DAQ-2024-009598

DAQE-AN161530001-24

{{$d1 }}

Sam Cusick
CMC Rock, LLC
897 West Baxter Drive
South Jordan, UT 84095
[e-mail]

Dear Mr. Cusick:

Re: Approval Order: New Heber City Concrete Batch Plant
Project Number: N161530001

The attached Approval Order (AO) is issued pursuant to the Notice of Intent (NOI) received on May 25,
2023. CMC Rock, LLC must comply with the requirements of this AO, all applicable state requirements
(R307), and Federal Standards.

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

Sincerely,

{{$s }}

Bryce C. Bird
Director

BCB:EH:jg

cc: Wasatch 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

July 26, 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-AN161530001-24
New Heber City Concrete Batch Plant

Prepared By
Mr. Enqiang He, Engineer
[phone]
[e-mail]

Issued to
CMC Rock, LLC - Heber City Concrete Batch Plant

Issued On
{{$d2 }}

Issued By

{{$s }}

Bryce C. Bird
Director
Division of Air Quality

July 26, 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 .................................................................................... 5
SECTION II: PERMITTED EQUIPMENT .............................................................................. 6
SECTION II: SPECIAL PROVISIONS ..................................................................................... 7
PERMIT HISTORY ................................................................................................................... 10
ACRONYMS ............................................................................................................................... 11

DAQE-AN161530001-24
Page 3

GENERAL INFORMATION

CONTACT/LOCATION INFORMATION

Owner Name Source Name
CMC Rock, LLC CMC Rock, LLC - Heber City Concrete Batch
Plant

Mailing Address Physical Address
897 West Baxter Drive 2399 South 390 West
South Jordan, UT 84095 Heber City, UT 84032

Source Contact UTM Coordinates
Name: Sam Cusick 464,351 m Easting
Phone: [phone],480,793 m Northing
Email: [e-mail] Datum NAD83
UTM Zone 12

SIC code 3273 (Ready-Mixed Concrete)

SOURCE INFORMATION
General Description
CMC Rock, LLC (CMC Rock) has proposed a new central mix concrete batch plant near Heber City in
Wasatch County. Cement and fly ash are delivered by trucks, pneumatically loaded by conveyors, and
stored in silos. Cement and fly ash are transferred to the central mixing drum along with aggregate and
sand and then mixed with water. Admixtures are also delivered by trucks and transferred by electric
pumps. The batch plant is enclosed and controlled with a dust collector. The facility includes a crusher
and screen plant to process 350,000 tons of recycled concrete per year. A diesel-fired engine provides
power to the equipment on site. The facility also operates a boiler. Annual concrete production is limited
to 250,000 cubic yards.

NSR Classification
New Minor Source

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

Applicable Federal Standards
NSPS (Part 60), A: General Provisions
NSPS (Part 60), OOO: Standards of Performance for Nonmetallic Mineral Processing Plants
NSPS (Part 60), IIII: Standards of Performance for Stationary Compression Ignition Internal
Combustion Engines
DAQE-AN161530001-24
Page 4

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

Project Description
The central mix concrete batch plant includes the following equipment:

1. Three (3) cement silos with dust collectors. Each silo has a capacity of 1,480 cubic feet (cf).
2. One (1) fly ash silo with a dust collector. The silo has a capacity of 1,480 cf.
3. Six (6) aggregate and sand bins, each rated at 2,000 cf.
4. One (1) aggregate sand conveyor rated at 360 tons per hour (tph).
5. One (1) weigh scale rated at 61 tph.
6. Four (4) cement screw conveyors.
7. One (1) cement surge hopper.
8. One (1) concrete mixer with a capacity of 6 cubic yards
9. One (1) natural gas-fired boiler rated at 6.83 MMBtu/hr, and
10. One (1) baghouse controls the batch plant enclosure.

The aggregate plant includes the following equipment:

1. One (1) concrete crusher rated at 300 tph.
2. One (1) screen rated at 300 tph.
3. Five (5) conveyors, each rated at 300 tph.
4. One (1) superstacker rated at 300 tph.
5. One (1) grizzly feeder rated at 300 tph, and
6. One (1) Tier 4 diesel-fired engine rated at 450 hp.

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 5759.00
Carbon Monoxide 13.76
Nitrogen Oxides 1.74
Particulate Matter - PM10 3.39
Particulate Matter - PM2.5 0.42
Sulfur Dioxide 0.04
Volatile Organic Compounds 5.03

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Generic HAPs (CAS #GHAPS) 220
Change (TPY) Total (TPY)
Total HAPs 0.11

DAQE-AN161530001-24
Page 5

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 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]

DAQE-AN161530001-24
Page 6

SECTION II: PERMITTED EQUIPMENT

II.A THE APPROVED EQUIPMENT

II.A.1 The Heber City Concrete Batch Plant
Aggregate and Concrete Mix Production

II.A.2 One (1) Central Mix Concrete Batch Plant
Rated at 218 cubic yards per hour (cy/hr)
The plant includes the following components:

One (1) concrete mixer, 6 cy capacity
Three (3) cement silos (1,480 cf each) with dust collectors
One (1) fly ash silo (1,480 cf capacity) with a dust collector
Six (6) aggregate and sand bins, each rated at 2,000 cf
One (1) aggregate sand conveyor rated at 360 tph
One (1) weigh scale rated at 61 tph
Four (4) cement screw conveyors
One (1) cement surge hopper

II.A.3 One (1) Baghouse
Controls the concrete batch plant enclosure

II.A.4 One (1) Aggregate Processing Plant
The plant includes the following equipment:

One (1) concrete crusher rated at 300 tph
One (1) screen rated at 300 tph
Five (5) conveyors, each rated at 300 tph
One (1) superstacker rated at 300 tph, and
One (1) grizzly feeder rated at 300 tph

All NSPS Subpart OOO equipment

II.A.5 One (1) Natural Gas-Fired Boiler
Rated at 6.83 MMBtu/hr

II.A.6 One (1) Diesel-Fired Tier 4 Engine
Rated at 450 hp
Equipped with SCR and EGR systems

NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

II.A.7 One (1) Diesel Fuel Storage Tank
Rated Capacity: 10,000 gallons

II.A.8 Mobile Equipment
Including a front-end loader and haul trucks
Listed for informational purposes only.

DAQE-AN161530001-24
Page 7

SECTION II: SPECIAL PROVISIONS

II.B REQUIREMENTS AND LIMITATIONS

II.B.1 The Heber Concrete Batch Plant shall be subject to the following:
II.B.1.a The owner/operator shall not produce more than 250,000 cubic yards of concrete per rolling
12-month period. [R307-401-8]

II.B.1.a.1 The owner/operator shall:

A. Determine production by examination of haul truck or sales records.

B. Record production on a daily basis.

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

D. Keep production records for all periods when the plant is in operation.

[R307-401-8]

II.B.1.b Unless otherwise specified in this AO, 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 concrete batch plants - 10% opacity.

F. The diesel-fired engine - 20% opacity.

G. The natural gas-fired boiler - 10% opacity.

H. The baghouse and dust collectors - 10% opacity.

I. 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 Baghouse Requirements
II.B.2.a The owner/operator shall use a baghouse or dust collectors to control emissions from the cement
silos, the fly ash silo, and the concrete batch plant enclosure. All exhaust air streams from the
silos and the concrete batch plant enclosure shall be vented to the baghouse or dust collectors
before being vented to the atmosphere. [R307-401-8]

II.B.2.b The owner/operator shall install a manometer, a magnehelic pressure gauge, or an electronic
differential pressure meter to measure the static pressure differential across the baghouse.
[R307-401-8]

DAQE-AN161530001-24
Page 8

II.B.2.b.1 The pressure gauge shall be located such that an inspector/operator can safely read the indicator
at any time. [R307-401-8]

II.B.2.b.2 The pressure gauge shall measure the static pressure differential in 1-inch water column
increments or less. [R307-401-8]

II.B.2.c The owner/operator shall maintain the static pressure differential of the baghouse in accordance
with the manufacturer's recommendations. [R307-401-8]

II.B.2.c.1 The owner/operator shall record the static pressure differentials at least once per operating day
while the baghouse is operating. [R307-401-8]

II.B.2.c.2 The owner/operator shall maintain the following records of the static pressure differentials:

A. Unit identification.

B. Manufacturer recommended static pressure differential for the unit.

C. Daily static pressure differential readings.

D. Date of reading.

[R307-401-8]

II.B.2.d At least once every 12 months, the owner/operator shall calibrate the baghouse pressure gauges
in accordance with the manufacturer's instructions or replace the pressure gauges. [R307-401-8]

II.B.2.d.1 The owner/operator shall maintain records of the pressure gauge calibrations and replacements.
[R307-401-8]

II.B.3 The Aggregate Processing Plant shall be subject to the following
II.B.3.a The owner/operator shall not produce more than 350,000 tons of aggregate per rolling 12-month
period. [R307-401-8]

II.B.3.a.1 The owner/operator shall:

A. Determine aggregate production by belt scale records, scale house records, or bucket
scale records.

B. Account for all aggregate materials produced prior to the aggregate materials leaving the
site.

C. Record production on a daily basis.

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

E. Keep production records for all periods when the plant is in operation.

[R307-401-8]

II.B.3.b The owner/operator shall install water sprays on each crusher, screen, conveyor transfer point,
and conveyor drop point on site to control emissions. Water sprays shall operate as necessary to
prevent visible emissions from exceeding the opacity limits listed in this AO. [R307-401-8]

DAQE-AN161530001-24
Page 9

II.B.3.b.1 The owner/operator shall conduct monthly inspections of each crusher, screen, and conveyor
manufactured after April 22, 2008, to check that water is flowing to discharge spray nozzles in
the wet suppression system. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.3.b.2 The owner/operator shall maintain records of wet suppression system inspections according to
40 CFR 60 Subpart OOO. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.3.c The owner/operator shall conduct an initial performance test for all crushers, screens, and
conveyor transfer points on site within 60 days after achieving the maximum production rate but
not later than 180 days after initial startup. Performance tests shall meet the limitations specified
in Table 3 to Subpart OOO. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.3.c.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, R307-401-8]

II.B.3.c.2 The owner/operator shall keep records of the initial performance test for each crusher, screen,
and conveyor for the life of the equipment. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.4 Haul Roads and Fugitive Dust Sources shall be subject to the following:
II.B.4.a The owner/operator shall pave all in-plant haul roads. [R307-401-8]

II.B.4.b The owner/operator shall not allow visible emissions from the in-plant paved haul roads and
other fugitive emission sources to exceed 20% opacity. [R307-401-8]

II.B.4.b.1 Visible emission determinations for fugitive dust emissions from haul-road traffic and mobile
equipment in operational areas shall use procedures similar to Method 9. The normal requirement
for observations to be made at 15-second intervals over a six-minute period, however, shall not
apply. Visible emissions shall be measured at the densest point of the plume but at a point not
less than 1/2 vehicle length behind the vehicle and not less than 1/2 the height of the vehicle.
[R307-205-4]

II.B.4.c The owner/ operator shall sweep and water spray the paved in-plant haul road as necessary to
maintain the listed opacity limits in this AO. [R307-401-8]

II.B.4.c.1 Records of cleaning the paved haul roads shall be made available to the Director or the Director's
representative upon request. [R307-401-8]

II.B.4.d The combined area occupied by all storage piles on site associated with aggregate processing
plant shall not exceed 2.5 acres. [R307-401-8]

II.B.4.d.1 The owner/operator shall measure the total area of the storage piles at least once every six
months and shall maintain a record of the total acres of the storage piles. Records of the total
acres of the storage piles shall contain the following:

A. Date of measurements.

B. Size of each storage pile on site.

C. Total acres of all storage piles combined.

[R307-401-8]

II.B.4.e The owner/operator shall apply water sprays on all storage piles on site to control fugitive
emissions. Sprays shall operate as required to maintain the opacity limit listed in this AO when
the temperature is above freezing. [R307-401-8]

DAQE-AN161530001-24
Page 10

II.B.5 The Natural Gas-Fired Boiler shall be subject to the following:
II.B.5.a The owner/operator shall use natural gas as fuel in the boiler. [R307-401-8]

II.B.6 The Diesel-Fired Engine shall be subject to the following:
II.B.6.a The owner/operator shall install and operate an engine that is certified to meet the following EPA
Tier 4 standards:

HC = 0.14 g/hp-hr
NOx = 0.30 g/hp-hr
PM = 0.01 g/hp-hr

[R307-401-8]

II.B.6.a.1 The owner/operator shall keep a record of the manufacturer's certification of the emission rate.
The record shall be kept for the life of the equipment. [R307-401-8]

II.B.6.b The owner/operator shall only use diesel fuel (e.g., fuel oil #1, #2, or diesel fuel oil additives) as
fuel in the engine. [R307-401-8]

II.B.6.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. [R307-401-8]

II.B.6.c.1 To demonstrate compliance with the ULSD fuel requirement, the owner/operator shall maintain
records of diesel fuel purchase invoices or obtain certification of sulfur content from the diesel
fuel supplier. The diesel fuel purchase invoices shall indicate that the diesel fuel meets the ULSD
requirements. [R307-401-8]

II.B.6.d The owner/operator shall operate and maintain the engine's SCR and EGR systems at all times
when the engine is operated in accordance with the manufacturer's instructions and/or
recommendations. [R307-401-8]

PERMIT HISTORY

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

Is Derived From NOI dated May 25, 2023
Incorporates Additional information dated December 7, 2023
Incorporates Additional information dated March 12, 2024

DAQE-AN161530001-24
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 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

Wasatch Wave
Publication Name:
Wasatch Wave
Publication URL:
www.wasatchwave.com
Publication City and State:
Heber City, UT
Publication County:
Wasatch
Notice Popular Keyword Category:
Notice Keywords:
cmc rock
Notice Authentication Number:
202406190944375007630
1761527914
Notice URL:
Back
Notice Publish Date:
Wednesday, June 19, 2024
Notice Content
NOTICE
A Notice of Intent for the following project submitted in accordance with R307-401-1, Utah Administrative Code (UAC), has been received for
consideration by the Director:
Company Name: CMC Rock, LLC
Location: CMC Rock, LLC - Heber City Concrete Batch Plant – 2399 South 390 West,
Heber City, UT
Project Description: CMC Rock, LLC has proposed a new central mix concrete batch plant near Heber City in Wasatch County. Cement and fly
ash are delivered by trucks,
pneumatically loaded by conveyors, and stored in silos. Cement and fly ash are
transferred to the central mixing drum along with aggregate and sand and then
mixed with water. Admixtures are also delivered by trucks and transferred by
electric pumps. The batch plant is enclosed and controlled with a dust collector.
The facility includes a crusher and screen plant to process 350,000 tons of
recycled concrete per year. A diesel-fired engine provides power to the
equipment on site. The facility also operates a boiler. Annual concrete production
is limited to 250,000 cubic yards.
The completed engineering evaluation and air quality impact analysis showed the proposed project meets the requirements of federal air
quality regulations and the State air quality rules. The Director intends to issue an Approval Order pending a 30-day public comment period.
The project proposal, estimate of the effect on local air quality and draft Approval Order are available for public inspection and comment at
the Utah Division of Air Quality, 195 North 1950 West, Salt Lake City, UT 84116. Written comments received by the Division at this same
address on or before July 19, 2024 will be considered in making the final decision on the approval/disapproval of the proposed project. Email
comments will also be accepted at [e-mail]. If anyone so requests to the Director in writing within 15 days of publication of this
notice, a hearing will be held in accordance with R307-401-7, UAC.
Under Section 19-1-301.5, a person who wishes to challenge a Permit Order may only raise an issue or argument during an adjudicatory
proceeding that was raised during the public comment period and was supported with sufficient information or documentation to enable the
Director to fully consider the substance and significance of the issue.
Date of Notice: June 19, 2024
Published in The Wasatch Wave June 19, 2024.
Back

DAQE-NN161530001-24

June 13, 2024

Wasatch Wave
Legal Advertising Dept.
P.O. Box 128
Heber City, UT 84032

RE: Legal Notice of Intent to Approve

This letter will confirm the authorization to publish the attached NOTICE in the Wasatch Wave (Account
Number: 895) on June 19, 2024.

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

Sincerely,

{{$s }}

Jeree Greenwood
Office Technician

Enclosure

cc: Wasatch County
cc: Mountainland Association of Governments

195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144820 • Salt Lake City, UT 84114-4820
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor

Department of
Environmental Quality

Kimberly D. Shelley
Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

DAQE-NN161530001-24
Page 2
NOTICE

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

Company Name: CMC Rock, LLC
Location: CMC Rock, LLC - Heber City Concrete Batch Plant – 2399 South 390 West,
Heber City, UT
Project Description: CMC Rock, LLC has proposed a new central mix concrete batch plant near
Heber City in Wasatch County. Cement and fly ash are delivered by trucks,
pneumatically loaded by conveyors, and stored in silos. Cement and fly ash are
transferred to the central mixing drum along with aggregate and sand and then
mixed with water. Admixtures are also delivered by trucks and transferred by
electric pumps. The batch plant is enclosed and controlled with a dust collector.
The facility includes a crusher and screen plant to process 350,000 tons of
recycled concrete per year. A diesel-fired engine provides power to the
equipment on site. The facility also operates a boiler. Annual concrete production
is limited to 250,000 cubic yards.

The completed engineering evaluation and air quality impact analysis showed the proposed project meets
the requirements of federal air quality regulations and the State air quality rules. The Director intends to
issue an Approval Order pending a 30-day public comment period. The project proposal, estimate of the
effect on local air quality and draft Approval Order are available for public inspection and comment at the
Utah Division of Air Quality, 195 North 1950 West, Salt Lake City, UT 84116. Written comments
received by the Division at this same address on or before July 19, 2024 will be considered in making the
final decision on the approval/disapproval of the proposed project. Email comments will also be accepted
at [e-mail]. If anyone so requests to the Director in writing within 15 days of publication of this
notice, a hearing will be held in accordance with
R307-401-7, UAC.

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

Date of Notice: June 19, 2024

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

DAQE-IN161530001-24

June 13, 2024

Sam Cusick
CMC Rock, LLC
897 West Baxter Drive
South Jordan, UT 84095
[e-mail]

Dear Mr. Cusick:

Re: Intent to Approve: New Heber City Concrete Batch Plant
Project Number: N161530001

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

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

Sincerely,

{{$s }}

Alan D. Humpherys, Manager
New Source Review Section

ADH:EH:jg

cc: Wasatch 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

STATE OF UTAH
Department of Environmental Quality
Division of Air Quality

INTENT TO APPROVE
DAQE-IN161530001-24
New Heber City Concrete Batch Plant

Prepared By
Mr. Enqiang He, Engineer
[phone]
[e-mail]

Issued to
CMC Rock, LLC - Heber City Concrete Batch Plant

Issued On
June 13, 2024

{{$s }}

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

TABLE OF CONTENTS

TITLE/SIGNATURE PAGE ....................................................................................................... 1
GENERAL INFORMATION ...................................................................................................... 3
CONTACT/LOCATION INFORMATION ............................................................................... 3
SOURCE INFORMATION ........................................................................................................ 3
General Description ................................................................................................................ 3
NSR Classification .................................................................................................................. 3
Source Classification .............................................................................................................. 3
Applicable Federal Standards ................................................................................................. 3
Project Description.................................................................................................................. 4
SUMMARY OF EMISSIONS .................................................................................................... 4
PUBLIC NOTICE STATEMENT............................................................................................... 5
SECTION I: GENERAL PROVISIONS .................................................................................... 5
SECTION II: PERMITTED EQUIPMENT .............................................................................. 6
SECTION II: SPECIAL PROVISIONS ..................................................................................... 7
PERMIT HISTORY ................................................................................................................... 11
ACRONYMS ............................................................................................................................... 12

DAQE-IN161530001-24
Page 3

GENERAL INFORMATION

CONTACT/LOCATION INFORMATION

Owner Name Source Name
CMC Rock, LLC CMC Rock, LLC - Heber City Concrete Batch
Plant

Mailing Address Physical Address
897 West Baxter Drive 2399 South 390 West
South Jordan, UT 84095 Heber City, UT

Source Contact UTM Coordinates
Name: Sam Cusick 464,351 m Easting
Phone: [phone],480,793 m Northing
Email: [e-mail] Datum NAD83
UTM Zone 12

SIC code 3273 (Ready-Mixed Concrete)

SOURCE INFORMATION
General Description
CMC Rock, LLC (CMC Rock) has proposed a new central mix concrete batch plant near Heber City in
Wasatch County. Cement and fly ash are delivered by trucks, pneumatically loaded by conveyors, and
stored in silos. Cement and fly ash are transferred to the central mixing drum along with aggregate and
sand and then mixed with water. Admixtures are also delivered by trucks and transferred by electric
pumps. The batch plant is enclosed and controlled with a dust collector. The facility includes a crusher
and screen plant to process 350,000 tons of recycled concrete per year. A diesel-fired engine provides
power to the equipment on site. The facility also operates a boiler. Annual concrete production is limited
to 250,000 cubic yards.
NSR Classification
New Minor Source

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

Applicable Federal Standards
NSPS (Part 60), A: General Provisions
NSPS (Part 60), OOO: Standards of Performance for Nonmetallic Mineral Processing Plants
NSPS (Part 60), IIII: Standards of Performance for Stationary Compression Ignition Internal
Combustion Engines
MACT (Part 63), A: General Provisions
DAQE-IN161530001-24
Page 4

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

Project Description
The central mix concrete batch plant includes the following equipment:

1. Three (3) cement silos with dust collectors. Each silo has a capacity of 1,480 cubic feet (cf).
2. One (1) fly ash silo with a dust collector. The silo has a capacity of 1,480 cf.
3. Six (6) aggregate and sand bins, each rated at 2,000 cf.
4. One (1) aggregate sand conveyor rated at 360 tons per hour (tph).
5. One (1) weigh scale rated at 61 tph.
6. Four (4) cement screw conveyors.
7. One (1) cement surge hopper.
8. One (1) concrete mixer with a capacity of 6 cubic yards.
9. One (1) natural gas-fired boiler rated at 6.83 MMBtu/hr, and
10. One (1) baghouse controls the batch plant enclosure.

The aggregate plant includes the following equipment:

1. One (1) concrete crusher rated at 300 tph.
2. One (1) screen rated at 300 tph.
3. Five (5) conveyors, each rated at 300 tph.
4. One (1) superstacker rated at 300 tph.
5. One (1) grizzly feeder rated at 300 tph, and
6. One (1) Tier 4 diesel-fired engine rated at 450 hp.

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 5759.00
Carbon Monoxide 13.76
Nitrogen Oxides 1.74
Particulate Matter - PM10 3.39
Particulate Matter - PM2.5 0.42
Sulfur Dioxide 0.04
Volatile Organic Compounds 5.03

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Generic HAPs (CAS #GHAPS) 220
Change (TPY) Total (TPY)
Total HAPs 0.11

DAQE-IN161530001-24
Page 5

PUBLIC NOTICE STATEMENT

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

A 30-day public comment period will be held in accordance with UAC R307-401-7. A notification of the
intent to approve will be published in the Wasatch Wave on June 19, 2024. During the public comment
period the proposal and the evaluation of its impact on air quality will be available for the public to
review and provide comment. If anyone so requests a public hearing within 15 days of publication, it will
be held in accordance with UAC R307-401-7. The hearing will be held as close as practicable to the
location of the source. Any comments received during the public comment period and the hearing will be
evaluated. The proposed conditions of the AO may be changed as a result of the comments received.

SECTION I: GENERAL PROVISIONS

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

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

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]

DAQE-IN161530001-24
Page 6

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

SECTION II: PERMITTED EQUIPMENT

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

II.A THE APPROVED EQUIPMENT

II.A.1 The Heber City Concrete Batch Plant
Aggregate and Concrete Mix Production
II.A.2 One (1) Central Mix Concrete Batch Plant

Rated at 218 cubic yards per hour (cy/hr),
The plant includes the following components:

One (1) concrete mixer, 6 cy capacity
Three (3) cement silos (1,480 cf each) with dust collectors
One (1) fly ash silo (1,480 cf capacity) with a dust collector
Six (6) aggregate and sand bins, each rated at 2,000 cf
One (1) aggregate sand conveyor rated at 360 tons per hour (tph)
One (1) weigh scale rated at 61 tph
Four (4) cement screw conveyors
One (1) cement surge hopper

II.A.3 One (1) Baghouse
Controls the concrete batch plant enclosure

II.A.4 One (1) Aggregate Processing Plant

The plant includes the following equipment:

One (1) concrete crusher rated at 300 tph
One (1) screen rated at 300 tph
Five (5) conveyors, each rated at 300 tph
One (1) superstacker rated at 300 tph, and
One (1) grizzly feeder rated at 300 tph

All NSPS Subpart OOO equipment

II.A.5 One (1) Natural Gas-Fired Boiler
Rated at 6.83 MMBtu/hr

DAQE-IN161530001-24
Page 7

II.A.6 One (1) Diesel-Fired Tier 4 Engine
Rated at 450 hp
Equipped with SCR and EGR systems

NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

II.A.7 One (1) Diesel Fuel Storage Tank
Rated Capacity: 10,000 gallons

II.A.8 Mobile Equipment
Including a front-end loader and haul trucks
Listed for informational 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.

II.B REQUIREMENTS AND LIMITATIONS

II.B.1 The Heber Concrete Batch Plant shall be subject to the following:
II.B.1.a The owner/operator shall not produce more than 250,000 cubic yards of concrete per rolling
12-month period. [R307-401-8]

II.B.1.a.1 The owner/operator shall:

A. Determine production by examination of haul truck or sales records.

B. Record production on a daily basis.

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

D. Keep production records for all periods when the plant is in operation.

[R307-401-8]

DAQE-IN161530001-24
Page 8

II.B.1.b Unless otherwise specified in this AO, 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 concrete batch plants - 10% opacity .

F. The diesel-fired engine - 20% opacity.

G. The natural gas-fired boiler - 10% opacity.

H. The baghouse and dust collectors - 10% opacity.

I. 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 Baghouse Requirements
II.B.2.a The owner/operator shall use a baghouse or dust collectors to control emissions from the cement
silos, the fly ash silo, and the concrete batch plant enclosure. All exhaust air streams from the
silos and the concrete batch plant enclosure shall be vented to the baghouse or dust collectors
before being vented to the atmosphere. [R307-401-8]

II.B.2.b The owner/operator shall install a manometer, a magnehelic pressure gauge, or an electronic
differential pressure meter to measure the static pressure differential across the baghouse.
[R307-401-8]

II.B.2.b.1 The pressure gauge shall be located such that an inspector/operator can safely read the indicator
at any time. [R307-401-8]

II.B.2.b.2 The pressure gauge shall measure the static pressure differential in 1-inch water column
increments or less. [R307-401-8]

II.B.2.c The owner/operator shall maintain the static pressure differential of the baghouse in accordance
with the manufacturer's recommendations. [R307-401-8]

II.B.2.c.1 The owner/operator shall record the static pressure differentials at least once per operating day
while the baghouse is operating. [R307-401-8]

DAQE-IN161530001-24
Page 9

II.B.2.c.2 The owner/operator shall maintain the following records of the static pressure differentials:

A. Unit identification.

B. Manufacturer recommended a static pressure differential for the unit.

C. Daily static pressure differential readings.

D. Date of reading.

[R307-401-8]

II.B.2.d At least once every 12 months, the owner/operator shall calibrate the baghouse pressure gauges
in accordance with the manufacturer's instructions or replace the pressure gauges. [R307-401-8]

II.B.2.d.1 The owner/operator shall maintain records of the pressure gauge calibrations and replacements.
[R307-401-8]

II.B.3 The Aggregate Processing Plant shall be subject to the following:
II.B.3.a The owner/operator shall not produce more than 350,000 tons of aggregate per rolling 12-month
period. [R307-401-8]

II.B.3.a.1 The owner/operator shall:

A. Determine aggregate production by belt scale records, scale house records, or
bucket scale records.

B. Account for all aggregate materials produced prior to the aggregate materials
leaving the site.

C. Record production on a daily basis.

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

E. Keep production records for all periods when the plant is in operation.

[R307-401-8]

II.B.3.b The owner/operator shall install water sprays on each crusher, screen, conveyor transfer point,
and conveyor drop point on site to control emissions. Water sprays shall operate as necessary to
prevent visible emissions from exceeding the opacity limits listed in this AO. [R307-401-8]

II.B.3.b.1 The owner/operator shall conduct monthly inspections of each crusher, screen, and conveyor
manufactured after April 22, 2008, to check that water is flowing to discharge spray nozzles in
the wet suppression system. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.3.b.2 The owner/operator shall maintain records of wet suppression system inspections according to 40
CFR 60 Subpart OOO. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.3.c The owner/operator shall conduct an initial performance test for all crushers, screens, and
conveyor transfer points on site within 60 days after achieving the maximum production rate but
not later than 180 days after initial startup. Performance tests shall meet the limitations specified
in Table 3 to Subpart OOO. [40 CFR 60 Subpart OOO, R307-401-8]

DAQE-IN161530001-24
Page 10

II.B.3.c.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, R307-401-8]

II.B.3.c.2 The owner/operator shall keep records of the initial performance test for each crusher, screen,
and conveyor for the life of the equipment. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.4 Haul Roads and Fugitive Dust Sources shall be subject to the following:
II.B.4.a The owner/operator shall pave all in-plant haul roads. [R307-401-8]

II.B.4.b The owner/operator shall not allow visible emissions from the in-plant paved haul roads and
other fugitive emission sources to exceed 20% opacity. [R307-401-8]

II.B.4.b.1 Visible emission determinations for fugitive dust emissions from haul-road traffic and mobile
equipment in operational areas shall use procedures similar to Method 9. The normal requirement
for observations to be made at 15-second intervals over a six-minute period, however, shall not
apply. Visible emissions shall be measured at the densest point of the plume but at a point not
less than 1/2 vehicle length behind the vehicle and not less than 1/2 the height of the vehicle.
[R307-205-4]

II.B.4.c The owner/ operator shall sweep and water spray the paved in-plant haul road as necessary to
maintain the listed opacity limits in this AO. [R307-401-8]

II.B.4.c.1 Records of cleaning the paved haul roads shall be made available to the Director or the Director's
representative upon request. [R307-401-8]

II.B.4.d The combined area occupied by all storage piles on site associated with aggregate processing
plant shall not exceed 2.5 acres. [R307-401-8]

II.B.4.d.1 The owner/operator shall measure the total area of the storage piles at least once every six (6)
months and shall maintain a record of the total acres of the storage piles. Records of the total
acres of the storage piles shall contain the following:

A. Date of measurements.

B. Size of each storage pile on site.

C. Total acres of all storage piles combined.

[R307-401-8]

II.B.4.e The owner/operator shall apply water sprays on all storage piles on site to control fugitive
emissions. Sprays shall operate as required to maintain the opacity limit listed in this AO when
the temperature is above freezing. [R307-401-8]

II.B.5 The Natural Gas-Fired Boiler shall be subject to the following:
II.B.5.a The owner/operator shall use natural gas as fuel in the boiler. [R307-401-8]

DAQE-IN161530001-24
Page 11

II.B.6 The Diesel-Fired Engine shall be subject to the following:
II.B.6.a The owner/operator shall install and operate an engine that is certified to meet the following EPA
Tier 4 standards:

HC = 0.14 g/hp-hr
NOx = 0.30 g/hp-hr
PM = 0.01 g/hp-hr

[R307-401-8]

II.B.6.a.1 The owner/operator shall keep a record of the manufacturer's certification of the emission rate.
The record shall be kept for the life of the equipment. [R307-401-8]

II.B.6.b The owner/operator shall only use diesel fuel (e.g., fuel oil #1, #2, or diesel fuel oil additives) as
fuel in the engine. [R307-401-8]

II.B.6.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. [R307-401-8]

II.B.6.c.1 To demonstrate compliance with the ULSD fuel requirement, the owner/operator shall maintain
records of diesel fuel purchase invoices or obtain certification of sulfur content from the diesel
fuel supplier. The diesel fuel purchase invoices shall indicate that the diesel fuel meets the ULSD
requirements. [R307-401-8]

II.B.6.d The owner/operator shall operate and maintain the engine's SCR and EGR systems at all times
when the engine is operated in accordance with the manufacturer's instructions and/or
recommendations. [R307-401-8]

PERMIT HISTORY

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

Is Derived From NOI dated May 25, 2023
Incorporates Additional information dated December 7, 2023
Incorporates Additional information dated March 12, 2024

DAQE-IN161530001-24
Page 12

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-

RN161530001
April 1, 2024

Sam Cusick
CMC Rock, LLC
897 West Baxter Dr.
South Jordan, UT 84095
[e-mail]

Dear Sam Cusick,

Re: Engineer Review:
The Heber City Concrete Batch Plant
Project Number: N161530001

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

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

If CMC Rock, LLC does not respond to this letter within 10 business days, the project will move forward
without source concurrence. If CMC Rock, 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

Engineer Review N161530001: CMC Rock, LLC - Heber City Concrete Batch Plant
April 1, 2024
Page 1
UTAH DIVISION OF AIR QUALITY
ENGINEER REVIEW

SOURCE INFORMATION

Project Number N161530001
Owner Name CMC Rock, LLC
Mailing Address 897 West Baxter Dr.
South Jordan, UT 84095

Source Name CMC Rock, LLC - Heber City Concrete Batch Plant
Source Location 2399 South 390 West
Heber City, UT

UTM Projection 464,351 m Easting, 4,480,793 m Northing
UTM Datum NAD83
UTM Zone UTM Zone 12
SIC Code 3273 (Ready-Mixed Concrete)

Source Contact Sam Cusick
Phone Number [phone]
Email [e-mail]

Billing Contact Sam Cusick
Phone Number [phone]
Email [e-mail]

Project Engineer Mr. Enqiang He, Engineer
Phone Number [phone]
Email [e-mail]

Notice of Intent (NOI) Submitted May 25, 2023
Date of Accepted Application March 14, 2024

Engineer Review N161530001: CMC Rock, LLC - Heber City Concrete Batch Plant
April 1, 2024
Page 2
SOURCE DESCRIPTION

General Description
CMC Rock, Inc. (CMC Rock) has proposed a new central mix concrete batch plant near Heber
City in Wasatch County. Cement and fly ash are delivered by trucks, pneumatically loaded by
conveyors and stored in silos. Cement and fly ash are transferred to the central mix drum along
with aggregate and sand and then mixed with water. Admixtures are also delivered by trucks and
transferred by electric Pumps. The batch plant is enclosed and controlled with a dust collector.
The facility includes a crusher and screen plant to process 350,000 tons of recycled concrete per
year. A diesel-fired engine provides power to the equipment on site. The facility also operates a
boiler. Annual concrete production is limited to 250,000 cubic yards.

NSR Classification:
New Minor Source

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

Applicable Federal Standards
NSPS (Part 60), A: General Provisions
NSPS (Part 60), OOO: Standards of Performance for Nonmetallic Mineral Processing Plants
NSPS (Part 60), IIII: Standards of Performance for Stationary Compression Ignition Internal
Combustion Engines
MACT (Part 63), A: General Provisions
MACT (Part 63), ZZZZ: National Emissions Standards for Hazardous Air Pollutants for
Stationary Reciprocating Internal Combustion Engines

Project Proposal
The Heber City Concrete Batch Plant

Project Description
The central mix concrete batch plant includes the following equipment:
1. Three (3) cement silos with dust collectors. Each silo has a capacity of 1,480 cubic feet (cf).
2. One (1) fly ash silo with a dust collector. The silo has a capacity of 1,480 cf.
3. Six (6) aggregate and sand bins each rated at 2,000 cf.
4. One (1) aggregate sand conveyor rated at 360 tons per hour (tph).
5. One (1) weigh scale rated at 61 tph.
6. Four (4) cement screw conveyors.
7. One (1) cement surge hopper.
8. One (1) concrete mixer with a capacity of 6 cubic yards
9. One (1) natural gas-fired boiler rated at 6.83 MMBtu/hr, and
10. One (1) baghouse controls the batch plant enclosure.

The aggregate plant includes the following equipment:
1. One (1) concrete crusher rated at 300 tph.
2. One (1) screen rated at 300 tph.
3. Five (5) conveyors each rated at 300 tph.
4. One (1) superstacker rated at 300 tph.

Engineer Review N161530001: CMC Rock, LLC - Heber City Concrete Batch Plant
April 1, 2024
Page 3
5. One (1) grizzly feeder rated at 300 tph, and
6. One (1) Tier 4 Diesel-fired engine rated at 450 hp.

EMISSION IMPACT ANALYSIS
Emission increases for the criteria pollutants and HAPs are below the modeling thresholds per R307-410-4 and
R307-410-5; therefore, modeling is not required. [Last updated February 26, 2024]

Engineer Review N161530001: CMC Rock, LLC - Heber City Concrete Batch Plant
April 1, 2024
Page 4
SUMMARY OF EMISSIONS

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

Criteria Pollutant Change (TPY) Total (TPY)
CO2 Equivalent 5759.00
Carbon Monoxide 13.76
Nitrogen Oxides 1.74
Particulate Matter - PM10 3.39
Particulate Matter - PM2.5 0.42
Sulfur Dioxide 0.04
Volatile Organic Compounds 5.03

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Generic HAPs (CAS #GHAPS) 220
Change (TPY) Total (TPY)
Total HAPs 0.11

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

Engineer Review N161530001: CMC Rock, LLC - Heber City Concrete Batch Plant
April 1, 2024
Page 5
Review of BACT for New/Modified Emission Units

1. BACT review regarding the concrete batch plant
The three (3) cement silos and one (1) fly ash are controlled with dust collectors. The aggregate
bins, cement surge hoppers, conveyors, weigh scale and the concrete mixer are enclosed and
controlled with a baghouse. The dust collectors and baghouse will have control efficiencies over
99% for particulate emissions. Visible emissions from the control equipment are limited to 10%
opacity. The Minor NSR Section recommend the controls and opacity limit as BACT. [Last
updated September 14, 2023]

2. BACT review regarding Aggregate Plant Operations
The crushing, screening, and conveying of aggregate materials creates PM10 and PM2.5 emission. Potential controls for these emissions include electrostatic precipitators (ESPs), wet scrubbers,
cyclones, baghouses, enclosures, and water sprays. Due to the cost of the control and frequent
changes in plant setup, the following control technologies are economically and/or technologically
infeasible and were eliminated as BACT: ESPs, wet scrubbers, cyclones, enclosures, and
baghouses. The remaining control option is water sprays.

Water sprays are an effective control for PM emissions from crushing and screening operations as
well as transfer and drop points. BACT requirements for material processing is the use of water
sprays to meet the following opacity limitations applicable to process equipment:
Crushers - 12%
Screens - 7%
Conveyor Transfer Points - 7%
Conveyor Drop Points - 20%

[Last updated September 14, 2023]

3. BACT review regarding fugitive dust sources
Haul Roads
PM10 and PM2.5 are emitted as fugitive dust from haul roads. Controls for these emissions include
paving with vacuum sweeping (95%), paving with sweeping and watering (90%), chemical
suppressants with watering (85%), and watering (70-75%). The most effective control for haul
roads is paving combined with vacuum sweeping and watering on a regular basis. The source shall
pave the haul roads and water spray and/or sweep the roads. Visible emissions from the paved
haul roads are limited to 20% opacity. The Minor NSR Section recommends the control methods
and opacity limit as BACT.

Storage Piles
Water sprays are an effective technology to control fugitive dust emissions from storage piles.
Visible emissions from the storage piles are limited to 20% opacity. Minor NSR Section considers
water sprays and the opacity limit as BACT.

[Last updated February 26, 2024]

4. BACT review regarding 450-hp diesel-fired engine
The engine provides mechanical power to the crusher and a generator. The engine is an EPA Tier
4 certified, and equipped with Exhaust Gas Recirculation (EGR) and Selective Catalytic Reduction
(SCR). The Tier 4 emission standards for the engine are: HC = 0.14 g/hp-hr, NOx = 0.30 g/hp-hr,
and PM = 0.01 g/hp-hr. The engine will also fire with ultra-low sulfur diesel fuel. Visible

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emissions from the engine will be limited to 20% opacity. The Minor NSR Section considers the
measures and the limits as BACT. [Last updated September 14, 2023]

5. BACT review regarding the boiler
The boiler is natural gas fired and rated at 6.83 MMBtu/hr. The boiler is a turbomatic heating
system specially designed for concrete batch plant applications. The flue gas exhausts through the
filled aggregate bins to heat the aggregate. According to the manufacturer, the use of natural gas,
back pressure and absorption of the filled materials in the storage bins, will reduce NOx emissions
to 0.43 tpy with NOx concentration close to ultra-low NOx level at 12 ppm. Because of the already
low level of NOx emissions, it is technologically infeasible and economically infeasible to reduce
NOx emissions further by retrofitting the boiler. Visible emissions from the system will be limited
to 10% opacity. The Minor NSR Section considers the turbomatic heating system and the opacity
limit as BACT. [Last updated February 26, 2024]

SECTION I: GENERAL PROVISIONS

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

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

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

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

I.4 All records referenced in this AO or in other applicable rules, which are required to be kept by
the owner/operator, shall be made available to the Director or Director's representative upon
request, and the records shall include the two-year period prior to the date of the request.
Unless otherwise specified in this AO or in other applicable state and federal rules, records
shall be kept for a minimum of two (2) years. [R307-401-8]

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

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

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

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

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

II.A THE APPROVED EQUIPMENT

II.A.1 The Heber City Concrete Batch Plant
Aggregate and Concrete Mix Production

II.A.2
NEW
One (1) Central Mix Concrete Batch Plant
Rated at 218 cubic yards per hour (cy/hr)
The plant includes the following components:
One (1) concrete mixer, 6 cy capacity
Three (3) cement silos (1,480 cf each) with dust collectors
One (1) fly ash silo (1,480 cf capacity) with a dust collector
Six (6) aggregate and sand bins each rated at 2,000 cf
One (1) aggregate sand conveyor rated at 360 tons per hour (tph)
One (1) weigh scale rated at 61 tph
Four (4) cement screw conveyors
One (1) cement surge hopper

II.A.3
NEW
One (1) Baghouse
Controls the concrete batch plant enclosure

II.A.4
NEW
One (1) Aggregate Processing Plant
The plant includes the following equipment:
One (1) concrete crusher rated at 300 tph
One (1) screen rated at 300 tph
Five (5) conveyors each rated at 300 tph
One (1) superstacker rated at 300 tph, and
One (1) grizzly feeder rated at 300 tph

All NSPS Subpart OOO equipment

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II.A.5
NEW
One (1) Natural Gas-Fired Boiler
Rated at 6.83 MMBtu/hr

II.A.6
NEW
One (1) Tier 4 Engine
Rated at 450 hp and equipped with SCR and EGR systems

NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

II.A.7
NEW
Mobile Equipment
Including a front-end loader and haul trucks

II.A.8
NEW
One (1) Diesel Fuel Storage Tank
Rated Capacity: 10,000 gallons

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

II.B REQUIREMENTS AND LIMITATIONS

II.B.1
NEW
The Heber Concrete Batch Plant shall be subject to the following:
II.B.1.a
NEW
The owner/operator shall not produce more than 250,000 cubic yards of concrete per rolling
12-month period. [R307-401-8]

II.B.1.a.1
NEW
The owner/operator shall:

A. Determine production by examination of haul truck records

B. Record production on a daily basis

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

D. Keep production records for all periods when the plant is in operation

[R307-401-8]

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II.B.1.b
NEW
Unless otherwise specified in this AO, 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 concrete batch plants - 10% opacity

F. The diesel-fired engine - 20% opacity

G. The natural gas-fired boiler - 10% opacity

H. The baghouse and dust collectors - 10% opacity

I. 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
Baghouse Requirements
II.B.2.a
NEW
The owner/operator shall use a baghouse or dust collectors to control emissions from the
cement silos, the fly ash silo, and the concrete batch plant enclosure. All exhaust air streams
from the silos and the concrete batch plant enclosure shall be vented to the baghouse or dust
collectors before being vented to the atmosphere. [R307-401-8]

II.B.2.b
NEW
The owner/operator shall install a manometer, a magnehelic pressure gauge, or an electronic
differential pressure meter to measure the static pressure differential across the baghouse.
[R307-401-8]

II.B.2.b.1
NEW
The pressure gauge shall be located such that an inspector/operator can safely read the
indicator at any time. [R307-401-8]

II.B.2.b.2
NEW
The pressure gauge shall measure the static pressure differential in 1-inch water column
increments or less. [R307-401-8]

II.B.2.c
NEW
The owner/operator shall maintain the static pressure differential of the baghouse in
accordance with the manufacturer's recommendations. [R307-401-8]

II.B.2.c.1
NEW
The owner/operator shall record the static pressure differentials at least once per operating day
while the baghouse is operating. [R307-401-8]

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II.B.2.c.2
NEW
The owner/operator shall maintain the following records of the static pressure differentials:

A. Unit identification

B. Manufacturer recommended static pressure differential for the unit (if applicable)

C. Daily static pressure differential readings

D. Date of reading.

[R307-401-8]

II.B.2.d
NEW
At least once every 12 months, the owner/operator shall calibrate the baghouse pressure
gauges in accordance with the manufacturer's instructions or replace the pressure gauges.
[R307-401-8]

II.B.2.d.1
NEW
The owner/operator shall maintain records of the pressure gauge calibrations and
replacements. [R307-401-8]

II.B.3
NEW
The Aggregate Processing Plant shall be subject to the following
II.B.3.a
NEW
The owner/operator shall not produce more than 350,000 tons of aggregate per rolling 12-
month period. [R307-401-8]

II.B.3.a.1
NEW
The owner/operator shall:

A. Determine aggregate production by belt scale records, scale house records, or bucket
scale records

B. Account for all aggregate materials produced prior to the aggregate materials leaving
the site

C. Record production on a daily basis

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

E. Keep production records for all periods when the plant is in operation.

[R307-401-8]

II.B.3.b
NEW
The owner/operator shall install water sprays on each crusher, screen, conveyor transfer point,
and conveyor drop point on site to control emissions. Water sprays shall operate as necessary
to prevent visible emissions from exceeding the opacity limits listed in this AO. [R307-401-8]

II.B.3.b.1
NEW
The owner/operator shall conduct monthly inspections of each crusher, screen, and conveyor
manufactured after April 22, 2008, to check that water is flowing to discharge spray nozzles in
the wet suppression system. [40 CFR 60 Subpart OOO, R307-401-8]

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II.B.3.b.2
NEW
The owner/operator shall maintain records of wet suppression system inspections according to
40 CFR 60 Subpart OOO. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.3.c
NEW
The owner/operator shall conduct an initial performance test for all crushers, screens, and
conveyor transfer points on site within 60 days after achieving the maximum production rate
but not later than 180 days after initial startup. Performance tests shall meet the limitations
specified in Table 3 to Subpart OOO. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.3.c.1
NEW
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, R307-401-8]

II.B.3.c.2
NEW
The owner/operator shall keep records of the initial performance test for each crusher, screen,
and conveyor for the life of the equipment. [40 CFR 60 Subpart OOO, R307-401-8]

II.B.4
NEW
Haul Roads and Fugitive Dust Sources shall be subject to the following:
II.B.4.a
NEW
The owner/operator shall pave all in-plant haul roads. The total paved haul roads shall not be
less than 0.35 miles. [R307-401-8]

II.B.4.a.1
NEW
Compliance shall be determined through Global Positioning System (GPS) measurements or
aerial photographs. [R307-401-8]

II.B.4.b
NEW
The owner/operator shall not allow visible emissions from the in-plant paved haul roads and
other fugitive emission sources to exceed 20% opacity. [R307-401-8]

II.B.4.b.1
NEW
Visible emission determinations for fugitive dust emissions from haul-road traffic and mobile
equipment in operational areas shall use procedures similar to Method 9. The normal
requirement for observations to be made at 15-second intervals over a six-minute period,
however, shall not apply. Visible emissions shall be measured at the densest point of the
plume but at a point not less than 1/2 vehicle length behind the vehicle and not less than 1/2
the height of the vehicle. [R307-205-4]

II.B.4.c
NEW
The owner/ operator shall sweep and water spray the paved in-plant haul road as necessary to
maintain the listed opacity limits in this AO. [R307-401-8]

II.B.4.c.1
NEW
Records of cleaning the paved haul roads shall be made available to the Director or the
Director's representative upon request. [R307-401-8]

II.B.4.d
NEW
The combined area occupied by all storage piles on site associated with aggregate processing
plant shall not exceed 2.5 acres. [R307-401-8]

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II.B.4.d.1
NEW
The owner/operator shall measure the total area of the storage piles at least once every six
months and shall maintain a record of the total acres of the storage piles. Records of the total
acres of the storage piles shall contain the following:

A. Date of measurements

B. Size of each storage pile on site

C. Total acres of all storage piles combined.

[R307-401-8]

II.B.4.e
NEW
The owner/operator shall apply water sprays on all storage piles on site to control fugitive
emissions. Sprays shall operate as required to maintain the opacity limit listed in this AO
when the temperature is above freezing. [R307-401-8]

II.B.5
NEW
The Natural Gas-Fired Boiler shall be subject to the following:
II.B.5.a
NEW
The owner/operator shall use natural gas as fuel in the boiler. [R307-401-8]

II.B.6
NEW
The Diesel-Fired Engine shall be subject to the following
II.B.6.a
NEW
The owner/operator shall install and operate an engine that is certified to meet the following
EPA Tier 4 standards:

HC = 0.14 g/hp-hr
NOx = 0.30 g/hp-hr
PM = 0.01 g/hp-hr.

[R307-401-8]

II.B.6.a.1
NEW
The owner/operator shall keep a record of the manufacturer's certification of the emission rate.
The record shall be kept for the life of the equipment. [R307-401-8]

II.B.6.b
NEW
The owner/operator shall only use diesel fuel (e.g. fuel oil #1, #2, or diesel fuel oil additives)
as fuel in the engine. [R307-401-8]

II.B.6.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. [R307-401-8]

II.B.6.c.1
NEW
To demonstrate compliance with the ULSD fuel requirement, the owner/operator shall
maintain records of diesel fuel purchase invoices or obtain certification of sulfur content from
the diesel fuel supplier. The diesel fuel purchase invoices shall indicate that the diesel fuel
meets the ULSD requirements. [R307-401-8]

II.B.6.d
NEW
The owner/operator shall operate and maintain the engine’s SCR and EGR systems at all times
when the engine is operated in accordance with the manufacturer’s instructions and/or
recommendations. [R307-401-8]

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PERMIT HISTORY

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

Is Derived From NOI dated May 25, 2023
Incorporates Additional information dated December 7, 2023
Incorporates Additional information dated March 12, 2024

REVIEWER COMMENTS

1. Comment regarding Emission calculations:
Emission calculations are partially based on the following site-wide production limits:

Annual aggregate processing limit: 350,000 tons
Annual concrete mix production: 250,000 cubic yards
The engine and the boiler are operated at 8,760 hours per year
Paved haul road length of 0.35 miles
Total storage piles of 2.5 acres

Emissions from the concrete batch plant are calculated using AP-42, Chapter 11.12 emission factors.
Emissions from aggregate processing operations are estimated using AP-42, Chapter 11.19 emission
factors
Emissions from the storage piles are calculated using AP-42, Chapter 8.19.1 emission factors
Emissions from the boiler are based on the emission factors in AP-42, Chapter 1.4.
Engine emissions are calculated using EPA Tier 4 standards for VOC, NOx, CO, and PM10/PM2.5,
South Coast AQMD emission factors for SO2, and an annual operation of 8,760 hours.
Paved haul road emissions are calculated using the DAQ Haul Road Guidance and parameters in
AP-42, Chapter 13.2.2.

[Last updated February 26, 2024]

2. Comment regarding NSPS, MACT and Title V Applicability:
NSPS
NSPS Subpart OOO applies to each crusher, screening operation, and belt conveyor in fixed or
portable nonmetallic mineral processing plants manufactured after August 31 1983. The source
owns and operates the aggregate processing equipment to process nonmetallic minerals according to
40 CFR 60.671; therefore, NSPS Subpart OOO applies 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
stationary engine at this source was manufactured after April 1, 2006; therefore, NSPS Subpart IIII
applies to this source.

MACT
40 CFR 63 MACT Subpart ZZZZ applies to owners and operators of stationary RICE at a major or
area source of HAP emissions. This source will have stationary RICE at an area source of HAP
emissions; therefore, MACT Subpart ZZZZ will apply to the stationary engine at this source.

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Title V
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 or a Title IV source. The source is subject to NSPS Subparts
OOO and IIII, and MACT subpart ZZZZ. NSPS Subpart OOO does not exempts sources from the
Title V requirements. Therefore, this facility is a Title V area source. [Last updated February 26,
2024]

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Page 15
ACRONYMS
The following lists commonly used acronyms and associated translations as they apply to this
document:
40 CFR Title 40 of the Code of Federal Regulations
AO Approval Order
BACT Best Available Control Technology
CAA Clean Air Act
CAAA Clean Air Act Amendments
CDS Classification Data System (used by 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

BACT ANALYSIS
The CMC Rock – Heber Valley Concrete Batch Plant facility is located in Wasatch County, which
is in attainment for all criteria pollutants. According to the UDAQ Emissions Impact Assessment
Guidelines, new sources, or modifications to existing sources, whose total controlled emission
increase levels are greater than those listed in Table 1 (R307-410-4) are required to submit a
dispersion modeling analysis as part of a complete NOI.

Table 1

Pollutant Emissions Levels to Require Modeling
(TPY)
SO2 40
NO2 40
PM10 – Fugitive Emissions 5
PM10 – non-fugitive emissions 15
CO 100
Lead 0.6

The CMC Rock facility is a Minor Source with a potential to emit significantly below the thresholds
listed in Table 1. Therefore, a dispersion modeling analysis is not included with the NOI. Instead,
CMC Rock will rely on UDAQ’s in-house Emissions Impact Analysis (EIA).

Utah regulation R301-401-5(2)(d) requires that an analysis of Best Available Control Technology
(BACT) be applied to all regulated air pollutants emitted from a facility. A BACT determination is
made on a case-by-case basis, with consideration given to technological practicability and
economic reasonableness. In all cases BACT must establish emission limitations or specific design
characteristics at least as stringent as applicable New Source Performance Standards.

This BACT analysis provides a discussion on the feasibility of control options for PM10/PM2.5 from
the fugitive emissions resulting from Concrete Batch Plant material handling operations as well as
NOx, PM10/PM2.5, CO, and VOC BACT analyses for combustion sources (i.e., engines/boiler).
CMC Rock believes, for purposes of this NOI, a detailed and comprehensive “top-down”
presentation is not necessary for the Proposed CMC Rock facility equipment because:

1. The equipment is relatively simple and control technology options are limited.

2. Prior analyses and process knowledge have defined BACT categorically and reiteration
of the analyses is not necessary.

Consequently, for each type of equipment covered in the NOI, BACT is identified and the basis
for the choice is discussed.

BACT FOR CONCRETE BATCH PLANT EMISSIONS

With this NOI, CMC Rock has proposed a 250,000 cubic yards per year central mix concrete
batch plant. The batch plant is comprised of three silos for cement and a fly ash silo. Cement is
transferred to a surge hopper via screw conveyors. Screw conveyors transfer the various grades
of cement to the weigh hopper. Fly Ash is also fed from the silo to the weigh scale with screw
conveyors. The Cement and fly ash are then transferred to the central mix drum along with
aggregate/sand and water. The silos are loaded from delivery trucks via pneumatic conveyors
and emissions are controlled by dust collectors. Admixtures are also delivered by truck and
transferred by electric driven pumps. The batch plant equipment is enclosed and equipped
with a dust collector as well. All dust collectors have a vendor stated fabric filter control
efficiency of at least 99%.

The plant includes a recycled concrete crusher and associated material handling grizzly feeder,
screen, conveyors and super-stacker. The concrete impactor and screen plant is controlled by
water spray.

PM10/PM2.5 fugitive emissions from material handling operations include stockpile activity and
wind erosion. PM10/PM2.5 non-fugitive emissions resulting from the facility crusher and
associated screen and conveying operations are subject to NSPS 40 CFR Part 60, Subpart OOO.

An April 2023 search revealed a posted BACT Determination on the San Joaquin Valley Air
Pollution Control District BACT Clearinghouse. The determination incorporates BACT findings from
the EPA/RACT/BACT/LEAR Clearinghouse, the ARB BACT Clearinghouse of Santa Barbara County
APCD, South Coast AQMD, San Diego County APCD, Bay Area AQMD, and Sacramento
Metropolitan AWMD. That determination (Guideline 6.2.2, dated July 31, 2018) lists the following
applicable, technologically feasible and achievable controls.

1) Sand and Aggregate storage: Outdoor storage piles adequately wetted to prevent
visible emissions >5% opacity.

2) SAND/AGGREGATE Handling: Equipped with water sprays on all transfer points.

3) STORAGE SILOS for CEMENT and FLYASH: Enclosed silo vented to a control device with
99% efficiency (baghouse, bin vent or equivalent).

4) CEMENT/FLYASH WEIGH BATCHER: Enclosed weigh batcher vented to a control device
with 99% efficiency (baghouse or equivalent).

5) CENTRAL MIXER LOADING: Enclosed mixer vented to a control device with 99% efficiency
(baghouse or equivalent).
For the planned CMC Rock Concrete Batch Plant Operation: The concrete crusher and material
handling operation are controlled with water spray at all transfer points. The aggregate outdoor
storage piles located at the plant are sprayed with water as needed to maintain an adequate
moisture content. The proposed baghouse/fabric filters for the concrete batch plant silos and
enclosed aggregate bins, cement surge hopper, conveyors, weigh scale and mixer provide
equivalent or greater control than available controls identified in the published BACT
determination.
CMC Rock considers the water spray controls for the aggregate crusher, material handling and
storage piles, as well as the planned baghouse/fabric filter dust collection controls, located at
the silos and enclosed central mix plant equipment as BACT.
BACT FOR HAUL ROADS FUGITIVE EMISSIONS
Fugitive particulate emissions are associated with haul roads. The vehicular disturbance of dust
generates PM10/PM2.5 emissions. UAC R307-205 Emissions Standards: Fugitive Emissions and
Fugitive Dust, requires that new source haul roads meet a 20% opacity limit. The controls
implemented must ensure that the opacity limit is not exceeded.

DAQ-2018-007161, BACT for Small Sources, list the following control options for Haul Roads in
Table 2 below.
Table 2

Pollutant Source Control Options

PM10/PM2.5
Fugitives

Haul Roads
Paved Road with Vacuum
Sweeping and Watering
Paved Road with Sweeping
and Watering
Chemical Suppressant and
Watering
Watering

Sweeping, water spray and paving provide the highest level of control (90-95 percent per Utah
Department of Environmental Quality memorandum, January 12, 2015) of PM10/PM2.5 emissions.
This is considered BACT for the paved roads at the CMC Rock facility.

Fugitive emissions are subject to the fugitive dust control plan requirement of R307-309-6. CMC
Rock believes it can effectively control fugitive dust emissions according to a fugitive dust
emissions control plan and will utilize water sprays and/or sweeping as needed to meet the 20%
opacity limit.

BACT FOR DIESEL-FIRED GENERATOR EMISSIONS
CMC Rock will have one 450 HP diesel engine coupled to the crusher and a generator to
provide electricity to equipment. Pollutant emissions from the internal combustion engine
includes NOx, PM10, PM2.5, CO, SO2, and VOCs. The generator is subject to NSPS 40 CFR Part 60,
Subpart IIII.

DAQ-2018-007161, BACT for Small Sources, list the following control options for Diesel Engines in
Table 3 below.
Table 3

Pollutant Control Technology
NOX Exhaust Gas Recirculation (EGR)
NOx Adsorber Catalyst
Selective Reduction Catalyst (SCR)
Turbocharging and After-Cooling
Engine Ignition Timing Retardation
Modifying Air to Fuel Ratio
SO2 Ultra Low-Sulfur Fuel
VOC Catalyzed Diesel Particulate Filter
Diesel Oxidation Catalyst
PM10/PM2.5 Catalyzed Diesel Particulate Filter
Diesel Oxidation Catalyst
Diesel Particulate Filter

CMC Rock intends to purchase Tier 4f Engine required by NSPS Subpart IIII equipped with EGR
and SCR. Due to the emissions being relatively small, CMC Rock believes that the installation of
any additional controls would not be cost effective for these engines.
DAQ-2018-007161, BACT for Small Sources, states the “DAQ did not find any controls that were
cost effective for controlling PM2.5 emissions or VOC emissions. The document also indicates that
an engine that complies with NSPS Subpart IIII requirements would be considered BACT for NOx
and that use of Ultra Low-Sulfur fuel is BACT for SO2.

Therefore, CMC Rock has determined that purchase of NSPS Subpart IIII compliant engines,
proper maintenance and operation of the stationary diesel engines, and use of ultra low-sulfur
diesel fuel is considered BACT for these engines.

BACT FOR GAS-FIRED BOILER EMISSIONS
With this NOI, CMC Rock has proposed a 6.83 MMBtu/hr Polarmatic Turbomatic Heating System
(boiler). The Turbomatic heating unit is specially designed for concrete batch plant applications;
integrated into the design operation of the plant to exhaust the Turbogas through the filled
aggregate bins to heat the aggregate. See figure 1.

The primary pollutants from the combustion of natural gas in boilers are NOX and CO.
Particulates, SO2, VOC, and HAP are emitted at lower levels.

An emissions report from the vendor reflects a factory test run in Finland, using propane gas as
the fuel. The test run was optimized for CO; not NOx. CO tested concentration was 1 ppm.

Propane fuel combustion is expected to emit 2.3 times as much NOx compared to natural gas
combustion.1 The expected equivalent NOx concentration from natural gas combustion is 47
ppm (108 ppm / 2.3).

Additionally, the filled aggregate bins provide exhaust back pressure. This increased pressure
reduces NOx emissions.2 Based on conversations with the vendor and review of the scientific
research, this back pressure effect is assumed to cut the NOx concentration in half;
approximately 24 ppm entering the aggregate bins.

Lastly, the filled aggregate bins absorb the Turbogas, providing significant control of the NOx
emissions. Although it is not possible to measure the NOx at the top of the bins (no available
stack), the vendor has very conservatively assumed the aggregate absorption provides at least
50% control of the NOx entering the bins; approximately 12 ppm exhausting from the top of the
bins.

Overall, the NOx emissions from the integrated heating system, considering exhaust
backpressure and absorption by the aggregate bins, is close to what you would expect from
ultra-low NOx burners. Ultra-low NOx or low-NOx burners are typically considered BACT, if
commercially available. As previously stated, the Turbomatic heating unit is a specially designed
machine and the existing burner is an integrated part of the machine. A burner retrofit would

1 https://www.engineeringtoolbox.com/nox-emission-combustion-fuels-d_1086.html
2 F. Biagioli, F. Güthe, Effect of pressure and fuel-air unmixedness on NOx emissions from industrial
gas turbine burners, Combustion and Flame
Fuel
require a complete redesign of the machine and concrete batch plant itself. Therefore,
installation of a lower NOx burner is technologically infeasible.

There are no NSPS regulations applicable to boilers with input ratings less than or equal to 10
MMBtu/hr and gas-fired boilers are exempt from the requirements of 40 CFR 63 JJJJJJ (National
Emission Standards for Hazardous Air Pollutants for Area Sources: Industrial, Commercial, and
Institutional Boilers). There are no Utah State rules applicable to PM2.5 emissions from boilers
rated less than 10 MMBtu/hr.

According to DAQ-2018-007161, BACT for Small Sources, DAQ recommends the use of natural
gas as primary fuel and good combustion practices as BACT for boilers with input ratings less
than or equal to 10 MMBtu/hr.
Directions:
Plant Aggregate Processing Capacity 350000 Tons/yr
Plant Maximum Production Capacity 250000 Yards Mix/yr
Storage Pile Size 2.5 Acres
Engines and Heaters units
Natural Gas-fired Auxiliary Heater(s) Capacity -6.83 MMBtu/hr Total
Diesel-fired Engine (Crusher) Size -450 hp Total Fuel Sulfur %0.0015 Default = 0.0015
1 MW = 3.415 MMBtu MMBtu = million British thermal units
hp = horsepower
Roadway Traffic - Paved Roads
Vehicle Type
Transit Mix TruckGravel/Sand Delivery Truck
* Average weight = (Tare wt. + Gross (Loaded) Weight) / 2
18200 0.3329.25
43.5 15475 0.37
Is the Dry Mix and Water Mixed Prior to Loading (Mixer Loading) or After
Loading (Truck Loading)? [Choose One]Mixer Loading
Average Weight of
Vehicles (tons)*
Trip Number
(trips/yr)
Round Trip Distance
(mile/trip)
Potential To Emit Calculator for Concrete Batch Plants
Enter the facility's information below in the cells with red text.
If the throughput capacity of a piece of equipment limits (or bottlenecks) the maximum throughput of other equipment, then input the bottlenecked capacity of that other
equipment, but only if it impacts output of product.
Facility Profile
tons/yr
Process PM PM10 PM2.5 SO2 NOX CO VOC CO2e Total HAPsBatch Mix Operation 1.73 0.72 0.09 ----2.48E-04Aggregate Processing 1.33 0.65 0.01 -----Auxiliary Heater(s)0.22 0.22 0.22 0.02 0.43 2.46 0.16 3502.21 0.06Crusher Engine 0.09 0.09 0.09 0.02 1.30 11.30 4.87 2256.41 0.05Vehicle Traffic 3.85 1.18 0.14 -----Storage Piles 1.12 0.53 0.50 -----Diesel Fuel Tank ------1.26E-03 -
Controlled Emissions (ton/yr)8.33 3.39 0.42 0.04 1.74 13.76 5.03 5758.62 0.11
Fugitive Sources (ton/yr)1.71
Non-fugitive Sources (ton/yr)1.68
Potential To Emit Calculator for Concrete Batch Plants
Summary - Total Potential to Emit
Pollutant
Calculation Methodology
Tons/yr Yards Mix/yr250000 PM PM10 PM2.53 PM PM10 PM2.53
250000 0.0015 0.0007 0.00009 0.19 0.09 0.01
250000 0.0064 0.0031 0.00040 0.80 0.39 0.05
250000 0.0002 0.0001 0.00001 0.03 0.01 0.00
250000 0.0003 0.0002 0.00003 0.04 0.03 0.00
250000 0.000015 7E-06 0.00000 0.00 0.00 0.00
250000 6.4E-05 0.000031 0.00000 0.01 0.00 0.00
250000 7.9E-05 0.000038 0.00000 0.01 0.00 0.00
250000 7.9E-05 0.000038 0.00000 0.01 0.00 0.00
70500 0.0184 0.0055 0.00072 0.65 0.19 0.03
PTE (ton/yr)1.73 0.72 0.09

Note:
1
2
3
4
5
6
99%
Methodology
PTE (ton/yr) = Throughput (tons/yr) x EF (lb/ton) x 1 ton/2000 lb
PTE (ton/yr) = Yards mix/yr x EF (lb/yard) x 1 ton/2000 lb
PM 2.5 emission factors are from AP-42, Chapter 11.12, Concrete Batching, Background Document, Table 17.1. (June 2006)
Central Mix Loading factor is from AP-42, Chapter 11.12, Table 11.12-2, lb/ton of cement and cement supplement
The emission factors in
Tables 11.12-5 and 11.12-6 are based upon the following composition of one yard of concrete.
Coarse Aggregate 1865 pounds
Sand 1428 pounds
Cement 491 pounds
Cement Supplement 73 pounds
Water 20 gallons (167 pounds)
Total: 4024 lbs
South Coast AQMD Particulate Matter (PM) Emission Factors For Processes/Equipment at Asphalt, Cement, Concrete, and Aggregate Product Plants (rev. Dec 2021)
Control Efficiency for enclosed conveyors and
weigh hopper:
Plant Maximum Production Capacity
Sand Unloading
Mixer Loading4,5
Emission factors are in terms of lb/cy mix, except for mixer loading factor
Emission factors are from AP-42, Chapter 11.12, Concrete Batching, Table11.12-6. (June 2006)
Aggregate Unloading
Cement - Unloading to Elevated Storage
Cement Supplement - Unloading to Elevated Storage
Sand - Transfer Conveyor
Aggregate - Transfer Conveyor
Cement Conveyor to Surge Hopper
Weigh Hopper Loading
Potential To Emit Calculator for Concrete Batch Plants
Controlled Emissions from Concrete Batch Mix Materials Handling - Criteria Pollutants
Emission Factor (lb/unit)6 Potential to Emit
Calculation Methodology
Tons/yr3
Arsenic Berylium Cadmium Chromium Lead Manganese Nickel Phosphorus Selenium Arsenic Berylium Cadmium Chromium Lead Manganese Nickel Phosphorus Selenium
61375 4.24E-09 4.86E-10 ND 2.90E-08 1.09E-08 1.17E-07 4.18E-08 ND ND 0.00 0.00 0.00 0.00 0.00 0.00
9125 1.00E-06 9.04E-08 1.98E-10 1.22E-06 5.20E-07 2.56E-07 2.28E-06 3.54E-06 7.24E-08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
70500 2.96E-07 ND 7.10E-10 1.27E-07 3.66E-08 3.78E-06 2.48E-07 1.20E-06 ND 0.00 0.00 0.00 0.00 0.00 0.00 0.00
PTE (ton/yr)1.51E-05 4.27E-07 2.59E-08 1.09E-05 4.00E-06 1.38E-04 2.04E-05 5.85E-05 3.30E-07

Note:
1
2
3
4
Methodology
PTE (ton/yr) = Ton/yr x EF (lb/ton) x 1 ton/2000 lb
Cement - Unloading to Elevated Storage
Cement Supplement - Unloading to Elevated Storage
Potential To Emit Calculator for Concrete Batch PlantsControlled Emissions from Concrete Batch Mix Materials Handling - Hazardous Air Pollutants
Emission Factor (lb/unit)Potential to Emit
Plant Maximum Production Capacity
Mixer Loading3
Emission factors are in terms of lb/ton
Emission factors are from AP-42, Chapter 11.12, Concrete Batching, Table11.12-8. (June 2006)
The throughputs are based upon the following composition of one yard of concrete.
Coarse Aggregate 1865 pounds
Sand 1428 pounds
Cement 491 pounds
Cement Supplement 73 pounds
Water 20 gallons (167 pounds)
Total: 4024 lbs
Central Mix Loading factor is from AP-42, Chapter 11.12, lb/ton of cement and cement supplement
Calculation Methodology
Tons/yr Number of PM PM10 PM2.5 PM PM10 PM2.5
350000 0.003 0.0012 0.00007 1 0.53 0.21 0.01
350000 0.0036 0.0022 ND 1 0.63 0.39
350000 0.00014 0.000046 ND 1 0.02 0.01
350000 0.00014 0.000046 ND 5 0.12 0.04
350000 0.00014 0.000046 ND 1 0.02 0.01
PTE (ton/yr)1.33 0.65 0.01

Note:
1
PTE (ton/yr) = Throughput (tons/yr) x EF (lb/ton) x 8760 hr x 1 ton/2000 lb
Plant Maximum Production Capacity
Crusher
Potential To Emit Calculator for Concrete Batch Plants
Controlled Emissions from Concrete Batch Aggregate Processing - Criteria Pollutants
Emission Factor (lb/ton)Potential to Emit
Screen
Grizzly Feeder Transfer Point
Conveyor Transfer Point
Superstacker Transfer Point
Emission Factors from AP-42, Chapter 11.19, Table 11.19.2-2 (controlled by wet suppression)
Calculation Methodology
Acre - Days2.5 PM PM10 PM2.53 PM PM10 PM2.5
821.25 2.64 1.26 1.188 1.08 0.52 0.49
91.25 0.7 0.34 0.315 0.03 0.02 0.01
PTE (ton/yr)1.12 0.53 0.50

Note:
1
2
3 PM Control Efficiency 80%PM10 Control Efficiency 80%
PM2.5 Control Efficiency 40%
Methodology
PTE (ton/yr) = Throughput (tons/yr) x EF (lb/ton) x 8760 hr x 1 ton/2000 lb
Plant Maximum Storage Pile Capacity (acres)
Active Storage Pile2
Potential To Emit Calculator for Concrete Batch Plants
Emissions from Aggregate/Sand Storage Piles - Criteria Pollutants
Emission Factor (lb/Acre-Day)Potential to Emit
Inactive Storage Pile (Wind Erosion Only)2
Emission Factors from San Diego County Air Pollution Control District, Material Storage Default Values (1/2022), adapted from AP-42, Chapter 8.19.1; Inlcudes the
following distinct source operations in the storage cycle: (1) Loading of aggregate onto storage piles, (2) Equipment traffic in storage areas, (3) Wind erosion of pile.
Assumes 8 to 12 hours of activity / 24 hours.
Assumes 10% of days are inactive
See AP-42 Appendix B.2 for particle size distribution of mechanically produced aggregate
Natural Gas-fired Auxiliary Heater(s) Capacity -6.83 (MMBtu/hr)
Worst Case PTE (ton/yr)PM PM10 PM2.5 SO2 NOX CO VOC HAPs
0.22 0.22 0.22 0.02 0.43 2.46 0.16 0.06
Fuel Type:Natural Gas Used Y
PollutantPMPM102PM2.5 SO2 NOX3 CO VOC HAPs
Emission Factor1 (lb/MMSCF)7.6 7.6 7.6 0.6 14.8 84 5.5 1.89
PTE (ton/yr)0.22 0.22 0.22 0.02 0.43 2.46 0.16 0.06

Note:
1. Emission factors (except NOx) are from AP-42, Chapter 1.4, Tables 1.4-1, 1.4-2, 1.4-3, and 1.4-4 (updated 07/98).2. Assumed PM and PM2.5 emissions are equal to PM10 emissions.
3. NOx emissions factor calculated from Vendor information
Methodology
PTE (ton/yr) = Heat Input (MMBtu/hr) x 1 MMSCF/1,020 MMBtu x EF (lb/MMSCF) x 8760 hr/yr x 1 ton/2000 lb
Potential To Emit Calculator for Concrete Batch Plants
Emissions from Auxiliary Heaters - Criteria Pollutants and Hazardous Air Pollutants
Equation
PPMV Values to Convert
Pollutant PPMV Value Reference
NOx 12
Pollutant Properties
Pollutant Molar Weight Units Notes
NOx 46.01 g/mol As NO2
Gas Properties
Input Value Units
Molar Volume 379.7 dscf/lb-mol at 1 atm and 60 °F
Fd Factor 8710
Corrected Oxygen 3 percent
Calculated lb/MMBtu Values
Pollutant lb/MMBtu Value lb/MMScf Value
NOx 0.0145 14.7545
CONVERT PPMV TO LB/MMBTU
Vendor Information; 108 ppm / 2.3 (estimated from Propane combustion test result)
* 50% (reduction from backpressure) * 50% (reduction from aggregate absorbent)
dscf/MMBtu; Method 19, Table 19-2
450 hp
Worst Case PTE (ton/yr)PM PM10 PM2.5 SO2 NOX CO VOC
0.09 0.09 0.09 0.02 1.30 11.30 4.87
Engine Type:Diesel Engine (<= 600 hp)
Pollutant
PM2,3 PM103 PM253 SO25 NOX2 CO2 VOC1,4
Emission Factor1 (lbs/hp-hr)4.41E-05 4.41E-05 4.41E-05 1.07E-05 6.61E-04 5.73E-03 2.47E-03
PTE (ton/yr)0.09 0.09 0.09 0.02 1.30 11.30 4.87

Note:
2. Tier 4 Diesel Engine Standards3. Assume PM and PM2.5 emissions are equal to PM10 emissions.
4. Assume TOC (total organic compounds) emissions equal to VOC emissions.
5. South Coast AQMD e.f. (rev. 2021): 0.21 lb/1000 gal * gal/138,000 btu * 7000 btu/hp-hr
6. Assume 8760 hours/yr of operation for a non-emergency engine
Methodology
PTE (ton/yr) = Engine Capacity (hp) x EF (lb/hp-hr) x 8760 hr x 1 ton/2000 lb
Potential To Emit Calculator for Concrete Batch Plants
Emissions from Non-Emergency Generator Engine - Criteria Pollutants and Hazardous Air Pollutants
Diesel-fired Emergency Generator Engine Size:
HAPs
0.0523
HAPs1
2.65328E-05
0.0523

AP 42 Emission Factors - Unpaved Roads
E = k*(s/12)a (w/3)b)
Where:
E = emission factor (lb/vehicle mile traveled)Reference:
k = empirical constant =4.9 for PM AP-42, Table 13.2.2-2
1.5 for PM10 AP-42, Table 13.2.2-2
0.15 for PM2.5 AP-42, Table 13.2.2-2
a = empirical constant =0.9 for PM AP-42, Table 13.2.2-2
0.9 for PM10 AP-42, Table 13.2.2-2
0.7 for PM2.5 AP-42, Table 13.2.2-2
0.45 for PM10 AP-42, Table 13.2.2-2
0.45 for PM2.5 AP-42, Table 13.2.2-2
s = road surface silt content =4.8 %AP-42, Table 13.2.2-1
Transit Mix Truck w = mean vehicle weight (tons) =29.3 tons
Gravel/Sand Delivery Truck w = mean vehicle weight (tons) =43.5 tons
The source will use paved roads with periodic sweeping and/or basic watering to control the fugitive dust emissions.
Paved Control Efficiency (%):90%
PM PM10 PM2.5
Transit Mix Truck 0.60 0.18 0.02
Gravel/Sand Delivery Truck 0.72 0.22 0.03
Potential to Emit
Vehicle Traffic
Road Type Avg. Wt. Trips/year Distance PM PM10 PM2.5
Paved Roads 29.25 18200 0.33 1.797 0.550 0.066
Paved Roads 43.5 15475 0.37 2.049 0.627 0.075
PTE (ton/yr)3.85 1.18 0.14
Methodology:
PTE (tons/yr) = Trips/yr x Distance (miles) x Emission Factor (lb/mile) x 1 ton/2,000 lbs
Note:
1
Vehicle Type
Transit Mix Truck
Gravel/Sand Delivery Truck
Emission Factors from AP-42, Chapter 13.2.2; UDAQ guidance offers an alternative to use the "unpaved" roads emission factors and applying a control efficiency for paving, watering and sweeping.
Potential To Emit Calculator for Concrete Batch Plants
Emissions from Vehicle Traffic - Criteria Pollutants
According to AP 42, Chapter 13.2.2 - Unpaved Roads (01/2011), the PM/PM10/PM2.5 emission factors for paved roads can be estimated from the following equation:
Emission Factors (lb/mile)
Pollutant
Source Fuel Throughput Units Annual Operating Hours Conversions
Natural Gas-fired Auxiliary Heater(s)Natural Gas 6.83 MMBtu/Hr 8760
Diesel Fired Engine(s)Diesel 450 HP 8760 7000 btu/hp-hr
Table C-1 (EPA Default High Heat Values and Emission Factors)
Default Emission Factor kg CO2 / MMBtu kg CH4/MMBtu kg NO2/MMBtu
Natural Gas 53.06 1.0E-03 1.0E-04
No. 2 Fuel Oil 73.96 3.0E-03 6.0E-04
Still Gas 66.72
LPG 61.71 3.0E-03 6.0E-04
Propane 62.87 3.0E-03 6.0E-04
Isobutane 64.94 3.0E-03 6.0E-04
Butane 64.77 3.0E-03 6.0E-04
Conversion from BTU to Dth is 1.00 Dth = 1,000,000 Btu
CO2 Equivalent Emissions; Global Warming Potential (GWP) Factors
1
28
265
GWP factors effective July 2023; AR5
CO2 CH4 N2O
metric tons metric tons metric tons
Natural Gas-fired Auxiliary Heater(s)3174.79 5.98E-02 5.98E-03
Diesel Fired Engine(s)2040.85 8.28E-02 1.66E-02
Potential To Emit Calculator for Concrete Batch Plants
Emissions - Green House Gas Pollutants
CO2e CO2e
metric tons tons
Natural Gas-fired Auxiliary Heater(s)3178.05 3502.21
Diesel Fired Engine(s)2047.56 2256.41
Energy
1 Dth (or 1 MMBtu)
59833.94
27594.00

Directions:
Plant Aggregate Processing Capacity 350000 Tons/yr
Plant Maximum Production Capacity 250000 Yards Mix/yr
Storage Pile Size 2.5 Acres
Engines and Heaters units
Natural Gas-fired Auxiliary Heater(s) Capacity -6.83 MMBtu/hr Total
Diesel-fired Engine (Crusher) Size -450 hp Total Fuel Sulfur %0.0015 Default = 0.0015
1 MW = 3.415 MMBtu MMBtu = million British thermal units
hp = horsepower
Roadway Traffic - Paved Roads
Vehicle Type
Transit Mix Truck
Gravel/Sand Delivery Truck
* Average weight = (Tare wt. + Gross (Loaded) Weight) / 2
18200 0.3329.25
43.5 15475 0.37
Is the Dry Mix and Water Mixed Prior to Loading (Mixer Loading) or After
Loading (Truck Loading)? [Choose One]Mixer Loading
Average Weight of Vehicles
(tons)*
Trip Number
(trips/yr)
Round Trip Distance
(mile/trip)
Potential To Emit Calculator for Concrete Batch Plants
Enter the facility's information below in the cells with red text.
If the throughput capacity of a piece of equipment limits (or bottlenecks) the maximum throughput of other equipment, then input the bottlenecked capacity of that other
equipment, but only if it impacts output of product.
Facility Profile
tons/yr
Process PM PM10 PM2.5 SO2 NOX CO VOC Total HAPs
Batch Mix Operation 1.73 0.72 0.09 ----2.48E-04
Aggregate Processing 1.33 0.65 0.01 -----
Auxiliary Heater(s)0.22 0.22 0.22 0.02 0.43 2.46 0.16 0.06
Crusher Engine 0.09 0.09 0.09 0.02 1.30 11.30 4.87 0.05
Vehicle Traffic 3.85 1.18 0.14 -----
Storage Piles 1.12 0.53 0.50 -----
Controlled Emissions (ton/yr)8.33 3.39 0.42 0.04 1.74 13.76 5.03 0.11
Fugitive Sources (ton/yr)1.71
Non-fugitive Sources (ton/yr)1.68
Potential To Emit Calculator for Concrete Batch Plants
Summary - Total Potential to Emit
Pollutant
Calculation Methodology
Tons/yr Yards Mix/yr250000 PM PM10 PM2.53 PM PM10 PM2.53
250000 0.0015 0.0007 0.00009 0.19 0.09 0.01
250000 0.0064 0.0031 0.00040 0.80 0.39 0.05
250000 0.0002 0.0001 0.00001 0.03 0.01 0.00
250000 0.0003 0.0002 0.00003 0.04 0.03 0.00
250000 0.000015 7E-06 0.00000 0.00 0.00 0.00
250000 6.4E-05 0.000031 0.00000 0.01 0.00 0.00
250000 7.9E-05 0.000038 0.00000 0.01 0.00 0.00
250000 7.9E-05 0.000038 0.00000 0.01 0.00 0.00
70500 0.0184 0.0055 0.00072 0.65 0.19 0.03
PTE (ton/yr)1.73 0.72 0.09

Note:
1
2
3
4
5
6
99%
Methodology
PTE (ton/yr) = Throughput (tons/yr) x EF (lb/ton) x 1 ton/2000 lb
PTE (ton/yr) = Yards mix/yr x EF (lb/yard) x 1 ton/2000 lb
PM 2.5 emission factors are from AP-42, Chapter 11.12, Concrete Batching, Background Document, Table 17.1. (June 2006)
Central Mix Loading factor is from AP-42, Chapter 11.12, Table 11.12-2, lb/ton of cement and cement supplement
The emission factors in
Tables 11.12-5 and 11.12-6 are based upon the following composition of one yard of concrete.
Coarse Aggregate 1865 pounds
Sand 1428 pounds
Cement 491 pounds
Cement Supplement 73 pounds
Water 20 gallons (167 pounds)
Total: 4024 lbs
South Coast AQMD Particulate Matter (PM) Emission Factors For Processes/Equipment at Asphalt, Cement, Concrete, and Aggregate Product Plants (rev. Dec 2021)
Control Efficiency for enclosed conveyors
and weigh hopper:
Plant Maximum Production Capacity
Sand Unloading
Mixer Loading4,5
Emission factors are in terms of lb/cy mix, except for mixer loading factor
Emission factors are from AP-42, Chapter 11.12, Concrete Batching, Table11.12-6. (June 2006)
Aggregate Unloading
Cement - Unloading to Elevated Storage
Cement Supplement - Unloading to Elevated Storage
Sand - Transfer Conveyor
Aggregate - Transfer Conveyor
Cement Conveyor to Surge Hopper
Weigh Hopper Loading
Emissions
Controlled Emissions from Concrete Batch Mix Materials Handling - Criteria Pollutants
Emission Factor (lb/unit)6 Potential to Emit
Calculation Methodology
Tons/yr3
Arsenic Berylium Cadmium Chromium Lead Manganese Nickel Phosphorus Selenium Arsenic Berylium Cadmium Chromium Lead Manganese Nickel Phosphorus Selenium
61375 4.24E-09 4.86E-10 ND 2.90E-08 1.09E-08 1.17E-07 4.18E-08 ND ND 0.00 0.00 0.00 0.00 0.00 0.00
9125 1.00E-06 9.04E-08 1.98E-10 1.22E-06 5.20E-07 2.56E-07 2.28E-06 3.54E-06 7.24E-08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
70500 2.96E-07 ND 7.10E-10 1.27E-07 3.66E-08 3.78E-06 2.48E-07 1.20E-06 ND 0.00 0.00 0.00 0.00 0.00 0.00 0.00
PTE (ton/yr)1.51E-05 4.27E-07 2.59E-08 1.09E-05 4.00E-06 1.38E-04 2.04E-05 5.85E-05 3.30E-07

Note:
1
2
3
4
Methodology
PTE (ton/yr) = Ton/yr x EF (lb/ton) x 1 ton/2000 lb
Cement - Unloading to Elevated Storage
Cement Supplement - Unloading to Elevated Storage
Potential To Emit Calculator for Concrete Batch PlantsControlled Emissions from Concrete Batch Mix Materials Handling - Hazardous Air Pollutants
Emission Factor (lb/unit)Potential to Emit
Plant Maximum Production Capacity
Mixer Loading3
Emission factors are in terms of lb/ton
Emission factors are from AP-42, Chapter 11.12, Concrete Batching, Table11.12-8. (June 2006)
The throughputs are based upon the following composition of one yard of concrete.
Coarse Aggregate 1865 pounds
Sand 1428 pounds
Cement 491 pounds
Cement Supplement 73 pounds
Water 20 gallons (167 pounds)
Total: 4024 lbs
Central Mix Loading factor is from AP-42, Chapter 11.12, lb/ton of cement and cement supplement
Calculation Methodology
Tons/yr

Units
PM PM10 PM2.5 PM PM10 PM2.5
350000 0.003 0.0012 0.00007 1 0.53 0.21 0.01
350000 0.0036 0.0022 ND 1 0.63 0.39
350000 0.00014 0.000046 ND 1 0.02 0.01
350000 0.00014 0.000046 ND 5 0.12 0.04
350000 0.00014 0.000046 ND 1 0.02 0.01
PTE (ton/yr)1.33 0.65 0.01

Note:
1
PTE (ton/yr) = Throughput (tons/yr) x EF (lb/ton) x 8760 hr x 1 ton/2000 lb
Plant Maximum Production Capacity
Crusher
Potential To Emit Calculator for Concrete Batch Plants
Controlled Emissions from Concrete Batch Aggregate Processing - Criteria Pollutants
Emission Factor (lb/ton)Potential to Emit
Screen
Grizzly Feeder Transfer Point
Conveyor Transfer Point
Superstacker Transfer Point
Emission Factors from AP-42, Chapter 11.19, Table 11.19.2-2 (controlled by wet suppression)
Calculation Methodology
Acre - Days2.5 PM PM10 PM2.53 PM PM10 PM2.5
821.25 2.64 1.26 1.188 1.08 0.52 0.49
91.25 0.7 0.34 0.315 0.03 0.02 0.01
PTE (ton/yr)1.12 0.53 0.50

Note:
1
2
3
PM Control Efficiency 80%PM10 Control Efficiency 80%
PM2.5 Control Efficiency 40%
Methodology
PTE (ton/yr) = Throughput (tons/yr) x EF (lb/ton) x 8760 hr x 1 ton/2000 lb
Plant Maximum Storage Pile Capacity (acres)
Active Storage Pile2
Potential To Emit Calculator for Concrete Batch Plants
Emissions from Aggregate/Sand Storage Piles - Criteria Pollutants
Emission Factor (lb/Acre-Day)Potential to Emit
Inactive Storage Pile (Wind Erosion Only)2
Emission Factors from San Diego County Air Pollution Control District, Material Storage Default Values (1/2022), adapted from AP-42, Chapter 8.19.1; Inlcudes the
following distinct source operations in the storage cycle: (1) Loading of aggregate onto storage piles, (2) Equipment traffic in storage areas, (3) Wind erosion of pile.
Assumes 8 to 12 hours of activity / 24 hours.
Assumes 10% of days are inactive
See AP-42 Appendix B.2 for particle size distribution of mechanically produced aggregate
Natural Gas-fired Auxiliary Heater(s) Capacity -6.83 (MMBtu/hr)
Worst Case PTE (ton/yr)PM PM10 PM2.5 SO2 NOX CO VOC HAPs
0.22 0.22 0.22 0.02 0.43 2.46 0.16 0.06
Fuel Type:Natural Gas Used Y
Pollutant
PM PM102 PM2.5 SO2 NOX3 CO VOC HAPs
Emission Factor1 (lb/MMSCF)7.6 7.6 7.6 0.6 14.8 84 5.5 1.89
PTE (ton/yr)0.22 0.22 0.22 0.02 0.43 2.46 0.16 0.06

Note:
1. Emission factors (except NOx) are from AP-42, Chapter 1.4, Tables 1.4-1, 1.4-2, 1.4-3, and 1.4-4 (updated 07/98).2. Assumed PM and PM2.5 emissions are equal to PM10 emissions.
3. NOx emissions factor calculated from Vendor information
Methodology
PTE (ton/yr) = Heat Input (MMBtu/hr) x 1 MMSCF/1,020 MMBtu x EF (lb/MMSCF) x 8760 hr/yr x 1 ton/2000 lb
Potential To Emit Calculator for Concrete Batch Plants
Emissions from Auxiliary Heaters - Criteria Pollutants and Hazardous Air Pollutants
Equation
PPMV Values to Convert
Pollutant PPMV Value Reference
NOx 12
Pollutant Properties
Pollutant Molar Weight Units Notes
NOx 46.01 g/mol As NO2
Gas Properties
Input Value Units
Molar Volume 379.7 dscf/lb-mol at 1 atm and 60 °F
Fd Factor 8710
Corrected Oxygen 3 percent
Calculated lb/MMBtu Values
Pollutant lb/MMBtu Value lb/MMScf Value
NOx 0.0145 14.7545
CONVERT PPMV TO LB/MMBTU
Vendor Information; 108 ppm / 2.3 (estimated from Propane combustion test result)
* 50% (reduction from backpressure) * 50% (reduction from aggregate absorbent)
dscf/MMBtu; Method 19, Table 19-2
450 hp
Worst Case PTE (ton/yr)PM PM10 PM2.5 SO2 NOX CO VOC
0.09 0.09 0.09 0.02 1.30 11.30 4.87
Engine Type:Diesel Engine (<= 600 hp)
Pollutant
PM2,3 PM103 PM2.53 SO25 NOX2 CO2 VOC1,4
Emission Factor1 (lbs/hp-hr)4.41E-05 4.41E-05 4.41E-05 1.07E-05 6.61E-04 5.73E-03 2.47E-03
PTE (ton/yr)0.09 0.09 0.09 0.02 1.30 11.30 4.87

Note:
2. Tier 4 Diesel Engine Standards
3. Assume PM and PM2.5 emissions are equal to PM10 emissions.
4. Assume TOC (total organic compounds) emissions equal to VOC emissions.
5. South Coast AQMD e.f. (rev. 2021): 0.21 lb/1000 gal * gal/138,000 btu * 7000 btu/hp-hr
6. Assume 8760 hours/yr of operation for a non-emergency engine
Methodology
PTE (ton/yr) = Engine Capacity (hp) x EF (lb/hp-hr) x 8760 hr x 1 ton/2000 lb
Potential To Emit Calculator for Concrete Batch Plants
Emissions from Non-Emergency Generator Engine - Criteria Pollutants and Hazardous Air Pollutants
Diesel-fired Emergency Generator Engine Size:
HAPs
0.0523
HAPs1
2.65328E-05
0.0523

AP 42 Emission Factors - Unpaved Roads
E = k*(s/12)a (w/3)b)
Where:
E = emission factor (lb/vehicle mile traveled)Reference:
k = empirical constant =4.9 for PM AP-42, Table 13.2.2-2
1.5 for PM10 AP-42, Table 13.2.2-2
0.15 for PM2.5 AP-42, Table 13.2.2-2
a = empirical constant =0.9 for PM AP-42, Table 13.2.2-2
0.9 for PM10 AP-42, Table 13.2.2-2
0.7 for PM2.5 AP-42, Table 13.2.2-2
0.45 for PM10 AP-42, Table 13.2.2-2
0.45 for PM2.5 AP-42, Table 13.2.2-2
s = road surface silt content =4.8 %AP-42, Table 13.2.2-1
Transit Mix Truck w = mean vehicle weight (tons) =29.3 tons
Gravel/Sand Delivery Truck w = mean vehicle weight (tons) =43.5 tons
The source will use paved roads with periodic sweeping and/or basic watering to control the fugitive dust emissions.
Paved Control Efficiency (%):90%
PM PM10 PM2.5
Transit Mix Truck 0.60 0.18 0.02
Gravel/Sand Delivery Truck 0.72 0.22 0.03
Potential to Emit
Vehicle Traffic
Road Type Avg. Wt. Trips/year Distance PM PM10 PM2.5
Paved Roads 29.25 18200 0.33 1.797 0.550 0.066
Paved Roads 43.5 15475 0.37 2.049 0.627 0.075
PTE (ton/yr)3.85 1.18 0.14
Methodology:
PTE (tons/yr) = Trips/yr x Distance (miles) x Emission Factor (lb/mile) x 1 ton/2,000 lbs
Note:
1
Vehicle Type
Transit Mix Truck
Gravel/Sand Delivery Truck
Emission Factors from AP-42, Chapter 13.2.2; UDAQ guidance offers an alternative to use the "unpaved" roads emission factors and applying a control efficiency for paving, watering and sweeping.
Potential To Emit Calculator for Concrete Batch Plants
Emissions from Vehicle Traffic - Criteria Pollutants
According to AP 42, Chapter 13.2.2 - Unpaved Roads (01/2011), the PM/PM10/PM2.5 emission factors for paved roads can be estimated from the following equation:
Emission Factors (lb/mile)
Pollutant
3/14/24, 12:46 AM State of Utah Mail - CMC Rock NSR Application
https://mail.google.com/mail/u/1/?ik=20ff41d2e4&view=pt&search=all&permmsgid=msg-f:1793348019919600593&simpl=msg-f:1793348019919600593 1/3
Enqiang He <[e-mail]>
CMC Rock NSR Application
[e-mail] <[e-mail]>Tue, Mar 12, 2024 at 12:59 PM
To: Enqiang He <[e-mail]>
Cc: Sam Cusick <[e-mail]>
EQ,

Attached you will find the calculations. We apologize but thought we had included some of these items in the last email. Also see my
responses in red below.

Thanks,

Taylor Larson
C: [phone]
E: [e-mail]

From: Enqiang He <[e-mail]>
Sent: Tuesday, February 27, 2024 12:10 AM
To: [e-mail]
Cc: Sam Cusick <[e-mail]>
Subject: Re: CMC Rock NSR Applicaon

Sam and Talor,

I have finished reviewing the documents submitted last december. I have the
following questions. Some of the questions were those I made in the email dated
9/14/23. I'm seeking your help with answers:

1. Is there any manufacturer's statement or tests regarding back pressure
and absorption effect of the filled aggregate that can significantly reduce NOx
emissions in the flue gas from the boiler/heater? Here is a statement
3/14/24, 12:46 AM State of Utah Mail - CMC Rock NSR Application
https://mail.google.com/mail/u/1/?ik=20ff41d2e4&view=pt&search=all&permmsgid=msg-f:1793348019919600593&simpl=msg-f:1793348019919600593 2/3
received back from the manufacturer regarding the absorption and back
pressure.

“Secondly, this is the value after burner, before the TURBOgas, consisting of the flue gases and vapor, is led to aggregate bins filled with sand
and stone. The material in the bins causes back pressure into the pipeline, through which the TURBOgas is led to the aggregate bins. It is
found in scientific research that when pressure increases, the NOX value goes down, reference: [F. Biagioli, F. Güthe, Effect of pressure and
fuel-air unmixedness on NOx emis-sions from industrial gas turbine burners, Combustion and Flame]. This already reduces the NOX
remarkably prior to entering the aggregate bins.”

2. Provide the manufacturer's or installer's recommended pressure drop ranges
for the baghouses. See below spec for bag houses.

3. Provide greenhouse gas (GHG) emission calculations. See attached

4. Are there diesel storage tanks on site? if yes, provide the tank capacity and
emissions. See attached

5. Are there any disturbed areas on site? If yes, calculate emissions. All areas
have been covered with gravel.
[Quoted text hidden]
3/14/24, 12:46 AM State of Utah Mail - CMC Rock NSR Application
https://mail.google.com/mail/u/1/?ik=20ff41d2e4&view=pt&search=all&permmsgid=msg-f:1793348019919600593&simpl=msg-f:1793348019919600593 3/3
[Quoted text hidden]
PTE Calculations CMC Heber Central Mix Plant 3.11.2024.xlsx
328K
2/21/24, 10:33 AM State of Utah Mail - CMC Rock NSR Application
https://mail.google.com/mail/u/1/?ik=20ff41d2e4&view=pt&search=all&permmsgid=msg-a:r-3500422745614232866&simpl=msg-a:r-35004227456142…1/1
Enqiang He <[e-mail]>
CMC Rock NSR Application
Enqiang He <[e-mail]>Thu, Sep 14, 2023 at 6:49 PM
To: Sam Cusick <[e-mail]>
Cc: Taylor Larson <[e-mail]>
Sam,
I have conducted technical reviews on your permit application (NOI). Here are some
questions I'd like to ask you for help:
1. The capacities for conveyors/stackers are listed in tons per hour. We need their
physical sizes, for example, 10' x 8'.
2. BACT analysis for the hot water boiler is inadequate. NOx concentration of 140 ppm
seems very high. We'd like to see if low NOx burners and/or ultra-low NOx burners
could be economically feasible to bring down the emissions.
3. Are there any disturbed areas on site not counting haul roads and storage piles?
4. Are there any fuel storage tanks on site?
5. Please show correct sources of emission factors for aggregate/sand storage piles.
Maybe it's a good idea to email us a copy of spreadsheets that would show how the
emission factors and emissions were calculated.
Let me know if you have any questions. Please Provide the above information so we
can move forward. Thank you.
EQ He, CPM
Permitting Engineer, Minor NSR Section, Permitting Branch |
Division of Air Quality
1950 West 195 North, Salt Lake City, UT 84116
Phone: [phone]
[e-mail]
[Quoted text hidden]