NC0005088_Report_20200724

(s DUKE James Wells
le' ENERGY Vice President
Environmental,Health and Safety
Programs&Environmental Sciences
526 South Church Street
Charlotte, NC 28202
[phone]
July 24, 2020
Via Overnight Mail
H
S. Daniel Smith
Director of Water Resources JUL 72W
020
North Carolina Department of Environmental Quality
1617 Mail Service Center DIVISION OF WATER RESOURCES
Raleigh,NC 27699-1617 DIRECTOR'S OFFI^E
Bob Sledge
North Carolina Department of Environmental Quality
Division of Water Resources
Water Quality Permitting Program
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Seep Characterization Report submittal and request for formal certification of
seep dispositions
Duke Energy Carolinas, LLC—Rogers Energy Complex
EMC SOC WQ S 17-009
NPDES Permit NC0005088
Cleveland and Rutherford Counties
Dear Messrs. Smith and Sledge:
On behalf of Duke Energy Carolinas, LLC (DEC), I am submitting to you the enclosed Rogers
Energy Complex(REC)Seep Characterization Report summarizing the findings of the post decant
sampling event and requesting formal certification of seep disposition decisions as described in
the report. The conclusions from this report and the Department's certifications will be
incorporated into the upcoming corrective action plan(CAP)amendment as required by the subject
order. Completion of decanting occurred at REC on March 3, 2020. As outlined in the report, all
remaining areas previously identified as '`seeps" are proposed for dispositioning based on their
characteristics and/or lack of impact to waters of the State.

Messrs. Smith and Sledge
July 24, 2020
Page 2
Please direct any questions about this submittal to Chris Hallman at(980) 373-7892.
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.
Sincerely,
James Wells
Vice President, Environment, Health& Safety
Programs and Environmental Sciences
Duke Energy
Attachment:
Rogers Energy Complex 2020 Seep Characterization Report
cc: Richard Baker, Duke Energy
Robert Wylie/FileNet, Duke Energy
Shannon Langley, Duke Energy
Chris Hallman, Duke Energy
Steve Hodges, Duke Energy
Paul Draovitch, Duke Energy
Matt Hanchey, Duke Energy
Landon Davidson, WQ Regional Supervisor, DEQ Asheville Office

synTerra
SEEP CHARACTERIZATION REPORT
ROGERS ENERGY COMPLEX
CLIFFSIDE STEAM STATION
EMC SOC WQ S17-009
573 DUKE POWER ROAD
MOORESBORO, NC 28114
JULY 2020
PREPARED FOR
drelk DUKE
ENERGY.
CAROUNAS
.
DUKE ENERGY CAROLINAS, LLC
Tim Grant
Project Scientist
Scott Spinner, NC LG #2243
Project Manager

Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
EXECUTIVE SUMMARY
SynTerra has prepared this Seep Characterization Report pertaining to the Rogers
Energy Complex -Cliffside Steam Station (Cliffside or Site). This report presents an
evaluation of whether historical storage of coal ash has affected surface waters
downgradient of the active ash basin, the ash storage area, the former Units 1-4 ash
basin, and the Unit 5 inactive ash basin. This report was prepared on behalf of Duke
Energy Carolinas, LLC (Duke Energy).
ES.1 Introduction
Special Order by Consent (SOC) WQ S17-009, approved on April 12, 2018, addresses
management of seeps from Duke Energy's coal ash basins at Cliffside during the
process of basin closure. That process is regulated under the Coal Ash Management Act
of 2014 (CAMA), G.S. 130A-309.200 through 130A-309.231 and the federal Coal
Combustion Residuals (CCR) rule,40 CFR Parts 257 and 261.
In addition to containing monitoring requirements, the SOC includes these compliance
requirements:
• After completion of decanting, a comprehensive survey of areas downgradient of
ash basins is required so that new seeps are identified and the physical
characteristics of previously identified seeps are documented. Duke Energy is
required to submit a Final Seep Report summarizing the findings of that survey
no later than 90 days after completion of decanting.
• Additional characterization of seeps not dispositioned in the Final Seep Report
will be necessary, and a summary of findings provided within a Seep
Characterization Report must be submitted no later than 150 days after
completion of decanting.
• An amendment to the Corrective Action Plan or Closure Plan describing future
seep management must be submitted no later than 210 days after completion of
decanting.
Decanting of the active ash basin was completed on March 3, 2020. A physical
inspection — to identify new seeps and document the physical characteristics of
previously identified seeps — was completed in March 2020. A new seep, S-39, was
identified during that inspection. Several seeps located southwest, west, and north of
the active ash basin were dry or exhibited significantly reduced flow as a result of
decanting. The findings of the March 2020 inspection are documented in the Final Seep
Report(SynTerra, 2020). The Final Seep Report was submitted on May 27, 2020.
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Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
Observations from seep inspections in November 2019, March 2020, and May 2020 were
evaluated to determine whether any remaining seeps identified during the inspection
are candidates for dispositioning in accordance with the SOC.
Samples were collected in May 2020 from remaining seeps identified downgradient of
the ash basins to facilitate additional characterization of those seeps. Seep samples were
analyzed for constituents consistent with Attachment B of the SOC. The analytical data
were evaluated to determine if any constituents are present in non-dispositioned seeps
at concentrations to be considered for corrective action based on comparison with
applicable North Carolina Administrative Code (NCAC), Title 15A, Subchapter 02B
Surface Water and Wetland Standards (02B). In addition, a review and determination of
the jurisdictional status of remaining seeps is included in this report for further
characterization.
ES.2 Key Findings
Key findings regarding the seep characterization presented in this report include:
• Fifteen seeps (S-01, S-05, S-08, S-09, S-12, S-13, S-17, S-20, S-22, S-24, S-25, S-26, S-
33, S-34, and S-35) remain in dispositioned status as determined by DWR at
issuance of the SOC.
• Pursuant to National Pollutant Discharge Elimination System (NPDES) permit
NC0005088, approved July 13, 2018 and effective September 1, 2018, discharge
flows from constructed seeps S-04 (Outfall 104) and S-06 (Outfall 106) will be
monitored per permit requirements.
• Inspections have identified eight seeps (S-14, S-15, S-16, S-21, S-27, S-28, S-31, and
S-37) that are candidates for dispositioning based on dry or non-flowing
conditions observed at these locations for at least three consecutive quarters.
• Seep S-07 is a candidate for dispositioning based on analytical results that
indicate the seep is no longer impacted by flow from a coal ash basin. Seep S-07
is considered a water of the State (WOS).
• Seep S-39 is a candidate for dispositioning based on initial analytical data that
indicate the seep is not impacted by flow from a coal ash basin.
• Thirteen non-constructed seeps (S-02, S-03, S-10, S-11, S-18, S-19, S-19a, S-23, S-29,
S-30, S-32, S-36, and S-38) remain non-dispositioned. In accordance with the SOC,
they are subject to being addressed in an amendment to the Corrective Action
Plan (CAP) and/or the Closure Plan. Of those, only seeps S-02, S-18, S-19, and S-
19a are preliminarily considered jurisdictional waters.
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Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
o S-02, S-18, S-19, and S-19A-Seep characterization analytical results
indicate that only the reported hardness concentration is greater than 02B
standards. However, the quarterly SOC monitoring data collected at
instream monitoring location C_1_DN (Figure 1), located in the Broad
River downstream of all seep discharges from the Site, indicates that all
Attachment B constituents are less than their respective 02B standards.
o S-03-A preliminary comparison of seep characterization analytical
results to 02B standards, including calculated hardness dependent metals,
identified only concentrations of dissolved cadmium,hardness, sulfate,
and total dissolved solids (TDS) greater than 02B standards. However, the
quarterly SOC monitoring data collected at instream monitoring location
C_1_DN (Figure 1), located in the Broad River downstream of all seep
discharges from the Site, indicates that all Attachment B constituents are
less than their respective 02B standards.
o S-10 and S-11 -These seeps were recently un-dispositioned due to
observed flow, although the flow was insufficient to collect a sample
during the seep characterization sampling event.
o S-23-Seep characterization analytical results indicate that no Attachment
B constituent values were greater than 02B standards.
o S-29, S-30, S-32, S-36, and S-38-Flow at these locations was insufficient to
collect a sample during the seep characterization sampling event.
• The quarterly SOC monitoring data collected at instream monitoring location
C_1_DN (Figure 1), located in the Broad River downstream of all seep discharges
from the Site, indicates that all Attachment B constituents are less than their 02B
standards.
• With concurrence from the Director of the NCDEQ DWR on seep jurisdictional
and dispositional status and the instream 02B standards compliance, it could be
determined that corrective action may not be warranted at any seep locations at
Cliffside.
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Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
TABLE OF CONTENTS
SECTION PAGE
EXECUTIVE SUMMARY ES-1
1.0 INTRODUCTION 1-1
1.1 Decanting Summary 1-2
1.2 Seep Characterization Evaluation 1-2
2.0 FINDINGS 2-4
2.1 Physical Inspection 2-4
2.1.1 Seep Status 2-4
2.2 Seep Sampling 2-5
2.2.1 Data Results 2-6
2.3 Jurisdictional Status of Seeps 2-8
2.4 Dispositional Status of Seeps 2-8
2.4.1 Dispositioned 2-9
2.4.2 Non-Dispositioned 2-10
2.4.3 Changes of Status 2-10
2.5 Decanting Status 2-11
2.6 Ash Basin Closure Status/Corrective Action Plan 2-12
3.0 SEEPS TO BE ADDRESSED 3-1
4.0 CONCLUSION 4-1
5.0 REFERENCES 5-1
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Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
LIST OF FIGURES
Figure 1 Seep Locations and Inspection Areas
LIST OF TABLES
Table 1 Seep Locations and Descriptions—March 2020 Inspection
Table 2 Seep Sampling Results—May 2020
Table 3 Calculated 02B Hardness-Dependent Standards
LIST OF APPENDICES
Appendix A March 2020 Seep Photographs
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Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
LIST OF ACRONYMS
02B North Carolina Administrative Code, Title 15A, Subchapter 02B, Surface
Water and Wetland Standards
Cliffside Cliffside Steam Station
CAMA Coal Ash Management Act of 2014
CCRs coal combustion residuals
CAP Corrective Action Plan
DWR Division of Water Resources
Duke Energy Duke Energy Carolinas, LLC
EMC Environmental Management Commission
JD jurisdictional determination
mg/L milligrams per liter
NCAC North Carolina Administrative Code
NCDEQ North Carolina Department of Environmental Quality
NC L.G. North Carolina Licensed Geologist
NPDES National Pollutant Discharge Elimination System
PVC polyvinyl chloride
Site Cliffside Steam Station
SOC Special Order by Consent
SOP standard operating procedure
USACE U.S. Army Corps of Engineers
USEPA U.S. Environmental Protection Agency
WOS water of the State
WOTUS Waters of the United States
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Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
1.0 INTRODUCTION
On March 30, 2020, Scott Spinner (NC L.G. #2243) of SynTerra conducted a
comprehensive survey of the Rogers Energy Complex- Cliffside Steam Station
(Cliffside or Site) property for existing and potential new seeps. After the seep
inspection, SynTerra prepared a Final Seep Report (SynTerra, 2020) documenting the
findings of the seep inspection as required by the North Carolina Environmental
Management Commission (EMC) Special Order by Consent (SOC) WQ S17-009. This
requirement can be found in the Additional Compliance Measures (Section 2.c.4) of the
SOC.
After submittal of the Final Seep Report, the SOC requires characterization of those
seeps not certified as dispositioned following completion of decanting (Section 2.d).
That section of the SOC describes requirements for seep characterization as follows:
"Following completion of decanting, if any seeps (including both constructed and
non-constructed seeps) have not been certified by the Director of DWR as
dispositioned..., Duke Energy shall conduct a characterization of those seeps.
Duke Energy shall submit a report on the findings of these characterizations
("Seep Characterization Report") to the Director of DWR within 150 days of
completion of decanting at each Facility (i.e., within 60 days of the submittal of
the Final Seep Report). The Seep Characterization Report must include all
sampling datafor En
ergy's g each remaining seep as well as Duke Energy s evaluation of the
jurisdictional status of all seeps at the relevant Facility. The determination
regarding whether a surface water feature is a classified water of the State rests
with DWR."
In May 2020, SynTerra collected samples for analysis from non-dispositioned seep
locations identified in the Final Seep Report(Table 1). Seep samples were analyzed for
constituents consistent with Attachment B of the SOC. Samples were collected in
accordance with Duke Energy's Standard Operating Procedure (SOP) for Seep
Sampling (Duke Energy, 2016). Several locations were not sampled due to dry or
stagnant conditions, insufficient flow, or other observed conditions that would preclude
the ability to collect a valid, representative sample as outlined in Duke Energy's 2016
SOP for seep sampling. The May 2020 seep sampling was conducted to facilitate
characterization of seeps as required by the SOC. Results are provided in Table 2.
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Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
This Seep Characterization Report documents the inspection and analysis results as well
as a preliminary evaluation of the jurisdictional status of all remaining seeps at
Cliffside.
1.1 Decanting Summary
Wastewater inflows ceased, and decanting of free water from the active ash basin
began, on March 31, 2019.
Duke Energy provided a Notification for Completion of Decanting letter to the North
Carolina Department of Environmental Quality (NCDEQ) Division of Water Resources
(DWR) on April 2, 2020. The notification indicated that decanting of the active ash basin
was completed on March 3, 2020.
The March 2020 annual seep inspection occurred 27 days after the completion of
decanting, approximately one year after wastewater inflows to the active ash basin
ceased and decanting began.
1.2 Seep Characterization Evaluation
The purpose of seep characterization is to evaluate whether historical storage of coal
ash has affected surface waters downgradient of the ash basins. This includes
evaluation of the physical status, chemical composition, and jurisdictional
determination of the seeps. The following methods were used in this evaluation:
Physical Inspection
On March 30, 2020, SynTerra conducted a comprehensive survey of areas downgradient
of the ash basins to identify new seeps and to document the physical characteristics of
previously documented seeps. That survey included identification of the seeps by
approximate latitude and longitude and date-stamped photographs of their appearance
(Appendix A). The seeps were evaluated based on appearance, current flow conditions,
and comparison with historical physical conditions. A summary of the findings of the
survey are included in the Final Seep Report (SynTerra, 2020).
Chemical Composition
In May 2020, SynTerra collected samples from non-dispositioned seep locations for
analysis of constituents listed in Attachment B of the SOC. Samples were not collected
from locations where there were dry or stagnant conditions, insufficient flow, or other
observed conditions that would preclude the ability to collect a valid, representative
sample as outlined in Duke Energy's March 2016 SOP for seep sampling. Data collected
from the remaining seeps were evaluated to determine whether concentrations of coal
combustion residual(CCR) constituents meet State criteria. This evaluation is based on
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Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
preliminary comparison with North Carolina Administrative Code, Title 15A,
Subchapter 02B, Surface Water and Wetland Standards (02B).
Jurisdictional Determination
At the time of report issuance, a Waters of the United States (WOTUS) delineation at the
Site, submitted December 1, 2017,has not been approved by the U.S. Army Corps of
Engineers (USACE). SynTerra compared non-dispositioned seep locations to
preliminary wetland and stream boundaries (Amec Foster Wheeler, 2015). In addition,
the known surface water feature existing near seep S-07,not identified on the
preliminary jurisdictional determination (JD), was evaluated and identified as a
perennial water per the DWR Methodology for Identification of Intermittent and
Perennial Streams and Their Origins. The final determination of jurisdictional status of
a surface water feature as a classified water of the State (WOS) or WOTUS rests with the
DWR and USACE.
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Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
2.0 FINDINGS
2.1 Physical Inspection
On March 30, 2020, Scott Spinner (NC L.G. #2243) with SynTerra conducted a
comprehensive survey of areas downgradient of the ash basins identifying new seeps
and documenting the physical characteristics of previously identified seeps. Inspection
activities were performed in accordance with SOC requirements. All locations listed in
Table 1 of the SOC were observed and documented with photographs during the
inspection (Appendix A).
The inspection included observations in the following areas (Figure 1):
• Along the Broad River, north of the Unit 5 inactive ash basin
• Between the Unit 5 inactive ash basin and the Unit 5 power plant
• Along the Broad River,northeast of the former Units 1-4 ash basin
• Along the Broad River,north of the ash storage area
• Along the Broad River,north of the active ash basin
• Along the eastern bank of Suck Creek, adjacent to the active ash basin
• Areas along and downgradient of the ash basins
2.1.1 Seep Status
Seep locations and inspection areas are shown on Figure 1. Observations noted
during the March 2020 inspection are summarized on Table 1.
Details of the physical seep inspection include:
• Several seeps located southwest, west, and north of the active ash basin
are dry or exhibit significantly reduced flow as a result of decanting.
• Seeps unaffected by decanting of the active ash basin were found to be
generally similar to observed conditions inprevious inspections.
g Y P
• A new seep, S-39,was identified west of the Unit 5 inactive ash basin with
flow that reaches an unnamed tributary to the Broad River.
Due to the intermittent nature of some seeps, there were differences in physical
characteristics of seeps S-05, S-10, and S-11 between the March 2020 inspection
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Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
and the subsequent May 2020 seep characterization sampling event. The
differences noted are:
• Seep S-05 was dry during the March 2020 inspection. S-05 was flowing to
the Broad River and exhibited sufficient flow to sample during the May
2020 seep characterization event.
• Seeps S-10 and S-11, originally dispositioned at issuance of the SOC due to
non-flowing conditions, were flowing to the Broad River during the
March 2020 inspection and no longer deemed dispositioned. S-10 and S-11
were significantly drier and not flowing to the Broad River in May 2020.
2.2 Seep Sampling
On May 11 and 12, 2020, SynTerra collected samples for analysis from non-
dispositioned seep locations identified in the Final Seep Report (Table 1), except for
locations where there were dry or stagnant conditions, insufficient flow, or other
observed conditions that would preclude the ability to collect a valid, representative
sample as outlined in Duke Energy's March 2016 SOP for seep sampling. Samples were
collected in accordance with the March 2016 SOP. Seep sample locations are provided
on Figure 1.
Seep locations not sampled, along with observations that would preclude the ability to
collect a valid, representative sample, are provided below:
• S-04 and S-06 — Former seeps that are now National Pollutant Discharge
Elimination System (NPDES) outfalls and sampled in accordance with NPDES
Permit No. NC0005088
• S-10 — Insufficient flow to collect representative sample (less than a quarter-inch
of depth over PVC pipe barrier)
• S-11 — Insufficient flow to collect representative sample (less than a quarter-inch
of depth over PVC pipe barrier)
• S-14 — Seep was dry
• S-15 — Seep was dry
• S-16 — Seep was dry
• S-21 — Seep was dry
• S-27 — Seep was dry
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Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
• S-28 — Insufficient flow to collect representative sample (less than a quarter-inch
of depth over PVC pipe barrier)
• S-29 — Insufficient flow to collect representative sample (less than a quarter-inch
of depth over PVC pipe barrier)
• S-30 — Insufficient flow to collect representative sample (less than a quarter-inch
of depth over PVC pipe barrier)
• S-31 — Seep was dry
• S-32 — Insufficient flow to collect representative sample (less than a quarter-inch
of depth over PVC pipe barrier)
• S-36 — Insufficient flow to collect representative sample (less than a quarter-inch
of depth over PVC pipe barrier)
• S-37 — Seep was dry
• S-38 — Insufficient flow to collect representative sample (less than a quarter-inch
of depth over PVC pipe barrier)
2.2.1 Data Results
Seep samples collected at the Site in May 2020 were analyzed for constituents
listed in Attachment B of the SOC. Those data were collected in order to
characterize the potential for corrective action for seeps not certified as
dispositioned after the completion of decanting as described in SOC Section 2.d.
The analytical results of the seep samples collected at the Site in May 2020 are
included in Table 2. Seep sample locations are provided on Figure 1.
Oil and grease samples were not collected at seeps S-23 and S-39. Those seeps
exhibited sufficient flow to sample via PVC pipe barrier and tubing,but water
was not deep enough to sample for oil and grease without disturbing sediment.
It is notable that all seep pH values observed are within the range of background
groundwater pH values at the Site. Groundwater pH values naturally occur
between 4.0 and 7.5 standard units (SynTerra, 2019). The pH values recorded at
S-03 and S-23, while outside the range of 02B standard values, are considered
naturally occurring and not affected by CCRs.
In addition, 02B standards for select dissolved metals are hardness-dependent
and are calculated based on actual in-stream values as developed and approved
by the North Carolina EMC and approved by the U.S. Environmental Protection
Agency (USEPA).
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15A NCAC 02B .0211 (11)(d) states:
"Hardness-dependent freshwater metals standards shall be derived using
the equations specified in Table A: Dissolved Freshwater Standards for
Hardness-Dependent Metals. If the actual instream hardness (expressed as
CaCO3 or Ca+Mg) is less than 400 mg/L, standards shall be calculated
based upon the actual instream hardness. If the instream hardness is
greater than 400 mg/L, the maximum applicable hardness shall be 400
mg/L."
Reported seep sample hardness values were used to calculate the hardness-
dependent dissolved metals standards. The hardness values ranged from 10.2
mg/Lto 554 mg/Lduringthe May2 2
0 0 g
sam lin event.
sampling
Calculations from Table A in 15A NCAC 02B .0211 (11) (d) were performed for
dissolved cadmium, dissolved chromium, dissolved copper, dissolved lead,
dissolved nickel, and dissolved zinc based on actual in-stream hardness values
for each seep location (Table 3). With the exception of dissolved cadmium at
seep S-03, the concentrations of the hardness-dependent dissolved metals
reported during the May 2020 seep sampling event were less than the calculated
02B standards.
In addition to dissolved cadmium;hardness, sulfate, and total dissolved solids
(TDS) were reported at concentrations greater than their 02B standards at seep S-
03 during the seep characterization sampling event. However, the quarterly SOC
monitoring data collected at instream monitoring location C_1_DN (Figure 1),
located in the Broad River downstream of all seep discharges from the Site,
indicates that all Attachment B constituents are less than their respective 02B
standards.
Analytical results from S-07, S-23, and S-39 indicate that all constituents meet
State criteria.
Constituent concentrations from S-02, S-18, S-19, and S-19a meet State criteria for
all constituents except hardness. There is no human health or aquatic life concern
with increased hardness. Water quality standards for hardness have only been
established in waters classified as Water Supply because hardness is considered
undesirable for economic or aesthetic reasons. The quarterly SOC monitoring
data collected at instream monitoring location C_1_DN (Figure 1),located in the
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Broad River downstream of all seep discharges from the Site, indicates that all
Attachment B constituents are less than their respective 02B standards.
2.3 Jurisdictional Status of Seeps
At the time of report issuance, a WOTUS delineation at the Site, submitted December 1,
2017,has not been approved by the USACE. SynTerra compared non-dispositioned
seep locations to preliminary wetland and stream boundaries (Amec Foster Wheeler,
2015). In addition, the known surface water feature existing near seep S-07, not
identified on the preliminary JD, was evaluated and identified as a perennial water per
the DWR Methodology for Identification of Intermittent and Perennial Streams and
Their Origins. The final determination of jurisdictional status of a surface water feature
as a classified WOS or WOTUS rests with the DWR and USACE. Stream and wetland
data derived from the preliminary JD are included on Figure 1.
Based on this evaluation,non-dispositioned seeps S-02, S-07, S-18, S-19, and S-19a are
considered jurisdictional waters.
2.4 Dispositional Status of Seeps
During the March 30, 2020 seep inspection, Mr. Spinner with SynTerra 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 such that concentrations of all pollutants listed in Attachment B
meet State criteria for four consecutive sampling events with at least seven days
separating each event; 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."
A discussion of the dispositional status of each seep is provided in the following
sections.
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2.4.1 Dispositioned
No seeps have been dispositioned since the SOC became effective in April 2018.
However, several seeps were dispositioned prior to the effective date, as noted in
the SOC and on Table 1. Those seeps are:
• S-01 — Location previously investigated as a seep. Monitoring has not
indicated the presence of CCRs.
• S-05 — Location previously investigated as a seep. Monitoring has not
indicated the presence of CCRs.
• S-08 — Location previously investigated as a seep. Monitoring has not
indicated the presence of CCRs.
• S-09 — Location previously investigated as a seep. Monitoring has not
indicated the presence of CCRs.
• _ — _
10 S Seep is no longer present after the Units 1 4 ash basin excavation
and toe drain removals.
o During the March 2020 inspection, S-10 was observed to be flowing
and reaching the Broad River. S-10 is now considered non-
dispositioned.
• S-11 — Seep is no longer present after the Units 1-4 ash basin excavation
and toe drain removals.
o During the March 2020 inspection, S-11 was observed to be flowing
and reaching the Broad River. S-11 is now considered non-
dispositioned.
• S-12 — Location previously investigated as a seep. Monitoring has not
indicated the presence of CCRs.
• S-13 — Seep is no longer present after the Units 1-4 ash basin excavation.
• S-17 — Seep below the ordinary high water level of Broad River.
• S-20 — Seep dispositioned via repair.
• S-22 — Seep dispositioned via repair;pipe has been plugged; discharge
eliminated.
• S-24 — Location previously investigated as a seep. Monitoring has not
indicated the presence of CCRs.
• S-25 — No measurable flow has been observed during routine inspections.
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• S-26 — Location previously investigated as a seep. Monitoring has not
indicated the presence of CCRs.
• S-33 — Seep is no longer present after the Units 1-4 ash basin excavation.
• S-34 — Location previously investigated as a seep. Monitoring has not
indicated the presence of CCRs.
• S-35 — Location previously investigated as a seep. Monitoring has not
indicated the presence of CCRs.
2.4.2 Non-Dispositioned
With the exception of the seeps discussed in Section 2.4.1, seeps listed on Table 1
are currently considered non-dispositioned. During the March 2020 inspection,
seeps S-10 and S-11 were observed flowing to the Broad River. This was
documented in the Final Seep Report, and those seeps are now considered non-
dispositioned.
2.4.3 Changes of Status
An evaluation of changes in seep physical characteristics over time indicate that
several non-dispositioned seeps documented in Table 1 are considered eligible to
be dispositioned based on the SOC requirements for dispositioning. These
considerations are based on seep inspections performed by SynTerra in
November 2019 (concurrent with quarterly SOC sampling), March 2020 (Final
Seep Report inspection), and May 2020 (concurrent with seep characterization
sampling event). In the terms of the SOC, "dispositioned" includes:
(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
WOTUS for three consecutive quarters.
(3) The seep is no longer impacted by flow from any coal ash basin such that
concentrations of all pollutants listed in Attachment B meet State criteria
for four consecutive sampling events with at least seven days separating
each event.
(4) The seep has otherwise been eliminated (e.g., through an engineering
solution).
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Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
Those seeps requested for dispositioning, along with supporting evidence, are:
• Analytical results from S-07 have met State criteria for greater than four
consecutive sampling events — consider dispositioning based on (3)
above.
• S-14 has been dry for at least three consecutive quarters — consider
dispositioning based on (1) above.
• S-15 has been dry for at least three consecutive quarters — consider
dispositioning based on (1) above.
• S-16 has been dry for at least three consecutive quarters — consider
dispositioning based on (1) above.
• S-21 has been dry for at least three consecutive quarters — consider
dispositioning based on (1) above.
• S-27 has been dry for at least three consecutive quarters — consider
dispositioning based on(1) above.
• S-28 has been dry and/or has not flowed to WOTUS for at least three
consecutive quarters — consider dispositioning based on (1) and (2)
above.
• S-31 has been dry for at least three consecutive quarters — consider
dispositioning based on (1) above.
• S-37 was discovered after the SOC went in effect,but has been dry and/or
has not flowed to WOTUS for at least three consecutive quarters —
consider dispositioning based on (1) and (2) above.
• S-39 was discovered after the SOC went in effect, and was sampled during
the May 2020 seep characterization sampling event. Sampling data from
that event indicate no detectable concentrations of CCR indicator
parameters such as boron.
2.5 Decanting Status
Decanting of free water from the active ash basin began and wastewater inflows to the
active ash basin ceased on March 31, 2019. Decanting of the active ash basin was
completed on March 3, 2020. Decanting of the active ash basin has caused several
notable changes to seep status:
• Southwest of the active ash basin, seeps S-28, S-31, and S-37 are now dry.
Page 2-11

� 1
Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
• Southwest of the active ash basin, seeps S-29, S-30, and S-32 exhibit reduced flow
compared to pre-decanting conditions.
• West of the active ash basin, near the toe of the upstream dam, seeps S-14, S-15,
S-16, S-21, and S-27 are now dry.
• North of the active ash basin, seeps S-24 and S-25 exhibit reduced flow compared
to pre-decanting conditions.
2.6 Ash Basin Closure Status/Corrective Action Plan
Excavation of the former Units 1-4 ash basin began in October 2015 and was completed
in February 2018. The footprint of the former Units 1-4 ash basin has been re-graded
and is now the location of lined retention basins and a wastewater treatment plant.
Closure plans for the active ash basin, the ash storage area, and the Unit 5 inactive ash
basin were submitted to NCDEQ DWR in December 2019 and are currently under
review.
On December 31, 2019, Duke Energy submitted a Corrective Action Plan (CAP) Update
report (SynTerra, 2019) to the NCDEQ DWR. In accordance with the Coal Ash
Management Act of 2014 (CAMA), the CAP Update addresses remediation of affected
groundwater associated with the active ash basin, the ash storage area, the former Units
1-4 ash basin, and the Unit 5 inactive ash basin. Corrective action pertaining to the
active ash basin and the ash storage area includes groundwater extraction and clean
water infiltration within the excavated footprint of the ash storage area to address
constituents that have migrated beyond the geographic limitation. The geographic
limitation is defined as 500 feet from the ash basin waste boundary, at the property
boundary, or the boundary of a water body, whichever is closer. Proposed corrective
action pertaining to the former Units 1-4 ash basin consists of phytoremediation trees
and tree wells north and northeast of the former ash basin. Proposed corrective action
pertaining to the Unit 5 inactive ash basin includes groundwater extraction and a source
control trench northeast of the ash basin to address constituents migrating toward the
geographic limitation.
Page 2-12

Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
3.0 SEEPS TO BE ADDRESSED
Seeps were evaluated for disposition based on the physical status, chemical
composition, and jurisdictional determination as described in previous sections of this
report and listed in Section 2.4.3. Any seep not certified as dispositioned shall be
characterized for management in a manner that will be sufficient to protect public
health, safety, welfare, the environment, and natural resources (SOC Section 2.d).
The following seeps have not been dispositioned and do not currently meet criteria to
be dispositioned:
• S-02, S-18, S-19, and S-19a — Seep characterization analytical results indicate that
only the hardness value is greater than 02B standards (Tables 2 and 3). However,
the quarterly SOC monitoring data collected at instream monitoring location
C_1_DN (Figure 1 , located in the Broad River downstream of all seepdischarges
( Su ) g
from the Site, indicate that reported hardness values are less than the 02B
standard.
• S-03 — Seep characterization sampling data indicate that hardness, sulfate, TDS,
and dissolved cadmium are greater than 02B standards (Tables 2 and 3).
However, the quarterly SOC monitoring data collected at instream monitoring
location C_1_DN (Figure 1), located in the Broad River downstream of all seep
discharges from the Site, indicates that all Attachment B constituents are less
than their 02B standards.
• S-10, S-11, S-29, S-30, S-32, S-36, and S-38 — Seeps were unable to be sampled
during the seep characterization sampling event. Current analytical data is not
available. However, the quarterly SOC monitoring data collected at instream
monitoring location C_1_DN, located in the Broad River downstream of all seep
discharges from the Site, indicates that all Attachment B constituents are less
than their respective 02B standards.
• S-23 — Seep characterization analytical results indicate that only the pH value is
outside the range of 02B standards (Table 2). However, as discussed in
Section 2.2.1, the reported pH is within the range of calculated groundwater
background values for the Site. Furthermore, pH is less than the 02B standard at
the SOC instream monitoring location C_1_DN, downstream of all seep
discharges from the Site.
Page 3-1

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
4.0 CONCLUSION
In accordance with requirements set forth in the SOC, SynTerra (on behalf of Duke
Energy) performed an evaluation of all seeps downgradient of the ash basins at
Cliffside. The purpose of this evaluation is to determine seep status with regard to the
preliminary JD and characterization of those seeps not dispositioned after decanting of
the active ash basin. The evaluation included:
• A comprehensive survey in March 2020 to identify any new seeps downgradient
of the ash basins after decanting and to document the physical characteristics of
previously identified seeps
• An evaluation of May 2020 seep sampling data, for constituents listed in
Attachment B of the SOC, to determine whether any constituents are present in
non-dispositioned seeps that have the potential to be considered for corrective
action based on comparison to applicable 02B surface water standards
• A review of preliminary jurisdictional stream and wetland determinations at the
Site
Based on the findings from evaluations presented in this report, the following
conclusions have been developed:
• Fifteen seeps (S-01, S-05, S-08, S-09, S-12, S-13, S-17, S-20, S-22, S-24, S-25, S-26, S-
33, S-34, and S-35) remain in dispositioned status as determined by DWR at
issuance of the SOC.
• Thirteen non-constructed seeps (S-02, S-03, S-10, S-11, S-18, S-19, S-19a, S-23, S-29,
S-30, S-32, S-36, and S-38) remain non-dispositioned.
• Pursuant to National Pollutant Discharge Elimination System (NPDES) permit
NC0005088, approved July 13, 2018 and effective September 1, 2018, discharge
flows from constructed seeps S-04 (Outfall 104) and S-06 (Outfall 106) will be
monitored per permit requirements.
• Inspections have identified eight seeps (S-14, S-15, S-16, S-21, S-27, S-28, S-31, and
S-37) that are candidates for dispositioning based on dry or non-flowing
conditions observed at those locations for at least three consecutive quarters.
• Two seeps (S-07 and S-39) are candidates for dispositioning based on analytical
results that indicate they are not impacted by flow from a coal ash basin.
Page 4-1

Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
• The quarterly SOC monitoring data collected at instream monitoring location
C_1_DN (Figure 1), located in the Broad River downstream of all seep discharges
from the Site, indicates that all Attachment B constituents are less than their
respective 02B standards.
• With concurrence from the Director of the NCDEQ DWR on seep jurisdictional
and dispositional status and instream 02B standards compliance, it could be
determined that corrective action may not be warranted at any seep locations at
Cliffside.
Page 4-2

T
Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
5.0 REFERENCES
Amec Foster Wheeler (2015). Natural Resources Technical Report- Cliffside Steam Station -
Cleveland and Rutherford Counties, NC.June 2015.
Duke Energy (2016). Standard Operating Procedure for Seep Sampling. March 2016.
North Carolina Department of Environmental Quality (2018). Special Order by Consent
EMC SOC WQ S17-009. April 2018.
SynTerra (2019). Corrective Action Plan Update—Cliffside Steam Station. December 2019.
SynTerra (2020).2020 Final Seep Report—Cliffside Steam Station. May 2020.
Page 5-1

Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
FIGURE

1
•
/•
' ( / aA a LEGEND
. nq" .. AREA yS NPoE9 CONSTRUCTED SEEP
N1' A e
• NON CONSTRUCTED SEEP
'}- • OSPOSRpNED SEEP
I ` C WSTREAM SURFACE WATER LOCATION PER SOC
f ~mil ��aw+^ °y _ —ASH BASIN WASTEBOUNDARV
,' / \ -�ASM STORAGE AREA BOUNDARY
—.DUKE ENERGY CAROLINAS PROPERTY ONE
0�p—�STREAM IAMEC NRTR 2015)
T�WETLAND CAMEO NETS ROCS)
• 31 SPECIALORDER BY CONSENT(SAC)INSPECTION AREA
/ SURFACE WATER FLAN DIRECTION
••••••• ,__,... _
rmt
..,.....N...,.....N. 4 we aED .P EaO _a cOMSENT IsoDn�AT o.�weoescR s®.E.oaxTo
I,009
RF„E,.T«Ars,Re,M F>:.,roRE GENT FIED,D,AOENTrosA,IM
k'y ` R R M T wAT aM SYSER IwDEe.DDARDNS
- . ---* ERTUNDSANDSTREAMS BOUNDARIES EERE=TIEDFRDM STREAM AND
':: wsER«EE RNR NFN,
\-� N N M REST
7 PROPERTY BOUNDARY FRO>DEOBY UKEENERGY CARO.NA,
- �° •. STNEW.TENSOFTNEusDE�NEATON„.sNOTSEEN.PRROYEDs.TNE
\\ \` gAYOMN16A9AAERM0TCSBO AaY Is AOME MAP ON
`' , ••� ,/ P,AN"R025RO a VEZIEET Ab3327.5=MOFMORTNOARa,M..E,.
FIGURE 1
0 r,' ( "'' < ENERuY �>• A << SEEP LOCATIONSANO INSPECTION AREAS
SEEP CHARACTERIZATION REPORT
/••� 1 .a.- ROGERS ENERGY COMPLEX
r- !1 µ 1 �,,'. �, (CLIFFSIUE STEAM STATION)
/ \ ` syfl d »,ME srIOUA2P P MOORESBORO,NORTH CAROLINA

Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
TABLES

TABLE 1
SEEP LOCATIONS AND DESCRIPTIONS-MARCH 2020 INSPECTION
SEEP CHARACTERIZATION REPORT
ROGERS ENERGY COMPLEX-CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS,LLC,MOORESSORO,NC
Location Coordinate. Receiving
Fscil ty Swaps ID Waterbody Description""" SOC Monitoring Interim Action Leval Notes from March 2020 Inspection
Latitude LongHtrde WebrOotly Classification
Steady flow within 3 toot wide stream touted northwest of Iron oxidizing bacteria apparent on substrate near the outlet of
Cllflslde S-01" 35.215639 -81.775344 Broad River WS-Iv ante S inactive ash Eosin. NA-Seep Dispositloned NA-Seep Dispositloned the draw.Steady flow consistently observed within a well-
defined channel.
Seep drainage in wetland area via 1-2 foot wide stream pH 5-10 S.U.
channel,located north of the Unit 5 inactive ash basin. Hardness 800 mg/L
Monitoring at established
UT II*Bread Drainage collects seep flows from 5-18,5-19 and 5-19A. Mercury 0.1 pg/L Row is steady and dear.Orange aerobic bacteHa/floc/iron-
Cliflsitle S-02 35.217217 -81.]68678 Nver WS-N Flows north to the Broad River at a point approximately 50 Duke Energy 5-02 Sulfates 500 mg/L oxidation apparent on substrate.
feet downstream of the former Unit 5 inactive ash basin monitoring site TDS 1000 mg/L
discharge outfall. Thallium 0.5 pg/L
Three pipes observed from the bank.Two pipes are 6-
Minor seepage and groundwater influence from former Units terracotta and are dry.One pipe Is a 30'cortugated steel pipe
Cllffside S-03 35.22001 -81.7577 Broad River WS-N 1-4 ash basin area to sample point within former condenser Broad River Instream NA-20 Standards that has corroded at the base.Seepage emerges from the
circulating water discharge anal for retired Units 1-4. Monitoring Apply bank below the pipe.Flow is steady from below the steel pipe
and orange aerobic bacteria/floc/Iron-oxidation Is apparent on
substrate.White precipitate observed.
•
CliRslde S-05" 35.218147 -81.749844 Broad River WS-IV Diffuse flow emerging horna small area along the banker NA-Seep Dispositloned NA-Seep Dispositloned No flow or wetness observed.
the Broad River and base of the active ash basin.
•
UT[v Broad Steady,clear and braided flow in a relatively level area Monitoring at established Flaw Infiltrates a[berm between river and Me seep.Overland
Clif aide S-07 35.218642 -81.745975 River WS-N northeast of the active ash basin at edge of property lire. Duke Energy 5-07 pH 5-10 S.U. flow discharge to the river was not observed.
• Flow Is north to Broad River. monitoring she
CliRslde S-08" 35.208547 -81.755781 Suck Creek WS-IV Natural conveyance tributary to Suck Creek NA-Seep Dispositloned NA-Seep Dispositloned Silty and sandy substrate with no apparent floc/Iron-oxidation.
Similar to previous inspections.
CliRslde 5-09" 35.217122 -81.754244 Sock Creek WS.N Minor,diffuse flow to Suck Creek near confluence with Broad NA-Seep Dispositloned NA-Seep Dlsposlooned Flow observed on rock face entering Suck Creek.Orange
River. aerobic bacteria/floc/iron-oxidation apparent on substrate.
Seep located near bank of Broad River,adjacent to former Braided flow from 4 to 5 locations.Sandy and silty substrate
Broad River Instreaat NA-28 Standards
• CliRslde S-10 35.219472 -81.756731 Broad River WS-IV Units 1-4 ash basin.Minor flow in distinct or braided with apparent orange aerobic bacteria/floc/Iron-oxidation.
channels. Monitoring Apply (Seep no longer considered disposltloned due to flow.)
Seep touted near bank of Broad River,adjacent to former Sandy and silty substrate with slight orange aerobic
OMside 5-11 35.2194 -81.756617 Broad River WS-N Units 1-4 ash basin.Minor flow In distinct or braided Broad River Instream NA-28 Standards bacerla/floUlron-oxidation observed.Flow race Is a trickle with
ciannals. Monitoring Apply seepage from 3 or 4 locations below rip-rap.(Seep no longer
considered dispositloned due to flow.)
Diffuse seepage to area of wetness with no defined channel Water relatively dear with flow at a trickle.Orange aerobic
Cliffside S-12" 35.217658 -81.7517E13 Broad River WS-N on bank of Broad River below ash storage area.Area of NA-Seep Dispositloned NA-Seep Dispositloned bacteria/floc/Iark an datlon apparent on substrate.Flaw
wetness does not reach surface waters. emerging from bank and flowing toward,but not reaching the
Broad River.
•
Minor flow was located at bank of Broad River,adjacent to
CliRslde S-13"" 35.218353 -81.754942 Broad River WS-IV former Units 1-4 ash basin.Following ash basin excavation, NA-Seep Dlspositioned NA-Seep Dlsposltbned No flow or wetness observed.
seep has disappeared.
Seepage located along toe of the active ash basin upstream Suck Creek Instream NA-28 Standards
Offside S-14 35.214511 -81.755844 Suck Creek W5-IV dam.Area.No Rowing water observed.Any lbw would move Monitoring Apply Pooled water by sign,but no now[vivant Suck Creek.
toward Suck Creek.
• Second seepage area located along toe of the active eon Suck Creek Instream NA-26 Standards
Offside 5-15 35.214297 -81.756117 Suck Creek WS-IV basin upstream dam.No flowing water observed.Any flow Monitoring Apply No flow or wetness observed.
could move via poorly incised channel toward Suck Creek.
Third seepage area looted along toe of the active ash basin Sufic Creek Inztream NA-2B Standards
Clifhide S-16 35.2191 -81.756208 Suck Creek WS-IV upstream dam.Any minor flow could move via channelized Manitpnq q No flow or wetness observed.
area toward Suck Creek. g pp y

TABLE 1
SEEP LOCATIONS AND DESCRIPTIONS-MARCH 2020 INSPECTION
SEEP CHARACTERIZATION REPORT
ROGERS ENERGY COMPLEX-CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS,LLC,MOORESBORO,NC
Location Coordinates Receiving
Facility Semple ID RecWNeiving irbod Watarbady De•cAPtien • SOC Monitoring Interim Action Levels Notes from March 2010 Inspection
'anew. Longitude y ClaaaKlwtion
Offside S-17•• 35.217192 -81.769272 Broad River WS-N Minor seep at river edge and below the ordinary water NA-Seep Disposltloned NA-Seep Disposllloned No flow or wetness observed.
level of Broad River,west(upstream)of 5-02.
UT to Broad Seepage from npraP at toe of Unit 5 Inactive ash basin main Monitoring at S-02 Flow converges to create 5-02,then on to Broad River.Orange
Offside 5-18 35.216439 -81.768564 River dam.Flows north Into wetland area draining to sampling site monitoring site Sea 5-02 aerobic bacteria/flaUiron-oxidation apparent on substrate.
5-02.
Seepage from wooded area at toe of Unit 5 Inactive ash basin
UT to Broad Monitoring at 5-02 Flow converges to create 5-02,Men on to Broad River.Orange
Cllflside 5.19 35.216361 -81.768681 River Flows nor area main dam.Flth Into wetland draining to monitoring site Set 5-02 aerobic battens/floc/iron-oxidation apparent on substrate.
sampling site 5-02.
Seepage from wooded area at toe of Unit 5 InactlW ash basin Monitoring at S-02 Flow converges to create 5-02,then on to Broad River.Orange
Offside 5-19A 35.216581 -81.769217 Broad River WS-ry main dam.Flows north Into wetland area draining to monitoring site See 5-02 aerobic bacteria/Roc/Iron-oxidation apparent on substrate.
sampling site 5-02.
Cliffside S-2044 35.215856 -81.765217 Broad River WS-N Stagnant seep at toe of Unit S Inactive ash basin saddle dam. NA-Seep Olspotwoned NA-Seep Dlspositloned Seep not visible In area of rip-rap repair.Water exists ditch
Seep dlspasitloned via repair. farther downgradient near the cooling tower.
Seep located along toe of the active ash basin upstream dam. Suck Creek Instream NA-2B Standards
Offside 5-21 35.214625 -81.755953 Suds Creek WS-IS Area of wetness-no flowing water observed.Any flow would Monitoring Apply No flow or wetness observed.
move toward Suck Creek.
Offside 5-22•• 35.218278 -81.748258 WS-IV Pipe has been plugged;discharge eliminated. NA-Seep Disposltioned NA-Seep DlsposNoned Mpe IS plugged and not visible,no discharge.
Soap to pooled area adjacent to the Broad River,located Fended water present at seep emergence.Visible Rows
Offside S-23 35.217994 -81.750208 Broad River WS-ry north of Me active ash basin.Minor seepage from pool Broad River Instream NA-2B Stantlaros reaching Broad River to the east of where this flow is casualty
emerges with any minor flow draining north to the Broad Monitoring Apply observed.
River.
Offside 5-24• 35.218139 -81.749428 Broad Rover WS-ry Minor seepage near bank of Broad River and north of acme NA-Seep DlsposMoned NA-Seep Dispositloned Sandy and silty substrate.Stable with less flaw than usually
ash basin. observed.Flow reaching the Broad River.
Minor seepage north at ash storage area.No measurable flow Wet with flow near the placard,then Infiltrates the ground
Cllflside 5-25•• 35.217689 -81.751894 Broad River WS-N has been observed throughout site history. NA-Seep Dlspositioned NA-Seep Dlsposiboned prior to readying the Broad River. Less flow fhan previous
Inspections.
Seepage from steep bank and eroded head cut near bank of Sandy and silty substrate with rock outcrops.Flow is a trickle
OIH'de 5-26• 35.217425 -81.753931 Suck Creek WS-IV Suds Creek. NA-Seep Disposltloned NA-Seep oisposiboned emanating from rock outcrop.Flow in channel does not enter
Suds Creek.
Seep located along toe of the active ash basin upstream dam. Suck Creek Instreem NA-2B Standards
Offside 5-27 35.21383 -81.756478 Suck Creek WS-W Area of wetness-no flowing water observed.Any flow would Monitoring Apply No flow or wetness observed.
move toward Suck Creek.
Cliffside 5-28 35.211677 -81.753876 Suck Creak WS-IV Minor diffuse groundwater seepage along steep Dank of Suck Suck Creek Intreem NA-2B Sta
ndards No now or wetness observed.
Creek,west of the active ash basin. Monitoring Apply
Minor diffuse groundwater seepage along steep bank of Suds Suck Creek Instreaw NA-28 Standards Fbw is lo and dear.Orange aec Dacteria/fiuc/iron-
OiRside 5-29 35.211542 -81.753993 Suck Creek WS-N oxidation w apwrent on substrate.lerobiss flow Man previous
Creek,west of Me active ash basin. Monimrirg Apply Inspections;water trickles over rock to Suck Creek.
Minor d0100e groundwater see Ion steepFlow discharges across several areas toward Suds Creek over
Offside 5-30 35.211496 -81.75391 Suck Creek WS-N 9roun page Wong bank of Sufic Sufic Creek Intreem NA-2B Standards rocks and as drip faces along the bank. Less flow than
Creek,west of the active ash basin. Monitoring Apply
previous inspections.
Offside 5-31 35.211482 -81.753887 Suck Creek WS-N Minor diffuse groundwater seepage along steep bank of Sufic Suck Creek Inrtream NA-28 Standaros No flow or wetness observed.
Creek,west o/the active ash basin. Monitoring APPly
hreia3

•
TABLE 1
SEEP LOCATIONS AND DESCRIPTIONS-MARCH 2020 INSPECTION
SEEP CHARACTERIZATION REPORT
ROGERS ENERGY COMPLEX-CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS,LLC,MOORESBORO,NC
Loatlon Coordinates Bac I I Receiving —
Facility Sample ID Wabrbedy doodad on r SOC Monitoring Interim Action Lanais Not.from March 2020 Impaction
Latitude Longitude Wat 'IdY Classification
011ldde 5-32 35.211258 -81.753646 Suck Creek WS-IV Minor diffuse groundwater seepage along steep bank of Suck Suck Creek Instream NA-2B Standards Area Is wet but not flowing.Wetness does not reach Suck
Creek,west of the aNve ash basin. Monitoring Apply Creek.
Seep was located at bank of Broad flyer,adjacent to former
Offside S-33r' 35.218272 -81.754754 Broad RWer WS-IV Units ash basin.Following ash basin excavation and NA-Seep Dispotltinned NA-Seep Dlspositioned No flow or wetness observed.
construction of NPOES outfall structure,seep has
disappeared.
Cliffside S-34r 35.217556 -81.753725 Suck Creek WS-N Seepage front steep bank and eroded head cut near bank of A Seep Dispositloned NA-Seep Dispositioned No flow or wetness observed.
Suck Creek.
Infiltrates prior to entering tributary.Sandy and silty with
Clifside S-35r 35.208203 -81.755703 Suck Creek WS-IV Natural conveyance near bank of Suck Creek. NA-Seep Olsposltloned NA-Seep Dbposltloned minor amounts of iron-oxidizing bacteria observed at the
confluence of the tributary.
Minor diffuse groundwater seepage along bank of Suck Suck Creek Instream NA-2B Standards
Offside 5-36 35.210258 -81.753983 Suck Creek WS-N Creels,southwest of Me active ash basin. Monitoring MDh Steady Sickle flow from three drip faces.
Seep located approximately 20 feet downstream of 5-36 and
Cllf/slde 5-37 35.210266 -81.753827 Suck Creak WS-IV southwest of the actve ash basin.Flow emerges 25 feet from Suck Creek Instream NA-2B Standards Notable iron atalning and floc present.Ponded water at point
Suck Creek as standing water whldh becomes shallow, Monitoring Apply of amanatlon but no flow toward or Into Suck Creek.
flowing,and somewhat diffuse as it flows toward Suck Creek.
Seep emerges near the ordinary high water mark of the
Cllffsltle S-38 35.217759 -81.752742 Broad River WS-N Broad River north of the active ash basin.Flow Is low and Broad River Instream NA-213 Standards Flow Is low and not apparent when river levels are high.Iron
travels through multiple channels In sandy shoreline Monitoring Apply staining Present on sandy substrate.Flaw reaches Broad River.
substrate toward the Broad River.
Soaps Diocorared Darin"2020 Impaction
Flow emerges from three locations along bank of unnamed Flow emerges from three locations along bank of unnamed
UT to Broad Broad River Instream NA-2B Standards
Offside 5-39 35.217759 -81.752742 RiverWS-N tributary to the Broad River.Flow is a trickle from each Monitoring Apply tributary to the Broad River. Flow is a trickle from each
emergent point. emergent point.Insufficient volume to sample.
NPDES Loratluna
Seepage from bank downgradient of active ash basin and ash Steady flow consistently within a well-defined rip-rap channel.
Outfall 104
35.21]641 -81.752596 Broad River WS-N Discharge Limlt storage area to a channel flowing toward the Broad River. NA-Monitored per Terms NA-NPDES Permit
Offside Silty and clayey sand beneath rip-rap.Orange aerobic
(formedy 5-04) Outfall has been Improved with riprapatlons reinforcement along of the NPDES Permit bacteria/floc/Iron oxidizing bacteria apparent on rip-rap
banks and flows through a V-notch weir. Apply substrate along channel.
Steady stream with moderate flow volume within well-defined NA-NPDES Permit Steady moderate flow.Water Is dear.Seepage observed at toe
Outfall 106 NA-Monitored Per Terms of the dam at/near the rip-rap pile.Vegetation conceals some
Olffdtle 35.21844 -81.748266 Broad River WS-N channel at toe drain for active ash basin downstream dam, Disdurge Limitations
(formerly S-O6) near the confluence with the Broad River, of the NPDES Permit Apply flaw.Orange aerobic bacterial/floc/iron-oxidation oxidation apparent on
substrate along channel,especially apparent in eddies.
Prepared by xor Camel by:GTC
kens.dr.SAS Checked p:TIG
.,orcN
• a �a.no.arre
•• bey updated!ram ate Original nrd mwwthe oC uummant Avuek ror accuracy anatn
mtnI ed.ed
m ner
NA riot Applicable
SOC Specal
kJ, unn.,nea
Aare t ofr

