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Report Number: 84838 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date : 05/16/2013 <br /> Project Name : Proposed 7-Eleven Store #36084 <br /> Project Number: 185750114.201.0400 <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 • <br /> 84844-05 <0.50 40.0 40.0 39.6 38.4 ug/L EPA 82606 5/15/13 99.0 96.0 3.10 70.0-130 25 <br /> Ethylbenzene <br /> 84844-05 <0.50 40.0 40.0 40.0 38.4 ug/L EPA 82608 5/15/13 99.9 96.1 3.82 70.0-130 25 <br /> Methyl-t-butyl ether <br /> 84844-05 2.0 39.4 39.4 41.2 42.9 ug/L EPA 8260B 5/15/13 99.4 104 4.22 70.0-130 25 <br /> P + M Xylene <br /> 84844-05 0.69 40.0 40.0 36.4 35.0 ug/L EPA 8260B 5/15/13 89.2 85.8 3.95 70.0-130 25 <br /> Toluene <br /> 84844-05 <0.50 40.0 40.0 39.1 37.9 ug/L EPA 8260B 5/15/13 97.7 94.7 3.05 70.0-130 25 <br /> • <br /> m <br /> CD <br /> CD <br /> A <br /> O_ <br /> v <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd Street, Suite 300 Davis, CA 95618 530-297-4800 <br />