(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, by their nature of quantity, are or may be sufficient, either alone or by interaction with other substances, able to 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. Prohibited materials include, but are not limited to: gasoline, kerosene, naphtha, benzene, toluene, zylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides, and sulfides;
(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. Prohibited materials include, but are not limited to: grease, uncomminuted garbage, animal guts or tissues, paunch manure, bones, hair, hides or fleshing, 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, plastic, tar, asphalt residues, residues from the refining or processing of fuel or lubricating oil, and similar substances;
(3) Total fat, fats, oils, wax, or greases of animal or vegetable origin in concentrations greater than 100 mg/l, whether emulsified or not, or containing substances which may solidify or become viscous at temperatures between 32°F and 150°F (0°C and 65°C) at the point of discharge into the system. Petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin in amounts that will cause interference or pass-through;
(4) Any wastewater which will cause deterioration or corrosion of the wastewater treatment system. All wastewater discharged to the wastewater treatment system must have a pH between 6.0 and 9.0. Prohibited materials include, but are not limited to, acids, sulfides, concentrated chloride and fluoride compounds, and substances which will react with water to form acidic products;
(5) Any wastewater-containing pollutants, including oxygen-demanding pollutants (such as BOD), 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 § 52.011;
(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 POTW’s effluent or any other product of the POTW (such as residues, sludge, 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 noncompliance with sludge use or disposal regulations or permits issued under § 405 of the Act, being 33 U.S.C. § 1345, the Solid Waste Disposal Act, being 33 U.S.C. § 1345, the Clean Air Act, being 42 U.S.C. §§ 7401 et seq., the Toxic Substances Control Act, being 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 imparts 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 palatability of fish or aesthetic quality or impair the receiving waters for any designated uses;
(12) Any wastewater containing any radioactive wastes or isotopes except as specifically approved by the POTW Director in compliance with applicable state or federal regulations;
(13) Stormwater, surface water, groundwater, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, de-ionized water, non-contact cooling water, and unpolluted industrial wastewater unless specifically authorized by the POTW Director;
(14) Any wastewater that constitutes a slug load;
(15) Any sludge, 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) Any material containing ammonia, ammonia salts, or other chelating agents which will produce metallic complexes that interfere with the municipal wastewater system;
(18) Any material that would be identified as hazardous waste according to 40 C.F.R. part 261 if not disposed of in a sewer except as may be specifically authorized by the POTW Director;
(19) Any wastewater causing the treatment plant effluent to violate state water quality standards for toxic substances, as described in 15A NCAC 2B.0200;
(20) Wastewater causing, alone or in conjunction with other sources, the treatment plant’s effluent to fail a toxicity test;
(21) Recognizable portions of the human or animal anatomy;
(22) Any wastes containing detergents, surface active agents, or other substances which may cause excessive foaming in the municipal wastewater system;
(23) Any toxic substances in amounts exceeding standards promulgated by the administrator of the United States Environmental Protection Agency pursuant to § 307(a) of the Federal Water Pollution Control Act Amendments of 1972, Pub. Law No. 92-500, and chemical elements or compounds, phenols or other taste or producing substances, or any other substances which are not susceptible to treatment which may interfere with the biological processes or efficiency of the wastewater treatment system or that will pass through the system.
(24) Any clothing, rags, textile remnants or waste, or cloth scraps except fibers of scrap that will pass through a one-fourth-inch mesh screen or its equivalent in screening ability;
(25) Any waters or wastes in which the total fixed solids exceed 1,500 ppm by weight; and
(26) 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.
(C) Manner of storage or discharge. 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) POTW contribution or interference; determination. When the POTW Director determines that a user is contributing to the POTW any of the substances enumerated in division (B) above in such amounts which may cause or contribute to interference of POTW operation or pass-through, the POTW Director shall:
(1) Advise the user of the potential impact of the contribution on the POTW in accordance with § 52.045; and
(Prior Code, § 28-164) (Ord. 11-00, passed 9-7-2000)