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 or cause a pass- through to the receiving stream. These general prohibitions apply to all such users of the 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 any of the following substances to the city's POTW:
(1) 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 POTW which exceeds 40 degrees Celsius (104 degrees Fahrenheit), or lower than -1 degree Celsius (30 degrees Fahrenheit), unless the POTW treatment plant is designed to accommodate such temperature.
(2) Any wastewater or waste which may contain more than 100 mg/l of fat, oil or grease.
(3) 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 hazard in the POTW, including, but not limited to, waste streams with a closed cup flashpoint of less than 140 degrees Fahrenheit (60 degrees Celsius) using the test methods specified in 40 CFR 261.21, or be injurious in any other way to the POTW or the operation of the POTW. At no time shall two successive readings on any 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:
a. Gasoline;
b. Kerosene;
c. Naphtha;
d. Benzene;
e. Toluene;
f. Xylene;
g. Ethers;
h. Alcohols;
i. Ketones;
j. Aldehydes;
k. Peroxides;
l. Chlorates;
m. Perchlorates;
n. Bromates;
o. Carbides;
p. Hydrides;
q. Sulfides; and
r. Any other substance which the city, the state or EPA has notified the user as a fire hazard or a hazard to the system.
(4) 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 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, petroleum oil, non- biodegradable cutting oil, or products of mineral oil origin in amounts that will cause interference or pass-through.
(5) Any wastewater having a pH lower than 6.0 or higher than 10.5, or having any other corrosive property capable of causing damage or hazard to structures, equipment and/or personnel of the POTW, unless the POTW is specifically designed to accommodate such wastewater.
(6) Any wastewater containing toxic pollutants in sufficient quantity, either singularly 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 exceed the limitations set forth in a categorical pretreatment standard. The toxic pollutants shall include but are not limited to any pollutant identified pursuant to Section 307(a) of the Act.
(7) Any wastewater containing pollutants which, either singularly or by interaction with other wastes, result in the presence of toxic gases, vapors or fumes within the POTW in a quantity that may cause acute worker health or safety problems.
(8) Any wastewater with objectionable color not removed in the treatment process, such as but not limited to dye wastes and vegetable tanning solutions.
(9) Any wastewater containing any radioactive waste or isotopes of such half-life or concentration as may exceed limits established by state or federal regulations.
(10) Any wastewater where batch discharge containing industrial processing wastes in excess of standards established by state or federal regulation or containing such substances as may impair the sanitary sewage treatment process or cause a deviation from the NPDES permit requirements, pretreatment standards, and all state and federal regulations.
(11) Any wastewater containing suspended solids of such character or quantity that unusual attention or expense is required to handle such materials at the POTW.
(12) Any wastewater which causes a hazard to human life or creates a public nuisance.
(13) Any substance which will cause the POTW to violate its NPDES and/or state disposal system permit or the receiving water quality standards.
(14) Any pollutants, including oxygen-demanding pollutants (BOD, and the like) released at a flow rate and/or pollutant concentration which a user knows or has reason to know will cause interference to the POTW. In no case shall a slug load lasting longer than 15 minutes have a flow rate, concentration or qualities of pollutants that exceed more than five times the average 24-hour concentration, quantities, or flow during normal operation.
(15) Any substance which may cause the POTW effluent or other product of the POTW such as residues, sludges or scums to be unsuitable for reclamation and reuse, or interferes with the reclamation process.
(16) Any trucked or hauled pollutants, except at discharge points designated by the Authority.
(Ord. No. 144, 5-16-2005)