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Report Number: 56273 <br /> QC Report: Laboratory Control Sample(LCS) Date : 5/8/2007 <br /> Project Name : 7-Eleven Store #14117 <br /> Project Number: 77EL.14117.07 <br /> LCS <br /> LCS Percent <br /> Spike Analysis Date Percent Recov. <br /> Parameter Level Units Method Analyzed Recov. Limit <br /> Benzene 40.0 ug/L EPA 8260B 5/4/07 91.4 70-130 <br /> Toluene 40.0 ug/L EPA 8260B 5/4/07 89.6 70-130 ' <br /> Tert-Butanol 200 ug/L EPA 8260B 5/4/07 91.3 70-130 <br /> Methyl-t-Butyl Ether 40.0 ug/L EPA 8260B 5/4/07 92.8 70-130 <br /> Benzene 40.0 ug/L EPA 8260B 5/4/07 1.02 70-130 <br /> Toluene 40.0 ug/!- EPA 8260B 5/4/07 101 707130 <br /> Tert-Butanol 200 ug/L EPA 8260B 5/4/07 98.4 70-130 <br /> Methyl-t-Butyl Ether 40.0 ug/L EPA 8260B 5/4/07 97.8 70-130 <br /> Benzene 40.0 ug/L EPA 8260B 5/4/07 90.5 70-130 <br /> Toluene 40.0 ug/L EPA 8260B 5/4/07 89.3 70-130 <br /> Tert-Butanol 200 ug/L EPA 82606 5/4/07 90.4 70-130 . <br /> Methyl-t-Butyl Ether 40.0 ug/L EPA 8260B 5/4/07 90.2 70-130 <br /> Benzene 40.0 ug/L EPA 82608 5/4/07 94.7 70-130 <br /> Toluene 40.0 ug/L EPA 8260B 5/4/07 96.3 70-130 <br /> Tert-Butanol 200 ug/L EPA 8260B 5/4/07 108 70-130 <br /> Methyl-t-Butyl Ether 40.0 ug/L EPA 8260B 5/4/07 88.7 70-130 <br /> Benzene 40.0 ug/L EPA 8260B 5/4/07 97.2 70-130 <br /> Y <br /> KIFF ANALYTICAL, LLC Approved By: Jo Kiff <br /> 2795 2nd Street, Suite 300 Davis, CA 95618 530-297-4800 <br />