DAQ-2024-011745

DAQE-AN120660006-24

{{$d1 }}

Randa Hawley
Hawley Rock Products, Inc.
760 South 1400 West
Annabella, UT 84711
[e-mail]

Dear Ms. Hawley:

Re: Approval Order: Modification to Approval Order DAQE-AN120660005-22 to Add a Generator
Engine
Project Number: N120660006

The attached Approval Order (AO) is issued pursuant to the Notice of Intent (NOI) received on
November 16, 2022. Hawley Rock Products, Inc. must comply with the requirements of this AO, all
applicable state requirements (R307), and Federal Standards.

The project engineer for this action is Mr. Tim DeJulis, 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:TD:jg

cc: Central Utah Health Department

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

November 21, 2024

STATE OF UTAH
Department of Environmental Quality
Division of Air Quality

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APPROVAL ORDER
DAQE-AN120660006-24
Modification to Approval Order DAQE-AN120660005-22 to
Add a Generator Engine

Prepared By
Mr. Tim DeJulis, Engineer
[phone]
[e-mail]

Issued to
Hawley Rock Products, Inc. - Crushing and Screening Operation

Issued On
{{$d2 }}

Issued By

{{$s }}

Bryce C. Bird
Director
Division of Air Quality

November 21, 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 ................................................................................................. 3
Project Description.................................................................................................................. 4
SUMMARY OF EMISSIONS .................................................................................................... 4
SECTION I: GENERAL PROVISIONS .................................................................................... 4
SECTION II: PERMITTED EQUIPMENT .............................................................................. 5
SECTION II: SPECIAL PROVISIONS ..................................................................................... 8
PERMIT HISTORY ................................................................................................................... 14
ACRONYMS ............................................................................................................................... 15

DAQE-AN120660006-24
Page 3

GENERAL INFORMATION

CONTACT/LOCATION INFORMATION

Owner Name Source Name
Hawley Rock Products, Inc. Hawley Rock Products, Inc. - Crushing and Screening Operation

Mailing Address Physical Address
760 South 1400 West 780 West 1400 South
Annabella, UT 84711 Elsinore, UT 84724

Source Contact UTM Coordinates
Name: Randa Hawley 398,850 m Easting
Phone: [phone],280,130 m Northing
Email: [e-mail] Datum NAD83
UTM Zone 12
SIC code 1442 (Construction Sand & Gravel)

SOURCE INFORMATION
General Description
Hawley Rock Products, Inc. (Hawley) operates an aggregate processing plant in Elsinore in Sevier
County. Operations include aggregate mining, crushing, screening, and hauling. Diesel and natural
gas-fueled generator engines provide power to the onsite equipment. Annual aggregate production is
limited to 875,000 tons.

NSR Classification
Minor Modification at Minor Source

Source Classification
Located in Attainment Area
Sevier County
Airs Source Size: B

Applicable Federal Standards
NSPS (Part 60), A: General Provisions
NSPS (Part 60), OOO: Standards of Performance for Nonmetallic Mineral Processing Plants
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
DAQE-AN120660006-24
Page 4

Stationary Reciprocating Internal Combustion Engines
Title V (Part 70) Area Source

Project Description
Hawley has requested a modification to AO DAQE-AN120660005-22, dated May 12, 2022, to add a 226
hp natural gas-fueled generator engine to the site. Hawley will have the use of electric power to generate
power for the CBP, at some point in the future.

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 333 4883.00
Carbon Monoxide 1.87 11.43
Nitrogen Oxides 0.93 29.34
Particulate Matter - PM10 0.03 8.59
Particulate Matter - PM2.5 0.03 3.20
Sulfur Dioxide 0 1.85
Volatile Organic Compounds 0.65 3.10

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Total HAPs (CAS #THAPS) 420 540
Change (TPY) Total (TPY)
Total HAPs 0.21 0.27

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 two-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 two (2) years. [R307-401-8]
DAQE-AN120660006-24
Page 5

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]

SECTION II: PERMITTED EQUIPMENT
II.A THE APPROVED EQUIPMENT II.A.1 Hawley Crushing and Screening Plant (Manufacturers' names are listed for identification purposes only)
II.A.2 Pioneer Roll Crusher - 54" x 24" Rating: 154 TPH Manufacture Date: 1951 Associated Engine Rated Capacity: 245 hp Manufacture Date: prior to 1973 MACT 40 CFR 63 Subpart ZZZZ Equipment II.A.3 Symons Cone Crusher Rating: 145 TPH Manufacture Date: 1951
II.A.4 Cedarapids Roll Crusher - 40" x 24" Rating: 154 TPH Manufacture Date: 1954 II.A.5 Pioneer Jaw Crusher - 10" x 36" Rating: 440 THP Manufacture Date: 1959
II.A.6 Nordberg Cone Crusher Rating: 220 THP Manufacture Date: 1967 II.A.7 Pioneer Roll Crusher - 30" x 40" Rating: 154 TPH Manufacture Date: 1968
DAQE-AN120660006-24
Page 6

II.A.8 Eagle Jaw Crusher - 20" x 36" Rating: 600 TPH Manufacture Date: 1968 II.A.9 Telsmith Cone Crusher - 6" x 16"
Rating: 205 THP Manufacture Date: 1970
II.A.10 Cedarapids Jaw Crusher - 16" x 48" Rating: 500 TPH Manufacture Date: 1970
II.A.11 Cedarapids Jaw Crusher - 18" x 36" Rating: 140 TPH Manufacture Date: 1971

II.A.12 El Jay Cone Crusher - 54" Rating: 330 TPH Manufacture Date: 1979 II.A.13 Acrowood Impact Crusher
Rating: 145 TPH
Manufacture Date: 1987 NSPS Subpart OOO Equipment

II.A.14 Nordberg Cone Crusher Rating: 400 THP Manufacture Date: 1993 NSPS Subpart OOO Equipment II.A.15 Cedarapids Jaw Crusher - 30" x 42"
Rating: 600 THP
Manufacture Date: Unknown NSPS Subpart OOO Equipment

II.A.16 Cedarapids Screen Plant - 4" x 14" and 4" x 12" Twin screens Manufacture Date: 1965
II.A.17 El Jay Screen - 6" x 20" Manufacture Date: 1979

II.A.18 El Jay Screen - 6" x 16" Manufacture Date: 1983 NSPS Subpart OOO Equipment
II.A.19 El Jay Screen - 6" x 16"
Manufacture Date: 1983
NSPS Subpart OOO Equipment

II.A.20 El Jay Screen Plant - 6" x 16" Manufacture Date: 1983 NSPS Subpart OOO Equipment
DAQE-AN120660006-24
Page 7

II.A.21 El Jay Screen Plant - 6" x 16" Twin Screens Manufacture Date: 1985 NSPS Subpart OOO Equipment
II.A.22 El Jay Screen Plant - 6" x 20" Manufacture Date: 1988 NSPS Subpart OOO Equipment

II.A.23 JCI Screen - 6" x 20" Manufacture Date: 1997 NSPS Subpart OOO Equipment II.A.24 Simplicity Screen - 6" x 20" Manufacture Date: 1997
NSPS Subpart OOO Equipment
II.A.25 Screens (chip wash) Listed for informational purposes only II.A.26 Diesel Generator Engine
Rating: 400 kW (536 hp)
Manufacture Date: 1976 MACT Subpart ZZZZ

II.A.27 Diesel Generator Engine Rating: 200 kW (268 hp) Manufacture Date: 1977 MACT Subpart ZZZZ II.A.28 Diesel Generator Engine
Rating: 455 kW (610 hp)
Manufacture Date: 2015 NSPS Subpart IIII
MACT Subpart ZZZZ

II.A.29 Natural Gas Generator Engine (new) Rating: 150 kW (226 hp) Manufacture Date: 2022 NSPS Subpart JJJJ MACT Subpart ZZZZ
II.A.30 Conveyors and Stacks Various conveyors and stacks
Manufacture Date: pre-2008
NSPS Subpart OOO Equipment

II.A.31 One (1) Truck-Mix Concrete Batch Plant The plant is rated at 80 cubic yard/hr of concrete Major equipment includes: Sand and aggregate hoppers and storage bins Conveyors Cement and fly ash silos and associated baghouses Concrete mixing trucks

DAQE-AN120660006-24
Page 8

SECTION II: SPECIAL PROVISIONS
II.B REQUIREMENTS AND LIMITATIONS

II.B.1 Site-Wide Requirements
II.B.1.a The owner/operator shall not produce more than 875,000 tons of processed aggregate per rolling
12-month period. [R307-401-8]

II.B.1.a.1 The owner/operator shall: A. Determine production with belt scale records, scale house records, or bucket scale records. B. Record production on a daily basis. C. Use the production data to calculate a new rolling 12-month total by the 20th day of each month using the data from the previous 12 months. D. Keep the production records for all periods the plant is in operation. [R307-401-8]
II.B.1.b The owner/operator shall not produce more than 350 tons of aggregate per hour. [R307-401-8]

II.B.1.b.1 The owner/operator shall: A. Comply with the limit using data generated from a load cell monitor and associated software. B. Keep the records of hourly production for all periods when the plant is in operation. [R307-401-8]
II.B.1.c The owner/operator shall not operate the generator engines on site for more than the following
limits:

A. 200 hours per rolling 12-month period for the 245-hp generator engine (II.A.2).

B. 2,500 hours per rolling 12-month period for the 400-kW generator engine (II.A.26).

C. 600 hours per rolling 12-month period for the 200-kW generator engine (II.A.27).

D. 2,500 hours per rolling 12-month period for the 455-kW generator engine (II.A.28).

E. 3,744 hours per rolling 12-month period for the 150-kW generator engine (II.A.29).

[R307-401-8]

DAQE-AN120660006-24
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II.B.1.c.1 The owner/operator shall: A. Determine the hours of operation with a supervisor monitoring and maintenance of an operations log. B. Record the hours of operation daily. C. Use the hours of operation to calculate a new rolling 12-month total by the 20th day of each month using data from the previous 12 months. D. Keep the hours of operation records for all periods when the plant is in operation. [R307-401-8]
II.B.1.d The owner/operators shall limit operations to the following number of units at one time:
A. Two (2) screens;
B. One (1) fines screen; and

C. Four (4) crushers.
[R307-401-8]

II.B.1.d.1 Records of plant configuration shall be kept on a weekly basis for all periods when the plant is in operation. [R307-401-8]
II.B.1.e The owner operator shall not allow visible emissions from the following emission points to exceed the following values:

A. All crushers - 15% opacity.
B. All screens - 10% opacity.
C. All conveyor transfer points - 10% opacity.

D. All diesel engines - 20% opacity.
E. All natural gas engines - 10% opacity.
F. All conveyor drop points - 20% opacity.

G. The truck-mix concrete batch plant and associated equipment - 10% opacity.
H. All other fugitive dust emissions - 20% opacity.

[40 CFR 60 Subpart OOO, R307-205, R307-401-8]

II.B.1.e.1 Opacity observations of emissions from stationary sources shall be conducted according to 40 CFR 60, Appendix A, Method 9. [R307-401-8]
II.B.2 Roads and Fugitive Dust
II.B.2.a The owner/operator shall not allow visible fugitive dust emissions from haul-road traffic, mobile equipment, and all other sources in operational areas to exceed 20% opacity on site. [R307-401-8]
DAQE-AN120660006-24
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II.B.2.a.1 Visible emission determinations for fugitive dust from haul roads and operational areas shall use procedures similar to Method 9. The normal requirement for observations to be made at 15-second intervals over a six-minute period, however, shall not apply. 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.b The owner/operator shall use water application and chemical suppressant on all haul roads and operational areas used by mobile equipment to maintain opacity limits listed in this AO. The
owner/operator may stop applying water to the haul roads and operational areas when the temperature is below freezing. [R307-401-8]
II.B.2.c The owner/operator shall apply water to all storage piles on site to control fugitive emissions. Sprays shall operate as required to maintain the opacity limits listed in this AO when the temperature is above freezing. Records of water treatment shall be kept for all periods when the plant is in operation. [R307-401-8] II.B.2.c.1 Records of water and chemical suppressant application on all haul roads and operational areas
used by mobile equipment shall be kept for all periods when the plant is in operation. The
records shall include the following items:
A. Date and time treatments were made.
B. Number of treatments made and quantity of water applied.

C. Rainfall amount received, if any.
D. Records of temperature, if the temperature is below freezing.
[R307-401-8]

II.B.2.d The owner/operator shall not exceed three (3) acres of total area of storage piles on site. [R307-401-8]
II.B.3 Aggregate Processing Equipment
II.B.3.a The owner/operator shall install water sprays on all crushers, all screens, all conveyor transfer points, and all conveyor drop points on site to control emissions. Sprays shall operate as required to maintain the opacity limits listed in this AO when the temperature is above freezing. [40 CFR 60 Subpart OOO, R307-401-8] II.B.3.b The owner/operator shall perform monthly periodic inspections to check that water is flowing to
discharge spray nozzles associated with each crusher, screen, and conveyor. If the
owner/operator finds that water is not flowing properly during an inspection of the water spray nozzles, the owner/operator shall initiate corrective action within 24 hours and complete
corrective action as expediently as practical. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.3.b.1 Records of the water sprays inspections shall be kept and maintained in a logbook for all periods when the plant is in operation. The records shall include the following items: A. Date the inspections were made. B. Any corrective actions taken. C. Control mechanism used if sprays are not operating. [40 CFR 60 Subpart OOO, R307-401-8]
DAQE-AN120660006-24
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II.B.3.c The owner/operator shall conduct an initial performance test for all crushers, screens, and conveyor transfer points listed as new in this AO and subject to 40 CFR 60 Subpart OOO within 60 days after achieving the maximum production rate but not later than 180 days after initial startup. Performance tests shall meet the limitations specified in Table 3 to Subpart OOO. Records of initial performance tests shall be kept and maintained with the equipment for the life of the equipment. [40 CFR 60 Subpart OOO] II.B.3.c.1 Initial performance tests for fugitive emissions limits shall be conducted according to 40 CFR
60.675(c). The owner/operator may use methods and procedures specified in 40 CFR 60.675(e) as alternatives to the reference methods and procedures specified in 40 CFR 60.675(c). [ 40 CFR 60 Subpart OOO]

II.B.3.d The owner/operator shall submit written reports to the Director of the results of all performance tests conducted to demonstrate compliance with the standards set forth in 40 CFR 60.672. [40 CFR 60 Subpart OOO] II.B.4 The owner/operator shall comply with the following requirements when generator engines
are supplying power to the Concrete Batch Plant.
II.B.4.a The owner/operator shall not operate the facility, except the concrete batch plant, before 6:00 am or after 6:00 pm. [R307-401-8]
II.B.4.b The owner/operator shall not operate the concrete batch plant before 4:00 am or after 6:00 pm or
for more than 10 hours per day during the months of June through August. [R307-401-8]
II.B.4.c The owner/operator shall not operate the concrete batch plant before 8:00 am or after 4:00 pm or for more than 8 hours per day during the months of December through February. [R307-401-8] II.B.4.d The owner/operator shall not operate the concrete batch plant before 6:00 am or after 5:00 pm or
for more than 9 hours per day during the months of March through May and September through
November. [R307-401-8]
II.B.4.e The owner/operator shall not operate the 400 kW Generator Engine and the 455 kW Generator Engine at the same time. [R307-401-8] II.B.4.f The 150 kW natural gas generator engine and the 200 kW diesel-fueled generator engine shall
not operate at the same time. [R307-401-8]

II.B.4.f.1 The owner/operator shall: A. Determine the hours of operation with supervisor monitoring and maintenance of an operations log. B. Record the start and end times and the hours of operation on a daily basis for the concrete batch plant and all other equipment on site. C. Keep the records for all periods when the plant is in operation. [R307-401-8, R307-410-4]
II.B.5 The owner/operator shall comply with the following requirements when line power supplies
the electrical power to the Concrete Batch Plant.
II.B.5.a The owner/operator shall not operate the concrete batch plant before 4:00 am or after 10:00 pm or for more than 10 hours per day during the months of June through August. [R307-401-8]
II.B.5.b The owner/operator shall not operate the facility, except the concrete batch plant, before 6:00 am
or after 10:00 pm. [R307-401-8]

DAQE-AN120660006-24
Page 12

II.B.5.c The owner/operator shall not operate the concrete batch plant before 6:00 am or after 10:00 pm or for more than 10 hours per day during the months of September through June. [R307-401-8] II.B.5.d The 150 kW natural gas generator engine and the 200 kW diesel-fueled generator engine shall not operate during times when line power is used for the concrete batch plant. [R307-401-8]

II.B.5.d.1 The owner/operator shall: A. Determine the hours of operation with supervisor monitoring and maintenance of an operations log. B. Record the start and end times, and the hours of operation on a daily basis for the concrete batch plant and all other equipment on site. C. Keep the records for all periods when the plant is in operation. [R307-401-8, R307-410-4]
II.B.6 Truck-Mix Concrete Batch Plant
II.B.6.a The owner/operator shall not produce more than 224,640 cubic yards of concrete per rolling 12-month period. [R307-401-8]
II.B.6.a.1 The owner/operator shall:
A. Determine production in hours of operation with each generator engine.
B. Record production on a daily basis.

C. Use each production data to calculate a new rolling 12-month total by the 20th day of each month using data from the previous 12 months.

D. Keep the production records for all periods the plant is in operation.
[R307-401-8]

II.B.6.b The owner/operator shall install and operate a baghouse to control particulate emissions from each of the cement and fly ash silos during filling of the silos and truck loading operations. [R307-401-8] II.B.7 Generator Engines
II.B.7.a The owner/operator shall install a 150 kW (226 hp) generator engine that is certified to meet the following emission standards: A. NOx - 1.0 g/hp-hr. B. CO - 2.0 g/hp-hr. C. VOC - 0.7 g/hp-hr. [40 CFR 60 Subpart JJJJ, R307-401-8]
II.B.7.a.1 The owner/operator shall keep a record of the manufacturer's certification of the emission rate.
The record shall be kept for the life of the equipment. [R307-401-8]

II.B.7.b The owner/operator shall only combust diesel fuel that meets the definition of ultra-low sulfur diesel (ULSD), which has a sulfur content of 15 ppm or less. [R307-401-8]
DAQE-AN120660006-24
Page 13

II.B.7.c 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.7.d The 400 kW (536 hp) generator engine shall be subject to the following emission standard in 40 CFR 63 Subpart ZZZZ:
A. Limit CO concentrations to 23 ppmvd or reduce CO emissions by 70 % or more. [40 CFR 63 Subpart ZZZZ, R307-401-8]

II.B.7.d.1 Initial performance tests shall be conducted as per 40 CFR 63.6612. Subsequent performance tests shall be conducted every 8,760 hours or three (3) years, whichever comes first, as per Table 3 of 40 CFR 63 Subpart ZZZZ. Additional requirements in 40 CFR 63 Subpart ZZZZ may apply to this engine. [40 CFR 63 Subpart ZZZZ, R307-401-8]
II.B.7.e The 455 kW (610 hp) generator engine shall meet all applicable requirements in 40 CFR 60
Subpart IIII and shall be certified to meet the following emission standards: 0.01 g/kW-hr of PM, 3.5 g/kW-hr of NOx, 3.5 g/kW-hr of CO, and 0.4 g/kW-hr of NMHC.
[40 CFR 60 Subpart IIII, R307-401-8]

II.B.7.e.1 To demonstrate compliance with the above conditions, the owner/operator shall either: A. Purchase a manufacturer-certified Tier IV engine, or B. Conduct an initial performance test to demonstrate exhaust emission standards according to 40 CFR 1039.240. [40 CFR 60 Subpart IIII, R307-401-8]
II.B.7.e.2 The owner/operator shall maintain records of engine certification or the initial performance test. [40 CFR 60 Subpart IIII, R307-401-8]

II.B.7.f The 200 kW (268 hp) and the 183 kW (245 hp) diesel engines shall be subject to the following requirements in 40 CFR 63 Subpart ZZZZ: A. Change oil and filter every 1,000 hours of operation or annually, whichever comes first. B. Inspect air cleaner every 1,000 hours of operation or annually, whichever comes first, and replace as necessary. C. Inspect all hoses and belts every 500 hours of operation or annually, whichever comes first, and replace as necessary. Additional requirements in 40 CFR 63 Subpart ZZZZ may apply to this engine. [40 CFR 63 Subpart ZZZZ, R307-401-8]

DAQE-AN120660006-24
Page 14

PERMIT HISTORY

This Approval Order shall supersede (if a modification) or will be based on the following documents: Supersedes AO DAQE-AN120660005-22 dated May 12, 2022 Is Derived From NOI dated November 16, 2022 Incorporates Additional information dated May 2, 2023 Incorporates Additional information dated November 16, 2023 Incorporates Additional information dated December 21, 2023 Incorporates Additional information dated January 25, 2024 Incorporates Additional information dated April 4, 2024 Incorporates Additional information dated April 24, 2024 Incorporates DAQE-MN120660006A-24 dated June 4, 2024

DAQE-AN120660006-24
Page 15

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-IN120660006-24

October 10, 2024

Randa Hawley
Hawley Rock Products, Inc.
760 South 1400 West
Annabella, UT 84711
[e-mail]

Dear Ms. Hawley:

Re: Intent to Approve: Modification to Approval Order DAQE-AN120660005-22 to Add a
Generator Engine
Project Number: N120660006

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, Mr. Tim DeJulis, as well as the
DAQE number as shown on the upper right-hand corner of this letter. Mr. Tim DeJulis, can be reached at
[phone] or [e-mail], if you have any questions.

Sincerely,

{{$s }}

Alan D. Humpherys, Manager
New Source Review Section

ADH:TD:jg

cc: Central Utah Health Department

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

STATE OF UTAH
Department of Environmental Quality
Division of Air Quality

INTENT TO APPROVE
DAQE-IN120660006-24
Modification to Approval Order DAQE-AN120660005-22
to Add a Generator Engine

Prepared By
Mr. Tim DeJulis, Engineer
[phone]
[e-mail]

Issued to
Hawley Rock Products, Inc. - Crushing and Screening Operation

Issued On
October 10, 2024

{{$s }}

New Source Review Section Manager
Alan D. Humpherys
{{#s=Sig_es_:signer1:signature}}

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 .................................................................................................... 4
PUBLIC NOTICE STATEMENT............................................................................................... 4
SECTION I: GENERAL PROVISIONS .................................................................................... 4
SECTION II: PERMITTED EQUIPMENT .............................................................................. 5
SECTION II: SPECIAL PROVISIONS ..................................................................................... 8
PERMIT HISTORY ................................................................................................................... 14
ACRONYMS ............................................................................................................................... 15

DAQE-IN120660006-24
Page 3

GENERAL INFORMATION

CONTACT/LOCATION INFORMATION

Owner Name Source Name
Hawley Rock Products, Inc. Hawley Rock Products, Inc. - Crushing and Screening Operation

Mailing Address Physical Address
760 South 1400 West 780 West 1400 South
Annabella, UT 84711 Elsinore, UT 84724

Source Contact UTM Coordinates
Name: Randa Hawley 398,850 m Easting
Phone: [phone],280,130 m Northing
Email: [e-mail] Datum NAD83
UTM Zone 12
SIC code 1442 (Construction Sand & Gravel)

SOURCE INFORMATION
General Description
Hawley Rock Products, Inc. (Hawley) operates an aggregate processing plant in Elsinore in Sevier
County. Operations include aggregate mining, crushing, screening, and hauling. Diesel and natural
gas-fueled generator engines provide power to the onsite equipment. Annual aggregate production is
limited to 875,000 tons.

NSR Classification
Minor Modification at Minor Source
Source Classification
Located in Attainment Area
Sevier County
Airs Source Size: B
Applicable Federal Standards
NSPS (Part 60), A: General Provisions
NSPS (Part 60), OOO: Standards of Performance for Nonmetallic Mineral Processing Plants
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
Title V (Part 70) Area Source
DAQE-IN120660006-24
Page 4

Project Description
Hawley has requested a modification to AO DAQE-AN120660005-22, dated May 12, 2022, to add a 226
hp natural gas-fueled generator engine to the site. Hawley will have the use of electric power to generate
power for the CBP at some point in the future.

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 333 4883.00
Carbon Monoxide 1.87 11.43
Nitrogen Oxides 0.93 29.34
Particulate Matter - PM10 0.03 8.59
Particulate Matter - PM2.5 0.03 3.20
Sulfur Dioxide 0 1.85
Volatile Organic Compounds 0.65 3.10

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Total HAPs (CAS #THAPS) 420 540
Change (TPY) Total (TPY)
Total HAPs 0.21 0.27

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 Richfield Reaper on October 16, 2024. 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]
DAQE-IN120660006-24
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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 two-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 two (2) 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]

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 Hawley Crushing and Screening Plant (Manufacturers' names are listed for identification purposes only) II.A.2 Pioneer Roll Crusher - 54 x 24 Rating: 154 TPH Manufacture Date: 1951 Associated Engine
Rated Capacity: 245 hp Manufacture Date: prior to 1973 MACT 40 CFR 63 Subpart ZZZZ Equipment

II.A.3 Symons Cone Crusher Rating: 145 TPH Manufacture Date: 1951 II.A.4 Cedarapids Roll Crusher - 40 x 24 Rating: 154 TPH
Manufacture Date: 1954
DAQE-IN120660006-24
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II.A.5 Pioneer Jaw Crusher - 10 x 36 Rating: 440 THP Manufacture Date: 1959 II.A.6 Nordberg Cone Crusher
Rating: 220 THP Manufacture Date: 1967
II.A.7 Pioneer Roll Crusher - 30 x 40 Rating: 154 TPH Manufacture Date: 1968
II.A.8 Eagle Jaw Crusher - 20 x 36 Rating: 600 TPH Manufacture Date: 1968

II.A.9 Telsmith Cone Crusher - 6 x 16 Rating: 205 THP Manufacture Date: 1970 II.A.10 Cedarapids Jaw Crusher - 16 x 48
Rating: 500 TPH
Manufacture Date: 1970
II.A.11 Cedarapids Jaw Crusher - 18 x 36 Rating: 140 TPH Manufacture Date: 1971
II.A.12 El Jay Cone Crusher - 54"
Rating: 330 TPH Manufacture Date: 1979

II.A.13 Acrowood Impact Crusher Rating: 145 TPH Manufacture Date: 1987 NSPS Subpart OOO Equipment II.A.14 Nordberg Cone Crusher
Rating: 400 THP
Manufacture Date: 1993 NSPS Subpart OOO Equipment

II.A.15 Cedarapids Jaw Crusher - 30 x 42 Rating: 600 THP Manufacture Date: Unknown NSPS Subpart OOO Equipment
II.A.16 Cedarapids Screen Plant - 4 x 14 and 4 x 12
Twin screens
Manufacture Date: 1965

II.A.17 El Jay Screen - 6 x 20 Manufacture Date: 1979
II.A.18 El Jay Screen - 6 x 16
Manufacture Date: 1983
NSPS Subpart OOO Equipment

DAQE-IN120660006-24
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II.A.19 El Jay Screen - 6 x 16 Manufacture Date: 1983 NSPS Subpart OOO Equipment II.A.20 El Jay Screen Plant - 6 x 16
Manufacture Date: 1983 NSPS Subpart OOO Equipment
II.A.21 El Jay Screen Plant - 6 x 16 Twin Screens Manufacture Date: 1985 NSPS Subpart OOO Equipment II.A.22 El Jay Screen Plant - 6 x 20 Manufacture Date: 1988
NSPS Subpart OOO Equipment
II.A.23 JCI Screen - 6 x 20 Manufacture Date: 1997 NSPS Subpart OOO Equipment
II.A.24 Simplicity Screen - 6 x 20
Manufacture Date: 1997 NSPS Subpart OOO Equipment

II.A.25 Screens (chip wash) Listed for informational purposes only
II.A.26 Diesel Generator Engine
Rating: 400 kW (536 hp) Manufacture Date: 1976
MACT Subpart ZZZZ

II.A.27 Diesel Generator Engine Rating: 200 kW (268 hp) Manufacture Date: 1977 MACT Subpart ZZZZ
II.A.28 Diesel Generator Engine
Rating: 455 kW (610 hp) Manufacture Date: 2015
NSPS Subpart IIII
MACT Subpart ZZZZ
II.A.29 Natural Gas Generator Engine (new) Rating: 150 kW (226 hp) Manufacture Date: 2022 NSPS Subpart JJJJ MACT Subpart ZZZZ
II.A.30 Conveyors and Stacks
Various conveyors and stacks
Manufacture Date: pre-2008
NSPS Subpart OOO Equipment

DAQE-IN120660006-24
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II.A.31 One (1) Truck-Mix Concrete Batch Plant The plant is rated at 80 cubic yards/hr of concrete Major equipment includes: Sand and aggregate hoppers and storage bins Conveyors Cement and fly ash silos and associated baghouses Concrete mixing trucks

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 Requirements II.B.1.a The owner/operator shall not produce more than 875,000 tons of processed aggregate per rolling 12-month period. [R307-401-8]
II.B.1.a.1 The owner/operator shall: A. Determine production with belt scale records, scale house records, or bucket scale records. B. Record production on a daily basis. C. Use the production data to calculate a new rolling 12-month total by the 20th day of each month using the data from the previous 12 months. D. Keep the production records for all periods the plant is in operation. [R307-401-8] II.B.1.b The owner/operator shall not produce more than 350 tons of aggregate per hour. [R307-401-8]
II.B.1.b.1 The owner/operator shall: A. Comply with the limit using data generated from a load cell monitor and associated software. B. Keep the records of hourly production for all periods when the plant is in operation. [R307-401-8]
DAQE-IN120660006-24
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II.B.1.c The owner/operator shall not operate the generator engines on site for more than the following limits: A. 200 hours per rolling 12-month period for the 245-hp generator engine (II.A.2). B. 2,500 hours per rolling 12-month period for the 400-kW generator engine (II.A.26). C. 600 hours per rolling 12-month period for the 200-kW generator engine (II.A.27). D. 2,500 hours per rolling 12-month period for the 455-kW generator engine (II.A.28). E. 3,744 hours per rolling 12-month period for the 150-kW generator engine (II.A.29). [R307-401-8] II.B.1.c.1 The owner/operator shall:

A. Determine the hours of operation with a supervisor monitoring and maintenance of an operations log.

B. Record the hours of operation daily.
C. Use the hours of operation to calculate a new rolling 12-month total by the 20th day of
each month using data from the previous 12 months.
D. Keep the hours of operation records for all periods when the plant is in operation.
[R307-401-8]

II.B.1.d The owner/operators shall limit operations to the following number of units at one time: A. Two (2) screens; B. One (1) fines screen; and C. Four (4) crushers. [R307-401-8]
II.B.1.d.1 Records of plant configuration shall be kept on a weekly basis for all periods when the plant is in operation. [R307-401-8]

DAQE-IN120660006-24
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II.B.1.e The owner operator shall not allow visible emissions from the following emission points to exceed the following values: A. All crushers - 15% opacity. B. All screens - 10% opacity. C. All conveyor transfer points - 10% opacity. D. All diesel engines - 20% opacity. E. All natural gas engines - 10% opacity. F. All conveyor drop points - 20% opacity. G. The truck-mix concrete batch plant and associated equipment - 10% opacity. H. All other fugitive dust emissions - 20% opacity. [40 CFR 60 Subpart OOO, R307-205, R307-401-8] II.B.1.e.1 Opacity observations of emissions from stationary sources shall be conducted according to 40
CFR 60, Appendix A, Method 9. [R307-401-8]

II.B.2 Roads and Fugitive Dust II.B.2.a The owner/operator shall not allow visible fugitive dust emissions from haul-road traffic, mobile
equipment, and all other sources in operational areas to exceed 20% opacity on site.
[R307-401-8]
II.B.2.a.1 Visible emission determinations for fugitive dust from haul roads and operational areas shall use procedures similar to Method 9. The normal requirement for observations to be made at 15-second intervals over a six-minute period, however, shall not apply. 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.b The owner/operator shall use water application and chemical suppressant on all haul roads and
operational areas used by mobile equipment to maintain opacity limits listed in this AO. The
owner/operator may stop applying water to the haul roads and operational areas when the temperature is below freezing. [R307-401-8]

II.B.2.c The owner/operator shall apply water to all storage piles on site to control fugitive emissions. Sprays shall operate as required to maintain the opacity limits listed in this AO when the temperature is above freezing. Records of water treatment shall be kept for all periods when the plant is in operation. [R307-401-8]
DAQE-IN120660006-24
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II.B.2.c.1 Records of water and chemical suppressant application on all haul roads and operational areas used by mobile equipment shall be kept for all periods when the plant is in operation. The records shall include the following items: A. Date and time treatments were made. B. Number of treatments made and quantity of water applied. C. Rainfall amount received, if any. D. Records of temperature, if the temperature is below freezing. [R307-401-8]
II.B.2.d The owner/operator shall not exceed 3 acres of total area of storage piles on site. [R307-401-8]
II.B.3 Aggregate Processing Equipment
II.B.3.a The owner/operator shall install water sprays on all crushers, all screens, all conveyor transfer
points, and all conveyor drop points on site to control emissions. Sprays shall operate as required to maintain the opacity limits listed in this AO when the temperature is above freezing.
[40 CFR 60 Subpart OOO, R307-401-8]

II.B.3.b The owner/operator shall perform monthly periodic inspections to check that water is flowing to discharge spray nozzles associated with each crusher, screen, and conveyor. If the owner/operator finds that water is not flowing properly during an inspection of the water spray nozzles, the owner/operator shall initiate corrective action within 24 hours and complete corrective action as expediently as practical. [40 CFR 60 Subpart OOO, R307-401-8]
II.B.3.b.1 Records of the water sprays inspections shall be kept and maintained in a logbook for all periods when the plant is in operation. The records shall include the following items:

A. Date the inspections were made.
B. Any corrective actions taken.
C. Control mechanism used if sprays are not operating.

[40 CFR 60 Subpart OOO, R307-401-8]
II.B.3.c The owner/operator shall conduct an initial performance test for all crushers, screens, and conveyor transfer points listed as new in this AO and subject to 40 CFR 60 Subpart OOO within 60 days after achieving the maximum production rate but not later than 180 days after initial startup. Performance tests shall meet the limitations specified in Table 3 to Subpart OOO. Records of initial performance tests shall be kept and maintained with the equipment for the life of the equipment. [40 CFR 60 Subpart OOO]
II.B.3.c.1 Initial performance tests for fugitive emissions limits shall be conducted according to 40 CFR
60.675(c). The owner/operator may use methods and procedures specified in 40 CFR 60.675(e)
as alternatives to the reference methods and procedures specified in 40 CFR 60.675(c).
[40 CFR 60 Subpart OOO]

II.B.3.d The owner/operator shall submit written reports to the Director of the results of all performance tests conducted to demonstrate compliance with the standards set forth in 40 CFR 60.672. [40 CFR 60 Subpart OOO]
II.B.4 The owner/operator shall comply with the following requirements when generator engines
are supplying power to the Concrete Batch Plant.

DAQE-IN120660006-24
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II.B.4.a The owner/operator shall not operate the facility, except the concrete batch plant, before 6:00 am or after 6:00 pm. [R307-401-8] II.B.4.b The owner/operator shall not operate the concrete batch plant before 4:00 am or after 6:00 pm or for more than 10 hours per day during the months of June through August. [R307-401-8]

II.B.4.c The owner/operator shall not operate the concrete batch plant before 8:00 am or after 4:00 pm or for more than 8 hours per day during the months of December through February. [R307-401-8]
II.B.4.d The owner/operator shall not operate the concrete batch plant before 6:00 am or after 5:00 pm or for more than 9 hours per day during the months of March through May and September through November. [R307-401-8]

II.B.4.e The owner/operator shall not operate the 400 kW Generator Engine and the 455 kW Generator Engine at the same time. [R307-401-8]
II.B.4.f The 150 kW natural gas generator engine and the 200 kw diesel-fueled generator engine shall not operate at the same time. [R307-401-8]

II.B.4.f.1 The owner/operator shall: A. Determine the hours of operation with supervisor monitoring and maintenance of an operations log. B. Record the start and end times and the hours of operation on a daily basis for the concrete batch plant and all other equipment on site. C. Keep records for all periods when the plant is in operation. [R307-401-8, R307-410-4]
II.B.5 The owner/operator shall comply with the following requirements when line power supplies
the electrical power to the Concrete Batch Plant.
II.B.5.a The owner/operator shall not operate the concrete batch plant before 4:00 am or after 10:00 pm or for more than 10 hours per day during the months of June through August. [R307-401-8] II.B.5.b The owner/operator shall not operate the facility, except the concrete batch plant, before 6:00 am
or after 10:00 pm. [R307-401-8]

II.B.5.c The owner/operator shall not operate the concrete batch plant before 6:00 am or after 10:00 pm or for more than 10 hours per day during the months of September through June. [R307-401-8]
II.B.5.d The 150 kW natural gas generator engine and the 200 kW diesel-fueled generator engine shall not operate during times when line power is used for the concrete batch plant. [R307-401-8]

II.B.5.d.1 The owner/operator shall: A. Determine the hours of operation with supervisor monitoring and maintenance of an operations log. B. Record the start and end times and the hours of operation on a daily basis for the concrete batch plant and all other equipment on site. C. Keep records for all periods when the plant is in operation. [R307-401-8, R307-410-4]
DAQE-IN120660006-24
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II.B.6 Truck-Mix Concrete Batch Plant II.B.6.a The owner/operator shall not produce more than 224,640 cubic yards of concrete per rolling
12-month period. [R307-401-8]
II.B.6.a.1 The owner/operator shall: A. Determine production in hours of operation with each generator engine. B. Record production on a daily basis. C. Use each production data to calculate a new rolling 12-month total by the 20th day of each month using data from the previous 12 months. D. Keep the production records for all periods the plant is in operation. [R307-401-8]
II.B.6.b The owner/operator shall install and operate a baghouse to control particulate emissions from
each of the cement and fly ash silos during filling of the silos and truck loading operations. [R307-401-8]

II.B.7 Generator Engines
II.B.7.a The owner/operator shall install a 150 kW (226 hp) generator engine that is certified to meet the following emission standards:

A. NOx - 1.0 g/hp-hr.
B. CO - 2.0 g/hp-hr.
C. VOC - 0.7 g/hp-hr.

[40 CFR 60 Subpart JJJJ, R307-401-8]
II.B.7.a.1 The owner/operator shall keep a record of the manufacturer's certification of the emission rate. The record shall be kept for the life of the equipment. [R307-401-8] II.B.7.b The owner/operator shall only combust diesel fuel that meets the definition of ultra-low sulfur
diesel (ULSD), which has a sulfur content of 15 ppm or less. [R307-401-8]

II.B.7.c 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.7.d The 400 kW (536 hp) generator engine shall be subject to the following emission standard in 40
CFR 63 Subpart ZZZZ:

A. Limit CO concentrations to 23 ppmvd or reduce CO emissions by 70 percent or more.

[40 CFR 63 Subpart ZZZZ, R307-401-8]

II.B.7.d.1 Initial performance tests shall be conducted as per 40 CFR 63.6612. Subsequent performance tests shall be conducted every 8,760 hours or 3 years, whichever comes first, as per Table 3 of 40 CFR 63 Subpart ZZZZ. Additional requirements in 40 CFR 63 Subpart ZZZZ may apply to this engine. [40 CFR 63 Subpart ZZZZ, R307-401-8]
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II.B.7.e The 455 kW (610 hp) generator engine shall meet all applicable requirements in 40 CFR 60 Subpart IIII and shall be certified to meet the following emission standards: 0.01 g/kW-hr of PM, 3.5 g/kW-hr of NOx, 3.5 g/kW-hr of CO, and 0.4 g/kW-hr of NMHC. [40 CFR 60 Subpart IIII, R307-401-8]
II.B.7.e.1 To demonstrate compliance with the above conditions, the owner/operator shall either: A. Purchase a manufacturer-certified Tier IV engine, or
B. Conduct an initial performance test to demonstrate exhaust emission standards according to 40 CFR 1039.240.
[40 CFR 60 Subpart IIII, R307-401-8]
II.B.7.e.2 The owner/operator shall maintain records of engine certification or the initial performance test. [40 CFR 60 Subpart IIII, R307-401-8]
II.B.7.f The 200 kW (268 hp) and the 183 kW (245 hp) diesel engines shall be subject to the following
requirements in 40 CFR 63 Subpart ZZZZ:
A. Change oil and filter every 1,000 hours of operation or annually, whichever comes first;
B. Inspect air cleaner every 1,000 hours of operation or annually, whichever comes first,
and replace as necessary;
C. Inspect all hoses and belts every 500 hours of operation or annually, whichever comes
first, and replace as necessary.
Additional requirements in 40 CFR 63 Subpart ZZZZ may apply to this engine.

[40 CFR 63 Subpart ZZZZ, R307-401-8]

PERMIT HISTORY

This Approval Order shall supersede (if a modification) or will be based on the following documents:
Supersedes AO DAQE-AN120660005-22 dated May 12, 2022 Is Derived From NOI dated November 16, 2022 Incorporates Additional information dated May 2, 2023 Incorporates Additional information dated November 16, 2023 Incorporates Additional information dated December 21, 2023 Incorporates Additional information dated January 25, 2024 Incorporates Additional information dated April 4, 2024 Incorporates Additional information dated April 24, 2024 Incorporates DAQE-MN120660006A-24 dated June 4, 2024
DAQE-IN120660006-24
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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

Richfield Reaper
Publication Name:
Richfield Reaper
Publication URL:
Publication City and State:
Richfield, UT
Publication County:
Sevier
Notice Popular Keyword Category:
Notice Keywords:
hawley
Notice Authentication Number:
202410161252286832923
1761527914
Notice URL:
Back
Notice Publish Date:
Wednesday, October 16, 2024
Notice Content
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: Location: Hawley Rock Products, Inc. Hawley Rock Products, Inc. - Crushing and
Screening Operation - 780 West 1400 South, Elsinore, UT Project Description: Hawley has requested a modification to Approval Order DAQE-
AN120660005-22, dated May 12, 2022, to add a 226 hp natural gas-fueled generator engine to the site. Hawley will have the use of electric
power to generate power for the CBP at some point in the future. 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 November 15, 2024, 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: October 16, 2024
Back

DAQE-NN120660006-24

October 10, 2024

Richfield Reaper
Legal Advertising Dept.
65 W Center
P.O. Box 730
Richfield, UT 84701

RE: Legal Notice of Intent to Approve

This letter will confirm the authorization to publish the attached NOTICE in the Richfield Reaper on
October 16, 2024.

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: Six County Association of Governments
cc: Sevier County

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-NN120660006-24
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: Hawley Rock Products, Inc.
Location: Hawley Rock Products, Inc. - Crushing and Screening Operation – 780 West
1400 South, Elsinore, UT
Project Description: Hawley has requested a modification to Approval Order
DAQE-AN120660005-22, dated May 12, 2022, to add a 226 hp
natural gas-fueled generator engine to the site. Hawley will have
the use of electric power to generate power for the CBP at some
point in the future.

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 November 15, 2024, 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: October 16, 2024

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

DAQE-

RN120660006 September 17, 2024 Randa Hawley Hawley Rock Products, Inc. 760 South 1400 West
Annabella, UT 84711 [e-mail]
Dear Randa Hawley, Re: Engineer Review:
Modification to Approval Order DAQE-AN120660005-22 to Add a Generator Engine Project Number: N120660006 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. Hawley Rock Products, Inc. should complete this review within 10 business days of receipt. Hawley Rock Products, Inc. should contact Mr. Tim DeJulis at [phone] if there are questions or concerns with the review of the draft permit conditions. Upon resolution of your concerns, please email Mr. Tim DeJulis 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 Hawley Rock Products, Inc. does not respond to this letter within 10 business days, the project will move forward without source concurrence. If Hawley Rock Products, Inc. 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 N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 1
UTAH DIVISION OF AIR QUALITY
ENGINEER REVIEW

SOURCE INFORMATION
Project Number N120660006 Owner Name Hawley Rock Products, Inc. Mailing Address 760 South 1400 West
Annabella, UT, 84711 Source Name Hawley Rock Products - Crushing and Screening Operation
Source Location 780 West 1400 South Elsinore, UT 84724
UTM Projection 398,850 m Easting, 4,280,130 m Northing UTM Datum NAD83 UTM Zone UTM Zone 12 SIC Code 1442 (Construction Sand & Gravel) Source Contact Randa Hawley Phone Number [phone] Email [e-mail] Billing Contact Randa Hawley Phone Number [phone]
Email [e-mail] Project Engineer Mr. Tim DeJulis, Engineer
Phone Number [phone] Email [e-mail]
Notice of Intent (NOI) Submitted November 16, 2022 Date of Accepted Application February 13, 2023

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 2
SOURCE DESCRIPTION General Description
Hawley Rock Products, Inc. (Hawley) operates an aggregate processing plant in Elsinore in Sevier County. Operations include aggregate mining, crushing, screening, and hauling. Diesel and natural gas fueled generator engines provide power to the onsite equipment. Annual
aggregate production is limited to 875,000 tons. NSR Classification: Minor Modification at Minor Source Source Classification Located in Attainment Area Sevier County Airs Source Size: B Applicable Federal Standards
NSPS (Part 60), A: General Provisions NSPS (Part 60), OOO: Standards of Performance for Nonmetallic Mineral Processing Plants 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 Title V (Part 70) Area Source Project Proposal
Modification to Approval Order DAQE-AN120660005-22 to Add a Generator Engine Project Description Hawley has requested a modification to AO DAQE-AN120660005-22, dated May 12, 2022 to add a 226 hp natural gas fueled generator engine to the site. Hawley will have the use of electric power to generate power for the CBP, at some point in the future.

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 3
EMISSION IMPACT ANALYSIS All criteria pollutants increases are below the modeling thresholds contained in R307-410-4. Modeling was
conducted for PM10 and NOx. All HAP emissions are below their respective emission threshold values in R307-410-5. The modeling analysis results for PM10 and NOx are shown below: Pollutant Period Prediction Percent (µg/m3) PM10 24-Hour 58.21 70.3
NOx was estimated by DAQs modelers under two scenarios: diesel fired engines only supplying power to the Elsinore CBP or Rocky Mountain power supplying power to the CBP.
No Line Power Used Pollutant Period Prediction Percent (µg/m3)
NOx 1-Hour 130.0 94.88
• With the exception of the concrete batch plant (CBP), the facility shall be permitted to operate between the hours of 6 am and 6 pm.
• The CBP shall be allowed to operate for 10 hours between the hours of 4 am and 6 pm during the months of June, July, and August. • The CBP shall be allowed to operate for 8 hours between the hours of 8 am and 4 pm during the winter
months of the year (December through February). • The CBP shall be allowed to operate for 9 hours between the hours of 6 am and 5 pm during the remaining months of the year (March thru May and September through November). • The 400 kw and 455 kw generators shall not operate at the same time. • The new natural gas and 200 kw generators shall not operate at the same time
Line Power Used Pollutant Period Prediction Percent
(µg/m3) NOx 1-Hour 39.2 88.03
• With the exception of the concrete batch plant (CBP), the facility shall be permitted to operate between the hours of 6 am and 10 pm. • The CBP shall be allowed to operate for 10 hours between the hours of 4 am and 10 pm during the months of June, July, and August. • The CBP shall be allowed to operate for 10 hours between the hours of 6 am and 10 pm during the remaining months of the year (September through June). • The new natural gas and 200 kw generators shall not operate during times when line power is used for the CBP. [Last updated September 12, 2024]

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 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 333 4883.00 Carbon Monoxide 1.87 11.43
Nitrogen Oxides 0.93 29.34
Particulate Matter - PM10 0.03 8.59
Particulate Matter - PM2.5 0.03 3.20
Sulfur Dioxide 0 1.85
Volatile Organic Compounds 0.65 3.10 Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Total HAPs (CAS #THAPS) 420 540
Change (TPY) Total (TPY)
Total HAPs 0.21 0.27

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

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 5
Review of BACT for New/Modified Emission Units 1. BACT review regarding Process Equipment
The natural gas-fueled generator engine is rated at 150 kW (226 hp). The generator engine emissions will meet 1.0 g/hp-hr NOx, 2.0 g/hp-hr CO, and 0.70 g/hp-hr VOC. This is economically feasible and selected as BACT. The source will be limited to a 10% opacity standard. The source
has proposed to operate the generator engine for no more than 3,744 hours per year. Other control options are not cost effective for this engine. [Last updated September 10, 2024]
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 two-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 two (2) 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 N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 6
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 Hawley Crushing and Screening Plant (Manufacturers' names are listed for identification purposes only)
II.A.2 Pioneer Roll Crusher - 54 x 24 Rating: 154 TPH Manufacture Date: 1951
Associated Engine
Rated Capacity: 245 hp Manufacture Date: prior to 1973 MACT 40 CFR 63 Subpart ZZZZ Equipment
II.A.3 Symons Cone Crusher Rating: 145 TPH Manufacture Date: 1951

II.A.4 Cedarapids Roll Crusher - 40 x 24 Rating: 154 TPH Manufacture Date: 1954
II.A.5 Pioneer Jaw Crusher - 10 x 36
Rating: 440 THP Manufacture Date: 1959
II.A.6 Nordberg Cone Crusher
Rating: 220 THP Manufacture Date: 1967
II.A.7 Pioneer Roll Crusher - 30 x 40 Rating: 154 TPH Manufacture Date: 1968
II.A.8 Eagle Jaw Crusher - 20 x 36 Rating: 600 TPH Manufacture Date: 1968 II.A.9 Telsmith Cone Crusher - 6 x 16 Rating: 205 THP
Manufacture Date: 1970 II.A.10 Cedarapids Jaw Crusher - 16 x 48 Rating: 500 TPH
Manufacture Date: 1970

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 7
II.A.11 Cedarapids Jaw Crusher - 18 x 36 Rating: 140 TPH Manufacture Date: 1971

II.A.12 El Jay Cone Crusher - 54" Rating: 330 TPH Manufacture Date: 1979
II.A.13 Acrowood Impact Crusher
Rating: 145 TPH Manufacture Date: 1987 NSPS Subpart OOO Equipment
II.A.14 Nordberg Cone Crusher Rating: 400 THP Manufacture Date: 1993
NSPS Subpart OOO Equipment II.A.15 Cedarapids Jaw Crusher - 30 x 42 Rating: 600 THP Manufacture Date: Unknown NSPS Subpart OOO Equipment
II.A.16 Cedarapids Screen Plant - 4 x 14 and 4 x 12 Twin screens Manufacture Date: 1965 II.A.17 El Jay Screen - 6 x 20 Manufacture Date: 1979

II.A.18 El Jay Screen - 6 x 16 Manufacture Date: 1983 NSPS Subpart OOO Equipment

II.A.19 El Jay Screen - 6 x 16 Manufacture Date: 1983 NSPS Subpart OOO Equipment
II.A.20 El Jay Screen Plant - 6 x 16
Manufacture Date: 1983 NSPS Subpart OOO Equipment
II.A.21 El Jay Screen Plant - 6 x 16
Twin Screens Manufacture Date: 1985 NSPS Subpart OOO Equipment

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 8
II.A.22 El Jay Screen Plant - 6 x 20 Manufacture Date: 1988 NSPS Subpart OOO Equipment

II.A.23 JCI Screen - 6 x 20 Manufacture Date: 1997 NSPS Subpart OOO Equipment
II.A.24 Simplicity Screen - 6 x 20
Manufacture Date: 1997 NSPS Subpart OOO Equipment
II.A.25 Screens (chip wash) Listed for informational purposes only II.A.26 Diesel Generator Engine Rating: 400 kW (536 hp) Manufacture Date: 1976 MACT Subpart ZZZZ II.A.27 Diesel Generator Engine Rating: 200 kW (268 hp) Manufacture Date: 1977 MACT Subpart ZZZZ
II.A.28 Diesel Generator Engine
Rating: 455 kW (610 hp) Manufacture Date: 2015 NSPS Subpart IIII
MACT Subpart ZZZZ II.A.29 NEW Natural Gas Generator Engine (new) Rating: 150 kW (226 hp)
Manufacture Date: 2022 NSPS Subpart JJJJ MACT Subpart ZZZZ

II.A.30 Conveyors and Stacks Various conveyors and stacks Manufacture Date: pre-2008
NSPS Subpart OOO Equipment II.A.31 One (1) Truck-Mix Concrete Batch Plant The plant is rated at 80 cubic yard/hr of concrete Major equipment includes: Sand and aggregate hoppers and storage bins Conveyors
Cement and fly ash silos and associated baghouses Concrete mixing trucks

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 9

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 Requirements II.B.1.a The owner/operator shall not produce more than 875,000 tons of processed aggregate per rolling 12-month period. [R307-401-8]
II.B.1.a.1 NEW The owner/operator shall:
A. Determine production with belt scale records, scale house records, or bucket scale records B. Record production on a daily basis
C. Use the production data to calculate a new rolling 12-month total by the 20th day of each month using the data from the previous 12 months D. Keep the production records for all periods the plant is in operation. [R307-401-8]
II.B.1.b The owner/operator shall not produce more than 350 tons of aggregate per hour. [R307-401-8] II.B.1.b.1 The owner/operator shall: A. Comply with the limit using data generated from a load cell monitor and associated software B. Keep the records of hourly production for all periods when the plant is in operation.
[R307-401-8]

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 10
II.B.1.c NEW The owner/operator shall not operate the generator engines on site for more than the following limits: A. 200 hours per rolling 12-month period for the 245-hp generator engine (II.A.2) B. 2,500 hours per rolling 12-month period for the 400-kW generator engine (II.A.26) C. 600 hours per rolling 12-month period for the 200-kW generator engine (II.A.27) D. 2,500 hours per rolling 12-month period for the 455-kW generator engine (II.A.28) E. 3,744 hours per rolling 12-month period for the 150-kW generator engine (II.A.29). [R307-401-8]

II.B.1.c.1 NEW The owner/operator shall:
A. Determine the hours of operation with a supervisor monitoring and maintenance of an
operations log B. Record the hours of operation daily
C. Use the hours of operation to calculate a new rolling 12-month total by the 20th day of each month using data from the previous 12 months D. Keep the hours of operation records for all periods when the plant is in operation. [R307-401-8] II.B.1.d NEW The owner/operators shall limit operations to the following number of units at one time: A. Two (2) screens; B. One (1) fines screen; and C. Four (4) crushers. [R307-401-8]

II.B.1.d.1 Records of plant configuration shall be kept on a weekly basis for all periods when the plant is in operation. [R307-401-8]

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 11
II.B.1.e NEW The owner operator shall not allow visible emissions from the following emission points to exceed the following values: A. All crushers - 15% opacity B. All screens - 10% opacity C. All conveyor transfer points - 10% opacity D. All diesel engines - 20% opacity E. All natural gas engines - 10% opacity F. All conveyor drop points - 20% opacity
G. The truck-mix concrete batch plant and associated equipment - 10% opacity
H. All other fugitive dust emissions - 20% opacity. [40 CFR 60 Subpart OOO, R307-205, R307-401-8]

II.B.1.e.1 NEW Opacity observations of emissions from stationary sources shall be conducted according to 40 CFR 60, Appendix A, Method 9. [R307-401-8]
II.B.2 Roads and Fugitive Dust II.B.2.a The owner/operator shall not allow visible fugitive dust emissions from haul-road traffic, mobile equipment, and all other sources in operational areas to exceed 20% opacity on site.
[R307-401-8] II.B.2.a.1 Visible emission determinations for fugitive dust from haul roads and operational areas shall use procedures similar to Method 9. The normal requirement for observations to be made at
15-second intervals over a six-minute period, however, shall not apply. 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.b NEW The owner/operator shall use water application and chemical suppressant on all haul roads and operational areas used by mobile equipment to maintain opacity limits listed in this AO. The owner/operator may stop applying water to the haul roads and operational areas when the temperature is below freezing. [R307-401-8]
II.B.2.c The owner/operator shall apply water to all storage piles on site to control fugitive emissions. Sprays shall operate as required to maintain the opacity limits listed in this AO when the temperature is above freezing. Records of water treatment shall be kept for all periods when the plant is in operation. [R307-401-8]

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 12
II.B.2.c.1 NEW Records of water and chemical suppressant application on all haul roads and operational areas used by mobile equipment shall be kept for all periods when the plant is in operation. The records shall include the following items:
A. Date and time treatments were made B. Number of treatments made and quantity of water applied C. Rainfall amount received, if any D. Records of temperature, if the temperature is below freezing. [R307-401-8]

II.B.2.d The owner/operator shall not exceed 3 acres of total area of storage piles on site. [R307-401-8]
II.B.3 Aggregate Processing Equipment
II.B.3.a The owner/operator shall install water sprays on all crushers, all screens, all conveyor transfer points, and all conveyor drop points on site to control emissions. Sprays shall operate as required to maintain the opacity limits listed in this AO when the temperature is above
freezing. [40 CFR 60 Subpart OOO, R307-401-8] II.B.3.b The owner/operator shall perform monthly periodic inspections to check that water is flowing to discharge spray nozzles associated with each crusher, screen, and conveyor. If the owner/operator finds that water is not flowing properly during an inspection of the water spray nozzles, the owner/operator shall initiate corrective action within 24 hours and complete corrective action as expediently as practical. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.3.b.1 NEW Records of the water sprays inspections shall be kept and maintained in a logbook for all periods when the plant is in operation. The records shall include the following items: A. Date the inspections were made
B. Any corrective actions taken
C. Control mechanism used if sprays are not operating.
[40 CFR 60 Subpart OOO, R307-401-8]
II.B.3.c The owner/operator shall conduct an initial performance test for all crushers, screens, and
conveyor transfer points listed as new in this AO and subject to 40 CFR 60 Subpart OOO within 60 days after achieving the maximum production rate but not later than 180 days after initial startup. Performance tests shall meet the limitations specified in Table 3 to Subpart
OOO. Records of initial performance tests shall be kept and maintained with the equipment for the life of the equipment. [40 CFR 60 Subpart OOO]
II.B.3.c.1 Initial performance tests for fugitive emissions limits shall be conducted according to 40 CFR
60.675(c). The owner/operator may use methods and procedures specified in 40 CFR 60.675(e) as alternatives to the reference methods and procedures specified in 40 CFR 60.675(c). [ 40 CFR 60 Subpart OOO]

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 13
II.B.3.d The owner/operator shall submit written reports to the Director of the results of all performance tests conducted to demonstrate compliance with the standards set forth in 40 CFR 60.672. [40 CFR 60 Subpart OOO]

II.B.4 NEW The owner/operator shall comply with the following requirements when generator engines are supplying power to the Concrete Batch Plant. II.B.4.a NEW The owner/operator shall not operate the facility, except the concrete batch plant, before 6:00 am or after 6:00 pm. [R307-401-8]

II.B.4.b NEW The owner/operator shall not operate the concrete batch plant before 4:00 am or after 6:00 pm or for more than 10 hours per day during the months of June through August. [R307-401-8] II.B.4.c NEW The owner/operator shall not operate the concrete batch plant before 8:00 am or after 4:00 pm or for more than 8 hours per day during the months of December through February. [R307-401-8] II.B.4.d NEW The owner/operator shall not operate the concrete batch plant before 6:00 am or after 5:00 pm or for more than 9 hours per day during the months of March through May and September
through November. [R307-401-8] II.B.4.e NEW The owner/operator shall not operate the 400 kW Generator Engine and the 455 kW Generator Engine at the same time. [R307-401-8]

II.B.4.f NEW The 150 kW natural gas generator engine and the 200 kw diesel fueled generator engine shall not operate at the same time. [R307-401-8] II.B.4.f.1 NEW The owner/operator shall: A. Determine the hours of operation with supervisor monitoring and maintenance of an operations log
B. Record the start and end times, and the hours of operation on a daily basis for the concrete batch plant and all other equipment on site C. Keep the records for all periods when the plant is in operation. [R307-401-8, R307-410-4] II.B.5 NEW The owner/operator shall comply with the following requirements when line power supplies the electrical power to the Concrete Batch Plant.
II.B.5.a NEW The owner/operator shall not operate the concrete batch plant before 4:00 am or after 10:00 pm or for more than 10 hours per day during the months of June through August. [R307-401-8]

II.B.5.b NEW The owner/operator shall not operate the facility, except the concrete batch plant, before 6:00 am or after 10:00 pm. [R307-401-8]

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 14
II.B.5.c NEW The owner/operator shall not operate the concrete batch plant before 6:00 am or after 10:00 pm or for more than 10 hours per day during the months of September through June. [R307-401-8]

II.B.5.d NEW The 150 kW natural gas generator engine and the 200 kW diesel fueled generator engine shall not operate during times when line power is used for the concrete batch plant. [R307-401-8] II.B.5.d.1 NEW The owner/operator shall: A. Determine the hours of operation with supervisor monitoring and maintenance of an operations log B. Record the start and end times, and the hours of operation on a daily basis for the concrete batch plant and all other equipment on site
C. Keep the records for all periods when the plant is in operation.
[R307-401-8, R307-410-4]
II.B.6 NEW Truck-Mix Concrete Batch Plant
II.B.6.a
NEW
The owner/operator shall not produce more than 224,640 cubic yards of concrete per rolling
12-month period. [R307-401-8] II.B.6.a.1 NEW The owner/operator shall: A. Determine production in hours of operation with each generator engine B. Record production on a daily basis
C. Use each production data to calculate a new rolling 12-month total by the 20th day of each month using data from the previous 12 months D. Keep the production records for all periods the plant is in operation. [R307-401-8]

II.B.6.b NEW The owner/operator shall install and operate a baghouse to control particulate emissions from each of the cement and fly ash silos during filling of the silos and truck loading operations. [R307-401-8]

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 15
II.B.7 NEW Generator Engines
II.B.7.a NEW The owner/operator shall install a 150 kW (226 hp) generator engine that is certified to meet the following emission standards: A. NOx - 1.0 g/hp-hr B. CO - 2.0 g/hp-hr C. VOC - 0.7 g/hp-hr. [40 CFR 60 Subpart JJJJ, R307-401-8]
II.B.7.a.1 NEW The owner/operator shall keep a record of the manufacturer's certification of the emission rate. The record shall be kept for the life of the equipment. [R307-401-8]
II.B.7.b The owner/operator shall only combust diesel fuel that meets the definition of ultra-low sulfur diesel (ULSD), which has a sulfur content of 15 ppm or less. [R307-401-8]
II.B.7.c 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.7.d NEW The 400 kW (536 hp) generator engine shall be subject to the following emission standard in 40 CFR 63 Subpart ZZZZ:
A. Limit CO concentrations to 23 ppmvd or reduce CO emissions by 70 percent or more. [40 CFR 63 Subpart ZZZZ, R307-401-8] II.B.7.d.1 NEW Initial performance tests shall be conducted as per 40 CFR 63.6612. Subsequent performance tests shall be conducted every 8,760 hours or 3 years, whichever comes first, as per Table 3 of 40 CFR 63 Subpart ZZZZ. Additional requirements in 40 CFR 63 Subpart ZZZZ may apply to this engine. [40 CFR 63 Subpart ZZZZ, R307-401-8]
II.B.7.e The 455 kW (610 hp) generator engine shall meet all applicable requirements in 40 CFR 60
Subpart IIII and shall be certified to meet the following emission standards: 0.01 g/kW-hr of PM, 3.5 g/kW-hr of NOx, 3.5 g/kW-hr of CO, and 0.4 g/kW-hr of NMHC. [40 CFR 60 Subpart IIII, R307-401-8]

II.B.7.e.1 NEW To demonstrate compliance with the above conditions, the owner/operator shall either:
A. Purchase a manufacturer certified Tier IV engine, or
B. Conduct an initial performance test to demonstrate exhaust emission standards
according to 40 CFR 1039.240. [40 CFR 60 Subpart IIII, R307-401-8]

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 16
II.B.7.e.2 The owner/operator shall maintain records of engine certification or the initial performance test. [40 CFR 60 Subpart IIII, R307-401-8]
II.B.7.f NEW The 200 kW (268 hp) and the 183 kW (245 hp) diesel engines shall be subject to the following requirements in 40 CFR 63 Subpart ZZZZ: A. Change oil and filter every 1,000 hours of operation or annually, whichever comes first; B. Inspect air cleaner every 1,000 hours of operation or annually, whichever comes first, and replace as necessary; C. Inspect all hoses and belts every 500 hours of operation or annually, whichever comes
first, and replace as necessary.
Additional requirements in 40 CFR 63 Subpart ZZZZ may apply to this engine. [40 CFR 63 Subpart ZZZZ, R307-401-8]

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 17
PERMIT HISTORY When issued, the approval order shall supersede (if a modification) or will be based on the
following documents: Supersedes DAQE-AN120660005-22 dated May 12, 2022
Is Derived From NOI dated November 16, 2022 Incorporates Additional information dated May 2, 2023 Incorporates Additional information dated November 16, 2023 Incorporates Additional information dated December 21, 2023 Incorporates Additional information dated January 25, 2024 Incorporates Additional information dated April 4, 2024 Incorporates Additional information dated April 24, 2024 Incorporates Modeling Report Issued dated June 4, 2024
REVIEWER COMMENTS 1. Comment regarding Emission Estimates: Natural Gas Generator Engine The emissions from the generator engine were calculated with AP-42 Chapter 3.2 and the manufacturers emission factors for NOx, CO, and VOC. [Last updated August 4, 2023]
2. Comment regarding NSPS/MACT Applicability: 40 CFR 60 (NSPS)
40 CFR Part 60 Subpart OOO applies to select equipment at nonmetallic mineral processing plants that commenced construction, modification, or reconstruction after August 31, 1983. The screens, crushers, and transfer/drop points (conveyors, stackers, feed bins) at this facility are subject to 40
CFR Part 60 Subpart OOO. 40 CFR 60 Subpart IIII applies to owner and operators of CI ICE that commence construction after 04/01/2006 or are reconstructed or modified after 07/11/2005. The 455 kW engines commenced construction after the 2006 date. NSPS Subpart IIII will apply to this plant. 40 CFR 60 Subpart JJJJ applies to owners and operators of the ICE that commence construction or are reconstructed after June 12, 2006. The 150 kW engine commenced construction after the 2006 date. NSPS Subpart JJJJ will apply to this plant. 40 CFR 63 (MACT) 40 CFR 63 Subpart ZZZZ applies to owners and operators of stationary RICE at a major or area source of HAP emissions. Since this source will have a stationary RICE at an area source of HAP
emissions, MACT Subpart ZZZZ will apply to this plant. [Last updated December 19, 2023] 3. Comment regarding Title V Applicability: Title V of the 1990 Clean Air Act (Title V) applies to the following: 1. Any major source 2. Any source subject to a standard, limitation, or other requirement under Section 111 of the Act, Standards of Performance for New Stationary Sources;
3. Any source subject to a standard or other requirement under Section 112 of the Act, Hazardous Air Pollutants. 4. Any Title IV affected source.

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 18
This facility is not a major source and is not a Title IV source. The facility is subject to 40 CFR 60 (NSPS) and 40 CFR 63 (MACT) regulations. The facility is not subject to 40 CFR 61 (NESHAP)
regulations. Title V applies to this facility as an area source. There is no requirement for this source to apply for a Title V operating permit under current UDAQ and EPA rules. The source will be charged applicable Title V fees and Title V funds may be used for inventory and compliance inspections of this source. [Last updated August 4, 2023]

Engineer Review N120660006: Hawley Rock Products - Crushing and Screening Operation September 17, 2024 Page 19
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
10/1/24
Equipment Details
Rating 201 hp = (150 kw)
Operational Hours 3,744 hours/yearEngine Type
Criteria Pollutant
Emission
Standards
(g/hp-hr)
Emission Factor
(lb/MMBtu)
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)Reference
NOX 1.0 0.44 0.83
CO 2.0 0.89 1.66
PM10 9.99E-03 0.01 0.03PM2.5 9.99E-03 0.01 0.03
VOC 0.7 0.31 0.58SO25.88E-04 0.00 0.00
HAP 0.10 0.19 See Below
Green House Gas Pollutant
Global
Warming
Potential
Emission Factor
(lb/MMBtu)
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)ReferenceCO2 (mass basis)1 1.10E+02 155 290
Methane (mass basis)25 1.25E+00 2 3CO2e372
Hazardous Air Pollutant
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)Reference
1,1,2,2-Tetrachloroethane 4.00E-05 5.63E-05 1.05E-041,1,2-Trichloroethane 3.18E-05 4.47E-05 8.38E-051,3-Butadiene 2.67E-04 3.76E-04 7.03E-041,3-Dichloropropene 2.64E-05 3.71E-05 6.95E-052,2,4-Trimethylpentane 2.50E-04 3.52E-04 6.58E-042-Methylnaphthalene 3.32E-05 4.67E-05 8.74E-05Acenaphthene1.25E-06 1.76E-06 3.29E-06Acenaphthylene5.53E-06 7.78E-06 1.46E-05Acetaldehyde8.36E-03 1.18E-02 2.20E-02Acrolein5.14E-03 7.23E-03 1.35E-02
Benzene 4.40E-04 6.19E-04 1.16E-03
Benzo(b)fluoranthene 1.66E-07 2.34E-07 4.37E-07Benzo(e)pyrene 4.15E-07 5.84E-07 1.09E-06benzo(g,h,i)perylene 4.14E-07 5.82E-07 1.09E-06
Biphenyl 2.12E-04 2.98E-04 5.58E-04Carbon Tetrachloride 3.67E-05 5.16E-05 9.67E-05Chlorobenzene3.04E-05 4.28E-05 8.01E-05Chloroform2.85E-05 4.01E-05 7.51E-05
Chrysene 6.93E-07 9.75E-07 1.83E-06Ethylbenzene3.97E-05 5.59E-05 1.05E-04Ethylene Dibromide 4.43E-05 6.23E-05 1.17E-04
Fluoranthene 1.11E-06 1.56E-06 2.92E-06Fluorene5.67E-06 7.98E-06 1.49E-05Formaldehyde5.28E-02 7.43E-02 1.39E-01
Methanol 2.50E-03 3.52E-03 6.58E-03Methylene Chloride 2.00E-05 2.81E-05 5.27E-05n-Hexane 1.11E-03 1.56E-03 2.92E-03Naphthalene7.44E-05 1.05E-04 1.96E-04PAH2.69E-05 3.78E-05 7.09E-05
Phenanthrene 1.04E-05 1.46E-05 2.74E-05
Phenol 2.40E-05 3.38E-05 6.32E-05Pyrene1.36E-06 1.91E-06 3.58E-06Styrene2.36E-05 3.32E-05 6.22E-05
Tetrachloroethane 2.48E-06 3.49E-06 6.53E-06Toluene4.08E-04 5.74E-04 1.07E-03Vinyl Chloride 1.49E-05 2.10E-05 3.92E-05Xylene1.84E-04 2.59E-04 4.85E-04
Manufacturer Data,
AP-42 Table 3.2-1,Table 3.2-2, &
Table 3.2-3
AP-42 Table 3.2-1,
Table 3.2-2, &
Table 3.2-3
Emission Factor
(lb/MMBtu)
AP-42 Table 3.2-1,Table 3.2-2, &
Table 3.2-3
(Some HAP do not popluate based on
the type of engine selected. AP-42 does not list certain
HAP for certain types
of engines.)
Natural Gas-Fired Engines
Emergency Engines should equal 100 hours of
operation per year4-Stroke Lean-Burn
Page 1 of Version 1.1 February 21, 2019

DAQE-MN120660006-24

M E M O R A N D U M

TO: Tim DeJulis, NSR Engineer

FROM: Dave Prey, Air Quality Modeler

DATE: February 29, 2024

SUBJECT: Modeling Analysis Review for the Notice of Intent for Hawley Rock Products,
Inc. – Elsinore Pit, Sevier County, Utah
__________________________________________________________________________________________________
This is not a Major Prevention of Significant Deterioration (PSD) Source.

I. OBJECTIVE
Hawley Rock Products, Inc. (Applicant) is seeking a modified approval order for their Elsinore Pit
located in Sevier County, Utah. Operations at the pit include aggregate mining, crushing, screening,
and hauling. Diesel generator engines provide power to the onsite equipment. Annual aggregate
production is limited to 875,000 tons. Hawley has requested a modification to DAQE-
AN120660005-22 to add a 226 hp natural gas fueled generator engine to the site.

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 would be in compliance with 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

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

: 3 *
DP
DP
DAQE-MN120660006-24
Page 2
III. MODELING METHODOLOGY

A. Applicability

Emissions from the facility include PM10, NOx, CO, SO2, and HAPs. The emission rates for PM10
and NOx warranted the requirement to model under R307-401-8. Modeling was performed by
the UDAQ.

B. Assumptions

1. Topography/Terrain

The Plant is at an elevation 5314 feet with terrain features that have an affect on
concentration predictions.

a. Zone: 12

b. Approximate Location:

UTM (NAD83): 398991 meters East
4280305 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 – Milford Airport, UT NWS: 2016-2020
Upper Air – Las Vegas, NV NWS: 2016-2020

DAQE-MN120660006-24
Page 3
6. Background

The background concentrations were based on concentrations measured in Enoch and Cedar
City, Utah.

7. Receptor and Terrain Elevations

The modeling domain used 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.

9. Air Pollutant Emission Rates

Source
UTM Coordinates Modeled Emission Rates
Easting Northing PM10
(m) (m) (lb/hr) (tons/yr) hrs/year
SCREENC 398991 4280305 0.5200 1.139 4380
SCREENF 398999 4280305 0.7700 1.686 4380
CRUSHERS 399015 4280301 0.9200 2.015 4380
CONVEYOR 398981 4280279 0.2100 0.460 4380
TLOADUNLD 398877 4280263 0.0500 0.110 4380
STOCKPILE 398877 4280181 0.0400 0.088 4380
HAULAGG 398843 4280086 1.2300 2.694 4380
CBPFUG 398881 4280059 0.7000 1.150 3285
HAULCON 398845 4280086 0.8000 1.752 4380
GEN_455 398997 4280289 0.4300 0.942 4380
GEN_200 398878 4280300 0.5900 1.292 4380
GEN400 399024 4280288 1.1800 2.584 4380
GEN_NG 398931 4280067 0.0100 0.016 3285
GENCRUSH 398955 4280204 0.7200 1.577 4380

Total 8.17 17.50
DAQE-MN120660006-24
Page 4
Source
UTM Coordinates Modeled Emission Rates
Easting Northing Nox
(m) (m) (lb/hr) (tons/yr) hrs/year
GEN_455 398997 4280289 14.64 18.30 2500
GEN_200 398878 4280300 8.31 2.49 600
GEN400 399024 4280288 16.62 20.78 2500
GEN_NG 398931 4280067 5.74 10.75 3744
GENCRUSH 398955 4280204 10.17 1.02 200
Total 45.31 52.31 10. Source Location and Parameters

Source Type
Source Parameters
Elev
, Ht Te
mp Flo
w Di
a Sigm
a-Y Sigm
a-Z X-
Dim Y-
Dim Area
(ft) (
m
) (ft) (K) (m/
s) (m
) (m) (m) (m) (m) (m^2)
SCREENC VOLUME
5314
.7
3.
0
10.
0 0.00 1.52
SCREENF VOLUME
5314
.3
3.
0
10.
0 0.00 1.52
CRUSHER
S VOLUME
5313
.6
3.
0
10.
0 0.00 1.52
CONVEY
OR AREA
5315
.6
3.
0
10.
0 0.00 1.52 58.8
3 43.4
8 2557.
9
TLOADU
NLD AREA
5319
.8
3.
0
10.
0 0.00 1.52 46.6 38.4
3 1790.
8
STOCKPI
LE AREA
5329
.3
3.
0
10.
0 0.00 132.
19 213.
54 2822
7.9
HAULAG
G LINE_VOL
UME
5346
.7
4.
3
13.
9 11.00 8.50
CBPFUG AREA
5345
.7
3.
0
10.
0 0.00 1.52 24.7
8 18.1
4 449.5
HAULCO
N LINE_VOL
UME
5346
.7
4.
3
13.
9 10.00 8.50
GEN_455 POINT
5314
.9
4.
3
14.
0 683
54.
28
0.0
8 0.00
GEN_200 POINT
5318
.6
3.
0
10.
0 683
54.
28
0.0
8 0.00
GEN400 POINT
5313
.3
4.
3
14.
0 683
54.
28
0.0
2 0.00
GEN_NG POINT
5344
.2
3.
0
10.
0 683
54.
28
0.0
8 0.00
DAQE-MN120660006-24
Page 5
GENCRUS
H POINT
5314
.9
3.
0
10.
0 683
54.
28
0.0
8 0.00

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.

Pollutant Period Prediction Others Background Total NAAQS Percent
(μg/m3) (μg/m3) (μg/m3) (μg/m3) (μg/m3) NAAQS
PM10 24-Hour 58.21 1.24 46 105.5 150 70.3%

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 143.6 7.5 36.2 8.1 187.96 188 99.98%

V. PERMIT CONDITIONS

The following suggested permit language should be included under the Terms and Conditions in the
AO:

• With the exception of the concrete batch plant (CPB), the facility shall be permitted to
operate between the hours of 6 am and 6 pm.
• The CPB shall be allowed to operate for 10 hours between the hours of 4 am and 6 pm
during the months of June, July, and August.
• The CPB shall be allowed to operate for 8 hours between the hours of 8 am and 4 pm
during the winter months of the year (December through February).
• The CPB shall be allowed to operate for 9 hours between the hours of 6 am and 5 pm
during the remaining months of the year (March thru May and September through
November).
• The 400 kw and 455 kw generators shall not operate at the same time.

DP:jg

DAQE-MN120660006A-24

M E M O R A N D U M

TO: Tim DeJulis, NSR Engineer

FROM: Dave Prey, Air Quality Modeler

DATE: May 2, 2024

SUBJECT: Modeling Analysis Review for the Notice of Intent for Hawley Rock Products,
Inc. – Elsinore Pit, Sevier County, Utah
_____________________________________________________________________________________
This is not a Major Prevention of Significant Deterioration (PSD) Source.

I. OBJECTIVE
Hawley Rock Products, Inc. (Applicant) is seeking a modified approval order for their Elsinore Pit
located in Sevier County, Utah. Operations at the pit include aggregate mining, crushing, screening,
and hauling. Diesel generator engines provide power to the onsite equipment. Annual aggregate
production is limited to 875,000 tons. Hawley has requested a modification to DAQE-
AN120660005-22 to add a 226 hp natural gas fueled generator engine to the site.

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 would be in compliance with 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

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

: 3 *
DP
DP
DAQE-MN120660006A-24
Page 2
III. MODELING METHODOLOGY

A. Applicability

Emissions from the facility include PM10, NOx, CO, SO2, and HAPs. The emission rates for PM10
and NOx warranted the requirement to model under R307-401-8. Modeling was performed by
the UDAQ.
B. Assumptions

1. Topography/Terrain

The Plant is at an elevation 5314 feet with terrain features that have an affect on
concentration predictions.

a. Zone: 12

b. Approximate Location:

UTM (NAD83): 398991 meters East
4280305 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 – Milford Airport, UT NWS: 2016-2020
Upper Air – Las Vegas, NV NWS: 2016-2020

DAQE-MN120660006A-24
Page 3
6. Background

The background concentrations were based on concentrations measured in Enoch and Cedar
City, Utah.

7. Receptor and Terrain Elevations

The modeling domain used 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.

9. Air Pollutant Emission Rates

There are two scenarios modeled to account for the eventual removal of the new natural gas
generator in replacement with line power. The scenario using line power retains the
original permit hours of operation conditions from the previous AO. The scenario with the
new natural gas generator requires additional restrictions on the hours of operation so the
model can show compliance with the 1-hour NO2 NAAQS.

Source
UTM Coordinates Modeled Emission Rates
Easting Northing PM10
(m) (m) (lb/hr) (tons/yr) hrs/year
SCREENC 398991 4280305 0.5200 1.139 4380
SCREENF 398999 4280305 0.7700 1.686 4380
CRUSHERS 399015 4280301 0.9200 2.015 4380
CONVEYOR 398981 4280279 0.2100 0.460 4380
TLOADUNLD 398877 4280263 0.0500 0.110 4380
STOCKPILE 398877 4280181 0.0400 0.088 4380
HAULAGG 398843 4280086 1.2300 2.694 4380
CBPFUG 398881 4280059 0.7000 1.150 3285
HAULCON 398845 4280086 0.8000 1.752 4380
GEN_455 398997 4280289 0.4300 0.942 4380
GEN_200 398878 4280300 0.5900 1.292 4380
DAQE-MN120660006A-24
Page 4
GEN400 399024 4280288 1.1800 2.584 4380
GEN_NG 398931 4280067 0.0100 0.016 3285
GENCRUSH 398955 4280204 0.7200 1.577 4380

Total 8.17 17.50
Scenario 1 – NEW generator used, no line power

Source
UTM Coordinates Modeled Emission Rates
Easting Northing Nox
(m) (m) (lb/hr) (tons/yr) hrs/year
GEN_455 398971 4280304 14.64 26.72 3650
GEN_200 398879 4280062 8.31 0.00 0
GEN400 398813 4280189 16.62 0.00 0
GEN_NG 398879 4280061 5.74 9.43 3285
GEN245 398804 4280190 10.17 18.56 3650
Total 45.31 36.15

Scenario 2 – CPB line power used

Source
UTM Coordinates Modeled Emission Rates
Easting Northing Nox
(m) (m) (lb/hr) (tons/yr) hrs/year
GEN_455 398971 4280304 14.64 26.72 3650
GEN_200 398879 4280062 8.31 0.00 0
GEN400 398813 4280189 16.62 0.00 0
GEN_NG 398879 4280061 5.74 0.00 0
GEN245 398804 4280190 10.17 18.56 3650
Total 45.31 26.72

DAQE-MN120660006A-24
Page 5

Hales Sand and Gravel NOx

Source
UTM Coordinates Modeled Emission Rates
Easting Northing Nox
(m) (m) (lb/hr) (tons/yr) hrs/year
H_GEN 399788 4280048 1.79 7.82 8760

10. Source Location and Parameters

Source Type
Source Parameters
Elev, Ht Temp Flow Dia
(ft) (m) (ft) (K) (m/s) (m)
GEN_455 POINT 5315.5 4.3 14.0 683 54.28 0.08
GEN_200 POINT 5345.7 3.0 10.0 683 54.28 0.08
GEN400 POINT 5346.4 4.3 14.0 683 54.28 0.02
GEN_NG POINT 5345.7 3.0 10.0 683 54.28 0.08
GEN245 POINT 5346.4 3.0 10.0 683 54.28 0.08
Source Type
Source Parameters
Elev, Ht Temp Flow Dia
(ft) (m) (ft) (K) (m/s) (m)
H_GEN POINT 5334.3 3.0 10.0 683 54.28 0.08

Source Type Source
Parameter
s

Elev, Ht Tem
p Flow Dia Sigma
-Y Sigma
-Z X-Dim Y-Dim Area
(ft) (m) (ft) (K) (m/s) (m) (m) (m) (m) (m) (m^2)
SCREENC VOLUME 5314.7 3.0 10.
0
0.00 1.52 6.99 1
SCREENF VOLUME 5314.3 3.0 10.
0
0.00 1.52 7.39 1
CRUSHERS VOLUME 5313.6 3.0 10.
0
0.00 1.52 8.95 1
CONVEYOR AREA 5315.6 3.0 10.
0
0.00 1.52 58.83 43.48 2557.9
3
DAQE-MN120660006A-24
Page 6
TLOADUNL
D AREA 5319.8 3.0 10.
0
0.00 1.52 46.6 38.43 1790.8
4
STOCKPILE AREA 5329.3 3.0 10.
0
0.00 132.1
9 213.5
4 28227.
9
HAULAGG LINE_VOLUM
E 5346.7 4.3 13.
9
11.00 8.50 1
CBPFUG AREA 5345.7 3.0 10.
0
0.00 1.52 24.78 18.14 449.50
9
HAULCON LINE_VOLUM
E 5346.7 4.3 13.
9
10.00 8.50 1
GEN_CUMM POINT 5344.2 3.0 10.
0
683 54.2
8
0.0
8
0.00 1
GEN_CAT POINT 5318.6 3.0 10.
0
683 54.2
8
0.0
8
0.00 1

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.

