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• COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> . Client: EMCON Associates Date Received: 06/09/93 <br /> Project: EMCON Project No. OG71-033.01 <br /> Service Request No.: SJ93-0761 <br /> ARCO Facility No. 548 Sample Matrix: Water <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> u91L Ippb) <br /> i <br /> I <br /> Sample Name: MW-2 <br /> Date Analyzed: 06/15/93 <br /> Percent Recovery <br /> • Spike CAS <br /> Spike Sample Result Acceptance <br /> Analyte Level Result MS DMS MS DMS Criteria <br /> Benzene 25. ND 26.7 29.0 107. 116. 76-122 <br /> Toluene 25. NO 27.4 29.2 110. 117. 75-127 <br /> Ethylbenzene 25. ND 26.3 28.1 105, 112, 70-135 <br /> i <br /> i <br /> �� <br />� Approved by: Date: <br /> � n <br />