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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: S9700685 <br /> Project: 20805-146 010frO#20682 00/2168 STOCKTON Date Collected: 4/16/97 <br /> Sample Matrix- Air Date Received: 4117/97 <br /> Date Extracted: N/A <br /> Date Analyzed: 4117197 <br /> Duplicate Summary <br /> BTEX and Total Volatile Hydrocarbons <br /> Units mg/m3 <br /> Sample Name Influent <br /> Lab Code S9700685-OOID <br /> Duplicate Relative <br /> Sample Sample Percent <br /> Analyte MRL Result Result Average Difference <br /> Benzene 0 4 50 57 54 13 <br /> Toluene 0 4 880 1000 940 13 <br /> Ethylbenzene 0 5 200 240 220 18 <br /> Xylenes,Total 0 9 1300 1700 1500 27 <br /> Total Volatile Hydrocarbons <br /> C1 -05 12 800 880 840 10 <br /> C6 -C12 20 11000 14000 12000 24 <br /> TPH as Gasoline* 20 11000 14000 12000 24 <br /> Methyl ter(-Butyl Ether 3 <60 Cl <60 Cl -- -- <br /> Note ppmV=mg/m3 x [24 45 (gas constant)/molecular weight(MW)] <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 /> C1 The MRL was elevated due to high analyte concentration requiring sample dilution <br /> DUPE Sl060]94 <br /> Page 7 <br />