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middle of the analytical range, a Continuing Calibration Verification (CCV) <br />standazd with concentrations near the middle of the analytical range but <br />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 standazd. <br />6. All standards and solutions are NISI 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 pmcedures were followed, as described below. <br />8. Genera] quality control procedures. <br />^ A filter (method) blank and laboratory control sample were filtered, preserved <br />and prepared at the same time as the samples. There were not more than 20 <br />samples associated with each filtered blank and laboratory control sample. The <br />laboratory control sample was only prepared for the selenium analysis. <br />^ The preparation (method) blank associated with each batch was below the <br />practical quantization limit for each requested analyte. <br />^ The laboratory control sample associated with the selenium batch was within <br />the acceptance limits. <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 analyzes. <br />This indicates a valid cahbration 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 this 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 standazd PA practice that samples for ICP-MS are analyzed at a dilution. <br />Sample 0509241-2 required additional dilutions to bring selenium and thallium into <br />the analytical range ofthe ICP-MS. <br />