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Report Number 37522 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 3/18/2004 <br /> Project Name COX + COX, 595 E i 1 TH <br /> Project Number <br /> Spiked <br /> Duplicate Spiked Spiked to Sample Relative <br /> Spike Spiked Spiked Sample SampleRelative 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 37505-01 <0 0050 00397 00398 00382 00378 mg/Kg EPA 8260B 3118104 963 950 1 32 70-130 25 <br /> Toluene 37505-01 <0 0050 00397 00398 00390 00384 mg/Kg EPA 8260B 3118104 982 966 166 70-130 25 <br /> Tert-Butanol 37505-01 <0 0050 0 198 0 199 0 194 0 188 mg/Kg EPA 8260B 3118/04 976 947 303 70-130 25 <br /> Methyl-t-Butyl Ether 37505-01 <0 0050 00397 00398 00392 00387 mg/Kg EPA 8260B 3/18104 987 973 140 70-130 25 <br /> t <br /> Approved By lie <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 J <br />