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• ! <br /> Report Number 31520 <br /> QC Report. Matrix Spike/Matrix Spike Duplicate Date 2121/03 <br /> Project Dame SANCHEZ <br /> Project Number <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 31462-13 18 400 400 56 0 562 ug/L EPA 8260E 2115103 961 966 0 519 70-130 25 <br /> Toluene 31462-13 <0 50 400 400 377 34 9 ug/L EPA 8260B 2115103 94 2 872 772 70-130 25 <br /> Tert-Butanol 31462-13 <50 200 200 192 190 ug/L EPA 82608 2115103 962 95 0 124 70-130 25 <br /> Methyl-t-Butyl Ether 31462-13 21 400 400 430 428 ug/L EPA 8260B 2115103 102 102 0 368 70-130 25 <br /> Approved By J I Kiff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />