PERMIT RATIONALE FOR REISSUANCE
Ruleville POTW
Sunflower County
Ruleville, Mississippi
Water NPDES No. MS0024945
April 15, 2013

I.	CLASSIFICATION – Municipal NPDES Minor

II.	DESCRIPTION OF WASTEWATER – Municipal Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Ditch thence to Quiver River.  The receiving waters are located within the Yazoo River Basin, and the ditch is classified as Ephemeral. Quiver River does not appear on the current State of Mississippi 303(d) List of Impaired Waterbodies.  Quiver River has a completed TMDL for Organic Enrichment/Low DO.  At the point of discharge the 7Q10 for the receiving stream is 0.0 cfs (Ephemeral). The instream wastewater concentration at the point of discharge can be determined by the following calculation:

IWC = {(Qw)/(Qw + Qr)}*100

	Where, Qw = Design flow of the wastewater treatment facility, 0.8 MGD or 1.24 cfs
		 Qr = Receiving stream 7Q10, 0.0cfs.

IWC = {(1.24cfs)/(1.24 cfs + 0.0 cfs)}*100 = 100 %

IV.	APPLICABLE GUIDELINES – State of Mississippi Wastewater Regulations (WPC-1), State of Mississippi Water Quality Criteria (WPC-2), Wasteload Allocation (WLA), Total Maximum Daily Load (TMDL)

V.	SUMMARY OF LIMITATIONS – 

Parameters		Flow					Basis
	Flow			0.8 MGD				Design
	BOD5			30 mg/l (Monthly Avg.)			WLA
	BOD(% Removal)		65% Minimum			Technology
	TSS			90 mg/l (Monthly Avg.)			Technology
	NH3-N			Report						WLA
	Total Nitrogen			Report 	(Phase I)
				76.78 lbs/day (Phase II)			TMDL
	Total Phosphorus		Report	(Phase I)					
				34.72 lbs/day (Phase II)			TMDL
	pH 			6.0 – 9.0 SU			MSWQS

VI.	CHANGES FROM PREVIOUS PERMIT

1.	The proposed draft permit contains Phase I and Phase II Total Phosphorus requirements. The Phase I requirements are Total Phosphorus monitoring and reporting. The Phase II requirements reflect the limitations proposed in the Wasteload Allocation for the site dated January 7, 2013.

2.	The proposed draft permit contains Phase I and Phase II Total Nitrogen effluent requirements. The Phase I requirements are Total Nitrogen monitoring and reporting. The Phase II limitations reflect the limitations proposed in the Wasteload Allocation for the site dated January 7, 2013.

Upon issuance of this permit, the permittee shall achieve compliance with the effluent limitations specified for the parameters noted as Phase I.  Beginning upon the completion and start-up of the improvements needed to comply with Phase II limitations, but no longer than the expiration date of the permit, the permittee shall achieve compliance with the effluent limitations specified for the parameters noted as Phase II.

The permittee shall submit an engineering report that describes how the facility will come into compliance with the Phase II limitations.