§ 26-89. Pretreatment.

(a)

All industrial and commercial process wastewater shall be pretreated prior to discharge to the public sewers, if necessary, in accordance with the provisions of the United States Environmental Protection Agency, the bureau of pollution control, and/or the city whichever is more stringent. The minimum pretreatment requirements are as follows:

Parameter	Maximum Concentration (mg/l)
5-day biochemical oxygen demand (BOD)	300.0
Suspended solids (SS)	300.0
Total Kjeldahl nitrogen (TKN)	40.0
Oil and grease (O&G)	50.0
Arsenic	0.05
Barium	1.00
Boron	1.00
Cadmium	0.05
Chromium	0.15
Copper	1.00/0.30/0.10*
Cyanide	0.10
Lead	0.10
Mercury	0.02
Nickel	0.3
Selenium	0.05
Silver	0.24
Zinc	1.50/0.50/0.20*

 

*For copper and zinc, the maximum concentration (mg/L) is determined by whether the discharger is classified as a minor discharger (less than ten thousand (10,000) gallons of wastewater per day), moderate discharger (between ten thousand (10,000) gallons of wastewater per day). For these metals in the list above, the first number is the maximum concentration for minor dischargers, the second is for moderate dischargers, and the third is for major dischargers.

(b)

As a condition for authorization to dispose of industrial wastes through the municipal system, the industrial applicant for a sewer permit shall provide the city with information describing wastewater constituents and characteristics, and the type of activity and quantity of production.

(Ord. of 2-1-83, Art. V, § 5; Ord. of 12-19-06, § 4; Ord. of 10-16-07, § 1)