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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> iClient: ARCO Products Company Service Request: 59700685 <br /> Protect: 20805-146 010/TO##20682 06/2168 STOCKTON Date Collected: NA <br /> LCS Matrix Air Date Received: NA <br /> Date Extracted: NA <br /> Date Analyzed: 4/17/97 <br /> Laboratory Control Sample Summary <br /> BTEX and Total Volatile Hydrocarbons <br /> Units mg/m3 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Limits <br /> Gasoline 200 200 100 60-140 <br /> i <br /> tcswt2isva <br /> Page 9 <br />