PERMIT RATIONALE FOR REISSUANCE
Doddsville POTW
Sunflower County
Doddsville, Mississippi
Water NPDES No. MS0044458
November 2023

I.	FACILITY INFORMATION

Facility Name:  Doddsville POTW
Facility Address:  3079 Highway 49 
 Doddsville, MS  38736    
Doddsville, 
Permit No.:  MS0044458
SIC:  4952
Permit Writer:  Christiana Boren
EPD Branch:  Municipal and Private Facilities

II.	CLASSIFICATION – NPDES Minor Municipal

III.	DESCRIPTION OF WASTEWATER – Municipal Wastewater

IV.	DESCRIPTION OF WASTEWATER TREATMENT – Municipal wastewater is collected and treated via a 2-cell lagoon followed by chlorine disinfection prior to discharge. Only one discharge to surface waters is described in the application with no increase in treated effluent flow proposed. 

V.	RECEIVING WATERS – Big Sunflower 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 waters do appear on the current State of Mississippi 303(d) List of Impaired Waterbodies. The discharge is included on a completed Total Maximum Daily Load (TMDL) for Pathogens in the Big Sunflower River (October 2002). The facility utilizes chlorine disinfection, which complies with the conditions of the TMDL. The discharge also appears on a completed TMDL for Organic Enrichment, Nutrients, and Sediment in the Big Sunflower River (June 2003). No permit limitations or reductions are prescribed in the TMDL.

At the point of discharge, the 7Q10 for the receiving stream is 30.0 cfs.  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, 0.05 MGD or 0.08 cfs
		 Qr = Receiving stream 7Q10, 30.0 cfs.

IWC = {(0.08 cfs)/(0.08 cfs + 30.0 cfs)}*100 = 0.26 %

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

VII.	CHANGES FROM PREVIOUS PERMIT – 

VIII.	SUMMARY OF LIMITATIONS – 

Parameter			Flow				Basis
Flow				0.05 MGD			Design
BOD5				30 mg/l 			WLA
Minimum DO			6 mg/l				WLA
TSS				90 mg/l 			Technology
E. coli				126 col/100 ml		Admin Code	
Chlorine, Total Residual	< 1.0 mg/l 			Admin Code
pH				6.0 – 9.0 SU			Admin Code
Total Nitrogen			Report lbs/day			WLA
Total Phosphorus		Report lbs/day			WLA