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Report Number 20422 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 6/8/2001 , <br /> Project Name 3725 Tracy Boulevard, <br /> Project Number 243-0813 <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 20421-01 <0 50 248 24 8 244 254 ug/L EPA 8260B 6/4/2001 984 102 414 70-130 25 <br /> Toluene 20421-01 <0 50 248 248 232 23 9 ug/L EPA 8260B 6/4/2001 933 964 335 70-130 25 <br /> Tert-Butanol 20421-01 <5 0 248 248 263 258 uglL EPA 8260B 6/4/2001 106 104 200 70-130 25 <br /> Methyl-t-Butyl Ether 20421-01 41 248 248 286 30 1 ug/L EPA 8260E 6/412001 98 8 104 566 70-130 25 <br /> I <br /> Approved By J 1 Kiff <br /> KIFF ANALYTICAL LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />