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STANDARD PROVISIONS AND REPORTING REQUIREMENTS <br />National Pollutant Discharge Elimination System <br />-13 <br />and Q; is the average flow rate occurring during the period over <br />which samples are composited.. <br />2. The monthly or weekly average discharge rate is the total of daily <br />discharge rates during a calendar month or week, divided by the <br />number of days in the month or week that the facility was <br />discharging. <br />Where less yhan daily sampling is required by this permit, the <br />monthly or weekly average discharge rate shall be determined by the <br />summation of all the daily discharge rates divided by the number of <br />days during the month or week for which the rates are available. <br />For other than weekly or monthly periods, compliance shall be based <br />upon the average of all rates available during the specified period. <br />3. The monthly or weekly average concentration is the arithmetic mean of <br />measurements made during a calendar month or week, respectively. <br />4. The daily maximum discharge rate means the total discharge by weight <br />during one day. <br />5. The daily maximus concentration is the greatest concentration found <br />in grab or composite samples analyzed for one day. <br />6. A grab sample is an individual sample collected in less than 15 <br />minutes. <br />1. Unless otherwise specified, a composite sample is a combination of <br />individual samples collected over the specified sampling period: <br />a. at equal time intervals, with a maximum interval of one hour, and <br />b. at varying time intervals (average interval one hour or less) so <br />that each sample represents an equal portion of the cumulative <br />flow. <br />The duration of the sampling period shall be specified in the <br />Monitoring and Reporting Program. The method of compositing shall be <br />reported with the results. <br />8. Sludge means the solids, residues, and precipitates separated from, <br />or created in, wastewater by the unit processes of a treatment <br />system. <br />9. Median is the value below which half the samples (ranked <br />progressively by increasing value) fall. It may be considered the <br />middle value, or the average of the two middle values. <br />