DAQ-2024-010580

DAQE-AN120580010-24

{{$d1 }}

Lee Ware
Kilgore Companies, LLC
7057 West 2100 South
Salt Lake City, UT 84128
[e-mail]

Dear Mr. Ware:

Re: Approval Order: Administrative Amendment to Approval Order DAQE-AN0120580008-10 for a
10-Year Review and Permit Updates
Project Number: N120580010

The attached Approval Order (AO) is issued pursuant to the Division of Air Quality conducting a
10-year administrative review of this source and its respective AO. Kilgore Companies, LLC must
comply with the requirements of this AO, all applicable state requirements (R307), and Federal
Standards.

The project engineer for this action is Christine Bodell, 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:CB:jg

cc: Salt Lake County 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

August 28, 2024

STATE OF UTAH
Department of Environmental Quality
Division of Air Quality

{{#s=Sig_es_:signer1:signature}}
{{#d1=date1_es_:signer1:date:format(date, "mmmm d, yyyy")}}
{{#d2=date1_es_:signer1:date:format(date, "mmmm d, yyyy"):align(center)}}

APPROVAL ORDER
DAQE-AN120580010-24
Administrative Amendment to Approval Order
DAQE-AN0120580008-10 for a 10-Year Review
and Permit Updates

Prepared By
Christine Bodell, Engineer
[phone]
[e-mail]

Issued to
Kilgore Companies, LLC - Parleys Quarry

Issued On
{{$d2 }}

Issued By

{{$s }}

Bryce C. Bird
Director
Division of Air Quality
August 28, 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 ..................................................................................... 6
PERMIT HISTORY ..................................................................................................................... 8
ACRONYMS ................................................................................................................................. 9

DAQE-AN120580010-24
Page 3

GENERAL INFORMATION

CONTACT/LOCATION INFORMATION

Owner Name Source Name
Kilgore Companies, LLC Kilgore Companies, LLC - Parleys Quarry

Mailing Address Physical Address
7057 West 2100 South 1.25 miles up Parley's Canyon Off I-80, Exit 131
Salt Lake City, UT 84128 Salt Lake City, UT

Source Contact UTM Coordinates
Name: Lee Ware 434,670 m Easting
Phone: [phone] Ext 1412 4,508,600 m Northing
Email: [e-mail] Datum NAD83
UTM Zone 12
SIC code 1442 (Construction Sand & Gravel)

SOURCE INFORMATION
General Description
Kilgore Companies LLC (Kilgore) owns and operates an aggregate processing facility located
approximately 1.25 miles east of the mouth of Parley's Canyon in Salt Lake County. The sand and gravel
for the crushing/screening circuit are provided by dozer push-offs of material generated through blasting
and drilling on the far-east side of the site from the mountain face. Once the material has been processed,
it is trucked off-site.

NSR Classification
10-Year Review

Source Classification
Located in Northern Wasatch Front O3 NAA, Salt Lake City UT PM2.5 NAA, Salt Lake County SO2
NAA
Salt Lake County
Airs Source Size: SM

Applicable Federal Standards
NSPS (Part 60), A: General Provisions
NSPS (Part 60), OOO: Standards of Performance for Nonmetallic Mineral Processing Plants
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-AN120580010-24
Page 4

Project Description
This administrative amendment is to Approval Order DAQE-AN0120580008-10, dated June 9, 2010. The
DAQ is conducting a 10-year review and is updating the language and format of the 2010 AO. There are
no changes to the operations and/or equipment.

SUMMARY OF EMISSIONS

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

Criteria Pollutant Change (TPY) Total (TPY)
CO2 Equivalent 0 1750.00
Carbon Monoxide 0 10.06
Nitrogen Oxides 0 46.69
Particulate Matter - PM10 0 24.07
Particulate Matter - PM2.5 0 24.07
Sulfur Dioxide 0 3.09
Volatile Organic Compounds 0 1.06

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 Executive Secretary or Executive Secretary'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 five (5) years. [R307-401-8]
I.5 At all times, including periods of startup, shutdown, and malfunction, owners and operators shall, to the extent practicable, maintain and operate any equipment approved under this AO, including associated air pollution control equipment, in a manner consistent with good air pollution control practice for minimizing emissions. Determination of whether acceptable operating and maintenance procedures are being used will be based on information available to the Director which may include, but is not limited to, monitoring results, opacity observations, review of operating and maintenance procedures, and inspection of the source. All maintenance performed on equipment authorized by this AO shall be recorded. [R307-401-4]
DAQE-AN120580010-24
Page 5

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 Parley's Canyon Quarry II.A.2 Three (3) Jaw Crushers Rating: 250 tons per hour (tph), each NSPS Applicability: Subpart OOO
II.A.3 Four (4) Cone Crushers/Impactors Rating: 250 tph, each NSPS Applicability: Subpart OOO II.A.4 Five (5) Triple Deck Screens Rating: 250 tph, each NSPS Applicability: Subpart OOO
II.A.5 One (1) Screen Plant Rating: 250 tph NSPS Applicability: Subpart OOO II.A.6 Generator Sets and/or Screen Plant Engines Rating: Any combination of generator sets and/or screen plant engines with total power capacity not to exceed 600 kW. Fuel: Diesel MACT Applicability: Subpart ZZZZ
II.A.7 Associated Stackers, Conveyors, etc. The total number of transfer points shall not exceed 50. II.A.8 Associated Loaders, Dozers, Scrapers, etc. -For informational purposes only-

DAQE-AN120580010-24
Page 6

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 2,500,000 tons of processed aggregate material
per rolling 12-month period. [R307-401-8]

II.B.1.a.1 The owner/operator shall: A. Determine production by truck scale records or vendor receipts. B. Record production on a daily basis. C. Use the production records to calculate a new rolling 12-month total by the 25th day of each month using data from the previous 12 months. D. Keep production records for all periods the plant is in operation. [R307-401-8]
II.B.1.b The owner/operator shall not allow visible emissions from the following emission points to
exceed the following values:

A. All crushers - 12% opacity.

B. All screens - 7% opacity.

C. All conveyor transfer points - 7% opacity.

D. All conveyor drop points - 20% opacity.

E. All diesel-fired engines - 20% opacity.

F. All other points - 20% opacity.

[R307-401-8]

II.B.1.b.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 Requirements
II.B.2.a The owner/operator shall not allow visible emissions from haul-road traffic and mobile equipment in operational areas to exceed 20% opacity on site and 10% opacity at the property boundary. [R307-309-5, R307-401-8]
II.B.2.a.1 Visible emissions determinations for traffic sources shall use procedures similar to Method 9;
however, the requirement for observations to be made at 15-second intervals over a six-minute
period shall not apply. Six points, distributed along the length of the haul road or in the operational area, shall be chosen by the Director or the Director's representative. Visible
emissions shall be measured at a point not less than 1/2 vehicle length behind the vehicle and not
less than 1/2 the height of the vehicle. The accumulated six readings shall be averaged for the compliance value. [R307-309-5]

DAQE-AN120580010-24
Page 7

II.B.2.b The owner/operator shall comply with a fugitive dust control plan (FDCP) acceptable to the Director for control of all dust sources on site. The owner/operator shall comply with the most current fugitive dust control plan approved by the Director. [R307-309-6, R307-401-8] II.B.2.c The owner/operator shall use water application and/or chemical suppressants for all unpaved haul
roads and wheeled-vehicle operational areas to maintain opacity limits listed in this AO. The opacity shall not be exceeded except when wind speeds exceed 25 mph, as measured by a hand-held anemometer or equivalent device. If the temperature is below freezing, the
owner/operator may stop applying water and/or chemical suppressant to the unpaved haul roads and wheeled-vehicle operational areas. The owner/operator shall resume applying water and/or chemical suppressants to the unpaved haul roads and wheeled-vehicle operational areas when the
temperature is above freezing. If chemical treatment is to be used, the plan must be approved by the Director. [R307-401-8]
II.B.2.c.1 Records of chemical suppressant and water application 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. C. Temperature, if the temperature is below freezing. D. Records of wind speeds when wind speeds exceed 25 mph. This record is not required if the owner/operator does not claim the wind speed exemption from the opacity limit on fugitive dust. [R307-401-8]
II.B.2.d The owner/operator shall not exceed a haul road speed limit of 15 miles per hour. The haul road
speed shall be posted, at a minimum, on site at the beginning of the haul road so that it is clearly visible from the haul road. [R307-401-8]

II.B.2.e The owner/operator shall not have more than 0.4 miles in roundtrip length of haul roads (including paved and unpaved haul roads) on site. [R307-401-8]
II.B.2.f The owner/operator shall maintain control of disturbed or stripped areas at all times. Records of
treatment shall be kept for all periods when the plant is in operation. [R307-401-8]
II.B.2.g The owner/operator shall install water sprays or chemical dust suppression sprays on each crusher, screen, and conveyor transfer point on site to control emissions. The sprays shall operate as necessary, whenever dry conditions warrant, to prevent visible emissions from exceeding the opacity limits listed in this AO. [40 CFR 60 Subpart OOO, R307-401-8]
II.B.2.h The owner/operator shall use water application for all storage piles to minimize fugitive dust
emissions, as dry conditions warrant and the ambient temperature is above freezing, or as
determined by the Director. The water shall be applied as necessary to prevent visible emissions
from exceeding the opacity limits listed in this AO. [R307-401-8]

II.B.2.i The owner/operator shall not exceed a value of 4.8% by weight of silt content of the haul road. [R307-401-8]
II.B.2.i.1 The silt content is defined as all material passing a #200 U.S. Standard Sieve. The silt content
shall be determined if directed by the Director using the appropriate ASTM method.
[R307-401-8]

DAQE-AN120580010-24
Page 8

II.B.2.j The owner/operator shall comply with all applicable fugitive emissions and fugitive dust requirements of Rule R307-309, "Nonattainment and Maintenance Areas for PM10 and PM2.5: Fugitive Emissions and Fugitive Dust." [R307-309, R307-401-8] II.B.3 Engine Requirements
II.B.3.a The owner/operator shall not operate all diesel-fired generators for more than 3,744 hours, combined, per rolling 12-month period. [R307-401-8] II.B.3.a.1 The owner/operator shall:
A. Determine hours of operation by monitoring and maintaining an operations log.
B. Record hours of operation on a daily basis. C. Use the hours of operation records to calculate a new rolling 12-month total by
the 25th day of each month using data from the previous 12 months.
D. Keep hours of operation records for all periods the plant is in operation.
[R307-401-8]

II.B.3.b The owner/operator shall only use diesel fuel (e.g., fuel oil #1, #2, or diesel fuel oil additives) as fuel. [R307-401-8]
II.B.3.c 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. [40 CFR 63 Subpart ZZZZ, R307-401-8]

II.B.3.c.1 Sulfur content shall be decided by ASTM Methods D2880-71 or D4294-89, or approved equivalent. The sulfur content shall be tested if directed by the Director. [R307-203-1]

PERMIT HISTORY

This Approval Order shall supersede (if a modification) or will be based on the following documents: Supersedes AO DAQE-AN0120580008-10 dated June 9, 2010

DAQE-AN120580010-24
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

DAQE-

RN120580010 August 13, 2024
Lee Ware Kilgore Companies, LLC 7057 West 2100 South
Salt Lake City, UT 84128 [e-mail]
Dear Lee Ware,
Re: Engineer Review - 10-Year Review and Permit Updates:
Administrative Amendment to Approval Order DAQE-AN0120580008-10 for a 10-Year Review and Permit Updates Project Number: N120580010
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 (NSR) permitting program. Kilgore Companies, LLC should complete this review within 10 business days of receipt.
Kilgore Companies, LLC should contact Christine Bodell at [phone] if there are questions or concerns with the review of the draft permit conditions. Upon resolution of your concerns, please email Christine Bodell at [e-mail] the signed cover letter. Upon receipt of the signed cover letter,
the DAQ will prepare an Approval Order (AO) for signature by the DAQ Director.
If Kilgore Companies, LLC does not respond to this letter within 10 business days, the project will move
forward without source concurrence. If Kilgore Companies, LLC 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
08/23/2024

Engineer Review N120580010: Kilgore Companies, LLC - Parleys Quarry August 13, 2024 Page 1
UTAH DIVISION OF AIR QUALITY
ENGINEER REVIEW

SOURCE INFORMATION
Project Number N120580010 Owner Name Kilgore Companies, LLC Mailing Address 7057 West 2100 South
Salt Lake City, UT, 84128 Source Name Kilgore Companies, LLC - Parleys Quarry
Source Location 1.25 miles up Parley's Canyon Off I-80, Exit 131 Salt Lake City, UT
UTM Projection 434,670 m Easting, 4,508,600 m Northing UTM Datum NAD83 UTM Zone UTM Zone 12 SIC Code 1442 (Construction Sand & Gravel) Source Contact Lee Ware Phone Number [phone] Ext 1412 Email [e-mail] Billing Contact Lee Ware
Phone Number [phone] ext 1412 Email [e-mail]
Project Engineer Christine Bodell, Engineer Phone Number [phone] Email [e-mail]
Notice of Intent (NOI) Submitted July 16, 2024 Date of Accepted Application July 16, 2024

Engineer Review N120580010: Kilgore Companies, LLC - Parleys Quarry August 13, 2024 Page 2
SOURCE DESCRIPTION General Description
Kilgore Companies LLC (Kilgore) owns and operates an aggregate processing facility located approximately 1.25 miles east of the mouth of Parley's Canyon in Salt Lake County. The sand and gravel for the crushing/screening circuit is provided by dozer push offs of material generated
through blasting and drilling on the far-east side of the site from the mountain face. Once the material has been processed, it is trucked off-site. NSR Classification: 10 Year Review Source Classification Located in Northern Wasatch Front O3 NAA, Salt Lake City UT PM2.5 NAA, Salt Lake County SO2 NAA Salt Lake County Airs Source Size: SM
Applicable Federal Standards NSPS (Part 60), A: General Provisions
NSPS (Part 60), OOO: Standards of Performance for Nonmetallic Mineral Processing Plants 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 Administrative Amendment to Approval Order DAQE-AN0120580008-10 for a 10-Year Review and Permit Updates
Project Description This administrative amendment is to Approval Order DAQE-AN0120580008-10, dated June 9, 2010. The DAQ is conducting a 10-year review and is updating the language and format of the 2010 AO. There are no changes to the operations and/or equipment. EMISSION IMPACT ANALYSIS This is a 10-Year Review. No changes to equipment or emissions are being made at this time. Therefore, modeling is not required. [Last updated July 16, 2024]

Engineer Review N120580010: Kilgore Companies, LLC - Parleys Quarry August 13, 2024 Page 3
SUMMARY OF EMISSIONS
The emissions listed below are an estimate of the total potential emissions from the source. Some rounding of emissions is possible.
Criteria Pollutant Change (TPY) Total (TPY) CO2 Equivalent 0 1750.00 Carbon Monoxide 0 10.06
Nitrogen Oxides 0 46.69
Particulate Matter - PM10 0 24.07
Particulate Matter - PM2.5 0 24.07
Sulfur Dioxide 0 3.09
Volatile Organic Compounds 0 1.06
Note: Change in emissions indicates the difference between previous AO and proposed modification.

Engineer Review N120580010: Kilgore Companies, LLC - Parleys Quarry August 13, 2024 Page 4
Review of BACT for New/Modified Emission Units 1. BACT review regarding 10 Year Review
This is a 10-Year Review. No changes to equipment or emissions are being made at this time. Therefore, a BACT analysis is not required. [Last updated July 16, 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 Executive Secretary or Executive Secretary'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 five (5) years. [R307-401-8] I.5 At all times, including periods of startup, shutdown, and malfunction, owners and operators shall, to the extent practicable, maintain and operate any equipment approved under this AO,
including associated air pollution control equipment, in a manner consistent with good air pollution control practice for minimizing emissions. Determination of whether acceptable operating and maintenance procedures are being used will be based on information available
to the Director which may include, but is not limited to, monitoring results, opacity observations, review of operating and maintenance procedures, and inspection of the source. All maintenance performed on equipment authorized by this AO shall be recorded. [R307-
401-4] I.6 The owner/operator shall comply with UAC R307-107. General Requirements: Breakdowns. [R307-107]

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

Engineer Review N120580010: Kilgore Companies, LLC - Parleys Quarry August 13, 2024 Page 5
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 Parley's Canyon Quarry
II.A.2 Three (3) Jaw Crushers Rating: 250 tons per hour (tph), each NSPS Applicability: Subpart OOO
II.A.3 Four (4) Cone Crushers/Impactors Rating: 250 tph, each
NSPS Applicability: Subpart OOO
II.A.4 Five (5) Triple Deck Screens Rating: 250 tph, each NSPS Applicability: Subpart OOO II.A.5 One (1) Screen Plant Rating: 250 tph
NSPS Applicability: Subpart OOO
II.A.6 Generator Sets and/or Screen Plant Engines
Rating: Any combination of generator sets and/or screen plant engines with total power capacity not to exceed 600 kW. Fuel: Diesel
MACT Applicability: Subpart ZZZZ

II.A.7 Associated Stackers, Conveyors, etc. The total number of transfer points shall not exceed 50.
II.A.8 Associated Loaders, Dozers, Scrapers, etc. -For information purposes only-

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):

Engineer Review N120580010: Kilgore Companies, LLC - Parleys Quarry August 13, 2024 Page 6
II.B REQUIREMENTS AND LIMITATIONS
II.B.1
NEW
Site-wide Requirements
II.B.1.a NEW The owner/operator shall not produce more than 2,500,000 tons of processed aggregate material per rolling 12-month period. [R307-401-8] II.B.1.a.1 NEW The owner/operator shall: A. Determine production by truck scale records or vendor receipts B. Record production on a daily basis C. Use the production records to calculate a new rolling 12-month total by the
25th day of each month using data from the previous 12 months D. Keep production records for all periods the plant is in operation. [R307-401-8] II.B.1.b NEW The owner/operator shall not allow visible emissions from the following emission points to exceed the following values: A. All crushers - 12% opacity B. All screens - 7% opacity C. All conveyor transfer points - 7% opacity D. All conveyor drop points - 20% opacity
E. All diesel-fired engines - 20% opacity
F. All other points - 20% opacity
[R307-401-8]
II.B.1.b.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 NEW Roads and Fugitive Dust Requirements
II.B.2.a NEW The owner/operator shall not allow visible emissions from haul-road traffic and mobile equipment in operational areas to exceed 20% opacity on site and 10% opacity at the property boundary. [R307-309-5, R307-401-8]

Engineer Review N120580010: Kilgore Companies, LLC - Parleys Quarry August 13, 2024 Page 7
II.B.2.a.1 NEW Visible emissions determinations for traffic sources shall use procedures similar to Method 9; however, the requirement for observations to be made at 15-second intervals over a six-minute period shall not apply. Six points, distributed along the length of the haul road or in the
operational area, shall be chosen by the Director or the Director's representative. Visible emissions shall be measured at a point not less than 1/2 vehicle length behind the vehicle and not less than 1/2 the height of the vehicle. The accumulated six readings shall be averaged for
the compliance value. [R307-309-5] II.B.2.b NEW The owner/operator shall comply with a fugitive dust control plan (FDCP) acceptable to the Director for control of all dust sources on site. The owner/operator shall comply with the most current fugitive dust control plan approved by the Director. [R307-309-6, R307-401-8] II.B.2.c NEW The owner/operator shall use water application and/or chemical suppressants for all unpaved haul roads and wheeled-vehicle operational areas to maintain opacity limits listed in this AO. The opacity shall not be exceeded except when wind speeds exceed 25 mph, as measured by a hand-held anemometer or equivalent device. If the temperature is below freezing, the owner/operator may stop applying water and/or chemical suppressant to the unpaved haul roads and wheeled-vehicle operational areas. The owner/operator shall resume applying water and/or chemical suppressants to the unpaved haul roads and wheeled-vehicle operational areas when the temperature is above freezing. If chemical treatment is to be used, the plan must be
approved by the Director. [R307-401-8]
II.B.2.c.1 NEW Records of chemical suppressant and water application 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 C. Temperature, if the temperature is below freezing.
D. Records of wind speeds when wind speeds exceed 25 mph. This record
is not required if the owner/operator does not claim the wind speed exemption
from the opacity limit on fugitive dust. [R307-401-8]
II.B.2.d
NEW
The owner/operator shall not exceed a haul road speed limit of 15 miles per hour. The haul
road speed shall be posted, at a minimum, on site at the beginning of the haul road so that it is clearly visible from the haul road. [R307-401-8]
II.B.2.e NEW The owner/operator shall not have more than 0.4 miles in roundtrip length of haul roads (including paved and unpaved haul roads) on site. [R307-401-8] II.B.2.f NEW The owner/operator shall maintain control of disturbed or stripped areas at all times. Records of treatment shall be kept for all periods when the plant is in operation. [R307-401-8]

Engineer Review N120580010: Kilgore Companies, LLC - Parleys Quarry August 13, 2024 Page 8
II.B.2.g NEW The owner/operator shall install water sprays or chemical dust suppression sprays on each crusher, screen and conveyor transfer point on site to control emissions. The sprays shall operate as necessary, whenever dry conditions warrant, to prevent visible emissions from
exceeding the opacity limits listed in this AO. [40 CFR 60 Subpart OOO, R307-401-8] II.B.2.h NEW The owner/operator shall use water application for all storage piles to minimize fugitive dust emissions, as dry conditions warrant and the ambient temperature is above freezing, or as determined by the Director. The water shall be applied as necessary to prevent visible emissions from exceeding the opacity limits listed in this AO. [R307-401-8] II.B.2.i NEW The owner/operator shall not exceed a value of 4.8% by weight of silt content of the haul road. [R307-401-8]
II.B.2.i.1 NEW The silt content is defined as all material passing a #200 U.S. Standard Sieve. The silt content shall be determined if directed by the Director using the appropriate ASTM method. [R307-401-8]

