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Underground Injection Control (UIC)

Public Notice: Proposed UIC Permit for Colville River Unit, North Slope, Alaska

Publish Date: 02/01/2019


On Nov. 29, 2018, the EPA published a draft permit and fact sheet for public comment relating to the reissuance of EPA UIC Permit AK-1I003-C. These documents incorrectly set the maximum allowable injection pressure for the permitted injection well(s) at 3200 psi. The maximum allowable injection pressure for the permitted well(s) will be 3500 psi. This correction has been made in the draft permit and fact sheet (see Related Documents below). The public comment period has been reopened to solicit comments on this correction.

The EPA is proposing to reissue an Underground Injection Control (UIC) permit which authorizes the operation of up to three Class I non-hazardous industrial waste injection wells at the Colville River Unit, North Slope, Alaska.

The EPA has direct implementation responsibility in Alaska for the regulation of Class I injection wells through the UIC  program, authorized by Part C of the Safe Drinking Water Act. Class I injection wells dispose of fluids beneath any aquifers which could serve as current or future underground sources of drinking water (USDWs).

Wastes allowed for injection include: treated domestic wastewater, drilling muds and cuttings, well workover fluids, melt and storm water, facility water, production water and other exempt and non-exempt non-hazardous fluids.

The EPA has authorized ConocoPhillips Alaska, Inc. to construct and operate Class I non-hazardous injection wells at the Colville River Unit on Alaska’s North Slope through Permit AK-1I003-A (issued February 2, 1999), and Permit AK-1I003-B (issued February 2, 2009).

The EPA proposes to reissue this permit for another 10 years after the current permit expires on February 2, 2019.

Injection is permitted only into the Sag River and Ivishak formations below an impervious confining zone at greater than 8500 feet true vertical depth. The EPA has previously determined that the aquifers affected by this injection do not qualify as USDWs due to their high natural salinity.

Tentative Determination

The EPA has tentatively determined to reissue a 10-year UIC permit to the applicant.

Administrative Record

Electronic copies of the draft permit and fact sheet are available under "Related Documents" below.

Copies of documents, including the permit application, are also available upon request to Ryan Gross (, 206-553-6293

Applicant or Respondent

ConocoPhillips Alaska, Inc.
P.O. Box 100360
Anchorage, AK 99510

Permit #: AK1I003-C

Related Documents

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