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Americ an Envrr onmental Network <br /> PAGE 7 <br /> QUALITY CONTROL DATA <br /> METHOD EPA 624 <br /> AEN JOB NO 9703238 <br /> INSTRUMENT 12 <br /> MATRIX WATER <br /> Surrogate Standard Recovery Summary <br /> Percent Recovery <br /> Date 1 ,2-Dichloro- p-Bromofluoro- <br /> Analyzed Client Id Lab Id ethane-d4 Toluene-d8 benzene <br /> 03/24/97 CONUAULT 01 112 101 100 <br /> QC Limits 75-129 81-111 78-131 <br /> DATE ANALYZED 03/18/97 <br /> SAMPLE SPIKED 9703166-01 <br /> INSTRUMENT 12 <br /> Matrix Spike Recovery Summary <br /> QC Li ml is <br /> Spike <br /> Added Percent Percent <br /> Analyte (ug/L) Recovery RPD Recovery RPD <br /> i 1 -n,rhlnrnPthPnP 1�0 111 1 77-117 25 <br /> Trichloroethene 50 102 <1 89-142 25 <br /> Benzene 50 103 <1 83-121 25 <br /> Toluene 50 108 1 81-121 25 <br /> Chlorobenzene 50 115 2 88-124 25 <br />. Daily method blanks for all associated analytical runs showed no contamination <br /> at or above the reporting limit <br />