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COLUMBIA ANALYTICAL SERVICES,INC. <br /> Analytical Report <br /> Client ARCO Produi.t,,Company <br /> Service Request: 54700958 <br /> Project 21775-229 001'[O»21333 00/2130 STOCKTON Date Collected: 5/21197 <br /> Sample Matrt-t W Iter Date Received: S29A7 <br /> BTEX,MTBE and TPH as Gasoline <br /> I <br /> Sample Ndme MW-2(72) Units uglL(ppb) <br /> Lab Code 59700959-002 Basis MA <br /> Test Notes <br /> Prep Analvsis Dilution Date Date Result <br /> Analyte Method Method MRL Factor Extracted Analyzed Result Notes <br /> TPH as Gasoline EPA 5010 CA/LUFT 50 2 NA 6/2/97 720 <br /> Benzene CPA 5030 8020 05 2 NA 6/2197 71 <br /> Toluene EPA 5030 8020 05 2 NA 6/2197 <1 C1 <br /> Ethylbenzene EPA 5030 8020 05 2 NA 6/2/97 13 <br /> Xylenes,Total EPA 5030 8020 05 2 NA 6/2/97 1 1 <br /> Methyl lert-Butvl CUM EPA 5030 8020 3 2 NA 6/2/97 <6 C1 <br /> Cl the N4 LL«<I,elevdted due to thigh analyte concentration requiring sample dilution <br /> I <br /> IS221020397P <br /> Page 4 of 21 <br />