PERMIT RATIONALE FOR REISSUANCE
Gulfcoast 7th Day Adventist Church
Harrison County
Biloxi, Mississippi
Water NPDES No. MS0050504
June 2020

I.	CLASSIFICATION – NPDES Commercial

II.	DESCRIPTION OF WASTEWATER – Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated biologically by means of an aerobic treatment unit (ATU) and rock/reed filter 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 Parker Creek. The receiving waters are located in the Coastal Streams 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. The discharge does appear on a completed Total Maximum Daily Load (TMDL) for Fecal Coliform in the Back Bay of Biloxi and Biloxi Bay (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), State of Mississippi Water Quality Criteria (MSWQS)

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 

	Parameter		Value		Basis
	Flow			0.0006 MGD	Design
	BOD			30 mg/l 		Technology
	TSS 			30 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.