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No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewers:
(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 treatment facilities 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) Solid or viscous substances which will cause obstruction to the flow in a sewer or other interference with the operation of the wastewater treatment facilities such as, but not limited to, ashes, bones, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, tissues, paunch manure, hair, hides, or paper cups, milk containers, etc., either whole or ground by garbage grinders.
(C) Any wastewater having a pH of less than 5.0 or greater than 9.5 or having any other corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the wastewater treatment facilities.
(D) Any wastewater containing toxic pollutants in sufficient quantity, either alone or by interaction with other pollutants, to inhibit or disrupt any wastewater treatment process, constitute a hazard to humans or animals, or create a toxic effect in the receiving waters of the wastewater treatment facilities. A toxic pollutant shall include, but not be limited to, any pollutant identified pursuant to Section 307(a) of the Act (33 USC 1317(a)) and M.S. § 115.01(14) as they may be amended from time to time.
(Ord. 89, passed 11-22-94) Penalty, see § 51.99
The following substances, materials, waters, or wastes shall be limited in discharges to the wastewater treatment facilities to concentrations or quantities which will not harm either sewers or the treatment facilities’ treatment process or equipment; will not have an adverse effect on the receiving stream and/or soil, vegetation, and ground water; or will not otherwise endanger life, limb, or public property or constitute a nuisance. The city may set limitations lower than limitations established in the regulations below if, in its opinion, such more severe limitations are necessary to meet the above objectives. In forming its opinion as to the acceptability of wastes, the city will give consideration to such factors as the quantity of subject waste in reaction to flows and velocities in the sewers, materials of construction of the sewers, nature of the wastewater treatment process, the city’s NPDES and/or SDS permit, capacity of the treatment plant, degree of treatability of wastes in the 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 Wastewater System Operator are as follows:
(A) Any wastewater having a temperature greater than 150°F (65.6°C), or causing, individually or in combination with other wastewater, the influent at the treatment facilities to have a temperature exceeding 104°F (40°C), or having heat in amounts which will inhibit biological activity in the treatment facilities resulting in interference therein.
(B) Any wastewater containing fats, wax, grease, or oils, whether emulsified or not, in excess of 100 mg/l or containing substances which may solidify or become viscous at temperatures between 32°F and 150°F (0° and 65.6°C); and any wastewater containing oil and grease concentrations of mineral origin of greater than 100 mg/l, whether emulsified or not.
(C) Any quantities of flow, concentrations, or both which constitute a “slug” as defined herein.
(D) A discharge of water or wastewater which in concentration or in quantity of flow exceeds for any period of duration longer than 15 minutes more than five times the average 24-hour concentration of flows during normal operation.
(E) Any garbage not properly shredded, as defined in § 51.01. 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 on the premises or when served by caterers.
(F) Any noxious or malodorous liquids, gases, or solids which either alone or by interaction with other wastes are capable of creating a public nuisance or hazard to life, or are sufficient to prevent entry into the sewers for their maintenance and repair.
(G) Any wastewater with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions.
(H) Non-contact cooling water or unpolluted storm, drainage, or ground water.
(I) Wastewater containing 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 chloride and sodium sulfate) in such quantities that would cause disruption of the wastewater treatment facilities.
(J) Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the Wastewater System Operator in compliance with applicable state or federal regulations.
(K) Any waters or wastes containing arsenic, total chromium, copper, zinc, cadmium, cyanide, lead, mercury, nickel, silver, and similar objectionable or toxic substances to such degree that any such material received in the composite wastewater at the treatment works exceeds the limits established by the Wastewater System Operator for such materials.
(L) Any waters or wastes containing BOD5 or suspended solids of such character and quantity that unusual attention or expense is required to handle such materials at the treatment facilities, except as may be permitted by specific written agreement subject to the provisions of § 51.44.
(M) Waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment process employed, or are amenable to treatment only to such degree that the effluent cannot meet the requirements or otherwise causes a violation of any statute, rule, regulation, or ordinance of any regulatory agency or state or federal regulatory body having jurisdiction over discharge into the receiving waters.
(Ord. 89, passed 11-22-94) Penalty, see § 51.99
(A) If any waters or wastes are discharged or are proposed to be discharged to the public sewers which contain substances or possess the characteristics enumerated in §§ 51.31 and 51.32; which in the judgment of the city will have a deleterious effect upon the treatment facilities, processes, or equipment, receiving waters, and/or soil, vegetation, and ground water; or which otherwise create a hazard to life 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, pursuant to Section 307(b) of the Act (33 USC 1317(b)) and all addenda thereof and as may be amended from time to time;
(3) Require control over the quantities and rates of discharge; and/or
(4) Require payment to cover the added costs of handling, treating, and disposing of wastes not covered by existing taxes or sewer charges.
(B) If the city permits the pretreatment or equalization of waste flows, the design, installation, and maintenance of the facilities and equipment shall be made at the owner’s expense and shall be subject to the review and approval of the city pursuant to the requirements of the MPCA.
(Ord. 89, passed 11-22-94)
No user shall increase the use of process water or in any manner attempt to or dilute a discharge as a partial or complete substitute for adequate treatment to achieve compliance with the limitations contained in §§ 51.31 and 51.32 or contained in the National Categorical Pretreatment standards or any state requirement.
(Ord. 89, passed 11-22-94) Penalty, see § 51.99
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 and at the expense of the owner.
(Ord. 89, passed 11-22-94) Penalty, see § 51.99
Grease, oil, and sand interceptors shall be provided when, in the opinion of the Wastewater System Operator, they are necessary for the proper handling of liquid wastes containing floatable grease in excessive amounts, as specified in § 51.32(B), any flammable wastes as specified in § 51.31(A), 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 the type to be readily and easily accessible for cleaning and inspection. In the maintaining of these interceptors, the owner shall be responsible for the proper removal and disposal of the captured materials by appropriate means, and shall maintain a record of dates and means of disposal which are subject to review by the Wastewater System Operator. Any removal and hauling of the collected materials not performed by the owner’s personnel must be performed by a currently licensed waste disposal firm.
(Ord. 89, passed 11-22-94) Penalty, see § 51.99
Where required by the city, the owner of any property serviced by a building sewer carrying industrial wastes shall install a suitable structure, or control manhole, with such necessary meters and other appurtenances in the building sewer to facilitate observation, sampling, and measurement of wastes. Such structure shall be accessible and safely located, and shall be constructed in accordance with plans approved by the city. The structure shall be installed by the owner at his or her expense and shall be maintained by the owner so as to be safe and accessible at all times.
(Ord. 89, passed 11-22-94) Penalty, see § 51.99
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