§ 5.10.040. Specific pollutant limitations.

(a)

Industrial discharge limits for the following pollutants shall be determined by the director on a case by case basis. In no instance shall the total allocation for all industrial users exceed the maximum allowable industrial loadings as shown below:

Parameter	Maximum Allowable Industrial Loading (lbs./day)
Arsenic	2.13
Cadmium	0.16
Total Chromium	14.4
Copper	9.3
Cyanide	1.07
Lead	1.3
Mercury	0.18
Molybdenum	0.92
Nickel	7.19
Selenium	1.26
Silver	4.09
Zinc	12.4
BOD5	20,560
TSS	18,700

 

(b)

The admission into the public sewers of any waters or wastes having: (1) a five-day biochemical oxygen demand greater than three hundred fifty (350) parts per million by weight, or (2) containing more than three hundred fifty (350) parts per million by weight of suspended solids, or (3) containing more than one hundred (100) parts per million by weight of HEM (petroleum or mineral oil products), or (4) containing any quantity of substances having the characteristics described in Section 5.10.020, or (5) having an average daily flow greater than two per cent of the average daily sewer flow of the city shall be subject to the review and approval of the director.

The city may, where deemed necessary, set additional surcharges by ordinance as needed for higher concentrations of TSS, BOD, and HEM than previously set forth.

Where necessary in the opinion of the director, the owner shall provide, at his or her expense, such preliminary treatment as may be necessary to: (1) reduce the biochemical oxygen demand and the suspended solids to three hundred fifty (350) parts per million and the oil and/or grease to one hundred (100) parts per million, or (2) reduce the objectionable characteristics or constituents to within the maximum limits provided or in Section 5.10.020, or (3) control the quantities or rates of discharge of such waters or wastes. Plans, specifications and any other pertinent information relating to proposed preliminary treatment facilities shall be submitted for the approval of the city and of the department of health of the state of Iowa, and no construction of such facilities shall be commenced until said approvals are obtained in writing.

(Ord. 5123 § 2 (part), 1993).

(Ord. No. 6227, § 3, 3-9-2015; Ord. No. 6282, § 2, 10-10-2016).