PERMIT REVIEW SUMMARY

Permit Writer:	Jeffrey Bland 	Date:	August 1, 2025

Company Name:	Gulf South Pipeline Company LLC, Hinds Compressor Station

Facility Location:	Belknap Road, Edwards, MS  39066

Source Number:	1080-00274

County: 		Hinds

FACILITY DESCRIPTION

Gulf South Pipeline Company LLC proposes to construct the new Hinds Compressor Station south of Edwards, Mississippi, for the purpose of transporting natural gas through its pipeline distribution system. At the compressor station, waste oil, water, and condensate liquids (from routine maintenance operations) will be loaded, as necessary, onto trucks for disposal. There will be one small catalytic heater and two (2) 1,170-gallon-each liquid storage tanks for purposes of maintenance activities and one (1) emergency backup generator engine. Gas will be compressed using one (1) compressor turbine. The station will also have facility blowdowns and fugitive emissions. The following table includes the emission points at the facility. 

Emission Point	Description	
AA-001a	31,809 HP Titan Model No. T250 simple-cycle natural gas-fired compressor turbine at ISO conditions and 27,677 HP at NEMA conditions (33,589 HP and 210.86 MMBTU/hr at site conditions) equipped with SoLoNOx system.	
AA-001b	Centrifugal compressor driven by Emission Point AA-001a	
AA-002	1,589 HP Power Systems Inc Model 53LTCAC Spark Ignition (SI) natural gas-fired emergency backup power generating engine	
AA-003	Fugitive emissions from equipment leaks	
AA-004	1,170-Gallon Condensate storage tank (ST-1)	
AA-005	1,170-Gallon Oily wastewater storage tank (ST-2)	
AA-006	Truck loading	
AA-007	2.07 MMBTUH Catalytic heater	
AA-008	Process controllers	

PROJECT/PERMIT ACTION DESCRIPTION

The facility is classified as a True minor source with respect to Title V of the Federal Clean Air Act. The facility has the uncontrolled potential to emit less than 100 tons per year (tpy) of all criteria pollutants and less than 25 tpy of combined hazardous air pollutants (HAPs), as well as less than 10 tpy of each individual HAP.

EMISSION SUMMARY

Facility-Wide Potential-to-Emit Summary1
Pollutant	PTE Emissions (tons/yr)	
Particulate Matter (TSP)	0.15	
PM10	0.31	
PM2.5	0.20	
Sulfur Dioxide (SO2)	0.45	
Nitrogen Oxides (NOx)	34.06	
Carbon Monoxide (CO)	43.88	
Volatile Organic Compounds (VOC)	4.22	
Formaldehyde	2.40	
Total HAP 	2.67	
1 The PTE emissions reflect any emission limits or enforceable restrictions included in the proposed permit.

APPLICABLE/PROPOSED PERMIT LIMITATIONS

The compressor turbine (Emission Point AA-001) is limited to 0.060 lb SO2 /MMBTU (20 grains S/100scf and 25 ppm at 15% O2 or 150 ng/J of useful output (1.2 lb/MWh)s in order to comply with 40 CFR 60, Subpart KKKK emission limitations. The facility is required to conduct performance stack testing for NOx and maintain fuel sulfur content records.

NSPS APPLICABILITY

40 CFR 60 Subpart IIII
The provisions of 40 CFR 60 Subpart IIII - New Source Performance Standards for Compression Ignition Internal Combustion Engines (NSPS IIII) are applicable to stationary compression ignition internal combustion engines that commenced construction, modification, or reconstruction after April 1, 2006.  The compressor station’s emergency engine is a spark ignition engine and not a compression ignition internal combustion engine, therefore, the compressor station’s emergency engine is not subject to any requirements of NSPS IIII.  

40 CFR 60 Subpart JJJJ
The provisions of 40 CFR 60 Subpart JJJJ - New Source Performance Standards for Stationary Spark Ignition Internal Combustion Engines (NSPS JJJJ) are applicable to stationary spark ignition internal combustion engines that commenced construction, modification, or reconstruction after June 12, 2006.  The emergency generator engine (Emission Point AA-002) has a 2024 manufacture date. To demonstrate compliance with the emission standards in NSPS Subpart JJJJ, the facility will purchase a certified engine for Emission Point AA-002.

40 CFR 60 Subpart KKK
The provisions of 40 CFR 60, Subpart KKK - Standards of Performance for Equipment Leaks of VOC from Onshore Natural Gas Processing Plants (NSPS KKK) apply to affected facilities in onshore natural gas processing plants that commences construction, reconstruction, or modification after January 20, 1984, and on or before August 23, 2011.  Since the Hinds Compressor Station is not located at an onshore natural gas processing plant, as defined in 40 CFR 60.631, the Hinds Compressor Station is not subject to NSPS KKK.

