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Report Number 33256 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 6/3/2003 <br /> Project Name 7-Eleven Store#20632 <br /> Project Number 77EL 20632 03 <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 /> Tert-Butanol 33348-08 <5 0 200 200 203 207 ug/L EPA 82606 611103 102 103 1 72 70-130 25 <br /> Methyl-t-Butyl Ether 33348-08 <0 50 400 400 38 6 390 ug/L EPA 82606 611103 964 975 1 13 70-130 25 <br /> Approved By Jbel Kiff <br /> KIFF ANALYTICAL, LLC ? <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 U <br />