PERMIT RATIONALE FOR REISSUANCE
Pearl River County School District, Pearl River Central Elementary School
Pearl River County
Carriere, Mississippi
Water NPDES No. MS0054607
June 2018

I.	CLASSIFICATION – NPDES Commercial

II.	DESCRIPTION OF WASTEWATER – Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated 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 –  Stanfield Creek. The receiving water is in the Pearl River drainage basin and is classified as Fish and Wildlife. At the point of discharge, the receiving water does not appear on the current State of Mississippi 303(d) List of Impaired Waterbodies.  The discharge is included in a completed Total Maximum Daily Load (TMDL) for Pathogens in the Pearl River (December 2000).  The facility utilizes chlorine disinfection, which complies with the conditions of the TMDL. 

V.	APPLICABLE GUIDELINES – 11 Mississippi admin Code pt. 6, Commercial Facility Guidelines (Technology), 

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 

Parameter		Value				Basis
Flow			0.03 MGD			Design
BOD			30 mg/l 			Technology
TSS			60 mg/l 			Technology
E. coli			126 Col./100mL		Admin Code
Effluent pH		6.0 to 9.0 S.U.			Admin Code
Chlorine		0.1 to 1.0 mg/l			Admin Code
	
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.