§ 36-25. Use of the public sewers.

(a)

In all cases where the building is equipped with eavestroughs or other means for the collection of roof water, the downspouts and/or roof water conductor pipes shall be discharged on the ground or paved surface at a distance of at least 36 inches from the building wall, unless otherwise approved by the building inspector.

(1)

The grade line at the building wall in all cases shall be such that the slope is away from the wall at the rate of at least one-quarter inch per foot. In cases where settlement of the ground has occurred at the building wall, it shall be the responsibility of the property owner to add fill to correct the condition to conform with the above slope requirement.

(2)

There shall be no direct connection from the window wells to the foundation drain.

(3)

Basement perimeter tile, or footing drains, shall not be connected to sanitary sewers.

(4)

The community shall have the right to reject wastes which are harmful to the system and, if acceptable to the system, the right to charge a surcharge for high-strength wastes.

(5)

The above requirements shall apply to all sanitary sewers, combined sewers and storm sewers in the city.

(b)

Industrial cooling water or unpolluted process waters may and shall be discharged to a storm sewer or natural outlet, as directed by the state department of environmental quality.

(c)

Except as hereinafter provided, no person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewer:

(1)

Any liquid or vapor having a temperature higher than 150½ degrees Fahrenheit.

(2)

Any wastes containing grease, oils, fats, or other substances that will solidify or become viscous at temperatures between 30 degrees Fahrenheit and 150 degrees Fahrenheit.

(3)

Any gasoline, benzene, naphtha, fuel oil or other flammable or explosive liquid, solid, or gas.

(4)

Any garbage that has not been properly shredded.

(5)

Any 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.

(6)

Any waters or wastes having a pH lower than 6.5 or higher than 9.5, or having any other corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the sewage works.

(7)

Any waters or wastes containing a toxic or poisonous substance in sufficient quantity to injure or interfere with any sewage treatment process, constitute a hazard to humans or animals, or cause the treatment works to exceed its NPDES permit, or create any hazard in the receiving waters of the sewage treatment plant.

(8)

Any 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.

(9)

Any noxious or malodorous gas or substance capable of creating a public nuisance.

(10)

Any future clearwater connections.

(d)

Grease, oil and sand interceptors shall be provided when, in the opinion of the superintendent, 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 interceptors shall be of a type and capacity approved by the superintendent and shall be located as to be readily and easily accessible for cleaning and inspection.

(1)

Grease and oil interceptors shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature.

(2)

They shall be of substantial construction, watertight and equipped with easily removable covers which when bolted in place shall be gastight and watertight.

(e)

Where installed, all grease, oil, and sand interceptors shall be maintained by the owner at his expense, in continuously efficient operation at all times.

(f)

The admission into the public sewers of any waters or wastes having:

(1)

A five-day biochemical oxygen demand greater than 250 parts per million;

(2)

Containing more than 200 parts per million of suspended solids;

(3)

Containing more than 30 parts per million of ammonia-nitrogen;

(4)

Containing more than ten parts per million of phosphorus;

(5)

Containing any quantity of substances having the characteristics described in subsection (c) of this section; or

(6)

Having an average daily flow greater than two percent of the average daily sewage flow of the city;

shall be subject to review and approval by the city council.

(g)

Where necessary, in the opinion of the city council, the owner shall provide, at his expense, such preliminary treatment as may be necessary to:

(1)

Reduce the biochemical oxygen demand to 250 parts per million, the suspended solids to 200 parts per million, the ammonia nitrogen to 30 parts per million, and/or the total phosphorus to ten parts per million;

(2)

Reduce objectionable characteristics or constituents to within the maximum limits provided for in subsection (c) of this section; or

(3)

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 city council and of the water resources commission of the state, and on construction of such facilities shall be commenced until such approvals are obtained in writing.

(h)

Where preliminary treatment facilities are provided for any waters or wastes, they shall be maintained continuously in satisfactory and effective operation by the owner at his expense.

(i)

When required by the city council, the owner of any property served by a sewer connection carrying industrial wastes shall install a suitable control manhole in the sewer connection to facilitate observation, sampling, and measurement of the wastes. Such manhole, when required, shall be accessible and safely located and shall be constructed in accordance with plans approved by the city council. The manhole shall be installed by the owner at his expense and shall be maintained by him so as to be safe and accessible at all times.

(j)

All measurements, tests and analysis of the characteristics of waters and wastes to which reference is made in subsections (c) and (f) of this section shall be determined in accordance with Standard Methods for the Examination of Water and Wastewater or 40 CFR 136, and shall be determined at the control manhole provided for in subsection (h) of this section, or upon suitable samples taken at the control manhole. In the event that 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 sewer connection is made.

(k)

No statement contained in this section shall be construed as preventing any special agreement or arrangement between the city and any concern whereby waste of unusual strength or character may be accepted by the city for treatment, subject to payment therefor by the industrial concern. Prohibition of toxic pollutants will conform to section 307(a) of the Clean Water Act.

(l)

Sanitary sewers shall be designed in accordance with the Recommended Standards for Sewage Works, latest edition. This is also known as the Ten State Standard.

(Code 1992, § 21-57; Ord. No. 267, § 4, 2-2-1989)