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i • i <br /> Report Number 40181 <br /> OC Report Matrix Spike/Matrix Spike Duplicate Date 9/24/2004 <br /> Project Name 7-Eleven Store #14117 <br /> Project Number 77EL 14117 04 <br /> Siked <br /> Duplicate Spiked Spiked to Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike DUD 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 40196-03 <0 50 400 39 8 390 390 ug/L EPA 8260B 9123104 974 980 0 568 70-130 25 <br /> Toluene 40196-03 <0 50 400 398 360 363 ug/L EPA 82606 9123104 900 91 1 127 70-130 25 <br /> Tert-Butanol 40196-03 <50 200 199 203 205 ug/L EPA 8260B 9123104 101 103 138 70-130 25 <br /> Methyl-t-Butyl Ether 40196-03 25 400 398 58 8 621 ug/L EPA 8260B 9123104 849 935 963 70-130 25 <br /> Benzene 40177-01 <0 50 400 400 393 38 0 ug/L EPA 8260E 9121104 982 951 320 70-130 25 <br /> Toluene 40177-01 <0 50 400 400 390 374 ug/L EPA 8260B 9121104 976 935 423 70-130 25 <br /> Tert-Butanol 40177-01 <5 0 200 200 194 194 ug/L EPA 8260B 9121/04 972 971 0 116 70-130 25 <br /> Methyl-t-Butyl Ether 40177-01 250 400 400 285 280 ug/L EPA 8260B 9121104 940 800 161 70-130 25 <br /> Benzene 40214-01 <0 50 400 400 376 367 ug/L EPA 8260E 9122104 94 0 917 242 70-130 25 <br /> Toluene 40214-01 <0 50 400 400 366 377 ug/L EPA 8260E 9/22/04 914 942 297 70-130 25 <br /> Tert-Butanol 40214-01 <50 200 200 204 210 ug/L EPA 8260B 9122/04 102 105 2 84 70-130 25 <br /> Methyl-t-Butyl Ether 40214-01 096 400 400 363 384 ug/L EPA 8260E 9122104 884 936 571 70-130 25 <br /> Benzene 40181-02 <0 50 400 400 400 391 ug/L EPA 8260B 9120104 100 97 7 240 70-130 25 <br /> Toluene 40181-02 <0 50 400 400 408 39 8 ug/L EPA 8260B 9120104 102 996 240 70-130 25 <br /> Tert-Butanol 40181-02 520 200 200 709 728 ug/L EPA 82608 9120104 967 106 918 70-130 25 <br /> Methyl-t-Butyl Ether 40181-02 56 400 400 485 488 ug/L EPA 8260B 9120104 107 108 0 720 70-130 25 <br /> Benzene 40188-09 <0 50 400 400 404 392 ug/L EPA 82608 9121104 101 980 301 70-130 25 <br /> Toluene 40188-09 <0 50 400 400 392 389 ug/L EPA 82608 9/21104 98 0 972 0 866 70-130 25 <br /> 4 <br /> Approved By Jo Iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-2974800 <br />