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A. General Prohibitions. No user shall introduce or cause to be introduced into the POTW any pollutant or wastewater which causes pass through or interference. These general prohibitions apply to all users of the POTW whether or not they are subject to Categorical Pretreatment Standards or any other national, State or local pretreatment standards or requirements.

B. Specific Prohibitions. No user shall introduce or cause to be introduced into the POTW the following pollutants, substances or wastewater:

1. Pollutants which create a fire or explosive hazard in the POTW, including, but not limited to, waste streams with a closed-cup flashpoint of less than 140ºF (60ºC) 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 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 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;

2. Wastewater having a pH range of less than 5.0 or more than 10.0 or otherwise causing corrosive structural damage to the POTW or equipment;

3. Solid or viscous substances in amounts which will cause obstruction of the flow in the POTW resulting in interference but in no case solids greater than one-quarter (1/4) inch. Animal guts or tissues, paunch manure, bones, hair, hides or fleshing, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble dusts, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent 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 in amounts that cause interference in the POTW. Fats, oils and grease in amounts that may cause obstructions or maintenance problems in the collection/conveyance system, or interference in the POTW;

4. Pollutants, including oxygen-demanding pollutants (BOD, COD, etc.), released in a discharge at a flow rate and/or pollutant concentration which, either singly or by interaction with other pollutants, will cause interference with the POTW;

5. Wastewater having a temperature which will inhibit biological activity in the treatment plant resulting in interference, but in no case wastewater which causes the temperature at the introduction into the treatment plant to exceed 104ºF (40ºC) unless the approval authority, upon the request of the POTW, approves alternate temperature limits;

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

7. 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;

8. Trucked or hauled pollutants unless authorized by the City, and at discharge points designated by the City;

9. Noxious or malodorous liquids, gases, solids, or other wastewater which, either singly or by interactions with other wastes, are sufficient to create a public nuisance or a hazard to life, or to prevent entry into the sewers for maintenance or repair;

10. Wastewater which imparts color which cannot be removed by the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions, which consequently impart color to the treatment plant’s effluent, or cause a violation of the City’s NPDES permit;

11. Wastewater containing any radioactive wastes or isotopes except as specifically approved by the City in compliance with applicable State or Federal regulations;

12. Stormwater, surface water, ground water, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, de-ionized water, noncontact cooling water, and unpolluted wastewater (except occurring I&I as part of infrastructure that is addressed through regular and routine maintenance), unless specifically authorized by the City;

13. Any sludges, screenings, or other residues from the pretreatment of industrial or commercial wastes or from industrial or commercial processes, except as authorized in writing by the City;

14. Medical wastes, except as specifically authorized in writing by the City;

15. Wastewater causing, alone or in conjunction with other sources, the treatment plant’s effluent to fail a toxicity test. Any wastewater containing toxic pollutants, as referenced in the Act, in sufficient quantity, either singly or by interaction, to injure or interfere with any wastewater treatment process, to constitute a hazard to humans or animals or exceed limitations set forth in the national Categorical Pretreatment Standards, State standards or specific City limitations;

16. Detergents, surface-active agents, or other substances in amounts which may cause excessive foaming in the POTW;

17. Any substance which will cause the POTW to violate its NPDES and/or other disposal system permits;

18. Any wastewater which in the opinion of the City can cause harm either to the sewers, sewage treatment process, or equipment; have an adverse effect on the receiving stream; or can otherwise endanger life, limb, public property, or constitute a nuisance, unless allowed under special agreement by the City (except that no special waiver shall be given from Categorical Pretreatment Standards);

19. The contents of any tank or other vessel owned or used by any person in the business of collecting or pumping sewage, effluent, septage, or other wastewater unless said person has first obtained approval from the City, completed any sampling as may be required by the City and paid all fees assessed for being allowed to discharge;

20. Any hazardous or dangerous wastes as defined in rules published by the State of Washington (Chapter 173-303 WAC) and/or in EPA Rule 40 CFR Part 261;

21. Persistent pesticides and/or pesticides regulated by the Federal Insecticide Fungicide Rodenticide Act (FIFRA);

22. Any slug load;

23. Any substance which may cause the POTW’s effluent or treatment residues, biosolids, sludges, or scums to be unsuitable for reclamation and reuse, or to interfere with the reclamation process;

24. The use of the treatment and controls located at the POTW for wastewater treatment required by a National Emission Standard for Hazardous Air Pollutants for Source Categories (NESHAP) under 40 CFR Part 63 is prohibited. The discharge of any untreated wastewater regulated by a NESHAP also is prohibited. The POTW does not and will not accept a NESHAP regulated waste stream nor provide treatment or controls as an agent for any industrial user within the meaning of 40 CFR Part 63, including but not limited to 40 CFR Part 63.1595.

Pollutants, substances or wastewater prohibited by this section shall not be processed or stored in such a manner that they are likely to be discharged to the POTW unless the user has in place an accidental spill prevention plan (ASPP)/slug control plan. (Ord. 2351, 2018)