Z--MACA - REHAB CAVE TRAILS

This contract, identified as RFP 140P5326R0007, is a firm-fixed-price construction solicitation issued by the National Park Service under the Department of the Interior for the rehabilitation of cave trail surfaces in the Ruins of Karnak, River Hall, and Rafinesque Hall at Mammoth Cave National Park in Kentucky. The work is 100% set aside for small businesses under NAICS code 238990, with award to be made on a lowest price technically acceptable basis. Proposals must be submitted electronically by 5:00 PM EDT on May 21, 2026, following Amendment 2, which extended the original deadline from May 15, 2026. All questions must be sent to ashley_warcewicz@ios.doi.gov by May 6, 2026, and no phone calls are accepted. A mandatory site visit is scheduled for April 29, 2026, at 10 a.m. CDT at the Mammoth Cave Visitor Center, with Christopher Parker serving as the point of contact. The period of performance is 150 days from notice to proceed, with work anticipated to start on September 1, 2026, and conclude by February 28, 2027. Proposals must be structured into five volumes with strict page limits: a one-page cover letter, up to 15 pages each for technical and past performance sections, a two-page price schedule, and an unlimited contract documentation volume. All submissions must be in standard Microsoft Office formats, free of macros or hidden content, and include a signed SF-1442. Technical capability is evaluated as pass/fail on four critical factors: experience constructing trails in confined underground environments, logistical capability under restricted access, a comprehensive safety plan addressing radon, confined-space controls, and ventilation per NPS RM-50B Chapter 21, and ability to maintain public access during operations. Past performance is assessed as acceptable, neutral, or unacceptable, with neutral being sufficient for award eligibility. Pricing must be firm-fixed and submitted using Attachment 4, with unbalanced pricing posing a risk of rejection. The contractor is required to comply with federal labor requirements under Executive Order 14026, environmental standards including recycled content thresholds per ASTM D5663 and D5834, and must provide performance and payment bonds with