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COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> • Client EMCON Service Request: S950645 <br /> Protect ARCO Facilitv No 2076/EMCON Project No 1775-220 001 Date Collected: 5/15/95 <br /> Sample Matrix Water Date Received- 5/18/95 <br /> Date Extracted: NA <br /> Date Analvzed• 5/22/95 <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 S950622-004 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Sample Spike Result Acceptance Percent <br /> Analvtc MS DMS Result MS DMS MS DMS Limits Difference <br /> Benzene 25 25 ND 275 27 5 110 110 75-135 <1 <br /> Toluene 25 25 ND 266 265 106 106 73-136 <1 <br /> Ethylbenzene 25 25 ND 268 265 107 106 69-142 1 <br /> JApproved By / Date <br /> DMS 1 5/060194 <br /> 0645 XLS wt3mms V26/95 Page No <br /> 1921 Ringwood Avenue • Son Jose Collforrno 95131 Telephone 408/437 2400 • Fox 408/437-9356 <br />