The Department of the Interior, through the USGS Earthquake Science Center, is seeking contractors for a five-year Indefinite Delivery, Indefinite Quantity contract focused on radio communications site infrastructure construction and modernization. The work includes maintenance, repair, and upgrades to power systems, shelters, towers, antennas, and related infrastructure for seismic monitoring programs. The anticipated contract start date is November 1, 2026, with performance locations supporting the Earthquake and Volcano Science Centers. No specific budget amount is provided in the notice. This presolicitation notice is for informational purposes only, and prospective contractors are not required to respond.