The National Park Service (NPS) is seeking contractors for a potential project involving the construction of a replacement retaining wall at Cuyahoga Valley National Park in northeast Ohio. The project requires contractors to provide all necessary labor, materials, and equipment to clear and grub the site, construct a 142.5-foot retaining wall per American Railway Engineering and Maintenance-of-Way Association (AREMA) standards, and replace ballast as needed, ensuring a minimum service life of 30 years for the new structure. This opportunity is significant for maintaining the integrity of park infrastructure and ensuring safety for visitors and operations. Interested contractors must respond to the market survey by April 8, 2025, via email to Christopher Bauer at christopher_bauer@nps.gov, with a project magnitude estimated between $500,000 and $1 million and a small business size standard of $45 million under NAICS code 237310.