PERMIT RATIONALE FOR REISSUANCE
US Army COE, Arkabutla North Abutment Recreation Area
Desoto County
Coldwater, Mississippi
Water NPDES No. MS0020656
October 10, 2025

I.	CLASSIFICATION – NPDES Commercial

II.	DESCRIPTION OF WASTEWATER – Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated biologically via an activated sludge plant followed by chlorine disinfection prior to discharge. Only one discharge to surface waters is described within the application with no increase in treated effluent flow proposed. 

IV.	RECEIVING WATERS – Coldwater River. The receiving waters are located in the Yazoo River drainage basin and are 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 does appear on a completed Total Maximum Daily Load (TMDL) for Organic Enrichment/Low Dissolved Oxygen and Nutrients in the Coldwater River (June 2003). The TMDL does not require reductions to the currently permitted limits.

V.	APPLICABLE GUIDELINES – 11 Mississippi Admin Code pt. 6, Commercial Facility Guidelines (Technology), State of Mississippi Water Quality Criteria (MSWQS)

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 

	Parameter		Value			Basis
	Flow			0.02 MGD		Design
	BOD			30 mg/l 			Technology
	TSS 			30 mg/l 			Technology
	E. coli			126 Col./100mL 		MSWQS
	pH			6.0 to 9.0 S.U.		MSWQS
	Chlorine			0.1 to 1.0 mg/l		Technology

Minimum and maximum values for influent pH, dissolved oxygen in the aeration basin, and 30-miunte sludge settleability in the aeration basin must also be reported. 
	
VII.	CHANGES FROM PREVIOUS PERMIT – 

None