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Report Number : 41`493 QC Report : Matrix Spike/Matrix Spike Duplicate Date : 12/29/2004 Project Name : Beacon 3641 Project Number: 1641.18 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 41493-01 <0.50 39.6 40.0 37.8 40.7 ug/L EPA 8260B 12/17/04 95.4 102 6.47 70-130 25 Toluene 41493-01 39 39.6 40.0 66.1 71.4 ug/L EPA 8260B 12/17/04 68.4 80.9 16.8 70-130 25 Tert-Butanol 41493-01 <5.0 198 200 172 189 ug/L EPA 8260B 12/17/04 86.6 94.7 8.89 70-1.30 25 Methyl-t-Butyl Ether41493-01 <10.50 39.6 40.0 35.7 37.4 ug/L EPA 8260B 12117/04 90.1 93.6 3.86 70-130 25 Benzene 41497-06 1.4 40.0 40.0 41.6 40.6 ug/L EPA 8260B 12/18/04 100 98.0 2.43 70-130 25 Toluene 41497-06 6.0 40.0 40.0 45.1 43.4 ug/L EPA 8260B 12/18104 97.9 93.6 4.46 70-130 25 Tert-Butanol 41497-06 <5.0 200 200 204 197 ug/L EPA 826013 12/18/04 102 98.6 3.49 70-130 25 Methyl-t-Butyl Ether 41497-06 <0.50 40.0 40.0 41.3 41.0 ug/L EPA 8260B 12/18/04 103 102 0.694 70-130 25 Benzene 41570-01 <0.50 40.0 40.0 37.9 36.3 ug/L EPA 82608 12/21/04 94.7 90.7 4.31 70-130 25 Toluene 41570-01 <0.50 40,0 40.0 39.5 38.1 ug1L EPA 82608 12/21/04 98.8 95.2 3.71 70-130 25 Tert-Butanol 41570-01 <5.0 200 200 195 196 ug/L EPA 8260B 12/21104 97.4 98.2 0.814 70-130 25 Methyl-t-Butyl Ether 41570-01 <0.50 40.0 40.0 32.4 31.8 ug/L EPA 8260B 12/21104 80.9 79.6 1.68 70-130 25 I Approved By: ,toe iff KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800