DAQ-2025-001524

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DAQC-283-25
Site ID 10028 (B1)

MEMORANDUM

TO: FILE – VULCRAFT – Division of Nucor Corporation

THROUGH: Harold Burge, Major Source Compliance Section Manager

FROM: Joe Rockwell Environmental Scientist

DATE: March 3, 2025

SUBJECT: FULL COMPLIANCE EVALUATION, Major, Box Elder County,
FRS ID #UT0000004900300030

INSPECTION DATE: February 27, 2025

SOURCE ADDRESS: 1875 West Highway 13 South
Brigham City, Utah 84302

MAILING ADDRESS: Vulcraft - Division of Nucor Corporation
P.O. Box 637
Brigham City, Utah 84302-0637

SOURCE CONTACT: Trevette Kuester, Environmental Coordinator: 435-279-4921
[e-mail]

Timaree Phillips, EHS Administrator: 435-734-4441

Kurt Robinette, Environmental Coordinator (Nucor Building System):
435-919-3140, Cell: 435-740-1187
[e-mail]

Mason Timithy, EHS Coordinator (Truecore Insulated Panel Building):
435-720-7049
mason.tmithy@nucor..com

Casey Christiansen, PE Safety, Quality & Environmental Supervisor
(Nucor Cold Finish/Wire Products-Utah)
Cell: 801-413-8872
[e-mail]

OPERATING STATUS: Operating

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PROCESS DESCRIPTION:

Vulcraft produces finished steel structural building materials at this plant. Most of the raw materials comes
from its parent plant Nucor Steel in Plymouth, Utah.

There are several processes that are performed at this plant. The specific processes are as follows:

Cold Finishing: The cold finishing plant uses a wire line process to produce cold drawn steel bars. The
wire material is pulled through a sizing die, straightened, and cut. Dust from the wire line is controlled by a
2,112 scfm dust collector. The baghouse at this plant vents outside the building and into the atmosphere.
The stack from the wire line baghouse vents out of the south roof of the main production building. The
source has a 5% opacity limit for emissions and 20% for fugitive emissions. Also, VOC consumption is
limited.

Joist Plant: The joist plant produces structural beams and weight bearing ceiling joists used in a variety of
building construction applications. There are five different production lines at the joist plant. They are the
miniature span line, the short span line, the long span line, the bridging line, and the super long span line.
Raw materials received from Nucor Steel include steel angles, rods, and bars. This material is received by
rail car and stacked in the receiving and storage area of the joist plant. The pieces are cut, sheared, and bent
to form the right component dimensions for joist rigging. The cut parts are conveyed to the rigging area
where they are arranged on a rigging table to fit the final form and tack welded to secure the shape. The
preassembled joist is then conveyed to the welding area where the parts are permanently arc welded
together, inspected, and repaired if necessary.

The completed joists are then conveyed to the inspection and painting department. Overhead Gantry cranes
lift the completed joists from the conveyor and dip them into long, narrow, dip tanks filled with gray paint.
The coated joist is stacked on a drying rack and tipped to drip dry. After drying, the joists are loaded onto a
trailer for shipment and storage in the yard area. Forklifts are used to stack the completed joists in storage
areas. There are a total of seven dip tanks in the facility. The VOC emissions are controlled over the dip
tanks by closing lids while they are not in use. The welding smoke inside of the building is ventilated by 24
electric exhaust fans, which vent outside to the atmosphere.

Built-up Line: Columns and joists are fabricated from tubular steel and flat steel products. These pieces
are assembled into structural shapes whose dimensions and exact shape are dictated by customer needs and
engineering principles. Flat products are in the form of bars, plates, and flattened pieces of slit steel coils.
Pieces of these built up parts are cut by shears, saws, and plasma cutters. They are joined together through
both automated and manual welding systems. The parts are moved around the assembly portion of the plant
by small overhead conveyor systems, roller conveyors, as well as by hand, and by wheeled carts. The
built-up parts are then conveyed by overhead conveyor through two back-to-back paint booths. The booths
are slotted at the top to allow the passage of hooks extending downward from the overhead conveyor. The
openings to each booth, “A” and “B”, face opposite directions. This allows the parts to be spray painted
from one side in the first booth, and then from the opposite sides in the second booth. The open side of the
booth allows access by the painter, who uses a high efficiency spray gun to apply the paint. The painter
sprays paint onto the part as it moves past on the overhead conveyor. The direction of the spray is toward
the side of the booth opposite the access opening, and which contains the filter system. Behind the filter is
the ductwork that leads to the air blower. There is one air blower for each booth. The discharge from each
blower exits through the roof, and are designated as Stacks 1A and 1B. The painted parts are then conveyed
through a natural gas-fired drying oven, also slotted at the top to allow the passage of hooks extending
downward from the overhead conveyors. This stack is designated as Stack 1C. The dried parts are then
removed from the conveyor hooks and stacked for shipping.

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Purlin Line: Purlins are structural parts that are formed from coiled steel of various widths and
thicknesses. Purlins are used to bridge between rafters for the roof, as rafters themselves are used as girds
to bridge between columns for side walls. Metal siding and metal roofing can be attached to the purlins.
The parts are produced from slit steel coils and are then roll-formed into either a “C” or “Z” cross section,
and are called “cees” and “zees”. After roll-forming, the parts are fed by roller conveyors through a
“flow-coater”, which uses a vacuum to cause paint to fill a chamber through which the part travels. Each
site of this chamber has an orifice cut in the same shape as the object being painted. This allows for a very
tight tolerance and facilitates the efficient transfer of paint unto the part. The vacuum is produced by an air
blower that exhausts through the roof via Stack No. 2. After being coated with paint, the purlins are then
fed by roller conveyor into a separate natural gas-fired drying oven. The exhaust from the oven exits
through the roof of the building via Stack No. 3. The dried purlins are then removed from the oven by
conveyor belts, and stacked for shipping.

Rod Coater: Threaded steel rods are used for bracing of structural components in the finished buildings.
The rods are fed through a small flow coater, which uses a vacuum to cause paint to fill a chamber through
which the part travels. Each site of this chamber has an orifice cut in the same shape as the object being
painted. This allows for a very tight tolerance and facilitates the efficient transfer of paint unto the part. The
vacuum is produced by an air blower that exhausts through the roof via Stack No. 4. After the parts exit the
flow coater, they are then allowed to air-dry in the plant on racks, and are then stacked for shipping.

Accessory Dip Coating: Small pieces and miscellaneous parts are used throughout the finished building
product. These pieces are hand-dipped in a small paint tank, and then hung onto an overhead conveyor that
moves the parts to a nearby area where the parts are air-dried. The emissions produced from the paint are
fugitive, and are not vented outside of the building through any stack. The dried parts are then removed
from the conveyor hooks, and stacked for shipping.

Metal Roofing and Metal Siding Panel Forming: Building side panels and roofing are formed from
prepainted or galvanized coiled steel, which are roll-formed into the finished shape. The joint seam of the
standing seam line of roofing panels are coated with a thin stream of an elastomeric compound. This
compound contains VOCs. A highly evaporative lubricant is used to protect the finish of some of the
panels. This lubricant also produces some VOCs. The emissions produced from both of these sources are
fugitive, and are not vented outside of the building through any stack. The panels are then removed from
the roller conveyors, and stacked for shipping.

Foam-1 Line (Insulated Panel): The insulated panel is used for interior/exterior walls, and for roof panels.
Steel coils are fed through a continuous line and roll formed. A foam insulation is poured between the two
pieces of steel and it then enters a double belt laminator for curing. Panels then enter an inline saw where
they are cut to length. Foam insulation line that vents through the FOAM-1 stack. Includes double belt
laminator and cross-cut/edge trimming saws controlled by the DC-01 baghouse. After the panel leaves the
saw house it enters a cooling rack, it is stacked into bundles, and wrapped for packaging/shipping.”

APPLICABLE REGULATIONS: Title V Permit # 300030005, dated November 9, 2023, and
revised March 12 2024

40 CFR 60 Subpart A-General Provision
40 CFR 60 Subpart JJJJ-NSPS for Stationary Spark Ignition
Internal Combustion Engines
40 CFR 63 Subpart A-General Provision
40 CFR 63 Subpart ZZZZ-NESHAP for Stationary RICE
40 CFR 63 Subpart XXXXXX-NESHAP Area Source Standards
for Nine Metal Fabrication and Finishing Source Categories
40 CFR 63 Subpart CCCCCC-NESHAP Gasoline Dispensing
Facilities
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SOURCE EVALUATION:

SECTION I: GENERAL PROVISIONS

I.A Federal Enforcement.

Status:
All terms and conditions in this permit, including those provisions designed to limit the
potential to emit, are enforceable by the EPA and citizens under the Clean Air Act of 1990
(CAA) except those terms and conditions that are specifically designated as "State
Requirements". (R307-415-6b)

This is a statement of fact and not an inspection item.

I.B Permitted Activity(ies).

Except as provided in R307-415-7b(1), the permittee may not operate except in
compliance with this permit. (See also Provision I.E, Application Shield)

Status:

In compliance – The facility appeared to be operating in compliance, with this permit, at time
of the inspection. See the permitted conditions, below, for details.
I.C Duty to Comply.

I.C.1 The permittee must comply with all conditions of the operating permit. Any permit
noncompliance constitutes a violation of the Air Conservation Act and is grounds for any of
the following: enforcement action; permit termination; revocation and reissuance;
modification; or denial of a permit renewal application. (R307-415-6a(6)(a))

I.C.2 It shall not be a defense for a permittee in an enforcement action that it would have been
necessary to halt or reduce the permitted activity in order to maintain compliance with the
conditions of this permit. (R307-415-6a(6)(b))

I.C.3 The permittee shall furnish to the Director, within a reasonable time, any information that
the Director may request in writing to determine whether cause exists for modifying,
revoking and reissuing, or terminating this permit or to determine compliance with this
permit. Upon request, the permittee shall also furnish to the Director copies of records
required to be kept by this permit or, for information claimed to be confidential, the
permittee may furnish such records directly to the EPA along with a claim of
confidentiality. (R307-415-6a(6)(e))

I.C.4

This permit may be modified, revoked, reopened, and reissued, or terminated for cause. The
filing of a request by the permittee for a permit modification, revocation and reissuance, or
termination, or of a notification of planned changes or anticipated noncompliance shall not
stay any permit condition, except as provided under R307-415-7f(1) for minor permit
modifications. (R307-415-6a(6)(c))

Status: In compliance – The source provided records and appeared to be complying with the permit
at time of the inspection. See status of condition I.B.

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I.D Permit Expiration and Renewal.

I.D.1 This permit is issued for a fixed term of five years and expires on the date shown under
"Enforceable Dates and Timelines" at the front of this permit. (R307-415-6a(2))

I.D.2 Application for renewal of this permit is due on or before the date shown under
"Enforceable Dates and Timelines" at the front of this permit. An application may be
submitted early for any reason. (R307-415-5a(1)(c))

I.D.3 An application for renewal submitted after the due date listed in I.D.2 above shall be
accepted for processing, but shall not be considered a timely application and shall not
relieve the permittee of any enforcement actions resulting from submitting a late
application. (R307-415-5a(5))

I.D.4

Permit expiration terminates the permittee's right to operate unless a timely and complete
renewal application is submitted consistent with R307-415-7b (see also Provision I.E,
Application Shield) and R307-415-5a(1)(c) (see also Provision I.D.2). (R307-415-7c(2))
Status: In compliance – The permit expires on November 9, 2028. Application for renewal is due by
May 9, 2028.

I.E Application Shield.

If the permittee submits a timely and complete application for renewal, the permittee's
failure to have an operating permit will not be a violation of R307-415, until the Director
takes final action on the permit renewal application. In such case, the terms and conditions
of this permit shall remain in force until permit renewal or denial. This protection shall
cease to apply if, subsequent to the completeness determination required pursuant to R307-
415-7a(3), and as required by R307-415-5a(2), the applicant fails to submit by the deadline
specified in writing by the Director any additional information identified as being needed to
process the application. (R307-415-7b(2))
Status: In compliance – Application for renewal is due May 9, 2028.

I.F Severability.

In the event of a challenge to any portion of this permit, or if any portion of this permit is
held invalid, the remaining permit conditions remain valid and in force. (R307-415-6a(5))
Status: This is a statement of fact and not an inspection item.

I.G Permit Fee.

I.G.1 The permittee shall pay an annual emission fee to the Director consistent with R307-415-9.
(R307-415-6a(7))

I.G.2

The emission fee shall be due on October 1 of each calendar year or 45 days after the source
receives notice of the amount of the fee, whichever is later. (R307-415-9(4)(a))

Status: In compliance – The annual emission fee invoice payment was made on time. See attached
emails.

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I.H No Property Rights.

This permit does not convey any property rights of any sort, or any exclusive privilege.
(R307-415-6a(6)(d))

Status: This is a statement of fact and not an inspection item.

I.I Revision Exception.

No permit revision shall be required, under any approved economic incentives, marketable
permits, emissions trading and other similar programs or processes for changes that are
provided for in this permit. (R307-415-6a(8))

Status: This is a statement of fact and not an inspection item.

I.J Inspection and Entry.

