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i <br /> Report Number 39243 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 7/23/2004 <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 /> Tert-Butanol 39288-03 <5 0 200 200 194 192 uglL EPA 8260B 7122104 970 958 127 70-130 25 <br /> Methyl-t-Butyl Ether 39288-03 <0 50 4 00 4 00 335 352 uglL EPA 82606 7122104 836 880 509 70-130 25 <br /> Benzene 39288-07 <0 50 400 400 39 5 374 uglL EPA 8260B 7!22104 988 935 543 70-130 25 <br /> Toluene 39268-07 <0 50 400 400 314 308 uglL EPA 8260E 7122104 78 4 769 192 70-130 25 <br /> Tert-Butanol 39288-07 <5 0 200 200 211 214 uglL EPA 8260B 7122104 106 107 120 70-130 25 <br /> Methyl-t-Butyl Ether 39288-07 <0 50 400 400 438 421 uglL EPA 8260B 7/22104 110 105 395 70-130 25 <br /> Benzene 39257-01 <0 50 400 400 426 403 uglL EPA 82606 7119104 106 101 559 70-130 25 <br /> Toluene 39257-01 <0 50 400 400 38 6 36 7 uglL EPA 8260E 7119104 966 918 501 70-130 25 <br /> Tert-Butanol 39257-01 <5 0 200 200 185 190 uglL EPA 8260B 7119104 926 950 256 70-130 25 <br /> Methyl-t-Butyl Ether 39257-01 <0 50 400 400 35 5 354 uglL EPA 8260B 7119104 889 884 0 506 70-130 25 <br /> Approved By Jo iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />