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Report Number 40233 QC Report Matrix Spike/Matrix Spike Duplicate Date 9/28/2004 Project Name 7-Eleven Store#17334 Project Number 77EL 17334 04 Duplicate Spiked Duplicate Spiked Spiked Sample Relative Spike Spiked Spiked Sample Sample Relative Percent Percent Spiked Sample Spike Dup 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 40241-01 <0 50 400 400 384 378 ug/t_ EPA 8260B 9123104 961 944 180 70-130 25 Toluene 40241-01 <0 50 400 400 380 371 ug/L EPA 8260B 9123104 951 928 242 70-130 25 Tert-Butanol 40241-01 <5 0 200 200 184 184 ug/L EPA 8260B 9123104 91 9 91 9 00519 70-130 25 Methyl-t-Butyl Ether 40241-01 <0 50 400 400 407 401 ug/L EPA 8260B 9123104 102 100 144 70-130 25 Benzene 40252-05 <0 50 400 400 387 370 ug/L EPA 8260B 9124104 96 7 925 443 70-130 25 Toluene 40252-05 <0 50 400 400 38 6 373 ug/L EPA 8260B 9124104 964 934 320 70-130 25 Tert-Butanol 40252-05 <5 0 200 200 193 191 ug/L EPA 82608 9124/04 965 957 0 885 70-130 25 Methyl-t-Butyl Ether 40252-05 <0 50 400 400 39 6 395 ug/L EPA 82608 9124104 99 0 988 0 233 70-130 25 Benzene 40294-02 <0 50 400 400 398 39 0 ug/L EPA 8260B 9127104 99 5 974 213 70-130 25 Toluene 40294-02 <0 50 400 400 391 388 ug/L EPA 8260B 9127104 977 969 0 788 70-130 25 Tert-Butanol 40294-02 <5 0 200 200 196 192 ug/L EPA 8260B 9127104 98 2 961 2 21 70-130 25 Methyl-t-Butyl Ether40294-02 75 400 400 119 118 ug/L EPA 8260B 9127104 110 106 277 70-130 25 Benzene 40251-01 <0 50 400 400 398 396 ug/L EPA 82608 9123104 995 990 0 500 70-130 25 Toluene 40251-01 <0 50 400 400 377 392 ug1L EPA 8260B 9123104 94 2 980 394 70-130 25 Tert-Butanol 40251-01 <50 200 200 172 206 ug/L EPA 82606 9123104 861 103 181 70-130 25 Methyl-t-Butyl Ether40251-01 <0 50 400 400 389 38 3 ug/L EPA 8260B 9123104 973 958 1 64 70-130 25 Approved By Jo iff KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-2974800