PERMIT RATIONALE FOR ISSUANCE
Lamar Lakes
Lafayette County
Oxford, Mississippi
Water NPDES No. MS0062944
14 April 2026

I.	CLASSIFICATION: NPDES Commercial

II.	DESCRIPTION OF WASTEWATER – Domestic Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater for Lamar Lakes is to be collected and treated via an activated sludge process.  This process is to be achieved with two package plants.

IV.	RECEIVING WATERS – Unnamed tributary of Hurricane Creek.  The receiving stream is located within the Tennessee River Basin.  At the point of discharge the receiving stream does not appear on the most recent State of Mississippi 303(d) list for Biological Impairment.  Total Ammonia Nitrogen limitations have been added to address Ammonia Toxicity concerns in the receiving stream. 

At the point of discharge, the 7-day, 10-year minimum flow, 7Q10, for this unnamed tributary of Hurricane Creek is 0.04 cfs.  The instream wastewater concentration at the point of discharge can be determined from the following calculation:

IW =[(QW)/(QW+QR)] * 100

Where:
QW=Design flow of the wastewater treatment facility, 0.1118 MGD or 0.17 cfs.
QR=Receiving stream 7Q10, 0.04 cfs

IWC=[(0.17)/(0.17+0.04)] * 100=81.23%

V.	APPLICABLE GUIDELINES – 11 MS Admin Code Pt 6, Commercial Facility Guidelines (Technology), MS Water Quality Standards

VI.	SUMMARY OF LIMITATIONS – WLA 
Parameter					Limit			Basis
Flow					0.1118 MGD			Design
Minimum DO				6.0 mg/L			Admin Code
Total Ammonia Nitrogen		1.6 mg/L			Ammonia Toxicity
BOD5					30 mg/L			Model
TSS					30 mg/L			Technology
E. coli					126 col/100mL		Admin Code
Chlorine, Total Residual		0.014 mg/L			Calculation
Total Nitrogen				Report			Model
Total Phosphorus			Report			Model	
pH					6 – 9 SU			Admin Code

MDEQ received an antidegradation report on March 6, 2026 for a proposed 0.1118 MGD discharge from a residential development into unnamed tributary to Hurricane Creek. This antidegradation report was submitted as part of the application for NPDES Permit No. MS0062944.

The Office of Pollution Control must concur with plans and specifications for the installation or modification of the wastewater treatment facility and sewer collection system prior to the commencement of construction. After the completion of the project, the permittee must, through a letter signed by a professional engineer, certify to the Office of Pollution Control that the project has been constructed in accordance with submitted plans and specifications. If any changes to the initially reviewed plans and specifications are made, “as-built” drawings with a list of all changes must also be submitted.

A certificate to operate a sewer utility must be obtained from the Mississippi Public Service Commission prior to operation of the sewer system.

At such times that the facility is operating a portion of their system train, the facility shall comply with loading calculations based on: Permitted Loading = 8.34 x Operational System Train Design Flow x Concentration Limit.