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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 standard. <br />6. All standards and solutions aze 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, preserved and digested at the same time as <br />the samples. A laboratory control sample was created with the samples as they <br />were passed through the cation exchange column for selenium. There were <br />not more than 20 samples associated with each filtered blank and laboratory <br />control sample. <br />^ The preparation (method) blank associated with this batch was below the <br />practical quantitation limit for each requested analyte. <br />^ The laboratory control sample associated with this batch was within the <br />acceptance limits. This indicates the cation clean-up prior to the selenium <br />analysis was in control. <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 />PA sample ID 0408094-2 was designated as the quality control sample for these <br />analyses. <br />^ A matrix spike and matrix spike duplicate were digested and analyzed with this <br />batch. All acceptance criteria for accuracy were met. <br />^ A serial dilution was analyzed with this batch. All acceptance criteria were <br />met. <br />10. It is a standazd PA practice that samples for ICP-MS aze analyzed at a dilution. PA <br />sample ID 0408094-1 required a further dilution to bring selenium and thallium <br />into the analytical range of the ICP-MS. <br />