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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> . Client ARCO Products Compairy Service Request: S9700501 <br /> Pi oleLt 2168 STOCKTON/2()805-146 0IU/TO#20682 00 Date Collected. 3/20/97 <br /> Sample Mattix Air Date Received 3/21/97 <br /> Date Extracted. N/A <br /> Date Analyzed: 3/2I/97 <br /> Duplicate Summary <br /> BTEX .i ad Total Volatile Hydrocarbons <br /> Units uL/L (ppmv) <br /> Sample Name INFLUENT <br /> Lab Code S'9700501-001 <br /> Duplicate Relative <br /> Sample Sample Percent <br /> Analyte MRL Result Result Average Difference <br /> Benzene 0 2 60 50 55 18 <br /> Toluene 01 250 230 240 8 <br /> Ethylbenzene 01 28 25 27 11 <br /> Xylenes Total 0 2 180 160 170 12 <br /> Total Volatile H�drocarbons <br /> Cl. - C5 5 1900 1300 1,600 38 <br /> C6- C12 5 3,400 3,400 3,400 <1 <br /> TPH as Gasoline's 5 3,400 3,400 3,400 <1 <br /> Methvi leit-Butt l Ether 0 8 28 2I 25 28 <br /> Note ppmV= ing/m' \ 124 45 (gas constant)/ molecular weight(MW)] <br /> MW Benzene= 78 Toluene= 92 Ethvlbenzene= 106, Total Xvlenes= 106 <br /> MW Gasoline= 100 <br /> * TPH as gasoline is defined as C6 (benzene) through C12 (dodecane)and uses a <br /> molecular i%cight of IM) to calculate the ppmv <br /> nUPIY060194 <br /> Page 8 <br />