This is an Expression of Interest for the upgrade and replacement of critical firewater infrastructure at the Test Area North (TAN) facilities of the Idaho National Laboratory in Idaho. The required work includes replacing corroded piping, fire pumps, tank heaters, and associated controls and instrumentation across multiple specified structures. The deadline for submitting an Expression of Interest is July 1, 2026. Responses will be used to identify qualified vendors for a future Request for Proposal process.