PERMIT RATIONALE FOR REISSUANCE
Yazoo County School District, Linwood Elementary School
Yazoo County
Vaughn, Mississippi
Water NPDES No. MS0029912
September 2020

I.	CLASSIFICATION – NPDES Commercial

II.	DESCRIPTION OF WASTEWATER – Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated biologically via an aerated lagoon 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 tributary of Burg Creek. The receiving waters are located in the Big Black River drainage basin and are 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 Impaired Waterbodies, nor does the discharge 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				0.015 MGD	Design
	BOD				30 mg/l 	Technology
	TSS 				60 mg/l 	Technology
	E. coli				126 Col./100mL 	MSWQS
	pH				6.0 to 9.0 S.U.	MSWQS
	Chlorine			0.1 to 1.0 mg/l	Technology
	
VII.	CHANGES FROM PREVIOUS PERMIT – 

E. coli has replaced fecal coliform as the bacterial indicator for all freshwaters in Mississippi designated as Recreation, Fish and Wildlife Support, and/or Public Water supply.