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Report Number 42458 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 2/26/2005 <br /> Protect Name 7-Eleven Store#20632 <br /> Protect Number 77EL 20632 04 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike DUD 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 42454-08 5 6 200 200 195 202 ug/L EPA 8260B 2122105 946 98 5 401 70-130 25 <br /> Methyl-t-Butyl Ether42454-08 32 400 400 769 75 0 ug/L EPA 8260B 2122105 112 107 422 70-130 25 <br /> I <br /> Approved By ,]o ifF � <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />