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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> • Client ARCO IliodLICNConthan� Service Re(IUL%t 59700532 <br /> ProleLt 2177 -2()600irr()fli935o00/548STOC.KI70N Date Analwed. 3/28/97 <br /> hutial Calibration Verification(ICV) Summary <br /> BTEX MTBE and TPH as Gasoline <br /> Sample Natne ICV Units ug/L(ppb) <br /> Lab Code ICV 1 Basis NA <br /> Test Notes <br /> ICV Source <br /> AnhlVti11, True Percent Result <br /> Analyte Mt thad Value Result Recovery Notes <br /> TPH as Crdsoltne C A/WrT 250 250 100 <br /> Benzene X020 25 24 96 <br /> Toluene 8020 25 25 100 <br /> Ethylbenzetie 8020 25 25 100 <br /> Xylenes,Total 802.0 75 74 99 <br /> Methyl tert-Butyl Ether 8020 25 25 100 <br /> • <br /> ICV10'42396 <br /> 97005'42\LS IC% Page 13 Page No <br />