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to establish the calibration curve. The instrument software performs a linear <br />regression to fit the calibration data to a curve of the form: <br />conc. = B * I + C <br />where: conc. = concentration <br />B =slope coefficient <br />I =intensity <br />C =intercept coefficient <br />A printout summarizing the calibration data supplies the calibration curve and <br />correlation coefficient. During sample analysis both intensity and <br />concentration values aze printed. Dilutions are made for concentrations above <br />the highest calibration standazd. No results are taken from extrapolations <br />above the highest standazd. <br />6. All standazds and solutions aze NIST traceable and were used within their <br />recommended shelf life. <br />7. The sample was 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 preparation (method) blank grid laboratory control sample were digested and <br />analyzed with the samples in each digestion batch. There were not more than <br />20 samples in each digestion batch. <br />^ The preparation (method) blank associated with each digestion batch was <br />below the practical quantitation limit for each requested analyte. <br />^ The laboratory control sample associated with each digestion batch was within <br />the acceptance limits. This indicates complete digestion according to the <br />method. <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 />^ The interference check samples associated with Method 200.7 analyses were <br />within acceptance criteria. <br />9. Matrix specific quality control procedures. <br />PA sample ID 0407037-1 was designated as the quality control sample for the <br />ICP-MS and mercury analyses. Since a sample from this Order Number was not <br />000 C3 <br />