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Report Number: 33157 <br /> QC Report: Matrix Spike/Matrix Spike Duplicate Date : 5/21/2003 - <br /> Project Name : 420 W. Kettleman Lane, <br /> Project Number: 1346 <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 33166-01 <0.0050 0.0794 0.0797 0.0687 0.0694 mg/Kg EPA 82608 5/18/03 86.6 87.0 0.518 70-130 25 <br /> Toluene 33166-01 <0.0050 0.0794 0.0797 0.0621 0.0612 mg/Kg EPA 8260B 5118/03 78.3 76.8 1.97 70-130 25 <br /> Methyl-t-Butyl Ether 33166-01 <0.0050 0.0794 0.0797 0.0714 0.0719 mg/Kg EPA 8260B 5/18/03 90.0 90.3 0.361 70-130 25 <br /> Approved By: J I Kiff <br /> KIFF ANALYTICAL, LLC y <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />