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 one hundred forty degrees Fahrenheit (140°F) (60°C) using the test methods specified in 40 CFR section 261.21; (Ord. 2078, 6-3-2008, eff. 6-3-2008)
2. Wastewater having a pH less than 5.0 or more than 12.0, or otherwise causing corrosive structural damage to the POTW or equipment; (Ord. 2148, 9-6-2016)
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 two inches (2") in dimension;
4. Pollutants, including oxygen demanding pollutants (BOD, 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 one hundred four degrees Fahrenheit (104°F) (40°C), 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, except at discharge points designated by the city;
9. Noxious or malodorous liquids, gases, solids or other wastewater which, either singly or by interaction with other wastes, are sufficient to create a public nuisance or a hazard to life or health, 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 imparts color to the treatment plant's effluent, thereby violating the city NPDES permit. Color (in combination with turbidity) shall not cause the treatment plant effluent to reduce the depth of the compensation point for photosynthetic activity by more than ten percent (10%) from the seasonably established norm for aquatic life;
11. Wastewater containing any radioactive wastes or isotopes except as specifically approved by the superintendent in compliance with applicable state or federal regulations;
12. Stormwater, surface water, groundwater, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, noncontact cooling water, and unpolluted wastewater, unless specifically authorized by the superintendent;
13. Any sludge, screenings or other residue from the pretreatment of industrial wastes or from industrial processes;
14. Medical wastes, except as specifically authorized by the city;
15. Wastewater causing, alone or in conjunction with other sources, the treatment plant's effluent to fail a toxicity test;
16. Detergents, surface active agents or other substances which may cause excessive foaming in the POTW;
17. Any liquid, 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 percent (5%) nor any single reading over ten percent (10%) of the lower explosive limit (LEL) of the meter;
18. Grease, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble dusts, 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;
19. Any substance which will cause the POTW to violate its NPDES and/or other disposal system permits;
20. Any wastewater, which in the opinion of the superintendent 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);
21. The contents of any tank or other vessel owned or used by any person in the business of collecting or pumping sewage, effluent, septic tank waste or other wastewater, unless said person has first obtained testing and approval as may be generally required by the city and paid all fees assessed for the privilege of said discharge;
22. Any hazardous wastes, as defined in rules published by the state or in federal regulations 40 CFR part 261;
23. Persistent pesticides and/or pesticides regulated by the federal insecticide fungicide rodenticide act (FIFRA);
24. Sewage sludge, except in accordance with the city NPDES permit; providing, that it specifically allows the discharge to surface waters of sewage sludge pollutants;
25. Any garbage that has not been properly ground.
C. Discharge Prohibited: Pollutants, substances or wastewater prohibited by this section shall not be processed or stored in such a manner that they could be discharged to the POTW. (Ord. 2078, 6-3-2008, eff. 6-3-2008)