DAQ-2024-007765

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DAQC-391-24
Site ID 10008 (B1)
MEMORANDUM

TO: FILE – NUCOR STEEL

THROUGH: Harold Burge, Major Source Compliance Section Manager

FROM: Jeremiah Marsigli, Environmental Scientist

DATE: April 25, 2024

SUBJECT: FULL COMPLIANCE EVALUATION, Major, Box Elder County,
FRS #UT0000004900300002

INSPECTION DATE: April 18, 2024

SOURCE LOCATION: West Nucor Road, Plymouth, UT
Take exit 392 (Plymouth) from I-15 North. Take a left from exit
and go west to the Nucor entrance. Check in at the scale house.

MAILING ADDRESS: P.O. Box 100, Plymouth, UT 84330

SOURCE CONTACTS: Doug Jones, Environmental Department Manager, 435-458-2415
Mollie Larson, Environmental Department Tech, 435-458-2395
Frank Walker, Environmental Engineer, 435-458-2494
Clay Butler, Bag House Lead, 435-458-2476

OPERATING STATUS: Operating

PROCESS DESCRIPTION:

Nucor Steel is an Electric Arc Furnace (EAF) shop, commonly known as a minimill. The facility is a
recycling center which utilizes scrap steel as a raw feedstock. Scrap steel is purchased from a number of
sources and sorted. The steel is loaded into charge buckets and transported to one of two EAFs. Oxyfuel
burners and electricity are used to melt the steel into a liquid form. Alloys are added until the desired
metallurgy is achieved. The molten material is then continuously molded and cut into billets for
stockpiling. The billets are then reheated and transferred to the rolling mill to be shaped and shipped to
the customer. Nucor is a major source of sulfur dioxide, oxides of nitrogen, PM10, PM2.5, carbon
monoxide, and VOC. Nucor is an area source of HAPs.

APPLICABLE REGULATIONS: Title V Operating Permit #300002004, dated May 23, 2022.
Approval Order (AO) DAQE- AN100080050-24.

NSPS (Part 60), A: General Provisions
NSPS (Part 60), AAa: Standards of Performance for Steel Plants:
Electric Arc Furnaces and Argon-Oxygen Decarburization
Vessels Construction After August 17, 1983

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NSPS (Part) 60), IIII: Standards of Performance for Stationary
Compression Ignition Internal Combustion Engines
NSPS (Part 60), JJJJ Standards of Performance for Stationary
Spark Ignition Internal Combustion Engines
MACT (Part 63), A: General Provisions
MACT (Part 63), CCCCCC: Gasoline Dispensing Facility
MACT (Part 63), ZZZZ: NESHAP for Stationary Reciprocating
Internal Combustion Engines
MACT (Part 63), YYYYY: Electric Arc Furnace Steelmaking
Facilities
(Part 64), CAM

SOURCE EVALUATION:

Title V Operating Permit #300002004, dated May 23, 2022.

SECTION I: GENERAL PROVISIONS

I.A Federal Enforcement.

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)

Status: This is 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 source appeared to be operating in compliance with the conditions of
this permit. See each condition below for more specific 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
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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 appeared to be operating in compliance with the conditions of
this permit. See each condition below for more specific details.

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: The permit expires May 23, 2027. Application for renewal is due November 23, 2026.

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 November 23, 2026.

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 not an inspection item.
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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. Emission fees have been paid as invoiced.

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 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 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. Entry was allowed during this inspection. Records were provided as
requested.

I.K Certification.

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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. All application forms, reports, or compliance certifications submitted
pursuant to this permit in the past year appeared to have contained certification as to its
truth, accuracy, and completeness by a responsible individual as defined in R307-415-3.

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 last certification received by DAQ on February 1, 2024, with a revised
report received March 11, 2024. This report was reviewed under separate cover and found
to meet the requirements of this condition.
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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: This is not an inspection item.

I.N Emergency Provision.

I.N.1 An "emergency" is any situation arising from sudden and reasonably unforeseeable events beyond
the control of the source, including acts of God, which situation requires immediate corrective
action to restore normal operation, and that causes the source to exceed a technology-based
emission limitation under this permit, due to unavoidable increases in emissions attributable to the
emergency. An emergency shall not include noncompliance to the extent caused by improperly
designed equipment, lack of preventive maintenance, careless or improper operation, or operator
error. (R307-415-6g(1))

I.N.2 An emergency constitutes an affirmative defense to an action brought for noncompliance with
such technology-based emission limitations if the affirmative defense is demonstrated through
properly signed, contemporaneous operating logs, or other relevant evidence that:

I.N.2.a An emergency occurred and the permittee can identify the causes of the emergency.
(R307-415-6g(3)(a))

I.N.2.b The permitted facility was at the time being properly operated. (R307-415-6g(3)(b))

I.N.2.c During the period of the emergency the permittee took all reasonable steps to minimize levels of
emissions that exceeded the emission standards, or other requirements in this permit.
(R307-415-6g(3)(c))
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I.N.2.d The permittee submitted notice of the emergency to the Director within two working days of the
time when emission limitations were exceeded due to the emergency. This notice must contain a
description of the emergency, any steps taken to mitigate emissions, and corrective actions taken.
This notice fulfills the requirement of Provision I.S.2.c below. (R307-415-6g(3)(d))

I.N.3 In any enforcement proceeding, the permittee seeking to establish the occurrence of an emergency
has the burden of proof. (R307-415-6g(4))

I.N.4 This emergency provision is in addition to any emergency or upset provision contained in any
other section of this permit. (R307-415-6g(5))

Status: In Compliance. No emergency events were reported or recorded during the 12-month
period preceding this inspection.

I.O Operational Flexibility.

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

Status: This is not an inspection item.

I.P Off-permit Changes.

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

Status: This is not an inspection item.

I.Q Administrative Permit Amendments.

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

Status: This is not an inspection item.

I.R Permit Modifications.

Permit modifications are governed by R307-415-7f.

Status: This is not an inspection item.

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))

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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.

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))

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

Environmental Protection Agency, Region VIII
Office of Partnerships and Regulatory Assistance Air and Radiation Program (mail code 8P-AR)
1595 Wynkoop Street
Denver, CO 80202-1129
Phone: [phone]

Status: In Compliance. Records are kept as required. Monitoring reports have been submitted
every six months. Deviations have been reported as required by I.S.2.c.

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))

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: This is not an inspection item.

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. Emission inventories have been submitted as required.

I.V Title IV and Other, More Stringent Requirements

Where an applicable requirement is more stringent than an applicable requirement of regulations
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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 not an inspection item.

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 Melt Shop Equipment and Operations
Equipment and operations including the two (2) 65-ton electric arc furnaces listed in
II.A.3, skull lancing; natural gas-fired horizontal and vertical ladle preheaters; tundish
preheaters; ladle/ tundish demolition, reconstruction, rebricking and torching. Controlled
by the EAF baghouse. Included in II.A.8. Melt Shop Equipment and Operations are
subject to 40 CFR 60 Subpart AAa.

II.A.3 Two (2) 65-Ton Electric Arc Furnaces
Two (2) 65-ton electric arc furnaces listed in II.A.2. Includes natural gas oxy-fuel fired
burners and oxygen lances, flux/carbon addition and injection systems. Controlled by a
direct emission control (DEC) system during melting/refining and by a canopy evacuation
system during charging/tapping. All exhaust to the EAF baghouse. Included in II.A.8.
Two (2) 65-Ton Electric Arc Furnaces are subject to 40 CFR 60 Subpart AAa.

II.A.4 Two (2) Lime/Dolomite Silos
Two (2) lime/dolomite storage silos controlled by fabric filter baghouses. Included in
II.A.19.

II.A.5 Lime, Fluorspar, Charge Carbon, and Alloy Handling
Material handling including delivery, stockpiling, conveyor and batching operations of
lime, fluorspar, charge carbon, and alloy. Additive batching operations of lime, alloy etc.
are included in II.A.19.

II.A.6 Four (4) Carbon Silos
Four (4) carbon silos consisting of two (2) carbon process silos and two (2) carbon storage
silos. The two (2) carbon process silos have individual baghouses with vents and are
included in II.A.19. The two (2) carbon storage silos vent back to the declumper which is
controlled by the EAF baghouse and are included in II.A.8.

II.A.7 Raw Material Handling Systems
Material handling systems for the Northeast Rail Station and Melt Shop Station(s)
including alloy, coal, flux unloading, storage, charge bucket loading and batching
operations. Additive batching operations of lime, alloy etc. are included in II.A.19.

II.A.8 EAF Baghouse Vent
Emissions from the EAF furnaces captured by either the DEC or canopy flow through a
spark arrestor then through the EAF baghouse before being vented to the atmosphere.
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Includes II.A.2, II.A.3, II.A.10, and two (2) carbon storage silos in II.A.6. EAF Baghouse
Vent subject to 40 CFR 60 Subpart AAa, 40 CFR 63 Subpart YYYYY, 40 CFR 64
Compliance Assurance Monitoring (CAM).

II.A.9 EAF Dust Handling Equipment
Includes EAF dust loading into gondola cars, EAF baghouse hoppers and conveyors, EAF
baghouse material storage silo, and EAF dust loading to rail cars/trucks.

II.A.10 Caster and Associated Equipment
Continuous casting system with provisions for alloy addition; supplemental oxygen
injection heating; backup alloy stir station; and automatic and manual torching operations
to cut billets to length. Control: EAF baghouse. Included in II.A.8.

II.A.11 Billet Reheat Furnace #1
Natural gas/propane fired furnace with a capacity of 1320 MMcf/yr. Control: Low NOx
burners.

II.A.12 Billet Reheat Furnace #2
Natural gas/propane fired furnace with a capacity of 980 MMcf/yr. Control: Ultra-low
NOx burners.

II.A.13 Hot Steel Rolling Operations
Hot steel rolling operations venting to internal baghouses. No unit specific applicable
requirements.

II.A.14 Six (6) Water Cooling Systems
Six (6) water cooling systems including one (1) new system with two (2) towers.
Controlled by high-efficiency drift eliminators (0.0006%). No unit specific applicable
requirements.

II.A.15 Fugitives from Unpaved Haul Roads and Service Roads
Fugitive emissions from unpaved haul roads and service roads.

II.A.16 Fugitives from Paved Haul Roads and Service Roads
Fugitive emissions from paved haul roads and service roads.

II.A.17 Scrap Steel Stockpiles
Includes scrap steel delivery, stockpiles, and loading. No unit specific applicable
requirements.

II.A.18 Fuel Storage Tanks
Diesel and gasoline tanks each with a capacity less than 19,812 gallons. 40 CFR 63
Subpart CCCCCC applies to gasoline tanks.

II.A.19 Selected 10% Opacity Emission Units
Two (2) Lime/Dolomite Silos Baghouses listed in II.A.4, Two (2) Carbon Process Silos
Baghouses listed in II.A.6, Ladle Vacuum Degasser listed in II.A.29, Fabrication Shop Baghouse
listed in II.A.30, Roll Mill #1 Jump Mill Baghouse and Abrasive Saw Shack Baghouse listed in
II.A.31, and Additive (coke breeze, feldspar, alloys, lime, etc.) Batching Operations listed in II.A.5
& II.A.7.

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II.A.20 Miscellaneous Emissions
Includes emissions from water desalination plant, acetylene combustion, natural
gas/propane combustion for comfort heating, slag handling, lab, HCl storage tank, used oil
storage tanks, propane tank venting, and water heaters. No unit specific applicable
requirements.

II.A.21 Sandblasting Station(s)
Miscellaneous sandblasting operations.

II.A.22 One (1) Diethylene Glycol Storage Tank
Above ground diethylene glycol storage tank, 12,000-gallon capacity, holding material <
0.05 mmHg. No unit specific applicable requirements.

II.A.23 VOCs from Evaporative Sources
Miscellaneous solvent (including parts washers), cleaners (excluding janitorial), painting, and
rolling mill oil & grease. No unit specific applicable requirements.

II.A.24 Paint Dip Line
Fence post paint dip operations.

II.A.25 NSPS Emergency Compression Ignition Internal Combustion Engines (CI ICE)
Engines subject to 40 CFR 60 Subpart IIII including one (1) 66 hp diesel emergency
reheat cooling water pump engine, two (2) 51 hp or less diesel emergency truck scale
generators, and two (2) 368 hp diesel emergency main pumphouse cooling water pump
engines (manufactured in 1985 but reconstructed after June 12, 2006).

II.A.26 NSPS Spark Ignition Internal Combustion Engines (SI ICE)
Engines subject to 40 CFR 60 Subpart JJJJ including two (2) 4.3L natural gas emergency
mold water pump engines, two (2) 460 hp or less natural gas emergency generator sets,
one (1) 100 hp or less natural gas emergency generator, and six (6) small (less than 25 hp)
gasoline emergency generators, and two (2) natural gas EAF Hydraulic Engines.

II.A.27 NESHAP Existing Emergency CI ICE less than 500 hp
Engines subject to 40 CFR 63 Subpart ZZZZ including one (1) 66 hp diesel emergency
reheat cooling water pump engine.

II.A.28 Emergency Water Pump Engines
Emergency water pump engines including two (2) 66 hp diesel emergency reheat cooling
water pump engines, two (2) 368 hp diesel emergency main pumphouse cooling water
pump engines, and two (2) 4.3L natural gas emergency mold water pump engines. Listed
in II.A.25, II.A.26, and II.A.27.

II.A.29 Ladle Vacuum Degasser Equipped with a Flare
Ladle vacuum degasser. Burner rating: 0.005 lb NOx/ton. Control: Flare. Included in
II.A.19.

II.A.30 Maintenance Building Equipment
Fabrication Shop Baghouse.

II.A.31 Roll Mill #1
Product rolling mill with heat retention boxes (vent inside the building). Controls: Jump
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Mill Baghouse and Abrasive Saw Shack Baghouse. Included in II.A.19

II.A.32 Unpowered Ladle Stir Stations/Powered Ladle Metallurgy Furnaces (LMFs)
LMFs are electric powered. No unit specific applicable requirements.

Status: In Compliance. No unapproved equipment was observed. See evaluation of
DAQE-AN100080050-24 for up-to-date equipment list.

II.B Requirements and Limitations

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

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

II.B.1.a Condition:

Visible emissions shall not exceed 20% opacity except as otherwise specified in this permit.
[Origin: DAQE-AN100080048-21]. [R307-401-8]

II.B.1.a.1 Monitoring:

A visual opacity survey of each affected emission unit shall be performed on a weekly basis by an
individual trained on the observation procedures of 40 CFR 60, Appendix A, Method 9. If visible
emissions other than steam are observed from an emission unit, an opacity determination of that
emission unit shall be performed by a certified observer within 24 hours of the initial survey. The
opacity determination shall be performed in accordance with 40 CFR 60, Appendix A, Method 9.

When the survey is conducted by a certified observer, the opacity of each visible emission may be
estimated and a reference method observation made of the emission point of highest estimated
opacity. If this observation shows compliance with this limitation, no further observations are
necessary. If compliance is not demonstrated, reference method observations shall be conducted
of each point in order of estimated opacity until an observation shows compliance.

II.B.1.a.2 Recordkeeping:

Results of monitoring 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. No visible emissions or fugitive dust were observed during this inspection.
Paved and unpaved roadways and work areas had been watered prior to this inspection, and
remained wet throughout the duration of this inspection. Weekly opacity observations have
been performed and recorded.

II.B.1.b Condition:

Natural gas consumption shall be no greater than 2,340 MMSCF per rolling 12-month period not
14

including fuel consumed by oxyfuel burners for the two (2) EAFs. [Origin: DAQE-
AN100080048-21]. [R307-401-8]

II.B.1.b.1 Monitoring:

Natural gas consumption shall be determined using vendor billing statements for the previous
twelve months. Records shall include the appropriate conversion of acf to scf, as recommended by
the vendor. The permittee shall install a meter or meters, which measures the amount of natural
gas consumed by the EAF oxy-fuel burner. The amount of fuel consumed by the EAF oxyfuel
burners may be subtracted from the total natural gas consumption. The previous 12-month total
shall be documented by the 20th day of each month.

II.B.1.b.2 Recordkeeping:

Results of monitoring shall be maintained in accordance with 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. Natural gas consumption for the 12-month period ending March 31, 2024,
was 1,517 MMSCF.

II.B.1.c Condition:

Propane consumption shall be no greater than 2,800,000 gallons per rolling 12-month period.
[Origin: DAQE-AN100080048-21]. [R307-401-8]

II.B.1.c.1 Monitoring:

The permittee shall install a meter or meters, which measures the volume of propane-consumed
plant wide. Propane consumption shall be determined by records of propane consumed plant wide
for the previous twelve months. The previous 12-month total shall be documented by the 20th day
of each month.

II.B.1.c.2 Recordkeeping:

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

II.B.1.c.3 Reporting:

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

Status: Not applicable. Propane is no longer used and the tanks have been removed.

II.B.1.d

Condition:

At all times, including periods of startup, shutdown, and malfunction, the owners and operators
shall, to the extent practicable, maintain and operate any equipment approved under DAQE-
15

AN100080048-21, including associated air pollution control equipment, in a manner consistent
with good air pollution control practice for minimizing emissions. Determination of whether
acceptable operating and maintenance procedures are being used will be based on information
available to the Director which may include, but is not limited to, monitoring results, opacity
observations, review of operating and maintenance procedures, and inspection of the source. All
maintenance performed on equipment authorized by DAQE-AN100080048-21 shall be recorded.
[Origin: DAQE-AN100080048-21]. [40 CFR 60.11(d), R307-401-4]

II.B.1.d.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.1.d.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.d.3 Reporting:

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

Status: In Compliance. The plant appeared to be maintained and operated in a manner consistent
with good air pollution control practice for minimizing emissions. Nucor Bar Mill utilizes an
electronic tracking system (E.B.S. work order system) to schedule and record all
maintenance activities. Daily shift entries record performance checks and unscheduled
maintenance activities. Additionally, a preventative maintenance (PM) schedule is set and
the company shuts down for a dedicated preventative maintenance day every week,
alternating between short PM activities and long PM activities.

II.B.1.e Condition:

The owner/operator shall install and operate water sprays as necessary on all conveyor transfer
points and batching equipment drop points to meet the opacity limits in Condition II.B.1.j and
Condition II.B.10.a respectively. Water sprays are not required on enclosed transfer/drop points.
[Origin: DAQE-AN100080048-21]. [R307-401-8]

II.B.1.e.1 Monitoring:

The monitoring requirements in II.B.1.j.1 for conveyor transfer points and II.B.10.a.1 for batching
equipment drop points shall be used to determine if water sprays are adequate.

II.B.1.e.2 Recordkeeping:

Results of monitoring 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. All conveyor transfer and drop points are enclosed. Water sprays are not
required.
16

II.B.1.f Condition:

The permittee shall comply with the applicable requirements for servicing of motor vehicle air
conditioners pursuant to 40 CFR 82, Subpart B - Servicing of Motor Vehicle Air Conditioners.
[Origin: 40 CFR 82.30(b)]. [40 CFR 82.30(b)]

II.B.1.f.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 B.

II.B.1.f.2 Recordkeeping:

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

II.B.1.f.3 Reporting:

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

Status: In Compliance. The company has certified compliance with this condition in the most recent
annual compliance certification.

II.B.1.g 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 82.150(b)]. [40 CFR 82.150(b)]

II.B.1.g.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.g.2 Recordkeeping:

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

II.B.1.g.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 company has certified compliance with this condition in the most recent
annual compliance certification.

II.B.1.h Condition:

A Risk Management Plan (RMP) developed in accordance with 40 CFR 68 shall be submitted to
17

the United States Environmental Protection Agency (USEPA) not later than the applicable date in
40 CFR 68 when the source becomes subject to the rule. [Origin 40 CFR 68]. [40 CFR 68]

II.B.1.h.1 Monitoring:

The record serves as monitoring.

II.B.1.h.2 Recordkeeping:

A copy of the Risk Management Plan shall be available to the Director upon request along with a
copy of the transmittal letter to EPA.

II.B.1.h.3 Reporting:

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

Status: Not Applicable. The permittee is no longer required to have a Risk Management Plan.

II.B.1.i Condition:

The permittee shall submit a fugitive dust control plan to the Director in accordance with
R307-309-6. If site modifications that result in emission changes are made, the permittee shall
submit an updated fugitive dust control plan. [Origin: R307-309-6]. [R307-309-6]

II.B.1.i.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.1.i.2 Recordkeeping:

A copy of the fugitive dust control plan shall be maintained on-site.

Records of measures taken to control fugitive dust shall be maintained to demonstrate adherence
to the most recently approved fugitive dust control plan

Records shall be maintained as described in 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: In Compliance. The company has submitted a Fugitive Dust Control Plan which was
approved in 2013. Paved areas are swept periodically and roads are watered on an as-
needed basis. The permittee fills out a job assessment sheet for each project which accounts
for potential new, temporary sources of dust. Records were made available at the time of
this inspection.

II.B.1.j Condition:

Fugitive emissions shall not exceed 15% opacity unless otherwise specified in this permit. [Origin:
DAQE-AN100080048-21, R307-309-4]. [R307-309-4]
18

II.B.1.j.1 Monitoring:

A visual opacity survey of each affected emission unit shall be performed on a weekly basis by an
individual trained on the observation procedures of 40 CFR 60, Appendix A, Method 9. If visible
emissions other than steam are observed from an emission unit, an opacity determination of that
emission unit shall be performed by a certified observer within 24 hours of the initial survey. The
opacity determination shall be performed in accordance with 40 CFR 60, Appendix A, Method 9.

If any partially enclosed handling and unloading point is located in a building, the permittee shall
conduct opacity observations on visible emissions from the building.

When the survey is conducted by a certified observer, the opacity of each visible emission may be
estimated and a reference method observation made of the emission point of highest estimated
opacity. If this observation shows compliance with this limitation, no further observations are
necessary. If compliance is not demonstrated, reference method observations shall be conducted
of each point in order of estimated opacity until an observation shows compliance.

II.B.1.j.2 Recordkeeping:

Results of monitoring 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. No fugitive emissions were observed during this inspection. Weekly opacity
observations have been performed and recorded.

II.B.1.k Condition:

Any salt applied to roads by the permittee shall be at least 92% by weight sodium chloride (NaCl),
magnesium chloride (MgCl2), calcium chloride (CaCl2), and/or potassium chloride (KCl). If the
permittee applies an abrasive such as crushed slag or sand, or applies salt that is less than 92% by
weight NaCl, MgCl2, CaCl2, and/or KCl to roads, the permittee shall either:

(a) Demonstrate to the Director that the material applied has no more PM10 or PM2.5 emissions
than salt which is at least 92% by weight NaCl, MgCl2, CaCl2, and/or KCl; or

(b) Vacuum sweep every arterial roadway (principal and minor) to which the material was applied
within three days of the end of the storm for which the application was made.

[Origin: R307-307]. [R307-307-4, R307-307-5]

II.B.1.k.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.1.k.2 Recordkeeping:

The following records shall be maintained as outlined in Provision I.S.1 of this permit:
19

(1) For Salt - The quantity applied, the percent by weight of insoluble solids in the salt,
and the percentage of the material that is NaCl, MgCl2, CaCl2, or KCl.

(2) For Abrasives (such as sand or crushed slag) - The quantity applied and the percent by
weight of fine material which passes the number 200 sieve in a standard gradation
analysis.

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. Road salt has been applied and records kept. According to receipts from
Compass Minerals, the purchased road salt contains 95-100% by weight NaCl.

II.B.1.l Condition:

The permittee shall ensure that the following conditions are met for all cold VOC containing
solvent parts washers:

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 2 kPa (15 mm Hg 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 must 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;
20

(b) water cover if the solvent is insoluble in and heavier than water;

(c) other systems of equivalent control, such as a refrigerated chiller or carbon absorption.

7) If used, the solvent spray shall be a solid fluid stream at a pressure which does not cause
excessive splashing and may not be a fine, atomized or shower type spray.

[Origin: R307-335-4]. [R307-335-4]

II.B.1.l.1 Monitoring:

A visual observation shall be conducted monthly for all equipment and applicable work practices.

II.B.1.l.2 Recordkeeping:

Results of monthly inspections and the volatility of the solvent(s) being used shall be recorded and
maintained as described in Provision I.S.1 of this permit.

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. Only NON-VOC solvents are used in on-site part washers. However,
monthly inspections of the washers have still been conducted and recorded.

II.B.1.m Condition:

The permittee shall only combust diesel fuel (fuel oil #1, #2, or diesel fuel oil additives) on site.
All diesel burned shall meet the definition of ultra-low sulfur diesel (ULSD), and contain no more
than 15 ppm sulfur. [DAQE-AN100080048-21]. [R307-203-1(1), R307-401-8]

II.B.1.m.1 Monitoring:

The permittee shall demonstrate compliance with the diesel fuel requirements by either:

1. Maintenance of fuel purchase invoices that indicate the diesel fuel meets the
ULSD requirements; or

2. Obtaining certification of the diesel fuel sulfur content from the fuel supplier.

II.B.1.m.2 Recordkeeping:

Compliance with the above diesel fuel requirements shall be demonstrated by maintaining fuel
purchase records showing sulfur content of the delivered fuel. Results of monitoring shall be
maintained in accordance with Provision I.S.1 of this permit.

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. The most recent fuel oil deliver was Ultra Low Sulfur Diesel from Holly.
21

II.B.1.n Condition:

By April 28, 2023, the permittee shall submit documentation to the Director on the status of
construction of the cooling tower system and the four (4) 4.66 MMBtu/hr replacement burners.
The referenced approval order (AO) may become invalid if construction is not commenced by
April 28, 2023 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-AN100080048-21]. [R307-401-18]

II.B.1.n.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.1.n.2 Recordkeeping:

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.n.3 Reporting:

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

Status: In Compliance. A notice of installation, dated May 12, 2022, regarding the four replacement
burners has been submitted to the DAQ. Discussions between the DAQ and Nucor initially
considered the new cooling tower to be a Replacement-in-Kind (RIK). However, upon
further evaluation, the DAQ has determined that the new cooling tower does not meet the
definition of RIK based on the increased emissions, and the new tower is now considered to
be a replacement. DAQE-AN100080050-24 accounts for this equipment change.

II.B.1.o Condition:

By December 1, 2022 the permittee shall install the second 51 hp or less diesel emergency
generator. At that time the permittee shall notify the Director in writing on the status of the
installation. To ensure proper credit when notifying the Director, send the documentation to the
Director, Attn: NSR Section. [Origin: DAQE-AN100080048-21]. [R307-401-18, R307-401-8]

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 second 51 hp or less diesel emergency generator has not been installed.
Nucor submitted a letter stating that plans to install new equipment have been cancelled.
This information is also included in the most recent annual compliance certification.
22

II.B.1.p Condition:

By June 10, 2022, the permittee shall submit documentation to the Director on the status of
construction of the carbon and flux handling system. The referenced approval order (AO) may
become invalid if construction is not commenced by June 10, 2022 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-
AN100080048-21]. [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.

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. A notice dated June 7, 2022, was submitted indicating that the carbon and
flux handling system will not be installed.

II.B.1.q Condition:

The permittee shall not exceed 1.42 million tons of steel production per rolling 12-month period.
[DAQE-AN100080048-21]. [R307-401-8]

II.B.1.q.1 Monitoring:

The permittee shall maintain a log of monthly production rates demonstrating compliance with the
rolling 12-month total. The permittee shall calculate a new 12-month total by the 20th day of each
month using data from the previous 12 months.

II.B.1.q.2 Recordkeeping:

Records of production shall be kept for all periods when the plant is in operation. Results of
monitoring shall be maintained in accordance with Provision I.S.1 of this permit.

II.B.1.q.3 Reporting:

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

Status: In Compliance. Steel production for the 12-month period ending March 31, 2024, was
929,254 million tons.

23

II.B.1.r Condition:

The permittee shall use only natural gas or propane as a fuel in the steel making processes.
[Origin: DAQE-AN100080048-21]. [R307-401-8]

II.B.1.r.1 Monitoring:

Fuel type and usage shall be monitored and recorded to demonstrate that only natural gas or
propane is being used as fuel in the steel making process.

II.B.1.r.2 Recordkeeping:

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

II.B.1.r.3 Reporting:

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

Status: In Compliance. Only natural gas is used for steel production.

II.B.1.s Condition:

Permittee shall not have active exterior coke breeze or feldspar stockpiles on site. [DAQE-
AN100080048-21]. [R307-401-8]

II.B.1.s.1 Monitoring:

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

II.B.1.s.2 Recordkeeping:

Records shall be kept anytime coke breeze or feldspar stockpiles are located at the Nucor
manufacturing site. Results of monitoring shall be maintained in accordance with Provision I.S.1
of this permit.

II.B.1.s.3 Reporting:

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

Status: In Compliance. There are no coke breeze or feldspar stockpiles on-site.

II.B.1.t Condition:

(1) For all solvent cleaning operations, the permittee shall not use solvent products with a VOC
content greater than the amounts specified in Table 1.

24

Table 1 Solvent Cleaning VOC Limits
(excluding water and solvents exempt from the definition of
volatile organic compounds found in R307-101-2)

Solvent Cleaning Category VOC Limit (lb/gal) (g/L)
Coatings, adhesives and ink manufacturing 4.2 500
Electronic parts and components 4.2 500
Medical devices and pharmaceutical
Tools, equipment and machinery 6.7 800
General surface cleaning 5.0 600
Screening printing operations 4.2 500
Semiconductor tools, maintenance and equipment cleaning 6.7 800
Advanced composites manufacturing 6.7 800

(2) As an alternative to the limits in Table 1 and for all general miscellaneous cleaning operations,
the permittee may use a cleaning material with a VOC composite vapor pressure no greater
than 8 mm Hg at 20 degrees Celsius.

(3) The permittee shall store used applicators and shop towels in closed fireproof containers.

(4) These requirements do not apply to the exemptions listed in R307-304-3, including:

(a) Operations that are subject to R307-342 through R307-347 and R307-349 through
R307-355.
(b) Shipbuilding and repair and fiberglass boat manufacturing materials.

(c) Operations that are exclusively covered by Department of Defense military technical data
and performed by a Department of Defense contractor and/or on site at installations owned
and/or operated by the United States Armed Forces are exempt from the requirements of
R307-304.

(d) Janitorial cleaning.

(e) Graffiti removal.

(f) Solvent cleaning in laboratory tests and analysis and research and development projects.

(g) Cleaning with aerosol products.

(h) Cleaning solvents that are defined as a consumer product in R307-357.

(i) Cleaning of solar cells, laser hardware, scientific instruments, and high-precision optics.

(5) If an add-on control system is used, the permittee shall install and maintain the add-on control
system in accordance with the manufacturer recommendations and maintain an overall capture
and control efficiency of at least 85%.

[Origin: R307-304]. [R307-304]

II.B.1.t.1 Monitoring:

25

Records required for this permit condition will serve as monitoring.

II.B.1.t.2 Recordkeeping:

The permittee shall maintain records demonstrating compliance with this condition. Records shall
include:

(a) VOC content or composite vapor pressure of the solvent product applied.

(b) If an add-on control device is used, key system parameters necessary to ensure
compliance with R307-304-7.

(i) Key system parameters must include, but are not limited to, temperature,
pressure, flow rates, and an inspection schedule.

(ii) Key inspection parameters must be in accordance with the manufacturer's
recommendations, and as required to demonstrate operations are providing
continuous emission reduction from the source during all periods that the
operations cause emissions from the source.

Records shall be maintained in accordance with Provision I.S.1 of this permit and shall be
available to the director upon request.

II.B.1.t.3 Reporting:

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

Status: In Compliance. A VOC-free solvent cleaner from Lyn Distribution is used.

II.B.1.u 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]

26

II.B.1.u.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.1.u.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.u.3 Reporting:

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

Status: In Compliance. The permittee has implemented a management of change process before
product transfers to ensure only compliant materials are used.

II.B.1.v 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.v.1 Monitoring:

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

II.B.1.v.2 Recordkeeping:

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

II.B.1.v.3 Reporting:

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

Status: In Compliance. The permittee has certified compliance with this condition in the most
recent annual compliance certification.

