Department of Energy: Environmental Liability Continues to Grow, but Opportunities May Exist to Reduce Costs and Risks [open pdf - 1MB]
From the Document: "The Department of Energy (DOE) has the difficult task of cleaning up hazardous and radioactive waste at sites across the country. The waste was created by nuclear weapons research and production dating back to World War II and the Cold War. DOE's cleanup mission includes addressing contaminated soil and groundwater; deactivating and decommissioning contaminated facilities; and designing, constructing, and operating facilities to treat millions of gallons of radioactive waste. [...] We prepared this report under the authority of the Comptroller General to assist Congress with its oversight responsibilities. This report describes the status of DOE's environmental liability and challenges and opportunities GAO [Government Accountability Office] has identified that DOE faces in managing its cleanup responsibilities."
Government Accountability Office: https://www.gao.gov/