PERMIT RATIONALE FOR REISSUANCE
Raleigh POTW
Smith County
Raleigh, Mississippi
Water NPDES No. MS0036331
January 2022

I.	CLASSIFICATION – NPDES Municipal Minor 

II.	DESCRIPTION OF WASTEWATER – Municipal Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Wastewater is collected and treated by means of a hydrographically controlled release (HCR) lagoon.  A conventional lagoon cell is followed by holding cell. The facility is only permitted to discharge when the receiving stream is at or above 10 cfs (6.45 MGD). The facility’s maximum allowable discharge is 1.62 MGD. No increase in flow is proposed within the application.  

IV.	RECEIVING WATERS – Oakahay Creek.  The receiving water is located within the Pascagoula Stream Basin and is classified as Fish and Wildlife.  At the point of discharge, the receiving stream does not appear on the 2020 State of Mississippi 303(d) list impaired waterbodies. The discharge is listed in a completed Total Maximum Daily Load (TMDL) for Organic Enrichment/Low DO and Nutrients in Oakahay Creek (June 2005) and a TMDL for Pathogens in the Leaf River (May 2005). The wasteload allocation and permitted limitations are based on and comply with the TMDLs.

V.	APPLICABLE GUIDELINES – 11 MS Admin Code pt. 6, Wasteload Allocation (WLA), Total Maximum Daily Load (TMDL), Mississippi Water Quality Standards (MSWQS), Municipal Facility Guidelines (Technology)

VI.	SUMMARY OF LIMITATIONS –

Parameter			Value					Basis
Flow				0.2 mg/l (Max Monthly Average)	Design
BOD5				
•	Concentration		30 mg/l (Max Monthly Average)	WLA, TMDL
•	Mass			50.0 lbs/day (Max Monthly Average)	WLA, TMDL
•	Percent Removal	65% Minimum				Technology
TSS				
•	Concentration		90 mg/l (Max Monthly Average)	Technology
•	Mass			150.0 lbs/day (Max Monthly Average)	Technology
•	Percent Removal	65% Minimum				Technology
pH				6.0 – 9.0 SU				MSWQS
Dissolved Oxygen		6.0 mg/l Minimum			WLA, TMDL
Phosphorus, Total 		
•	Concentration		Report mg/l (Max Monthly Average)	TMDL
•	Mass			2.6 lbs/day (Max Monthly Average)	TMDL
Nitrogen, Total			
•	Concentration		Report mg/l (Max Monthly Average)	TMDL
•	Mass			Report lbs/day (Max Monthly Average)	TMDL
E. coli				126 col/100 ml				MSWQS, TMDL
Chlorine, Total Residual	0.366 mg/l				MSWQS, WLA

VII. 	CHANGES FROM PREVIOUS PERMIT - 

E. coli has replaced fecal coliform as the bacterial indicator for all freshwaters in Mississippi designated as Recreation, Fish and Wildlife Support, and/or Public Water supply.