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The following abbreviations, when used in this article, shall have the designated meanings:
BOD
5
| Biochemical oxygen demand |
CFR | Code of Federal Regulations |
COD | Chemical oxygen demand |
EPA | Environmental Protection Agency |
gpd | Gallons per day |
l | Liter |
mg | Milligrams |
mg/l | Milligrams per liter |
N.C.G.S. | North Carolina General Statutes |
NPDES | National Pollution Discharge Elimination System |
O&M | Operation and maintenance |
POTW | Publicly-owned treatment works |
RCRA | Resource Conservation and Recovery Act |
SIC | Standard Industrial Classification |
SWDA | Solid Waste Disposal Act |
TSS | Total suspended solids |
TKN | Total Kjeldahl nitrogen |
USC | United States Code |
(Ord. of 10-1-1996, § 1.2(e) ; Amend. of 3-3-2008(3); Ord. of 3-4-2013)
Secs. 24-104—24-120. - Reserved.
DIVISION 2. - USE REQUIREMENTS
Sec. 24-121. - Prohibited discharge standards.
Sec. 24-122. - National Categorical Pretreatment Standards.
Sec. 24-123. - Local limits.
Sec. 24-124. - State requirements.
Sec. 24-125. - Right of revision.
Sec. 24-126. - Dilution.
Sec. 24-127. - Pretreatment of wastewater.
Sec. 24-128. - Grease trap and interceptor installation, maintenance, recordkeeping and removal.
Sec. 24-129. - Accidental discharge/slug control plans.
Sec. 24-130. - Hauled wastewater.
Secs. 24-131—24-150. - Reserved.
(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, wastestreams with a closed cup flashpoint of less than 140 degrees Fahrenheit (60 degrees Celsius) using the test methods specified in 40 CFR 261.21.
(2) Ashes, cinders, sand, mud, straw, shaving, metal, glass, septic tank sludge, hair, bones, feathers, tar, plastics, resins, paint, wood, paunch manure, butcher's offal, dead animals, recognizable portions of the human or animal anatomy or any other solids or viscous substances capable of causing obstructions to the flow in wastewater lines, or other interference with the proper operation of the wastewater collection system, pumping facilities, or the wastewater treatment plant.
(3) Petroleum oil, nonbiodegradable 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 6.0 or more than 9.0 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, etc.) 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 degrees Fahrenheit (66 degrees Celsius), 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 degrees Fahrenheit (40 degrees Celsius).
(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 director in accordance with section 24-129.
(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, 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 noncompliance with sludge use or disposal regulations or permits issued under section 405 of the act; the Solid Waste Disposal Act, the Clean Air Act, the Toxic Substances Control Act, 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 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, deionized water, noncontact cooling water and unpolluted industrial wastewater, unless specifically authorized by the director.
(14) Fats, oils, or greases of animal or vegetable origin in concentrations greater than 50 mg/l, unless specifically authorized by the director.
(15) Any sludges, screenings or other residues from the pretreatment of any wastes, including industrial wastes.
(16) Any medical wastes, except as specifically authorized by the 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 CFR 261 if not disposed of in a sewer except as may be specifically authorized by the 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.
(c) Explosion hazard meter readings. 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 five percent nor any single reading over ten percent of the lower explosive limit (LEL) of the meter.
(d) Discharges into user's pretreatment facility. 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.
(e) Action by director. When the director determines that a user is contributing to the POTW, any of the substances listed in subsection (b) of this section in such amounts which may cause or contribute to interference of POTW operation or pass through, the director shall:
(1) Advise the user of the potential impact of the contribution on the POTW in accordance with section 24-241; and
(2) Take appropriate actions in accordance with division 4 of this article for such user to protect the POTW from interference or pass through.
(f) Nonindustrial users. For nonindustrial users, the director may delegate the responsibility of enforcement of these prohibitions to the local municipality to which the user is connected.
(Ord. of 10-1-1996, § 2.1; Ord. of 3-4-2013)
(a) Users subject to categorical pretreatment standards are required to comply with applicable standards as set out in 40 CFR chapter 1, subchapter N, parts 405—471 and incorporated in this section.
(b) Where a categorical pretreatment standard is expressed only in terms of either the mass or the concentration of a pollutant in wastewater, the director may impose equivalent concentration or mass limits in accordance with 40 CFR 403.6(c).
(c) When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the director shall impose an alternate limit using the combined wastestream formula in 40 CFR 403.6(e).
(d) A user may obtain a variance from a categorical pretreatment standard if the user can prove, pursuant to the procedural and substantive provisions in 40 CFR 403.13, that factors relating to its discharge are fundamentally different from the factors considered by EPA when developing the categorical pretreatment standard.
(e) A user may obtain a net gross adjustment to a categorical standard in accordance with 40 CFR 403.15.
(f) A user may request a removal credit adjustment to a categorical standard in accordance with 40 CFR 403.7.
(Ord. of 10-1-1996, § 2.2; Ord. of 3-4-2013)
(a) An industrial waste survey is required prior to a user discharging wastewater containing in excess of the following average discharge limits.
BOD
5
| 250 mg/l |
COD | 500 mg/l |
TSS | 250 mg/l |
Fats, Oils, and Grease | 100 mg/l |
T.D.S. | 1,000 mg/l |
Total Nitrogen | 40 mg/l |
Total Phosphorus | 8 mg/l |
Arsenic | 0.003 mg/l |
Cadmium | 0.003 mg/l |
Copper | 0.061 mg/l |
Cyanide | 0.015mg/l |
Lead | 0.049 mg/l |
Mercury | 0.0003 mg/l |
Nickel | 0.021 mg/l |
Silver | 0.005 mg/l |
Chromium(total) | 0.05 mg/l |
Zinc | 0.175 mg/l |
Ammonia | 25 mg/l |
(b) Industrial waste survey information will be used to develop user-specific local limits when necessary to ensure that the POTW's maximum allowable headworks loading is not exceeded for particular pollutants of concern. User-specific local limits for appropriate pollutants of concern shall be included in wastewater permits. The director may impose mass based limits in addition to or in place of concentration based limits.
(Ord. of 10-1-1996, § 2.3; Amend. of 3-3-2008(3); Ord. of 3-4-2013)
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