NC0089109_Major Modification_20191125

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4,'ROY COOPER ,, yi;
Governor
MICHAEL S. REGAN 7* !r'0"
Secretary `r
LINDA CULPEPPER *I*,(1.""°s
Director NORTH CAROLINA
Environmental Quality
November 25,2019
Mr. Robert Williamson,Plant Manager
American Zinc Products,LLC
484 Hicks Grove Road
Mooresboro,North Carolina 28114
Subject: Draft Major Modification
Permit NC0089109
American Zinc Products,LLC
Rutherford County
Facility Class II
Dear Mr.Williamson:
The Division has received your request to change the Cadmium Compliance Schedule.The request
has been granted. Enclosed with this letter is 1 page that includes necessary modifications.Please
review this page to ensure thorough understanding of the conditions and requirements it contains.
The draft Major Modification contains the following significant changes from your
current permit:
• The Cadmium Compliance Schedule has been extended.
Please provide any comments you have regarding the draft permit to this office by
December 27,2019. At this time,the Division is also publishing a notice in the newspapers of general
circulation in Rutherford County,inviting public comment on the Draft Modification. Following the
30-day comment period,we will review all pertinent comments received and take appropriate action
on the permit modification.
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NorthCardvrj Department of Environmental Quality i Dfvnionci Wean,Rewurces
512 North Salisbury Street 1 Io17Mall 5ervkt Center I Raleigh.North Carolina 27bQQ foil

If you have any questions about the NPDES permit process,please contact me at the
following e-mail address: sergei.chernikov ,n,ncdenr.gov,or telephone number: 919-707-3606.
Sincerely,
Sergei Chernikov,Ph.D.
Environmental Engineer III
Complex NPDES Permitting Unit
cc: NPDES Files
Asheville Regional Office/Surface Water Protection Section (e-copy)
Asheville Regional Office/Public Water Supply Section(e-copy)
ESS/Aquatic Toxicology Unit(e-copy)
Maureen Kinney(e-copy)
Page 2 of 2

Permit NC0089109
A. (6.) CADMIUM COMPLIANCE SCHEDULE
[G.S. 143-215.1(b)]
Activity Description Deadline
1. Commence production of Zinc at Mooresboro Facility. June 1, 2020
2. Ramp-up production to 75%. December 1, 2020
3. Stabilize plant operation and commence evaluation of permit June 1, 2021
compliance.
4. Complete evaluation period. June 1, 2022
5. Prepare a Preliminary Engineering Report (PER) of process December 1, 2022
alternatives and/or pollution prevention/waste minimization (parallel with activity 4)
alternatives designed to achieve compliance. This report would
include the results of the compliance evaluation. Submit to DWR
for review and comment.
6. Agency review and addressing comments February 1, 2023
7. Bench scale test work of process alternatives (start in parallel April 1, 2023
with Activity 6).
8. Evaluate business case and funding requirements for April 1, 2023
technically suitable alternative(s). (parallel with activity 7)
9. Complete pilot test work for selected technology option(s) and August 1, 2023
final technology selection. Develop a summary of the results of
this evaluation. Submit summary to DWR for review.
10. Agency review and addressing comments October 1, 2023
11. Detailed engineering and design of selected option. Submit to February 1, 2024
DWR for comment.
12. Agency review and addressing comments April 1, 2024
13. Prepare capital project application and secure funding for June 1, 2024
selected option, obtain building permits and all needed (much of this work will be done in
approvals for implementation. parallel with activities 11,12)
14. Project implementation, including design completion, June 1, 2025
procurement and construction.
15. Commission and ramp-up. June 1, 2026
16. Stabilize operation and evaluate performance. December 1, 2026
17. Make necessary final modifications to optimize and obtain full August 1, 2027
operational status.
18. Achieve full compliance. December 1, 2027
Page 9 of 9