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NPDES Permit for Hilcorp Alaska Liberty Drilling and Production Island

Below are EPA's National Pollutant Discharge Elimination System (NPDES) final permit and supporting documents for the Hilcorp Alaska, LLC Liberty Drilling and Production Island in federal waters of the outer continental shelf (Stefansson Sound in the Beaufort Sea).

Permit number: AK0053805
Effective date: December 31, 2018
Permit expires: December 30, 2023

NPDES Permit, Hilcorp Liberty Drilling and Production Island, #AK0053805 (pdf) (373.75 KB, October 26, 2018)
Final wastewater discharge permit.
NPDES Permit Fact Sheet, Hilcorp Liberty Drilling and Production Island, #AK0053805 (pdf) (1.28 MB, August 2017)
Technical basis for permit.
Record of Decision (ROD) on NPDES Permit for Hilcorp Liberty Drilling and Production Island, #AK0053805 (pdf) (131.54 KB, October 26, 2018)
Basis for permit issuance in accordance with the National Environmental Policy Act (NEPA).
Ocean Discharge Criteria Evaluation (ODCE), Hilcorp Liberty Drilling and Production Island, #AK0053805 (pdf) (694.72 KB, October 2018)
Required evaluation for point-source discharges of pollutants into the territorial seas, the contiguous zone, and the oceans.
Response to Comments on Draft NPDES Permit for Hilcorp Liberty Drilling and Production Island, #AK0053805 (pdf) (225.85 KB, October 2018)
EPA's responses to public comments on the August 2017 draft permit.