PERMIT RATIONALE FOR REISSUANCE
Moore Enterprises of MS LLC
Marshall County
Byhalia, Mississippi
Water NPDES No. MS0052515
September 2, 2025

I.	NATURE OF BUSINESS

Moore Enterprises of MS LLC operates an unmanned, four bay commercial car wash facility. 

II.	EFFLUENT AND RECEIVING STREAM FLOW DATA

Moore Enterprises discharges 1,000 gallons per day of treated carwash effluent through an existing outfall into Nonconnah Creek which is located in the North Independent drainage basin and classified as Fish and Wildlife. Sewer connection is not readily available.

III.	303(d) and TOTAL MAXIMAL DAILY LOADS (TMDLs) ISSUES

Nonconnah Creek does not appear on Mississippi’s current Section 303(d) List of Impaired Water Bodies. The permit complies with the following TMDLs:

•	Total Maximal Daily Load Nonconnah Creek Wastershed for Biological Impairment Due to Sediment Northern Independent Streams Basin (TMDL ID 305113003; November 2005).
•	Total Maximal Daily Load Biological Impairment Due to Organic Enrichment/ Low Dissolved Oxygen and Nutrients Nonconnah Creek North Independent Basin Marshall County, Mississippi (TMDL ID 306062603; June 2006).

IV.	TYPE OF WASTEWATER TREATMENT

Oil/water separator and sedimentation.

V.	EPA APPLICABLE CATEGORICAL GUIDELINES

None

VII.	DATA FROM MISSISSIPPI SMALL DOMESTIC NPDES APPLICATION

Application testing waiver was requested and approved.

XI.	PROPOSED FINAL LIMITATIONS 

	Outfall 001
Parameter	Current Permit Limit (CPL)	Present Permit Limit (PPL)	Basis	
	Average	Maximum	Average	Maximum		
Flow	-----	0.001 MGD	-----	0.001 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.