PERMIT RATIONALE FOR REISSUANCE
USDA Forest Service, Choctaw Lake Recreation Area
Choctaw County
Ackerman, Mississippi
Water NPDES No. MS0020427
March 2020

I.	CLASSIFICATION – NPDES Commercial

II.	DESCRIPTION OF WASTEWATER – Domestic Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated via a septic tank/sand filter system. No increase in flow is proposed within the application.  

IV.	RECEIVING WATERS – Unnamed Tributary of the Noxubee River.  The receiving water is located within the Tombigbee River Basin and is classified as Fish and Wildlife.  The Noxubee River does not appear on the updated 2018 State of Mississippi 303(d) List of Impaired Waterbodies. The discharge is listed in a completed Total Maximum Daily Load (TMDL) for Nutrients and Organic Enrichment / Low Dissolved Oxygen (DO)(June 2009). As permitted, this facility complies with the existing TMDL.

V.	APPLICABLE GUIDELINES – 11 Miss. Admin. Code Pt. 6, Commercial Facility Guidelines (Technology), Wasteload Allocation (WLA), 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 LIMITATIONS –
Parameter			Flow					Basis
Flow				0.0038 MGD				Design
BOD5				30 mg/l				WLA
TSS				30 mg/l				Technology
E. coli				126 (#Col/100mL)			MS WQS 
pH				6.0 – 9.0 SU				MS WQS
NH3-N				2.0 mg/l			TMDL
Total Nitrogen 			0.36 lbs/day			TMDL
Total Phosphorus 			0.18 lbs/day			TMDL
Chlorine 				0.011 mg/l			MS WQS
Dissolved Oxygen 			6.0 mg/l (Minimum)			WLA