DAQ-2024-004459

DAQE-AN101850012-24

{{$d1 }}

Grant Ensign
Geneva Rock Products, Incorporated
730 North 1500 West
Orem, UT 84057
[e-mail]

Dear Mr. Ensign:

Re: Approval Order: Administrative Amendment to Approval Order DAQE-AN101850011-20, dated
October 21, 2020, to Add and Replace a Baghouse under R307-401-12 Reduction in Air
Pollutants
Project Number: N101850012

The attached Approval Order (AO) is issued pursuant to the Notice of Intent (NOI) received on August
31, 2023. Geneva Rock Products, Incorporated must comply with the requirements of this AO, all
applicable state requirements (R307), and Federal Standards.

The project engineer for this action is Dungan Adams, 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:DA:jg

cc: Davis 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

January 8, 2024

STATE OF UTAH
Department of Environmental Quality
Division of Air Quality

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APPROVAL ORDER
DAQE-AN101850012-24
Administrative Amendment to Approval Order
DAQE-AN101850011-20, dated October 21, 2020, to Add and
Replace a Baghouse under R307-401-12 Reduction in Air Pollutants

Prepared By
Dungan Adams, Engineer
[phone]
[e-mail]

Issued to
Geneva Rock Products - Layton Concrete Batch Plant

Issued On
{{$d2 }}

Issued By

{{$s }}

Bryce C. Bird
Director
Division of Air Quality
January 8, 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.................................................................................................................. 3
SUMMARY OF EMISSIONS .................................................................................................... 4
SECTION I: GENERAL PROVISIONS .................................................................................... 4
SECTION II: PERMITTED EQUIPMENT .............................................................................. 5
SECTION II: SPECIAL PROVISIONS ..................................................................................... 6
PERMIT HISTORY ..................................................................................................................... 8
ACRONYMS ................................................................................................................................. 9

DAQE-AN101850012-24
Page 3

GENERAL INFORMATION

CONTACT/LOCATION INFORMATION

Owner Name Source Name
Geneva Rock Products, Incorporated Geneva Rock Products, Incorporated - Layton
Concrete Batch Plant

Mailing Address Physical Address
730 North 1500 West 750 East 3000 North
Orem, UT 84057 Layton, UT 84041

Source Contact UTM Coordinates
Name Grant Ensign 420,048 m Easting
Phone [phone],550,482 m Northing
Email [e-mail] Datum NAD83
UTM Zone 12

SIC code 3273 (Ready-Mixed Concrete)

SOURCE INFORMATION
General Description
Geneva Rock Products, Incorporated (Geneva Rock) operates the Layton Concrete Batch Plant. The
facility includes one (1) central mix concrete batch plant, one (1) truck mix concrete batch plant, one (1)
natural gas water heater, and various conveyors. The plant produces a maximum of 284,500 cubic yards
of concrete per year.

NSR Classification
Administrative Amendment

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

Applicable Federal Standards
None
Project Description
Geneva Rock has requested to add a baghouse to the Truck Mix Concrete Batch Plant loading point and
replace the current baghouse on the Central Mix Concrete Plant with a baghouse that has a greater
volumetric flow rate.

DAQE-AN101850012-24
Page 4

SUMMARY OF EMISSIONS

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

Criteria Pollutant Change (TPY) Total (TPY)
CO2 Equivalent 0 5101.00
Carbon Monoxide 0 4.50
Nitrogen Oxides 0 9.13
Particulate Matter - PM10 0 6.06
Particulate Matter - PM2.5 0 6.06
Sulfur Dioxide 0 0.82
Volatile Organic Compounds 0 1.21

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Generic HAPs (CAS #GHAPS) 0 160
Change (TPY) Total (TPY)
Total HAPs 0 0.08

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]

DAQE-AN101850012-24
Page 5

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

SECTION II: PERMITTED EQUIPMENT

II.A THE APPROVED EQUIPMENT

II.A.1 Layton Concrete Batch Plant

II.A.2 Various Storage Tanks
Contents: Fuel Oil, Gasoline, Diesel

II.A.3 One (1) Central Mix Concrete Batch Plant
Three (3) Elevated Cement Silos
One (1) Elevated Fly Ash Silo
Two (2) Sand and Aggregate Storage Silos
One (1) Central Mixer
One (1) Weigh/holding Hopper
One (1) Baghouse (7,500 acfm)
Central Mix Concrete Batch Plant Control: Baghouse and Bin Vents

II.A.4 One (1) Truck Mix Concrete Batch Plant
One (1) Elevated Cement Silo
One (1) Elevated Fly Ash Silo
Two (2) Sand and Aggregate Storage Bins
One (1) Weigh Hopper
One (1) Baghouse (6,500 acfm)
Truck Mix Concrete Batch Plant Control: Baghouse and Bin Vents

II.A.5 Various Associated Conveyors

II.A.6 One (1) Natural Gas Water Heater (9.9 MMBtu/hr)
Capacity: 9.9 MMBtu/hr
Low NOx rated

II.A.7 One (1) Front-end Loader
Listed for informational purposes only

II.A.8 Various Mobile Equipment
Listed for informational purposes only

DAQE-AN101850012-24
Page 6

SECTION II: SPECIAL PROVISIONS

II.B REQUIREMENTS AND LIMITATIONS

II.B.1 The Layton Concrete Batch Plant shall be subject to the following:
II.B.1.a The owner/operator shall not produce more than 284,500 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 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, visible emissions from the following emission points shall
not exceed the following values:

A. All conveyor transfer points - 7% opacity

B. All diesel engines - 20% opacity

C. All conveyor drop points - 20% opacity

D. All concrete batch plants - 7% opacity

E. All other points - 20% opacity.

[R307-305-3, R307-309-5, R307-312-4, 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. [R307-305-3]

II.B.2 All Haul Roads and Fugitive Dust Sources shall be subject to the following:
II.B.2.a The owner/operator shall comply with a fugitive dust control plan acceptable to the Director for
control of all dust sources associated with the Layton Concrete Batch Plant. [R307-309-6]

II.B.2.b The owner/operator shall not allow visible emissions from haul roads and fugitive dust sources to
exceed 20 % opacity on site and 10% opacity at the property boundary. [R307-309-5]

II.B.2.b.1 The owner/operator shall make visible emission determinations for fugitive dust from haul roads
and operational areas using procedures similar to Method 9. The normal requirement for
observations to be made at 15-second intervals over a six-minute period, however, shall not
apply. Visible emissions shall be measured at the densest point of the plume but at a point not
less than one-half vehicle length behind the vehicle and not less than one-half the height of the
vehicle. [R307-205-4, R307-309-5, R307-401-8]

II.B.2.c The owner/operator shall pave the haul road from the site entrance to the concrete batch plant.
[R307-401-8]

DAQE-AN101850012-24
Page 7

II.B.2.d The owner/operator shall use water application or other control options contained in R307-309 to
minimize emissions from fugitive dust and fugitive emissions sources, including haul roads,
storage piles, and disturbed areas. Controls shall be applied to ensure the opacity limits in this
AO are not exceeded. [R307-309, R307-401-8]

II.B.2.d.1 The owner/operator shall keep records of treatment for all periods when the plant is in operation.
The records shall include the following items:

A. Date of treatment

B. Number of treatments made and quantity

C. Rainfall received, if any, and approximate amount

D. Time of day treatments were made.

[R307-401-8]

II.B.3 Baghouse Conditions
II.B.3.a The owner/operator shall use a baghouse fabric filter to control emissions from the central mix
concrete batch plant and the truck mix concrete batch plant. [R307-401-8]

II.B.3.b The owner/operator shall install a manometer or magnehelic pressure gauge to measure the static
pressure differential across the baghouse. [R307-401-8]

II.B.3.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.3.b.2 The pressure gauge shall measure the static pressure differential in 1-inch water column
increments or less. [R307-401-8]

II.B.3.c The owner/operator shall maintain the static pressure differential of the baghouse between two
(2) and eleven (11) inches of water column as measured on the pressure gauge, per the
manufacturer recommended range for normal operation. [R307-401-8]

II.B.3.c.1 The owner/operator shall record the static pressure differential at least once per operating day
while the baghouse is operating. [R307-401-8]

II.B.3.c.2 The owner/operator shall maintain the following records of the static pressure differential:

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

II.B.3.d.1 The owner/operator shall maintain records of the pressure gauge calibrations and replacements.
[R307-401-8]

DAQE-AN101850012-24
Page 8

PERMIT HISTORY

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

Supersedes AO DAQE-AN101850011-20 dated October 21, 2020
Is Derived From NOI dated August 31, 2023
Incorporates Additional Information dated October 17, 2023
Incorporates Additional Information dated October 25, 2023
Incorporates Additional Information dated November 16, 2023

DAQE-AN101850012-24
Page 9

ACRONYMS

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

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

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 3
SUMMARY OF EMISSIONS

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

Criteria Pollutant Change (TPY) Total (TPY)
CO2 Equivalent 0 5101.00
Carbon Monoxide 0 4.50
Nitrogen Oxides 0 9.13
Particulate Matter - PM10 0 6.06
Particulate Matter - PM2.5 0 6.06
Sulfur Dioxide 0 0.82
Volatile Organic Compounds 0 1.21

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Generic HAPs (CAS #GHAPS) 0 160
Change (TPY) Total (TPY)
Total HAPs 0 0.08

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

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 4
Review of BACT for New/Modified Emission Units

1. BACT review regarding Layton Concrete Batch Plant
The project does not increase the potential to emit of any air pollutant or cause emissions of any
new air pollutant. Therefore, the existing AO DAQE-AN101850011-20 is updated in accordance
with R307-401-12, Reduction in Air Pollutants. This rule does not require a BACT analysis. [Last
updated December 7, 2023]

SECTION I: GENERAL PROVISIONS

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

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

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

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

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

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

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

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

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 7
II.B.2.b.1
NEW
The owner/operator shall make visible emission determinations for fugitive dust from haul
roads and operational areas using procedures similar to Method 9. The normal requirement
for observations to be made at 15-second intervals over a six-minute period, however, shall
not apply. Visible emissions shall be measured at the densest point of the plume but at a point
not less than one-half vehicle length behind the vehicle and not less than one-half the height of
the vehicle. [R307-205-4, R307-309-5, R307-401-8]

II.B.2.c The owner/operator shall pave the haul road from the site entrance to the concrete batch plant.
[R307-401-8]

II.B.2.d The owner/operator shall use water application or other control options contained in R307-309
to minimize emissions from fugitive dust and fugitive emissions sources, including haul roads,
storage piles, and disturbed areas. Controls shall be applied to ensure the opacity limits in this
AO are not exceeded. [R307-309, R307-401-8]

II.B.2.d.1
NEW
The owner/operator shall keep records of treatment for all periods when the plant is in
operation. The records shall include the following items:

A. Date of treatment

B. Number of treatments made and quantity

C. Rainfall received, if any, and approximate amount

D. Time of day treatments were made. [R307-401-8]

II.B.3 Baghouse Conditions
II.B.3.a
NEW
The owner/operator shall use a baghouse fabric filter to control emissions from the central mix
concrete batch plant and the truck mix concrete batch plant. [R307-401-8]

II.B.3.b The owner/operator shall install a manometer or magnehelic pressure gauge to measure the
static pressure differential across the baghouse. [R307-401-8]

II.B.3.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.3.b.2 The pressure gauge shall measure the static pressure differential in 1-inch water column
increments or less. [R307-401-8]

II.B.3.c The owner/operator shall maintain the static pressure differential of the baghouse between two
(2) and eleven (11) inches of water column as measured on the pressure gauge, per the
manufacturer recommended range for normal operation. [R307-401-8]

II.B.3.c.1 The owner/operator shall record the static pressure differential at least once per operating day
while the baghouse is operating. [R307-401-8]

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 8
II.B.3.c.2
NEW
The owner/operator shall maintain the following records of the static pressure differential.

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

II.B.3.d.1 The owner/operator shall maintain records of the pressure gauge calibrations and
replacements. [R307-401-8]

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 9
PERMIT HISTORY

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

Supersedes DAQE-AN101850011-20 dated October 21, 2020
Is Derived From NOI dated August 31, 2023
Incorporates Additional Information dated October 17, 2023
Incorporates Additional Information dated October 25, 2023
Incorporates Additional Information dated November 16, 2023

REVIEWER COMMENTS

1. Comment regarding Baghouse Modifications:
GRP is replacing the original 2,400 acfm baghouse on the central mix concrete batch plant (CBP)
with a new 7,500 acfm baghouse. The addition of the larger baghouse will result in a 0.33 TPY
increase in PM10 emissions and a 0.096 TPY increase in PM2.5 emissions. These emission estimates
are calculated using the grain loading, volumetric flow rate, and annual hours of operation of each
baghouse and the particle size distribution of the particulate matter.

GRP is adding a 6,500 acfm baghouse to the loading point of the truck mix CBP. The truck loading
of the CBP was previously uncontrolled. The addition of the baghouse will result in a 5.69 TPY
decrease in PM10 emissions and a 1.67 TPY decrease in PM 2.5 emissions. These emission estimates
are calculated using the truck loading emission factors from Table 11.12-2 of AP-42 Section 11.12.

The overall effect of replacement and addition of baghouses would result in decreases in the site-
wide PTE, the existing AO DAQE-AN101850011-20 is updated in accordance with R307-401-12,
Reduction in Air Pollutants. The baghouse modifications result in a net emission decrease of 5.36
TPY of PM10 and 1.58 TPY of PM2.5. However, since the site-wide PM10 PTE in the existing AO is
6.06 TPY, it is likely the original emission calculations assumed truck loading was controlled, when
it reality it was not. Now that baghouse control is added to the truck loading process, the estimates in
the existing AO more accurately account for PM emissions, and the site-wide PTE will remain
unchanged. [Last updated December 7, 2023]

2. Comment regarding PM2.5 Emissions:
The site-wide PTE of PM2.5 emissions were not included in the previous AO DAQE-AN101850011-
20. For a conservative estimate, the PTE of PM2.5 was set equal to the PTE of PM10 (6.06 tpy). [Last
updated November 9, 2023]

3. Comment regarding Federal Subpart Applicability:
40 CFR 60 NSPS Subpart Dc (Standards of Performance for Small Industrial-Commercial-
Institutional Steam Generating Units) applies to steam generating units with a maximum heat input
capacity of 100 MMBtu/hr or less, but greater than or equal to 10 MMBtu/hr. The applicability date
for NSPS Subpart Dc is June 9, 1989. The boiler at this facility is less than 10 MMBTU/hr.
Therefore, this source is not subject to this subpart.

40 CFR 63 MACT Subpart JJJJJJ (National Emission Standards for Hazardous Air Pollutants for
Industrial, Commercial, and Institutional Boilers Area Sources) applies to industrial, commercial, or
institutional boilers located in an area source for HAPs. This subpart only applies to boilers that burn
coal, biomass, oil or other liquid fuel, and non-waste material. Gas-fired boilers are not subject to
Grain loading (gr/dscf)0.02
Anuual operation (hr)1185.00
Old baghouse (acfm)2400.00
New baghouse (acfm)7500.00
Baghouse PM10 lb/yr PM10 TPY PM2.5 TPY
Original 308.61 0.15 0.045
New 964.42 0.48 0.142
Anuual Production (CY/year 142,250
Emission Factors (lb/ton)Uncontrolled Controlled
Truck loading 0.3100 0.0263
Truck Loading Emissions PM10 TPY PM2.5 TPY
Original (Uncontrolled)6.22 1.83 P
New (Controlled) 0.53 0.16
PM10 5.36
PM2.5 1.58
Replacing 2,400 acfm baghouse with 7,500 acfm baghouse on Central Mix CBP
Adding 6,500 scfm baghouse to Truck Mix CBP
Total Reduction (TPY)
PM2.5 15.00
PM10 51.00
Percent PM2.5 of PM10 29.41%
PM10 Increase (TPY)PM2.5 Decrease (TPY)
0.33 0.096
PM10 Decrease (TPY)PM2.5 Decrease (TPY)
5.69 1.67
PM Particle Size Distribution
%
%
11/6/23, 3:09 PM State of Utah Mail - Administrative Action for Park City, Pelican Point, and Layton sites
https://mail.google.com/mail/u/0/?ik=c52f18613a&view=pt&search=all&permthid=thread-a:r-3341916234006763665&simpl=msg-a:r6911946948739…1/10
Dungan Adams <[e-mail]>
Administrative Action for Park City, Pelican Point, and Layton sites
16 messages
Dungan Adams <[e-mail]>Thu, Sep 21, 2023 at 4:04 PM
To: Grant Ensign <[e-mail]>
Good afternoon Grant,
The DAQ has received Geneva Rock's request for administrative action for the Park City Concrete Batch Plant, the
Pelican Point Limestone, Aggregate, & Concrete Facility, and the Layton Concrete Batch Plant. After talking with my peers
and manager, here are my comments on each request.
Park City Concrete Batch Plant (DAQE-AN106970002-22):
A change which causes any site-wide PTE increase, no matter how small, will not be able to be completed through
an administrative action. Because the diesel storage tanks increase site-wide PTE, these changes will require a
minor modification. Let me know how you would like to proceed.
Pelican Point Limestone, Aggregate, & Concrete Facility (DAQE-AN108430013-21):
In order to accept the request to change requirement II.B.16.b through administrative action, we need to see some
sort of analysis justifying that diesel #1 and diesel #2 produce the same level of emissions. When I talked with my
manager, he suggested that a scientific paper comparing the emissions of the two types would be satisfactory.
Diesel #2 is less refined and has a higher viscosity than diesel #1 and therefore could cause a very slight emission
increase. You are correct that the current language used is often "the owner/operator shall use #1, #2, or a
combination of #1 and #2 diesel fuel in all stationary diesel engines on site". However, I believe that making this
language adjustment could increase the sitewide PTE. Unless you can provide a better argument showing how the
emissions of #1 and #2 diesel fuel are the same when combusted, this change will likely fall outside the bounds of
an administrative amendment and require a minor modification.
Layton Concrete Batch Plant (DAQE-AN101850011-20):
The changes requested for this site should fall under administrative action. However, in order to make the emission
reductions enforceable, I will need you to provide updated emission calculations showing the reduction in PTE
caused by the new and additional baghouses.
Please let me know if you have any questions or concerns.
Thanks,
Dungan
--

Dungan Adams
Environmental Engineer I | Minor NSR Section
M: [phone]
11/6/23, 3:09 PM State of Utah Mail - Administrative Action for Park City, Pelican Point, and Layton sites
https://mail.google.com/mail/u/0/?ik=c52f18613a&view=pt&search=all&permthid=thread-a:r-3341916234006763665&simpl=msg-a:r6911946948739…2/10
airquality.utah.gov
Grant Ensign <[e-mail]>Tue, Sep 26, 2023 at 2:32 PM
To: Dungan Adams <[e-mail]>
Dungan,
Thanks for geng back to me on these.
Park City (DAQE-AN106970002-22)
If this can't be modified under an administrave rule, then please proceed in modifying it under the normal
modificaon process. Thanks.
Pelican Point (DAQE-AN108430013-21)
Our justification for this one is the same as before. AP-42 is the federally approved emissions
standard and they do not differentiate between diesel #1 and diesel #2 for emission rates. I've
looked for scientific papers and can't find anything out there that tabulates separate emission rates for
these. There doesn't seem to be another standard to compare against when the highest standard is
already posted and used across the industry. I CAN find where descriptions about the viscosity and
refinement are mentioned (seems like we both did the same Google search 🙂) but viscosity doesn't
relate to an internal heating value so I can't see that playing into a potential higher emission rate that
you claimed. Do you have another data source to say otherwise? I can't provide calculations
showing the differences because the standard calculation in AP-42 is the same.
Layton (DAQE-AN101850011-20)
We are preparing the calcs for this one and will be in touch soon.
Thanks!
Grant Ensign
ENVIRONMENTAL SPECIALIST
O [phone] 
C [phone]
WWW.CLYDEINC.COM

From: Dungan Adams <[e-mail]>
Sent: Thursday, September 21, 2023 4:04 PM
To: Grant Ensign <[e-mail]>
Subject: Administrave Acon for Park City, Pelican Point, and Layton sites

[Quoted text hidden]
Dungan Adams <[e-mail]>Wed, Sep 27, 2023 at 11:52 AM
To: Grant Ensign <[e-mail]>
Hi Grant,
11/6/23, 3:09 PM State of Utah Mail - Administrative Action for Park City, Pelican Point, and Layton sites
https://mail.google.com/mail/u/0/?ik=c52f18613a&view=pt&search=all&permthid=thread-a:r-3341916234006763665&simpl=msg-a:r6911946948739…3/10
After further conversation with my manager, the justification for the Pelican Point administrative action is acceptable. I
haven't been able to find any literature that differentiates the emission rates of the two fuel types and since AP-42 does
not differentiate between #1 and #2 for emission rates or calculations, your argument makes sense to me. I will proceed
with the administrative action.
To proceed with the Park City modification, I will need updated emission calculations that include the new tanks. Because
this is now a modification, it will require BACT analysis, but this can be kept very short as the change is so small. I think
all the other information needed for an NOI application was provided in the initial request. Let me know if there are any
other changes that you would like to make to the current permit during the modification and if you have any questions.
Thanks,
Dungan
[Quoted text hidden]
2 attachments
Outlook-Clyde Comp.png
5K
Outlook-Clyde Comp.png
5K
Grant Ensign <[e-mail]>Wed, Sep 27, 2023 at 1:12 PM
To: Dungan Adams <[e-mail]>
Thanks, Dungan. I’ll get you the updated information for Park City.
—————
Grant Ensign
Clyde Companies
ENVIRONMENTAL SPECIALIST
O [phone]
C [phone]
WWW.CLYDEINC.COM
From: Dungan Adams <[e-mail]>
Sent: Wednesday, September 27, 2023 11:52:37 AM
To: Grant Ensign <[e-mail]>
Subject: Re: Administrave Acon for Park City, Pelican Point, and Layton sites

[Quoted text hidden]
Grant Ensign <[e-mail]>Tue, Oct 17, 2023 at 12:42 PM
To: Dungan Adams <[e-mail]>
HI Dungan,

Here is the updated letter for the Layton facility. Please let me know if you have any questions.

Thanks!
11/6/23, 3:09 PM State of Utah Mail - Administrative Action for Park City, Pelican Point, and Layton sites
https://mail.google.com/mail/u/0/?ik=c52f18613a&view=pt&search=all&permthid=thread-a:r-3341916234006763665&simpl=msg-a:r6911946948739…4/10
[Quoted text hidden]
GRP. Layton. 10.17.23. Aministrative Amendment Request to AO.pdf
1778K
Dungan Adams <[e-mail]>Wed, Oct 18, 2023 at 4:48 PM
To: Grant Ensign <[e-mail]>
Hi Grant,
In order to accept the production limit change, I will need you to provide some more detail on the emission calculations.
1. Outside of PM10, all potential site-wide emissions are decreasing (see emission estimates from current AO
below). Please explain what is causing these reductions.
2. I was not able to see how the increased control (baghouse on Truck-Mix Plant) reduces PM10 in the provided
calculations. Please provide calculations that show these reductions for PM10 and PM2.5.
These are the site-wide emissions from the current approval order DAQE-AN101850011-20:
CO2 Equivalent 5101 TPY
Carbon Monoxide 4.5 TPY
Nitrogen Oxides 9.13 TPY
PM10 6.06 TPY
PM2.5 Not included
Sulfur Dioxide 0.82 TPY
VOCs 1.21 TPY
Total Haps 0.08 TPY
I am a little confused by these emissions. From my understanding the only fuel burning equipment on site is the low NOx
rated 9.9 MMBtu/hr boiler. Even if that was to run 8760 hours per year, it would only emit ~2.22 TPY of NOx,
substantially lower than the 9.13 TPY in the AO. Is there another NOx emitting source that is missing from the current
AO?
Please let me know if I am missing something and if you have any questions.
Thanks,
Dungan
[Quoted text hidden]
Grant Ensign <[e-mail]>Wed, Oct 18, 2023 at 5:21 PM
To: Dungan Adams <[e-mail]>
Hi Dungan,

Thanks for looking this over. I can see why this is confusing.

Unfortunately, we do not possess the initial calculations that were carried out when the NOI was originally submitted.
Therefore, my reference point is solely based on what the AO indicates regarding PTE emissions. I'm uncertain about the
source of the 9.13 TPY NOx emissions calculation, and I suspect that the permit has undergone several revisions, while
the PTE values have remained consistent with the initial data.

For the PM10 and PM2.5 calculations, I began with a baseline of 6.06 PM10 tpy and 284,500 CY production, as per the
AO's specified limits. Then, I explored the scenario in which all production occurred at the truck mix plant, known for its
higher emissions compared to the central mix plant (worst case scenario). After factoring in the baghouse control and
processing 284,500 CY through the truck mix plant, I arrived at a PM10 value of 6.01 tpy (using AP-42 calcs). This
11/6/23, 3:09 PM State of Utah Mail - Administrative Action for Park City, Pelican Point, and Layton sites
https://mail.google.com/mail/u/0/?ik=c52f18613a&view=pt&search=all&permthid=thread-a:r-3341916234006763665&simpl=msg-a:r6911946948739…5/10
indicated that I could increase PM10 emissions by the difference between 6.06 and 6.01. By increasing production to
287,000, I successfully restored the PM10 emissions to the original PTE value of 6.06 tpy.

Since PM2.5 isn’t part of the AO PTE, I didn’t include those.

Please let me know if you have any further questions.

Thanks.
[Quoted text hidden]
[Quoted text hidden]
[Quoted text hidden]
[Quoted text hidden]
[Quoted text hidden]

Grant Ensign
[Quoted text hidden]
C [phone]
WWW.CLYDEINC.COM

[Quoted text hidden]
[Quoted text hidden]
[Quoted text hidden]
Dungan Adams <[e-mail]>Thu, Oct 19, 2023 at 3:40 PM
To: Grant Ensign <[e-mail]>
Hi Grant,
Like you mentioned, DAQE-AN101850011-20 has been updated many times over the past 20 or so years. I think at some
point the annual production limit no longer matched the emission rates. What I mean by this is even if Geneva Rock
produced 284,500 CY of concrete PM10 emissions would be below 6.06 TPY. Similarly, if they ran the boiler for 8760
hours per year the NOx emissions would be below 9.13 TPY.
I've just taken a look at AP-42 Table 11.12-5 & 11.12-6 and the controlled and uncontrolled emission factors are the same.
You have suggested the baghouse added to the Truck Mix Plant has reduced PM10 emissions from 6.06 TPY to 6.01 TPY
for an annual production of 284,500 CY. Since the emission factors are identical regardless of control, I am not
convinced that this is the case.
Please calculate emissions for the plant operating at 284,500 CY with and without the baghouse control. If the baghouse
control does not impact emissions, then the modification is not reducing PM10 as you have suggested. Allowing a
production increase to 287,000 CY would then increase actual emissions and will not be able to be completed through
Administrative Action.
Let me know if this makes sense and if you have any questions.
Thanks,
Dungan
11/6/23, 3:09 PM State of Utah Mail - Administrative Action for Park City, Pelican Point, and Layton sites
https://mail.google.com/mail/u/0/?ik=c52f18613a&view=pt&search=all&permthid=thread-a:r-3341916234006763665&simpl=msg-a:r6911946948739…6/10
[Quoted text hidden]
Grant Ensign <[e-mail]>Tue, Oct 24, 2023 at 1:44 PM
To: Dungan Adams <[e-mail]>
Dungan,

Do you have time tomorrow morning to jump on a call to discuss these sites and the calculations associated with the
PTE? Say 10:00?
[Quoted text hidden]
Dungan Adams <[e-mail]>Tue, Oct 24, 2023 at 1:46 PM
To: Grant Ensign <[e-mail]>
Yes, that works for me.
See you tomorrow,
Dungan
[Quoted text hidden]
Grant Ensign <[e-mail]>Wed, Oct 25, 2023 at 12:33 PM
To: Dungan Adams <[e-mail]>
Cc: Kamren Garfield <[e-mail]>
Dungan,

Please see the revised Administrative Amendment Request for the Geneva Rock Products facility in Layton, Utah.
[Quoted text hidden]
GRP. Layton. 10.25.23. Aministrative Amendment Request to AO.pdf
587K
Dungan Adams <[e-mail]>Wed, Oct 25, 2023 at 1:48 PM
To: Grant Ensign <[e-mail]>
Cc: Kamren Garfield <[e-mail]>
Thanks Grant,
The request looks good. I will proceed with the first option, identifying the control methods as “Baghouse and/or Bin Vent”.
As for the two questions you brought up during our meeting:
1. Thresholds for modeling are defined in R307-410. In attainment areas sources are required to submit modeling if
their PTE is above (or increases above in the case of a modification) the following values:
11/6/23, 3:09 PM State of Utah Mail - Administrative Action for Park City, Pelican Point, and Layton sites
https://mail.google.com/mail/u/0/?ik=c52f18613a&view=pt&search=all&permthid=thread-a:r-3341916234006763665&simpl=msg-a:r6911946948739…7/10
There is a similar table in R307-410 for HAPs.
2. Generally, for modifications and amendments, emission calculations are only needed for the parts undergoing
modification or amendment (ex. For the storage tanks proposed for the Park City modification, the only required
emission calculations are those of the tanks, not a recalculation of the entire site). For a reduction in air pollutants
for an amendment, emission calculations are required to make the reduction enforceable in the new AO. If there is
no change in emissions (as is the case for the Layton modification) then no calculations are required.
The DAQ may ask for site-wide calculations if the modification affects the entire site, such as production changes,
or if the potential emissions of the old AO seem inaccurate. Site-wide emissions will only be requested to provide
clarity when it is challenging to discern the specific changes in emissions a modification is causing.
I hope this helps. Let me know if you have any more questions.
Thanks,
Dungan
[Quoted text hidden]
Grant Ensign <[e-mail]>Thu, Oct 26, 2023 at 1:27 PM
To: Dungan Adams <[e-mail]>
Cc: Kamren Garfield <[e-mail]>
Dungan,
Ok, yes that makes sense. Thanks for your help.
I’ll try to get Park City back over to you by tomorrow.
Thanks.
—————
Grant Ensign
Clyde Companies
ENVIRONMENTAL SPECIALIST
O [phone]
C [phone]
WWW.CLYDEINC.COM
From: Dungan Adams <[e-mail]>
Sent: Wednesday, October 25, 2023 1:48:00 PM
To: Grant Ensign <[e-mail]>
Cc: Kamren Garfield <[e-mail]>
[Quoted text hidden]

[Quoted text hidden]
Grant Ensign <[e-mail]>Fri, Oct 27, 2023 at 3:37 PM
To: Dungan Adams <[e-mail]>
11/6/23, 3:09 PM State of Utah Mail - Administrative Action for Park City, Pelican Point, and Layton sites
https://mail.google.com/mail/u/0/?ik=c52f18613a&view=pt&search=all&permthid=thread-a:r-3341916234006763665&simpl=msg-a:r6911946948739…8/10
Cc: Kamren Garfield <[e-mail]>
Hi Dungan,

Please see the attached permit modification for the Geneva Rock Park City facility.

Thanks.

From: Grant Ensign <[e-mail]>
Sent: Thursday, October 26, 2023 1:28 PM
To: Dungan Adams <[e-mail]>
Cc: Kamren Garfield <[e-mail]>
Subject: Re: Administrative Action for Park City, Pelican Point, and Layton sites

Dungan,

Ok, yes that makes sense. Thanks for your help.

I’ll try to get Park City back over to you by tomorrow.

Thanks.

—————
Grant Ensign

Clyde Companies
ENVIRONMENTAL SPECIALIST
O [phone]
C [phone]
WWW.CLYDEINC.COM
From: Dungan Adams <[e-mail]>
Sent: Wednesday, October 25, 2023 1:48:00 PM
To: Grant Ensign <[e-mail]>
Cc: Kamren Garfield <[e-mail]>
Subject: Re: Administrative Action for Park City, Pelican Point, and Layton sites

Thanks Grant,

11/6/23, 3:09 PM State of Utah Mail - Administrative Action for Park City, Pelican Point, and Layton sites
https://mail.google.com/mail/u/0/?ik=c52f18613a&view=pt&search=all&permthid=thread-a:r-3341916234006763665&simpl=msg-a:r6911946948739…9/10
The request looks good. I will proceed with the first option, identifying the control methods as “Baghouse and/or Bin Vent”.
As for the two questions you brought up during our meeting:

1. Thresholds for modeling are defined in R307-410. In attainment areas sources are required to submit modeling if
their PTE is above (or increases above in the case of a modification) the following values:
[Quoted text hidden]
[Quoted text hidden]
[Quoted text hidden]
Geneva Rock. Park City. 10.27.23 Permit Modification.pdf
1155K
Dungan Adams <[e-mail]>Wed, Nov 1, 2023 at 1:21 PM
To: Grant Ensign <[e-mail]>
Hi Grant,
I wanted to provide updates on the three requests that you have submitted for GRP. I have a couple of questions and
comments about the Layton and Park City requests.
Layton Facility Amendment
After reviewing the current AO for the Layton Facility, the AO has a condition that specifically requires a baghouse for the
central mix concrete batch plant (II.B.3.a). Since a baghouse is required for the central mix, the "and/or" wording is
problematic. I can change the equipment description for the central mix to "Baghouse (7,500 acfm) and Bin Vent". The
requested description for the truck mix is good. Is that acceptable?
I also think adding "Various Storage Silos" to the approved equipment list is redundant, since the silos and
control methods will be listed under the descriptions of the central and truck mix concrete batch plants. If you are set on
adding the "Various Storage Silos" condition I will have to confirm that is a change that can be made through an
Administrative Amendment.
Park City Modification
The BACT and emission calculations for the storage tanks look good.
Changing the control device to "Baghouse and/or Bin Vents" is acceptable for the Truck Mix #2 and Truck Mix Portable.
The current AO for the Park City Facility has a condition that specifically requires a 12,000 acfm baghouse for the central
mix concrete batch plant (II.B.9.a). Since this is a modification, it is possible to change/remove conditions but I am
guessing this was included in the permit initially as part of BACT analysis. I think the easiest option is this:
1. Change control method to "Baghouse (12,000 acfm)" for the central mix batch plant for II.A.2 instead of
"Baghouse and/or Bin Vent"
2. Remove the equipment "One (1) Reverse Air Baghouse for the #1 CCBP" entirely as the 12,000 acfm is the only
other requirement in II.B.9.a and it will be listed under the control of the Central Mix CBP.
3. Again, I think adding "Various Storage Silos" in the approved equipment section is redundant. "Various Material
Storage Silos" is already included under the three batch plants as is the control
11/6/23, 3:09 PM State of Utah Mail - Administrative Action for Park City, Pelican Point, and Layton sites
https://mail.google.com/mail/u/0/?ik=c52f18613a&view=pt&search=all&permthid=thread-a:r-3341916234006763665&simpl=msg-a:r691194694873…10/10
If you want to change the control for the Central Mix CBP to "Baghouse and/or Bin Vent" then condition II.B.9.a will need
to be changed and you will need to provide more in depth BACT analysis explaining why a bin vent is as good or better
control than a 12,000 acfm baghouse.
Pelican Point Modification
No questions with this project. It is currently being reviewed.
Please let me know what questions you have. I am happy to schedule another meeting if you think it would be better to
discuss anything over a call.
Thanks,
Dungan
[Quoted text hidden]
Grant Ensign <[e-mail]>Mon, Nov 6, 2023 at 12:12 PM
To: Dungan Adams <[e-mail]>
Hi Dungan,

Thanks for reaching out. Sorry, I’m slow getting you a response.

Layton:
I agree with your assessment. Please proceed with "Baghouse (7,500 acfm) and Bin Vent". It’s okay to leave out the
“Various Storage Silos”.

Park City:
Please continue with changing the control device to "Baghouse and/or Bin Vents" for the Truck Mix #2 and Truck Mix
Portable.

I agree with your three steps below for the Central Mix. Please proceed with that.

It’s okay to leave out the “Various Storage Silos”.

Pelican Point:
Sounds good!
[Quoted text hidden]
0 

17 October 2023 

Utah Department of Environmental Quality
Division of Air Quality
Alan Humpherys
150 North 1950 West
Salt Lake City, Utah 84115

Subject: Geneva Rock Products, Inc.
Request to modify Approval Order under “Administrative Amendment.”
Approval Order (DAQE-AN101850011-20)
Layton Concrete Batch Plant
Layton, Utah

Dear Alan Humpherys,

Geneva Rock Products, Inc. (Geneva Rock) formally submitted a request to amend the Layton
Air Quality Approval Order on August 28th, 2023, through an Administrative Amendment
(R307-401-12). The purpose of this letter is to fulfill your team's request for additional
information, accompanied by supplementary data necessary for the modification of the
Approval Order. This communication supersedes the previous letter and contains all the
crucial information from the initial letter, making it a comprehensive standalone document.
Please contact me at any time if you have questions. You can reach me at
[e-mail] or [phone].
Sincerely,

Grant Ensign
Environmental Specialist

GENEVA ROCK PRODUCTS, INC.
LAYTON CONCRETE BATCH PLANT FACILITY
NOTICE OF INTENT TO REVISE AIR QUALITY APPROVAL ORDER DAQE-AN101850011-20

Prepared by Clyde Companies, Inc. Property & Environmental Department
Submitted to Utah Division of Air Quality via email on October 17, 2023

Contents 
1. PROJECT OVERVIEW .............................................................................................................. 1 
2. DESCRIPTION OF PROPOSED CHANGES ................................................................................. 1 
3. PTE, EMISSION CALCULATIONS, AND BACT ........................................................................... 4 

1 

1. PROJECT OVERVIEW 
Geneva Rock Products, Inc. (Geneva Rock) operates the Layton Concrete Batch Plant minor 
source facility located at 750 East 3000 North, Layton, UT.  The facility includes one (1) central 
mix concrete batch plant (CBP) and one (1) truck mix CBP. 

2. DESCRIPTION OF PROPOSED CHANGES 
It's important to note that Geneva Rock acknowledges the prerequisite for an "administrative" 
modification of an existing Approval Order (AO), which mandates that the site‐wide potential‐
to‐emit emissions (PTE) must not increase.  As explained in this letter, the proposed changes 
align with this requirement, even though there have been adjustments in individual equipment 
and production emissions to meet this criterion. 
Geneva Rock requests the following changes to the AO: 
1. Change Truck Mix CBP control method to baghouse. 
2. Replace the baghouse at the Central Mix CBP with one of similar pollutant removal 
efficiency. 
3. Add bin vent filter as an approved control method for the Central Mix CBP silos. 
4. As a result of increased PM10 control on the Truck Mix CBP, increase concrete 
production for a net zero emissions change. 

2.1 Change Truck Mix CBP control method to baghouse 

In October 2022, the Truck Mix Concrete Batch Plant (CBP) integrated a baghouse with prior 
submission of a notice‐to‐construct to the UDEQ. While the bin vents on top of the storage 
silos still effectively handle fugitive dust emissions from the silos during material loading, 
the baghouse has been installed to further address a separate source of fugitive dust 
emissions at the mixer truck loading point. Airborne particulates are typically generated 
when water, cement, fly ash, aggregates, and additives are loaded into the mixer truck. The 
baghouse employs vacuum filtration at the loadout point to efficiently capture fugitive dust. 

Table 1 below identifies the manufacturer and model of the added baghouse.  Additionally, 
Table 3 shows the current and potential PTE after the AO modifications. 

Table 1: Truck Mix CBP Baghouse 
Plant Condition ACFM Manufacturer/Model
Truck Mix CBP New 6,500 R&S/6500 

2 

Geneva Rock requests that permit item II.A.4 be updated to reflect this change.  The 
following visuals reflect the requested change from the existing AO to an updated AO: 

Existing AO: 

Requested changes to updated AO: 

2.2 Replace the baghouse at the Central Mix CBP with one of similar pollutant removal 
efficiency. 
Since January 2023, the Central Mix CBP has been under construction and inoperable.  A 
new baghouse on this plant will be installed by the end of 2023.  With the exchange of one 
baghouse to another, this item is considered a replacement‐in‐kind and does not affect the 
PTE since the pollutant removal efficiency is the same. 

Table 2 shows information about the old and new baghouses at the central mix CBP: 
Table 2: Central Mix CBP Baghouse 
Plant Baghouse ACFM Manufacturer/Model Notes
Central Mix CBP 
Original 
99.99% 
efficiency 
2,400 W.W. Sly 
Manufacturing/PC‐105 
Removed from the site in 
January 2023.  
Central Mix CBP 
New 
99.99% 
efficiency 
7,500 C&W/CP7500 Will be installed by the 
end of 2023.   

Baghouse (6,500 acfm) 
3 

Geneva Rock is requesting that permit items II.A.3 be updated to reflect these changes. The 
following visuals reflect the requested changes from the existing Approval Order to an 
updated Approval Order: 
Existing AO: 

Requested changes to updated AO: 

2.3 Add bin vent filter as an approved control method for the Central Mix CBP silos. 
It is a common misconception that baghouses are always used as a control for fugitive 
emissions on silos, however, this is most often inaccurate.  Baghouses are typically used to 
control fugitive emissions through active filtration during loading of concrete mixer trucks 
while bin vents filter displaced air through passive air flow as the silos are being filled. Since 
bin vents were in place prior to this AO amendment, Geneva Rock is requesting that an 
additional item (II.A.9) be added to the AO to account for the bin‐vents on both the central 
mix and truck mix plants.  This modification does not affect the PTE: 

II.A.9 Various Storage Silos 
 Control: Bin‐vents 

2.4 As a result of increased PM10 control on the Truck Mix CBP, increase concrete production 
for a net zero emissions change. 
Geneva Rock requests that the site wide Concrete Production Limit be increased from the 
current 284,500 CY to 287,000 CY; an increase of 2,500 CY.   

(7,500 acfm) 
4 

Geneva Rock requests that permit item II.B.1.a be updated to reflect these changes.  The 
following visuals reflect the requested change from the existing AO to an updated AO: 

Existing AO: 

Requested changes to updated AO: 

3. PTE, EMISSION CALCULATIONS, AND BACT 
3.1 PTE 
Table 3 below shows the (Potential To Emit) PTE Emissions in tons/year between the 
current AO totals and the proposed AO totals. 
Table 3: PTE Emissions (TPY) 
Source Description Sitewide Concrete Production 
(cu yds) 
PM10 
(TPY) 
Current Approval Order 284,500 6.06 
Proposed Production 
Increase Due to Addition 
of controls 
287,000 6.06 
Difference between 
current and proposed AO +2,500 0.00 
*PM2.5 is not included on the current AO, therefore, it was included in this table.  Additionally, PM2.5 is 
conservatively assumed to equal PM10. 

287,000 
5 

3.2 Emission Calculations 

6 

7 

8 

3.3 BACT for PM10/PM2.5 
At the Layton facility, GRP is using ducting, skirting, and other means of directing PM emissions to
the baghouse for capture of at least 99% pollutant removal. These controls represent BACT for
PM10/PM2.5 emissions at the concrete batch plants.

Geneva Rock appreciates the opportunity to submit this request to amend the permit. Please reach
out should you have any questions.
0 

25 October 2023 

Utah Department of Environmental Quality
Division of Air Quality
Alan Humpherys
150 North 1950 West
Salt Lake City, Utah 84115

Subject: Geneva Rock Products, Inc.
Request to modify Approval Order under “Administrative Amendment.”
Approval Order (DAQE-AN101850011-20)
Layton Concrete Batch Plant
Layton, Utah

Dear Alan Humpherys,

Geneva Rock Products, Inc. (Geneva Rock) formally submitted a request to amend the Layton
Air Quality Approval Order on August 28th and October 17th, 2023, through an Administrative
Amendment (R307-401-12). The purpose of this letter is to fulfill your team's request for
additional information, accompanied by supplementary data necessary for the modification of
the Approval Order. This communication supersedes the previous letters and contains all the
crucial information from the initial letters, making it a comprehensive standalone document.
Please contact me at any time if you have questions. You can reach me at
[e-mail] or [phone].
Sincerely,

Grant Ensign
Environmental Specialist

GENEVA ROCK PRODUCTS, INC.
LAYTON CONCRETE BATCH PLANT FACILITY
REQUEST TO MODIFY AIR QUALITY APPROVAL ORDER DAQE-AN101850011-20

Prepared by Clyde Companies, Inc. Property & Environmental Department
Submitted to Utah Division of Air Quality via email on October 25, 2023

Contents 
1. PROJECT OVERVIEW .............................................................................................................. 1 
2. DESCRIPTION OF PROPOSED CHANGES ................................................................................. 1 

1 

1. PROJECT OVERVIEW 
Geneva Rock Products, Inc. (Geneva Rock) operates the Layton Concrete Batch Plant minor 
source facility located at 750 East 3000 North, Layton, UT.  The facility includes one (1) central 
mix concrete batch plant (CBP) and one (1) truck mix CBP. 

2. DESCRIPTION OF PROPOSED CHANGES 
It's important to note that Geneva Rock acknowledges the prerequisite for an "administrative" 
modification of an existing Approval Order (AO), which mandates that the site‐wide potential‐
to‐emit emissions (PTE) must not increase.  As explained in this letter, the proposed changes 
align with this requirement, even though there have been adjustments in individual equipment 
to meet this criterion. 
Geneva Rock requests the following changes to the AO: 
1. Change CBP control method to “Baghouse and/or Bin Vent” OR remove control 
methods altogether. 
2. Add “Baghouse and/or Bin Vent” as an approved control method for the CBP silos. 

2.1 Change CBP control method to “Baghouse and/or Bin Vent” OR remove control methods 
altogether. 

In the current AO, the Central Mix CBP lists a baghouse as part of the approved equipment 
[AO item “II.A.3”] and the Truck Mix CBP lists the control method as “Bin Vent” [AO item 
“II.A.4”].  Since Table 11.12 in AP‐42 contains identical values between “Uncontrolled” and 
“Controlled” emissions, listing a baghouse or bin vent is for informational purposes only.  
Therefore, Geneva Rock requests that the AO be updated in one of the following ways: 

1. Identify the control method for both the Central Mix and Truck Mix CBPs as “Baghouse 
and/or Bin Vent”, or 
2. Remove the mention of baghouses or bin vents for the CBPs. 
2 

If option 1 above is selected by DAQ, then the information in Table 1 below can be used to 
identify the baghouses on the Truck Mix and Central Mix CBPs.   

Table 1: CBP Baghouses 
Plant ACFM Manufacturer/Model
Central Mix CBP 7,500 
(99.99% efficiency) C&WCP7500 
Truck Mix CBP 6,500 
(99.99 % efficiency) R&S/6500 

The change would be reflected on the AO as demonstrated in the following manner: 

If option 2 above is selected by DAQ, then the change would be reflected on the AO as 
demonstrated in the following manner: 

One (1) Baghouse (6,500 acfm) and/or Bin Vent 
Baghouse (7,500 acfm) and/or Bin Vent 
3 

2.2 Add “baghouse and/or bin vent” as an approved control method for the CBP silos. 
Bin vents are the most prevalent emission control method employed for silos. They function 
by filtering out displaced air through passive airflow when the silos are being filled. In 
contrast, baghouses use an active airflow system (vacuum) to filter the air during the 
loading of concrete mixer trucks at the loadout point. Occasionally, a piping system is 
installed at the top of the silos and redirected to the baghouse. Consequently, Geneva Rock 
is requesting a new item be added (“II.A.9”) to accommodate both types of emission 
controls for silos. It's essential to note that this modification will not impact the PTE. 

The change would be reflected on the AO as demonstrated in the following manner: 

II.A.9 Various Storage Silos 
 Control: Baghouse and/or Bin Vent 

Geneva Rock appreciates the opportunity to submit this request to amend the permit. Please reach
out should you have any questions.
DAQE-

RN101850012
December 7, 2023

Grant Ensign
Geneva Rock Products, Inc.
730 North 1500 West
Orem, UT 84057
[e-mail]

Dear Grant Ensign,

Re: Engineer Review:
Administrative Amendment to Approval Order DAQE-AN101850011-20, dated October 21,
2020, to Add and Replace a Baghouse under R307-401-12 Reduction in Air Pollutants
Project Number: N101850012

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

Geneva Rock Products, Inc. should contact Dungan Adams at [phone] if there are questions or
concerns with the review of the draft permit conditions. Upon resolution of your concerns, please email
Dungan Adams at [e-mail] the signed cover letter. Upon receipt of the signed cover
letter, the DAQ will prepare an Approval Order (AO) for signature by the DAQ Director.

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

Approval Signature _____________________________________________________________
(Signature & Date)

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

Kimberly D. Shelley
Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director
State of Utah

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 1
UTAH DIVISION OF AIR QUALITY
ENGINEER REVIEW

SOURCE INFORMATION

Project Number N101850012
Owner Name Geneva Rock Products, Inc.
Mailing Address 730 North 1500 West
Orem, UT, 84057

Source Name Geneva Rock Products- Layton Concrete Batch Plant
Source Location 750 East 3000 North
Layton, UT 84041

UTM Projection 420,048 m Easting, 4,550,482 m Northing
UTM Datum NAD83
UTM Zone UTM Zone 12
SIC Code 3273 (Ready-Mixed Concrete)

Source Contact Grant Ensign
Phone Number [phone]
Email [e-mail]

Billing Contact Grant Ensign
Phone Number [phone]
Email [e-mail]

Project Engineer Dungan Adams, Engineer
Phone Number [phone]
Email [e-mail]

Notice of Intent (NOI) Submitted August 31, 2023
Date of Accepted Application November 6, 2023

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 2
SOURCE DESCRIPTION

General Description
Geneva Rock Products, Inc. operates the Layton Concrete Batch Plant. The facility includes one
(1) central mix concrete batch plant, one (1) truck mix concrete batch plant, one (1) natural gas
water heater, and various conveyors. The plant produces a maximum of 284,500 cubic yards of
concrete per year.

