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PART I <br />Page 9 of 22 <br />Permit No.: CO-0001244 <br />The MWAT is calculated by averaging all temperature data points collected during a calendar day, and then averaging the <br />daily average temperatures for 7 consecutive days. This 7 day averaging period is a rolling average, i.e. on the 81' day, the <br />MWAT will be the averages of the daily averages of days 2-8. The value to be reported on the DMR is the highest of all the <br />rolling 7-day averages throughout the month. For those days that are at the endibeginning of the month, the data shall be <br />reported for the month that contains 4 of the 7 days. <br />Day 1: Average of all temperature data collected during the calendar day. <br />Day 2: Average of all temperature data collected during the calendar day. <br />Day 3: Average of all temperature data collected during the calendar day. <br />Day 4: Average of all temperature data collected during the calendar day. <br />Day 5: Average of all temperature data collected during the calendar day. <br />Day 6: Average of all temperature data collected during the calendar day. <br />Day 7: Average of all temperature data collected during the calendar day. <br />0 MWAT Calculation as average of previous 7 days <br />Day 8: Average of all temperature data collected during the calendar day. <br />2nd MWAT Calculation as average of previous 7 days <br />Day 9: Average of all temperature data collected during the calendar day. <br />3rd MWAT Calculation as average of previous 7 days <br />14. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standards and Methodologies for Surface Water 1002-31, <br />as that portion of a constituent measured from the filtrate of a water and suspended sediment sample that was first treated with <br />nitric acid to a pH of 2 or less and let stand for 8 to 96 hours prior to sample filtration using a 0.40 or 0.45-UM (micron) <br />membrane filter. Note the "potentially dissolved" method cannot be used where nitric acid will interfere with the analytical <br />procedure used for the constituent measured. <br />15. "Quarterly measurement frequency" means samples may be collected at any time during the calendar quarter if a continual <br />discharge occurs. If the discharge is intermittent, then samples shall be collected during the period that discharge occurs. <br />16. "Recorder" requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump hour meters <br />where previously approved.) <br />17. "Seven (7) day average" means, with the exception of fecal coliform or E. coli bacteria (see geometric mean), the arithmetic <br />mean of all samples collected in a seven (7) consecutive day period. When calculating the 7-day average, a value of zero <br />should be used in place of any value that is less than the reporting limit. If all values are less than the PQL, and the PQL is <br />greater than the permit limit "BDL" should be reported. If all values are less than the PQL, and the PQL is less than <br />or equal to the permit limit, "<x" should be reported, where "x" is the reporting limit. Otherwise, the calculated <br />average shall be reported. Note that it does not matter if a calculated average is greater or less than the PQL, it must <br />be reported as a value. Such seven (7) day averages shall be calculated for all calendar weeks, which are defined as <br />beginning on Sunday and ending on Saturday. If the calendar week overlaps two months (i.e. the Sunday is in one month and <br />the Saturday in the following month), the seven (7) day average calculated for that calendar week shall be associated with the <br />month that contains the Saturday. Samples may not be used for more than one (1) reporting period. <br />18. "Thirty (30) day average" means, except for fecal coliform or E. coli bacteria (see geometric mean), the arithmetic mean of all <br />samples collected during a thirty (30) consecutive-day period. When calculating the 30-day average, a value of zero should <br />be used in place of any value that is less than the PQL. If all values are less than the PQL, and the PQL is greater than <br />the permit limit "BDL" should be reported. If all values are less than the PQL, and the PQL is less than or equal to <br />the permit limit, "<x" should be reported, where "x" is the reporting limit. Otherwise, the calculated average shall be <br />reported. Note that it does not matter if a calculated average is greater or less than the PQL, it must be reported as a <br />value. The permittee shall report the appropriate mean of all self-monitoring sample data collected during the calendar month <br />on the Discharge Monitoring Reports. Samples shall not be used for more than one (1) reporting period. <br />19. "Total Inorganic Nitrogen (T.I.N.)" is an aggregate parameter determined based on ammonia, nitrate and nitrite <br />concentrations. Given that there are no approved analytical procedures for determining T.I.N. itself as an aggregate <br />parameter, daily maximum and 30-day average concentrations for T.I.N. shall be determined using the calculated T.I.N. <br />concentrations versus T.I.N. analytical results. Specifically, the facility must monitor for total ammonia and total nitrate plus <br />nitrite on the same days. The calculated T.I.N. concentrations in mg/L shall then be determined as the sum of the analytical <br />results of same-day sampling for total ammonia (as N) in mg/L, and total nitrate plus nitrite (as N) in mg/L. From these