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0 Report Number 24 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 2/28/2002 <br /> Project Name 2494 Fremont Street, <br /> Project Number 020218-KF-1 <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 /> Benzene 24839-10 23 200 19 8 220 21 5 ug/L EPA 82608 21241200298 6 972 140 70-130 25 <br /> Toluene 24839-10 <0 50 200 198 200 195 ug/L EPA 8260B 21241200299 8 984 139 70-130 25 <br /> Tert-Butanol 24839-10 <5 0 100 989 912 935 ug/L EPA 82608 21241200291 0 94 6 382 70-130 25 <br /> Methyl-t-Butyl Ether 24839-10 8 4 200 198 293 294 ug/L EPA 8260B 2124/2002104 106 164 70-130 25 <br /> I <br /> Approved By JI Kiff <br /> KIFF ANALYTICAL, LLC 0 <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />