PERMIT RATIONALE FOR REISSUANCE
Trace Subdivision, Number 4
Lamar County
Hattiesburg, Mississippi
Water NPDES No. MS0055140
April 19, 2018

I.	CLASSIFICATION – Commercial NPDES

II.	DESCRIPTION OF WASTEWATER – Domestic Wastewater

III.	DESCRIPTION OF TREATMENT 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 – Unnamed tributary of Cross Creek.  The receiving waters are located within the Pascagoula River Basin and are classified as Fish and Wildlife. At the point of discharge the receiving stream does not appear on the State of Mississippi’s current 303(d) list of evaluated or impaired waterbodies. The discharge is listed in the Total Maximum Daily Loads (TMDLs) for Nutrient and Organic Enrichment/Low Dissolved Oxygen and the Fecal Coliform TMDL for Bowie Creek and Bowie River.  The limitations in the permit comply with the TMDLs.

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

VI.	SUMMARY OF LIMITATIONS – 
 
Parameter			Value				Basis
Flow				0.0428 MGD			Design
BOD5				30 mg/l (Monthly Avg)	TMDL
Ammonia Nitrogen		2.0 mg/l (Monthly Avg.)	TMDL
Dissolved Oxygen 	         > 6.0 mg/l (Monthly Avg.)	TMDL
E. Coli				126 Col./100 ml		Admin Code
Chlorine, T.R. 		0.011 mg/l 			Admin Code
pH				6.0 – 9.0 SU			Admin Code