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I <br /> Report Number: 31338 ' <br /> QC Report: Matrix Spike/Matrix Spike Duplicate Date : 02/21/2003 ` <br /> Project Name : Delta # 4509-T <br /> Project Number <br /> Duplicate Duplicate Spiked <br /> p 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 31411-06 <0.50 40.0 40.0 37.2 42.8 ug/L EPA 8260B 2/12/03 93.0 107 14.0 70-130 25 <br /> KIFF ANALYTICAL, LLC <br /> Approved By: J I Kiff <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />