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No industrial user shall discharge any pollutant in a quantity which will harm the health of the city’s employees working in and around the city wastewater system, interfere with the operation or performance of the city wastewater system, or contaminate the resulting sludge, or will pass through the system inadequately treated, into receiving waters, including but not limited to any of the following substances.

(a) Any liquids, solids or gases which by reason of their nature or quantity are, or may be sufficient either alone or in combination with other pollutants to cause fire or explosion or be injurious in any other way to the city wastewater system or its operations, including, but not limited to, gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, prechlorates, bromates, carbides, hydrides and sulfides; wastestreams with a closed cup flashpoint of less than 140 degrees Fahrenheit or 60 degrees Centigrade using the test methods specified by the city manager. At no time shall two successive readings on an explosion hazard meter, at the point of discharge (or at any point in the city wastewater system) be more than five percent nor any single reading over ten percent of the lower explosive limit of the meter.

(b) Pollutants which result in the presence of toxic gases, vapors, or fumes within the city wastewater system in a quantity that may cause acute worker health and safety problems.

(c) Any trucked or hauled pollutants, except at discharge points designated by the city manager.

(d) Solid or viscous substances which either alone or in combination with other pollutants may cause obstruction to the flow in a sewer or other interference with the operation of the city wastewater system 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 or hops, waste paper, wood, plastics, gas, tar, asphalt residues, residues from refining, or processing of fuel or lubricating oil, mud, or glass grinding or polishing wastes.

(e) Any wastewater having a pH less than 5.5 or greater than 12.0 or having any other corrosive property capable of causing damage or hazard to structures, equipment, and/or personnel of the city wastewater system.

(f) Any wastewater containing pollutants which, either alone or in combination with other pollutants, may injure or interfere with any wastewater treatment process, constitute a hazard to humans or animals, creates a toxic effect in the receiving waters of the city wastewater system or exceeds any limitation set forth in a National Categorical Pretreatment Standard or any other pretreatment standard.

(g) Any noxious or malodorous liquid, gas or solid which, either alone or in combination with other pollutants, is sufficient to create a public nuisance or hazard to life or is sufficient to prevent entry into the city wastewater system for maintenance or repair.

(h) Any pollutant which may cause the city wastewater system’s effluent or any other product of the city wastewater system such as residues, sludges, or scums, to be unsuitable for reclamation and reuse or to interfere with the reclamation process.

(i) Any pollutant which will cause the city to violate its NPDES permit.

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

(k) Any wastewater having a temperature which will inhibit biological activity in the treatment plant or stimulate excessive biological activity in the city wastewater system, but in no case wastewater with a temperature at the point of discharge into the city wastewater system which exceeds 65 degrees C (150 degrees F) or with a temperature which exceeds 40 degrees C (104 degrees F) at the regional treatment works plant influent.

(l) Any wastewater containing any radioactive wastes or isotopes of such half life or concentration as may exceed limits established by the city manager or applicable state or federal standards.

(m) Any unpolluted water, including, but not limited to, non-contact cooling water, or stormwater.

(Section 6.511, formerly Section 6.410 added by Ordinance No. 19130, enacted April 13, 1983; amended by Ordinance No. 19406, enacted September 17, 1986; Ordinance No. 19791, enacted July 8, 1991; Ordinance No. 19913, enacted April 26, 1993, effective May 26, 1993; renumbered by Ordinance No. 19939, enacted November 17, 1993, effective December 17, 1993; and amended by Ordinance No. 19940, enacted November 17, 1993, effective December 17, 1993.)