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PAGE 8 <br /> QUALITY CONTROL DATA <br /> METHOD: EPA 8020, 5030 GCFID <br /> AEN JOB NO: 9706253 <br /> INSTRUMENT: H <br /> MATRIX: WATER <br /> Surrogate Standard Recovery Summary <br /> Percent Recovery <br /> Date <br /> Analyzed Client Id. Lab Id. Fluorobenzene <br /> 06/24/97 TW-1 01 99 <br /> 06/23/97 EB-1 02 101 <br /> QC Limits: 70-130 <br /> DATE ANALYZED: 06/20/97 <br /> SAMPLE SPIKED: LCS <br /> INSTRUMENT: H <br /> Laboratory Control Sample <br /> QC Limits <br /> Spike LCS LCSD LCS <br /> Conc. Result Result Percent Percent <br /> Analyte (ug/L) (ug/L) (ug/L) Recovery RPD Recovery RPD <br /> Benzene 16.7 17.6 17.9 105 2 80-127 20 <br /> Toluene 59.3 60.4 60.6 102 <1 85-122 20 <br /> HCs as Gasoline 500 510 542 102 6 85-125 20 <br /> *** END OF REPORT *** <br />