In 1974, the United States government began cleaning up the old Manhattan Project sites under the Formerly Utilized Sites Remedial Action Program (FUSRAP). This included those used by the Metallurgical Laboratory. Stagg Field had been demolished in 1957, but 23 locations in Kent Laboratory were decontaminated in 1977, and another 99 at the Eckhart, Ryerson, and the Jones Laboratory in 1984. About of solid and three 55-gallon drums of liquid waste were collected and shipped to various sites for disposal. The Atomic Energy Commission terminated its lease on the Armory site in 1951, and it was restored to the state of Illinois. Testing in 1977, 1978 and 1987 indicated residual levels of radioactivity that exceeded Department of Energy guidelines, so decontamination was carried out in 1988 and 1989, after which the site was declared suitable for unrestricted use.