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Report Number: 23120 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date : 1111312001 <br /> Project Name : Singh's Unocal <br /> Project Number: 3254 <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 23123-01 <0.50 40.0 40.0 39.0 39.0 ug/L EPA 8260B 1112/200197.5 97.4 0.102 70-130 25 <br /> Toluene 23123-01 <0.50 40.0 40.0 39.5 39.5 ug/L EPA 8260B 11121200198.8 98.8 0.101 70-130 25 <br /> Ter#-Butanol 23123-01 <5.0 200 200 187 195 ug/L EPA 8260E 11121200193.4 97.4 4.23 70-130 25 <br /> Methyl-t-Butyl Ether 23123-01 1.4 40.0 40.0 41.6 41.7 ug/L EPA 8260B 111212001100 101 0.199 70-130 25 <br /> Approved By: Jbel Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br /> i <br />