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• s • <br /> Report Number 41497 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 12/22/2004 <br /> Project Name 7-Eleven Store #19976 <br /> Project Number 77EL.19976.04 <br /> Siked <br /> Duplicate Spiked SSpiked to 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 41489-01 <0 50 400 400 402 39 3 ug/L EPA 8260B 12/17/04 100 984 2 14 70-130 25 <br /> Toluene 41489-01 <0 50 400 400 397 376 ug/L EPA 8260B 12/17/04 992 941 529 70-130 25 <br /> Tert-Butanol 41489-01 <5 0 200 200 202 200 ug/L EPA 82608 12/17/04 101 100 0 643 70-130 25 <br /> Methyl-t-Butyl Ether41489-01 <0 50 400 400 408 41 2 ug/L EPA 8260B 12/17/04 102 103 1 11 70-130 25 <br /> Benzene 41497-06 1 4 400 400 416 406 ug1L EPA 8260B 12/18/04 100 980 243 70-130 25 <br /> Toluene 41497-06 6 0 400 400 451 434 ug/L EPA 8260B 12/18/04 979 936 446 70-130 25 <br /> Tert-Butanol 41497-06 <5 0 200 200 204 197 ug/L EPA 8260B 12/18/04 102 986 349 70-130 25 <br /> Methyl-t-Butyl Ether41497-06 <0 50 400 400 413 41 0 ug/L EPA 8260B 12/18/04 103 102 0 694 70-130 25 <br /> Benzene 41490-01 <0 50 400 400 439 434 ug/L EPA 8260B 12/17/04 110 108 1 13 70-130 25 <br /> Toluene 41490-01 <0 50 400 400 384 370 ug/L EPA 8260B 12/17/04 960 925 368 70-130 25 <br /> Tert-Butanol 41490-01 <5 0 200 200 192 197 ug/L EPA 8260B 12/17/04 962 983 219 70-130 25 <br /> Methyl-t-Butyl Ether41490-01 <0 50 400 400 420 333 ug/L EPA 82606 12/17/04 105 833 231 70-130 25 <br /> Benzene 41507-01 <0 50 400 400 443 441 ug/L EPA 82608 12/17/04 111 110 0 289 70-130 25 <br /> Toluene 41507-01 <0 50 400 400 380 377 ug/L EPA 82606 12/17/04 951 94 2 0 922 70-130 25 <br /> Tart-Butanol 41507-01 <5 0 200 200 191 193 ug/L EPA 8260B 12/17/04 955 967 1 25 70-130 25 <br /> Methyl-t-Butyl Ether41507-01 <0 50 400 400 41 1 41 0 ug/L EPA 8260B 12/17/04 103 103 0 156 70-130 25 <br /> Benzene 41540-03 17 40 0 400 58 2 569 ug/L EPA 8260B 12/18/04 102 992 323 70-130 25 <br /> Toluene 41540-03 1 3 400 400 409 39 2 ug/L EPA 8260B 12/18/04 991 94 7 4 51 70-130 25 <br /> KIFF ANALYTICAL, LLC Approved By Jo iff <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br /> I <br />