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Report Number 23953 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 1/3/2002 <br /> Project Name Guevera <br /> Project Number 3490 <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 23954-01 <0 50 199 197 195 192 ug1L EPA 8260B 12121120098 3 973 102 70-130 25 <br /> Toluene 23954-01 <0 50 199 197 184 181 ug/L EPA 8260B 12121120092 8 91 8 1 11 70-130 25 <br /> Tert-Butanol 23954-01 <5 0 99 4 98 6 102 103 ug/L EPA 8260B 121211200102 104 1 75 70-130 25 <br /> Methyl-t-Butyl Ether 23954-01 <0 50 199 197 189 188 ug/L EPA 82608 12121/20095 0 95 1 0 131 70-130 25 <br /> f <br /> ti <br /> Approved By Jbel Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive Suite D Davis CA 95616 530-297-4800 J <br />