NC0045993_Correspondence_20240826

August 27, 2024

Mr. Joe Hinkle, EHS Manager
ATI Specialty Materials, LLC
P.O. Box 5030
Monroe, North Carolina 28110
Subject: Final NPDES Permit
Permit NC0045993
Monroe Facility
Union County
Facility Class I

Dear Mr. Hinkle:

The Division of Water Resources is forwarding herewith the Final Permit for Monroe Facility. This permit is issued pursuant to the requirements of North Carolina General Statute 143-215.1
and the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency dated October 15, 2007 (or as subsequently amended).

The Final Permit contains no following significant change from your Draft Permit.

The Final Permit maintains the following significant changes contained in the Draft Permit:

The limits for Total Copper were added to the permit based on the results of the Reasonable Potential Analysis.
The quarterly monitoring for Total Cadmium was added to the permit based on the results of the Reasonable Potential Analysis.
The monitoring for Total Lead was increased from Monthly to 2/Month to be consistent with monitoring for other TBEL parameters.
The monitoring for Total Copper was increased from Quarterly to 2/Month due to be implementation of the water quality based Total Copper limit.
The temperature monitoring was added to the permit to determine compliance with 15A NCAC 2B .0200.
The Technology Based Effluent Limits for Total Chromium, Total Fluoride, Total Cyanide, Total Nickel, Total Lead, and Total Zinc have been recalculated based on the latest production
data.
The instream waste concentration was changed from 58% to 51% based on the current flow rate.

If any parts, measurement frequencies, or sampling requirements contained in this permit are unacceptable to you, you have the right to an adjudicatory hearing upon written request within
thirty (30) days following receipt of this letter. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed
with the office of Administrative Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-6714. Unless such a demand is made, this permit shall be final and binding.

Please note that this permit is not transferable except after notice to the Division. The Division may require modification or revocation and reissuance of the permit. This permit
does not affect the legal requirements to obtain other permits which may be required by the Division of Water Resources or any other Federal, State, or Local governmental regulations.

If you have any questions or need additional information, please contact Sergei Chernikov, telephone number [phone] or email: [e-mail].

Sincerely,

Douglas Dowden
Environmental Supervisor II
Division of Water Resources

cc: Central Files
NPDES Files
Mooresville Regional Office/Water Quality
WSS/Aquatic Toxicology Unit (e-copy)