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i4 <br /> COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> • Client: ARCO Products Company Service Request: S9702474 <br /> Project: 20805-114 008/TO#20791 0012130 STOCKTON Date Collected: NA <br /> Sample Matra: Air Date Received: NA <br /> Date Extracted: NA <br /> Date Analyzed: 11/26/97 <br /> Duplicate Summary <br /> BTEX and Total Volatile Hydrocarbons <br /> Sample Name INMUENT Umts ppmV <br /> Lab Code S9702474-001 DUP Bag NA <br /> Test Notes <br /> Duplicate Relative <br /> Prep Analysa Sample Sample Percent Result <br /> Analyte Method Method MRL Result Result Average Difference Notes <br /> Benzene 5030 8020 01 ND ND NA — <br /> Toluene 5030 8020 01 37 43 40 7 <br /> Ethylbcnzene 5030 8020 01 12 12 12 <1 <br /> Xylenes,Total 5030 8020 02 74 74 74 <1 <br /> Total Volatile Hydrocarbons <br /> Cl-05 5030 9015M 5 6 5 6 10 <br /> C6-C12 5030 8015M 5 39 42 41 4 <br /> TPH as Gasoline' 5030 8015M 5 39 42 41 4 <br /> i <br /> Qurmo5970 <br /> Page 11 <br />