PERMIT RATIONALE FOR REISSUANCE
Mississippi Department of Corrections, Quitman County Residential Treatment Facility
Quitman County
Lambert, Mississippi
Water NPDES No. MS0043281
June 2018

I.	CLASSIFICATION – NPDES Commercial

II.	DESCRIPTION OF WASTEWATER – Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated through a septic tank/rock reed system followed by chlorine disinfection prior to discharge. Only one discharge to surface waters is described within the application with no increase in treated effluent flow proposed.

IV.	RECEIVING WATERS – Unnamed Tributary of Muddy Bayou thence Opossum Bayou. The receiving water is in the Yazoo River drainage basin and is classified as Fish and Wildlife.  At the point of discharge, the receiving water does not appear on the current State of Mississippi 303(d) List of Impaired Waterbodies. The discharge does appear on a completed Total Maximum Daily Load (TMDL) for Organic Enrichment/Low Dissolved Oxygen in the Tallahatchie and Yazoo Rivers (May 2008). The TMDL does not prescribe any reduction to current permit limits. The discharge also appears on a TMDL for Total Nitrogen and Total Phosphorus in Opossum Bayou (June 2008). The draft permit contains Nitrogen and Phosphorus limitations prescribed in the TMDL.

V.	APPLICABLE GUIDELINES – 11 Mississippi Admin Code pt. 6, Commercial Facility Guidelines (Technology), Wasteload Allocation (WLA), TMDL

VI.	SUMMARY OF LIMITATIONS – 

Parameter				Value				Basis
Flow					0.001 MGD			Design
BOD5					30 mg/l 			Technology
Ammonia Nitrogen (Phase I)		Report mg/l			WLA	
Ammonia Nitrogen (Phase II)		3 mg/l				WLA
TSS					30 mg/l 			Technology
E. coli					126 Col./100mL 		Admin Code
pH					6.0 to 9.0 S.U.			Admin Code
Chlorine				0.011 mg/l			WLA
Dissolved Oxygen (Phase I)		Report minimum mg/l		WLA
Dissolved Oxygen (Phase II)		6.0 minimum mg/l		WLA
Nitrogen, Total (Phase I)		Report lbs/day			WLA
Nitrogen, Total (Phase II)		0.01 lbs/day			TMDL
Phosphorus, Total (Phase I)		Report lbs/day			WLA
Phosphorus, Total (Phase II)		0.043 lbs/day			TMDL

VII.	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. 

Total Residual Chlorine limits have been included in the draft permit based on the WLA dated June 25, 2018 for the discharge.

Ammonia Nitrogen limits have been included in the draft permit based on the WLA dated June 25, 2018 for the discharge.

Minimum Dissolved Oxygen limits have been included in the draft permit based on the WLA dated June 25, 2018 for the discharge.

Total Nitrogen limits have been included in the draft permit in accordance with the TMDL for Total Nitrogen and Total Phosphorus in Opossum Bayou (June 2008).

Total Phosphorus limits have been included in the draft permit in accordance with the TMDL for Total Nitrogen and Total Phosphorus in Opossum Bayou (June 2008).

Upon issuance of this permit, the permittee shall achieve compliance with the effluent limitations specified for the parameters noted as Phase I; Phase II limitations shall not apply at this time.
Beginning upon completion and start-up of improvements needed to comply with Phase II limitations or five (5) years after the issuance of the permit, whichever comes first, the permittee shall achieve compliance with the effluent limitations specified for the parameters noted as Phase II; Phase I limitations shall not apply at this time. The permittee shall notify our office orally at least 48 hours prior to start-up and in writing no later than 5 days after start-up.