; or (B) to include other Federal agencies that have relevant expertise. (c) Definition of affected Columbia river treaty tribes In this section, the term affected Columbia River Treaty tribes means the Nez Perce Tribe, the Confederated Tribes of Umatilla Indian Reservation, the Confederated Tribes of the Warm Springs Reservation of Oregon, and the Confederated Tribes and Bands of the Yakama Nation. (d) Authorization of appropriations There are authorized to be appropriated to the Secretary of the Interior such sums as are necessary, to remain available until expended— (1) for improvements to existing structures and infrastructure to improve sanitation and safety conditions assessed under subsection (a); and (2) to improve access to electricity, sewer, and water infrastructure, where feasible, to reflect needs for sanitary and safe use of facilities referred to in subsection (a).