The Hanford Site is working on cleaning up the River Corridor, which includes removing contaminated soil and debris, dismantling reactors, and excavating waste sites. The goal is to protect the environment and human health by restoring groundwater and ensuring the Columbia River is safe for aquatic life. This cleanup project is one of the largest ever undertaken by the Department of Energy and has been a top priority since the 1990s due to the proximity of waste sites to the river. The work involves various areas along the Columbia River, including retired plutonium production reactors and fuel fabrication facilities. The ultimate aim is to meet drinking water standards and protect the ecosystem in the area.