§ 58-81. General discharge prohibitions.

(a)

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 a WWTP. These general prohibitions apply to all such users of a WWTP, whether or not the user is subject to national categorical pretreatment standards or requirements. A user may not contribute the following substances to a WWTP:

(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 any other substances to cause fire or explosion or be injurious in any other way to a WWTP or to the operation of a WWTP. At no time shall two 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 percent, nor any single reading over ten percent of the lower explosive limit (LEL) of the meter. Prohibited materials include, but are not limited to, gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides and sulfides, and other substances which the director, 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 a WWTP such as, but not limited to, grease, garbage with particles greater than one-half inch in any dimension, animal guts or tissues, 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 waters or wastes having a stabilized pH lower than 6.0 or higher than 9.0, or having other corrosive property capable of causing obstruction, damage or hazard to structures, equipment or personnel of the sewage works, except as specifically permitted by separate written agreements with the county. Materials subject to this prohibition include concentrated chloride and fluoride compounds, and substances which will react with water to form acidic products.

(4)

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, or create a toxic effect in receiving waters of a WWTP.

(5)

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

(6)

Any substance which may cause a WWTP's effluent or any other product of a WWTP 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 WWTP cause a WWTP to be in noncompliance with sludge use or disposal criteria, guidelines or regulations affecting sludge use or disposal developed pursuant to the Solid Waste Disposal Act, or state criteria applicable to the sludge management method being used.

(7)

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

(8)

Any wastewater having objectionable color which is not removable in a WWTP.

(9)

Any wastewater having a temperature which will inhibit biological activity in a WWTP resulting in interference, but in no case wastewater with a temperature at the introduction into a WWTP which exceeds 40 degrees Celsius (104 degrees Fahrenheit), unless the district receives approval for and sets alternative temperature limits, or a temperature at the introduction into the wastewater treatment system which exceeds 65 degrees Celsius (150 degrees Fahrenheit).

(10)

Any pollutant released in an indirect discharge at a flow rate and/or pollutant concentration which will cause interference to a WWTP.

(11)

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

(12)

Any water of stormwater origin which increases the hydraulic load on a WWTP by an amount measurable by normal methods, or any unpolluted water or wastewater released at a rate which will cause surcharging of the sanitary sewer.

(13)

Any clothing, rags, textile remnants or waste, cloth scraps, except fibers or scrap that will pass through a one-fourth-inch mesh screen or its equivalent in screening ability.

(b)

When the director determines that a user is contributing to a WWTP any of the substances enumerated in subsection (a) of this section in such amounts as to interfere with the operation of a WWTP, the director shall:

(1)

Advise the user of the impact of the contributions on a WWTP; and

(2)

Develop effluent limitations for such user to correct the interference with a WWTP.

(c)

Upon satisfactory presentation to the director of evidence by a user that a variance of one or more of the substances enumerated in subsection (a) of this section is warranted, the director may, after review of such evidence, permit the user to discharge an effluent in quantity or quality not consistent with the limitations set forth in this section. Such permission shall be granted by the director only after suitable arrangements and fees have been established and set forth in the user's wastewater discharge permit.

(Ord. of 6-1-92(2), § 2(1))