§ 8.05.060. PROHIBITED DISCHARGES AND DISCHARGE LIMITS.

A. No discharge will be allowed into the sewer system or POTW with quantities in excess of the maximum limits shown in the following table:

CONSTITUENT OR POLLUTANT

MAXIMUM ALLOWABLE LIMIT

Cadmium	0.08 mg/l
Chromium	0.90 mg/l
Copper	2.00 mg/l
Lead	0.50 mg/l
Nickel	1.20 mg/l
Zinc	2.15 mg/l
Arsenic	0.80 mg/l
Cyanide	0.01 mg/l
Silver	1.25 mg/l
Mercury	0.05 mg/l
Selenium	0.08 mg/l
Barium	1.00 mg/l
Manganese	10.00 mg/l
Boron	5.00 mg/l
Phenol	0.05 mg/l
Total Grease	100.00 mg/l
Dissolved Sulfides	0.05 mg/l
(milligrams per liter)

B. No discharge will be allowed into the sewer system or POTW, which contains:

1. Any radiological, chemical or biological warfare agent;

2. Any gasoline, benzene, naphtha, solvent, fuel oil, or any liquid, solid, or gas that will cause flammable or explosive conditions to result in the sewerage system, or a pollutant with closed cup flashpoint of less than 140° F;

3. Waste which will cause corrosive structural damage to treatment works or result in a hazard to structures, equipment or personnel, but in no case with a pH lower than 5.5 standard units nor higher than 9.0 standard units. Where a permittee is required by its permit to continuously monitor its pH discharge over a 30-day period the permittee shall maintain the pH of such wastewater within the range set forth in its permit, except that excursions from the range are permitted subject to the following limitations:

a. The total time during which the pH values are outside the required range of pH values shall not exceed 7 hours and 26 minutes in any calendar month;

b. No individual excursion from the range of pH values shall exceed 60 minutes;

c. For purposes of this section, an “excursion” is an unintentional and temporary incident in which the pH value of discharged wastewater exceeds the range set forth in the permit.

4. Solids or viscous substances of such size or in such quantity, which will cause obstruction of flow in the sewer or cause interference with the collection system or wastewater treatment plant operations. These objectionable substances include, but are not limited to, asphalt, dead animals, offal, ashes, sand, mud, straw, industrial process shavings, metal, glass, rags, milk, feathers, tar, plastics, wood, whole blood, paunch manure, bones, hair and fleshings, entrails, paper dishes, paper cups, milk containers or other similar paper products, either whole or ground;

5. Wastes which exceed the discharge limitations as listed in this code;

6. Any water added for the purpose of diluting wastes which would otherwise exceed applicable maximum concentration limitations;

7. Any single-pass cooling waters in excess of 1 gpm;

8. Any boiler blow off exceeding one-third of the make-up water;

9. Deionized water, steam condensate or distilled water in excess of 1 gpm;

10. Any substance that results in toxic gases, vapors, and fumes that may cause acute worker health and safety problems;

11. Any quantity of wastes that causes interference with the disinfection operation of the POTW;

12. Any waste producing excessive discoloration of wastewater or treatment plant effluent;

13. Any recognizable portions of the human anatomy;

14. Any wastewater containing toxic pollutants in sufficient quantity, either singly or by interaction with other pollutants, to injure or interfere with any wastewater treatment process, constitutes a hazard to humans or animals, creates a toxic effect in the receiving waters of the POTW, or to exceed the limitation of similar paper products, either whole or ground, or to exceed the limitation set forth in the categorical pretreatment standard. A toxic pollutant shall include, but not be limited to, any pollutant identified pursuant to Section 307(a) of the Act;

15. Any discharge which will cause interference with POTW operations, reuse, AZPDES permit, Aquifer Protection permit or the water quality standards for receiving water;

16. Any waste having a temperature of 120° F or higher at the discharge point, or which causes the treatment works influent to exceed 104° F;

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

18. Any discharge which the Director determines is inconsistent with the rules, regulations and ordinances promulgated by the City Council.

C. Hospitals, clinics, offices of medical doctors, and convalescent homes, shall not discharge to the sewer by any means:

1. Disposable hypodermic needles, syringes and associated articles.

2. Infectious wastes defined as:

a. Laboratory and surgical room wastes.

b. Wastes from outpatient areas and emergency rooms similar to those included above.

c. Equipment, instruments, utensils and other materials of a disposable nature that may harbor or transmit pathogenic organisms and that are used in the rooms of patients having a suspected or diagnosed communicable disease which by the nature of the disease is required to be isolated by public health agencies.

3. Solid wastes generated in the rooms of patients who are isolated because of a suspected or diagnosed communicable disease.

4. All solid wastes not included in A. above.

D. Nothing in this section shall be construed to limit the authority of the Health Officer of the county to define wastes as being infectious and, with the concurrence of the Director, to prohibit their discharge to the sewer.

E. The department reserves the right to inspect any existing lateral or collecting sewers that discharge wastewater directly or indirectly to trunk sewers.

1. If it is found that such lateral or collecting sewers are improperly used or improperly maintained, thereby causing discharge of wastewater, excessive groundwater, debris or any other objectionable substance to the city sewers, the department will give notice of the unsatisfactory condition to the offending discharger and shall direct the condition be corrected.

2. In cases of continued noncompliance with the department directive, the department may disconnect the offending user from city sewer system and/or water supply.

(Ord. 09-989, passed 9-8-2009; Ord. 932, passed 8-26-2008)