DWQ-2025-003125

April 22, 2025

VIA EMAIL
READ RECEIPT REQUESTED

Mr. William Myers, COO of Aces Delta, LLC
Advanced Clean Energy Storage I, LLC 3165 East Millrock Drive, Suite 330
Holladay, Utah 84121

Subject: Minor Modification of Ground Water Discharge Permit - UGW270014 ACES Evaporation Pond

Dear Mr. Myers:

Advanced Clean Energy Storage I, LLC (ACES) requested minor permit modifications to address clerical revisions to language throughout Permit UGW270014 and its associated Statement of
Basis, received by the Division of Water Quality on March 11, 2025. The minor changes requested by ACES have been updated and applied across both Permit UGW270014 and its associated
Statement of Basis.

If you have questions or comments about the permit, please contact Austin Miller at [e-mail] or 385-303-3366.

Sincerely,

John K. Mackey, P.E. Director

AM/DLB/JK

Enclosures (2):
UGW270014 2025 ACES Evaporation Pond Final Permit (DWQ-2025-002820)
UGW270014 2025 ACES Evaporation Pond Final SOB (DWQ-2025-002819)

cc: Via Email w/out Attachments
John Chartier, Central District Engineer
Eric Larsen, Central Utah Health Department

DWQ-2025-003125