II.B.2 Conditions on Melt Shop Equipment and Operations.

27

II.B.2.a Condition:

Visible emissions shall not exceed 6% opacity for emissions from the melt shop and due solely to
the operation of any Electric Arc Furnaces EAF(s) [Origin: DAQE-AN100080048-21].
[40 CFR 60.272a(a)(3), 40 CFR 63.10686(d)(6), R307-401-8]

II.B.2.a.1 Monitoring:

Visible emissions determinations shall be performed by a certified visible emission observer at
least once per day of operation. The determinations shall occur when at least one (1) of the
furnaces is operating in the melting and refining period. The arithmetic average of 24 consecutive
15-second opacity observations shall be taken in accordance with 40 CFR 60, Appendix A,
Method 9. The opacity shall be recorded for any point(s) where visible emissions are observed.
Where it is possible to determine that a number of visible emission sites relate to only one incident
of visible emissions, only one opacity determination will be required. In this case, the opacity
determination must be made for the site of highest opacity that directly relates to the cause (or
location) of visible emissions observed during a single incident.

II.B.2.a.2 Recordkeeping:

The permittee shall maintain all records required by this provision and all data required by 40 CFR
60 Appendix A, Method 9 and in accordance with 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. No visible emissions were observed during this inspection. Daily opacity
observations have been performed and recorded.

II.B.2.b Condition:

Melt shop hours of operation shall not exceed 8,220 hours per rolling 12-month period. [Origin:
DAQE-AN100080048-21]. [R307-401-8]

II.B.2.b.1 Monitoring:

The permittee shall calculate, by the 20th day of each month, a 12-month total based on the first
day of each month using data from the previous 12 months. Hours of operation shall be
determined by supervisor's monitoring and maintenance of a daily operations log.

II.B.2.b.2 Recordkeeping:

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

II.B.2.b.3 Reporting:

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

Status: In Compliance. Melt Shop hours of operation for the 12-month period ending March 31,
2024, were 6,810 hours.
28

II.B.3 Conditions on EAF Baghouse Vent.

II.B.3.a Condition:

Visible emissions shall be less than 3% opacity [Origin: DAQE-AN100080048-21].
[40 CFR 60.272a(a)(2), R307-401-8]

II.B.3.a.1 Monitoring:

In lieu of installing a continuous opacity monitoring system, the permittee shall demonstrate
compliance with the visible emission limitation by monitoring the following.

a) Visible emissions determinations shall be performed by a certified visible emission
observer at least once per day of operation. The determinations shall occur when at
least one (1) of the furnaces is operating in the melting and refining stage. These
observations shall be taken in accordance with 40 CFR 60, Appendix A, Method 9,
and, for at least three 6-minute periods, the opacity shall be recorded for any point(s)
where visible emissions are observed. Where it is possible to determine that a number
of visible emission sites relate to only one incident of the visible emissions, only one
set of three 6-minute opacity determinations will be required. In this case, the opacity
determination must be made for the site of highest opacity that directly relates to the
cause (or location) of visible emissions observed during a single incident.

b) A bag leak detection system meeting the following specifications and requirements
shall be installed and continuously operated on the affected emission unit.

i) The bag leak detection system shall be certified by the manufacturer to be
capable of detecting particulate matter emissions at concentrations of 1 milligram
per actual cubic meter (0.00044 grains per actual cubic foot) or less.

ii) The bag leak detection system sensor shall provide output of relative particulate
matter loadings and the owner or operator shall continuously record the output
from the bag leak detection system using electronic or other means (e.g., using a
strip chart recorder or a data logger) at a minimum of once per shift.

iii) The bag leak detection system shall be equipped with an alarm system that will
sound when an increase in relative particulate loading is detected over the alarm
set point established according to paragraph (iv). The alarm shall be located such
that it can be heard by the appropriate plant personnel.

iv) For the bag leak detection system, the permittee developed and submitted to the
Director, for approval, a site-specific monitoring plan that addresses the items
identified in (a) through (e) below. For each bag leak detection system that
operates based on the triboelectric effect, the monitoring plan shall be consistent
with the recommendations contained in the U.S. Environmental Protection
Agency guidance document "Fabric Filter Bag Leak Detection Guidance" (EPA-
454/R-98-015). The permittee shall operate and maintain the bag leak detection
system according to the site-specific monitoring plan at all times. The plan shall
describe the following:

(a) Installation of the bag leak detection system;
29

(b) Initial and periodic adjustment of the bag leak detection system including
how the alarm set-point will be established;

(c) Operation of the bag leak detection system including quality assurance
procedures;

(d) How the bag leak detection system will be maintained including a routine
maintenance schedule and spare parts inventory list; and

(e) How the bag leak detection system output shall be recorded and stored.

v) The initial adjustment of the system shall, at a minimum, consist of establishing
the baseline output by adjusting the sensitivity (range) and the averaging period
of the device, and establishing the alarm set points and the alarm delay time (if
applicable).

vi) Following initial adjustment, the permittee shall not adjust the averaging period,
alarm set point, or alarm delay time without approval from the Director except as
provided for in (a) and (b) below.

(a) Once per quarter, the permittee may adjust the sensitivity of the bag leak
detection system to account for seasonal effects including temperature and
humidity according to the procedures identified in the site-specific
monitoring plan required under paragraph (iv) above.

(b) If opacities greater than zero percent are observed over four consecutive 15-
second observations during the daily opacity observations required under
II.B.3.a.1.a and the alarm on the bag leak detection system does not sound,
the permittee shall lower the alarm set point on the bag leak detection system
to a point where the alarm would have sounded during the period when the
opacity observations were made.

vii) For negative pressure, induced air baghouses, and positive pressure baghouses
that are discharged to the atmosphere through a stack, the bag leak detection
sensor shall be installed downstream of the baghouse and upstream of any wet
scrubber.

viii) Where multiple detectors are required, the system's instrumentation and alarm
may be shared among detectors.

ix) The permittee shall initiate procedures to determine the cause of all alarms within
1 hour of an alarm. The cause of the alarm shall be alleviated within 3 hours of
the time the alarm occurred by taking whatever corrective action(s) are
necessary. Corrective actions may include, but are not limited to, the following:

(a) Inspecting the baghouse for air leaks, torn or broken bags or filter media, or
any other condition that may cause an increase in particulate emissions;

(b) Sealing off defective bags or filter media;

30

(c) Replacing defective bags or filter media or otherwise repairing the control
device;

(d) Sealing off a defective baghouse compartment;

(e) Cleaning the bag leak detection system probe or otherwise repairing the bag
leak detection system;

(f) Shutting down the process producing the particulate emissions.

II.B.3.a.2 Recordkeeping:

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

Additionally, the following shall be maintained in accordance with Provision I.S.1 of this
permit for each bag leak detection system.

a) Records of the bag leak detection system output at a minimum of once per shift;

b) Records of bag leak detection system adjustments, including the date and time of the
adjustment, the initial bag leak detection system settings, and the final bag leak
detection system settings; and

c) Records of the date and time of all bag leak detection system alarms, the time that
procedures to determine the cause of the alarm were initiated, if procedures were
initiated within 1 hour of the alarm, the cause of the alarm, an explanation of the
actions taken, the date and time the cause of the alarm was alleviated, and if the alarm
was alleviated within 3 hours of the alarm. [40 CFR 60.276a(h)(1)-(3)]

II.B.3.a.3 Reporting:

In addition to the reporting requirements specified in Section I of this permit, the permittee
shall submit a written report of exceedances of the control device opacity to the Director
semi-annually. Exceedances are defined as all 6-minute periods during which the average
opacity is 3 percent or greater. [40 CFR 60.276a(b)]

Status: In Compliance. The bag leak detection system (BLDS) computerized readout and historical
records were reviewed during this inspection, including alarm events. No exceptions to
compliance were observed. Quarterly sensitivity adjustments have not been necessary.

BLDS signals from the three baghouse buildings are compared to each other. If one signal
spikes and the other two remain consistent then an alarm triggered. Alarm setpoints are
well below the point where visible emissions would be observable so corrective action can be
initiated before a compliance issue arises. Maintenance activities are recorded.

II.B.3.b Condition:

The permittee shall comply with all applicable requirements specified in 40 CFR 60 Subpart AAa,
paragraphs 60.274a (a) through (h) including the installation, calibration and maintenance of a
system to verify that emission control systems are operating within established parameters.
[Origin: DAQE-AN100080048-21]. [40 CFR 60.274a]
31

II.B.3.b.1 Monitoring:

The permittee shall demonstrate compliance by performing all applicable monitoring and
inspections specified in 40 CFR 60.274a paragraphs (a) through (h).

II.B.3.b.2 Recordkeeping:

Permittee shall maintain records required by 40 CFR 60.274a(a) and 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. Fan operations are checked once per shift and damper operations are
continuously monitored in real time. The EAF automatically shuts down if fans and
dampers are detected to be out of range. Daily records show fan amp readings. Hard copy
of records are also kept.

II.B.3.c Condition:

Emissions of CO shall not exceed 1,200 lbs/hr based on a 1-hour average. [Origin: DAQE-
AN100080048-21]. [R307-401-8]

II.B.3.c.1 Monitoring:

The permittee shall install, calibrate, maintain, and operate a continuous emissions monitoring
(CEM) system on the EAF baghouse exhaust stack. The permittee shall record the output of the
system for measuring the CO emissions. The monitoring system shall comply with all applicable
sections of R307-170 and 40 CFR 60, Appendix B. Except for system breakdown, repairs,
calibration checks, and zero and span adjustments required under paragraph (d) 40 CFR 60.13, the
permittee shall continuously operate all required continuous monitoring systems and shall meet
minimum frequency of operation requirements as outlined in 40 CFR 60.13 and Section
R307-170. The permittee shall conduct a Relative Accuracy Test Audit (RATA) by the end of the
3rd calendar quarter of each year.

II.B.3.c.2 Recordkeeping:

Results of monitoring shall be recorded and maintained as required in R307-170 and as described
in Provision I.S.1 of this permit.

II.B.3.c.3 Reporting:

The permittee shall comply with the reporting provisions in R307-170-9 and any additional
reporting provisions contained in Section I of this permit. The quarterly reports required in
R307-170-9 are considered prompt notification of permit deviations required in Provision I.S.2.c
of this permit if all information required by Provision I.S.2.c is included in the report.

Status: Not Evaluated. A CEM system has been installed and operated. If the permitted limit is
reached, the EAF automatically shuts down. The CEM requirements are overseen by
DAQ’s CEM specialist. The company is required to submit quarterly state electronic data
reports and perform a periodic relative accuracy test audit.
32

II.B.3.d Condition:

Emissions of CO shall not exceed 682.93 lbs/hr based on an 8-hour average. [Origin: DAQE-
AN100080048-21]. [R307-401-8]

II.B.3.d.1 Monitoring:

The permittee shall install, calibrate, maintain, and operate a CEM system on the EAF baghouse
exhaust stack. The permittee shall record the output of the system for measuring the CO
emissions. The monitoring system shall comply with all applicable sections of R307-170 and 40
CFR 60, Appendix B. Except for system breakdown, repairs, calibration checks, and zero and
span adjustments required under paragraph (d) 40 CFR 60.13, the permittee shall continuously
operate all required continuous monitoring systems and shall meet minimum frequency of
operation requirements as outlined in 40 CFR 60.13 and Section R307-170. The permittee shall
conduct a Relative Accuracy Test Audit (RATA) by the end of the 3rd calendar quarter of each
year.

II.B.3.d.2 Recordkeeping:

Results of monitoring shall be recorded and maintained as required in R307-170 and as described
in Provision I.S.1 of this permit.

II.B.3.d.3 Reporting:

The permittee shall comply with the reporting provisions in R307-170-9 and any additional
reporting provisions contained in Section I of this permit. The quarterly reports required in
R307-170-9 are considered prompt notification of permit deviations required in Provision I.S.2.c
of this permit if all information required by Provision I.S.2.c is included in the report.

Status: Not Evaluated. A CEM system has been installed and operated. If the permitted limit is
reached, the EAF automatically shuts down. The CEM requirements are overseen by
DAQ’s CEM specialist. The company is required to submit quarterly state electronic data
reports and perform a periodic relative accuracy test audit.

II.B.3.e Condition:

Emissions of CO shall not exceed 2,800 tons per year based on a rolling 12-month total. [Origin:
DAQE-AN100080048-21]. [R307-401-8]

II.B.3.e.1 Monitoring:

The permittee shall install, calibrate, maintain, and operate a CEM system on the EAF baghouse
exhaust stack. The permittee shall record the output of the system for measuring the CO
emissions. The monitoring system shall comply with all applicable sections of R307-170 and 40
CFR 60, Appendix B. The emissions shall be determined on a rolling 12-month total. Within the
first 20 days of each month, the total shall be calculated for each calendar month and added to the
previous 11 months data.

Except for system breakdown, repairs, calibration checks, and zero and span adjustments required
under paragraph (d) 40 CFR 60.13, the permittee shall continuously operate all required
continuous monitoring systems and shall meet minimum frequency of operation requirements as
outlined in 40 CFR 60.13 and Section R307-170. The permittee shall conduct a Relative
Accuracy Test Audit (RATA) by the end of the 3rd calendar quarter of each year.
33

II.B.3.e.2 Recordkeeping:

Results of monitoring shall be recorded and maintained as required in R307-170 and as described
in Provision I.S.1 of this permit.

II.B.3.e.3 Reporting:

The permittee shall comply with the reporting provisions in R307-170-9 and any additional
reporting provisions contained in Section I of this permit. The quarterly reports required in
R307-170-9 are considered prompt notification of permit deviations required in Provision I.S.2.c
of this permit if all information required by Provision I.S.2.c is included in the report.

Status: Not Evaluated. A CEM system has been installed and operated. If the permitted limit is
reached, the EAF automatically shuts down. The CEM requirements are overseen by
DAQ’s CEM specialist. The company is required to submit quarterly state electronic data
reports and perform a periodic relative accuracy test audit.

II.B.3.f Condition:

Emissions of NOx shall not exceed 245 tons per year based on a rolling 12-month total. [Origin:
DAQE-AN100080048-21]. [R307-401-8]

II.B.3.f.1 Monitoring:

The permittee shall install, calibrate, maintain, and operate a CEM system on the EAF baghouse
exhaust stack. The permittee shall record the output of the system for measuring the NOx
emissions. The monitoring system shall comply with all applicable sections of R307-170 and 40
CFR 60, Appendix B. The emissions shall be determined on a rolling 12-month total. Within the
first 20 days of each month, the total shall be calculated for each calendar month and added to the
previous 11 months data.

Except for system breakdown, repairs, calibration checks, and zero and span adjustments required
under paragraph (d) 40 CFR 60.13, the permittee shall continuously operate all required
continuous monitoring systems and shall meet minimum frequency of operation requirements as
outlined in 40 CFR 60.13 and Section R307-170. The permittee shall conduct a Relative
Accuracy Test Audit (RATA) by the end of the 3rd calendar quarter of each year.

II.B.3.f.2 Recordkeeping:

Results of monitoring shall be recorded and maintained as required in R307-170 and as described
in Provision I.S.1 of this permit.

II.B.3.f.3 Reporting:

The permittee shall comply with the reporting provisions in R307-170-9 and any additional
reporting provisions contained in Section I of this permit. The quarterly reports required in
R307-170-9 are considered prompt notification of permit deviations required in Provision I.S.2.c
of this permit if all information required by Provision I.S.2.c is included in the report.

Status: Not Evaluated. A CEM system has been installed and operated. If the permitted limit is
reached, the EAF automatically shuts down. The CEM requirements are overseen by
DAQ’s CEM specialist. The company is required to submit quarterly state electronic data
reports and perform a periodic relative accuracy test audit.
34

II.B.3.g Condition:

Emissions of filterable TSP shall not exceed 27.0 lbs/hr and 0.0030 grains/dscf (68 degrees F, and
29.92 in Hg). [Origin: DAQE-AN100080048-21]. [40 CFR 60.272a(a)(1), R307-401-8]

II.B.3.g.1 Monitoring:

Stack testing shall be performed as specified below:

a) Frequency: Emissions shall be tested every year. Tests may also be required at the
direction of the Director.

b) Notification: At least 30 days before the test, the source shall notify the Director of
the date, time and place of testing, and provide a copy of the test protocol. The source
test protocol shall be approved by the Director prior to performing the tests. The
source shall attend a pretest conference if determined necessary by the Director.

c) Methods:

(i) Sample Location - the emission point shall conform to the requirements of 40
CFR 60, Appendix A, Method 1, or other EPA-approved testing method, as
acceptable to the Director. An Occupational Safety and Health Administration
(OSHA) or Mine Safety and Health Administration (MSHA) approved access
shall be provided to the test location.

