DAQ-2025-001534

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. 800 346-3128
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah

Department of
Environmental Quality

Tim Davis
Interim Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor
DAQC-278-25
Site ID 10123 (B4)

F. Travis Smith
HF Sinclair Woods Cross Refining, LLC
1070 West 500 South
Woods Cross, UT 84087-1442

Dear Mr. Smith:

Re: HF Sinclair Woods Cross Refining, LLC – Testing of Heaters 8H2, 12H1, 20H2, 20H3,
24H1, 25H1, Furnaces 8H2, 24H1, and Boilers #5, #8, #10, and #11 – Protocol Review
and Test Date Confirmation – Davis County

The testing protocol for the HF Sinclair Woods Cross Refining, LLC testing of Heaters 8H2, 12H1,
20H2, 20H3, 24H1, 25H1, Furnaces 8H2, 24H1, and Boilers #5, #8, #10, and #11, dated March 4,
2025, has been reviewed and found acceptable. The agreed upon test dates are April 7-18, 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 director. Any deviation from EPA methods,
DAQ policies, UAQR, and methods approved by the director 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 director.

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

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DAQC-278-25
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

PFM:jl

cc: Davis County Health Department
Alliance Technical Group, LLC
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Paul Morris