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Report Number 11204 <br /> QC Report Method Spikes/Method Spike Duplicates Date 03/09/98 <br /> Project Name 1444 Mariposa <br /> Project Number 2938 03 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike Duo Sample Sample Analysis Date Percent Percent Percent Recov Diff <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff Limit Limit <br /> Water Spike Recovery Data <br /> Toluene Blank <0 50 358 358 384 377 ug/L EPA 8020 03/04/98 107 105 1 75 70-130 25 <br /> Ethylbenzene Blank <0 50 800 800 7 85 777 ug/L EPA 8020 03/04/98 982 971 105 70-130 25 <br /> TPH as Gasoline Blank X50 500 500 493 487 ug/L M EPA 8015 03/04/98 98 7 974 1 31 70-130 25 <br /> it <br /> a <br /> n5 O <br /> I m Approved By 'oel Kiff <br /> z �^ KIFF ANALYTICAL, LLC <br /> ^ �/�' 720 Olive Drive, Suite D Davis, CA 95616 916-297-4800 <br />