[en] This Proposed Plan introduces the Interim Re Measures (IRM) for addressing contaminated soil at the 100-BC-1 Operable Unit, located at the Hanford Site. In addition, this plan includes a summary of other alternatives analyzed and considered for the 100-BC-1 Operable Unit, and provides the public with information for participating in the decisionmaking process. This document notifies the public of when and how to be involved in the process. It is issued jointly by the US Environmental Protection Agency (EPA), as the lead regulatory agency; the Washington State Department of Ecology (Ecology), as the support agency; and the US Department of Energy (DOE), as the responsible agency