NC0004774_Report_20190424

41IN DUKE
James Wells
ENERGY® Vice President
Environmental,Health and Bidet
Programs&Environmental Sciences
526 South Church Street
Mail Code EC13K
Charlotte,NC 28202
[phone]
April 24, 2019
Via Overnight Mail 41
Corey Basinger 4p -N`�G�!/
Mooresville Regional Office Regional Supervisor R 29 Z� R
North Carolina Department of Environmental Quality �7%j�r 19
Division of Water Resources P®r�n�t,lh�e�r�/es
Water Resources - Water Quality Regional Operations on
610 East Center Avenue, Suite 301
Mooresville, NC 28115
Bob Sledge
North Carolina Department of Environmental Quality
Water Quality Permitting Program
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.
S. rely,
James ells
Vice Pr sident,Environment, Health& Safety-
Program and Environmental Sciences
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

Terra
2018 ANNUAL SEEP REPORT
BUCK STEAM STATION
EMC SOC WQ S18-004
1555 DUKEVILLE ROAD
SALISBURY, NC 28146
APRIL 2019
PREPARED FOR
DUKE ENERGY CAROLINAS, LLC
4fraN DUKE
ENERGY.
CAROLINAS
•
Erin N. K' y, EIT
Project Engineer
l 7
Perry drep, N #2453
Pro' ct Manager

2018 Annual Seep Report April 2019
Buck Steam Station, Duke Energy Progress,LLC SynTerra
TABLE OF CONTENTS
SECTION PAGE
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 TABLES
Table 1 SOC Locations and Descriptions-2018 Inspection
LIST OF APPENDICES
Appendix A Photographs
Page i

2018 Annual Seep Report April 2019
Buck Steam Station,Duke Energy Progress,LLC SynTerra
LIST OF ACRONYMS
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
1.0 INTRODUCTION
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
Annual Seep Report must list any seep that has been dispositioned (as described below)
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
Inspection Details
Weather during and preceding the inspection was dear. 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 1):
• North and east of Ash Basin Cells 2 and 3, along the Yadkin River
• Along the 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 induded in Appendix A.
Page 2

2018 Annual Seep Report April 2019
Buck Steam Station,Duke Energy Progress,LLC SynTerra
2.0 FINDINGS
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.
2.2 Impact of Decanting
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
3.0 REFERENCES
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
FIGURE

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DUKE ENERGY PROGRESS BUCK
FYFYFY tE' "'PLANT SITE BOUNDARY
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('®—" `•1 etz, NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM(NPDES)LOCATIONS ARE
DESCRIBED IN PERMIT NC000.1374
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r. S
ej ` I i _ NATURAL RESOURCES TECHNICAL REPORT(NRTR)PREPARED BYAMEC FOSTER
+' •.,I,.,®.. i WHEELER INC..MAY 29.2015.
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a T �- • DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINASTATE PLANE
C•' gfA.} ":/ORDINATE SYSTEM An3200(NAOS)1.
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2018 Annual Seep Report April 2Q19
Buck Steam Station,Duke Energy Progress,LLC SynTerra
TABLE

TABLE 1
SOC LOCATIONS AND DESCRIPTIONS-2018 INSPECTION
BUCK STEAM STATION
DUKE ENERGY CAROLINAS,LLC,SALISBURY,NC
Location Coordinates Receiving Receiving
Facility Sample ID Waterbod Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection
Latitude Longitude y Classification
Seep to UT that flows north to Yadkin River in
Buck 5-01 35.70914 -80.36044 UT to Yadkin River WS-V approximately 2 foot wide channel.Located Monitoring at point prior NA-2B Standards Apply Water was observed to be clear and flowing.
northeast of the active ash basin,north of to any tributary flow to UT
Leonard Road.
Located northeast of the active ash basin,
Buck S-02. 35.709414 -80.359441 UT to Yadkin River WS-V north of Leonard Road.Flows north to Yadkin NA-Seep Dispositioned NA-Seep Dispositioned Steady moderate flow within well defined
River via approximately 4.5 foot wide stream. tributary to Yadkin River.Water is clear.
From sampling-No CCR impacts.
Located northeast of the active ash basin,
Buck S-03. 35.710382 -80.360097 UT to Yadkin River WS-V north of Leonard Road.Flows north to Yadkin NA-Seep Dispositioned NA-Seep Dispositioned Steady moderate flow within well defined
River via approximately 8.5 foot wide stream. tributary to Yadkin River.Water is clear.
From sampling-No CCR Impacts.
Minor amounts of orange aerobic
Seep to approximately 2 foot wide channel,
bacteria/floc/iron-oxidation on substrate.Flow
located northeast of the active ash basin,north Monitoring at point prior Hardness 200 mg/L
Buck S-04 35.711273 -80.360796 UT to Yadkin River WS-V of Leonard Road.Stream flows east to Yadkin to entering Yadkin River Mercury 0.1 pg/L infiltrates underground and re-emerges twice
River. along channel before flowing overland towards
Yadkin River.
•
Seep to short UT below storm water culvert Monitoring at established Orange aerobic bacteria/floc/iron-oxidation on
Buck 5-05 35.712239 -80.364595 UT to Yadkin River WS-V near toe of ash basin dam.UT may receive Duke Energy S-05 pH 6-10 S.U. substrate.No continuous overland flow to Yadkin
flow from S-14 prior to reaching Yadkin River. monitoring site Hardness 200 mg/L River.
Approximately 4 foot wide stream located Steady moderate flow emerging as spring from
north of active ash basin,east of stream bank of tributary to Yadkin River.Orange
Buck S-06. 35.711971 -80.369032 UT to Yadkin River WS-V decommissioned Buck Steam Station facility. NA-Seep Dispositioned NA-Seep Dispositioned aerobic bacteria/floc/iron-oxidation apparent on
Flows north toward Yadkin River.From
substrate and biofllm on the water.
sampling-No CCR impacts.
Approximately 3.5 foot wide stream,located No flow observed,water stagnant.Minor
Buck S-07. 35.708704 -80.378637 UT to Yadkin River WS-V northwest of the active ash basin,west of NA-Seep Dispositioned NA-Seep Dispositioned amounts of orange aerobic bacteria/floc/iron-
Dukeville Road.Flows northwest to Yadkin
oxidation apparent on rip rap substrate.
River.From sampling-No CCR Impacts.
Seep to approximately 1 foot wide channel, Monitoring at established Flow within Yadkin River tributary where crushed
Buck 5-O8 35.708212 -80.378345 UT to Yadkin River WS-V located northwest of the active ash basin,west Duke Energy S-08 Hardness 200 mg/L culvert emerging from beneath Dukeville Road
of Dukeville Road.Flows northwest to Yadkin monitoring site. joins stream tributary.
River.
Monitoring of UT to Yadkin Clear steady flow with orange aerobic
Instream Monitoring to evaluate potential River at established Duke Hardness 200 mg/L / oc/ apparent on
Buck S-09" 35.705502 -80.375677 UT to Yadkin River WS-V impacts from 5-11 and 5-17. Energy S-09 monitoring bacteria Fl iron-oxidation
Location substrate.
Approximately 2 foot wide stream,located Clear stream emerging from spring/seepage area
* west of the active ash basin,west of Dukeville NA-SeeDispositioned NA- Dispositioned with low to medium flow.Sandysubstrate with
Buck S-10 35.702188 -80.376455 UT to Yadkin River WS-V Road.Flow is to Yadkin River.From sampling- p Seep p
rocky cobbles in the channel bottom.
No CCR impacts.
sOC Tables_ALL_Final_2019_04_17 Page I of 2

