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March 31, 2004 Lab ID STK431885 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Explanations <br /> 360 CCV above Acceptance Range (AR) Samples which were non detect for this analyte were accepted <br /> 410 Relative Percent Difference (RPD) not within Maximum Allowable Value (MAV) Data was accepted <br /> based on the LCS or CCV recover-, <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 verif% that the preparation process is not contributing contammanon to the samples <br /> BS/BSD Blank Spikes - A blank is spiked wuli a known amount of analyte It is prepared to verify that the preparation <br /> process is not affecting analvte 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 - 'Phis is the cntena against which the quality control data is compared <br /> t <br /> 1 <br /> STK431885 Quality Control Page 9 <br />