(ii) Sample Method - 40 CFR 60. Appendix A, Method 5D, or other EPA approved
testing methods, as acceptable to the Director. The minimum sample time and
sample volume shall be 4 hours and 160 dscfm.

(iii) Volumetric Flow Rate - 40 CFR 60, Appendix A, Method 2 or other EPA
approved testing methods, as acceptable to the Director.

d) Calculations: To determine mass emission rates (lb/hr, etc.) the pollutant
concentration as determined by the appropriate methods above shall be multiplied by
the volumetric flow rate and any necessary conversion factors determined by the
Director to give the results in the specified units of the emission limitation.

e) Production Rate During Testing: The production rate during all compliance testing
shall be no less than 90% of the maximum production achieved in the previous three
(3) years.

II.B.3.g.2 Recordkeeping:

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

II.B.3.g.3 Reporting:

In addition to the reporting requirements of Section I of this permit, the permittee shall submit the
results of the stack tests to the Director within 60 days of completion of the testing. Results shall
clearly identify test results as compared to permit limits and indicate compliance status.

Status: In Compliance. Stack testing was last conducted August 3-4, 2023. Test results were
submitted to DAQ and audited in DAQC-1236-23. DAQ calculated test results for TSP were
1.6 lbs/hr and 0.0002 gr/dscf.

35

II.B.3.h Condition:

Emissions of filterable PM10 shall not exceed 17.8 lbs/hr and 0.0018 grains/dscf (68 degrees F, and
29.92 in Hg). [Origin: DAQE-AN100080048-21]. [R307-401-8]

II.B.3.h.1 Monitoring:

Stack testing shall be performed as specified below:

a) Frequency: Emissions shall be tested every year. Tests may also be required at the
direction of the Director.

b) Notification: At least 30 days before the test, the source shall notify the Director of
the date, time and place of testing, and provide a copy of the test protocol. The source
test protocol shall be approved by the Director prior to performing the tests. The
source shall attend a pretest conference if determined necessary by the Director.

c) Methods:

(i) Sample Location - the emission point shall conform to the requirements of 40
CFR 60, Appendix A, Method 1, or other EPA-approved testing methods, as
acceptable to the Director. An Occupational Safety and Health Administration
(OSHA) or Mine Safety and Health Administration (MSHA) approved access
shall be provided to the test location.

(ii) To measure filterable particulate emission, 40 CFR 51, Appendix M, Method 201
or Method 201A, or other EPA-approved testing method, as acceptable to the
Director. If other approved testing methods are used which cannot measure the
PM10 fraction of the filterable particulate emissions, all of the filterable
particulate emissions shall be considered PM10.

(iii) The back half condensables shall not be used for compliance demonstration but
shall be used for inventory purposes.

(iv) Volumetric Flow Rate - 40 CFR 60, Appendix A, Method 2 or other EPA-
approved testing method, as acceptable to the Director.

(v) Alternatively, 40 CFR 60, Appendix A, Method 5D may be used to determine
total TSP emissions. If TSP emissions are below the PM10 limit that will
constitute compliance with the PM10 limit. If TSP emissions are not below the
PM10 limit, the permittee shall retest using the methods allowed in paragraphs (i)-
(iv) above within 120 days of the TSP test date.

d) Calculations: To determine mass emission rates (lb/hr, etc.) the pollutant
concentration as determined by the appropriate methods above shall be multiplied by
the volumetric flow rate and any necessary conversion factors determined by the
Director to give the results in the specified units of the emission limitation.

e) Production Rate During Testing: The production rate during all compliance testing
shall be no less than 90% of the maximum production achieved in the previous three
(3) years.
36

II.B.3.h.2 Recordkeeping:

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

II.B.3.h.3 Reporting:

In addition to the reporting requirements of Section I of this permit, the permittee shall submit the
results of the stack tests to the Director within 60 days of completion of the testing. Results shall
clearly identify test results as compared to permit limits and indicate compliance status.

Status: In Compliance. Stack testing was last conducted August 3-4, 2023. Test results were
submitted to DAQ and audited in DAQC-1236-23. DAQ calculated test results for PM10
were 1.6 lbs/hr and 0.0002 gr/dscf.

II.B.3.i Condition:

Emissions of SO2 shall not exceed 93.98 lbs/hr based on a 3-hour rolling average. [Origin:
DAQE-AN100080048-21, SIP Section IX.H.12.k]. [R307-110-17, R307-401-8]

II.B.3.i.1 Monitoring:

The permittee shall install, calibrate, maintain, and operate a CEM system on the EAF baghouse
exhaust stack. The permittee shall record the output of the system for measuring the SO2 emissions
and stack gas volumetric flow rate. The monitoring system shall comply with all applicable
sections of R307-170 and 40 CFR 60, Appendix B. Except for system breakdown, repairs,
calibration checks, and zero and span adjustments required under paragraph (d) 40 CFR 60.13, the
permittee shall continuously operate all required continuous monitoring systems and shall meet
minimum frequency of operation requirements as outlined in 40 CFR 60.13 and Section
R307-170. The permittee shall conduct a Relative Accuracy Test Audit (RATA) by the end of the
3rd calendar quarter of each year.

II.B.3.i.2 Recordkeeping:

Results of monitoring shall be recorded and maintained as required in R307-170 and as described
in Provision I.S.1 of this permit.

II.B.3.i.3 Reporting:

The permittee shall comply with the reporting provisions in R307-170-9 and any additional
reporting provisions contained in Section I of this permit. The quarterly reports required in
R307-170-9 are considered prompt notification of permit deviations required in Provision I.S.2.c
of this permit if all information required by Provision I.S.2.c is included in the report.

Status: Not Evaluated. A CEM system has been installed and operated. If the permitted limit is
reached, the EAF automatically shuts down. The CEM requirements are overseen by
DAQ’s CEM specialist. The company is required to submit quarterly state electronic data
reports and perform a periodic relative accuracy test audit.

II.B.3.j Condition:

Emissions of SO2 shall not exceed 89.0 lbs/hr based on a 24-hour average. [Origin: DAQE-
AN100080048-21, SIP Section IX.H.12.k]. [R307-110-17, R307-401-8]
37

II.B.3.j.1 Monitoring:

The permittee shall install, calibrate, maintain, and operate a CEM system on the EAF baghouse
exhaust stack. The permittee shall record the output of the system for measuring the SO2 emissions
and stack gas volumetric flow rate. The monitoring system shall comply with all applicable
sections of R307-170 and 40 CFR 60, Appendix B. Except for system breakdown, repairs,
calibration checks, and zero and span adjustments required under paragraph (d) 40 CFR 60.13, the
permittee shall continuously operate all required continuous monitoring systems and shall meet
minimum frequency of operation requirements as outlined in 40 CFR 60.13 and Section
R307-170. The permittee shall conduct a Relative Accuracy Test Audit (RATA) by the end of the
3rd calendar quarter of each year.

II.B.3.j.2 Recordkeeping:

Results of monitoring shall be recorded and maintained as required in R307-170 and as described
in Provision I.S.1 of this permit.

II.B.3.j.3 Reporting:

The permittee shall comply with the reporting provisions in R307-170-9 and any additional
reporting provisions contained in Section I of this permit. The quarterly reports required in
R307-170-9 are considered prompt notification of permit deviations required in Provision I.S.2.c
of this permit if all information required by Provision I.S.2.c is included in the report.

Status: Not Evaluated. A CEM system has been installed and operated. If the permitted limit is
reached, the EAF automatically shuts down. The CEM requirements are overseen by
DAQ’s CEM specialist. The company is required to submit quarterly state electronic data
reports and perform a periodic relative accuracy test audit.

II.B.3.k Condition:

Emissions of SO2 shall not exceed 245 tons per year based on a rolling 12-month total. [Origin:
DAQE-AN100080048-21]. [R307-401-8]

II.B.3.k.1 Monitoring:

The permittee shall install, calibrate, maintain, and operate a CEM system on the EAF baghouse
exhaust stack. The permittee shall record the output of the system for measuring the SO2
emissions. The monitoring system shall comply with all applicable sections of R307-170 and 40
CFR 60, Appendix B. The emissions shall be determined on a rolling 12-month total. Within the
first 20 days of each month, the total shall be calculated for each calendar month and added to the
previous 11 months data.

Except for system breakdown, repairs, calibration checks, and zero and span adjustments required
under paragraph (d) 40 CFR 60.13, the permittee shall continuously operate all required
continuous monitoring systems and shall meet minimum frequency of operation requirements as
outlined in 40 CFR 60.13 and Section R307-170. The permittee shall conduct a Relative
Accuracy Test Audit (RATA) by the end of the 3rd calendar quarter of each year.

II.B.3.k.2 Recordkeeping:

38

Results of monitoring shall be recorded and maintained as required in R307-170 and as described
in Provision I.S.1 of this permit.
II.B.3.k.3
Reporting:

The permittee shall comply with the reporting provisions in R307-170-9 and any additional
reporting provisions contained in Section I of this permit. The quarterly reports required in
R307-170-9 are considered prompt notification of permit deviations required in Provision I.S.2.c
of this permit if all information required by Provision I.S.2.c is included in the report.

Status: Not Evaluated. A CEM system has been installed and operated. If the permitted limit is
reached, the EAF automatically shuts down. The CEM requirements are overseen by
DAQ’s CEM specialist. The company is required to submit quarterly state electronic data
reports and perform a periodic relative accuracy test audit.

II.B.3.l Condition:

Permittee shall prepare and implement a pollution prevention plan for metallic scrap selection and
inspection to minimize the amount of chlorinated plastics, lead, and free organic liquids that is
charged to the furnace. A copy of the plan must be kept onsite, the permittee must provide
training on the plan’s requirements to all plant personnel with materials acquisition or inspection
duties. The plan must include the information in 40 CFR 63.10685(a)(1)(i)-(iii).
[Origin: 40 CFR 63.10685(a)(1)]. [40 CFR 63 Subpart YYYYY]

II.B.3.l.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.3.l.2 Recordkeeping:

Records shall demonstrate compliance with the requirements for the pollution prevention plan in
accordance with 40 CFR 63.10685(c). Records shall be maintained in accordance with Provision
I.S.1 of this permit.

II.B.3.l.3 Reporting:

The semi-annual compliance report shall certify compliance with the pollution prevention plan in
accordance with 40 CFR 63.10685(c). There are no other reporting requirements for this
provision except those specified in Section I of this permit.

Status: In Compliance. Nucor has implemented a pollution prevention plan (PPP) and has
submitted the required semi-annual compliance reports verifying compliance with the
mercury switch removal requirements. The most recent Semi-annual compliance report was
received by DAQ on January 18, 2024.

II.B.3.m Condition:

Permittee shall certify in your notice of compliance status that you participate in and purchase
motor vehicle scrap only from scrap providers who participate in a program for removal of
mercury switches that has been approved by the EPA. [Origin: 40 CFR 63.10685(b)(2) and 40
CFR 63.10685(b)(2)(iv)]. [40 CFR 63 Subpart YYYYY]
39

II.B.3.m.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.3.m.2 Recordkeeping:

Records shall demonstrate compliance with the requirements of this condition in accordance with
40 CFR 63.10685(c). Records shall be maintained in accordance with Provision I.S.1 of this
permit.

II.B.3.m.3 Reporting:

The semi-annual compliance report shall certify compliance with this provision in accordance with
40 CFR 63.10685(c). There are no other reporting requirements for this provision except those
specified in Section I of this permit.

Status: In Compliance. Nucor has implemented a pollution prevention plan (PPP). Semi-annual
compliance reports have been submitted and certify compliance with the requirements of
Subpart YYYYY.

II.B.3.n Condition:

For scrap that does not contain motor vehicle scrap, permittee shall certify in your notification of
compliance status and maintain records of documentation that this scrap does not contain motor
vehicle scrap. [Origin: 40 CFR 63.10685(b)(4)]. [40 CFR 63 Subpart YYYYY]

II.B.3.n.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.3.n.2 Recordkeeping:

Permittee shall keep records documenting compliance with this section for scrap that does not
contain motor vehicle scrap in accordance with 40 CFR 63.10685(c). Records shall be maintained
in accordance with Provision I.S.1 of this permit.

II.B.3.n.3 Reporting:

The semi-annual compliance report shall certify compliance with this provision in accordance with
40 CFR 63.10685(c). There are no other reporting requirements for this provision except those
specified in Section I of this permit.

Status: In Compliance. Records are kept to demonstrate that scrap received meets the requirements
of Subpart YYYYY. Semi-annual compliance reports have been submitted and certify
compliance with the requirements of Subpart YYYYY.

II.B.3.o Condition:

Emissions of filterable PM2.5 shall not exceed 17.4 lbs/hr and 0.00176 grains/dscf based on a 24-
hour average (68 degrees F, and 29.92 in Hg). Emissions of condensable PM2.5 shall not exceed
29.53 lbs/hr based on a 24-hour average. [Origin: DAQE-AN100080048-21, SIP Section
IX.H.12.k]. [R307-110-17, R307-401-8]
40

II.B.3.o.1 Monitoring:

1) Stack testing shall be performed as specified below:

(a) Frequency: Emissions shall be tested every year. Tests may also be required at
the direction of the Director.

(b) Notification: At least 30 days before the test, the source shall notify the Director
of the date, time, and place of testing, provide a copy of the test protocol. The
source test protocol shall be approved by the Director prior to performing the
tests. The source shall attend a pretest conference if determined necessary by the
Director.

(c) Methods:

(i) Sample Location - the emission point shall conform to the requirements of 40
CFR 60, Appendix A, Method 1, or other EPA approved testing method as
acceptable to the Director. An Occupational Safety and Health
Administration (OSHA) or Mine Safety and Health Administration (MSHA)
approved access shall be provided to the test location.

(ii) To measure filterable particulate emissions, 40 CFR 51, Appendix M,
Method 201A or other EPA approved testing method, as acceptable to the
Director. If other approved testing methods are used which cannot measure
the PM2.5 fraction of the filterable particulate emissions, all of the filterable
particulate emissions shall be considered PM2.5.

(iii) To measure condensable particulate emissions, 40 CFR51, Appendix M,
Method 202 or other EPA approved testing method, as acceptable to the
Director.

(iv) Both the filterable particulate emissions and the condensable particulate
emissions shall be used for compliance demonstration.

(v) Volumetric Flow Rate - 40 CFR 60, Appendix A, Method 2 or other EPA-
approved testing methods, as acceptable to the Director.

(vi) Alternatively, 40 CFR 60, Appendix A, Method 5D may be used to
determine total TSP emissions. If TSP emissions are below the PM2.5 limit
that will constitute compliance with the PM10 limit. If TSP emissions are not
below the PM2.5 limit, the permittee shall retest using the methods allowed in
paragraphs (i)-(v) above within 120 days of the TSP test date.

(d) Calculations: To determine mass emission rates (lb/hr, etc.) the pollutant
concentration as determined by the appropriate methods above shall be multiplied
by the volumetric flow rate and any necessary conversion factors determined by
the Director to give the results in the specified units of the emission limitation.

(e) Production Rate During Testing: The production rate during all compliance
testing shall be no less than 90% of the maximum production achieved in the
previous three (3) years.
41

II.B.3.o.2 Recordkeeping:

Results of all stack testing shall be recorded and maintained in accordance with the associated test
method and Provision I.S.1 of this permit.

II.B.3.o.3 Reporting:

In addition to the reporting requirements of Section I of this permit, the permittee shall submit the
results of the stack tests to the Director within 60 days of completion of the testing. Results shall
clearly identify test results as compared to permit limits and indicate compliance status.

Status: In Compliance. Stack testing was last conducted August 3-4, 2023. Test results were
submitted to DAQ and audited in DAQC-1236-23. DAQ calculated test results for PM2.5
were 1.6 lbs/hr and 0.0002 gr/dscf.

II.B.3.p Condition:

STATE ONLY REQUIREMENT. Emissions of NOx shall not exceed 59.5 lbs/hr based on a
calendar day average. [Origin: SIP Section IX.H.12.k]. [R307-110-17]

II.B.3.p.1 Monitoring:

The permittee shall install, calibrate, maintain, and operate a continuous emissions monitoring
system on the EAF baghouse exhaust stack. The permittee shall record the output of the system
for measuring the NOx emissions and stack gas volumetric flow rate. The monitoring system shall
comply with all applicable sections or R307-170 and 40 CFR 60, Appendix B. The emissions
shall be determined on a calendar day average every day.

Except for system breakdown, repairs, calibration checks, and zero and span adjustments required
under paragraph (d) 40 CFR 60.13, the permittee shall continuously operate all required
continuous monitoring systems and shall meet minimum frequency of operation requirements as
outlined in 40 CFR 60.13 and Section R307-170. The permittee shall conduct a Relative
Accuracy Test Audit (RATA) by the end of the 3rd calendar quarter of each year.

II.B.3.p.2 Recordkeeping:

Results of monitoring shall be recorded and maintained as required in R307-170 and as described
in Provision I.S.1 of this permit.

II.B.3.p.3 Reporting:

The permittee shall comply with the reporting provisions in R307-170-9 and any additional
reporting provisions contained in Section I of this permit. The quarterly reports required in
R307-170-9 are considered prompt notification of permit deviations required in Provision I.S.2.c
of this permit if all information required by Provision I.S.2.c is included in the report.

Status: Not Evaluated. A CEM system has been installed and operated. If the permitted limit is
reached, the EAF automatically shuts down. The CEM requirements are overseen by
DAQ’s CEM specialist. The company is required to submit quarterly state electronic data
reports and perform a periodic relative accuracy test audit

42

II.B.3.q Condition:

Emissions of VOC shall not exceed 22.20 lbs/hr. [Origin: DAQE-AN100080048-21, SIP Section
IX.H.12.k]. [R307-110-17, R307-401-8]

II.B.3.q.1 Monitoring:

Stack testing shall be performed as follows:

(a) Frequency: Emissions shall be tested every year. The source may also be tested at any
time if directed by the Director.

(b) Notification: At least 30 days before the test, the source shall notify the Director of
the date, time and place of testing, and provide a copy of the test protocol. The source
test protocol shall be approved by the Director prior to performing the tests. The
source shall attend a pretest conference if determined necessary by the Director.

(c) The emission sample point shall conform to the requirements of 40 CFR 60, Appendix
A, Method 1, or other EPA-approved testing method, as acceptable to the Director.
Occupational Safety and Health Administration (OSHA) or Mine Safety and Health
Administration (MSHA) approved access shall be provided to the test location.

(d) VOC emissions shall be determined by using 40 CFR 60, Appendix A, Method 25A
using a flame ionization analyzer equipped with a methane separator. If such an
analyzer is unavailable, VOC emissions shall be determined simultaneously using two
(2) analyzers, with one (1) configured to read only methane. The difference between
the total organic detector and the methane detector shall constitute the VOC
measurement.

or

VOC shall be determined through a combination of 40 CFR 60, App. A, Method 25A
and Method 18. The Method 25A flame ionization analyzer, calibrated as propane,
shall measure total hydrocarbons. The permittee shall use Tedlar bags to collect and
analyze methane in accordance with 40 CFR 60, App. A-6, Method 18. Methane shall
be subtracted from the total hydrocarbons to determine the total non-methane VOC
emissions.

(e) Volumetric Flow Rate - 40 CFR 60, Appendix A, Method 2 or other EPA-approved
testing method, as acceptable to the Director.

(f) Calculations: To determine mass emission rates (lb/hr, etc.) the pollutant
concentration as determined by the appropriate methods above shall be multiplied by
the volumetric flow rate and any necessary conversion factors determined by the
Director to give the results in the specified units of the emission limitation.

(g) Production Rate During Testing: The production rate during all compliance testing
shall be no less than 90% of the maximum production achieved in the previous three
(3) years.

II.B.3.q.2 Recordkeeping:
43

Results of all stack testing shall be recorded and maintained in accordance with the associated test
method and Provision I.S.1 of this permit.

II.B.3.q.3 Reporting:

In addition to the reporting requirements of Section I of this permit, the permittee shall submit the
results of the stack tests to the Director within 60 days of completion of the testing. Results shall
clearly identify test results as compared to permit limits and indicate compliance status.

Status: In Compliance. Stack testing was last conducted August 3-4, 2023. Test results were
submitted to DAQ and audited in DAQC-1236-23. DAQ calculated test results for VOC
were 13.8 lbs/hr.

II.B.4 Conditions on EAF Dust Handling Equipment.

II.B.4.a Condition:

Visible emissions shall be less than 10% opacity. [Origin: 40 CFR 60 Subpart AAa].
[40 CFR 60.272a(b)]

II.B.4.a.1 Monitoring:

Opacity observations of dust-handling activities shall be conducted at least once every six months.
An opacity observation shall be performed in accordance with 40 CFR 60, Appendix A, Method 9
on the emission unit that appears to have the highest opacity. If this unit does not exceed the
opacity limitation, no further observations of any of the emission units will be required. If this
unit exceeds the opacity limitation, the emission unit with the next highest opacity shall be
observed until an emission unit does not exceed the opacity limitation. All emission units not
observed shall be considered to not exceed the opacity limitation.

II.B.4.a.2 Recordkeeping:

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

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. No visible emissions or fugitive dust were observed during this inspection.
Semi-annual opacity observations have been performed and recorded.

II.B.5 Conditions on Billet Reheat Furnace #1.

II.B.5.a Condition:

Visible emissions shall not exceed 10% opacity. [Origin: DAQE-AN100080048-21].
[R307-401-8]

II.B.5.a.1 Monitoring:

44

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

II.B.5.a.2 Recordkeeping:

Results of monitoring 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. Only natural gas is used in the billet reheat furnace.

II.B.5.b Condition:

Emissions of NOx shall not exceed 15.0 lbs/hr. [Origin: DAQE-AN100080048-21, SIP Section
IX.H.12.k]. [R307-110-17, R307-401-8]

II.B.5.b.1 Monitoring:

Stack testing shall be performed as specified here:

(a) Frequency: Emissions shall be tested every year. Tests may also be required at the
direction of the Director.

(b) Notification: At least 30 days before the test, the source shall notify the Director of
the date, time and place of testing, and provide a copy of the test protocol. The source
test protocol shall be approved by the Director prior to performing the tests. The
source shall attend a pretest conference if determined necessary by the Director.

(c) The emission sample point shall conform to the requirements of 40 CFR 60, Appendix
A, Method 1, or other EPA-approved testing methods acceptable to the Director. In
addition, Occupational Safety and Health Administration (OSHA) or Mine Safety and
Health Administration (MSHA) approved access shall be provided to the test location.

(d) Methods to be used:

(1) To determine stack volumetric flow rate - 40 CFR 60, Method 2, or other EPA-
approved testing method, as acceptable to the Director.

(2) To test for NOx emissions - 40 CFR 60, Appendix A, Method 7, 7A, 7B, 7C, 7D,
or 7E, or other EPA-approved testing method, as acceptable to the Director.

(e) Calculations: To determine mass emission rates (lb/hr, etc.) the pollutant
concentration as determined by the appropriate methods above shall be multiplied by
the volumetric flow rate and any necessary conversion factors to give the results in the
specified units of the emission limitation.

45

(f) Production Rate During Testing: The production rate during all compliance testing
shall be no less than 90% of the maximum production achieved in the previous three
(3) years.

II.B.5.b.2 Recordkeeping:

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

II.B.5.b.3 Reporting:

In addition to the reporting requirements of Section I of this permit, the permittee shall submit the
results of the stack tests to the Director within 60 days of completion of the testing. Results shall
clearly identify test results as compared to permit limits and indicate compliance status.

Status: In Compliance. Stack testing was last conducted August 1, 2023. Test results were
submitted to DAQ and audited in DAQC-1236-23. DAQ calculated test results for NOX were
8.7 lbs/hr.

II.B.6 Conditions on Billet Reheat Furnace #2.

II.B.6.a Condition:

Visible emissions shall not exceed 10% opacity. [Origin: DAQE-AN100080048-21].
[R307-401-8]

II.B.6.a.1 Monitoring:

In lieu of monitoring via visible emission observations, fuel usage other than natural gas or
propane shall be monitored.

II.B.6.a.2 Recordkeeping:

Results of monitoring shall be maintained in accordance with 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. Only natural gas is used in the billet reheat furnace.

II.B.6.b Condition:

Emissions of NOx shall not exceed 8.0 lbs/hr. [Origin: DAQE-AN100080048-21, SIP Section
IX.H.12.k]. [R307-110-17, R307-401-8]

II.B.6.b.1 Monitoring:

Stack testing shall be performed as specified here:

46

(a) Frequency: Emissions shall be tested every year. Tests may also be required at the
direction of the Director.

(b) Notification: At least 30 days before the test, the source shall notify the Director of
the date, time and place of testing, and provide a copy of the test protocol. The source
test protocol shall be approved by the Director prior to performing the tests. The
source shall attend a pretest conference if determined necessary by the Director.

(c) The emission sample point shall conform to the requirements of 40 CFR 60, Appendix
A, Method 1, or other EPA-approved testing methods acceptable to the Director. In
addition, Occupational Safety and Health Administration (OSHA) or Mine Safety and
Health Administration (MSHA) approved access shall be provided to the test location.

(d) Methods to be used:

(1) To determine stack volumetric flow rate - 40 CFR 60, Appendix A, Method 2, or
other EPA-approved testing method, as acceptable to the Director.

(2) To test for NOx emissions - 40 CFR 60, Appendix A, Method 7, 7A, 7B, 7C, 7D,
or 7E, or other EPA-approved testing method, as acceptable to the Director.

(e) Calculations: To determine mass emission rates (lb/hr, etc.) the pollutant
concentration as determined by the appropriate methods above shall be multiplied by
the volumetric flow rate and any necessary conversion factors to give the results in the
specified units of the emission limitation.

(f) Production Rate During Testing: The production rate during all compliance testing
shall be no less than 90% of the maximum production achieved in the previous three
(3) years.

II.B.6.b.2 Recordkeeping:

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

II.B.6.b.3 Reporting:

In addition to the reporting requirements of Section I of this permit, the permittee shall submit the
results of the stack tests to the Director within 60 days of completion of the testing. Results shall
clearly identify test results as compared to permit limits and indicate compliance status.

Status: In Compliance. Stack testing was last conducted August 1, 2023. Test results were
submitted to DAQ and audited in DAQC-1236-23. DAQ calculated test results for NOX were
4.2 lbs/hr.

II.B.7 Conditions on Fugitives from Unpaved Haul Roads and Service Roads.

II.B.7.a Condition:

The permittee shall not allow visible emissions from haul roads or service roads to exceed 20% on
site and 10% at the property boundary. [Origin: DAQE-AN100080048-21]. [R307-401-8]

47

II.B.7.a.1 Monitoring:

In lieu of opacity monitoring, unpaved roads and other unpaved operational areas that are used by
mobile equipment shall be water sprayed and/or chemically treated in sufficient frequency and
quantity to maintain the surface material in a damp/moist condition except when freezing
conditions exist.

II.B.7.a.2 Recordkeeping:

Records of chemical and water treatment shall be kept in a log for all periods when the plant is in
operation. Records shall include the following items:

(a) Date and time

(b) Number and type of treatments made

(c) Dilution ratio, if applicable

Records shall be made available to the Director upon request and kept 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: In Compliance. There were no visible emissions observed from the unpaved roadways, and
the water truck was operating at the time of this inspection. Nucor uses water and MgCl2 on
unpaved roadways. Water and MgCl2 records have been maintained.

II.B.8 Conditions on Fugitives from Paved Haul Roads and Service Roads.

II.B.8.a Condition:

Visible emissions shall not exceed 10% opacity. [Origin: DAQE-AN100080048-21].
[R307-401-8]

II.B.8.a.1 Monitoring:

In lieu of opacity monitoring, the permittee shall sweep or water-flush-clean paved haul roads and
other paved operational areas as needed to maintain the opacity requirement listed above.

II.B.8.a.2 Recordkeeping:

Records of sweeping and water-flush-cleaning shall be kept in a log for all periods when the plant
is in operation. Records shall include the following items:

(a) Date and time

(b) Number and type of treatments made

48

(c) Dilution ratio, if applicable

Records shall be made available to the Director upon request and kept as described in Provision
I.S.1 of this permit.

II.B.8.a.3 Reporting:

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

Status: In Compliance. No visible emissions were observed coming from paved roadways during
this inspection. Sweeping and road watering is conducted on an as-needed basis. Water and
sweeping records are maintained.

II.B.9 Conditions on Fuel Storage Tanks.

II.B.9.a Condition:

The Gasoline Storage Tank monthly throughput shall be less than 10,000 gallons of gasoline. The
permittee must not allow gasoline to be handled in 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:

1. Minimize gasoline spills

2. Clean up spills as expeditiously as practicable

3. Cover all open gasoline containers and all gasoline storage tank fill-pipes with a gasketed seal
when not in use

4. 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 to the Director 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.9.a.1 Monitoring:

Records required for this permit condition will serve as monitoring.

49

II.B.9.a.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 any affected emission unit including:

(1) Records of the occurrence and duration of each malfunction of operation (i.e., process
equipment) or the air pollution control and monitoring equipment; and

(2) Records 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(a), 40 CFR 63.11125(d)]

Records shall be kept that demonstrate compliance with this provision and 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. Tank throughput records were reviewed at time of the inspection and were
normally 3,000-4,000 gallons per month. No monthly throughput exceeding 10,000 gallons
was noted. Spills are cleaned expeditiously.

II.B.10 Conditions on Selected 10% Opacity Emission Units.

II.B.10.a Condition:

Visible emissions shall not exceed 10% opacity from each affected emission unit. [Origin:
DAQE-AN100080048-21]. [R307-401-8]

II.B.10.a.1 Monitoring:

Opacity observations of affected emission units shall be conducted at least once every six months.
An opacity observation shall be performed in accordance with 40 CFR 60, Appendix A, Method 9
on the emission unit that appears to have the highest opacity. If this unit does not exceed the
opacity limitation, no further observations of any of the emission units will be required. If this
unit exceeds the opacity limitation, the emission unit with the next highest opacity shall be
observed until an emission unit does not exceed the opacity limitation. All emission units not
observed shall be considered to not exceed the opacity limitation.

II.B.10.a.2 Recordkeeping:

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

II.B.10.a.3 Reporting:
50

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

Status: In Compliance. No visible emissions were observed during this inspection. Semi-annual
opacity observations have been performed and recorded.

II.B.11 Conditions on Sandblasting Station(s).

II.B.11.a Condition:

Visible emissions shall not exceed 40% opacity, except for an aggregate period of three minutes in
any one hour. [Origin: R307-206]. [R307-206]

II.B.11.a.1 Monitoring:

(a) Visible emissions shall be measured using EPA Method 9 every six months if abrasive
blasting operations are conducted. Visible emissions from intermittent sources shall
use procedures similar to Method 9, but the requirement for observations to be made
at 15 second intervals over a six-minute period shall not apply.

(b) Visible emissions from unconfined blasting shall be measured at the densest point of
the emission after a major portion of the spent abrasive has fallen out, at a point not
less than five feet nor more than twenty-five feet from the impact surface from any
single abrasive blasting nozzle.

(c) An unconfined blasting operation that uses multiple nozzles shall be considered a
single source unless it can be demonstrated by the permittee that each nozzle,
measured separately, meets the emission and performance standards provided in
R307-206-2 through 4.

(d) Visible emissions from confined blasting shall be measured at the densest point after
the air contaminant leaves the enclosure.

II.B.11.a.2 Recordkeeping:

Results of monitoring shall be maintained in accordance with 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: In Compliance. Sandblasting is conducted infrequently at the facility. All sandblasting has
been confined.

