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COLUMBIA ANALYTICAL SERVICES. INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 10/13/92 <br /> Project EMCON Project No OG71-018 01 Work Order No SJ92-1268 <br /> ARCO Facility No 2093 Sample Matrix Water <br /> Matrix Sp+ke/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> NgIL (ppb) <br /> Sample Name ATR-6 (261 <br /> Date Analyzed 10/16/92 <br /> Percent Recovery <br /> Spike CAS <br /> Spike Sample Result Acceptance <br /> Analyte Lml Resu3 MS DMS MS DMS Criteria <br /> Benzene 25 ND 26.7 267 107 107 39-150 <br /> Toluene 25. ND 264 26.4 106 106 46-148 <br /> Ethylbenzene 25. ND 263 26.2 105. 105 32-160 <br /> NO None Detected at or above the method reporting limit <br /> Approved by Date <br /> 10 <br /> 1921 Ringwood Avenue • Son Jose California 95131 • Telephone 408/437-2400 • Fox 408/437-9356 <br />