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Report Number 43512 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 05/06/2005 <br /> Project Name 7-Eleven Store#14117 <br /> Project Number 77EL 14'117 <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 43535-03 <0 0050 00376 00379 00404 00401 mg/Kg EPA 8260B 512105 108 106 1 54 70-130 25 <br /> Toluene 43535-03 <0 0050 00376 00379 00411 00412 mg/Kg EPA 8260B 512105 109 109 0 624 70-130 25 <br /> Tert-Butanol 43535-03 <0 0050 0 188 0 189 0 169 0 165 mg/Kg EPA 8260B 512105 898 871 2 98 70-130 25 <br /> Methyl-t-Butyl Ether 43535-03 <0 0050 00376 00379 00370 00386 mg/Kg EPA 8260E 512105 983 102 372 70-130 25 <br /> Benzene 43543-04 <0 0050 00398 00397 00396 00432 mg/Kg EPA 82606 514105 993 109 920 70-130 25 <br /> Toluene 43543-04 <0 0050 00398 00397 00371 00399 mg/Kg EPA 8260B 514105 932 100 7 59 70-130 25 <br /> Tert-Butanol 43543-04 <0 0050 0 199 0 198 0 195 0204 mg/Kg EPA 8260B 514105 97 7 102 4 82 70-130 25 <br /> Methyl-t-Butyl Ether43543-04 <0 0050 00398 00397 00387 00390 mg/Kg EPA 82608 514105 971 984 134 70-130 25 <br /> KIFF ANALYTICAL, LLC Approved By Joe iff <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />