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Report Number 46539 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 10/21/2005 <br /> Project Name Sanchez Property <br /> Project Number <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 46539-01 <0 50 400 400 379 374 ug/L EPA 8260E 10/21/05 948 936 123 70-130 25 <br /> Toluene 46539-01 <0 50 400 400 344 341 ug/L EPA 82608 10/21/05 86 0 85 2 0 917 70-130 25 <br /> Tert-Butanol 46539-01 <5 0 200 200 215 214 uglL EPA 8260E 10/21/05 108 107 0 508 70-130 25 <br /> Methyl-t-Butyl Ether46539-01 <0 50 400 400 352 352 ug/L EPA 8260B 10/21/05 880 881 0 147 70-130 25 <br /> I <br /> I <br /> I <br /> 4 <br /> r <br /> KIFF ANALYTICAL, LLC Approved By Joe Iff <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />