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Report Number 38743 QC Report Matrix Spike/Matrix Spike Duplicate Date 6/18/2004 Project Name 7-Eleven Store #19976 Project Number 77EL 19976 04 Duplicate Spiked Duplicate Spiked Spiked Sample Relative Spike Spiked Spiked Sample Sample Relative Percent Percent Spiked Sample Spike DUD Sample Sample Analysis Date Percent Percent Percent Recov Diff Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff Limit Limit Benzene 38771-04 <0 50 400 400 41 0 405 ug/L EPA 8260B 6115104 102 101 124 70-130 25 Toluene 38771-04 <0 50 400 400 39 6 38 2 ug/L EPA 8260B 6115104 98 9 95 5 352 70-130 25 Tert-Butanol 38771-04 <5 0 200 200 203 201 ug/L EPA 8260E 6115104 101 101 0 685 70-130 25 Methyl-t-Butyl Ether 38771-04 <0 50 400 400 461 458 ug/L EPA 82608 6115/04 115 114 0 605 70-130 25 Benzene 38780-06 130 400 400 164 161 ug/L EPA 8260B 6117104 79 7 724 9 58 70-130 25 Toluene 38780-06 6 6 400 400 402 385 ug/L EPA 8260B 6117104 84 0 799 5 04 70-130 25 Tert-Butanol 38780-06 <5 0 200 200 190 196 ug/L EPA 8260B 6117104 948 980 333 70-130 25 Methyl-t-Butyl Ether 38780-06 <0 50 400 400 400 41 6 ug/L EPA 8260B 6117104 999 104 405 70-130 25 Benzene 38743-02 <0 50 400 400 387 370 ug/L EPA 8260B 6115104 968 924 4 61 70-130 25 Toluene 38743-02 <0 50 400 400 39 8 385 ug/L EPA 8260E 6/15104 995 962 337 70-130 25 Tert-Butanol 38743-02 <5 0 200 200 203 205 ug/L EPA 8260B 6115104 102 102 0 894 70-130 25 Methyl-t-Butyl Ether 38743-02 <0 50 400 400 414 41 7 ug/L EPA 8260B 6115104 104 104 0 586 70-130 25 Benzene 38735-01 <0 50 400 400 370 361 ug/L EPA 8260B 6115/04 926 902 260 70-130 25 Toluene 38735-01 <0 50 400 400 377 366 ug/L EPA 8260B 6115104 94 4 88 9 594 70-130 25 Tert-Butanol 38735-01 <5 0 200 200 185 183 ug/L EPA 8260B 6115104 923 91 4 0 992 70-130 25 Methyl-t-Butyl Ether 38735-01 <0 50 400 400 358 357 ug/L EPA 8260B 6115104 895 89 3 0 233 70-130 25 Approved By Jo iff KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800