TABLE 1
SOC LOCATIONS AND DESCRIPTIONS-2018 INSPECTION
BUCK STEAM STATION
DUKE ENERGY CAROLINAS,LLC,SALISBURY,NC
Location Coordinates Receiving
Facility Sample ID Receiving
Latitude Longitude Waterbody Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection
Classification
Seep discharge from terracotta pipe to
ri ra ed channel on north dike wall of ash NA-Monitoring Clear steady flow with orange aerobic
Buck S-11 35.707126 -80.374034 UT to Yadkin River WS-V pp D Established per Terms of See Page 4 of Buck SOC bacteria/floc/iron-oxidation a basin.Flow conveyed to UT to the Yadkin NPDES Permit Document pparent on
River. culvert/terracotta pipe.
Buck S-12** 35.707429 -80.373661 UT to Yadkin River WS-V Channeled seep through a terracotta pipe.Pipe Seep eliminated via engineering repairs.Area
has been plugged;discharge eliminated. NA-Seep Dispositioned NA-Seep Dispositioned
inspected,but seep no longer exists.
Minimal AOW with no flow.Identified as a
Buck S-13** 35.711931 -80.364056 UT to Yadkin River WS-V damp area near pump house;no sufficient NA-Seep Dispositioned NA-Seep Dispositioned No flow observed.Glossy flow to perform sampling.Any flow would biofilm apparent.
move to adjacent storm drain.
Low flow seep near storm water culvert just Monitoring at established
Buck S-14 35.712171 -80.364817 UT to Yadkin River WS-V above S-O5 location.Any flow will move to UT Duke Energy S-O5 See S-OS Minor amounts of orange aerobic
to Yadkin River near 5-05 monitoring site bacteria/floc/Iron-oxidation on rip-rap substrate.
Low flow seep downgradient of S-05 location. Monitoring at established Buck S-15 35.7123 -80.3644 UT to Yadkin River WS-V Seep flows to braided,short reach UT prior to Duke Energy S-05 See S-05 Orange aerobic bacteria/Floc/Iron-oxidation on
entering Yadkin River monitoring site substrate.Biofilm apparent on water surface.
•
Static area of wetness along west dike wall of
Buck S-16** 35.7044 -80.3746 UT to Yadkin River WS-V ash basin.Flow would drain toward S-09 Seep eliminated via engineering repairs.Area
sampling site.Location has been repaired NA-Seep Dispositioned NA-Seep Dispositioned
inspected,but seep no longer exists.
based on no area of wetness.
Filter blanket discharge from west dike wall of NA-Monitoring
Buck S-17 35.7058 -80.3753 UT to Yadkin River WS-V ash basin.Flow conveyed to UT to the Yadkin Established per Terms of See Page 4 of Buck SOC Clear slow flow with no orange aerobic
River. NPDES Permit Document bacteria/floc/iron-oxidation apparent.
NOWPrepared by.Of Checked by.gic
•-Location previously Investigated as a seep.Monitoring has not Indicated the presence of coal combustion residuals.
"-Seep disposltionad via repair end/or non-flowing condition to potentially reach Waters of the U.S.,or other,as noted.Monitoring shad be conducted at the approximate locations indicated on the attached site map.
All monitoring shall be conducted per the requirements found In Attachment c of this Order.
pg/L-micrograms per liter
28-15A NCAC 02L.0202 Standard
CCR-Coal Combustion Residuals
mg/L-mllograms per liter
NA-Not Applicable
NPDES-National Pollutant Discharge System
S.U.-standard Units
SOC-Special Order by Consent
UT-Unnamed Tributary
SOC Tables_ALL_nnal_2019_04_17
Page 2 of 2

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

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

2018 Annual Seep Report April 2019
Buck Steam Station,Duke Energy Carolinas,LLC SynTerra
1
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synTerra

• 2018 Annual Seep Report April 2019
Buck Steam Station,Duke Energy Carolinas,LLC SynTerra
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synTerra

2018 Annual Seep Report April 2019
Buck Steam Station,Duke Energy Carolinas, LLC SynTerra
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• 2018 Annual Seep Report April 2019
Buck Steam Station,Duke Energy Carolinas,LLC SynTerra
SW W NW N
lad 270 ,DO 330 G
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S-11 View of SOC sample location facing west southwest. [
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C 230°SW(T) 135°42'26"N,80°22'25"W t16.4ft ♦729ft
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5-12 View of dispositioned seep location facing southwest. Seep was eliminated
via engineering repairs. 0
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2018 Annual Seep Report April 2019
Buck Steam Station,Duke Energy Carolinas,LLC SynTerra
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! 0 194°S(T) 6 35°42'42"N,80.2t50"W-116.4ft ♦658ft
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S-13 View of dispositioned seep sample location facing south.
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:217°SW(T) *35°42.43"N,80°2152"W f16.4ft ♦657ft
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4 S-14 View of SOC sample location facing southwest. 0
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2018 Annual Seep Report April 2019
Buck Steam Station,Duke Energy Carolinas,LLC SynTerra
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S-15 View of SOC sample location facing west. Seep is monitored at S-05.
No photo provided.Seep was eliminated via engineering repairs.
S-16 0
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2018 Annual Seep Report April 2019
Buck Steam Station,Duke Energy Carolinas,LLC SynTerra
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i S-17 View of NPDES seep monitoring location facing west,
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