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Report Number 50112 <br /> i <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 5/24/2006 <br /> Project Name QuickStopM Q206,QM <br /> ► I <br /> Project Number 7076.42 - <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 ELevel Levei Value Value Units Method Analyzed Recov Recov Diff _` Limit Limit " <br /> Benzene 50112-01 <0 50 '40 0 3991 423 428 ug/L EPA 8260B 5122106 106 107 123 70-130 25 <br /> Toluene 50112-01 6 6 f40 0 3991 489 4190 ug1L EPA 8260B 5122106 106 106 0 578 70-130 25 <br /> Tert-Butanol 50112-01 <5 0 200 200 218 212 ug/L EPA 8260B 5122106 109 106 221 70-130 25 <br /> Methyl-t-Butyl Ether 50112-01 <0 50 [40 0 39 9 , 356 372 ug1L EPA 8260B 5122106 891 933 4 62 70-130 25 <br /> I <br /> f <br /> r` <br /> 6 <br /> it <br /> Approved 8y Joe ,ft <br /> KIFF ANAL ICAL, LLC <br /> 2795 2nd St, Suite 300 s, CA 95616 530-297-4800 <br />