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Report Number 264990 <br /> QC Report . Matrix Spike/Matrix Spike Duplicate Date 5/23/2002 <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 26475-08 <0 50 400 40 0 377 376 ug1L EPA 8260B 5121102 94 2 939 0 319 70-130 25 <br /> Toluene 26475-08 12 40 0 400 379 382 ug/L EPA 8260E 5121102 916 92 2 0 734 70-130 25 <br /> Tert-Butanol 26475-08 <5 0 200 200 174 178 ug/L EPA 8260B 5121102 870 88 9 2 16 70-130 25 <br /> Methyl-t Butyl Ether 26475-08 46 400 400 390 401 ug/L EPA 82606 5121102 860 88 8 318 70-130 25 <br /> i <br /> Approved By J I KIff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />