DAQ-2024-007391

DAQE-AN100080050-24

{{$d1 }}

Doug Jones
Nucor Steel
PO Box 100
Plymouth, UT 84330
[e-mail]

Dear Mr. Jones:

Re: Approval Order: Modification to Approval Order DAQE-AN100080049-22 to Update
Equipment
Project Number: N100080050

The attached Approval Order (AO) is issued pursuant to the Notice of Intent (NOI) received on October
17, 2022. Nucor Steel must comply with the requirements of this AO, all applicable state requirements
(R307), and Federal Standards.

The project engineer for this action is Jon L. Black, who can be contacted at [phone] or
[e-mail]. Future correspondence on this AO should include the engineer's name as well as the
DAQE number shown on the upper right-hand corner of this letter. No public comments were received
on this action.

Sincerely,

{{$s }}

Bryce C. Bird
Director

BCB:JLB:jg

cc: Bear River Health Department
DJ Law, EPA Region 8

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

Kimberly D. Shelley
Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

February 29, 2024

STATE OF UTAH
Department of Environmental Quality
Division of Air Quality

{{#s=Sig_es_:signer1:signature}}
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APPROVAL ORDER
DAQE-AN100080050-24 Modification to
Approval Order DAQE-AN100080049-22 to
Update Equipment

Prepared By
Jon L. Black, Engineer
[phone]
[e-mail]

Issued to:
Nucor Steel

Issued On
{{$d2 }}

Issued By

{{$s }}

Bryce C. Bird
Director
Division of Air Quality

February 29, 2024
TABLE OF CONTENTS

TITLE/SIGNATURE PAGE ....................................................................................................... 1
GENERAL INFORMATION ...................................................................................................... 3
CONTACT/LOCATION INFORMATION ............................................................................... 3
SOURCE INFORMATION ........................................................................................................ 3
General Description ................................................................................................................ 3
NSR Classification .................................................................................................................. 3
Source Classification .............................................................................................................. 3
Applicable Federal Standards ................................................................................................. 4
Project Description.................................................................................................................. 4
SUMMARY OF EMISSIONS .................................................................................................... 5
SECTION I: GENERAL PROVISIONS .................................................................................... 5
SECTION II: PERMITTED EQUIPMENT .............................................................................. 6
SECTION II: SPECIAL PROVISIONS ..................................................................................... 9
PERMIT HISTORY ................................................................................................................... 16
ACRONYMS ............................................................................................................................... 17

DAQE-AN100080050-24
Page 3

GENERAL INFORMATION

CONTACT/LOCATION INFORMATION

Owner Name Source Name
Nucor Steel Nucor Steel

Mailing Address Physical Address
PO Box 100
Plymouth, UT 84330
West Nucor Road
Plymouth, UT 84330

Source Contact UTM Coordinates
Name: Doug Jones 400,539 m Easting
Phone: [phone],637,480 m Northing
Email: [e-mail] Datum NAD83
UTM Zone 12

SIC code 3312 (Steel Works, Blast Furnaces (Including Coke Ovens), & Rolling Mills)

SOURCE INFORMATION
General Description
Nucor Steel (Nucor) operates a minimill in Box Elder County. Shredded metal scrap is melted to create
new steel products. Steel scrap is charged in the electric arc furnace (EAF). The electric charge heats the
scrap until molten. Lime and dolomite are added to the molten steel to react with and float impurities.
These impurities are removed as slag. The refined molten steel is then mixed with alloy elements to
create the desired composition. The steel mixture is run through the caster to produce the desired mold.
The molded slabs or billets are cut to size with gas torches after leaving the caster. The slabs are then sent
to the rolling mill. Slabs are heated in the rolling mill to ensure the steel is malleable enough to be
reduced to the desired thickness. The reheat furnaces are used to reheat cooled billets before further
processing. Nucor is limited to 1.42 million tons of steel production, 8,220 hours per year of melt shop
operations, 2.34 billion scf of natural gas, and 2.8 million gallons per year of propane.

NSR Classification
Minor Modification at Major Source

Source Classification
Located in Salt Lake City UT PM2.5 NAA
Box Elder County
Airs Source Size: A

DAQE-AN100080050-24
Page 4

Applicable Federal Standards
NSPS (Part 60), A: General Provisions
NSPS (Part 60), AAa: Standards of Performance for Steel Plants: Electric Arc Furnaces and
Argon-Oxygen Decarburization Vessels Constructed After August 17, 1983
NSPS (Part 60), IIII: Standards of Performance for Stationary Compression Ignition Internal
Combustion Engines
NSPS (Part 60), JJJJ: Standards of Performance for Stationary Spark Ignition Internal
Combustion Engines
MACT (Part 63), A: General Provisions
MACT (Part 63), ZZZZ: National Emissions Standards for Hazardous Air Pollutants for
Stationary Reciprocating Internal Combustion Engines
MACT (Part 63), YYYYY: National Emission Standards for Hazardous Air Pollutants for
Area Sources: Electric Arc Furnace Steelmaking Facilities
MACT (Part 63), CCCCCC: National Emission Standards for Hazardous Air Pollutants for
Source Category: Gasoline Dispensing Facilities
Title V (Part 70) Major Source

Project Description
Nucor has requested a Modification to AO DAQE-AN10008049-22 dated September 28, 2022, for the
replacement and addition of emergency engine generators and an administrative correction to equipment
II.A.3. In the previous permitting action, all carbon flux injection system references were removed from
II.A.3. However, the previous permitting action was only for the removal on one (1) carbon injection and
flux system. Therefore, this language has been reincorporated to reflect the remaining systems.

Engines previously listed in AO DAQE-AN100080049-22 under II.A.22 and II.A.32 as well as one 66 hp
(36 kW) engine from II.A.21 were removed. These engines (and their spares) are no longer functionally
installed on-site. Two (2) new 900 hp diesel fired emergency generator engines were added in this AO,
DAQE-AN100080050-24.

Nucor requested the following description carry forward in all project descriptions. Nucor's 2013
modification incorporated the review and approval of the following indirect emission sources: The
furnaces and associated support equipment may be adjusted through the installation of eccentric bottom
tap(s); sidewall and door oxygen lance burner technologies, and/or door lancing technologies; alterations
in furnace movements including roof swings and tilt mechanisms; and associated components.
Additional changes reviewed in Nucor's 2013 NOI included water cooling system improvements,
computer control equipment, refractories, alterations to raw material feeds such as alloy addition in wire
and in bulk, and support equipment improvements. Support equipment adjustments include charge
bucket, ladle, crane, electrical transformers, and structure improvements, as well as associated building
adjustments. Nucor projected minimizing lost time associated with equipment breakdowns through
improved maintenance practices associated with the EAFs and casting system.

Adjustments to the EAFs and casting systems, improved maintenance practices to achieve the projected
production rates through a continuous program of construction. The caster and associated equipment will
be adjusted to increase or vary the number of strands to meet this production. Additionally, ladle
handling or manipulation systems; ladle stirring; tundish; slag system; alloy additions; casting speed;
mold size and shape and; liquid steel washout capture systems adjustments to meet the desired production
rate.

DAQE-AN100080050-24
Page 5

SUMMARY OF EMISSIONS

The emissions listed below are an estimate of the total potential emissions from the source. Some
rounding of emissions is possible.

Criteria Pollutant Change (TPY) Total (TPY)
CO2 Equivalent 0 151073.00
Carbon Monoxide -0.16 2993.05
Nitrogen Oxides 0.47 347.32
Particulate Matter 0 235.50
Particulate Matter - PM10 -0.04 266.54
Particulate Matter - PM2.5 -0.04 245.50
Sulfur Dioxide 0.13 253.45
Volatile Organic Compounds 0.11 150.38

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Total HAPs (CAS #THAPS) 0 33820
Change (TPY) Total (TPY)
Total HAPs 0 16.91

SECTION I: GENERAL PROVISIONS

I.1 All definitions, terms, abbreviations, and references used in this AO conform to those used in
the UAC R307 and 40 CFR. Unless noted otherwise, references cited in these AO conditions
refer to those rules. [R307-101]

I.2 The limits set forth in this AO shall not be exceeded without prior approval. [R307-401]

I.3 Modifications to the equipment or processes approved by this AO that could affect the
emissions covered by this AO must be reviewed and approved. [R307-401-1]

I.4 All records referenced in this AO or in other applicable rules, which are required to be kept by
the owner/operator, shall be made available to the Director or Director's representative upon
request, and the records shall include the five-year period prior to the date of the request.
Unless otherwise specified in this AO or in other applicable state and federal rules, records
shall be kept for a minimum of five (5) years. [R307-401-8]

I.5 At all times, including periods of startup, shutdown, and malfunction, owners and operators
shall, to the extent practicable, maintain and operate any equipment approved under this AO,
including associated air pollution control equipment, in a manner consistent with good air
pollution control practice for minimizing emissions. Determination of whether acceptable
operating and maintenance procedures are being used will be based on information available to
the Director which may include, but is not limited to, monitoring results, opacity observations,
review of operating and maintenance procedures, and inspection of the source. All
maintenance performed on equipment authorized by this AO shall be recorded. [R307-401-4]

I.6 The owner/operator shall comply with UAC R307-107. General Requirements: Breakdowns.
[R307-107]

I.7 The owner/operator shall comply with UAC R307-150 Series. Emission Inventories.
[R307-150]

DAQE-AN100080050-24
Page 6

I.8 The owner/operator shall submit documentation of the status of construction or modification to
the Director within 18 months from the date of this AO. This AO may become invalid if
construction is not commenced within 18 months from the date of this AO or if construction is
discontinued for 18 months or more. To ensure proper credit when notifying the Director, send
the documentation to the Director, attn.: NSR Section. [R307-401-18]

SECTION II: PERMITTED EQUIPMENT

II.A THE APPROVED EQUIPMENT

II.A.1 Nucor Plymouth Minimill
Electric Arc Furnace Steel Mill

II.A.2 Melt Shop Equipment and Operations
Melt shop operations include: skull lancing; natural gas-fired horizontal and vertical ladle
preheaters; tundish preheaters; ladle/ tundish demolition, reconstruction, rebricking and torching.

Control: EAF Baghouse

II.A.3 Two (2) Electric Arc Furnaces
Capacity: 65-tons each
Includes: natural gas oxy-fuel fired burners and oxygen lances and flux/carbon addition and
injection systems
Control: EAF baghouse. Direct emission control (DEC) system during melting/refining and by a
canopy evacuation system during charging/tapping.

NSPS Applicability: Subpart AAa

II.A.4 Caster and associated equipment
Continuous casting system with provisions for alloy addition; supplemental oxygen injection
heating; backup alloy stir station; and automatic and manual torching operations to cut billets to
length.

Control: EAF baghouse

II.A.5 Seven (7) Storage silos

A. One (1) EAF Baghouse Material Storage Silo

B. Two (2) Lime/Dolomite Storage Silos
Control: Fabric Filter baghouse(s)

C. Two (2) Carbon Storage Silos
Control: Internal venting; EAF baghouse

D. Two (2) Carbon Process Silos
Control: Baghouse Filter Each

II.A.6 Scrap/scrap substitute handling operations

II.A.7 Slag stockpiles*
*The stockpiles are listed for informational purposes only.

DAQE-AN100080050-24
Page 7

II.A.8 Raw Materials Handling System
Alloy, Coal, and Flux Unloading, Storage, and Charge Bucket Loading

A. Northeast Rail Station

B. Melt Shop Station(s)

II.A.9 Billet reheat furnace #1
Fuel: Natural Gas/Propane
Control: Low-NOx burners
Maximum NOx Burner Rating: 0.090 lb NOx/MMBTU
Capacity: 1320 MMcf/yr

II.A.10 Billet reheat furnace #2
Fuel: Natural Gas/Propane
Control: Ultra-Low NOx burners
Maximum NOx Burner Rating: 0.075 lb NOx/MMBTU
Capacity: 980 MMcf/yr

II.A.11 Water desalination plant
Plant-wide water treatment

II.A.12 Associated mobile equipment*
*This equipment is listed for informational purposes only.

II.A.13 Miscellaneous parts washers

II.A.14 Sandblast station(s)

II.A.15 Six (6) Water Cooling Systems*
*includes one (1) new system with two (2) new cooling towers with 0. 0005% drift eliminators
each
Control: High efficiency drift eliminator Cooling Tower Cells (Each)

II.A.16 Lime, fluorspar, charge carbon, and alloy handling

II.A.17 Miscellaneous Gas-Fired Equipment
Miscellaneous plant-wide natural gas/propane cutting torches and burners
Rating: Less than 1 MMBtu/hour Each

*This equipment is listed for informational purposes only.

II.A.18 Hot steel rolling operations
Control: Internally venting baghouses

II.A.19 Scrap Steel Stockpiles*
*This equipment is listed for informational purposes only.

II.A.20 Fuel Storage Tanks
Contents: Diesel and Gasoline
Capacity: Less than 19,812 gallons
MACT Applicability: Subpart CCCCCC

DAQE-AN100080050-24
Page 8

II.A.21 Two (2) Mold Backup Water Pump Engines
Mold Water Emergency Pump Engine

Fuel: Natural Gas

Spare Mold Water Emergency Pump Engine
Fuel: Natural Gas

NSPS Applicability: Subpart JJJJ
MACT Applicability: Subpart ZZZZ

II.A.22 One (1) Di-ethylene glycol storage tank
Capacity: 12,000 gallons

II.A.23 Paint Dip Line

II.A.24 Roll Mill #1
Roll Mill Heat Retention Boxes
Fuel: Natural Gas

Controls:
Jump Mill Baghouse
Abrasive Saw Shack Baghouse

II.A.25 Unpowered Ladle Stir Stations/Powered LMFs*
Ladle Metallurgy Furnaces (LMFs)
*electric powered

II.A.26 Ladle Vacuum Degasser
Burner rating: 0.005 lb NOx/ton
Control: Flare

II.A.27 EAF hydraulics Engines
Fuel: Natural Gas

II.A.28 Maintenance Building Equipment
Control: Fabrication Shop Baghouse

II.A.29 Three (3) Natural Gas Emergency Generators
Capacities: One (1) - 100 hp or less
Two (2) - 460 hp or less Each
NSPS Applicability: Subpart JJJJ
MACT Applicability: Subpart ZZZZ

II.A.30 One (1) Diesel Emergency Generator
Capacities: 51 hp or less
NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

II.A.31 Reheat Backup Water Pump Engine
Reheat #2 Emergency Cooling Water Pump Engine
Rating: 66 hp (36 kW)
Fuel: Diesel

NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

DAQE-AN100080050-24
Page 9

II.A.32 Six (6) Gasoline Emergency Generators
Capacities: Less than 25hp Each
NSPS Applicability: Subpart JJJJ
MACT Applicability: Subpart ZZZZ

II.A.33 Two (2) Diesel Emergency Generator Engines (NEW)
Capacity: 900hp Each
Fuel: Diesel

NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

SECTION II: SPECIAL PROVISIONS

II.B REQUIREMENTS AND LIMITATIONS

II.B.1 Site-wide Limitations
II.B.1.a The owner/operator shall not exceed 1.42 million tons of steel production per rolling 12-month
period. [R307-401-8]

II.B.1.a.1 To demonstrate compliance, the owner/operator shall maintain a log of monthly production rates.
To determine compliance with a rolling 12-month total, the owner/operator shall calculate a new
12-month total by the 20th day of each month using data from the previous 12 months. Records
of production shall be kept for all periods when the plant is in operation. [R307-401-8]

DAQE-AN100080050-24
Page 10

II.B.1.b The owner/operator shall not allow visible emissions from the following emission points to
exceed the following opacities:

A. Fabrication Shop baghouse - 10%

B. Natural gas-fired generators - 10%

C. Emissions from the shop and due solely to operations of any electric arc
furnaces - 6%

D. Exhaust of the EAF baghouse - less than 3%

E. EAF dust handling equipment - less than 10%

F. Carbon storage silo baghouse exhaust - 10%

G. Lime/dolomite storage silo exhaust - 10%

H. Roll Mill #1 baghouses - 10%

I. Unpaved haul roads and service roads - 20% on site and 10% at the property
boundary

J. Fugitive Emission Sources- 15%

K. Paved haul roads and service roads - 10%

L. Additive (coke breeze, feldspar, alloys, lime, etc.) batching operations - 10%

M. Reheat Furnace #1 and #2 - 10%

N. Sandblasting - 40%

O. All other points - 20%.

[40 CFR 60 Subpart AAa, R307-201, R307-206-4, R307-309-4, R307-309-5, R307-401-8]

II.B.1.b.1 Unless otherwise noted, opacity observations of emissions from stationary sources shall be
conducted according to 40 CFR 60, Appendix A, Method 9.

In lieu of monitoring via visible emission observations for Reheat Furnace #1 and #2, fuel usage
shall be monitored to demonstrate that only natural gas or propane is being used as fuel. Results
of monitoring for Reheat Furnace #1 and #2 shall be maintained in accordance with R307-415-
6a(3)(b). [R307-201, R307-415-6a]

II.B.1.c The owner/operator shall perform visible emission observations of emissions from the EAF
baghouse with a certified observer. Observations shall be conducted at least once per day when
at least one of the furnaces is operating in the melting/refining stage. These observations shall be
taken in accordance with Method 9, and for at least three (3) six-minute periods. Records of
daily observations shall be maintained on site. [R307-401]

DAQE-AN100080050-24
Page 11

II.B.1.c.1 Opacity observations of fugitive dust from intermittent sources shall be conducted according to
40 CFR 60, Appendix A, Method 9; however, the requirement for observations to be made at
15-second intervals over a six-minute period shall not apply. The number of observations and
the time period shall be determined by the length of the intermittent source. For fugitive dust
generated by mobile sources, visible emissions shall be measured at the densest point of the
plume but at a point not less than one-half vehicle length behind the vehicle and not less than
one-half the height of the vehicle. [R307-401-8]

II.B.2 Requirements and Limitations for the Melt Shop
II.B.2.a The owner/operator shall not exceed 8,220 hours of melt shop operation per rolling 12-month
period. [R307-401-8]

II.B.2.a.1 Hours of operation shall be determined by supervisor's monitoring and maintenance of a daily
operations log. Total hours shall be calculated, by the twentieth day of each month. The 12-
month total shall be totaled on the first day of each month using data from the previous 12
months. [R307-401-8]

II.B.2.b The owner/operator shall not allow emissions to the atmosphere from the indicated emission
point(s) to exceed the following rates and concentrations*:

Source: EAF Baghouse

Pollutant lb/hr grains/dscf tons/year
(68F, 29.92 in Hg)

TSP (filterable) 27.0 0.0030
PM10 (filterable) 17.8 0.0018
PM2.5 (filterable, 24-hr ave) 17.4 0.00176
PM2.5 (condensibles, 24-hr ave) 29.53
SO2 (3-hr ave) 93.98
SO2 (24-hr ave) 89.0
SO2 (rolling 12-month total) 245
NOx (rolling 12-month total) 245
CO (1-hr ave) 1,200
CO (8-hr ave) 682.93
CO (rolling 12-month total) 2,800
VOC 22.20

Source: Reheat Furnace #1

Pollutant lb/hr

NOx 15.0

Source: Reheat Furnace #2

Pollutant lb/hr

NOx 8.0

*For particulate emission limits where dual limits are listed, both limits apply.

[R307-401-8]

DAQE-AN100080050-24
Page 12

II.B.2.c The owner/operator shall perform stack testing to demonstrate compliance with the emission
limitations within the following frequencies:

Emissions Point Test
Pollutant Frequency

EAF Baghouse
TSP Every year
PM10 Every year
PM2.5 Every year
PM2.5 Condensable Every year
SO2 CEM
NOx CEM
CO CEM
VOC Every year

Reheat Furnace #1
NOx Every year

Reheat Furnace #2
NOx Every year.

[R307-401-8, SIP Section IX.H.12.k]

DAQE-AN100080050-24
Page 13

II.B.2.c.1 Stack testing shall be performed as outlined below:

A. Testing Status
PM10 and PM2.5 (filterable) compliance may be demonstrated through TSP
testing. If the TSP emissions are below the PM10 and PM2.5 limit, then that will
constitute compliance with the PM10 and PM2.5 limits. If the TSP emissions are
not below the PM10 limit, testing will be required. If required, this test will be
completed within 120 days of the yearly TSP test

B. Notification
The Director shall be notified at least 30 days prior to conducting any required
emission testing. A source test protocol shall be submitted to DAQ when the
testing notification is submitted to the Director

The source test protocol shall be approved by the Director prior to performing
the tests. The source test protocol shall outline the proposed test methodologies,
stack to be tested, and procedures to be used. A pretest conference shall be held,
if directed by the Director.

C. Sample Location
The emission point shall be designed to conform to the requirements of 40 CFR
60, Appendix A, Method 1, or other EPA approved testing methods acceptable
to the Director. An Occupational Safety and Health Administration (OSHA) or
Mine Safety and Health Administration (MSHA) approved access shall be
provided to the test location

D. Volumetric Flow Rate
40 CFR 60, Appendix A, Method 2 or other EPA-approved testing methods
acceptable to the Director

E. TSP
40 CFR 60. Appendix A, Method 5D, or other EPA-approved testing method
acceptable to the Director. The minimum sample time and sample volume shall
be four (4) hours and 160 dscfm

F. PM10
Filterable PM10 40 CFR 51, Appendix M, Method 201; Method 201A; or other
EPA-approved testing method as acceptable to the Director. If other approved
testing methods are used which cannot measure the PM10 fraction of the
filterable particulate emissions, all of the filterable particulate emissions shall be
considered PM10

Condensable
The condensable particulate emissions shall not be used for compliance
demonstration, but shall be used for inventory purposes.

G. PM2.5
Filterable PM2.5 40 CFR 51, Appendix M, Method 201A or other
EPA-approved testing method as acceptable to the Director. If other approved
testing methods are used which cannot measure the PM2.5 fraction of the
filterable particulate emissions, all of the filterable particulate emissions shall be
considered PM2.5

The following methods shall be used to measure condensable particulate
emissions: 40 CFR 51, Appendix M, Method 202, or other EPA-approved
testing method, as acceptable to the Director.

Both the filterable particulate emissions and the condensable particulate
emissions shall be used for compliance demonstration.

H. Nitrogen Oxides (NOx)
40 CFR 60, Appendix A, Method 7, 7A, 7B, 7C, 7D, 7E, or other EPA approved
testing methods acceptable to the Director.

DAQE-AN100080050-24
Page 14

I. Volatile Organic Compounds (VOCs)
VOC emissions shall be determined using 40 CFR 60, App. A, Method 25A
using a flame Ionization analyzer equipped with a methane separator. If such an
analyzer is unavailable, VOC emissions shall be determined simultaneously
using two (2) analyzers, with one configured to read only methane. The
difference between the total organic detector and the methane detector shall
constitute the VOC measurement
or
VOC shall be determined through a combination of 40 CFR 60, App. A, Method
25A and Method 18. The Method 25A flame ionization analyzer, calibrated as
propane, shall measure total hydrocarbons. The owner/operator shall use Tedlar
bags to collect and analyze methane in accordance with 40 CFR 60, App. A-6,
Method 18. Methane shall be subtracted from the total hydrocarbons to
determine the total non-methane VOC emissions.

[R307-165, R307-401-8]

II.B.2.c.2 J. Calculations
To determine mass emission rates (lb/hr, etc.) the pollutant concentration as
determined by the appropriate methods above shall be multiplied by the
volumetric flow rate and any necessary conversion factors determined by the
Director, to give the results in the specified units of the emission limitation

K. Existing Source Operation
For an existing source/emission point, the production rate during all compliance
testing shall be no less than 90% of the maximum production achieved in the
previous three (3) years.

[R307-401-8]

II.B.2.d The owner/operator shall install, calibrate, maintain, and operate a CEM system on EAF
baghouse exhaust stacks. The owner/operator shall record the output of the system, for
measuring the NOx emissions, SO2 emissions, and CO emissions. The monitoring system shall
comply with all applicable sections of R307-170 and 40 CFR 60, Appendix B.

Except for system breakdown, repairs, calibration checks, and zero and span adjustments
required under paragraph (d) 40 CFR 60.13, the owner/operator shall continuously operate all
required continuous monitoring systems and shall meet minimum frequency of operation
requirements as outlined in 40 CFR 60.13 and Section R307-170. [R307-401-8]

II.B.2.e The owner/operator shall comply with the monitoring of operations parameters of 40 CFR §
60.274a. [40 CFR 60 Subpart AAa]

II.B.3 Fuels
II.B.3.a The owner/operator shall use only natural gas or propane as a fuel in the steel making processes.
[R307-401-8]

II.B.3.b The owner/operator shall not exceed the following per rolling 12-month total:

A. 2,340,000,000 scf of natural gas plant-wide, not including fuel consumed by
oxy-fuel burners for the two (2) EAFs

B. 2,800,000 gallons of propane.

[R307-401-8]

DAQE-AN100080050-24
Page 15

II.B.3.b.1 Compliance with the natural gas limitation shall be determined through vendor billing
statements. Records shall include the appropriate conversion of acf to scf, as recommended by
the vendor. Fuel consumed by the EAF oxy-fuel burners may be subtracted. Consumption of
propane shall be determined by records of propane consumed at the steel making plant.
[R307-401-8]

II.B.3.b.2 The owner/operator shall install a meter or meters, which measures the amount of natural gas
consumed by the EAF oxy-fuel burner and a meter, which measures the volume of propane-
consumed plant wide. [R307-401-8]

II.B.3.c The owner/operator shall only combust diesel fuel (fuel oil #1, #2, or diesel fuel oil additives)
that meet the definition of ultra-low sulfur diesel (ULSD), and contain no more than 15 ppm
sulfur on-site. [R307-401-8]

II.B.3.c.1 To demonstrate compliance with the ULSD fuel requirement, the owner/operator shall maintain
records of diesel fuel purchase invoices or obtain certification of sulfur content from the diesel
fuel supplier. The diesel fuel purchase invoices shall indicate that the diesel fuel meets the
ULSD requirements. [R307-401-8]

II.B.4 Roads and Fugitive Dust Requirements and Limitations
II.B.4.a The owner/operator shall water spray and/or chemically treat all unpaved roads and other
unpaved operational areas that are used by mobile equipment to control fugitive dust. Treatment
with water shall be of sufficient frequency and quantity to maintain the surface material in a
damp/moist condition. [R307-401-8]

II.B.4.b The owner/operator shall sweep or water-flush-clean the paved haul roads and operational areas
as needed to maintain the opacity requirements listed in this AO. [R307-401-8]

II.B.4.b.1 Records of chemical, water treatment, and sweeping shall be kept in a log for all periods when
the plant is in operation. Records shall include the following items:

A. Date and time

B. Number and type of treatments made

C. Dilution ratio, if applicable.

[R307-401-8]

II.B.4.c The owner/operator shall not have active exterior coke breeze, and feldspar stockpiles on site.
[R307-401-8]

II.B.4.d The owner/operator shall install and operate water sprays on all conveyor transfer points and
batching equipment drop points. The sprays shall operate to maintain the opacities listed in this
AO. Water spray are not required on enclosed transfer/drop points. [R307-401-8]

II.B.5 VOC Limitations
II.B.5.a The owner/operator shall not emit more than 42.64 tons of VOCs per rolling 12-month period
from evaporative sources (miscellaneous solvent, cleaners (excluding janitorial), painting, and
rolling mill oil and grease) on site. [R307-401-8]

II.B.5.a.1 The owner/operator shall calculate a new 12-month total by the 20th day of each month using
data from the previous 12 months. The plant-wide emissions of VOCs from the solvents,
cleaners, and paints shall be determined through material-use each month and material VOC-
content. The rolling mill VOC calculation shall be determined by the weight of oil and grease
purchased for the rolling mill multiplied by 4.63%. [R307-401-8]

DAQE-AN100080050-24
Page 16

II.B.6 Emergency Generator and Backup Pump Engine Requirements
II.B.6.a The owner/operator shall not operate any emergency generator engine and backup pump engine
on site for more than 100 hours per calendar year for regular maintenance, testing, and other
allowed non-emergency uses listed in 40 CFR 60 Subpart ZZZZ. There is no restriction on use
during emergency situations. [40 CFR 60 Subpart ZZZZ, R307-401-8]

II.B.6.a.1 Compliance shall be determined using the total hours of non-emergency use per calendar year,
totaled at the end of each calendar month. Records documenting the operation of each
emergency engine and backup pump engine shall be kept in a log and shall include the following:

1. The date the engine was used

2. The duration of operation in hours

3. The reason for use.

[40 CFR 60 Subpart ZZZZ, R307-401-8]

II.B.6.a.2 To determine the duration of operation, the owner/operator shall install a non-resettable hour
meter for each emergency engine. [40 CFR 60 Subpart ZZZZ, R307-401-8]

II.B.6.b The owner/operator shall only operate one (1) backup water pump engine (II.A.21 and II.A.31) at
any time. The total backup water pump engines installed shall not exceed three (3) engines.
[R307-401-8]

PERMIT HISTORY

This Approval Order shall supersede (if a modification) or will be based on the following documents:

Supersedes AO DAQE-AN100080049-22 dated September 28, 2022
Is Derived From NOI dated October 17, 2022
Incorporates Additional Information dated May 23, 2023
Incorporates Additional Information dated June 22, 2023
Incorporates Additional Information dated July 11, 2023

DAQE-AN100080050-24
Page 17

ACRONYMS

The following lists commonly used acronyms and associated translations as they apply to this document:

40 CFR Title 40 of the Code of Federal Regulations
AO Approval Order
BACT Best Available Control Technology
CAA Clean Air Act
CAAA Clean Air Act Amendments
CDS Classification Data System (used by Environmental Protection Agency to classify
sources by size/type)
CEM Continuous emissions monitor
CEMS Continuous emissions monitoring system
CFR Code of Federal Regulations
CMS Continuous monitoring system
CO Carbon monoxide
CO2 Carbon Dioxide
CO2e Carbon Dioxide Equivalent - Title 40 of the Code of Federal Regulations Part 98,
Subpart A, Table A-1
COM Continuous opacity monitor
DAQ/UDAQ Division of Air Quality
DAQE This is a document tracking code for internal Division of Air Quality use
EPA Environmental Protection Agency
FDCP Fugitive dust control plan
GHG Greenhouse Gas(es) - Title 40 of the Code of Federal Regulations 52.21 (b)(49)(i)
GWP Global Warming Potential - Title 40 of the Code of Federal Regulations Part 86.1818-
12(a)
HAP or HAPs Hazardous air pollutant(s)
ITA Intent to Approve
LB/YR Pounds per year
MACT Maximum Achievable Control Technology
MMBTU Million British Thermal Units
NAA Nonattainment Area
NAAQS National Ambient Air Quality Standards
NESHAP National Emission Standards for Hazardous Air Pollutants
NOI Notice of Intent
NOx Oxides of nitrogen
NSPS New Source Performance Standard
NSR New Source Review
PM10 Particulate matter less than 10 microns in size
PM2.5 Particulate matter less than 2.5 microns in size
PSD Prevention of Significant Deterioration
PTE Potential to Emit
R307 Rules Series 307
R307-401 Rules Series 307 - Section 401
SO2 Sulfur dioxide
Title IV Title IV of the Clean Air Act
Title V Title V of the Clean Air Act
TPY Tons per year
UAC Utah Administrative Code
VOC Volatile organic compounds

DAQE-IN100080050-23

November 20, 2023

Doug Jones
Nucor Steel
PO Box 100
Plymouth, UT 84330
[e-mail]

Dear Mr. Jones:

Re: Intent to Approve: Modification to Approval Order DAQE-AN100080049-22 to Update
Equipment
Project Number: N100080050

The attached document is the Intent to Approve (ITA) for the above-referenced project. The ITA is
subject to public review. Any comments received shall be considered before an Approval Order (AO) is
issued. The Division of Air Quality is authorized to charge a fee for reimbursement of the actual costs
incurred in the issuance of an AO. An invoice will follow upon issuance of the final AO.

Future correspondence on this ITA should include the engineer's name, Sarah Foran, as well as the
DAQE number as shown on the upper right-hand corner of this letter. Sarah Foran, can be reached at
[phone] or [e-mail], if you have any questions.

Sincerely,

{{$s }}

Jon L. Black, Manager
New Source Review Section

JLB:SF:jg

cc: Bear River Health Department
DJ Law, EPA Region 8

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

Kimberly D. Shelley
Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

* ) ' & — * 1 A G v A ? A B A B w A @ ˜
STATE OF UTAH
Department of Environmental Quality
Division of Air Quality

INTENT TO APPROVE
DAQE-IN100080050-23 Modification to Approval Order
DAQE-AN100080049-22 to Update Equipment

Prepared By
Sarah Foran, Engineer
[phone]
[e-mail]

Issued to
Nucor Steel

Issued On
November 20, 2023

{{$s }}

New Source Review Section Manager
Jon L. Black
{{#s=Sig_es_:signer1:signature}}

* ) ' & — * 1 A G v A ? A B A B w A @ ˜

TABLE OF CONTENTS

TITLE/SIGNATURE PAGE ....................................................................................................... 1
GENERAL INFORMATION ...................................................................................................... 3
CONTACT/LOCATION INFORMATION ............................................................................... 3
SOURCE INFORMATION ........................................................................................................ 3
General Description ................................................................................................................ 3
NSR Classification .................................................................................................................. 3
Source Classification .............................................................................................................. 3
Applicable Federal Standards ................................................................................................. 3
Project Description.................................................................................................................. 4
SUMMARY OF EMISSIONS .................................................................................................... 5
PUBLIC NOTICE STATEMENT............................................................................................... 5
SECTION I: GENERAL PROVISIONS .................................................................................... 5
SECTION II: PERMITTED EQUIPMENT .............................................................................. 6
SECTION II: SPECIAL PROVISIONS ..................................................................................... 9
PERMIT HISTORY ................................................................................................................... 16
ACRONYMS ............................................................................................................................... 17

DAQE-IN100080050-23
Page 3

GENERAL INFORMATION

CONTACT/LOCATION INFORMATION

Owner Name Source Name
Nucor Steel Nucor Steel

Mailing Address Physical Address
PO Box 100 West Nucor Road
PO Box 100
Plymouth, UT 84330 Plymouth, UT 84330

Source Contact UTM Coordinates
Name Doug Jones 400,539 m Easting
Phone [phone],637,480 m Northing
Email [e-mail] Datum NAD83
UTM Zone 12

SIC code 3312 (Steel Works, Blast Furnaces (Including Coke Ovens), & Rolling Mills)

SOURCE INFORMATION
General Description
Nucor Steel (Nucor) operates a minimill in Box Elder County. Shredded metal scrap is melted to create
new steel products. Steel scrap is charged in the electric arc furnace (EAF). The electric charge heats the
scrap until molten. Lime and dolomite are added to the molten steel to react with and float impurities.
These impurities are removed as slag. The refined molten steel is then mixed with alloy elements to
create the desired composition. The steel mixture is run through the caster to produce the desired mold.
The molded slabs or billets are cut to size with gas torches after leaving the caster. The slabs are then sent
to the rolling mill. Slabs are heated in the rolling mill to ensure the steel is malleable enough to be
reduced to the desired thickness. The reheat furnaces are used to reheat cooled billets before further
processing. Nucor is limited to 1.42 million tons of steel production, 8,220 hours per year of melt shop
operations, 2.34 billion scf of natural gas, and 2.8 million gallons per year of propane.
NSR Classification
Minor Modification at Major Source

Source Classification
Located in Salt Lake City UT PM2.5 NAA
Box Elder County
Airs Source Size: A

Applicable Federal Standards
NSPS (Part 60), A: General Provisions
NSPS (Part 60), AAa: Standards of Performance for Steel Plants: Electric Arc Furnaces and
Argon-Oxygen Decarburization Vessels Constructed After August 17, 1983
NSPS (Part 60), IIII: Standards of Performance for Stationary Compression Ignition Internal
DAQE-IN100080050-23
Page 4

Combustion Engines
NSPS (Part 60), JJJJ: Standards of Performance for Stationary Spark Ignition Internal
Combustion Engines
MACT (Part 63), A: General Provisions
MACT (Part 63), ZZZZ: National Emissions Standards for Hazardous Air Pollutants for
Stationary Reciprocating Internal Combustion Engines
MACT (Part 63), YYYYY: National Emission Standards for Hazardous Air Pollutants for
Area Sources: Electric Arc Furnace Steelmaking Facilities
MACT (Part 63), CCCCCC: National Emission Standards for Hazardous Air Pollutants for
Source Category: Gasoline Dispensing Facilities
Title V (Part 70) Major Source

Project Description
Nucor has requested a Modification to AO DAQE-AN10008049-22 dated September 28, 2022, for the
replacement and addition of emergency engine generators and an administrative correction to equipment
II.A.3. In the previous permitting action, all carbon flux injection system references were removed from
II.A.3. However, the previous permitting action was only for the removal on one carbon injection and
flux system. Therefore, this language has been reincorporated to reflect the remaining systems.

Regarding the engine updates, engines previously listed under II.A.32 and II.A.22 were removed. As was
the 66 hp engine from II.A.21. These engines are no longer on-site. Two new 900 hp diesel fired
emergency generator engines were added.

Nucor requested the following description carry forward in all project descriptions. Nucor's 2013
modification incorporated the review and approval of the following indirect emission sources: The
furnaces and associated support equipment may be adjusted through the installation of eccentric bottom
tap(s); sidewall and door oxygen lance burner technologies, and/or door lancing technologies; alterations
in furnace movements including roof swings and tilt mechanisms; and associated components.
Additional changes reviewed in Nucor's 2013 NOI included water cooling system improvements,
computer control equipment, refractories, alterations to raw material feeds such as alloy addition in wire
and in bulk, and support equipment improvements. Support equipment adjustments include charge
bucket, ladle, crane, electrical transformers, and structure improvements, as well as associated building
adjustments. Nucor projected minimizing lost time associated with equipment breakdowns through
improved maintenance practices associated with the EAFs and casting system.

Adjustments to the EAFs and casting systems, improved maintenance practices to achieve the projected
production rates through a continuous program of construction. The caster and associated equipment will
be adjusted to increase or vary the number of strands to meet this production. Additionally, ladle
handling or manipulation systems; ladle stirring; tundish; slag system; alloy additions; casting speed;
mold size and shape and; liquid steel washout capture systems adjustments to meet the desired production
rate.

DAQE-IN100080050-23
Page 5

SUMMARY OF EMISSIONS

The emissions listed below are an estimate of the total potential emissions from the source. Some
rounding of emissions is possible.

Criteria Pollutant Change (TPY) Total (TPY)
CO2 Equivalent 0 151073.00
Carbon Monoxide -0.16 2993.05
Nitrogen Oxides 0.47 347.32
Particulate Matter 0 235.50
Particulate Matter - PM10 -0.04 266.54
Particulate Matter - PM2.5 -0.04 245.50
Sulfur Dioxide 0.13 253.45
Volatile Organic Compounds 0.11 150.38

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Total HAPs (CAS #THAPS) 0 33820
Change (TPY) Total (TPY)
Total HAPs 0 16.91

PUBLIC NOTICE STATEMENT

The NOI for the above-referenced project has been evaluated and has been found to be consistent with the
requirements of UAC R307. Air pollution producing sources and/or their air control facilities may not be
constructed, installed, established, or modified prior to the issuance of an AO by the Director.

A 30-day public comment period will be held in accordance with UAC R307-401-7. A notification of the
intent to approve will be published in the Box Elder News & Journal on November 22, 2023. During the
public comment period the proposal and the evaluation of its impact on air quality will be available for
the public to review and provide comment. If anyone so requests a public hearing within 15 days of
publication, it will be held in accordance with UAC R307-401-7. The hearing will be held as close as
practicable to the location of the source. Any comments received during the public comment period and
the hearing will be evaluated. The proposed conditions of the AO may be changed as a result of the
comments received.

SECTION I: GENERAL PROVISIONS

The intent is to issue an air quality AO authorizing the project with the following recommended
conditions and that failure to comply with any of the conditions may constitute a violation of the AO.

I.1 All definitions, terms, abbreviations, and references used in this AO conform to those used in
the UAC R307 and 40 CFR. Unless noted otherwise, references cited in these AO conditions
refer to those rules. [R307-101]

I.2 The limits set forth in this AO shall not be exceeded without prior approval. [R307-401]

I.3 Modifications to the equipment or processes approved by this AO that could affect the
emissions covered by this AO must be reviewed and approved. [R307-401-1]

DAQE-IN100080050-23
Page 6

I.4 All records referenced in this AO or in other applicable rules, which are required to be kept by
the owner/operator, shall be made available to the Director or Director's representative upon
request, and the records shall include the five-year period prior to the date of the request.
Unless otherwise specified in this AO or in other applicable state and federal rules, records
shall be kept for a minimum of five years. [R307-401-8]

I.5 At all times, including periods of startup, shutdown, and malfunction, owners and operators
shall, to the extent practicable, maintain and operate any equipment approved under this AO,
including associated air pollution control equipment, in a manner consistent with good air
pollution control practice for minimizing emissions. Determination of whether acceptable
operating and maintenance procedures are being used will be based on information available to
the Director which may include, but is not limited to, monitoring results, opacity observations,
review of operating and maintenance procedures, and inspection of the source. All
maintenance performed on equipment authorized by this AO shall be recorded. [R307-401-4]

I.6 The owner/operator shall comply with UAC R307-107. General Requirements: Breakdowns.
[R307-107]

I.7 The owner/operator shall comply with UAC R307-150 Series. Emission Inventories.
[R307-150]

I.8 The owner/operator shall submit documentation of the status of construction or modification to
the Director within 18 months from the date of this AO. This AO may become invalid if
construction is not commenced within 18 months from the date of this AO or if construction is
discontinued for 18 months or more. To ensure proper credit when notifying the Director, send
the documentation to the Director, attn.: NSR Section. [R307-401-18]

SECTION II: PERMITTED EQUIPMENT

The intent is to issue an air quality AO authorizing the project with the following recommended
conditions and that failure to comply with any of the conditions may constitute a violation of the AO.

II.A THE APPROVED EQUIPMENT

II.A.1 Nucor Plymouth Minimill
Electric Arc Furnace Steel Mill

II.A.2 Melt Shop Equipment and Operations
Melt shop operations include: skull lancing; natural gas-fired horizontal and vertical ladle
preheaters; tundish preheaters; ladle/ tundish demolition, reconstruction, rebricking and torching.

Control: EAF Baghouse

II.A.3 Two (2) Electric Arc Furnaces (EAF)
Capacity: 65-tons Each
Includes: natural gas oxy-fuel fired burners and oxygen lances and flux/carbon addition and
injection systems
Control: EAF baghouse. Direct emission control (DEC) system during melting/refining and by a
canopy evacuation system during charging/tapping.

NSPS Applicability: Subpart AAa

DAQE-IN100080050-23
Page 7

II.A.4 Caster and associated equipment
Continuous casting system with provisions for alloy addition; supplemental oxygen injection
heating; backup alloy stir station; and automatic and manual torching operations to cut billets to
length.

Control: EAF baghouse

II.A.5 Seven (7) Storage silos

A. One (1) EAF Baghouse Material Storage Silo

B. Two (2) Lime/Dolomite Storage Silos
Control: Fabric Filter baghouse(s)

C. Two (2) Carbon Storage Silos
Control: Internal venting; EAF baghouse

D. Two (2) Carbon Process Silos
Control: Baghouse Filter Each

II.A.6 Scrap/scrap substitute handling operations

II.A.7 Slag stockpiles*
*The stockpiles are listed for informational purposes only

II.A.8 Raw Materials Handling System
Alloy, Coal, and Flux Unloading, Storage, and Charge Bucket Loading

A. Northeast Rail Station

B. Melt Shop Station(s)

II.A.9 Billet reheat furnace #1
Fuel: Natural Gas/Propane
Control: Low-NOx burners
Maximum NOx Burner Rating: 0.090 lb NOx/MMBTU
Capacity: 1320 MMcf/yr

II.A.10 Billet reheat furnace #2
Fuel: Natural Gas/Propane
Control: Ultra-Low NOx burners
Maximum NOx Burner Rating: 0.075 lb NOx/MMBTU
Capacity: 980 MMcf/yr

II.A.11 Water desalination plant
Plant wide water treatment

II.A.12 Associated mobile equipment*
*This equipment is listed for informational purposes only

II.A.13 Miscellaneous parts washers

II.A.14 Sandblast station(s)

DAQE-IN100080050-23
Page 8

II.A.15 Six (6) Water Cooling Systems*
*includes one (1) new system with two (2) new cooling towers with 0. 0005% drift eliminators
each
Control: High efficiency drift eliminator Cooling Tower Cells (Each)

II.A.16 Lime, fluorspar, charge carbon, and alloy handling

II.A.17 Miscellaneous Gas-Fired Equipment
Miscellaneous plant-wide natural gas/ propane cutting torches and burners
Rating: Less than 1 MMBtu/hour Each

*This equipment is listed for informational purposes only.

II.A.18 Hot steel rolling operations
Control: Internally venting baghouses

II.A.19 Scrap Steel Stockpiles*
*This equipment is listed for informational purposes only.

II.A.20 Fuel Storage Tanks
Contents: Diesel and Gasoline
Capacity: Less than 19,812 gallons
MACT Applicability: Subpart CCCCCC

II.A.21 Two (2) Mold Backup Water Pump Engines
Mold Water Emergency Pump Engine
Fuel: Natural Gas

Spare Mold Water Emergency Pump Engine
Fuel: Natural Gas

NSPS Applicability: Subpart JJJJ
MACT Applicability: Subpart ZZZZ

II.A.22 One (1) Di-ethylene glycol storage tank
Capacity: 12,000 gallons

II.A.23 Paint Dip Line

II.A.24 Roll Mill #1
Roll Mill Heat Retention Boxes
Fuel: Natural Gas
Controls:
Jump Mill Baghouse
Abrasive Saw Shack Baghouse

II.A.25 Unpowered Ladle Stir Stations/Powered LMFs*
Ladle Metallurgy Furnaces (LMFs)
*electric powered

II.A.26 Ladle Vacuum Degasser
Burner rating 0.005 lb NOx/ton
Control: Flare

II.A.27 EAF hydraulics Engines
Fuel: Natural Gas

DAQE-IN100080050-23
Page 9

II.A.28 Maintenance Building Equipment
Control: Fabrication Shop Baghouse

II.A.29 Three (3) Natural Gas Emergency Generators
Capacities: One (1) - 100 hp or less
Two (2) - 460 hp or less Each
NSPS Applicability: Subpart JJJJ
MACT Applicability: Subpart ZZZZ

II.A.30 One Diesel Emergency Generator
Capacities: 51 hp or less
NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

II.A.31 Reheat Backup Water Pump Engine
Reheat #2 Emergency Cooling Water Pump Engine
Rating: 36 kW
Fuel: Diesel

Spare Reheat #2 Emergency Cooling Water Pump
Rating: 36 kW
Fuel: Diesel

NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

II.A.32 Six (6) Gasoline Emergency Generators
Capacities: Less than 25hp Each
NSPS Applicability: Subpart JJJJ
MACT Applicability: Subpart ZZZZ

II.A.33 Two Diesel Emergency Generator Engines (NEW)
Capacity: 900hp Each
Fuel: Diesel

NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

SECTION II: SPECIAL PROVISIONS

The intent is to issue an air quality AO authorizing the project with the following recommended
conditions and that failure to comply with any of the conditions may constitute a violation of the AO.

II.B REQUIREMENTS AND LIMITATIONS

II.B.1 Site-wide Limitations
II.B.1.a The owner/operator shall not exceed 1.42 million tons of steel production per rolling 12-month
period. [R307-401-8]

II.B.1.a.1 To demonstrate compliance, the owner/operator shall maintain a log of monthly production rates.
To determine compliance with a rolling 12-month total, the owner/operator shall calculate a new
12-month total by the 20th day of each month using data from the previous 12 months. Records
of production shall be kept for all periods when the plant is in operation. [R307-401-8]

DAQE-IN100080050-23
Page 10

II.B.1.b The owner/operator shall not allow visible emissions from the following emission points to
exceed the following opacities:

A. Fabrication Shop baghouse - 10%

B. Natural gas-fired generators - 10%

C. Emissions from the shop and due solely to operations of any electric arc furnaces
- 6%

D. Exhaust of the EAF baghouse - less than 3%

E. EAF dust handling equipment - less than 10%

F. Carbon storage silo baghouse exhaust - 10%

G. Lime/dolomite storage silo exhaust - 10%

H. Roll Mill #1 baghouses - 10%

I. Unpaved haul roads and service roads - 20% on site and 10% at the property
boundary

J. Fugitive Emission Sources- 15%

K. Paved haul roads and service roads - 10%

L. Additive (coke breeze, feldspar, alloys, lime, etc.) batching operations - 10%

M. Reheat Furnace #1 and #2 - 10%

N. Sandblasting - 40%

O. All other points - 20%

[40 CFR 60 Subpart AAa, R307-201, R307-206-4, R307-309-4, R307-309-5, R307-401-8]

II.B.1.b.1 Unless otherwise noted, opacity observations of emissions from stationary sources shall be
conducted according to 40 CFR 60, Appendix A, Method 9.

In lieu of monitoring via visible emission observations for Reheat Furnace #1 and #2, fuel usage
shall be monitored to demonstrate that only natural gas or propane is being used as fuel. Results
of monitoring for Reheat Furnace #1 and #2 shall be maintained in accordance with R307-415-
6a(3)(b). [R307-201, R307-415-6a]

II.B.1.c The owner/operator shall perform visible emission observations of emissions from the EAF
baghouse with a certified observer. Observations shall be conducted at least once per day when
at least one of the furnaces is operating in the melting/refining stage. These observations shall be
taken in accordance with Method 9, and for at least three six-minute periods. Records of daily
observations shall be maintained on site. [R307-401]

DAQE-IN100080050-23
Page 11

II.B.1.c.1 Opacity observations of fugitive dust from intermittent sources shall be conducted according to
40 CFR 60, Appendix A, Method 9; however, the requirement for observations to be made at 15-
second intervals over a six-minute period shall not apply. The number of observations and the
time period shall be determined by the length of the intermittent source. For fugitive dust
generated by mobile sources, visible emissions shall be measured at the densest point of the
plume but at a point not less than one-half vehicle length behind the vehicle and not less than
one-half the height of the vehicle. [R307-401-8]

II.B.2 Requirements and Limitations for the Melt Shop
II.B.2.a The owner/operator shall not exceed 8,220 hours of melt shop operation per rolling 12-month
period. [R307-401-8]

II.B.2.a.1 Hours of operation shall be determined by supervisor's monitoring and maintenance of a daily
operations log. Total hours shall be calculated, by the twentieth day of each month. The 12-
month total shall be totaled on the first day of each month using data from the previous 12
months. [R307-401-8]

II.B.2.b The owner/operator shall not allow emissions to the atmosphere from the indicated emission
point(s) to exceed the following rates and concentrations*:

Source: EAF Baghouse

Pollutant lb/hr grains/dscf tons/year
(68F, 29.92 in Hg)

TSP (filterable) 27.0 0.0030
PM10 (filterable) 17.8 0.0018
PM2.5 (filterable, 24-hr ave) 17.4 0.00176
PM2.5 (condensibles, 24-hr ave) 29.53
SO2 (3-hr ave) 93.98
SO2 (24-hr ave) 89.0
SO2 (rolling 12-month total) 245
NOx (rolling 12-month total) 245
CO (1-hr ave) 1,200
CO (8-hr ave) 682.93
CO (rolling 12-month total) 2,800
VOC 22.20

Source: Reheat Furnace #1

Pollutant lb/hr

NOx 15.0

Source: Reheat Furnace #2

Pollutant lb/hr

NOx 8.0
*For particulate emission limits where dual limits are listed, both limits apply.

[R307-401-8]

DAQE-IN100080050-23
Page 12

II.B.2.c The owner/operator shall perform stack testing to demonstrate compliance with the emission
limitations within the following frequencies:

Emissions Point Test
Pollutant Frequency

EAF Baghouse
TSP Every year
PM10 Every year
PM2.5 Every year
PM2.5 Condensable Every year
SO2 CEM
NOx CEM
CO CEM
VOC Every year

Reheat Furnace #1
NOx Every year

Reheat Furnace #2
NOx Every year

[R307-401-8, SIP Section IX.H.12.k]

DAQE-IN100080050-23
Page 13

II.B.2.c.1 Stack testing shall be performed as outlined below:

A. Testing Status
PM10 and PM2.5 (filterable) compliance may be demonstrated through TSP
testing. If the TSP emissions are below the PM10 and PM2.5 limit, then that will
constitute compliance with the PM10 and PM2.5 limits. If the TSP emissions are
not below the PM10 limit, testing will be required. If required, this test will be
completed within 120 days of the yearly TSP test.

B. Notification
The Director shall be notified at least 30 days prior to conducting any required
emission testing. A source test protocol shall be submitted to DAQ when the
testing notification is submitted to the Director.

The source test protocol shall be approved by the Director prior to performing the tests. The
source test protocol shall outline the proposed test methodologies, stack to be tested, and
procedures to be used. A pretest conference shall be held, if directed by the Director.

C. Sample Location
The emission point shall be designed to conform to the requirements of 40 CFR
60, Appendix A, Method 1, or other EPA approved testing methods acceptable
to the Director. An Occupational Safety and Health Administration (OSHA) or
Mine Safety and Health Administration (MSHA) approved access shall be
provided to the test location.

D. Volumetric Flow Rate
40 CFR 60, Appendix A, Method 2 or other EPA-approved testing methods
acceptable to the Director.

E. TSP
40 CFR 60. Appendix A, Method 5D, or other EPA-approved testing method
acceptable to the Director. The minimum sample time and sample volume shall
be four hours and 160 dscfm.

F. PM10
Filterable PM10
40 CFR 51, Appendix M, Method 201; Method
201A; or other EPA-approved testing method as acceptable to the Director. If
other approved testing methods are used which cannot measure the PM10 fraction
of the filterable particulate emissions, all of the filterable particulate emissions
shall be considered PM10.

Condensable
The condensable particulate emissions shall not be used for compliance demonstration, but shall
be used for inventory purposes.

G. PM2.5
Filterable PM2.5
40 CFR 51, Appendix M, Method 201A or other
EPA-approved testing method as acceptable to the Director. If other approved
testing methods are used which cannot measure the PM2.5 fraction of the
filterable particulate emissions, all of the filterable particulate emissions shall be
considered PM2.5.
.
The following methods shall be used to measure condensable particulate emissions: 40 CFR 51,
Appendix M, Method 202, or other EPA-approved testing method, as acceptable to the Director.

Both the filterable particulate emissions and the condensable particulate emissions shall be used
for compliance demonstration.

H. Nitrogen Oxides (NOx)
40 CFR 60, Appendix A, Method 7, 7A, 7B, 7C, 7D, 7E, or other EPA approved
testing methods acceptable to the Director.

DAQE-IN100080050-23
Page 14

I. Volatile Organic Compounds (VOCs)
VOC emissions shall be determined using 40 CFR 60, App. A, Method 25A
using a flame Ionization analyzer equipped with a methane separator. If such an
analyzer is unavailable, VOC emissions shall be determined simultaneously
using two analyzers, with one configured to read only methane. The difference
between the total organic detector and the methane detector shall constitute the
VOC measurement.
or
VOC shall be determined through a combination of 40 CFR 60, App. A, Method
25A and Method 18. The Method 25A flame ionization analyzer, calibrated as
propane, shall measure total hydrocarbons. The owner/operator shall use Tedlar
bags to collect and analyze methane in accordance with 40 CFR 60, App. A-6,
Method 18. Methane shall be subtracted from the total hydrocarbons to
determine the total non-methane VOC emissions.

[R307-165, R307-401-8]

II.B.2.c.2 J. Calculations
To determine mass emission rates (lb/hr, etc.) the pollutant concentration as
determined by the appropriate methods above shall be multiplied by the
volumetric flow rate and any necessary conversion factors determined by the
Director, to give the results in the specified units of the emission limitation.

K. Existing Source Operation
For an existing source/emission point, the production rate during all compliance
testing shall be no less than 90% of the maximum production achieved in the
previous three years.

[R307-401-8]

II.B.2.d The owner/operator shall install, calibrate, maintain, and operate a CEM system on EAF
baghouse exhaust stacks. The owner/operator shall record the output of the system, for
measuring the NOx emissions, SO2 emissions, and CO emissions. The monitoring system shall
comply with all applicable sections of R307-170 and 40 CFR 60, Appendix B.

Except for system breakdown, repairs, calibration checks, and zero and span adjustments
required under paragraph (d) 40 CFR 60.13, the owner/operator shall continuously operate all
required continuous monitoring systems and shall meet minimum frequency of operation
requirements as outlined in 40 CFR 60.13 and Section R307-170. [R307-401-8]

II.B.2.e The owner/operator shall comply with the monitoring of operations parameters of 40 CFR §
60.274a. [40 CFR 60 Subpart AAa]

II.B.3 Fuels
II.B.3.a The owner/operator shall use only natural gas or propane as a fuel in the steel making processes.
[R307-401-8]

II.B.3.b The owner/operator shall not exceed the following per rolling 12-month total:

A. 2,340,000,000 scf of natural gas plant-wide, not including fuel consumed by
oxy-fuel burners for the two EAFs.

B. 2,800,000 gallons of propane.

[R307-401-8]

DAQE-IN100080050-23
Page 15

II.B.3.b.1 Compliance with the natural gas limitation shall be determined through vendor billing
statements. Records shall include the appropriate conversion of acf to scf, as recommended by
the vendor. Fuel consumed by the EAF oxy-fuel burners may be subtracted. Consumption of
propane shall be determined by records of propane consumed at the steel making plant.
[R307-401-8]

II.B.3.b.2 The owner/operator shall install a meter or meters, which measures the amount of natural gas
consumed by the EAF oxy-fuel burner and a meter, which measures the volume of propane-
consumed plant wide. [R307-401-8]

II.B.3.c The owner/operator shall only combust diesel fuel (fuel oil #1, #2, or diesel fuel oil additives)
that meet the definition of ultra-low sulfur diesel (ULSD), and contain no more than 15 ppm
sulfur on-site. [R307-401-8]

II.B.3.c.1 To demonstrate compliance with the ULSD fuel requirement, the owner/operator shall maintain
records of diesel fuel purchase invoices or obtain certification of sulfur content from the diesel
fuel supplier. The diesel fuel purchase invoices shall indicate that the diesel fuel meets the
ULSD requirements. [R307-401-8]

II.B.4 Roads and Fugitive Dust Requirements and Limitations
II.B.4.a The owner/operator shall water spray and/or chemically treat all unpaved roads and other
unpaved operational areas that are used by mobile equipment to control fugitive dust. Treatment
with water shall be of sufficient frequency and quantity to maintain the surface material in a
damp/moist condition. [R307-401-8]

II.B.4.b The owner/operator shall sweep or water-flush-clean the paved haul roads and operational areas
as needed to maintain the opacity requirements listed in this AO. [R307-401-8]

II.B.4.b.1 Records of chemical, water treatment, and sweeping shall be kept in a log for all periods when
the plant is in operation. Records shall include the following items:

A. Date and time

B. Number and type of treatments made

C. Dilution ratio, if applicable.

[R307-401-8]

II.B.4.c The owner/operator shall not have active exterior coke breeze, and feldspar stockpiles on site.
[R307-401-8]

II.B.4.d The owner/operator shall install and operate water sprays on all conveyor transfer points and
batching equipment drop points. The sprays shall operate to maintain the opacities listed in this
AO. Water spray are not required on enclosed transfer/drop points. [R307-401-8]

II.B.5 VOC Limitations
II.B.5.a The owner/operator shall not emit more than 42.64 tons of VOCs per rolling 12-month period
from evaporative sources (miscellaneous solvent, cleaners (excluding janitorial), painting, and
rolling mill oil and grease) on site. [R307-401-8]

II.B.5.a.1 The owner/operator shall calculate a new 12-month total by the 20th day of each month using
data from the previous 12 months. The plant-wide emissions of VOCs from the solvents,
cleaners, and paints shall be determined through material-use each month and material VOC-
content. The rolling mill VOC calculation shall be determined by the weight of oil and grease
purchased for the rolling mill multiplied by 4.63%. [R307-401-8]

DAQE-IN100080050-23
Page 16

II.B.6 Emergency Generator and Backup Pump Engine Requirements
II.B.6.a The owner/operator shall not operate any emergency generator engine and backup pump engine
on site for more than 100 hours per calendar year for regular maintenance, testing, and other
allowed non-emergency uses listed in 40 CFR 60 Subpart ZZZZ. There is no restriction on use
during emergency situations. [40 CFR 60 Subpart ZZZZ, R307-401-8]

II.B.6.a.1 Compliance shall be determined using the total hours of non-emergency use per calendar year,
totaled at the end of each calendar month. Records documenting the operation of each
emergency engine and backup pump engine shall be kept in a log and shall include the following:

1. The date the engine was used

2. The duration of operation in hours

3. The reason for use.

[40 CFR 60 Subpart ZZZZ, R307-401-8]

II.B.6.a.2 To determine the duration of operation, the owner/operator shall install a non-resettable hour
meter for each emergency engine. [40 CFR 60 Subpart ZZZZ, R307-401-8]

II.B.6.b The owner/operator shall only operate one backup water pump engine (II.A.21 and II.A.31) at
any time. The total backup water pump engines installed shall not exceed three engines.
[R307-401-8]

PERMIT HISTORY

This Approval Order shall supersede (if a modification) or will be based on the following documents:

Supersedes AO AN100080049-22 dated September 29, 2022
Is Derived From Notice of Intent dated October 17, 2022
Incorporates Additional Information dated May 23, 2023
Incorporates Additional Information dated June 22, 2023
Incorporates Additional Information dated July 11, 2023

DAQE-IN100080050-23
Page 17

ACRONYMS

The following lists commonly used acronyms and associated translations as they apply to this document:

40 CFR Title 40 of the Code of Federal Regulations
AO Approval Order
BACT Best Available Control Technology
CAA Clean Air Act
CAAA Clean Air Act Amendments
CDS Classification Data System (used by Environmental Protection Agency to classify
sources by size/type)
CEM Continuous emissions monitor
CEMS Continuous emissions monitoring system
CFR Code of Federal Regulations
CMS Continuous monitoring system
CO Carbon monoxide
CO2 Carbon Dioxide
CO2e Carbon Dioxide Equivalent - Title 40 of the Code of Federal Regulations Part 98,
Subpart A, Table A-1
COM Continuous opacity monitor
DAQ/UDAQ Division of Air Quality
DAQE This is a document tracking code for internal Division of Air Quality use
EPA Environmental Protection Agency
FDCP Fugitive dust control plan
GHG Greenhouse Gas(es) - Title 40 of the Code of Federal Regulations 52.21 (b)(49)(i)
GWP Global Warming Potential - Title 40 of the Code of Federal Regulations Part 86.1818-
12(a)
HAP or HAPs Hazardous air pollutant(s)
ITA Intent to Approve
LB/YR Pounds per year
MACT Maximum Achievable Control Technology
MMBTU Million British Thermal Units
NAA Nonattainment Area
NAAQS National Ambient Air Quality Standards
NESHAP National Emission Standards for Hazardous Air Pollutants
NOI Notice of Intent
NOx Oxides of nitrogen
NSPS New Source Performance Standard
NSR New Source Review
PM10 Particulate matter less than 10 microns in size
PM2.5 Particulate matter less than 2.5 microns in size
PSD Prevention of Significant Deterioration
PTE Potential to Emit
R307 Rules Series 307
R307-401 Rules Series 307 - Section 401
SO2 Sulfur dioxide
Title IV Title IV of the Clean Air Act
Title V Title V of the Clean Air Act
TPY Tons per year
UAC Utah Administrative Code
VOC Volatile organic compounds

11/20/23, 12:03 PM State of Utah Mail - Legal Notice to be published November 22, 2023
https://mail.google.com/mail/u/0/?ik=b4fd0e1085&view=pt&search=all&permmsgid=msg-f:1783103452214377014&simpl=msg-f:1783103452214377014 1/2
Jeree Greenwood <[e-mail]>
Legal Notice to be published November 22, 2023
BENJ Legals <[e-mail]>Mon, Nov 20, 2023 at 10:05 AM
To: Jeree Greenwood <[e-mail]>
Jeree,
Your legal notice has been scheduled for November 22.

Thanks,

Erin Young Aho
Legal Notices, Box Elder News Journal

The deadline for legal notices is MONDAY BY NOON prior to Wednesday publication. If there is a Monday holiday, the deadline is
FRIDAY BY NOON.

From: Jeree Greenwood <[e-mail]>
Date: Monday, November 20, 2023 at 7:30 AM
To: BENJ Legals <[e-mail]>
Subject: Legal Notice to be published November 22, 2023
Please publish the following notice on November 22, 2023. And also on Utahlegals.com. If you can, please reply to this email for my confirmation. Jeree -- Jeree Greenwood Office Technician
sophospsmartbannerend
Please publish the following notice on November 22, 2023.
And also on Utahlegals.com.
If you can, please reply to this email for my confirmation.

Jeree

11/20/23, 12:03 PM State of Utah Mail - Legal Notice to be published November 22, 2023
https://mail.google.com/mail/u/0/?ik=b4fd0e1085&view=pt&search=all&permmsgid=msg-f:1783103452214377014&simpl=msg-f:1783103452214377014 2/2
--
Image removed by sender. Division Name
Jeree Greenwood
Office Technician II | Minor NSR Section
M: [phone]
airquality.utah.gov
Image removed by sender.Image removed by sender.

airquality.utah.gov
Image removed by sender.Image removed by sender.

DAQE-NN100080050-23

November 20, 2023

Box Elder News & Journal
Legal Advertising Dept
PO BOX 370
Brigham City, UT 843020370

RE: Legal Notice of Intent to Approve

This letter will confirm the authorization to publish the attached NOTICE in the Box Elder News &
Journal (Account Number: LOC0403) on November 22, 2023.

Please mail the invoice and affidavit of publication to the Utah State Department of Environmental
Quality, Division of Air Quality, P.O. Box 144820, Salt Lake City, Utah 84114-4820. If you have any
questions, contact Jeree Greenwood, who may be reached at [phone].

Sincerely,

{{$s }}

Jeree Greenwood
Office Technician

Enclosure

cc: Box Elder County
cc: Bear River Association of Governments

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

Kimberly D. Shelley
Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

DAQE-NN100080050-23
Page 2
NOTICE

A Notice of Intent for the following project submitted in accordance with R307-401-1, Utah
Administrative Code (UAC), has been received for consideration by the Director:

Company Name: Nucor Steel
Location: Nucor Steel – West Nucor Road, PO Box 100, Plymouth, UT
Project Description: Nucor Steel (Nucor) operates a minimill in Box Elder County. Shredded metal
scrap is melted to create new steel products. Steel scrap is charged in the electric
arc furnace (EAF). Nucor has requested a modification to Approval Order
DAQE-AN10008049-22 dated September 28, 2022, for the removal and addition
of on-site emergency engines.

The completed engineering evaluation and air quality impact analysis showed the proposed project meets
the requirements of federal air quality regulations and the State air quality rules. The Director intends to
issue an Approval Order pending a 30-day public comment period. The project proposal, estimate of the
effect on local air quality and draft Approval Order are available for public inspection and comment at the
Utah Division of Air Quality, 195 North 1950 West, Salt Lake City, UT 84116. Written comments
received by the Division at this same address on or before December 22, 2023 will be considered in
making the final decision on the approval/disapproval of the proposed project. Email comments will also
be accepted at [e-mail]. If anyone so requests to the Director in writing within 15 days of
publication of this notice, a hearing will be held in accordance with R307-401-7, UAC.

Under Section 19-1-301.5, a person who wishes to challenge a Permit Order may only raise an issue or
argument during an adjudicatory proceeding that was raised during the public comment period and was
supported with sufficient information or documentation to enable the Director to fully consider the
substance and significance of the issue.

Date of Notice: November 22, 2023

{{#s=Sig_es_:signer1:signature}}

DAQE-

RN100080050
October 12, 2023

Doug Jones
Nucor Steel
PO Box 100
Plymouth, UT 84330
[e-mail]

Dear Doug Jones,

Re: Engineer Review:
Modification to AO DAQE-AN100080049-22 to Update Equipment
Project Number: N100080050

The DAQ requests a company representative review and sign the attached Engineer Review (ER). This
ER identifies all applicable elements of the New Source Review permitting program. Nucor Steel should
complete this review within 10 business days of receipt.

Nucor Steel should contact Sarah Foran at [phone] if there are questions or concerns with the
review of the draft permit conditions. Upon resolution of your concerns, please email Sarah Foran at
[e-mail] the signed cover letter. Upon receipt of the signed cover letter, the DAQ will prepare
an ITA for a 30-day public comment period. At the completion of the comment period, the DAQ will
address any comments and will prepare an Approval Order (AO) for signature by the DAQ Director.

If Nucor Steel does not respond to this letter within 10 business days, the project will move forward
without source concurrence. If Nucor Steel has concerns that cannot be resolved and the project becomes
stagnant, the DAQ Director may issue an Order prohibiting construction.

Approval Signature _____________________________________________________________
(Signature & Date)

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
Department of
Environmental Quality

Kimberly D. Shelley Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird Director

State of Utah

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 1
UTAH DIVISION OF AIR QUALITY
ENGINEER REVIEW

SOURCE INFORMATION

Project Number N100080050
Owner Name Nucor Steel
Mailing Address PO Box 100
Plymouth, UT, 84330

Source Name Nucor Steel
Source Location West Nucor Rd
PO Box 100
Plymouth, UT 84330

UTM Projection 400,539 m Easting, 4,637,480 m Northing
UTM Datum NAD83
UTM Zone UTM Zone 12
SIC Code 3312 (Steel Works, Blast Furnaces (Including Coke Ovens), &
Rolling Mills)

Source Contact Doug Jones
Phone Number [phone]
Email [e-mail]

Billing Contact Doug Jones
Phone Number 4354582415
Email [e-mail]

Project Engineer Sarah Foran, Engineer
Phone Number [phone]
Email [e-mail]

Notice of Intent (NOI) Submitted October 17, 2022
Date of Accepted Application June 22, 2023

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 2
SOURCE DESCRIPTION

General Description
Nucor Steel (Nucor) operates a minimill in Box Elder County. Shredded metal scrap is melted to
create new steel products. Steel scrap is charged in the electric arc furnace (EAF). The electric
charge heats the scrap until molten. Lime and dolomite are added to the molten steel to react with
and float impurities. These impurities are removed as slag. The refined molten steel is then mixed
with alloy elements to create the desired composition. The steel mixture is run through the caster
to produce the desired mold. The molded slabs or billets are cut to size with gas torches after
leaving the caster. The slabs are then sent to the rolling mill. Slabs are heated in the rolling mill to
ensure the steel is malleable enough to be reduced to the desired thickness. The reheat furnaces
are used to reheat cooled billets before further processing. Nucor is limited to 1.42 million tons of
steel production, 8,220 hours per year of melt shop operations, 2.34 billion scf of natural gas, and
2.8 million gallons per year of propane.

NSR Classification:
Minor Modification at Major Source

Source Classification
Located in , Salt Lake City UT PM2.5 NAA,
Box Elder County
Airs Source Size: A

Applicable Federal Standards
NSPS (Part 60), A: General Provisions
NSPS (Part 60), AAa: Standards of Performance for Steel Plants: Electric Arc Furnaces and
Argon-Oxygen Decarburization Vessels Constructed After August 17, 1983
NSPS (Part 60), IIII: Standards of Performance for Stationary Compression Ignition Internal
Combustion Engines
NSPS (Part 60), JJJJ: Standards of Performance for Stationary Spark Ignition Internal
Combustion Engines
MACT (Part 63), A: General Provisions
MACT (Part 63), ZZZZ: National Emissions Standards for Hazardous Air Pollutants for
Stationary Reciprocating Internal Combustion Engines
MACT (Part 63), YYYYY: National Emission Standards for Hazardous Air Pollutants for
Area Sources: Electric Arc Furnace Steelmaking Facilities
MACT (Part 63), CCCCCC: National Emission Standards for Hazardous Air Pollutants for
Source Category: Gasoline Dispensing Facilities
Title V (Part 70) Major Source

Project Proposal
Modification to AO DAQE-AN100080049-22 to Update Equipment

Project Description
Nucor has requested a Modification to AO DAQE-AN10008049-22 dated September 28, 2022
for the replacement and addition of emergency engine generators and an administrative correction
to equipment II.A.3. In the previous permitting action, all carbon flux injection system references
were removed from II.A.3. However, the previous permitting action was only for the removal on
one carbon injection and flux system. Therefore, this language has been reincorporated to reflect
the remain system.

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 3

Engines previously listed in AO DAQE-AN100080049-22 under II.A.22 and II.A.32 as well as
one 66 hp (36 kW) engine from II.A.21 were removed. These engines (and their spares) are no
longer functionally installed on-site. Two new 900 hp diesel fired emergency generator engines
were added in this AO, DAQE-AN100080050-24.

Nucor requested the following description carry forward in all project descriptions. Nucor's 2013
modification incorporated the review and approval of the following indirect emission sources:
The furnaces and associated support equipment may be adjusted through the installation of
eccentric bottom tap(s); sidewall and door oxygen lance burner technologies, and/or door lancing
technologies; alterations in furnace movements including roof swings and tilt mechanisms; and
associated components. Additional changes reviewed in Nucor's 2013 NOI included water
cooling system improvements, computer control equipment, refractories, alterations to raw
material feeds such as alloy addition in wire and in bulk, and support equipment improvements.
Support equipment adjustments include charge bucket, ladle, crane, electrical transformers, and
structure improvements, as well as associated building adjustments. Nucor projected minimizing
lost time associated with equipment breakdowns through improved maintenance practices
associated with the EAFs and casting system.

Adjustments to the EAFs and casting systems, improved maintenance practices to achieve the
projected production rates through a continuous program of construction. The caster and
associated equipment will be adjusted to increase or vary the number of strands to meet this
production. Additionally, ladle handling or manipulation systems; ladle stirring; tundish; slag
system; alloy additions; casting speed; mold size and shape and; liquid steel washout capture
systems adjustments to meet the desired production rate.

EMISSION IMPACT ANALYSIS
Due to the potential increase in emissions, modeling was completed for NO2 emissions. The results of the
model are available in DAQE- MN100080050A-23 and summarized here:

Air Pollutant Period Prediction (&mu;g/m3) Class II Significant Impact Level (&mu;g/m3)
Background (&mu;g/m3) Nearby Sources (&mu;g/m3) Total NAAQS (&mu;g/m3) Percent
NAAQS

NO2 1-Hour 166.2 7.5 16.9 0.0 183.1 188 97.4%

There are no additional requirements as a result of the model. [Last updated October 12, 2023]

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 4
SUMMARY OF EMISSIONS

The emissions listed below are an estimate of the total potential emissions from the source. Some
rounding of emissions is possible.

Criteria Pollutant Change (TPY) Total (TPY)
CO2 Equivalent 0 151073.00
Carbon Monoxide -0.16 2993.05
Nitrogen Oxides 0.47 347.32
Particulate Matter 0 235.50
Particulate Matter - PM10 -0.04 266.54
Particulate Matter - PM2.5 -0.04 245.50
Sulfur Dioxide 0.13 253.45
Volatile Organic Compounds 0.11 150.38

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Total HAPs (CAS #THAPS) 0 33820
Change (TPY) Total (TPY)
Total HAPs 0 16.91

Note: Change in emissions indicates the difference between previous AO and proposed modification.

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 5
Review of BACT for New/Modified Emission Units

1. BACT review regarding Emergency Engines
The two new diesel fired emergency engines replacements will result in an increase NOx, SO2, and
VOCs. The total increase in emissions, respectively, is 0.47, 0.13, and 0.11 tons per year. Each 900
hp engine is Tier 2 certified. Due to the low use of the engines, and the size of the increase, BACT
for the engines is to maintain visible emissions at or below 20% opacity, the use of ultra low sulfur
diesel fuel and limited operation in non-emergency situations. BACT is covered in conditions
section II.B.6 and condition II.B.1.b of this document. [Last updated October 3, 2023]

SECTION I: GENERAL PROVISIONS

The intent is to issue an air quality AO authorizing the project with the following recommended
conditions and that failure to comply with any of the conditions may constitute a violation of the
AO. (New or Modified conditions are indicated as “New” in the Outline Label):

I.1 All definitions, terms, abbreviations, and references used in this AO conform to those used in
the UAC R307 and 40 CFR. Unless noted otherwise, references cited in these AO conditions
refer to those rules. [R307-101]

I.2 The limits set forth in this AO shall not be exceeded without prior approval. [R307-401]

I.3 Modifications to the equipment or processes approved by this AO that could affect the
emissions covered by this AO must be reviewed and approved. [R307-401-1]

I.4 All records referenced in this AO or in other applicable rules, which are required to be kept by
the owner/operator, shall be made available to the Director or Director's representative upon
request, and the records shall include the five-year period prior to the date of the request.
Unless otherwise specified in this AO or in other applicable state and federal rules, records
shall be kept for a minimum of five (5) years. [R307-401-8]

I.5 At all times, including periods of startup, shutdown, and malfunction, owners and operators
shall, to the extent practicable, maintain and operate any equipment approved under this AO,
including associated air pollution control equipment, in a manner consistent with good air
pollution control practice for minimizing emissions. Determination of whether acceptable
operating and maintenance procedures are being used will be based on information available
to the Director which may include, but is not limited to, monitoring results, opacity
observations, review of operating and maintenance procedures, and inspection of the source.
All maintenance performed on equipment authorized by this AO shall be recorded. [R307-
401-4]

I.6 The owner/operator shall comply with UAC R307-107. General Requirements: Breakdowns.
[R307-107]

I.7 The owner/operator shall comply with UAC R307-150 Series. Emission Inventories. [R307-
150]

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 6
I.8 The owner/operator shall submit documentation of the status of construction or modification
to the Director within 18 months from the date of this AO. This AO may become invalid if
construction is not commenced within 18 months from the date of this AO or if construction is
discontinued for 18 months or more. To ensure proper credit when notifying the Director,
send the documentation to the Director, attn.: NSR Section. [R307-401-18]

SECTION II: PERMITTED EQUIPMENT
The intent is to issue an air quality AO authorizing the project with the following recommended
conditions and that failure to comply with any of the conditions may constitute a violation of the
AO. (New or Modified conditions are indicated as “New” in the Outline Label):

II.A THE APPROVED EQUIPMENT

II.A.1 Nucor Plymouth Minimill
Electric Arc Furnace Steel Mill

II.A.2 Melt Shop Equipment and Operations

Melt shop operations include: skull lancing; natural gas-fired horizontal and vertical ladle
preheaters; tundish preheaters; ladle/ tundish demolition, reconstruction, rebricking and
torching.

Control: EAF Baghouse

II.A.3 Two (2) Electric Arc Furnaces (EAF)
Capacity: 65-tons Each
Includes: natural gas oxy-fuel fired burners and oxygen lances and flux/carbon addition and
injection systems
Control: EAF baghouse. Direct emission control (DEC) system during melting/refining and
by a canopy evacuation system during charging/tapping.

NSPS Applicability: Subpart AAa
II.A.4 Caster and associated equipment

Continuous casting system with provisions for alloy addition; supplemental oxygen injection
heating; backup alloy stir station; and automatic and manual torching operations to cut billets
to length.

Control: EAF baghouse

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 7
II.A.5 Seven (7) Storage silos
A. One (1) EAF Baghouse Material Storage Silo

B. Two (2) Lime/Dolomite Storage Silos
Control: Fabric Filter baghouse(s)

C. Two (2) Carbon Storage Silos
Control: Internal venting; EAF baghouse

D. Two (2) Carbon Process Silos
Control: Baghouse Filter Each

II.A.6 Scrap/scrap substitute handling operations

II.A.7 Slag stockpiles*
*The stockpiles are listed for informational purposes only.

II.A.8 Raw Materials Handling System
Alloy, Coal, and Flux Unloading, Storage, and Charge Bucket Loading

A. Northeast Rail Station

B. Melt Shop Station(s)

II.A.9 Billet reheat furnace #1
Fuel: Natural Gas/Propane
Control: Low-NOx burners
Maximum NOx Burner Rating: 0.090 lb NOx/MMBTU
Capacity: 1320 MMcf/yr

II.A.10 Billet reheat furnace #2
Fuel: Natural Gas/Propane
Control: Ultra-Low NOx burners
Maximum NOx Burner Rating: 0.075 lb NOx/MMBTU
Capacity: 980 MMcf/yr

II.A.11 Water desalination plant
Plant wide water treatment.

II.A.12 Associated mobile equipment*
*This equipment is listed for informational purposes only.

II.A.13 Miscellaneous parts washers

II.A.14 Sandblast station(s)

II.A.15 Six (6) Water Cooling Systems*
*includes one (1) new system with two (2) new cooling towers with 0. 0005% drift
eliminators each
Control: High efficiency drift eliminator Cooling Tower Cells (Each)

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 8
II.A.16 Lime, fluorspar, charge carbon, and alloy handling

II.A.17 Miscellaneous Gas-Fired Equipment
Miscellaneous plant-wide natural gas/ propane cutting torches and burners
Rating: Less than 1 MMBtu/hour Each

*This equipment is listed for informational purposes only.

II.A.18 Hot steel rolling operations
Control: Internally venting baghouses

II.A.19 Scrap Steel Stockpiles*
*This equipment is listed for informational purposes only.

II.A.20 Fuel Storage Tanks
Contents: Diesel and Gasoline
Capacity: Less than 19,812 gallons
MACT Applicability: Subpart CCCCCC

II.A.21 Two (2) Mold Backup Water Pump Engines
Mold Water Emergency Pump Engine
Fuel: Natural Gas

Spare Mold Water Emergency Pump Engine
Fuel: Natural Gas

NSPS Applicability: Subpart JJJJ
MACT Applicability: Subpart ZZZZ

II.A.22 One (1) Di-ethylene glycol storage tank
Capacity: 12,000 gallons
II.A.23 Paint Dip Line

II.A.24 Roll Mill #1
Roll Mill Heat Retention Boxes
Fuel: Natural Gas
Controls:
Jump Mill Baghouse
Abrasive Saw Shack Baghouse

II.A.25 Unpowered Ladle Stir Stations/Powered LMFs*
Ladle Metallurgy Furnaces (LMFs)
*electric powered

II.A.26 Ladle Vacuum Degasser
Burner rating 0.005 lb NOx/ton
Control: Flare

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 9
II.A.27 EAF hydraulics Engines
Fuel: Natural Gas

II.A.28 Maintenance Building Equipment
Control: Fabrication Shop Baghouse

II.A.29 Three (3) Natural Gas Emergency Generators
Capacities: One (1) - 100 hp or less
Two (2) - 460 hp or less Each
NSPS Applicability: Subpart JJJJ
MACT Applicability: Subpart ZZZZ

II.A.30 One Diesel Emergency Generator
Capacities: 51 hp or less
NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

II.A.31
NEW
Reheat Backup Water Pump Engine
Reheat #2 Emergency Cooling Water Pump Engine
Rating: 66 hp (36 kW)
Fuel: Diesel

NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

II.A.32 Six (6) Gasoline Emergency Generators
Capacities: Less than 25hp Each
NSPS Applicability: Subpart JJJJ
MACT Applicability: Subpart ZZZZ

II.A.33
NEW
Two Diesel Emergency Generator Engines (NEW)
Capacity: 900hp Each
Fuel: Diesel

NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

SECTION II: SPECIAL PROVISIONS
The intent is to issue an air quality AO authorizing the project with the following recommended
conditions and that failure to comply with any of the conditions may constitute a violation of the
AO. (New or Modified conditions are indicated as “New” in the Outline Label):

II.B REQUIREMENTS AND LIMITATIONS

II.B.1 Site-wide Limitations
II.B.1.a The owner/operator shall not exceed 1.42 million tons of steel production per rolling 12-
month period. [R307-401-8]

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 10
II.B.1.a.1 To demonstrate compliance, the owner/operator shall maintain a log of monthly production
rates. To determine compliance with a rolling 12-month total, the owner/operator shall
calculate a new 12-month total by the 20th day of each month using data from the previous 12
months. Records of production shall be kept for all periods when the plant is in operation.
[R307-401-8]

II.B.1.b The owner/operator shall not allow visible emissions from the following emission points to
exceed the following opacities:

A. Fabrication Shop baghouse - 10%

B. Natural gas-fired generators - 10%

C. Emissions from the shop and due solely to operations of any electric arc furnaces - 6%

D. Exhaust of the EAF baghouse - less than 3%

E. EAF dust handling equipment - less than 10%

F. Carbon storage silo baghouse exhaust - 10%

G. Lime/dolomite storage silo exhaust - 10%

H. Roll Mill #1 baghouses - 10%

I. Unpaved haul roads and service roads - 20% on site and 10% at the property boundary

J. Fugitive Emission Sources- 15%

K. Paved haul roads and service roads - 10%

L. Additive (coke breeze, feldspar, alloys, lime, etc.) batching operations - 10%

M. Reheat Furnace #1 and #2 - 10%

N. Sandblasting - 40%

O. All other points - 20%. [40 CFR 60 Subpart AAa, R307-201, R307-206-4, R307-309-
4, R307-309-5, R307-401-8]

II.B.1.b.1 Unless otherwise noted, opacity observations of emissions from stationary sources shall be
conducted according to 40 CFR 60, Appendix A, Method 9.

In lieu of monitoring via visible emission observations for Reheat Furnace #1 and #2, fuel
usage shall be monitored to demonstrate that only natural gas or propane is being used as fuel.
Results of monitoring for Reheat Furnace #1 and #2 shall be maintained in accordance with
R307-415-6a(3)(b). [R307-201, R307-415-6a]

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 11
II.B.1.c The owner/operator shall perform visible emission observations of emissions from the EAF
baghouse with a certified observer. Observations shall be conducted at least once per day
when at least one of the furnaces is operating in the melting/refining stage. These
observations shall be taken in accordance with Method 9, and for at least three six-minute
periods. Records of daily observations shall be maintained on site. [R307-401]

II.B.1.c.1 Opacity observations of fugitive dust from intermittent sources shall be conducted according
to 40 CFR 60, Appendix A, Method 9; however, the requirement for observations to be made
at 15-second intervals over a six-minute period shall not apply. The number of observations
and the time period shall be determined by the length of the intermittent source. For fugitive
dust generated by mobile sources, visible emissions shall be measured at the densest point of
the plume but at a point not less than one-half vehicle length behind the vehicle and not less
than one-half the height of the vehicle. [R307-401-8]

II.B.2 Requirements and Limitations for the Melt Shop
II.B.2.a The owner/operator shall not exceed 8,220 hours of melt shop operation per rolling 12-month
period. [R307-401-8]

II.B.2.a.1 Hours of operation shall be determined by supervisor's monitoring and maintenance of a daily
operations log. Total hours shall be calculated, by the twentieth day of each month. The 12-
month total shall be totaled on the first day of each month using data from the previous 12
months. [R307-401-8]

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 12
II.B.2.b The owner/operator shall not allow emissions to the atmosphere from the indicated emission
point(s) to exceed the following rates and concentrations*:

Source: EAF Baghouse

Pollutant lb/hr grains/dscf tons/year
(68F, 29.92 in Hg)

TSP (filterable) 27.0 0.0030
PM10 (filterable) 17.8 0.0018
PM2.5 (filterable, 24-hr ave) 17.4 0.00176
PM2.5 (condensibles, 24-hr ave) 29.53
SO2 (3-hr ave) 93.98
SO2 (24-hr ave) 89.0
SO2 (rolling 12-month total) 245
NOx (rolling 12-month total) 245
CO (1-hr ave) 1,200
CO (8-hr ave) 682.93
CO (rolling 12-month total) 2,800
VOC 22.20

Source: Reheat Furnace #1

Pollutant lb/hr

NOx 15.0

Source: Reheat Furnace #2

Pollutant lb/hr

NOx 8.0
*For particulate emission limits where dual limits are listed, both limits apply. [R307-401-8]

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 13
II.B.2.c The owner/operator shall perform stack testing to demonstrate compliance with the emission
limitations within the following frequencies:

Emissions Point Test
Pollutant Frequency

EAF Baghouse
TSP Every year
PM10 Every year
PM2.5 Every year
PM2.5 Condensable Every year
SO2 CEM
NOx CEM
CO CEM
VOC Every year

Reheat Furnace #1
NOx Every year

Reheat Furnace #2
NOx Every year. [R307-401-8, SIP Section IX.H.12.k]

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 14
II.B.2.c.1
NEW
Stack testing shall be performed as outlined below:
A. Testing Status
PM10 and PM2.5 (filterable) compliance may be demonstrated through TSP testing. If the TSP
emissions are below the PM10 and PM2.5 limit, then that will constitute compliance with the
PM10 and PM2.5 limits. If the TSP emissions are not below the PM10 limit, testing will be
required. If required, this test will be completed within 120 days of the yearly TSP test.
B. Notification
The Director shall be notified at least 30 days prior to conducting any required emission
testing. A source test protocol shall be submitted to DAQ when the testing notification is
submitted to the Director.

The source test protocol shall be approved by the Director prior to performing the tests. The
source test protocol shall outline the proposed test methodologies, stack to be tested, and
procedures to be used. A pretest conference shall be held, if directed by the Director.
C. Sample Location
The emission point shall be designed to conform to the requirements of 40 CFR 60, Appendix
A, Method 1, or other EPA approved testing methods acceptable to the Director. An
Occupational Safety and Health Administration (OSHA) or Mine Safety and Health
Administration (MSHA) approved access shall be provided to the test location.

D. Volumetric Flow Rate
40 CFR 60, Appendix A, Method 2 or other EPA-approved testing methods acceptable to the
Director.

E. TSP
40 CFR 60. Appendix A, Method 5D, or other EPA-approved testing method acceptable to the
Director. The minimum sample time and sample volume shall be four hours and 160 dscfm.

F. PM10
Filterable PM10
40 CFR 51, Appendix M, Method 201; Method
201A; or other EPA-approved testing method as acceptable to the Director. If other
approved testing methods are used which cannot measure the PM10 fraction of the filterable
particulate emissions, all of the filterable particulate emissions shall be considered PM10

Condensable
The condensable particulate emissions shall not be used for compliance demonstration, but
shall be used for inventory purposes.

G. PM2.5
Filterable PM2.5
40 CFR 51, Appendix M, Method 201A or other
EPA-approved testing method as acceptable to the Director. If other approved testing
methods are used which cannot measure the PM2.5 fraction of the filterable particulate
emissions, all of the filterable particulate emissions shall be considered PM2.5.
.
The following methods shall be used to measure condensable particulate emissions: 40 CFR
51, Appendix M, Method 202, or other EPA-approved testing method, as acceptable to the
Director.

Both the filterable particulate emissions and the condensable particulate emissions shall be
used for compliance demonstration.

H. Nitrogen Oxides (NOx)
40 CFR 60, Appendix A, Method 7, 7A, 7B, 7C, 7D, 7E, or other EPA approved testing
methods acceptable to the Director.

I Volatile Organic Compounds (VOCs)

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 15
II.B.2.c.2 J. Calculations

To determine mass emission rates (lb/hr, etc.) the pollutant concentration as determined by the
appropriate methods above shall be multiplied by the volumetric flow rate and any necessary
conversion factors determined by the Director, to give the results in the specified units of the
emission limitation.

K. Existing Source Operation

For an existing source/emission point, the production rate during all compliance testing shall
be no less than 90% of the maximum production achieved in the previous three years. [R307-
401-8]

II.B.2.d The owner/operator shall install, calibrate, maintain, and operate a CEM system on EAF
baghouse exhaust stacks. The owner/operator shall record the output of the system, for
measuring the NOx emissions, SO2 emissions, and CO emissions. The monitoring system
shall comply with all applicable sections of R307-170 and 40 CFR 60, Appendix B.

Except for system breakdown, repairs, calibration checks, and zero and span adjustments
required under paragraph (d) 40 CFR 60.13, the owner/operator shall continuously operate all
required continuous monitoring systems and shall meet minimum frequency of operation
requirements as outlined in 40 CFR 60.13 and Section R307-170. [R307-401-8]

II.B.2.e The owner/operator shall comply with the monitoring of operations parameters of 40 CFR §
60.274a. [40 CFR 60 Subpart AAa]

II.B.3 Fuels
II.B.3.a The owner/operator shall use only natural gas or propane as a fuel in the steel making
processes. [R307-401-8]

II.B.3.b The owner/operator shall not exceed the following per rolling 12-month total:

A. 2,340,000,000 scf of natural gas plant-wide, not including fuel consumed by oxy-fuel
burners for the two EAFs.
B. 2,800,000 gallons of propane. [R307-401-8]

II.B.3.b.1 Compliance with the natural gas limitation shall be determined through vendor billing
statements. Records shall include the appropriate conversion of acf to scf, as recommended by
the vendor. Fuel consumed by the EAF oxy-fuel burners may be subtracted. Consumption of
propane shall be determined by records of propane consumed at the steel making plant.
[R307-401-8]

II.B.3.b.2 The owner/operator shall install a meter or meters, which measures the amount of natural gas
consumed by the EAF oxy-fuel burner and a meter, which measures the volume of propane-
consumed plant wide. [R307-401-8]

II.B.3.c The owner/operator shall only combust diesel fuel (fuel oil #1, #2, or diesel fuel oil additives)
that meet the definition of ultra-low sulfur diesel (ULSD), and contain no more than 15 ppm
sulfur on-site. [R307-401-8]

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 16
II.B.3.c.1 To demonstrate compliance with the ULSD fuel requirement, the owner/operator shall
maintain records of diesel fuel purchase invoices or obtain certification of sulfur content from
the diesel fuel supplier. The diesel fuel purchase invoices shall indicate that the diesel fuel
meets the ULSD requirements. [R307-401-8]

II.B.4 Roads and Fugitive Dust Requirements and Limitations
II.B.4.a The owner/operator shall water spray and/or chemically treat all unpaved roads and other
unpaved operational areas that are used by mobile equipment to control fugitive dust.
Treatment with water shall be of sufficient frequency and quantity to maintain the surface
material in a damp/moist condition. [R307-401-8]

II.B.4.b The owner/operator shall sweep or water-flush-clean the paved haul roads and operational
areas as needed to maintain the opacity requirements listed in this AO. [R307-401-8]

II.B.4.b.1 Records of chemical, water treatment, and sweeping shall be kept in a log for all periods when
the plant is in operation. Records shall include the following items:

A. Date and time

B. Number and type of treatments made

C. Dilution ratio, if applicable. [R307-401-8]

II.B.4.c The owner/operator shall not have active exterior coke breeze, and feldspar stockpiles on site.
[R307-401-8]

II.B.4.d The owner/operator shall install and operate water sprays on all conveyor transfer points and
batching equipment drop points. The sprays shall operate to maintain the opacities listed in
this AO. Water spray are not required on enclosed transfer/drop points. [R307-401-8]

II.B.5 VOC Limitations
II.B.5.a The owner/operator shall not emit more than 42.64 tons of VOCs per rolling 12-month period
from evaporative sources (miscellaneous solvent, cleaners (excluding janitorial), painting, and
rolling mill oil and grease) on site. [R307-401-8]

II.B.5.a.1 The owner/operator shall calculate a new 12-month total by the 20th day of each month using
data from the previous 12 months. The plant-wide emissions of VOCs from the solvents,
cleaners, and paints shall be determined through material-use each month and material VOC-
content. The rolling mill VOC calculation shall be determined by the weight of oil and grease
purchased for the rolling mill multiplied by 4.63%. [R307-401-8]

II.B.6 Emergency Generator and Backup Pump Engine Requirements
II.B.6.a The owner/operator shall not operate any emergency generator engine and backup pump
engine on site for more than 100 hours per calendar year for regular maintenance, testing, and
other allowed non-emergency uses listed in 40 CFR 60 Subpart ZZZZ. There is no restriction
on use during emergency situations. [40 CFR 60 Subpart ZZZZ, R307-401-8]

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 17
II.B.6.a.1 Compliance shall be determined using the total hours of non-emergency use per calendar year,
totaled at the end of each calendar month. Records documenting the operation of each
emergency engine and backup pump engine shall be kept in a log and shall include the
following:

1. The date the engine was used

2. The duration of operation in hours

3. The reason for use

[40 CFR 60 Subpart ZZZZ, R307-401-8]

II.B.6.a.2 To determine the duration of operation, the owner/operator shall install a non-resettable hour
meter for each emergency engine. [40 CFR 60 Subpart ZZZZ, R307-401-8]

II.B.6.b
NEW
The owner/operator shall only operate one backup water pump engine (II.A.21 and II.A.31) at
any time. The total backup water pump engines installed shall not exceed three engines.
[R307-401-8]

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 18
PERMIT HISTORY

When issued, the approval order shall supersede (if a modification) or will be based on the
following documents:

Supersedes DAQE-AN100080049-22 dated September 29, 2022
Is Derived From Notice of Intent dated October 17, 2022
Incorporates Additional Information dated May 23, 2023
Incorporates Additional Information dated June 22, 2023
Incorporates Additional Information dated July 11, 2023

REVIEWER COMMENTS

1. Comment regarding Emission Estimates:
Emission estimates for the new emergency generator engines were based on 100 hours of non-
emergency use per year, and emission factors provided by the manufacturer. Provide emission rates
are as follows per engine: NOx: 12.21 lb/hr; PM10 and PM2.5: 0.13 lb/hr; SO2: 0.00205 lb/hp-hr; CO:
1.71 lb/hr; VOC: 0.03 lb/hr; and CO2: 930 lb/hr. [Last updated October 3, 2023]

2. Comment regarding Modification :
Equipment listed in II.A.3 has been updated to correct an administrative error in the equipment
descriptions. In the previous amendment, all flux/carbon addition and injection systems were
removed from the section, however, the request was only for the removal of the flux system from a
portion of the line. The removal of the flux systems as applied was only in reference to the specific
addition via charge bucket additions. The flux and carbon injection systems that remain are located
inside the furnace still remain and are vital to the steel making process. The wording has been re-
added to II.A.3 to account for the unchanged process.

PTE calculations were clarified in the July 11th, 2023 email from the source.

Emission Unit II.A.31 of AO DAQE-AN100080050-24: The 66 hp (36 kW) Reheat #2 Emergency
Cooling Water Pump Engine will be removed once the 900 hp engines listed in Emission Unit
II.A.33 are installed.

3. Comment regarding NSPS and MACT Applicability:
40 CFR 63 MACT Subpart ZZZZ
National Emissions Standards for Hazardous Air Pollutants (NESHAP) for Stationary Reciprocating
Internal Combustion Engines (RICE) applies to owners and operators RICE engines at a major or
area source of HAP emissions. A stationary RICE located at an area source of HAP emissions is new
if construction of the stationary RICE commenced on or after June 12, 2006. The new emergency
engines will be subject to Subpart ZZZZ.

40 CFR 60 NSPS Subpart IIII
The Standards of Performance for Stationary Compression Ignition Internal Combustion Engines (CI
ICE) applies to owners and operators of stationary CI ICE that commenced construction after July
11, 2005, where the stationary CI ICE are manufactured after April 1, 2006. Owners and operators of
2007 model year and later emergency stationary CI ICE must comply with the emission standards in
40 CFR 60.4205. Subpart IIII applies to the new engines. [Last updated October 3, 2023]

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 19

Engineer Review N100080050: Nucor Steel
October 12, 2023
Page 20
ACRONYMS
The following lists commonly used acronyms and associated translations as they apply to this
document:
40 CFR Title 40 of the Code of Federal Regulations
AO Approval Order
BACT Best Available Control Technology
CAA Clean Air Act
CAAA Clean Air Act Amendments
CDS Classification Data System (used by EPA to classify sources by size/type)
CEM Continuous emissions monitor
CEMS Continuous emissions monitoring system
CFR Code of Federal Regulations
CMS Continuous monitoring system
CO Carbon monoxide
CO2 Carbon Dioxide
CO2e Carbon Dioxide Equivalent - 40 CFR Part 98, Subpart A, Table A-1
COM Continuous opacity monitor
DAQ/UDAQ Division of Air Quality
DAQE This is a document tracking code for internal UDAQ use
EPA Environmental Protection Agency
FDCP Fugitive dust control plan
GHG Greenhouse Gas(es) - 40 CFR 52.21 (b)(49)(i)
GWP Global Warming Potential - 40 CFR Part 86.1818-12(a)
HAP or HAPs Hazardous air pollutant(s)
ITA Intent to Approve
LB/HR Pounds per hour
LB/YR Pounds per year
MACT Maximum Achievable Control Technology
MMBTU Million British Thermal Units
NAA Nonattainment Area
NAAQS National Ambient Air Quality Standards
NESHAP National Emission Standards for Hazardous Air Pollutants
NOI Notice of Intent
NOx Oxides of nitrogen
NSPS New Source Performance Standard
NSR New Source Review
PM10 Particulate matter less than 10 microns in size
PM2.5 Particulate matter less than 2.5 microns in size
PSD Prevention of Significant Deterioration
PTE Potential to Emit
R307 Rules Series 307
R307-401 Rules Series 307 - Section 401
SO2 Sulfur dioxide
Title IV Title IV of the Clean Air Act
Title V Title V of the Clean Air Act
TPY Tons per year
UAC Utah Administrative Code
VOC Volatile organic compounds

Hours of Op 100 hr/yr
Old Engine (replaced)Old Engine (replaced)Removed Engine New Engines
Size (hp)368 66 51 900 (x2)TPY (each)lbs/hr (each)
Nox 0.57 0.10 0.08 1.22 0.61 12.21
PM10 0.04 0.01 0.01 0.01 0.01 0.13
PM2.5 0.04 0.01 0.01 0.01 0.01 0.13
SO2 0.04 0.01 0.01 0.18 0.09 1.845
VOC 0.12 0.02 0.02 0.00 0.00 0.03
CO 0.05 0.01 0.01 0.17 0.09 1.71
Existing PTE New PTE change
Nox 346.85 347.32 0.47
PM10 266.58 266.54 -0.04
PM2.5 245.54 245.50 -0.04
SO2 253.32 253.45 0.13
CO 2993.21 2993.05 -0.16
VOC 150.27 150.38 0.11
CO2 151073 151073 0
Emission lb/hp-hr
Old Engine (replaced)Old Engine (replaced)Removed Engine New Engines
Size 368 48 900 (x2) lb/hr*
Nox 0.031 0.031 0.031 12.21
PM10 0.0022 0.0022 0.0022 0.13
PM2.5 0.0022 0.0022 0.0022 0.13
SO2 0.00205 0.00205 0.00205 0.00205 SO2 is in lb/hp-hr
CO 0.00668 0.00668 0.00668 1.71
VOC 0.00247 0.00247 0.00247 0.03
CO2 1.15 1.15 1.15 930
10/3/23, 11:01 AM State of Utah Mail - Engine identification
https://mail.google.com/mail/u/1/?ik=b363bbe9c3&view=pt&search=all&permmsgid=msg-f:1771130227827711258&simpl=msg-f:1771130227827711258 1/1
Sarah Foran <[e-mail]>
Engine identification
Srymanske, Roy H. (NSUT) <[e-mail]>Tue, Jul 11, 2023 at 7:16 AM
To: "Jones, Doug (NSUT)" <[e-mail]>, Sarah Foran <[e-mail]>
Sara,

Sorry to get back to you so late, I had to do a little bit of digging to answer your question.
In the application we referenced Approval Order DAQE-AN100080043-18, the first page of the attachment is the page
showing the equipment for II.A.23. The second page of the attachment shows the equipment listed in DAQE-
AN100080049-22, this approval order has the individual generators listed out individually. You are correct that we are
replacing II.A.21 and II.A.22 generators.
As for the new generators I did confirm how they will operate. The new generators will be individual operating
engines, one is not a spare.

The generators that we are removing are the II.A.21 generators (66 hp, the generator installed on site is 48 hp) and the
II.A.22 generators (368 hp). Generator II.A.32 can also be removed. It was not installed in the period of time allocated by
the approval order and needs to be removed.

Please let me know if you have any more questions.

Thanks,
Roy
[Quoted text hidden]
Permit Pages.pdf
95K

DAQE-MN100080050A-23

M E M O R A N D U M

TO: Sarah Foran, NSR Engineer

FROM: Jason Krebs, Air Quality Modeler

DATE: July 27, 2022

SUBJECT: Modeling Analysis Review for the Notice of Intent for Nucor Steel – Plymouth Utah
Steel Mill, Box Elder County, Utah
_____________________________________________________________________________________
This is not a Major Prevention of Significant Deterioration (PSD) Source.

I. OBJECTIVE
Nucor Steel (Applicant) is seeking an approval order for their Plymouth Utah Steel Mill located in
Box Elder County, Utah. The applicant seeks approval to replace two existing emergency use
engines with two new emergency use engines.

This report, prepared by the Staff of the New Source Review Section (NSR), contains a review of
the air quality impact analysis (AQIA) including the information, data, assumptions and modeling
results used to determine if the facility will be in compliance with applicable State and Federal
concentration standards.

II. APPLICABLE RULE(S)

Utah Air Quality Rules:

R307-401-6 Condition for Issuing an Approval Order
R307-410-3 Use of Dispersion Models
R307-410-4 Modeling of Criteria Pollutants in Attainment Areas

III. MODELING METHODOLOGY

A. Applicability

Emissions from the facility include PM10, NOx, CO, SO2, and HAPs. This modeling is part of a
modified approval order. The emission rates for NOx triggered the requirement to model under
R307-410. Modeling was performed by the UDAQ.

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

Kimberly D. Shelley
Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

9 ,
JK
DAQE- MN100080050A-23
Page 2
B. Assumptions

1. Topography/Terrain

The Plant is at an elevation 4423 feet with terrain features that have an affect on
concentration predictions.

a. Zone: 12

b. Approximate Location:

UTM (NAD83): 400539 meters East
4637480 meters North

2. Urban or Rural Area Designation

After a review of the appropriate 7.5-minute quadrangles, it was concluded the area is
“rural” for air modeling purposes.

3. Ambient Air

It was determined the Plant boundary used in the AQIA meets the State’s definition of
ambient air.

4. Building Downwash

The source was modeled with the AERMOD model. All structures at the plant were used in
the model to account for their influence on downwash.

5. Meteorology

Five (5) years of off-site surface and upper air data were used in the analysis consisting of
the following:

Surface – Plymouth, UT: May 15, 2007 through May 16, 2008
Upper Air – Salt Lake Airport, UT NWS: May 15, 2007 through May 16, 2008

6. Background

The background concentrations were based on concentrations measured in Washakie, Utah.

7. Receptor and Terrain Elevations

The modeling domain used by the Applicant consisted of receptors including property
boundary receptors. This area of the state contains mountainous terrain and the modeling
domain has simple and complex terrain features in the near and far fields. Therefore,
receptor points representing actual terrain elevations from the area were used in the
analysis.

DAQE- MN100080050A-23
Page 3
8. Model and Options

The State-accepted AERMOD model was used to predict air pollutant concentrations under
a simple/complex terrain/wake effect situation. In quantifying concentrations, the
regulatory default option was selected.

9. Air Pollutant Emission Rates

EMISSIONS
Source
UTM Coordinates Modeled Emission Rates
Easting Northing Nox
(m) (m) (lb/hr) (tons/yr) hrs/year
1 400817 4637415 100.0022 438.010 8760
7 400653 4637297 15.0003 65.701 8760
9 400583 4637327 6.0001 26.281 8760
9A_1 400601 4637314 0.4000 1.752 8760
9A_2 400600 4637300 0.4000 1.752 8760
9A_3 400598 4637284 0.4000 1.752 8760
9A_4 400597 4637261 0.4000 1.752 8760
9A_5 400570 4637264 0.4000 1.752 8760
33_1 400704 4637719 0.2500 1.095 8760
33_2 400704 4637724 0.2500 1.095 8760
11_1 400570 4637264 0.1359 0.595 8760
11_2 400597 4637261 0.1359 0.595 8760
11_3 400615 4637259 0.1359 0.595 8760
11_4 400625 4637259 0.1359 0.595 8760
11_5 400633 4637257 0.1359 0.595 8760
11_6 400643 4637256 0.1359 0.595 8760
11_7 400652 4637255 0.1359 0.595 8760
11_8 400661 4637254 0.1359 0.595 8760
11_9 400679 4637251 0.1359 0.595 8760
11_10 400697 4637249 0.1359 0.595 8760
11_11 400506 4637243 0.1698 0.744 8760
D28 400814 4637190 0.0103 0.045 8760
D29_30 400820 4637189 0.0295 0.129 8760
D31 400833 4637188 0.0138 0.060 8760
D32_33 400857 4637185 0.0290 0.127 8760
D37_38 400864 4637252 0.0348 0.153 8760
D39_41 400822 4637256 0.0523 0.229 8760
VDF 400669 4637210 0.0571 0.250 8760
DAQE- MN100080050A-23
Page 4
NEWGEN1 400734 4637334 12.2001 0.610 100
NEWGEN2 400719 4637336 12.2001 0.610 100

Total 149.6584 549.8511
10. Source Location and Parameters
PARAMETERS
Source Type
Source Parameters
Elev, Ht Temp Flow Dia
(ft) (m) (ft) (K) (m/s) (m)
1 POINT 4433.1 45.7 150.0 344 18.33 6.40
7 POINT 4418.0 38.9 127.5 966 10.17 2.52
9 POINT 4418.0 18.8 61.5 633 4.16 2.13
9A_1 POINT 4418.0 18.6 61.0 305 0.00 0.00
9A_2 POINT 4418.0 18.6 61.0 305 0.00 0.00
9A_3 POINT 4418.0 18.6 61.0 305 0.00 0.00
9A_4 POINT 4418.0 32.0 105.1 305 0.00 0.00
9A_5 POINT 4418.0 32.0 105.1 305 0.00 0.00
33_1 POINT 4418.0 17.1 56.0 922 1.62 0.61
33_2 POINT 4418.0 17.1 56.0 922 1.62 0.61
11_1 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_2 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_3 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_4 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_5 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_6 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_7 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_8 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_9 POINT 4433.1 32.0 105.1 305 4.05 9.97
11_10 POINT 4433.1 26.8 88.0 305 4.05 9.97
11_11 POINT 4418.0 29.0 95.1 305 0.00 0.00
D28 POINT 4433.1 5.3 17.5 305 0.00 0.00
D29_30 POINT 4433.1 7.6 25.0 305 0.00 0.00
D31 POINT 4433.1 6.4 21.0 305 0.00 0.00
D32_33 POINT 4433.1 7.6 25.0 305 0.00 0.00
D37_38 POINT 4433.1 9.0 29.5 305 0.00 0.00
D39_41 POINT 4433.1 9.0 29.5 305 0.00 0.00
VDF POINT 4447.3 32.1 105.1 1273 20.00 1.55
NEWGEN1 POINT 4422.6 2.1 6.9 808 11.15 0.25
DAQE- MN100080050A-23
Page 5
NEWGEN2 POINT 4422.6 2.1 6.9 808 11.15 0.25

IV. RESULTS AND CONCLUSIONS

A. National Ambient Air Quality Standards

The below table provides a comparison of the predicted total air quality concentrations with the
NAAQS. The predicted total concentrations are less than the NAAQS.

RESULTS

Air
Pollutant
Period Prediction Class II
Significant
Impact
Level
Background Nearby
Sources*
Total NAAQS Percent
(μg/m3) (μg/m3) (μg/m3) (μg/m3) (μg/m3) (μg/m3) NAAQS
NO2
1-
Hour 166.2 7.5 16.9 0.0 183.1 188 97.4%

JMK:jg

II.A.a Proposed Gen1

II.A.b Proposed Gen2

DAQE-MN100080050-23

M E M O R A N D U M
TO: Sarah Foran, NSR Engineer FROM: Jason Krebs, Air Quality Modeler DATE: July 18, 2022 SUBJECT: Modeling Analysis Review for the Notice of Intent for Nucor Steel – Plymouth Utah Steel Mill, Box Elder County, Utah _____________________________________________________________________________________
This is not a Major Prevention of Significant Deterioration (PSD) Source. I. OBJECTIVE
Nucor Steel (Applicant) is seeking an approval order for their Plymouth Utah Steel Mill located in
Box Elder County, Utah. The applicant seeks approval to replace two existing emergency use
engines with two new emergency use engines.

This report, prepared by the Staff of the New Source Review Section (NSR), contains a review of
the air quality impact analysis (AQIA) including the information, data, assumptions and modeling
results used to determine if the facility will be in compliance with applicable State and Federal
concentration standards.
II. APPLICABLE RULE(S) Utah Air Quality Rules: R307-401-6 Condition for Issuing an Approval Order R307-410-3 Use of Dispersion Models R307-410-4 Modeling of Criteria Pollutants in Attainment Areas III. MODELING METHODOLOGY A. Applicability Emissions from the facility include PM10, NOx, CO, SO2, and HAPs. This modeling is part of a modified approval order. The emission rates for NOx triggered the requirement to model under R307-410. Modeling was performed by the UDAQ.

B. Assumptions

1. Topography/Terrain
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

Kimberly D. Shelley
Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

SF
SF

DAQE- MN100080050-23
Page 2

The Plant is at an elevation 4423 feet with terrain features that have an affect on
concentration predictions.

a. Zone: 12 b. Approximate Location: UTM (NAD83): 400539 meters East 4637480 meters North 2. Urban or Rural Area Designation After a review of the appropriate 7.5-minute quadrangles, it was concluded the area is “rural” for air modeling purposes. 3. Ambient Air It was determined the Plant boundary used in the AQIA meets the State’s definition of ambient air. 4. Building Downwash The source was modeled with the AERMOD model. All structures at the plant were used in the model to account for their influence on downwash. 5. Meteorology Five (5) years of off-site surface and upper air data were used in the analysis consisting of the following: Surface – Plymouth, UT: May 15, 2007 through May 16, 2008 Upper Air – Salt Lake Airport, UT NWS: May 15, 2007 through May 16, 2008 6. Background
The background concentrations were based on concentrations measured in Harrisville,
Utah. 7. Receptor and Terrain Elevations
The modeling domain used by the Applicant consisted of receptors including property
boundary receptors. This area of the state contains mountainous terrain and the modeling
domain has simple and complex terrain features in the near and far fields. Therefore,
receptor points representing actual terrain elevations from the area were used in the
analysis. 8. Model and Options The State-accepted AERMOD model was used to predict air pollutant concentrations under a simple/complex terrain/wake effect situation. In quantifying concentrations, the regulatory default option was selected.
DAQE- MN100080050-23
Page 3
9. Air Pollutant Emission Rates EMISSIONS
Source
UTM Coordinates Modeled Emission Rates
Easting Northing Nox
(m) (m) (lb/hr) (tons/yr) hrs/year
1 400817 4637415 100.0022 438.010 8760
7 400653 4637297 15.0003 65.701 8760
9 400583 4637327 6.0001 26.281 8760
9A_1 400601 4637314 0.4000 1.752 8760
9A_2 400600 4637300 0.4000 1.752 8760
9A_3 400598 4637284 0.4000 1.752 8760
9A_4 400597 4637261 0.4000 1.752 8760
9A_5 400570 4637264 0.4000 1.752 8760
33_1 400704 4637719 0.2500 1.095 8760
33_2 400704 4637724 0.2500 1.095 8760
11_1 400570 4637264 0.1359 0.595 8760
11_2 400597 4637261 0.1359 0.595 8760
11_3 400615 4637259 0.1359 0.595 8760
11_4 400625 4637259 0.1359 0.595 8760
11_5 400633 4637257 0.1359 0.595 8760
11_6 400643 4637256 0.1359 0.595 8760
11_7 400652 4637255 0.1359 0.595 8760
11_8 400661 4637254 0.1359 0.595 8760
11_9 400679 4637251 0.1359 0.595 8760
11_10 400697 4637249 0.1359 0.595 8760
11_11 400506 4637243 0.1698 0.744 8760
D28 400814 4637190 0.0103 0.045 8760
D29_30 400820 4637189 0.0295 0.129 8760
D31 400833 4637188 0.0138 0.060 8760
D32_33 400857 4637185 0.0290 0.127 8760
D37_38 400864 4637252 0.0348 0.153 8760
D39_41 400822 4637256 0.0523 0.229 8760
VDF 400669 4637210 0.0571 0.250 8760
NEWGEN1 400734 4637334 12.2001 0.610 100
NEWGEN2 400719 4637336 12.2001 0.610 100
Total 149.6584 549.8511
10. Source Location and Parameters
DAQE- MN100080050-23
Page 4
PARAMETERS
Source Type
Source Parameters
Elev, Ht Temp Flow Dia
(ft) (m) (ft) (K) (m/s) (ft)
1 POINT 4433.1 45.7 150.0 344 18.33 6.40
7 POINT 4418.0 38.9 127.5 966 10.17 2.52
9 POINT 4418.0 18.8 61.5 633 4.16 2.13
9A_1 POINT 4418.0 18.6 61.0 305 0.00 0.00
9A_2 POINT 4418.0 18.6 61.0 305 0.00 0.00
9A_3 POINT 4418.0 18.6 61.0 305 0.00 0.00
9A_4 POINT 4418.0 32.0 105.1 305 0.00 0.00
9A_5 POINT 4418.0 32.0 105.1 305 0.00 0.00
33_1 POINT 4418.0 17.1 56.0 922 1.62 0.61
33_2 POINT 4418.0 17.1 56.0 922 1.62 0.61
11_1 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_2 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_3 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_4 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_5 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_6 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_7 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_8 POINT 4418.0 32.0 105.1 305 4.05 9.97
11_9 POINT 4433.1 32.0 105.1 305 4.05 9.97
11_10 POINT 4433.1 26.8 88.0 305 4.05 9.97
11_11 POINT 4418.0 29.0 95.1 305 0.00 0.00
D28 POINT 4433.1 5.3 17.5 305 0.00 0.00
D29_30 POINT 4433.1 7.6 25.0 305 0.00 0.00
D31 POINT 4433.1 6.4 21.0 305 0.00 0.00
D32_33 POINT 4433.1 7.6 25.0 305 0.00 0.00
D37_38 POINT 4433.1 9.0 29.5 305 0.00 0.00
D39_41 POINT 4433.1 9.0 29.5 305 0.00 0.00
VDF POINT 4447.3 32.1 105.1 1273 20.00 1.55
NEWGEN1 POINT 4422.6 2.1 6.9 808 11.15 0.25
NEWGEN2 POINT 4422.6 2.1 6.9 808 11.15 0.25
IV. RESULTS AND CONCLUSIONS
DAQE- MN100080050-23
Page 5
A. National Ambient Air Quality Standards
The below table provides a comparison of the predicted total air quality concentrations with the NAAQS. The predicted total concentrations are less than the NAAQS.

RESULTS
Air Pollutant Period Prediction Class II
Significant
Impact
Level
Background Nearby
Sources*
Total NAAQS Percent
(μg/m3) (μg/m3) (μg/m3) (μg/m3) (μg/m3) (μg/m3) NAAQS
NO2 1-Hour 101.7 7.5 79.4 0.0 181.1 188 96.33%

V. PERMIT CONDITIONS
The following suggested permit language should be included under the Terms and Conditions in the AO:
• The owner/operator shall not operate the emergency generators or backup pump engines before
8:00 am or after 6:00 pm each day for non-emergency uses.
JMK:jg

Utah Division of Air Quality
New Source Review Section Company_______________________
Site/Source_____________________
Form 11 Date___________________________
Internal Combustion Engines

Equipment Information

1. Manufacturer: __________________________

Model no.: __________________________

The date the engine was constructed or
reconstructed ________________________

2. Operating time of Emission Source:
average maximum
______ Hours/day ______ Hours/day
Days/week Days/week
______ Weeks/year ______ Weeks/year

3. Manufacturer's rated output at baseload, ISO hp or Kw
Proposed site operating range _____________________________ hp or Kw

Gas Firing
4. Are you operating site equipment on pipeline quality natural gas: □ Yes □ No

5. Are you on an interruptible gas supply:
□ Yes □ No
If "yes", specify alternate fuel:
_______________________________

6. Annual consumption of fuel:

_____________________________ MMSCF/Year

7. Maximum firing rate:
_____________________________ BTU/hr

8. Average firing rate:
_____________________________ BTU/hr
Oil Firing
9. Type of oil:
Grade number □ 1 □ 2 □ 4 □ 5 □ 6 Other specify ___________

10. Annual consumption: ______________ gallons

11. Heat content:______________ BTU/lb or
______________ BTU/gal

12. Sulfur content:___________% by weight

13. Ash content: ____________% by weight

14. Average firing rate: gal/hr

15. Maximum firing rate: gal/hr

16. Direction of firing: □ horizontal □ tangential □ other: (specify)

Page 1 of 4 

Page 2 of 4 

Internal Combustion Engine
Form 11 (Continued)

Operation

17. Application:
□ Electric generation
______ Base load ______ Peaking
□ Emergency Generator
□ Driving pump/compressor
□ Exhaust heat recovery
□ Other (specify) ________________________

18. Cycle
□ Simple cycle
□ Regenerative cycle
□ Cogeneration
□ Combined cycle
Emissions Data

19. Manufacturer’s Emissions in grams per hour (gr/hp-hr): _______ NOX _______ CO ______ VOC
_______ Formaldehyde

20. Attach manufacturer's information showing emissions of NOx, CO, VOC, SOx, CH2O, PM10, PM 2.5 , CO2, CH4 and N2O
for each proposed fuel at engine loads and site ambient temperatures representative of the range of proposed
operation. The information must be sufficient to determine maximum hourly and annual emission rates. Annual
emissions may be based on a conservatively low approximation of site annual average temperature. Provide emissions
in pounds per hour and except for PM10 and PM2.5 parts per million by volume (ppmv) at actual conditions and corrected
to dry, 15% oxygen conditions.

Method of Emission Control:

□ Lean premix combustors □ Oxidation catalyst □ Water injection □ Other (specify)____________

□ Other low-NOx combustor □ SCR catalyst □ Steam injection

Additional Information

21. On separate sheets provide the following:

A. Details regarding principle of operation of emission controls. If add-on equipment is used, provide make and
model and manufacturer's information. Example details include: controller input variables and operational
algorithms for water or ammonia injection systems, combustion mode versus engine load for variable mode
combustors, etc.

B. Exhaust parameter information on attached form.

C. All calculations used for the annual emission estimates must be submitted with this form to be deemed
complete.

D. All formaldehyde emissions must be modeled as per Utah Administrative Code R307-410-5 using
SCREEN3.

E. If this form is filled out for a new source, forms 1 and 2 must be submitted also.

Page 3 of 4 

INSTRUCTIONS – Form 11 Internal Combustion Engine

NOTE: 1. Submit this form in conjunction with Form 1 and Form 2.

2. Call the Division of Air Quality (DAQ) at [phone] if you have problems or questions in
filling out this form. Ask to speak with a New Source Review engineer. We will be glad to help!

1. Indicate the manufacturer, the model number and the date the engine was constructed or reconstructed.
2. Complete the fuel burning equipment's average and maximum operating schedule in hours per day, days per
week, and weeks per year.
3. Specify the manufacturer's rated output and heat rate at baseload corresponding to International Standard
Organization (ISO) conditions in megawatts (MW) or horsepower (hp). Also indicated what the proposed site
operating range is in megawatts or horsepower.
4. Indicate the origin of the gas used in the engine.
5. Indicate if the gas supply can be interrupted and what the backup fuel is in case this happens.
6. Specify what the annual consumption of fuel is in million standard cubic feet (MMscf).
7. Supply the maximum firing rate in BTU/hr.
8. Supply the average firing rate in BTU/hr.
9. Indicate the grade of oil being used.
10. Supply the annual consumption calculated in gallons of oil.
11. Indicate the heat content of the oil in BTU/lb or BTU/gal.
12. Indicate the sulfur content of the oil in percent by weight.
13. Indicate the ash content of the oil.
14. Supply the average firing rate of oil.
15. Supply the maximum firing rate of oil.
16. Indicate what the firing direction is.
17. Indicate what the engine will be used for.
18. Indicate what type of cycle the engine will have.
19. Indicate the manufacturer’s emissions rate in grams/hp-hr
20. Provide manufacturer's emission information for the engine. Also indicate what method of emission control to
be used.
21. Provide details of the operation of emission controls and exhaust parameter information.

f:\aq\ENGINEER\GENERIC\Forms 2010\Form11 Internal Combustion Engines.doc
Revised 12/20/10
Page 4 of 4 
INTERNAL COMBUSTION ENGINE
FORM 11 (continued)
EMISSION SOURCES
Review of applications and issuance of permits will be expedited by supplying all necessary information requested on this form.
AIR CONTAMINANT DATA EMISSION POINT DISCHARGE PARAMETERS
STACK SOURCES (7) EMISSION POINT
(1)
CHEMICAL COMPOSITION
OF TOTAL STREAM
AIR
CONTAMINANT
EMISSION RATE
UTM COORDINATES OF
EMISSION PT. (6) EXIT DATA
NUMBER NAME
COMPONENT OR AIR
CONTAMINANT NAME
(2)
CONC.
(%V) (3)
LB/HR
(4)
TONS/YR
(5)
ZONE EAST
(METERS)
NORTH
(METERS)
HEIGHT
ABOVE
GROUND
(FT)
HEIGHT
ABOVE
STRUCT.
(FT)
DIA.
(FT)
VELO.
(FPS)
TEMP.
(OF)
GROUND ELEVATION OF FACILITY ABOVE MEAN SEA LEVEL _______________ feet.
UTAH AIR CONSERVATION BOARD STANDARD CONDITIONS ARE 68O F AND 14.7 PSIA.
General Instructions for this form.
1. Identify each emission; point with a unique number for this plant site on plot plan, previous permits and emission inventory questionnaire. Limit emission point number to 8 character spaces. For each
emission point use as many lines as necessary to list air contaminant data. Typical emission point names are: heater, vent, boiler, tank, reactor, separator, baghouse, fugitive, etc. Abbreviations are OK.
2. Typical component names are: air, H2O, nitrogen, oxygen, CO2, CO, NOx, SOx, hexane, particulate matter (PM10 and PM2.5), etc. Abbreviations are OK.
3. Concentration data is required for all gaseous components. Show concentration in volume percent of total gas stream.
4. Pounds per hour. (#/hr) is maximum emission rate expected by applicant.
5. Tons per year (T/Y) is annual maximum emission rate expected by applicant, which takes into account process operating schedule.
6. As a minimum applicant must furnish a facility plot plan drawn to scale showing a plant benchmark, latitude and longitude correct to the nearest second for the benchmark, and all emission points dimensioned
with respect to the benchmark. Please show emission point UTM coordinates if known.
7. Supply additional information as follows if appropriate:
(a) Stack exit configuration other than a round vertical stack. Show length and width for a rectangular stack. Indicate if horizontal discharge with a note.
(b) Stack's height above supporting or adjacent structures if structure is within three "stack heights above ground" of stack.
Cat® C18 DIESEL GENERATOR SETS
LEHE1581-02
Standby & Prime: 60Hz
PACKAGE PERFORMANCE
Image shown might not reflect actual configuration
Engine Model Cat® C18 ACERT™ In-line 6, 4-cycle diesel
Bore x Stroke 145mm x 183mm (5.7in x 7.2in)
Displacement 18.1 L (1106 in³)
Compression Ratio 14.5:1
Aspiration Turbocharged Air-to-Air Aftercooled
Fuel Injection System MEUI
Governor Electronic ADEM™ A4
Model Standby Prime Emission Strategy
C18 600 ekW, 750 kVA 545 ekW, 681 kVA TIER II Non-Road
Performance Standby Prime
Frequency 60 Hz
Genset Power Rating 750 kVA 681 kVA
Genset power rating with fan @ 0.8 power factor 600 ekW 545 ekW
Emissions TIER II Non-Road
Performance Number DM8518-04 DM8522-05
Fuel Consumption
100% load with fan, L/hr (gal/hr)161.6 (42.7)151.1 (39.9)
75% load with fan, L/hr (gal/hr)129.6 (34.2)123.6 (32.6)
50% load with fan, L/hr (gal/hr)91.7 (24.2)89.2 (23.6)
25% load with fan, L/hr (gal/hr)46.8 (12.4)48.7 (12.9)
Cooling System1
Radiator air flow restriction (system), kPa (in. Water)0.12 (0.48)0.12 (0.48)
Radiator air flow, m3/min (cfm)803 (28357)803 (28357)
Engine coolant capacity, L (gal)20.8 (5.5)20.8 (5.5)
Radiator coolant capacity, L (gal)61 (16)61 (16)
Total coolant capacity, L (gal)82 (22)82 (22)
Inlet Air
Combustion air inlet flow rate, m³/min (cfm)47.8 (1687.8)46.7 (1649.0)
Max. Allowable Combustion Air Inlet Temp, °C (°F)49 (120)49 (120)
Exhaust System
Exhaust stack gas temperature, °C (°F)534.6 (994.3)518.2 (964.8)
Exhaust gas flow rate, m³/min (cfm)135.5 (4784.4)129.6 (4576.4)
Exhaust system backpressure (maximum allowable) kPa (in. water)10.0 (40.0)10.0 (40.0)
Heat Rejection
Heat rejection to jacket water, kW (Btu/min)189 (10747)175 (9953)
Heat rejection to exhaust (total) kW (Btu/min)634 (36053)596 (33895)
Heat rejection to aftercooler, kW (Btu/min)153 (8700)142 (8076)
Heat rejection to atmosphere from engine, kW (Btu/min)86 (4902)83 (4726)
3
Cat® C18 DIESEL GENERATOR SETS
Emissions (Nominal)2 Standby Prime
NOx, mg/Nm³ (g/hp-hr)2798.7 (5.8)2462.2 (5.1)
CO, mg/Nm³ (g/hp-hr)225.2 (0.5)195.1 (0.4)
HC, mg/Nm³ (g/hp-hr)3.8 (0.01)5.0 (0.01)
PM, mg/Nm³ (g/hp-hr)13.3 (0.03)13.1 (0.03)
Alternator3
Voltages 480V 600V 480V 600V
Motor starting capability @ 30% Voltage Dip 1633 skVA 2023 skVA 1633 skVA 2023 skVA
Current 902 amps 722 amps 819 amps 656 amps
Frame Size LC7024F LC7024H LC7024F LC7024H
Excitation AR AR AR AR
Temperature Rise 150 ° C 130 ° C 125 ° C 105 ° C
WEIGHTS & DIMENSIONS
APPLICABLE CODES AND STANDARDS:
AS1359, CSA C22.2 No100-04, UL142, UL489, UL869, UL2200, NFPA37, NFPA70,
NFPA99, NFPA110, IBC, IEC60034-1, ISO3046, ISO8528, NEMA MG1-22, NEMA
MG1-33, 2006/95/EC, 2006/42/EC, 2004/108/EC.
Note: Codes may not be available in all model configurations. Please consult your
local Cat Dealer representative for availability.
STANDBY: Output available with varying load for the duration of the interruption
of the normal source power. Average power output is 70% of the standby power
rating. Typical operation is 200 hours per year, with maximum expected usage of
500 hours per year.
PRIME: Output available with varying load for an unlimited time. Average power
output is 70% of the prime power rating. Typical peak demand is 100% of prime
rated ekW with 10% overload capability for emergency use for a maximum of 1
hour in 12. Overload operation cannot exceed 25 hours per year
RATINGS: Ratings are based on SAE J1349 standard conditions. These ratings
also apply at ISO3046 standard conditions.
DEFINITIONS AND CONDITIONS
1 For ambient and altitude capabilities consult your Cat dealer. Air flow restriction
(system) is added to existing restriction from factory.
2 Emissions data measurement procedures are consistent with those described
in EPA CFR 40 Part 89, Subpart D & E and ISO8178-1 for measuring HC, CO, PM,
NOx. Data shown is based on steady state operating conditions of 77° F, 28.42
in HG and number 2 diesel fuel with 35° API and LHV of 18,390 BTU/lb. The
nominal emissions data shown is subject to instrumentation, measurement,
facility and engine to engine variations. Emissions data is based on 100% load
and thus cannot be used to compare to EPA regulations which use values based
on a weighted cycle.
3 UL 2200 Listed packages may have oversized generators with a different
temperature rise and motor starting characteristics. Generator temperature rise
is based on a 40° C ambient per NEMA MG1-32.
LEHE1581-02 (05/20)
www.Cat.com/electricpower
All rights reserved.
Materials and specifications are subject to change without notice.The International System of Units (SI) is used in this publication.
© 2020 Caterpillar. All Rights Reserved. CAT, CATERPILLAR, LET’S DO THE WORK, their respective logos, “Caterpillar Corporate Yellow”, the “Power Edge” and
Cat “Modern Hex” trade dress as well as corporate and product identity used herein, are trademarks of Caterpillar and may not be used without permission
Dim “A” mm (in)Dim “B” mm (in)Dim “C” mm (in)Dry Weight kg (lb)
3477 (137)1628 (64)2102 (83)4431 (9769)
C
A B
4
MAX Performance Data Display
1/5
P D [C18DE6E]
Perf No: DM8518 Change Level: 04
General Heat Rejection Emissions Regulatory Altitude Derate Cross Reference Perf Param Ref
View PDF
SALES MODEL:C18 COMBUSTION:DIRECT INJECTION
BRAND:CAT ENGINE SPEED (RPM):1,800
MACHINE SALES MODEL:HERTZ:60
ENGINE POWER (BHP):900 FAN POWER (HP):24.1
GEN POWER W/O FAN (EKW):621.0 ASPIRATION:TA
GEN POWER WITH FAN (EKW):600.0 AFTERCOOLER TYPE:ATAAC
COMPRESSION RATIO:14.5 AFTERCOOLER CIRCUIT TYPE:JW+OC, ATAAC
RATING LEVEL:STANDBY INLET MANIFOLD AIR TEMP (F):120
PUMP QUANTITY:1 JACKET WATER TEMP (F):192.2
FUEL TYPE:DIESEL TURBO CONFIGURATION:PARALLEL
MANIFOLD TYPE:DRY TURBO QUANTITY:2
GOVERNOR TYPE:ELEC TURBOCHARGER MODEL:S310S089 1.10A/R
CAMSHAFT TYPE:STANDARD CERTIFICATION YEAR:2006
IGNITION TYPE:CI PISTON SPD @ RATED ENG SPD (FT/MIN):2,161.4
INJECTOR TYPE:EUI
6REF EXH STACK DIAMETER (IN):
INDUSTRY SUB INDUSTRY APPLICATION
ELECTRIC POWER STANDARD PACKAGED GENSET
OIL AND GAS LAND PRODUCTION PACKAGED GENSET
General Performance Data Top
GENSET
POWER WITH
FAN
PERCENT
LOAD
ENGINE
POWER
BRAKE MEAN
EFF PRES
(BMEP)
BRAKE SPEC FUEL
CONSUMPTN (BSFC)
ISO BRAKE SPEC FUEL
CONSUMPTN (BSFC)
VOL FUEL
CONSUMPTN
(VFC)
ISO VOL FUEL
CONSUMPTN
(VFC)
EKW %BHP PSI LB/BHP-HR LB/BHP-HR GAL/HR GAL/HR
600.0 100 900 358 0.332 0.327 42.1 41.5
540.0 90 808 321 0.339 0.334 38.6 38.0
480.0 80 718 286 0.350 0.345 35.5 35.0
450.0 75 674 268 0.356 0.351 33.8 33.3
420.0 70 629 250 0.361 0.356 32.0 31.6
360.0 60 541 215 0.369 0.364 28.2 27.8
300.0 50 454 181 0.373 0.368 23.9 23.6
240.0 40 370 147 0.368 0.363 19.2 18.9
180.0 30 286 114 0.358 0.353 14.4 14.2
150.0 25 244 97 0.355 0.350 12.2 12.0
120.0 20 201 80 0.354 0.349 10.0 9.9
60.0 10 114 45 0.412 0.406 6.6 6.5
GENSET POWER
WITH FAN
PERCENT
LOAD
ENGINE
POWER
INLET
MFLD PRES
INLET MFLD
TEMP
EXH MFLD
TEMP
ENGINE
OUTLET TEMP
COMPRESSOR
OUTLET PRES
COMPRESSOR
OUTLET TEMP
EKW %BHP IN-HG DEG F DEG F DEG F IN-HG DEG F
600.0 100 900 69.4 120.2 1,296.3 994.3 75 412.3
540.0 90 808 66.3 118.8 1,245.6 957.8 72 394.7
480.0 80 718 63.5 114.4 1,207.1 930.8 69 382.3
450.0 75 674 61.8 112.9 1,186.7 917.0 67 375.0
420.0 70 629 59.7 111.6 1,165.0 902.7 65 366.6
14
MAX Performance Data Display
GENSET POWER
WITH FAN
PERCENT
LOAD
ENGINE
POWER
INLET
MFLD PRES
INLET MFLD
TEMP
EXH MFLD
TEMP
ENGINE
OUTLET TEMP
COMPRESSOR
OUTLET PRES
COMPRESSOR
OUTLET TEMP
360.0 60 541 53.8 109.2 1,112.0 870.5 59 343.2
300.0 50 454 45.7 106.7 1,046.3 833.0 50 310.5
240.0 40 370 33.5 100.1 946.3 779.4 37 257.4
180.0 30 286 20.4 94.1 835.3 712.8 23 199.4
150.0 25 244 14.8 92.9 777.5 675.5 18 174.4
120.0 20 201 9.7 93.2 718.0 635.0 12 151.3
60.0 10 114 5.3 110.2 594.2 543.7 7 126.8
GENSET
POWER
WITH FAN
PERCENT
LOAD
ENGINE
POWER
WET INLET
AIR VOL
FLOW RATE
ENGINE OUTLET
WET EXH GAS
VOL FLOW RATE
WET INLET
AIR MASS
FLOW RATE
WET EXH
GAS MASS
FLOW RATE
WET EXH VOL FLOW
RATE (32 DEG F AND
29.98 IN HG)
DRY EXH VOL FLOW
RATE (32 DEG F AND
29.98 IN HG)
EKW %BHP CFM CFM LB/HR LB/HR FT3/MIN FT3/MIN
600.0 100 900 1,687.8 4,784.4 7,408.0 7,706.8 1,617.9 1,451.6
540.0 90 808 1,642.0 4,527.0 6,835.4 7,109.2 1,570.3 1,408.9
480.0 80 718 1,610.2 4,346.8 6,444.6 6,696.2 1,537.1 1,379.1
450.0 75 674 1,585.8 4,235.0 6,219.7 6,459.3 1,512.6 1,357.1
420.0 70 629 1,553.7 4,103.3 5,966.3 6,193.4 1,480.9 1,328.7
360.0 60 541 1,458.4 3,757.4 5,337.4 5,537.1 1,388.9 1,246.1
300.0 50 454 1,320.6 3,305.0 4,563.8 4,733.3 1,257.1 1,127.9
240.0 40 370 1,111.5 2,682.3 3,553.5 3,689.7 1,064.4 955.0
180.0 30 286 884.9 2,022.7 2,525.0 2,627.5 848.2 761.0
150.0 25 244 785.6 1,730.6 2,088.7 2,175.3 749.5 672.5
120.0 20 201 693.2 1,458.1 1,697.2 1,768.4 654.9 587.6
60.0 10 114 597.1 1,145.6 1,226.4 1,273.3 561.4 503.7
Heat Rejection Data Top
GENSET
POWER
WITH
FAN
PERCENT
LOAD
ENGINE
POWER
REJECTION
TO JACKET
WATER
REJECTION
TO
ATMOSPHERE
REJECTION
TO EXH
EXHAUST
RECOVERY
TO 350F
FROM
OIL
COOLER
FROM
AFTERCOOLER
WORK
ENERGY
LOW
HEAT
VALUE
ENERGY
HIGH
HEAT
VALUE
ENERGY
EKW %BHP BTU/MIN BTU/MIN BTU/MIN BTU/MIN BTU/MIN BTU/MIN BTU/MIN BTU/MIN BTU/MIN
600.0 100 900 10,747 4,902 36,053 25,532 4,927 8,700 38,156 92,511 98,547
540.0 90 808 9,782 4,629 33,384 23,204 4,501 8,019 34,283 84,515 90,030
480.0 80 718 8,986 4,214 31,336 21,497 4,132 7,621 30,466 77,572 82,634
450.0 75 674 8,588 3,960 30,201 20,572 3,935 7,343 28,577 73,883 78,704
420.0 70 629 8,190 3,714 28,948 19,564 3,728 6,995 26,691 69,994 74,562
360.0 60 541 7,280 3,361 25,878 17,120 3,276 6,029 22,961 61,507 65,520
300.0 50 454 6,312 3,082 22,121 14,274 2,778 4,777 19,272 52,156 55,559
240.0 40 370 5,495 2,832 17,303 10,690 2,231 3,160 15,694 41,880 44,613
180.0 30 286 4,715 2,598 12,425 7,201 1,677 1,641 12,128 31,482 33,537
150.0 25 244 4,301 2,088 10,360 5,720 1,416 1,113 10,337 26,580 28,314
120.0 20 201 3,873 1,654 8,496 4,395 1,163 687 8,525 21,841 23,266
60.0 10 114 2,853 1,533 5,930 2,515 768 173 4,826 14,415 15,355
Emissions Data Top Units Filter All Units
DIESEL
RATED SPEED NOMINAL DATA: 1800 RPM
TOTAL NOX (AS NO2)G/HR 5,128 2,257 1,267 1,669 1,075
TOTAL CO G/HR 414 308 113 121 192
TOTAL HC G/HR 8 15 35 19 19
TOTAL CO2 KG/HR 422 338 239 122 67
PART MATTER G/HR 29.9 42.0 24.0 10.2 8.6
GENSET POWER WITH FAN EKW 600.0 450.0 300.0 150.0 60.0
ENGINE POWER BHP 900 674 454 244 114
PERCENT LOAD %100 75 50 25 10
15
MAX Performance Data Display
TOTAL NOX (AS NO2)(CORR 5% O2)MG/NM3 2,798.7 1,521.4 1,263.2 3,289.5 3,725.1
TOTAL CO (CORR 5% O2)MG/NM3 225.2 208.5 108.6 237.7 691.0
TOTAL HC (CORR 5% O2)MG/NM3 3.8 9.3 28.7 31.3 60.5
PART MATTER (CORR 5% O2)MG/NM3 13.3 24.3 20.2 17.2 28.1
TOTAL NOX (AS NO2)(CORR 5% O2)PPM 1,363 741 615 1,602 1,814
TOTAL CO (CORR 5% O2)PPM 180 167 87 190 553
TOTAL HC (CORR 5% O2)PPM 7 17 54 59 113
TOTAL NOX (AS NO2)G/HP-HR 5.75 3.37 2.80 6.86 9.46
TOTAL CO G/HP-HR 0.46 0.46 0.25 0.50 1.68
TOTAL HC G/HP-HR 0.01 0.02 0.08 0.08 0.17
PART MATTER G/HP-HR 0.03 0.06 0.05 0.04 0.08
TOTAL NOX (AS NO2)LB/HR 11.30 4.98 2.79 3.68 2.37
TOTAL CO LB/HR 0.91 0.68 0.25 0.27 0.42
TOTAL HC LB/HR 0.02 0.03 0.08 0.04 0.04
TOTAL CO2 LB/HR 930 746 528 269 149
PART MATTER LB/HR 0.07 0.09 0.05 0.02 0.02
OXYGEN IN EXH %9.0 10.9 12.5 13.6 15.9
DRY SMOKE OPACITY %0.8 1.1 0.9 0.6 0.5
BOSCH SMOKE NUMBER 0.46 0.74 0.54 0.30 0.22
GENSET POWER WITH FAN EKW 600.0 450.0 300.0 150.0 60.0
ENGINE POWER BHP 900 674 454 244 114
PERCENT LOAD %100 75 50 25 10
RATED SPEED POTENTIAL SITE VARIATION: 1800 RPM
TOTAL NOX (AS NO2)G/HR 5,538 2,437 1,369 1,803 1,161
TOTAL CO G/HR 774 577 211 226 358
TOTAL HC G/HR 15 29 65 37 37
PART MATTER G/HR 58.3 81.9 46.9 19.9 16.8
TOTAL NOX (AS NO2)(CORR 5% O2)MG/NM3 3,022.6 1,643.1 1,364.2 3,552.7 4,023.2
TOTAL CO (CORR 5% O2)MG/NM3 421.1 389.9 203.1 444.4 1,292.1
TOTAL HC (CORR 5% O2)MG/NM3 7.1 17.6 54.2 59.2 114.4
PART MATTER (CORR 5% O2)MG/NM3 26.0 47.3 39.3 33.4 54.7
TOTAL NOX (AS NO2)(CORR 5% O2)PPM 1,472 800 664 1,730 1,960
TOTAL CO (CORR 5% O2)PPM 337 312 162 356 1,034
TOTAL HC (CORR 5% O2)PPM 13 33 101 111 214
TOTAL NOX (AS NO2)G/HP-HR 6.21 3.64 3.02 7.41 10.21
TOTAL CO G/HP-HR 0.87 0.86 0.47 0.93 3.15
TOTAL HC G/HP-HR 0.02 0.04 0.14 0.15 0.32
PART MATTER G/HP-HR 0.07 0.12 0.10 0.08 0.15
TOTAL NOX (AS NO2)LB/HR 12.21 5.37 3.02 3.97 2.56
TOTAL CO LB/HR 1.71 1.27 0.46 0.50 0.79
TOTAL HC LB/HR 0.03 0.06 0.14 0.08 0.08
PART MATTER LB/HR 0.13 0.18 0.10 0.04 0.04
GENSET POWER WITH FAN EKW 600.0 450.0 300.0 150.0 60.0
ENGINE POWER BHP 900 674 454 244 114
PERCENT LOAD %100 75 50 25 10
Regulatory Information Top
EPA TIER 2 2006 - 2010
GASEOUS EMISSIONS DATA MEASUREMENTS PROVIDED TO THE EPA ARE CONSISTENT WITH THOSE DESCRIBED IN EPA 40 CFR PART 89 SUBPART
D AND ISO 8178 FOR MEASURING HC, CO, PM, AND NOX. THE "MAX LIMITS" SHOWN BELOW ARE WEIGHTED CYCLE AVERAGES AND ARE IN
COMPLIANCE WITH THE NON-ROAD REGULATIONS.
Locality Agency Regulation Tier/Stage Max Limits - G/BKW - HR
U.S. (INCL CALIF)EPA NON-ROAD TIER 2 CO: 3.5 NOx + HC: 6.4 PM: 0.20
EPA EMERGENCY STATIONARY 2011 - ----
GASEOUS EMISSIONS DATA MEASUREMENTS PROVIDED TO THE EPA ARE CONSISTENT WITH THOSE DESCRIBED IN EPA 40 CFR PART 60 SUBPART
IIII AND ISO 8178 FOR MEASURING HC, CO, PM, AND NOX. THE "MAX LIMITS" SHOWN BELOW ARE WEIGHTED CYCLE AVERAGES AND ARE IN
COMPLIANCE WITH THE EMERGENCY STATIONARY REGULATIONS.
Locality Agency Regulation Tier/Stage Max Limits - G/BKW - HR
U.S. (INCL CALIF)EPA STATIONARY EMERGENCY STATIONARY CO: 3.5 NOx + HC: 6.4 PM: 0.20
Altitude Derate Data Top
STANDARD
16
MAX Performance Data Display
ALTITUDE CORRECTED POWER CAPABILITY (BHP)
AMBIENT OPERATING TEMP (F)30 40 50 60 70 80 90 100 110 120 130 140 NORMAL
ALTITUDE (FT)
0 900 900 900 900 900 900 900 900 900 900 900 900 900
1,000 900 900 900 900 900 900 900 900 900 898 882 868 900
2,000 900 900 900 900 900 900 900 895 879 864 850 835 900
3,000 900 900 900 900 900 893 877 861 846 832 818 804 900
4,000 900 900 900 893 876 859 844 829 814 800 787 773 885
5,000 900 893 875 858 842 827 812 797 783 770 757 744 857
6,000 876 858 842 825 810 795 780 766 753 740 727 715 830
7,000 842 825 809 793 778 764 750 736 724 711 699 687 803
8,000 809 793 777 762 748 734 720 708 695 683 672 660 777
9,000 777 761 746 732 718 705 692 680 668 656 645 634 751
10,000 746 731 716 703 689 677 664 652 641 630 619 609 726
11,000 716 701 687 674 661 649 637 626 615 604 594 584 702
12,000 686 673 659 647 635 623 611 601 590 580 570 560 678
13,000 658 645 632 620 608 597 586 576 566 556 546 537 655
14,000 631 618 606 594 583 572 562 552 542 533 524 515 632
15,000 604 592 581 569 559 548 538 529 519 510 502 493 610
Cross Reference Top
Test Spec Setting Engine Arrangement
Engineering
Model
Engineering
Model Version
Start Effective
Serial Number
End Effective
Serial Number
0K7257 PP5703 2726915 GS338 -EST00001
4150902 NAP 4658874 EE362 -JGN00001
4150902 NAP 4658880 EE362 -JGN00001
4150902 NAP 4707158 EE362 -JGN00001
Performance Parameter Reference Top
Parameters Reference: DM9600 - 14
PERFORMANCE DEFINITIONS
PERFORMANCE DEFINITIONS DM9600
APPLICATION: Engine performance tolerance values below are representative of a typical production engine tested in a
calibrated dynamometer test cell at SAE J1995 standard reference conditions. Caterpillar maintains ISO9001:2000 certified
quality management systems for engine test Facilities to assure accurate calibration of test equipment. Engine test data is
corrected in accordance with SAE J1995. Additional reference material SAE J1228, J1349, ISO 8665, 3046-1:2002E, 3046-
3:1989, 1585, 2534, 2288, and 9249 may apply in part or are similar to SAE J1995. Special engine rating request (SERR)
test data shall be noted.
PERFORMANCE PARAMETER TOLERANCE FACTORS: Power +/- 3% Torque +/- 3% Exhaust stack temperature +/- 8%
Inlet airflow +/- 5% Intake manifold pressure-gage +/- 10% Exhaust flow +/- 6% Specific fuel consumption +/- 3% Fuel
rate +/- 5% Specific DEF consumption +/- 3% DEF rate +/- 5% Heat rejection +/- 5% Heat rejection exhaust only +/- 10%
Heat rejection CEM only +/- 10%
Heat Rejection values based on using treated water.
Torque is included for truck and industrial applications, do not use for Gen Set or steady state applications.
On C7 - C18 engines, at speeds of 1100 RPM and under these values are provided for reference only, and may not meet the
tolerance listed.
On 3500 and C175 engines, at speeds below Peak Torque these values are provided for reference only, and may not meet the
tolerance listed.
These values do not apply to C280/3600. For these models, see the tolerances listed below.
C280/3600 HEAT REJECTION TOLERANCE FACTORS: Heat rejection +/- 10% Heat rejection to Atmosphere +/- 50%
Heat rejection to Lube Oil +/- 20% Heat rejection to Aftercooler +/- 5%
TEST CELL TRANSDUCER TOLERANCE FACTORS: Torque +/- 0.5% Speed +/- 0.2% Fuel flow +/- 1.0% Temperature +/-
2.0 C degrees Intake manifold pressure +/- 0.1 kPa
OBSERVED ENGINE PERFORMANCE IS CORRECTED TO SAE J1995 REFERENCE AIR AND FUEL CONDITIONS.
REFERENCE ATMOSPHERIC INLET AIR FOR 3500 ENGINES AND SMALLER SAE J1228 AUG2002 for marine engines, and
J1995 JAN2014 for other engines, reference atmospheric pressure is 100 KPA (29.61 in hg), and standard temperature is
17
MAX Performance Data Display
25deg C (77 deg F) at 30% relative humidity at the stated aftercooler water temp, or inlet manifold temp.
FOR 3600 ENGINES Engine rating obtained and presented in accordance with ISO 3046/1 and SAE J1995 JANJAN2014
reference atmospheric pressure is 100 KPA (29.61 in hg), and standard temperature is 25deg C (77 deg F) at 30% relative
humidity and 150M altitude at the stated aftercooler water temperature.
MEASUREMENT LOCATION FOR INLET AIR TEMPERATURE Location for air temperature measurement air cleaner inlet at
stabilized operating conditions.
REFERENCE EXHAUST STACK DIAMETER The Reference Exhaust Stack Diameter published with this dataset is only used
for the calculation of Smoke Opacity values displayed in this dataset. This value does not necessarily represent the actual
stack diameter of the engine due to the variety of exhaust stack adapter options available. Consult the price list, engine order
or general dimension drawings for the actual stack diameter size ordered or options available.
REFERENCE FUEL DIESEL Reference fuel is #2 distillate diesel with a 35API gravity; A lower heating value is 42,780 KJ/KG
(18,390 BTU/LB) when used at 15 deg C (59 deg F), where the density is 850 G/Liter (7.0936 Lbs/Gal).
GAS Reference natural gas fuel has a lower heating value of 33.74 KJ/L (905 BTU/CU Ft). Low BTU ratings are based on 18.64
KJ/L (500 BTU/CU FT) lower heating value gas. Propane ratings are based on 87.56 KJ/L (2350 BTU/CU Ft) lower heating
value gas.
ENGINE POWER (NET) IS THE CORRECTED FLYWHEEL POWER (GROSS) LESS EXTERNAL AUXILIARY LOAD Engine
corrected gross output includes the power required to drive standard equipment; lube oil, scavenge lube oil, fuel transfer,
common rail fuel, separate circuit aftercooler and jacket water pumps. Engine net power available for the external (flywheel)
load is calculated by subtracting the sum of auxiliary load from the corrected gross flywheel out put power. Typical auxiliary
loads are radiator cooling fans, hydraulic pumps, air compressors and battery charging alternators. For Tier 4 ratings
additional Parasitic losses would also include Intake, and Exhaust Restrictions.
ALTITUDE CAPABILITY Altitude capability is the maximum altitude above sea level at standard temperature and standard
pressure at which the engine could develop full rated output power on the current performance data set.
Standard temperature values versus altitude could be seen on TM2001.
When viewing the altitude capability chart the ambient temperature is the inlet air temp at the compressor inlet.
Engines with ADEM MEUI and HEUI fuel systems operating at conditions above the defined altitude capability derate for
atmospheric pressure and temperature conditions outside the values defined, see TM2001.
Mechanical governor controlled unit injector engines require a setting change for operation at conditions above the altitude
defined on the engine performance sheet. See your Caterpillar technical representative for non standard ratings.
REGULATIONS AND PRODUCT COMPLIANCE TMI Emissions information is presented at 'nominal' and 'Potential Site
Variation' values for standard ratings. No tolerances are applied to the emissions data. These values are subject to change at
any time. The controlling federal and local emission requirements need to be verified by your Caterpillar technical
representative.
Customer's may have special emission site requirements that need to be verified by the Caterpillar Product Group engineer.
EMISSION CYCLE LIMITS: Cycle emissions Max Limits apply to cycle-weighted averages only. Emissions at individual load
points may exceed the cycle-weighted limit.
WET & DRY EXHAUST/EMISSIONS DESCRIPTION: Wet - Total exhaust flow or concentration of total exhaust flow Dry -
Total exhaust flow minus water vapor or concentration of exhaust flow with water vapor excluded
EMISSIONS DEFINITIONS: Emissions : DM1176
EMISSION CYCLE DEFINITIONS
1. For constant-speed marine engines for ship main propulsion, including,diesel-electric drive, test cycle E2 shall be applied,
for controllable-pitch propeller sets test cycle E2 shall be applied.
2. For propeller-law-operated main and propeller-law-operated auxiliary engines the test cycle E3 shall be applied.
3. For constant-speed auxiliary engines test cycle D2 shall be applied.
4. For variable-speed, variable-load auxiliary engines, not included above, test cycle C1 shall be applied.
HEAT REJECTION DEFINITIONS: Diesel Circuit Type and HHV Balance : DM9500
HIGH DISPLACEMENT (HD) DEFINITIONS: 3500: EM1500
RATING DEFINITIONS: Agriculture : TM6008
Fire Pump : TM6009
Generator Set : TM6035
Generator (Gas) : TM6041
Industrial Diesel : TM6010
Industrial (Gas) : TM6040
Irrigation : TM5749
Locomotive : TM6037
Marine Auxiliary : TM6036
Marine Prop (Except 3600) : TM5747
Marine Prop (3600 only) : TM5748
MSHA : TM6042
Oil Field (Petroleum) : TM6011
Off-Highway Truck : TM6039
On-Highway Truck : TM6038
SOUND DEFINITIONS: Sound Power : DM8702
Sound Pressure : TM7080
Date Released : 10/27/21
18
Hours of Op 100 hr/yr
Old Engine (repOld Engine (rep Removed EnginNew Engines
Size (hp)368 66 51 900 (x2)
Nox 0.57 0.10 0.08 1.22
PM10 0.04 0.01 0.01 0.01
PM2.5 0.04 0.01 0.01 0.01
CO 0.04 0.01 0.01 0.00
VOC 0.12 0.02 0.02 0.17
CO 0.05 0.01 0.01 0.00
Existing PTE New PTE change
Nox 346.85 347.32 0.47
PM10 266.58 266.54 -0.04
PM2.5 245.54 245.50 -0.04
SO2 253.32 253.27 -0.05
CO 2993.21 2993.22 0.01
VOC 150.27 150.21 -0.06
CO2 151073 151073 0
Emission lb/hp-hr
Old Engine (repOld Engine (rep Removed EnginNew Engines
Size 368 48 900 (x2) lb/hr*
Nox 0.031 0.031 0.031 12.21
PM10 0.0022 0.0022 0.0022 0.13
PM2.5 0.0022 0.0022 0.0022 0.13
SO2 0.00205 0.00205 0.00205
CO 0.00668 0.00668 0.00668 1.71
VOC 0.00247 0.00247 0.00247 0.03
CO2 1.15 1.15 1.15 930
Hours of Op 100 hr/yr
Old Engine (repOld Engine (repRemoved EnginNew Engines
Size (hp)368 66 51 900 (x2)
Nox 0.57 0.10 0.08 1.22
PM10 0.04 0.01 0.01 0.01
PM2.5 0.04 0.01 0.01 0.01
SO2 0.04 0.01 0.01 0.18
VOC 0.12 0.02 0.02 0.17
CO 0.05 0.01 0.01 0.00
Existing PTE New PTE change
Nox 346.85 347.32 0.47
PM10 266.58 266.54 -0.04
PM2.5 245.54 245.50 -0.04
SO2 253.32 253.45 0.13
VOC 2993.21 2993.22 0.01
CO 150.27 150.21 -0.06
CO2 151073 151073 0
Emission lb/hp-hr
Old Engine (repOld Engine (repRemoved EnginNew Engines
Size 368 48 900 (x2) lb/hr*
Nox 0.031 0.031 0.031 12.21
PM10 0.0022 0.0022 0.0022 0.13
PM2.5 0.0022 0.0022 0.0022 0.13
SO2 0.00205 0.00205 0.00205 0.00205 SO2 is in lb/hp-hr
CO 0.00668 0.00668 0.00668 1.71
VOC 0.00247 0.00247 0.00247 0.03
CO2 1.15 1.15 1.15 930
7/5/23, 3:45 PM State of Utah Mail - Emergency Generator Permit Emission Calcs
https://mail.google.com/mail/u/0/?ik=b363bbe9c3&view=pt&search=all&permmsgid=msg-f:1769420718825863560&simpl=msg-f:1769420718825863560 1/2
Sarah Foran <[e-mail]>
Emergency Generator Permit Emission Calcs
Jones, Doug (NSUT) <[e-mail]>Thu, Jun 22, 2023 at 10:24 AM
To: Sarah Foran <[e-mail]>
Cc: "Srymanske, Roy H. (NSUT)" <[e-mail]>
Sarah,

Below is the emergency generator calcs for the generator that wasn’t installed. There were two permitted that were identical. This one is referenced in the original
application as Main Office. The other is referenced as Truck Scale. There was some later correspondence that moved the location identification for the permitted
generators to various locations over time as other changes were made at the site. So, there is a different permitted generator at the main office now ( we shouldn’t
have a reference that there isn’t one). And the second one of these is at the truck scale now. But where we permitted two, we only purchased one.

Reduced Potential to Offset October 2013
MAIN OFFICE EMERGENCY GENERATOR (51 HP)
EMISSION FACTORS
POLLUTANT EMISSION
FACTOR (lb/HP-hr)
NOX 0.031
PM/PM10/PM2.5 0.0022
SO2 0.00205
7/5/23, 3:45 PM State of Utah Mail - Emergency Generator Permit Emission Calcs
https://mail.google.com/mail/u/0/?ik=b363bbe9c3&view=pt&search=all&permmsgid=msg-f:1769420718825863560&simpl=msg-f:1769420718825863560 2/2
CO 0.00668
VOC 0.00247
MAXIMUM EMISSIONS HP:51
hours/year:100
POLLUTANT EMISSION RATE
(tons/year)
NOX 0.08
PM/PM10/PM2.5 0.006
SO2 0.005
CO 0.017
VOC 0.006