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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 08/20/93 <br /> Project EMCON Project No OG71-051-01 Service Request No SJ93-1041 <br /> ARCO Facility No 6020 Sample Matrix Water <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> ,rg/L (ppb? <br /> Sample Name MW-1 (39) <br /> Date Analyzed 08/27/93 <br /> Percent Recovery <br /> Spike CAS <br /> Spike Sample Result Acceptance <br /> Analyte Level Result M5 DMS MS DMS Criteria <br /> Benzene 25 ND 24 9 23 8 100 95 76-122 <br /> Toluene 25 NO 257 24 6 103 98 75-127 <br /> Ethylbenzene 25 ND 24 1 22 8 96 91 70-135 <br /> Approved by Date Z <br /> 1921 Ringwood Avenue • Son Jose Coliforrno 95131 • Telephone 4081437 2400 Fox 408/437 9356 <br />