PERMIT RATIONALE FOR REISSUANCE
4D Grocery and Carwash LLC
Montgomery County
Stewart,, Mississippi
Water NPDES No. MS0055336
October 20, 2025
I.	FACILITY INFORMATION

Facility Name:		4D Grocery and Carwash, LLC
Facility Address:	4517 Highway 82, Stewart, Mississippi 39767
Facility County:	Montgomery
SIC:  			7542

II.	NATURE OF BUSINESS

4D Grocery and Carwash, LLC includes an unmanned carwash operation.
	
III.	TYPE OF WASTEWATER TREATMENT

Vehicle washing wastewater is collected and treated via an oil and water separator and sedimentation trap.

IV.	EFFLUENT AND RECEIVING STREAM FLOW DATA

Effluent discharges through existing Outfall 001 to a ditch, thence into Big Black, located in the Big Black River drainage basin and classified as Fish and Wildlife. Sewer connection is not readily available.

V.	DATA FROM MISSISSIPPI SMALL DOMESTIC NPDES APPLICATION

Application testing waiver was requested and approved.

VI.	TOTAL MAXIMUM DAILY LOAD (TMDL) AND 303(d) LISTINGS

Big Black does not appear on Mississippi’s 2018 Section 303(d) List of Impaired Water Bodies. There are no applicable TMDLs.

VII.	EPA APPLICABLE CATEGORICAL GUIDELINES

None

VIII. 	PROPOSED FINAL LIMITATIONS

Parameter	Current Permit Limit (CPL)	Present Permit Limit (PPL)	Basis	
	Average	Maximum	Average	Maximum		
Flow	-----	0.0005 MGD	-----	0.0005 MGD	Design	
pH	6.0 SU (min)	9.0 SU	6.0 SU (min)	9.0 SU	MSWQS	
Oil and Grease	10 mg/L	15 mg/L	10 mg/L	15 mg/L	1/	
Total Suspended Solids 	30 mg/L	45 mg/L	30 mg/L	45 mg/L	1/	
	MSWQS = Mississippi Water Quality Standards

1/Proposed permit limits for Oil and Grease and Total Suspended Solids are comparable to limits placed in permits held by existing similar commercial car wash facilities in the State of Mississippi.  

Effluent limits have been developed such that the waste treatment system should protect water quality. However, this permit is subject to modification if future evidence, monitoring results, or nuisance conditions indicate a higher degree of treatment is required to maintain water quality in the receiving stream.