PUBLIC NOTICE PERMIT RATIONALE FOR REISSUANCE
Gerdau MacSteel Inc
Union County
New Albany, Mississippi
Water NPDES No. MS0000931
July 1, 2025

I.	FACILITY INFORMATION

Facility Name:		Gerdau MacSteel Inc
Facility Address:	922 Highway 15 North 
	New Albany, MS 38652    
Monroe, 
Permit No.:		MS0000931
SIC:			3482
Permit Writer:		Rusty Parrish
EPD Branch:		Water II Branch

II.	NATURE OF BUSINESS

Quanex Corporation stopped manufacturing at this facility by January 1, 2005. In August 2005, the property was sold to Jasper Creek LLC (who uses it for warehousing), but Quanex retained the groundwater treatment system which discharges to Outfall 003. In August 2008, Gerdau MacSteel bought the shares of Quanex.

III.	EFFLUENT AND RECEIVING STREAM FLOW DATA

Outfall 003 is for remediated groundwater. Outfall 003 discharges into an unnamed ditch thence into Jasper Creek with a long term average flow of 0.00285 MGD and a maximum daily flow of 0.0170 MGD. Jasper Creek has a 7Q10 flow of 0 cfs and a mean annual flow (MAF) of 31.01 cfs or 20.04 MGD

IV.	303(d) and TOTAL MAXIMUM DAILY LOAD (TMDL) ISSUES

Jasper Creek does not appear on the 2024 Mississippi List of Impaired Water Bodies. The facility complies with the following applicable TMDLs:
•	Sediment – Yazoo River Basin – Jasper Creek HUC 080302010404 – May 2019
•	Fecal Coliform – Yazoo River – Carroll, Holmes, Leflore, & Warren Counties – June 2003 – ID: 903063013
•	Sediment – Yazoo River Basin – Hills Region –  October 2020
•	Organic Enrichment/ Low Dissolved Oxygen – Tallahatchie & Yazoo Rivers – Yazoo River Basin – April 2008
•	Sediment – Tallahatchie River – Yazoo River Basin – June 2003 – ID: 908063046
•	DDT & Toxaphene – Yazoo River Basin – May 2003 – ID: 903051601
•	Fecal Coliform – Little Tallahatchie River – Panola County – January 2003 – ID: 903011703
•	Sediment – Yazoo River Basin – Delta Region – April 2008 – ID: 908041702
•	Total Nitrogen & Total Phosphorus – Selected Large Rivers in the Delta – Yazoo River Basin – June 2008 – ID: 908063054
•	DDT & Toxaphene – Yazoo River Basin – November 2005 – ID: 905110401
•	Fecal Coliform – Little Tallahatchie River – Union & Marshall Counties – January 2003 – ID: 903011702
•	Sediment – Little Tallahatchie River & Designated Streams in HUC 08030201 – Yazoo River Basin – February 2022

V.	TYPE OF WASTEWATER TREATMENT:

Outfall 003- Equalization, neutralization, filtration, and air stripping.

VI.	EPA APPLICABLE CATEGORICAL GUIDELINES

None.

VII.	DATA FROM APPLICATION FORM 2C

VIII.	CATEGORICAL GUIDELINE LIMITATIONS CALCULATIONS

None.

IX.	TOXICITY SCREENING

Water Quality Evaluation for discharges into unnamed ditch thence into Jasper Creek for Outfall 003. Chlorobenzene, 1,1-Dichloroethylene, Tetrachloroethylene, Toulene, 1,2 Trans-Dichloroethylee, Trichloroethylene, and Vinyl Chloride only have national recommended criteria for Human Health, and historical effluent data for these parameters has been reported as non-detect except for Trichloroethylene; therefore, toxicity screening will not be completed for these parameters including Trichloroethylene. The parameters are all report in the current permit with the exception of Tetrachloroethylene; therefore, the current permit limit for this parameter will be screened to confirm that it is still protective of the human health criteria.

IWC	=	Instream Wastewater Concentration
Qw	=	maximum 30 day average wastewater flow, if available
Qr	=	receiving stream flow (mean annual flow (MAF) for human health screening)
Xwa	=	permit limits from previous permit or from effluent guidelines
Xta	=	the calculated instream concentration based on existing permit limits or the calculated limit based on current effluent guidelines
Xr	=	receiving stream concentration

Human Health Screening

X.	
PROPOSED PERMIT LIMITATIONS

	Outfall 003
MSWQS = Mississippi Water Quality Standards

1-1, dichloroethylene, 1,2- transdichloroethylene, Ammonia (as N), Chlorobenzene, BOD5, TSS, Tetrachloroethylene, Toluene, Trichloroethylene, and Vinyl chloride shall be monitored once per month via grab sampling. DO shall be monitored once per month via grab sampling. pH shall be monitored weekly via grab sampling. Flow shall be monitored daily via a totalizer.

On May 21, 2025, the facility requested the monitoring frequency be reduced from twice per month to once per month for all parameters except for flow and pH. After review of historical site data, MDEQ has no objection to the reduced monitoring frequency.