PERMIT REVIEW SUMMARY

Permit Writer:	Clinton Gentry 				Date:	May 14, 2025

Company Name:	Tinsley Resources LLC, 
Mayersville Crude Oil Gathering Facility

Facility Location:	Highway 1 South, Tank Farm Road
			Mayersville, MS (39713)

			32° 52’ 27.13” N
			91° 03’ 9.82” W

Source Number:	1220-00007

County: 		Issaquena

FACILITY DESCRIPTION

Tinsley Resources LLC. (Tinsley) is a crude oil receiving facility classified under SIC 1311 (Crude Petroleum and Natural Gas). The facility’s primary function is the intake of crude oil via pipeline, barge, or tanker truck to be stored onsite until it is sold and transferred offsite via marine barge or pipeline. 

The facility has the following existing emission points:

Emission
Point	Description	
AA-001	80,000 bbl (3,354,060 gallon) Internal Floating Roof Crude Oil Storage Tank	
AA-002	Marine Loading/Unloading controlled by Flare	
AA-002FL	Marine Loading Flare to control VOC and HAP Emissions	
AA-003	Fugitive Emissions from Loading/Unloading	
AA-004 	80,000 bbl (3,354,060 gallon) External Floating Roof Crude Oil Storage Tank	

PROJECT/PERMIT ACTION DESCRIPTION

Tinsley has applied for a reissuance of the Synthetic Minor Operating Permit (SMOP) that was issued July 2020 and is set to expire June 2025. The facility is not requesting any modifications with the reissuance of the operating permit. 

EMISSION SUMMARY

Pollutant	Facility Uncontrolled Emissions 	Facility Controlled Emissions 	Title V Threshold	Exceed Title V Threshold (Yes/No)?	
PM10/ PM2.5	0.00	0.00	100	No	
SO2	0.00	0.00	100	No	
NOx	0.00	1.23	100	No	
CO	0.00	6.69	100	No	
VOC	158.10	8.46	100	Yes	
Total HAP	0.00	0.00	25	No	
Individual HAP	0.00	0.00	10	No	
*All emissions are expressed in units of tons per year (tpy)

As shown in the table above, Tinsley has the capability to exceed the Title V threshold for Volatile Organic Compounds (VOCs). In order to be classified as a synthetic minor source, Tinsley has elected to take a federally enforceable limitation requiring that all emissions from marine loading/unloading be vented to the flare for destruction. 

No new limitations will be required with the reissuance of the permit.

NSPS APPLICABILITY

40 CFR 60, Subpart K – Standards of Performance for Storage Vessels for Petroleum Liquids for Which Construction, Reconstruction, or Modification Commenced After June 11, 1973, and Prior to May 19, 1978.
This subpart establishes emissions limitations for storage vessels for petroleum liquids. Emission Points AA-001 and AA-004 were both construction prior to June 11, 1973 and as such, are not subject to this subpart.

MACT APPLICABILITY

40 CFR 63 Subpart Y - National Emission Standards for Marine Tank Vessel Loading Operations 
This subpart establishes emissions limitations for new and existing marine tank vessel loading operations located at a major source of HAP emissions. As such, this facility is potentially subject to this subpart. However, due to the facility being considered an existing source and having a synthetic minor limitation that keeps HAP emissions well below the Title V threshold, this facility is not subject to this subpart.  

The facility was previously believed to have been subject to this subpart. However, upon further investigation into the regulations, it was discovered the site should not have been subject to this subpart. As such, it has been removed with this permitting action.

PUBLIC PARTICIPATION

The 30-day public notice period began on May 21, 2025, when the notice was posted on MDEQ’s website and ends June 20, 2025.

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.