Even a less deadly accident might disrupt vital war production, particularly of aluminum, and force the evacuation of the Manhattan Project's isotope separation plants. Spreading the facilities at Oak Ridge out more would require the purchase of more land and the expansion needed was still uncertain; for planning purposes, six reactors and four chemical separation plants were envisioned. The ideal site was described by eight criteria: A clean and abundant water supply (at least ) A large electric power supply (about 100,000 KW) A "hazardous manufacturing area" of at least Space for laboratory facilities at least from the nearest reactor or separations plant The employees' village no less than upwind of the plant No towns of more than a thousand people closer than from the hazardous rectangle No main highway, railway, or employee village closer than from the hazardous rectangle Ground that could bear heavy loads The most important of these criteria was the availability of electric power. The needs of war industries had created power shortages in many parts of the country, and use of the Tennessee Valley Authority (TVA) was ruled out because the Clinton Engineer Works was expected to use up all its surplus power. This led to consideration of alternative sites in the Pacific Northwest and Southwest, where there was surplus electrical power. Between December 18 and 31, 1942, just twelve days after the Metallurgical Laboratory team led by Enrico Fermi started up Chicago Pile 1, the first nuclear reactor, a three-man party consisting of Colonel Franklin T. Matthias and DuPont engineers A. E. S. Hall and Gilbert P. Church inspected the most promising potential sites. Matthias reported to Groves that the Hanford Site was "far more favorable in virtually all respects than any other"; the survey party was particularly impressed by the fact that a high-voltage power line from Grand Coulee Dam to Bonneville Dam ran through the site, and there was an electrical substation on its edge. Groves visited the site on January 16, 1943, and approved the selection. The facility became known as the Hanford Engineer Works (HEW), and the site was codenamed SiteW. Land acquisition The Secretary of War, Henry L. Stimson, authorized the acquisition of the land on February 8, 1943. A Manhattan District project office opened in Prosser, Washington, on February 22, and the Washington Title Insurance Company opened an office there to furnish title certificates. Federal Judge Lewis B.