(a) No person shall discharge or cause to be discharged any stormwater, surface water, ground water, roof runoff, subsurface drainage, cooling water, swimming pool water or unpolluted industrial process waters to any sanitary sewer.
(b) Stormwater and all other unpolluted drainage shall be discharged to the sewers as are specifically designated as storm sewers, or to a natural outlet approved by the City Engineer. Industrial cooling water or unpolluted process waters shall be discharged upon written approval of the Engineer to a storm sewer or natural outlet.
(c) No person shall discharge, or cause to be discharged any waste to a public sewer which exceeds the city’s maximum allowable wastewater discharge limits as provided by the Public Utilities Director. 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 160°F;
(2) Any water or waste which may contain more than 100 milligrams per liter of fat, oil, blood or grease at any given time, based on a grab sample;
(Ord. 94-137, passed 12-12-1994)
(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 viscuous 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 6.0 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 create any hazard in the receiving waters of the water reclamation plant;
(8) Any waters or wastes containing suspended solids of the character and quantity that unusual attention or expense is required to handle the materials at the sewage disposal plant; and
(9) Any noxious or malodorous gas or substance capable of creating a public nuisance.
(d) (1) Grease, oil and sand traps shall be provided when, in the opinion of the Public Utilities Director, they are necessary for the proper handling of liquid wastes containing grease in excessive amount, or any flammable wastes, sand and other harmful ingredients; except that the traps shall not be required for private living quarters or dwelling units. All traps shall be of a type and capacity approved by the Director and shall be located so as to be readily and easily accessible for cleaning and inspection.
(2) Grease and oil traps 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.
(e) Where installed, all grease, oil and sand traps shall be maintained by the owner, at his or her expense, in continuously efficient operation at all times, cleaned and disposed of properly as approved by the Public Utilities Director.
(f) Where sewer connections are made to a building not being served by the city water system, devices for measuring the sewage flow satisfactory to and approved by the Public Utilities Director shall be installed by the owner at no expense to the city.
(Ord. 90-61, passed 5-14-1990)
(g) (1) The admission into the public sewers of any waters or wastes:
A. Having a five-day biochemical oxygen demand greater than 175 parts per million by weight;
B. Containing more than 175 parts per million by weight of suspended solids;
C. Containing more than 15 parts per million of ammonia;
D. Containing any quantity of substances having the characteristics described in division (c) hereof; or
E. Having an entire average daily flow greater than 5% of the average daily sewage flow of the city, shall be subject to the review and approval of the Public Utilities Director.
(2) Where necessary in the opinion of the Director, the owner shall provide at his or her expense the preliminary treatment as may be necessary to:
A. Reduce the biochemical oxygen demand to 500 parts per million, the suspended solids to 600 parts per million, and reduce the ammonia to 20 parts per million by weight and be charged a premium rate which will be established at the time the strength and/or quantity of the sewage is determined, for treating more than 175 parts per million by weight of BOD or containing more than 175 parts per million by weight of suspended solids or containing more than 15 parts per million by weight of ammonia, premium rate to be in addition to the rate as established in § 942.08;
B. Reduce objectionable characteristics or constituents to within the maximum limits as provided in division (c) hereof; or
C. Control the quantities and rates of discharge of the waters or wastes.
(3) Plans, specifications and any other pertinent information relating to proposed preliminary treatment facilities shall be submitted for the approval of the Director and of the State Environmental Protection Agency, and no construction of the facilities shall be commenced until approval is 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 or her expense.
(i) When required by the Public Utilities Director, the owner of any 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 shall be constructed in accordance with plans approved by the Director. The manhole shall be installed by the owner at his or her expense, and shall be maintained by him or her so as to be safe and accessible at all times.
(j) All measurements, tests and analyses of the characteristics of waters and wastes to which reference is made in divisions (c) and (g) hereof shall be determined in accordance with the latest edition of Standard Methods for the Examination of Water and Sewage as published by the American Public Health Association and shall be determined at the control manhole provided for in division (i) hereof or upon suitable samples taken at the control manhole. In the event that no special manhole has been required, the control manholes shall be considered to be the nearest upstream and downstream manholes in the public sewer to the point at which the sewer is connected.
(Ord. 92-48, passed 5-26-1992)
(k) No statement contained in this chapter shall be construed as preventing any special agreement or arrangement between Council 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.
(Ord. 90-61, passed 5-14-1990)