PERMIT RATIONALE FOR REISSUANCE
Pace POTW
Bolivar County
Pace,, Mississippi
Water NPDES No. MS0036544
June 1, 2026

I.	CLASSIFICATION – Municipal NPDES Minor

II.	DESCRIPTION OF WASTEWATER – Municipal Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Municipal wastewater is collected and treated biologically by means of a conventional lagoon followed by disinfection. No increase in flow is proposed within the application. 

IV.	RECEIVING WATERS – Bogue Phalia. At the point of discharge the receiving water does not appear on the updated 2020 State of Mississippi 303(d) List of Impaired Waterbodies. The facility is mentioned in a completed Organic Enrichment, Nutrients, and Sediment TMDL for the Big Sunflower River (June 2008). As permitted the facility will comply with the conditions proposed in the TMDL. The receiving water is located in the Yazoo River drainage basin, and is classified as Fish & Wildlife. 

At the point of discharge the 7Q10 for the receiving stream is 12.57 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, 0.06 MGD or 0.093 cfs
 Qr = Receiving stream 7Q10, 12.57 cfs.

IWC = {(0.093 cfs)/(0.093 cfs + 12.57 cfs)}*100 = 0.73 %

V.	APPLICABLE GUIDELINES – 11 Mississippi Admin Code Pt. 6, State of Mississippi Water Quality Standards (MS WQS), Municipal Facility Guidelines (Technology), Wasteload Allocation (WLA), Total Maximum Daily Load (TMDL)

VI.	CHANGES FROM PREVIOUS PERMIT – E. coli has replaced fecal coliform as the bacterial indicator for all freshwaters in Mississippi designated as Recreation, Fish and Wildlife Support, and/or Public Water supply.

VII.	SUMMARY OF DISCHARGE LIMITATIONS – 
VIII.	
Parameter			Value			Basis
Flow				0.06 MGD			Design
BOD5				30 mg/l (Monthly Average)		WLA
BOD5 (Percent Removal)	65% Minimum			Technology
TSS				90 mg/l (Monthly Average)		Technology
TSS (Percent Removal)	65% Minimum			Technology
E. colli				126 Col./100ml			MS WQS
Chlorine, Total Residual	1 mg/l Maximum			WLA
pH				6.0 – 9.0 S.U.			MS WQS
Ammonia Nitrogen		7 mg/l (Monthly Average)		WLA
Total Nitrogen			5.7 lbs/day			WLA
Total Phosphorus		2.6 lbs/day			WLA

IX.