A. Storm And Unpolluted Waters Not Allowed: No person shall discharge or cause to be discharged any storm water, surface water, ground water, roof runoff, subsurface drainage, uncontaminated cooling water, or unpolluted industrial process waters to any sanitary sewer.
B. Discharge Of Storm And Unpolluted Waters: Storm water and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as storm sewers, or combined sewers, or to a natural outlet approved by the City Manager. Industrial cooling water or unpolluted process waters may be discharged, on approval of the City Manager, to a storm sewer, combined sewer, or natural outlet.
C. Prohibited Waste:
1. 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 otherwise endanger life, limb, public property, or constitute a nuisance. In forming his opinion as to the acceptability of these waters, 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 plant, degree of treatability of wastes in the sewage treatment plant, and other pertinent factors. The substances prohibited are:
a. Any gasoline, benzene, naphtha, fuel oil, or other flammable or explosive liquid, solid, or gas.
b. 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 receiving waters of the sewage plant, including but not limited to cyanides in excess of five one-hundredths (0.05) mg/l as CN in the wastes as discharged to the public sewer.
c. Any waters or wastes having a pH lower than five and five- tenths (5.5) or having any other corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the sewage works.
d. 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, woods, unground garbage, whole blood, paunch manure, hair and fleshings, entrails and paper dishes, cups, milk containers, etc., either whole or ground by garbage grinders.
e. Any liquid or vapor having a temperature higher than one hundred fifty degrees Fahrenheit (150°F) (65°C).
f. Any water or waste containing fats, wax, grease, or oils, whether emulsified or not, in excess of seventy five (75) mg/l or containing substances which may solidify or become viscous at temperatures between thirty two degrees Fahrenheit and one hundred fifty degrees Fahrenheit (32°F and 150°F) (0°C and 65°C).
Fats, oil and grease, etc., can be analytically separated into polar and nonpolar components. Those materials of a mineral or petroleum origin (nonpolar components) in excess of seventy five (75) mg/l shall not be allowed. Those materials of an animal and vegetable origin (polar components) may be allowed in the sewerage system, if they do not in the opinion of the Superintendent hinder or harm the operation of the treatment plant, sewers, equipment, or have an adverse affect on the receiving stream. Any concentration of polar components above one hundred (100) mg/l shall be billed as described in Section 7-2-7 of this Chapter, "Wastewater Service Charges".
g. Any garbage that has not been properly shredded. The installation and operation of any garbage grinder equipped with a motor of three-fourths (3/4) horsepower and seventy six one-hundredths (0.76) horsepower metric or greater shall be subject to the review and approval of the City Manager.
h. Any waters or wastes containing strong acid iron pickling wastes, or concentrated plating solutions whether neutralized or not.
i. The maximum acceptable concentration of certain substances in the waste discharged to the City sewers shall be as follows:
Waste Or Chemical
|
Concentration (mg/l)
|
Waste Or Chemical
|
Concentration (mg/l)
|
Arsenic (total) | 0.25 |
Barium (total) | 2.0 |
Boron | 1.0 |
Cadmium (total) | 0.15 |
Chromium (total hexavalent) | 0.3 |
Chromium (total trivalent) | 1.0 |
Copper (total) | 1.0 |
Fluoride (total) | 2.5 |
Iron (total) | 2.0 |
Iron (dissolved) | 0.5 |
Lead (total) | 0.1 |
Manganese (total) | 1.0 |
Mercury (total) | 0.0005 |
Nickel (total) | 1.0 |
Selenium (total) | 1.0 |
Silver | 0.1 |
Zinc (total) | 1.0 |
Any other wastes or substances not enumerated above being similar objectionable or toxic substances or wastes exerting an excessive chlorine requirement of such degree that any such material received in the composite sewage of the sewage treatment works exceeding the requirements of the State, Federal or other public agencies or jurisdiction for such discharge to the receiving waters.
The City may also, upon notice to any person, require the lowering of any chemical contents of any substances discharged into the City sewer which injures the treatment process of the City.
j. The maximum acceptable concentrate of phenols in waste discharged to the City sewer shall be three-tenths (0.3) mg/l.
k. Any radioactive wastes or isotopes of such half life or concentration as may exceed limits established by the City Manager in compliance with applicable State or Federal regulations.
l. Any waters or wastes having a pH in excess of nine and five-tenths (9.5).
m. Materials which exert or cause:
(1) Unusual concentrations of inert suspended solids (such as, but not limited to, fuller's earth, lime slurries, and lime residues) or of dissolved solids (such as, but not limited to, sodium chloride and sodium sulfate).
(2) Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions).
(3) Unusual BOD, chemical oxygen demand, or chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works.
(4) Unusual volume of flow or concentration of wastes constituting "slugs" as defined herein.
n. Waters or wastes containing substances which are not amenable to treatment or reduction by the sewage treatment processes employed, or 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.
o. All exhaust from steam engines and all blow offs from steam boilers shall be first connected with a proper catch basin, and shall not be allowed to connect directly with the public sewers without special permission from the approving authority.
p. Any waters or wastes having:
(1) A five (5) day BOD greater than three hundred (300) parts per million by weight, or
(2) Containing more than three hundred fifty (350) parts per million by weight of suspended solids, or
(3) Having an average daily flow greater than two percent (2%) of the average sewage flow of the City, shall be subject to the review of the City.
2. Where necessary in the opinion of the City, the owner shall provide, at his expense, such preliminary treatment as may be necessary to:
a. Reduce the biochemical oxygen demand to three hundred (300) parts per million by weight, or
b. Reduce the suspended solids to three hundred fifty (350) parts per million by weight, or
c. Control the quantities and rates of discharge of such waters or wastes. Plans, specifications, and any other pertinent information relating to proposed preliminary treatment facilities shall be submitted for the review of the City and no construction of such facilities shall be commenced until said review is obtained in writing. (Ord. 12-80, 12-16-1980)
D. Illicit Discharge:
1. Source Of Sewage To Be Treated: Any raw influent that originates outside of Wapsinonoc Township located in Muscatine County, Iowa is prohibited without the express written consent of the West Liberty City Council.
2. Trucking And Hauling: The trucking and hauling of raw influent for the purpose of adding waste into the West Liberty sanitary sewer system from an industrial source is also prohibited without the express written consent of the West Liberty City Council.
3. Fines: Violation of this subsection D will be subject to fines that are specified in section 7-2-17, "Penalties", of this chapter. (Ord. 2008-04, 8-19-2008)