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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 11/19/92 <br /> Project EMCON Project No OG71-017 01 Work Order No SJ92-1466 <br /> ARCO Facility No 434 Sample Matrix Water <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> jig/L (ppb) <br /> Sample Name W-3 (68) <br /> Date Analyzed 11/25/92 <br /> Percent Recovery <br /> aSpike CAS <br /> Spike Sample Result Acceptance <br /> Analyte Level Result MS DMS MS DMS Criteria <br /> Benzene 250 5 2 255 248 100 97 39-150 <br /> Toluene 250 0 8 249 243 100 97 46-148 <br /> Ethylbenzene 250 ND 246 240 98 96 32-160 <br /> ND None Detected at or above the method reporting limit <br /> Approved by _�flu Date " 44`%�- <br /> 10 <br />