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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> ARCO Products Company Service Request: 59600993 <br /> P ct: 2130 Stockton/#20805-114 006/TO#18957 00 Date Collected: 6/18/96 <br /> Sample Matrix: Air Date Received. 6119/96 <br /> Date Extracted: NA <br /> Date Analyzed: 6/20/96 <br /> Duplicate Summary <br /> BTEX and Total Volatile Hydrocarbons <br /> Units mg/m3 <br /> Sample Name Influent <br /> Lab Code S960993-001 <br /> Duplicate Relative <br /> Sample Sample Percent <br /> Analyte MRL Result Result Average Difference <br /> Benzene 0 5 3 3 3 7 4 11 <br /> Toluene 05 150 150 150 <1 <br /> Ethylbenzene 0 5 40 41 41 2 <br /> Xylenes,Total 1 290 290 290 <1 <br /> I Volatile Hydrocarbons <br /> 1 -C5 10 190 190 190 <1 <br /> C6-C12 20 2,100 2,100 2,100 <1 <br /> TPH as Gasohne* 20 2,100 2,100 2,100 <1 <br /> i <br /> i <br /> i <br /> I <br /> I <br /> Note ppmV=mg/m; x [24 45 (gas constant)/molecular weight(MVV ] <br /> MW Benzene=78,Toluene=92,Ethylbenzene= 106,Total Xylenes= 106 <br /> MW Gasoline= 100 <br /> * TPH as gasoline is defined as C6(benzene)through C12 (dodecane)and uses a <br /> molecular weight of 100 to calculate the ppmv <br /> DUPISM60194 Page 7 <br />