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0 • Report Number 20 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 117102 <br /> Project Name 420 West Kettleman Lane, <br /> Project Number 243-1346 <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 24029-05 <0 0050 00385 00394 00343 00335 mg/Kg EPA 8260B 111102 89 3 851 479 70-130 25 <br /> Toluene 24029-05 <0 0050 00385 00394 00327 00318 mg/Kg EPA 8260B 111102 84 9 80 7 507 70-130 25 <br /> Tert-Butanol 24029-05 <0 0050 0 192 0 197 0 153 0 153 mg/Kg EPA 82608 111102 794 779 1 92 70-130 25 <br /> Methyl-t-Butyl Ether 24029-05 <0 0050 00385 00394 00330 00332 mg/Kg EPA 8260B 111102 857 84 4 1 50 70-130 25 <br /> Approved KIFF ANALYTICAL, LLC 8y J I Ki <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />