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Report Number: 40554 <br /> QC Report : Laboratory Control Sample(LCS) Date : 10/19/2004 <br /> Project Name : Tesoro 67080 <br /> Project Number: D003-007 <br /> I <br /> LCS <br /> LCS Percent <br /> Spike Analysis Date Percent Recov. <br /> Parameter Level Units Method Analyzed Recov. Limit <br /> Benzene 40.0 ug/L EPA 8260B 10/15/04 98.2 70-130 <br /> Toluene 40.0 ug1L EPA 82606 10115/04 98.0 70-130 <br /> Tert-Butanol 200 ug1L EPA 8260B 10/15/04 93.1 70-130 <br /> Methyl-t-Butyl Ether 40.0 ug/L EPA 82606 10/15/04 99.2 70-130 <br /> I <br /> Benzene 40.0 ug/L EPA 8260B 10/15/04 95.4 70-130 <br /> Toluene 40.0 ug/L EPA 8260B 10/15/04 98.9 70-130 <br /> Tert-Butanol 200 ug1L EPA 8260B 10/15/04 91.2 70-130 <br /> Methyl-t-Butyl Ether 40.0 ug/L. EPA 8260B 10/15/04 87.5 70-130 <br /> I <br /> 4 <br /> KIFF ANALYTICAL, LLC Approved By: Jo Kiff <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />