§ 36-278. Prohibited discharge standards.

(a)

General prohibitions. No user shall introduce or cause to be introduced into the POTW any pollutant or wastewater which causes pass through or interference. These general prohibitions apply to all users of the POTW whether or not they are subject to categorical pretreatment standards or any other national, state or local pretreatment standards or requirements.

(b)

Specific prohibitions. No user shall introduce or cause to be introduced into the POTW the following pollutants, substances or wastewater:

(1)

Pollutants which create a fire or explosive hazard in the POTW including, but not limited to, waste streams with a closed-cup flashpoint of less than 140 degrees Fahrenheit (60 degrees Celsius) using the test methods specified in 40 CFR 261.21 including, but not limited to, gasoline, kerosene, naphtha, benzene, fuel oil, motor oil, mineral spirits, commercial solvents, toluene, xylene, ethers, alcohol, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides and hydrides;

(2)

Wastewater having a pH less than 6.0 or more than 10.0, or otherwise causing corrosive structural damage to the POTW or equipment including, but not limited to, concentrated acids or alkalies and high concentrations of compounds of sulfur, chlorine, and fluorine, and substances which may react with water to form strongly acidic or basic products;

(3)

Solid or viscous substances in amounts which will cause obstruction of the flow in the POTW resulting in interference but in no case solids greater than one-half inch in any dimension including, but not limited to, eggshells from egg processors, ashes, cinders, ceramic wastes, sand, mud, straw, shavings, thread, glass, rags, metal, feathers, bones, tar, plastics, wood, paunch manure, insulation materials, fibers of any kind, stock or poultry feeds, processed grains, viscera or other fleshy particles from processing or packing plants or lime or similar sludges;

(4)

Pollutants, including oxygen-demanding pollutants (BOD, etc.), released in a discharge at a flow rate or pollutant concentration which, either singly or by interaction with other pollutants, will cause interference with the POTW;

(5)

Wastewater having a temperature greater than 140 degrees Fahrenheit (60 degrees Celsius), or which will inhibit biological activity in the treatment plant resulting in interference, but in no case wastewater which causes the temperature at the introduction into the treatment plant to exceed 104 degrees Fahrenheit (40 degrees Celsius);

(6)

Petroleum oil, nonbiodegradable cutting oil or products of mineral oil origin, in amounts that will cause interference or pass through;

(7)

Pollutants which result in the presence of toxic gases, vapors or fumes within the POTW in a quantity that may cause acute worker health and safety problems;

(8)

Trucked or hauled pollutants, except at discharge points designated by the city manager;

(9)

Noxious or malodorous liquids, gases, solids or other wastewater which, either singly or by interaction with other wastes, are sufficient to create a public nuisance or a hazard to life, or to prevent entry into the sewers for maintenance or repair;

(10)

Wastewater which imparts color which cannot be removed by the treatment process such as, but not limited to, dye wastes and vegetable tanning solutions, which consequently imparts color to the treatment plant's effluent, thereby violating the city's NPDES permit;

(11)

Wastewater containing any radioactive wastes or isotopes except in compliance with applicable state or federal regulations;

(12)

Stormwater, surface water, groundwater, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water and noncontact cooling water unless specifically authorized by the city manager;

(13)

Sludges, screenings or other residues from the pretreatment of industrial wastes;

(14)

Medical wastes, except as specifically authorized by the city manager in a wastewater discharge permit;

(15)

Wastewater causing, alone or in conjunction with other sources, the treatment plant's effluent to fail a toxicity test;

(16)

Detergents, surface-active agents, or other substances which may cause excessive foaming in the POTW;

(17)

Fats, oils or greases of animal or vegetable origin in concentrations greater than 50 mg/l, or nonbiodegradable oil and grease in concentrations greater than 20 mg/l.

(18)

Wastewater causing two readings on an explosion hazard meter at the point of discharge into the POTW, or at any point in the POTW, of more than five percent or any single reading over ten percent of the lower explosive limit of the meter;

(19)

Any form of inflow including storm drainage and uncontaminated thermal process water;

(20)

Infiltration in excess of 200 gallons per inch of pipe diameter per mile of pipe per day;

(21)

Any substance which may cause wastewater treatment plant effluent or any other product of the POTW, such as residue, sludge or scum, to be unsuitable for reclamation and reuse or to interfere with the reclamation process. In no case shall a substance discharged to the POTW cause the system to be in noncompliance with sludge use or disposal criteria, guidelines or regulations developed by city, state or federal authorities; or

(22)

Any substance that will cause the POTW to violate its NPDES permit or the quality standards of the receiving stream.

Pollutants, substances or wastewater prohibited by this section shall not be processed or stored in a manner where they could be discharged to the POTW.

(Code 1989, § 10-31; Ord. of 10-2-1995, § 2.1)