APDES Proposed Final Individual Permit AK0043354 5-Day Notice of Review– ConocoPhillips Alaska, Inc. Kuparuk Seawater Treatment Plant

Following the closure of a 30-day public notice period, DEC has prepared an APDES proposed final individual permit (AK0043354) for ConocoPhillips Alaska, Inc. which operates the Kuparuk Seawater Treatment Plant. Prior to making the final decision to issue the permit, DEC invites you to view the proposed final permit and associated documents. This review period is to allow the permittee the opportunity to review the proposed permit prior to final issuance. Comments from the general public were accepted during the Public Notice period of June 10, 2026 through July 10, 2026, and will not be accepted during this review period. You can access the documents on DEC’s Wastewater Discharge Authorization Program webpage at https://dec.alaska.gov/water/wastewater . DEC Contact : Amy Wockenfuss at [(907) 269-8874], amy.wockenfuss@alaska.gov Preliminary Draft General Permit Review Period : Start Date : July 20, 2026 End Date : July 24, 2026 11:59 pm AKDT Permit No : AK0043354 Proposed Permit Coverage: The proposed permit is a reissue covering the discharge for Kuparuk Seawater Treatment Plant into Simpson Lagoon, Beaufort Sea. The facility is located on the mainland shoreline at Olitok Point at the western end of Simpson Lagoon and the eastern side of Harrison Bay in the Beaufort Sea and functions as a treatment and distribution point for waterflood used to maintain formation pressures to allow for enhanced oil recovery. The discharge will be permitted to occur from Outfall 001 – Strainer/Filter Backwash and Outfall 002 – Marine Life Return System Outfall 001 - The discharge of the discharge of Strainer/Filter Backwash includes the authorization of a chronic mixing zone for change in temperature (ΔT) and total residual chlorine (TRC) and a acute mixing zone for TRC. Outfall 002 – The discharge of the discharge of Marine Life Return System includes the authorization of a chronic mixing zone for TRC. Administrative Record : The APDES preliminary draft permit, fact sheet, and associated documents are available for public review at the DEC offices located in Anchorage, Fairbanks, Juneau, Soldotna, and Wasilla. Please contact the office of your choice to arrange for hard copies of the documents to be available for your review. 555 Cordova Street; Anchorage , AK 99501; 907-269-6285 610 University Avenue; Fairbanks , AK 99709; 907-451-2100 P.O. Box 1800; Juneau , AK 99811-1800 Location: 410 Willoughby Street, Suite 303; Juneau , AK; 907-465-5300 43335 Kalifornsky Beach Road; Soldotna , AK 99615; 907-262-5210 1700 E Bogard Road #B, Suite #103; Wasilla , AK 99654; 907-376-1850 If you would like to see any additional supporting technical documents, contact Amy Wockenfuss. Disability Reasonable Accommodation Notice: The State of Alaska, Department of Environmental Conservation, complies with Title II of the Americans with Disabilities Act (ADA) of 1990. If you are a person with a disability who may need special accommodation in order to participate in this public process, please contact ADA Coordinator Kristin Mabry, kristin.mabry@alaska.gov , 1-907-334-0884; or TDD Relay Service 1-800-770-8973/TTY or dial 711 at least 3 days prior to the expiration/closure date of this public notice to ensure that any necessary accommodations can be provided. Attachments, History, Details Attachments None Revision History Created 7/17/2026 3:42:10 PM by jfrintala

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  amy.wockenfuss@alaska.gov