This plan contains a description of the personnel and procedures for managing the Remedial Investigation/Feasibility Study (RI/FS) at the U.S. Army Jefferson Proving Ground (WG) in Madison, Indiana. The RI/FS is being performed to support base closure initiated in April of 1989, when Congress mandated that JPG be closed and its mission realigned with Yuma Proving Ground, Arizona. As a result, the U.S. Army Environmental Center (USAEC) was given the responsibility of conducting the environmental investigation associated with the Base Closure Program. An enhanced Preliminary Assessment (PA) was completed in March 1990, and a follow-up Master Environmental Plan (MEP) was prepared in November 1990. Results of these initial evaluations indicated that additional studies of identified Solid Waste Management Units (SWMUs) and areas requiring environmental evaluation (AREEs) were needed to satisfy the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) as amended by the Superfund Amendments and Reauthorization Act (SARA 1986). This act requires that a RI/FS be conducted to: 1. Define the extent and magnitude of environmental contamination at JPG; 2 Assess the human health and environmental risk from contamination at JPG; 3. Determine the needs for remedial actions at JPG; and 4. Develop and evaluate the remedial-action alternatives.