PERMIT RATIONALE FOR REISSUANCE
Great River Utility Operating Company LLC, 1st Addition
Lamar County
Hattiesburg,, Mississippi
Water NPDES No. MS0051080
May 2023

I.	CLASSIFICATION – Commercial NPDES 

II.	DESCRIPTION OF WASTEWATER – Domestic Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated biologically by means of an aerated lagoon followed by disinfection.  No increase in capacity is proposed within the application.  

IV.	RECEIVING WATERS – Mixon’s Creek.  The receiving stream is located within the Pascagoula 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 for evaluated or impaired waterbodies.  The discharge is listed in the Total Maximum Daily Loads (TMDLs) for Nutrients and Organic Enrichment/Low Dissolved Oxygen and Fecal Coliform for Bowie Creek and Bowie River. The limitations below have been established to comply with the TMDLs. Only one discharge to surface waters is described within the application.

V.	APPLICABLE GUIDELINES – 11 MS Admin Code pt. 6, Domestic Facility Guidelines, TMDL 

VI.	SUMMARY OF LIMITATIONS –
	Parameter					Value		Basis
	Flow						0.1022 MGD		Design
	BOD5	   					25 mg/l		TMDL
	TSS						60 mg/l		Domestic Guidelines
	Ammonia Nitrogen				2.0 mg/l		TMDL
	Dissolved Oxygen			   > 6.0 mg/l		TMDL
	E. Coli					   126 Col./100 ml		Admin Code
	Chlorine, Total Residual		0.1 – 1.0 mg/l 		Domestic Guidelines
	pH						6.0 – 9.0 SU		Admin Code