The Department of the Interior, through the National Park Service, is soliciting proposals for a chilled water piping inspection at Independence National Historical Park in Philadelphia. The project aims to evaluate the condition and remaining service life of the park's chilled water piping system, which is crucial for maintaining the operational integrity of significant historical structures such as Independence Hall and the Liberty Bell. Contractors will conduct minimally intrusive inspections using video cameras and ultrasonic thickness measurement tools over a span of up to 1,000 feet of piping, with the inspection period scheduled from April 1, 2025, to May 16, 2025. Interested small businesses must submit their quotes electronically by March 20, 2025, and can contact Deborah Coles at Debbie_Coles@nps.gov or 540-677-0325 for further information.