Industrial WW Discharge Permit Renewal - Somaschini North America, LLC

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Somaschini North America, LLC Industrial Wastewater Discharge Permit page 8 of 45 Please be aware that Federal Categorical Limits are still in effect as required by 40 CFR 433.17. For pollutants that do not have local limits in the table above, the permittee is still required to comply with any applicable categorical standard, below. Parameter Daily Maximum Limit (mg/L) Monthly Average Limit (mg/L) Cadmium (mg/L) 0.11 0.07 Chromium (mg/L) 2.77 1.71 Copper (mg/L) 3.38 2.07 Lead (mg/L) 0.69 0.43 Nickel (mg/L) 3.98 2.38 Silver (mg/L) 0.43 0.24 Zinc (mg/L) 2.61 1.48 a. Daily Maximum Limit means the maximum allowable discharge limit of a pollutant during a calendar day or any 24-hour period that represents a calendar day. Where Daily Maximum Limits are expressed in units of mass, the daily discharge is the total mass discharged over the course of the day. Where Daily Maximum Limits are expressed in terms of a concentration, the daily discharge is the arithmetic average measurement of the pollutant concentration derived from all measurements taken that day. In the case of samples collected by the grab method, the daily maximum shall be applied as an Instantaneous Maximum Allowable Discharge Limit or as an Instantaneous Minimum Allowable Discharge Limit as follows: i. Instantaneous Maximum Allowable Discharge Limit – shall mean the maximum concentration or loading of a pollutant allowed to be discharged at any time, determined from analysis of any discrete or composite sample collected, independent of the industrial flow rate and the duration of the sampling event. ii. Instantaneous Minimum Allowable Discharge Limit – shall mean the minimum concentration of a pollutant allowed to be discharged at any time, determined from analysis of any discrete or composite sample collected, independent of the industrial flow rate and the duration of the sampling event. The lower pH limit is applied as an Instantaneous Minimum Allowable Discharge Limit. b. Monthly Average Limit means the maximum allowable average of daily discharges over a calendar month, calculated as the sum of the concentrations of all daily discharges measured during a calendar month divided by the number of daily discharges measured that month.