Industrial Wastewater Discharge Permit - Tri-Pac, Inc.

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Tri-Pac Inc. Industrial Wastewater Discharge Permit page 8 of 36 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. 3. Discharge Screening Level Limitations have been established to evaluate the need for a limitation for pollutants that are not listed in the Effluent Limitation section of the permit. If a permittee has no limit for a particular pollutant, but observes, through monitoring and analysis, a concentration of that pollutant greater than the listed Discharge Screening Level concentration found in the table below, the permittee shall notify the Control Authority. This notification shall be made in writing within five days of observing the pollutant concentration. Parameter Daily Maximum Screening Level (mg/L) Arsenic (mg/L) 0.2 Cadmium (mg/L) 0.1 Chromium (mg/L) 2.0 Copper (mg/L) 0.3 Lead (mg/L) 0.3 Nickel (mg/L) 0.3 Silver (mg/L) 0.2 Zinc (mg/L) 0.3