II.B.2.j NEW The owner/operator shall comply with all applicable fugitive emissions and fugitive dust requirements of Rule R307-309, "Nonattainment and Maintenance Areas for PM10 and PM2.5: Fugitive Emissions and Fugitive Dust". [R307-309, R307-401-8]
II.B.3 NEW Engine Requirements
II.B.3.a NEW The owner/operator shall not operate all diesel-fired generators for more than 3,744 hours, combined, per rolling 12-month period. [R307-401-8]
II.B.3.a.1 NEW The owner/operator shall: A. Determine hours of operation by monitoring and maintaining an operations log B. Record hours of operation on a daily basis C. Use the hours of operation records to calculate a new rolling 12-month total by
the 25th day of each month using data from the previous 12 months D. Keep hours of operation records for all periods the plant is in operation. [R307-401-8] II.B.3.b NEW The owner/operator shall only use diesel fuel (e.g. fuel oil #1, #2, or diesel fuel oil additives) as fuel. [R307-401-8]

II.B.3.c NEW 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. [40 CFR 63 Subpart ZZZZ, R307-401-8]
II.B.3.c.1 NEW Sulfur content shall be decided by ASTM Methods D2880-71 or D4294-89, or approved equivalent. The sulfur content shall be tested if directed by the Director. [R307-203-1]

Engineer Review N120580010: Kilgore Companies, LLC - Parleys Quarry August 13, 2024 Page 9
PERMIT HISTORY When issued, the approval order shall supersede (if a modification) or will be based on the
following documents: Supersedes AO DAQE-AN0120580008-10 dated June 9, 2010
REVIEWER COMMENTS
1. Comment regarding 10 Year Review:
The existing AO was issued June 9, 2010. The purpose of the 2010 AO was to adjust the organization of AO DAQE-AN0120580007-08, dated January 23, 2008, so that it could be added to the DAQ's new electronic permitting database system. All equipment on site was installed prior to 2008. The source is not modifying and/or installing any new equipment. There are no changes to the emission estimates at this time except for PM2.5 and CO2e. The PTE of PM2.5 was not included in the 2009 AO. For a conservative estimate, the PTE of PM2.5 is assumed to equal the PTE of PM10 (24.07 tpy). CO2e was calculated using AP-42 Section 3.4 Large Stationary Diesel And All Stationary Dual-fuel Engines Table 3.4-1 and assuming an engine site-wide rating of 600 kW and a total maximum of 3,744 hours of operation, annually. The PTE's should be updated if the source
modifies any equipment or process. The 2010 likely includes emissions from mobile sources. Emissions from mobile sources should be excluded in the future. Additionally, the rule references have been renumbered, the equipment list is separated into another area in the 2024 AO, and the text of each rule and conditions have been modified to reflect the
current language and formatting. The 2010 AO was issued to Harper Contracting, Inc. In 2010, the owner/operator of the AO was changed to "Harper-Kilgore, LLC" (see DAQE-GN0120580009-10, issued August 19, 2010). The correct company contact and physical and mailing address have been updated accordingly. Kilgore
has also requested that the site name be changed from "Pit #16, Parley's Canyon Aggregate Facility" to "Parley's Quarry" (see DAQE-GN119810011-24, issued August 6, 2024). The crushers visible emission limit was changed from 15% opacity to 12% opacity per R307-312-4. The screens, conveyor transfer points, and concrete batch plant baghouse visible emission limits were each changed from 10% opacity to 7% opacity per R307-312-4. The visible fugitive dust opacity limit specified in the 2010 AO was rewritten to include a 10% opacity limit at the property boundary per R307-309-5. [Last updated August 12, 2024] 2. Comment regarding Federal Subpart Applicability: NSPS Subpart OOO
The Parley's Quarry is subject to 40 CFR 60, Subpart OOO (Standards of Performance for Nonmetallic Mineral Processing Plants). The provisions of OOO are applicable to fixed above ground nonmetallic mineral processing plants, including; crusher, grinding mill, screening operation,
bucket elevator, belt conveyor, bagging operation, storage bin, enclosed truck or railcar loading stations. This site operates a nonmetallic aggregate crushing and transfer processes. Therefore, NSPS Subpart OOO applies to this facility.

