The former U.S. Naval Ammunition Support Detachment (NASD) takes up the western side of Vieques Island. On April 30, 2001, the U.S. Navy transferred about 4,000 acres of NASD to the Municipality of Vieques, 3,100 acres to the U.S. Department of the Interior (U.S. Fish and Wildlife Service), and 800 acres to the Puerto Rico Conservation Trust.

As part of the transfer agreement, the Navy has been taking the actions needed to protect both human health and the environment in certain areas, which may contain hazardous substances resulting from Navy activities in the past. The Navy will retain easements to these areas until the investigation and any necessary cleanup is complete.

The West Vieques Tour of IR Sites presents a brief history and site photos of the sites that are currently being investigated. 

More detailed information is available in the online library of Technical Documents and the Administrative Record.