TABLE 2
SEEP SAMPLING RESULTS-MAY 2020
•
SEEP CHARACTERIZATION REPORT
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS,LLC,MOORESBORO,NC
net,ea warre. .11.1.0.5.51.NOM=(TOTAL C.150111113.11,001)
WNW. OW41*
wane.Fweenw we T.•••••••• illonana • nen1WW. new Are* 64.0 Saw M.. CaleNan MM.Ow.. 1.11.rms..WNW.awnedease Oat. pnommbi
mmm ••• m•Pmfm. mML •nr am mho arm_ y0/L e/1. N.1. ./1. ww/l. 41.1. ann. nagn.
Lost.01 LanWen I. $nd. Mndnt I.1W .1.14 .1.143
14044
S-02 NatuSAS Unot S Inn..Saw Water 35.217001144 411.7611113210 05/11/2020 6.6 17 419 4.71 07 142 6.6 40 <1 . 345 <509 <0.1 54.7 4.3 <1 <0.5
5,113 111-4*awn anal maw ma Raw Wats 1-4 nallan Wear 3022004096.111.75701424 03/11/2020 20 902 5.42 173 3. 4. 12 0.02 33 0/ <1000 247 1. 41 <1 290
NE a4 AcItn Pei NW *INN 15.21044137 J1.74571540 05/12/2020 14 40 MO WI 354 11.1 NA S1 27 72 <MO .1 2.59 6.1 1 <I <0.1 141
10 71117.9 at non..Wm unit 5 In../05 0.11 Wan 1321943407 .01.76640204 05/11/2020 0.5 AI 451 131 3H 44 11M <1 39 451 <509 <ILI 57.3 3.0 <1 <0.5
2.111 Woo.area . Md. U.5 triad..1.41 Wan 3021631.e .61.756141109 05/11/2020 10 333 147 352 19.5 4.91 <1 57 131 <190 <0.1 .1 4.6 1.07 <1 <O./
5.1.95 Wooded area N to•Man 4.1. 1,5 5 Inart...51 Warm' 33.21431390 .41.769941. 05/11/2020 6.3 16 317 7.65 157 31.2 0.1 ILI <1 53 115 <200 <O./ 71 6.4 <1 .2
11 01 Mr Wawa.,.01 aver An.AN 0Wn Wear 35.211110511-01.74904201 05/12/202.3 15 10.90 164 .2 2. 0.19 <1 00 131 DO <0.1 7.55 II 2.311 <0.I .2
W e11/11 AS.Mene to 0.0 Una 5 Iracen.11.11 W.. 352134 41.77385 05/111211. 07 15 11-21 110 323 15.7 1.37 <1 35 <Al <1.00 <OA 2.35 02 1.40 <1 <ILI 11.9
SOL 01.51112014 04.1.0 LOCATION 9101.111411/1.11.1.1110 ...545.M.N.OWNS 50115.1.11.0141
II mmm I 35.2190800I-1111.739KLIM I9.30020 05 I 07 I 1145I I 151 I ..1II I<H I 1. I no I 4.13 I Co I <I I <1 I 00.1 I 17.2
139 SAW.WW1. POLO 1.114.1401111. 0nN,0fl10Li1 0171.1101412W111.011310)
Mg FINS Wank 100.2 011/12/1020 . NM NM NM NM NM N14 144 NA NA 1. MMMMM
- 00/11/2020 11/4 NM 1114 VW NM NS MN
/09
later sank 1.0-05._ ./12/2020 NM N14 11011 1N4 NM MMM latt
/Ip Wan 95/12(2020 1N4 1114 WI NM NM
NoSan
' fossoloca Oxygen and<timidity are nOt requIrea paraineters per SOL Attacnowolt 5.
-Mercury stana•rto of 0 0 L2o9/1.momenta a ohm.,value.
0.solo ea chrohourn seandand of II us,reprosen.a.ran,Yalu•speak dlasolVed chromiuM 121aaolved chromnan male. haranan..wmant a.an wan.,rri 7.14 DisatOlVis1 chromium conowntraflor.horn Me May.20 sampan°avant reprasent total dissotred chromium conarratIons.
=aioe ho,rnt.cella indicate ooncentoations greater IN,fop..conearycieve I re,.Ac 02.,c]aaa voS,eundamig.mantrad oxygen ane nannolan.l.indicate Is nuc 028(gam alanaaras.
ISA NOAC 020(Class C.WS-1,41-ISA IICAC On.0200 Sa.anIrpc Can C,WS-IV Sui/ao•wawa
el Tanpet analytic.diconed,n meth.piano at or abova Oa reporting Tanpat concentrabon sawn.war nag.aan 1911 the caolcantration,n method Wank.4ialyte oancentrabon nano ea not irlf•clici by...no contaminabon.
.0,e“
G.•pnons anon
•1.1.5 02S(Om C,WS-151 lartana nranrant ea:*on calculatbn using actual Ln-aolown Kann.nine.sem rable 1.
,rnnewon-anon.,Per
-aware.par lur
ask-millionths par at.
NA.Not anatyotal
NCAC-Nom, AOrranistrallve Code
nE•Nor entanan.
nn-nnt measurea
-NapholomotrIc Tannin units
SOC-aralai Oran ay Consent
•
raw.12

TABLE 2
SEEP SAMPLING RESULTS-MAY 2020
SEEP CHARACTERIZATION REPORT
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS,LLC,MOORESBORO,NC
uuLTnw MMLTO(TOTAL LONC1.1.1W1340 n(01500219.0 CoNCSNTYTION)
TM. Tata
S.NTaui O..wer z..S NOSax.. Haw{ NMN . NNrr 5w.r n01Sr..o.wW.P S F.rS.S v.L uw10 (9.19) a8.4.) (0..10 la NMM ar.
(SwO.) (au.) IaMN) l5.uy)(o..aN)laM.)(aMP)
P.wNy.. AWL 911E2 M/L M/L mPN/L OWL Ns .NEL M/5 .105 .YL M/L M/L M/L AWL M/L M/L AWL AWL
[U lain2O Iae.S..O..ON.r SwbM UDR W �. LWrOal.r.. WMMiNwb
a r rvnp MIMI < Mill0
ui. <
5/.1020 <1 1.5 < el < <
5-10 Maw rN rata.01135.9. << < << .: ; E
m 9.0.1 Rear Ufa Inatire 5ssin Water 253154 e!IU
U e .001St1x <5 <.(TOTAL<xn.ODTTMTION55CONLSNTMna11.1n5n02O 0.215 I 1.. 0..1.I .11 m�I V n. I . 3 5.5 I 4O.2 I 55 I . I <5 <I .02 I Pw I I <O.2 I .5
yC lP.RS P55u5nANALVTICAL RESULTS(TOTAL CONm0TR.5TION) 111111LRICILL MOULTS(05MOL090 CONm.TPAnON)
rq 21.0 eww m-ox -• .-- -•• 05//42010 NA NA .0.905
T,y N.N, _. _ waw -- ... 55/12n020 Nx M 40.00. Nn NA NA AL NA NA N. NA NA NA NA N5 NA NA NA
ALPram.n p:726 Ch.M.INC
e19wnot w.a4n w 90C MAMA.B.
291/rt NiOneee. chronic.N
10 mat Atear . anaN.Wt..at ...aq.e a ISO 1 M L M.O.
.O
2*5*0*0 ?.w.a1mnN.r..we(LOT?r..10000 dver m(0*0 C.W..9).+101t.* 00(0010 N.O.505*0em. 000005 o..N.emm.wmrmnenoN15 NCACw)0 2020(C,0mwOw«.N nOra.m mrN a®N.e ammw�n m.ronrw..
i.TIPS.a 9 a as mir...0 n..ra a. Ilm.as mnwr.NW.15 NC AC OZS(a..C.ws rv)Nuq.ra.Orq.N o.yo.n rare 5N ngnig0m uiN iiwue mrmOwam is ONn pgwp.mwr.wW.1s ncwc oxf(ae c,ws-rvl.mnOxm.
a.2.0aer.O.MWa C.
ze(Om<,WSM•MxCio2 fltoosvq.SP.o.c,TwatSUN0 MN.
-.O.n.Cab.O.S.manOe eun.a.aa..a.navtNp Orria TvOnaW..uvNNSm q.MpNaOW.>0r.n lOx..mivw5.n g5r..rau.x MAIL nruM.meumw.n q..mW.arwt ame.e h blank mam.nm
Op C•e.11on.0 e
uc0.n poNrraN
n SWNM par mlnuta
ox0 Mass 4 wf-M+m.e.q 0 nWnw Mone.ra Owe on ognNNn mqf.Oua.-awur NwOr.au..Sr
Nmx.Wan•2.1n pranerwNr
.2•944999 Pa xm
laa
90-92-miNa.n w.w MOi.
NE-Nat alteNis.
Neu-Nyn.m.acnrmeq um+
50C-5.161 Ora.by Cm.M
5.U.-M mnam umm

