The scope of the Department’s environmental cleanup includes stabilization and disposition of some of the earth’s most hazardous materials generated from spent nuclear fuel and nuclear radioactive waste material. The cleanup program resulting from over five decades of nuclear weapons production and energy research is the largest active cleanup program in the world. In addition, after active cleanup, residual risks will remain for significant periods of time at most DOE cleanup sites. The Department will take appropriate action to protect human health and the environment from these residual risks. The Department continues its effort to construct a repository for the final disposal of spent nuclear fuel and high level radioactive waste.