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Report Number 41548 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 12/1712004 <br /> Project Name HANSEN <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 /> Tert-Butanol 41468-01 <5 0 200 200 195 192 ug/L EPA 8260B 12/16/04 976 961 156 70-130 25 <br /> Methyl-t-Butyl Ether41468-01 <0 50 400 400 390 388 ug/L EPA 8260B 12/16/04 976 971 0 493 70-130 25 <br /> I <br /> Approved By .!o iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St Suite 300 Davis,CA 95616 530-2974800 <br />