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Report Number : 36221 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date : 12/18/2003 <br /> Project Name : USA PETROLEUM <br /> Project Number : D003-006-1 <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 36221-01 <0.0050 0.0379 0.0382 0.0346 0.0340 mg/Kg EPA 8260B 12/13/03 91.2 89.1 2.36 70-130 25 <br /> Toluene 36221-01 <0.0050 0.0379 0.0382 0.0344 0.0336 mg/Kg EPA 8260B 12/13/03 90.8 88.2 2.93 70-130 25 <br /> Tert-Butanol 36221-01 <0.0050 0.189 0.191 0.167 0.158 mg/Kg EPA 8260B 12/13/03 88.4 82.6 6.76 70-130 25 <br /> Methyl-t-Butyl Ether 36221-01 <0.0050 0.0379 0.0382 0.0342 0.0344 mg/Kg EPA 8260B 12/13/03 90.4 90.0 0.416 70-130 25 <br /> Approved By: R P Furry_) <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />