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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client- EMCON ServEce Request- 59600244 <br /> Project 2130 STOCKTON 21775-229 002/I'O##19350 00 Date Collected 2/5/96 <br /> Sample Matrix Water Date Received 2/8/96 <br /> Date Extracted NA <br /> Date Analyzed. 2/12/96 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units ug/L (ppb) <br /> Sample Name Batch QC <br /> Lab Code 59600244 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Sample Spike Result Acceptance Percent <br /> Analyte MS DMS Result MS DMS MS DMS Limits Difference <br /> Benzene 25 25 ND 250 25 3 100 101 75-135 1 <br /> Toluene 25 25 ND 25 1 25 4 100 102 73-136 1 <br /> EthyIbenzene 25 25 ND 250 255 100 102 69-142 1 <br /> DMSIS/060194 <br /> Page 6 <br />