Description
The State of North Dakota’s Public Service Commission is seeking a qualified contractor to reclaim an abandoned underground lignite‑coal mine near New Salem. The work consists of drilling vertical boreholes, installing PVC casing, installing groundwater monitoring wells, and back‑filling the mine voids with Controlled Low‑Strength Material (CLSM). The contractor must also provide traffic control, site clean‑up, and coordinate with a material‑testing subcontractor for CLSM quality verification. The contract is fixed‑price, with a performance window from early July to early September 2026, and includes performance and payment bond requirements.
• Drill approximately 35,000 ft of vertical boreholes (4¾″–7½″ dia., up to 240 ft deep).
• Install ~10,000 ft of PVC casing and three groundwater monitoring wells (≈ 220 ft each).
• Inject ~1,000 cubic yd of CLSM into mine voids, meeting specific mix‑design specifications.
• Provide traffic‑control, site clean‑up, daily logging, and coordination with a material‑testing subcontractor.