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Report Number 47604 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 12/2812005 <br /> . <br /> Project Name Cohn Property <br /> Project Number COH01 001 <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 47659-01 <0 50 400 400 416 409 ug/L EPA 8260B 12/27/05 104 102 158 70-130 25 <br /> Toluene 47659-01 <0 50 400 400 411 401 ug/L EPA 8260B 12/27/05 103 100 247 70-130 25 <br /> Tert-Butanol 47659-01 <5 0 200 200 202 207 ug/L EPA 8260B 12/27/05 101 104 2 71 70-130 25 <br /> Methyl-t-Butyl Ether47659-01 <0 50 400 400 416 41 5 ug/L EPA 82606 12/27/05 104 104 0209 70-130 25 <br /> i <br /> KIFF ANALYTICAL, LLC Approved By Jo iff <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />