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DGM Environmental Monitoring QAPP <br /> QC accuracy and bias determination samples are discussed in some detail here to <br /> provide data reviewers of DGM environmental monitoring sample analytical reports <br /> insight for evaluating reported data. QA/QC samples are included in laboratory analysis <br /> to provide a basis for evaluation of the validity of the analytical data. The functions of <br /> the QC samples are to detect interference or biases and to provide an indication of <br /> analytical accuracy and precision. The third party laboratory must include at least one <br /> of each of the following QC samples associated with each 20 samples being analyzed <br /> in a sample batch preparation blank, laboratory control sample, spiked sample, and a <br /> duplicate sample. <br /> During and audit of the contracting laboratory, DGM personnel should be given access <br /> to review the labs statistical analyses of QC data related to the mine's environmental <br /> monitoring sample results. <br /> Page 18 <br />