This is a Sources Sought notice for market research on potential contractors for a 10-year environmental remediation project at three Florida military bases: Eglin Air Force Base, Hurlburt Field, and Tyndall Air Force Base. The work involves investigation, design, construction, and operation for 59 Installation Restoration Program sites and five Military Munitions Response Program sites. The prospective procurement is for a firm-fixed-price contract with an estimated value of $40,000,000, featuring a five-year base period and five option years. The government is seeking information from firms, particularly under NAICS code 562910, to assess capabilities and inform a potential future competitive solicitation. Responses are required to demonstrate specific technical disciplines and past performance for similar projects.