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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report "-- <br /> Client- EtiiC0N Associates Service Request: 5954269 <br /> Project- ARCO Facility No 2130 I EMCON Project No 1775-229 01 Date Collected: 2/28.311/95 <br /> Sample Matra: ater Date Received: 3/3/95 <br /> Date Extracted: NA <br /> Date Analvzed: 3/10/95 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units ug/L(ppb) <br /> Sampic Name MW-1 (73') <br /> Lab Code S950269-001 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Levet Sample Spike Result Acceptance Pet-cent <br /> lnatvte MS DMS Result MS DMS MS DMS Limits Difference <br /> Benzene 125 125 2 1 126 124 99 98 75-135 2 <br /> ToIuene 125 125 ND 122 128 98 102 73-136 5 <br /> Ethylbenzene 125 125 0 6 123 130 98 104 69-142 6 <br /> Approved By Date i <br /> DMSI SID60194 <br /> Page 7 <br />