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Report Number 20790 <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 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 II <br /> Benzene 20790-01 <0 50 195 190 224 188 ug/L EPA 8260B 612512001115 992 14 4 70-130 25 <br /> Toluene 20790-01 <0 50 195 190 221 186 ug/L EPA 8260B 612512001113 980 143 70-130 25 <br /> Tert-Butanol 20790-01 <5 0 976 95 0 104 92 0 ug/L EPA 8260B 612512001107 968 966 70-130 25 <br /> Methyl-t-Butyl Ether 20790-01 <0 50 195 190 241 203 ug/L EPA 8260B 612512001123 107 144 70-130 25 i <br /> Approved By J I Kiff <br />` KIFF ANALYTICAL, LLC <br /> I � <br /> • 720 Olive Drive, Suite D is, CA 95616 530-2974800 • <br /> I <br />