NC0004774_Report_20200526

steiNDUKE James Wells
ENERGY Vice President
Environmental, Health and Safety
Programs&Environmental Sciences
526 South Church Street
Charlotte. NC 28202
[phone]
May 26, 2020
Via Overnight Mail
S. Daniel Smith
Director of Water Resources © E 0 d
North Carolina Department of Environmental Quality -�
1617 Mail Service Center JUN - 1 2020
Raleigh,NC 27699-1617
DIVISION OF WATER RESOURCES
Bob Sledge DIRECTOR'S OFFICE
North Carolina Department of Environmental Quality
Division of Water Resources
Water Quality Permitting Program
1617 Mail Service Center
Raleigh,NC 27699-1617
Subject: Report Under Special Order by Consent—EMC SOC WQ S 18-004 -
Duke Energy Carolinas, LLC—Buck Steam Station
NPDES Permit NC0004774
Final Seep Report
Dear Messrs. Smith and Sledge:
On behalf of Duke Energy Carolinas, LLC(DEC), I am submitting to you the Buck Steam Station
Final Seep Report summarizing the findings of the comprehensive survey completed following
completion of decanting as required by the Buck Steam Station NPDES Permit NC0004774
Special Order by Consent (SOC), SOC No. S 18-004 Section 2.c.4). Completion of decanting
occurred at Buck on March 2, 2020.
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. Smith and Sledge
May 26, 2020
Page 2
Please direct any questions concerning the Buck Steam Station NPDES Permit NC0004774 SOC
No. S18-004 to Robert Wylie at(704) 382-4669 and to Chris Hallman at(980) 373-7892
regarding this Final Seep Report.
Sincerely,
u/► V
�
tti&4
•
James Wells
Vice President, Environment, Health& Safety-
Programs and Environmental Sciences
Duke Energy
Attachment:
Buck Steam Station 2020 Final Seep Report
CC: Richard Baker, Duke Energy
Robert Wylie, Duke Energy
Shannon Langley, Duke Energy
Chris Hallman, Duke Energy
Dale Wooten, Duke Energy
Paul Draovitch, Duke Energy
Matt Hanchey, Duke Energy

synTerra
2020 FINAL SEEP REPORT
BUCK STEAM STATION
EMC SOC WQ S18-004
1555 DUKEVILLE ROAD
SALISBURY, NC 28146
MAY 2020
PREPARED FOR
DUKE
ENERGY.
CAROLINAS
DUKE ENERGY CAROLINAS, LLC
(7--.4°"-0
John Y. Thao
Project Scientist
Walter Gerald, C LG #0446
Project Manager

2020 Final Seep Report May 2020
Buck Steam Station-Duke Energy Carolinas, LLC SynTerra
TABLE OF CONTENTS
SECTION PAGE
1.0 INTRODUCTION 1-1
1.1 Inspection Details 1-2
2.0 FINDINGS 2-1
2.1 General Observations 2-1
2.2 Effects of Decanting 2-1
2.3 Changes to Seep Status 2-2
3.0 REFERENCES 3-1
LIST OF FIGURES
Figure 1 Seep Locations and Inspection Areas
LIST OF TABLES
Table 1 Seep Locations and Descriptions — April 2020 Inspection
LIST OF APPENDICES
Appendix A Photographs
Page

2020 Final Seep Report May 2020
Buck Steam Station-Duke Energy Carolinas,LLC SynTerra
1.0 INTRODUCTION
On April 6, 2020, Walter Gerald (NC Licensed Geologist #0446) of SynTerra inspected
the Buck Steam Station (Buck or Site) property for existing and potential new seeps.
Inspection activities were performed in accordance with North Carolina Environmental
Management Commission (EMC) Special Order by Consent (SOC) WQ #S18-004. That
SOC describes inspection requirements as follows:
No later than 90 days following the completion of decanting at each Facility, and
in the same manner as in the annual surveys, Duke Energy shall conduct a
comprehensive survey 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 this survey, including a section analyzing the effect
decanting of the basins(s) has had on seep flows, accompanied by copies of the
photographs noted above, shall be submitted to the Director of DWR ("Final Seep
Report"). This Final Seep Report must list any seep that has been dispositioned
(as described in subparagraph (3) above) during decanting process, including an
analysis of the manner of disposition. The determination of whether a seep is
dispositioned rests with the Director of DWR. At, or at any time prior to,
submission of the Final Seep Report, Duke Energy shall seek formal certification
from the Director of DWR, certifying the disposition of any seep that Duke
Energy has characterized as dispositioned. Any seeps not certified as dispositioned
by the Director of DWR shall not be deemed as dispositioned.
All locations listed in Table 1 of the SOC were observed and documented with
photographs during the inspection.
General observations include:
• No previously unidentified seeps were observed during the inspection.
• No notable changes to seep status were observed during the inspection.
• Decanting of the ash basins was completed on March 2, 2020.
Page 1-1

2020 Final Seep Report May 2020
Buck Steam Station-Duke Energy Carolinas,LLC SynTerra
1.1 Inspection Details
The weather was clear before and during the inspection. Temperatures ranged from
approximately 64 to 80 degrees Fahrenheit(F). There was no recorded rainfall at the Site
in the five-day period before the inspection, according to information from the on-Site
rain gauge.
The inspector reviewed previous seep inspection reports and the weekly dam safety
inspection reports pertaining to each ash basin, which were prepared by Mr. Kyle
Baucom, P.E., of Duke Energy. Observations from the dam safety inspection reports
were consistent with observations made during the post-decanting 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 Ash Basin Cells 2 and 3
• Along the tributary located west of Ash Basin Cell 1
• Between the Combined Cycle Station and Ash Basin Cell 1, along the dam
• Areas along and downgradient of the ash basin dams
Seep locations and inspection areas are illustrated on Figure 1. Observations noted
during the inspection are summarized on Table 1. Photographs of each seep location,
taken during the inspection, are included in Appendix A.
Page 1-2

2020 Final Seep Report May 2020
Buck Steam Station-Duke Energy Carolinas,LLC SynTerra
2.0 FINDINGS
2.1 General Observations
Inspection observations of each seep are shown in Table 1. Details include the
following:
• No new seeps were observed during the inspection.
• No previously unidentified or unreported pipes were observed during
inspection.
• No flow was observed within the riprap installed along the base of the Ash Basin
Cells 2 and 3 dam.
• A trickle of flow was observed from the culvert at S-14, which is below the toe of
the Ash Basin Cells 2 and 3 dam. Downslope at the S-15 seep location, the
ground was saturated but no flow was observed. At the S-05 location, low flow
was observed in the creek bed, which flowed into the cove area of the Yadkin
River. These findings are consistent with observations made during the 2019
annual seep inspection.
• Location S-13, which is located at the toe of the Ash Basin Cells 2 and 3 dam,
exhibited moist soil conditions, becoming saturated approximately 25 feet to the
southeast, but no flow was observed. These findings were consistent with past
inspections.
2.2 Effects of Decanting
Ash basin decanting was started on February 7, 2019. As provided in the Notification of
Decanting Completion letter to the North Carolina Department of Environmental
Quality (NCDEQ) Division of Water Resources (DWR) on April 2, 2020, decanting was
completed on March 2, 2020. The final seep inspection occurred 35 days after the
completion of decanting. Dewatering of the ash basins was initiated on March 2, 2020,
at the completion of decanting. Dewatering operations are currently pumping at
approximately 500 gallons per minute.
Decanting of Ash Basin Cell 1 has reduced seep flow in the area north of the basin (S-11)
and to the west of the basin (S-17). The dispositioned seep (S-16), also located on the
west side of the Ash Basin Cell 1 dike, was observed as dry during the 2019 annual and
2020 final seep inspections.
Page 2-1

2020 Final Seep Report May 2020
Buck Steam Station-Duke Energy Carolinas,LLC SynTerra
Although decanting was completed for Ash Basin Cells 2 and 3, no significant
reductions in flow were observed at the seeps located north of the basins relative to the
2019 inspection(S-05, S-13, S-14 and S-15).
Flow in the streams to the east-northeast of Ash Basin Cell 3 at seep locations S-01
through S-04 originates in upland areas off-site. No notable changes in streamflow
conditions were observed between the 2019 annual and 2020 final inspections.
2.3 Changes to Seep Status
Mr. Gerald inspected each seep to evaluate whether it met requirements to 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.
No changes to seep status were observed during this inspection.
Page 2-2

2020 Final Seep Report May 2020
Buck Steam Station-Duke Energy Carolinas,LLC SynTerra
3.0 REFERENCES
Duke Energy Carolinas, LLC. (April 2, 2020). Notification for Completion of Decanting,
Buck Combined Cycle Station.
North Carolina Department of Environmental Quality. (2018). Special Order by Consent
EMC SOC WQ S18-004.
Page 3-1

2020 Final Seep Report May 2020
Buck Steam Station-Duke Energy Carolinas,LLC SynTerra
FIGURE

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LEGEND
' ' NPDES CONSTRUCTED SEEP(APPROXIMATE)
' NON-CONSTRUCTED SEEP(APPROXIMATE)
+ DISPOSITIONED SEEP(APPROXIMATE)
' * ASH BASIN WASTE BOUNDARY
I r _
/ "'` —-.DUKE ENERGY CAROLINAS PROPERTY LINE
' - STREAM(AMEC NRTR 2015)
' �
yy - + FLOW DIRECTION
Ir----"'"' ^a WETLAND(AMEC NRTR 2015)
� �` -'*. •
—�+ + +I r' ^'{"-� - SPECIAL ORDER BY CONSENT(SOC)INSPECTION AREA
N, � ar
� ./ ✓' ' ° ^�- „+ NOTES:
% jr * , -- N. / ,, 4 t .:°= € �- '' x 1.SPECIAL ORDER BY CONSENT(SOC)LOCATIONS ARE DESCRIBED IN EMC SOC WQ
Ts
m, * I A .. (_— r 2.NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM(NPDES)LOCATIONS ARE
,p. ti + �" DESCRIBED IN PERMIT NC0004774.
��9 --��, V v ; 3 LE EARTH PRO ON MARCH 19 2018
c . � „ AERIAL PHOTOGRAPHY OBTAINED FROM GOOG
• �' < °-->>^ ' 's. � �* �� .+`a.- - - AERIAL WAS COLLECTED ON OCTOBER 25.2016.
I
.j 4.NATURAL RESOURCES TECHNICAL REPORT(NRTR)PREPARED BYAMEC FOSTER
r-��j r WHEELER INC.,MAY 29,2015.
I ;1 5 WSP SURVEY CONDUCTED APRIL 17,2014.
.. I ' 6 DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
. ,�, ' COORDINATE SYSTEM FIPS 3200(NAD83).
I *. �, .r
��DUKE 500 GRAPHIC.SCALE
. 0 500 1.000
-J: ii= le ENERGY. FIGURE 1
_ CAROLINAS IN FEET)
r� .:�- ',.-'- t --` ' " DRAWN BY:J.KIRTZ DATE:08/20/2019 SEEP LOCATIONS AND INSPECTION AREAS
F REVISED BY J.KIRTZ DATE:04/24/2020
.. <,..<..,., s. .p
°, � � CHECKED BY.I.THAO DATE:04/24/2020
2020 FINAL SEEP REPORT
BUCK STEAM STATION
APPROVED BY J.THAO DATE:04/24/2020
�►'4+— 1 synTe PROJECT MANAGER.W.GERALD SALISBURY, NORTH CAROLINA
, , M.-, i,. i _ "7 www.synterracorp.corn

