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r • Report Number : 430 QC Report : Matrix Spike/ Matrix Spike Duplicate Date : 5/12/2005 Project Name : Tesoro 67080 Project Number : D003-007 Duplicate Spiked Spikledate 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 43694-05 <0.50 40.0 40.0 40.2 39.5 ug/L EPA 8260B 5111105 100 98.6 1,81 70-130 25 Toluene 4369405 0.52 40.0 40.0 37.8 38.0 ug/L EPA 8260B 5111/05 93.2 93.8 0.610 70-130 25 Tert-Butanol 43694-05 170 200 200 375 375 ug/L EPA 82606 5111105 103 103 0.136 70-130 25 Methyl-t-Butyl Ether 43694-05 5.1 40.0 40.0 44.0 44.8 ug/L EPA 8260B 5111105 97.1 99.3 2.20 70-130 25 Benzene 43676-01 <0.50 40.0 40.0 42.4 42.3 ug/L EPA 8260E 5110105 106 106 0.217 70-130 25 Toluene 43676-01 <0.50 40.0 40.0 41.0 40.8 ug/L EPA 8260B 5110105 102 102 0,604 70-130 25 Tert-Butanol 43676-01 <5.0 200 200 203 204 ug/L EPA 8260B 5110105 101 102 0.550 70-130 25 Methyl-t-Butyl Ether 43676-01 21 40.0 40.0 61.6 61.2 ug/L EPA 82608 5110105 100 99.2 0.996 70-130 25 Benzene 43676-03 <0.50 40.0 40.0 40.8 40.5 ug/L EPA 8260B 5110105 102 101 0.689 70-130 25 Toluene 43676-03 <0.50 40.0 40.0 40.8 40.6 ug/L EPA 8260B 5110105 102 102 0.486 70-130 25 Tert-Butanol 43676-03 <5.0 200 200 193 196 ug/L EPA 8260E 5110105 96,3 97.8 1.53 70-130 25 Methyl-t-Butyl Ether43676-03 <0.50 40.0 40.0 37.3 37.5 ug/L EPA 8260B 5/10/05 93.2 93.7 0.509 70-130 25 i Approved By: joe iff KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800