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�- IWO, <br /> May 10, 2004 Lab ID : STK432422 <br /> Clark Well Inc. Customer : 3-2343 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units Cone. QC Data DQO Note <br /> DBCP 504.1 04/18/2004:A203 Blank ug/L ND <0.01 <br /> LCS ug/L 0.2950 77.0% 70-130 <br /> BS ug/L 0.2950 77.8% 70-130 <br /> BSD ug/L 0.2950 78.4% 70-130 <br /> BSRPD ug/L 0.8% 530 <br /> 504.1 04/18/2004:A 00-CCV ug/L 5.000 78.0% 70-130 <br /> 01-CCV ug/L 5.000 78.4% 70-130 <br /> 1.3-Dibromopropane-Surrogme 504.1 04/18/2004:A203 Blank ug/L 0.5882 98.3% 70-130 <br /> LCS ug/L 0.5882 96.0% 70-130 <br /> BS ug/L 0.5882 95.4% 70-130 <br /> BSD ug/L 0.5882 96.2% 70-130 <br /> 504.1 04/18/2004:A 00-CCV ug/L 10.00 96.2% 70-130 <br /> 101-CCV ug/L 10.00 96.7% 70430 <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 /> MS/MSD 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 /> BS/BSD Blank Spikes - A blank is spiked with a known atnount of analyte. It is prepared to verify that the preparation <br /> process is not affecting analyte recovery. <br /> CCB Continuing Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <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 Objective - This is the criteria against which the quality control data is compared. <br /> STK432422: Quality Control Page 2 <br />