ASTSWMO conducted this study to identify mechanisms for evaluating ongoing protectiveness at federal facility sites that have achieved site closeout that allows for unlimited use/unrestricted exposure (UU/UE). This category of sites may present challenges for evaluating their continuing protectiveness as they are typically not subject to periodic reporting requirements or periodic State review. The ASTSWMO State Federal Coordination Focus Group requested information from the 50 States, five Territories, and the District of Columbia (States) on their management of closed federal facility sites, including State definitions of site closeout; State experiences with reopening closed federal facility sites; and, their ability to track or revisit sites that have achieved site closeout. Thirty-three States responded to our request. The analysis of State responses and a list of recommendations for States is provided in this report.