TABLE 1
SEEP LOCATIONS AND DESCRIPTIONS - APRIL 2020 INSPECTION
2020 FINAL SEEP REPORT
BUCK STEAM STATION
DUKE ENERGY CAROLINAS, LLC, SALISBURY, NC
Location Coordinates Receiving
Facility Sample ID Receiving Waterbody Description*** SOC Monitoring Interim Action Notes from 2020 Inspection
Latitude Longitude Waterbody Classification Levels
Seep to UT that flows north to Yadkin River in Monitoring at point
UT to Yadkin prior to any NA - 2B Standards
Buck S-01 35.70914 -80.36044 River WS-V approximately 2 foot wide channel. Located tributary flow to Apply Water was observed to be clear and flowing.
northeast of the ash basin, north of Leonard Road. UT
Located northeast of the ash basin, north of Steady moderate flow within well defined tributary to
* UT to Yadkin Leonard Road. Flows north to Yadkin River via NA - Seep NA - Seep Yadkin River. Water is clear. Minor amounts of algae on
Buck S-02 35.709414 -80.359441 WS-V
River approximately 4.5 foot wide stream. From sampling Dispositioned Dispositioned creek bed.
- No CCR impacts.
Located northeast of the ash basin, north of
* UT to Yadkin Leonard Road. Flows north to Yadkin River via NA - Seep NA - Seep Steady moderate flow within well defined tributary to
Buck S-03 35.710382 -80.360097 WS-V Yadkin River. Water is clear. Location ID sign has been
River approximately 8.5 foot wide stream. From sampling Dispositioned Dispositioned broken off the post and needs to be replaced.
- No CCR impacts.
Seep to approximately 2 foot wide channel, located Monitoring at point Channel is saturated at the sign location. Flow infiltrates
Buck S-04 35.711273 -80.360796 UT to Yadkin WS-V northeast of the ash basin, north of Leonard Road. prior to entering Hardness 200 mg/L underground and re-emerges twice along channel at lower
River Stream flows east to Yadkin River. Yadkin River Mercury 0.1 pg/L elevations before flowing overland towards Yadkin River.
Seep to short UT below storm water culvert near Monitoring at Low flow in the creek bed to cove area of the Yadkin
UT to Yadkin established Duke pH 6-10 S.U.
Buck S-05 35.712239 -80.364595 WS-V toe of ash basin dam. UT may receive flow from S- River. Minor iron (orange) staining on the creek bottom
River 14 prior to reaching Yadkin River. Energy S 05 Hardness 200 mg/L substrate.
monitoring site
Approximately 4 foot wide stream located north of Steady moderate flow in creek at the ID sign location.
Buck S 06* 35.711971 80.369032 UT to Yadkin WS-V ash basin, east of decommissioned Buck Steam NA - Seep NA - Seep Water is flowing clear. Minor biofilm downstream of ID
River Station facility. Flows north toward Yadkin River. Dispositioned Dispositioned sign. Minor orange iron staining on substrate upstream of
From sampling - No CCR impacts. the sign.
Approximately 3.5 foot wide stream, located
* UT to Yadkin northwest of the ash basin, west of Dukeville Road. NA - Seep NA - Seep Very low flow observed discharging from culvert. Some
Buck S 07 35.708704 -80.378637 River WS-V Flows northwest to Yadkin River. From sampling - Dispositioned Dispositioned clear standing water within the riprap substrate.
No CCR impacts.
Seep to approximately 1 foot wide channel located Monitoring at Low flow within the tributary stream leading to the Yadkin
UT to Yadkin established Duke River. Water is clear. No discharge from the holding pond
Buck S-08 35.708212 -80.378345 River WS-V northwest of the ash basin, west of Dukeville Road. Energy S-08 Hardness 200 mg/L culvert emerging from beneath Dukeville Road where it
Flows northwest to Yadkin River. monitoringsite.
joins the tributary stream.
Moderate flow with much orange biofilm and iron staining
Buck S 09** 35.705502 80.375677 UT to Yadkin WS-V Sampling Location; not a seep NA - Seep NA - Seep on the creek substrate. Relatively wide, shallow channel
River
Dispositioned Dispositioned at the culvert from beneath Dukeville Rd. Location also
receives runoff from S-17 area.
* UT to Yadkin Approximately 2 foot wide stream, located west of NA Seep NA Seep Moderate flow from berm along Dukeville Rd. and the
Buck S-10 35.702188 -80.376455 River WS-V the ash basin, west of Dukeville Road. Flow is to Dispositioned Dispositioned Beneficiation Plant. Clear water, some biofilm growth in
Yadkin River. From sampling - No CCR impacts. back/stagnant waters.
Page 1 of 2 •

TABLE 1
SEEP LOCATIONS AND DESCRIPTIONS - APRIL 2020 INSPECTION
2020 FINAL SEEP REPORT
BUCK STEAM STATION
DUKE ENERGY CAROLINAS, LLC, SALISBURY, NC
Location Coordinates Receiving Receiving Interim Action
Facility Sample ID Waterbody Waterbody Description*** SOC Monitoring Levels Notes from 2020 Inspection
Latitude Longitude Classification
NA - Monitoring
Seep discharge from terracotta pipe to riprapped See Page 4 of Buck Water level in manhole was at the culvert inverts. No
Buck S-11 35.707126 -80.374034 UT to Yadkin WS-V channel on north dike wall of ash basin. Flow Established per SOC Document observed flow. Water is relatively clear, with a slight
River conveyed to UT to the Yadkin River. Terms of NPDES Attachment A orange tint.
Permit
UT to Yadkin Channeled seep through a terracotta pipe. Pipe has NA - Seep NA - Seep Seep eliminated via engineering controls. Area inspected,
Buck S-12** 35.707429 -80.373661 WS-V
River been plugged; discharge eliminated. Dispositioned Dispositioned but seep no longer exists. No issues noted.
Minimal AOW with no flow. Identified as a damp
UT to Yadkin area near pump house; no sufficient flow to NA - Seep NA - Seep Soils were moist at the ID sign and became saturated
Buck S 13** 35.711931 -80.364056 approximately 25 ft southeast of the sign. No overland
River WS-V perform sampling. Any flow would move to adjacent Dispositioned Dispositioned
storm drain. flow observed.
Low flow seep near storm water culvert just above Monitoring at
UT to Yadkin established Duke Trickle of flow from the culvert. Minor amounts of orange
Buck S-14 35.712171 -80.364817 WS-V S-05 location. Any flow will move to UT to Yadkin See S-05
River Energy S-05 bacteria/floc/iron-oxidation on rip-rap substrate.
River near S-05. monitoring site
Low flow seep downgradient of S-05 location. Seep Monitoring at
UT to Yadkin established Duke Saturated ground but no visible flow. Some orange
Buck S-15 35.7123 -80.3644 River WS-V flows to braided, short reach UT prior to entering Energy S 05 See S-05 biogrowth and floc on saturated substrate.
Yadkin River.
monitoring site
Static area of wetness along west dike wall of ash
** UT to Yadkin basin. Flow would drain toward S-09 sampling site. NA - Seep NA - Seep Seep eliminated via engineering controls. Area inspected,
Buck S 16 35.7044 -80.3746 WS-V V
River Location has been repaired based on no area of Dispositioned Dispositioned but seep no longer exists.
wetness.
NA Monitoring See Page 4 of Buck
UT to Yadkin Filter blanket discharge from west dike wall of ash Established per No flow at culvert beneath Dukeville Rd. Some residual
Buck S 17 35.7058 -80.3753 River WS-V V basin. Flow conveyed to UT to the Yadkin River. Terms of NPDES SOC Document iron staining on riprap.
Permit Attachment A
Prepared by: WCG Checked by: JYT
Notes:
* - Location previously investigated as a seep. Monitoring has not indicated the presence of coal combustion residuals.
** - Seep dispositioned via repair and/or non-flowing condition to potentially reach Waters of the U. S.,or other, as noted.
*** - Some descriptions have been updated from the original text found in the SOC Attachment A table for accuracy and currency.
pg/L- micrograms per liter
2B- 15A NCAC 02L.0202 Standard
CCR-Coal Combustion Residuals
mg/L- milligrams per liter
NA- Not Applicable
NPDES- National Pollutant Discharge Elimination System
S.U. -Standard Units
SOC- Special Order by Consent
UT-Unnamed Tributary
Page 2 of 2

2020 Final Seep Report May 2020
Buck Steam Station-Duke Energy Carolinas, LLC SynTerra
APPENDIX A
PHOTOGRAPHS

2020 Final Seep Report May 2020
Buck Steam Station-Duke Energy Carolinas,LLC SynTerra
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Page 1 of 18

2020 Final Seep Report May 2020
Buck Steam Station - Duke Energy Carolinas, LLC SynTerra
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Page 2 of 18

2020 Final Seep Report May 2020
Buck Steam Station-Duke Energy Carolinas,LLC SynTerra
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Page 3 of 18

2020 Final Seep Report May 2020
Buck Steam Station-Duke Energy Carolinas,LLC SynTerra
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Page 4 of 18
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May 2020
2020 Final Seep Report
Buck Steam Station-Duke Energy Carolinas,LLC SynTerra
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