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i <br /> Report Number 37298 <br /> 4C Report Matrix Spike/ Matrix Spike Duplicate Date 3/9/2004 <br /> i <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 37320-01 <0 0050 00388 00388 00377 00377 mg/Kg EPA 8260B 316104 971 971 00132 70-130 25 <br /> Toluene 37320-01 <0 0050 00388 00388 00372 00366 mg/Kg EPA 8260E 316104 959 943 1 74 70-130 25 <br /> Tert-Butanol 37320-01 <0 0050 0 194 0 194 0 180 0 183 mg/Kg EPA 8260E 316/04 92 8 941 144 70-130 25 <br /> Methyl-t-Butyl Ether 37320-01 <0 0050 00388 00388 00424 00421 mg/Kg EPA 8260B 316104 109 108 0 713 70-130 25 <br /> 4 L 4aw <br /> Approved By R P Furry <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />