PERMIT RATIONALE FOR REISSUANCE
Ruleville POTW
Sunflower County
Ruleville, Mississippi
Water NPDES No. MS0024945
4/26/2023

I.	CLASSIFICATION – NPDES Municipal Minor

II.	DESCRIPTION OF WASTEWATER – Municipal

III.	DESCRIPTION OF WASTEWATER TREATMENT – Municipal wastewater is collected and treated by two facultative lagoons prior to discharge. Only one discharge to surface waters is described in the application, with no increase in treated effluent flow proposed.

IV.	RECEIVING WATERS – Ditch thence Quiver River.  The receiving waters are located within the Yazoo River Basin. The ditch is classified as Ephemeral and the Quiver River is classified as Fish and Wildlife. At the point of discharge, the receiving waters do not appear on the current State of Mississippi 303(d) List of Impaired Waterbodies. The discharge is listed on a completed Total Maximum Daily Load (TMDL) for Nutrients and Organic Enrichment/Low DO in the Quiver River (June 2008). The permit contains Total Nitrogen and Total Phosphorous limitations prescribed in the TMDL. 

At the point of discharge, the 7Q10 for the receiving stream (ephemeral) is 0.0 cubic feet per second (cfs). The instream wastewater concentration (IWC) at the point of discharge, therefore, is 100%.

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

VI.	SUMMARY OF LIMITATIONS – 

Parameters			   Flow			Basis
	Flow				0.8 MGD			Design
	BOD5				30 mg/l 			Technology
	BOD5 (% Removal)			65% Minimum			Technology
	TSS				90 mg/l 			Technology
	NH3-N				Report			WLA
	Total Nitrogen				76.78 lbs/day 			TMDL
	Total Phosphorus			34.72 lbs/day 			TMDL
	pH 				6.0 – 9.0 SU			Admin Code
	E. coli				Report			WLA and Stream Class

VII.	Changes to Permit

E. coli monitoring was added to the permit.