PERMIT RATIONALE FOR REISSUANCE
Lincoln County Schools, Enterprise Attendance Center
Lincoln County
Brookhaven, Mississippi
Water NPDES No. MS0034461
March 2023

I.	CLASSIFICATION – NPDES Commercial

II.	DESCRIPTION OF WASTEWATER – Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated biologically via an activated sludge followed by chlorine disinfection prior to discharge. Only one discharge to surface waters is described within the application with no increase in treated effluent flow proposed. 

IV.	RECEIVING WATERS – Unnamed Creek to Boone Creek. The receiving waters are located in the Pearl River drainage basin and are classified as Fish and Wildlife. At the point of discharge, the receiving stream does appear on the current State of Mississippi 303(d) List of Impaired Waterbodies by biological impairment, but the discharge does not appear on a completed Total Maximum Daily Load (TMDL).

V.	APPLICABLE GUIDELINES – 11 Mississippi Admin Code pt. 6, Commercial Facility Guidelines (Technology), State of Mississippi Water Quality Criteria (MSWQS)

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 

	Parameter		Value			Basis
	Flow			0.01 MGD		Design
	Phase I NH3-N		3 mg/l			Last Permit
	Phase II I NH3-N	1.37 mg/l		WLA
	BOD			18 mg/l 			WLA
	TSS 			30 mg/l 			Technology
	E. coli			126 Col./100mL 		WLA
	pH			6.0 to 9.0 S.U.		WLA
	Chlorine			0.011 mg/l		WLA
	Dissolved Oxygen	≥6.0 mg/l		WLA
	Total Nitrogen		Report, lbs./ day		WLA
	Total Phosphorus	Report, lbs./ day		WLA

Minimum and maximum values for influent pH, dissolved oxygen in the aeration basin, and 30-miunte sludge settleability in the aeration basin must also be reported. 
	
VII.	CHANGES FROM PREVIOUS PERMIT – 

2023 Waste Load Allocation established new ammonia limit. The new ammonia limit is added to the proposed draft permit.
The permittee shall achieve compliance with the effluent limitations specified for discharge in accordance with the following schedule:
Upon issuance of this permit, the permittee shall achieve compliance with the effluent limitations specified for the parameters without a phase designation and for the parameters noted as Phase I; Phase II limitations shall not apply at this time.

Beginning upon completion and start-up of improvements needed to comply with Phase II limitations or three (3) years after the issuance of the permit, whichever comes first, the permittee shall achieve compliance with the effluent limitations specified for the parameters without a phase designation and for the parameters noted as Phase II; Phase I limitations shall no longer apply at this time. 

The permittee shall notify our office orally at least 24 hours prior to start-up and in writing no later than 48 hours after start-up.

The Permittee shall Submit engineering report: Due once within 6 months (180 days) after effective date. Said report shall outline the improvement activities needed to upgrade the wastewater treatment facility to comply with the site's Phase II limitations and shall include a proposed schedule for those improvement activities.

The Permittee shall Submit progress report: Due annually - every 1 year after effective date. Said report shall update the Permittee's progress in addressing needed upgrades to the wastewater treatment facility in order to meet the site's Phase II limitations. Said report should also include an updated schedule for completing these activities