PERMIT RATIONALE FOR REISSUANCE
Hinds County School District, Gary Road Elementary
Hinds County
Byram, Mississippi
Water NPDES No. MS0042099
October 30, 2023

I.	CLASSIFICATION – Domestic NPDES

II.	DESCRIPTION OF WASTEWATER – Minor Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated via a conventional lagoon.  

IV.	RECEIVING WATERS – Tributary of Big Creek. Big Creek, near the point of discharge, appears on The State of Mississippi current List of Impaired Waterbodies for nutrient pollution, organic enrichment, low DO, and sediment.  This discharge will be included on the Big Creek TMDL.  All the limitations complies with conditions of the TMDL.  This waterbody is in the Pearl River drainage basin. Big Creek is classified as Fish and Wildlife. 

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

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 

Parameter		Value					Basis
Flow			0.0139 MGD				Design
BOD			10 mg/l				WLA
TSS			90 mg/l				Domestic Guidelines
E. Coli			126 Col./100mL			Domestic Guidelines
pH			6.0 to 9.0 S.U.				MS WQS
Chlorine		0.1 to 1.0 mg/l				MS WQS
	NH3-N			2 mg/l					WLA
	Dissolved Oxygen	6 mg/l (Min)				WLA