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Detailed Analytical Report Analytica Environmental Laboratories, Inc. <br />Workorder (SDG): B1005139 <br />Project: M-1977-300 <br />Client: Colorado Division of Reclamation, Mining & Safety <br />went rrolect iNumoer: 11UHU <br />FOOTNOTES TO QC REPORT <br />Note 1: Results are shown to three significant figures to avoid rounding errors in calculations. <br />Note 2: If the sample concentration is greater than 4 times the spike level, a recovery is not meaningful, and the result <br />should be used as a replicate. In such cases the spike is not as high as expected random measurement variability of the <br />sample result itself. <br />Note 3: For sample duplicates, if the result is less than the PQL, the duplicate RPD is not applicable. If the sample and duplicate results are not <br />five times the PQL or greater, then the RPD is not expected to fall within the window shown and the comparison should be made on the basis of <br />the absolute difference. Analytica uses the criterion that the absolute difference should be less than the PQL for water or less than 2XPQL for <br />other matrices. <br />Note 4: For serial dilutions, if the result is less than the PQL, the duplicate RPD is not applicable. If the sample result is not 50 times the MDL <br />or greater, then the fact that the RPD does not meet the 10% criterion has little signifcance. Otherwise it indicates that a matrix bias may <br />exist at the analytical step. <br />Page 60 of 75