PERMIT RATIONALE FOR MODIFICATION
Alcorn State University
Claiborne County
Alcorn State, Mississippi
Water NPDES No. MS0027855
November 2023

I.	CLASSIFICATION – Minor Domestic

II.	DESCRIPTION OF WASTEWATER – Domestic Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated via conventional lagoon that is side-stream to an oxidation ditch activated sludge system, which contains an internal outfall. The flows from the lagoon and the activated sludge facility join prior to disinfection and discharge to the receiving stream. No increase in flow is proposed within the application.

IV.	RECEIVING WATERS – Mammy Judy Bayou. The receiving stream is located within the Southern Independent Streams drainage basin and is classified as Fish and Wildlife. At the point of discharge the receiving stream does not appear on the current State of Mississippi 303(d) List of Impaired Waterbodies.  The discharge is listed in a TMDL for Fecal Coliform, which the facility complies with via disinfection. Only one discharge to surface waters is described within the application with no increase in flow proposed. 

V.	APPLICABLE GUIDELINES – 40 CFR, 11 MS Admin Code pt. 6, Wasteload Allocation (WLA), Instream Waste Concentration (IWC)

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 
Outfall 001

Parameter			Value					Basis
Flow				0.75 MGD				Design
BOD5				10 mg/l (Max Mo. Avg.)		Modeled
TSS				30 mg/l (Max Mo. Avg.)		Technology
Ammonia Nitrogen		2.0 mg/l (Max Mo. Avg.)		WLA
Dissolved Oxygen 		> 6.0 mg/l				Admin Code
E. Coli				126 Col./100 ml			Admin Code
Chlorine, Total Residual	0.011 mg/l 				IWC & Admin Code
pH				6.0 – 9.0 SU				Admin Code

	Outfall 101

Parameter			Value					Basis
Flow				Report  MGD				Design
BOD5				45 mg/l (Max Mo. Avg.)		40 CFR
TSS				90 mg/l (Max Mo. Avg.)		40 CFR
Ammonia Nitrogen		Report mg/l (Max Mo. Avg.)		WLA
pH				6.0 -9.0 SU 				Admin Code