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i <br /> Report Number 20750 <br /> i <br /> 4C Report• Matrix Spike/ Matrix Spike Duplicate Date 6/28/2001 <br /> Protect Name 2494 East Freemont <br /> Protect Number 243-0797 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked SampleSample Relative Percent Percent <br /> Spiked Sample Spike Dup Sample Sample Analysis Date Percent Percent Percent Recov Diff <br /> Parameter Sam le Value Level Level Value Value Units Method Analyzed Recov Recov Diff Limit Limit <br /> Spike Recovery Data II <br /> Benzene 20750-07 <0 0050 00487 00497 00515 00558 mg/Kg EPA 8260E 6/21/2001106 112 618 70-130 25 <br /> 11 <br /> Toluene 20750-07 <0 0050 00487 00497 00490 00529 mg/Kg EPA 8260B 6/21/2001106 106 570 70-130 25 <br /> Tert-Butanol 20750-07 <0 0050 00487 00497 00531 00571 mg/Kg EPA 8260E 6121/2001109 115 538 70-130 25 <br /> Methyl-t-Butyl Ether 20750-07 <0 0050 00487 00497 00385 00423 mg/Kg EPA 8260B 6121/200179 0 851 7 38 70-130 25 <br /> I <br /> Approved By J6,; 1 Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite 0 0s, CA 95616 530-297-4800 <br />