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Report Number : 63745 <br /> QC Report : Matrix Spike/ Matrix Spike Duplicate Date : 07/23/2008 <br /> Project Name : 7-Eleven Store #21756 <br /> Project Number: 77EL.21756.08 <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 /> Lead 63730-02 3.5 50.0 50.0 53.2 53.0 mg/Kg EPA 6010B 7118/08 99.3 99.1 0.235 75-120 20 � <br /> t <br /> Benzene 63733-01 <0.0050 0.0400 0.0394 0.0368 0.0359 mg/Kg EPA 82608 7116108 91.8 91.0 0.892 70-130 25 <br /> Methyl-t-butyl ether 63733-01 <0.0050 0.0400 0.0394 0.0365 0.0358 mg/Kg EPA 82608 7/16/08 91.2 90.9 0.332 70-130 25 <br /> Toluene 63733-01 <0.0050 0.0395 0.0388 0.0363 0.0353 mg/Kg EPA 8260B 7116108 92.0 90.9 1.17 70-130 25 <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd Street, Suite 300 Davis, CA 95618 530-297-4800 <br />