This Base Realignment and Closure (BRAC) Cleanup Plan (BCP) describes the status, management and response strategy, and action items related to Umatilla Depot Activity (UMDA) ongoing environmental restoration and associated compliance programs. These programs support restoration of the installation property, which is necessary to meet the requirements for property disposal and reuse activities associated with the closure of the installation. The Commission on Base Closures recommended UMDA for realignment. The realignment will be chemical demilitarization (Chem Demil) of chemical agents stored at UMDA. The ongoing Chem Demil prevented closure of UMDA because the U.S. Army cannot begin on-site destruction of the chemical agents until approximately 1996, which falls outside the Commission's allowed timeframe for completing closures. The depot will be realigned to the maximum extent possible in order to facilitate closure as soon as the Chem Demil mission is complete. The scope of the BCP considers the following regulatory mechanisms: the BRAC Act; National Environmental Policy Act (NEPA); Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) as amended by the Community Environmental Response Facilitation Act; Resource Conservation and Recovery Act (RCRA); and other applicable laws. The BCP is a planning document, and the information and assumptions presented may not necessarily have complete approval from the U.S. Army and/or federal and state regulatory agencies. The BCP is a dynamic document that will be updated regularly to reflect the current status and strategies of remedial actions (RAs).