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Report Number 45478 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 8/25/2005 <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 /> Benzene 45478-02 <0 50 400 400 406 389 ug/L EPA 8260B 8120105 102 972 432 70-130 25 <br /> Toluene 45478-02 <0 50 400 400 404 408 ug/L EPA 8260B 8/20105 101 102 0 891 70-130 25 <br /> Tert-Butanol 45478-02 <5 0 200 200 233 230 ug/L EPA 8260B 8120105 117 115 153 70-130 25 <br /> Methyl-t-Butyl Ether 45478-02 <0 50 400 400 41 3 402 ug/L EPA 8260B 8120105 103 101 2 64 70-130 25 <br /> Benzene 45478-06 <0 50 400 400 41 8 408 ug/L EPA 8260B 8/23/05 104 102 225 70-130 25 <br /> Toluene 45478-06 <0 50 400 400 383 372 ug/L EPA 8260B 8/23/05 958 931 282 70-130 25 <br /> Tert-Butanol 45478-06 <5 0 200 200 208 208 ug/L EPA 82608 8/23/05 104 104 0 177 70-130 25 <br /> Methyl-t-Butyl Ether 45478-06 <0 50 400 400 446 442 ug/L EPA 8260B 8123105 112 110 0 996 70-130 25 <br /> Benzene 45477-01 <0 50 400 400 403 404 ug/L EPA 8260B 8123/05 101 101 0 134 70-130 25 <br /> Toluene 45477-01 <0 50 400 400 406 405 ug/L EPA 82608 8/23/05 101 101 0207 70-130 25 <br /> Tert-Butanol 45477-01 <5 0 200 200 196 198 ug/L EPA 8260B 8/23/05 978 988 1 05 70-130 25 <br /> Methyl-t-Butyl Ether45477-01 <0 50 400 400 370 36 3 ug/L EPA 8260B 8/23/05 92 4 90 8 1 75 70-130 25 <br /> Benzene 45491-04 2 0 400 400 423 399 ug/L EPA 8260B 8/24/05 101 949 607 70-130 25 <br /> Toluene 45491-04 <0 50 400 400 41 4 38 4 ug/L EPA 8260B 8/24/05 104 960 760 70-130 25 <br /> Tert-Butanol 45491-04 42 200 200 236 240 ug/L EPA 8260B 8/24/05 974 993 193 70-130 25 <br /> Methyl-t-Butyl Ether45491-04 1 7 400 400 404 39 7 ug/L EPA 8260B 8124/05 968 950 197 70-130 25 <br /> Benzene 45456-05 <0 50 400 400 405 394 ug/L EPA 8260B 8124105 101 985 2 74 70-130 25 <br /> Toluene 45456-05 <0 50 400 400 41 2 395 ug/L EPA 82608 8124/05 103 988 415 70-130 25 <br /> 4 <br /> Approved By io Iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />