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Report Number 44291 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 6/17/2005 <br /> Project Name 7-Eleven Store #20632 <br /> Project Number 77EL 20632 05 <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 /> i <br /> Benzene 44263-02 <0 50 399 39 9 38 5 38 6 ug/L EPA 8260B 6114105 965 968 0 393 70-130 25 <br /> Toluene 44263-02 <0 50 399 399 41 6 404 ug/L EPA 82608 6/14105 104 101 2 86 70-130 25 <br /> Tert-Butanol 44263-02 <5 0 200 200 197 198 ug/L EPA 8260B 6114/05 98 8 994 0 576 70-130 25 <br /> Methyl-t-Butyl Ether 44263-02 <0 50 39 9 399 324 31 8 ug/L EPA 8260B 6114105 81 1 79 7 1 72 70-130 25 <br /> Benzene 44291-02 <0 50 400 400 424 41 0 ug/L EPA 8260B 6111105 106 102 321 70-130 25 <br /> Toluene 44291-02 <0 50 400 400 35 7 41 0 ug/L EPA 8260B 6111105 892 103 140 70-130 25 <br /> Tert-Butanol 44291-02 <5 0 200 200 208 212 ug/L EPA 82608 6111105 104 106 196 70-130 25 <br /> Methyl-t-Butyl Ether44291-02 <0 50 400 400 381 360 ug/L EPA 8260B 6111105 952 900 557 70-130 25 <br /> Benzene 44268-03 <0 50 400 400 406 390 ug/L EPA 82608 6114/05 102 974 4 17 70-130 25 <br /> Toluene 44268-03 <0 50 400 400 41 3 404 ug/L EPA 82608 6114105 103 101 2 19 70-130 25 <br /> Tert-Butanol 44268-03 <5 0 200 200 208 206 ug/L EPA 8260B 6114105 104 103 0 892 70-130 25 <br /> Methyl-t-Butyl Ether 44268-03 <0 50 400 400 378 378 ug/L EPA 82608 6114105 94 4 944 00553 70-130 25 <br /> i <br /> Benzene 44300-04 <0 50 400 400 427 41 7 ug/L EPA 8260B 6/15/05 107 104 2 33 70-130 25 <br /> Toluene 44300-04 1 1 400 400 444 436 ug/L EPA 8260B 6115105 108 106 183 70-130 25 <br /> Tert-Butanol 44300-04 <5 0 200 200 215 213 ug/L EPA 8260B 6/15105 108 106 1 18 70-130 25 <br /> Methyl-t-Butyl Ether44300-04 <0 50 400 400 401 401 ug/L EPA 8260B 6115105 100 100 00881 70-130 25 <br /> Benzene 44315-02 <0 50 400 400 401 39 4 ug/L EPA 82608 6/16/05 100 985 180 70-130 25 <br /> Toluene 44315-02 <0 50 400 400 408 401 ug/L EPA 8260B 6116105 102 100 1 89 70-130 25 <br /> Approved By Jo off <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-2974800 <br />