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i ! i Report Number 35498 QC Report Matrix Spike/Matrix Spike Duplicate Date 10/31/2003 Project Name 7-Eleven Store #20632 Protect Number 77EL 20632 03 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 35472-01 <0 50 398 399 412 41 9 ug/L EPA 8260B 10/25/03 104 105 122 70-130 25 Toluene 35472-01 <0 50 398 39 9 427 429 ug/L EPA 8260B 10/25/03 107 107 0 140 70-130 25 Tert-Butanol 35472-01 <50 199 200 204 202 ug/L EPA 8260B 10/25/03 102 101 1 05 70-130 25 Methyl-t-Butyl Ether 35472-01 <0 50 398 399 387 401 ug/L EPA 82606 10/25/03 973 100 326 70-130 25 Benzene 35505-07 <0 50 400 400 390 391 ug/L EPA 82606 10/26/03 974 976 0 231 70-130 25 Toluene 35505-07 <0 50 400 400 403 401 ug/L EPA 8260B 10/26/03 101 100 0 323 70-130 25 Tert-Butanol 35505-07 <5 0 200 200 212 212 ug/L EPA 8260B 10/26/03 106 106 0 179 70-130 25 Methyl-t-Butyl Ether 35505-07 <0 50 400 400 406 405 ug/L EPA 82606 10/26/03 102 101 0 172 70-130 25 Benzene 35513-04 <0 50 400 400 366 358 uglL EPA 8260B 10/27/03 91 5 89 6 213 70-130 25 Toluene 35513-04 <0 50 400 400 382 371 ug/L EPA 8260B 10/27/03 956 92 8 3 02 70-130 25 Tert-Butanol 35513-04 <5 0 200 200 207 205 ug/L EPA 8260B 10/27/03 104 103 0 829 70-130 25 Methyl-t-Butyl Ether 35513-04 <0 50 400 400 334 333 ug/L EPA 8260B 10/27/03 835 832 0 450 70-130 25 Benzene 35544-02 21 400 400 41 9 405 ug1L EPA 8260B 10/31/03 995 96 2 342 70-130 25 Toluene 35544-02 <0 50 400 400 413 409 ug/L EPA 82608 10/31/03 103 102 0 924 70-130 25 Tert-Butanol 35544-02 <5 0 200 200 205 206 ug/L EPA 8260B 10/31/03 102 103 0 613 70-130 25 Methyl-t-Butyl Ether 35544-02 <0 50 400 400 433 407 ug/L EPA 82606 10/31/03 108 102 621 70-130 25 Benzene 35491-20 <0 50 400 400 410 393 ug/L EPA 82606 10/27/03 102 982 4 31 70-130 25 Toluene 35491-20 <0 50 400 400 41 6 388 ug/L EPA 82606 10/27/03 104 970 689 70-130 25 paj law Approved By R P Furry KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800