PERMIT RATIONALE FOR ISSUANCE
Wilco Properties Inc, Avalon Subdivision
Lowndes County
Columbus, Mississippi
Water NPDES No. MS0061018
August 28, 2017

I.	CLASSIFICATION – Domestic NPDES

II.	DESCRIPTION OF WASTEWATER – Minor Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater will be collected and treated via an aerated lagoon followed by chlorine disinfection. The system will have a design capacity of 35,000 gpd.

IV.	RECEIVING WATERS – Vernon Branch. Vernon Branch does not appear on the current 303(d) List of Impaired Waterbodies nor a TMDL has been conducted for this receiving stream.  This waterbody is in the Tombigbee River drainage basin, and is classified as Fish and Wildlife.

V.	APPLICABLE GUIDELINES – State of Mississippi Wastewater Regulations (WPC-1),  State of Mississippi Water Quality Criteria (WPC-2), Commercial Facility Guidelines

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 

Parameter		Value					Basis
Flow			0.035 MGD				Design
BOD			30 mg/l 				Domestic Guidelines
TSS			60 mg/l				Domestic Guidelines
E. Coli			200 Col./100mL			Domestic Guidelines
pH			6.0 to 9.0 S.U.				MS WQC
Chlorine		0.1 to 1.0 mg/l				Domestic Guidelines

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).