§ 56-112. Specific pollutant limitations.

(a)

No person shall discharge wastewater containing in excess of:

Pollutant		Discharge Limit
(1)	Inorganics:
	Arsenic	1.6 mg/L
	Cadmium	0.07 mg/L
	Chromium (total)	1.71 mg/L
	Copper	2.07 mg/L
	Cyanide	0.65 mg/L
	Lead	0.43 mg/L
	Mercury	No detectable discharge
	Nickel	2.38 mg/L
	Silver	0.24 mg/L
	Zinc	0.70 mg/L
(2)	Organics:
	Chloroform	0.0019 mg/L
	Trichloroethylene	0.0027 mg/L
	Tetracholorethylene (perchloroethylene)	0.0008 mg/L
	Phenols	0.300 mg/L
	Total toxic organics (TTO)	2.13 mg/L
(3)	General characteristics:
	Chlorine demand	15. mg/L
	Chemical oxygen demand (COD)	Surcharge above 450 mg/L
		Upper limit 2000 mg/L
	5-day biochemical oxygen demand (BOD5)	Surcharge above 200 mg/L
		Upper limit 1000 mg/L
	Suspended solids	Surcharge above 250 mg/L
		Upper limit 1000 mg/L
	Phosphorous (as P)	Surcharge above 10 mg/L
		Upper limit 100 mg/L
	Ammonia nitrogen (NH3 as N)	Surcharge above 20 mg/L
		Upper limit 100 mg/L
	Fats, oils, and grease	100. mg/L
	pH	Lower limit 5.5
		Upper limit 10.5
	Temperature (degrees F)	150° Maximum to sewer
		104° Maximum at Treatment Plant Influent

 

(b)

Any discharge subject to categorical pretreatment standards shall be subject to any and all limits applicable to that category in addition to the limits set forth in this section.

(c)

Individual samples with a concentration higher than the surcharge limit will be considered in violation of this division. Dischargers with an average monthly concentration exceeding a surcharge limit shall be assessed a surcharge based upon current and applicable costs associated with treating this concentrated waste. Discharges who are paying a surcharge shall not be considered in violation of this division unless the concentration of a pollutant (for which they are being assessed a surcharge) exceeds the upper limit for that pollutant.

(d)

Certain users discharging less than 5,000 gallons per day may, at the city's discretion, be assigned a revised limit for any parameter subject to a surcharge. The maximum revised limit in these instances would be the listed surcharge limit times the user's average daily flow in gallons divided by 5,000. In no case shall the revised limit exceed the listed upper limit.

(Code 1984, § 30-102; Ord. No. 482, § 2.4, 1-22-1985; Ord. No. 546, § 8, 12-22-1992)