PERMIT RATIONALE FOR REISSUANCE
Crawford POTW
Lowndes County
Crawford, Mississippi
Water NPDES No. MS0039560
July 1, 2024

I.	CLASSIFICATION –Municipal NPDES Minor 

II.	DESCRIPTION OF WASTEWATER – Domestic / Municipal Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Wastewater is collected and treated by means of a lagoon, followed by fixed film effluent polishing, followed by Chlorination/ Dechlorination, and finally post aeration disinfection.  No increase in flow is proposed within the application.  

IV.	RECEIVING WATERS – Wet Water Creek thence Noxubee River. Wet Water Creek does appear on the current 303(d) List of Impaired Waterbodies for aquatic life support due to biological impairment. Noxubee River does not appear in the current 303(d) List of Impaired Waterbodies in Lowndes County.  This waterbody is in the Tombigbee River drainage basin. Wet Water Creek is classified as Fish and Wildlife. The discharge is listed in a draft Nutrient, Organic Enrichment, and Low Dissolved Oxygen TMDL for Noxubee River, the permit as written complies with the conditions of the TMDL.

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, 0.0 cfs.

IWC = {(0.093 cfs)/(0.093 cfs + 0.0 cfs)}*100 = 100 %

V.	APPLICABLE GUIDELINES – 11 MS admin code part 6,  Municipal Facility Guidelines, Wasteload Allocation (WLA)

VI.	SUMMARY OF LIMITATIONS –
Parameter			Value					Basis
Flow				0.06 MGD				Design
BOD				11 mg/l (May-Oct.)			WLA
				15 mg/l (Nov.-Apr.)			WLA
TSS				30 mg/l 			Municipal Guidelines
E. Coli				126 Col./100mL		11 MS admin code part 6
pH				6.0 to 9.0 S.U.			11 MS admin code part 6
Chlorine			0.011 mg/L				WLA
Ammonia Nitrogen (Phase I)	2 mg/L 					WLA
Ammonia Nitrogen (Phase II)	1.37 mg/L 				WLA
Dissolved Oxygen		>6.0 mg/L 				WLA
Total Nitrogen 			 5.750 lbs/day				TMDL
Total Phosphorus 		 2.910 lbs/day				TMDL

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 completions and start-up of the improvements needed to comply with Phase II limitations, three (3) years after the permit effective date, the permittee shall achieve compliance with the effluent limitations specified for the parameter 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.