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Report Number 41497 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 12/22/2004 <br /> Project Name 7-Eleven Store#19976 <br /> Project Number 77EL.19976.04 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike SpikedSpiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike Dup 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 /> Tert-Butanol 41540-03 10 200 200 223 216 ug/L EPA 8260E 12/18/04 106 102 377 70-130 25 <br /> Methyl-t-Butyl Ether41540-03 1600 400 400 1480 1390 ug/L EPA 8260B 12/18/04 000 000 000 70-130 25 <br />� I <br /> I <br /> I <br /> I <br /> i <br /> i <br /> Approved By Jo iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 W. CA 95616 530-297-4800 • <br />