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I <br /> i i i <br /> Report Number 42368 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 2/17/2005 <br /> I <br /> Project Name 7-Eleven Store#21756 <br /> Project Number 77EL 21756.05 <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 Diff <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff Limit Limit <br /> Benzene 42364-03 <0 50 400 400 363 375 ug/L EPA 8260B 2114105 908 937 319 70-130 25 <br /> Toluene 42364-03 66 400 400 484 500 ug/L EPA 8260B 2114105 104 108 378 70-130 25 <br /> Tert-Butanol 42364-03 <5 0 200 200 206 203 ug/L EPA 8260B 2114105 103 101 165 70-130 25 <br /> Methyl-t-Butyl Ether42364-03 340 400 400 411 413 ug/L EPA 8260B 2/14105 163 168 283 70-130 25 <br /> Benzene 42368-04 <0 50 400 400 423 41 5 ug/L EPA 8260B 2114105 106 104 1 79 70-130 25 <br /> Toluene 42368-04 <0 50 400 400 41 1 404 ug1L EPA 8260B 2114105 103 101 180 70-130 25 <br /> Tert-Butanol 42368-04 <50 200 200 199 197 ug/L EPA 8260B 2114105 996 986 1 01 70-130 25 <br /> Methyl-t-Butyl Ether42368-04 <0 50 400 400 395 394 ug/L EPA 8260E 2114/05 989 98 6 0 304 70-130 25 <br /> KIFF ANALYTICAL, LLC Approved By Jo t <br /> if€ <br /> 27952nd St, Suite 300 Davis, CA 95616 530-297-4800 <br /> i <br />