NSR Classification:
Administrative Amendment

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

Applicable Federal Standards
None

Project Proposal
Administrative Amendment to Approval Order DAQE-AN101850011-20, dated October 21,
2020, to Add and Replace a Baghouse under R307-401-12 Reduction in Air Pollutants

Project Description
Geneva Rock has requested to add a baghouse to the Truck Mix Concrete Batch Plant loading
point and replace the current baghouse on the Central Mix Concrete Plant with a baghouse that
has a greater volumetric flow rate.

EMISSION IMPACT ANALYSIS
No changes to emissions are being made and no threshold levels established in R307-410-4 and R307-410-5
are exceeded. Therefore, modeling is not required. [Last updated November 6, 2023]

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 3
SUMMARY OF EMISSIONS

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

Criteria Pollutant Change (TPY) Total (TPY)
CO2 Equivalent 0 5101.00
Carbon Monoxide 0 4.50
Nitrogen Oxides 0 9.13
Particulate Matter - PM10 0 6.06
Particulate Matter - PM2.5 0 6.06
Sulfur Dioxide 0 0.82
Volatile Organic Compounds 0 1.21

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Generic HAPs (CAS #GHAPS) 0 160
Change (TPY) Total (TPY)
Total HAPs 0 0.08

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

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 4
Review of BACT for New/Modified Emission Units

1. BACT review regarding Layton Concrete Batch Plant
The project does not increase the potential to emit of any air pollutant or cause emissions of any
new air pollutant. Therefore, the existing AO DAQE-AN101850011-20 is updated in accordance
with R307-401-12, Reduction in Air Pollutants. This rule does not require a BACT analysis. [Last
updated December 7, 2023]

SECTION I: GENERAL PROVISIONS

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

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

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

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

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

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

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

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

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 5
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 Layton Concrete Batch Plant

II.A.2 Various Storage Tanks
Contents: Fuel Oil, Gasoline, Diesel

II.A.3 One (1) Central Mix Concrete Batch Plant
Three (3) Elevated Cement Silos
One (1) Elevated Fly Ash Silo
Two (2) Sand and Aggregate Storage Silos
One (1) Central Mixer
One (1) Weigh/holding Hopper
One (1) Baghouse (7,500 acfm)
Central Mix Concrete Batch Plant Control: Baghouse

II.A.4 One (1) Truck Mix Concrete Batch Plant
One (1) Elevated Cement Silo
One (1) Elevated Fly Ash Silo
Two (2) Sand and Aggregate Storage Bins
One (1) Weigh Hopper
One (1) Baghouse (6,500 acfm)
Truck Mix Concrete Batch Plant Control: Baghouse and Bin Vents

II.A.5 Various Associated Conveyors

II.A.6 One (1) Natural Gas Water Heater (9.9 MMBtu/hr)
Capacity: 9.9 MMBtu/hr
Low NOx rated

II.A.7 One (1) Front-end Loader
Listed for informational purposes only

II.A.8 Various Mobile Equipment
Listed for informational purposes only

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 6
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 The Layton Concrete Batch Plant shall be subject to the following:
II.B.1.a The owner/operator shall not produce more than 284,500 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]

II.B.1.b
NEW
Unless otherwise specified in this AO, visible emissions from the following emission points
shall not exceed the following values:

A. All conveyor transfer points - 7% opacity

B. All diesel engines - 20% opacity

C. All conveyor drop points - 20% opacity

D. All concrete batch plants - 7% opacity

E. All other points - 20% opacity. [R307-305-3, R307-309-5, R307-312-4, 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. [R307-305-3]

II.B.2 All Haul Roads and Fugitive Dust Sources shall be subject to the following:
II.B.2.a The owner/operator shall comply with a fugitive dust control plan acceptable to the Director
for control of all dust sources associated with the Layton Concrete Batch Plant. [R307-309-6]

II.B.2.b The owner/operator shall not allow visible emissions from haul roads and fugitive dust
sources to exceed 20 % opacity on site and 10% opacity at the property boundary. [R307-309-
5]

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 7
II.B.2.b.1
NEW
The owner/operator shall make visible emission determinations for fugitive dust from haul
roads and operational areas using procedures similar to Method 9. The normal requirement
for observations to be made at 15-second intervals over a six-minute period, however, shall
not apply. Visible emissions shall be measured at the densest point of the plume but at a point
not less than one-half vehicle length behind the vehicle and not less than one-half the height of
the vehicle. [R307-205-4, R307-309-5, R307-401-8]

II.B.2.c The owner/operator shall pave the haul road from the site entrance to the concrete batch plant.
[R307-401-8]

II.B.2.d The owner/operator shall use water application or other control options contained in R307-309
to minimize emissions from fugitive dust and fugitive emissions sources, including haul roads,
storage piles, and disturbed areas. Controls shall be applied to ensure the opacity limits in this
AO are not exceeded. [R307-309, R307-401-8]

II.B.2.d.1
NEW
The owner/operator shall keep records of treatment for all periods when the plant is in
operation. The records shall include the following items:

A. Date of treatment

B. Number of treatments made and quantity

C. Rainfall received, if any, and approximate amount

D. Time of day treatments were made. [R307-401-8]

II.B.3 Baghouse Conditions
II.B.3.a
NEW
The owner/operator shall use a baghouse fabric filter to control emissions from the central mix
concrete batch plant and the truck loading at the truck mix concrete batch plant. [R307-401-8]

II.B.3.b The owner/operator shall install a manometer or magnehelic pressure gauge to measure the
static pressure differential across the baghouse. [R307-401-8]

II.B.3.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.3.b.2 The pressure gauge shall measure the static pressure differential in 1-inch water column
increments or less. [R307-401-8]

II.B.3.c The owner/operator shall maintain the static pressure differential of the baghouse between two
(2) and eleven (11) inches of water column as measured on the pressure gauge, per the
manufacturer recommended range for normal operation. [R307-401-8]

II.B.3.c.1 The owner/operator shall record the static pressure differential at least once per operating day
while the baghouse is operating. [R307-401-8]

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 8
II.B.3.c.2
NEW
The owner/operator shall maintain the following records of the static pressure differential.

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

II.B.3.d.1 The owner/operator shall maintain records of the pressure gauge calibrations and
replacements. [R307-401-8]

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 9
PERMIT HISTORY

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

Supersedes DAQE-AN101850011-20 dated October 21, 2020
Is Derived From NOI dated August 31, 2023
Incorporates Additional Information dated October 17, 2023
Incorporates Additional Information dated October 25, 2023
Incorporates Additional Information dated November 16, 2023

REVIEWER COMMENTS

1. Comment regarding Baghouse Modifications:
GRP is replacing the original 2,400 acfm baghouse on the central mix concrete batch plant (CBP)
with a new 7,500 acfm baghouse. The addition of the larger baghouse will result in a 0.33 TPY
increase in PM10 emissions and a 0.096 TPY increase in PM2.5 emissions. These emission estimates
are calculated using the grain loading, volumetric flow rate, and annual hours of operation of each
baghouse and the particle size distribution of the particulate matter.

GRP is adding a 6,500 acfm baghouse to the loading point of the truck mix CBP. The truck loading
of the CBP was previously uncontrolled. The addition of the baghouse will result in a 5.69 TPY
decrease in PM10 emissions and a 1.67 TPY decrease in PM 2.5 emissions. These emission estimates
are calculated using the truck loading emission factors from Table 11.12-2 of AP-42 Section 11.12.

The overall effect of replacement and addition of baghouses would result in decreases in the site-
wide PTE, the existing AO DAQE-AN101850011-20 is updated in accordance with R307-401-12,
Reduction in Air Pollutants. The baghouse modifications result in a net emission decrease of 5.36
TPY of PM10 and 1.58 TPY of PM2.5. However, since the site-wide PM10 PTE in the existing AO is
6.06 TPY, it is likely the original emission calculations assumed truck loading was controlled, when
it reality it was not. Now that baghouse control is added to the truck loading process, the estimates in
the existing AO more accurately account for PM emissions, and the site-wide PTE will remain
unchanged. [Last updated December 7, 2023]

2. Comment regarding PM2.5 Emissions:
The site-wide PTE of PM2.5 emissions were not included in the previous AO DAQE-AN101850011-
20. For a conservative estimate, the PTE of PM2.5 was set equal to the PTE of PM10 (6.06 tpy). [Last
updated November 9, 2023]

3. Comment regarding Federal Subpart Applicability:
40 CFR 60 NSPS Subpart Dc (Standards of Performance for Small Industrial-Commercial-
Institutional Steam Generating Units) applies to steam generating units with a maximum heat input
capacity of 100 MMBtu/hr or less, but greater than or equal to 10 MMBtu/hr. The applicability date
for NSPS Subpart Dc is June 9, 1989. The boiler at this facility is less than 10 MMBTU/hr.
Therefore, this source is not subject to this subpart.

40 CFR 63 MACT Subpart JJJJJJ (National Emission Standards for Hazardous Air Pollutants for
Industrial, Commercial, and Institutional Boilers Area Sources) applies to industrial, commercial, or
institutional boilers located in an area source for HAPs. This subpart only applies to boilers that burn
coal, biomass, oil or other liquid fuel, and non-waste material. Gas-fired boilers are not subject to

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 10
this rule. The boiler at this facility only burns natural gas and therefore is not subject to this subpart.
[Last updated December 7, 2023]

4. Comment regarding Title V Applicability:
Title V of the 1990 Clean Air Act (Title V) applies to the following:

1. Any major source
2. Any source subject to a standard, limitation, or other requirement under Section 111 of the Act,
Standards of Performance for New Stationary Sources;
3. Any source subject to a standard or other requirement under Section 112 of the Act, Hazardous
Air Pollutants.
4. Any Title IV affected source.

This facility is not a major source and is not a Title IV source. This facility is not subject to 40 CFR
60 (NSPS), 40 CFR 61 (NESHAP), or 40 CFR 63 (MACT) Subpart ZZZZ regulations. Therefore,
Title V does not apply to this facility. [Last updated December 7, 2023]

Engineer Review N101850012: Geneva Rock Products- Layton Concrete Batch Plant
December 7, 2023
Page 11
ACRONYMS
The following lists commonly used acronyms and associated translations as they apply to this
document:
40 CFR Title 40 of the Code of Federal Regulations
AO Approval Order
BACT Best Available Control Technology
CAA Clean Air Act
CAAA Clean Air Act Amendments
CDS Classification Data System (used by EPA to classify sources by size/type)
CEM Continuous emissions monitor
CEMS Continuous emissions monitoring system
CFR Code of Federal Regulations
CMS Continuous monitoring system
CO Carbon monoxide
CO2 Carbon Dioxide
CO2e Carbon Dioxide Equivalent - 40 CFR Part 98, Subpart A, Table A-1
COM Continuous opacity monitor
DAQ/UDAQ Division of Air Quality
DAQE This is a document tracking code for internal UDAQ use
EPA Environmental Protection Agency
FDCP Fugitive dust control plan
GHG Greenhouse Gas(es) - 40 CFR 52.21 (b)(49)(i)
GWP Global Warming Potential - 40 CFR Part 86.1818-12(a)
HAP or HAPs Hazardous air pollutant(s)
ITA Intent to Approve
LB/HR Pounds per hour
LB/YR Pounds per year
MACT Maximum Achievable Control Technology
MMBTU Million British Thermal Units
NAA Nonattainment Area
NAAQS National Ambient Air Quality Standards
NESHAP National Emission Standards for Hazardous Air Pollutants
NOI Notice of Intent
NOx Oxides of nitrogen
NSPS New Source Performance Standard
NSR New Source Review
PM10 Particulate matter less than 10 microns in size
PM2.5 Particulate matter less than 2.5 microns in size
PSD Prevention of Significant Deterioration
PTE Potential to Emit
R307 Rules Series 307
R307-401 Rules Series 307 - Section 401
SO2 Sulfur dioxide
Title IV Title IV of the Clean Air Act
Title V Title V of the Clean Air Act
TPY Tons per year
UAC Utah Administrative Code
VOC Volatile organic compounds

9/15/23, 9:29 AM State of Utah Mail - Fwd: Geneva Rock Products: Layton CBP - Administrative Amendment to AO
https://mail.google.com/mail/u/0/?ik=c52f18613a&view=pt&search=all&permthid=thread-f:1777037792918703432&simpl=msg-f:1777037792918703432 1/2
Dungan Adams <[e-mail]>
Fwd: Geneva Rock Products: Layton CBP - Administrative Amendment to AO
1 message
Alan Humpherys <[e-mail]>Thu, Sep 14, 2023 at 12:14 PM
To: Dungan Adams <[e-mail]>
Dungan,
Can you please process this administrative amendment?
Site ID: 10185
Peer: EQ
Thanks,
Alan
---------- Forwarded message ---------
From: Grant Ensign <[e-mail]>
Date: Thu, Aug 31, 2023 at 2:11 PM
Subject: Geneva Rock Products: Layton CBP - Administrative Amendment to AO
To: Alan Humpherys ([e-mail]) <[e-mail]>
Hi Alan,
Please see Geneva Rock's request to amend the AO at their Layton facility.
Thanks!
Clyde
Companies
Grant Ensign
ENVIRONMENTAL SPECIALIST
O [phone] 
C [phone]
WWW.CLYDEINC.COM

--
Alan Humpherys
Manager | Minor NSR Section
P: [phone]
F: [phone]
airquality.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
3 attachments
9/15/23, 9:29 AM State of Utah Mail - Fwd: Geneva Rock Products: Layton CBP - Administrative Amendment to AO
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GRP. Layton. 8.31.23. Adminstrative Amendment to AO.pdf
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31 August 2023 

Utah Department of Environmental Quality
Division of Air Quality
Alan Humpherys
150 North 1950 West
Salt Lake City, Utah 84115

Subject: Geneva Rock Products, Inc.
Request for Amendment
Approval Order (DAQE-AN101850011-20)
Layton Concrete Batch Plant
Layton, Utah

Dear Alan Humpherys,

Geneva Rock Products, Inc. (Geneva Rock) is currently replacing a baghouse on the Central
Mix Concrete Batch Plant (CBP) and previously upgraded the Truck Mix Concrete Batch Plant
by adding a baghouse at their Layton facility. Geneva Rock’s Layton facility is located at 750
East 3000 North, Layton, UT 84041, and operates under air quality permit DAQE-
AN101850011-20.
With the updated baghouses, the released emissions will remain the same or be reduced and
as a result, Geneva Rock is requesting that the existing permit be amended as
“administrative” under R307-401-12.
Since January 2023, the Central Mix CBP has been under construction and inoperable. The
new baghouse on this plant will be installed by the end of 2024. A baghouse was also added
to the Truck Mix CBP in October 2022 (This is our notice that this was constructed). The bin
vents on top of the storage silos at the Truck Mix CBP were not removed but remain in place
to control fugitive dust during loading of the silos. However, a baghouse was added to help
control additional fugitive dust during unloading (also known as “load out”) when water,
cement, fly ash, aggregates, and additives are added to the cement truck drum for mixing. By
incorporating another dust control device, additional fugitive dust is being captured that
otherwise wouldn’t be, therefore, the emissions for this condition will remain equal to or
below the current permit PTE which meets the “administrative” amendment requirement.
The following table shows information about the old equipment and new baghouses:
Plant Baghouse ACFM Manufacturer/Model Notes
Central Mix
CBP Original 2,400 W.W. Sly
Manufacturing/PC-105
Removed from the site
in January 2023.
Central Mix
CBP New 7,500 C&W/CP7500 Will be installed by the
end of 2023.
Truck Mix
CBP New 6,500 R&S/6500
A pressurized baghouse
filters emissions during
loadout when concrete
ingredients are added to
a cement truck.

Geneva Rock is requesting that permit items II.A.3 and II.A.4 be updated to reflect these
changes. The following visuals reflect the requested changes from the existing Approval Order
to an updated Approval Order:
Existing AO “DAQE-AN101850011-20”

Requested Changes to new AO

Geneva Rock appreciates the opportunity to submit this request to amend the permit. Please
reach out should you have any questions.

Grant Ensign
[e-mail]
Environmental Specialist
Clyde Companies
(7,500 acfm) 
One (1) Baghouse (6,500 acfm)