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a Daily Maximum Limit means the maximum allowable discharge limit of a <br />pollutant during a calendar day or any 24-hour period that represents a calendar <br />day. Where Daily Maximum Limits are expressed in units of mass, the daily <br />discharge is the total mass discharged over the course of the day. Where Daily <br />Maximum Limits are expressed in terms of a concentration, the daily discharge <br />is the arithmetic average measurement of the pollutant concentration derived <br />from all measurements taken that day. In the case of samples collected by the <br />grab method, the daily maximum shall be applied as an Instantaneous <br />Maximum Allowable Discharge Limit or as an Instantaneous Minimum <br />Allowable Discharge Limit as follows: <br />i. Instantaneous Maximum Allowable Dischar eL imit — shall mean the <br />maximum concentration or loading of a pollutant allowed to be <br />discharged at any time, determined from analysis of any discrete or <br />composite sample collected, independent of the industrial flow rate and <br />the duration of the sampling event. <br />ii. Instantaneous MinimLan Allowable Discharge Limit — shall mean the <br />minimum concentration of a pollutant allowed to be discharged at any <br />time, determined from analysis of any discrete or composite sample <br />collected, independent of the industrial flow rate and the duration of the <br />sampling event. The lower pH limit is applied as an Instantaneous <br />Minimum Allowable Discharge Limit. <br />b. Monthly nthly ..A eTage, Limit means the maximum allowable average of daily <br />discharges over a calendar month, calculated as the sum of the concentrations <br />of all daily discharges measured during a calendar month divided by the <br />number of daily discharges measured that month. <br />St. Joseph Energy Center Industrial Wastewater Discharge Permit page 2 of 39 <br />