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Report Number 37496 <br /> I <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 3/25/2004 <br /> Project Name COX COX <br /> Project Number <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked 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 /> Methyl-t-Butyl Ether 37573-01 59 400 400 471 465 ug/L EPA 8260B 3122104 103 102 149 70-130 25 <br /> i <br /> I <br /> E !L <br /> Approved By ;Je D I <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />