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COLUMBIA ANALYTICAL SERVICES,INC. <br /> Analytical Report <br /> Client ARCO Prodm tt Companv Service Request; 59700958 <br /> ProleLt 21775-229 003f10,721333 00/2130 STOCKTON Date Collected: 5I2m <br /> Samp1L Matriā™¦ Water Date Received: 52vn <br /> BTEX,MTBE and TPH as Gasoline <br /> Sample Mime MW-6(72) Units ug(L(Ppb) <br /> Lab Code 59700958-006 Bads NA a <br /> Test Notes <br /> Prep Analysis Dilution Date Date Result <br /> Analyte Method Method MRI. Factor Extracted Analyzed Result Notes <br /> TPH as Gasoline EPA)03o CA/LUFT 50 I NA 5/31/97 180 <br /> Benzene EPA 5030 8020 05 l NA 5/31/97 <2 Ml <br /> Toluene EPA 5030 8020 05 1 NA 5/31/97 ND <br /> Ethylbenzene EPA 5030 8020 05 1 NA 5/31/97 ND <br /> Xylenes Total EPA 5030 8020 05 1 NA 5/31/97 ND <br /> Methyl tert-Butvl Ether EPA 5030 8020 3 1 NA 5/31/97 ND <br /> M1 T lie N RL+vas elevated because of matrix interferences <br /> vuvo20597y <br /> Page 8 of 21 <br />