[en] Plutonium production and purification processes at the Hanford Site generated and/or used numerous radioactive and hazardous substances, leaving behind a wide variety of hazardous, radioactive, and mixed wastes in the forms of contaminated soil, groundwater, buried waste, equipment, piping, and structures. Currently, there are at least 1,391 individual waste sites on the Hanford Site. Based on existing characterizations, 174 of the sites contain nonhazardous waste, 134 contain hazardous waste, 133 contain radioactive waste, and 950 contain mixed wastes. These sites are being remediated, decontaminated, and decommissioned by activities within the Hanford Site Environmental Restoration (ER) Program. This document presents a baseline for the many technologies anticipated to perform and support various types of remedial actions. It also discusses a variety of remediation strategies that, in combination, pose a number of technical, economic, and regulatory constraints that affect the selection of individual remediation technologies