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Report Number 26711 <br /> QC Report- Matrix Spike/Matrix Spike Duplicate Date 6/6/2002 <br /> Project Name Chevron 9-57751301 W. <br /> Project Number 77CH.43452.00.0550 <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 26655-04 <0 50 400 400 369 364 ug/L EPA 8260B 614102 922 909 142 70-130 25 <br /> Toluene 26655-04 <0 50 400 400 370 365 ug/L EPA 8260B 614102 92 5 912 142 70-130 25 <br /> Tert-Butanol 26655-04 11 200 200 193 194 ug/L EPA 8260B 614102 909 918 0 947 70-130 25 <br /> Methyl-t Butyl Ether 26655-04 30 400 400 772 761 ug/L EPA 8260B 614102 118 116 229 70-130 25 <br /> Benzene 26658-01 <0 50 400 400 418 400 ug/L EPA 8260B 614102 104 100 445 70-130 25 <br /> Toluene 26658-01 <0 50 40 0 400 400 382 ugtL EPA 8260B 614102 99 9 954 4 58 70-130 25 <br /> Tera Butanol 26658-01 <5 0 200 200 213 215 ug[L EPA 8260B 614/02 106 108 108 70-130 25 <br /> Methyl-t-Butyl Ether 26658-01 0 63 400 400 31 0 30 7 ug/L EPA 8260B 614102 760 752 0 959 70-130 25 <br /> KIFF ANALYTICAL, LLC Approved By J ' I Kiff <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />