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Report Number'. 28230 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date : 9/8/2002 <br /> Project Name : NEWKIRK <br /> Project Number : 3490 <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 28244-06 <0.50 40.0 40.0 40.3 39.9 ug/L EPA 8260B 9!5102 101 99.7 1.02 70-130 25 <br /> Toluene 28244-06 <0.50 40.0 40.0 40.8 40.2 ug/L EPA 82606 915102 102 100 1.31 70-130 25 <br /> Tert-Butanol 28244-06 <5.0 200 200 196 196 ug/L EPA 8260E 915102 98.0 98.1 0.132 70-130 25 <br /> Methyl-t-Butyl Ether 28244-06 0.78 40.0 40.0 40.5 40.4 ug/L EPA 82608 915102 99.4 99.1 0.302 70-130 25 <br /> I <br /> Approved By: Joel Kiff <br /> KIFF ANALYTICAL, LLC i <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />