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Report Number 20750 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 6/28/2001 <br /> Project Name 2494 East Freemont <br /> Project Number 243-0797 <br /> I <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 20793-01 <0 50 246 245 24 2 243 ug/L EPA 82606 61231200198 5 990 0 486 70-130 25 <br /> Toluene 20793-01 <0 50 246 245 241 241 ug/L EPA 8260B 61231200198 2 98 1 00611 70-130 25 <br /> Tert-Butanol 20793-01 <5 0 246 245 286 281 ug/L EPA 8260E 612312001116 114 177 70-130 25 <br /> Methyl-t-Butyl Ether 20793-01 84 246 245 335 340 ug/L EPA 82606 612312001102 104 237 70-130 25 <br /> I <br /> I <br /> Approved By J I Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br /> i I <br />