I.J.1 Upon presentation of credentials and other documents as may be required by law, the
permittee shall allow the Director or an authorized representative to perform any of the
following:

I.J.1.a Enter upon the permittee's premises where the source is located or emissions related
activity is conducted, or where records are kept under the conditions of this permit.
(R307-415-6c(2)(a))

I.J.1.b Have access to and copy, at reasonable times, any records that must be kept under
the conditions of this permit. (R307-415-6c(2)(b))

I.J.1.c Inspect at reasonable times any facilities, equipment (including monitoring and air
pollution control equipment), practice, or operation regulated or required under this
permit. (R307-415-6c(2)(c))

I.J.1.d Sample or monitor at reasonable times substances or parameters for the purpose of
assuring compliance with this permit or applicable requirements.
(R307-415-6c(2)(d))

I.J.2

Any claims of confidentiality made on the information obtained during an inspection shall
be made pursuant to Utah Code Ann. Section 19-1-306. (R307-415-6c(2)(e))

Status: In compliance – Required records were made available and no claims of confidentially were
made at time of the inspection.

I.K Certification.

Any application form, report, or compliance certification submitted pursuant to this permit
shall contain certification as to its truth, accuracy, and completeness, by a responsible
official as defined in R307-415-3. This certification shall state that, based on information
and belief formed after reasonable inquiry, the statements and information in the document
are true, accurate, and complete. (R307-415-5d)
Status: In compliance – Reports and certifications submitted, by the facility, appeared to have
certification statements and were signed by responsible officials (ROs).

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I.L Compliance Certification.

I.L.1 Permittee shall submit to the Director an annual compliance certification, certifying
compliance with the terms and conditions contained in this permit, including emission
limitations, standards, or work practices. This certification shall be submitted no later than
the date shown under "Enforceable Dates and Timelines" at the front of this permit, and that
date each year following until this permit expires. The certification shall include all the
following (permittee may cross-reference this permit or previous reports): (R307-415-6c(5))

I.L.1.a The identification of each term or condition of this permit that is the basis of the
certification;

I.L.1.b The identification of the methods or other means used by the permittee for
determining the compliance status with each term and condition during the
certification period. Such methods and other means shall include, at a minimum, the
monitoring and related recordkeeping and reporting requirements in this permit. If
necessary, the permittee also shall identify any other material information that must
be included in the certification to comply with section 113(c)(2) of the Act, which
prohibits knowingly making a false certification or omitting material information;

I.L.1.c The status of compliance with the terms and conditions of the permit for the period
covered by the certification, including whether compliance during the period was
continuous or intermittent. The certification shall be based on the method or means
designated in Provision I.L.1.b. The certification shall identify each deviation and
take it into account in the compliance certification. The certification shall also
identify as possible exceptions to compliance any periods during which compliance
is required and in which an excursion or exceedance as defined under 40 CFR Part
64 occurred; and

I.L.1.d Such other facts as the Director may require to determine the compliance status.

I.L.2

The permittee shall also submit all compliance certifications to the EPA, Region VIII, at the
following address or to such other address as may be required by the Director: (R307-415-
6c(5)(d))

Environmental Protection Agency, Region VIII
Office of Enforcement, Compliance and Environmental Justice
(mail code 8ENF)
1595 Wynkoop Street
Denver, CO 80202-1129
Status: In compliance – The initial annual compliance certification, for report period January 1, 2024
– December 31, 2024, was received on the due date, February 12, 2025. The report has been
revised to include the deviation mentioned in the six-month monitoring report for report
period July 1, 2024 – December 31, 2024, regarding noncompliance with condition
II.B.10.c(2). The revised annual compliance certification was deemed acceptable after being
received on March 10, 2025. See status of condition I.S.2.c and Compliance Assistance below.

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I.M Permit Shield.

I.M.1 Compliance with the provisions of this permit shall be deemed compliance with any
applicable requirements as of the date of this permit, provided that:

I.M.1.a Such applicable requirements are included and are specifically identified in this
permit, or (R307-415-6f(1)(a))

I.M.1.b Those requirements not applicable to the source are specifically identified and listed
in this permit. (R307-415-6f(1)(b))

I.M.2 Nothing in this permit shall alter or affect any of the following:

I.M.2.a The emergency provisions of Utah Code Ann. Section 19-1-202 and Section 19-2-
112, and the provisions of the CAA Section 303. (R307-415-6f(3)(a))

I.M.2.b The liability of the owner or operator of the source for any violation of applicable
requirements under Utah Code Ann. Section 19-2-107(2)(g) and Section 19-2-110
prior to or at the time of issuance of this permit. (R307-415-6f(3)(b)

I.M.2.c The applicable requirements of the Acid Rain Program, consistent with the CAA
Section 408(a). (R307-415-6f(3)(c))

I.M.2.d

The ability of the Director to obtain information from the source under Utah Code
Ann. Section 19-2-120, and the ability of the EPA to obtain information from the
source under the CAA Section 114. (R307-415-6f(3)(d))

Status: N/A – See section III of this permit.

I.N Reserved.

I.O Operational Flexibility.

Operational flexibility is governed by R307-415-7d(1).

I.P Off-permit Changes.

Off-permit changes are governed by R307-415-7d(2).

I.Q Administrative Permit Amendments.

Administrative permit amendments are governed by R307-415-7e.

I.R Permit Modifications.

Permit modifications are governed by R307-415-7f.
Status: These are statements of fact and not inspection items (I.O through I.R).

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I.S Records and Reporting.

I.S.1 Records.

I.S.1.a The records of all required monitoring data and support information shall be
retained by the permittee for a period of at least five years from the date of the
monitoring sample, measurement, report, or application. Support information
includes all calibration and maintenance records, all original strip-charts or
appropriate recordings for continuous monitoring instrumentation, and copies of all
reports required by this permit. (R307-415-6a(3)(b)(ii))

I.S.1.b For all monitoring requirements described in Section II, Special Provisions, the
source shall record the following information, where applicable: (R307-415-
6a(3)(b)(i))

I.S.1.b.1 The date, place as defined in this permit, and time of sampling or
measurement.

I.S.1.b.2 The date analyses were performed.

I.S.1.b.3 The company or entity that performed the analyses.

I.S.1.b.4 The analytical techniques or methods used.

I.S.1.b.5 The results of such analyses.

I.S.1.b.6 The operating conditions as existing at the time of sampling or
measurement.

I.S.1.c

Additional record keeping requirements, if any, are described in Section II, Special
Provisions.

Status: In compliance – Required records were provided at time of the inspection. See status of
condition I.J.

I.S.2 Reports.

I.S.2.a Monitoring reports shall be submitted to the Director every six months, or more
frequently if specified in Section II. All instances of deviation from permit
requirements shall be clearly identified in the reports. (R307-415-6a(3)(c)(i))

I.S.2.b All reports submitted pursuant to Provision I.S.2.a shall be certified by a
responsible official in accordance with Provision I.K of this permit. (R307-415-
6a(3)(c)(i)

I.S.2.c The Director shall be notified promptly of any deviations from permit requirements
including those attributable to upset conditions as defined in this permit, the
probable cause of such deviations, and any corrective actions or preventative
measures taken. Prompt, as used in this condition, shall be defined as written
notification within the number of days shown under "Enforceable Dates and
Timelines" at the front of this permit. Deviations from permit requirements due to
breakdowns shall be reported in accordance with the provisions of R307-107.
(R307-415-6a(3)(c)(ii))
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I.S.3 Notification Addresses.

I.S.3.a All reports, notifications, or other submissions required by this permit to be
submitted to the Director are to be sent to the following address or to such other
address as may be required by the Director:

Utah Division of Air Quality
P.O. Box 144820
Salt Lake City, UT 84114-4820
Phone: [phone]

I.S.3.b

All reports, notifications or other submissions required by this permit to be
submitted to the EPA should be sent to one of the following addresses or to such
other address as may be required by the Director:

For annual compliance certifications:

Environmental Protection Agency, Region VIII
Office of Enforcement, Compliance and Environmental Justice
(mail code 8ENF)
1595 Wynkoop Street
Denver, CO 80202-1129

For reports, notifications, or other correspondence related to permit modifications,
applications, etc.:

Environmental Protection Agency, Region VIII
Air Permitting and Monitoring Branch (mail code 8ARD-PM)
1595 Wynkoop Street
Denver, CO 80202-1129
Phone: [phone]

Status: In compliance – The required six-month monitoring reports, have been submitted, for report
periods January 1, 2024 – June 30, 2024, and July 1, 2024 – December 31, 2024. The reports
were deemed acceptable.

The latest deviation notice was received on December 14, 2024. The deviation notice explains
the deviation that occurred on October 24, 2024 – October 29, 2024, regarding condition
II.B.10.c(2). The report was not received within 14 days of the deviation; however, it is
considered to have been received within a reasonable time. See status of conditions I.L.1 and
Compliance Assistance below.

I.T Reopening for Cause.

I.T.1 A permit shall be reopened and revised under any of the following circumstances:

I.T.1.a New applicable requirements become applicable to the permittee and there is a
remaining permit term of three or more years. No such reopening is required if the
effective date of the requirement is later than the date on which this permit is due to
expire, unless the terms and conditions of this permit have been extended pursuant
to R307-415-7c(3), application shield. (R307-415-7g(1)(a))

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I.T.1.b The Director or EPA determines that this permit contains a material mistake or that
inaccurate statements were made in establishing the emissions standards or other
terms or conditions of this permit. (R307-415-7g(1)(c))

I.T.1.c EPA or the Director determines that this permit must be revised or revoked to
assure compliance with applicable requirements. (R307-415-7g(1)(d))

I.T.1.d Additional applicable requirements are to become effective before the renewal date
of this permit and are in conflict with existing permit conditions.
(R307-415-7g(1)(e))

I.T.2 Additional requirements, including excess emissions requirements, become applicable to a
Title IV affected source under the Acid Rain Program. Upon approval by EPA, excess
emissions offset plans shall be deemed to be incorporated into this permit.
(R307-415-7g(1)(b))

I.T.3

Proceedings to reopen and issue a permit shall follow the same procedures as apply to initial
permit issuance and shall affect only those parts of this permit for which cause to reopen
exists. (R307-415-7g(2))

Status: Permit reopening’s are handled by DAQ’s engineering branch.

I.U Inventory Requirements.

An emission inventory shall be submitted in accordance with the procedures of R307-150,
Emission Inventories. (R307-150)

Status: In compliance – According to Vulcraft and the SLEIS database the emission inventories are
required to be submitted tri-annually. The 2023 emission inventory was received by the
UDAQ on April 12, 2024. The source is required to submit their 2026 emission inventory
before or by April 15, 2027. See the SLEIS database and Emission Inventory below.

I.V Title IV and Other, More Stringent Requirements

Where an applicable requirement is more stringent than an applicable requirement of
regulations promulgated under Title IV of the Act, Acid Deposition Control, both
provisions shall be incorporated into this permit. (R307-415-6a(1)(b))

Status: This is determined during the NOI/permitting process.

SECTION II: SPECIAL PROVISIONS

II.A Emission Unit(s) Permitted to Discharge Air Contaminants.
(R307-415-4(3)(a) and R307-415-4(4))

II.A.1 Permitted Source
Source-wide.

II.A.2 Coil Line Dust Collector (Baghouse) - Cold Finish Plant
Dust Collector (Baghouse) controlling emissions from the Coil Line. Maximum Airflow of
5,500 scfm. Located at the Vulcraft Site.

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II.A.3 Bar Line Dust Collector (Baghouse) - Cold Finish Plant
Dust Collector (Baghouse) controlling emissions from the Bar line. Maximum Airflow of
16,000 scfm. Located at the Vulcraft Site.

II.A.4 Wire Line Baghouse (Dust Collector) - Cold Finish Plant
Baghouse (Dust Collector) controlling emissions from the Wire Line. Maximum Airflow of
2,800 scfm. Located at the Vulcraft Site.
II.A.5 Wet Plasma Cutter Table - Cold Finish Plant
Plasma steel cutter utilizing a water table to control fumes.

II.A.6 Eight (8) Surface Coating Dip Tanks - Joist Plant
Eight (8) dip tanks at the Joist Plant which includes one (1) new dip tank at the Mini-Joist
Line. Dip tanks have covers that can be closed when not in use.

II.A.7 Bridging Paint Line System - Joist Plant
One (1) electric oven and enclosed paint spray box.

II.A.8 One (1) Structural Products Plasma Cutter - Joist Plant
One (1) plasma steel cutter utilizing a water table to control fumes.

II.A.9 One (1) Steel Grating Plasma Cutter - Joist Plant
Steel grating plasma cutter. Emissions shall be routed to a baghouse prior to venting. Unit is
located inside of the Joist Plant building and does not vent to the atmosphere.

II.A.10 One (1) Baseplate Processor - Joist Plant
Dry Plasma cutter. Emissions shall be routed to a baghouse prior to venting. The baghouse
operates inside of the Joist Plant building and does not vent to the atmosphere.

II.A.11 One (1) Steel Grating Dip Tank - Joist Plant
Open-topped dip tank with cover that shall be closed when not in use.

II.A.12 Four (4) Make Up Air Heaters - Joist Plant
Four (4) natural gas make-up air heaters. Rated maximum of 6.48 MMBtu/hr each.

II.A.13 One (1) Emergency Engine - Joist Plant
One (1) natural gas/propane emergency engine with a rating of 150 kW. Subject to 40 CFR
60 Subpart JJJJ and 40 CFR 63 Subpart ZZZZ.

