NC0038377_Seep Management Amendment_20220418

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ROY COOPER �`e�YY MICHAEL SCOTT
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Governor Director, Division of Waste Management
ELIZABETH S. BISER 4 ,i RICHARD E. ROGERS, JR.
Secretary % Director, Division of Water Resources
NORTH CAROLINA
Environmental Quality
April 18, 2022
Ms. Jessica Bednarcik, Senior Vice President EHS
Duke Energy
526 S.Church Street
Mail Code EC3XP
Charlotte,NC 28202
Subject: Seep Management Amendment to Closure Plan Conditional Approval&
Correction and Clarification of DEQ July 8,2021 Letter
Duke Energy Progress, LLC—Mayo Steam Electric Plant
NPDES Permit NC0038377
Person County
Dear Ms. Bednarcik:
In a July 8, 2021 letter,the Department of Environmental Quality(DEQ) issued its conditional
approval of the Corrective Action Plan(CAP) Update for the Mayo Steam Electric Plant that had been
submitted by Duke Energy on December 31,2019. The letter also referenced the Seep Management
Plan Amendment submitted by Duke Energy to satisfy the terms of Section 2.d.of Special Order by
Consent(SOC) S18-005, but mistakenly stated it was an amendment to the CAP when it was
submitted as an amendment to the Mayo Steam Electric Plant's Closure Plan.
To provide correction and clarification to issues associated with this matter,DEQ offers the following:
• DEQ has conditionally approved the Seep Management Plan Amendment to the Closure Plan for
the Mayo Steam Electric Plant submitted on May 10, 2021.
• All conditions and requests for additional information stated in DEQ's July 8, 2021 conditional
approval letter for the Mayo Steam Electric Plant CAP Update remain in effect. With particular
regard to the subject of this letter, statements in the July 8,2021 letter regarding seep management,
surface water quality evaluation and reporting, and the Surface Water Assessment Plan are equally
applicable to this conditional approval of the Seep Management Amendment to the Closure Plan.
As an interim measure,Duke Energy shall conduct monitoring and reporting of seeps as described
in Section 3.5 of the Seep Management Plan until approval of the Surface Water Assessment Plan
required in DEQ's conditional approval of the CAP Update. Reporting of the results of testing
should continue to be submitted to DEQ via the email address used for the reporting of SOC data
([e-mail]).
D E�„_ North Carolina Department of Environmental Quality Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center Raleigh.North Carolina 27699-1617
o-o E-� .1 *� /'' 919.707.9000

Ms. Jessica Bednarcik
Mayo Steam Electric Plant Seep Management Plan Conditional Approval/SOC Termination
p. 2
• Oversight of seep management and coordination of the development and approval of the Surface
Water Assessment Plan for the Mayo Steam Electric Plant will continue to be provided by the
Division of Water Resources(DWR). Duke Energy should continue to work with the staff of
DWR's Groundwater Resources Section in these areas.
• The conditional approval provided in this letter activates the SOC termination provision for the
Mayo Steam Electric Plant found in Section 2(b)(4) of SOC S 18-005.As a result, SOC
requirements shall terminate on May 18,2022(30 days following the date of this letter)for this
facility, and, paired with the termination of the SOC for the Roxboro Plant(affirmed October 8,
2021), SOC S18-005 shall terminate in its entirety on that date.
We hope the points noted above provide clarity in this matter and will allow us to continue make
progress toward final resolution of all matters associated with coal ash at the Mayo Steam Electric
Plant. We regret any inconvenience the error in the July 8, 2021 letter may have caused.
If you have any questions about this letter please contact Bob Sledge at(919) 707-3602 or via email at
[e-mail].
Sincerely,
Digitally signed by
Edward 2 Mussler III,P.E.
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Date:2y sign 810:16:59-04WRichard E.Rogers, Edward Mussler
Director Solid Waste Section Chief
Division of Water Resources Division of Waste Management
ec: Laserfiche Files
Ed Mussler
Jeff Poupart
Eric Smith
Scott Vinson -RRO
Shannon Langley—Duke Energy
cc: SOC File