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Report Number 41772 QC Report Matrix Spike/Matrix Spike Duplicate Date 1/5/2005 Protect Name 7-Eleven Store#14117 Protect Number 77EL.14117.04 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 41772-05 <0 50 399 398 410 39 4 ug/L EPA 8260B 12/30/04 103 991 3 52 70-130 25 Toluene 41772-05 <0 50 39 9 39 8 431 41 2 ug/L EPA 82608 12/30/04 108 104 4 16 70-130 25 Tert-Butanol 41772-05 <5 0 200 199 221 210 ug/L EPA 82606 12/30/04 111 105 4 91 70-130 25 Methyl-t-Butyl Ether 41772-05 <0 50 399 398 306 29 5 ug/L EPA 8260B 12/30/04 766 74 3 3 05 70-130 25 Benzene 41678-01 190 400 400 214 210 ug/L EPA 8260B 12/30/04 635 54 5 153 70-130 25 Toluene 41678-01 54 400 400 438 436 ug/L EPA 8260B 12/30/04 960 956 0 456 70-130 25 Tert-Butanol 41678-01 <50 200 200 197 192 ug/L EPA 8260B 12/30/04 98 3 959 2 53 70-130 25 Methyl-t-Butyl Ether41678-01 14 400 400 576 547 ug/L EPA 8260B 12/30/04 110 103 6 68 70-130 25 Benzene 41772-03 14 400 400 544 535 ug1L EPA 8260B 113105 102 993 233 70-130 25 Toluene 41772-03 10 400 400 503 50 2 ug/L EPA 82606 113105 100 998 0200 70-130 25 Tert-Butanol 41772-03 <5 0 200 200 202 199 ug1L EPA 8260B 113105 101 99 5 1 37 70-130 25 Methyl-t-Butyl Ether41772-03 <0 50 400 400 381 39 6 ug/L EPA 82606 113105 95 3 990 390 70-130 25 Benzene 4177208 <0 50 400 400 390 377 ug/L EPA 8260B 12/30/04 976 942 349 70-130 25 Toluene 41772-08 <0 50 400 400 38 7 376 ug/L EPA 8260B 12/30/04 969 939 306 70-130 25 Tert-Butanol 41772-08 <5 0 200 200 199 207 ug/L EPA 8260B 12/30/04 993 104 433 70-130 25 Methyl-t-Butyl Ether41772-08 <0 50 400 400 39 2 38 9 ug1L EPA 8260B 12/30/04 980 972 0 781 70-130 25 4 Approved By Jo iff KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800