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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client- ARCO Products Companv Service Request: 5951356 <br /> Protect. 1775-706 001 /TO# 17075 00 /2093 Tracy Date Collected: 10/26 27195 <br /> Sample Matrix Nater Date Received: 10/31/95 <br /> Date Extracted: NA <br /> Date Analyzed. 11/1,2/95 <br /> Matrix Spike/Duplicate Matrix Spike Sununary <br /> BTE <br /> EPA Methods 5030/8020 <br /> Units uglL (ppb) <br /> Sample Name A4634 ATR7 pp <br /> Lab Code S9513564)09 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Simple Spike Result -acceptance Percent <br /> anaivte MS DMS Result MS DMS NIS DMS Linuts Difference <br /> Benzene 1000 1000 'SID 948 977 95 98 75-135 3 <br /> Toluene 1000 1000 ND 991 979 99 98 73-136 1 <br /> Ethvlbenzene 1000 1000 -ID 967 1,000 97 100 69-142 3 <br /> DMS1&MWi94 <br /> Page 7 <br />