PERMIT RATIONALE FOR REISSUANCE
Region I Mental Health Center, Region 1 Drug and Alcohol Rehabilitation Center
Coahoma County
Dublin, Mississippi
Water NPDES No. MS0049077
May 2, 2013

I.	CLASSIFICATION – Domestic NPDES

II.	DESCRIPTION OF WASTEWATER – Minor Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is treated via septic tanks followed by a sand filter.  

IV.	RECEIVING WATERS –  Unnamed Tributary of Hopson Bayou.  Hopson Bayou does appear on the current 303(d) List of Impaired Waterbodies for Aquatic Life Support due to Nutrients, Low DO, Sediment/Siltation and a TMDL has also been conducted for this receiving stream.  This waterbody is in the Yazoo River drainage basin. The Yazoo River is classified as Fish and Wildlife.  One discharge to surface waters is described within the application with no increase in flow proposed. The discharge from this facility should not further impair water quality.

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

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 

Parameter		Value					Basis
Flow			0.0028 MGD				Design
BOD			30 mg/l (Yearly Average)		Domestic Guidelines
TSS			30 mg/l (Yearly Average)		Domestic Guidelines
Fecal Coliform	200 Col./100mL (Yearly Average)	Domestic Guidelines
Effluent pH		6.0 to 9.0 S.U.				MS WQS
Chlorine		0.1 to 1.0 mg/l				MS WQS