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� Report Number 50017 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 05/2212006 <br /> Project Name 7-Eleven Store #19976 <br /> Project Number 77EL.19976 05 <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 /> Tert-Butanol 50099-02 220 200 200 404 408 ug/L EPA 82606 5119106 927 944 1 78 70-130 25 <br /> Methyl-t-Butyl Ether 50099-02 <0 50 400 400 39 7 398 ug/L EPA 8260B 5/19106 994 996 0 225 70-130 25 <br /> Benzene 50111-05 <0 50 400 400 392 38 7 ug/L EPA 82606 5122/06 979 96 7 1 23 70-130 25 <br /> Toluene 50111-05 <0 50 400 400 39 3 38 4 ug/L EPA 8260B 5/22106 98 2 960 232 70-130 25 <br /> Tert-Butanol 50111-05 <5 0 200 200 201 198 ug/L EPA 8260B 5122106 100 991 127 70-130 25 <br /> Methyl-t-Butyl Ether 50111-05 <0 50 400 400 370 369 ug/L EPA 82606 5/22106 92 5 92 3 0 276 70-130 25 <br /> Approved By ,!o iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />