§ 25-120. General prohibitions.

No user shall contribute or cause to be contributed, directly or indirectly, any pollutant or wastewater which will interfere with the operation or performance of the POTW. These general prohibitions apply to all such users of a POTW whether or not the user is subject to national categorical pretreatment standards or any other national, state, or local pretreatment standards or requirements. A user may not contribute the following substances to the POTW without first obtaining a written permit from the city for same.

(1)

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 POTW or to the operation of the POTW. 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 (5) percent nor any single reading over ten (10) percent of the lower explosive limit (LEL) of the meter. Prohibited materials include, but are not limited to, gasoline, fuel oil, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides and sulfides and any other substances which the city, the state or EPA has notified the user is a fire hazard or a hazard to the system.

(2)

Solid or viscous substances which 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 in any dimension, animal guts or tissue, 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, wastepaper, wood, plastics, gas, tar, asphalt residues, residues from refining or processing of fuel or lubricating oil, mud, or glass grinding or polishing wastes.

(3)

Any wastewater having a pH less than 5.0 or greater than 10.0, or wastewater having any other corrosive property capable of causing damage or hazard to structures, equipment, and/or personnel of the POTW.

(4)

Wastewater containing more than twenty-five (25) mg/l of petroleum oil, nonbiodegradable cutting oils, or product of mineral oil origin.

(5)

Wastewater from industrial plants containing floatable oils, fat or grease.

(6)

Any wastewater containing toxic pollutants in sufficient quantity, either singly or by interaction with other pollutants, to injure or interfere with any wastewater treatment process, constitute a hazard to humans or animals, create a toxic effect in the receiving waters of the POTW, or to exceed the limitation set forth in a categorical pretreatment standard. Toxic pollutants include but are not limited to section 307 (a) of the act. In addition to limitations included in any applicable categorical pretreatment standard, the following toxic pollutant concentrations shall not be exceeded:

0.1 mg/l arsenic

0.1 mg/l cadmium

0.2 mg/l copper

0.6 mg/l cyanide

0.05 mg/l lead

0.05 mg/l mercury

1.0 mg/l nickel

0.05 mg/l silver

0.25 mg/l total chromium

0.5 mg/l zinc

(7)

Any noxious or malodorous liquids, gases, or solids which either singly or by interaction with other wastes are sufficient to create a public nuisance or hazard to life or are sufficient to prevent entry into the sewers for maintenance and repair.

(8)

Any substance which may cause the POTW's effluent or any other product of the POTW such as residues, sludges, or scums, to be unsuitable for reclamation and reuse or to interfere with the reclamation process. In no case, shall a substance discharged to the POTW cause the POTW to be in noncompliance with sludge use or disposal criteria, guidelines or regulations developed under section 405 of the act; any criteria, guidelines, or regulations affecting sludge use or disposal developed pursuant to the solid waste disposal act, the clean air act, the toxic substances control act, or state criteria applicable to the sludge management method being used.

(9)

Any substance which will cause the POTW to violate its NPDES and/or state disposal system permit or the receiving water quality standards.

(10)

Any wastewater with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions.

(11)

Any wastewater having a temperature which will inhibit biological activity in the POTW treatment plant resulting in interference, but in no case wastewater with a temperature at the introduction into the public sewer which exceed sixty-five (65) degrees centigrade (one hundred fifty (150)° Fahrenheit) and/or with a temperature at the POTW treatment plant which exceeds forty (40) degrees centigrade (one hundred four (104)° Fahrenheit). If, in the opinion of the city manager, the temperature of a waste can harm either the sewers, wastewater treatment process, or equipment, have an adverse effect on the receiving stream, or can otherwise endanger life, limb, public property, or constitute a nuisance, the city manager may prohibit or condition such discharges to the POTW.

(12)

Any pollutants, including oxygen-demanding pollutants (BOD, etc.) Released at a flow rate and/or pollutant concentration which will cause interference to the POTW. In no case shall a slug load have a flow rate or contain concentration or qualities of pollutants that exceed for any time period longer than fifteen (15) minutes [more] than five (5) times the average twenty-four-hour concentration, quantities, or flow from the user during normal operation; except that the city manager may allow slug loads to be discharged at specified times and under specified conditions. Such discharge shall not be allowed unless approved by the city manager.

(13)

Any wastewater containing any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the city manager in compliance with applicable state or federal regulations.

(14)

Any wastewater which causes a hazard to human life or creates a public nuisance.

(Ord. No. 10574, § 2.5, 6-20-83; Ord. No. 10911, § 1, 4-2-90; Ord. No. 11020, § 3, 2-17-92; Ord. No. 11496, 5-7-2001)