The 23,732-acre Tooele Army Depot (TEAD) (North Area) site is located in Toole, Utah. An active U.S. Army base has operated at the site since the early 1940s. Site operations, ammunition storage and equipment repair contaminated soil and groundwater with hazardous chemicals. Remedial actions have taken place at several site areas. Investigations are underway at other areas to assess the nature and extent of contamination and explore appropriate cleanup options.