DWQ-2025-002698

March **, 2025

Division of Water Quality
Utah Department of Environmental Quality
Public Notice of Permit UTU-27-AP-BDCCF0C
Underground Injection Control Class V Well
Permit Modification

Purpose of Public Notice
The Utah Department of Environmental Quality (DEQ) is soliciting comments on the request to modify Underground Injection Control (UIC) Class V Draft permit UTU-27-AP-BDCCF0C. The permit
is issued by the Director of the Division of Water Quality (the “Division”) under authority of the Utah Water Quality Act, Section 19-5-106(g) Utah Code Annotated, and Utah Administrative
Code R317-7. Pursuant to Utah Administrative Code R317-7-13, the Director of the Division will investigate and provide a written response to all citizen complaints duly submitted. In
addition, the Director shall not oppose intervention in any civil or administrative proceeding by any citizen where permissive intervention may be authorized by statute or rule. The
Director will publish notice of and provide at least thirty (30) days of public comment on any proposed settlement of any enforcement action. Utah Administrative Code R317-7-13 can be
viewed at the following internet URL: https://adminrules.utah.gov/public/rule/R317-7/Current%20Rules.

Permit Information

Permittee Name: Advanced Clean Energy Storage I, LLC

Facility Location: Millard County

Mailing Address: 3165 E. Millrock Dr. Suite 330
Holladay, Utah 84121

Advanced Clean Energy Storage I, LLC (ACES I) plans to inject, store, and withdraw hydrogen from underground storage caverns constructed in a tectonically thickened salt body located
approximately 9 miles north of Delta, Utah in Millard County and at depths greater than 3,000 feet below ground surface. The construction of these caverns was permitted by the ACES I
solution mining UIC Class III Permit UTU-27AP-718D759. The operation of the storage caverns is permitted by UIC Class V Permit UTU-27-AP-BDCCF0C. This Permit renewal adjusts some operational
requirements based on geomechanical analyses and updates the subsidence
monitoring plan.

Public Comments
Public comments are invited any time prior to *****. Comments may be mailed to the Division of Water Quality at PO Box 144870, Salt Lake City, UT 84114-4870 or via email to [e-mail].
All comments received prior to close of business on *****, will be considered in the final decision to renew and modify the permit. A public hearing may be held if written requests received
within the first 15 days of this public comment period demonstrate significant public interest and substantive issues exist to warrant a hearing.

Additional Information
Additional information may be obtained by contacting Porter Henze at [phone] or via email at [e-mail] or by writing to the address listed above. The Draft Permit and related
documents are available for review on the Division’s web page at http://www.waterquality.utah.gov/PublicNotices/index.htm.

In compliance with the Americans with Disabilities Act, individuals with special needs (including auxiliary communicative aids and services) should contact the Utah State Accessibility
website at https://www.utah.gov/accessibility.html.