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Report Number 45187 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 8110/2005 <br /> Project Name 7-Eleven Store#17334 <br /> Project Number 77EL 17334 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 /> Benzene 45181-02 <0 50 39 9 382 392 376 ug/L EPA 8260B 815105 981 984 0 328 70-130 25 <br /> Toluene 45181-02 <0 50 399 382 389 370 ug/L EPA 8260E 815105 976 971 0 475 70-130 25 <br /> Tert-Butanol 45181-02 <5 0 200 191 212 203 ug/L EPA 8260B 815105 106 106 0 170 70-130 25 <br /> Methyl-t-Butyl Ether45181-02 <0 50 399 382 38 6 366 ug/L EPA 82608 8!5105 96 7 95 8 0 994 70-130 25 <br /> I <br /> Benzene 45200-01 11 400 400 50 3 497 ug/L EPA 8260B 8/6105 989 974 1 60 70-130 25 <br /> Toluene 45200-01 61 400 400 471 427 ug/L EPA 82608 816105 102 91 5 114 70-130 25 <br /> Tert-Butanol 45200-01 67 200 200 283 275 ug/L EPA 8260B 816105 108 104 376 70-130 25 <br /> Methyl-t-Butyl Ether45200-01 42 400 400 800 812 ug/L EPA 8260B 816105 944 972 296 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 />