Description
The State of North Dakota is seeking a qualified contractor to reclaim an abandoned underground lignite mine near New Salem. The work involves drilling vertical boreholes, installing PVC casing, back‑filling voids with Controlled Low‑Strength Material (CLSM), installing groundwater monitoring wells, providing traffic control, and completing site clean‑up. The contract is fixed‑price, with performance required between early July and mid‑September 2026.
• Approx. 35,000 ft of vertical drilling (4¾–7½ in. dia.) to depths up to 240 ft.
• Installation of ~10,000 ft of 3‑in. I.D. PVC casing and three groundwater monitoring wells (≥ 220 ft deep) at least 21 days prior to drilling.
• Injection of ~1,000 cubic yards of CLSM (ASTM C94 mix) at ≥ 500 psi, with performance‑based payment tied to 28‑day compressive strength.
• Required mobilization, traffic‑control, and site clean‑up services (lumped‑sum, limited to 10 % of total bid).
• Must provide 5 % bid bond, 100 % performance and payment bonds, and meet Buy‑America, insurance, and safety requirements.