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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: S9601539 <br /> Project. 2130 Stockton/#21775-229 002/TO#19350 00 Date Collected: 9118196 <br /> Sample Matrix. Water Date Received: 9120196 <br /> Date Extracted: NA <br /> Date Analyzed: 9130196 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units ug/L(ppb) <br /> Sample Name MW-3 (73) <br /> Lab Cade S9601539-003 <br /> Percent Recovery <br /> CAS Relatif e <br /> Spike Level Sample Spike Result Acceptance Percent <br /> Analyte MS DMS Result MS DMS MS DMS Limits Difference <br /> Benzene 25 25 ND 26 8 25 8 107 103 75-135 4 <br /> Toluene 25 25 ND 26 2 25 1 105 t00 73-136 4 <br /> Ethylbenzene 25 25 ND 26 0 24 9 104 100 69-142 4 <br /> DMSISMWI94 <br /> Page 9 <br />