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1 <br /> Report Number 42223 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 2/9/2005 <br /> Project Name 7-Eleven Store #20632 <br /> Protect Number 77EL 20632.04 <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 42164-06 14 384 386 407 41 4 ug/L EPA 8260B 2/4105 102 103 100 70-130 25 <br /> Toluene 42164-06 <0 50 384 386 398 41 1 ug/L EPA 8260E 2/4/05 104 106 2 62 70-130 25 <br /> Tert-Butano[ 42164-06 <5 0 192 193 211 215 ug/L EPA 82606 2/4/05 110 111 0 897 70-130 25 <br /> Methyl-t-Butyl Ether42164-06 <0 50 384 386 338 347 ug/L EPA 8260B 2/4/05 881 898 190 70-130 25 <br /> Benzene 42236-02 <0 50 388 388 351 35 6 ug/L EPA 8260B 2/8/05 906 91 8 120 70-130 25 <br /> Toluene 42236-02 <0 50 38 8 38 8 384 39 3 ug/L EPA 82606 218/05 992 101 209 70-130 25 <br /> Tert-Butanol 42236-02 <50 194 194 181 190 ug/L EPA 8260B 2/8105 936 980 4 62 70-130 25 <br /> Methyl-t-Butyl Ether 42236-02 <0 50 388 388 305 299 ug/L EPA 8260B 2/8105 787 770 215 70-130 25 <br /> Benzene 42235-05 <0 50 400 400 416 407 ug/L EPA 8260B 2/9105 104 102 228 70-130 25 <br /> Toluene 42235-05 <0 50 400 400 41 6 408 ug/L EPA 82606 2/9105 104 102 2 06 70-130 25 <br /> Tert-Butanol 42235-05 <5 0 200 200 215 221 ug/L EPA 82606 2/9105 108 110 260 70-130 25 <br /> Methyl-t-Butyl Ether42235-05 0 84 400 400 380 384 ug/L EPA 8260B 2/9/05 928 939 1 15 70-130 25 <br /> I <br /> I � <br /> Approved By Jo if€ <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />