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COLUMBIA ANALYTICAL SERVICES,INC <br /> Analytical Report <br /> . Client. ARCO Products Company Service Request: S9700930 <br /> Protect 21775-234 002/T0#21333 0012168 STOCKTON Date Collected: 5119197 <br /> Sample Matrix Water Date Received: 5120197 <br /> BTEX,MTBE and TPH as Gasoline <br /> Sample Name MW-5(55) Units ug/L(ppb) <br /> Lab Code S9700930-005 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/L.UFT 50 100 NA 5/30/97 43000 <br /> Benzene EPA 5030 8020 05 100 NA 5130/97 5500 <br /> Toluene EPA 5030 8020 0 5 100 NA 5/30/97 4300 <br /> Ethylbenzene EPA 5030 8020 05 100 NA 5/30/97 660 <br /> Xylenes Total EPA 5030 8020 05 100 NA 5/30/97 3800 <br /> Methyl Cert-Butyl Ether EPA 5030 8020 3 100 NA 5/30/97 <300 Cl <br /> C 1 The MRL was elevated due to high analyte concentration requiring sample dilution <br /> 1S221020597p <br /> Page 8 <br />