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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Senice Request: S9601538 <br /> Project: 2186 Stockton/421775-237.002/TO#19350,00 Date Analyzed: 10/1/96 <br /> Initial Calibration Verification(ICV) Summary <br /> BTEX, MTBE and TPH as Gasoline <br /> EPA Methods 503018020/California DHS LUFT Method <br /> Units: ppb <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analvte Value Result Recover} Limits <br /> Benzene 25 252 101 85-115 <br /> Toluene 25 24.9 100 85-115 <br /> £thvlbenzene 25 24.8 99 85-115 <br /> Xvlenes. Total 75 75.0 100 85-115 <br /> Gasoline 250 230 92 90-110 <br /> Methyl rerr-Butyl Ether 50 45 90 85-115 <br /> i <br /> ICV25A..*60194 <br /> Page 8 <br />