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COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> Client ARCO ProdULN Companv Service Request. S970196I <br /> Project 20805-114 008/r0#20791 00/2130 STOCKTON Date Collected: NA <br /> Sample Matrix Air Date Received: NA <br /> Date Extracted: NA <br /> Date Analyzed. I0/I/97 <br /> Duplicate Summary <br /> BTEX and Total Volatile Hydrocarbons <br /> Sample Name 13ATCI i QC. Umts mg/m3 <br /> Lab Code 59701943-001 DUP Bass NA <br /> Test Notes <br /> Duplicate Relative <br /> Prep Analysis Sample Sample Percent Result <br /> Analyte Method Method MRL Result Result Average Difference Notes <br /> Benzene 5030 8020 0 4 58 6 4 6 0 10 <br /> Toluene 5030 8020 0 4 33 35 34 6 <br /> Ethylbenzene 5030 8020 05 13 14 14 7 <br /> Xylenes,Total 5030 8020 0 9 170 180 180 6 <br /> Total Volatile Hvdroe.arbom <br /> C1 -C5 5030 8015M 12 330 340 340 3 <br /> C6-C12 5030 8015M 20 1200 1300 1300 8 <br /> TPH as Gasohne* 5030 8015M 20 1200 1300 1300 8 <br /> pUP/020597p <br /> Page 10 <br />