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COLUMBIA ANALYTICAL SERVICES,INC. <br /> Analytical Report <br /> Client: EMCON Service Request: S9803673 <br /> Project: USA Station No.55,Lodi,CA/20A41-008.001 Date Collected: 12/29/98 <br /> Sample Matrix: water Date Received: 12/30/98 <br /> BTEX,MTBE and TPH as Gasoline <br /> Sample Name; Mw-4 <br /> Units: ug/L(ppb) <br /> Lab Code: 59803673-003 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/LUFT 50 50 NA 112/99 32000 <br /> Benzene EPA 5030 8020 0.5 50 NA 1/2/99 92 <br /> Toluene EPA 5030 8020 0.5 50 NA 112199 40 <br /> Ethylbenzene EPA 5030 8020 0.5 50 NA 1/2/99 1000 <br /> Xylenes,Total EPA 5030 8020 0.5 50 NA 1/2/99 5700 <br /> We thyl ler/-Butyl Ether EPA 5030 8020 3 50 NA 112199 <150 Cl <br /> Cl. The MRL was elevated due to high analyte concentration requiring sample dilution. <br /> • <br /> 1 S22MO59V <br /> Page 5 <br />