Notice of Application for State Water Quality Certification – POA-2026-00362 v1.0 Putuligayuk River / North Slope Wetlands, Hilcorp Alaska LLC – Put 29 Access Road and Mine Site

This public notice announces that Hilcorp Alaska LLC has submitted a Section 401 Water Quality Certification application to the Alaska Department of Environmental Conservation for the “Put 29 Access Road and Mine Site” project on the North Slope. The project will construct a ~1,000‑ft gravel access road and develop a gravel mine to supply material for ongoing oil‑and‑gas infrastructure. Construction is planned from October 2026 through October 2027, affecting roughly 95 acres of tundra wetlands (approximately 30 acres of temporary disturbance). The applicant proposes avoidance and minimization measures, including deep mining, thermal berms, and overburden reclamation, and requests public comment by September 4, 2026. The DEC will evaluate compliance with the Clean Water Act and Alaska water‑quality standards before issuing certification. • Location: Section 22 & 27, T‑11N, R‑14E, Umiat Meridian, North Slope Borough, Alaska (lat 70.287041, ‑148.55300) • Scope: 1,000‑ft access road (36 ft wide) + 64‑acre gravel mine, overburden berms, 24‑in culvert, wetland disturbance (~95 acres) • Timeline: Construction Oct 2026 – Oct 2027 (1 year) • Regulatory trigger: Section 401 Water Quality Certification (Clean Water Act) • Public comment deadline: Sep 4 2026 (questions/concerns must be submitted by this date) • Primary contact: Kirsten Hoppe, Hilcorp Alaska LLC ( (907) 777‑8416, [email protected] ) • Potential consulting work: environmental review, mitigation planning, permitting support, and public‑comment response services.