Notice of Application for Air Quality Control Permit AQ1201TVP02 Hilcorp Alaska LLC, Point Thomson Production Facility

The Alaska Department of Environmental Conservation (ADEC) has made a preliminary decision to approve Hilcorp Alaska, LLC’s application for Air Quality Control Operating Permit No. AQ1201TVP02 for the Point Thomson Production Facility, under Alaska Statutes 46.14 and regulation 18 AAC 50. Applicant: Hilcorp Alaska, LLC P.O. Box 196601 Anchorage, Alaska 99519 Location: Latitude: 70.172o North; Longitude: 146.256o West Application: The owner submitted a Title V renewal application on August 13, 2021. Activity: The Point Thomson Production Facility is jointly owned by Hilcorp North Slope, LLC (HNS) and ExxonMobil Alaska Production Inc. (EMAP). The stationary source is operated by Hilcorp Alaska, LLC (HAK), which is also the Permittee for this stationary source’s air quality control operation permit. The facility is permitted as a gas cycling operation to process approximately 200 million standard cubic feet-per-day of gas in order to recover approximately 10,000 barrels-per-day of

hydrocarbon condensate. The recovered hydrocarbon condensate product is sent to market via pipeline. The collected gas is used as fuel gas in the combustion turbines and the unburned fuel gas is re-injected in the field reservoir. Equipment permitted at the Point Thomson Production Facility includes one hot oil unit heater, one used oil-fired heater, two fuel gas-fired combustion turbines, two dual fuel-fired combustion turbines, one waste incinerator, two flares, 14 heaters, two stationary fire water pump engines, six stationary generator engines, and 38 nonroad engines. Emissions: The potential annual emissions of regulated air pollutants at the stationary source will not exceed: 245.5 tons of Nitrogen Oxides, 243.3 tons of Carbon Monoxide, 19.4 tons of Particulate Matter, 32.2 tons of Sulfur Dioxide, 187.7 tons of Volatile Organic Compounds, and 5.6 tons of Hazardous Air Pollutants (HAP), with highest individual HAP (Hydrochloric acid) estimated at 3.50 tons. The potential annual emissions for Greenhouse Gases are estimated at 217,835.8 tons of carbon dioxide equivalent emissions. The total annual potential emissions of regulated air pollutants, other than greenhouse gases, are 728.2 tons. ADEC Preliminary Review: Based on review of the application, ADEC drafted a preliminary permit decision for the Point Thomson Production Facility under AS 46.14 and 18 AAC 50. Available Information: Copies of the permit application, ADEC’s draft operating permit, and draft statement of basis (SOB) are available at the following offices: ADEC Air Permits Program, 410 Willoughby Avenue, 2nd Floor, Juneau, AK 99801-1795ADEC 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 draft documents, as long as they are received by the close of the public comment period. 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. ADEC complies with Title II of the Americans with Disabilities Act of 1990. If you are a person with a disability who may need a special accommodation in order to participate in this public process, please contact Claire Fishwick at (907) 465-5066 or TDD Relay Service 1-800-770-8973/TTY 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 draft operating permit may be submitted electronically via ADEC’s public notice site at https://aq.alaskadec.commentinput.com/?id=VQ8NE or to Joshua Klina by mail to P.O. Box 111800, Juneau, AK 99811 or by email to joshua.klina@alaska.gov. Comments must be received by close of public comments period at 11:59 p.m. Alaska time on March 6, 2023.