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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 08/20/93 <br /> I Project EMCON Project No OG71-050 01 Service Request No SJ93-1035 <br /> ARCO Facility No 2076 Sample Matrix Water <br /> I <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTe <br /> EPA Methods 503018020 <br /> 1 gg/L (ppb) <br /> Date Analyzed 08/26/93 <br /> 1 <br /> Percent Recovery <br /> Spike CAS <br /> Spike Sample Result Acceptance <br /> 1• <br /> Analyte Level Result MS DMS MS DMS Criteria <br /> Benzene 25 ND 234 23 0 94 92 76-122 <br /> Toluene 25 ND 244 24 1 98 96 75-127 <br /> Ethylbenzene 25 ND 23 9 24 0 96 96 70-135 <br /> r <br /> r <br /> R <br /> Approved by Date <br /> 7 <br />