DAQ-2025-000734

195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144820 • Salt Lake City, UT 84114-4820
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
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State of Utah

Department of
Environmental Quality

Kimberly D. Shelley
Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor
DAQC-101-25
Site ID 10346 (B4)

Sean Daly
Kennecott Utah Copper, LLC
4700 Daybreak Parkway
South Jordan, Utah 84044

Dear Mr. Daly:

Re: Kennecott Utah Copper, LLC – Electrolyte Purification Liberator (REF 001) – Protocol
Review and Test Date Confirmation – Salt Lake County

The testing protocol for the Kennecott Utah Copper’s REF 001, dated January 16, 2025, has been
reviewed and found acceptable. The agreed upon test date is February 25, 2025.

Acceptance of a protocol does not relieve the owner/operator and the testing contractor from strict
adherence to all applicable EPA methods, Utah Division of Air Quality (DAQ) policies, Utah Air
Quality Rules (UAQR), and methods approved by the Executive Secretary. Any deviation from
EPA methods, DAQ policies, UAQR, and methods approved by the Executive Secretary must be
addressed separately and express written consent given prior to commencement of testing.

The DAQ requires that all test reports include a statement signed by a responsible official
certifying that:

A. Testing was conducted while the source was operating at the rate and/or conditions
specified in the applicable approval order, operating permit, or federal regulation.

B. During testing, the source combusted fuels, used raw materials, and maintained
process conditions representative of normal operations, and operated under such
other relevant conditions specified by the Executive Secretary.

C. Based on information and belief formed after reasonable inquiry, the statements
and information contained in the report are true, accurate, and complete.

+ 2 / 6 Ü Ú Û Ù Û Þ
DAQC-101-25
Page 2

If you have any questions, call me at [phone] or e-mail me at [e-mail].

Sincerely,

Paul Morris, Environmental Scientist
Division of Air Quality

PM:rh

cc: Salt Lake County Health Department
Alliance Technical Group, LLC
0 ' * - - $ . — ) A H v A ? A D @ C w A G ˜
Paul Morris