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• i • Report Number 43568 QC Report Matrix Spike/Matrix Spike Duplicate Date 5/10/2005 Project Name 7-Eleven Store#17334 Project Number 77EL 17334 45 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 43580-03 13 400 400 578 57 3 ug1L EPA 8260E 515/05 111 109 1 28 70-130 25 Toluene 43580-03 1 5 400 400 41 7 425 uglL EPA 8260B 515105 100 102 1 93 70-130 25 Tert-Butanol 43580-03 11 200 200 220 240 ug/L EPA 8260B 515105 105 115 902 70-130 25 Methyl-t-Butyl Ether43580-03 35 400 400 740 766 ug/L EPA 8260B 515105 96 3 103 667 70-130 25 Benzene 43559-07 <0 50 400 400 387 375 ug/L EPA 8260B 515105 968 938 312 70-130 25 Toluene 43559-07 1 1 400 400 41 6 401 ug/L EPA 82606 515105 101 975 392 70-130 25 Tert-Butanol 43559-07 <50 200 200 182 192 ug/L EPA 8260B 515105 91 2 960 517 70-130 25 Methyl-t-Butyl Ether 43559-07 <0 50 400 400 396 404 ug/L EPA 82606 515105 99 1 101 205 70-130 25 Benzene 43584-02 <0 50 400 400 402 388 ug/L EPA 8260B 515105 100 971 329 70-130 25 Toluene 43584-02 <0 50 400 400 409 391 ug/L EPA 8260B 515105 102 977 4 51 70-130 25 Tert-Butanol 43584-02 <5 0 200 200 200 199 ug/L EPA 8260B 515105 99 8 993 0 500 70-130 25 Methyl-t-Butyl Ether43584-02 0 69 400 400 384 371 ug/L EPA 8260B 515105 943 909 363 70-130 25 Benzene 43601-10 0 90 400 400 38 9 373 ug/L EPA 8260B 516105 950 91 0 4 30 70-130 25 Toluene 43601-10 2 7 400 400 425 406 ug/L EPA 82606 516!05 99 5 949 4 71 70-130 25 Tert-Butanol 43601-10 2000 200 200 2260 2170 ug/L EPA 8260B 516105 115 725 455 70-130 25 Methyl-t-Butyl Ether 43601-10 140 400 400 182 182 ug/L EPA 82606 516105 107 106 0 663 70-130 25 Approved By Jo iff KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800