Public Notice: Proposed Modification to Underground Injection Control Permit for Colville River Unit, North Slope, Alaska

Summary

EPA is proposing to modify the Class I UIC permit AK-1I003-C in response to an application submitted by ConocoPhillips Alaska, Inc. This permit modification would increase the maximum inner annulus pressure for well CD1-47A from 1,500 pounds per square inch (psi) to 2,000 psi.

Well CD1-47A is an industrial waste injection well supporting the hydrocarbon extraction business operated by ConocoPhillips Alaska, Inc., at the Alpine Field on Alaska's North Slope. 

The permittee has presented evidence that this increased maximum inner annulus pressure limit is within safe and acceptable operating conditions. To ensure the ability to continuously monitor mechanical integrity, the proposed permit modification includes a requirement that the operator maintain a pressure differential between the tubing and inner annulus.

Applicant

ConocoPhillips Alaska, Inc.
P.O. Box 100360
Anchorage, AK 99510
UIC permit number: AK-1I003-C4

Related documents

Copies of the draft permit and fact sheet are available below:

• Draft UIC Permit, Coville River Unit, #AK-1I003-C4 (pdf) (498.91 KB, July 2026)
  Proposed modified permit.
• UIC Permit Fact Sheet, Colville River Unit, #AK1I003-C4 (pdf) (373.88 KB, July 2026)
  Summary of EPA's proposed permit modification.

The entire administrative record, including the materials submitted by the applicant, are available upon request to Evan Osborne (osborne.evan@epa.gov), 206-553-1747. A copy of the current permit is also available.

About EPA's UIC program

Under the authority of the Safe Drinking Water Act, EPA has direct implementation responsibility for Class I UIC wells in Alaska. Class I injection wells are used to dispose of fluids beneath aquifers that could serve as Underground Sources of Drinking Water. Waste injection is one alternative to other fluid management practices, including surface discharge and/or transportation for treatment and disposal. Visit Protecting Underground Sources of Drinking Water from Underground Injection to learn more about EPA's UIC program.