DAQ-2025-002012

DAQE-GN117060001-25

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Mark Hogan
Utah Army National Guard
12953 South Minuteman Drive
G9 – CFMO – ERM
Draper, UT 84020
[e-mail]

Dear Mr. Hogan:

RE: Revocation of Approval Order DAQE-845-97 dated August 29, 1997
Project Number: N117060001

The Utah Division of Air Quality received your request to revoke Approval Order (AO) DAQE-845-97,
dated August 29, 1997, on April 1, 2025. The Utah Army National Guard has requested the
above-referenced AO be revoked and replaced with a Small Source Exemption (SSE) under UAC
R307-401-9. The DAQ has evaluated the request and found the source is eligible for an SSE. The DAQ
has revoked the above-referenced AO effective as of the date of this letter.

As authorized by the Utah Legislature, the fee for revoking an AO is the actual time spent by the review
engineer and all other staff on the project. Payment should be sent to the DAQ upon receipt of the
invoice.

If you have any questions, please contact Katie Andersen, who can be reached at [phone].

Sincerely,
{{$s }}

Bryce C. Bird
Director

BCB:KA:jg

cc: EPA Region 8
{{#d1=date1_es_:signer1:date:format(date, "mmmm d, yyyy")}} {{#s=Sig_es_:signer1:signature}}
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

SPENCER J. COX
Governor
DEIDRE HENDERSON
Lieutenant Governor

Department of
Environmental Quality

Tim Davis
Interim Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

April 9, 2025
Utah Army National Guard
Defense Depot - Ogden
Emergency Generator Emissions Calculations
NOx Emission Factor (lb/HP-hr)3.10E-02 [AP-42, Table 3.3-1, Diesel Fuel]
CO Emission Factor (lb/HP-hr)6.68E-03 [AP-42, Table 3.3-1, Diesel Fuel]
SOx Emission Factor (lb/HP-hr)2.05E-03 [AP-42, Table 3.3-1, Diesel Fuel]
PM10 Emission Factor (lb/HP-hr)2.20E-03 [AP-42, Table 3.3-1, Diesel Fuel]
TOC Emission Factor (lb/HP-hr)2.51E-03 [AP-42, Table 3.3-1, Diesel Fuel]
Source Name
Caterpillar
Engine
Location DDO Bay 1
Rating (kW)345
Rating (HP)463
Fuel Use (gal/hr)26.5
Annual Hours of Operation 30
Fuel Use (gal/yr)795
Tier Level N/A
NOx Emissions (lb/hr)14.35
CO Emissions (lb/hr)3.09
SOx Emissions (lb/hr)0.95
PM10 Emissions (lb/hr)1.02
PM2.5 Emissions (lb/hr)1.02
VOC Emissions (lb/hr)1.16
NOx Emissions (tpy)0.215
CO Emissions (tpy)0.046
SOx Emissions (tpy)0.014
PM10 Emissions (tpy)0.015
PM2.5 Emissions (tpy)0.015
VOC Emissions (tpy)0.017
Notes:
Emissions estimated using factors from AP-42 Table 3.3-1. Fuel Use estimated using data availab
Diesel heat rating 0.1395 MMBtu/gal
Fuel use 3.7 MMBtu/hr
Fuel use 110.9 MMBtu/yr
HAP Emissions
Pollutant

(lb/MMbtu)

(lb/hr)

(lb/year)
Acenaphthene 1.42E-06 5.25E-06 1.57E-04
Acenaphthylene 5.06E-06 1.87E-05 5.61E-04
Acetaldehyde 7.67E-04 2.84E-03 8.51E-02
Acrolein 9.25E-05 3.42E-04 1.03E-02
Anthracene 1.87E-06 6.91E-06 2.07E-04
Benz[a]anthracene 1.68E-06 6.21E-06 1.86E-04
Benzene 9.33E-04 3.45E-03 1.03E-01
Benzo[b]fluoranthene 9.91E-08 3.66E-07 1.10E-05
Benzo[k]fluoranthene 1.55E-07 5.73E-07 1.72E-05
Benzo(g,h,l)perylene 4.89E-07 1.81E-06 5.42E-05
Benzo[a]pyrene 1.88E-07 6.95E-07 2.08E-05
1,3-Butadiene 3.91E-05 1.45E-04 4.34E-03
Dibenz[a,h]anthracene 5.83E-07 2.16E-06 6.47E-05
Fluoranthene 7.61E-06 2.81E-05 8.44E-04
Fluorene 2.92E-05 1.08E-04 3.24E-03
Formaldehyde 1.18E-03 4.36E-03 1.31E-01
Indeno[1,2,3-c,d]pyrene 3.75E-07 1.39E-06 4.16E-05
Naphthalene 8.48E-05 3.13E-04 9.40E-03
Phenanthrene 2.94E-05 1.09E-04 3.26E-03
Pyrene 4.78E-06 1.77E-05 5.30E-04
Toluene 4.09E-04 1.51E-03 4.54E-02
Xylenes - Mixed isomer 2.85E-04 1.05E-03 3.16E-02
Total 1.43E-02 4.30E-01
Notes:
(1) HAP emission factors taken from AP-42 Section 3.3, Tables 3.3-2
(2) HAP emission factors taken from Air Emissions Guide for Air Force Stationary Sources. Table
CO2 73.25 kg/MMBtu 40 CFR 98.33 Tab
CH4 3.00E-03 kg/MMBtu 40 CFR 98.33 Ta
N2O 6.00E-04 kg/MMBtu 40 CFR 98.33 Tab
CO2 Emissions (tpy)

(tpy)

(tpy)

(tpy)
4.48E-03 3.67E-04 7.33E-05 3.55E-02
Notes:
(1) CO2 emission factors and calculations from 40 CFR 98.33
0.43
3-7 HAP Emission Factors for Stationary Compression Ignition ICOM Engines
Response Summary:
The form below will collect the information to start the revocation process. Please fill out the information and a NSR
Engineer will be contacting you with any follow up requirements.

Q2. Company/Owner Information:
Owner Name:Utah Army National Guard
Address 12953 Minuteman Drive
City Draper
State UT
Zip 84020

Q4. Contact Information:
Contact Name:Mark Hogan
Contact email:[e-mail]
Contact phone [phone]

Q3. Permit Information:
Site Name:Defense Depot Ogden - Joint Language Training Center
Site ID:11706
Permit ID: Ex DAQE-
111110001-21 DAQE-845-97

Q9. Is the AO revocation subject to the Oil and Gas PBR Registration? PBR Requirements
No

Q5. Please provide an explanation for the request to revoke your permit
We are replacing this AO with a Small Source Exemption Registration.

Q6. The undersigned acknowledges they are the responsible party to provide DAQ with this information and
authorize DAQ to bill the fee for revoking an AO. As authorized by Utah Legislature, the fee is the time spent
by the Permitting staff.
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Embedded Data:
N/A