PERMIT RATIONALE FOR REISSUANCE
Walnut POTW
Tippah County
Walnut, Mississippi
Water NPDES No. MS0025925
February 12, 2018

I.	CLASSIFICATION –Municipal NPDES Minor 

II.	DESCRIPTION OF WASTEWATER – Municipal Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Municipal wastewater is collected and treated by means of a lagoon which operates as a Hydrological Controlled Release.  No increase in flow is proposed within the application. 

IV.	RECEIVING WATERS – Muddy Creek.  The receiving water is located within the Northern Independent Stream Basin and is classified as Fish and Wildlife.  Muddy Creek does not appear on the updated State of Mississippi 303(d) list impaired waterbodies. A completed TMDL is pending approval for Nutrients and Organic Enrichment/ Low do. Another TMDL has been finalized for pathogens. The TMDL does not prescribe any further limitations on the facility. 

V.	APPLICABLE GUIDELINES – 11 Mississippi Admin. Code pt. 6 (Admin. Code), Wasteload Allocation (WLA), and Municipal Facility Guidelines (Technology).

VI.	SUMMARY OF LIMITATIONS –
Parameter		Value					Basis
Flow			0.18 MGD 				Design
BOD			30 mg/l 				WLA				
Ammonia		15 mg/l 				WLA		
TSS			90 mg/l 				Admin. Code
pH			6.0 to 9.0 S.U.				Admin. Code

Effluent shall not be discharged to the receiving stream when the stream flow is less than ten (10) CFS.  (Note: 10 CFS = 6.46 MGD) 
WLA limits are based on regulations for HCR discharges.
All previously permitted parameters have remained the same in the reissuance.