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I Report Number : 43342 QC Report : Matrix Spike/Matrix Spike Duplicate Date : 4/26/2005 Project Name : Sanchez Property Project Number Duplicate Spiked Duplicate 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 ValueLevel Level Value Value Units Method Analyzed Recov. Recov, Diff. Limit Limit Tert-Butanol 43355-19 <5.0 T 200 200 203 205 ug/L EPA 82608 4123105 101 103 1.23 70-130 25 _ Methyl-t-Butyl Ether 43355-19 <0.50 40.0 40.0 43.1 42.8 uglL EPA 82606 4123105 108 107 0.829 70-130 25 I Benzene 43340-01 <0.50 40.0 40.0 40.5 40.0 ug1L EPA 8260E 4122105 101 99.9 1.21 70-130 25 Toluene 43340-01 <0.50 40.0 40.0 40.9 40.5 ug/L EPA 82606 4/22105 102 101 0.964 70-130 25 Tert-Butanol 43340-01 <5.0 200 200 194 193 ug/L EPA 82606 4122105 97.1 96.4 0.702 70-130 25 Methyl-t-Butyl Ether 43340-01 <0.50 40.0 40.0 37.1 37.1 ug/L EPA 8260E 4122105 92.8 92.7 0.154 70-130 25 Benzene 43364-01 <0.50 40.0 40.0 41.4 40.0 ug/L EPA 8260E 4/22105 103 100 3.44 70-130 25 Toluene 43364-01 1.2 40.0 40.0 42.8 41.5 ug/L EPA 8260B 4122105 104 101 3.21 70-130 25 Tert-Butanol 43364-01 <5.0 200 200 192 193 ug/L EPA 8260B 4/22105 96.3 96.7 0.457 70-130 25 Methyl-t-Butyl Ether 43364-01 <0.50 40.0 40.0 38,6 38.3 ug1L EPA 8260B 4122105 96.6 95.7 1.00 70-130 25 I I i Approved By: Jo iff KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800