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Report Number 33567 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 6/20/2003 <br /> Project Name 7-Eleven Store #19976 <br /> Project Number 77EL 19976 43 <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 /> Benzene 33560-01 <0 0050 00398 00400 00342 00374 mg/Kg EPA 82606 6/11/03 859 935 844 70-130 25 <br /> Toluene 33560-01 <0 0050 00398 00400 00335 00365 mg/Kg EPA 8260B 6111/03 84 2 91 2 798 70-130 25 <br /> Tert-Butanol 33560-01 <0 0050 0 199 0200 0 171 0 183 mg/Kg EPA 82606 6/11103 860 91 6 638 70-130 25 <br /> Methyl-t Butyl Ether 33560-01 <0 0050 00398 00400 00346 00386 mg/Kg EPA 82606 6111103 870 966 104 70-130 25 <br /> i <br /> I <br /> li <br /> KIFF ANALYTICAL, LLC Approved By id I <br /> I <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />