Z--KNRI REPLACE VC SANITARY PLUMBING/SEPTIC

The National Park Service is seeking construction services to replace the sanitary plumbing and septic system at the Knife River Indian Villages National Historic Site in Stanton, North Dakota. This Invitation for Bid (IFB), solicitation 140P6326B0006, is a 100% Indian Small Business Economic Enterprise (ISBEE) set-aside. The project involves a firm-fixed-price contract to replace the Visitor Center's infrastructure within 120 days of the notice to proceed. Technical requirements are detailed in the attachment package, which includes geotechnical reports, percolation testing, and engineering drawings. Amendment 0001 updated the submission requirements by removing the experience questionnaire and adding a 20% bid bond and a Limitation on Subcontracting report. Bids must be submitted electronically by June 23, 2026, with a virtual bid opening to follow. The scope includes installing a new pumped sanitary system with a 3,000-gallon septic tank and an absorption field designed for a 640-gallon flow. Specifications include a 60-inch minimum frost protection depth and specific compaction standards. The project includes maintaining existing system operations through Labor Day and providing portable toilets during construction. Construction is subject to a 60-inch frost protection depth and archeological preservation protocols. The septic system design includes a 640-gallon flow and an 812.8-square-foot absorption field.