II.A.14 Beam Line - Joist Plant
Beam line that includes structural dry plasma table. Emissions shall be routed to a baghouse
prior to venting. The baghouse operates inside of a building and does not vent to the
atmosphere.

II.A.15 Two (2) Plasma Steel Cutters - Built Up Line - Nucor Building Systems
Plasma steel cutters utilizing a water table to control fumes located at Nucor Building
Systems.

II.A.16 Two (2) Spray Booths - Built Up Line - Nucor Building Systems
Two (2) separate spray booth bays each (4 bays total). Each bay vents to exhaust stacks and
is controlled by an air collection system and fabric filters.

13

II.A.17 Two (2) Drying Ovens - Built Up Line - Nucor Building Systems
Two (2) coating drying ovens located at the Nucor Building Systems. Maximum ratings: 3.0
million BTU/hour and 4.1 MMBtu/hr. Only natural gas or propane shall be used as a fuel in
the drying ovens.

II.A.18 Flange Line - Nucor Building Systems
Flange line including plasma bevel preparation dry plasma cutter. Controlled by dust and
fume collection system. The baghouse operates inside of the Nucor Building Systems
building and does not vent to the atmosphere.

II.A.19 Purlin Line - Nucor Building Systems
Roll-forming equipment. Flow Coater - Application type: Automated/vacuum.

II.A.20 One (1) Shot Blaster - Nucor Building Systems
Abrasive blaster controlled by a baghouse located at Nucor Building Systems. The baghouse
operates inside of the Nucor Building Systems building and does not vent to the atmosphere.

II.A.21 One (1) Purlin Line Drying Oven - Nucor Building Systems
Coating drying oven located at Nucor Building Systems. Rated capacity approximately 4.5
million BTU/hour. Only natural gas or propane shall be used as a fuel in the drying oven.

II.A.22 Rod Line - Nucor Building Systems
Flow coater line - Application type: Automated/vacuum. Located at Nucor Building
Systems.

II.A.23 Accessory Dip Coating - Nucor Building Systems
Two (2) open-topped dip tanks with covers that shall be closed when not in use located at
Nucor Building Systems.

II.A.24 Metal Roofing and Siding Panel Forming - Nucor Building Systems
Various automated panel and trim roll forming equipment. Incorporates highly evaporative
lubricant application equipment. Located at Nucor Building Systems.

II.A.25 Two (2) Mastic-Application Roll Formers - Nucor Building Systems
Two (2) mastic-application roll formers located at Nucor Building Systems.

II.A.26 FOAN-1 Line – Truecore Insulated Panels Building
Foam insulation line that vents through the FOAM-1 stack. Includes double belt laminator
and cross-cut/edge trimming saws controlled by the DC-01 baghouse which has a maximum
air flow of 3,800 cfm

II.A.27 Corona Treatment Machine -TrueCore Insulated Panel Building
High voltage coil treatment machine Electrically powered. The unit operates inside of the
Truecore Insulated Panels Building and does not vent to the atmosphere. No unit specific
applicable requirements.

II.A.28 Mastic Applicator – TrueCore Insulated Panels Building
Mastic applicator that vents inside the building. No unit specific
applicable requirements.

14

II.A.29 Miscellaneous Tanks – TrueCore Insulated Panels Building
Miscellaneous tanks including one (1) n-Pentane Tank (12,200 gallons each), two (2) MDI
Tanks (8,000 gallons each), and two (2) Polyol Tanks (8,000 gallons each). Located at
TrueCore Insulated Panels Building. No unit specific applicable requirements.

II.A.30 Handheld Plasma Cutters - Source-Wide
Handheld Plasma cutters located source-wide.

II.A.31 Welding Stations - Source-Wide
Multiple welding stations located source-wide.

II.A.32 Fuel Tanks - Source-Wide
Outdoor gasoline and diesel fuel storage tanks located source-wide.

II.A.33 Compressor Buildings - Source-Wide
Compressor buildings located source-wide including at Joist Plant and Nucor Building
Systems. Miscellaneous powered and non-powered exhaust vents.

II.A.34 Miscellaneous Parts Washers - Source-Wide
Miscellaneous parts washers located source-wide.

II.A.35 Miscellaneous Spray-Painting Equipment - Source-Wide
Spray painting equipment located source-wide.

II.A.36 Maintenance Shops - Source-Wide
Maintenance shops located source-wide including Truck Shop. Miscellaneous powered and
non-powered exhaust vents.

II.A.37

Miscellaneous Mobile Equipment - Source-Wide
Miscellaneous mobile equipment located source-wide. No unit specific applicable
requirements.
Status: In compliance – No unapproved equipment was noted at time of the inspection. It was also
noted that items II.A.2, II.A.3, II.A.10, II.A.14, and II.A.27 have been removed and are no
longer operating on-site. One tank has been added to the existing 7 tanks (item II.A.6) for a
permitted total of 8 tanks. Finally, the FOAM-1 Line – TrueCore Insulated Panels Line was
installed and started operations on February 2024. Construction status notices have been
submitted. See status of conditions II.B.1.o and II.B.1.p.

II.B Requirements and Limitations

The following emission limitations, standards, and operational limitations apply to the permitted
facility as indicated:

15

II.B.1 Conditions on permitted source (Source-wide)

II.B.1.a Condition:

Unless otherwise specified in this permit, at all times, including periods of startup, shutdown, and
malfunction, the permittee shall, to the extent practicable, maintain and operate any equipment,
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. [Origin: DAQE-AN100280019-24].
[40 CFR 60.11(d), R307-401-4]

II.B.1.a.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.1.a.2 Recordkeeping:

Permittee shall document activities performed to assure proper operation and maintenance.
Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.1.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – The internal and the NMS databases is used to track all maintenance.

II.B.1.b Condition:

1. The permittee shall not allow visible emissions from any fugitive dust source to exceed 20
percent opacity on site and 10 percent at the property boundary.

2. The permittee shall water spray and/or chemically treat all unpaved roads and other unpaved
operational areas that are used by mobile equipment to maintain opacity limits unless the
temperature is below freezing.

3. The permittee shall sweep paved areas on an "as needed" basis to maintain visible emission
limits.

4. If chemical treatment is to be used, the plan shall be approved by the Director.

[DAQE-AN100280019-24, R307-309-5]. [R307-401-8]

II.B.1.b.1 Monitoring:

Opacity observations of fugitive dust shall be conducted quarterly according to 40 CFR 60,
Appendix A, Method 9. Opacity observations of fugitive dust from any source shall be
measured at the densest point of the plume. For intermittent sources the requirement for
observations to be made at 15-second intervals over a six-minute period shall not apply. The
number of observations and the time period shall be determined by the length of the
intermittent source.
16

For fugitive dust generated by mobile sources, 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.

II.B.1.b.2 Recordkeeping:

Records of water and/or chemical treatment shall be kept for all periods when the plant is in
operation. The records shall include the following items:

(1) Date.
(2) Number of treatments made, dilution ratio, and quantity.
(3) Rainfall received, if any, and approximate amount.
(4) Time of day that treatments are made.
(5) Records of temperature if the temperature is below freezing.

Records demonstrating compliance with this condition and all results of opacity observations
shall be maintained as described in Provision I.S.1 of this permit.

II.B.1.b.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – Quarterly opacity observations are conducted. The last observation conducted
indicated 0% opacity. Dedicated water trucks are used on-site to control fugitive emissions. A
hardcopy water log is maintained that meets the above requirements. Sweeping is performed
on an as needed basis.

II.B.1.c Condition:

The permittee shall comply with the applicable requirements for recycling and emission reduction
for class I and class II refrigerants pursuant to 40 CFR 82, Subpart F - Recycling and Emissions
Reduction. [Origin: 40 CFR 82]. [40 CFR 82.150(b)]

II.B.1.c.1 Monitoring:

The permittee shall certify, in the annual compliance statement required in Section I of this
permit, its compliance status with the requirements of 40 CFR 82, Subpart F.

II.B.1.c.2 Recordkeeping:

All records required in 40 CFR 82, Subpart F shall be maintained consistent with the
requirements of Provision S.1 in Section I of this permit.

II.B.1.c.3

Reporting:

All reports required in 40 CFR 82, Subpart F shall be submitted as required. There are no
additional reporting requirements except as outlined in Section I of this permit.

Status: In compliance – The contractor (Utah Engineering) maintains the sites refrigerants on an
annual basis. Records from Utah Engineering are maintained on-site. A Proof of Certification
letter is also provided to Vulcraft, by Utah Engineering. Certified compliance with this
condition is included in the current annual compliance certification.
17

II.B.1.d Condition:

Combined site-wide emissions of volatile organic compounds (VOCs) from the dip tanks, paint
booths, spray painting, degreasers, parts cleaners and foaming operations shall not exceed 185.44
tons per rolling 12-month period. [Origin: DAQE-AN100280019-24]. [R307-401-8]

II.B.1.d.1 Monitoring:

Compliance shall be demonstrated on a rolling 12-month total. Based on the last day of each
month, a new 12-month total shall be calculated using data from the previous twelve months.
Monthly calculations shall be made no later than 20 days after the end of each calendar
month.

II.B.1.d.2 Recordkeeping:

VOC emissions shall be determined by maintaining a record of VOC emitting materials
used each month. The records shall include the following data for each material used:

1. Name of the VOC emitting material, such as: paint, adhesive, solvent, thinner, reducers,
chemical compounds, toxics, isocyanates, etc.

2. Density of each material used (pounds per gallon).

3. Percent by weight of VOC in each material used.

4. Gallons of each VOC emitting material used.

5. The amount of VOC emitted monthly by each material used shall be calculated by the
following procedure:

VOC = (% VOC by Weight) x (Density lb) x (gal Consumed) x (1 ton)
(100) (gal) (2,000 lb)

6. The amount of VOC’s from TrueCore foam operations shall be calculated as follows:
VOC = (lb foam generated) x (% Blowing Agent) x (% VOC Release Rate) x (1 ton)
(100) (100) (2,000 lb)

7. The total amount of VOC emitted monthly from all materials used.

8. The amount of VOCs reclaimed for the month shall be similarly quantified and
subtracted from the quantities calculated above to provide the monthly total VOC
emissions.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

18

II.B.1.d.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – Combined plant wide VOC emissions as of December 2024:

Pollutant Limit (Tons) Actual Emissions (Tons)
Plant Wide VOCs 185.44 49.95

II.B.1.e

Condition:

Combined site-wide emissions of hazardous air pollutants (HAPs) from the dip tanks, paint booths,
spray painting, degreasers, parts cleaners and foaming operations shall not exceed 4.77 tons per
rolling 12-month period for any individual HAP, and 9.39 tons per rolling 12-month period for all
HAPs combined. [Origin: DAQE-AN100280019-24]. [R307-401-8]

II.B.1.e.1 Monitoring:

Compliance shall be demonstrated on a rolling 12-month total. Based on the last day of each
month, a new 12-month total shall be calculated using data from the previous twelve months.
Monthly calculations shall be made no later than 20 days after the end of each calendar
month.

II.B.1.e.2 Recordkeeping:

HAP emissions shall be determined by maintaining a record of HAP emitting materials used
each month. The records shall include the following data for each material used:

1. Name of the HAP emitting material, such as: paint, adhesive, solvent, thinner, reducers,
chemical compounds, toxics, isocyanates, etc.

2. Density of each material used (pounds per gallon).

3. Percent by weight of HAP in each material used.

4. Gallons of each HAP emitting material used.

5. The amount of HAP emitted monthly by each material used shall be calculated by the
following procedure:

HAP = (% HAP by Weight) x (Density lb) x (gal Consumed) x (1 ton)
(100) (gal) (2,000 lb)

6. The amount of HAP’s from the TrueCore foam operations shall be calculated using the
American Chemistry Council MDI Emission from Foam Production calculator.

7. The total amount of HAP emitted monthly from all materials used.

8. The amount of HAPs reclaimed for the month shall be similarly quantified and
subtracted from the quantities calculated above to provide the monthly total HAP
emissions.

19

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.1.e.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – Combined plant wide HAP emissions as of December 2024:

Pollutant Limit (Tons) Actual Emissions (Tons)
Plant Wide HAPs 9.39 0.58

II.B.1.f

Condition:

The permittee shall comply with all applicable requirements in 40 CFR 63, Subpart XXXXXX -
National Emission Standards for Nine Metal Fabrication and Finishing Source Categories including,
but not limited to, the following: all operations including:

(1) Dry abrasive blasting standards. If the permittee owns or operates a new or existing dry
abrasive blasting affected source, the permittee shall comply with the requirements in
paragraphs (a)(1) through (3) of 40 CFR 63.11516, as applicable, for each dry abrasive
blasting operation that uses materials that contain metal fabrication or finishing metal HAP
(MFHAP), as defined in 40 CFR 63.11522, “What definitions apply to this subpart?”, or has
the potential to emit MFHAP. These requirements do not apply when abrasive blasting
operations are being performed that do not use any materials containing MFHAP or do not
have the potential to emit MFHAP.

(2) Standards for machining. If the permittee owns or operates a new or existing machining
affected source, the permittee shall implement management practices to minimize emissions
of MFHAP as specified in paragraph (b)(1) and (2) of 40 CFR 63.11516 for each machining
operation that uses materials that contain MFHAP, as defined in 40 CFR 63.11522, “What
definitions apply to this subpart?”, or has the potential to emit MFHAP. These requirements
do not apply when machining operations are being performed that do not use any materials
containing MFHAP and do not have the potential to emit MFHAP.

