PERMIT RATIONALE FOR REISSUANCE
Bolton POTW
Hinds County
Bolton, Mississippi
Water NPDES No. MS0021032
March 17, 2025

I.	CLASSIFICATION –Municipal NPDES Minor 

II.	DESCRIPTION OF WASTEWATER – Domestic / Municipal Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Wastewater is collected and treated by means of a conventional lagoon.  No increase in flow is proposed within the application.

IV.	RECEIVING WATERS – Bakers Creek. The receiving waters are located within the Big Black River Basin, and are classified as Fish and Wildlife. The discharge is included in a TMDL that has been drafted for Fourteen Mile Creek for Nutrients, Oxygen Enrichment, and low DO. 

At the point of discharge the 7Q10 for the receiving stream is 0.0 cfs.  The instream wastewater concentration at the point of discharge can be determined by the following calculation:

IWC = {(Qw)/(Qw + Qr)}*100

	Where, Qw = Design flow of the wastewater treatment facility, 0. 21MGD or 0.047 cfs
		 Qr = Receiving stream 7Q10, 0.0 cfs.

IWC = {(0.047 cfs)/(0.047 cfs + 0.0 cfs)}*100 = 100%

V.	APPLICABLE GUIDELINES – State of Mississippi Wastewater Regulations (11 MS admin code part 6),  Municipal Facility Guidelines (Technology), Wasteload Allocation (WLA), Best Professional Judgment (BPJ)

VI.	SUMMARY OF LIMITATIONS –
Parameter				Flow					Basis
Flow					0.21 MGD				Design
BOD5					45 mg/l (Max Monthly Average)	Previous Permit
BOD (Percent Removal)		65% Minimum				Technology
TSS					90 mg/l (Max Monthly Average)	Technology
TSS (Percent Removal)			65% Minimum				Previous Permit
E. Coli					126 Col./100 ml				Admin code
Chlorine, Total Residual 		0.011 mg/l / 0.019 mg/l			Admin code
Dissolved Oxygen			6.0 Minimum				TMDL
pH					6.0 – 9.0 SU				Admin code
NH3-N	(Phase I)			2.0 (Max Monthly Average)		Previous Permit
NH3-N	(Phase II)			1.37 (Max Monthly Average)		WLA
Nitrogen, Total 				20.14 lbs/day				TMDL
Phosphorus, Total			5.74 lbs/day				TMDL		

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 notes as Phase I; Phase II limitations shall not apply at this time. 

Phase II limitations shall apply as soon as the treatment system has demonstrated compliance with the Phase II limitations, but no longer than three (3) years after the issuance of the permit; Phase I limitations shall no longer apply at this time. 

The permittee shall submit an engineering report that describes how the facility will come into compliance with the Phase II limitations.