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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: 59700685 <br /> Protect: 20805-146 010/TO#20682 00/2168 STOCKTON Date Collected: 4/16/97 <br /> Sample Matrix: Air Date Received: 4/17/97 <br /> Date Extracted: N/A <br /> Date Analyzed: 4/17/97 <br /> Duplicate Summary <br /> BTEX and Total Volatile Hydrocarbons <br /> Units uL/L(ppmv) <br /> Sample Name Influent <br /> Lab Code 59700685-0OID <br /> Duplicate Relative <br /> Sample Sample Percent <br /> Analyte MRL Result Result Average Difference <br /> Benzene 01 16 18 17 12 <br /> Toluene 01 230 270 250 16 <br /> Ethylbenzene 01 46 55 51 18 <br /> Xylenes, Total 0 2 300 390 340 26 <br /> r� Total Volatile Hydrocarbons <br /> C1 -C5 5 340 370 360 8 <br /> C6-C12 5 2700 3400 3000 23 <br /> TPH as Gasoline* 5 2700 3400 3000 23 <br /> Methyl ter(-Butyl Ether 0 8 <20 Cl <20 CI -- -- <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 /> DUPI SM60194 <br /> Page 8 <br />