§ 98-320. Specific pollutant limitations.

(a)

Maximum concentrations of heavy metals . Under this article, the maximum allowable concentrations of heavy metals stated in terms of milligrams per liter (mg/l), determined on the basis of individual sampling in accordance with 40 CFR Part 136 are as follows:

(1)

Arsenic, 1.39 mg/l;

(2)

Barium, 56.80 mg/l;

(3)

Cadmium, 3.34 mg/l;

(4)

Chromium, 15.41 mg/l;

(5)

Copper, 2.49 mg/l

(6)

Cyanide, 0.11 mg/l;

(7)

Lead, 6.39 mg/l;

(8)

Mercury, 0.03 mg/l;

(9)

Nickel, 3.79 mg/l;

(10)

Silver, 0.48 mg/l; and

(11)

Zinc, 3.50 mg/l.

(b)

Permit for other heavy metals or toxic pollutants. No other heavy metals or toxic pollutants may be discharged into public sewers without a permit from the city specifying conditions of pretreatment, concentrations, volumes and other applicable provisions.

(c)

Prohibited heavy metals and toxic materials. Prohibited heavy metals and toxic materials include, but are not limited to, the following:

(1)

Antimony;

(2)

Beryllium;

(3)

Bismuth;

(4)

Cobalt;

(5)

Molybdenum;

(6)

Tin;

(7)

Uranyl ion;

(8)

Rhenium;

(9)

Strontium;

(10)

Tellurium;

(11)

Herbicides;

(12)

Fungicides; and

(13)

Pesticides.

(d)

Prohibited discharges. No person may discharge to public sewers any waste which by itself or by interaction with other wastes may:

(1)

Injure or interfere with wastewater treatment processes or facilities;

(2)

Constitute a hazard to humans or animals; or

(3)

Create a hazard in receiving waters of the POTW effluent.

(e)

Chemical discharges.

(1)

No discharge to public sewers may contain:

a.

Chlorides in concentrations of such an amount as to cause pass through or interference with the sanitary sewer system;

b.

Gasoline, benzene, naphtha, fuel oil or other flammable or explosive liquid, solid or gas;

c.

Substances causing an excessive chemical oxygen demand; or

d.

Fluoride other than that contained in the public water supply.

(2)

No waste or wastewater discharged to public waters may contain:

a.

Strong acid, iron pickling wastes or concentrated plating solutions, whether neutralized or not;

b.

Fats, wax, grease or oils, whether emulsified or not, in excess of 100 mg/l or containing substances which may solidify or become viscous at temperatures between 32 and 150 degrees Fahrenheit (0 and 65 degrees Celsius);

c.

No waste, wastewater or other substance may be discharged into public sewers which has a pH lower than 5.0 or higher than 9.0 or any other corrosive property capable of causing damage or hazard to structures, equipment and personnel at the wastewater facilities. The limits set forth in this subsection may be altered in a permit properly issued pursuant to this article;

d.

All waste, wastewater or other substance containing phenols, hydrogen sulfide or other taste- and odor-producing substances shall conform to concentration limits established by the city. After treatment of the composite wastewater, concentration limits may not exceed the requirements established by state, federal or other agencies with jurisdiction over discharges to receiving waters.

(f)

Garbage.

(1)

No person may discharge garbage into public sewers unless it is shredded to a degree that all particles can be carried freely under the flow conditions normally prevailing in public sewers. Particles greater than one-half inch in any dimension are prohibited.

(2)

The city is entitled to review and approve the installation and operation of any garbage grinder equipped with a motor of three-fourths horsepower (0.76 hp metric) or greater.

(g)

Stormwater and other unpolluted drainage. No person shall discharge, or cause to be discharged, any stormwater, groundwater, roof runoff, subsurface drainage, downspouts, yard drains, yard fountains and ponds or lawn sprays into any sanitary sewer. Water from swimming pools, unpolluted industrial water, such as boiler drains, blowoff pipes or cooling water from various equipment, shall not be discharged into sanitary sewers without a permit issued through this article by the city. With a permit, it may be discharged into the sanitary sewer by an indirect connection whereby such discharge is cooled, if required, and flows into the sanitary sewer at a rate not in excess of three gallons per minute; provided, that the waste does not contain materials or substances in suspension or solution in violation of the limits prescribed by this article.

(h)

Temperature. No person may discharge liquid or vapor having a temperature higher than 150 degrees Fahrenheit (65 degrees Celsius), or any substance that causes the temperature of the total wastewater treatment plant influent to increase at a rate of ten degrees Fahrenheit or more per hour, or a combined total increase of plant influent temperature to 110 degrees Fahrenheit.

(i)

Radioactive wastes.

(1)

No person may discharge radioactive wastes or isotopes into public sewers without the permission of the city.

(2)

The city may establish, in compliance with applicable state and federal regulations, regulations for discharge of radioactive wastes into public sewers.

(j)

Concentrations of dissolved solids. Materials that exert or cause concentrations of dissolved solids to be discharged in such concentrations as to cause pass through or interference with the sanitary sewer system.

(k)

Discoloration. A prohibited discharge includes materials with excessive discoloration, including, but not limited to, the following:

(1)

Dye wastes; and

(2)

Vegetable tanning solutions.

(l)

Excessive BOD, COD or chlorine. No person shall discharge BOD, COD or chlorine demand in excess of normal plant capacity.

(m)

Other prohibitions. No person may discharge into public sewers any substance that may:

(1)

Deposit grease or oil in the sewer lines in such a manner as to clog the sewers;

(2)

Overload skimming and grease handling equipment;

(3)

Pass to the receiving waters without being effectively treated by normal wastewater treatment processes due to the nonamenability of the substance to bacterial action; or

(4)

Deleteriously affect the treatment process due to excessive quantities.

(n)

Treatment amenability. No person may discharge any substance into public sewers that:

(1)

Is not amenable to treatment or reduction by the processes and facilities employed; or

(2)

Is amenable to treatment only to such a degree that the treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.

(o)

Solid or viscous substances. No person may discharge into public sewers solid or viscous substances which may violate section 98-316 if present in sufficient quantity or size, including, but not limited to:

(1)

Ashes;

(2)

Cinders;

(3)

Sand;

(4)

Mud;

(5)

Straw;

(6)

Shavings;

(7)

Metal;

(8)

Glass;

(9)

Rags;

(10)

Feathers;

(11)

Tar;

(12)

Plastics;

(13)

Wood;

(14)

Unground garbage;

(15)

Whole blood;

(16)

Paunch manure;

(17)

Hair and fleshings;

(18)

Entrails;

(19)

Paper products; either whole or ground by garbage grinders;

(20)

Slops;

(21)

Chemical residues;

(22)

Paint residues; and

(23)

Bulk solids.

(Code 1967, §§ 34-13—34-19, 34-53(d); Ord. No. 1765, § 1, 3-13-75; Ord. No. 6191, § 3, 3-26-92; Ord. No. 8118, § 1, 10-23-97; Ord. No. 10,322, § 7, 5-11-06)