(PN COPY)

PERMIT RATIONALE FOR REISSUANCE 
Airgas Carbonic Inc, Star Plant
Water NPDES No. MS0060542
June 17, 2026
Samar Patel, Water I Branch

I.	FACILITY INFORMATION

Facility Address:  217 Andrew Jackson Circle, Star, MS 39167-0250
            Facility County:    Jones 
	SIC:  		      2813

II.	NATURE OF BUSINESS

Carbon dioxide and dry ice plant.

III.	EFFLUENT AND RECEIVING STREAM FLOW DATA

Domestic wastewater is collected and treated via an Aerobic Treatment Unit.  Effluent is discharged into an unnamed tributary of Steen Creek.  Design flow of treatment plant is 0.0015 MGD.

IV.	TOTAL MAXIMUM DAILY LOAD (TMDL) AND 303(d) ISSUES

The receiving stream, Steen Creek, is not listed on the Mississippi 2024 Section 303(d) List of Waterbodies.  

A Pearl River Basin TMDL for Total Nitrogen and Total Phosphorus for the Pearly River was approved in June of 2009. This discharge is considered a de minimis flow and complies with the Pearl River Nutrient TMDL.

V.	TYPE OF WASTEWATER TREATMENT:

Aerobic Treatment Unit with chlorination.

VI.	EPA APPLICABLE CATEGORICAL GUIDELINES

None.

VII.	PROPOSED FINAL LIMITATIONS 

1.	Average Permit Limitations

Outfall	Parameter	Water Quality Limitation	Present Permit Limitation	Proposed Permit Limitation	Basis	
MS0060542-001	Flow	n/a	0.0015 MGD	0.0015 MGD	Design 	
	BOD	n/a	30 mg/L	30 mg/L	Domestic Guidelines	
	TSS	n/a	30 mg/L	30 mg/L	Technology Based 	
	E.Coli	n/a	n/a	126 Col/100 mL	MS WQS	
	Chlorine	n/a	0.1 to 1.0	0.1 to 1.0	Domestic Guidelines	
	pH	n/a	6 – 9 	6 – 9 	MS WQS	

2.	Maximum Permit Limitations

Outfall	Parameter	Water Quality Limitation	Present Permit Limitation	Proposed Permit Limitation	Basis	
MS0060542-001	Flow	n/a	Report	Report		
	BOD	n/a	45 mg/L	45 mg/L	Domestic Guidelines	
	TSS	n/a	45 mg/L	45 mg/L	Technology Based 	
	E.Coli	n/a	n/a	410 Col/100 mL	MS WQS	

Chlorine and pH shall be monitored once per week by grab sample.
Flow shall be monitored once per week by instantaneous measurement.
BOD shall be monitored once every 6 months by grab sample.
E.coli shall be monitored once every 6 months by grab sample.