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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: 59600832 <br /> Project: 2186 Stockton/#21775-237.002/TO#19350.00 Date Analyzed: 5/31/96 <br /> Initial 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 24.9 100 85-115 <br /> Toluene 25 25.I 100 85-115 <br /> Ethylbenzene 25 25.3 101 85-115 <br /> Xylencs, Total 75 76.4 102 85-115 <br /> Methyl tort-Butyl Ether 50 49 98 85-115 <br /> Gasoline 250 245 98 90-110 <br /> ICV25A-U050194 <br /> Page 8 <br />