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Report Number: 67889 <br /> QC Report : Matrix Spike/ Matrix Spike Duplicate Date : 04/15/2009 <br /> Project Name : Stockton Promenade - Edison Street <br /> Project Number: 7345.09 <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 /> Methyi-t-butyl ether 67890-01 <0.50 40.6 40.4 41.5 41.0 ug/L EPA 8260B 3/30/09 102 101 0.819 70-130 25 <br /> Tert-Butanol 67890-01 48 200 200 249 243 ug/L EPA 8260B 3/30/09 100 97.5 2.46 70-130 25 • <br /> Methyl-t-butyl ether 67898-03 <0.50 40.7 40.7 40.0 39.3 ug/L EPA 8260B 3/28/09 98.4 96.5 1.95 70-130 25 <br /> Tert-Butanol 67898-03 <5.0 201 201 203 202 ug/L EPA 8260B 3/28/09 101 100 0.329 70-130 25 <br /> Methyl-t-butyl ether 67903-14 <0.50 40.7 40.7 43.9 40.5 ug/L EPA 82606 3/30/09 108 99.5 8.07 70-130 25 <br /> Tert-Butanol 67903-14 <5.0 201 201 197 200 ug/L EPA 82608 3/30/09 97.9 99.4 1.52 70-130 25 <br /> • <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd Street, Suite 300 Davis, CA 95618 530-297-4800 <br />