DAQ-2025-000384

DAQE-AN129000008-25

{{$d1 }}

Cash Christensen
Bryce Christensen Excavating Inc.
3270 South Quarry Ridge Drive
St. George, UT 84790
[e-mail]

Dear Mr. Christensen:

Re: Approval Order: Administrative Amendment to Approval Order DAQE-AN129000006-18 to
Remove the Diesel Engine and a Sizing Screen and Replace a Crusher
Project Number: N129000008

The attached Approval Order (AO) is issued pursuant to the Notice of Intent (NOI) received on
November 8, 2024. Bryce Christensen Excavating Inc. must comply with the requirements of this AO, all
applicable state requirements (R307), and Federal Standards.

The project engineer for this action is Lucia Mason, 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.

Sincerely,

{{$s }}

Bryce C. Bird
Director

BCB:LM:jg

cc: Southwest Utah Public 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

January 20, 2025

STATE OF UTAH
Department of Environmental Quality
Division of Air Quality

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APPROVAL ORDER
DAQE-AN129000008-25
Administrative Amendment to Approval Order
DAQE-AN129000006-18 to Remove the Diesel Engine
and a Sizing Screen and Replace a Crusher

Prepared By
Lucia Mason, Engineer
[phone]
[e-mail]

Issued to
Bryce Christensen Excavating Inc. - BCE St. George Aggregate Production
Plant

Issued On
{{$d2 }}

Issued By

{{$s }}

Bryce C. Bird
Director
Division of Air Quality

January 20, 2025
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 ..................................................................................... 6
PERMIT HISTORY ..................................................................................................................... 8
ACRONYMS ................................................................................................................................. 9

DAQE-AN129000008-25
Page 3

GENERAL INFORMATION

CONTACT/LOCATION INFORMATION

Owner Name Source Name
Bryce Christensen Excavating Inc. Bryce Christensen Excavating Inc. - BCE St. George Aggregate Production Plant

Mailing Address Physical Address
3270 South Quarry Ridge Drive 3270 South Quarry Ridge Drive
St. George, UT 84790 St. George, UT 84790

Source Contact UTM Coordinates
Name: Cash Christensen 273,916 m Easting
Phone: [phone],103,531 m Northing
Email: [e-mail] Datum NAD83
UTM Zone 12
SIC code 3299 (Nonmetallic Mineral Products, NEC)

SOURCE INFORMATION
General Description
Bryce Christensen Excavating, Inc. (BCE), produces construction aggregate in St. George, Washington
County. Material is excavated using bulldozers and front-end loaders before being fed through a series of
aggregate processing equipment, including three (3) crushers and one (1) screen. Front-end loaders
transfer material from storage piles to trucks to be delivered to customers. BCE produces up to 400,000
tons of processed aggregate material per year.

NSR Classification
Administrative Amendment

Source Classification
Located in Attainment Area
Washington 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

DAQE-AN129000008-25
Page 4

Project Description
BCE has requested an administrative amendment including the following equipment changes:

- Removal of one (1) diesel generator engine, 200 hp
- Removal of one (1) sizing screen
- Removal of one (1) cone crusher, 150 tpy
- Addition of one (1) VSI crusher, 150 tpy (ID II.A.5)

These changes will result in a decrease of emissions. Therefore, these changes qualify as a reduction in air
pollutants and are thus exempt from the requirement to submit a notice of intent and obtain an approval
order prior to construction under R307-401-12.

This amendment also updates condition II.B.2.b to limit the length of unpaved haul roads onsite to 2,550
feet.

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 -380 0.00
Carbon Monoxide -2.20 0.00
Nitrogen Oxides -10.23 0.00
Particulate Matter - PM10 -0.87 14.37
Particulate Matter - PM2.5 -0.74 5.93
Sulfur Oxides -0.68 0.00
Volatile Organic Compounds -0.83 0.00

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Acetaldehyde (CAS #75070) -4 0
Benzene (Including Benzene From Gasoline) (CAS #71432) -4 0
Formaldehyde (CAS #50000) -6 0
Generic HAPs (CAS #GHAPS) -6 0
Change (TPY) Total (TPY)
Total HAPs -0.01 0.00

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]
DAQE-AN129000008-25
Page 5

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

SECTION II: PERMITTED EQUIPMENT
II.A THE APPROVED EQUIPMENT
II.A.1 St. George Aggregate Production Plant II.A.2 Feed Hopper
II.A.3 Impact Crusher Capacity: 150 tons per hour (tph) NSPS Subpart OOO II.A.4 Jaw Crusher Capacity: 250 tph NSPS Subpart OOO
II.A.5 VSI Crusher Capacity: 150 tph NSPS Subpart OOO II.A.6 Sizing Screen NSPS Subpart OOO
DAQE-AN129000008-25
Page 6

II.A.7 Conveyors NSPS Subpart OOO II.A.8 Stackers

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 400,000 tons of aggregate per rolling 12-month
period. [R307-401-8]

