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Report Number: 31764 <br /> QC Report : Matrix Spike/!Matrix Spike Duplicate Date : 3/17/2003 <br /> Project Name : 341 East Main Street, <br /> Project Number: 030224-MSI <br /> Duplicate ;Spiked Spiked to 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 /> n <br /> Benzene 31767-01 X0.50 40.0 40.0 38.6 36.9 ug/L EPA 8260E 311103 96.5 92.4 4.42 70-130 25 <br /> Toluene 31767-01 <0.50 40.0 40.0 36.9 35.2 ug/L EPA 82608 311103 X92.2 87.9 4.80 70-130 25 <br /> Tert-Butanol 31767-01 <5.0 200 200 192 190 ug/L EPA 82608 311103 '96. 1 94.9 1.22 70-130 25 <br /> Methyl-t-Butyl Ether 31767-01 <0.50 40.0 40.0 36.8 35.4 ug/L EPA 82608 311103 '92.0 88.4 4.07 70-130 25 <br /> I ' <br /> i <br /> _ Approved By: J 1 Kiff <br /> KIFF ANA ICAL, LLC _ <br /> 2795 2nd St, Suite 300is, CA 95616 530-297-4800 <br />