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Report Number 38593 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 6/1112004 <br /> Project Name 7-Eleven Store #32262 <br /> Project Number 77EL 32262.04 <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 38595-01 <0 0050 00402 00398 00372 00337 mg/Kg EPA 8260B 615104 927 846 918 70-130 25 <br /> Toluene 38595-01 <0 0050 00402 00398 00401 00354 mg/Kg EPA 8260E 615104 100 887 11 9 70-130 25 <br /> Tert-Butanol 38595-01 <0 0050 0201 0 199 0 186 0 165 mg/Kg EPA 82608 6/5104 925 82 8 11 0 70-130 25 <br /> Methyl-t-Butyl Ether 38595-01 <0 0050 00402 00398 00329 00324 mg/Kg EPA 8260B 615104 820 814 0 757 70-130 25 <br /> Approved By Jo iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />