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Report Number: 42;ih <br /> QC Report : Matrix.Spikel Matrix Spike Duplicate . Date : 3/812005 <br /> Project Name : Valero <br /> Project Number : 1641.18 <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 42642-01 X0.50 40.0 40.0 41.5 40.2 uglL EPA 8260B 315105 104 101 3,05 70-130 25 <br /> Toluene 42642-01 <0.50 40.0 40.0 38.3 37.0 ug/L EPA 8260B 315105 95.9 92.6 3.52 70-130 25 <br /> Tert-Butanol 42642-01 <5.0 200 200 192 187 ug/L EPA 8260B 315105 96.1 93.6 2.72 70-130 25 <br /> Methyl-t-Butyl Ether42642-01 <0.50 40.0 40.0 38.4 37.8 uglL EPA 8260B 315105 96.0 94.6 1.44 70-130 25 <br /> Approved By: ,toe iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />