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NEI/GTEL Client ID: EMC05CHV13 QUALITY CONTROL RESULTS <br /> Login Number: W7050440 Volatile Organics <br /> Project ID (number): 22560-203.002 Method: EPA 8020A <br /> Project ID (name): CHEVRON PIPELINE/MT VIEW TOWNNHOMES/TRACY/CA Matrix: Aqueous <br /> Calibration Verification Sample Summary <br /> Spike Check Sample OC Percent Acceptability Limits <br /> Analyte Amount Concentration Recovery Recovery <br /> EPA 8020A Units:ug/L QC Batch:060397GC17.1 <br /> Benzene 20.0 20.9 105. 77-123% <br /> Toluene 20.0 20.1 101. 77.5-122.5% <br /> .:.. .:..... <br /> Eth lbenzene' 20.0 20.T.. 101 63-137% ::;::::.:::::::<:::: .;:::.:..::;::::>: <br /> :::..::.::.;;..::::;•;:.;:..::::... <br /> Xylenes (Total) 60.0 65.4 109. 85-115% <br /> H as Gasoline'' 500 : 56fi>;::::>:>::>:>:> .. ...."113. 80''120% <br /> Notes: <br /> OC check source: Supelco #LA12389 <br /> NEI/GTEL Wichita, KS <br /> W7050440:4 <br />