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DIFFERENTIAL SOIL IMPEDANCE OBSTACLE DETECTION FINAL REPORT March 25, 2002-September 30,2004 Principal Investigator: Maximillian J. Kieba Project Manager: Christopher J. Ziolkowski 847-768-0549, Report Issue Date: January 17, 2005 DOE Contract #: DE-FC26-02NT41318 Submitted by Gas Technology Institute 1700 South Mount Prospect Road Des Plaines, Illinois 60018 GTI Project Number: 15328 (formerly 61152) Submitted to NETL AAD Document Control Bldg. 921 U.S. Department of Energy National Energy Technology Laboratory P.O. Box 10940 Pittsburgh, PA 15236-0940 DOE Project Officer Richard Baker