The Department of Defense, specifically the U.S. Army Corps of Engineers (USACE), intends to award a sole source contract to Tellus Civic Science Corporation for support related to the closure of single-walled underground storage tanks (USTs) in California. The contract aims to assist the EPA Region 9 and the State of California in ensuring compliance with regulations concerning aging UST systems, which includes data management, communication with UST owners and industry associations, and support for grant applications for tank removal. This initiative is crucial for environmental safety and regulatory compliance, as it addresses the management of potentially hazardous UST systems. Interested contractors are encouraged to express their interest and capabilities by providing specific organizational information to the primary contact, Jewel Richardson, at jewel.a.richardson@usace.army.mil, or the secondary contact, Mary C. Fronck, at mary.fronck@usace.army.mil, by the specified deadline.