 In the end, Groves personally issued instructions to clear Oppenheimer on 20 July 1943.The idea of locating Project Y at the Metallurgical Laboratory in Chicago, or the Clinton Engineer Works in Oak Ridge, Tennessee, was considered, but in the end it was decided that a remote location would be best.A site in the vicinity of Los Angeles was rejected on security grounds, and one near Reno, Nevada as being too inaccessible.