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July 16, 2004 Lab ID SP 406522 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Explanations <br /> 414 Relative Percent Difference (RPD) not within Maximum Allowable Vatue (MAV) Data was accepted <br />' based on the LCS or CCV recovery <br /> 435 Sample matrix may be affecting this analyte Data was accepted based on the LCS or CCV recovery <br /> Definitions <br /> Blank Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples <br /> BS/BSD Blank Spikes - A blank is spiked with a known amount of analyte It is prepared to verify that the preparation <br /> process is not affecting analyte recovery <br /> CCV Continuing Calibration Verification - Analyzed to verify the instrument calibration is within cntena <br /> ND Non-detect - Result was below the DQO listed for the analyte <br />' DQO Data Quality Objective - This is the criteria against which the quality control data is compared <br /> I <br /> SP 406522 Quality Control Page 9 <br />