Z--STGE - GTT Retaining Wall Rehab

The National Park Service is soliciting bids for the GTT Retaining Wall Rehabilitation project under a Small Business Set-Aside (NAICS 238190, $19 million size standard) via a Request for Quote (SF-18) with a response deadline of July 20, 2026. The work involves historic stone masonry rehabilitation at Crystal City, Missouri, with strict requirements including a 1-to-2.5 lime-to-sand mortar ratio, temperature control between 40°F and 95°F during work, and the use of experienced contractors qualified in historic restoration—not merely new construction. Proposers must submit a comprehensive quality control program, a waste management plan, a temporary stormwater pollution prevention plan, and a historic preservation treatment plan, all approved by the Authority Having Jurisdiction. Pre-mobilization submittals include a shoring plan and traffic control plan, both requiring COR/CO approval, along with photo documentation of each project milestone. The contract is firm fixed price with a performance period from August 15, 2026, through February 11, 2027, and a delivery schedule of 180 days after notice to proceed. The solicitation mandates compliance with numerous Federal Acquisition Regulation clauses, including whistleblower protections, prohibitions on confidentiality agreements, and cybersecurity requirements, all with March 2026 deviations applied. Payment protection is required at 100% of contract value, either via a payment bond or irrevocable letter of credit, with performance and payment bonds mandatory if the quote exceeds $150,000. Contractors must comply with Davis-Bacon wage determinations, including a minimum hourly rate of $13.65 for covered workers through December 2026, and adhere to Buy American Act requirements for construction materials. Compliance with OSHA, the System for Award Management, and Unique Entity Identifier registration is mandatory, with SAM status required at submission, award, and throughout performance. Invoicing must be submitted electronically through the Treasury’s Invoice Processing Platform, including a vendor invoice in PDF format with a detailed line-item pricing breakdown. Award will be made on a best value basis using simplified acquisition procedures under FAR Part 13, evaluating price, technical capability, and past performance without assigned weights. The Contracting Officer retains sole authority to modify the contract, while the Contracting Officer’s Representative is limited to technical monitoring and has no authority to obligate funds or