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April 28, 2004 Lab ID STK432106 <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 /> Definitions <br /> Blank Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples <br /> LCS Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte <br /> recovery <br /> MSIMSD Matrix Spikes - A random sample is spiked with a known amount of analyte The recoveries are an indication o <br /> how that sample matrix affects analyte recovery <br /> BSBSD 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 criteria <br /> ND Non-detect - Result was below the DQO listed for the analyte <br /> DQO Data Quality Oblecnve - This is the criteria against which the quality control data is compared <br /> I <br /> i <br /> • <br /> STK432106 Quality Control Page 4 <br />