PERMIT RATIONALE FOR ISSUANCE OF STATE OPERATING PERMIT 
MGC Terminal LLC
June 26, 2024 
I.	FACILITY INFORMATION

Facility Name:  MGC Terminal LLC
Facility Address:  101 65th Avenue, Meridian, MS  39307    
Lauderdale County 
Water No Discharge State Operating Permit No. MSU223009n, 
Standard Industrial Classification (SIC) Code:  5171
Permit Writer:  Deanna Rush 
EPD Branch:  Water I 

II.	NATURE OF BUSINESS

MGC Terminal, LLC (MGC) stores and transfers refined petroleum products including diesel fuel, gasoline, and ethanol into tanker trucks for distribution to the commercial fuel market. Pipes carry refined petroleum products to tanks for storage and to loading racks for loading into tanker trucks. Ethanol and additives are mixed with gasoline at the loading racks. 

III.	NO DISCHARGE PERMITTING ACTION 

MGC applied for a State Operating Permit (with no-discharge) for operations of an evaporation system. In addition, the permittee submitted an Evaporation Plan (March 4, 2024) that describes the evaporation system.  

IV.	TYPE OF WASTEWATER TREATMENT:

MGC uses oil water separators to separate oil from wastewater (generated at truck loading racks) and sends the separated wastewater to the evaporation tank. The evaporation tank is black to aid in evaporation.  The tank contains a sprinkler system with which wastewater is sprayed inside the tank walls. Maximum operation of the evaporation tank occurs May through September. 

VII.	DATA FROM APPLICATION (Form 2S) 

Parameter	Maximum Daily Value	
Biochemical Oxygen Demand (BOD) 	405 mg/L	
Chemical Oxygen Demand (COD)	9,120 mg/L 	
Total Suspended Solids (TSS) 	60 mg/L	
Ammonia (as N) 	38.1 mg/L 	
Temperature 	21.0 ℃	
pH 	7.2 s.su. 	
Oil and Grease 	15.4 mg/L 	
Benzene 	0.141 mg/L 	
Ethylbenzene 	0.044 mg/L 	
Toluene 	0.974 mg/L 	
Naphthalene 	0.00651 mg/L