PERMIT RATIONALE FOR REISSUANCE
Maben POTW
Webster County
Maben, Mississippi
Water NPDES No. MS0020966
May 3, 2017

I.	CLASSIFICATION – Municipal NPDES Minor

II.	DESCRIPTION OF WASTEWATER – Domestic Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated by means of a two cell lagoon followed by sand filtration beds and cascade aeration.  No increase in flow is proposed within the application.  

IV.	RECEIVING WATERS – Unnamed stream thence Pigeon Roost.  The receiving waters are located within the Big Black River Basin and are classified as Fish and Wildlife.  At the point of discharge the receiving stream does not appear on the 2012 State of Mississippi 303(d) list of evaluated or impaired waterbodies.  The 7Q10 of the receiving stream, at the point of discharge, is 0.0 cfs.  Only one discharge to surface waters is described within the application with no increase in flow proposed.  

V.	APPLICABLE GUIDELINES – State of Mississippi Wastewater Regulations, WPC – 1 

VI.	SUMMARY OF LIMITATIONS – 
	Parameters				Value		Basis
	Flow				0.141 MGD		Design
	BOD5				10 mg/l 		Model
	TSS				30 mg/l 		Technology Based
	Dissolved Oxygen			> 6.0 mg/l 		MSWQS
	E. Coli				126 Col./100 ml		MSWQS
	Chlorine, Total Residual 	0.011 mg/l 		MSWQS
	pH				6.0 – 9.0 SU		MSWQS
	Ammonia				2.0 mg/l		Model

E. Coli will now be the bacterial indicator used for all freshwaters in MS designated as Recreation, Fish and Wildlife Support, and /or Public Water supply (replacing the use of fecal coliform).