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COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> Client ARCO Products Companv Serv[Le Request 59600163 <br /> Project 2110 Stockton 1 0805-114 004 /TO#18957 00 Date. Collected 1/24196 <br /> Sample Mati ix Vapor Date Received 1/25/96 <br /> Date Extracted NA <br /> Date Analyzed, 1/26/96 <br /> Duplicate Summary <br /> BTEX snd Total Volatile Hydrocarbons <br /> Units mg/m3 <br /> Sample Name Batch QC <br /> Lab Code S9600165-0u 1 <br /> Duplicate Relative <br /> Sample Sample Percent <br /> Anahte MRL Result Result Average Difference <br /> Benzene 05 3 5 3 5 4 <1 <br /> Toluene tt 5 7 1 7 5 7 5 <br /> Ethvlbcnzene 0 5 1 0 10 1 0 <1 <br /> Xylenes Total 1 16 17 17 6 <br /> Total Volatile H%drocarbons <br /> C1 -C, H%drocarbons 20 <20* <20* - - <br /> Cs -CH Hydrocarbons 20 420 420 420 <1 <br /> C9 -C1_ H\drocarbons 20 60 63 62 5 <br /> Gasoline Fraction{CS-C,2} 60 470 490 480 4 <br /> * Rmscd MRL dui. to high onak tc concentration requiring a dilution <br /> DUP I1JOW 194 <br /> Page <br />