Workers attach crane cables to a huge manifold on the roof of the former Chemetco secondary copper smelter in Hartford, Illinois, as demolition of the buildings at the Superfund site began on Sept. 13. The facility operated from 1969 until 2001 when it went into bankruptcy and was sealed by the Illinois EPA as a result of hazardous materials left on site. It became a federal Superfund site in March 2010.