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Report Number: 56273 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date : 5/8/2007 <br /> Project Name : 7-Eleven Store #14117 <br /> Project Number: 77EL.14117.07 <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 /> Tert-Butanol 56273-01 <5.0 200 200 196 194 ug/L EPA 82608 5/4/07 98.0 97.2 0.888 70-130 25 <br /> Methyl-t-Butyl Ether.56273-01 <0.50 40.0 40.0 33.8 32.7 ug/L EPA 8260B 5/4/07 84.4 81..8 3.03 70-130 25 <br /> �1 <br /> Approved By: Joe iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd Street, Suite 300 Davis, CA 95618 530-297-4800 <br />