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NEI/GTEL Client ID: BLAOICHV08 QUALITY CONTROL RESULTS <br /> Login Number W7040077 Volatile Organics <br /> Method: EPA 8020A <br /> �roJect ID (number): 970401-F1 <br /> ro�ect ID, (name)• CHEVRON/9 4275/2905 W BENJAMIN HOLT DR/STOCKTON/CA Matrix Aqueous <br /> Calibration Verification Sample Summary <br /> Spike Check Sample QC Percent Acceptability Limits <br /> Anal to Amount Concentration Recovery Recovery <br /> EPA 8020A Units ug/L QC Batch 040897GC14-1 <br /> Benzene 20.0 17 9 89 5 77-12,11 <br /> Toluene 20 0 17 4 87 0 77 5-122 5% <br /> Ethylbenzene 20 0 16 0 80 0 63-1371 <br /> Xylenes (Total) 60 0 56 0 93 3 85-115% <br /> TPH as Gasoline 500 564 113 80-120% <br /> Notes <br /> QC check source Supelco #LA12389 <br /> i <br /> • <br /> NEI/GTEL Wichita, KS <br /> W7040077 4 <br />