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Report Number: 33431 <br /> QC Report: Matrix Spike/Matrix Spike Duplicate Date : 06/03/2003 <br /> Project Name : 7-Eleven Store #32262 <br /> Project Number: 77EL.32262.43 <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 33411-03 54 39.9 39.8 94.6 94.2 ug/L EPA 8260B 6/3/03 100 99.8 0.645 70-130 25 <br /> Toluene 33411-03 5.0 39.9 39.8 46.1 45.4 ug/L EPA 82608 6/3/03 103 102 1.29 70-130 25 <br /> Tert-Butanol 33411-03 <5.0 200 199 205 195 ug/L EPA 82608 6/3/03 103 98.1 4.51 70-130 25 <br /> Methyl-t-Butyl Ether 33411-03 <0.50 39.9 39.8 39.2 40.6 ug/L EPA 8260B 6/3/03 98.3 102 3.82 70-130 25 <br /> r: <br /> I Kiff <br /> Approved By: <br /> KIFF ANALYTICAL, LLC ;J¢�;, <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 �✓ <br />