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QC Report: Matrix Spike/Matrix Spike Duplicate Report Number-. 43517 Date ., 5/12/2005 Project Name : Sanchez Property Project Number I i Duplicate Duplicate Spiked Spike Spiked Spiked Spiked Spiked Sample Relative Spiked Sample Spike Dup. Sample Sample Analysis Sample Sample Relative Percent Percent Parameter Sam le Date p Value Level Level Value Value Units Method Analyzed Recount Percent Percent Recov. Diff. Benzene 43670-01 <0.50 38.2 37.0 38.6 37.4 ug/L EPA 82606 5110Y Recov. Diff. Limit Limit 70-130 25 Toluene 43670-01 <0.50 38.2 37.0 40.2 38.6 ug/L EPA 82608 5110105 105 104 1.23101 0.110 70-130 25 Tert-Butanol 43670-01 <5.0 191 185 187 190 ug/L EPA 8260E 5110105 98.0 103 4.78 70-130 25 Methyl-t-Butyl Ether 43670-D1 <0.50 38.2 37.0 37.0 34.2 ug/L EPA 8260E 5110105 97.0 92.4 4.82 70-130 25 I Benzene 43510-05 <0.50 40.0 40.0 36.7 36.1 ug/L EPA 8260E 5/2105 91.7 90.2 1.62 70-130 25 Toluene 43510-05 <0.50 40.0 40.0 38.5 37.8 ug/L EPA 8260E 512105 96.3 94.5 1.86 70-130 25 Tert-Butanol 43510-05 <5.0 200 200 194 198 ug/L EPA 8260E 512/05 96.8 99.3 2.57 70-130 25 Methyl-t-Butyl Ether43510-05 <0.50 40.0 40.0 35.6 34.8 ug/L EPA 82608 512105 89.0 87.1 2.19 70-130 25 Benzene 43517-01 <0.50 40.0 40.0 37.5 36.5 ug/L EPA 8260B 512105 93.7 91.2 2.74 70-130 25 Toluene 43517-01 <0.50 40.0 40.0 42.7 41.1 ug/L EPA 8260B 512105 107 103 3.89 70-130 25 Tert-Butanof 43517-01 7.1 200 200 196 196 ug/L EPA 8260E 512105 94.4 94.2 0.174 70-130 25 Methyl-t-Butyl Ether 43517-01 <0.50 40.0 40.0 35.3 33.3 ug/L EPA 8260B 512105 88.2 83.4 5.69 70-130 25 1 KIFF ANALYTICAL, LLC Approved By: Joipff 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 i I