(3) Standards for dry grinding and dry polishing with machines. If the permittee owns or
operates a new or existing dry grinding and dry polishing with machines affected source, the
permittee shall comply with the requirements of paragraphs (c)(1) and (2) of 40 CFR
63.11516 for each dry grinding and dry polishing with machines operation that uses
materials that contain MFHAP, as defined in 40 CFR 63.11522, “What definitions apply to
this subpart?”, or has the potential to emit MFHAP. These requirements do not apply when
dry grinding and dry polishing operations are being performed that do not use any materials
containing MFHAP and do not have the potential to emit MFHAP

(4) Standards for control of MFHAP in spray painting. If the permittee owns or operates a new
or existing spray painting affected source, as defined in 40 CFR 63.11514 (b)(4), “Am I
subject to this subpart?”, the permittee shall implement the management practices in
paragraphs (d)(1) through (9) of 40 CFR 63.11516 when a spray-applied paint that contains
MFHAP is being applied. These requirements do not apply when spray-applied paints that
do not contain MFHAP are being applied.

20

(5) Standards for welding. If the permittee owns or operates a new or existing welding affected
source, the permittee shall comply with the requirements in paragraphs (f)(1) and (2) of 40
CFR 63.11516 for each welding operation that uses materials that contain MFHAP, as
defined in 40 CFR 63.11522, “What definitions apply to this subpart?”, or has the potential
to emit MFHAP. If the permittee’s welding affected source uses 2,000 pounds or more per
year of welding rod containing one or more MFHAP (calculated on a rolling 12-month
basis), the permittee shall demonstrate that management practices or fume control measures
are being implemented by complying with the requirements in paragraphs (f)(3) through (8)
of 40 CFR 63.11516. The requirements in paragraphs (f)(1) through (8) of 40 CFR 63.11516
do not apply when welding operations are being performed that do not use any materials
containing MFHAP or do not have the potential to emit MFHAP.

The permittee shall comply with the applicable General Provisions in 40 CFR 63.1-15 as identified
in Table 2 of 40 CFR 63, Subpart XXXXXX.

[Origin: 40 CFR 63 Subpart XXXXXX]. [40 CFR 63.11516, 40 CFR 63.11523]

II.B.1.f.1 Monitoring:

(a) Visual determination of fugitive emissions, general. Visual determination of fugitive
emissions shall be performed according to the procedures of EPA Method 22, of 40 CFR
part 60, Appendix A-7. The permittee shall conduct the EPA Method 22 test while the
affected source is operating under normal conditions. The duration of each EPA Method
22 test shall be at least 15 minutes, and visible emissions will be considered to be
present if they are detected for more than six minutes of the fifteen-minute period.

(b) Visual determination of fugitive emissions, graduated schedule. Visual determinations of
fugitive emissions shall be performed in accordance with paragraph (a) of this section
and according to the schedule in paragraphs (b)(1) through (4) of 40 CFR 63.11517.

(c) Visual determination of emissions opacity for welding Tier 2 or 3, general. Visual
determination of emissions opacity shall be performed in accordance with the procedures
of EPA Method 9, of 40 CFR part 60, Appendix A-4, and while the affected source is
operating under normal conditions. The duration of the EPA Method 9 test shall be thirty
minutes.

(d) Visual determination of emissions opacity for welding Tier 2 or 3, graduated schedule.
The permittee shall perform visual determination of emissions opacity in accordance
with paragraph (c) of this section and according to the schedule in paragraphs (d)(1)
through (5) of 40 CFR 63.11517.

The permittee shall certify, in the annual compliance statement required in Section I of this
permit, its compliance status with the requirements of 40 CFR 63.11517.

II.B.1.f.2 Recordkeeping:

The permittee shall collect and keep records of the data and information specified in
paragraphs (c)(1) through (14) of 40 CFR 63.11519, according to the requirements in
paragraph (c)(15) of 40 CFR 63.11519.

There are no additional recordkeeping requirements except as outlined in Provision I.S.1 of
this permit.

21

II.B.1.f.3

Reporting:

The annual certification and compliance report shall contain the information specified in
paragraphs (b)(4)(i) through (iii) of 40 CFR 63.11519, and the information specified in
paragraphs (b)(5) through (9) of 40 CFR 63.11519 that is applicable to each affected source.
There are no additional reporting requirements except as outlined in Section I of this permit.

Status: In compliance – The facility is currently applicable under paragraph five of this condition. The
annual Subpart XXXXXX certification and compliance reports was received on January 7,
2025.

II.B.1.g Condition:

The permittee shall comply with the applicable requirements for all affected gasoline storage tanks.
The permittee shall not allow gasoline to be handled in a manner that would result in vapor releases
to the atmosphere for extended periods of time. Measures to be taken include, but are not limited to,
the following:

i) Minimize gasoline spills;
ii) Clean up spills as expeditiously as practicable;
iii) Cover all open gasoline containers and all gasoline storage tank fill-pipes with a gasketed seal
when not in use;
iv) Minimize gasoline sent to open waste collection systems that collect and transport gasoline to
reclamation and recycling devices, such as oil/water separators.

At all times, the permittee shall operate and maintain any affected emission unit, including
associated air pollution control equipment and monitoring equipment, in a manner consistent with
safety and good air pollution control practices for minimizing emissions. Determination of whether
such operation and maintenance procedures are being used will be based on information available
which may include, but is not limited to, monitoring results, review of operation and maintenance
procedures, review of operation and maintenance records, and inspection of the source.

The permittee shall comply with the applicable general provisions in 40 CFR 63.1-15 as identified in
Table 3 of 40 CFR 63 Subpart CCCCCC.

[Origin: 40 CFR 63 Subpart CCCCCC]. [40 CFR 63.11111(b), 40 CFR 63.11115, 40 CFR 63.11116,
40 CFR 63.11130]

II.B.1.g.1 Monitoring:

Records required for this permit condition will serve as monitoring. Additionally, the
permittee shall comply with the applicable general provisions in 40 CFR 63.1-15 as
identified in Table 3 of 40 CFR 63 Subpart CCCCCC. [40 CFR 63.11130]

II.B.1.g.2 Recordkeeping:

The permittee shall keep records demonstrating monthly throughput is less than the 10,000-
gallon threshold level. Records shall be available within 24 hours of a request by the
Director to document gasoline throughput in the affected emission unit. [40 CFR
63.11111(e), 40 CFR 63.11116(b)]

The permittee shall keep records of the occurrence and duration of each malfunction of
operation (i.e., process equipment) or the air pollution control and monitoring equipment.
22

Records shall be kept of actions taken during periods of malfunction to minimize emissions,
including corrective actions to restore malfunctioning process and air pollution control and
monitoring equipment to its normal or usual manner of operation. [40 CFR 63.11115(b), 40
CFR 63.11125(d)]

The permittee shall comply with the applicable general provisions in 40 CFR 63.1-15 as
identified in Table 3 of 40 CFR 63 Subpart CCCCCC. [40 CFR 63.11130]

Documentation shall be kept that demonstrates compliance with this provision. Records shall
be maintained in accordance with Provision I.S.1. of this permit.

II.B.1.g.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – There are a total of four fuel storage tanks on-site. Two 500-gallon diesel tanks
at the Nucor Building Systems and one 10,000-gallon diesel tank at Vulcraft. Vulcraft also has
one 6,000-gallon gasoline tank. Reviewed records, regarding the gasoline tank, indicated that
392.5 gallons was the most monthly fuel throughput since the last inspection. According to
Vulcraft there have been no fuel tank malfunctions.

II.B.1.h Condition:

The permittee shall not operate a degreasing or solvent cleaning operation unless the conditions in
R307-335-4(1) through (7) are met.
(1) A cover shall be installed which shall remain closed except during actual loading, unloading or
handling of parts in cleaner. The cover shall be designed so that it can be easily operated with
one hand if:
(a) The volatility of the solvent is greater than 2kPa (15 mmHg or 0.3 psi) measured at 38
degrees C (100 degrees F),
(b) The solvent is agitated, or
(c) The solvent is heated.
(2) An internal draining rack for cleaned parts shall be installed on which parts shall be drained until
all dripping ceases. If the volatility of the solvent is greater than 4.3 kPa (32 mm Hg at 38
degrees C (100 degrees F)), the drainage facility shall be internal, so that parts are enclosed
under the cover while draining. The drainage facility may be external for applications where an
internal type cannot fit into the cleaning system.
(3) Waste or used solvent shall be stored in covered containers.
(4) Tanks, containers and all associated equipment shall be maintained in good operating condition,
and leaks shall be repaired immediately or the degreaser shall be shutdown.
(5) Written procedures for the operation and maintenance of the degreasing or solvent cleaning
equipment shall be permanently posted in an accessible and conspicuous location near the
equipment.
(6) If the solvent volatility is greater than 4.3 kPa (33 mm Hg or 0.6 psi) measured at 38 degrees C
(100 degrees F), or if solvent is heated above 50 degrees C (120 degrees F), then one of the
following control devices shall be used:
(a) Freeboard that gives a freeboard ratio greater than 0.7;
(b) Water cover if the solvent is insoluble in and heavier than water; or
(c) Other systems of equivalent control, such as a refrigerated chiller or carbon adsorption.
(7) If used, the solvent spray shall be a solid fluid stream at a pressure that does not cause excessive
splashing and may not be a fine, atomized or shower type spray.
[Origin: DAQE-AN100280019-24, R307-335-4]. [R307-335-4]
23

II.B.1.h.1 Monitoring:

Visual inspections shall be made at least once per semi-annual period to determine
compliance with this condition. Checklists used during each visual inspection shall contain
the requirements for the operation and maintenance of degreasing or solvent cleaning
equipment.

II.B.1.h.2 Recordkeeping:

Results of monitoring shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.1.h.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – There are currently eight covered degreasers (part washers) on-site. All of the
above conditions are checked at time of the six-month inspections. The solvent washers are
maintained by Safety Kleen. The six-month inspection reports are maintained electronically.
The last inspections were conducted on May 23, 2024, and November 21, 2024.

II.B.1.i Condition:

In addition to meeting the requirements of R307-335-4(3), (4) and (5), the permittee shall meet the
following requirements for open top degreasers.
(1) Equip the vapor degreaser with a cover that can be opened and closed without disturbing the
vapor zone. The cover shall be closed except when processing workloads through the degreaser;
(2) Install one of the following control devices:
(a) Equipment necessary to sustain:
(i) a freeboard ratio greater than or equal to 0.75, and
(ii) a powered cover if the degreaser opening is greater than 1 square meter (10.8 square
feet),
(b) Refrigerated chiller,
(c) Enclosed design (cover or door opens only when the dry part is actually entering or exiting
the degreaser),
(d) Carbon adsorption system, with ventilation greater than or equal to 15 cubic meters per
minute per square meter (50 cubic feet per minute per square foot) of air/vapor area when
cover is open and exhausting less than 25 parts per million of solvent averaged over one
complete adsorption cycle;
(3) Minimize solvent carryout by:
(a) Racking parts to allow complete drainage,
(b) Moving parts in and out of the degreaser at less than 3.3 meters per minute (11 feet per
minute),
(c) Holding the parts in the vapor zone at least 30 seconds or until condensation ceases,
(d) Tipping out any pool of solvent on the cleaned parts before removal, and
(e) Allowing the parts to dry within the degreaser for at least 15 seconds or until visibly dry.
(4) Spray parts only in or below the vapor level,
(5) Not use ventilation fans near the degreaser opening, nor provide exhaust ventilation exceeding
20 cubic meters per minute per square meter (65 cubic feet per minute per square foot) in
degreaser open area, unless necessary to meet state and federal occupational, health, and safety
requirements.
(6) Not degrease porous or absorbent materials, such as cloth, leather, wood or rope;
(7) Not allow workloads to occupy more than half of the degreaser's open top area;
24

(8) Ensure that solvent is not visually detectable in water exiting the water separator;
(9) Install safety switches on the following:
(a) Condenser flow switch and thermostat (shuts off sump heat if condenser coolant is either
not circulating or too warm); and
(b) Spray switch (shuts off spray pump if the vapor level drops excessively, i.e., greater than
10 cm (4 inches); and
(10) Open top vapor degreasers with an open area smaller than one square meter (10.8 square feet)
are exempt from (2)(b) and (d) above.

[Origin: R307-335-5]. [R307-335-5]

II.B.1.i.1 Monitoring:

Visual inspections shall be made at least once per semi-annual period to determine
compliance with this condition. Checklists used during each visual inspection shall contain
the requirements for the operation and maintenance of degreasing or solvent cleaning
equipment.

II.B.1.i.2 Recordkeeping:

Results of monitoring shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.1.i.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: N/A – There are no open top degreasers or solvent washers operating at the facility.

II.B1.j Condition:

1. The permittee shall not sell, supply or offer for sale any adhesive, sealant, adhesive primer or
sealant primer with a VOC content in excess of the limits in Table 1 of R307-342-5 and that was
manufactured on or after September 1, 2014.
2. The permittee shall not apply any adhesive, sealants, adhesive primer or sealant primer with a
VOC content in excess of the limits specified in Table 1 of R307-342-5 unless an add-on control
device as specified in R307-342-8 is used or unless the adhesive, sealant, adhesive primer or
sealant primer was manufactured before September 1, 2014.
3. The VOC content limits in Table 1 of R307-342-5 for adhesives applied to particular substrates
shall apply as specified in R307-342-5(4).
4. The permittee shall comply with the additional standards and work practices contained in R307-
342-6 and R307-342-7, as applicable.
5. These requirements do not apply if exempted in accordance with R307-342-3.

