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different than those in the ICV, and a readback of the highest calibration <br />standard. <br />These solutions provide verification that the cahbration equations are <br />functioning properly throughout the analytical range of the instrument. During <br />sample analysis dilutions are made for analytes found at concentrations above <br />the highest calibration standard. No results are taken from extrapolations <br />beyond the highest standard. <br />6. All standazds and solutions aze NIST traceable and were used within their <br />recommended shelf life. <br />7. The samples were prepazed and analyzed within the established hold times. <br />All in house quality control procedures were followed, as described below. <br />8. General quality control procedures. <br />^ A filter (method) blank and laboratory control sample were filtered, preserved <br />and prepazed at the same time as the samples for the selenium analysis. A filter <br />(method) blank was filtered, preserved and prepared at the same time as the <br />samples for the thallium analysis. There were not more than 20 samples <br />associated with each filtered blank and laboratory control sample. <br />^ The preparation (method) blank associated with each batch was below the <br />practical quantitation limit for each requested analyte. <br />^ -The ]aboratory control sample associated with the selenium batch was within <br />the acceptance limits. <br />^ All initial and continuing calibration blanks associated with this analytical batch <br />were below the practical quantitation limits for the requested analytes. <br />^ All initial and continuing calibration verifications associated with this analytical <br />batch were within the acceptance criteria for the requested analytes. This <br />indicates a valid calibration and stable instrument conditions. <br />^ The interference check samples associated with Method 200.8 were analyzed. <br />9. Matrix specific quality control procedures. <br />Sample 0512199-I was designated as the quality control sample for each analysis. <br />Similarity of matrix and therefore relevance of the QC results should not be <br />automatically inferred for any sample other than the native sample se]ected for QC. <br />^ A matrix spike and matrix spike duplicate were prepared and analyzed with <br />each batch. All acceptance criteria for accuracy were met with the following <br />exceptions: <br />Anal e Sample ID <br />Thallium 0512199-1MS & MSD <br />The native sample result is flagged for matrix spike failure. <br />