No user shall discharge or cause to be discharged, directly or indirectly, any of the substances described in this section into the wastewater disposal system or to any public sewer:
A. Explosive Gases: 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 disposal system or to the operation of the system. At no time, shall two (2) successive readings on an explosion hazard meter, at the point of discharge into the system or at any point in the system, be more than five percent (5%) nor any single reading over ten percent (10%) of the lower explosive limit (LEL) of the meter. 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. Grease, Garbage, Etc.: Solid or viscous substances which will or may 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, grease, garbage with particles greater than one-half inch (1/2") in any dimension, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble dust, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, waste paper, wood, plastic, gas, tar, asphalt residues, residues from refining or processing of fuel or lubricating oil, mud or glass grindings or polishing wastes.
C. Hazardous Fluids: Any wastewater having a pH less than 5.0 or higher than 9.0 or having any other corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the wastewater disposal system.
D. Toxic Pollutants: Any wastewater containing toxic pollutants in sufficient quantity, either singly or by interaction with other pollutants to inhibit or disrupt any wastewater treatment process, constitutes a hazard to humans or animals, or create a toxic effect in the receiving waters of the wastewater disposal system. A toxic pollutant shall include, but not be limited to, any pollutant identified pursuant to section 307(a) of the act.
E. Noxious Fluids: 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 sewer for their maintenance and repair.
F. Dyes, Etc.: Any wastewater with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions.
G. Other Violations: Any wastewater which creates conditions at or near the wastewater disposal system which violate any statute or any rule, regulation or section of any public agency or state or federal regulatory body.
H. Heated Wastewater: Any wastewater having a temperature greater than one hundred fifty degrees Fahrenheit (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 one hundred four degrees Fahrenheit (104°F) (40°C) or having heat in amounts which will inhibit biological activity in the treatment works resulting in interference.
I. Slug Loads: Any slug load, which shall mean any pollutant, including oxygen demanding pollutants (BOD, etc.) released in a discharge of such volume or strength as to cause inhibition or disruption in the wastewater disposal system. In no case shall a slug load have a flow rate or contain concentrations or quantities of pollutants that exceed for any time period longer than fifteen (15) minutes more than five (5) times the average twenty four (24) hour concentrations, quantities, or flow of the user during normal operation.
J. Unpolluted Water: Any unpolluted water, including, but not limited to, noncontact cooling water, unpolluted storm or ground water.
K. Excess Grease And Oil: Any wastewater containing fats, wax, grease, or oils of animal or vegetable origin whether emulsified or not, in excess of plus one hundred fifty milligrams per liter (+150 mg/l) or containing substances which may solidify or become viscous at temperatures between thirty two degrees Fahrenheit and one hundred fifty degrees (32°F and 150°F) (0°C and 65.6°C); and any wastewater containing oil and grease concentration of mineral origin of greater than plus one hundred milligrams per liter (+100 mg/l), whether emulsified or not.
L. Inert Suspended Solids: 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 such quantities that they would cause disruption with the wastewater disposal system.
M. Other Prohibited Substances: No user shall discharge to any public sewer any discharge which causes "interference", as defined, with the wastewater disposal system. Pollutants in the effluent from an industrial user shall not be considered to cause interference where the industrial user is in compliance with specific prohibitions or standards developed by federal, state, or local governments. Where the industrial user is in compliance with such specific prohibitions or standards and pollutants in the effluent from the industrial user's facility nevertheless are determined to have caused or significantly contributed to a violation of any requirement of the city's NPDES or state disposal system permit, and are likely to cause such a violation in the future, the BPUC must take appropriate action to develop and enforce specific effluent limits for that industrial user to ensure renewed and continued compliance with the city's NPDES or state disposal system permit.
N. Strong Acid Or Plating Solutions: Any water or wastes containing strong acid, iron pickling wastes, or concentrated plating solutions, whether neutralized or not.
O. Phenols: Any water or wastes containing phenols or other taste or odor producing substances which constitute a nuisance or hazard to the structures, equipment, or personnel of the sewage works, or which interfere with the treatment required to meet the requirements of the state and federal government and any other public agency with proper authority to regulate the discharge from the sewage treatment plan.
P. Radioactive Wastes: Any radioactive wastes or isotopes of such half-life or concentration that they are in noncompliance with regulations issued by the appropriate authority having control over their use or which have caused or may cause damage or hazards to the treatment works or personnel operating it.
Q. Water Insoluble Oils: Any water insoluble oils, including, but not limited to, fuel oil, nonbiodegradable cutting oil, lubricating oil, hydraulic oil, mineral oil and motor oil.
R. Medical Wastes: Whole, ground or shredded glassware, needles and other sharps, plastic and textile objects from hospitals, physician and dentist offices, clinics, veterinary facilities, other healthcare facilities, mortuaries, blood banks, laboratories of any kind and food preparation facilities.
S. Infectious Wastes: Wastes, other than domestic wastes, that are infectious except as provided for in an acceptable infectious waste management plan submitted to Minnesota department of health or Minnesota pollution control agency pursuant to Minnesota statutes 116.75-116.83.
T. Foam Producing: Any material containing foam or foam producing substances in sufficient quantities to cause a public nuisance, operational problems in public sewers or cause interference or pass-through.
U. Pretreatment Solids: Any pretreatment solids from an industrial pretreatment system except as provided in section 8-2-7 of this chapter.
V. Outside Of City Wastes: Any wastes generated outside the city limits, unless prior approval has been obtained from the public works director.
W. Hazardous Wastes: Any hazardous wastes, as defined by Minnesota statutes section 116.06 subdivision 11 and Minnesota rules chapter 7045, unless prior approval has been obtained from the public work director and such discharge does not constitute a violation of local, state or federal law. (2002 Code)