[Origin: R307-342]. [R307-342]

II.B.1.j.1 Monitoring:

Records required for this permit condition will serve as monitoring.

25

II.B.1.j.2 Recordkeeping:

(a) For operations that are not exempt under R307-342-3, the permittee shall maintain
records demonstrating compliance as specified in R307-342-7(2).
(b) If an exemption is claimed pursuant to R307-342-3 the permittee shall record and
maintain operational records sufficient to demonstrate compliance. (R307-342-3(7))

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.1.j.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – The roof adhesives regulated under Utah Administration Code (UAC) Rule
(R) 307-342-5, are used at the Nucor Building System plant. The relevant category for this
adhesive would be considered a non-membrane roof installation/repair with a limit of 300 g/L.
The Safety Data Sheet (SDS) for this material is equal to 191 g/L VOC.

II.B.1.k Condition:

1. The permittee shall not apply coatings with a VOC content greater than the amounts specified in
Table 1 of R307-350-5, unless the owner or operator uses an add-on control device as specified
in R307-350-8.

2. If more than one content limit indicated in Table 1 of R307-350-5 applies to a specific coating,
then the most stringent content limit shall apply.

3. The permittee shall not apply VOC containing coatings to metal parts and products unless the
coating is applied with equipment operated according to the equipment manufacturer
specifications, and by the use of one of the methods specified in R307-350-6.

4. The permittee shall comply with the additional standards and work practices specified in R307-
350-7.

5. These requirements do not apply if exempted in accordance with R307-350-3.

[Origin: R307-350]. [R307-350-2, R307-350-3, R307-350-5, R307-350-6, R307-350-7]

II.B.1.k.1 Monitoring

Records required for this permit condition will serve as monitoring.

II.B.1.k.2

Recordkeeping:

The permittee shall maintain records demonstrating compliance as specified in R307-350-9.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

26

II.B.1.k.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status:

In compliance – According to the coating records, the facility has not exceeded the VOC limit
noted in Table 1 of R307-350-5.

Coating / Paint Process VOC Limit (lb/gal) VOC Content (lb/gal)
Black Dip Grating Dip Coating 2.8 2.56
Gray Dip Joist Dip Coating 2.8 0.88
Bridging Joist Bridging 2.8 1.8
Red Spray NBS Structural Spray 2.3 1.14
Red Vacuum Purlin, Rod, Dip 2.3 1.87
Gray Spray NBS Structural Spray 2.3 1.09
Gray Vacuum Purlin, Rod, Dip 2.3 1.89

II.B.1.l

Condition:

Except as provided in R307-361-4, the permittee shall not manufacture, blend, or repackage, supply,
sell, or offer for sale within the counties in R307-361-2; or solicit for application, or apply within the
counties in R307-361-2 any architectural coating with a VOC content in excess of the corresponding
limit specified in Table 1 of R307-361-5. The permittee shall comply with the additional standards
and work practices contained in R307-361-5, as applicable.

[Origin: R307-361]. [R307-361]

II.B.1.l.1 Monitoring:

Compliance shall be demonstrated as specified in R307-361-8.

II.B.1.l.2 Recordkeeping:

Records demonstrating compliance with this condition shall be maintained in accordance
with Provision I.S.1 of this permit.

27

II.B.1.l.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – According to the architectural coating records, the facility has not exceeded
the VOC limits noted in Table 1 of R307-361-2.

Note: Table of only non exempt coatings/paints

Coating / Paint VOC Limit
(g/L)
VOC Content of Coatings
(g/L)
Behr Premium Plus Interior Semi-Gloss 100 53
Safety Red WB DTM Enamel 50 45
Safety Yellow DTM Enamel 50 42
DAP WELDWOOD Multi-Purpose Floor
Covering Adhesive
100 34
POLY-CRETE PC-1000 PART A BASE 100 0
HOT TRAX WHITE and COLORS 100 >50
American Safety Technologies MS-7CZ Gray
Part A
100 0
Mascoat Sound Control -dB 100 35
KILZ 2 Int/Ext Water-Base Primer Sealer Low
VOC
50 2
Eco-Duct Seal Low VOC 420 223
PPG HPC High Gloss Cure Comp B 150 130
DRYWALL PRIMER 5-GL 100 89
GORE-TEX Joint Sealant Product 100 0

II.B.1.m Condition:

Visible emissions shall be at or below 20% opacity, unless otherwise specified in this permit.
[Origin: DAQE-AN100280019-24, R307-201]. [R307-401-8]

II.B.1.m.1 Monitoring:

A visual observation of each affected emission unit shall be performed on a quarterly basis.
Visual observations shall be made by an individual trained on the observation procedures of
40 CFR 60, Appendix A, Method 9. The individual is not required to be a certified visible
emissions observer (VEO). If any visible emissions are observed, an opacity determination
shall be performed by a certified VEO in accordance with 40 CFR 60, Appendix A, Method
9. The opacity determination shall be made within 24 hours, or at the beginning of the next
day of operation, whichever period is longer.

If any baghouse or dust collector operates and vents inside a building, the permittee shall
conduct opacity observations on visible emissions from the building.

II.B.1.m.2 Recordkeeping:

Results of monitoring shall be maintained as described in 40 CFR 60, Appendix A, Method
9, and Provision I.S.1 of this permit.
28

II.B.1.m.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – Quarterly visual observations are conducted using Emission Unit Observation
Forms. The forms indicated, at time of inspection, that no EPA Method 9 Visible Emission
Observations (VEOs) have been conducted to date. Method 22 observations are conducted first
to determine if Method 9 observations are required. Hardcopies or electronic copies of the
forms are kept on-site.

II.B.1.n Condition:

The permittee shall not exceed the following production limits:
A. 79,100 tons of production from the Nucor Building Systems operations per rolling 12-month
period.
B. 154,200 tons of production from the Joist Plant and mini-joist operations per rolling 12-month
period.
C. 18,854 tons of production from the Structural Productions operations per rolling 12-month
period.
D. 15,000 tons of production from the Steel Grating operations per rolling 12-month period.

[Origin: DAQE-AN100280019-24]. [R307-401-8]

II.B.1.n.1 Monitoring:

The permittee shall demonstrate compliance with the rolling 12-month total for each
production limit. The permittee shall calculate and record a new 12-month total by the last
day of each month using data from the previous 12 months.

II.B.1.n.2 Recordkeeping:

Records of production shall be kept for all periods when the plant is in operation. Records of
production shall be kept on a daily basis and shall be determined by examination of sales,
billing records, or operation logs.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.1.n.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status:

In compliance – Facility production as of December 2024:

Production Locations Limit (Tons) Production (Tons)
Nucor Building Systems 79,100 48,136.67
Joist Plant 154,200 51,424.56
Structural Production 18,854 0.0
Steel Grating 15,000 4,676.75

29

II.B.1.o Condition:

By November 22, 2024 the permittee shall submit documentation to the Director on the status of
construction of the NCF (Wet) Plasma Cutter Table - Cold Finish Plant, One (1) Baseplate Processor
- Joist Plant, One (1) Emergency Engine - Joist Plant, Beam Line - Joist Plant, Flange Line - Nucor
Building Systems, and One (1) Shot Blaster - Nucor Building Systems. The referenced Approval
Order (AO) may become invalid if construction is not commenced by November 22, 2024 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. [Origin: R307-401-18, DAQE-
AN100280019-24]. [R307-401-18]

II.B.1.o.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.1.o.2 Recordkeeping:

As applicable, the permittee shall maintain a copy of each notification required by this
permit condition in accordance with Provision I.S.1 of this permit.

II.B.1.o.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – The construction status notice, dated August 14, 2024, was received on August
19, 2024, before the due date of November 22, 2024.

II.B.1.p Condition:
By July 12, 2025 the permittee shall submit documentation to the Director on the status of
construction of one (1) new dip tank at the Mini-Joist Line, and the new equipment associated with
the TrueCore insulated Panels Building including the FOAM-1 Line, Mastic Applicator, Corona
Treatment Machine, and Tanks. The referenced Approval Order (AO) may become invalid if
construction is not commenced by July 12, 2025, 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. [Origin: R307-401-18, DAQE- AN100280019-24]. [R307-401-18]

II.B.1.p.1 Monitoring:
Records required for this permit condition will serve as monitoring.

II.B.1.p.2 Recordkeeping:

As applicable, the permittee shall maintain a copy of each notification required by this permit
condition in accordance with Provision I.S.1 of this permit.

30

II.B.1.p.3 Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – The construction status notice, dated August 14, 2024, was received on August
19, 2024, before the due date of July 12, 2025.

II.B.2 Coil Line Dust Collector (Baghouse) - Cold Finish Plant

II.B.2.a Condition:

Visible emissions shall not exceed 5% opacity. [Origin: DAQE-AN100280019-24]. [R307-201,
R307-401-8]

II.B.2.a.1 Monitoring:

A visual observation shall be performed at least once during each week that the dust
collector (baghouse) operates. Visual observations shall be made by an individual trained on
the observation procedures of 40 CFR 60, Appendix A, Method 9. The individual is not
required to be a certified visible emissions observer). If any visible emissions are observed,
an opacity determination shall be performed by a certified visible emission observer in
accordance with 40 CFR 60, Appendix A, Method 9. The opacity determination shall be
made within 24 hours of the initial opacity survey, or at the beginning of the next day of dust
collector (baghouse) operation, whichever period is longer.

II.B.2.a.2 Recordkeeping:

Results of monitoring shall be maintained as described in 40 CFR 60, Appendix A, Method
9, and Provision I.S.1 of this permit.

II.B.2.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – The Coil Line baghouse ceased operations and was removed on October 23,
2024. However, weekly visual observations were conducted of the baghouse by using Emission
Unit Observation Forms. The forms indicated, at time of inspection, that no EPA Method 9
VEOs have been conducted as of the date the baghouse was removed. Method 22 observations
were conducted first to determine if Method 9 observations are required. Hardcopies of the
form are kept on-site.

II.B.2.b Condition:

The permittee shall operate the dust collector (baghouse) within the static pressure range
recommended by the manufacturer for normal operations. [Origin: DAQE-AN100280019-24].
[R307-401-8]

31

II.B.2.b.1 Monitoring:

(a) The permittee shall install a manometer, solid-state electronic, or magnehelic pressure
gauge to measure the differential pressure across the Coil Line Dust Collector
(Baghouse).

(b) Each gauge shall be maintained, operated, and calibrated in accordance with
manufacturer recommendations.

(c) Each pressure gauge shall be located such that an inspector/operator can safely read the
indicator at any time.

(d) The permittee shall monitor the dust collector (baghouse) at least once during each week
of operation to demonstrate that pressure drop is within the required range.

II.B.2.b.2 Recordkeeping:

Pressure drop readings shall be recorded at least once during each week of operation while
the baghouse is operating. Records documenting the pressure drop shall be kept in a log and
shall include the following:

(a) Unit identification;

(b) Manufacturer recommended pressure drop for the unit including the gauge measurement
metric (kPA, mbar, inches of water, etc);

(c) Weekly pressure drop readings with the appropriate metric, consistent with the condition
above (kPA, mbar, inches of water, etc);

(d) Date of reading.

The permittee shall maintain records of the manufacturer recommended pressure ranges and
gauge measurement metric. Documentation of gauge calibration shall be maintained.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.2.b.3

Status:
Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

In compliance – The Coil Line baghouse ceased operations and was removed on October 23,
2024. However, weekly differential pressure (dp) readings, of the Coil Line baghouse, were
maintained, by using Baghouse Reading Forms, as of the date the baghouse was removed.

II.B.3 Bar Line Dust Collector (Baghouse) - Cold Finish Plant

II.B.3.a Condition:

Visible emissions shall not exceed 5% opacity. [Origin: DAQE-AN100280019-24].
[R307-201, 307-401-8]

32

II.B.3.a.1 Monitoring:

A visual observation shall be performed at least once during each week that the dust
collector (baghouse) operates. Visual observations shall be made by an individual trained on
the observation procedures of 40 CFR 60, Appendix A, Method 9. The individual is not
required to be a certified visible emissions observer. If any visible emissions are observed,
an opacity determination shall be performed by a certified in accordance with 40 CFR 60,
Appendix A, Method 9. The opacity determination shall be made within 24 hours of the
initial opacity survey, or at the beginning of the next day of dust collector (baghouse)
operation, whichever period is longer.

II.B.3.a.2 Recordkeeping:

Results of monitoring shall be maintained as described in 40 CFR 60, Appendix A, Method
9, and Provision I.S.1 of this permit.

II.B.3.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – The Bar Line baghouse ceased operations and was removed on October 30,
2024. However, weekly visual observations were conducted of the Bar Line baghouse by using
Emission Unit Observation Forms. The forms indicated, at time of inspection, that no EPA
Method 9 VEOs have been conducted as of the date the baghouse was removed. Method 22
observations were conducted first to determine if Method 9 observations were required.
Hardcopies of the form are kept on-site.

II.B.3.b Condition:

The permittee shall operate the dust collector (baghouse) within the static pressure range
recommended by the manufacturer for normal operations. [Origin: DAQE-AN100280019-24].
[R307-401-8]

II.B.3.b.1 Monitoring:

(a) The permittee shall install a manometer, solid-state electronic, or magnehelic pressure
gauge to measure the differential pressure across the Bar Line Dust Collector
(Baghouse).

(b) Each gauge shall be maintained, operated, and calibrated in accordance with
manufacturer recommendations.

(c) Each pressure gauge shall be located such that an inspector/operator can safely read the
indicator at any time.

(d) The permittee shall monitor the dust collector (baghouse) at least once during each week
of operation to demonstrate that pressure drop is within the required range.

33

II.B.3.b.2 Recordkeeping:

Pressure drop readings shall be recorded at least once during each week of operation while
the baghouse is operating. Records documenting the pressure drop shall be kept in a log and
shall include the following:

(a) Unit identification;

(b) Manufacturer recommended pressure drop for the unit including the gauge measurement
metric (kPA, mbar, inches of water, etc);

(c) Weekly pressure drop readings with the appropriate metric, consistent with the condition
above (kPA, mbar, inches of water, etc);

(d) Date of reading.

The permittee shall maintain records of the manufacturer recommended pressure ranges and
gauge measurement metric. Documentation of gauge calibration shall be maintained.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.3.b.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – The Bar Line baghouse ceased operations and was removed on October 30,
2024. However, weekly differential pressure (dp) readings of the Bar Line baghouse were
maintained by using Baghouse Reading Forms as of the date the baghouse was removed.

II.B.4 Wire Line Baghouse (Dust Collector) - Cold Finish Plant

II.B.4.a Condition:

Visible emissions shall not exceed 5% opacity. [Origin: DAQE-AN100280019-24].
[R307-401-8]

II.B.4.a.1 Monitoring:

A visual observation shall be performed at least once during each week that the baghouse
(dust collector) operates. Visual observations shall be made by an individual trained on the
observation procedures of 40 CFR 60, Appendix A, Method 9. The individual is not required
to be a certified visible emissions observer. If any visible emissions are observed, an opacity
determination shall be performed by a certified visible emissions observer in accordance
with 40 CFR 60, Appendix A, Method 9. The opacity determination shall be made within 24
hours of the initial opacity survey, or at the beginning of the next day of baghouse (dust
collector) operation, whichever period is longer.

II.B.4.a.2 Recordkeeping:

Results of monitoring shall be maintained as described in 40 CFR 60, Appendix A, Method
9, and Provision I.S.1 of this permit.

34

II.B.4.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – Weekly visual observations are conducted, of the Wire Line baghouse, by
using Emission Unit Observation Forms. The forms indicated, at time of inspection, that no
EPA Method 9 VEOs have been conducted to date. Method 22 observations are conducted first
to determine if Method 9 observations are required. Hardcopies of the form are kept on-site.

II.B.4.b Condition:

The permittee shall operate the baghouse (dust collector) within the static pressure range
recommended by the manufacturer for normal operations. [Origin: DAQE-AN100280019-24].
[R307-401-8]

II.B.4.b.1 Monitoring:

(a) The permittee shall install a manometer, solid-state electronic, or magnehelic pressure
gauge to measure the differential pressure across the Wire Line Baghouse (Dust
Collector).

(b) Each gauge shall be maintained, operated, and calibrated in accordance with
manufacturer recommendations.

(c) Each pressure gauge shall be located such that an inspector/operator can safely read the
indicator at any time.

(d) The permittee shall monitor the baghouse (dust collector) at least once during each week
of operation to demonstrate that pressure drop is within the required range.

II.B.4.b.2 Recordkeeping:

Pressure drop readings shall be recorded at least once during each week of operation while
the baghouse is operating. Records documenting the pressure drop shall be kept in a log and
shall include the following:

(a) Unit identification;

(b) Manufacturer recommended pressure drop for the unit including the gauge measurement
metric (kPA, mbar, inches of water, etc);

(c) Weekly pressure drop readings with the appropriate metric, consistent with the condition
above (kPA, mbar, inches of water, etc);

(d) Date of reading.

The permittee shall maintain records of the manufacturer recommended pressure ranges and
gauge measurement metric. Documentation of gauge calibration shall be maintained.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

35

II.B.4.b.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – Weekly differential pressure (dp) readings, of the Wire Line baghouse, are
maintained by using the NMS database. Annual calibrations are conducted by Western States
Calibration (WSC). WSC repairs and replaces the meters as needed. The company also
provides Certificates of Calibration, which are kept electronically.

II.B.5 Eight (8) Surface Coating Dip Tanks - Joist Plant

II.B.5.a Condition:

All dip tanks shall be covered when not in use. [Origin: DAQE-AN100280019-24]. [R307-401-8]

II.B.5.a.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.5.a.2 Recordkeeping:

Records shall include the following:

(a) Dates and times when steel product assembly/painting commences and ends.

(b) Verification the dip tank covers are in a closed position within one-hour of when steel
product assembly/painting ceased.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.5.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – Hardcopies of the Daily Dip Tank Logs are maintained by the operators. The
records contained dates and times when painting commenced and ended. They also verified
when dip tank covers were in a closed position and when tanks were not in use for 1 hour. See
status of condition II.B.8.a.

II.B.6 One (1) Steel Grating Plasma Cutter - Joist Plant

II.B.6.a Condition:

Visible emissions shall not exceed 10% opacity. [DAQE-AN100280019-24]. [R307-401-8]

II.B.6.a.1 Monitoring:

In lieu of visible emissions observations, the permittee shall perform a quarterly inspection
to ensure that the baghouse operates inside of the Joist Plant building and does not vent to
the atmosphere.

36

II.B.6.a.2 Recordkeeping:

Results of quarterly monitoring shall be maintained as described in Provision I.S.1 of this
permit.

II.B.6.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – Quarterly inspections are conducted to ensure that the baghouse operates
inside the building. Electronic copies of the inspection forms are kept on-site.

II.B.6.b Condition:

The permittee shall operate the baghouse within the static pressure range recommended by the
manufacturer for normal operations. [Origin: DAQE-AN100280019-24]. [R307-401-8]

II.B.6.b.1 Monitoring:

(a) The permittee shall install a manometer, solid-state electronic, or magnehelic pressure
gauge to measure the differential pressure across each baghouse.

(b) Each gauge shall be maintained, operated, and calibrated in accordance with
manufacturer recommendations.

(c) Each pressure gauge shall be located such that an inspector/operator can read the
indicator safely at any time.

(d) The permittee shall monitor the baghouse at least once during each week of operation to
demonstrate that pressure drop is within the required range.

II.B.6.b.2 Recordkeeping:

Pressure drop readings shall be recorded at least once during each week of operation while
the baghouse is operating. Records documenting the pressure drop shall be kept in a log and
shall include the following:

(a) Unit identification;

(b) Manufacturer recommended pressure drop for the unit including the gauge measurement
metric (kPA, mbar, inches of water, etc);

(c) Weekly pressure drop readings with the appropriate metric, consistent with the condition
above (kPA, mbar, inches of water, etc);

(d) Date of reading.

The permittee shall maintain records of the manufacturer recommended pressure ranges and
gauge measurement metric. Documentation of gauge calibration shall be maintained.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

37

II.B.6.b.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – The Steel Grating Plasma Cutter baghouse dp reading are maintained. The
Baghouse Reading Forms are kept on-site. Annual calibrations are conducted by the operators
by use of the calibration process sheet. Meters are repaired and replaced on an as needed basis.
See status of condition II.B.6.a

II.B.7 One (1) Baseplate Processor - Joist Plant

II.B.7.a Condition:

Visible emissions shall not exceed 5% opacity. [Origin: DAQE-AN100280019-24].
[R307-401-8]

II.B.7.a.1 Monitoring:

In lieu of visible emissions observations, the permittee shall perform a quarterly inspection
to ensure that the baghouse operates inside of the Joist Plant building and does not vent to
the atmosphere.

II.B.7.a.2 Recordkeeping:

Results of quarterly monitoring shall be maintained as described in Provision I.S.1 of this
permit.

II.B.7.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: N/A – The Baseplate Processor has been removed and sold. See status of condition II.A.

II.B.7.b Condition:

The permittee shall operate the baghouse within the static pressure range recommended by
the manufacturer for normal operations. [Origin: DAQE-AN100280019-24]. [R307-401-8]

II.B.7.b.1 Monitoring:

(a) The permittee shall install a manometer or magnehelic pressure gauge to measure the
differential pressure across each baghouse.

(b) Each gauge shall be maintained, operated, and calibrated in accordance with
manufacturer recommendations.

(c) Each pressure gauge shall be located such that an inspector/operator can read the
indicator safely at any time.

(d) The permittee shall monitor the baghouse at least once during each week of operation to
demonstrate that pressure drop is within the required range.
38

II.B.7.b.2 Recordkeeping:

Pressure drop readings shall be recorded at least once during each week of operation while
the baghouse is operating. Records documenting the pressure drop shall be kept in a log and
shall include the following:

(a) Unit identification;

(b) Manufacturer recommended pressure drop for the unit including the gauge measurement
metric (kPA, mbar, inches of water, etc);

(c) Weekly pressure drop readings with the appropriate metric, consistent with the condition
above (kPA, mbar, inches of water, etc);

(d) Date of reading.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.7.b.3 Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: N/A – See status of condition of II.B.7.a.

II.B.8. One (1) Steel Grating Dip Tank - Joist Plant

II.B.8.a Condition:

Dip tank shall be covered when not in use. [Origin: DAQE-AN100280019-24]. [R307-401-8]

II.B.8.a.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.8.a.2 Recordkeeping:

Records shall include the following:

(a) Dates and times when steel product assembly/painting commences and ends.

(b) Verification that the dip tank cover is in a closed position within one-hour of when steel
product assembly/painting ceased.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

39

II.B.8.b.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – Hardcopies of the Daily Dip Tank Logs are maintained by the operators. The
records contained dates and times when painting commenced and ended. They also verified
when dip tank covers were in a closed position and when tanks were not in use for 1 hour. See
status of condition II.B.5.a.

II.B.9 Four (4) Make Up Air Heaters - Joist Plant

II.B.9.a Condition:

Visible emissions shall not exceed 10% opacity. [Origin: DAQE-AN100280019-24].
[R307-401-8]

II.B.9.a.1 Monitoring:

In lieu of monitoring via visible emission observations, fuel used shall be monitored to
demonstrate that only natural gas or propane is being combusted.

II.B.9.a.2 Recordkeeping:

An operating log shall be maintained to document any period when plant equipment is
operated using any fuel other than natural gas or propane.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.9.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – Natural gas is the only fuel used by the Make Up Air Heaters. Therefore, no
fuel log is required.

II.B.10 One (1) Emergency Engine - Joist Plant

II.B.10.a Condition:

Visible emissions shall not exceed 10% opacity. [Origin: DAQE-AN100280019-24].
[R307-401-8]

II.B.10.a.1 Monitoring:

In lieu of monitoring via visible emission observations, fuel used shall be monitored to
demonstrate that only natural gas or propane is being combusted.

40

II.B.10.a.2 Recordkeeping:

An operating log shall be maintained to document any period when plant equipment is
operated using any fuel other than natural gas or propane.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.10.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – Natural gas is the only fuel used by the emergency generator. Therefore, no
fuel log is required.

II.B.10.b Condition:

The permittee shall comply with all applicable requirements in 40 CFR 60, Subpart JJJJ - Standards
of Performance for Stationary Spark Ignition Internal Combustion Engines.

(1) Owners and operators of stationary SI ICE with a maximum engine power greater than or equal
to 75 KW (100 HP) (except gasoline and rich burn engines that use LPG) shall comply with the
emission standards in Table 1 to this subpart for their stationary SI ICE.

(2) For emergency stationary SI ICE, the permittee shall not install engines that do not meet the
applicable requirements in 40 CFR 60.4233 after January 1, 2011. These requirements do not
apply to stationary SI ICE that have been modified or reconstructed, and they do not apply to
engines that were removed from one existing location and reinstalled at a new location. [40 CFR
60.4236]

(3) The air-to-fuel ratio (AFR) controller, if used, shall be maintained and operated appropriately in
order to ensure proper operation of the engine and control device to minimize emissions at all
times. [40 CFR 60.4243(g)]

(4) The permittee shall operate and maintain stationary SI ICE that achieve the emission standards
as required in 40 CFR 60.4233 over the entire life of the engine. [40 CFR 60.4234]

(5) The permittee shall comply with the applicable general provisions in 40 CFR 60.1-19 (40 CFR
60 Subpart A) as identified in Table 3 of 40 CFR 60 Subpart JJJJ. [40 CFR 60.4246 and 40 CFR
60 Subpart JJJJ Table 3]

[Origin: 40 CFR 60 Subpart JJJJ, DAQE-AN100280019-24]. [40 CFR 60.4233(e), 40 CFR 60.4234,
40 CFR 60.4236, 40 CFR 60.4243(g), 40 CFR 60.4246, 40 CFR 63 Subpart ZZZZ]

II.B.10.b.1 Monitoring:

(a) The permittee shall demonstrate compliance according to one of the methods specified
in paragraphs (a)(1) and (2) of this section.

