PERMIT RATIONALE FOR REISSUANCE
Pine Haven MHP LLC
Harrison County
Biloxi, Mississippi
Water NPDES No. MS0036854
January 2019

I.	CLASSIFICATION – NPDES Commercial 

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 chlorine disinfection prior to discharge.  Only one discharge to surface waters is described within the application with no increase in flow proposed.  

IV.	RECEIVING WATERS – Unnamed tributary of Parker Creek.  The receiving stream is located within the Coastal Streams 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 of Evaluated or Impaired Waterbodies. The discharge does appear on a completed Total Maximum Daily Load (TMDL) for Pathogens in the Back Bay of Biloxi (January 2002).  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 LIMITATIONS – 
Parameter			Value				Basis
Flow				0.02 MGD			Design
BOD5				30 mg/l 			Technology
TSS				60 mg/l 			Technology
Chlorine, Total Residual	0.1 – 1.0 mg/l			Admin Code
pH				6.0 – 9.0 SU			Admin Code
E. coli				126 Col./100 ml 		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. 

Pine Haven MHP LLC must disconnect from its wastewater treatment system and connect to Harrison County Utility Authority's available sanitary sewer system no later than the expiration date (1 year from issuance date) of this permit.