This is a sole-source contract modification to an existing IDIQ for pump and motor inspection and maintenance at the Washington Aqueduct. The work will be performed at the Dalecarlia and Little Falls Pumping Station Facilities, which serve Washington, DC and parts of Northern Virginia. The contract has a total potential duration of ten years, consisting of five base years and five one-year options. No specific budget amount is provided. The justification is based on critical infrastructure needs and the sole-source provider, Keystone Acquisition Company, Inc.