(1) Purchasing an engine certified according to procedures specified in this subpart, for
the same model year and demonstrating compliance according to one of the methods
specified in 40 CFR 60.4243(a). [40 CFR 60.4243(b)(1)]

41

(2) Purchasing a non-certified engine and demonstrating compliance with the emission
standards specified in 40 CFR 60.4233(e) and according to the requirements
specified in 40 CFR 60.4244, as applicable, and according to paragraphs (a)(2)(i) of
this section. [40 CFR 60.4243(b)(2)]

(i) The permittee of a stationary SI internal combustion engine greater than 25 HP
and less than or equal to 500 HP, shall keep a maintenance plan and records of
conducted maintenance and shall, to the extent practicable, maintain and operate
the engine in a manner consistent with good air pollution control practice for
minimizing emissions. In addition, the permittee shall conduct an initial
performance test to demonstrate compliance.

II.B.10.b.2 Recordkeeping:

(a) The permittee shall keep records of information in paragraphs (a)(1) through (4).

(1) All notifications submitted to comply with this subpart and all documentation
supporting any notification. [40 CFR 60.4245(a)(1)]

(2) Maintenance conducted on the engine. [40 CFR 60.4245(a)(2)]

(3) If the stationary SI internal combustion engine is a certified engine, documentation
from the manufacturer that the engine is certified to meet the emission standards and
information as required in 40 CFR parts 1048, 1054, and 1060, as applicable. [40
CFR 60.4245(a)(3)]

(4) If the stationary SI internal combustion engine is not a certified engine or is a
certified engine operating in a non-certified manner and subject to 40 CFR
60.4243(a)(2), documentation that the engine meets the emission standards. [40 CFR
60.4245(a)(4)]

Records shall be maintained as described in Provision I.S.1 of this permit.

II.B.10.b.3

Reporting:

There are no additional reporting requirements for this provision except those specified in
Section I of this permit.

Status: In compliance – The emergency generator is a certified engine and it is operated a as a
certified engine (Certificate of Conformity).

II.B.10.c Condition:

The permittee shall operate each emergency stationary ICE according to the requirements in
paragraphs (1) through (3). In order for the engine to be considered an emergency stationary ICE
under 40 CFR 60 Subpart JJJJ, any operation other than as described in (1) through (3), is prohibited.
If the engine is not operated according to the requirements of (1) through (3), it will not be
considered an emergency engine and shall meet all requirements for non-emergency engines.

(1) There is no time limit on the use of emergency stationary ICE in emergency situations.

42

(2) Emergency stationary ICE may be operated for the purposes specified in paragraph (a) for a
maximum of 100 hours per calendar year. Any operation for non-emergency situations as
allowed by paragraph (3) counts as part of the 100 hours per calendar year allowed by this
paragraph (2).

(a) Emergency stationary ICE may be operated for maintenance checks and readiness testing,
provided that the tests are recommended by federal, state or local government, the
manufacturer, the vendor, the regional transmission organization or equivalent balancing
authority and transmission operator, or the insurance company associated with the engine. A
petition for approval of additional hours to be used for maintenance checks and readiness
testing is not required if the permittee maintains records indicating that federal, state, or local
standards require maintenance and testing of emergency ICE beyond 100 hours per calendar
year.

(3) The permittee may operate the emergency stationary ICE up to 50 hours per calendar year in
nonemergency situations as specified in 40 CFR 60.4243(d)(3).

[Origin: 40 CFR 60 Subpart JJJJ]. [40 CFR 60.4243(d), 40 CFR 60.4243(e), 40 CFR 63 Subpart
ZZZZ]

II.B.10.c.1 Monitoring:

If the emission unit does not meet the standards applicable to non-emergency engines, the
permittee shall install a non-resettable hour meter. [40 CFR 60.4237(b)]

Records required for this permit condition will serve as monitoring.

II.B.10.c.2 Recordkeeping:

For all stationary SI emergency ICE that do not meet the standards applicable to non-
emergency engines, the permittee shall keep records of the hours of operation of the engine
that is recorded through the non-resettable hour meter, including:

(1) How many hours are spent for emergency operation;

(2) What classified the operation as emergency; and

(3) How many hours are spent for non-emergency operation.

[40 CFR 60.4245(b)]

Records shall be maintained as described in Provision I.S.1 of this permit.

43

II.B.10.c.3

Reporting:

If the permittee operates an emergency stationary SI ICE for the purpose specified in 40
CFR 60.4243(d)(3)(i), the permittee shall submit an annual report according to the
requirements in paragraphs 40 CFR 60.4243(e)(1) through (3).

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – The emergency engine is a certified engine. The on-site truck shop conducts
maintenance and maintenance checks as required. Maintenance was last conducted on October
17, 2024. The engine is operated for about 36 minutes on Mondays. Hours of operation are
tracked with a nonresectable hour meter. The engine had operated for 34 hours from January
1, 2024 – October 20, 2024. However, a deviation occurred that put an additional 120 hours on
the engine for a total of 154 hours. Thus, exceeding the 100 hours per calendar year for
emergency use. See deviation notice received November 14, 2024.

II.B.11 Beam Line - Joist Plant

II.B.11.a Condition:

Visible emissions shall not exceed 5% opacity. [Origin: DAQE-AN100280019-24].
[R307-401-8]

II.B.11.a.1 Monitoring:

In lieu of visible emissions observations, the permittee shall perform a quarterly inspection
to ensure that the baghouse operates inside of a building and does not vent to the
atmosphere.

II.B.11.a.2 Recordkeeping:

Results of quarterly monitoring shall be maintained as described in Provision I.S.1 of this
permit.

II.B.11.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: N/A – The Beam Line has been removed and sold. See status of condition II.A.

II.B.11.b Condition:

The permittee shall operate the baghouse within the static pressure range recommended by the
manufacturer for normal operations. [Origin: DAQE-AN100280019-24]. [R307-401-8]

44

II.B.11.b.1 Monitoring:

(a) The permittee shall install manometer or magnehelic pressure gauge to measure the
differential pressure across each baghouse.

(b) Each gauge shall be maintained, operated, and calibrated in accordance with
manufacturer recommendations.

(c) Each pressure gauge shall be located such that an inspector/operator can read the
indicator safely at any time.

(d) The permittee shall monitor the baghouse at least once during each week of operation to
demonstrate that pressure drop is within the required range.

II.B.11.b.2 Recordkeeping:

Pressure drop readings shall be recorded at least once during each week of operation while
the baghouse is operating. Records documenting the pressure drop shall be kept in a log and
shall include the following:

(a) Unit identification;

(b) Manufacturer recommended pressure drop for the unit including the gauge measurement
metric (kPA, mbar, inches of water, etc);

(c) Weekly pressure drop readings with the appropriate metric, consistent with the condition
above (kPA, mbar, inches of water, etc);

(d) Date of reading.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.11.b.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: N/A – See status of condition II.B.11.a.

II.B.12 Two (2) Spray Booths - Built Up Line - Nucor Building Systems

II.B.12.a Condition:

Visible emissions from the spray booth exhaust stacks shall not exceed 5% opacity. [Origin: DAQE-
AN100280019-24]. [R307-401-8]

45

II.B.12.a.1 Monitoring:

Visual observations shall be performed on the spray booth exhaust stacks at least once
during each week that they operate. Visual observations shall be made by an individual
trained on the observation procedures of 40 CFR 60, Appendix A, Method 9. The individual
is not required to be a certified visible emissions observer. If any visible emissions are
observed, an opacity determination shall be performed by a certified visible emissions
observer in accordance with 40 CFR 60, Appendix A, Method 9. The opacity determination
shall be made within 24 hours of the initial opacity survey, or at the beginning of the next
day of Spray Booth operation, whichever period is longer.

II.B.12.a.2 Recordkeeping:

Results of monitoring shall be maintained as described in 40 CFR 60, Appendix A, Method
9, and Provision I.S.1 of this permit.

II.B.12.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – Weekly visual observations are conducted, of the spray booth stacks, by
using Emission Unit Observation Forms. The forms indicate, at time of the inspection, that
no EPA Method 9 VEOs were conducted to date. Method 22 observations are conducted
first to determine if Method 9 observations are required. Hardcopies of the forms are kept in
a three-ring binder.

II.B.12.b Condition:

The permittee shall replace all or part of the filter media when the face velocity has dropped to 100
fpm. [Origin: DAQE-AN100280019-24]. [R307-401-4, R307-401-8]

II.B.12.b.1 Monitoring:

The permittee shall install a manometer or magnehelic pressure gauge to measure the
differential pressure across the filter media of each spray booth bay. To demonstrate
compliance the permittee shall:

(a) Use a portable anemometer during initial operation to determine a correlation between
pressure drop and spray booth face velocity.

(b) Use the correlation to set a reference mark on each manometer or magnehelic pressure
gauge to show the point at which in the future, the face velocity will be assumed to have
dropped to 100 fpm.

(c) Maintain documentation of these measurements.

(d) Conduct inspections on a quarterly basis to verify adequate maintenance.

46

II.B.12.b.2 Recordkeeping:

Records of inspections and maintenance shall be maintained including at a minimum: spray
booth identification, date of inspection, results of inspection, manometer or magnehelic
gauge repairs, and other corrective actions taken.

Records and results of monitoring shall be maintained in accordance with Provision I.S.1 of
this permit.

II.B.12.b.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – Quarterly maintenance inspections are conducted of the spray booths.
The maintenance shop maintains records (Daily Paint Booth Inspection Logs) are kept
electronically. Pre and post readings of the gauges are recorded by each of the three daily
shifts. The filters are replaced as needed.

II.B.13 Two (2) Drying Ovens - Built Up Line - Nucor Building Systems

II.B.13.a Condition:

Visible emissions shall not exceed 10% opacity. [Origin: DAQE-AN100280019-24].
[R307-401-8]

II.B.13.a.1 Monitoring:

In lieu of monitoring via visible emission observations, fuel used shall be monitored to
demonstrate that only natural gas or propane is being combusted.

II.B.13.a.2 Recordkeeping:

An operating log shall be maintained to document any period when plant equipment is
operated using any fuel other than natural gas or propane.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.13.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – The drying ovens are only plumed to burn natural gas. The Operating
Log for the ovens is signed off annually. Fuel records are not required. The ovens
started operations on June 1, 2023.

II.B.14 Flange Line - Nucor Building Systems

II.B.14.a Condition:

Visible emissions shall not exceed 5% opacity. [Origin: DAQE-AN100280019-24].
[R307-401-8]
47

II.B.14.a.1 Monitoring:

In lieu of visible emissions observations, the permittee shall perform a quarterly inspection
to ensure that the baghouse operates inside of the Nucor Building Systems building and does
not vent to the atmosphere.

II.B.14.a.2 Recordkeeping:

Results of quarterly monitoring shall be maintained as described in Provision I.S.1 of this
permit.

II.B.14.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – A quarterly inspection was conducted in the fourth quarter of 2023, when the
Flange Line was installed. Quarterly inspections are conducted to ensure that the baghouse
operates inside the building. Hardcopies of the inspection forms are kept on-site.

II.B.14.b Condition:

The permittee shall operate the baghouse within the static pressure range recommended by the
manufacturer for normal operations. [Origin: DAQE-AN100280019-24]. [R307-401-8]

II.B.14.b.1 Monitoring:

(a) The permittee shall install manometer or magnehelic pressure gauge to measure the
differential pressure across each baghouse.

(b) Each gauge shall be maintained, operated, and calibrated in accordance with
manufacturer recommendations.

(c) Each pressure gauge shall be located such that an inspector/operator can read the
indicator safely at any time.

(d) The permittee shall monitor the baghouse at least once during each week of operation to
demonstrate that pressure drop is within the required range.

II.B.14.b.2 Recordkeeping:

Pressure drop readings shall be recorded at least once during each week of operation while
the baghouse is operating. Records documenting the pressure drop shall be kept in a log and
shall include the following:

(a) Unit identification;

(b) Manufacturer recommended pressure drop for the unit including the gauge measurement
metric (kPA, mbar, inches of water, etc);

(c) Weekly pressure drop readings with the appropriate metric, consistent with the condition
above (kPA, mbar, inches of water, etc);

48

(d) Date of reading.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.14.b.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – The weekly dp readings are recorded. Hardcopies of the reports are kept
on-site. Maintenance is conducted according to the manufacturer. Maintenance inspection are
conducted. Hardcopies of the inspection forms are kept on-site. The Flange Line started
operations on June 1, 2023.

II.B.15 One (1) Shot Blaster - Nucor Building Systems

II.B.15.a Condition:

Visible emissions shall not exceed 5% opacity. [Origin: DAQE-AN100280019-24].
[R307-401-8]

II.B.15.a.1 Monitoring:

In lieu of visible emissions observations, the permittee shall perform a quarterly inspection
to ensure that the baghouse operates inside of the Nucor Building Systems building and does
not vent to the atmosphere.

II.B.15.a.2 Recordkeeping:

Results of quarterly monitoring shall be maintained as described in Provision I.S.1 of this
permit.

II.B.15.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – A quarterly inspection was conducted in the fourth quarter of 2023, when the
Shot Blaster was installed. Quarterly inspections are conducted to ensure that the baghouse
operates inside the building. Hardcopies of the inspection forms are kept on-site.

