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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 LUFr Method <br /> ug/L (ppb) <br /> Sample Name W-2A (63) W-28LBM W-5 (69) <br /> Date Analyzed 02/18/92 02/14/92 02/14/92 <br /> Analyte MRL <br /> Benzene 0 5 17 ND <0 8' <br /> Toluene 0 5 3 7 NO ND <br /> Ethylbenzene 0 5 1 0 ND ND <br /> Total Xylenes 0 5 3 7 ND ND <br /> TPH as Gasoline 50 150 ND 60 <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 matrix interference <br /> • <br /> Approved by Aglu Date 2,4 / Z- <br /> 2 <br />