Pollutant Period Prediction Others Background Total NAAQS Percent
(μg/m3) (μg/m3) (μg/m3) (μg/m3) (μg/m3) NAAQS
PM10 24-Hour 58.21 1.24 46 105.5 150 70.3%

Scenario 1 – NEW generator used, no line power

Air
Polluta
nt
Perio
d
Predictio
n
Class II
Significa
nt
Impact
Level
Backgroun
d
Nearby
Sources
*
Total NAAQ
S
Percen
t
(μg/m3) (μg/m3) (μg/m3) (μg/m3) (μg/m3
)
(μg/m3) NAAQ
S
NO2
1-
Hour 130.0 7.5 48.4 0.0 178.3
7 188 94.88%

Scenario 2 – CPB line power used

DAQE-MN120660006A-24
Page 7
Air
Polluta
nt
Perio
d
Predictio
n
Class II
Significa
nt
Impact
Level
Backgroun
d
Nearby
Sources
*
Total NAAQ
S
Percen
t
(μg/m3) (μg/m3) (μg/m3) (μg/m3) (μg/m3
)
(μg/m3) NAAQ
S
NO2
1-
Hour 39.2 7.5 126.3 0.0 165.5
0 188 88.03%

V. PERMIT CONDITIONS

The following suggested permit language should be included under the Terms and Conditions in the
AO:

Scenario 1 – NEW generator used, no line power

• With the exception of the concrete batch plant (CPB), the facility shall be permitted to
operate between the hours of 6 am and 6 pm.
• The CPB shall be allowed to operate for 10 hours between the hours of 4 am and 6 pm
during the months of June, July, and August.
• The CPB shall be allowed to operate for 8 hours between the hours of 8 am and 4 pm
during the winter months of the year (December through February).
• The CPB shall be allowed to operate for 9 hours between the hours of 6 am and 5 pm
during the remaining months of the year (March thru May and September through
November).
• The 400 kw and 455 kw generators shall not operate at the same time.
• The new natural gas and 200 kw generators shall not operate at the same time

Scenario 2 – CPB line power used

• With the exception of the concrete batch plant (CPB), the facility shall be permitted to
operate between the hours of 6 am and 10 pm.
• The CPB shall be allowed to operate for 10 hours between the hours of 4 am and 10 pm
during the months of June, July, and August.
• The CPB shall be allowed to operate for 10 hours between the hours of 6 am and 10 pm
during the remaining months of the year (September through June).
• The new natural gas and 200 kw generators shall not operate during times when line
power is used for the CPB.

DP:jg

APPROVAL ORDER - DAQE-AN120660005-22
II.A THE APPROVED EQUIPMENT
II.B.1.d The owner/operator shall not operate the generator engines on site for more than the
following limits:
A. 200 hours per rolling 12-month period for the 245-hp engine (II.A.2)
B. 2,500 hours per rolling 12-month period for the 400-kW generator engine (II.A.26)
C. 600 hours per rolling 12-month period for the 200-kW generator engine (II.A.27)
D. 2,500 hours per rolling 12-month period for the 455-kW generator engine (II.A.28).

II.A THE APPROVED EQUIPMENT Current Use
II.A.2 Pioneer Roll Crusher - 54 x 24 Rating: 154 TPH Manufacture Date:
1951 Associated Engine Rated Capacity: 245 hp Manufacture Date:
prior to 1973 MACT 40 CFR 63 Subpart ZZZZ Equipment
Currently Not in Use
II.A.26 Diesel Generator Rating: 400 kW (536 hp) Manufacture Date: 1976
MACT 40 CFR 63 Subpart ZZZZ Equipment
Currently Not in Use
II.A.27 Diesel Generator Rating: 200 kW (268 hp) Manufacture Date: 1977
MACT 40 CFR 63 Subpart ZZZZ Equipment
Currently being used to run the batch plant. The use of this
generator will be replaced by the new generator being added
to the permit.
II.A.28 Diesel Generator Rating: 455 kW (610 hp) Manufacture Date: 2015
MACT 40 CFR 63 Subpart ZZZZ Equipment NSPS 40 CFR 60
Subpart IIII Equipment
Currently being used to run the crusher, with a 12-Month
rolling average run time of 1200 hours, or 5 hours per day 5
days a week. The exact time during the day falls within the
time frame specified in the AO.

W 1400 S
N
1
2
0
0

W
1:5000
Concrete Batch Plant Area
Site Entrance
W 1400 S
Office
Gravel Pit
Hawley Rock Products, Inc.
Site Map
Figure
1
Approx. Generator Location
W 1400 S
N
1
2
0
0

W
1:5000
Concrete Batch Plant Area
Site Entrance
W 1400 S
Gravel Pit
Hawley Rock Products, Inc.
Site Map
Figure
1
II.A.27/New Generator
II.A.2 and II.A.26
II.A.28
1/25/24, 9:56 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r8133803001938…1/10
Tim Dejulis <[e-mail]>
Hawley Rock's NOI
21 messages
Tim Dejulis <[e-mail]>Tue, Feb 28, 2023 at 2:06 PM
To: "[e-mail]" <[e-mail]>
Cc: Alan Humpherys <[e-mail]>
Randa,
My name is Timothy DeJulis and I have been assigned to go through the Notice-of-Intent (NOI) offered to us from Hawley
Rock . I have comments on the NOI.
The generator engine uses AP-42 emission factors. The generator engine will operate for 3,744 hrs 12-month period. The
Generac engine provided has no emission information, which is why I presume Hawley Rock's (Hawley) went with AP-42.
There is a Maximum Available Control Technology (MACT) standard that applies to the diesel fueled generator engine,
found in 40 CFR 63.
In MACT Subpart ZZZZ, there is a CO emission limit of 230 ppmv or less for a diesel fueled generator engine at 226 hp.
We need the emission information to confirm that this generator engine is at or below this value. Could we have the new
generator engine emission information supplied to us please? I can explain this further if you would like. Thank you.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
Bryant Bunnell <[e-mail]>Wed, Mar 15, 2023 at 10:49 AM
To: Tim Dejulis <[e-mail]>
Hi Tim,

I hope you are doing well. Judging by how many projects you are over right now I’m sure you’re busy. The Hawley’s
reached out to me and asked if I can help getting you the information you need. In the future, go ahead and copy me on
any correspondence regarding this permitting action.

You mention MACT requirements regarding a diesel engine. They are attempting to permit a generator that runs on
natural gas. Let me know if you are still needing emissions information considering it being a natural gas unit.

Thanks,
Bryant Bunnell

1/25/24, 9:56 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r8133803001938…2/10
[Quoted text hidden]
Tim Dejulis <[e-mail]>Tue, Mar 21, 2023 at 9:54 AM
To: Bryant Bunnell <[e-mail]>
Bryant,
I apologize for making the mistake of having this generator engine fueled by diesel instead of natural gas. I don't need any
more information from Hawley Rock to make progress on their NOI. I will be sending Hawley Rock's engineering review to
the peer reviewer this week. Again, I'm sorry for the error on Hawley Rock's project.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
[Quoted text hidden]
Bryant Bunnell <[e-mail]>Tue, Mar 21, 2023 at 10:08 AM
To: Tim Dejulis <[e-mail]>
No problem Tim, I know you guys have a lot on your plate right now. I do have a queson regarding an
applicaon I sent for TSJ construcon. Have you been able to look at those forms? Let me know if you have
any quesons. It's my first me helping with a mobile permit applicaon so I might need help making sure
you have all the info you need.
Thanks,
Bryant Bunnell
From: Tim Dejulis <[e-mail]>
Sent: Tuesday, March 21, 2023 9:54 AM
To: Bryant Bunnell <[e-mail]>
Subject: Re: Hawley Rock's NOI

[Quoted text hidden]
Tim Dejulis <[e-mail]>Thu, Apr 20, 2023 at 12:21 PM
To: Bryant Bunnell <[e-mail]>, [e-mail]
Bryant,
My peer wants to see the emission factors for the brand new generator engine in order to sign off on the engineering
review. The specification sheet offered in the NOI doesn't have any emission factors included. Could we have the
emission factors for NOx, CO, and VOC for the natural gas generator engine? Thank you.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
1/25/24, 9:56 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r8133803001938…3/10
airquality.utah.gov
[Quoted text hidden]
Bryant Bunnell <[e-mail]>Tue, May 2, 2023 at 12:28 PM
To: Tim Dejulis <[e-mail]>, "[e-mail]" <[e-mail]>
Hi Tim,

I have heard back from the manufacturer and I’ve attached the emissions specs for this generator they provided. I’ve
highlighted the data for the engine family that this generator is associated. At first glance it looks like the manufacturers
emissions factors are much less conservative than that found in the AP-42 compilation. Let me know if you have any more
questions. I hope we can get this project off your plate soon.

Thanks,
Bryant

From: Tim Dejulis <[e-mail]>
Sent: Thursday, April 20, 2023 12:21 PM
To: Bryant Bunnell <[e-mail]>; [e-mail]
Subject: Re: Hawley Rock's NOI

Bryant,

My peer wants to see the emission factors for the brand new generator engine in order to sign off on the engineering
review. The specification sheet offered in the NOI doesn't have any emission factors included. Could we have the
emission factors for NOx, CO, and VOC for the natural gas generator engine? Thank you.

Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov

[Quoted text hidden]
1/25/24, 9:56 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r8133803001938…4/10
0K7426.pdf
1882K
Tim Dejulis <[e-mail]>Thu, May 4, 2023 at 10:13 AM
To: Bryant Bunnell <[e-mail]>
Cc: "[e-mail]" <[e-mail]>
Bryant,
I will advise other sources using a NG fired generator engine that they can find a unit with as low an emission value as
this! Thank you for supplying this to us!
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
[Quoted text hidden]
Tim Dejulis <[e-mail]>Thu, Aug 24, 2023 at 3:22 PM
To: Bryant Bunnell <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Enqiang He <[e-mail]>
Bryant,
My peer and I have questions about the emissions factors for the new generator engine and the BACT analysis.
Could we get a revised emission estimate calculation for the engine operation, showing the reduced emission factors for
NOx, CO, and VOC, included in the Generac spec sheet? The emission estimate calculations submitted use AP-42
generator emissions factors, which are very large compared to what the DAQ expects. Also, there needs to be a BACT
discussion included in the NOI. It is referenced as section V in the title of the NOI, but is not included in the paperwork.
If there are any questions, let me know.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
[Quoted text hidden]
Tim Dejulis <[e-mail]>Tue, Sep 26, 2023 at 12:38 PM
To: Bryant Bunnell <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Enqiang He <[e-mail]>, Alan Humpherys
<[e-mail]>
Bryant,
1/25/24, 9:56 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r8133803001938…5/10
We are waiting for a calculation regarding the lower emitting NG generator engine and a discussion in the BACT analysis
section of the NOI. Is there anything I can do to help with this? Please let me know soon.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
[Quoted text hidden]
Tim Dejulis <[e-mail]>Wed, Nov 8, 2023 at 12:39 PM
To: Bryant Bunnell <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Enqiang He <[e-mail]>, Alan Humpherys
<[e-mail]>
Bryant,
It's been nearly two months since my last correspondence with Hawley Rock, with no response at all. Be advised that if
we don't get a response in the next few days, the DAQ will consider cancelling the pending NOI. How can we help to get
this issue I raised three months ago resolved? Please advise.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
[Quoted text hidden]
JOHN <[e-mail]>Wed, Nov 8, 2023 at 12:57 PM
To: Tim Dejulis <[e-mail]>
I'm reaching out to Mr. Bunnell. Thank you!
From: Tim Dejulis <[e-mail]>
Sent: Wednesday, November 8, 2023 12:39 PM
To: Bryant Bunnell <[e-mail]>
Cc: [e-mail] <[e-mail]>; Enqiang He <[e-mail]>; Alan Humpherys
<[e-mail]>
[Quoted text hidden]

[Quoted text hidden]
Bryant Bunnell <[e-mail]>Wed, Nov 8, 2023 at 1:06 PM
To: Tim Dejulis <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Enqiang He <[e-mail]>, Alan Humpherys
<[e-mail]>
1/25/24, 9:56 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r8133803001938…6/10
Hi Tim,
I'm not sure why your emails aren't popping up in my primary inbox. I'll try and figure out what's going on. I
can see your requests in the thread below and I'll jump on this right away. Unl I figure out this email issue,
please include this addional email address to any correspondence moving forward:
[e-mail].
Thanks,
Bryant
From: Tim Dejulis <[e-mail]>
Sent: Wednesday, November 8, 2023 12:39 PM
To: Bryant Bunnell <[e-mail]>
Cc: [e-mail] <[e-mail]>; Enqiang He <[e-mail]>; Alan Humpherys
<[e-mail]>
[Quoted text hidden]

[Quoted text hidden]
Bryant Bunnell <[e-mail]>Thu, Nov 16, 2023 at 12:18 PM
To: Tim Dejulis <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Enqiang He <[e-mail]>, Alan Humpherys
<[e-mail]>
Tim,
Secon V of the NOI, that was sent to Mr. Humpherys on 11/30/2022, did include a BACT analysis discussion. It’s at
the boom of page 1. If this needs to be modified or if you have quesons let me know.
Find below, the revised esmated emissions specific to the new generator, that reflect the emissions factors given in
the spec sheet for NOx, CO, and VOCs. If you’d like me to send a formal response that includes the other porons of
the NOI please let me know. Contact me with any quesons.
Thanks,
Bryant
Emissions Results – Natural Gas Generator
Analyte Emission Factor
(Grams/bhp-hr.)
Emission Factor
(lbs./hp-hr.) hr./yr. bhp Emissions
(lbs./hr.)
Emissions
(tons/yr.)
NOX 3.00E-02 6.61E-05
3744 226
0.01 0.03
CO 2.00E-02 4.41E-05 0.01 0.02
VOCs* 1.00E-01 2.20E-04 0.05 0.09
*The THC factor given in the manufacturer’s published emissions data accounts for VOC emissions.
Source: Manufacturer’s Specificaons provided in the previous submial.
Emissions Results-Natural Gas Generator
Analyte Emission Factor
(lbs./MMBtu)
Emission
Factor
(lbs./hp-
hr.)
Engine Rated Output
(MMBtu/hr.) hr./yr. bhp Emissions
(lb./hr.)
Emissions
(tons/yr.)
CO2 1.10E+02 7.86E-01 1.61466 3744 226 177.61 332.5
SO2 5.88E-04 4.20E-06 0.001 0.002
TOC 3.58E-01 2.56E-03 0.58 1.1
Methane 2.30E-01 1.64E-03 0.37 0.7
1/25/24, 9:56 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r8133803001938…7/10
PM10 9.50E-03 6.79E-05 0.02 0.03
PM2.5 9.50E-03 6.79E-05 0.02 0.03
PM 9.91E-03 7.08E-05 0.02 0.03
Source: AP-42, Vol. I, 3:2, Table 3.2-3
From: Tim Dejulis <[e-mail]>
Sent: Wednesday, November 8, 2023 12:39 PM
To: Bryant Bunnell <[e-mail]>
Cc: [e-mail] <[e-mail]>; Enqiang He <[e-mail]>; Alan Humpherys
<[e-mail]>
[Quoted text hidden]

[Quoted text hidden]
Tim Dejulis <[e-mail]>Thu, Nov 16, 2023 at 1:50 PM
To: Bryant Bunnell <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Enqiang He <[e-mail]>, Alan Humpherys
<[e-mail]>
Bryant,
We can use this information in furtherance of creating Hawley's engineering review (ER). Thank you for providing this to
us. I will add this information to Hawley's ER and send it back to the peer reviewer for his signature. Emissions from the
generator engine was the only issue he had, so after he signs this, it will go to modeling and compliance for their review.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
[Quoted text hidden]
Tim Dejulis <[e-mail]>Fri, Dec 22, 2023 at 10:58 AM
To: Bryant Bunnell <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Alan Humpherys <[e-mail]>, Dave Prey
<[e-mail]>
Bryant,
Our modeling staff has a request for the information, that would have been included on form 11, to be submitted by
Hawley Rock Products. No modeling for NOx was done during the last project and we want to do the modeling of NOx at
this point in time. If you have any questions please let me know. Thank you.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
1/25/24, 9:56 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r8133803001938…8/10
[Quoted text hidden]
Bryant Bunnell <[e-mail]>Fri, Dec 22, 2023 at 12:06 PM
To: Tim Dejulis <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Alan Humpherys <[e-mail]>, Dave Prey
<[e-mail]>
Tim,
I le you a voicemail. You need me to submit form 11?
From: Tim Dejulis <[e-mail]>
Sent: Friday, December 22, 2023 10:58 AM
To: Bryant Bunnell <[e-mail]>
Cc: [e-mail] <[e-mail]>; Alan Humpherys <[e-mail]>; Dave Prey
<[e-mail]>
[Quoted text hidden]

[Quoted text hidden]
Tim Dejulis <[e-mail]>Thu, Jan 25, 2024 at 10:12 AM
To: Bryant Bunnell <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Alan Humpherys <[e-mail]>
Bryant,
An issue has been raised regarding the emissions of NOx, CO, and VOCs. On the Generac data sheet it says that "No
emission values provided are to be construed as guarantees of emissions levels for any given Generac generator
unit." In this same document it references the EPA certificate though. We have the emission values offered by you,
representing the generator engine submitted on November 16, 2023 (see above). These emission values are the same as
what's on the Generac data sheet.
Do you have the certificate from the EPA that certifies the emissions from this natural gas generator engine that could be
shared with us? If we can't have the EPA certification in the record, we will have to include regular stack testing of the
generator engine in the permit for Hawley Rock. We need this information to make any progress on this project.
Please advise.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
[Quoted text hidden]
Bryant Bunnell <[e-mail]>Thu, Jan 25, 2024 at 10:27 AM
To: Tim Dejulis <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Alan Humpherys <[e-mail]>
I will have to contact Generac again and maybe even the EPA to see if I can find what you need. I'll call you here
shortly, I have a few addional quesons.
Thanks,
1/25/24, 9:56 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r8133803001938…9/10
Bryant
From: Tim Dejulis <[e-mail]>
Sent: Thursday, January 25, 2024 10:12 AM
To: Bryant Bunnell <[e-mail]>
Cc: [e-mail] <[e-mail]>; Alan Humpherys <[e-mail]>
[Quoted text hidden]

[Quoted text hidden]
Bryant Bunnell <[e-mail]>Thu, Jan 25, 2024 at 12:44 PM
To: Tim Dejulis <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Alan Humpherys <[e-mail]>
Tim,
I've aached EPA's cerficate associated with the emissions spec sheet from generac. I'm working on geng the
informaon for your modeling staff. I'll send that over shortly.
From: Tim Dejulis <[e-mail]>
Sent: Thursday, January 25, 2024 10:12 AM
To: Bryant Bunnell <[e-mail]>
Cc: [e-mail] <[e-mail]>; Alan Humpherys <[e-mail]>
[Quoted text hidden]

[Quoted text hidden]
EGNXB08.92C3_055.pdf
132K
Tim Dejulis <[e-mail]>Thu, Jan 25, 2024 at 12:58 PM
To: Bryant Bunnell <[e-mail]>
Thank you!
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
[Quoted text hidden]
Bryant Bunnell <[e-mail]>Thu, Jan 25, 2024 at 7:24 PM
To: Tim Dejulis <[e-mail]>, JOHN <[e-mail]>
Hi Tim,
1. Here are the stack specs:
1/25/24, 9:56 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r813380300193…10/10
Exhaust Specs Inches SCFM
Max Height 55.6 -
Diameter 3.0 -
Flow -1208.8
2. I've aached the approximate locaon of the generator on the property.
3. The third item you requested for modeling is the emission rates for all other equipment on site. Do you need
emission rates for just NOx, CO, and VOCs? If not, what connuants do you need rates for?
If I'm missing anything, please let me know.
Thanks,
Bryant
From: Tim Dejulis <[e-mail]>
Sent: Thursday, January 25, 2024 12:58 PM
To: Bryant Bunnell <[e-mail]>
[Quoted text hidden]

[Quoted text hidden]
Generator Location.JPG
177K
Equipment Details
Rating 226 hp = (168.7 kw)
Operational Hours 3,744 hours/yearEngine Type
Criteria Pollutant
Emission
Standards
(g/hp-hr)
Emission Factor
(lb/MMBtu)
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)Reference
NOX 1.0 0.50 0.93
CO 2.0 1.00 1.87
PM10 9.99E-03 0.02 0.03PM2.5 9.99E-03 0.02 0.03
VOC 0.7 0.35 0.65SO25.88E-04 0.00 0.00
HAP 0.11 0.21 See Below
Green House Gas Pollutant
Global
Warming
Potential
Emission Factor
(lb/MMBtu)
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)ReferenceCO2 (mass basis)1 1.10E+02 174 326
Methane (mass basis)25 1.25E+00 2 4CO2e418
Hazardous Air Pollutant
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)Reference
1,1,2,2-Tetrachloroethane 4.00E-05 6.33E-05 1.18E-041,1,2-Trichloroethane 3.18E-05 5.03E-05 9.42E-051,3-Butadiene 2.67E-04 4.22E-04 7.91E-041,3-Dichloropropene 2.64E-05 4.18E-05 7.82E-052,2,4-Trimethylpentane 2.50E-04 3.96E-04 7.40E-042-Methylnaphthalene 3.32E-05 5.25E-05 9.83E-05Acenaphthene1.25E-06 1.98E-06 3.70E-06Acenaphthylene5.53E-06 8.75E-06 1.64E-05Acetaldehyde8.36E-03 1.32E-02 2.48E-02Acrolein5.14E-03 8.13E-03 1.52E-02
Benzene 4.40E-04 6.96E-04 1.30E-03
Benzo(b)fluoranthene 1.66E-07 2.63E-07 4.92E-07Benzo(e)pyrene 4.15E-07 6.57E-07 1.23E-06benzo(g,h,i)perylene 4.14E-07 6.55E-07 1.23E-06
Biphenyl 2.12E-04 3.35E-04 6.28E-04Carbon Tetrachloride 3.67E-05 5.81E-05 1.09E-04Chlorobenzene3.04E-05 4.81E-05 9.00E-05Chloroform2.85E-05 4.51E-05 8.44E-05
Chrysene 6.93E-07 1.10E-06 2.05E-06Ethylbenzene3.97E-05 6.28E-05 1.18E-04Ethylene Dibromide 4.43E-05 7.01E-05 1.31E-04
Fluoranthene 1.11E-06 1.76E-06 3.29E-06Fluorene5.67E-06 8.97E-06 1.68E-05Formaldehyde5.28E-02 8.35E-02 1.56E-01
Methanol 2.50E-03 3.96E-03 7.40E-03Methylene Chloride 2.00E-05 3.16E-05 5.92E-05n-Hexane 1.11E-03 1.76E-03 3.29E-03Naphthalene7.44E-05 1.18E-04 2.20E-04PAH2.69E-05 4.26E-05 7.97E-05
Phenanthrene 1.04E-05 1.65E-05 3.08E-05
Phenol 2.40E-05 3.80E-05 7.11E-05Pyrene1.36E-06 2.15E-06 4.03E-06Styrene2.36E-05 3.73E-05 6.99E-05
Tetrachloroethane 2.48E-06 3.92E-06 7.34E-06Toluene4.08E-04 6.45E-04 1.21E-03Vinyl Chloride 1.49E-05 2.36E-05 4.41E-05Xylene1.84E-04 2.91E-04 5.45E-04
Manufacturer Data,
AP-42 Table 3.2-1,Table 3.2-2, &
Table 3.2-3
AP-42 Table 3.2-1,
Table 3.2-2, &
Table 3.2-3
Emission Factor
(lb/MMBtu)
AP-42 Table 3.2-1,Table 3.2-2, &
Table 3.2-3
(Some HAP do not popluate based on
the type of engine selected. AP-42 does not list certain
HAP for certain types
of engines.)
Natural Gas-Fired Engines
Emergency Engines should equal 100 hours of
operation per year4-Stroke Lean-Burn
Page 1 of Version 1.1 February 21, 2019

[e-mail]
[phone]

November 16, 2022

Bryce C. Bird
Utah Division of Air Quality
195 North 1950 West
Salt Lake City, UT 84114-4820
Attention: New Source Review Section

Re: Notice of Intent for Hawley Rock Products, Inc.

Dear Mr. Bird,

Attached to this letter is a Notice of Intent (NOI) for Hawley Rock Products, Inc. with an
existing Utah DAQ air permit (AN120660005-22) in Sevier County at UTM coordinates 399710
m East 4280510 m North (NAD27, Zone 12). The purpose for this NOI is to add a natural gas
generator to the current permit.

Thank you for taking the time to review this material. If you have any questions or need
additional information, please feel free to contact Bryant Bunnell at 801-436-4596.

Regards,

Bryant Bunnell
Environmental Engineer

Hawley Rock Products, Inc. – NOI 2022
Contents:
I. Introduction II. Generator Description III. Emissions Calculations IV. Federal/State Requirement Applicability V. BACT Analysis
Figure 1 Site Map Appendix 1 Emissions Calculations and Results
Appendix 2 UDAQ Forms Appendix 3 Generator - Manufacturer’s Specifications
Hawley Rock Products, Inc. – NOI 2022
Cove Engineering & Environmental Services, LLC Notice of Intent Page | 1
I. Introduction
Hawley Rock Products, Inc. is submitting this Notice of Intent (NOI) to the New Minor Source Review group for approval to operate a new natural gas generator in Sevier County at UTM coordinates 399710 m East 4280510 m North (NAD27, Zone 12).
II. Generator Description
This new equipment is a 2014 Generac 150kW-180kVA natural gas generator and will provide power to the concrete batch plant operation. For information regarding its location See Figure 1. Also, see Appendix 3 for the manufacturer’s specifications. III. Emissions Calculations Emissions from the generator were estimated using the method listed in AP-42, Vol 1, 3:2 (Natural Gas-fired Reciprocating Engines). The emission factors listed in Table 3.2-3 were converted using the
equation listed under note b: lb/hp-hr = (lb/MMBtu)(heat input, MMBtu/hr)(1/operating HP, 1/HP).
Using the manufacturers specifications and information given in note b of Table 3.2-3 the heat input factor was calculated as follows:
heat input, MMBtu/hr = (fuel heat content, MMBtu/scf)(rated fuel input, scf/hr). The calculations and results for the emissions estimates are included in Appendix 1. IV. Federal/State Requirement Applicability The federal and state rules, regulations and guidelines that apply to this operation are listed below.
The Clean Air Act
National Ambient Air Quality Standards
Utah Administrative Code, subset R307
The Utah State Implementation Plan (SIP)
New Source Performance Standards (NSPS: 40 CFR 60)
Specifically:
- 40 CFR 60 Subpart OOO: Standards of Performance for Nonmetallic
Mineral Processing - 40 CFR 63 Subpart ZZZZ: National Emissions Standards for Hazardous Air Pollutants for Stationary Reciprocating Internal Combustion Engines

V. BACT Analysis Capital investment toward additional controls for this generator would be excessive considering the size and output of the batch plan operation. Therefore, the control technologies are considered BACT.
Hawley Rock Products, Inc. – NOI 2022
Cove Engineering & Environmental Services, LLC Notice of Intent Page | 2

Figures

W 1400 S
N
1
2
0
0

W
1:5000
Concrete Batch Plant Area
Site Entrance
W 1400 S
Office
Gravel Pit
Hawley Rock Products, Inc.
Site Map
Figure
1
Hawley Rock Products, Inc. – NOI 2022
Cove Engineering & Environmental Services, LLC Notice of Intent Page | 3

Appendix 1

Emissions Calculations & Results

Emissions Results – Natural Gas Generator
Analyte Emissions Factor
(lbs/MMBtu)
Emissions Factor
(lbs/hp-hr)
Engine Rated Output
(MMBtu/hr) hrs/yr bhp Emissions
(lbs/hr)
Emissions
(tons/yr)
NOX 2.21E+00 1.58E-02
1.61466 3744 226
3.57 6.7
CO 3.51E+00 2.51E-02 5.67 10.6
CO2 1.10E+02 7.86E-01 177.61 332.5
SO2 5.88E-04 4.20E-06 0.001 0.002
TOC 3.58E-01 2.56E-03 0.58 1.1
Methane 2.30E-01 1.64E-03 0.37 0.7
VOC 2.96E-02 2.11E-04 0.05 0.1
PM10 9.50E-03 6.79E-05 0.02 0.03
PM2.5 9.50E-03 6.79E-05 0.02 0.03
PM 9.91E-03 7.08E-05 0.02 0.03

Notes:
1. Source: AP-42, Vol. I, 3:2, Table 3.2-3/Manufacturer’s Specifications

Emissions Results (TOCs) – Natural Gas Generator
Analyte (TOCS) Emission Factor (lbs/MMBtu) Emission Factor
(lbs/hp-hr) Engine Rated Output (MMBtu/hr) hr/yr bhp Emissions
(lbs/hr)
Emissions
(tons/yr)
1,1,2,2-Tetrachloroethane 2.53E-05 1.81E-07
1.61466 3744 226
4.09E-05 7.65E-05
1,1,2-Trichloroethane 1.53E-05 1.09E-07 2.47E-05 4.62E-05
1,1-Dichloroethane 1.13E-05 8.07E-08 1.82E-05 3.42E-05
1,2-Dichloroethane 1.13E-05 8.07E-08 1.82E-05 3.42E-05
1,2-Dichloropropane 1.30E-05 9.29E-08 2.10E-05 3.93E-05
1,3-Butadiene 6.63E-04 4.74E-06 1.07E-03 2.00E-03
1,3-Dichloropropene 1.27E-05 9.07E-08 2.05E-05 3.84E-05
Acetaldehyde 2.79E-03 1.99E-05 4.50E-03 8.43E-03
Acrolein 2.63E-03 1.88E-05 4.25E-03 7.95E-03
Benzene 1.58E-03 1.13E-05 2.55E-03 4.78E-03
Butyr/isobutyraldehyde 4.86E-05 3.47E-07 7.85E-05 1.47E-04
Carbon Tetrachloride 1.77E-05 1.26E-07 2.86E-05 5.35E-05
Chlorobenzene 1.29E-05 9.22E-08 2.08E-05 3.90E-05
Chloroform 1.37E-05 9.79E-08 2.21E-05 4.14E-05
Ethane 7.04E-02 5.03E-04 1.14E-01 2.13E-01
Ethylbenzene 2.48E-05 1.77E-07 4.00E-05 7.50E-05
Ethylene Dibromide 2.13E-05 1.52E-07 3.44E-05 6.44E-05
Formaldehyde 2.05E-02 1.46E-04 3.31E-02 6.20E-02
Methanol 3.06E-03 2.19E-05 4.94E-03 9.25E-03
Methylene Chloride 4.12E-05 2.94E-07 6.65E-05 1.25E-04
Naphthalene 9.71E-05 6.94E-07 1.57E-04 2.93E-04
PAH 1.41E-04 1.01E-06 2.28E-04 4.26E-04
Styrene 1.19E-05 8.50E-08 1.92E-05 3.60E-05
Toluene 5.58E-04 3.99E-06 9.01E-04 1.69E-03
Vinyl Chloride 7.18E-06 5.13E-08 1.16E-05 2.17E-05
Xylene 1.95E-04 1.39E-06 3.15E-04 5.89E-04
Notes:
1. Source: AP-42, Vol. I, 3:2, Table 3.2-3/Manufacturers Specifications
PTE Totals
Criteria Pollutants/GH Gases PTE Current
(TPY)
PTE Change
(TPY)
PTE Total
(TPY)
CO2 Equivalent 4550 333.19 4883.19
Carbon Monoxide 9.56 10.61 20.17
Nitrogen Oxides 28.41 6.68 35.09
Particulate Matter - PM10 8.56 0.03 8.59
Particulate Matter - PM2.5 3.17 0.03 3.20
Sulfur Dioxide 1.85 0.002 1.85
Volatile Organic Compounds 2.45 0.09 2.54

Hazardous Air Pollutants PTE Current
(lbs/yr)
Change
(lbs/yr)
PTE Total
(lbs/yr)
Total HAPs (CAS #THAPS) 120 0.31 120.31
PTE Current
(TPY)
Change
(TPY)
PTE Total
(TPY)
Total HAPs 0.06 1.56E-04 0.06

Hawley Rock Products, Inc. – NOI 2022
Cove Engineering & Environmental Services, LLC Notice of Intent Page | 4

Appendix 2

UDAQ FORMS

Form 1 Date __________________
Notice of Intent (NOI) Application Checklist
Company __________________
Utah Division of Air Quality
New Source Review Section
Source Identification Information [R307-401-5]
1. Company name, mailing address, physical address and telephone number 
2. Company contact (Name, mailing address, and telephone number)
3.Name and contact of person submitting NOI application (if different than 2) 4.Source Universal Transverse Mercator (UTM) coordinates 
5. Source Standard Industrial Classification (SIC) code 
6.Area designation (attainment, maintenance, or nonattainment)
7.Federal/State requirement applicability (NAAQS, NSPS, MACT, SIP, etc.)
8.Source size determination (Major, Minor, PSD) 9. Current Approval Order(s) and/or Title V Permit numbers 
NOI Application Information: [R307-401]










N/A 
N/A 
A.Air quality analysis (air model, met data, background data, source impact analysis) N/A 
1.Detailed description of the project and source process
2.Discussion of fuels, raw materials, and products consumed/produced3.Description of equipment used in the process and operating schedule
4.Description of changes to the process, production rates, etc.
5.Site plan of source with building dimensions, stack parameters, etc.
6.Best Available Control Technology (BACT) Analysis [R307-401-8]A.BACT analysis for all new and modified equipment
7.Emissions Related Information: [R307-401-2(b)]
A.Emission calculations for each new/modified unit and site-wide
(Include PM10, PM2.5, NOx, SO2, CO, VOCs, HAPs, and GHGs)B.References/assumptions, SDS, for each calculation and pollutant
C.All speciated HAP emissions (list in lbs/hr)
8.Emissions Impact Analysis – Approved Modeling Protocol [R307-410]
A.Composition and physical characteristics of effluent(emission rates, temperature, volume, pollutant types and concentrations)
9.Nonattainment/Maintenance Areas – Major NSR/Minor (offsetting only) [R307-403]
A.NAAQS demonstration, Lowest Achievable Emission Rate, Offset requirements
B.Alternative site analysis, Major source ownership compliance certification
10.Major Sources in Attainment or Unclassified Areas (PSD) [R307-405, R307-406]
B.Visibility impact analysis, Class I area impact
11.Signature on Application
N/A 
Note: The Division of Air Quality will not accept documents containing confidential information or data.
Documents containing confidential information will be returned to the Source submitting the application.
Page 1 of 1
Form 4 Company____________________________
Project Information Site ______________________________

Utah Division of Air Quality
New Source Review Section
Process Data - For Modification/Amendment ONLY
1. Permit Number_______________________________
If submitting a new permit, then use Form 3
Requested Changes
2. Name of process to be modified/added:
_______________________________

End product of this process:

_______________________________

3. Permit Change Type: New Increase*
Equipment
Process

Condition Change ____________________
Other ______________________________
Other ______________________________

Other ______________________________

4. Does new emission unit affect existing
permitted process limits?

Yes No
5. Condition(s) Changing:

6. Description of Permit/Process Change**

7. New or modified materials and quantities used in process. **
Material Quantity Annually

8. New or modified process emitting units **
Emitting Unit(s) Capacity(s) Manufacture Date(s)

*If the permit being modified does not include CO2e or PM2.5, the emissions need to be calculated and submitted to DAQ, which may result in an
emissions increase and a public comment period.
**If additional space is required, please generate a document to accommodate and attach to form.

Page 1 of 1
Company___________________________
Site _____________________________
Form 5
Emissions Information
Criteria/GHGs/ HAP’s
Utah Division of Air Quality
New Source Review Section
Potential to Emit* Criteria Pollutants & GHGs
Criteria Pollutants Permitted Emissions
(tons/yr)
Emissions Increases
(tons/yr)
Proposed Emissions
(tons/yr)
PM10 Total
PM10 Fugitive
PM2.5
NOx
SO2
CO
VOC
VOC Fugitive
NH3
Greenhouse Gases CO2e CO2e CO2e
CO2
CH4
N2O
HFCs
PFCs
SF6
Total CO2e
*Potential to emit to include pollution control equipment as defined by R307-401-2.
Hazardous Air Pollutants** (**Defined in Section 112(b) of the Clean Air Act )
Hazardous Air
Pollutant***
Permitted Emissions
(tons/yr)
Emission Increase
(tons/yr)
Proposed
Emission (tons/yr)
Emission Increase
(lbs/hr)
Total HAP
*** Use additional sheets for pollutants if needed
**See NOI For Emissions Information**
Hawley Rock Products, Inc. – NOI 2022
Cove Engineering & Environmental Services, LLC Notice of Intent Page | 5

Appendix 3

Generator - Manufacturere’s Specifications

MG150 | 9.0L | 150 kW
INDUSTRIAL SPARK-IGNITED GENERATOR SET
EPA Certified Stationary Emergency and Non-Emergency
SP
E
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S
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1 of 6
DEMAND RESPONSE READY
Standby Power Rating
150 kW, 188 kVA, 60 Hz

*EPA Certified Prime ratings are not available in the US or its Territories

Codes and Standards
Not all codes and standards apply to all configurations. Contact
factory for details.
UL2200, UL508, UL489
CSA C22.2
BS5514 and DIN 6271
SAE J1349
NFPA 37, 70, 99, 110
NEC700, 701, 702, 708
ISO 3046, 7637, 8528, 9001
NEMA ICS10, MG1, 250, ICS6, AB1
ANSI C62.41
IBC 2009, CBC 2010, IBC 2012,
ASCE 7-05, ASCE 7-10, ICC-ES AC-
156 (2012)
TM
®
®
Powering Ahead
Generac ensures superior quality by designing and
manufacturing most of its generator components, such
as alternators, enclosures, control systems and
communications software. Generac also makes its own
spark-ignited engines, and you’ll find them on every
Generac gaseous-fueled generator. We engineer and
manufacture them from the block up — all at our
facilities throughout Wisconsin. Applying natural gas
and LP-fueled engines to generators requires advanced
engineering expertise to ensure reliability, durability and
necessary performance. By designing specifically for
these dry, hotter-burning fuels, the engines last longer
and require less maintenance. Building our own
engines also means we control every step of the supply
chain and delivery process, so you benefit from single-
source responsibility.
Plus, Generac Industrial Power’s distribution network
provides all parts and service so you don’t have to deal
with third-party suppliers. It all leads to a positive
owner experience and higher confidence level. Generac
spark-ignited engines give you more options in
commercial and industrial generator applications as
well as extended run time from utility-supplied natural
gas.
*Assembled in the USA using domestic and foreign parts
Image used for illustration purposes only

MG150 | 9.0L | 150 kW
INDUSTRIAL SPARK-IGNITED GENERATOR SET
EPA Certified Stationary Emergency and Non-Emergency
SP
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2 of 6
DEMAND RESPONSE READY
CONTROL SYSTEM
Digital G Paralleling Control Panel-
Touchscreen
Program Functions
•Programmable Crank Limiter
•7-Day Programmable Exerciser
•Special Applications Programmable Logic Controller
•RS-232/485 Communications
•All Phase Sensing Digital Voltage Regulator
•2-Wire Start Capability
•Date/Time Fault History (Event Log)
•Isochronous Governor Control
•Waterproof/Sealed Connectors
•Audible Alarms and Shutdowns
•Not in Auto (Flashing Light)
•Auto/Off/Manual Switch
•E-Stop (Red Mushroom-Type)
•NFPA 110 Level I and II (Programmable)
•Customizable Alarms, Warnings, and Events
•Modbus® Protocol
•Predictive Maintenance Algorithm
•Sealed Boards
•Password Parameter Adjustment Protection
•Single Point Ground
•16 Channel Remote Trending
•0.2 Msec High Speed Remote Trending
•Alarm Information Automatically Annunciated
on the Display
Full System Status Display
•Power Output (kW)
•Power Factor
•kW Hours, Total, and Last Run
•Real/Reactive/Apparent Power
•All Phase AC Voltage
•All Phase Currents
•Oil Pressure
•Coolant Temperature
•Coolant Level
•Engine Speed
•Battery Voltage
•Frequency
Alarms and Warnings
•Oil Pressure
•Coolant Temperature
•Coolant Level
•Low Fuel Pressure
•Engine Overspeed
•Battery Voltage
•Alarms and Warnings Time and Date Stamped
•Snap Shots of Key Operation Parameters During
Alarms and Warnings
•Alarms and Warnings Spelled Out (No Alarm Codes)
ENGINE SYSTEM
•Oil Drain Extension
•Air Cleaner
•Fan Guard
•Stainless Steel Flexible Exhaust Connection
•Factory Filled Oil and Coolant
•Radiator Duct Adapter (Open Set Only)
•Critical Silencer/Catalyst
Fuel System
•NPT Fuel Connection on Frame
•Primary and Secondary Fuel Shutoff
Cooling System
•Closed Coolant Recovery System
•UV/Ozone Resistant Hoses
•Factory-Installed Radiator
•50/50 Ethylene Glycol Antifreeze
•Radiator Drain Extension
Electrical System
•Battery Charging Alternator
•Battery Cables
•Battery Tray
•Rubber-Booted Engine Electrical Connections
•Solenoid Activated Starter Motor
ALTERNATOR SYSTEM
•Main Line Circuit Breaker
•UL2200 GENprotect™
•Class H Insulation Material
•2/3 Pitch
•Skewed Stator
•Permanent Magnet Excitation
•Sealed Bearings
•Amortisseur Winding
•Full Load Capacity Alternator
GENERATOR SET
•Internal Genset Vibration Isolation
•Separation of Circuits - High/Low Voltage
•Separation of Circuits - Multiple Breakers
•Wrapped Exhaust Piping
•Standard Factory Testing
•2 Year Limited Warranty (Standby Rated Units)
•Silencer Mounted in the Discharge Hood
(Enclosed Units Only)•Ready to Accept Full Load in <10 Seconds
ENCLOSURE (If Selected)
•Rust-Proof Fasteners with Nylon Washers to
Protect Finish•High Performance Sound-Absorbing Material
(Sound Attenuated Enclosures)•Gasketed Doors
•Stamped Air-Intake Louvers
•Upward Facing Discharge Hood (Radiator
and Exhaust)•Stainless Steel Lift Off Door Hinges
•Stainless Steel Lockable Handles
•RhinoCoat™ - Textured Polyester Powder Coat
PARALLELING CONTROLS
•Auto-Synchronization Process
•Isochronous Load Sharing
•Reverse Power Protection
•Maximum Power Protection
•Electrically Operated, Mechanically Held
Paralleling Switch•Sync Check System
•Independent On-Board Paralleling
•Optional Programmable Logic Full Auto Back-Up
Controls (PLS)•Shunt Trip and Auxiliary Contact
STANDARD FEATURES

MG150 | 9.0L | 150 kW
INDUSTRIAL SPARK-IGNITED GENERATOR SET
EPA Certified Stationary Emergency and Non-Emergency
SP
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S
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DEMAND RESPONSE READYCONFIGURABLE OPTIONS
ENGINE SYSTEM
○Engine Block Heater
○Oil Heater
○Air Filter Restriction Indicator
○Radiator Stone Guard (Open Set Only)
○Baseframe Cover/Rodent Guard
○Level 1 Fan and Belt Guards (Enclosed Units Only)
○Shipped Loose Critical Silencer (Open Set Only)
FUEL SYSTEM
○NPT Flexible Fuel Line
ELECTRICAL SYSTEM
○10A UL Listed Battery Charger
○Battery Warmer
ALTERNATOR SYSTEM
○Alternator Upsizing
○Anti-Condensation Heater
○Tropical Coating
CIRCUIT BREAKER OPTIONS
○2nd Main Line Circuit Breaker
○Shunt Trip and Auxiliary Contact
○Electronic Trip Breakers
GENERATOR SET
○Demand Response Rating
○Extended Factory Testing (3-Phase Only)
○IBC Seismic Certification
○12 Position Load Center
WEATHER PROTECTED ENCLOSURE
○Weather Protected Enclosure
○Level 1 Sound Attenuated
○Level 2 Sound Attenuated
○Level 2 Sound Attenuated with Motorized Dampers
○Steel Enclosure
○Aluminum Enclosure
○Up to 200 MPH Wind Load Rating (Contact Factory
for Availability)
○AC/DC Enclosure Lighting Kit
○Enclosure Heaters
○Door Open Alarm Switch
CONTROL SYSTEM
○NFPA 110 Compliant Level 1 21-Light Remote
Annunciator
○Remote Relay Assembly (8 or 16)
○Remote E-Stop (Break Glass-Type, Surface Mount)
○Remote E-Stop (Red Mushroom-Type,
Surface Mount)
○Remote E-Stop (Red Mushroom-Type, Flush Mount)
○10A Engine Run Relay
○Ground Fault Annunciator
○100 dB Alarm Horn
○Damper Alarm Contacts (Motorized Dampers Only)
○120V GFCI and 240V Outlets
○Auxiliary Circuit Breaker Contacts to Controller
WARRANTY (Standby Gensets Only)
○2 Year Extended Limited Warranty
○5 Year Limited Warranty
○5 Year Extended Limited Warranty
○7 Year Extended Limited Warranty
○10 Year Extended Limited Warranty
ENGINEERED OPTIONS
ENGINE SYSTEM
○Fluid Containment Pans
CONTROL SYSTEM
○Battery Disconnect Switch
ALTERNATOR SYSTEM
○3rd Breaker System
GENERATOR SET
○Special Testing
○Battery Box

MG150 | 9.0L | 150 kW
INDUSTRIAL SPARK-IGNITED GENERATOR SET
EPA Certified Stationary Emergency and Non-Emergency
SP
E
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S
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4 of 6
DEMAND RESPONSE READY
* G18 refers to all engines manufactured before August 3rd, 2018. G26 refers to all
engines manufactured after August 3rd, 2018.
General
Make Generac
Cylinder # 8
Type V
Displacement - in3 (L) 543 (8.9)
Bore - in (mm) 4.49 (114.3)
Stroke - in (mm) 4.25 (107.95)
Compression Ratio G18 - 10.5:1 * G26 - 9.1:1 *
Intake Air Method Naturally Aspirated and Turbocharged
Number of Main Bearings 5
Connecting Rods Forged Steel
Cylinder Head Cast Iron
Cylinder Liners No
Ignition High Energy
Piston Type Aluminum Alloy
Crankshaft Type Forged Steel
Lifter Type Hydraulic Roller
Intake Valve Material Steel Alloy
Exhaust Valve Material Stainless Steel
Hardened Valve Seats Yes
Engine Governing
Governor Electronic
Frequency Regulation (Steady State) ±0.25%
Lubrication System
Oil Pump Type Gear
Oil Filter Type Full-Flow Spin-On Cartridge
Crankcase Capacity - qt (L) G18 - 8.5 (8.0) * G26 - 10.0 (9.5) *
Cooling System
Cooling System Type Pressurized Closed
Fan Type Pusher
Fan Speed - RPM 2,386
Fan Diameter - in (mm) 22 (558.8)
Fuel System
Fuel Type Natural Gas, Propane Vapor/Liquid
Carburetor Down Draft
Secondary Fuel Regulator Standard
Fuel Shut Off Solenoid Standard
Operating Fuel Pressure NG/LPV - in H2O (kPa) 7 - 11 (1.7 - 2.7)
Optional Operating Fuel Pressure LPL
- psi (kPa)30 - 312 (206 - 2,151)
Engine Electrical System
System Voltage 12 VDC
Battery Charger Alternator Standard
Battery Size See Battery Index 0161970SBY
Battery Voltage 12 VDC
Ground Polarity Negative
APPLICATION AND ENGINEERING DATA
ENGINE SPECIFICATIONS

ALTERNATOR SPECIFICATIONS
Standard Model K0150124Y26
Poles 4
Field Type Revolving
Insulation Class - Rotor H
Insulation Class - Stator H
Total Harmonic Distortion <5%
Telephone Interference Factor (TIF) <50
Standard Excitation Permanent Magnet
Bearings Single Sealed Ball
Coupling Direct via Flexible Disc
Prototype Short Circuit Test Yes
Voltage Regulator Type Full Digital
Number of Sensed Phases All
Regulation Accuracy (Steady State) ±0.25%

MG150 | 9.0L | 150 kW
INDUSTRIAL SPARK-IGNITED GENERATOR SET
EPA Certified Stationary Emergency and Non-Emergency
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** Refer to “Emissions Data Sheet” for maximum bHP for EPA and SCAQMD permitting purposes.
Deration – Operational characteristics consider maximum ambient conditions. Derate factors may apply under atypical site conditions.
Please contact a Generac Power Systems Industrial Dealer for additional details. All performance ratings in accordance with ISO3046, BS5514, ISO8528, and DIN6271 standards.
Standby - See Bulletin 0187500SSB
POWER RATINGS
Natural Gas Liquid Propane
Single-Phase 120/240 VAC @1.0pf 144 kW Amps: 600 134 kW Amps: 558
Three-Phase 120/208 VAC @0.8pf 150 kW Amps: 521 140 kW Amps: 486
Three-Phase 120/240 VAC @0.8pf 150 kW Amps: 452 140 kW Amps: 421
Three-Phase 277/480 VAC @0.8pf 150 kW Amps: 226 140 kW Amps: 211
Three-Phase 346/600 VAC @0.8pf 150 kW Amps: 181 140 kW Amps: 169
MOTOR STARTING CAPABILITIES (skVA)
skVA vs. Voltage Dip
277/480 VAC 30% 208/240 VAC 30%
K0150124Y26 327 K0150124Y26 250
K0200124Y21 478 K0200124Y21 361
FUEL CONSUMPTION RATES*
Natural Gas – scfh (m3/hr) Propane Vapor – scfh (m
3/hr) Propane Liquid – gph (Lph)
Percent Load Standby Percent Load Standby Percent Load Standby
25% 668 (18.9) 25% 280 (7.9) 25% 6.7 (25.4)
50% 1,127 (31.9) 50% 430 (12.2) 50% 11.4 (43.1)
75% 1,583 (44.8) 75% 573 (16.2) 75% 15.7 (59.4)
100% 2,042 (57.8) 100% 720 (20.4) 100% 20.0 (75.7)
* Fuel supply installation must accommodate fuel consumption rates at 100% load.
COOLING
Standby
Air Flow (Fan Air Flow Across Radiator) sfcm (m
3/min) 5,598 (158.5)
Coolant Flow gpm (Lpm) 27.5 (104.1)
Coolant System Capacity gal (L) 6.3 (24)
Maximum Operating Ambient Temperature °F (°C) 122 (50)
Maximum Operating Ambient Temperature (Before Derate) See Bulletin No. 0199270SSD
Maximum Radiator Backpressure in H2O (kPa) 0.5 (0.12)
COMBUSTION AIR REQUIREMENTS
Standby
Flow at Rated Power scfm (m3/min) 342.7 (9.7)
ENGINE EXHAUST
Standby Standby
Rated Engine Speed RPM 1,800 Exhaust Flow (Rated Output) scfm (m
3/min) 1,205.8 (34.1)
Horsepower at Rated kW** hp 229 Maximum Backpressure (Post Silencer) inHg (kPa) 0.75 (2.54)
Piston Speed ft/min (m/min) 1,275 (389) Exhaust Temp (Rated Output - Post Silencer) °F (°C) 1,440 (782)
BMEP psi (kPa) 185 (1,277)
OPERATING DATA

MG150 | 9.0L | 150 kW
INDUSTRIAL SPARK-IGNITED GENERATOR SET
EPA Certified Stationary Emergency and Non-Emergency
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YOUR FACTORY RECOGNIZED GENERAC INDUSTRIAL DEALER
Specification characteristics may change without notice. Dimensions and weights are for preliminary purposes only. Please contact a Generac Power Systems Industrial Dealer for detailed installation drawings.
* All measurements are approximate and for estimation purposes only.
Part No. 0K6450C
Rev. E 04/25/19
Generac Power Systems, Inc. | P.O. Box 8 | Waukesha, WI 53189
P: [phone] ©2019 Generac Power Systems, Inc. All rights reserved. All specifications are subject to change without notice.
DIMENSIONS AND WEIGHTS*
L
L
L
L W
W
W
W
H
H
H
H
H
OPEN SET (Includes Exhaust Flex)
L x W x H - in (mm) 116.5 (2,959) x 49.7 (1,262) x 55.6 (1,412)
Weight - lbs (kg) 2,840 - 2,948 (1,288 - 1,337)
WEATHER PROTECTED ENCLOSURE
L x W x H - in (mm) 143.0 (3,632) x 50.4 (1,280) x 68.2 (1,732)
Weight - lbs (kg)Steel: 3,737 - 3,845 (1,695 - 1,744)
Aluminum: 3,278 - 3,386 (1,487 - 1,536)
LEVEL 1 ACOUSTIC ENCLOSURE
L x W x H - in (mm) 168.5 (4,280) x 50.4 (1,280) x 68.2 (1,732)
Weight - lbs (kg)Steel: 4,023 - 4,131 (1,825 - 1,874)
Aluminum: 3,111 - 3,157 (1,411 - 1,432)
LEVEL 2 ACOUSTIC ENCLOSURE
L x W x H - in (mm) 143.0 (3,632) x 50.4 (1,280) x 91.7 (2,329)
Weight - lbs (kg)Steel: 4,215 - 4,323 (1,912 - 1,961)
Aluminum: 3,486 - 3,594 (1,581 - 1,630)
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
2014 MODEL YEAR
CERTIFICATE OF CONFORMITY
WITH THE CLEAN AIR ACT
OFFICE OF TRANSPORTATION
AND AIR QUALITY
ANN ARBOR, MICHIGAN 48105
Certificate Issued To:Generac Power Systems, Inc.
(U.S. Manufacturer or Importer)
Certificate Number: EGNXB08.92C3-055
Effective Date:
11/10/2014
Expiration Date:
12/31/2014
_________________________
Byron J. Bunker, Division Director
Compliance Division
Issue Date:
11/10/2014
Revision Date:
N/A
Manufacturer: Generac Power Systems, Inc.
Engine Family: EGNXB08.92C3
Certification Type: Stationary (Part 60)
Fuel : Natural Gas (CNG/LNG)
Emission Standards : NOx ( g/kW-hr ) : 2.7
VOC ( g/kW-hr ) : 1.3
CO ( g/kW-hr ) : 5.4
Emergency Use Only : Y
Pursuant to Section 213 of the Clean Air Act (42 U.S.C. section 7547) and 40 CFR Part 60, 1065, 1068, and 60 ( stationary only and combined stationary and mobile ) and subject to the terms and conditions
prescribed in those provisions, this certificate of conformity is hereby issued with respect to the test engines which have been found to conform to applicable requirements and which represent the following
nonroad engines, by engine family, more fully described in the documentation required by 40 CFR Part 60 and produced in the stated model year.
This certificate of conformity covers only those new nonroad spark-ignition engines which conform in all material respects to the design specifications that applied to those engines described in the
documentation required by 40 CFR Part 60 and which are produced during the model year stated on this certificate of the said manufacturer, as defined in 40 CFR Part 60. This certificate of conformity does
not cover nonroad engines imported prior to the effective date of the certificate.
It is a term of this certificate that the manufacturer shall consent to all inspections described in 40 CFR 1068.20 and authorized in a warrant or court order. Failure to comply with the requirements of such a
warrant or court order may lead to revocation or suspension of this certificate for reasons specified in 40 CFR Part 60. It is also a term of this certificate that this certificate may be revoked or suspended or
rendered void ab initio for other reasons specified in 40 CFR Part 60.
This certificate does not cover large nonroad engines sold, offered for sale, or introduced, or delivered for introduction, into commerce in the U.S. prior to the effective date of the certificate.
THC NOx CO
QTA25 2.4 EGNXB02.42NN NG No NR EGNXB02.42NN-009 2.14 2.37 93.95 1800 38.39 16.52
QTA25 2.4 EGNXB02.42NL LPG No NR EGNXB02.42NL-014 1.43 4.38 86.18 1800 43.29 17.59
SG035 5.4 EGNXB05.42NN NG No NR EGNXB05.42NN-012 1.60 2.52 95.32 1800 82.10 36.91
SG035 5.4 EGNXB05.42NL LPG No NR EGNXB05.42NL-013 1.24 3.45 112.01 1800 82.30 34.60
SG040 5.4 EGNXB05.42NN NG No NR EGNXB05.42NN-012 1.60 2.52 95.32 1800 82.10 36.91
SG040 5.4 EGNXB05.42NL LPG No NR EGNXB05.42NL-013 1.24 3.45 112.01 1800 82.30 34.60
SG045 5.4 EGNXB05.42NN NG No NR EGNXB05.42NN-012 1.60 2.52 95.32 1800 82.10 36.91
SG045 5.4 EGNXB05.42NL LPG No NR EGNXB05.42NL-013 1.24 3.45 112.01 1800 82.30 34.60
SG050 5.4 EGNXB05.42NN NG No NR EGNXB05.42NN-012 1.60 2.52 95.32 1800 82.10 36.91
SG050 5.4 EGNXB05.42NL LPG No NR EGNXB05.42NL-013 1.24 3.45 112.01 1800 82.30 34.60
SG050 6.8 EGNXB06.82NN NG No NR EGNXB06.82NN-001 1.46 6.57 30.88 1800 84.90 37.17
SG050 6.8 EGNXB06.82NL LPG No NR EGNXB06.82NL-002 1.86 2.67 172.30 1800 84.66 46.55
SG060 6.8 EGNXB06.82NN NG No NR EGNXB06.82NN-001 1.47 2.94 75.88 1800 96.67 38.76
SG060 6.8 EGNXB06.82NL LPG No NR EGNXB06.82NL-002 1.26 4.23 99.05 1800 96.60 41.20
SG070 6.8 EGNXB06.82NN NG No NR EGNXB06.82NN-001 1.46 3.55 68.40 1800 109.72 42.37
SG070 6.8 EGNXB06.82NL LPG No NR EGNXB06.82NL-002 1.26 3.28 111.49 1800 118.41 51.86
SG080 8.0 EGNXB08.02NN NG No NR EGNXB08.02NN-049 1.16 2.86 49.60 1800 127.61 44.02
SG080 (DF) 8.0 EGNXB08.02NN NG/LPV No NR EGNXB08.02NN-049 0.85 4.24 27.29 1800 128.06 42.50
SG080 (DF) 8.0 EGNXB08.02NN NG/LPL No NR EGNXB08.02NN-049 1.23 4.09 37.06 1800 127.90 42.60
SG080 8.0 EGNXB08.02NL LPV No NR EGNXB08.02NL-050 0.95 2.24 86.43 1800 127.46 50.13
SG080 8.0 EGNXB08.02NL LPL No NR EGNXB08.02NL-050 1.00 2.77 71.36 1800 128.09 46.61
Comb
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DATA
STATEMENT OF EXHAUST EMISSIONS      
2014 SPARK‐IGNITED GENERATORS       
INDUSTRIAL SERIES ‐ NON‐CALIFORNIA  
1 of 2
Grams/bhp-hr.
Model Engine
EPA Engine
Family Fuel CAT
Req'd BHP Fuel Flow
(lb/hr)
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SG080 9.0 EGNXB08.92NN NG No NR EGNXB08.92NN-003 0.94 3.91 41.13 1800 125.96 44.32
SG080 (DF) 9.0 EGNXB08.92NN NG/LPV No NR EGNXB08.92NN-003 0.76 2.81 42.10 1800 124.83 46.19
SG080 (DF) 9.0 EGNXB08.92NN NG/LPL No NR EGNXB08.92NN-003 0.69 2.89 30.46 1800 124.61 44.16
SG080 9.0 EGNXB08.92NL LPV No NR EGNXB08.92NL-004 0.78 2.67 78.16 1800 126.21 49.55
SG080 9.0 EGNXB08.92NL LPL No NR EGNXB08.92NL-004 1.11 4.02 67.70 1800 120.57 50.62
SG080 9.0 EGNXB08.92NN NG No NR EGNXB08.92NN-003 0.94 3.91 41.13 1800 125.96 44.32
SG080 (DF) 9.0 EGNXB08.92NN NG/LPV No NR EGNXB08.92NN-003 0.76 2.81 42.10 1800 124.83 46.19
SG080 (DF) 9.0 EGNXB08.92NN NG/LPL No NR EGNXB08.92NN-003 0.69 2.89 30.46 1800 124.61 44.16
SG080 9.0 EGNXB08.92NL LPV No NR EGNXB08.92NL-004 0.78 2.67 78.16 1800 126.21 49.55
SG080 9.0 EGNXB08.92NL LPL No NR EGNXB08.92NL-004 1.11 4.02 67.70 1800 120.57 50.62
SG130 6.8 EGNXB06.82C3 NG Yes Cat Muff EGNXB06.82C3-031 0.06 0.05 0.92 3000 193.49 72.31
SG130 6.8 EGNXB06.82C4 LPG Yes Cat Muff EGNXB06.82C4-032 0.03 0.21 1.06 3000 208.48 79.99
SG130 (DF) 6.8 EGNXB06.82C3 NG & LP Yes Cat Muff EGNXB06.82C3-031 0.06 0.05 0.92 3000 193.49 72.31
SG150 6.8 EGNXB06.82C3 NG Yes Cat Muff EGNXB06.82C3-031 0.18 0.14 1.54 3600 231.00 91.34
SG150 6.8 EGNXB06.82C4 LPG Yes Cat Muff EGNXB06.82C4-032 0.03 1.18 1.56 3600 230.13 89.41
SG150 (DF) 6.8 EGNXB06.82C3 NG & LP Yes Cat Muff EGNXB06.82C3-031 0.18 0.14 1.54 3600 231.00 91.34
SG100 9.0 EGNXB08.92C1 NG Yes Cat Muff EGNXB08.92C1-034 0.17 0.003 0.06 1800 148.90 46.86
SG100 (DF) 9.0 EGNXB08.92C1 NG/LPV Yes Cat Muff EGNXB08.92C1-034 0.30 0.400 0.79 1800 133.16 45.36
SG100 (DF) 9.0 EGNXB08.92C1 NG/LPL Yes Cat Muff EGNXB08.92C1-034 0.34 0.006 1.10 1800 135.75 45.47
SG100 9.0 EGNXB08.92C2 LPG Yes Cat Muff EGNXB08.92C2-035 0.03 0.08 0.13 1800 157.67 53.08
SG100 9.0 EGNXB08.92C2 LPL Yes Cat Muff EGNXB08.92C2-035 0.07 0.04 0.30 1800 156.15 54.47
SG130,150 9.0 EGNXB08.92C3 NG Yes Cat Muff EGNXB08.92C3-055 0.10 0.03 0.02 1800 230.30 71.97
SG130,150 (DF) 9.0 EGNXB08.92C3 NG/LPV Yes Cat Muff EGNXB08.92C3-055 0.10 0.03 0.02 1800 230.30 71.97
SG130,150 (DF) 9.0 EGNXB08.92C3 NG/LPL Yes Cat Muff EGNXB08.92C3-055 0.10 0.03 0.02 1800 230.30 71.97
MG130,150 9.0 EGNXB08.92C3 NG Yes Cat Muff EGNXB08.92C3-055 0.10 0.03 0.02 1800 230.30 71.97
MG130,150 (DF) 9.0 EGNXB08.92C3 NG/LPV Yes Cat Muff EGNXB08.92C3-055 0.10 0.03 0.02 1800 230.30 71.97
MG130,150 (DF) 9.0 EGNXB08.92C3 NG/LPL Yes Cat Muff EGNXB08.92C3-055 0.10 0.03 0.02 1800 230.30 71.97
SG130, 150 9.0 EGNXB08.92C4 LPG Yes Cat Muff EGNXB08.92C4-054 0.02 0.57 1.30 1800 230.30 75.43
SG130, 150 9.0 EGNXB08.92C4 LPL Yes Cat Muff EGNXB08.92C4-054 0.02 0.57 1.30 1800 230.30 75.43
MG130,150 9.0 EGNXB08.92C4 LPG Yes Cat Muff EGNXB08.92C4-054 0.02 0.57 1.30 1800 230.30 75.43
MG130,150 9.0 EGNXB08.92C4 LPL Yes Cat Muff EGNXB08.92C4-054 0.02 0.57 1.30 1800 230.30 75.43
SG150 12.9 EGNXB12.92C2 NG Yes Cat Muff EGNXB12.92C2-039 0.53 0.13 0.53 1800 307.87 107.99
MG150 12.9 EGNXB12.92C2 NG Yes Cat Muff EGNXB12.92C2-039 0.53 0.13 0.53 1800 307.87 107.99
SG175 12.9 EGNXB12.92C2 NG Yes Cat Muff EGNXB12.92C2-039 0.53 0.13 0.53 1800 307.87 107.99
SG200 12.9 EGNXB12.92C2 NG Yes Cat Muff EGNXB12.92C2-039 0.53 0.13 0.53 1800 307.87 107.99
MG200 12.9 EGNXB12.92C2 NG Yes Cat Muff EGNXB12.92C2-039 0.53 0.13 0.53 1800 307.87 107.99
SG230 12.9 EGNXB12.92C2 NG Yes Cat Muff EGNXB12.92C2-039 0.38 0.03 0.53 1800 379.10 125.30
SG250 12.9 EGNXB12.92C2 NG Yes Cat Muff EGNXB12.92C2-039 0.38 0.03 0.53 1800 379.10 125.30
MG250 12.9 EGNXB12.92C2 NG Yes Cat Muff EGNXB12.92C2-039 0.38 0.03 0.53 1800 379.10 125.30
SG275 12.9 EGNXB12.92C3 NG Yes Cat Muff EGNXB12.92C3-041 0.06 0.06 0.81 2150 477.00 164.20
SG300 12.9 EGNXB12.92C3 NG Yes Cat Muff EGNXB12.92C3-041 0.06 0.06 0.81 2150 477.00 164.20
MG300 12.9 EGNXB12.92C3 NG Yes Cat Muff EGNXB12.92C3-041 0.06 0.06 0.81 2150 477.00 164.20
SG350 21.9 EGNXB21.92C1 NG Yes Cat Muff EGNXB21.92C1-042 0.18 0.14 0.82 1800 636.00 201.17
MG350 21.9 EGNXB21.92C1 NG Yes Cat Muff EGNXB21.92C1-042 0.18 0.14 0.82 1800 636.00 201.17
SG400 21.9 EGNXB21.92C1 NG Yes Cat Muff EGNXB21.92C1-042 0.18 0.14 0.82 1800 636.00 201.17
MG400 21.9 EGNXB21.92C1 NG Yes Cat Muff EGNXB21.92C1-042 0.18 0.14 0.82 1800 636.00 201.17
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Generac Power Systems, Inc. • S45 W29290 HWY. 59, Waukesha, WI 53189 • generac.com
©2014 Generac Power Systems, Inc. All rights reserved. All specifications are subject to change without notice. Bulletin 0K7426   Rev D 11/25/14
DF: Dual Fuel
NR: Not Required
Refer to page 2 for definitions and advisory notes.
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EXHAUST EMISSIONS
DATA STATEMENT OF EXHAUST EMISSIONS
2014 SPARK-IGNITED GENERATORS
2014 EPA SPARK-IGNITED EXHAUST EMISSIONS DATA
Effec ve since 2009, the EPA has implemented exhaust emissions regula ons on sta onary spark-ignited (gaseous) engine generators for emergency applica ons.
All Generac spark-ignited gensets, including SG, MG, QTA and QT series gensets, that are built with engines manufactured in 2009 and later meet the requirements
of 40CFR part 60 subpart JJJJ and are EPA cer fied. These generator sets are labeled as EPA Cer fied with decals affixed to the engines’ valve covers.
The a ached documents summarize the general informa on relevant to EPA cer fica on on these generator sets. This informa on can be used for submi data and for permi ng
purposes, if required. These documents include the following informa on:
EPA Engine Family
The EPA Engine Family is assigned by the Manufacturer under EPA guidelines for cer fica on purposes and appears on the EPA cer ficate.
Catalyst Required
Indicates whether an exhaust catalyst and Air/Fuel Ra o control system are required on the generator se o meet EPA cer fica on requirements.
Generally, units rated 80kW and smaller do not require a catalyst to meet EPA cer fica on requirements. Please note that some units that do not
require a catalyst to meet EPA requirements do need a catalyst if the California SCAQMD op on is selected. Please see
"California SCAQMD" below for addi onal informa on on this op on.
Combina on Catalyst or Separate Catalyst
SG and MG series generator sets typically u ze a single combina on catalyst/silencer as part of mee ng EPA cer fica on requirements. Many QT
and QTA series generator sets use the same engines as SG and MG series units, but have different exhaust configura ons that require the use of
conven onal silencers with addi onal separate catalysts installed.
EPA Cer ficate Number
Upon cer fica on by the EPA, a Cer ficate Number is assigned by the EPA.
Emissions Actuals -Grams/bhp-hr
Actual exhaust emission data for Total Hydrocarbons (THC), Nitrogen Oxides (NOx) and Carbon Monoxide (CO) that were submi ed to EPA and are official data of record for cer fica on. This data can be used for permi ng if necessary. Values are expressed in gramsper brake horsepower-
hour; to convert to grams/kW-hr, mul ply by 1.341. Please see advisory notes below for further informa on.
California Units, SCAQMD CEP Number
A separate low-emissions op on is available on many Generac gaseous-fueled generator sets to comply with the more stringent South Coast Air Quality
Management District requirements that are recognized in certain areas in California. Gensets that include this op on are also EPA Cer fied.
General Advisory Note to Dealers
The informa on provided here is proprietary to Generac and its’ authorized dealers. This informa on may only be disseminated upon request, to regulatory governmental bodies for
emissions permi ng purposes or to specifying organiza ons as submi data when expressly required by project specifica ons, and shall remain confiden al and not open to public
viewing. This informa on is not intended for compila on or sales purposes and may not be used as such, nor may it be reproduced without the expressed wri en permission of
Generac Power Systems, Inc.
Advisory Notes on Emissions Actuals•The stated values are actual exhaust emission test measurements obtained from units representa ve of the generator types and engines described.
•Values are official data of record as submi ed to the EPA and SCAQMD for cer fica on purposes. Tes g was conducted in accordance with prevailing EPA
protocols, which are typically accepted by SCAQMD and other regional author es.
•No emission values provided are to be construed as guarantees of emissions levels for any given Generac generator unit.
•Generac Power Systems reserves the right to revise this informa on without prior no ce.
•Consult state and local regulatory agencies for specific permi ng requirements.
•The emissions performance data supplied by the equipment manufacturer is only one element required toward comple on of the permi ng and installa on
process. State and local regula ons may vary on a case-by-case basis and must be consulted by the permit applicant/equipment owner prior to equipment
purchase or installa on. The data supplied herein by Generac Power Systems cannot be construed as a guarantee of installability of the generator set.
•The emission values provided are the result of mul -mode, weighted scale tes g in accordance with EPA tes g regula ons, and may not be representa ve of
any specific load point.
•The emission values provided are not to be construed as emission limits.
Generac Power Systems, Inc. • S45 W29290 HWY. 59, Waukesha, WI 53189 • generac.com
©2014 Generac Power Systems, Inc. All rights reserved. All specifica s are subject to change without no e. Bulle n 0K7426 rev D 11/25/14
11/16/23, 1:51 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r81338030019385…1/7
Tim Dejulis <[e-mail]>
Hawley Rock's NOI
14 messages
Tim Dejulis <[e-mail]>Tue, Feb 28, 2023 at 2:06 PM
To: "[e-mail]" <[e-mail]>
Cc: Alan Humpherys <[e-mail]>
Randa,
My name is Timothy DeJulis and I have been assigned to go through the Notice-of-Intent (NOI) offered to us from Hawley
Rock . I have comments on the NOI.
The generator engine uses AP-42 emission factors. The generator engine will operate for 3,744 hrs 12-month period. The
Generac engine provided has no emission information, which is why I presume Hawley Rock's (Hawley) went with AP-42.
There is a Maximum Available Control Technology (MACT) standard that applies to the diesel fueled generator engine,
found in 40 CFR 63.
In MACT Subpart ZZZZ, there is a CO emission limit of 230 ppmv or less for a diesel fueled generator engine at 226 hp.
We need the emission information to confirm that this generator engine is at or below this value. Could we have the new
generator engine emission information supplied to us please? I can explain this further if you would like. Thank you.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
Bryant Bunnell <[e-mail]>Wed, Mar 15, 2023 at 10:49 AM
To: Tim Dejulis <[e-mail]>
Hi Tim,

I hope you are doing well. Judging by how many projects you are over right now I’m sure you’re busy. The Hawley’s
reached out to me and asked if I can help getting you the information you need. In the future, go ahead and copy me on
any correspondence regarding this permitting action.

You mention MACT requirements regarding a diesel engine. They are attempting to permit a generator that runs on
natural gas. Let me know if you are still needing emissions information considering it being a natural gas unit.

Thanks,
Bryant Bunnell

11/16/23, 1:51 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r81338030019385…2/7
[Quoted text hidden]
Tim Dejulis <[e-mail]>Tue, Mar 21, 2023 at 9:54 AM
To: Bryant Bunnell <[e-mail]>
Bryant,
I apologize for making the mistake of having this generator engine fueled by diesel instead of natural gas. I don't need any
more information from Hawley Rock to make progress on their NOI. I will be sending Hawley Rock's engineering review to
the peer reviewer this week. Again, I'm sorry for the error on Hawley Rock's project.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
[Quoted text hidden]
Bryant Bunnell <[e-mail]>Tue, Mar 21, 2023 at 10:08 AM
To: Tim Dejulis <[e-mail]>
No problem Tim, I know you guys have a lot on your plate right now. I do have a queson regarding an
applicaon I sent for TSJ construcon. Have you been able to look at those forms? Let me know if you have
any quesons. It's my first me helping with a mobile permit applicaon so I might need help making sure
you have all the info you need.
Thanks,
Bryant Bunnell
From: Tim Dejulis <[e-mail]>
Sent: Tuesday, March 21, 2023 9:54 AM
To: Bryant Bunnell <[e-mail]>
Subject: Re: Hawley Rock's NOI

[Quoted text hidden]
Tim Dejulis <[e-mail]>Thu, Apr 20, 2023 at 12:21 PM
To: Bryant Bunnell <[e-mail]>, [e-mail]
Bryant,
My peer wants to see the emission factors for the brand new generator engine in order to sign off on the engineering
review. The specification sheet offered in the NOI doesn't have any emission factors included. Could we have the
emission factors for NOx, CO, and VOC for the natural gas generator engine? Thank you.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
11/16/23, 1:51 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r81338030019385…3/7
airquality.utah.gov
[Quoted text hidden]
Bryant Bunnell <[e-mail]>Tue, May 2, 2023 at 12:28 PM
To: Tim Dejulis <[e-mail]>, "[e-mail]" <[e-mail]>
Hi Tim,

I have heard back from the manufacturer and I’ve attached the emissions specs for this generator they provided. I’ve
highlighted the data for the engine family that this generator is associated. At first glance it looks like the manufacturers
emissions factors are much less conservative than that found in the AP-42 compilation. Let me know if you have any more
questions. I hope we can get this project off your plate soon.

Thanks,
Bryant

From: Tim Dejulis <[e-mail]>
Sent: Thursday, April 20, 2023 12:21 PM
To: Bryant Bunnell <[e-mail]>; [e-mail]
Subject: Re: Hawley Rock's NOI

Bryant,

My peer wants to see the emission factors for the brand new generator engine in order to sign off on the engineering
review. The specification sheet offered in the NOI doesn't have any emission factors included. Could we have the
emission factors for NOx, CO, and VOC for the natural gas generator engine? Thank you.

Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov

[Quoted text hidden]
11/16/23, 1:51 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r81338030019385…4/7
0K7426.pdf
1882K
Tim Dejulis <[e-mail]>Thu, May 4, 2023 at 10:13 AM
To: Bryant Bunnell <[e-mail]>
Cc: "[e-mail]" <[e-mail]>
Bryant,
I will advise other sources using a NG fired generator engine that they can find a unit with as low an emission value as
this! Thank you for supplying this to us!
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
[Quoted text hidden]
Tim Dejulis <[e-mail]>Thu, Aug 24, 2023 at 3:22 PM
To: Bryant Bunnell <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Enqiang He <[e-mail]>
Bryant,
My peer and I have questions about the emissions factors for the new generator engine and the BACT analysis.
Could we get a revised emission estimate calculation for the engine operation, showing the reduced emission factors for
NOx, CO, and VOC, included in the Generac spec sheet? The emission estimate calculations submitted use AP-42
generator emissions factors, which are very large compared to what the DAQ expects. Also, there needs to be a BACT
discussion included in the NOI. It is referenced as section V in the title of the NOI, but is not included in the paperwork.
If there are any questions, let me know.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
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Tim Dejulis <[e-mail]>Tue, Sep 26, 2023 at 12:38 PM
To: Bryant Bunnell <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Enqiang He <[e-mail]>, Alan Humpherys
<[e-mail]>
Bryant,
11/16/23, 1:51 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r81338030019385…5/7
We are waiting for a calculation regarding the lower emitting NG generator engine and a discussion in the BACT analysis
section of the NOI. Is there anything I can do to help with this? Please let me know soon.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
[Quoted text hidden]
Tim Dejulis <[e-mail]>Wed, Nov 8, 2023 at 12:39 PM
To: Bryant Bunnell <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Enqiang He <[e-mail]>, Alan Humpherys
<[e-mail]>
Bryant,
It's been nearly two months since my last correspondence with Hawley Rock, with no response at all. Be advised that if
we don't get a response in the next few days, the DAQ will consider cancelling the pending NOI. How can we help to get
this issue I raised three months ago resolved? Please advise.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
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JOHN <[e-mail]>Wed, Nov 8, 2023 at 12:57 PM
To: Tim Dejulis <[e-mail]>
I'm reaching out to Mr. Bunnell. Thank you!
From: Tim Dejulis <[e-mail]>
Sent: Wednesday, November 8, 2023 12:39 PM
To: Bryant Bunnell <[e-mail]>
Cc: [e-mail] <[e-mail]>; Enqiang He <[e-mail]>; Alan Humpherys
<[e-mail]>
[Quoted text hidden]

[Quoted text hidden]
Bryant Bunnell <[e-mail]>Wed, Nov 8, 2023 at 1:06 PM
To: Tim Dejulis <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Enqiang He <[e-mail]>, Alan Humpherys
<[e-mail]>
11/16/23, 1:51 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r81338030019385…6/7
Hi Tim,
I'm not sure why your emails aren't popping up in my primary inbox. I'll try and figure out what's going on. I
can see your requests in the thread below and I'll jump on this right away. Unl I figure out this email issue,
please include this addional email address to any correspondence moving forward:
[e-mail].
Thanks,
Bryant
From: Tim Dejulis <[e-mail]>
Sent: Wednesday, November 8, 2023 12:39 PM
To: Bryant Bunnell <[e-mail]>
Cc: [e-mail] <[e-mail]>; Enqiang He <[e-mail]>; Alan Humpherys
<[e-mail]>
[Quoted text hidden]

[Quoted text hidden]
Bryant Bunnell <[e-mail]>Thu, Nov 16, 2023 at 12:18 PM
To: Tim Dejulis <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Enqiang He <[e-mail]>, Alan Humpherys
<[e-mail]>
Tim,
Secon V of the NOI, that was sent to Mr. Humpherys on 11/30/2022, did include a BACT analysis discussion. It’s at
the boom of page 1. If this needs to be modified or if you have quesons let me know.
Find below, the revised esmated emissions specific to the new generator, that reflect the emissions factors given in
the spec sheet for NOx, CO, and VOCs. If you’d like me to send a formal response that includes the other porons of
the NOI please let me know. Contact me with any quesons.
Thanks,
Bryant
Emissions Results – Natural Gas Generator
Analyte Emission Factor
(Grams/bhp-hr.)
Emission Factor
(lbs./hp-hr.) hr./yr. bhp Emissions
(lbs./hr.)
Emissions
(tons/yr.)
NOX 3.00E-02 6.61E-05
3744 226
0.01 0.03
CO 2.00E-02 4.41E-05 0.01 0.02
VOCs* 1.00E-01 2.20E-04 0.05 0.09
*The THC factor given in the manufacturer’s published emissions data accounts for VOC emissions.
Source: Manufacturer’s Specificaons provided in the previous submial.
Emissions Results-Natural Gas Generator
Analyte Emission Factor
(lbs./MMBtu)
Emission
Factor
(lbs./hp-
hr.)
Engine Rated Output
(MMBtu/hr.) hr./yr. bhp Emissions
(lb./hr.)
Emissions
(tons/yr.)
CO2 1.10E+02 7.86E-01 1.61466 3744 226 177.61 332.5
SO2 5.88E-04 4.20E-06 0.001 0.002
TOC 3.58E-01 2.56E-03 0.58 1.1
Methane 2.30E-01 1.64E-03 0.37 0.7
11/16/23, 1:51 PM State of Utah Mail - Hawley Rock's NOI
https://mail.google.com/mail/u/0/?ik=67721adfe9&view=pt&search=all&permthid=thread-a:r-7546409347609045761&simpl=msg-a:r81338030019385…7/7
PM10 9.50E-03 6.79E-05 0.02 0.03
PM2.5 9.50E-03 6.79E-05 0.02 0.03
PM 9.91E-03 7.08E-05 0.02 0.03
Source: AP-42, Vol. I, 3:2, Table 3.2-3
From: Tim Dejulis <[e-mail]>
Sent: Wednesday, November 8, 2023 12:39 PM
To: Bryant Bunnell <[e-mail]>
Cc: [e-mail] <[e-mail]>; Enqiang He <[e-mail]>; Alan Humpherys
<[e-mail]>
[Quoted text hidden]

[Quoted text hidden]
Tim Dejulis <[e-mail]>Thu, Nov 16, 2023 at 1:50 PM
To: Bryant Bunnell <[e-mail]>
Cc: "[e-mail]" <[e-mail]>, Enqiang He <[e-mail]>, Alan Humpherys
<[e-mail]>
Bryant,
We can use this information in furtherance of creating Hawley's engineering review (ER). Thank you for providing this to
us. I will add this information to Hawley's ER and send it back to the peer reviewer for his signature. Emissions from the
generator engine was the only issue he had, so after he signs this, it will go to modeling and compliance for their review.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
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