The Hanford Site in Washington State has a big problem with 90 million gallons of radioactive waste stored in tanks. Some of these tanks have leaked waste into the soil. To reduce risks, they are removing waste from the tanks and transferring it to newer tanks. They are also working on retrieving saltcake and sludge waste from the tanks. The goal is to meet regulatory requirements for waste retrieval and tank closure. The method used is called Past Practice Hydraulic Sluicing, which involves using water to dislodge and retrieve tank waste.