40 CFR 60 Subpart KKKK
The provisions of 40 CFR 60, Subpart KKK - Standards of Performance for Stationary Combustion Turbines establishes emission standards and compliance schedules for the control of emissions from stationary combustion turbines that commenced construction, modification or reconstruction after February 18, 2005. Emission Point AA-001a is a 31,809 HP Titan Model No. T250 simple-cycle natural gas-fired compressor turbine at International Standards Organization (ISO) conditions and 27,677 HP at National Electrical Manufacturers Association (NEMA) conditions (33,589 HP and 210.86 MMBTU/hr at site conditions) equipped with SoLoNOx system.  The turbine will have a 2025 or 2026 manufacture date.  Therefore, Emission Point AA-001a is limited to 0.060 lb SO2 /MMBTU (20 grains S/100scf and 25 ppm at 15% O2 or 150 ng/J of useful output (1.2 lb/MWh)s in order to comply with 40 CFR 60, Subpart KKKK emission limitations. The facility will be required to conduct performance stack testing for NOx and maintain fuel sulfur content records.

40 CFR 60 Subpart OOOO
The provisions of 40 CFR 60, Subpart OOOO - Standards of Performance for Crude Oil and Natural Gas Facilities for Which Construction, Modification, or Reconstruction Commenced After August 23, 2011, and on or Before September 18, 2015 (NSPS OOOO) are potentially applicable to owners and operators of onshore affected facilities that commence construction, modification, or reconstruction between August 23, 2011, and September 18, 2015.  Since the facility’s construction date is after September 18, 2015, no sources at the compressor station are subject to any requirements of NSPS OOOO.

40 CFR 60 Subpart OOOOa
The provisions of 40 CFR 60, Subpart OOOOa - Standards of Performance for Crude Oil and Natural Gas Facilities for which Construction, Modification or Reconstruction Commenced After September 18, 2015, and On or Before December 6, 2022 (NSPS OOOOa) are potentially applicable to new and modified sources in the oil and gas industry between August 18, 2015, and December 6, 2022.  Since the facility’s construction date is after December 6, 2022, no sources at the compressor station are subject to any requirements of NSPS OOOOa.

40 CFR 60 Subpart OOOOb
The provisions of 40 CFR 60, Subpart OOOOb - Standards of Performance for Crude Oil and Natural Gas Facilities for Which Construction, Modification or Reconstruction Commenced After December 6, 2022 (NSPS OOOOb) are potentially applicable to new and modified sources in the oil and gas industry after December 6, 2022. 

The date of construction and installation of the compressor is after December 6, 2022; therefore, the turbine’s centrifugal compressor, process controllers, and fugitive emission components are subject to the requirements of Subpart OOOOb.  

The storage vessels at the site will only be used to capture liquids during maintenance activities and will be used for any purposes of a storage vessel defined in 40 CFR 60.5430b; therefore, the storage vessels are not subject to NSPS OOOOb.

40 CFR 60 Subpart Kc
The provisions of 40 CFR 60, Subpart Kc - Standards of Performance for Volatile Organic Liquid Storage Vessels (Including Petroleum Liquid Storage Vessels) for Which Construction, Reconstruction, or Modification Commenced After October 4, 2023, are standards applicable to vessels used for storing volatile organic liquids.  The facility’s maintenance liquids storage tanks are each below 20,000 gallons; therefore, the facility’s maintenance liquids storage tanks are not subject to NSPS Kc.

MACT APPLICABILITY

NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS (NESHAP) APPLICABILITY
The facility is an area source of Hazardous Air Pollutants (HAP) since the facility does not have the potential to emit more than 25 tons per year of total HAPs or 10 tpy of any individual HAP.

40 CFR 63 Subpart ZZZZ - National Emissions Standards for Hazardous Air Pollutants for Stationary Reciprocating Internal Combustion Engines
The Reciprocating Internal Combustion Engines (RICE) NESHAP, Subpart ZZZZ, regulates HAP emissions from RICE.

Emission Point AA-002 is considered a new, spark ignition, 4-stroke lean-burn, emergency engine with a site rating greater than 500 HP that is located at an area source of HAP emissions. As such, the engine must meet the requirements of Subpart ZZZZ by meeting the requirements of 40 CFR 60, subpart JJJJ, for spark ignition engines. No further requirements apply for such engines under 40 CFR 63 Subpart ZZZZ or the General Provisions of Subpart A.

40 CFR 63 Subpart JJJJJJ - National Emission Standards for Hazardous Air Pollutants for Industrial, Commercial, and Institutional Boilers Area Sources
Since the Compressor Station is an “Area” source of Hazardous Air Pollutant (HAP) emissions, the facility is potentially subject to 40 CFR 63, Subpart JJJJJJ However, since the Compressor Station does not operate any boilers, none of the facility’s combustion sources are subject to Subpart JJJJJJ or to any requirements in Subpart JJJJJJ.

40 CFR 63 Subpart HHH - National Emission Standards for Hazardous Air Pollutants From Oil and Natural Gas Production Facilities
NESHAP HHH does not apply to this facility because it is not a major source of HAPs, and there are no glycol dehydration units at the facility. 

PUBLIC PARTICIPATION

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

RECOMMENDATION

The staff has preliminarily decided to recommend issuance of the permit to the Mississippi Environmental Quality Permit Board as shown in the draft permit.  However, the staff recommendation to the Board will be made only after a thorough consideration of all public comments.