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Report Number 37754 <br /> QC Report Matrix Spike/ Matrix Spike Duplicate Date 4/2/2004 <br /> Project Name COX + COX - 595 E, 11th <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 37738-01 <0 0050 00400 00399 00358 00362 mg/Kg EPA 8260B 411!04 696 908 140 70-130 25 <br /> Toluene 37738-01 <0 0050 00400 00399 00350 00350 mg/Kg EPA 8260B 4!1104 875 876 0 150 70-130 25 <br /> Tert-Butanol 37738-01 <0 0050 0200 0200 0 173 0 172 mg/Kg EPA 8260B 411104 863 862 0 108 70-130 25 <br /> Methyl-t-Butyl Ether 37738-01 <0 0050 00400 00399 00362 00366 mg/Kg EPA 8260B 411104 906 916 106 70-130 25 <br /> Approved By 'Jetail�'''rf <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 a� <br />