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Report Number: 21613 <br /> QC Report : Matrix Spike/ Matrix Spike Duplicate Date : 8/23/2001 <br /> Project Name : 880 Victor, Lodi <br /> Project Number : 010802-K2 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sampie 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 21609-03 <0.50 19.9 18.7 19.3 20.2 ug/L EPA 8260B 8/8/2001 97.2 108 10.7 70-130 25 <br /> Toluene 21609-03 <0.50 19.9 18.7 19.5 20.4 ug/L EPA 8260B 8/8/2001 98.0 109 10.5 70-130 25 <br /> Tert-Butanol 21609-03 12 99.3 93.4 169 164 ug/L EPA 8260B 8/8/2001 158 163 3.21 70-130 25 <br /> Methyl-t-Butyl Ether 21609-03 950 19.9 18.7 602 572 ug/L EPA 8260B 8/8/2001 0.00 0.00 0.00 70-130 25 <br /> I <br /> Approved By: J el Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />