In December, it was decided that the plutonium production facilities would not be built at Oak Ridge after all, but at the even more remote Hanford Site in Washington state. Compton and the staff at the Metallurgical Laboratory then reopened the question of building the plutonium semiworks at Argonne, but the engineers and management of DuPont, particularly Roger Williams, the head of its TNX Division, which was responsible for the company's role in the Manhattan Project, did not support this proposal. They felt that there would be insufficient space at Argonne, and that there were disadvantages in having a site that was so accessible, as they were afraid that it would permit the research staff from the Metallurgical Laboratory to interfere unduly with the design and construction, which they considered their prerogative. A better location, they felt, would be with the remote production facilities at Hanford. In the end a compromise was reached. On January 12, 1943, Compton, Williams, and Brigadier General Leslie R. Groves, Jr., the director of the Manhattan Project, agreed that the semiworks would be built at the Clinton Engineer Works.