A. High Temperature. Heat in amounts which may inhibit biological activity in the POTW resulting in interference, but in no case heat in such quantities that the temperature at the POTW treatment plant exceeds forty degrees centigrade (one hundred four degrees Fahrenheit) unless the approval authority, upon request of the POTW, approves alternate temperature limits.

B. Pollutants which cause corrosive structural damage to the POTW, but in no case discharges with a pH lower than 5.0 or higher than 10.5, or having a pH which will cause damage to the collection system or interfere with POTW treatment processes.

C. Pollutants which create a fire or explosion hazard in the POTW, including, but not limited to, waste streams with a closed cup flashpoint of less than one hundred forty degrees Fahrenheit or sixty degrees centigrade using the test methods specified in 40 CFR 261.21. 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 a fire or explosion or endanger public safety or interfere with the operation of the POTW.

At no time shall two successive readings on an explosion hazard meter, at the point of discharge into the sanitary sewer (or at any point in the system), be more than five percent or any single reading over ten percent of the lower explosive limit (L.E.L.) of the meter, or have a closed-cup flash point of less than one hundred forty degrees Fahrenheit or sixty degrees centigrade using the test methods specified in 40 CFR 261.21. 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 any other substances which the city, the state and EPA has identified as a fire hazard or a hazard to the system.

D. Obstruction of Flow. Solids or viscous pollutants in amounts which will cause obstruction to the flow in a community sewer or in the POTW resulting in interference. Items such as but not limited to grease, garbage with particles greater than one-half inch (one and twenty-seven hundredths centimeters) in any dimension, animal guts or tissues, paunch manure, bones, hair, hides, fleshing, entrails, whole blood, feathers, ashes, cinders, wax, sand, spent lime, stone or marble dust, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, waste paper, wood, plastics, tar, asphalt residues, residues from refining or processing of fuel or lubrication oil, mud or glass grinding or polishing wastes.

E. Toxic Pollutants. Any wastewater containing toxic pollutants in sufficient quantity, either singly or in interaction with other pollutants, that would pass through or cause interference with the wastewater treatment process, or constitute a hazard to human, animal or plant life, including aquatic organisms, or create any hazards in the waters receiving the wastewater treatment plant effluent.

A toxic pollutant shall include but not be limited to any pollutant identified pursuant to Section 307(a) of the Act and the California Toxics Rule. Compounds specifically prohibited include any polychlorinated biphenyl (PCB), any pesticide (including any insecticides, herbicides, or fungicides) such as but not limited to chlordane, heptachlor, heptachlor epoxide, aldrin, dieldrin, dichlorodiphenyl trichloro ethane (DDT), dichloro-diphenyldichloro ethene (DDE), and rothane (DPD).

F. Noxious or Malodorous Substances. Any harmful or offensive gases or solids which either singly or by interaction with other wastes are sufficient to violate or have the potential to cause violations of air quality standards at the POTW or in community sewers, create a public nuisance or hazard to life or are sufficient to prevent entry into the sewers for maintenance and repair. Any volatile organic pollutant in such concentration that it has the potential to cause the headspace gases to exceed a three hundred hexane equivalent level over equilibrated wastewater or exceed toxicity discharge screening levels based on fume toxicity.

G. Disposal/Reclamation. 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 a violation of the 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 or local criteria applicable to the sludge disposal.

H. POTW Violation. Any pollutant including oxygen demanding pollutants (BOD, etc.) causing the POTW to violate or continue to violate its NPDES permit. This includes but is not limited to slug discharges, oxygen demanding pollutants (BOD or COD), suspended solids, pH, heavy metals, oil and greases or toxic organic compounds; released in a discharge at a flow rate and/or pollutant concentration which will cause interference with the POTW.

I. Detrimental Environmental Impact. Any substance which may have a harmful environmental impact or create a nuisance in the waters of the state or a condition which violates the rules and regulations of any public agency having regulatory jurisdiction over the city, including but not limited to any statute or any rule, regulation, or requirement of any public agency or state or federal regulatory body.

J. Discoloration. Any wastewater creating discoloration or any other condition in the quality of the POTW effluent such that receiving water quality requirements established by law cannot be met.

K. Hazard or Public Nuisance. Any waste which, as determined by the city, may have an adverse or harmful effect on sewer, maintenance personnel, wastewater treatment plant personnel or equipment, treatment plant effluent quality, public or private property or may otherwise endanger the public, the local environment or create a public nuisance. The city shall, in determining the acceptability of specific wastes, consider the nature of the waste and the adequacy of the collection, treatment and disposal system available to accept the waste.

L. Excessive Flow. Total quantities of flow or instantaneous peaks which due to volume or manner of delivery require a disproportionate share of the city’s treatment plant capacity. This also includes flows which, alone or in combination with others, cause excessive treatment costs and/or treatment plant process upsets.

M. Radioactive Wastes. No user shall, and it shall be unlawful to, discharge, cause to be discharged, or permit to be discharged, any radioactive waste into the sanitary sewer, except:

N. Petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin in amounts that will cause interference or pass through.

O. Pollutants which result in the presence of toxic gases, vapors, or fumes within the POTW in a quantity that may cause acute worker health and safety problems.

P. Any trucked or hauled pollutants, except at discharge points designated by the POTW.

Q. Any sewage not amenable to treatment as this term is defined herein with the use of the facilities and treatment processes employed by the city at the time of the discharge.