Durango, Colorado – Personnel from Sandia National Laboratories in New Mexico installed four PRBs at the Durango, Colorado, Uranium Mill Tailings Radiation Control Act Title I site in October 1995. These PRBs are managed by DOE Legacy Management. Foamed zero-valent iron bricks produced by Cercona of America, steel wool, and granular iron have been used as reactive media to remove ammonium, arsenic, cadmium, chromium, manganese, molybdenum, nitrate, radium-226, selenium, uranium, vanadium, and zinc contamination from leachate exiting the uranium mill tailings disposal cell. After passing through the zero-valent iron, the leachate contaminant levels meet the regulatory standards.