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Report Number 42224 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 2/8/2005 <br /> Protect Name 7-Eleven Store #20632 <br /> Protect Number 77EL.20632 04 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> SpikeSpiked 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 L+mit Limit <br /> Benzene 42157-01 <0 0050 00384 00380 00354 00345 mg/Kg EPA 82606 213105 923 907 1 78 70-130 25 <br /> Toluene 42157-01 <0 0050 00384 00380 00330 00322 mg/Kg EPA 8260B 213105 86 0 847 1 53 70-130 25 <br /> Tert-Butanol 42157-01 <0 0050 0 192 0 190 0 168 0 162 mg/Kg EPA 8260B 213105 87 4 850 283 70-130 25 <br /> Methyl-t-Butyl Ether42157-01 <0 0050 00384 00380 00329 00330 mg/Kg EPA 82606 2!3105 856 869 149 70-130 25 <br /> I <br /> I <br /> Approved By Joe iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />