PERMIT RATIONALE FOR REISSUANCE
Carroll County Board of Supervisors, 
County Courthouse Project
Carroll County
Carrollton, Mississippi
Water NPDES No. MS0059242
April 1, 2024

I.	CLASSIFICATION – NPDES Commercial

II.	DESCRIPTION OF WASTEWATER – Domestic

I.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated via an activated sludge system 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. 

III.	RECEIVING WATERS – Big Sand Creek. The receiving water is located in the Yazoo River drainage basin and is classified as Fish and Wildlife. Big Sand Creek does not appear on the current 2018 State of Mississippi Section 303(d) List of Impaired Water bodies, nor does the discharge appear on a completed Total Maximum Daily Load (TMDL).

IV.	APPLICABLE GUIDELINES – 11 Mississippi Admin Code pt. 6, Commercial Facility Guidelines (Technology), Wasteload Allocation (WLA)

V.	SUMMARY OF DISCHARGE LIMITATIONS – 

Parameter		Value					Basis
Flow			0.015 MGD				Design
BOD			30 mg/l				Technology
TSS			30 mg/l				Technology
E. coli			126 Col./100mL			Admin Code
pH			6.0 to 9.0 S.U.				Admin Code
Chlorine		0.1 to 1.0 mg/l				Technology
Dissolved Oxygen	6.0 mg/l (minimum)			WLA
Total Nitrogen		Report (lbs/day)			WLA
Total Phosphorous	Report (lbs/day)			WLA

Minimum and Maximum values for Influent pH, dissolved oxygen in the aeration unit, and 30-miunte sludge settleability in the aeration unit must also be reported