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COLUMBIA ANALYTICAL SERVICES, INC <br /> Client EMCON Associates Date Received 08/20/92 <br /> Project EMCON Project No G71-17 01 Work Order # SJ92-1049 <br /> Arco Facility No 434 Sample Matrix Water <br /> QA/OC Report <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> ug/L {ppb) <br /> Sample Name W.6 (68) <br /> Date Analyzed 08/25/92 <br /> Percent Recovery <br /> Sample Spike Result Acceptance <br /> Analytes Spike Level Result MS DMS MS DMS Criteria <br /> Benzene 25 ND 255 296 102 118 39-150 <br /> Toluene 25 ND 257 305 103 122 46-148 <br /> Ethylbenzene 25 ND 248 305 99 122 32-160 <br /> ND None Detected at or above the method reporting limit <br /> L <br /> Approved by /[�� &LM411:� Date <br /> 10 <br /> 1921 Ringwood Avenue • 5an Jose California 95131 • Telephone 408/437 2400 Fox 408/437 9356 <br />