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Report Number 31000 <br /> QC Report Matrix Spike/ Matrix Spike Duplicate Date 1/21/2003 <br /> Project Name WILSON <br /> Project Number 3490 <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 31000-02 <0 50 400 400 422 406 ug/L EPA 8260B 1/20103 105 101 384 70-130 25 <br /> Toluene 31000-02 <0 50 400 400 415 397 ug/L EPA 82608 1120/03 104 993 443 70-130 25 <br /> Tert-Butanol 31000-02 <5 0 200 200 213 215 ug/L EPA 8260B 1/20/03 106 108 1 07 70-130 25 <br /> Methyl-t-Butyl Ether 31000-02 <0 50 400 400 422 424 ug/L EPA 8260B 1/20/03 106 106 0 378 70-130 25 <br /> I <br /> Approved By J6pl Koff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />