933.04  DISCHARGE INTO PUBLIC SEWERS.
   (a)   Unpolluted Discharge.  No person(s) shall discharge or cause to be discharged any unpolluted waters such as stormwater, groundwater, roof runoff, subsurface drainage, or cooling water to any sewer, except stormwater runoff from limited areas, which stormwater may be polluted at times, may be discharged to the sanitary sewer by permission of the Manager and the necessary permit obtained.
   (b)   Stormwater.  Stormwater other than that exempted under subsection (a) hereof, and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as combined sewers, storm sewers or to a natural outlet approved by the M.U.C. Manager and other regulatory agencies. Unpolluted industrial cooling water or process waters may be discharged on approval of the Manager to combined sewer or natural outlet.
   (c)   Flammable, Explosive or Hazardous Substance  and Foreign Matter.  No person(s) shall discharge or cause to be discharged any of the following described waters or wastes to any public sewers:
      (1)   Any gasoline, benzene, naptha, 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, yard waste (grass, leaves, sticks, etc.) ashes, bones, 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, 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 municipal systems 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 Manager may set limitations lower than the limitations established in the regulations below if in his opinion such more severe limitations are necessary to meet the above objectives. In forming his opinion as to the acceptability, the Manager 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 Manager are as follows:
      (1)   Wastewater having a temperature higher than 150° Fahrenheit (65° 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 (see Section 933.01(n)). 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 Manager for such materials.
      (6)   Any waters or wastes containing odor-producing substances exceeding limits which may be established by the Manager.
      (7)   Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the Manager 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.
      (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.
   (e)   Conditional Service.  If any waters or wastes are discharged or are proposed to be discharged to the public sewers, which waters contain the substances or possess the characteristics enumerated in subsection (d) hereof, and which in the judgement of the Manager may have a deleterious effect upon the wastewater facilities, structures, processes, equipment, or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the Manager may:
      (1)   Reject the wastes;
      (2)   Require pretreatment to an acceptable condition for discharge to public sewers;
      (3)   Require control over the quantities and rates of discharge; and/or
      (4)   Require payment to cover added cost of handling and treating the wastes not covered by existing taxes or sewer charges under the provisions of subsection (j) hereof.
   When considering the above alternatives, the Manager shall give consideration to the economic impact of each alternative on the discharger. If the Manager 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 Manager.
   (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, as specified in subsection (d)(3) hereof, 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 Manager, 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 Manager. 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 Manager, 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 accessibly and safely located and shall be constructed in accordance with plans approved by the Manager. 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 chapter. These requirements may include:
      (1)   Wastewaters discharge peak rate and volume over a specified time period.
      (2)   Chemical analyses 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 municipal sewer.
   (j)   Measurements, Tests, and Analyses.  All measurements, tests, and analyses of the characteristics of waters and wastes to which reference is made in this chapter 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 City and any industrial concern whereby an industrial waste of unusual strength or character may be accepted by the City for treatment.
(Ord. 2000-05. Passed 2-22-00.)