NC0004308_Correspondence_20221216

Badin Business Park LLC
c/o Alcoa Corporation
201 Isabella Street
Suite 500
Pittsburgh, PA 15212-5858 USA
Tel: [phone]
December 16, 2022
Douglas Dowden
Environmental Program Supervisor II
Division of Water Resources / Permitting
Department of Environmental Quality
1617 Mail Service Center, Raleigh, NC 27699
Re: Focused Treatability Study Work Plan — Outfall 005 (NC0004308)
Badin Business Park
Badin, North Carolina
Dear Mr. Dowden:
Please find accompanied with this letter an electronic link to access the Focused Treatability Study
Work Plan (Work Plan) prepared by EHS Support for the Badin Business Park (BBP). This Work
Plan presents a sequence of actions for the evaluation of remedial alternatives for the management
of fluoride -impacted water associated with permitted Outfall 005. Upon completion of this work, a
feasibility study will be submitted for approval to the North Carolina Department of Environmental
Quality (DEQ) that will present the preferred alternatives.
Also included is the Hydrogeological Conceptual Site Model (HCSM) Update. The HCSM
Update provides a framework for the results of the assessments and remedial efforts performed to
date as well as the Work Plan scope.
Many of the Work Plan actions are underway so that sufficient data are generated to achieve
stated objectives. However, there are two elements that require DEQ approval:
• BBP is seeking DEQ feedback before finalizing certain alternatives to be evaluated and will
provide monthly progress reports and meet as needed to facilitate receipt of that feedback;
• To assess a water treatment/management option, BBP is requesting permission to
temporarily redirect water from Outfall 005 drainage basin to the Outfall 012 storm sewer
to enable downstream assessment of changes in flow and fluoride concentrations in the
storm sewer and at Outfall 005. This modification will be a temporary measure until
sufficient design information is available for the bench -scale and pilot testing of treatment
technologies. The water redirected to Outfall 012 drainage basin will comply with
established permit discharge limits.
Should you have any questions or comments, or desire to schedule a meeting to discuss the Work
Plan, please contact Jason Mibroda of Alcoa at [phone] at your convenience.
Respectfully,
v�
Robyn L. Gross
Director, Asset Management Americas
Badin Business Park LLC