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middle of the analytical range, a Continuing Calibration Verification (CCV) <br />standard with concentrations neaz the middle of the analytical range but <br />different than those in the ICV, and a readback ofthe Mghest calibration <br />standazd. <br />These solutions provide verification that the calibration equations are <br />functioning properly throughout the analytical range ofthe 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 standazd. <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 and <br />preserved at the same time as the samples for the selenium analysis. A filter <br />(method) blank was filtered and preserved at the same time as the samples for <br />the thallium analysis. There were not more than 20 samples associated with <br />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 laboratory control sample associated with the selenium batch was within <br />the acceptance limits, This indicates complete digestion according to the <br />method. <br />^ All initial and continuing calibration blanks associated with each analytical <br />batch were below the practical quantitation limits for the requested analytes. <br />^ All initial and continuing calibration verifications associated with each <br />analytical batch were within the acceptance criteria for the requested analytes. <br />This 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 0611009-1 was designated as the quality control sample for this analysis. <br />^ A matrix spike and matrix spike duplicate were prepazed and analyzed with this <br />batch. All acceptance criteria for accuracy were met. <br />^ A serial dilution was analyzed with the ICP-MS batch. All acceptance criteria <br />were met. <br />2 <br />