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<br />Stormwater and all other unpolluted drainage shall be discharged to such sewers as are
<br />specifically designed as storm sewers or to a natural outlet approved by the City and other
<br />regulatory agencies. It is unlawful to connect such sources of unpolluted drainage to any sanitary
<br />sewer. Industrial cooling water or unpolluted process waters may be discharged to a storm sewer
<br />or natural outlet on approval of the City and upon approval and the issuance of a discharge permit
<br />by the MPCA.
<br />
<br />3) Prohibited Discharge. It is unlawful for any person to discharge or
<br />cause to be discharged any of the following described waters or wastes to any public sewers:
<br />
<br />a) Any liquids, solids, or gases which by reason of their nature
<br />or quantity are, or may be, sufficient either alone or by interaction with other substances to cause
<br />fire or explosion or be injurious in any other way to the wastewater disposal system or to the
<br />operation of the system. Prohibited materials include, but are not limited to, gasoline, kerosene,
<br />naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, hydrides,
<br />sulfides, chi orates, perchlorates, bromates, carbides and radioactive wastes.
<br />
<br />b) Solid or viscous substances which will cause obstruction to
<br />the flow in a sewer or other interference with the operation of the wastewater treatment facilities
<br />such as, but not limited to, oils, wax or fats in excess of 100 mwl, garbage with particles greater
<br />than one-half (V2) inch in any dimension, animal guts or tissues, paunch manure, bones, hair or
<br />fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble dust,
<br />metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, waste paper, wood,
<br />plastic, asphalt residues, residues from refining or processing of fuel or lubricating oil, mud or
<br />glass grinding or polishing wastes.
<br />
<br />c) Any wastewater having a pH of less than 5.0 or greater than
<br />9.5 or having any other corrosive property capable of causing damage or hazard to structure,
<br />equipment, and personnel of the wastewater disposal system.
<br />
<br />d) Any wastewater containing toxic pollutants in sufficient
<br />quantity, either singly or by interaction with other pollutants, to inhibit or disrupt any wastewater
<br />treatment process, constitute a hazard to humans or animals, or create a toxic effect in the
<br />receiving waters of the wastewater disposal system. A toxic pollutant shall include but not be
<br />limited to any pollutant identified pursuant to Section 307(a) of the Act.
<br />
<br />e) Any wastewater having a temperature greater than 1500
<br />(65.60C), or causing, individually or in combination with other wastewater, the influent at the
<br />wastewater treatment plant to have a temperature exceeding 1040P (400C), or having heat in
<br />amounts which will inhibit biological activity in the wastewater treatment works resulting in
<br />interference therein.
<br />
<br />f) Any noxious or malodorous liquids, gases, or solids which
<br />either singly or by interaction with other wastes are capable of creating a public nuisance or
<br />hazard to life, or are sufficient to prevent entry into the sewers for their maintenance and repair.
<br />
<br />g) Any wastewater with objectionable color not removed in the
<br />treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions.
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