II.B.12 Conditions on VOCs from Evaporative Sources.

II.B.12.a Condition:

Plant wide emissions of VOC from miscellaneous solvent, cleaners (excluding janitorial),
painting, and rolling mill oil and grease use shall not exceed 42.64 tons per 12-month rolling
period. [Origin: DAQE-AN100080048-21]. [R307-401-8]
51

II.B.12.a.1 Monitoring:

Compliance with the limitation shall be determined on a rolling 12-month total. Based on the first
day of each month a new 12-month total shall be calculated using the previous 12 months data.
This documentation shall be completed by the 20th day of each month.

II.B.12.a.2 Recordkeeping:

A) Records shall include the following data for each item used:

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

(2) Quantity of VOC-containing materials used (gallons);

(3) Density of VOC-containing materials used (pounds per gallon);

(4) Percent by weight of all VOCs in each material;

(5) The total quantity of VOCs used each month shall be the sum of the VOC usage
calculated for each material by the following procedure:

VOC usage (lbs) = [% VOC by Weight/100] x [Density (lb/gal)] x [Quantity
Consumed (gal)]

VOC usage (tons) = VOC usage (lbs) / 2000

(6) The quantity of VOC reclaimed for the month shall be similarly quantified and
subtracted from the quantities calculated in step (5), to provide the monthly total
VOC emissions.

B) The rolling mill VOC calculation shall be determined by the weight of oil and grease
purchased for use in the rolling mill each month multiplied by 4.63%.

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. Plant-wide VOC emissions for the 12-month period ending March 31, 2024,
were 27.38 tons.

II.B.13 Conditions on Paint Dip Line.

II.B.13.a Condition:

1. The permittee shall not apply coatings with a VOC content greater than 2.3 pounds of VOC
per gallon of coating, minus water and exempt solvents, unless the owner or operator uses an
add-on control device as specified in R307-350-8.

52

2. 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.

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

[Origin: DAQE-AN100080048-21, R307-350]. [R307-350-2, R307-350-3, R307-350-5, R307-
350-6, R307-350-8]

II.B.13.a.1 Monitoring:

VOC content shall be determined by inspection of the VOC specifications provided by the vendor
in purchase records.

II.B.13.a.2 Recordkeeping:

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

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. MSDS are used to determine VOC content when ordering paint from
vendors.

II.B.13.b Condition:

Work practices of R307-350-7(1) and (2) shall be followed. [Origin: R307-350-7]. [R307-350]

II.B.13.b.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.13.b.2 Recordkeeping:

The permittee shall maintain records demonstrating compliance with R307-350-7 as specified in
R307-350-9.

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

II.B.13.b.3 Reporting:

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

Status: In Compliance. Monthly inspections are conducted and records are maintained. Compliant
materials are used.
53

II.B.14 Conditions on NSPS Emergency Compression Ignition Internal Combustion Engines (CI
ICE).

II.B.14.a Condition:

The permittee shall operate and maintain affected emission units that achieve the emission
standards as required in 40 CFR 60.4204 and 40 CFR 60.4205 over the entire life of the engine.
The permittee shall do all of the following, except as permitted in II.B.14.a.1(b):

(1) Operate and maintain the stationary CI ICE and control device according to the manufacturer's
emission-related written instructions;

(2) Change only those emission-related settings that are permitted by the manufacturer; and

(3) Meet the requirements of 40 CFR part 1068, as applicable.

[Origin: 40 CFR 60 Subpart IIII]. [40 CFR 60.4206, 40 CFR 60.4211(a),
40 CFR 63 Subpart ZZZZ]

II.B.14.a.1 Monitoring:

(a) The permittee shall document activities performed to assure proper operation and
maintenance.

(b) If the permittee does not install, configure, operate, and maintain affected emission
units and control devices according to the manufacturer's emission-related written
instructions, or changes emission-related settings in a way that is not permitted by the
manufacturer, the permittee shall demonstrate compliance as follows:

(1) For affected emission units with maximum engine power less than 100 HP:

a. Keep a maintenance plan and records of conducted maintenance to
demonstrate compliance; and

b. To the extent practicable, maintain and operate the engine in a manner
consistent with good air pollution control practice for minimizing emissions;
and

c. If the permittee does not install and configure the engine and control device
according to the manufacturer's emission-related written instructions, or
changes the emission-related settings in a way that is not permitted by the
manufacturer, the permittee shall conduct an initial performance test to
demonstrate compliance with the applicable emission standards within 1 year
of such action.

(2) For affected emission units greater than or equal to 100 HP and less than or equal
to 500 HP:

a. Keep a maintenance plan and records of conducted maintenance; and

54

b. To the extent practicable, maintain and operate the engine in a manner
consistent with good air pollution control practice for minimizing emissions;
and

c. Conduct an initial performance test to demonstrate compliance with the
applicable emission standards within 1 year of startup, or within 1 year after
an engine and control device is no longer installed, configured, operated, and
maintained in accordance with the manufacturer's emission-related written
instructions, or within 1 year after changing emission-related settings in a way
that is not permitted by the manufacturer.

II.B.14.a.2 Recordkeeping:

Results of monitoring shall be maintained in accordance with 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. The certified emergency diesel engines are maintained and operated
accordingly. Annual maintenance is conducted in-house and records kept.

II.B.14.b Condition:

For all affected emission units with a displacement of less than 30 liters per cylinder that use
diesel fuel, the permittee shall use diesel fuel that meets the requirements of 40 CFR 1090.305for
nonroad diesel fuel. [Origin: 40 CFR 60 Subpart IIII]. [40 CFR 60.4207(b),
40 CFR 63 Subpart ZZZZ]

II.B.14.b.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.14.b.2 Recordkeeping:

For all diesel fuel combusted, the permittee shall maintain fuel receipt records and documentation
demonstrating compliance with this provision. These 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. Fuel records were reviewed during this inspection and indicated
compliance.

II.B.14.c Condition:

The permittee shall operate each emergency stationary ICE according to the requirements in
55

paragraphs (1) through (3). In order for the engine to be considered an emergency stationary ICE
under 40 CFR 60 Subpart IIII, any operation other than as described in 40 CFR 60.4211(f), is
prohibited. If the engine is not operated according to the requirements in 40 CFR 60.4211(f), 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.

(2) Emergency stationary ICE may be operated for any combination of the purposes specified in
40 CFR 60.4211(f)(2) for a maximum of 100 hours per calendar year. Any operation for non-
emergency situations as allowed by 40 CFR 60.4211(f)(3) counts as part of the 100 hours per
calendar year allowed by this paragraph.

(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
non-emergency situations, as specified in 40 CFR 60.4211(f)(3).

[Origin: 40 CFR 40 CFR 60 Subpart IIII]. [40 CFR 60.4211(f), 40 CFR 63 Subpart ZZZZ]

II.B.14.c.1 Monitoring:

To determine duration of operation the permittee shall install a non-resettable hour meter for each
emergency engine. Records required for this permit condition will serve as monitoring. [DAQE-
AN100080048-21]

II.B.14.c.2 Recordkeeping:

Records of each affected emergency emission unit shall be kept on a monthly basis in an operation
and maintenance log. Records shall distinguish between maintenance-related hours and
emergency use-related hours. If additional hours are to be used for maintenance checks and
readiness testing, the permittee shall maintain records indicating that federal, state, or local
standards require maintenance and testing of emergency ICE beyond 100 hours per calendar year.
[40 CFR 60.4211(f)]

The permittee shall keep records of the operation of each engine in emergency and non-emergency
service that are recorded through the non-resettable hour meter. The permittee shall record the date
the engine was used, the time of operation of the engine, and the reason the engine was in
operation during that time. [DAQE-AN100080048-21]

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

II.B.14.c.3 Reporting:

56

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

Status: In Compliance. Non-resettable hour meters are installed. Hours of operation records were
reviewed at time of the inspection. The 100-hour limit on use for maintenance and readiness
testing was not exceeded.

II.B.14.d Condition:

For all affected emission units, except those that are modified, reconstructed, or removed from one
existing location and reinstalled at a new location, the permittee shall comply with paragraphs (1)
through (3).

(1) The permittee shall not install affected emission units (excluding fire pump engines) that do
not meet the applicable requirements for 2007 model year engines.

(2) The permittee shall not install affected emission units with a maximum engine power of less
than 19 KW (25 HP) (excluding fire pump engines) that do not meet the applicable
requirements for 2008 model year engines.

(3) The permittee shall not import affected emission units with a displacement of less than 30
liters per cylinder that do not meet the applicable requirements specified in paragraphs (1)
through (3) of this section after the dates specified in 40 CFR 60.4208.

[Origin: 40 CFR 60 Subpart IIII]. [40 CFR 60.4208, 40 CFR 63 Subpart ZZZZ]

II.B.14.d.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.14.d.2 Recordkeeping:

The permittee shall keep records of the install date of each affected emission unit and the
applicable requirements under 40 CFR 60 Subpart IIII for the respective model year engine.
Records shall be maintained as described in Provision I.S.1 of this permit.

II.B.14.d.3 Reporting:

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

Status: In Compliance. Only DAQ-approved engines have been installed.

II.B.14.e Condition:

For pre-2007 model year emergency affected emission units with a displacement of less than 10
liters per cylinder that are not fire pump engines, the permittee shall comply with the emission
standards in Table 1 of 40 CFR 60 Subpart IIII. For pre-2007 model year emergency affected
emission units with a displacement of greater than or equal to 10 liters per cylinder and less than
30 liters per cylinder that are not fire pump engines, the permittee shall comply with the Tier 1
emission standards in 40 CFR part 1042, Appendix I. For modified or reconstructed affected
57

emission units with a displacement of less than 10 liters per cylinder that are not fire pump
engines, the permittee shall meet the emission standards in Table 1 of 40 CFR 60 Subpart IIII
applicable to the model year, maximum engine power, and displacement of the modified or
reconstructed engine. For modified or reconstructed affected emission units with a displacement of
greater than or equal to 10 liters per cylinder and less than 30 liters per cylinder that are not fire
pump engines, the permittee shall meet the emission standards in 40 CFR part 1042, Appendix I
applicable to the model year, maximum engine power, and displacement of the modified or
reconstructed engine. If the permittee conducts performance tests in-use on stationary CI ICE with
a displacement of less than 30 liters per cylinder they shall meet the not-to-exceed (NTE)
standards as indicated in 40 CFR 60.4212. [Origin: 40 CFR 60 Subpart IIII]. [40 CFR 60.4205(a),
40 CFR 60.4205(e), 40 CFR 60.4205(f), 40 CFR 63 Subpart ZZZZ]

II.B.14.e.1 Monitoring:

(a) The permittee shall demonstrate compliance according to one of the methods specified
in
paragraphs (1) through (5) of this section.

(1) Purchasing an engine certified according to 40 CFR parts 1039 and 1042, as
applicable, for the same model year and maximum engine power. The engine
must be installed and configured according to the manufacturer's specifications.

(2) Keeping records of performance test results for each pollutant for a test conducted
on a
similar engine. The test must have been conducted using the same methods
specified in 40
CFR 60 Subpart IIII and these methods must have been followed correctly.

(3) Keeping records of engine manufacturer data indicating compliance with the
standards.

(4) Keeping records of control device vendor data indicating compliance with the
standards.

(5) Conducting an initial performance test to demonstrate compliance with the
emission
standards according to the requirements specified in 40 CFR 60.4212, as
applicable.

[40 CFR 60.4211(b)]

(b) For modified or reconstructed affected emission units that must comply with the
emission standards specified in 40 CFR 60.4204(e) or 40 CFR 60.4205(f), the
permittee shall demonstrate compliance by one of the following methods:

(1) Purchasing, or otherwise owning or operating, an engine certified to the emission
standards in 40 CFR 60.4204(e) or 40 CFR 60.4205(f), as applicable.

(2) Conducting a performance test to demonstrate initial compliance with the
emission standards according to the requirements specified in 40 CFR 60.4212 or
58

40 CFR 60.4213 as appropriate. The test shall be conducted within 60 days after
the engine commences operation after the modification or reconstruction.

[40 CFR 60.4211(e)]

II.B.14.e.2 Recordkeeping:

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

II.B.14.e.3 Reporting:

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

Status: In Compliance. Only DAQ-approved engines have been installed.

II.B.14.f Condition:

For 2007 model year and later emergency stationary affected emission units with a displacement
of less than 30 liters per cylinder that are not fire pump engines, the permittee shall comply with
the emission standards for new nonroad CI engines in 40 CFR 60.4202, for all pollutants, for the
same model year and maximum engine power for the 2007 model year and later emergency
stationary CI ICE. For modified or reconstructed affected emission units, the permittee shall meet
the emission standards for new nonroad CI engines in 40 CFR 60.4202 applicable to the model
year, maximum engine power, and displacement of the modified or reconstructed engine. If the
permittee conducts performance tests in-use on stationary CI ICE with a displacement of less than
30 liters per cylinder they shall meet the not-to-exceed (NTE) standards as indicated in
40 CFR 60.4212.

[Origin: 40 CFR 60 Subpart IIII]. [40 CFR 60.4205(b), 40 CFR 60.4205(e), 40 CFR 60.4205(f),
40 CFR 63 Subpart ZZZZ]

II.B.14.f.1 Monitoring:

The permittee shall comply by purchasing an engine certified to the emission standards in 40
CFR 60.4205(b) for the same model year and maximum engine power. The engine shall be
installed and configured according to the manufacturer's emission-related specifications, except
as permitted in 40 CFR 60.4211(g). [40 CFR 60.4211(c)]

For modified or reconstructed affected emission units that must comply with the emission
standards specified in 40 CFR 60.4205(f), the permittee shall demonstrate compliance by
purchasing, or otherwise owning or operating, an engine certified to the emission standards in 40
CFR 60.4205(f) or by conducting a performance test in accordance with 40 CFR 60.4211(e)(2).
[40 CFR 60.4211(e)]

II.B.14.f.2 Recordkeeping:

The permittee shall keep records of engine certifications indicating compliance with the
standards. The permittee shall keep records demonstrating compliance with the manufacturer's
emission-related specifications for engine installation and configuration, except as permitted in
40 CFR 60.4211(g).
59

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

II.B.14.f.3 Reporting:

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

Status: In Compliance. Only DAQ-approved engines have been installed.

II.B.15 Conditions on NSPS Spark Ignition Internal Combustion Engines (SI ICE).

