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rCOLUMBIA ANALYTICAL SERVICES,INC. <br /> Analytical Report <br /> Client: ENSR Consulting&Engmeerulg Service Request: 59701286 <br /> Project: Nareal/Stockton Seavengcr CoJ9647-1401 Date Collected. NA <br /> Sample Matrix. Water Date Received: NA <br /> BTEX,MTBE and TPH as Gasolme <br />' Sample Name Method Blank Units ug/L(ppb) <br /> Lab Code 5970710-WB1 Basis NA <br /> ITest Notes <br /> Prep Analysts Dilution Date Date Result <br />' Analyte Method Method MRL Factor Extracted Analyzed Result Notes <br /> TPH as Gasoline EPA 5030 CA/LUFT 50 1 NA 7/10/97 ND <br /> Benzene EPA 5030 8020 05 1 NA 7/10/97 ND <br /> Toluene EPA 5030 8020 05 1 NA 7110/97 ND <br /> Ethylbenzene EPA 5030 8020 05 I NA 7/10/97 ND <br /> Xylenes,Total EPA 5030 8020 05 1 NA 7/10/97 ND <br /> Methyl tent-Butyl Ether EPA 5030 8020 3 1 NA 7/10197 ND <br /> 1 <br /> 1 <br /> 1 <br /> IS21V"597p <br />' Page 7 <br />