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Report Number: 30531 <br /> 4C Report : Matrix Spike/ Matrix Spike Duplicate Date : 12-/27/2002 <br /> i <br /> Project Name : 341: East Main Street, <br /> Project Number: 021219-JB2 <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. W. <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov. Recov. Diff. Limit Limit <br /> Benzene 30531-01 <0.50 40.0 40.0 40.8 39.4 ug/L EPA 8260B 12/23/02 102 98.5 3.39 70-130 25 <br /> Toluene 30531-01 <0.50 40.0 40.0 39.9 38.4 ug/L EPA 8260B 12/23/02 99.8 95.9 3.98 70-130 25 <br /> Tert-Butanol 30531-01 <5.0 200 200 200 202 ug/L EPA 82608 12/23/02 99. 9 101 1.20 70-130 25 <br /> Methyl-t-Butyl Ether30531-01 <0.50 40.0 40.0 39.9 39.4 ug/L EPA 8260B 12/23/02 99.7 98.6 1.13 70-130 25 i <br /> Approved By: J I KW <br /> KIFIr ANICAL, LLC <br /> 2795 2nd St, Suite 300 vis, CA 95616 530-2974800 <br />