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1 <br /> COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> Client. ARCO Products Company Service Request: 59700930 <br /> Project 21775-234 002/TOl121333 0012168 STOCKTON Date Analyzed: 5129/97 <br /> huttal Calibration Verification(ICV)Summary <br /> BTEX,MTBE and TPH as Gasoline <br /> Sample Name ICV Umts ug/L(ppb) <br /> Lab Cade ICV 1 Basis NA <br /> Test Notes <br /> ICV Source <br /> Prep Analysis True Percent Result <br /> Analyte Method Method Value Result Recovery Notes <br /> TPH as Gasoline EPA 5030 CA/LUFT 250 230 92 <br /> Benzene EPA 5030 8020 25 24 96 <br /> Toluene EPA 5030 8020 25 24 96 <br /> Ethylbenzene EPA 5030 8020 25 24 96 <br /> Xylenes,Total EPA 5030 8020 75 74 99 <br /> Methyl lerl-Butyl Ether EPA 5030 8020 25 24 96 <br /> s <br /> Page 17 <br />