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American Environmental Network <br /> PAGE 17 <br /> QUALITY CONTROL DATA <br /> METHOD EPA 8260 <br /> AEN JOB NO 9703241 <br /> INSTRUMENT 13 <br /> MATRIX WATER <br /> Surrogate Standard Recovery Summary <br /> Percent Recovery <br /> Date 1 2-Dichloro- p-Bromotluoro- <br /> Analyzed Client Id Lab Id ethane-d4 Toluene-d8 benzene <br /> 03/31/97 MW-4 04 96 100 105 <br /> 03/31/97 MW-11 11 100 97 105 <br /> 03/31/97 MW-12 12 100 98 103 <br /> QC Limits 75-129 81-111 78-131 <br /> DATE ANALYZED 03/25/97 <br /> SAMPLE SPIKED 9703228-05 <br /> INSTRUMENT 13 <br /> Matrix Spike Recovery Summary <br /> QC Limits <br /> Spike <br /> Added Percent Percent <br /> Analyte (ug/L) Recovery RPD Recovery RPD <br /> 1 1-Dichloroethene 50 94 7 77-137 25 <br /> Benzene 50 96 12 89-142 25 <br /> Trichloroethene 50 95 7 83-121 25 <br /> Toluene 50 95 7 81-121 25 <br /> Chlorobenzene 50 100 7 88-124 25 <br /> Daily method blanks for all associated analytical runs showed no contamination <br /> at or above the reporting limit <br /> *** END OF REPORT *** <br />