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• • <br /> Report Number 20 � <br /> 4C Report: Matrix Spike/Matrix Spike Duplicate Date . 7/29/2001 <br /> Project Name 2575 Country Club Blvd, <br /> Project Number: 243.0783.003 <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 /> Spike Recovery Data <br /> Benzene 21305-03 <0.50 19.2 206 188 48.1 ug/L EPA 82608 71211200198.0 23.3 123 70-130 25 <br /> Toluene 21305-03 <0 50 192 206 197 494 ug/L EPA 8260B 712112001103 24 0 124 70-130 25 <br /> Tort-Butanol 21305-03 14 960 1030 945 253 ug1L EPA 8260B 71211200184 1 232 114 70-130 25 <br /> Methyl-t-Butyl Ether 21305-03 180 19.2 206 171 164 ug/L EPA 82608 7/21/20010 00 0.00 0.00 70-130 25 <br /> I <br /> KIFF ANALYTICAL, LLC Approved By: J ! Koff <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />