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Report Number 30544 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 12/31/2002 <br /> Project Name 1313 East Charter Way, <br /> Project Number 244-1511 <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 30544-29 <0 0050 00402 00393 00325 00350 mg/Kg EPA 8260B 12/26/02 81 0 890 950 70-130 25 <br /> Toluene 30544-29 <0 0050 00402 00393 00305 00334 mg/Kg EPA 82608 12/26/02 76 0 85 0 112 70-130 25 <br /> Tert-Butanol 30544-29 <0 0050 0201 0196 0186 0 161 mg/Kg EPA 8260B 12/26/02 924 82 1 11 8 70-130 25 <br /> Methyl-t-Butyl Ether 30544-29 <0 0050 00402 00393 00402 00411 mg/Kg EPA 8260B 12/26/02 100 105 444 70-130 25 <br /> !8u <br /> Approved By J I Kiff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 96616 530-297-4800 <br />