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Report Number 32828 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 4/29/2003 <br /> Protect Name 7-Eleven Store # 14117 <br /> Protect Number 77EL 14117 43 <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 32818-01 <0 0050 00388 00402 00341 00350 mg1Kg EPA 8260B 4123103 878 869 1 06 70-130 25 <br /> Toluene 32818-01 <0 0050 00388 00402 00334 00344 mg/Kg EPA 8260B 4123103 86 0 85 5 0 612 70-130 25 <br /> Tert-Butanol 32818-01 <0 0050 0 194 0201 0 158 0 161 mg/Kg EPA 8260B 4123103 81 2 79 9 1 68 70-130 25 <br /> Methyl-t-Butyl Ether 32818-01 <0 0050 00388 00402 00344 00346 mg/Kg EPA 8260B 4123103 886 860 301 70-130 25 <br /> I <br /> Approved By Joel Kiff � <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 v <br />