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Notice of Application for State Air Quality Permit AQ0091TVP03 and AQ0091MSS03 Hilcorp Alaska LLC, Tyonek Platform

PUBLIC NOTICE
STATE OF ALASKA
DEPARTMENT OF ENVIRONMENTAL CONSERVATION
HILCORP ALASKA, LLC

TYONEK PLATFORM

The Alaska Department of Environmental Conservation (ADEC) has made a preliminary decision to approve Hilcorp Alaska, LLC’s application for Air Quality Control Minor Permit AQ0091MSS03 Revision 2 for the Tyonek Platform. Additionally, ADEC proposes to renew Air Quality Control Operating Permit AQ0091TVP03 using the integrated review procedures described in 18 AAC 50.326(c)(1).

Applicant:
Hilcorp Alaska, LLC
3800 Centerpoint Dr., Suite 1400
Anchorage, AK 99503

Location:
Latitude 61º 04´ 34.3" North; Longitude 150º 57´ 02.6" West
Anchorage, AK 99503

Application:
Hilcorp Alaska, LLC applied for a minor permit under 18 AAC 50.508(6) to revise minor permit conditions for the Crane Replacement Project.  Hilcorp Alaska, LLC also applied for a renewal operating permit and submitted supplemental information on February 23, 2023.  This public notice is for the preliminary minor permit and draft operating permit.

Activity:
The Tyonek Platform is an offshore production platform that produces natural gas to be transferred to the Harvest pipeline for sale.

Emissions:
The potential annual emissions of regulated air pollutants at the stationary source will not exceed: 368.28 tons of Nitrogen Oxides, 237.13 tons of Carbon Monoxide, 15.38 tons of Particulate Matter, 56.05 tons of Sulfur Dioxide, 28.55 tons of Volatile Organic Compounds, and 4.40 tons of Hazardous Air Pollutants (HAP), with highest individual HAP (formaldehyde) estimated at 1.79 tons.  The potential annual emissions for Greenhouse Gases are estimated at 161,222 tons of carbon dioxide equivalent emissions.  The total annual potential emissions of regulated air pollutants, other than greenhouse gases, are 705.39 tons.

ADEC Preliminary Review: 
Based on review of the application, ADEC drafted a preliminary permit decision for the Tyonek Platform under AS 46.14 and 18 AAC 50.

Available Information:
Copies of the permit applications, ADEC’s preliminary minor permit, technical analysis report (TAR), draft operating permit, and statement of basis (SOB) are available at the following offices:
ADEC Air Permits Program, 410 Willoughby Avenue, Suite 303, Juneau, AK 99801 
ADEC Air Permits Program, 555 Cordova Street, Anchorage, AK 99501

These documents are also available at ADEC’s website at: http://dec.alaska.gov/Applications/Air/airtoolsweb/AirPermitsApprovalsAndPublicNotices/

Opportunity for Public Participation:
Any interested person may present written statements relevant to the preliminary decision within 30 days after the first publication date.  ADEC will consider all comments received and make any changes ADEC finds beneficial or necessary to assure compliance with 18 AAC 50 or state law.  ADEC will issue a final decision to issue or deny the permit after the close of the public comment period.  Any person may request a public hearing and that hearing will be held if ADEC finds that good cause exists.

ADEC complies with Title II of the Americans with Disabilities Act of 1990 (ADA). If you are a person with a disability who may need a special accommodation in order to participate in this public process, please contact please contact Megan MacPherson at megan.macpherson@alaska.gov, 1-907-269-3096;; Alaska Relay Service/TTY/TDD 1-800-770-8973 or dial 711 by the 15th day of this public comment period to ensure that any necessary accommodations can be provided.

Comments relevant to the preliminary minor permit and proposed operating permit may be submitted electronically via ADEC’s public notice site at https://dec.alaska.gov/Applications/Air/airtoolsweb/FormalComments, or to Peter Saengsudham by mail to 555 Cordova Street, Anchorage, AK 99501, or by email to peter.saengsudham@alaska.gov and dec.air.comment@alaska.gov.  Comments must be received by close of public comments period at 11:59 p.m. Alaska time on May 12, 2025. Except for comments classified under AS 46.14.520, all public comments submitted during the public comment period can be viewed at https://dec.alaska.gov/Applications/Air/airtoolsweb/AirPermitsApprovalsAndPublicNotices after the public comment period.



Publish:
Alaska Web 
Close of Public Comment Period: 11:59 P.M., May 12, 2025
 

Attachments, History, Details

Attachments

None

Revision History

Created 4/11/2025 10:44:18 AM by rmmurphy
Modified 4/11/2025 10:44:56 AM by rmmurphy
Modified 4/11/2025 10:45:57 AM by rmmurphy

Details

Department: Environmental Conservation
Category: Public Notices
Sub-Category:
Location(s): Statewide
Project/Regulation #: Air Quality Permit AQ0091TVP03 and AQ0091MSS03
 
Publish Date: 4/11/2025
Archive Date: 5/13/2025
 
Events/Deadlines: