PERMIT RATIONALE FOR REISSUANCE
Heidelberg POTW
Jasper County
Heidelberg, Mississippi
Water NPDES No. MS0040029
June 4, 2024

I.	CLASSIFICATION –Municipal NPDES Minor 

II.	DESCRIPTION OF WASTEWATER – Domestic / Municipal Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated via an HCR. No increase in the annual average flow proposed within the application. 

IV.	RECEIVING WATERS – Bogue Homo Creek.  Bogue Homo does not appear on the current State of Mississippi 303(d) list impaired waterbodies. A TMDL has been conducted for Bogue Homo due to organic enrichment/low DO and Nutrients but it does not impact the limits of this permit. The receiving water is located within the Pascagoula River Basin, and is classified as Fish and Wildlife.  

V.	APPLICABLE GUIDELINES – 11 MS admin code part 6, Municipal Facility Guidelines (Technology), Wasteload Allocation (WLA), Total maximum daily Load (TMDL)

VI.	SUMMARY OF LIMITATIONS –

Phase II Limitations
Parameter			Value					Basis
Flow				0.215 MGD				Design
BOD				30 mg/l					WLA
TSS				90 mg/l					Technology
pH				6.0 to 9.0 S.U.			11 MS admin code part 6
	Minimum Dissolved Oxygen	6.0 mg/l 				WLA
	Chlorine, Total Residual	0.031 mg/l / 0.054 mg/l		MSWQS & IWC		E. Coli				126 Col./100 ml			11 MS admin code part 6
	Ammonia Nitrogen (Phase I)	Report mg/l 			WLA
	Ammonia Nitrogen (Phase II)	3 mg/l 			WLA
	Total Nitrogen			Report (lbs/day)				WLA
	Total Phosphorus		Report (lbs/day)				WLA		

Effluent shall not be discharged to the receiving stream when the stream flow is less than 10 CFS. 
WLA limits are based on regulations for HCR discharges.
Effluent shall not be discharged to the receiving stream when the stream flow is less than ten (10) CFS.  The maximum discharge shall be:
3 MGD @ 10 CFS < stream flow < 15 CFS
4.5 MGD @ 15 CFS < stream flow < 20 CFS
6.5 MGD @ 20 CFS < stream flow
(Note: 10 CFS = 6.46 MGD)

Permittee shall Submit a report: Due annually by the 28th of January detailing date, time, and stream stage when the discharge begin; date, time, and stream stage when the discharge ceased; and the volume of wastewater released for each discharge from Outfall 001 occurring in the previous year except the E. Coli. E. Coli can disinfect after treatment prior to storage.  

The permittee shall achieve compliance with the effluent limitations specified for
discharge in accordance with the following schedule:

Upon issuance of this permit, the permittee shall achieve compliance with the effluent limitations specified for the parameters without a phase designation and for the
parameters noted as Phase I; Phase II limitations shall not apply at this time.

Beginning upon completion and start-up of improvements needed to comply with Phase II limitations or three (3) years after the issuance of the permit, whichever comes first, the permittee shall achieve compliance with the effluent limitations specified for the parameters without a phase designation and for the parameters noted as
Phase II; Phase I limitations shall no longer apply at this time.