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I <br /> COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> iClient ARCO Prodw-ts Company Service Request- S9701961 <br /> Project 20805-114 008/TW20791 0012130 STOCKTON Date Collected: NA <br /> Sample Matrix. Air Date Received- NA <br /> Date Extracted: NA <br /> Date Analyzed 1011197 <br /> Duplicate Summary <br /> BTEX and Total Volatile Hydrocarbons <br /> Sample Name BATCH QC Units ppmV <br /> Lab Code S9701943-001 DUP Basis NA <br /> Test Notes <br /> Duplicate Relative <br /> Prep Analysis Sample Sample Percent Result <br /> Analvte Method Method MRL Result Result Average Difference Notes <br /> Benzene 5030 8020 01 1 8 2 0 1 8 10 <br /> Toluene 5030 8020 01 8 8 93 91 6 <br /> Ethylbenzene 5030 8020 0 1 3 0 32 3 2 7 <br /> Xylenes Total 5030 8020 0 2 39 42 41 6 <br /> Total Volatile Hydrocarbons <br /> . Cl-05 5030 8015M 5 140 140 140 3 <br /> C6-C12 5030 8015M 5 290 320 310 8 <br /> TPH as Gasoline* 5030 8015M 5 290 320 310 8 <br /> I <br /> t)Upl020597p <br /> Page 11 <br />