§ 41-29. Inadmissible discharges.

(a)

General prohibitions. No person shall introduce or cause to be introduced into the POTW any pollutant or wastewater which causes overload, 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 person shall introduce or cause to be introduced into the POTW the following pollutants, substances, or wastewater:

(1)

Hydrocarbons, flammable and explosive chemicals any gasoline, benzene, naphtha, fuel oil, or other flammable or explosive liquid, solid, or gas that exhibits a flash point less than one hundred forty (140) degrees Fahrenheit (sixty (60) degrees Celsius) using the test methods specified in 40 CFR 261.21 or a concentration that allows the atmospheric concentration to exceed ten (10) percent of the lower explosive limit;

(2)

Wastewater having corrosive properties capable of causing damage or injury to structures, equipment and/or personnel of the POTW, as per the specific prohibition in the applicable local limits in Section 41-29(b)(25). In no case shall wastewater containing a pH of less than 5.5 be discharged unless the POTW is specifically designed to accommodate such discharges;

(3)

Solid or viscous substances in amounts which may cause obstruction of the flow in the POTW resulting in interference, blockage, or damage to the POTW;

(4)

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

(5)

Wastewater having a temperature greater than one hundred fifty (150) degrees Fahrenheit (sixty-five (65) degrees Celsius), or which may inhibit biological activity in the treatment plant resulting in interference, but in no case wastewater which may cause the temperature at the introduction into the treatment plant to exceed one hundred four (104) degrees Fahrenheit (forty (40) degrees Celsius);

(6)

Petroleum oil, non-biodegradable cutting oil or products of mineral oil origin, or fats, oils, or greases of animal or vegetable origin in concentrations greater than that specified in the applicable local limit in Section 41-29(b)(25);

(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;

(8)

Trucked or hauled pollutants, except at discharge points designated by director and TRA in compliance with section 41-47(d);

(9)

Noxious or malodorous liquids, gases, solids, or other wastewater which, either singly or by interaction with other wastes, may be 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 may not be removed by the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions;

(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 unpolluted wastewater, unless specifically authorized by the director;

(13)

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

(14)

Medical wastes, except as specifically authorized by the director and TRA 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)

A discharge of water, normal domestic wastewater, or industrial waste which in quantity of flow exceeds, for a duration of longer than fifteen (15) minutes, more than four (4) times the average twenty-four-hour flow during normal operations;

(18)

Insecticides and herbicides in concentrations that may not be amenable to treatment;

(19)

Polychlorinated biphenyls;

(20)

Garbage other than properly shredded garbage;

(21)

Wastewater or industrial waste generated or produced outside the city, unless approval, in writing, has been given by the director to the person discharging the waste;

(22)

Any material, chemical, or substance that exceeds standards set by any federal or state agency having authority to establish such standards such as but not limited to the federal categorical pretreatment standards;

(23)

Miscellaneous materials which may exert or cause:

a.

Concentrations of total suspended solids greater than two hundred fifty (250) mg/l (such as, but not limited to, fuller's earth, lime slurries, and lime residues) unless approved by the director;

b.

Concentrations of BOD greater than two hundred fifty (250) mg/l unless approved by the director; or

c.

Volume of flow or concentration of wastes constituting "slugs."

(24)

Pretreatment chemicals or other additives including but not limited to biological agents, used in any pretreatment system or device not approved by the director prior to being used. This includes but is not limited to materials added to grease traps, grit traps or septic tanks;

(25)

Any waters or wastes containing obnoxious, toxic or poisonous solids, liquids or gases in sufficient quantity, either singly or by interaction with other wastes, that may injure or interfere with any wastewater treatment process, cause acute worker health and safety problems, constitute a hazard to humans or animals, create a public nuisance, or create any hazard in the receiving waters of the wastewater treatment plant, including, but not limited to, the following pollutants:

TOXIC POLLUTANT	TRA CENTRAL INSTANTANEOUS MAX.
	Limits(mg/l)
Arsenic	0.2
Cadmium	0.1
Chromium (total)	2.9
Copper	2.3
Cyanide	0.5
Lead	0.9
Mercury	0.0004
Molybdenum	0.8
Nickel	4.6
Selenium	0.1
Silver	0.8
Zinc	8.0
Oil and Grease	200
Total Toxic Organics	2.13
pH	5.5 to 11.0 Standard Units

 

Concentration limits apply at the point where the wastewater is discharged to the sewage system unless otherwise specified. All concentrations for metallic substances are the "total" metals unless indicated otherwise. At the discretion of city, mass limitations may be imposed in addition to or in place of the concentration based limitations above.

(c)

Upon the promulgation of any federal categorical pretreatment standards for a particular industrial subcategory, the federal standard, if more stringent than limitations imposed under this chapter for sources in the subcategory, shall immediately supersede the limitations imposed under this chapter. It is the responsibility of each person to be knowledgeable of all regulations applicable to him or her. Failure of the city to identify new persons or to notify existing persons of new federal regulations does not in any way relieve the person of the duty to comply. The national categorical pretreatment standards found in 40 CFR chapter I, subchapter N, parts 405-471 are incorporated in this chapter for all purposes.

(d)

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

(Ord. No. 8140, § 1, 3-20-03; Ord. No. 2013-9523, § 1, 11-7-13)