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COLUMBIA ANALYTICAL SERVICES.INC. <br /> QA/QC Report <br /> Client: ARCO Products Companv Servu.e Request- S9501673 <br /> Project 0805-114 004/TO#2130-95-5 Date Collected 12/21/95 <br /> Sampie Matrix Vapor Date Received: 12/22/95 <br /> Date Extracted NA <br /> Date Analvzed• 12/22/95 <br /> Duplicate Summary <br /> BTEX and Total Volatile Hvdrocarbons <br /> Units mg/m3 <br /> Sample Name Influent <br /> Lab Code S9501673-001 <br /> Duplicate Relative <br /> Sample Sample Percent <br /> Analyte MRL Result Result Average Difference <br /> Benzene 0 5 <1 * <1 * <1 NA <br /> Toluene 05 7 8 8 13 <br /> Ethvlbenzene 05 2 2 2 <1 <br /> Xylenes Total 1 23 24 24 4 <br /> Total Volatile Hydrocarbons <br /> C1 -C4 HNdrocarbons 20 <40 * <40 * <40 NA <br /> Ci -CH Hvdrocarbons 20 1,300 1.300 1 300 <1 <br /> C9 -Cie HNdrocarbons 20 100 100 100 <1 <br /> Gasoline Fraction(C.-C12) 60 1,400 l_400 1 400 <1 <br /> * Raised MRI-due to high analyte concentration requiring sample dilution <br /> DUPIS/000194 <br /> Page 6 <br />