Title: afgafgasdgfsd
Author: Bruce Ferguson
Last saved by: Brad Luke
Company: None

Permit Review Summary
Page

PERMIT REVIEW SUMMARY

Permit Writer:	Brad Luke 	Date:	September 23, 2026
Company Name:	Southwire Company, LLC
Facility Location:	103 Airport Road
Starkville, MS 39760
Source Number:	2060-00002
County: 		Oktibbeha

FACILITY DESCRIPTION

Southwire Company, LLC (“Southwire”) is an existing industrial facility that primarily produces insulated, bare, and armored copper and aluminum building wire. The facility’s overall operation falls under SIC Code 3357 (Drawing and Insulating of Nonferrous Wire) and NAICS Code 331420 (Copper Rolling, Drawing, Extruding, and Alloying). Activities associated with the manufacturing of wire and cable include drawing, stranding, insulating, printing, jacketing, curing, armoring, annealing, and packaging. The facility’s maximum uncontrolled emissions would result in it being a major source of hazardous air pollutants (HAPs); however, Southwire has taken emission limitations on individual HAPs and total combined HAPs to avoid HAP major status. The rest of the facility’s maximum uncontrolled emissions fall below the Title V major source threshold and the prevention of significant deterioration (PSD) major source threshold.

PROJECT/PERMIT ACTION DESCRIPTION

Southwire has requested a renewal of the Synthetic Minor Operating Permit (SMOP) issued to the facility on September 9, 2021, and modified on May 16, 2023. The facility is proposing the addition of new equipment, removal of existing equipment, and creation of new Emission Points to better reflect actual operations. 

Label printing operations were previously grouped under extrusion operations and Steam‑Cured CV line operations (Emission Points AA‑007 and AA‑013). These label printing activities have now been assigned a separate unit ID: Emission Point AA‑027. 

For the Nitrogen‑Cure CV line, Emission Point AA‑026 will cover the extrusion portion of the line, while Emission Point AA‑009 will represent the curing portion. With the addition of new proposed extrusion and CV extrusion lines under Nitrogen‑Cure CV line operations (Emission Points AA‑007 and AA‑026), emissions from label printing (Emission Point AA‑027) are expected to increase. 

All curing emissions from Extrusion Operations (Emission Point AA‑007), Steam‑Cured CV Line Operations (Emission Point AA‑013), and Nitrogen‑Cured CV Line Operations (Emission Point AA‑026) are consolidated under Curing Operations (Emission Point AA‑019).

Rubber emission factors for extrusion operations (Emission Point AA‑007), armoring operations (Emission Point AA‑015), and Nitrogen‑Cure CV line operations (Emission Point AA‑026) have been updated to reflect the facility’s primary use of Compound No. 9 (EPDM/EPR) and Compound No. 21 (CPE). This update increases emissions of carbon disulfide and individual HAPs, although total HAPs for these emission points have decreased.

The facility also has the capability to use Compound No. 11 (Neoprene), which has a high emission factor for carbon disulfide. Including this compound results in a significant potential increase in carbon disulfide emissions. Additional compounds including tired base (#4), tired tread (#6), and SBR (#22) are also included to be conservative.

The modifications listed above do not represent all modifications only those that apply to multiple Emission Points, the following table lists all modifications proposed by Southwire:

Emission Point | Description | Status | Proposed Changes
AA-001 | 10.461 MMBTU / hour Natural Gas-Fired Boiler [manufactured in 1996] | Operating | Replace with Emission Point AA-024 but remain in the permit until decommissioned
AA-002 | 10.461 MMBTU / hour Natural Gas-Fired Boiler [manufactured in 1979] | Operating | Replace with Emission Point AA-025 but remain in the permit until decommissioned
AA-003 | 4.55 MMBTU / hour Natural Gas-Fired Boiler [manufactured in December 2018] | Operating | No Changes Proposed
AA-007 | Extrusion Operations [includes nine (9) extrusion lines each consisting of non-ferrous wire insulating] | Proposed | Add two (2) extrusion lines (E-18 and E-19) and have already removed three (3) extrusion lines (E-2, E-12, and E-16), assigned label printing operations to the new Emission Point AA-027, additionally the types of compounds that can be extruded on each line and the associated emissions have been corrected to reflect current operations while maximum throughput remains unchanged, updated rubber emission factors
AA-008 | Bake-Off Ovens [consists of two (2) ovens each with 0.23 MMBTU / hour natural gas-fired afterburners used to remove insulation residue from tooling and dies by oxidizing VOCs released during the bake-off process] | Proposed | Add new tool-cleaning bake-off oven with a burner capacity of 0.23 MMBtu/hr to increase facility-wide number of bake-off ovens to two (2)
AA-012 | Metal Drawing Machine Operations [includes seven (7) drawing machines with in-line annealers] | Proposed | Remove and replace all existing drawing machines with aluminum drawing machine (D-16) rated at 4,167 lb / hour, and one new copper drawing machine (D-17) rated at 15,300 lb / hour. Existing drawing machines (D‑1, D‑2, D‑3, D‑4, and D-11) will be removed. Several drawing machines (D‑12, D‑13, D-14 and D‑15) were previously permitted under Emission Point AA-012 but never installed or are not operational. The new aluminum drawing machine will have the capability to draw both copper and aluminum. To ensure the facility has permit coverage during the commissioning and replacement process, all drawing machines (D-1, D-2, D-3, D-4, D-11, D16, and D17) will be included under AA-012. Emissions calculations have been updated accordingly.
AA-013 | Steam-Cured CV Line Operations [consists of four (4) extruders and their respective pellet hopper feed systems] | Operating | Assigned label printing operations to a new Emission Point (Emission Point AA-027)
AA-015 | Armoring Line Operations [constructs aluminum or steel flexible conduit around insulated wire / cable] | Operating | Add an additional armoring line increasing the total to ten (10), updated rubber emission factors
AA-016 | Maintenance Welding Operations | Operating | No Changes Proposed
AA-017 | Blasting Operations [consists of two (2) enclosed cabinets that remove insulation residue from extrusion tooling and dies] | Operating | Add an additional sandblaster increasing total to two (2)
AA-018 | Cooling Towers [provides process water for extrusion lines and other manufacturing operations] | Proposed | Add an additional 1,600-gpm cooling tower, emissions recalculated as previous emissions massively overestimated water loss and emissions
AA-019 | Curing Operations [consists of emissions as a byproduct of extrusion processes. Note: This is an emission source category and not a physical unit.] | Proposed | Add four (4) additional nitrogen-cure CV lines, no additional degreasing lines will be installed as part of this expansion, updated to clarify that it represents an emissions category only and is not a physical emission unit.
AA-020 | Tooling Cleaning Operations [consists of two (2) electric-powered ovens that cleans insulation residue off of extrusion tooling and dies; one (1) oven serves as the primary unit while the other is a back-up unit] | Operating | No Changes Proposed
AA-021 | 5.6 MMBTU / hour Natural Gas-Fired Annealing Oven | Operating | No Changes Proposed
AA-022 | Air Plasma Surface Treatment Operations | Operating | Not an Emission Source
AA-023 | Degassing Ovens [consists of two (2) ovens each with a 2.0 MMBTU / hour natural gas-fired burner and a centrifugal exhaust fan to vent volatiles produced; accelerates the curing process of finished cable] | Removed | Removed from the facility and no additional degreasing lines will be installed as part of the expansion of Emission Point AA-019
AA-024 | 12.00 MMBTU / hour Natural Gas-Fired Boiler [manufactured in 2027] | Proposed | Replace Emission Point AA-001 after it is decommissioned and will not begin operating until Emission Point AA-001 is removed
AA-025 | 12.00 MMBTU / hour Natural Gas-Fired Boiler [manufactured in 2027] | Proposed | Replace Emission Point AA-002 after it is decommissioned and will not begin operating until Emission Point AA-002 is removed
AA-026 | Nitrogen-Cured CV Line Operations [consists of four (4) extruders and their respective pellet hopper feed systems] | Proposed | Add four (4) nitrogen-cure CV extrusion lines, Emission Point AA-026 will represent the extrusion portion of these lines, while Emission Point AA-019 will represent the curing portion, updated rubber emission factors
AA-027 | Printing Operations | Operating | Reorganization of existing label printing operations into new Emission Point, previously included in the extrusion lines (Emission Points AA-007, AA-013, and AA-026). With addition of new proposed extrusion and CV extrusion lines, label printing emissions are expected to increase.
AB-007 | 25,000-Gallon Diesel Fuel Storage Tank | Removed | Removed from the facility as of July 10, 2026
AB-008 | 5,500-Gallon Used Drawing Solution (Mineral Oil) Storage Tank | Operating | Updated to Reflect Correct Contents of the tank, changed from Polypropylene to Used Drawing Solution (Mineral Oil)
AB-009 | 6,000-Gallon Diesel Fuel Storage Tank | Removed | Removed from the facility
AD-002 | One (1) 157 HP (117 kW) Diesel Fuel-Fired Emergency Pump Engine (ICE) [total heat input: 1.12 MMBTU / hour; manufactured in 2011] | Removed | Removed from the facility as of September 4, 2026.
AD-003 | One (1) 200 hp (156 kW) Diesel Fuel-Fired Emergency Pump Engine (ICE) [total heat input: 1.46 MMBTU / hour] | Proposed | Add one additional diesel fuel-fired emergency fire pump to support the expansion

EMISSION SUMMARY

| PM_10 + PM_2.5 | SO_2 | NO_X | CO | VOCs | Ind. HAP^* | Total HAPs

Uncontrolled Potential Emissions (tpy) 
(Pre-Project)

7.18

0.17

16.47

13.08

38.26

12.19

36.74

Potential Emissions from Remove Sources (tpy) | 1.93 | 0.14 | 11.91 | 9.25 | 2.59 | - | 0.19
Potential Emissions from Modification (tpy) | 5.09 | 0.17 | 11.92 | 9.00 | 20.96 | 6.10 | 25.84
Totals (Post-Project) | 10.33 | 0.17 | 16.47 | 12.83 | 56.63 | 18.29 | 62.39
Emission Limitations (tpy) | --- | --- | --- | --- | --- | 9.9 | 24.0
*Maximum facility-wide emissions for an individual HAP are based on “Hydrogen Chloride” pollutant

With the modifications proposed by Southwire in this permitting action, maximum uncontrolled emissions have increased for Particulate Matter under 10 Microns (PM_10 + PM_2.5; PM_10 encompasses PM_2.5), Sulfur Dioxide (SO_2), Nitrogen Oxides (NO_X), Carbon Monoxide (CO), Volatile Organic Compounds (VOCs), individual Hazardous Air Pollutants (HAPs), and total combined HAPs. The facility’s pre-project maximum uncontrolled emissions reflect equipment that has already been removed and recalculations to the emissions for existing operations. The facility’s maximum uncontrolled emissions of individual and combined HAPs would continue to exceed the HAP major source thresholds; however, the facility will continue to take an emission limitation to avoid HAP major status (the facility-wide HAP emission limits were originally established in the SMOP renewal issued January 18, 2011). The facility will not exceed Title V major source thresholds for any pollutant, nor will they exceed PSD major source thresholds for any pollutant. 

APPLICABLE/PROPOSED PERMIT LIMITATIONS

Emission
Point(s)

Applicable Requirement

Pollutant /
Parameter

Limitation / Standard

Compliance Demonstration

AA-000 (Facility-Wide) | 11 Miss. Admin. Code, Pt. 2, R. 2.2.B(10).           (Major Source Avoidance Limits) | HAPs | < 9.9 tpy (Individual)                      < 24.0 tpy (Total)                   (Rolling 12-Month Totals) | Calculate and Record Emissions
AA-001 AA-024 AA-025 | 40 CFR 60.40c and 60.48c(g)(2), Subpart Dc | SO_2 | Monitor the Volume of Fuel Combusted (Monthly) | Submit Report of Fuel Usage
AA-001 AA-002 AA-024 AA-025 | 11 Miss. Admin. Code Pt. 2, R. 2.2.B(10). | | Decommission AA-001 and AA-002 prior to start-up of AA-024 and AA-025 | Report Decommission Date
AA-024 AA-025 | 40 CFR 60.48c(a), Subpart Dc | | Compliance Demonstration Actions (Initial Startup Notification) | Submit Initial Startup Notification

AD-003

40 CFR 60.4205(c), 60.4206, and 60.4211(c), and Table 8, Subpart IIII

NHMC + NO_X
CO
PM

Meet Emission Standards and Install and Configure Engines to Manufacturer Specifications

Keep a maintenance plan and records of conducted maintenance and conduct an initial performance test to demonstrate compliance with the applicable emission standards after each engine is no longer installed, configured, operated, and maintained in accordance

| 40 CFR 60.4211(a), Subpart IIII | | Operate and Maintain Engine According to Manufacturer Specifications |
| 11 Miss. Admin. Code Pt. 2, R. 2.2.B(10). | | Perform Maintenance and Inspection on Engines at Prescribed Times |
| 40 CFR 60.4207(b), Subpart IIII; and 40 CFR 1090.305, ULSD Standards | Fuel Requirement | ≤ 15 ppm sulfur content ≥ 40 cetane index or ≤ 35 vol.% aromatic content | N/A
AD-003 | 40 CFR 60.4211(f)(1) – (3), Subpart IIII | Hours of Operation | Limited to 100 hours of operation for maintenance and readiness checks | Record hours of Operation (Emergency and Non-Emergency)
| 40 CFR 60.4209(a), Subpart IIII; and 11 Miss. Admin. Code Pt. 2, R. 2.2.B(10). | Hours of Operation | Install, Operate, and Maintain a Non-Resettable hour Meter | Record hours of operation (Emergency and Non-Emergency)
AA-008 AA-020 | 11 Miss. Admin. Code Pt. 2, R. 2.2.B(11). | HCl           HCN | Monitor the Quantity of Plastic Material Removed (Monthly) | Report Quantity of Plastic Material Removed
AA-007 AA-013 AA-026 | | HAPs | Monitor the Quantity of Each Material Extruded (Monthly) | Submit Report of Plastic Polymer Material Extruded
AA-027 | | | Record Operational Data for Printing Activities (Monthly) | Report Operational Data for Printing Activities
AA-019 | | | Monitor the Quantity of Each Material Cured (Monthly) | Report Quantity of Material Cured

NSPS APPLICABILITY

40 CFR Part 60, Subpart Dc—Standards of Performance for Small Industrial-Commercial-Institutional Steam Generating Units: Southwire has five (5) existing and proposed natural gas-fired boilers (Emission Points AA-001, AA-002, AA-003, AA-024, and AA-025). Emission Points AA-001, AA-002, AA-024, and AA-025 have rated heat capacities of 10.461 MMBtu / hour, but Emission Point AA-002 was constructed in 1979. Emission Points AA-001, AA-024, and AA-025 were constructed after the applicable date of June 9, 1989, and each have a heat input capacity greater than 10 MMBTU / hour but less than 100 MMBtu / hour. As such, the three (3) boilers making up Emission Points AA-001, AA-024, and AA-025 are subject to and must comply with applicable requirements found in Subpart Dc.

40 CFR Part 60, Subpart Kb—Standards of Performance for Volatile Organic Liquid Storage Vessels (including Petroleum Liquid Storage Vessels) for Which Construction, Reconstruction, or Modification Commenced After July 23, 1984: Southwire operates one (1) 5,500-Gallon Used Drawing Solution (Mineral Oil) Storage Tank (Emission Point AB-008). Based on the specified capacity, the storage tank does not meet the minimum volume threshold of 19,812.9 gallons (or 75 cubic meters) as required by the subpart. Therefore, the tank is not subject to the requirements of Subpart Kb. 

40 CFR 60 Subpart, Subpart IIII—Standards of Performance for Stationary Compression Ignition Internal Combustion Engines: Southwire an emergency fire pump engine (Emission Point AD-003). Emission Point AD-003 is a proposed new 209 HP emergency fire pump compression-ignition engine with a displacement of less than 10 liters per cylinder. The emergency fire pump engine is subject to the requirements of Subpart IIII in order to comply with 40 CFR Part 63, Subpart ZZZZ. 

MACT APPLICABILITY

40 CFR Part 63, Subpart ZZZZ—National Emission Standards for Hazardous Air Pollutants for Stationary Reciprocating Internal Combustion Engines (RICE): Southwire operates one (1) emergency fire pump engine (Emission Point AD-003). Emission Point AD-003 is a proposed new CI RICE. Southwire is considered an area source for HAPs. Because of the listed reasons, Emission Point AD-003 is subject to Subpart ZZZZ. However, compliance with Subpart ZZZZ will be demonstrated through compliance with Subpart IIII.

40 CFR 63, Subpart JJJJJJ—National Emission Standards for Hazardous Air Pollutants for Industrial, Commercial, and Institutional Boilers Area Sources: Southwire operates five (5) natural gas-fired boilers (Emission Points AA-001, AA-002, AA-003, AA-024, and AA-025), the boilers are industrials boilers, and the facility is an area source for HAP emissions. However, given that the noted boilers are considered “gas-fired” meaning it burns gaseous fuels not combined with any solid fuels burns liquid fuel only during certain periods defined in 40 CFR 63.11237 “Gas-fired boiler”, the boilers are not subject to Subpart JJJJJJ. 

40 CFR 63, Subpart XXXXXX—National Emission Standards for Hazardous Air Pollutants Area Source Standards for Nine Metal Fabrication and Finishing Source Categories: Southwire produces copper and aluminum wire. Subpart XXXXXX applies to area sources of HAP that are primarily engaged in one of nine operations. One of these is “Electrical and Electronic Equipment Finishing Operations”; however, Southwire’s SIC code is not listed in EPA’s list of Subpart XXXXXX applicable SIC codes. As such, this subpart does not apply.

PUBLIC PARTICIPATION

The 30-day public notice period began on September 23, 2026, when the notice was posted on MDEQ’s website and ends October 26, 2026.

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