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STANDARD PROVISIONS AND REPORTING REQUIREMENTS -13 <br /> National Pollutant Discharge Elimination System <br /> and Qi 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 than 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 maximum 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 /> 7. 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 />