DAQ-2024-010847

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
Printed on 100% recycled paper
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-965-24
Site IDs 101842, 101843 (B4)

Ryan Zillner
Ovintiv USA, Inc.
370 17th Street, Suite 1700
Denver, CO 80202

Dear Mr. Zillner:

Re: Ovintiv USA, Inc. – Colorow East 15-8-4-2 and Knoll 15-9-4-2 – Protocol Review and
Test Date Confirmation – Duchesne County

The testing protocol for four (4) Doosan 21.9L engines at Colorow East 15-8-4-2 and Knoll
15-9-4-2 in Duchesne County, UT, dated September 24, 2024, has been reviewed and found
acceptable. The agreed upon test date is the week of October 28, 2024.

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 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.

" - 1 " * " / Ü Ù Û Ù Û Ý
DAQC-965-24
Page 2

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

Sincerely,

Paul Bushman, Environmental Scientist
Division of Air Quality

PB:jl

cc: TriCounty Health Department