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i <br /> Report Number: 20283 <br /> QC Report : Matrix Spike/Matrix .Spike Duplicate Date : 6/19/2001 <br /> Project Name : 341 East MainStreet, <br /> Project Number: 243=0324 <br /> I <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 /> Spike Recovery Data <br /> Benzene 20283-01 <0.50 23.9 23.9 24.1 24.1 ug/L EPA 8260E 5/1712001101 101 0.0397 70-130 25 <br /> Toluene 20283-01 <0.50 23.9 23.9 24.1 24.5 ug/L EPA 82608 5/1712001101 102 1.48 70-130 25 <br /> Tert-Butanol 20283-01 <5.0 23.9 23.9 28.4 28.7 ug/L. EPA 82608 511712001119 120 1.04 70-130 25 <br /> Methyl-t-Butyl Ether 20283-01 <0.50 23.9 23.9 20.7 19.8 ug/L EPA 82608 5117/200186.4' 82.9 4.09 70-130 25 <br /> Approved By: J�el Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />