15.10.025 Use of Public Sewers.
A. No person shall discharge, or cause to be discharged, any stormwater, surface water, groundwater, roof runoff, subsurface drainage, unreasonably large amounts of uncontaminated cooling water or unpolluted process waters to any sanitary sewer.
B. Stormwater and all other unpolluted drainage shall be discharged to storm sewers, or to a natural outlet approved by the City. Industrial cooling water or unpolluted process waters may be discharged to a storm sewer or natural outlet if the discharge is approved in writing by the City and Oregon DEQ.
C. 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 injure or interfere with any sewage treatment process, constitute a hazard to humans or animals, create a public nuisance, or create any hazard in the effluent disposal system of the sewage treatment plant, including but not limited to cyanides in excess of 0.5 mg/l as CN in the wastes as discharged to the public sewer.
3. Any water or wastes having a pH lower than 5.0, 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 of the flow in sewers, or other interference with the proper operation of the sewage works including, 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, etc., either whole or ground by garbage grinders.
D. 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 City that such wastes can harm either the sewers, sewage treatment process or equipment, have an adverse effect on the effluent disposal system, or can otherwise endanger life, limb, public property or constitute a nuisance. In review of the acceptability of these wastes, the City 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 plant, 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 149 degrees Fahrenheit (65 degrees Celsius).
2. Solid or viscous substances which may cause obstruction to the flow in a sewer or other interference with the operation of the wastewater treatment facilities such as, but not limited to: grease, garbage with particles greater than one-half inch in any dimension, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble, dust, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, waste paper, wood, plastics, gas tar, asphalt residues, residues from refining or processing of fuel or lubricating oil, mud or glass grinding, or polishing wastes.
3. Any waters or wastes containing iron, chromium, copper, zinc, lead and similar objectionable or toxic substances; or wastes exerting an excessive chlorine requirement, to such degree that any such material received in the composite sewage at the sewage treatment works exceeds established City limits.
4. Any waters or wastes containing phenols or other taste or odor producing substances, in such concentrations exceeding limits which may be established by the City as necessary, after treatment of the composite sewage, to meet the requirements of the State or Federal Government.
5. Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the State or Federal regulations.
6. Any waters or wastes having a pH in excess of 11.0.
7. Materials which exert or cause:
a. Unusual concentrations of inert suspended solids, (including but not limited to: fuller’s earth, lime slurries, and lime residues) or of dissolved solids (including, but not limited to, sodium chloride and sodium sulfate).
b. Excessive discoloration (including, 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.
8. 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 the State and Federal agencies having jurisdiction over discharge to the receiving water. [Ord. NS-2182, 2012]