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(A) The following described substances, materials, water or wastes shall be limited in discharges to municipal systems to concentrations or quantities which will not harm either sewers, the wastewater treatment works, treatment process or equipment, will not have an adverse effect on the receiving stream and soil, vegetation and ground water, or will not otherwise endanger lives, limb, public property, or constitute a nuisance. The Utilities Superintendent may set limitations lower than limitations established in the regulations below if, in his or her opinion, the more severe limitations are necessary to meet the above objectives. In forming his or her opinion as to the acceptability of wastes, the Utilities Superintendent will give consideration to 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 sewage treatment process, the city's NPDES/SDS permit, capacity of the sewage treatment plant, degree of treatability of wastes in the sewage treatment plant, and other pertinent factors.
(B) The limitations or restrictions on materials or characteristics of waste or wastewaters discharged to the sanitary sewer which shall not be violated without approval of the Utilities Superintendent are as follows:
(1) 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 wastewater treatment plant to have a temperature exceeding 104°F (40°C), or having heat in amounts which will inhibit biological activity in the wastewater treatment works resulting in interference therein.
(2) 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°C 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.
(3) Any quantities of flow, concentrations, or both which constitute a “slug” as defined in § 51.001.
(4) Any garbage not properly shredded, as defined in § 51.001 of this chapter. 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.
(5) Any noxious or malodorous liquids, gases or solids which either singly 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.
(6) Any wastewater with objectionable color not removed in the treatment process such as but not limited to dye wastes and vegetable tanning solutions.
(7) Non-contact cooling water or unpolluted storm, drainage or ground water.
(8) Wastewater containing inert suspended-solids such as but not limited to fullers earth, lime slurries, and lime residues, or of dissolved solids such as but not limited to sodium chloride and sodium sulfate, in quantities that would cause disruption with the wastewater disposal system.
(9) Any radioactive wastes or isotopes of half-life or concentration as may exceed limits established by the Utilities Superintendent in compliance with applicable state or federal regulations.
(10) Any waters or wastes containing the following substances to the degree that any material received in the composite wastewater at the wastewater treatment works is detrimental to treatment process, adversely impacts land application, adversely effects receiving waters, or is in violation of standards pursuant to Section 307(b) of the Act (33 USC 1317(b)): Arsenic, Cadmium, Copper, Cyanide, Lead, Mercury, Nickel, Silver, total Chromium, Zinc and Phenolic compounds which cannot be removed by the city's wastewater treatment system.
(11) Any wastewater which creates conditions at or near the wastewater disposal system which violates any statute, rule, regulation or ordinance of any regulatory agency, or state or federal regulatory body.
(12) Any waters or wastes containing BOD5 or suspended solids of character and quantity that unusual attention or expense is required to handle the materials at the wastewater treatment works, except as may be permitted by specific written agreement subject to the provisions of § 51.094.
(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 § 51.082, or which in the judgement of the Utilities Superintendent may have a deleterious effect upon the wastewater treatment facilities, processes, or equipment, receiving waters 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 amendments thereof;
(3) Require control over the quantities and rates of discharge; and
(4) Require payment to cover the added costs of handling, treating and disposing of wastes not covered by existing taxes or sewer service 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.
No user shall increase the use of process water or, in any manner, attempt to dilute a discharge as a partial or complete substitute for adequate treatment to achieve compliance with the limitations contained in §§ 51.081 and 51.082, or contained in the National Categorical Pretreatment Standards or any state requirements.
Penalty, see § 51.999
Grease, oil, and sand interceptors shall be provided when, in the opinion of the Utilities Superintendent, they are necessary for the proper handling of liquid wastes containing floatable grease in excessive amounts, as specified in § 51.082(B)(2), any flammable wastes as specified in § 51.081(A), sand or other harmful ingredients; except that 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 Utilities Superintendent. Any removal and hauling of the collecting materials not performed by the owner's personnel must be performed by a currently licensed waste disposal firm.
Penalty, see § 51.999
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 necessary meters and other appurtenances in the building sewer to facilitate observation, sampling, and measurement of wastes. The 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 to be safe and accessible at all times.
Penalty, see § 51.999
The owner of any property serviced by a building sewer carrying industrial wastes may, at the discretion of the city, be required to provide laboratory measurements, tests or analyses of waters or wastes to illustrate compliance with this chapter and any special condition for discharge established by the city or regulatory agencies having jurisdiction over the discharge. The number, type and frequency of sampling and laboratory analyses to be performed by the owner shall be as stipulated by the city. The industry must supply a complete analysis of the constituents of the wastewater discharge to assure that compliance with federal, state and local standards are being met. The owner shall report the results of measurements and laboratory analyses to the city at times and in the manner as prescribed by the city. The owner shall bear the expense of all measurements, analyses and reporting required by the city. At those times as deemed necessary, the city reserves the right to take measurements and supplies for analysis by an independent laboratory.
Penalty, see § 51.999
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, duration and frequencies are to be determined on an individual basis subject to approval by the Utilities Superintendent.
Penalty, see § 51.999
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