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A. No user may introduce or cause to be introduced into the POTW any pollutant, substance, or wastewater that can cause pass-through or interference. Pollutants, substances, or wastewater prohibited by this section may not be processed or stored in such a manner that it could be discharged to the POTW. It is unlawful for any user to discharge or cause to be discharged to the POTW any of the following:

1. Unless otherwise approved by the Director, any stormwater, surface water, groundwater, roof runoff, surface drainage, or unpolluted water that constitutes inflow as defined herein;

2. Pollutants that create a fire or explosion hazard to the POTW; in no case may pollutants be discharged with a closed cup flashpoint less than 140 degrees Fahrenheit (60 degrees centigrade) or that cause an exceedance of ten percent of the lower explosive limit (LEL) at any point within the POTW for any single reading or more than five percent for any two consecutive readings;

3. Solid or viscous pollutants, FOG, petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin that can cause interference or pass-through or that can cause obstruction to the flow in sewers or other damage to the POTW;

4. Water or waste containing toxic, radioactive, poisonous, or other substances in sufficient quantity to cause or have the potential to cause injury or interference within the POTW, cause corrosive structural damage, constitute a hazard to humans, or create any hazard to the POTW, or in the receiving waters of the POTW, or pollutants that result in the presence of toxic gases, vapors, or fumes within the POTW in a quantity that poses a threat to worker health and safety;

5. Water with a pH less than 5.0 standard units (S.U.) or greater than 10.5 S.U.;

6. Water with a temperature greater than 150 degrees Fahrenheit (66 degrees centigrade) or heat in amounts that will inhibit biological activity in the POTW resulting in interference, but in no event heat in such quantities that the temperature at the headworks of the wastewater treatment plant exceeds 104 degrees Fahrenheit (40 degrees centigrade);

7. Water or waste that has in any way been diluted by means of increasing the use of process water or other water as a partial or complete substitute for effective pretreatment, for the purpose of obtaining compliance with any discharge limit, categorical standard, or pretreatment requirement imposed by this chapter except where dilution is expressly authorized by a pretreatment standard or requirement; the Director may impose mass limits on the users that are using dilution to meet pretreatment requirements, or in other cases where the imposition of mass limits is appropriate;

8. Water or waste that could cause a violation of any categorical standard or pretreatment requirement;

9. Water or waste that is transported from the point of generation to the POTW by any septic tank pumper, or chemical waste hauler, or similarly transported unless the transporter has first:

a. Disclosed to the Director the origin, nature, concentration, and volume of all pollutants to be discharged; and

b. Obtained the written consent of the Director to discharge;

10. Pollutants, including oxygen demanding pollutants (BOD, etc.) released in a discharge at a flow rate or pollutant concentration that either by itself, or through interaction with other pollutants, could cause interference with POTW operations or pass-through;

11. Any discharge that exhibits a characteristic of a hazardous waste, or contains a substance that is listed as a hazardous waste pursuant to either Arizona Administrative Code R18-8-261, as amended, or 40 CFR Part 261, as amended, whichever is applicable, whether or not the discharge is otherwise subject to hazardous waste regulations;

12. Water or waste exceeding the limits for the following substances that are expressed in the total form except if otherwise stated:

Instantaneous Effluent Limit

Substance

Limit (mg/L*)

Benzene

0.035

Chloroform

2.0

*milligrams per liter

13. Any of the following prohibited substances:

4,4'—DDE

4,4'—DDT

Aldrin

BHC-alpha

BHC-beta

BHC-gamma (Lindane)

Heptachlor

Heptachlor expoxide

Polychlorinated biphenyl compounds (PCB);

14. Noxious or malodorous liquids, gases, solids, or other wastewater that, either by itself or through interaction with other wastes, is sufficient to create a public nuisance or hazard to life, or prevent entry into the sewers for maintenance or repair;

15. Wastewater that imparts color which cannot be removed by the treatment process, such as, but not limited to, dye waste and vegetable tanning solution, which consequently imparts color to the treatment plant’s effluent thereby violating a NPDES or AZPDES permit issued to the City;

16. Sludges, screenings, or other residuals from the pretreatment of industrial wastes;

17. Medical wastes, except as specifically authorized by the Director in an individual wastewater discharge permit;

18. Detergents, surface-active agents, or other substances that result in excessive foaming in the POTW; and

19. Wastewater causing, alone or in conjunction with other sources, the treatment plant effluent to fail toxicity testing.

B. The Director has established the following local limits to protect against pass-through and interference at the POTW:

1. No person may discharge any water or waste exceeding the limits for the following daily maximum limits;

2. The limits below apply at the point where the wastewater is discharged to the POTW; all concentrations for metallic substances are for total metal unless indicated otherwise; the Director may impose mass limits in addition to the concentration-based limits below:

DAILY MAXIMUM LIMITS

Substance

Limit (mg/L*)

Arsenic

0.13

Cadmium

0.047

Copper

1.5

Cyanide

2.0

Lead

0.41

Mercury

0.0023

Selenium

0.10

Silver

1.2

Zinc

3.5

*mg/L = milligrams per liter

(Ord. No. G-1935, § 2; Ord. No. G-2489, § 2; Ord. No. G-3384, § 1; Ord. No. G-3662, § 1; Ord. No. G-4635, § 1b, 2004; Ord. No. G-6740, § 1, 2020)