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PART I <br />Page 28 of 52 <br />Permit No.: C00000906 <br />Calculating Averages <br />In the calculation of average concentrations (i.e. daily average, 7- day average, 30 -day average, 2 -year rolling <br />average) any individual analytical result that is less than the PQL shall be considered to be zero for the <br />calculation purposes. When reporting: <br />If all individual analytical results are less than the PQL, the permittee shall report either "BDL" or "<X" <br />(where X = the actual PQL achieved by the laboratory), following the guidance above. <br />If one or more individual results is greater than the PQL, an average shall be calculated and reported. <br />Note that it does not matter if the final calculated average is greater or less than the PQL, it must be <br />reported as a value. <br />PQLs <br />The PQLs for specific parameters, as determined by the State Laboratory (November 2008) are provided below <br />for reference. If the analytical method cannot achieve a PQL that is less than or equal to the permit limit, <br />then the method, or a more precise method, must achieve a PQL that is less than or equal to the PQL in the <br />table below. A listing of the PQLs for further organic parameters that must meet the above requirement can <br />be found in the Division's Practical Quantitation Limitation Guidance Document, July 2008. This document is <br />available on the Division's website at www.coloradowaterDermits.com. <br />These limits apply to the total recoverable or the potentially dissolved fraction of metals. <br />For hexavalent chromium, samples must be unacidified so dissolved concentrations will be measured rather <br />than potentially dissolved concentrations. <br />