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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client ARCO Products Companv Service Request. S951074 <br /> Project 1775-229 001 /T04 17075 00 /2130 Stockton Date Analvzed 9/7/95 <br /> Imnal Calibration Verification(ICV)Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Units ppb <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analvte Value Result Recovery Limits <br /> Benzene 25 246 98 85-115 <br /> Toluene 25 243 97 85-115 <br /> Ethvibenzene 25 24 1 96 85-115 <br /> Xylenes Total 75 73 1 97 85-115 <br /> Gasoline 250 254 102 90-110 <br /> IC V25AU060194 <br /> Page 6 <br />