 The Albuquerque District supervised $9.3 million of construction at Los Alamos, and the Manhattan District, another $30.4 million.The initial work was contracted to the M. M. Sundt Company of Tucson, Arizona, with work commenced in December 1942.Groves initially allocated $300,000 for construction, three times Oppenheimer's estimate, with a planned completion date of 15 March 1943.