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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: EMCON Associates Date Received: 09/03/93 <br /> t• . Project: EMCON Project No. OG71-033.01 Service Request No.: SJ93-1102 <br /> ARCO Facility No. 548 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LOFT Method <br />• u9/L (ppb) <br /> Date Analyzed: 09/14/93 <br />• <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br />•# Benzene 25. 27.2 109. 85-115 <br /> Toluene 25. 27.0 108, 85-115 <br /> Ethylbenzene 25. 27.1 108, 85-115 <br /> Total Xylenes 75. 81 .8 109. 85-115 <br /> TPH as Gasoline 250. 248. 99. 90-110 <br />• <br /> I <br /> Approved by: Date: <br />• I 09ai..n..rn...i A..nn ... . C.... L.... r_C[-...:.. nc.1 0, <br />