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Report Number: 40554 <br /> QC Report., Matrix Spike/Matrix Spike Duplicate Date : 10/19/2004 <br /> Project Name : Tesoro 67080 <br /> I <br /> Project Number : D003-007 <br /> I <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 /> TPH as Diesel Blank <50 1000 1000 979 1050 ug/L M EPA 8015 10/13/04 97.9 105 6.87 70-130 25 <br /> Benzene 40535-01 27 40.0 40.0 70.6 69.0 ug/L EPA 8260B 10/15/04 108 104 3.72 70-130 25 <br /> Toluene 40535-01 3.0 40.0 40.0 42.6 42.3 ug/L EPA 8260B 10/15/04 99.1 98.2 0.914 70-130 25 <br /> Tert-Butanol 40535-01 <5.0 200 200 194 194 ug/L EPA 82608 10/15/04 97.2 96.8 0.414 70-130 25 <br /> Methyl-t-Butyl Ether 40535-01 <0.50 40.0 40.0 42.2 42.3 ug/L EPA 8260B 10/15/04 106 106 0.239 70-130 25 <br /> Benzene 40554-03 <0.50 40.0 40.0 39.5 39.4 ug/L EPA 8260B 10/15/04 98.7 98.6 0.180 70-130 25 <br /> Toluene 40554-03 <0.50 40.0 40.0 39.4 39.2 ug/L EPA 8260B 10/15/04 98.5 98.0 0.515 70-130 25 <br /> Tert-Butanol 40554-03 <5.0 200 200 193 193 ug/L EPA 82608 10/15/04 96.4 96.5 0.114 70-130 25 <br /> Methyl-t-Butyl Ether 40554-03 <0.50 40.0 40.0 37.7 38.1 ug/L EPA 8260B 10/15/04 94.3 95.3 1.04 70-130 25 <br /> I <br /> I <br /> i <br /> Approved By: io iff <br /> K1FF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />