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Apri! 22, 1999 • • Pagc 23 <br />6. S.2 Quality Control C/fecks-Lnbarnlory <br />The analytical laboratory analyzes QA/QC samples intemally. Blanks are run at least one <br />per sampling event. Matrix spiking is performed by the laboratory to measure recoveries ofanalytes <br />for comparison to the established accuracy objective. American Soda will request a QC report with <br />every analytical report received. <br />Matrix Spike Samples <br />A set of duplicate samples called matrix spike (MS)/matrix spike duplicates (MSD) samples <br />will be analyzed by the laboratory using a minimum of one in every 30 samples collected as part of <br />the internal monitoring program, including blanks and duplicates. The analysis of samples spiked <br />with a known amount of analyte will monitor possible matrix effects specific to the sample media. <br />Accuracy will be determined from the recovery rates of compounds (the matrix spike compounds <br />defined in the analytical methods), Precision will be assessed by comparison of matrix spike <br />recoveries of the duplicates. The addition of known concentrations of compounds/pazameters into <br />the sample also monitors extraction/digestion efficiency. These QA/QC samples aze processed <br />internally by the laboratory, and no additional field samples will be submitted for this procedure. , <br />Laboratory Blanks <br />The laboratory should process one blank sample for every 10-20 samples processed. This <br />data will be provided to American Soda in the laboratory QC report, and will be maintained with <br />project records. ` <br />6.6 External Quality Control Checks-Third-party Data Validation <br />The validity of the laboratory water quality data will be assessed annually by a third-party <br />analytical laboratory. American Soda intends to preferentially use the USGS analytical laboratory <br />facilities for third-party validation. Water quality samples will be collected by American Soda <br />personnel or USGS personnel, at the discretion of the USGS. The monitoring wells will be sampled <br />in a logical sequence, such that all wells are sampled equally. The third-party laboratory will analyze <br />parameters from WQ2 (Table 3) and prepare a report documenting the results. AColorado-certified <br />analytical laboratory that is not in any other way involved with the Yankee Gulch Section Minerals ~ <br />Project will be used as a secondary alternative to the USGS laboratory. <br />Agapito Associates, Inc. <br />