DAQ-2024-007759

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-404-24
Site ID 10654 (B4)

Mason Powell
United States Gypsum Company
78 North State
Sigurd, UT 84657

Dear Mr. Powell:

Re: United States Gypsum Company – Crusher Baghouse, Raymond Mill Baghouse, Kettle #1
Baghouse, Kettle #2 Baghouse, Mini Kettle Baghouse, Hot Pit Baghouse, #1 PST
Baghouse, and Dunnage Baghouse – Protocol Review and Test Date Confirmation –
Sevier County, UT

The testing protocol for the Crusher Baghouse, Raymond Mill Baghouse, Kettle #1 Baghouse,
Kettle #2 Baghouse, Mini Kettle Baghouse, Hot Pit Baghouse, #1 PST Baghouse, and Dunnage
Baghouse at United States Gypsum Company Sigurd Plant, received April 24, 2024, has been
reviewed and found acceptable. The agreed upon test dates are the weeks of June 17, 2024, and
June 24, 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.

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DAQC-404-24
Page 2

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

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: Central Utah Public Health Department