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0 • Report Number : 02 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date : 8/1/2002 <br /> Project Name : 341 East Main Street, <br /> Project Number: 020723-C61 <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 27676-01 <0.50 40.0 40.0 42.5 41.8 ug/L EPA 8260B 7128102 106 104 1.64 70-130 25 <br /> Toluene 27676-01 <0.50 40.0 40.0 39.8 39.1 ug/L EPA 8260B 7/28102 99.5 97.8 1.70 70-130 25 <br /> Tert-Butanol 27676-01 <5.0 200 200 197 199 ug/L EPA 8260E 7128102 98.4 99.7 1.29 70-130 25 <br /> Methyl-t-Butyl Ether 27676-01 <0.50 40.0 40.0 41.6 40.7 ug/L EPA 8260B 7/28/02 104 102 2.26 70-130 25 <br /> i <br /> Approved By: J I Kiff <br /> NQFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />