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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: ARCO Service Request: 59600288 <br /> Project: 2186 Stock--n /#21775-237.002 1 TO##19350.00 Date Collected: 2/16/96 <br /> Sample Matrix: Water Date Received: 2/20106 <br /> Date Extracted: NA <br /> Date Analvzed: 2126196 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units: ug/L (ppb) <br /> Sample Namc: MW-2 (741 <br /> Lab Code: S9600288-f 21 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Saimple Spilcc Result Acceptance Percent <br /> Analyte MS DMS Result MS DMS MS DMS Limits Difference <br /> Benzene 25 25 ND 23.5 23.9 94 96 75-135 2 <br /> Toluene 25 25 ND 23.5 24 94 96 73-136 2 <br /> Ethylbenzcnc 25 25 ND 23.9 24.1 96 96 69-142 l <br /> DWI 5/060144 <br /> Page 6 <br />