An Initial Assessment Study (IAS) of MCB Camp Pendleton was conducted in September 1984. The IR Program at MCB Camp Pendleton includes 74 sites grouped into five Operable Units (OUs) based on similarities, such as types of environmental issues, selected cleanup methods, and/or physical location. To date, 58 of these IR Sites have been cleaned up and/or closed. There are currently 16 active IR Sites in the MCB Camp Pendleton’s IR Program, all in different phases of the cleanup process.