§ 700.07. Regulations governing use of the public sewers.

Subdivision 1. Unlawful use. No person may discharge or cause to be discharged any stormwater, surface water, groundwater, roof runoff, subsurface drainage, cooling water or unpolluted industrial process waters to any sanitary sewer.

Subd. 2. Stormwaters and unpolluted drainage. Stormwater and all other unpolluted drainage shall be discharged into sewers specifically designed as storm sewers, or to a natural outlet approved by the Council. Industrial cooling water or unpolluted industrial process waters may be discharged, upon Council approval to any storm sewer or natural outlet.

Subd. 3. Prohibited discharge. Except as hereinafter provided no person may discharge or cause to be discharged any of the following described waters or wastes to any public sewer:

(a)

Liquid or vapor having a temperature higher than 150 degrees F;

(b)

Water or waste which may contain more than 100 parts per million, by weight, of fat, oil, or grease;

(c)

Gasoline, benzine, naphtha, fuel oil, or other flammable or explosive liquid, solid or gas;

(d)

Garbage that has not been properly shredded;

(e)

Ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, paunch manure, or any other solid or viscous substance capable of causing obstruction to the flow in sewers or other interference with the proper operation of the sewage works;

(f)

Waters or wastes having a pH lower than 5.5 or higher than 9.0 or having any other corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the sewage works;

(g)

Waters or wastes containing a toxic or poisonous substance in sufficient quantity to inquire or interfere with any sewage treatment process, which constitute a hazard to humans or animals, or create any hazard in the receiving waters of the sewage treatment plant;

(h)

Waters or wastes containing suspended solids of such character and quantity that unusual attention or expense is required to handle such materials at the sewage treatment plant;

(i)

Noxious or malodorous gases or substances capable of creating a public nuisance.

Subd. 4. Grease, oil and sand interceptors. Grease, oil and sand interceptors shall be provided when they are necessary for the proper handling of liquid wastes containing grease in excessive amounts or any flammable wastes, sand, and other harmful ingredients; except that such interceptors shall not be required for private living quarters or dwelling units. All such interceptors shall be of a type and capacity approved by the Director of Community Services, and shall be located as to be readily and easily accessible for cleaning and inspection. Grease and oil interceptors shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature. They shall be of substantial construction, watertight, and equipped with easily removable covers which when bolted in place shall be gastight and watertight. Where installed, all grease, oil and sand interceptors shall be maintained by the owner, at his expense, in continuously efficient operation at all times.

Subd. 5. Certain types of uses: approval. The admission into the public sewers of any water or wastes having:

(i)

A five-day Biochemical Oxygen Demand greater than 300 parts per million by weight; or

(ii)

Containing more than 350 parts per million by weight of suspended solids; or

(iii)

Containing any quantity of substances having characteristics described in subdivision 3; or

(iv)

Having an average daily flow greater than two percent (2%) of the average daily sewage flow of the City is subject to the review and approval of the Director of Community Services.

Subd. 6. Preliminary treatment: when required. The owner shall provide, at his expense, such preliminary treatment as may be necessary to:

(i)

Reduce the biochemical oxygen demand to 300 parts per million and the suspended solids to 350 parts per million by weight; or

(ii)

Reduce objectionable characteristics of constituents to within the maximum limits provided for in subdivision 3; or

(iii)

Control the quantities and rates of discharge of such waters or wastes.

Plans, specifications, and any other pertinent information relating to proposed preliminary treatment facilities shall be submitted for the approval of the Director of Community Services and the Minnesota Pollution Control Agency, and no construction of such facilities may be commenced until approvals are obtained in writing.

Subd. 7. Maintenance of preliminary treatment facilities. Where preliminary treatment facilities are provided for waters or wastes, they shall be maintained continuously in satisfactory and effective operation, by the owner at the owner's expense.

Subd. 8. Manholes. The owner of property served by a building sewer carrying industrial wastes shall install a suitable control manhole in the building sewer to facilitate observation, sampling and measurement of the wastes. The manhole, when required, shall be accessibly and safely located, and constructed in accordance with plans approved by the Director of Community Services. The manhole shall be installed by the owner, at his expense, and maintained by him so as to be safe and accessible at all times.

Subd. 9. Tests and analysis. All measurements, tests and analyses of the characteristics of waters and wastes to which reference is made in subdivisions 3 and 5 of this subsection shall be determined in accordance with methods employed by the Minnesota Department of Health, and shall be determined at the control manhole provided for in subdivision 8 of this subsection, or upon suitable samples taken at said control manhole. If no special manhole has been required, the control manhole shall be considered to be the nearest downstream manhole in the public sewer to the point at which the building sewer is connected.

Subd. 10. Special provisions: industrial waste. This subsection shall not 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 subject to payment therefor by the industrial concern.