Broomfield has been interested and involved in the monitoring of the Rocky Flats Environmental Technology Site (RFETS) since the early 1970's.  Broomfield City Council has representatives on the Rocky Flats Stewardship Council Board of Directors.  After a rigorous cleanup and closure of the site, Rocky Flats was de-listed from the Superfund National Priorities List for environmental clean up in 2007.  All of the buildings have been demolished and the site is being restored and revegetated to its natural state. Kaiser-Hill announced that physical closure of the site was complete October 13, 2005.  Regulatory closure documents are filed and approved in 2007. The site has been  turned over to the U.S. Fish and Wildlife Service to manage as a wildlife refuge.