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COLUMBIA ANALYTICAL SERVICES,INC <br /> Analytical Report <br /> . Client ARCO Products Company Service Request: 59700930 <br /> Project 21775-234 002/TO92t333 00/2168 STOCKTON Date Collected: 5/19197 <br /> Sample Matrix Water Date Received: V20/'97 <br /> BTEX,MTBE and TPH as Gasoline <br /> Sample Name MW-6(4 t) Units ug/L(ppb) <br /> Lab Code S9700930-006 Basis NA <br /> Test Notes <br /> Prep Analysis Dilution Date Date Result <br /> Analyte Method Method MRL Factor Extracted Analyzed Result Notes <br /> TPH as Gasoline EPA 5030 CA/LUFr 50 200 NA 5/30/97 69000 <br /> Benzene EPA 5030 8020 0 5 200 NA 5/30/97 7900 <br /> Toluene EPA 5030 8020 0 5 200 NA 5130/97 5000 <br /> Ethylbenzene EPA 5030 8020 05 200 NA 5/30/97 1200 <br /> Xylenes,Total EPA 5030 8020 0 5 200 NA 5/30/97 7700 <br /> Methyl tent-Butyl Ether EPA 5030 8020 3 200 NA 5/30/97 <600 Cl. <br /> C I The MRL was elevated due to high analyte concentration requtrmg sample dilution <br /> IS22/020597P <br /> Page 9 <br />