This Record of Decision (ROD) presents the selected remedy for environmental remediation of contaminated areas within Zone 2 of East Tennessee Technology Park (ETTP), formerly the K-25 Site and the Oak Ridge Gaseous Diffusion Plant (ORGDP), on the U.S. Department of Energy's (DOE's), Oak Ridge Reservation (ORR) in Oak Ridge, Tennessee. The remedy specifically addresses contaminated soil, buried waste, and subsurface structures (including slabs). The decision establishes remediation levels to protect future users of the site and to protect underlying groundwater. This ROD does not include actions to address previously contaminated groundwater, surface water, or sediment, nor does it include actions to address impacts on terrestrial ecological receptors. These actions will result from the future Site-wide ETTP decision for residual contamination. The decisions in this ROD apply to the 800-acre area designated as Zone 2 at ETTP. This area has had heavy industrial use and includes the main plant, laboratory, administration, and disposal areas, as well as maintenance shops and support facilities for the former plant. Environmental remediation consists primarily of removal of existing contamination. Land use controls (LUCs) are selected to ensure that residual contamination remaining after completion of response actions does not pose a short- or long-term threat to human health.