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Report Number'. 35917 <br /> QC Report: Matrix Spike/Matrix Spike Duplicate Date : 12/3/2003 <br /> Project Name : USA GAS STATION <br /> Project Number: D003-004-1 <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 35918-01 <0.0050 0.0394 0.0394 0.0423 0.0419 mg/Kg EPA 8260B 11/25/03 107 106 0.865 70-130 25 <br /> Toluene 35918-01 <0.0050 0.0394 0.0394 0.0417 0.0411 mg/Kg EPA 8260B 11/25/03 106 104 1.40 70-130 25 <br /> Tert-Butanol 35918-01 <0.0050 0.197 0.197 0.196 0.210 mg/Kg EPA 8260B 11/25/03 99.6 107 7.09 70-130 25 <br /> Methyl-t-Butyl Ether 35918-01 <0.0050 0.0394 0.0394 0.0387 0.0383 mg/Kg EPA 82606 11/25/03 98.2 97.2 1.02 70-130 25 <br /> I <br /> Approved By: J t#befil <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St;Suite 300 Davis, CA 95616 530-297-4800 <br />