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Report Number : 41612 OC Report : Matrix Spike/ Matrix Spike Duplicate Date : 12/29/2004 Project Name : Beacon Project Number: 3641 Stockton 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 41632-03 <0.50 38.2 39.3 36.8 35.9 ug/L EPA 8260B 12/27104 96.2 91.3 5.22 70-130 25 Toluene 41632-03 <0.50 38.2 39.3 36.0 35.3 ug1L EPA 8260B 12/27/04 94.2 89.8 4.85 70-130 25 Tert-Butanol 41632-03 <5.0 191 196 186 200 ug/L EPA 8260B 12/27/04 97.2 102 4.68 70-130 25 Methyl-t-Butyl Ether 41632-03 <0.50 38.2 39.3 39.0 38.7 ug/L EPA 82608 12/27/04 102 98.6 3.35 70-130 25 Benzene 41629-01 <0.50 40.0 40.0 40.5 39.3 ug/L EPA 82606 12/22/04 101 98.2 2.98 70-130 25 Toluene 41629-01 <0.50 40.0 40.0 39.8 36.4 ug/L EPA 8260E 12/22/04 99.6 91.1 8.88 70-130 25 Tert-Butanol 41629-01 <5.0 200 200 198 191 ug/L EPA 8260B 12/22/04 99.1 95.5 3.70 70-130 25 Methyl-t-Butyl Ether 41629-01 <0.50 40.0 40.0 40.5 39.9 ug/L EPA 8260B 12/22/04 101 99.8 1.45 70-130 25 Benzene 41647-10 <0.50 40.0 40.0 38.9 37.5 ug/L EPA 8260B 12/28/04 97.3 93.7 3.79 70-130 25 Toluene 41647-10 <0.50 40.0 40.0 41.0 39.6 ug/L EPA 8260B 12/28/04 103 99.0 3.63 70-130 25 Tert-Butanol 41647-10 <5.0 200 200 203 204 ug/L EPA 8260B 12/28/04 102 102 0.137 70-130 25 Methyl-t-Butyl Ether 41647-10 1.5 40.0 40.0 35.8 35.3 ug/L EPA 8260B 12/28/04 85.6 84.5 1.34 70-130 25 KIFF ANALYTICAL, LLC Approved By: Jo iff 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800