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Report Number: 33430 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date: 6/4/2003 <br /> Project Name : 7-Eleven Store#32262 <br /> Project Number: 77EL.32262.43 <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 33432-05 <0.0050 0.0397 0.0398 0.0373 0.0335 mg/Kg EPA 8260B 6/3/03 94.0 84.1 11.1 70-130 25 <br /> Toluene 33432-05 <0.0050 0.0397 0.0398 0.0372 0.0330 mg/Kg EPA 8260B 6/3/03 93.6 82.9 12.1 70-130 25 <br /> Tert-Butanol 33432-05 0.073 0.198 0.199 0.220 0.167 mg/Kg EPA 82608 6/3/03 74.4 47.5 44.1 70-130 25 <br /> Methyl-t-Butyl Ether 33432-05 1.1 0.0397 0.0398 1.00 0.745 mg/Kg EPA 8260B 6/3/03 0.00 0.00 0.00 70-130 25 <br /> Approved By: Jb�l Kiff <br /> KIFF ANALYTICAL, LLC � <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />