(A) General prohibitions. No user shall contribute, or cause to be contributed, into the POTW, directly or indirectly, any pollutant or wastewater which causes interference or pass through. These general prohibitions apply to all users of a POTW, whether or not the user is a significant industrial user, or subject to any national, state, or local pretreatment standards or requirements.
(B) Specific prohibitions. No user shall contribute, or cause to be contributed, 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 140°F (60°C) using the test methods specified in 40 C.F.R. § 261.21;
(2) 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-half inch in any dimension;
(3) Petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass through;
(4) Any wastewater having a pH less than 5.0 or more than 10.0, or wastewater having any other corrosive property capable of causing damage to the POTW or equipment;
(5) Any wastewater containing pollutants, including oxygen-demanding pollutants, (BOD, and the like) in sufficient quantity (flow or concentration), either singly or by interaction with other pollutants, to cause interference with the POTW;
(6) Any wastewater having a temperature greater than 150°F (66°C), or which will inhibit biological activity in the POTW treatment plant resulting in interference, but in no case wastewater which causes the temperature, at the introduction into the treatment plant, to exceed 104°F (40°C);
(7) Any 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) Any trucked or hauled pollutants, except at discharge points designated by the POTW Director in accordance with § 21-314;
(9) Any noxious or malodorous liquids, gases, or solids, or other wastewater which, either singly or by interaction with other wastes, are sufficient to create a public nuisance or hazard to life, or are sufficient to prevent entry into the sewers for maintenance and repair;
(10) Any substance which may cause the POTWs 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 the POTW to be in non-compliance with sludge use or disposal regulations, or permits issued under § 405 of the Act, the Solid Waste Disposal Act (15 U.S.C. §§ 6901 et seq.), the Clean Air Act, the Toxic Substances Control Act (15 U.S.C. §§ 2601 et seq.), or state criteria applicable to the sludge management method being used;
(11) Any wastewater which imparts color which cannot be removed by the treatment process, including, but not limited to, dye wastes and vegetable tanning solutions, which consequently impacts sufficient color to the treatment plant’s effluent to render the waters injurious to public health or secondary recreation, or to aquatic life and wildlife, or to adversely affect the palatibility of fish or aesthetic quality, or impair the receiving waters for any designated uses;
(12) Any wastewater containing any radioactive wastes, or isotopes of such half-life or concentration, as may exceed limits established by the Superintendent in compliance with applicable state, and federal, regulations;
(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) Fats, oils, or greases of animal or vegetable origin in concentrations greater than 100 mg/l;
(15) Any sludges, screenings, or other residues from the pretreatment of industrial wastes;
(16) Any medical wastes, except as specifically authorized by the POTW Director in a wastewater discharge permit;
(17) Wastewater causing, alone or in conjunction with other sources, the treatment plant’s effluent to fail a toxicity test;
(18) Any wastes containing detergents, surface active agents, or other substances which may cause excessive foaming in the municipal wastewater system;
(19) At no time shall two successive readings on an explosion hazard meter, at the point of discharge into the system (or at any point in the system), be more than 5%, nor any single reading over 10% of the lower explosive limit (LEL) of the meter;
(20) Stormwater, surface water, ground water, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, non-contact cooling water, and unpolluted industrial wastewater, unless specifically authorized by the POTW Director;
(21) Any material containing ammonia, ammonia salts, or other chelating agents which will produce metallic complexes that interfere with the municipal wastewater system;
(22) Recognizable portions of the human or animal anatomy; and
(23) Any wastewater causing the treatment plant effluent to violate State Water Quality Standards for toxic substances, as described in 15 N.C.A.C. 2B.0200.
(C) Prohibited wastes. Pollutants, substances, wastewater, or other wastes prohibited by this section shall not be processed, or stored, in such a manner that they could be discharged to the municipal wastewater system. All floor drains located in process, or materials storage, areas must discharge to the industrial user’s pretreatment facility before connecting with the system.
(D) Contributions by users. When the POTW Director determines that a user(s) is contributing to the POTW any of the above enumerated substances in such amounts which may cause, or contribute to, interference of POTW operation or pass through, the POTW Director shall:
(1) Advise the user(s) of the potential impact of the contribution on the POTW in accordance with § 21-372; and
(2) Take appropriate actions in accordance with division 4 for such user to protect the POTW from interference or pass through.
(Ord. 33-2002, passed 10-21-2002; Ord. 29-2008, passed 10- -2008)