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Report Number 35497 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 10/31/2003 <br /> I <br /> Project Name 7-Eleven Store #21756 <br /> Project Number 77EL 21756 03 <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 35507-08 20 400 400 219 216 ug/L EPA 82608 10/26/03 498 489 1 68 70-130 25 <br /> Toluene 35507-08 2 5 400 400 676 672 ug/L EPA 82608 10/26/03 162 162 0 524 70-130 25 <br /> Tert-Butanol 35507-08 <5 0 200 200 213 215 ug/L EPA 8260B 10/26/03 107 108 0 854 70-130 25 <br /> Methyl-t-Butyl Ether 35507-08 069 400 400 34 7 339 ug/L EPA 8260B 10/26/03 850 831 223 70-130 25 <br /> 4-L low <br /> Approved By R P Furry <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />