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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/OC Report <br /> Client EMCON Associates Date Received 06111/93 <br /> Project EMCON Project No OG71-038 01 Service Request No SJ93-0776 <br /> ARCO Facility No 2168 Sample Matrix Water <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> u9/L (ppb) <br /> Date Analyzed 06/17/93 <br /> Percent Recovery <br /> Spike CAS <br /> Spike Sample Result Acceptance <br /> Analyte Level Result MS DMS MS DMS Criteria <br /> Benzene 25 ND 23 3 23 7 93 95 76-122 <br /> Toluene 25 ND 24 2 24 7 97 99 75-127 <br /> Ethylbenzene 25 ND 230 22 7 92 91 70-135 <br /> s <br /> Approved by JAA Date <br /> 12 <br />