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Report Number : 40543 <br /> QC Report : Matrix Spike/ Matrix Spike Duplicate Date '. 10/19/2004 <br /> Project Name : Beacon 3641 <br /> Project Number: 1641.18 <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 40541-14 <0.0050 0.0388 0.0394 0.0348 0.0362 mg/Kg EPA 8260B 10/13/04 89.8 92.0 2.37 70-130 25 <br /> Toluene 40541-14 <0.0050 0.0388 0.0394 0.0358 0.0375 mg/Kg EPA 8260B 10/13/04 92.4 95.2 2.95 70-130 25 <br /> Tert-Butanol 40541-14 <0.0050 0.194 0.197 0.178 0.186 mg/Kg EPA 8260B 10/13/04 91.9 94.4 2.70 70-130 25 <br /> Methyl-t-Butyl Ether 40541-14 0.13 0.0388 0.0394 0.154 0.134 mg/Kg EPA 8260B 10/13/04 68.6 17.0 121 70-130 25 <br /> Benzene 40561-18 <0A050 0.0399 0.0398 0.0389 0.0381 mg/Kg EPA 8260B 10/18/04 97.4 95.6 1.81 70-130 25 <br /> Toluene 40561-18 <0.0050 0.0399 0.0398 0.0377 0.0369 mg/Kg EPA 8260B 10/18/04 94.4 92.7 1.90 70-130 25 <br /> Tert-Butanol 40561-18 <0.0050 0.200 0.199 0.185 0.175 mg/Kg EPA 8260B 10/18/04 92.5 87.8 5.22 70-130 25 <br /> Methyl-t-Butyl Ether 40561-18 <0.0050 0.0399 0.0398 0.0377 0.0394 mg/Kg EPA 8260B 10/18/04 94.5 98.9 4.60 70-130 25 <br /> Approved By: Jo iff <br /> KIFFAN_ ;'TICAL, LLC <br /> 'S <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />