billion, was made retrospective to October 2007, and ended in August 2011. Since then demolition work has been carried out by DOE's current environmental management contractor, URS | CH2M Hill Oak Ridge (UCOR). Demolition of the K-25 facility was expected to be completed by July 2014. By 23 January 2013, demolition of the north and west wings was complete, with only a small portion of the east wing remaining (6 units out of 24 on the east wing). The final section of the east wing was brought down on 19 December 2013. The last debris was removed in 2014. Demolition of K-27, the last of the five gaseous diffusion facilities at Oak Ridge, began in February 2016. US Senator Lamar Alexander and US Congressman Chuck Fleischmann joined 1,500 workers to watch the final wall come down on 30 August 2016. Its demolition was completed on 28 February 2017. Since 2020, the K-25 site is being redeveloped in part into a general aviation airport to service the city of Oak Ridge. The project is a joint-effort between Oak Ridge city officials, the Tennessee Department of Transportation, the Appalachian Regional Commission, the DOE, and the Federal Aviation Administration. Several small private nuclear facilities are also planned on the site. Commemoration On 27 February 2020, the K-25 History Center, a 7,500-square foot museum opened at the site. The museum is a branch of the American Museum of Science and Energy (AMSE) and features hundreds of original artifacts and interactive exhibits related to the K-25 site. Notes References External links K-25 History Center on-site museum K-25 Virtual Museum Historic photos of K25 by Ed Westcott Demolition of the north end of the K-25 building (Video) Historic American Engineering Record (HAER) documentation, filed under State Highway 58, Oak Ridge, Anderson County, TN: 1944 establishments in Tennessee 2013 disestablishments in Tennessee Buildings and structures completed in 1944 Buildings and structures demolished in 2013 Historic American Engineering Record in Tennessee History of the Manhattan Project Isotope separation facilities of the Manhattan Project Isotope separation facilities in the United States Military Superfund sites Nuclear weapons infrastructure of the United States Oak Ridge, Tennessee Roane County, Tennessee Superfund sites in Tennessee