II.B.15.a Condition:

(a) For stationary SI ICE where construction commenced (i.e., date the affected emission unit is
ordered by the permittee) after June 12, 2006, with a maximum engine power:

(1) Less than or equal to 19 KW (25 HP) manufactured on or after July 1, 2008, the permittee
shall comply with the emission standards in 40 CFR 60.4231(a). [40 CFR 60.4233(a)];

(2) Greater than 19 KW (25 HP) manufactured on or after January 1, 2009 that use gasoline,
the permittee shall comply with the emission standards in 40 CFR 60.4231(b).
[40 CFR 60.4233(b)];

(3) Greater than 19 KW (25 HP) manufactured on or after January 1, 2009 that are rich burn
engines that use LPG, the permittee shall comply with the emission standards in 40 CFR
60.4231(c). [40 CFR 60.4233(c)];

(4) Greater than 19 KW (25 HP) and less than 75 KW (100 HP) (except gasoline and rich
burn engines that use LPG) the permittee shall comply with the emission standards for
field testing in 40 CFR 1048.101(c) for their non-emergency stationary SI ICE and with
the emission standards in Table 1 to 40 CFR 60 Subpart JJJJ for their emergency
stationary SI ICE. For stationary SI ICE with a maximum engine power greater than 19
KW (25 HP) and less than 75 KW (100 HP) manufactured prior to January 1, 2011, that
were certified to the standards in Table 1 to 40 CFR 60 Subpart JJJJ applicable to engines
with a maximum engine power greater than or equal to 100 HP and less than 500 HP, the
permittee may optionally choose to meet those standards. [40 CFR 60.4233(e)]; or

(5) Greater than or equal to 75 KW (100 HP) (except gasoline and rich burn engines that use
LPG), the permittee shall comply with the emission standards in Table 1 to 40 CFR 60
Subpart JJJJ for their stationary SI ICE. For stationary SI ICE with a maximum engine
power greater than or equal to 100 HP (except gasoline and rich burn engines that use
LPG) manufactured prior to January 1, 2011 that were certified to the certification
emission standards in 40 CFR part 1048 applicable to engines that are not severe duty
engines, if such stationary SI ICE was certified to a carbon monoxide (CO) standard above
the standard in Table 1 to 40 CFR 60 Subpart JJJJ, the permittee may meet the CO
certification (not field testing) standard for which the engine was certified.
[40 CFR 60.4233(e)]

(b) For stationary SI ICE that is modified or reconstructed after June 12, 2006 with a maximum
engine power:

60

(1) Less than or equal to 19 KW (25 HP), the permittee shall comply with emission standards
in 40 CFR 60.4231(a) for SI ICE. Engines with a date of manufacture prior to July 1,
2008 shall comply with the emission standards specified in 40 CFR 60.4231(a) applicable
to engines manufactured on July 1, 2008. [40 CFR 60.4233(f)(1)];

(2) Greater than 19 KW (25 HP) that use gasoline, the permittee shall comply with emission
standards in 40 CFR 60.4231(b) for SI ICE. Engines with a date of manufacture prior to
July 1, 2008 (or January 1, 2009 for emergency engines) must comply with the emission
standards specified in §60.4231(b) applicable to engines manufactured on July 1, 2008 (or
January 1, 2009 for emergency engines). [40 CFR 60.4233(f)(2)];

(3) Greater than 19 KW (25 HP) that are rich burn engines that use LPG, the permittee shall
comply with the same emission standards in 40 CFR 60.4231(c). Engines with a date of
manufacture prior to July 1, 2008 (or January 1, 2009 for emergency engines) must
comply with the emission standards specified in §60.4231(c) applicable to engines
manufactured on July 1, 2008 (or January 1, 2009 for emergency engines).
[40 CFR 60.4233(f)(3)];

(4) Greater than 19 KW (25 HP) for SI natural gas and lean burn LPG, the Permittee shall
comply with the same emission standards as those specified in paragraph (a)(4) or (a)(5)
of this condition, except that non-emergency engines and emergency engines greater than
or equal to 130 HP shall meet a nitrogen oxides (NOx) emission standard of 3.0 grams per
HP-hour (g/HP-hr), a CO emission standard of 4.0 g/HP-hr (5.0 g/HP-hr for non-
emergency engines less than 100 HP), and a volatile organic compounds (VOC) emission
standard of 1.0 g/HP-hr, or a NOx emission standard of 250 ppmvd at 15 percent oxygen
(O2), a CO emission standard 540 ppmvd at 15 percent O2 (675 ppmvd at 15 percent O2
for non-emergency engines less than 100 HP), and a VOC emission standard of 86 ppmvd
at 15 percent O2, where the date of manufacture of the engine is:

(i) Prior to July 1, 2007, for non-emergency engines with a maximum engine power
greater than or equal to 500 HP (except lean burn natural gas engines and LPG
engines with a maximum engine power greater than or equal to 500 HP and less
than 1,350 HP);

(ii) Prior to July 1, 2008, for non-emergency engines with a maximum engine power
less than 500 HP.

(iii) Prior to January 1, 2009, for emergency engines;

(iv) Prior to January 1, 2008, for non-emergency lean burn natural gas engines and
LPG engines with a maximum engine power greater than or equal to 500 HP and
less than 1,350 HP.
[40 CFR 60.4233(f)(4)]

(c) Deadline for importing or installing affected emission units produced in the previous model
year:

(1) After July 1, 2010, the permittee shall not install stationary SI ICE with a maximum
engine power of less than 500 HP that do not meet the applicable requirements in sections
in (a) and (b) of this condition. [40 CFR 60.4236(a)]

61

(2) After July 1, 2009, the permittee shall not install stationary SI ICE with a maximum
engine power of greater than or equal to 500 HP that do not meet the applicable
requirements in sections in (a) and (b) of this condition, except that lean burn engines with
a maximum engine power greater than or equal to 500 HP and less than 1,350 HP that do
not meet the applicable requirements in sections in (a) and (b) of this condition may not be
installed after January 1, 2010. [40 CFR 60.4236(b)]

(3) For emergency stationary SI ICE with a maximum engine power of greater than 19 KW
(25 HP), the permittee shall not install engines that do not meet the applicable
requirements in sections in (a) and (b) of this condition after January 1, 2011.
[40 CFR 60.4236(c)]

(4) In addition to the requirements specified in 40 CFR 60.4231 and sections in (a) and (b) of
this condition, it is prohibited to import SI ICE less than or equal to 19 KW (25 HP),
stationary rich burn LPG SI ICE, and stationary gasoline SI ICE that do not meet the
applicable requirements specified in paragraphs (1), (2), and (3) of section (c) of this
condition, after the date specified in paragraph (1), (2), and (3) of section (c) of this
condition. [40 CFR 60.4236(d)]

(5) The requirements of section (c) of this condition 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(e)]

(d) For stationary SI ICE that are required to meet standards that reference 40 CFR 1048.101 the
permittee shall, if testing their engines in use, meet the standards in that section applicable to
field testing, except as indicated in paragraph (a)(5). [40 CFR 60.4233(h)]
(e) The permittee shall operate and maintain affected emission units that achieve the emission
standards as required in this condition over the entire life of the engine. [40 CFR 60.4234]

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

[Origin: 40 CFR 60 Subpart JJJJ]. [40 CFR 60.4233, 40 CFR 60.4234, 40 CFR 60.4236,
40 CFR 60.4243, 40 CFR 63 Subpart ZZZZ]

II.B.15.a.1 Monitoring:

(a) For stationary SI internal combustion engines subject to (a)(1) through (a)(3) of
condition II.B.15.a, the permittee shall comply by purchasing an engine certified to
the emission standards in 40 CFR 60.4231(a) and (c), as applicable, for the same
engine class and maximum engine power. In addition, the permittee shall meet one of
the requirements specified in (a)(1) and (2) of this section.

(1) If the permittee operates and maintains the certified stationary SI internal
combustion engine and control device according to the manufacturer's emission-
related written instructions, the permittee shall keep records of conducted
maintenance to demonstrate compliance, but no performance testing is required
for the permittee. The permittee shall also meet the requirements as specified in
40 CFR part 1068, subparts A through D, as they apply. If the permittee adjusts
62

engine settings according to and consistent with the manufacturer's instructions,
the affected emission unit will not be considered out of compliance.

(2) If the permittee does not operate and maintain the certified stationary SI internal
combustion engine and control device according to the manufacturer's emission-
related written instructions, the engine will be considered a non-certified engine,
and the permittee shall demonstrate compliance according to (a)(2)(i) through (iii)
of this section, as appropriate.

(i) If the stationary SI internal combustion engine is less than 100 HP, the
permittee shall keep a maintenance plan and records of conducted
maintenance to demonstrate compliance and shall, to the extent practicable,
maintain and operate the engine in a manner consistent with good air
pollution control practice for minimizing emissions, but no performance
testing is required for the permittee.

(ii) If the stationary SI internal combustion engine is greater than or equal to 100
HP and less than or equal to 500 HP, the permittee 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 within 1 year of engine
startup to demonstrate compliance.

(iii) If the stationary SI internal combustion is greater than 500 HP, the permittee
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 within 1
year of engine startup and conduct subsequent performance testing every
8,760 hours or 3 years, whichever comes first, thereafter to demonstrate
compliance. [40 CFR 60.4243(a)]

(b) For stationary SI internal combustion engine subject to (a)(4) or (5) of condition
II.B.15.a, the permittee shall demonstrate compliance according to one of the methods
specified in paragraphs (b)(1) and (2) of this section.

(1) Purchasing an engine certified according to procedures specified in this condition,
for the same model year and demonstrating compliance according to one of the
methods specified in paragraph (a) of this section.

(2) Purchasing a non-certified engine and demonstrating compliance with the
emission standards specified in (a)(4) or (5) of this condition and according to the
requirements specified in 40 CFR 60.4244, as applicable, and according to
paragraphs (b)(2)(i) of this section.

(i) If the stationary SI internal combustion engine is greater than 25 HP and less
than or equal to 500 HP, the permittee 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
63

permittee shall conduct an initial performance test to demonstrate
compliance. [40 CFR 60.4243(b)]

(ii) If the stationary SI internal combustion engine is greater than 500 HP, the
permittee 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 and conduct subsequent performance testing every 8,760
hours or 3 years, whichever comes first, thereafter to demonstrate
compliance. [40 CFR 60.4243(b)]

(c) For affected emission units subject to (b) of condition II.B.15.a:

(1) The permittee shall demonstrate compliance according to paragraph (b)(2)(i) or
(ii) of this section, except that if the permittee complies according to paragraph
(b)(2)(i) of this section, the permittee demonstrates that the non-certified engine
complies with the emission standards specified in section (b) of this condition.
[origin 40 CFR 60.4243(c)]

(2) For modified or reconstructed stationary SI internal combustion engines the
permittee shall demonstrate compliance according to one of the methods specified
in paragraphs (i) or (ii) below:

(i) Purchasing, or otherwise owning or operating, an engine certified to the
emission standards in (b) of condition II.B.15.a as applicable, or

(ii) Conducting a performance test to demonstrate initial compliance with the
emission standards according to the requirements specified in 40 CFR
60.4244. The test shall be conducted within 60 days after the engine
commences operation after the modification or reconstruction.
[40 CFR 60.4243(i)]

II.B.15.a.2 Recordkeeping:

(a) For each affected emission unit, the permittee shall keep records of the information in
paragraphs (a)(1) through (4) of this section.

(1) All notifications submitted to comply with this condition and all documentation
supporting any notification.

(2) Maintenance conducted on each affected emission unit.

(3) If the affected emission unit is a certified engine, documentation from the
manufacturer that the affected emission unit is certified to meet the emission
standards and information as required in 40 CFR parts 1048, 1054, and 1060, as
applicable.

(4) If the affected emission unit is not a certified engine or is a certified engine
operating in a non-certified manner and subject to section (a)(2) of monitoring,
64

documentation that the engine meets the emission standards. [origin 40 CFR
60.4245(a)]

(b) The permittee shall keep records of the install date for each affected emission unit and
the applicable requirements under 40 CFR 60 Subpart JJJJ for the respective model
year engine.

(c) Records in section (a) and results of monitoring shall be maintained in accordance
with Provision I.S.1 of this permit.

II.B.15.a.3 Reporting:

In addition to the reporting requirements specified in Section I of this permit, the permittee shall
submit the following notifications and reports.

(a) For affected emission units greater than or equal to 500 HP that have not been
certified by an engine manufacturer to meet the emission standards in 40 CFR
60.4231, the permittee shall submit an initial notification as required in 40 CFR
60.7(a)(1). The notification shall include the information in paragraphs (a)(1) through
(5) of this section.

(1) Name and address of the permittee;

(2) The address of the affected emission unit;

(3) Engine information including make, model, engine family, serial number, model
year, maximum engine power, and engine displacement;

(4) Emission control equipment; and

(5) Fuel used. [40 CFR 60.4245(c)]

(b) For affected emission units that are subject to performance testing, the permittee shall
submit a copy of each performance test as conducted in 40 CFR 60.4244 within 60
days after the test has been completed. [40 CFR 60.4245(d)]

Status: In Compliance. The certified spark ignition engines are maintained and operated
accordingly. Annual maintenance is conducted in-house and records are kept.

II.B.15.b 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.

65

(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).

The permittee may operate stationary SI natural gas fired engines using propane for a maximum of
100 hours per year as an alternative fuel solely during emergency operations, but the permittee
shall keep records of such use. If propane is used for more than 100 hours per year in an engine
that is not certified to the emission standards when using propane, the permittee is required to
conduct a performance test to demonstrate compliance with the emission standards of 40 CFR
60.4233.

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

II.B.15.b.1 Monitoring:

To determine the duration of operation the permittee shall install a non-resettable hour meter for
each emergency stationary ICE. [DAQE-AN100080048-21]

Records required for this permit condition will serve as monitoring.

II.B.15.b.2 Recordkeeping:

Records of each emergency stationary ICE shall be kept on a monthly basis in an operation and
maintenance log. Records shall distinguish between maintenance-related hours and emergency
use-related hours. If additional hours are to be used for maintenance checks and readiness testing,
the permittee shall maintain records indicating that federal, state, or local standards require
maintenance and testing of emergency ICE beyond 100 hours per calendar year.
[40 CFR 60.4243(d)]

The permittee shall keep records of the operation for each stationary ICE in emergency and non-
emergency service that are recorded through the non-resettable hour meter. The permittee shall
record the date each engine was used, the duration of operation of each engine, and the reason
each engine was in operation during that time.

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

II.B.15.b.3 Reporting:
66

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

Status: In Compliance. Non-resettable hour meters are installed. Hours of operation records were
reviewed at time of the inspection.

II.B.15.c Condition:

The permittee shall use gasoline that meets the per gallon sulfur limit in 40 CFR 1090.205.
[Origin: 40 CFR 60 Subpart JJJJ]. [40 CFR 60.4235, 40 CFR 63 Subpart ZZZZ]

II.B.15.c.1 Monitoring:

For each delivery of gasoline, the permittee shall either:

(1) Determine the fuel sulfur content expressed as ppm; or

(2) Inspect the fuel sulfur content expressed as ppm determined by the vendor using
methods of the ASTM; or

(3) Inspect documentation provided by the vendor that indirectly demonstrates
compliance with this provision.

II.B.15.c.2 Recordkeeping:

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

II.B.15.c.3 Reporting:

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

Status: In Compliance. Fuel records were reviewed at time of the inspection.

II.B.15.d Condition:

All natural gas-fired generators shall not exceed 10% opacity.
[Origin: DAQE-AN100080048-21]. [R307-401-8]

II.B.15.d.1 Monitoring:

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

II.B.15.d.2 Recordkeeping:

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

II.B.15.d.3 Reporting:

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

Status: In Compliance. Only natural gas is burned in these engines.
67

II.B.16 Conditions on NESHAP Existing Emergency CI ICE less than 500 hp.

II.B.16.a Condition:

The permittee shall comply with the following operating limitations and other requirements at all
times for each emergency affected emission unit:

1. The permittee shall operate the affected emission unit according to the requirements in
paragraphs 1.a through 1.c. In order for the engine to be considered an emergency stationary
RICE under 40 CFR 63 Subpart ZZZZ, any operation other than as described in 40 CFR
63.6640(f), is prohibited. If the engine is not operated according to the requirements in 40
CFR 63.6640(f), it will not be considered an emergency engine and shall meet all
requirements for non-emergency engines.

a. There is no time limit on the use of emergency stationary RICE in emergency situations.

b. Emergency stationary RICE may be operated for any combination of the purposes
specified in 40 CFR 63.6640(f)(2) for a maximum of 100 hours per calendar year. Any
operation for nonemergency situations as allowed by 40 CFR 63.6640(f)(4) counts as part
of the 100 hours per calendar year allowed by this paragraph.

(i) Emergency stationary RICE 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 RICE beyond 100 hours per calendar year.

c. The permittee may operate the emergency stationary RICE up to 50 hours per calendar
year in nonemergency situations as specified in 40 CFR 63.6640(f)(4).

2. The permittee shall meet the following requirements at all times, except during periods of
startup:

a. Change oil and filter every 500 hours of operation or annually, whichever comes first;

b. Inspect air cleaner every 1,000 hours of operation or annually, whichever comes first, and
replace as necessary; and

c. Inspect all hoses and belts every 500 hours of operation or annually, whichever comes
first, and replace as necessary.

3. During periods of startup, the permittee shall minimize the engine's time spent at idle and
minimize the engine's startup time to a period needed for appropriate and safe loading of the
engine, not to exceed 30 minutes, after which time the non-startup emission limitations apply.

4. The permittee shall comply with the applicable general provisions in 40 CFR 63.1-15 as
identified in Table 8 of 40 CFR 63 Subpart ZZZZ.

68

[Origin: 40 CFR 63 Subpart ZZZZ]. [40 CFR 63.6595(a)(1), 40 CFR 63.6602, 40 CFR
63.6605(a), 40 CFR 63.6625(h), 40 CFR 63.6640(f), 40 CFR 63.6665, 40 CFR 63 Subpart ZZZZ
Table 2d, 40 CFR 63 Subpart ZZZZ Table 8]

II.B.16.a.1 Monitoring:

To determine the duration of operation, the permittee shall install a non-resettable hour meter for
each emergency emission unit if one is not already installed. [DAQE-AN100080048-21]

If an emergency engine is operating during an emergency and it is not possible to shut down the
engine in order to perform the management practice requirements on the required schedule, or if
performing the management practice on the required schedule would otherwise pose an
unacceptable risk under federal, state, or local law, the management practice can be delayed until
the emergency is over or the unacceptable risk under federal, state, or local law has abated. The
management practice shall be performed as soon as practicable after the emergency has ended or
the unacceptable risk under federal, state, or local law has abated. [40 CFR 63 Subpart ZZZZ
Table 2d Footnote 2]

The permittee shall demonstrate continuous compliance by operating and maintaining the
stationary RICE and after-treatment control device (if any) according to the manufacturer's
emission-related written operation and maintenance instructions or develop and follow their own
maintenance plan which must provide to the extent practicable for the maintenance and operation

of the engine in a manner consistent with good air pollution control practice for minimizing
emissions. [40 CFR 63.6625(e), 40 CFR 63.6640(a), 40 CFR 63 Subpart ZZZZ Table 6]

The permittee has the option of utilizing an oil analysis program in order to extend the specified
oil change requirement in accordance with 40 CFR 63.6625(i).

The permittee shall comply with the applicable general provisions in 40 CFR 63.1-15 as
identified in Table 8 of 40 CFR 63 Subpart ZZZZ. [40 CFR 63.6665]

II.B.16.a.2 Recordkeeping:

The permittee shall keep the records described in 40 CFR 63.6655(a)(1)-(5) as applicable.
[40 CFR 63.6655(a)]

For each affected emission unit the permittee shall keep records of the hours of operation of the
engine that are recorded through the non-resettable hour meter. The permittee shall document how
many hours are spent for emergency operation, including what classified the operation as
emergency and how many hours are spent for non-emergency operation. [40 CFR 63.6655(f),
DAQE-AN100080048-21]

If additional hours are to be used for maintenance checks and readiness testing, the permittee shall
maintain records indicating that federal, state, or local standards require maintenance and testing
of emergency RICE beyond 100 hours per year. [40 CFR 63.6640(f)(2)(i)]

The permittee shall keep records that demonstrate continuous compliance with each applicable
operating limitation [including, but not limited to, the manufacturer's emission-related operation
and maintenance instructions or the permittee-developed maintenance plan]. [40 CFR 63.6655(d),
40 CFR 63 Subpart ZZZZ Table 6]
69

Records of the maintenance conducted shall be kept in order to demonstrate that the permittee
operated and maintained the affected emission unit and after-treatment control device (if any)
according to their own maintenance plan. [40 CFR 63.6655(e)]

The permittee shall comply with the applicable general provisions in 40 CFR 63.1-15 as
identified in Table 8 of 40 CFR 63 Subpart ZZZZ. [40 CFR 63.6665]

Records shall be maintained in accordance with 40 CFR 63.6660 and Provision I.S.1 of this
permit.

II.B.16.a.3 Reporting:

The permittee shall report any failure to perform the management practice on the schedule
required and the federal, state or local law under which the risk was deemed unacceptable. [40
CFR 63 Subpart ZZZZ Table 2d Footnote 2]

The permittee shall comply with the applicable general provisions in 40 CFR 63.1-15 as
identified in 40 CFR 63 Subpart ZZZZ Table 8. [40 CFR 63.6665]

The permittee shall also report each instance in which it did not meet the applicable requirements
in Table 8. [40 CFR 63.6640(e)]

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

Status: In Compliance. The engines are maintained and operated accordingly. Annual maintenance
is conducted in-house and recorded. Non-resettable hour meters are installed. Maintenance
records and hour-of-operation records were reviewed at time of the inspection.

II.B.16.b Condition:

At all times the permittee shall operate and maintain any affected source, including associated air
pollution control equipment and monitoring equipment, in a manner consistent with safety and
good air pollution control practices for minimizing emissions. The general duty to minimize
emissions does not require the permittee to make any further efforts to reduce emissions if levels
required by this standard have been achieved. Determination of whether such operation 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, review of operation and maintenance
procedures, review of operation and maintenance records, and inspection of the source.
[Origin: 40 CFR 63 Subpart ZZZZ]. [40 CFR 63.6595(a)(1), 40 CFR 63.6605(b)]

II.B.16.b.1 Monitoring:

Records required for this permit condition will serve as monitoring.

II.B.16.b.2 Recordkeeping:

The permittee shall keep the records described in 40 CFR 63.6655(a)(1)-(5) as applicable. [40
CFR 63.6655(a)] The permittee shall document activities performed to assure proper operation and
maintenance. Records shall be maintained in accordance with 40 CFR 63.6660 and Provision I.S.1
of this permit.
70

II.B.16.b.3 Reporting:

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

Status: In Compliance. The engines are maintained and operated accordingly. Annual maintenance
is conducted in-house and recorded. Maintenance records were reviewed at time of the
inspection.

II.B.17 Conditions on Emergency Water Pump Engines.

II.B.17.a Condition:

The permittee shall only install and operate one (1) 66 hp diesel emergency reheat cooling water
pump engine, one (1) 368 hp diesel emergency main pumphouse cooling water pump engine, and
one (1) 4.3L natural gas emergency mold water pump engine at all times. The total emergency
water pump engines installed and operating shall not exceed three (3) engines.
[Origin: DAQE-AN100080048-21]. [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:

The permittee shall keep records of each installed emergency water pump engine along with the
installation date for each. Records shall be maintained as described in 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. There is only one 66 hp diesel engine, one 368 hp diesel engine, and one 4.3
L natural gas engine currently operating as emergency water pump engines.

II.B.18 Condition on Maintenance Building Equipment.

II.B.18.a Condition:

The fabrication shop baghouse shall not exceed 10% opacity. [Origin: DAQE-AN100080048-21].
[R307-401-8]

II.B.18.a.1 Monitoring:

A visual opacity survey of each affected emission unit shall be performed on a weekly basis 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 of that emission unit shall be performed by a certified visible
emissions observer in accordance with 40 CFR 60, Appendix A, Method 9 within 24 hours of the
initial observation.
71

II.B.18.a.2 Recordkeeping:

Records of visual observations performed and data required by 40 CFR 60, Appendix A, Method 9
shall be maintained in accordance with 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. No visible emissions were observed during this inspection. Weekly opacity
observations have been performed and recorded.

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

Status: Not Applicable

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

Status: Not Applicable

SECTION III: PERMIT SHIELD

The following requirements have been determined to be not applicable to this source in
accordance with Provision I.M, Permit Shield:

III.A. R307-303 (Commercial Cooking)

This regulation is not applicable to the Permitted Source for the following reason(s): Although
Nucor Steel is located in Box Elder county and has a cafeteria onsite for the convenience of its
employees, the cafeteria does not operate a chain-driven charbroiler. Therefore, the regulations in
R307-303 do not apply to the cafeteria at Nucor Steel. [Last updated February 26, 2021]

III.B. R307-415-3 (Major Source Definition)

This regulation is not applicable to the Permitted Source for the following reason(s): Nucor Bar
Mill Group and Western Metal Recycling are not a single major source under this definition.
Although contiguous and under a common corporate ownership, they are not under common
control, not in a single major industrial grouping, and each facility can exist without the operation
or presence of the other. [Last updated March 28, 2020]

SECTION IV: ACID RAIN PROVISIONS

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

72

Approval Order (AO) DAQE- AN100080050-24
SECTION I: GENERAL PROVISIONS

I.1 All definitions, terms, abbreviations, and references used in this AO conform to those used in
the UAC R307 and 40 CFR. Unless noted otherwise, references cited in these AO conditions
refer to those rules. [R307-101]
Status: This is not an inspection item.

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

Status: In Compliance. No limit exceedances were found during this inspection.

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

Status: In Compliance. No unapproved modifications were discovered.

I.4 All records referenced in this AO or in other applicable rules, which are required to be kept by
the owner/operator, shall be made available to the Director or Director's representative upon
request, and the records shall include the five-year period prior to the date of the request.
Unless otherwise specified in this AO or in other applicable state and federal rules, records
shall be kept for a minimum of five (5) years. [R307-401-8]

Status: In Compliance. All requested records have been made available.

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

Status: In Compliance. The source appeared to be operated and maintained in a manner
consistent with good air pollution control practices. Texas Instruments utilizes SAP
software for their preventative maintenance program. Maintenance records are kept.

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

Status: In Compliance. The company is aware of the breakdown rule and reports when necessary.

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

Status: In Compliance. Emission inventories have been submitted as required.

73

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

Status: Not Evaluated. The owner/operator has 18 months from the date of this AO to submit
this notice.

SECTION II: PERMITTED EQUIPMENT
II.A THE APPROVED EQUIPMENT

II.A.1 Nucor Plymouth Minimill
Electric Arc Furnace Steel Mill
II.A.2 Melt Shop Equipment and Operations
Melt shop operations include: skull lancing; natural gas-fired horizontal and
vertical ladle preheaters; tundish preheaters; ladle/ tundish demolition,
reconstruction, rebricking and torching.
Control: EAF Baghouse

II.A.3 Two (2) Electric Arc Furnaces
Capacity: 65-tons each
Includes: natural gas oxy-fuel fired burners and oxygen lances and flux/carbon
addition and injection systems
Control: EAF baghouse. Direct emission control (DEC) system during
melting/refining and by a canopy evacuation system during charging/tapping.
NSPS Applicability: Subpart AAa

II.A.4 Caster and associated equipment
Continuous casting system with provisions for alloy addition; supplemental
oxygen injection heating; backup alloy stir station; and automatic and manual
torching operations to cut billets to length.
Control: EAF baghouse

II.A.5 Seven (7) Storage silos
A. One (1) EAF Baghouse Material Storage Silo
B. Two (2) Lime/Dolomite
Storage Silos Control:
Fabric Filter baghouse(s)
C. Two (2) Carbon Storage Silos
Control: Internal venting; EAF baghouse
D. Two (2) Carbon
Process Silos
74

Control: Baghouse
Filter Each

II.A.6 Scrap/scrap substitute handling operations
II.A.7 Slag stockpiles*
*The stockpiles are listed for informational purposes only.

II.A.8 Raw Materials Handling System
Alloy, Coal, and Flux Unloading, Storage, and Charge Bucket Loading
A. Northeast Rail Station
B. Melt Shop Station(s)
II.A.9 Billet reheat
furnace #1 Fuel:
Natural
Gas/Propane
Control: Low-NOx
burners
Maximum NOx Burner Rating: 0.090 lb
NOx/MMBTU Capacity: 1320 MMcf/yr

II.A.10 Billet reheat furnace #2
Fuel: Natural
Gas/Propane Control:
Ultra-Low NOx burners
Maximum NOx Burner Rating: 0.075 lb
NOx/MMBTU Capacity: 980 MMcf/yr

II.A.11 Water desalination plant
Plant-wide water treatment

II.A.12 Associated mobile equipment*
*This equipment is listed for informational purposes only.

II.A.13 Miscellaneous parts washers

II.A.14 Sandblast station(s)
II.A.15 Six (6) Water Cooling Systems*
*includes one (1) new system with two (2) new cooling towers with 0. 0005% drift
eliminators each
Control: High efficiency drift eliminator Cooling Tower Cells (Each)
II.A.16 Lime, fluorspar, charge carbon, and alloy handling
II.A.17 Miscellaneous Gas-Fired Equipment
Miscellaneous plant-wide natural gas/propane cutting torches and
burners Rating: Less than 1 MMBtu/hour Each
*This equipment is listed for informational purposes only.
75

II.A.18 Hot steel rolling operations
Control: Internally venting baghouses
II.A.19 Scrap Steel Stockpiles*
*This equipment is listed for informational purposes only.
II.A.20 Fuel Storage Tanks
Contents: Diesel and
Gasoline Capacity: Less
than 19,812 gallons
MACT Applicability: Subpart CCCCCC

II.A.21 Two (2) Mold Backup Water Pump Engines
Mold Water Emergency Pump Engine
Fuel: Natural Gas
Spare Mold Water Emergency Pump Engine Fuel: Natural GasNSPS Applicability: Subpart
JJJJ MACT Applicability: Subpart ZZZZ

II.A.22 One (1) Di-ethylene glycol storage tank
Capacity: 12,000 gallons

II.A.23 Paint Dip Line

II.A.24 Roll Mill #1
Roll Mill Heat Retention
Boxes Fuel: Natural Gas
Controls:
Jump Mill Baghouse
Abrasive Saw Shack Baghouse

II.A.25 Unpowered Ladle Stir Stations/Powered LMFs*
Ladle Metallurgy Furnaces (LMFs)
*electric powered

II.A.26 Ladle Vacuum Degasser
Burner rating: 0.005 lb
NOx/ton Control: Flare
II.A.27 EAF hydraulics Engines
Fuel: Natural Gas
II.A.28 Maintenance Building Equipment
Control: Fabrication Shop Baghouse
II.A.29 Three (3) Natural Gas Emergency Generators
Capacities: One (1) - 100 hp or
less Two (2) - 460 hp or less
Each NSPS Applicability:
Subpart JJJJ
MACT Applicability: Subpart ZZZZ

II.A.30 One (1) Diesel Emergency Generator
Capacities: 51 hp or less
76

NSPS Applicability: Subpart IIII
MACT Applicability: Subpart
ZZZZ

II.A.31 Reheat Backup Water Pump Engine
Reheat #2 Emergency Cooling Water Pump Engine
Rating: 66 hp (36 kW)
Fuel: Diesel
NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

II.A.32 Six (6) Gasoline Emergency Generators
Capacities: Less than 25hp Each
NSPS Applicability: Subpart JJJJ
MACT Applicability: Subpart ZZZZ

II.A.33 Two (2) Diesel Emergency Generator Engines (NEW)
Capacity: 900hp Each
Fuel: Diesel
NSPS Applicability: Subpart IIII
MACT Applicability: Subpart ZZZZ

Status: Undetermined. No discrepancies for equipment II.A.1 through II.A.32 were noted. The
equipment in II.A.33 has been installed and is being operated. The plate rating on the
generators states 1,112 hp, which is different than the 900 hp listed in the AO. The
generators are both Cat model C18, and documentation from Cat (which was provided
during inspection) states these engines are capable of producing 600 kWh at 900 bhp.
However, these engines were manufactured one year newer (2023) than those used for
modeling potential emissions during the approval order process, and potentially
produce different emissions levels. Tentatively, based on information the source has
received from the manufacturer, it is currently believed the installed engines produce
emissions at the rates used during the approval order process. DAQ’s Major New
Source Review section is aware of this discrepancy and is looking into this during the
Title V renewal process.

SECTION II: SPECIAL PROVISIONS
II.A REQUIREMENTS AND LIMITATIONS

II.B.1 Site-wide Limitations

Requirements of conditions II.B.1.a through II.B.6.a are included in the Title V Operating Permit
evaluated above.

II.B.6.b The owner/operator shall only operate one (1) backup water pump engine (II.A.21 and II.A.31)
at any time. The total backup water pump engines installed shall not exceed three (3) engines.
[R307-401-8]

Status: In Compliance. Only one backup water pump operates at any time.

77

EMISSION INVENTORY: Taken from DAQ’s emission inventory database for 2023:

Pollutants Tons/Year
PM10 48.04
PM2.5 36.08
SOx 100.51
NOx 229.26
VOC 92.45
CO 1,402.51

PREVIOUS ENFORCEMENT
ACTIONS:

None within the last five years

COMPLIANCE ASSISTANCE: None required

COMPLIANCE STATUS &
RECOMMENDATIONS:

Nucor Steel should be found in compliance with the conditions of the
Title V permit and Approval Order evaluated at the time of this
inspection.

HPV STATUS: Not Applicable

RECOMMENDATION FOR NEXT
INSPECTION:

Inspect as usual
ATTACHMENTS: VEO Form