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Report Number: 18456 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date: 12/13/2000 <br /> Project Name . 620 W. Charter Way <br /> Project Number: <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 18456-01 <0.50 24.5 24.6 21.8 22.9 uglL EPA 8260E 12106120089.0 93.0 4.35 70-130 25 <br /> Toluene 18456-01 <0.50 24.5 24.6 21.4 22.7 uglL EPA 8260E 12106120087.5 92.4 5.45 70-130 25 <br /> Tert-Butanol 18456-01 <5.0 24.5 24.6 28.7 30.7 ug/L EPA 82608 12/061200117 125 6.28 70-130 25 <br /> Methyl-t-Butyl Ether 18456-01 0.85 24.5 24.6 30.2 28.9 uglL EPA 82608 121061200120 114 5.00 70-130 25 <br /> I <br /> i <br /> Approved By: Jpe! Kiff <br /> KIFF ANALYTICAL, LLC ` J <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 V <br />