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.I <br /> COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> i Client EMCON <br /> Service Request: L9702274 <br /> ProleLt 2]'30 STOCKTON/#20805-1 14 008/TO#20791 00 Date Colleted NA <br /> Sample Matux �,apor Date Received NA <br /> Date Extracted NA <br /> Date Analyzed 712197 <br /> Duplicate Summary <br /> BTEX and Total Volatile Hvdrocarbons <br /> EPA Methods 8020/Modified 8015 <br /> Units uL/L(ppmv) <br /> Sample Name INFLUENT <br /> Lab Code L9702274-001 <br /> Duplu,ate Relative <br /> Sample Sample Percent <br /> Analyte MRL Result Result Average Difference <br /> Benzene 0 1 036 036 036 <1 <br /> Toluene 0 I 46 7 452 460 3 <br /> Ethylbenzene ill 13 9 13 4 13 7 4 <br /> Total Xylenes 0 2 155 148 152 5 <br /> Total Volatile H�drocarbon <br /> C1-05 5 **<50 **<50 **<50 NA <br /> C6-C12* 5 957 961 959 <1 <br /> * TPH as gasoline is defined as C6 (Benzene)through Cl2 (Dodecane) <br /> ** 10RL is c1m aced because of matrix interferences and because the sample required diluting <br /> UUP I S11205v4 <br /> Page 8 <br /> r <br />