Engineer Review N120580010: Kilgore Companies, LLC - Parleys Quarry August 13, 2024 Page 10
MACT Subpart ZZZZ The provisions of 40 CFR 63 Subpart ZZZZ (Standards of Performance for Stationary Spark Ignition
Internal Combustion Engines) are applicable to owners/operators of stationary RICE at a major or area sources of HAP emissions. The facility includes diesel-fired emergency stationary engines. The provisions of MACT Subpart ZZZZ apply as the stationary reciprocating internal combustion engine (RICE) is at an area source of HAP emissions. The engines are not designated as nonroad and is not exempt are affected sources under this regulation. Therefore, MACT Subpart ZZZZ applies to this facility. [Last updated July 16, 2024] 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 facility is not a major source and is not a Title IV source. The facility is not subject to 40 CFR 61 (NESHAP) regulations. This facility is subject to 40 CFR 60 (NSPS) Subparts A and OOO and 40 CFR 63 (MACT) Subparts A and ZZZZ. MACT Subpart ZZZZ specifically exempt sources from the obligation to obtain a Title V permit, if the sources are not otherwise required for a Title V
permit. However, NSPS Subpart OOO does not contain this exemption. Therefore, Title V applies to this facility as an area source. There is no requirement for this source to apply for an initial 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 July 16, 2024] 4. Comment regarding Synthetic Minor (SM) Designation:
The Kilgore Parley's Quarry is currently permitted as a minor source. The major source threshold for the Northern Wasatch Front Ozone Nonattainment area is being reduced to 50 tons per year (tpy) each of nitrogen oxides (NOx) and volatile organic compounds (VOCs) due to redesignation from
moderate to serious. The current AO allows for 46.69 tpy of NOx.
Per 40 CFR 70 (Title V), a major stationary source of air pollutants, as defined in section 302 of the Act, is a source that directly emits, or has the potential to emit, 50 tpy or more in areas classified or treated as classified as "Serious". The Kilgore Parley's Quarry has the potential to exceed this value, but has taken restrictions so that the NOx emissions are below the 50 tpy threshold. Therefore, this is a Synthetic Minor Source under 40 CFR 70. [Last updated July 16, 2024]

Engineer Review N120580010: Kilgore Companies, LLC - Parleys Quarry August 13, 2024 Page 11
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

DAQE-GN0120580009-10
August 19, 2010 Jason Kilgore Harper-Kilgore, LLC PO Box 189
Magna, UT 84044 Dear Mr. Kilgore: RE: Notification of Company Name and Ownership Change for DAQE-AN0120580008-10, dated June 9, 2010 Harper-Kilgore, LLC: Parleys Canyon Aggregate Facility Project Number: N012058-0009 The Utah Division of Air Quality (DAQ) has received your request on August 5, 2010 for a name and ownership change for the holder of the above-referenced Approval Order (AO). According to your request, we have noted in our records that the holder and party responsible for complying with the terms
and conditions contained in the above-referenced AO has been changed to ‘Harper-Kilgore, LLC’. This change took effect on the date of this letter.
The charge for the review done in making this change is a flat fee plus a filing fee as authorized by the Utah Legislature. You will receive an invoice for these charges shortly. If you have any questions, please contact Chad Harris, who may be reached at [phone].
Sincerely, M. Cheryl Heying, Executive Secretary Utah Air Quality Board Timothy R. Andrus, Manager New Source Review Section
TRA:CDH:sa
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
GARY R. HERBERT Governor GREG BELL Lieutenant Governor
Department of Environmental Quality
Amanda Smith Executive Director DIVISION OF AIR QUALITY Cheryl Heying Director
Site ID
Current Listed
Company Owner Current Site Name
Revised
Company Owner Revised Name Change Site Type Address City Zip
13273
LeGrand Johnson Construction
Company
LeGrand Johnson Construction
Company- Knudson Pit Kilgore Companies, LLC Brigham Pit Minor Source 1200 East 700 South Brigham City 84302
10639
LeGrand Johnson Construction
Company
LeGrand Johnson Construction
Company- Moab Aggregate Plant Kilgore Companies, LLC Moab Pit Minor Source
5101 East Old Airport
Road
San Juan
County 84532
10331
LeGrand Johnson Construction
Company
LeGrand Johnson Construction
Company- Garden City Concrete Batch
Plant Kilgore Companies, LLC Bear Lake RMC Minor Source 230 West 200 North Garden City 84028
10019
LeGrand Johnson Construction
Company
LeGrand Johnson Construction
Company- Tremonton Concrete Batch
Plant Kilgore Companies, LLC Tremonton RMC Minor Source 6800 West 10000 North Tremonton 84337
10379 Kilgore Companies, LLC Kilgore Companies- Valley Pit Kilgore Companies, LLC Valley Pit Minor Source Point of the Mountain Bluffdale 84091
14031 Kilgore Companies, LLC
Kilgore Contracting, LLC- Stockton
Aggregate Plant Kilgore Companies, LLC Stockton Pit Minor Source 555 North Highway 36 Stockton 84071
11436 Kilgore Companies, LLC Westroc Incorporated- Highland Pit Kilgore Companies, LLC Highland Pit Minor Source 4600 West 11200 North Highland City 84060
12121 Kilgore Companies, LLC
Westroc Incorporated- Mona Aggregate
Processing Plant & Concrete Batch
Plant Kilgore Companies, LLC Mona Pit Minor Source
Approximately 2.2 miles
north of Mona on US Hwy
91 Mona 84645
15852 Kilgore Companies, LLC
Kilgore Contracting, LLC- Benjamin
Aggregate & Asphalt Plant Kilgore Companies, LLC Benjamin Quarry Minor Source 7200 South 5600 West Benjamin 84660
10569 Kilgore Companies, LLC
Kilgore Companies, LLC dba Kilgore
Contracting - West Valley Pit #10 Kilgore Companies, LLC West Valley Minor Source 6200 West 5400 South Kearns 84118
16018 Kilgore Companies, LLC
Kilgore Companies, LLC- Erda
Aggregate Pit Kilgore Companies, LLC Erda Pit Minor Source 5800 North Highway 36 Erda 84074
10055 Kilgore Companies, LLC
Kilgore Contracting, Inc.- Hyrum
Aggregate, Asphalt and Concrete Plant Kilgore Companies, LLC Hyrum Minor Source 410 North 800 East Hyrum 84319
16119 Kilgore Companies, LLC
Kilgore Companies, LLC- Ogden Hot Mix
Asphalt Plant Kilgore Companies, LLC Ogden HMA Minor Source 1729 West 1350 South Weber County 84401
14083 Kilgore Companies, LLC
Kilgore Companies, LLC - Grantsville
Sand & Gravel Pit Kilgore Companies, LLC Grantsville Pit Minor Source
5 miles south of
Grantsville Tooele County 84029
12433 Kilgore Companies, LLC
Kilgore Companies, LLC dba Altaview
Concrete - West Jordan Concrete Batch
Plant Kilgore Companies, LLC West Jordan RMC Minor Source 5800 West 9580 South West Jordan
12058 Kilgore Companies, LLC
Harper-Kilgore, LLC- Parleys Canyon
Aggregate Facility - #16 Kilgore Companies, LLC Parleys Quarry Minor Source
1.25 miles east of mouth
of Salt Lake City
13133 Kilgore Companies, LLC
Harper-Kilgore, LLC- North Salt Lake
Concrete Batch Plant Kilgore Companies, LLC North Salt Lake RMC Minor Source 1110 West 2300 North Salt Lake City 84116
14036 Altaview Concrete Harper-Kilgore, LLC- Bauer Pit Kilgore Companies, LLC Bauer Pit Minor Source
Sections 7, 8, and 9,
Range 5 West Township 4
South Tooele
10859 Altaview Concrete
Altaview Concrete - Concrete Batch
Plant w/ Batcher Vent Kilgore Companies, LLC Springville RMC Minor Source 510 West 1600 South Springville 84663
15698 Metro Ready Mix, LLC
Metro Ready Mix LLC - Talons Cove
Concrete Batch Plant Kilgore Companies, LLC Talons Cove RMC Minor Source
4103 East Spring Run
Parkway
Eagle
Mountain 84005
11981 Asphalt Materials Incorporated AMI - Bluffdale Sand Quarry Kilgore Companies, LLC Bluffdale Pit Minor Source 14700 S 1075 W Bluffdale 84065
10343 Asphalt Materials Incorporated Asphalt Materials Incorporatred Kilgore Companies, LLC West Jordan HMA Minor Source 7961 S 1300 W West Jordan 84084