NC0004774_Other Correspondence_20190424 (2)

James Wells
Vice President
Environmental, Health and Safety
Programs& Environmental Sciences
526 South Church Street
Mail Code EC13K
Charlotte, NC 28202
[phone]
April 24, 2019 la P Pi
Via Overnight Mail
OttIR-1 S
Corey Basinger
Mooresville Regional Office Regional Supervisor
North Carolina Department of Environmental Quality
Division of Water Resources
Water Resources - Water Quality Regional Operations
610 East Center Avenue, Suite 301
Mooresville, NC 28115
Bob Sledge
North Carolina Department of Environmental Quality
• nL��zt�ng�Rre _ �a.�.
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Report Under Special Order by Consent — EMC SOC WQ S 18-004
Duke Energy Carolina, LLC Buck Steam Station
NPDES Permit NC0004774
2018 Annual Seep Survey Report
Dear Messrs. Basinger and Sledge:
On behalf of Duke Energy Carolinas, LLC (DEC), I am submitting to you the Buck Steam Station
Annual Seep Report summarizing the findings of the comprehensive survey and to begin
addressing decanting impacts on the seeps as required by the Buck Steam Station NPDES Permit
NC0004774 Special Order by Consent (SOC), SOC No. S 18-004 Section 2.c.3).
As required by the SOC, I certify under penalty of law that this document and all attachments were
prepared under my direction or supervision in accordance with a system designed to assure that
qualified personnel properly gather and evaluate the information submitted. Based on my inquiry
of the person or persons who manage the system, or those persons directly responsible for
gathering the information, the information submitted is, to the best of my knowledge and belief,
true, accurate, and complete. I am aware that there are significant penalties for submitting false
information, including the possibility of fine and imprisonment for knowing violations.

Messrs. Basinger and Sledge
April 24, 2019
Page 2
Please direct any questions concerning the Buck Steam Station NPDES Permit NC0004774 SOC
No. S 18-004 to Elizabeth Glenn at [phone] and to Chris Hallman at [phone]
relative to the annual seep inspection report.
James ells
Vice Pr sident, Environment, Health & Safety -
Duke Energy
Attachment:
Buck Steam Station 2018 Annual Seep Survey
CC: Richard Baker, Duke Energy
Elizabeth Glenn, Duke Energy
Chris Hallman, Duke Energy
Dale Wooten, Duke Energy
Paul Draovitch, Duke Energy
Matt Hanchey, Duke Energy

2018 Annual Seep Report April 2019
Buck Steam Station, Duke Energy Progress, LLC SynTerra
•
1.0 INTRODUCTION............................................................................................................1
2.0 FINDINGS...................:.................................................................................................... 3
2.1 General Observations.................................................................................................. 3
2.2 Impact of Decanting..................................................................................................... 3
2.3 Changes to Seep Status................................................................................................ 3
3.0 REFERENCES................................................................................................................... 4
LIST OF FIGURES
"Figure-1 SOC _Locations_ and Inspection Areas
LIST OF APPENDICES
Appendix A Photographs
Page

2018 Annual Seep Report April 2019
Buck Steam Station, Duke Energy Progress, LLC SynTerra
AOW Areas of Wetness
CCR Coal Combustion Residuals
EMC Environmental Management Commission
SOC Special Order by Consent
Page ii

2018 Annual Seep Report April 2019
Buck Steam Station, Duke Energy Progress, LLC SynTerra
On November 20, 2018, Kathy Webb (NC L.G. #2546) of SynTerra inspected the Buck
Steam Station (Buck or the Site) for existing and potential new areas of wetness
(AOWs). The aforementioned activities were performed in accordance with North
Carolina EMC Special Order by Consent WQ #518-004. That Special Order by Consent
(SOC) describes inspection requirements as follows:
Duke Energy shall conduct annual comprehensive surveys of areas down gradient of ash
basins identifying new seeps, and documenting the physical characteristics of previously
documented seeps. All examinations of seeps must include identification of seeps by
approximate latitude and longitude and date -stamped digital photographs of their
appearance. A report summarizing the findings of the surveys, including a section
analyzing the effect decanting of the basin(s) has on seep flows, accompanied by copies of
the photographs noted above ("Annual Seep Report"), shall be submitted to DWR in
conjunction with submittal of the April 30 quarterly report noted in 2(c)(2) above. This
during the previous year, including an analysis of the manner of disposition.
All locations listed in Table 1 of the SOC were observed and documented with
photographs during the inspection.
General inspection observations include:
® No previously unidentified seeps were observed during the inspection.
® No notable changes to seep status were observed during this inspection.
® Decanting had not begun at the time of this inspection.
Page 1

2018 Annual Seep Report April 2019
Buck Steam Station, Duke Energy Progress, LLC SynTerra
r • �
Weather during and preceding the inspection was clear. Temperatures ranged from
approximately 50 to 60 degrees F. No rainfall occurred in the three days before the
inspection according to the onsite rain gage, but heavy rainfall from the week prior to
the inspection was evident with standing water lingering in areas of poor drainage.
The inspector reviewed previous AOW inspection reports and the weekly dam safety
inspection reports for each ash basin. Scott Harris (system owner) conducted the ash
basin dam safety inspections and prepared the reports. Mr. Scott Harris and Mr. Max
Gardner were interviewed concerning recent rainfall, construction/stabilization projects
associated with the ash basins, and general site conditions in and around the ash basins.
Observations from the dam safety inspection reports were consistent with observations
made during the SOC inspection.
- The inspection included observations in the -following areas; -(Figure -I):
• North and east of Ash Basin Cells 2 and 3, along the Yadkin River
Tributary located east of the Ash Basin Cells 2 and 3.
® Along the Tributary located west of the Ash Basin Cell 1
® Between the Steam Station and Ash Basin Cell 1, along the dam
The inspection scope of work also included a review of the areas identified as
downgradient of the basin. SOC locations are shown on Figure 1. Observations noted
during the inspection are summarized on Table 1. Photographs of each seep location
are included in Appendix A.
Page 2

2018 Annual Seep Report April 2019
Buck Steam Station, Duke Energy Progress, LLC SynTerra
2.1 General Observations
Inspection Observations are shown for each seep in Table 1. Details include:
The inspector observed a culvert with a small amount of flow north of former S-
07 along the access road to the steam plant. Flow was assumed to be storm water
from the northeast of the culvert and not associated with the Ash Basin.
The new retention pond construction was underway and ponded water from a
construction area onsite.
The inspector observed notable flow near a cove of the Yadkin River. This
change in flow appeared to be due to the clearing of trees and vegetation at the
top of the hill associated with the new discharge line.
------- AOW-13 exhibited -wet -conditions -but no flow; consistent -with past inspections.
Flow was noted at the culvert outlet to the Yadkin River.
Decanting of the ash basin at Buck had not yet begun at the time of this inspection.
2.3 Changes to Seep Status
Ms. Webb inspected each seep to evaluate whether it should be dispositioned in
accordance with the SOC. The requirements for dispositioning a seep are as follows:
For purposes of this Special Order, "dispositioned" includes the following: (1) the seep is
dry for at least three consecutive quarters; (2) the seep does not constitute, and does not
flow to, waters of the State or Waters of the United States for three consecutive quarters;
(3) the seep is no longer impacted by flow from any coal ash basin as determined by the
Director of DWR in accord with applicable law and best professional judgment; or (4) the
seep has been otherwise eliminated (e.g., through an engineering solution). If a seep that
has been dispositioned through drying up reappears in any subsequent survey, such a
seep will no longer be deemed dispositioned and can be subsequently re-dispositioned as
specified above. Non -constructed seeps described in paragraph 1(h) of this SOC cannot be
dispositioned through option (2) above.
Seeps dispositioned during 2018 were done so at the time of the SOC issuance. Table 1
lists those seeps dispositioned and the basis for disposition. Seeps identified as
dispositioned at Buck are S-02, S-03, S-06, S-07, S-09, S-10, S-12, S-13, and S-16. These
dispositioned seeps will continue to be inspected and evaluated for any change in flow
conditons.
In general, there was no change in status of the dispositioned seeps and no change in
status of remaining seeps observed during this inspection.
Page 3

2018 Annual Seep Report April 2019
Buck Steam Station, Duke Energy Progress, LLC SynTerra
North Carolina Department of Environmental Quality. (2018). Special Order by Consent
EMC SOC WQ S18-004.
Page 4

2018 Annual Seep Report April 2019
Buck Steam Station, Duke Energy Progress, LLC SynTerra

2018 Annual Seep Report April 2019
Buck Steam Station, Duke Energy Progress, LLC SynTerra

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