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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: EMCON Associates Date Received:e ed• 09/03/93 <br /> Project: EMCON Project No. OG71-033.01 Service Request No.: SJ93-1102 <br /> ARCO Facility No. 548 Sample Matrix: Water <br />• <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> u9/L (ppb) <br />• <br /> Sample Name: MW-4 (631 <br /> _ <br /> Date Analyzed: 09/14/93 <br /> i <br />• <br /> Percent Recovery <br /> Spike CAS <br /> Spike Sample Result Acceptance <br />•' Analyte Level Result MS DMS MS DMS Criteria <br /> Benzene 25. ND 25.4 26.6 102. 106. 76-122 <br /> Toluene 25, ND 25.3 26.3 101 . 105. 75-127 <br /> Ethylbenzene 25, ND 24.9 25.8 100. 103. 70-135 <br />• <br />• <br /> d <br /> I <br /> Approved by: 4 In l, Date: <br />• <br /> 4074 D:.,.,..,.,�.a n..o,,.,„ . c.... r.,.., r..r:a_.,.:., na.�1 <br />