TABLE 3
CALCULATED 02B HARDNESS-DEPENDENT STANDARDS
SEEP CHARACTERIZATION REPORT
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS,LLC,MOORESBORO,NC
Cadmium(Dissolved) Chromium(Dissolved)*
Hardness Value Hardness Value
In-Stream Calculated 028 Calculated 025 Cadmium In-Stream Calculated 0213 Calculated 028 Chromium
Used for 0213 Used for 025
LootlOn ID Hardness Calculation Acute Standard Chronic Standard (Dissolved) Location ID Hardness Acute Standard Chronic Standard (Dissolved)
(m9/L)3 (p9/L)3 (p9/L)' (p9/L)° Calculation
(mg/L)' (m9/L)' (m9/L)' (p9/L)' (p9/L)' (p9/L)`
5-02 215 215 5.33 0.76 imi<0.1 5-02 215 215 1066.50 138.73 <1
S-03 554 400 9.15 1.20 5-03 554 400 1773.30 230.67 <1
5-07 14.1 14.1 0.50 0.10 <0.1 S-07 14.1 14.1 114.53 14.90 <1
5-18 216 216 5.36 0.76 <0.1 5-18 216 216 1070.56 139.26 <1
5-19 185 185 4.68 0.67 <0.1 5-19 185 185 942.99 122.66 <1
5-19A 280 280 6.71 0.92 <0.1 S-19A 280 280 1324.09 172.24 <1
5-23 42.2 42.2 1.29 0.22 <0.1 5-23 42.2 42.2 281.08 36.56 <1
5-39 11.9 11.9 0.43 0.08 <0.1 S-39 11.9 11.9 99.67 12.97 <1
C_1_DN 17.2 17.2 0.59 0.11 <0.1 C_1_DN 17.2 17.2 134.77 17.53 <1
Copper(Dissolved) Lead(Dissolved)
In-Stream Hardness Value Calculated 025 Calculated 020 Co Hardness Value
Used for 028 Copper In-Strum Calculated 020 Calculated 0213 Lead
0213
Location ID Hardness Acute Standard Chronic StandardUsed for ion
Calculation (Dissolved) Location ID Hardness Acute Standard Chronic Standard (Dissolved)
(n39/L)' (p9/L)' (p9/L)' (p9/L)` m /L)' Calculation
(m9/L)' ( 9 (m9/L) (p9/L)' (p9/L)' (p9/L)`
5-02 215 215 27.64 17.23 <1 5-02 215 215 146.99 5.73 <0.2
5-03 554 400 49.62 29.28 <1 S-03 554 400 280.85 10.94 0.924
5-07 14.1 14.1 2.12 1.68 <1 5-07 14.1 14.1 7.26 0.28 <0.2
5-18 216 216 27.76 17.29 <1 5-18 216 216 147.71 5.76 <0.2
5-19 185 185 23.99 15.15 <1 S-19 185 185 125.31 4.88 <0.2
5-19A 280 280 35.46 21.59 <1 S-19A 280 280 194.09 7.56 <0.2
5-23 42.2 42.2 5.96 4.28 <1 S-23 42.2 42.2 24.96 0.97 <0.2
5-39 11.9 11.9 1.81 1.45 <1 5-39 11.9 11.9 5.98 0.23 <0.2
C_1 ON 17.2 17.2 2.56 1.99 <1 C_I_DN 17.2 17.2 9.10 0.35 <0.2
Page 1 of 2

P
TABLE 3
CALCULATED 02B HARDNESS-DEPENDENT STANDARDS
SEEP CHARACTERIZATION REPORT
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS,LLC,MOORESBORO,NC
Nickel(Dissolved) Zinc(Dissolved)
In-Stream Hardness Value Calculated 02B Calculated 02B Nickel In-Stream Hardness Value Calculated 02B Calculated 02B Zinc
Used for 02B used for 02B
Location ID Hardness Acute Standard Chronic Standard (Dissolved) Location ID Hardness Acute Standard Chronic Standard (Dissolved)
Calculation Calculation
(mg/L)' (m9/U' (pg/L)3 (p9/L)' (pg/L). (mg/L)' (m9/L): (p9/L)' (pg/L)' (P9/L)' •
5-02 215 215 894.76 99.38 8.96 5-02 215 215 224.15 225.98 <5
5-03 554 400 1512.89 168.04 162 S-03 554 400 379.30 382.40 302
5-07 14.1 14.1 89.27 9.92 <1 5-07 14.1 14.1 22.28 22.47 <5
S-18 216 216 898.28 99.77 15.5 5-18 216 216 225.03 226.87 7.78
5-19 185 185 787.94 87.52 <1 5-19 185 185 197.35 198.96 <5
S-19A 280 280 1118.82 124.27 3.69 S-19A 280 280 280.37 282.66 <5
5-23 42.2 42.2 225.67 25.07 1.54 5-23 42.2 42.2 56.41 56.87 <5
5-39 11.9 11.9 77.34 8.59 <1 S-39 11.9 11.9 19.30 19.46 <5
C_1_DN 17.2 17.2 105.61 11.73 <1 C_3_DN 17.2 17.2 26.37 26.59 <5
Prepared by:IL Checked by:2PC
H9W1
'-Actual in-stream hardness analytical result from May 2020 sampling event
'-Hardness value used for calculation based on regulation In 15A NCAC 02B.0211(11)(d)
3-Calculations for 0213 acute and chronic hardness-dependent standards were performed in accordance with calculations presented in Table A of 15A NCAC 02B.0211(11)(d)
'-Analytical result from May 2020 sampling event
'-Calculated hardness-dependent dissolved chromium values are specific to Chromium(III).The standards for dissolved Chromium(VI)are not hardness-dependent and are equal to 16 pg/L(acute)and 11 pg/L(chronic).
Analytical results from the May 2020 sampling event represent total dissolved chromium concentrations.
®-Blue highlighted cells indicate concentration greater than applicable calculated acute or chronic 02B standard.
-Concentration not detected at or above the adjusted reporting limit.
02B-North Carolina Administrative Code Title 15A,Subchapter 028-Surface Water and Wetland Standards
pg/L-micrograms per liter
mg/L-milligrams per liter
Page 2 of 2

Seep Characterization Report July 2020
Rogers Energy Complex—Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
APPENDIX A
MARCH 2020 SEEP PHOTOGRAPHS

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NW N NE
300 330 0 30 60
. I • I • I • I • I • I • I • I • I • I • I • I • I • I
® 353°N (T) OO 35°13.004'N, 81°46.481'W ±16ft ♦ 686ft
Yt'4 1�'.,,� " ytic t�-t ',, s .. "{i,+ • _ ate,, y" .z t'
�Y v " ,i,. min�rw :a'' 'f� Y.:
'�jr wee;
,�i ter,,, z-44xi, F
1 dery
...0.4104r, . ..„
rf i t
' pra s.-
q
A.O. Ill/.
S_1
:`
tyy
tl: ''� fir �e .L
,Y, f ,,i it ' 30- . „„I 04140, Q,t2"4Q,
Y,
S-01 View of dispositioned seep location facing north. '
Page 1 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
1!
N NE E
0 30 60 90 120
0 54°NE (I) OO 35°13.030'N, 81°46.127'W ±16ft A 656ft
I"' , . ., ,,
� ,_
:t. A A r +Y1 d r `"„tom a ,,,,
:.� : t t -!
S c 2 14,. A
•
it�N
i
;s{; M ♦ '` : -fit
- 2/. N
I $ v 020, 14:18:02
S-02 View of seep and SOC sample location facing northeast.
Page 2 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
S : w W
180 210 240 270
• I • I • I • I • I • I • I • 1 • I • I • I • I I • 1
c 224°SW (T) OO 35°13.202'N, 81°45.465'W ±45ft • 683ft
41.
,gig �„•,
_ P
• f
,
4.
♦ _ (_
y x
S-03 View of seep location facing southwest.
Page 3 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NW N NE
0 300 330 0 30
r: 342°N (T) OO 35°13.061'N, 81°45.162'W ±16ft ♦ 648ft
t
1, 1,14. `
7, I
i
ii.4 1
r ,
1►
,
4 > ; w
s
4 i'.
1
f r
'r r 8
t
Outfall 104
View of NPDES Outfall 104 facing north-northwest.
(formerly S-04)
Page 4 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NW N NE
300 330 0 30 60
• 1 • 1 • I • 1 • I • I • i • I • 1 • I • I • I • I_ • I
0 353°N (T) CD, 35°13.083'N, 81°45.078'W ±32ft ♦ 642ft
f
/
.d fir +-Aw
7
1- - .?-'
•
d4 7 ,ter wY"
1 ,, 11 .fir a-
.- :�- .. .• ,' it p+f 4d' Y.'"" - ."'+fin
�.- H - _ /
,,. , r .t. .t j r "".. �4 • xa. ,.+ a .,*. -.
,,,..4,4.,' 7:‘,.!IN_ ',' ;i64.4 -16 4, 4"4"',, .t. ir.' 7 " -1- „...1,___-:-. .'
� i_ f
; *"
" - .,- +- Y r `''- 30 Mar 2020, 18:15:22
S-05 View of dispositioned seep location facing north.
Page 5 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NW
N
GO 330 0 30 NE
60 00 1
• 1 • 1 • 1 . 1 . 1 . 1 . 1 . 1 . 1 . 1 . 1 . 1 . 1 . 1 . 1 . 1 . 1 . 1 •
0 25°NE(T) OO 35°13.1061N,81°44.899'W±32ft A 672ft
t 1 1 - 4 «
,-
t
I
1
l'P)'''
,*' k s ` 30 Mar 2020. 18
t'...
Outfall 106
View of NPDES Outfall 106 facing north-northeast.
(formerly S-06)
--
•E S S1Y ' W NW .
150 180 210 240 270 300
i • I • I • I • I • I • I • I • I • I • I • I • I • I • I • I • 1 • I ,•, i
0 228°SW (T) OO 35°13.111'N,81°44.756'W ±16ft ♦ 710ft
'" *gy p»
30 Mar 2020 18�0:2/
ram . .
S-07 View of seep and SOC sample location facing southwest.
Page 6 of 55

i
Seep Characterization Report July 2020
DukeEnergyCarolinas,LLC SynTerra
Rogers Energy Complex-Cliffside Steam Stationyn
NW N NE
300 330 0 30
® 344°N (T) OO 35°12.514'N, 81°45.392'W ±32ft ♦ 788ft
v*, 4:• f %� .+ /ice• t—-s i ° !
Ili
K
5 8
$: ,. r .,. .wt
-,
M jk
,. s
'tea.
/_ ,rY9r
``�
,§ 3' ' 1ar 2020, 16:1/119
I
S-08 View of dispositioned seep location facing north-northwest.
,...
Page 7 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
SE SW
120 150 180 210 240
s
0186°S (T) O 35°13.044'N,81°45.243'W ±32ft ♦ 676ft
Id
:*..-44top,::
•
- i
30 Mar 2020, 12:1
S-09 View of dispositioned seep location facing south.
Page 8 of 55

