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Report Number: 542 QC Report : Matrix Spike/ Matrix Spike Duplicate Date : 10/1812004 Project Name : Beacon 3641 Project Number : 1641.18 Duplicate Spiked Spikecdate Spiked Relative Spike Spiked Spiked Sample Sample Relative Percent Percent Spiked Sample Spike Dup. Sample Sample Analysis Date Percent Percent Percent Recov. Diff. Parameter Sample Value Level Level Value Value Units Method Analyzed Recov. Recov. Diff. Limit Limit Benzene 40541-14 <0.0050 0.0388 0.0394 0.0348 0.0362 mg/Kg EPA 82606 10/13/04 89.8 92.0 2.37 70-130 25 Toluene 40541-14 <0.0050 0.0388 0.0394 0.0358 0.0375 mg/Kg EPA 8260B 1011310 92.4 95.2 2.95 70-130 25 Tert-Butanol 40541-14 <0.0050 0.194 0.197 0.178 0.186 mg/Kg EPA 8260E 10/13/04 91.9 94.4 2.70 70-130 25 Methyl-t-Butyl Ether40541-14 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 Benzene 40469-05 <0.0050 0.0396 0.0391 0.0381 0.0376 mg/Kg EPA 8260B 10/14/04 96.3 96.2 0.0855 70-130 25 Toluene 40469-05 <0.0050 0.0396 0.0391 0.0369 0.0359 mg/Kg EPA 8260B 10/14/04 93.1 91.8 1.42 70-130 25 Tert-Butanol 40469-05 <0.0050 0.198 0.195 0.170 0.171 mg/Kg EPA 8260B 10/14/04 86.1 87.6 1.66 70-130 25 Methyl-t-Butyl Ether 40469-05 <0.0050 0.0396 0.0391 0.0339 0.0344 mg/Kg EPA 8260B 10/14/04 85.6 88.1 2.90 70-130 25 Benzene 40542-25 <0.0050 0.0366 0.0364 0.0301 0.0305 mg/Kg EPA 8260B 10/16/04 82.1 83.9 2.14 70-130 25 Toluene 40542-25 <0.0050 0.0366 0.0364 0.0321 0.0323 mg/Kg EPA 8260B 10/16104 87.6 88.8 1.38 70-130 25 Tert-Butanol 40542-25 <0.0050 0.183 0.182 0.147 0.153 mg/Kg EPA 82608 10/16/04 80.2 84.0 4.61 70-130 25 Methyl-t-Butyl Ether 40542-25 0.0050 0.0366 0.0364 0.0327 0.0325 mg/Kg EPA 8260B 10/16/04 89.2 89.5 0.388 70-130 25 KIFF ANALYTICAL, LLC Approved By: ,toe iff 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800