Amendment 1 is issued to post questions and answers, schedule site visit for 7/15/2026 at 1pm EDT, meet at Park Headquarters: 4564 Leatherwood Road, Oneida, TN 37841, and to clarify that only 3 HVAC units are to be replaced. Due Date for proposals is extended 7/23/2026 at 5pm EDT. This is a combined synopsis/solicitation for commercial services prepared in accordance with the format in subpart 12.6, as supplemented with additional information included in this notice. This announcement constitutes the only solicitation; proposals are being requested and a written solicitation will not be issued. This project is for Big South Fork National River and Recreation Area - Cyclic Replacement of 3 BISO HVAC Systems, TN and KY locations. This document and incorporated provisions and clauses are those in effect through Federal Acquisition Circular FAC 2026-01. This proposed acquisition will be 100% small business set-aside procurement. The NAICS code is 238220 plumbing, heating, and air-conditioning contractors, $19M TYPE OF CONTRACT: Firm Fixed Price Period of Performance 45 days after NTP SYSTEM FOR AWARD MANAGEMENT (SAM): Federal Acquisition Regulations require that federal contractors register in the System for Award Management (SAM) database at https://www.sam.gov and enter all mandatory information into the system. Award cannot be made until the contractor has registered. Interested Offerors are encouraged to ensure that they are registered in SAM prior to submitting their quote. THESE REGISTRATIONS WILL BE COMPLETED BEFORE TIME OF AWARD. Site Visit: Offerors are encouraged to perform site visit at any time to inspect the site and fully understand the requirement and conditions. Vendor Questions cut-off date: July 10, 2026, 5:00 EDT send via-email to Ashley_Warcewicz@ios.doi.gov Request for Proposals closes July 23, 2026, 5:00PM EDT send via-email all proposals to Ashley_Warcewicz@ ios.doi.gov