This is a Federal Facilities Agreement (FFA) between the United States Department of the Air Force, the State of California, and the United States Environmental Protection Agency, Region 9, for Travis Air Force Base, Fairfield, California. Under the FFA, the Air Force agrees to clean up contamination at Travis AFB pursuant to CERCLA Section 120. As part of the CERCLA cleanup process, the Air Force will prepare Records of Decision (RODs) for various cleanup activities undertaken at Travis AFB. This ROD is for OU4.