PERMIT RATIONALE FOR REISSUANCE
Byhalia POTW
Marshall County
Byhalia, Mississippi
Water - NPDES Draft No. MS0052477
July 2019

I.	CLASSIFICATION - Municipal Minor
II.	DESCRIPTION OF WASTEWATER – Domestic wastewater generated by the Town of Byhalia
III.	DESCRIPTION OF WASTEWATER TREATMENT – Wastewater is biologically treated by means of a conventional lagoon followed by disinfection via chlorination prior to discharge.  There is no proposed increase in discharge described in the application.
IV.	RECEIVING WATERS – Coldwater River.  The Coldwater River does not appear on The State of Mississippi current 303(d) list.  The facility is listed on the TMDL for this section of the Coldwater River for pathogens. The limitations proposed in this draft permit are consistent with Mississippi water quality standards and the TMDL.   The Coldwater River is in the Yazoo River drainage basin.  The Coldwater River is classified as Fish and Wildlife.  
V.	SUMMARY AND BASIS OF DISCHARGE LIMITATIONS - The following limitations have been developed through empirical modeling:
	Parameter	Proposed Value	Basis	
Flow	0.6 MGD	Design	
BOD5	40 mg/l	WLA	
TSS	90 mg/l	Technology-Based	
E. Coli 	126 Col./100 mL	11 MS Admin Code	
Chlorine, Total Residual	0.27 mg/l	WLA	
pH	6.0 to 9.0 S.U.	11 MS Admin Code	
BOD5, % Removal	65% 	Municipal Guidelines	
WLA = Wasteload Allocation (Wasteload Allocation February 28 2019)