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COLUMBIA ANALYTICAL SERVICES, INC. <br /> 1 Analytical Report <br /> Client EMCON Associates Date Received 05/14/92 <br /> Project EMCON Project No G71-17 01 Work Order # SJ92-0606 <br /> Arco Facility No 434 Sample Matrix Water <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> pg/L (ppb) <br /> Sample Name W-1A (771 W-2A 6 W-2B <br /> Date Analyzed 05/21/92 05/21/92 05/21/92 <br /> Analyte MRL <br /> Benzene 0 5 5 6 ND ND <br /> Toluene 0 5 ND ND ND <br /> Ethylbenzene 05 NO ND ND <br /> Total Xylenes 0 5 NO NO ND <br /> TPH as Gasoline 50 220 ND ND <br /> TPH Total Petroleum Hydrocarbons <br /> MRL Method Reporting Limit <br /> ND None Detected at or above the method reporting limit <br /> Approved by <br /> c ,( Date <br /> 2 <br /> 10'14 R --wnnrl Avon,ia • Snn Cnitforrio 95134 • TPlPohone 4081437 2400 • Fox 4081437 9356 f <br />