The 13,000-acre Aberdeen Proving Ground (Edgewood Area Site) site is located in Edgewood, Maryland and includes Gunpowder Neck, Pooles Island, Carroll Island and Graces Quarters. Development and testing of chemical agent munitions took place at this federal facility site. From 1917 to the present, site activities have included conducting chemical research programs, manufacturing chemical agents, and testing, storage and disposal of toxic materials. Site activities contaminated soil, sediment, ground water and surface water with hazardous chemicals. EPA placed the site on the Superfund program’s National Priorities List (NPL) in 1990.