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Report Number: 24713 <br /> QC Report: Matrix Spike/Matrix Spike Duplicate Date : 2/20/2002 <br /> Project Name: 404 West Fremont St. <br /> Project Number: 1628.10 <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 24713-01 X0.50 19.4 19.8 19.6 19.7 ug/L EPA 82608 2/9/2002 101 99.7 1.15 70-130 25 <br /> Toluene 24713-01 a0.50 19.4 19.8 19.4 19.8 ug/L EPA 8260B 2/9/2002 100 100 0.300 70-130 25 <br /> Tert-Butanol 24713-01 5.1 97.0 99.0 93.5 96.1 ug/L EPA 8260B 2/9/2002 91.2 91.9 0.810 70-130 25 <br /> Methyl-t-Butyl Ether 24713-01 1.2 19.4 19.8 20.8 20.2 ug/l_ EPA 8260B 2/9/2002 101 95.9 5.40 70-130 25 <br /> Approved By: J6e1 Kiff qJ <br /> KIFF ANALYTICAL, LLC I 'f <br /> 720 Olive Drive, Suite D Davis,CA 95616 530-297-4800 <br />