Maca - rehab cave trails

The Department of the Interior National Park Service Southeast Region seeks reconstruction of cave trail surfaces at Mammoth Cave National Park in Kentucky, with proposals due May 21, 2026. This procurement is a 100% small business set-aside, firm-fixed-price construction contract.

Place of performance is Mammoth Cave, Kentucky 42259. The project encompasses three line items: base items for reconstruction of the Ruins of Karnak and River Hall cave trails, and an option item for Rafinesque Cave Trail. The period of performance is 150 calendar days from Notice to Proceed, with construction unable to begin before Labor Day 2026 (September 8, 2026); the final completion date is February 28, 2027.

Offerors must demonstrate relevant prior experience completing similar underground or cave construction projects valued between $1,000,000 and $5,000,000 within the past seven years, including trail system construction (pavers, curbs, structural path improvements), material transport and staging in restricted-access environments, implementation of confined-space safety plans compliant with NPS Reference Manual RM50B Chapter 21, and work in archaeologically sensitive areas without excavation. Technical evaluation is pass/fail based on relevant prior experience and past performance (minimum two projects within seven years). Award will be made to the lowest-priced technically acceptable offer.

The NAICS code is 238990, All Other Specialty Trade Contractors. The PSC code is Z2LB, Repair or Alteration of Highways/Roads/Streets/Bridges/Railways. Contractors must procure 100% performance and payment bonds, liability insurance of $1,000,000 per person and $2,000,000 per occurrence, and comply with Davis-Bacon prevailing wage rates. Questions are due May 6 at Noon EDT. A mandatory site visit is scheduled for April 29, 2026 at 10:00 AM CDT at the Visitor Center. Amendment 2, effective May 11, extended the proposal deadline to May 21 and posted Questions and Answers and electrical drawings (sheets 70–77). All submissions must be sent via email to ashley_warcewicz@ios.doi.gov; hard copies and phone calls are not accepted.