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Report Number 41347 QC Report Matrix Spike/Matrix Spike Duplicate Date 12/14/2004 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 41368-06 <0 50 399 398 354 376 ug/L EPA 82606 12/10/04 88 7 944 614 70-130 25 Toluene 41368-06 <0 50 399 398 357 381 ug/L EPA 8260B 12/10/04 894 95 7 6 87 70-130 25 Tert-Butanol 41368-06 <5 0 200 199 176 200 ug/L EPA 8260B 12/10/04 88 3 100 129 70-130 25 Methyl-t-Butyl Ether 41368-06 <0 50 399 398 352 385 ug/L EPA 8260B 12/10/04 883 966 900 70-130 25 Benzene 41325-08 220 397 398 246 252 ug/L EPA 8260B 12/11/04 644 774 184 70-130 25 Toluene 41325-08 1 6 397 398 378 377 ug/L EPA 8260B 12/11/04 91 1 908 0 300 70-130 25 Tert-Butanol 41325-08 30 198 199 227 234 ug/L EPA 8260B 12/11/04 990 102 327 70-130 25 Methyl-t-Butyl Ether41325-08 <0 50 397 39 8 380 38 4 ug/L EPA 8260B 12/11/04 95 9 965 0 643 70-130 25 I Benzene 41347-01 <0 50 400 400 424 412 ug/L EPA 8260B 1219/04 106 103 291 70-130 25 j Toluene 41347-01 <0 50 400 400 388 380 ug/L EPA 8260B 12/9/04 971 95 0 212 70-130 25 Tert-Butanol 41347-01 <5 0 200 200 193 187 ug/L EPA 8260B 12/9104 963 933 314 70-130 25 Methyl-t-Butyl Ether-41347-01 <0 50 400 400 432 421 ug/L EPA 8260B 12/9104 108 105 245 70-130 25 I Benzene 41347-02 <0 50 400 400 402 39 6 ug/L EPA 8260B 1219104 101 990 1 59 70-130 25 Toluene 41347-02 <0 50 400 400 396 398 ug/L EPA 8260E 1219104 989 995 0 597 70-130 25 Tert-Butanol 41347-02 12 200 200 207 212 ug/L EPA 8260B 1219104 976 100 237 70-130 25 Methyl-t-Butyl Ether41347-02 4 0 400 400 425 432 ug/L EPA 8260B 1219104 962 980 185 70-130 25 I Approved By Jo iff KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-2974800 I