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standazd from a 2nd source standazd solution with concentration's neaz the <br />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 of the highest calibration <br />standazd. " <br />These solutions provide verification that the calibrafion equations aze <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 aze 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. '~I <br />^ A filter (method) blank was filtered and preserved at the same time as the <br />samples. A laboratory control sample was prepared and analytied with the <br />samples in the selenium batch. There were not more than 20 samples <br />associated with each filtered blank and laboratory control sample. <br />^ The preparation (method) blank associated with each prepazation batch was <br />below the practical quantitation Limit for each requested analyte. <br />^ The laboratory control sample associated with the selenium preparation batch <br />was within the acceptance limits. This indicates complete digestion according <br />to the method. <br />^ All initial and continuing calibration blanks associated with each analytical <br />batch were below the practical quantitation ]units 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 cahbration and stable instrument conditions. <br />^ The interference check samples associated with Method 200.81'Iwere analyzed. <br />9. Matrix specific quality control procedures. <br />Sample 0508300-3 was designated as the quality control sample for each analysis. <br />Similarity of matrix and therefore relevance of the QC results should not be <br />automatically inferred for any sample other than the native sample, selected for QC. <br />^ A matrix spike and matrix spike duplicate were prepazed and analyzed with <br />each batch. All acceptance criteria for accuracy were met. <br />^ A matrix spike duplicate was prepared and analyzed with each batch. All <br />acceptance criteria for precision were met. <br />2 <br />