II.B.1.a.1 The owner/operator shall: A. Determine aggregate production using customer billing records or weight recordings B. Calculate a new 12-month total by the 20th day of each month using data from the previous 12 months D. Keep records of production for all periods when the plant is in operation C. Keep records of aggregate production on a daily basis. [R307-401-8]
II.B.1.b During the months of April through September, the owner/operator shall only operate between
4:00 AM and 8:00 PM each day, and during the months of October through March, the owner/operator shall only operate between 7:00 AM and 4:00 PM each day.
[R307-401-8, R307-410-4]
II.B.1.b.1 The owner/operator shall keep and maintain the following records of operation for all periods that the source is in operation: A. The time operations began each day B. The time operations ended each day. [R307-401-8, R307-410-5]
II.B.1.c Unless otherwise specified in this AO, the owner/operator shall not allow visible emissions from any stationary point or fugitive emissions source on site to exceed 20% opacity.
[R307-201-3, R307-401-8] II.B.1.c.1 Unless otherwise specified in this AO, opacity observations of emissions from stationary sources shall be conducted according to 40 CFR 60, Appendix A, Method 9. [R307-201-3]
II.B.2 Haul Roads and Fugitive Dust Sources: II.B.2.a The owner/operator shall not allow visible emissions from haul roads and fugitive dust sources on site to exceed 20% opacity. [R307-205-4]
DAQE-AN129000008-25
Page 7

II.B.2.a.1 Visible emission determinations for fugitive dust from haul roads and fugitive dust sources 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:
A. Not exceed 2,550 feet of unpaved in-plant haul roads B. Pave no less than 1,300 feet in length of in-plant haul roads.
[R307-401-8]
II.B.2.b.1 The owner/operator shall determine haul road lengths using aerial photographs, land surveys, on-site measurements, or other methods as approved by the Director. [R307-401-8]
II.B.2.c The owner/operator shall sweep and apply water to the paved in-plant haul roads to ensure the
opacity limits in this AO are not exceeded. [R307-401-8]
II.B.2.d The owner/operator shall use water application or other control options contained in R307-205 to minimize emissions from fugitive dust and fugitive emissions sources, including haul roads, storage piles, and disturbed areas. The owner/operator shall apply controls such that the opacity limits in this AO are not exceeded. [R307-205, R307-401-8]
II.B.2.d.1 The owner/operator shall keep and maintain records of water application for all periods that the source is in operation. Records of water application shall include:

A. Date of treatment
B. Time of day that water was applied
C. Quantity of water applied.

[R307-401-8]
II.B.3 Aggregate Processing Equipment Requirements
II.B.3.a The owner/operator shall not exceed the following opacity limits at the listed point sources:
A. The impact crusher - 15%

B. All other crushers - 12%
C. Screens - 10%

D. Conveyor transfer points - 10%

E. Drop transfer points and stackers - 20%.

[40 CFR 60 Subpart OOO, R307-201-3, R307-401-8]

II.B.3.b 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. The owner/operator shall operate sprays such that the opacity limits in this AO are not exceeded. [R307-401-8]

DAQE-AN129000008-25
Page 8

II.B.4 Initial Observations Under NSPS Subpart OOO II.B.4.a The owner/operator shall conduct an initial performance test for all crushers, screens, and
conveyor transfer points on site. Performance tests shall meet the limitations specified in Table 3 to Subpart OOO. [40 CFR 60 Subpart OOO]
II.B.4.a.1 Initial performance tests for fugitive emissions limits shall be conducted according to 40 CFR 60.675(c). The owner or 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.4.a.2 The owner/operator shall keep and maintain records of the initial performance test for each crusher, screen, and conveyor according to 40 CFR 60.7(f).
[40 CFR 60 Subpart A, 40 CFR 60 Subpart OOO]
II.B.4.a.3 The owner/operator shall submit results of the initial performance test for each crusher, screen, and conveyor according to 40 CFR 60.8(a). [40 CFR 60 Subpart A, 40 CFR 60 Subpart OOO]
PERMIT HISTORY

This Approval Order shall supersede (if a modification) or will be based on the following documents: Supersedes AO DAQE-AN129000006-18 dated April 2, 2018 Is Derived From NOI dated November 8, 2024 Incorporates Additional Information dated November 12, 2024 Incorporates Additional Information dated December 24, 2024

DAQE-AN129000008-25
Page 9

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

Engineering Review N129000006: Bryce Christensen Excavating Inc.- BCE St. George Aggregate Production Plant -
Modification to DAQE-AN0129000005-08 to Add a Cone Crusher and a Jaw Crusher with an Attached Engine
February 20, 2018
Page 1
UTAH DIVISION OF AIR QUALITY
SOURCE PLAN REVIEW

Bryce Christensen
Bryce Christensen Excavating Inc.
2052 East 3200 South
St. George, UT 84790
Project Number: N129000006

RE: Modification to DAQE-AN0129000005-08 to Add a Cone
Crusher and a Jaw Crusher with an Attached Engine
Washington County; CDS B; MACT (Part 63), Title V
(Part 70), Attainment Area, NSPS (Part 60),

Review Engineer: Mr. Alan Humpherys
Date: February 20, 2018

Notice of Intent Submitted: March 10, 2017

Plant Contact: Bryce Christensen
Phone Number: [phone]
Fax Number: [phone]

Source Location: 2052 East 3200 South, St. George, UT
Washington County
4,103,700 m Northing, 274,000 m Easting, UTM Zone 12
UTM Datum: NAD83

DAQ requests that a company/corporation official read the attached draft/proposed Plan Review with
Recommended Approval Order Conditions. If this person does not understand or does not agree with the
conditions, the review engineer should be contacted within five days after receipt of the Plan Review. If
this person agrees with the Plan Review and Recommended Approval Order Conditions, this person
should sign below and return (FAX # [phone]) within 10 days after receipt of the conditions. If the
review engineer is not contacted within 10 days, the review engineer shall assume that the
company/corporation official agrees with this Plan Review and will process the Plan Review towards
final approval. A public comment period will be required before the Approval Order can be issued.

Applicant Contact ______________________________________________________________
(Signature & Date)

Engineering Review N129000006: Bryce Christensen Excavating Inc.- BCE St. George Aggregate Production Plant -
Modification to DAQE-AN0129000005-08 to Add a Cone Crusher and a Jaw Crusher with an Attached Engine
February 20, 2018
Page 2
ABSTRACT

Bryce Christensen Excavating, Inc. (BCE), has requested a modification to DAQE-AN0129000005-08,
dated December 30, 2008. BCE has requested to add a jaw crusher with an attached diesel-fired engine
and a cone crusher to the St. George Aggregate Production Plant. The annual aggregate production of
400,000 tons per year will remain the same.

The source is located in St. George, Washington County. Washington County is an attainment area of the
NAAQS for all criteria pollutants. 40 CFR 60 (NSPS Subpart A, OOO, and IIII), and 40 CFR 63 (MACT
Subpart A, and ZZZZ) regulations apply to this source. 40 CFR 61 (NESHAP) regulations do not apply to
this source. Title V of the 1990 CAA applies to this source as an area source.

The PTE, in TPY, will change as follows:
PM10 + 9.77, PM2.5 + 3.93, NOx + 10.23, SOx + 0.68, CO + 2.20, VOC + 0.83, HAP + 0.01, CO2e + 380

The PTE, in TPY, will be as follows:
PM10 = 15.24, PM2.5 = 6.67, NOx = 10.23, SO2 = 0.68, CO = 2.20, VOC = 0.83, HAPs =0.01, CO2e = 380.

SOURCE SPECIFIC DESIGNATIONS

Applicable Programs:
NSPS (Part 60), Subpart A: General Provisions applies to St. George Aggregate Production Plant
NSPS (Part 60), Subpart OOO: Standards of Performance for Nonmetallic Mineral Processing Plants
applies to Cone Crusher (new)
NSPS (Part 60), Subpart OOO: Standards of Performance for Nonmetallic Mineral Processing Plants
applies to Impact Crusher
NSPS (Part 60), Subpart OOO: Standards of Performance for Nonmetallic Mineral Processing Plants
applies to Jaw Crusher (new)
NSPS (Part 60), Subpart OOO: Standards of Performance for Nonmetallic Mineral Processing Plants
applies to Two (2) Sizing Screens
NSPS (Part 60), Subpart OOO: Standards of Performance for Nonmetallic Mineral Processing Plants
applies to Various Conveyors and Stackers
NSPS (Part 60), Subpart IIII: Standards of Performance for Stationary Compression Ignition Internal
Combustion Engines applies to Generator Engine (new)
MACT (Part 63), Subpart A: General Provisions applies to St. George Aggregate Production Plant
MACT (Part 63), Subpart ZZZZ: National Emissions Standards for Hazardous Air Pollutants for
Stationary Reciprocating Internal Combustion Engines applies to Generator Engine (new)
Attainment Area applies to St. George Aggregate Production Plant
Title V (Part 70) applies to St. George Aggregate Production Plant

Engineering Review N129000006: Bryce Christensen Excavating Inc.- BCE St. George Aggregate Production Plant -
Modification to DAQE-AN0129000005-08 to Add a Cone Crusher and a Jaw Crusher with an Attached Engine
February 20, 2018
Page 3
Permit History:

When issued, the approval order shall supersede or will be based on the following documents:

Supersedes DAQE-AN0129000005-08 dated December 30, 2008
Is Derived From NOI dated March 10, 2017
Incorporates Additional information dated April 17, 2017
Incorporates Additional information dated June 26, 2017
Incorporates Additional information dated July 9, 2017
Incorporates Additional information dated August 11, 2017
Incorporates Modeling Information dated December 21, 2017
Incorporates Modeling Memo dated January 17, 2018

SUMMARY OF NOTICE OF INTENT INFORMATION

Description of Proposal:

BCE has requested to add a 250 tph jaw crusher with an attached 200 hp diesel-fired engine and a 150 tph
cone crusher to the St. George Aggregate Production Plant. This new equipment will crush additional
aggregate at the source. Aggregate is mined at the source. The mined material is sent to crushers and
screens to process the aggregate. Except for the jaw crusher, the aggregate processing equipment is run
by line power. The jaw crusher is powered by a 200 hp diesel-fired engine. The annual aggregate
production will not change and will remain at 400,000 tons of aggregate produced per year.

Summary of Emission Totals:

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

Estimated Criteria Pollutant Potential Emissions
CO2 Equivalent 380.00 tons/yr
Carbon Monoxide 2.20 tons/yr
Nitrogen Oxides 10.23 tons/yr
Particulate Matter - PM10 15.24 tons/yr
Particulate Matter - PM2.5 6.67 tons/yr
Sulfur Oxides 0.68 tons/yr
Volatile Organic Compounds 0.83 tons/yr

Estimated Hazardous Air Pollutant Potential Emissions
Acetaldehyde (CAS #75070) 4 lbs/yr
Benzene (Including Benzene From Gasoline)
(CAS #71432)
4 lbs/yr
Formaldehyde (CAS #50000) 6 lbs/yr
Generic HAPs (CAS #GHAPS) 6 lbs/yr

Total hazardous air pollutants 20 lbs/yr

Engineering Review N129000006: Bryce Christensen Excavating Inc.- BCE St. George Aggregate Production Plant -
Modification to DAQE-AN0129000005-08 to Add a Cone Crusher and a Jaw Crusher with an Attached Engine
February 20, 2018
Page 4
Review of Best Available Control Technology:

1. BACT review regarding Cone Crusher and Jaw Crusher
PM10 and PM2.5 are emitted from the cone crusher and jaw crusher. Add-on control devices like
baghouses, cyclones, electrostatic precipitators and scrubbers can be used to control PM10 and
PM2.5 emissions. These add-on control devices have high capital and operating costs. The
uncontrolled emissions from one crusher are estimated to be less than 0.5 tons of PM10. Due to
the small amount of emissions, the DAQ considers add-on controls as cost prohibitive. The next
option to control PM10 emissions from crushers is water application. Water application is
estimated to reduce the 0.5 tons of PM10 per crusher to just over 0.1 tons of PM10 per crusher.
Water application to reduce emissions from crushers is very affordable; therefore, water
application is selected as BACT for the crushers. To make sure the water application is
appropriate to control emissions, the crushers will be required to comply with a 12% opacity
limit. The 12% opacity limit is required for new crushers under NSPS Subpart OOO, and in
PM2.5 nonattainment areas in the State of Utah. Regardless of the manufacture date, the cone
crusher and the jaw crusher will be required to meet a 12% opacity limit. This limit will be
included as a permit condition. [Last updated February 20, 2018]

2. BACT review regarding Diesel-Fired Generator Engine
NOx, SO2, CO, PM10, PM2.5, VOC, and HAP are emitted from the diesel-fired generator engine.
There are numerous controls that control these pollutants. EPA has developed emission
standards to account for the various controls that could be implemented on a diesel-fired engine.
These standards are contained in NSPS Subpart IIII and MACT Subpart ZZZZ. Different
emission standards and work practices apply to engines depending on size and manufacture date.
To ensure the diesel-fired generator engine at this source meet the minimum federal
requirements, the NSR Section recommends the following as BACT for the diesel-fired
generator engine:
1. Proper engine tuning and maintenance
2. Visible emissions shall be 20% opacity or less
3. Sulfur content of fuel shall be 15 ppm or less
4. Compliance with the applicable federal standards contained in
a. 40 CFR 60, NSPS, Subpart IIII, and
b. 40 CFR 63, MACT, Subpart ZZZZ. [Last updated February 16, 2018]

Engineering Review N129000006: Bryce Christensen Excavating Inc.- BCE St. George Aggregate Production Plant -
Modification to DAQE-AN0129000005-08 to Add a Cone Crusher and a Jaw Crusher with an Attached Engine
February 20, 2018
Page 5
Modeling Results:

The PTE of PM10 is above the modeling threshold contained in R307-410-4. The PTE of all other
criteria pollutants is below the thresholds contained in R307-410-4. The PTE of all HAP emissions are
below the respective modeling thresholds contained in R307-410-5.

A dispersion modeling analysis was performed for the following source:
Company: Bryce Christensen
Site: Ft Pierce Pit

The individual criteria emission increases triggered the requirement to model under R307-410-4 for the
following pollutants:
-PM10

The following table provides a comparison of the predicted impact plus background (total) with the
National Ambient Air Quality Standards (NAAQS). The predicted total concentrations are less than
their respective NAAQS.

Pollutant Average Impact Total NAAQS Percent
ug/cu.m ug/cu.m ug/cu.m NAAQS
PM10 24-Hour 52.1 120.7 150 80.5%

[Last updated February 16, 2018]

Engineering Review N129000006: Bryce Christensen Excavating Inc.- BCE St. George Aggregate Production Plant -
Modification to DAQE-AN0129000005-08 to Add a Cone Crusher and a Jaw Crusher with an Attached Engine
February 20, 2018
Page 6
RECOMMENDED APPROVAL ORDER CONDITIONS

The intent is to issue an air quality Approval Order (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. The AO will be issued to and will apply to the following:

Name of Permittee:

Bryce Christensen Excavating Inc.
2052 East 3200 South
St. George, UT 84790
Permitted Location:

Bryce Christensen Excavating Inc.- BCE St.
George Aggregate Production Plant
2052 East 3200 South
St. George, UT 84790

UTM coordinates: 274,000 m Easting, 4,103,700 m Northing, UTM Zone 12
UTM Datum: NAD83
SIC code: 3299 (Nonmetallic Mineral Products, NEC)

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]

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

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

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

I.8 The owner/operator shall submit documentation of the status of construction or modification to the
Engineering Review N129000006: Bryce Christensen Excavating Inc.- BCE St. George Aggregate Production Plant -
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February 20, 2018
Page 7
Director within 18 months from the date of this AO. This AO may become invalid if construction
is not commenced within 18 months from the date of this AO or if construction is discontinued for
18 months or more. To ensure proper credit when notifying the Director, send the documentation
to the Director, attn.: NSR Section. [R307-401-18]

Engineering Review N129000006: Bryce Christensen Excavating Inc.- BCE St. George Aggregate Production Plant -
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Section II: SPECIAL PROVISIONS

II.A The approved installations shall consist of the following equipment:

II.A.1 St. George Aggregate Production Plant

II.A.2 Feed Hopper

II.A.3 Impact Crusher
Capacity: 150 tons per hour
NSPS Subpart OOO

II.A.4 Jaw Crusher (new)
Capacity: 250 tons per hour
NSPS Subpart OOO

II.A.5 Cone Crusher (new)
150 tons per hour
NSPS Subpart OOO

II.A.6 Two (2) Sizing Screens
NSPS Subpart OOO

II.A.7 Various Conveyors and Stackers
NSPS Subpart OOO

II.A.8 Generator Engine (new)
Attached to the Jaw Crusher
Rating: 200 hp
Fuel: Diesel Fuel
NSPS Subpart IIII
MACT Subpart ZZZZ

II.B Requirements and Limitations

II.B.1 St. George Aggregate Production Plant shall be subject to the following

II.B.1.a The owner/operator shall not produce more than 400,000 tons of aggregate per rolling 12-month
period. [R307-401-8]

II.B.1.b To determine compliance with a rolling 12-month total the owner/operator shall calculate a new
12-month total by the 20th day of each month using data from the previous 12 months. Records
of aggregate production shall be kept for all periods when the plant is in operation. Aggregate
production shall be determined by customer billing records or weight recordings. The records of
aggregate production shall be kept on a daily basis. [R307-401-8]

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February 20, 2018
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II.B.1.c During the months of April through September, the owner/operator shall only operate between
4:00 AM and 8:00 PM each day, and during the months of October through March, the
owner/operator shall only operate between 7:00 AM and 4:00 PM each day.
[R307-401-8, R307-410-4]

II.B.1.c.1 The owner/operator shall keep and maintain the following records of operation for all periods
that the source is in operation:

A. The time operations began each day

B. The time operations ended each day.

[R307-401-8, R307-410-5]

II.B.1.d Unless otherwise specified in this AO, the owner/operator shall not allow visible emissions from
any stationary point or fugitive emission source on site to exceed 20 percent opacity.
[R307-201-3, R307-401-8]

II.B.1.d.1 Unless otherwise specified in this AO, opacity observations of emissions from stationary sources
shall be conducted according to 40 CFR 60, Appendix A, Method 9. [R307-201-3]

II.B.2 Crushers, Screens, and Conveyors

II.B.2.a The owner/operator shall not allow visible emissions from the impact crusher to exceed 15
percent opacity. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.2.b The owner/operator shall not allow visible emissions from the jaw crusher to exceed 12 percent
opacity. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.2.c The owner/operator shall not allow visible emissions from the cone crusher to exceed 12 percent
opacity. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.2.d The owner/operator shall not allow visible emissions from any screen on site to exceed 10
percent opacity. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.2.e The owner/operator shall not allow visible emissions from any conveyor transfer point on site to
exceed 10 percent opacity. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.2.f The owner/operator shall not allow visible emissions from any conveyor drop point on site to
exceed 20 percent opacity. [R307-401-8]

II.B.2.g 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 ensure the opacity limits in this AO are not exceeded. [R307-401-8]

Engineering Review N129000006: Bryce Christensen Excavating Inc.- BCE St. George Aggregate Production Plant -
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February 20, 2018
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II.B.3 Initial Observations Under NSPS Subpart OOO

II.B.3.a The owner/operator shall conduct an initial performance test for all crushers, screens, and
conveyor transfer points on site. Performance tests shall meet the limitations specified in Table
3 to Subpart OOO. [40 CFR 60 Subpart OOO]

II.B.3.a.1 Initial performance tests for fugitive emissions limits shall be conducted according to 40 CFR
60.675(c). The owner or 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.a.2 The owner/operator shall keep and maintain records of the initial performance test for each
crusher, screen, and conveyor according to 40 CFR 60.7(f).
[40 CFR 60 Subpart A, 40 CFR 60 Subpart OOO]

II.B.3.a.3 The owner/operator shall submit results of the initial performance test for each crusher, screen,
and conveyor according to 40 CFR 60.8(a). [40 CFR 60 Subpart A, 40 CFR 60 Subpart OOO]

II.B.4 Diesel-Fired Generator Engine:

II.B.4.a The owner/operator shall not operate the generator engine for more than 3,300 hours per rolling
12-month period. [R307-401-8]

II.B.4.a.1 To determine compliance with a rolling 12-month total the owner/operator shall calculate a new
12-month total by the 20th day of each month using data from the previous 12 months. Records
of operation shall be kept for all periods when the plant is in operation. Hours of operation shall
be determined by supervisor monitoring and records. The records of hours of operation shall be
kept on a daily basis. [R307-401-8]

II.B.4.b The owner/operator shall comply with the applicable emission limitations in 40 CFR 60.4204
and 40 CFR 63.6603 for the diesel-fired generator engine. [40 CFR 60 Subpart IIII, 40 CFR 63
Subpart ZZZZ, R307-401-8]

II.B.4.b.1 To demonstrate compliance with the condition above, the owner/operator shall comply with the
applicable requirements in 40 CFR 60.4211 and 40 CFR 63.6640. [40 CFR 60 Subpart IIII, 40
CFR 63 Subpart ZZZZ, R307-401-8]

II.B.4.c The owner/operator shall not allow visible emissions from the diesel-fired generator engine to
exceed 20 percent opacity. [R307-201-3, R307-401-8]

II.B.4.d The sulfur content of diesel fuel burned in the diesel-fired generator engine shall not exceed 15
ppm. [40 CFR 60 Subpart IIII, 40 CFR 63 Subpart ZZZZ, R307-401-8]

II.B.4.d.1 The sulfur content shall be determined by ASTM Method D2880-71, D4294-89, or approved
equivalent. Certification of diesel fuel shall be either by the owner/operator's own testing or by
test reports from the diesel fuel marketer. [R307-203-1, R307-401-8]

Engineering Review N129000006: Bryce Christensen Excavating Inc.- BCE St. George Aggregate Production Plant -
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February 20, 2018
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II.B.4.d.2 The owner/operator shall keep and maintain records of the test certification of sulfur content in
diesel fuel. Records of the test certification shall be kept for all periods when the plant is in
operation. [R307-203-1, R307-401-8]

II.B.5 Haul Roads and Fugitive Dust Sources:

II.B.5.a The owner/operator shall not allow visible emissions from haul roads and fugitive dust sources
on site to exceed 20 percent opacity. [R307-205-4]

II.B.5.a.1 Visible emission determinations for fugitive dust from haul roads and fugitive dust sources 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.5.b The paved in-plant haul road shall not be less than 1,300 feet in length. [R307-401-8]

II.B.5.b.1 Haul road length shall be determined by aerial photographs, land surveys, on-site measurements,
or other methods as approved by the Director. [R307-401-8]

II.B.5.c The owner/operator shall sweep and apply water to the paved in-plant haul roads to ensure the
opacity limits in this AO are not exceeded. [R307-401-8]

II.B.5.d The owner/operator shall use water application or other control options contained in R307-205
to minimize emissions from fugitive dust and fugitive emissions sources, including haul roads,
storage piles, and disturbed areas. Controls shall be applied to ensure the opacity limits in this
AO are not exceeded. [R307-205, R307-401-8]

II.B.5.d.1 The owner/operator shall keep and maintain records of water application for all periods that the
source is in operation. Records of water application shall include:

A. Date

B. Time of day that water was applied or sweeping occurred

C. Quantity of water applied.

[R307-401-8]

Engineering Review N129000006: Bryce Christensen Excavating Inc.- BCE St. George Aggregate Production Plant -
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February 20, 2018
Page 12
Section III: APPLICABLE FEDERAL REQUIREMENTS

In addition to the requirements of this AO, all applicable provisions of the following federal programs
have been found to apply to this installation. This AO in no way releases the owner or operator from any
liability for compliance with all other applicable federal, state, and local regulations including UAC
R307.

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
MACT (Part 63), A: General Provisions
MACT (Part 63), ZZZZ: National Emissions Standards for Hazardous Air Pollutants for Stationary
Reciprocating Internal Combustion Engines

Engineering Review N129000006: Bryce Christensen Excavating Inc.- BCE St. George Aggregate Production Plant -
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REVIEWER COMMENTS

The AO will be based on the following documents:

Supersedes DAQE-AN0129000005-08 dated December 30, 2008
Is Derived From NOI dated March 10, 2017
Incorporates Additional information dated April 17, 2017
Incorporates Additional information dated June 26, 2017
Incorporates Additional information dated July 9, 2017
Incorporates Additional information dated August 11, 2017
Incorporates Modeling Information dated December 21, 2017
Incorporates Modeling Memo dated January 17, 2018

1. Comment regarding Emission Estimates:
The emissions from the diesel-fired generator engine were estimated using AP-42 Section 3.3.
The emissions from bulldozers were estimated using AP-42 Section 11.9. The emissions from
wind erosion of exposed areas were estimated using AP-42 Section 11.9. The emissions from the
aggregate processing equipment (crushers, screens, & conveyors were estimated using AP-42
Section 11.19. The emissions from haul roads were estimated using AP-42 Section 13.2.2 and the
DAQ Haul Road Guidance. The emissions from material handling were estimated using AP-42
Section 13.2. The emissions from storage piles were estimated using the Fourth Edition of AP-42
Section 8.19.1-1. [Last updated February 16, 2018]

2. Comment regarding NSPS and MACT Requirements:
NSPS (40 CFR 60 Subpart A, Subpart OOO, and Subpart IIII) and MACT (40 CFR 63 Subpart A,
and Subpart ZZZZ) regulations apply to this source.

40 CFR Part 60 Subpart OOO applies to crushers, screening operations, and belt conveyors at
nonmetallic mineral processing plants that commenced construction after August 31, 1983. This
source has crushers, screens, and conveyors on site, and all crushers, screens, and conveyors on
site were manufactured after August 31, 1983. Therefore, NSPS Subpart OOO applies to this
source.

40 CFR 63 MACT 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 source.

NSPS Subpart IIII applies to owners and operators of stationary CI ICE that commence
construction after July 11, 2005, where the stationary CI ICE are manufactured after April 1,
2006. The diesel-fired generator engine is a CI ICE. The manufacturer date of the engine is
unknown. Because the information is unknown, the conservative approach is to assume NSPS
Subpart IIII applies. The references in this permit will list NSPS Subpart IIII as applying to this
source. [Last updated February 16, 2018]

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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.

This source is not a major source and is not a Title IV source. The source is subject to NSPS
Subpart OOO (a standard under Section 111 of the Act); therefore, Title V applies to this source.
[Last updated February 16, 2018]

4. Comment regarding Previous Permit Emission Estimates Compared to Current Emission
Estimates:
PM10 emission estimates have changed from the previous permit. The comparison of emissions
from the various sources is summarized below:

Emission Unit/Source Old Estimates New Estimates Change
Aggregate Processing 0.42 tpy 0.60 tpy + 0.18 tpy
Material Handling 0.28 tpy 0.73 tpy + 0.45 tpy
Storage Piles 1.41 tpy 5.75 tpy + 4.34 tpy
Disturbed Area 1.90 tpy 0.95 tpy - 0.95 tpy
Bulldozing 0.01 tpy 1.99 tpy + 1.98 tpy
Unpaved Roads 0.14 tpy 3.97 tpy + 3.83 tpy
Paved Roads 1.32 tpy 0.51 tpy - 0.81 tpy

[Last updated February 16, 2018]

5. Comment regarding Previous Permit Emission Estimates Compared to Current Emission
Estimates (Continued):
The reason for these changes is summarized below:
Aggregate Processing: The source is adding two crushers; therefore, emissions from the aggregate
processing are increasing. There were also some slight differences with the emission factors.

Material Handling: The new permit used four transfers instead of two. In addition, the new permit
used a moisture content of 4% and the previous permit used a moisture content of 4.8%. These
two changes resulted in an increase in emissions.

Storage Piles: The previous permit assumed 1.5 acres of storage piles and used the material
handling equation in AP-42 to estimate emissions from storage piles. This underestimated
emission by over 4 tons per year. The new permit used a storage pile size of 20 acres and used
AP-42 Fourth Edition to estimate emissions from storage piles.

Disturbed Area: The current permit used the same emission factors as the previous permit;
however, the current permit assumed that only half of the total acres were actually being
disturbed. This is because there are haul roads, storage piles, buildings, and other areas that are
not considered disturbed area. Therefore, there is a decrease in emissions.
Engineering Review N129000006: Bryce Christensen Excavating Inc.- BCE St. George Aggregate Production Plant -
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February 20, 2018
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Bulldozing: The emission factor number for bulldozing was the same in both permits; however,
the previous permit did not use the correct units. The emission factor is 1.994 pounds per hour. It
is unknown which units the previous permit used, but the current permit is correct.

Unpaved Roads: The source has changed layouts from the previous permit. The total unpaved
haul road length increased from 600 feet to over 2,550 feet. In addition, the DAQ has a guidance
on how to estimate emissions from haul roads that was not available for the previous permit;
therefore, emissions were estimated using different control efficiencies and factors. This accounts
for the increase in unpaved haul road emissions.

Paved Roads: The source has changed layouts from the previous permit. The paved haul road
length increased from 250 feet to over 1,300 feet; however, the method used to estimate paved
haul road emissions has changed since the previous permit. The DAQ has a guidance on how to
estimate emissions from haul roads that was not available for the previous permit; therefore,
emissions were estimated using different control efficiencies and factors. Because of these overall
changes, there is a decrease in emissions from the paved haul roads. [Last updated February 16,
2018]

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February 20, 2018
Page 16
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
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

EMISSIONS SUMMARY
Existing PTE Engine Removal
Screen
Removal
Crusher
Replacment
NOX 10.23 -10.23
CO 2.2 -2.20
PM10 15.24 -0.73 -0.15 0.00
PM2.5 6.67 -0.73 -0.01 0.00
VOC 0.83 -0.83
SO2 0.68 -0.68
HAP 0.01 -0.01
CO2e 380 -380
*Removing the engine will eliminate SO2 emissio
Changes:
- Removal of one engine
- Removal of one screen
- Replacment of one crusher (cone to VSI)
tpy
Change in
PTE New PTE
-10.23 0.00
-2.20 0.00
-0.87 14.37
-0.74 5.93
-0.83 0.00
-0.68 0.00
-0.01 0.00
-380 0
ons
Equipment Details
Rating 200 hp = (149.3 kw)
Operational Hours 3,300 hours/year
Sulfur Content 15 ppm or 0.0015%
Criteria Pollutant
Emission
Standards
(g/hp-hr)
Emission Factor
(lb/hp-hr)
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)Reference
NOX 0.031 6.20 10.23
CO 6.68E-03 1.34 2.20
PM10 2.20E-03 0.44 0.73
PM2.5 2.20E-03 0.44 0.73
VOC 2.51E-03 0.50 0.83
SO2 1.21E-05 0.00 0.00 AP-42 Table 3.4-1
HAP 0.01 0.01 See Below
Green House Gas Pollutant
Global
Warming
Potential
Emission Factor
(lb/hp-hr)
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)Reference
CO2 (mass basis)1 1.15 230 380
Methane (mass basis)25 0 0CO2e380
Hazardous Air Pollutant
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)Reference
Benzene 9.33E-04 1.31E-03 2.16E-03
Toluene 4.09E-04 5.73E-04 9.45E-04
Xylenes 2.85E-04 3.99E-04 6.58E-041,3-Butadiene 3.91E-05 5.47E-05 9.03E-05
Formaldehyde 1.18E-03 1.65E-03 2.73E-03
Acetaldehyde 7.67E-04 1.07E-03 1.77E-03
Acrolein 9.25E-05 1.30E-04 2.14E-04
Naphthalene 8.48E-05 1.19E-04 1.96E-04
Acenaphthylene 5.06E-06 7.08E-06 1.17E-05
Acenaphthene 1.42E-06 1.99E-06 3.28E-06
Fluorene 2.92E-05 4.09E-05 6.75E-05Phenanthrene2.94E-05 4.12E-05 6.79E-05
Anthracene 1.87E-06 2.62E-06 4.32E-06
Fluoranthene 7.61E-06 1.07E-05 1.76E-05
Pyrene 4.78E-06 6.69E-06 1.10E-05
Benz(a)anthracene 1.68E-06 2.35E-06 3.88E-06
Chrysene 3.53E-07 4.94E-07 8.15E-07
Benzo(b)fluoranthene 9.91E-08 1.39E-07 2.29E-07
Benzo(k)fluoranthene 1.55E-07 2.17E-07 3.58E-07Benzo(a)pyrene 1.88E-07 2.63E-07 4.34E-07
Indeno(1,2,3-cd)pyrene 3.75E-07 5.25E-07 8.66E-07
Dibenz(a,h)anthracene 5.83E-07 8.16E-07 1.35E-06Benzo(g,h,l)perylene 4.89E-07 6.85E-07 1.13E-06
Emission Factor
(lb/MMBtu)
AP-42 Table 3.3-2,
Table 3.4-3, &
Table 3.4-4
(1,3-Butadiene will
not popluate if the
engine size is greater
than 600 hp. AP-42
does not list 1,3-
Butadiene for engines greater than
600 hp.)
Diesel-Fired Engines
Emergency Engines should
equal 100 hours of operation
per year
Manufacturer Data,
AP-42 Table 3.3-1,
& Table 3.4-1
AP-42 Table 3.3-1
& Table 3.4-1
Page 3 of 8 Version 1.1
February 21, 2019
Production Rates
Hourly Rates 250 tons/hour
Annual Production 400,000 tons/year
Emission Unit
Number of
Emission Units
PM10 Emission
Factor
(lb/ton)
PM2.5 Emission
Factor
(lb/ton)Reference
Crushers 3 0.00054 0.00010
Screens 1 0.00074 0.00005
Conveyor Transfer Points 12 4.6E-05 1.3E-05
Pollutant
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)
PM10 0.73 0.58
PM2.5 0.13 0.10
Emission Unit
PM10 Emission
Rate
(lbs/hr)
PM10 Emission
Total
(tons/year)
PM2.5 Emission
Rate
(lbs/hr)
PM2.5 Emission
Total
(tons/year)
Crushers 0.41 0.32 0.08 0.06
Screens 0.19 0.15 0.01 0.01
Conveyors 0.14 0.11 0.04 0.03
Aggregate Processing Equipment
AP-42
Table 11.19.2-2
Page 4 of 8 Version 1.0
November 29, 2018
Bulldozer Hours of Operation
Hours operated per year 3,300 hours/year
Variables for Bulldozing Overburden
Material Silt Content 6.9 %
Material Moisture Content 7.9 %
Pollutant
Emission
Factor
(lb/hr)
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)Reference
PM10 0.75276 0.75 1.24PM2.5 0.41378 0.41 0.68
Bulldozing
AP-42 11.9
Table 11.9-1
Page 5 of 8 Version 1.0
November 29, 2018
Wind Erosion of Exposed Area
Total Area of Disturbed Ground 15 acres
Emission Factors & Distribution
TSP Emission Factor 0.38
PM10 Content 50%
PM2.5 Content 7.5%
Pollutant
Emission
Factor
(tons/acre-year)
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)
PM10 0.19 0.65 2.85
PM2.5 0.03 0.10 0.43
Disturbed Ground
Reference
AP-42 Table 11.9-4
AP-42 Section 13.2.5.3
Page 6 of 8 Version 1.1
September 4, 2019
Production Rates
Hourly Rates 250 tons/hour
Annual Production 400,000 tons/year
Loader Information
Empty Loader Weight 20 tons
Weight of Load 10 tons
Loaded Loader Weight 30 tons
Loader Route\ Information
Loader Route One-Way Length 650 feet
Hourly Vehicle Miles Traveled 6.2 miles
Annual Vehicle Miles Traveled 9,848 miles
Type of Control
Pollutant
Uncontrolled
Emission
Factor
(lb/VMT)
Controlled
Emission
Factor
(lb/VMT)
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)Reference
PM10 1.71 0.51 3.15 2.52
PM2.5 0.171 0.051 0.32 0.25
Loader Routes
Basic Watering - (70% control)
AP-42 13.2.2 & DAQ
Haul Road Guidance
Page 7 of 8 Version 1.0
November 29, 2018
Production Rates
Hourly Rates 250 tons/hour
Annual Production 400,000 tons/year
Truck Information
Empty Truck Weight 20 tons
Weight of Load 40 tons
Loaded Truck Weight 60 tons
Haul Road Information
Haul Road One-Way Length 3,312 feet
Hourly Vehicle Miles Traveled 7.8 miles
Annual Vehicle Miles Traveled 12,547 miles
Type of Control
Pollutant
Uncontrolled
Emission
Factor
(lb/VMT)
Controlled
Emission
Factor
(lb/VMT)
Emission
Rate
(lbs/hr)
Emission
Total
(tons/year)Reference
PM10 2.11 0.63 4.96 3.97
PM2.5 0.211 0.063 0.50 0.40
Haul Roads
Basic Watering - (70% control)
AP-42 13.2.2 & DAQ
Haul Road Guidance
Page 8 of 8 Version 1.0
November 29, 2018