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Report Number: 31965 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date : 3/17/03 <br /> Project Name : Quik Stop 039 Stockton <br /> Project Number: 7039.15 <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 31965-01 <0.0050 0.0395 0.0395 0.0340 0.0325 mg/Kg EPA 8260B 3/8/03 86.1 82.4 4.48 70-130 25 <br /> Toluene 31965-01 <0.0050 0.0395 0.0395 0.0315 0.0298 mg/Kg EPA 8260B 3/8/03 79.6 75.4 5.42 70-130 25 <br /> Tert-Butanol 31965-01 <0.0050 0.198 0.198 0.153 0.155 mg/Kg EPA 8260B 3/8/03 —77.6 78.4 1.02 70-130 25 <br /> Methyl-t-Butyl Ether 31965-01 <0.0050 0.0395 0.0395 0.0321 0.0309 mg/Kg EPA 8260B 3/8/03 81.3 78.2 3.79 70-130 25 <br /> 0. ,Q Kms' <br /> Approved By: Jbel Kiff <br /> KIFF ANALYTICAL, LLC i� <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 I <br />