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Report Number: 43342 <br /> QC Report : Matrix Spike] Matrix Spike Duplicate Date : 4/2612005 <br /> Project Name : Sanchez Property <br /> Project Number: <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike Dup. Sample Sample Analysis Date Percent Percent Percent Recov. Diff. <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov. Recov. Diff. Limit Limit <br /> Benzene 43352-01 <0.50 40.0 40.0 42.5 41.1 ug/L EPA 8260B 4121105 106 103 3.22 70-130 25 <br /> Toluene 43352-01 1.1 40.0 40.0 38.7 37.3 ug/L EPA 8260E 4/21105 94.0 90.6 3.69 70-130 25 <br /> Tert-Butanol 43352-01 <5.0 200 200 212 197 ug/L EPA 8260B 4/21105 106 98.6 7.28 70-130 25 <br /> Methyl-t-Butyl Ether 43352-01 <0.50 40.0 40.0 33.4 34.0 ug/L EPA 8260B 4121105 83.5 85.0 1.79 70-130 25 <br /> Benzene 43342-06 64 40.0 40.0 108 107 ug/L EPA 8260E 4122105 111 108 2.56 70-130 25 <br /> Toluene 43342-06 3.6 40.0 40.0 43.5 43.4 ug/L EPA 8260E 4122/05 99.8 99.5 0.224 70-130 25 <br /> Tert-Butanol 43342-06 10 200 200 213 206 ug/L EPA 8260B 4122105 102 97.9 3.68 70-130 25 <br /> Methyl-t-Butyl Ether 43342-06 29 40.0 40.0 65.7 66.1 ug/L. EPA 8260E 4122105 91.9 93.0 1.17 70-130 25 <br /> Benzene 43342-08 <0.50 40.0 40.0 37.4 36.5 ug/L EPA 8260B 4123105 93.4 91.4 2.20 70-130 25 <br /> Toluene 43342.08 <0.50 40.0 40.0 37.8 37.2 ug/L. EPA 8260E 4/23105 94.6 93.0 1.60 70-130 25 <br /> Tert-Butanol 43342-08 <5.0 200 200 197 197 ug/L EPA 82608 4123105 98.4 98.7 0.344 70-130 25 <br /> Methyl-t-Butyl Ether 43342-08 <0.50 40.0 40.0 37.0 36.7 ug/L EPA 8260E 4123105 92.5 91.8 0.799 70-130 25 <br /> Benzene 43342-12 <0.50 40.0 40.0 42.3 41.8 ug/L EPA 8260B 4122105 106 104 1.23 70-130 25 <br /> Toluene 43342-12 <0.50 40.0 40.0 42.3 41.8 ug/L EPA 82608 4122/05 106 104 1.36 70-130 25 <br /> Tert-Butanol 43342-12 <5.0 200 200 209 204 ug/L EPA 8260B 4122105 104 102 2.28 70-130 25 <br /> Methyl-t-Butyl Ether43342-12 <0.50 40.0 40.0 431 43.0 ug/L EPA 8260B 4122105 108 107 0.277 70-130 25 <br /> Benzene 43355-19 <0.50 40.0 40.0 41.2 40.1 ug/L EPA 8260B 4123105 103 100 2.78 70-130 25 <br /> Toluene 43355-19 <0.50 40.0 40.0 41.6 40.7 ug/L EPA 82606 4123105 104 102 2.16 70-130 25 <br /> Approved By: Jo iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />