PERMIT RATIONALE FOR REISSUANCE
Wilco Properties Inc, Sherwood Forest Subdivision
Lowndes County
Columbus, Mississippi
Water NPDES No. MS0036587
May 5, 2017

I.	CLASSIFICATION – Domestic NPDES

II.	DESCRIPTION OF WASTEWATER – Minor Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated via an aerated lagoon. 

IV.	RECEIVING WATERS – Unnamed Creek thence to Black Creek thence to Luxapallila Creek.  The discharge does not appear on the current State of Mississippi 303(d) List of Impaired Waterbodies. The waterbodies are in the Tombigbee River drainage basin. The Unnamed Creek and Black Creek are classified as Fish and Wildlife, but Luxapallila Creek is listed as Public Water Supply.  This discharge should not cause any impairment to the public water supply due to the discharge being domestic in nature, the facility utilizing disinfection, and the distance from the actual discharge to Luxapallila Creek.

V.	APPLICABLE GUIDELINES – State of Mississippi Wastewater Regulations (11 MS admin code part 6), State of Mississippi Water Quality Criteria (11 MS admin code part 6), Wasteload Allocation Commercial Facility Guidelines

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 

Parameter				Value			Basis
Flow					0.106 MGD			Design
BOD					Report (Phase I)	
					5 mg/l (Phase II)			WLA

TSS					60 mg/l			Commercial Guidelines
Ammonia Nitrogen			Report (Phase I)	
					1 mg/l (Phase II)			WLA

Minimum D.O.				6 mg/l (Phase II)			WLA
Chlorine				0.018 mg/l (Phase II)			WLA
E. Coli					126 Col./100 ml			Commercial Guidelines
pH					6.0 – 9.0 S.U. 			MSWQS

VII.	CHANGES FROM PREVIOUS PERMIT – 

The proposed draft permit contains Phase I and Phase II BOD5 requirements. The Phase I requirements are BOD5 is based on the pervious permitted condition.  The Phase II requirements reflect the limitation proposed in the Wasteload Allocation for the site dated March 31, 2017.

The proposed draft permit contains Phase I and Phase II Ammonia Nitrogen effluent requirements. The Phase I requirements are effluent Ammonia Nitrogen is based on the previous permitted condition.  The Phase II requirements reflect the limitation proposed in the Wasteload Allocation for the site dated March 31, 2017.

E. Coli will now be the bacterial indicator used for all freshwaters in MS designated as Recreation, Fish and Wildlife Support, and /or Public Water supply (replacing the use of fecal coliform).

Upon issuance of this permit, the permittee shall achieve compliance with the effluent limitations specified for the parameters noted as Phase I.  Beginning upon completion and start-up of improvements needed to comply with Phase II limitations, or by three (3) after the effective date of the permit, the permittee shall achieve compliance with the effluent limitations specified for the parameters 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.

All previously permitted parameters have remained the same in the reissuance.