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ti <br /> COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Requests S9702474 <br /> Project: 20805-114 0081TO#20791 0012130 STOCKTON Date Collected: NA <br /> Sample Matra: Au Date Received: NA <br /> Date Extracted: NA <br /> Date Analyzed: 11126!97 <br /> Dupheate Summary <br /> BTEX and Total Volatile Hydrocarbons <br /> Sample Name INFLUENT Unna, mglm3 <br /> Lab Code S9702474-OOI DUP Halm, 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 04 ND ND NA — <br /> Toluene 5030 8020 04 140 160 150 13 <br /> Etttylbenwne 5030 8020 05 53 53 53 Q <br /> Xylenes,Total 5030 $020 09 320 320 320 Q <br /> Total Volatile Hydrocarbons <br /> Cl -05 5030 8015M 12 is 13 14 7 <br /> C6-C12 5030 8015M 20 1600 1700 1700 6 <br /> TPH as Gasoline' 5030 8015M 20 1600 1700 1700 6 <br /> 10 <br /> i tPmm" <br /> I <br /> Page 10 <br />