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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> t• ARCO Products Company Service Request: 59600993 <br /> P ect• 2130 Stockton/#20805-114 0061TO#18957 00 Date Collected. 6118196 <br /> LCS Matrix Vapor Date Received 6119196 <br /> Date Extracted: NA <br /> Date Analyzed: 6120196 <br /> Laboratory Control Sample Summary <br /> BTEX and Total Volatile Hydrocarbons <br /> EPA Methods 5030/8020/Modified 8015 <br /> Units mg/M3 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Anal%lc Value Result Recovery Limits <br /> Benzene 24 260 108 60-140 <br /> Toluene 24 25 3 105 60-140 <br /> Ethylbenzene 24 243 101 60-140 <br /> i <br /> M <br /> LCSl121594 Page 9 <br />