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COLUMBIA ANALYTICAL SERVICES, INC <br /> Analytical Report <br /> Client EMCON Associates Date Received 02/13/92 <br /> Project EMCON Project No G71-17 01 Work Order # SJ92-0154 <br /> Arco Facility No 434 Sample Matrix Water <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> ug/L (ppb) <br /> Sample Name W-12 (771 W-11 1791 W-1A 77 <br /> Date Analyzed 02/18/92 02/14/92 02/14/92 <br /> Analyte. MRL <br /> Benzene 0 5 12 NO 18 <br /> Toluene 0 5 NO NO <1 ` <br /> Ethylbenzene 0 5 NO NO <1 ` <br /> Total Xylenes 0 5 NO NO <1 ` <br /> TPH as Gasoline 50 95 340 430 <br /> TPH Total Petroleum Hydrocarbons <br /> MRL Method Reporting Limit <br /> ND None Detected at or above the method reporting limit <br /> • Raised MRL due to high analyte concentration requiring sample dilution <br /> • <br /> Approved by Date <br /> 4 <br />