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Report Number . 40493 <br /> QC Report : Matrix Spike/ Matrix Spike Duplicate Date -. 10/13/2004 <br /> Project Name : Beacon 3641 <br /> Project Number : 1641.18 <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 40492-06 <0.0050 0.0386 0.0392 0.0343 0.0366 mg/Kg EPA 8260B 10/11/04 88.8 93.4 5.08 70-130 25 <br /> Toluene 40492-06 <0.0050 0.0386 0.0392 0.0325 0.0343 mg/Kg EPA 8260B 10/11/04 84.1 87.6 4.02 70-130 25 <br /> Tert-Butanol 40492-06 <0.0050 0.193 0.196 0.168 0.166 mg1Kg I=PA 8260B 10/11104 87.1 84.4 3.07 70-130 25 <br /> Methyl-t-Butyl Ether 40492-06 <0.0050 0.0386 0.0392 0.0338 0.0323 mg/Kg EPA 8260B 10/11/04 87.6 82.4 6.13 70-130 25 <br /> I <br /> KIFF ANALYTICAL, LLC Approved By: Joe iff <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />