board may have a deleterious effect upon the wastewater facilities, processes, equipment, or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the Utility Board may:
A. Reject the wastes.
B. Require pretreatment to an acceptable condition for discharge to public sewers.
C. Require control over the quantities and rates of discharge, and/or
D. Require payment to cover the added cost of handling and treating the wastes covered by existing taxes or sewer charges.
E. Terminate the users sewerage service.
(2) When considering the above alternatives, the Utility Board shall give consideration to the economic impact of each alternative on the discharger. If the Utility 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 Utility Board.
(f) Grease. Oil and Sand Separators. Grease, oil and sand interceptors shall be provided when, in the opinion of the Manager, they are necessary for the proper handling of liquid wastes containing floatable 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 shall be of a type and capacity approved by the Utility Board, and shall be located as to be readily and easily accessible for cleaning and inspection. In the maintaining of these interceptors the owner(s) shall be responsible for the proper removal and disposal by appropriate means of the captured material and shall maintain records of the dates, and means of disposal, which are subject to review by the Utility Board. Any removal and hauling of the collected materials not performed by owner(s) personnel must be performed by currently licensed waste disposal firms.
(g) Pretreatment. Where pretreatment or flow-equalizing facilities are provided or required for any waters or wastes, they shall be maintained continuously in satisfactory and effective operation by the owner(s) at his expense.
(h) Metering and Sampling Devices. When required by the Utility Board, 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 wastes. Such structure, when required, shall be easily accessible, safely located and shall be constructed in accordance with plans approved by the Utility Board. The structure 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) Design Data on Connection. The Manager may require a user of sewer services to provide information needed to determine compliance with this ordinance. These requirements may include, but are not limited to:
(1) Wastewaters discharge peak rate and volume over a specified time period.
(2) Chemical analysis of wastewaters.
(3) Information on raw materials, processes, and products affecting wastewater volume and quality.
(4) Quantity and disposition of specific liquid, sludge, oil, solvent, or other materials important to sewer use control.
(5) A plot plan of sewers of the user's property showing sewer and pretreatment facility location.
(6) Details of wastewater pretreatment facilities.
(7) Details of systems to prevent and control the losses of materials through spills to the City sewer.
(j) Measurements. Tests. and Analysis. All measurements, tests, and analysis of the characteristics of waters and wastes to which reference is made in this ordinance 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. Sampling methods, location, times, durations, and frequencies are to be determined on an individual basis subject to approval by the Manager.
(k) Disclaimer. No statement contained in this article shall be construed as preventing any special agreement or arrangement between the Utility Board and any industrial concern whereby an industrial waste of unusual strength or character may be accepted by the Utility Board for treatment. (Ord. 252. Passed 9-9-99.)