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Report Number: 66958 <br /> QC Report: Matrix Spike/Matrix Spike Duplicate Date : 01/27/2009 <br /> Project Name : 7-Eleven Store #20632 <br /> Project Number: 77EL.20632.48 <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 /> Benzene 66921-01 <0.0050 0.0388 0.0386 0.0310 0.0313 mg/Kg EPA 8260B 1/21/09 80.0 81.0 1.24 70-130 25 <br /> Methyl-t-butyl ether 66921-01 <0.0050 0.0390 0.0389 0.0274 0.0280 mg/Kg EPA 8260B 1/21/09 70.1 72.0 2.77 70-130 25 <br /> Tert-Butanol 66921-01 <0.0050 0.197 0.197 0.186 0.186 mg/Kg EPA 82606 1/21/09 94.2 94.4 0.200 70-130 25 <br /> Toluene 66921-01 <0.0050 0.0396 0,0394 0.0291 0.0302 mg/Kg EPA 8260B 1/21/09 73.5 76.5 4.06 70-130 25 <br /> Toluene 66958-01 <0.0050 0.0397 0.0397 0.0305 0.0329 mg/Kg EPA 82606 1/23/09 76.8 . 82.9 7.65 70=1.30 25 <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd Street, Suite 300 Davis, CA 95618 530-297-4800 <br />