DAQ-2025-001533

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-289-25
Site ID 10335 (B4)

Rheannon Schaefer
Tesoro Refining and Marketing Company
474 West 900 North
Salt Lake City, Utah 84103-1425

Dear Ms. Schaefer:

Re: Tesoro Refining and Marketing Company – Fluid Catalytic Cracking Unit (FCCU) Wet
Gas Scrubber (WGS) – Protocol Review and Test Date Confirmation – Salt Lake County

The testing protocol for the Tesoro Refining and Marketing FCCU WGS received March 14,
2025, has been reviewed and found acceptable. The agreed upon test date is May 20, 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-289-25
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 Source Testing, LLC
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Paul Morris