PERMIT RATIONALE FOR ISSUANCE
Rankin County School District, Pisgah High School
Rankin County
Brandon, Mississippi
Water NPDES No. MS0062910
May 5, 2025

I.	CLASSIFICATION – Commercial NPDES Minor

II.	DESCRIPTION OF WASTEWATER – Domestic Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated biologically by means of an activated sludge treatment facility.  No increase in flow is proposed within the application.  

IV.	RECEIVING WATERS – Unnamed tributary of Riley Creek.  The receiving stream is located within the Pearl River Basin and is classified as Fish and Wildlife.  At the point of discharge the receiving stream does not appear on the current State of Mississippi 303(d) list of evaluated or impaired waterbodies nor has a TMDL been conducted for the receiving stream.  Only one discharge to surface waters is described within the application with no increase in flow proposed.  

V.	APPLICABLE GUIDELINES – State of Mississippi Wastewater Regulations, 11 Mississippi admin code part 6 

VI.	SUMMARY OF LIMITATIONS –
	Parameter				Value		Basis
	Flow					0.05 MGD		Design
	CBOD5   				10 mg/l		Modeled
	NH3 – N				1.37 mg/l		WLA
	Minimum DO				6.0 mg/l		WLA
	E Coli					126 Col./100 ml		11 MS admin code part 6
	Chlorine, Total Residual	0.011 mg/l		WLA
	pH					6.0 – 9.0 SU		11 MS admin code part 6
	Total Nitrogen				Report		WLA
	Total Phosphorus			Report		WLA

MDEQ received an antidegradation report on April 10, 2025 for a proposed 0.05 MGD discharge from a residential subdivision into unnamed tributary to Riley Creek. The review of the antidegradation report was completed on April 15, 2025.

The Office of Pollution Control must concur with plans and specifications for the installation or modification of the wastewater treatment facility and sewer collection system prior to the commencement of construction. After the completion of the project, the permittee must, through a letter signed by a professional engineer, certify to the Office of Pollution Control that the project has been constructed in accordance with submitted plans and specifications. If any changes to the initially reviewed plans and specifications are made, “as-built” drawings with a list of all changes must also be submitted