PERMIT RATIONALE FOR REISSUANCE
Centreville POTW, South
Wilkinson County
Centreville, Mississippi
Water - NPDES Draft Permit No. MS0025909
May 13, 2013

I.	CLASSIFICATION	- Municipal Minor

II.	DESCRIPTION OF WASTEWATER – Domestic 

III.	DESCRIPTION OF WASTEWATER TREATMENT – Wastewater is biologically treated by means of an aerated lagoon followed by a settling area inside the lagoon cell and sand filtration.  The wastewater is disinfected by chlorination and also is dechlorinated prior to discharge.  The current design capacity of the facility is 0.12 MGD.  

IV.	RECEIVING WATERS – Stafford Creek.  The receiving stream does appear on The State of Mississippi current List of Waterbodies and a TMDL has also been conducted for this receiving stream.  The receiving stream is in the South Independent Streams drainage basin.  Stafford Creek is classified as Fish and Wildlife.     
V.	SUMMARY AND BASIS OF DISCHARGE LIMITATIONS - 
Parameter				Flow					Basis
Flow					0.12 MGD				Design
BOD5					10 mg/l					WLA
BOD (Percent Removal)			85%					Technology
Ammonia Nitrogen			2 mg/l					WLA
Minimum DO				6.0 mg/l				WLA, MSWQS
TSS					30 mg/l					Technology
TSS (Percent Removal)			85%					Technology
Fecal Coliform 
•	Summer			200 col./100 ml 				MSWQS
•	Winter				2000 col./100 ml 			MSWQS
Chlorine, Total Residual	 		0.011 mg/l				MSWQS
pH					6.0 – 9.0 SU				MSWQS