§ 50.056  PROHIBITED WASTES AND LIMITATIONS.
   No person shall discharge or cause to be discharged from any point any of the following described wastewaters to any public sanitary sewers:
   (A)   Any liquid or vapor having a discharge temperature higher than 120°F., nor any liquid or vapor having heat in such quantities that the temperature at the treatment plant influent exceeds 104°F.
   (B)   Any wastewater which contains more than 200 mg/l by weight of fat soluble oil or grease, or containing any substance that will solidify or become viscous at temperatures between 32°F. and 150°F. at the point of discharge into the system. All petroleum based oil and/or grease discharges are prohibited.
   (C)   Liquids, solids, or gases which by reason of their nature of 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 sewerage facilities or to the operation of the system.  At no time shall two successive readings on an explosion hazard meter, at the point of discharge into the sewer system, be more than 5% nor any single reading over 10% of the lower explosive limit (LEL) of the meter. Such potentially explosive materials include, but are not limited to gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides, and methane.
   (D)   Any wastewater that contains more than two mg/l by weight, of hydrochloric acid, hydrogen sulfide, sulfur dioxide, or nitrous oxide.
   (E)   Any ashes, cinders, sand, mud, straw, shavings, metal, glass, tars, plastics, wood, rags, and other fibrous solids, feathers, offal, whole blood, paunch contents, manure, hair and fleshings, entrails, lime slurry and lime residues, beer or distillery slops, chemical residues, fiberglass, paint, paint thinners, latex, lacquers, or ink residues, cannery waste, ground paper products, unshredded bulk solids with particles greater than l/2-inch in any dimension, discharges from photographic laboratories, or any other solid or viscous substance capable of causing obstruction to the flow in sewers, or other interference (as defined in § 50.001) with the proper operation of the wastewater collection system and the wastewater treatment facilities.
   (F)   Any wastewater having a stabilized pH lower than six or higher than ten standard units (SU), or having any wastewater that would cause the wastewater treatment facilities' influent to exceed a minimum of six or a maximum of eight standard units (SU), or having any other corrosive property capable of causing damage or hazard to sewers which are constructed of vitrified clay, cast iron, ductile iron, ABS plastic, PVC plastic, or concrete; associated or connected structures; equipment; or personnel of the wastewater collection system, the wastewater treatment facilities, or the treatment process.
   (G)   Any wastewater containing toxic or poisonous substances in such concentrations as to constitute a hazard to humans, animals, fish, or birds; interfere with any wastewater treatment process; or create any hazard in the receiving waters of the wastewater treatment plant.
   (H)   In no event shall any person exceed the following limits on toxic or poisonous substances:
 
Fixed Upper Limits for Constituents
Substance
Weight (mg/l)
Ammonia
100.00
Arsenic
1.00
Beryllium
0.20
Boron
1.00
Cadmium
0.01
Chromium
2.00
Copper
1.00
Cyanide
0.10
Iron
50.00
Lead
3.00
Manganese
60.00
Mercury
0.20
Methylene chloride
0.10
Nickel
3.00
Organic nitrogen
30.00
Selenium
0.20
Silver
0.30
Sulfates
350.00
Sulfides
8.00
Tetrachloroethylene
0.50
Trichloroethylene
0.50
Zinc
0.50
 
   (I)   The limits fixed in division (H) above shall be minimum requirements of all industrial users but do not relieve the user from limiting concentrations of these or other elements or chemical substances which may constitute a public health or safety hazard, or interference with the public wastewater treatment process, as provided for in this section.
   (J)   Any noxious or malodorous gas or substance, singly or by interaction with other wastes, being capable of creating a public health or safety nuisance, hazard to life, or preventing entry into public sanitary sewers for their maintenance, inspection, and repair.
   (K)   Any wastes which are of unusual volume, concentration of solids, or composition that may create obstruction to the flow in sewers or other interference with the proper operation of the wastewater works and the proper treatment of the influent.
   (L)   Wastewater containing substances which are not responsive to treatment by the wastewater treatment processes employed, or are responsive to treatment only to such a degree that the wastewater treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.
   (M)   Any wastewater containing more than 4,000 mg/l total solids by weight.
   (N)   Wastewaters at a flow rate of containing such concentrations or quantities of pollutants, that:
      (1)  Exceed for any time period longer than 15 minutes more than five times the average 24-hour concentration as defined during normal operation.
      (2)  Would cause a treatment process upset and subsequent loss of treatment efficiency.
   (O)   Any wastewater containing phenols or other taste-producing substances in such concentrations as to produce odor or taste in the effluent so as to effect the taste or odor of the receiving water.
   (P)   Any wastewater containing barium, chlorides, fluorides, phospherous, or surfactants in such concentrations as to interfere with any operation of the town's wastewater treatment facility, or to cause the wastewater treatment plant effluent to fail to meet requirements of other agencies having jurisdiction over discharge to the receiving waters.
   (Q)   Radioactive wastes or isotopes of such half-life or concentration that they do not comply with regulations or orders issued by the appropriate state or federal agency having control over their use, and which will or may cause damage or hazards to the sewerage facilities or personnel operating the system.
   (R)   Any concentrated dye wastes, spent tanning solutions, or other wastes with objectionable color, not removable by the treatment process.
   (S)   Any wastewater containing polychlorinated biphenyls (PCB's).
   (T)   Any wastewater containing any measurable traces of pesticides, herbicides, or biocides.
(Ord., passed 7-28-83; Am. Ord. 1072, passed 4-14-88)  Penalty, see § 50.999
Statutory reference:
   Emission of pollutants, see G.S. § 160A-185