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COLUMBIA ANALYTICAL SERVICES, INC - <br /> QA/QC Report , <br /> Client EMCON Service Request S950649 <br /> Project ARCO Facility No 434/EMCON Project No 1775-700 001 Date Collected 5118-19/95 <br /> Sample iVlatrir Water Date Received 5/22/95 <br /> Date Extracted. NA <br /> Date Analvzed 5/25/95 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units ug/L (ppb) <br /> Sample Name W-IA(77) <br /> Lab Code S950649-001 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Sample Spike Result Acceptance Percent <br /> Analyte MS DMS Result MS DMS MS DMS Linuts Difference <br /> Scnzene 25 25 ND 25 5 263 102 105 75-135 3 <br /> Toluene 25 25 ND 24 8 25 8 99 103 73-136 4 <br /> Ethylbcnzcne 25 25 ND 255 262 102 105 69-142 3 <br /> • <br /> Approved By Date <br /> DMS1 SM0194 <br /> r pias <br /> 0649 7RS wBlpna 6/N45 <br />