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Report Number: 41504 QC Report : Matrix Spike/ Matrix Spike Duplicate Date : 12/22/2004 Project Name : 7910 Lower Sacramento Project Number : 206-0832-002 Duplicate Spiked Duplicate Spiked Spiked Sample 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 TPH as Diesel 41504-10 <1.0 20.0 20.0 23.8 23.1 mg/Kg M EPA 8015 12121/04 119 116 2.84 60-140 25 Benzene 41440-12 <0.0050 0.0384 0.0372 0.0348 0.0346 mg/Kg EPA 8260E 12/14/04 90.7 93.0 2.52 70-130 25 Toluene 41440-12 <0.0050 0.0384 0.0372 0.0344 0.0342 mg/Kg EPA 8260E 12/14/04 89.5 91.9 2.65 70-130 25 Tert-Butanol 41440-12 <0.0050 0.192 0.186 0.186 0.176 mg/Kg EPA 8260E 12/14/04 96.8 94.7 2.21 70-130 25 Methyl-t-Butyl Ether 41440-12 <0.0050 0.0384 0.0372 0.0356 0.0344 mg/Kg EPA 82608 12/14/04 92.6 92.4 0.200 70-130 25 Benzene 41504-10 <0.0050 0.0379 0.0371 0.0344 0.0330 mg/Kg EPA 8260E 12/16/04 90.9 88.8 2.26 70-130 25 Toluene 41504-10 <0.0050 0.0379 0.0371 0.0339 0.0329 mg/Kg EPA 8260B 12/16/04 89.5 88.6 1.02 70-130 25 Tert-Butanol 41504-10 <0.0050 0.189 0.186 0.168 0.164 mg/Kg EPA 8260E 12/16/04 88.9 88.4 0.537 70-130 25 Methyl-t-Butyl Ether 41504-10 <0.0050 0.0379 0,0371 0.0370 0.0357 mg/Kg EPA 8260B 12/16/04 97.6 96.1 1.52 70-130 25 Benzene 41504-01 <0.0050 0.0397 0.0391 0.0344 0.0356 mg/Kg EPA 8260E 12/21/04 86.6 90.9 4.82 70-130 25 Toluene 41504-01 <0.0050 0.0397 0.0391 0.0332 0.0343 mg/Kg EPA 8260E 12/21/04 83.8 87.6 4.40 70-130 25 Tert-Butanol 41504-01 <0.0050 0.198 0.196 0.180 0.182 mg/Kg EPA 8260E 12/21/04 90.7 93.0 2.50 70-130 25 Methyl-t-Butyl Ether41504-01 <0.0050 0.0397 0.0391 0.0358 0,0358 mg/Kg EPA 8260E 12/21/04 90.3 91.5 1.28 70-130 25 Approved By: Joe iff KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800