§ 10-21. Prohibitions and limitations on waste water discharges.  


Latest version.
  • (a)

    Prohibitions on waste water discharges. No person shall discharge or deposit or cause or allow to be discharged or deposited into the waste water treatment system any waste water which contains the following:

    (1)

    Oils and grease. Waste water from industrial facilities containing floatable fats, wax, grease or oils. Concentration of mineral origin of more than one hundred (100) mg/l whether emulsified or not, or containing substances which may solidify or become viscous at temperatures between thirty-two (32) degrees and one hundred fifty (150) degrees Fahrenheit (zero degrees and sixty-five (65) degrees centigrade) at the point of discharge into the system.

    (2)

    Explosive mixtures. Liquids, solids or gases which by reason of their nature or 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 (2) successive readings on an explosion hazard meter, at the point of discharge into the sewer system, be more than five (5) per cent nor any single reading over ten (10) per cent of the lower explosive limit (L.E.L.) of the meter. Prohibited materials include, but are not limited to, gasoline, kerosene, naphtha, benzene toluene, zylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides and sulfides.

    (3)

    Noxious materials. Noxious or malodorous solids, liquids, or gases, which, either singly or by interaction with other wastes, are capable of creating a public nuisance or hazard to life, or are or may be sufficient to prevent entry into a sewer for its maintenance and repair.

    (4)

    Improperly shredded garbage. Garbage that has not been ground or comminuted to such a degree that all particles will be carried freely in suspension under flow conditions normally prevailing in the public sewers, with no particle greater than one-half inch in any dimension.

    (5)

    Radioactive wastes. Radioactive wastes or isotopes of such half-life or concentration that they do not comply with regulations or orders issued by the appropriate authority having control over their use and which will or may cause damage or hazards to the sewerage facilities or personnel operating the system.

    (6)

    Solid or viscous wastes. Solid or viscous wastes which will or may cause obstruction to the flow in a sewer, or otherwise interfere with the proper operation of the waste water treatment system. Prohibited material include, but are not limited to grease, uncommunited garbage, animal flesh 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, plastic, tar, asphalt residues, residues from refining or processing of fuel or lubricating oil and similar substances.

    (7)

    Excessive discharge rate. Waste waters at a flow rate or containing such concentrations or quantities or pollutants that exceeds for any time period longer than fifteen (15) minutes more than five (5) times the average twenty-four-hour concentration, quantities or flow during normal operation and that would cause a treatment process upset and subsequent loss of treat efficiency.

    (8)

    Toxic substances. Any toxic substances in amounts exceeding standards promulgated by the administrator of the United States Environmental Protection Agency pursuant to Section 307(a) of the Act, and chemical elements or compound, phenols or other taste or odor-producing substances, or any other substances which are not susceptible to treatment or which may interfere with the biological processes or efficiency of the treatment system, or that will pass through the system.

    (9)

    Unpolluted waters. Any unpolluted water including, but not limited to, water from cooling systems or of storm water origin, which will increase the hydraulic load on the treatment system.

    (10)

    Discolored materials. Wastes with objectionable color not removable by the treatment process.

    (11)

    Corrosive wastes. Any waste which will cause corrosion or deterioration of the treatment system. All wastes discharged to the public sewer system must have a pH value in the range of six (6) to nine (9) standard units. Prohibited materials include, but are not limited to, acids, sulfides, concentrated chloride and fluoride compounds and substances which will react with water to form acidic products.

    (b)

    Limitations on waste water discharges. No person shall discharge or convey, or permit or allow to be discharged or conveyed, to a public sewer any waste water containing pollutants of such character or quantity that will:

    (1)

    Not be susceptible to treatment or interfere with the process or efficiency of the treatment system.

    (2)

    Constitute a hazard to human or animal life, or to the stream or watercourse receiving the treatment plant effluent.

    (3)

    Violate pretreatment standards.

    (4)

    Cause the treatment plant to violate its NPDES permit or applicable receiving water standards.

    (5)

    No person shall discharge wastewater containing concentrations of the constituents listed below in excess of the upper limits listed below. If more stringent standards have been promulgated by the state or EPA in applicable categorical pre-treatment standards, they will supersede the following standards.

    (6)

    The following are the maximum concentrate of pollutants allowable in wastewater discharges to the wastewater treatment system. Dilution of any wastewater discharges for the purpose of satisfying these requirements shall be considered a violation of this article:

    Pretreatment Standards (mg/l)

    Pollutant 30 Day Average Daily Maximum
    Arsenic as AS 0.2 0.4
    Aluminum as AL 5.0 10.0
    Cadmium as Cd 0.1 0.2
    Chromium (total) as Cr 2.5 5.0
    Chromium (Hexavalent) 0.1 0.2
    Copper as Cu 2.0 3.0
    Cyanide, total 0.5 1.0
    Iron, total as Fe 10.0 20.0
    Lead total as PB 2.5 5.0
    Manganese, total as Mn 2.0 4.0
    Nickel, total as Ni 0.5 1.0
    Phenols 5.0 10.0
    Organic Phosphorus as P 5.0 10.0
    Inorganic Phosphorus as P 15.0 30.0
    Silver, total 0.25 0.5
    Tin, total 5.0 10.0
    Zinc, total 2.5 5.0
    pH 6.0-11.0 Standard Units
    Temperature Not over 150 (except where higher temperatures are permitted by law)

     

    (c)

    Special agreements. Nothing in this section shall be construed as preventing any special agreement or arrangement between the city and any user of the waste water treatment system whereby waste water of unusual strength or character, including high strength waste water as defined herein, is accepted into the system especially treated subject to any payment or user charges as may be applicable. The agreement with the user may contain provisions for the sampling and monitoring of waste water discharge; reporting requirements and surcharge rates.

    (d)

    Charges and fees. The city may adopt charges and fees which may include:

    (1)

    Fees for reimbursement of costs of setting up and operating the city's pretreatment program.

    (2)

    Fees for monitoring, inspection and surveillance procedures.

    (3)

    Fees for reviewing accidental discharge procedures and construction.

    (4)

    Fees for permit applications.

    (5)

    Fees for filing appeals.

    (6)

    Fees for consistent removal (by the city) of pollutants otherwise subject to Federal Pretreatment Standards;

    (7)

    Other fees as the city may deem necessary to carry out the requirements contained herein.

    These fees relate solely to the matters covered by this article and are separate from all other fees chargeable by the city.

(Ord. No. A-18a, § 2, 3-21-83; Ord. No. A-18c, § 1, 12-15-87; Ord. No. A-67, § 4, 8-15-89)