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Report Number 44291 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 6/17/2005 <br /> Project Name 7-Eleven Store #20632 <br /> Project Number 77EL.20632 05 <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 /> Teri-Butanol 44315-02 <5 0 200 200 193 197 ug/L EPA 82608 6116105 963 985 222 70-130 25 <br /> Methyl-t-Butyl Ether44315-02 <0 50 400 400 374 372 ug/L EPA 82608 6/16105 935 930 0 572 70-130 25 <br /> Benzene 44330-03 850 400 400 877 858 ug/L EPA 8260B 6117105 576 100 141 70-130 25 <br /> Toluene 44330-03 57 400 400 979 966 ug/L EPA 8260B 6117/05 103 999 327 70-130 25 <br /> Tert-Butanol 44330-03 44 200 200 234 231 ug/L EPA 8260B 6117105 951 938 1 39 70-130 25 <br /> Methyl-t-Butyl Ether44330-03 <0 50 400 400 344 344 ug/L EPA 82606 6117105 860 861 0 119 70-130 25 <br /> 4 <br /> Approved By Jo iff <br /> KIFF ANALYTICAL, LLC j <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />