Although the design of the reactor was not yet complete, DuPont began construction of the plutonium semiworks on February 2, 1943, on an isolated site in the Bethel Valley about southwest of Oak Ridge officially known as the X-10 area. The site included research laboratories, a chemical separation plant, a waste storage area, a training facility for Hanford staff, and administrative and support facilities that included a laundry, cafeteria, first aid center, and fire station. Because of the subsequent decision to construct water-cooled reactors at Hanford, only the chemical separation plant operated as a true pilot. The semiworks eventually became known as the Clinton Laboratories, and was operated by the University of Chicago as part of the Metallurgical Project.