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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> • Client: ARCO Products Company Service Request: 59602045 <br /> Project: 2186 STOCKTON121775-237.002/rO#19350.00 Date Analyzed: 12/6/96 <br /> Initial Calibration Verification(ICV) Summary <br /> BTEX. MTBE 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 25.4 102 85-115 <br /> Toluene 25 24.9 l00 85-115 <br /> Ethvlbcnzene 25 26.6 106 85-115 <br /> Xylenes. Total 75 75.1 100 85-115 <br /> Gasoline 250 235 94 90-110 <br /> Methyl rerr-Butvi Ether 25 23 92 85-115 <br /> • <br /> • <br /> 1CV25AU060194 <br /> Page 8 <br />