II.B.15.b Condition:

The permittee shall operate the baghouse within the static pressure range recommended by the
manufacturer for normal operations. [Origin: DAQE-AN100280019-24]. [R307-401-8]

II.B.15.b.1 Monitoring:

(a) The permittee shall install manometer or magnehelic pressure gauge to measure the
differential pressure across each baghouse. The baghouse shall operate within the static
pressure range recommended by the manufacturer for normal operations.

49

(b) Each gauge shall be maintained, operated, and calibrated in accordance with
manufacturer recommendations.

(c) Each pressure gauge shall be located such that an inspector/operator can read the
indicator safely at any time.

(d) The permittee shall monitor the baghouse at least once during each week of operation to
demonstrate that pressure drop is within the required range.

II.B.15.b.2 Recordkeeping:

Pressure drop readings shall be recorded at least once during each week of operation while
the baghouse is operating. Records documenting the pressure drop shall be kept in a log and
shall include the following:

(a) Unit identification;

(b) Manufacturer recommended pressure drop for the unit including the gauge measurement
metric (kPA, mbar, inches of water, etc);

(c) Weekly pressure drop readings with the appropriate metric, consistent with the condition
above (kPA, mbar, inches of water, etc);

(d) Date of reading.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.15.b.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – The weekly dp readings are recorded. Hardcopies of the reports are kept
on-site. Maintenance is conducted according to the manufacturer. Maintenance inspection are
conducted. Hardcopies of the inspection forms are kept on-site. The Shot Blaster started
operations on August 7, 2023.

II.B.16 One (1) Purlin Line Drying Oven - Nucor Building Systems

II.B.16.a Condition:

Visible emissions shall not exceed 10% opacity. [Origin: DAQE-AN100280019-24].
[R307-401-8]

II.B.16.a.1 Monitoring:

In lieu of monitoring via visible emission observations, fuel used shall be monitored to
demonstrate that only natural gas or propane is being combusted.

50

II.B.16.a.2 Recordkeeping:

An operating log shall be maintained to document any period when plant equipment is
operated using any fuel other than natural gas or propane.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.16.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – The Drying Ovens are only plumed to burn natural gas. The Operating
Log for the ovens is signed off on annually. Fuel records are not required.

II.B.17 Accessory Dip Coating - Nucor Building Systems

II.B.17.a Condition:

All dip tanks shall be covered when not in use. [Origin: DAQE-AN100280019-24]. [R307-401-8]

II.B.17.a.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.17.a.2 Recordkeeping:

Records shall include the following:

(a) Dates and times when steel product assembly/painting commences and ends.

(b) Verification that the dip tank covers are in a closed position within one-hour of when
steel product assembly/painting ceased.

Records shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.17.a.3

Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.
Status: In compliance – Hardcopies of the Daily Dip Tank Logs are maintained by the operators. The
records contained dates and times when painting commenced and ended. They also verified
when dip tank covers were in a closed position and when tanks were not in use for 1 hour.

II.B.18 FOAM-1 Line – TrueCore Insulated Panels Building

II.B.18.a Condition:

Visible emissions from the DC-01 Baghouse shall not exceed 5% opacity. [Origin: DAQE-
AN100280019-24]. [R307-201, R307-401-8]

51

II.B.18.a.1 Monitoring:

In lieu of visible emissions observations, the permittee shall perform a quarterly
inspection to ensure that the baghouse operates inside of the TrueCore Insulated Panels
Building and does not vent to the atmosphere.

II.B.18.a.2 Recordkeeping:

Results of quarterly monitoring shall be maintained as described in Provision I.S.1 of this
permit.

II.B.18.a.3 Reporting:

There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance – Quarterly inspections are conducted to ensure that the baghouse operates
inside the Truecore Insulated Panel building. The quarterly inspections that were conducted
on August 2024 and November 2024 were reviewed at time of the inspection. Electronic copies
of the inspection forms are kept on-site. The Foam -1-Line started production in April 2024.

II.B.18.b Condition:

The permittee shall operate the DC-01 Baghouse within the static pressure range recommended by
the manufacturer for normal operations. [Origin: DAQE-AN100280019-23]. [R307-401-8]

II.B.18.b.1 Monitoring:

(a) The permittee shall install a manometer, solid-state electronic, or magnehelic
pressure gauge to measure the differential pressure across the DC-01 Baghouse.

(b) Each gauge shall be maintained, operated, and calibrated in accordance with
manufacturer recommendations.

(c) Each pressure gauge shall be located such that an inspector/operator can safely
read the indicator at any time.
(d) The permittee shall monitor the DC-01 Baghouse at least once during each week of
operation to demonstrate that pressure drop is within the required range.

II.B.18.b.2 Recordkeeping:

Pressure drop readings shall be recorded at least once during each week of operation
while the DC-01 Baghouse is operating. Records documenting the pressure drop shall be
kept in a log and shall include the following:

(a) Unit identification;

(b) Manufacturer recommended pressure drop for the unit including the gauge
measurement metric (kPA, mbar, inches of water, etc);

(c) Weekly pressure drop readings with the appropriate metric, consistent with the
condition above (kPA, mbar, inches of water, etc);
52

(d) Date of reading.

The permittee shall maintain records of the manufacturer recommended pressure ranges and
gauge measurement metric. Documentation of gauge calibration shall be maintained.
Records shall be maintained in accordance with Provision I.S.1 of this permit.

Reporting:
There are no reporting requirements for this provision except those specified in Section I of
this permit.

Status: In compliance - The weekly dp readings are recorded. Electronic copies of the reports are
kept on-site. Maintenance is conducted according to the manufacturer. Maintenance inspection
are conducted. Calibration records could not be provided since this is a new condition. They
will be provided next inspection. Electronic copies of the of the inspection forms are kept
on-site.

II.C Emissions Trading
(R307-415-6a(10))

Not applicable to this source.

II.D Alternative Operating Scenarios.
(R307-415-6a(9))

Not applicable to this source.

II.E Source-specific Definitions.

The following definitions apply to the permittee. They include terms not defined in state or
federal rules or clarify or expand on existing definitions.

Not applicable to this source.

SECTION III: PERMIT SHIELD

III.A A permit shield was not granted for any specific requirements.

SECTION IV: ACID RAIN PROVISIONS

IV.A This source is not subject to Title IV. This section is not applicable.

53

EMISSION INVENTORY: The tri-annual 2023 emission inventory was submitted on April 12, 2024.
See status of condition I.U.

The tri-annual 2026 emission inventory is due before or by April 15, 2027.

PREVIOUS ENFORCEMENT
ACTIONS: None

COMPLIANCE STATUS &
RECOMMENDATIONS: Vulcraft – Division of Nucor Corporation should be considered to be in
compliance with the conditions of the current Title V Operating Permit
300030005, dated November 9, 2023, and revised March 12, 2024, at time
of the inspection.

HPV STATUS: N/A

COMPLIANCE
ASSISTANCE: 1) Discussed revising the 2024 annual compliance certification to include
the devotion of condition II.B.10.c(2). See status of condition I.L.

2) Discussed submitting deviation notices within 14 days of the deviation.
See status of condition I.S.2.

3) Discussed modification of the Title V Operating Permit regarding the
addition of a new administration building emergency generator and a new
Nucor Building Systems emergency generator. Also, the addition of the
Tower & Structure and Automated Wood Bay Processes.
54

RECOMMENDATION FOR
NEXT INSPECTION: Verify that new modified Title V Operating Permit has been issued.
Inspect as usual.

ATTACHMENT: VEO Form
Correspondence
Joe Rockwell <[e-mail]>
Update Process Description for Vulcraft Joist Plant
4 messages
Kuester, Trevette (VUT) <[e-mail]>Mon, Mar 3, 2025 at 2:44 PM
To: Joe Rockwell <[e-mail]>
Joist Plant: The joist plant produces structural beams and weight bearing ceiling joists used in a variety of
building construcon applicaons. There are five different producon lines at the joist plant, they are: the
miniature span line, the short span line, the long span line, the bridging line, and the super long span line.
Raw materials received from NUCOR Steel include steel angles, rods, and bars. This material is received by
rail car and stacked in the receiving and storage area of the joist plant. The pieces are cut, sheared, and bent
to form the right component dimensions for joist rigging. The cut parts are conveyed to the rigging area
where they are arranged on a rigging table to fit the final form and tack welded to secure the shape. The
preassembled joist is then conveyed to the welding area where the parts are permanently arc welded
together, inspected, and repaired if necessary.

The completed joists are then conveyed to the inspecon and painng department. Overhead Gantry
cranes li the completed joists from the conveyor and dip them into long, narrow, dip tanks filled with gray
paint. The coated joist is stacked on a drying rack and pped to drip dry. Aer drying, the joists are loaded
onto a trailer for shipment and storage in the yard area. Forklis are used to stack the completed joists in
storage areas. There are a total of seven dip tanks in the facility. The VOC emissions are controlled over the
dip tanks by closing lids while they are not in use. The welding smoke inside of the building is venlated by
24 electric exhaust fans, which vent outside to the atmosphere.
Trevee Kuester
Environmental Coordinator
[phone]
[e-mail]
CONFIDENTIALITY NOTICE
This e-mail contains privileged and confidential information, which is the property of Nucor, intended only for the use of
the intended recipient(s). Unauthorized use or disclosure of this information is prohibited. If you are not an intended
recipient, please immediately notify Nucor and destroy any copies of this email. Receipt of this e-mail shall not be deemed
a waiver by Nucor of any privilege or the confidential nature of the information.
Joe Rockwell <[e-mail]>Mon, Mar 3, 2025 at 5:05 PM
To: "Kuester, Trevette (VUT)" <[e-mail]>
Thanks Trevette. When do you think you will be able to send the hard copy revised Annual Compliance Certification?
Thanks Again,
3/13/25, 12:59 PM State of Utah Mail - Update Process Description for Vulcraft Joist Plant
https://mail.google.com/mail/u/0/?ik=391b7b8965&view=pt&search=all&permthid=thread-f:1825610955584164365&simpl=msg-f:18256109555841643…1/3
Joe Rockwell | Environmental Scientist
Phone: [phone]

195 North 1950 West, Salt Lake City, UT 84116

Emails to and from this email address may be considered public records and thus subject to Utah GRAMA requirements.
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Kuester, Trevette (VUT) <[e-mail]>Tue, Mar 4, 2025 at 7:39 AM
To: Joe Rockwell <[e-mail]>
I have the revised copy printed off and will mail it this morning.
Trevee Kuester
Environmental Coordinator
[phone]
[e-mail]
From: Joe Rockwell <[e-mail]>
Sent: Monday, March 3, 2025 5:05 PM
To: Kuester, Trevee (VUT) <[e-mail]>
Subject: [EXT] Re: Update Process Descripon for Vulcra Joist Plant

This message came from outside of Nucor.
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Joe Rockwell <[e-mail]>Wed, Mar 5, 2025 at 7:24 PM
To: "Kuester, Trevette (VUT)" <[e-mail]>
Thank You!
Joe Rockwell | Environmental Scientist
Phone: [phone]
3/13/25, 12:59 PM State of Utah Mail - Update Process Description for Vulcraft Joist Plant
https://mail.google.com/mail/u/0/?ik=391b7b8965&view=pt&search=all&permthid=thread-f:1825610955584164365&simpl=msg-f:18256109555841643…2/3

195 North 1950 West, Salt Lake City, UT 84116

Emails to and from this email address may be considered public records and thus subject to Utah GRAMA requirements.
[Quoted text hidden]
3/13/25, 12:59 PM State of Utah Mail - Update Process Description for Vulcraft Joist Plant
https://mail.google.com/mail/u/0/?ik=391b7b8965&view=pt&search=all&permthid=thread-f:1825610955584164365&simpl=msg-f:18256109555841643…3/3
Joe Rockwell <[e-mail]>
Emission Fee SLEIS submission
2 messages
Kuester, Trevette (VUT) <[e-mail]>Fri, Mar 7, 2025 at 10:48 AM
To: Joe Rockwell <[e-mail]>
Hi Joe,
I have been trying to figure out the SLEIS system, I had an account made and can access my facility in the
program. I have tried to figure out where to submit the Emission Fee informaon but have failed. When I
red reaching out to Catherine Williams at 806-536-4000 I haven't been able to get through. Is that the
correct number or is there someone else I can contact to learn about how to use this program?
Trevee Kuester
Environmental Coordinator
[phone]
[e-mail]
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Joe Rockwell <[e-mail]>Fri, Mar 7, 2025 at 12:51 PM
To: "Kuester, Trevette (VUT)" <[e-mail]>
Hey Trevette -
I think Catherine Williams' phone number is 801-536-4008. If her number still does not work, call Greg Mortensen. His
number is 385-226-6171. They should be able to help you out.
Good Luck With SLEIS,
Joe Rockwell | Environmental Scientist
Phone: [phone]

195 North 1950 West, Salt Lake City, UT 84116

3/13/25, 12:57 PM State of Utah Mail - Emission Fee SLEIS submission
https://mail.google.com/mail/u/0/?ik=391b7b8965&view=pt&search=all&permthid=thread-f:1825958487114771106&simpl=msg-f:182595848711477110…1/2
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA requirements.
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3/13/25, 12:57 PM State of Utah Mail - Emission Fee SLEIS submission
https://mail.google.com/mail/u/0/?ik=391b7b8965&view=pt&search=all&permthid=thread-f:1825958487114771106&simpl=msg-f:182595848711477110…2/2