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These solutions provide verification that the calibration 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 standazd. <br />6. All standards and solutions are NIST traceable and were used within their <br />recommended shelf life. <br />7. The samples were prepared 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 was filtered and preserved at the same time as the <br />samples. There were not more than 20 samples associated with each filtered <br />blank. <br />^ The prepazation (method) blank associated with each preparation batch was <br />below the practical quantitation limit for each requested analyze. <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 0409105-2 was designated as the quality control sample for the thallium <br />analysis. Per method requirements, tnatrix QC was performed for each analysis. <br />Since a sample from this Order Number was not the selected quality control (QC) <br />sample, matrix specific QC results for the selenium analysis aze not included in this <br />report. <br />^ A matrix spike and matrix spike duplicate were analyzed with the thallium <br />batch. All acceptance criteria for accuracy were met. <br />^ A matrix spike duplicate was analyzed with the thallium batch. Al] acceptance <br />criteria for precision were met. <br />^ A serial dilution was analyzed with the thallium batch. All acceptance criteria <br />were met. <br />10. It is a standard PA practice that samples for ICP-MS are analyzed at a dilution. <br />2 <br />