(A) No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewers;
(1) Any gasoline benzene, naphtha, fuel oil, or other flammable or explosive liquid, solid or gas.
(2) Any waters or wastes containing toxic or poisonous solids, liquids, or gases in sufficient quantity, either singly or by interaction with other wastes, to humans or animals, create a public nuisance, or create any hazard in the receiving waters of the sewage treatment plant, including, but not limited to cyanides in excess of two milligrams per liter as Total Cyanide (CN) in the wastes as discharged to the public sewer.
(3) Any waters or wastes having a pH lower than 6.5, or having any other corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the sewage works.
(4) Solid or viscous substances in quantities or of such size capable of causing obstruction to the flow in sewers, or other interference with the proper operation of the sewage works such as, but not limited to, ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, unground garbage, whole blood, paunch manure, hair and fleshings, entrails and paper dishes, cups, milk containers and the like, either whole or ground by garbage grinders.
(B) No person shall discharge or cause to be discharged the following described substances, materials, waters, or wastes if it appears likely in the opinion of the Superintendent that such wastes can harm either 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. In forming his opinion as to the acceptability of these wastes, the Superintendent will give consideration to such factors as the quantities of subject wastes in relation to flows and velocities in the sewers, materials of construction of the sewers, nature of the sewage treatment process, capacity of the sewage treatment plan, degree of treatability of wastes in the sewage treatment plant, and other pertinent factors. The substances prohibited are:
(1) Any liquid or vapor having a temperature higher than 150°F (65°C).
(2) Any water or waste containing fats, wax, grease, or oils whether emulsified or not, in excess of 100 milligrams per liter or containing substances which may solidify or become viscous at temperatures between 32° and 150°F (0° and 65°C).
(3) Any garbage that has not been properly shredded. The installation and operation of any garbage grinder equipped with a motor of three-fourths horsepower (0.76 hp) metric or greater shall be subject to the review and approval of the Superintendent.
(4) Any waters or wastes containing strong acid iron pickling wastes, or concentrated plating solutions whether neutralized or not.
(5) Any waters or wastes containing iron, chromium, copper, zinc, and similar objectionable or toxic substances; or wastes exerting an excessive chlorine requirement, to such degree that any such material received in the composited sewage at the sewage treatment works exceeds the following respective limits for such materials:
Waste or Chemical | Concentration mg/l |
Boron | 1.0 |
Chromium (Hexavalent) | 5.0 |
Chromium (Trivalent) | 10.0 |
Copper | 3.0 |
Cyanide | 2.0 |
Iron | 15.0 |
Lead | 0.1 |
Nickel | 3.0 |
Oil & Grease, etc. (carbon Tetrachloride extraction) | 100.0 |
Temperature not over 150°F(65°C) | |
Acid iron pickling waste or concentrated | |
Planting waste | 0 |
Free acids and alkalis pH | between 5.5 and 9.5 |
Zinc | 2.0 |
Cadmium | 2.0 |
Chlorine Demand | 30.0 |
Phenols | 0.5 |
(6) Any waters or wastes containing phenols or other taste- or odor-producing substances, in such concentrations exceeding limits which may be established by the Superintendent as necessary, after treatment of the composited sewage, to meet the requirements of the state, federal, or other public agencies of jurisdiction for such discharge to the receiving waters.
(7) Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the Superintendent in compliance with applicable state or federal regulations.
(8) Any waters or wastes having a pH in excess of 9.5.
(9) Materials which exert or cause:
(a) Unusual concentrations of inertly suspended solids (such as, but not limited to, Fullers earth, lime slurries, and lime residues) or of dissolved solids (such as, but not limited to, sodium chloride and sodium sulfate.)
(b) Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions).
(c) Unusual BOD, chemical oxygen demand, or chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works.
(d) Unusual volume of flow or concentration of wastes constituting "slugs" as defined herein.
(10) Waters or wastes containing substances which are not amenable, to treatment or reduction by the sewage treatment processes employed, or are amenable to treatment only to such degree that the sewage treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.
(Ord. 113, passed 7-23-75) Penalty, see § 51.999