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different than those in the ICV, and a readback of the highest calibration <br />standazd. <br />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 are 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 batch. A filter <br />(method) blank was filtered and preserved at the same time as the samples for <br />the thallium batch. There were not more than 20 samples associated with each <br />filtered blank and laboratory control sample. <br />^ The preparation (method) blank associated with each preparation batch was <br />below the practical quantitation limit for each requested analyte. <br />^ The laboratory control sample associated with each prepazation batch was <br />within the acceptance limits. <br />r 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 />Per method requirements, matrix QC was performed for each analysis. Since a <br />sample from this order number was not the selected quality control (QC) sample, <br />matrix specific QC results are not included in this report. <br />10. It is a standard PA practice that samples for ICP-MS aze analyzed at a dilution. <br />PA sample ID 051 1113-2 required a dilution to bring selenium and thallium into <br />the analytical range of the ICP-MS. <br />2 <br />