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i <br /> Report Number 20716 <br /> QC Report Matrix Spike] Matrix Spike Duplicate Date 6/27/2001 <br /> Project Name 2494 East Freemont <br /> Protect Number 243-0797 <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 Analyze Recov Recov Diff Limit Limit <br /> Spike Recovery Data <br /> Benzene 20715-05 210 244 242 223 230 ug/L EPA 8260B 61231200152 5 823 44 2 70-130 25 <br /> Toluene 20715-05 34 244 242 241 23 7 ug/L EPA 8260B 61231200184 7 836 1 32 70-130 25 <br /> Tert-Butanol 20715-05 35 244 242 571 590 ug/L EPA 8260B 61231200190 8 99 3 8 96 70-130 25 <br /> Methyl-t-Butyl Ether 20715-05 <0 50 244 242 226 224 ug/L EPA 8260E 61231200192 4 926 0 216 70-130 25 <br /> I <br /> i <br /> i <br /> Approved By J I Kiff qi <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />