AIR FORCE CIVIL ENGINEER CENTER PUBLIC NOTICE of PLANNED FIVE-YEAR REVIEW Mountain Home Air Force Base The United States Air Force (USAF) in coordination with the U.S. Environmental Protection Agency (EPA) and the Idaho Department of Environmental Quality (IDEQ), is conducting the sixth Five-Year Review at Mountain Home Air Force Base (MHAFB) in Elmore County, Idaho (EPA ID# ID3572124557). Environmental remedial actions at MHAFB are being addressed under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA, known as Superfund) Section 121. Remedial actions to address environmental concerns at MHAFB are specified in final Records of Decision (RODs) and a ROD Amendment signed between 1992 and 2024 by the USAF, IDEQ, and EPA. The USAF has been conducting cleanup and monitoring activities since the 1980s to ensure continued protection of human health and the environment. Remedial actions are still underway or have been completed but remain in monitoring status. The Five-Year Review is required every five years by Superfund to determine whether the remedy at the site continues to be protective of human health and the environment when contaminants remain at a site. The review includes inspection of the site and cleanup technologies; review of monitoring, performance, and maintenance records; and evaluation of any new relevant regulatory requirements that have been established since the cleanup decision was finalized. A summary of activities and an evaluation of the protectiveness of the implemented remedies will be included in the Five-Year Review Report. This notice invites any interested person to provide written comments and/or to schedule a telephone interview to provide comments. The Five-Year Review Report will consider all written and interview comments received during this public comment period beginning on/about January 27, 2026 and ending on February 26, 2026. Interview requests must be submitted by February 12, 2026. The final report is expected to be available to the public after September 30, 2026. Comments, interview requests, and questions should be directed to: James L Chapman AFCEC RPM Mt Home AFB Restoration Management Section 7290 Weiner St, Bldg 383 Hill AFB, Utah 84056 Phone (801)775-6925 Email: James.chapman.15@us.af.mil The RODs and other reports related to the Mountain Home AFB remediation effort are available for review on the Air Force Civil Engineer Center Administrative Record Search website: https://ar.cce.af.mil/Search To search for documents on the Administrative Record, 1) select "Mountain Home AFB, ID" from the Installation List on the left, and then 2) use the search bars and selection panels at the right to locate documents associated with specific sites. IPL0305970 Jan 21 2026