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Report Number: 67191 <br /> QC Report : Matrix Spike/ Matrix Spike Duplicate Date : 02/06/2009 <br /> Project Name : 7-Eleven Store #14113 <br /> Project Number : 77EL.14113.28 <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 /> TPH as Diesel 67092-04 <10 20.0 20.0 17.8 16.8 mg/Kg M EPA 8015 2/5/09 89.2 84.2 5.76 60-140 25 <br /> 1,2-Dichloroethane 67128-01 <0.0050 0.0402 0.0402 0.0387 0.0382 mg/Kg EPA 8260B 2/5/09 96.2 95.0 1.18 70-130 25 <br /> Benzene 67128-01 <0.0050 0.0393 0.0392 0.0333 0.0330 mg/Kg EPA 8260B 2/5/09 84.8 84.2 0.660 70-130 25 <br /> Methyl-t-butyl ether 67128-01 <0.0050 0.0395 0.0394 0.0327 0.0324 mg/Kg EPA 8260B 2/5/09 82.7 82.2 0.638 70-130 25 <br /> Tert-Butanol 67128-01 <0.0050 0.200 0.199 0.173 0.170 mg/Kg EPA 8260B 2/5/09 86.6 85.0 1.86 70-130 25 <br /> Toluene 67128-01 <0.0050 0.0400 0.0400 0.0355 0.0350 mg/Kg EPA 8260B 2/5/09 88.5 87.7 0.987 70-130 25 <br /> 1,2-Dichloroethane 67191-11 <0.0050 0.0395 0.0398 0.0392 0.0379 mg/Kg EPA 8260B 2/6/09 99.0 95.3 3.82 70-130 25 <br /> Benzene 67191-11 <0.0050 0.0386 0.0388 0.0349 0.0345 mg/Kg EPA 8260B 2/6/09 90.5 89.0 1.68 70-130 25 <br /> Methyl-t-butyl ether 67191-11 <0.0050 0.0388 0.0390 0.0346 0.0338 mg/Kg EPA 8260B 2/6/09 89.1 86.6 2.85 70-130 25 <br /> Tert-Butanol 67191-11 <0.0050 0.196 0.197 0.177 0.180 mg/Kg EPA 8260B 2/6/09 90.3 91.0 0.689 70-130 25 <br /> Toluene 67191-11 <0.0050 0.0394 0.0396 0.0371 0.0367 mg/Kg EPA 82606 2/6/09 94.3 92.7 1.72 70-130 25 <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd Street, Suite 300 Davis, CA 95618 530-297-4800 <br />