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* COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> Client. EMCON Service Request 5950645 <br /> Project ARCO Facilitv No 548/EMCON Project No 1775-206 001 Date Collected* 5/12/95 <br /> Sample Matrix Water Date Received. 5/15/95 <br /> Date Extracted: NA <br /> Date Analyzed 5/22195 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units ug/L(ppb) <br /> Sample Name MW4 (63) <br /> Lab Code 5950622-004 <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 275 27 5 110 110 75-135 <1 <br /> Toluene 25 25 ND 266 26 5 106 106 73-136 <1 <br /> Ethylbenzene 25 25 ND 268 26 5 107 106 69-142 1 <br /> Approved By Date <br /> I]MS I S/060194 <br /> 0622 XLS w9tems 5126195 Pap No <br /> 1921 Ringwood Avenue • Son Jose California 95131 • Telephone 408/437-2400 Fox 408/437 9356 <br />