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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client. ARCO Products Companv Service Request: 59501567 <br /> Project. 1775-206 001 1 TO# 17075 00/ 548 Stockton Date Analyzed 12/14/05 <br /> Initial Calibration Verification(ICV) Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFF Method <br /> Units ppb <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Limits <br /> Benzene 25 22 5 90 85-115 <br /> Toluene 25 22 3 89 85-115 <br /> Ethvlbenzene 25 224 90 85-115 <br /> Xylenes Total 75 684 91 85-115 <br /> Gasoline 250 254 102 90-110 <br /> • <br /> i <br /> tCW25ALAM0194 <br /> Page 6 <br /> 4 <br />