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Report Number 38738 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 6/17/2004 <br /> Project Name 7-Eleven Store #14117 <br /> Project Number 77EL 14117 04 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked 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 38738-02 4 1 396 398 442 443 ug/L EPA 8260B 6115104 101 101 0 186 70-130 25 <br /> Toluene 38738-02 <0 50 39 6 398 39 2 400 ug/L EPA 82608 6115104 991 101 1 63 70-130 25 <br /> Tert-Butanol 38738-02 550 198 199 717 762 ug1L EPA 8260B 6115104 865 108 226 70-130 25 <br /> Methyl-t-Butyl Ether38738-02 6 5 396 398 452 463 ug/L EPA 8260B 6/15104 976 100 2 51 70-130 25 <br /> Benzene 38730-02 070 400 400 408 390 ug/L EPA 8260B 6115104 100 95 7 4 76 70-130 25 <br /> Toluene 38730-02 1 6 400 400 39 0 376 ug/L EPA 82608 6115/04 933 900 360 70-130 25 <br /> Tert-Butanol 38730-02 <5 0 200 200 199 203 ug/L EPA 8260E 6115104 996 102 192 70-130 25 <br /> Methyl-t-Butyl Ether 38730-02 <0 50 400 400 456 45 0 ug/L EPA 8260E 6115104 114 112 1 21 70-130 25 <br /> Benzene 38771-04 <0 50 400 400 41 0 405 ug/L EPA 8260B 6115104 102 101 124 70-130 25 <br /> Toluene 38771-04 <0 50 400 400 396 382 ug/L EPA 8260E 6115104 98 9 955 352 70-130 25 <br /> Tert-Butanol 38771-04 <5 0 200 200 203 201 ug/L EPA 8260E 6115104 101 101 0 685 70-130 25 <br /> Methyl-t-Butyl Ether38771-04 <0 50 400 400 461 458 ug/L EPA 82608 6/15/04 115 114 0 605 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 />