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i0 Report Number 20 <br /> I <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 5/21/2002 <br /> Project Name 7910 Lower Sacramento <br /> Project Number 020516-EB-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 Anal ed Recov Recov Diff Limit Limit <br /> Benzene 26433-05 <0 50 400 400 392 38 9 ug/L EPA 82608 5118102 981 973 0 844 70-130 25 <br /> Toluene 26433-05 <0 50 400 400 383 379 ug/L EPA 8260B 5118/02 958 94 8 102 70-130 25 <br /> Tert-Butanol 26433-05 <5 0 200 200 192 197 ug/L EPA 8260B 5/18/02 959 985 270 70-130 25 <br /> Methyl-t-Butyl Ether 26433-05 <0 50 400 400 394 39 1 ug/L EPA 8260B 5118102 98 6 977 0 892 70-130 25 <br /> I <br /> 4d <br /> Approved By J I Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />