Hilcorp Grayling Platform PSD Construction Permit H₂S Increase Project

Hilcorp Alaska, LLC (Hilcorp) owns and operates the Grayling Platform (Grayling) located in Upper Cook Inlet, Alaska. Grayling is an offshore oil and gas production platform, producing gas and oil with some residual water in the oil. The platform currently burns all its produced gas in platform combustion devices in addition to gas imported from Steelhead Platform. 

Hilcorp is requesting an increase of the short-term permitted fuel gas H₂S limit to from 400 ppmv to 1,250 ppmv to protect ambient air quality and proposes to establish a BACT limit of 98 tons per year (tpy) of sulfur dioxide (SO₂) emissions based on an annual average fuel gas H₂S concentration of 650 ppmv.

For additional information please contact Scott Faber at 907-269-6883 or at scott.faber@alaska.gov

Date	Title and Document Download
12/4/2023	AQ0069CPT02A Application (PDF 9.6M)
12/5/2023	Grayling Fuel Gas H2S Increase Project AQ Modeling Files (ZIP 8.1M)
12/4/2023	Attachment A 2 Grayling H2S Increase Project Potential Emissions Update (XLS 165K)
3/14/2024	AQ0069CPT02 Info Request (PDF 296K)
6/28/2024	Attachment 1 Grayling Response ADEC BACT Info Request Final (PDF 54K)
6/28/2024	Attachment 2 Grayling Response to ADEC AQIA Comments Final (PDF 2.1M)
6/28/2024	Attachment 3 Grayling Response to ADEC AQ Model I O Revised June 2024 (ZIP 5.3M)
6/28/2024	HAK Grayling PSD Application Information Request Response (PDF 107K)