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Report Number: 23219 <br /> QC Report: Matrix Spike/ Matrix Spike Duplicate Date : 11/9/2001 <br /> Project Name : Chevron 90557 <br /> Project Number: 077.43445.350 <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 /> Spike Recovery Data <br /> Benzene 23181-01 <0.50 19.4 19.1 20.0 19.9 ug/L EPA 8260B 111712001103 104 0.795 70-130 25 <br /> Toluene 23181-01 1.9 19.4 19.1 21.7 21.4 ug/L EPA 8260E 111712001102 102 0.120 70-130 25 <br /> Tert-Butanol 23181-01 <5.0 96.9 95.4 103 103 ug/L EPA 8260E 111712001106 108 1.78 70-130 25 <br /> Methyl-t-Butyl Ether 23181-01 8.7 19.4 19.1 24.7 24.4 ug/L EPA 8260B 11171200182.4 82.1 0.390 70-130 25 <br /> Approved By: 16el Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />