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Report Number 45763 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 9/12/2005 <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 Dup Sample Sample Analysis Date Percent Percent Percent Recov Drff <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov _Diff Limit Limit <br /> Tert-Butanol 45786-01 64 200 200 210 205 ug/L EPA 8260E 918/05 102 993 241 70-130 25 <br /> Methyl-t-Butyl Ether 45786-01 <0 50 400 400 387 384 ug/L EPA 8260B 918105 967 961 0 616 70-130 25 <br /> Benzene 45822-04 <0 50 400 400 392 38 0 ug/L EPA 8260B 919105 981 950 325 70-130 25 <br /> Toluene 45822-04 <0 50 400 400 396 38 2 ug/L EPA 8260B 919105 989 956 341 70-130 25 <br /> Tert-Butanol 45822-04 <5 0 200 200 202 198 ug/L EPA 8260B 919105 101 99 1 215 70-130 25 <br /> Methyl-t-Butyl Ether 45822-04 <0 50 400 400 377 377 ug1L EPA 8260B 919105 94 2 942 00532 70-130 25 <br /> � <br /> KIFF ANALYTICAL, LLC Approved By Jo If# <br /> 2795 2nd St,Suite 300 Davis, CA 95616 530-297-4800 <br />