This is a total small business set-aside solicitation for a firm-fixed-price contract to remove sediment from and inspect the rainwater collection system that irrigates Smith Square at Gateway Arch National Park. Performance must occur within 30 days of award, and that period is negotiable. A site visit is scheduled for September 1, 2026, at the Gateway Arch National Park Visitors Center in St. Louis, Missouri. The work falls under NAICS 238220 (Plumbing Contractors) with a $19 million size standard. Registration in SAM is required and quotes must remain valid for 60 days.