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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: S9700959 <br /> Project: 21775-237.002!'['0!'121333.00/2196 STOCKTON Date Analyzed: 6/7197 <br /> Initial Calibration Verification(ICV) Summary <br /> BTEX,MTBE and TPH as Gasoline <br /> Sample Name: ICV <br /> Lab Code; IMUnits. ug/L(ppb)Test Notes: Basis; NA <br /> ICV Source: <br /> Prep Analysis True Percent Result <br /> Analyte Method Method Value Result Recovery Nates <br /> TPH as Gasoline EPA 5030 CA/LUFI' 250 240 96 <br /> Benzene EPA 5030 8020 25 26 104 <br /> Toluene EPA 5030 8020 25 25 100 <br /> Ethylbenzene EPA 5030 8020 25 26 104 <br /> Xylenes,Total EPA 5030 8020 75 80 107 <br /> Methyl Cert-Butyl Ether EPA 5030 8020 25 26 104 <br />�f <br /> °1 <br /> ICV/032196 <br /> Page 11 of I I <br />