DAQ-2025-001954

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-357-25
Site ID 13267 (B4)

Jeffery Cowlishaw
Staker Parson
2350 South 1900 West
Ogden, UT 84401

Dear Mr. Cowlishaw:

Re: Staker Parson Companies – Portable Aggregate Equipment/Gencor 400 TPH HMAP –
Protocol Review and Test Date Confirmation – Duchesne County

The testing protocol for the Gencor 400 TPH HMAP, north on UT Highway 87 from Main Street in
Duchesne, 8300 South in Duchesne County dated April 8, 2025, has been reviewed and found
acceptable. The agreed upon test date is April 29, 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 stating 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-357-25
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:rh

cc: TriCounty Health Department
District Engineer