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I <br /> COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 04/07/93 <br /> I Project- EMCON Project No OG71-029 01 Service Request No SJ93-0472 <br /> ARCO Facility No 2130 Sample Matrix Water <br /> i <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> I Ng/L (ppb) <br /> Sample Name MW-1 (74) <br /> Date Analyzed 04/14/93 <br /> Percent Recovery <br /> i Spike CAS <br /> Spike Sample Result Acceptance <br /> Analyte Level Result ME DMS MS DMS Criteria <br /> Benzene 250 254 528 505 110 100 76-122 <br /> Toluene 250 64 5 364 350 120 114 75-127 <br />' Ethylbenzene 250 301 315 304 114 110 70-135 <br /> Approved by 1� � Date <br /> 8 <br />