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Report Number: 460 <br /> QC Report : Matrix Spike/ Matrix Spike Duplicate Date : 10/14/2005 <br /> Project Name : TESORO # 67080 <br /> Project Number: D003-007 <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 46414-03 <0.50 40.0 40.0 42.4 42,3 ug/L EPA 8260B 10/12/05 106 106 0.226 70-130 25 <br /> Toluene 46414-03 <0,50 40.0 40.0 41.9 41.4 ug/L EPA 82608 10/12/05 105 104 1.14 70-130 25 <br /> Tert-Butanol 46414-03 <5.0 200 200 193 195 ug/L EPA 8260B 10/12/05 96.7 97.5 0.778 70-130 25 <br /> Methyl-t-Butyl Ether 46414-03 92 40.0 40.0 135 135 ug/L EPA 8260E 10/12/05 108 109 0.474 70-130 25 <br /> Approved By: Joe iff <br /> KiFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />