PERMIT RATIONALE FOR REISSUANCE
Adams County WWTF
Adams County
Natchez, Mississippi
Water NPDES No. MS0000213
May 2024

I.	CLASSIFICATION – Industrial Minor

II.	DESCRIPTION OF WASTEWATER – Industrial Leachate and Stormwater

III.	RECEIVING WATERS – Mississippi River. The receiving stream does not appear on the 303(d) List of Impaired Water Bodies, nor is the discharge listed on an established TMDL. The facility is an existing source and expansion was not applied for or indicated in the permit application.  

IV.	APPLICABLE GUIDELINES – 11 Mississippi Admin Code pt. 6, Discharge Monitoring Report (DMR) Calculations

V.	SUMMARY AND BASIS OF DISCHARGE LIMITATIONS

		Parameter		Value			Basis
Flow			Report			Design 
BOD5			6.0 mg/l		Calculations		 
TSS			12.0 mg/l		Calculations
Pentachlorophenol	Report			Previous Permit
Trichlorophenol		Report			Previous Permit

VI.	CALCULATIONS
						
Discharge Events
(Mo. Avg)	 	FLOW (MGD)	BOD
(Lbs/d)	TSS 
(Lbs/d)	Trichlorophenol(mg/L)	Pentacholorophenol (mg/L)	
1/31/2016	 	2.4	120	120	0	0	
6/30/2016	 	6.05	302	302	0	0	
6/30/2017	 	8.0	303	303	0	0	
Avg. Flow (MGD)	 	5.48				
						
Parameters:	Loading (lb/day)	Concentration (mg/L)				
BOD 90%	327	5.0				
TSS  90%	327	5.0				

All DMR values reported from discharge events since previous issuance have confirmed that the limitations contained within the permit are valid. No changes to permit limitations are included in this proposed draft permit.