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COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report - <br /> Client E~MCON Assoc arcs Service Request: S950t92 <br /> Project ARCO Facilit% 10 760fEMCON Project No 1775-212 01 Date Collected- 2/13/95 <br /> Sample Matrix Water Date Received 2/16/95 <br /> Date Extracted: NA <br /> Date Analyzed. 2/22, 23/95 <br /> Matri\ Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units ug/L(ppb) <br /> Sainple Namc Batch QC <br /> Lab Code S950211-001 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Leel Sample Spike Result Acceptance Percent <br /> �nalrte %IS DMS Result MS DMS MS DMS Limits Difference <br /> Ben/cnc 25 25 ND 263 25 6 105 102 75-135 3 <br /> Toluene 25 25 ND 25 1 246 100 98 73-136 2 <br /> Ethvlbcnrcne 25 25 ND 25 6 24 9 102 100 69-142 3 <br /> ,\pproN ed B� CX-�..•� de. irDate 3 <br /> 1115/5 OGOIgI <br /> Page 7 <br />