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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> iClient. ARCO Products Company Service Request: 5951093 <br /> Protect. 1775-206 001/TO# 17075 001548 Stockton Date Collected: 8/29/95 <br /> Sample Matnx Vater Date Received: 8/31/95 <br /> Date Extracted: NA <br /> Date Analyzed: 917,$/95 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units ug/L(ppb) <br /> Sample Name MW-5 (60) <br /> Lab Code S951093-005 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Sample Spike Result Acceptance Percent <br /> Analvte MS DMS Result MS DMS MS DMS Limits Difference <br /> Benzene 500 500 410 860 870 90 92 75-135 l <br /> Toluene 500 500 150 600 620 90 94 73-136 3 <br /> Ethylbenzene 500 500 310 750 760 88 90 69-142 1 <br /> DMS1S/M[94 <br /> Page 7 <br />