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Report Number A <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 11/4/2005 <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 46680-03 <0 50 400 400 417 38 5 ug/L EPA 8260B 10/31/05 104 962 808 70-130 25 <br /> Toluene 46680-03 <0 50 400 400 41 0 379 ug/L EPA 8260E 10/31/05 102 948 773 70-130 25 <br /> Tert-Butanol 46680-03 <5 0 200 200 236 220 ug/L EPA 8260E 10/31/05 118 110 738 70-130 25 <br /> Methyl-t-Butyl Ether 46680-03 <0 50 400 400 380 359 ug/L EPA 8260E 10/31/05 951 89 8 572 70-130 25 <br /> Benzene 46691-01 <0 50 400 400 41 0 404 ug/L EPA 8260B 1112105 102 101 1 27 70-130 25 <br /> Toluene 46691-01 <0 50 400 400 41 2 403 ug/L EPA 82608 1112105 103 101 2 15 70-130 25 <br /> Tert-Butanol 46691-01 <50 200 200 213 211 ug/L EPA 82606 1112105 107 106 1 05 70-130 25 <br /> Methyl-t-Butyl Ether46691-01 <0 50 400 400 381 386 ug/L EPA 8260B 1112105 954 966 1 27 70-130 25 <br /> Benzene 46689-01 1 8 400 400 41 7 389 ug/L EPA 82606 10/31/05 995 926 716 70-130 25 <br /> Toluene 46689-01 <0 50 400 400 408 377 ug/L EPA 8260B 10/31/05 102 942 793 70-130 25 <br /> Tert-Butanol 46689-01 <50 200 200 218 205 ug/L EPA 8260B 10/31/05 109 102 613 70-130 25 <br /> Methyl-t-Butyl Ether 46689-01 17 400 400 553 522 ug/L EPA 8260E 10/31/05 953 876 843 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 />