The Air Force Plant #4 (AFP4) site is located in Tarrant County near Fort Worth Texas. AFP4 is a 760-acre facility that has manufactured military aircraft since 1942. The U.S. Air Force (USAF) currently owns the facility; Lockheed Martin Corporation operates it. Operations contaminated sediments, surface water and ground water with hazardous chemicals. A facility-wide ground water plume generally defines the site boundaries. Following construction of the remedy, long-term cleanup actions are ongoing.