P
Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
E E SE S
60 90 120 150 180
• I • I • 1 • 1 • I • I • I • I • I • I • I • I • I • I
0 114°SE (T) • 35°13.167'N, 81°45.401'W ±16ft ♦ 645ft
" c- + , Fir'
.it •
,.
R X a
-
' R~
is
S-10 View of seep location facing east-southeast.
Page 9 of 55 1

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
W W N_.
270 300 I 330
:..lu. • 1 • I • 1 • 1 • 1 • 1 • 1 • 1 • 1 • 1 • I • I • I
Ct 14°NW (T) OO 35°13.163'N, 81°45.398'W ±16ft ♦ 642ft
_ ;101 ,
..
t .5 moo,
it - _ �p �ti
,
f .,
'')- ,.., d Y^i.' heo. ' — `. .A-.
W.
_. *1 , to- 1
t. A. .a ur f
. °a ➢fib .�
6
s
N� F;1
:* t.l. p ' 1 �Y.'
, R
v+-
r- 30 Mar 202 s
AA
S-10 View of seep location facing northwest.
Page 10 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NW V NE
300 330 0 30 60
1 • I ' I • I • I • I . I • I • I . I . I • I
) 358°N (T) r 35°13.159'N, 81°45.383'W ±16ft ♦ 658ft
6.4
4
S-11 View of seep location facing north.
Page 11 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
.w W NW N
240 27 ; 0
• 1 • 1 • i • I • 1 • 1 • I . 1 . I • I
0 293°W (T) 035°13.162'N, 81°45.390'W ±16ft A 653ft
0011 .vier
h l i"" -om'
1154
,Moa
,.. : t , t •R � ;..
,
4 t
A / ,
k tir
ts
ti „ F
441 I, ,,., ,, . ,‘ . _ .1 1 44::
'-,.
s1
MO7. '
,. ,,F 020, 11:44:30
5-11 View of seep location facing west-northwest.
Page 12 of 55

i
1 2
Seep Characterization Report July 20 0
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NW N NE E •
300 330 0
I • I • I • I • I • I • I • I • I • I • I • I • I • I 1 • I • I • i •
012°N (T) 40, 35°13.053'N, 81°45.121'W±16ft • 699ft
11 $tki*# •t M, is
i
-iota / : � w.
-,.' 1,- - --tr. - . • ...,,„..,,-_ . , - ' , 7,.. 0.2: t-- -‘1, A, 1 4*, ' '
't `fir. : �•' r; 4 \ --
4,
S .._,,:... ,.., ,. ' ,\ • >x**.
� S
. - ...r-- _-_ , .,, „ ., r 4 iti'";.167,1" ''..,,,_"t'')p.,!...7.-• " ,
.4 , ,
S-12 I View of dispositioned seep location facing north.
Page 13 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
a 180°S (T) • 35°13.055'N, 81°45.116'W ±32ft ♦ 668ft
sic
N'
11
. 1.4) -111 it'''';‘110.. ".rr-..:*--1.7,47,r; fgAgiv,,,:l ,,..„,":-' ....4.---"to.':-;1,40,14 , ' W.‘,..,:.. ,,,,„..“ '''' .„ 1„,'") .,,v!,,,,,,,-.
- 16'. .twt �F� ��' . , 1 yam\ _
a
a `t'''i{t� ;},,` ate k, '` `� {w f, ," •A -=,aye
..tie : Tt- y`t'>:� l'tilt ' xg d "4 +E `�.'91 „, ?,�*' al fit, w.
s.
1,,,,,
t: i *k 41 ,f ,41 . ./*.T. Yl -/ « r -r. yet. -' \
- ma ~, ` �' ,,IC� '. 1R► r "a.
t„ s Mt 5,::i .,, Y'w�41 * <,.. t PPP, • .
t
f' 4 /1h y �t . 30 ivig- 202-0, 1 5 _
S-12 View of dispositioned seep location facing south
Page 14 of 55

I
Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
w N NE E
330 0 30 60 90
• 1 • I • I • I • I I • I • I • I I • I • I • I • I
® 23°NE{(T) 0 35°13.107'N, 81°45.300'W ±16ft ♦ 676ft
fm)fiiii
,r y V., ,. if,..e .• '5 'm* r,,-, .,4Airt:it*r
It , .,y4" lit ....1'..‘e
a ` • �..
l
O� Y'RJ 8Y S • ' r6'
� i«• �� ii.
' i b. i #
jimeterk
4 k i''' A .:,..., ' •
) -4 rik4-
., ,„ , , ,„,....,... ,
„I. i, k Y
Ili'
' A.
4 30 Mar 2020 +12:01:40
Y 2. 4 a ? M 1 i ti
S-13 View of dispositioned seep location facing north-northeast.
Page 15 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
W NW N
270 300 )30 0 30
r i • I • I • I • I • I • I • I • I • f • I • I • I •
0 0 o
0 327 NWT 0
35 12.867 N 81 4 4_ ( ) 5 3 3 W ±32ft • 741ft
r", + A .... 'apt , �. '. _ t,
A
.k ,Y. r
{ aW. • .r ...e.,
- '. A. �` 4.- .4 S-A 4
7
a.7
t'
1
I
1
1
J
Re., 30 Mar 2020. 17:23:38
S-14 View of seep location facing northwest. 1
f
Page 16 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
SW W NW
240 270 300 330
• I • I • I • I • I • 1 • I • I • I • I • I • I • I • I
® 284°W (T) * 35°12.858'N, 81°45.362'W ±16ft ♦ 745ft
. r
S-15
pp4 `% - •
saknr 4
4.
Oki
t ,.e aI 3tp. ;n'
,. h ':',t. `:/' '. _ $
' 41( ,� 'f
4' ' ' g5 � � 4'� '1 / K AAAy¢t {- .y
t } y
1r£ P..
'
kRt a`' , n i i t
•
' 1... 7
tt
30,�v1 r Z02te'r0, 17'20.36
--- _4 - -
S-15 View of seep location facing west.
Page 17 of 55

SeepCharacterization Report July p Y 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
SW W NW N
240 270 300 330 0
® 292°W (T) ;i 35°12.858'N, 81°45.364'W ±16ft ♦ 726ft
1
k.
a r
a.. y. ,x " e y x
Y
rir it ,
•, x
/ r
�- f.=
' �,.
• .,ti�i 2:
a r04,_ s
r
4 �.' s ,
Mar 2q t`' . :30 1
S-15 I View of seep location facing west-northwest.
Page 18 of 55

r
Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
W NW N
240 270 00 330 0
I • I • I . I • I • II I • I • I • I • I •
0 297°NW (T) 4. 35°12.847'N, 81°45.363'W ±16ft ♦ 748ft
-. ,� I
.0 VV.
-16
c
• ® n
r -
�y
O ',. " -. "E` t'..
—1'11
3 t- - err
.
' ar"
` � '• 30 (Mar 2020 7.18.32''
S-16 View of seep location facing west-northwest.
Page 19 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
SW W NW
240 270 300 330 I
I • I • I • 1 • I • I • I • I • I • I • I • I • I • I • I
® 290°W (T) • 35°12.849'N, 81°45.368'W ±16ft ♦ 735ft
6 < '
i .
rs ;
, slit
, e' > . a,.
, ")...'"..t„ . :'4
/ :•toms
�[y ,fps f+
a.p
•
S-16 View of seep location facing west-northwest.
Page 20 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
SIB,' W NW N
240 330 0
I • i • I • i • 1 • i • I • I • I • I • i • t • I • I • ! I • 1 • 1 • 1 •
0 294°NW (T) • 35°13.033'N,81°46.156'W ±32ft ♦ 643ft
aw
116.
4
30 Mar 202IA 4 15.09
S-17 View of dispositioned seep location facing west-northwest.
SE S SW W
120 1SO 180 10 240 270 301
• I • i • 1 • 1 • 1 • i • I • 1 • 1 • 1 • 1 • 1 • 1 • 1 • 1 • 1 • 1 • 1 • 1
0 207°SW (T) • 35°13.041'N,81°46.159'W ±16ft ♦ 692ft
•
30 Mar 2020.09:59.15
S-17 View of dispositioned seep location facing south-southwest.
Page 21 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
W NW N N
270 300 330 0 30
• I . I • I • I • I .
0 335°NW (T) • 35°12.989'N, 81°46.102'W ±16ft A 664ft
•
�an j
r w
.a
yy
qq
5y
p .*f
aR
?_ r
)
y „ p 30 tar 2020, '1-. 0
S-18 View of seep location facing north-northwest.
Page 22 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station Duke Energy Carolinas,LLC SynTerra
W NW
N N,
270 300 330 0 30
1 • I • I • I • I I I • i • I • I • I I •
1 •
I •
336°NW (T) U 35°12.986'N,yy81°46.119'W ±16ft p♦ 672ft
: ,..,,, l..„,...... \k, ,. ,tittoStjt;; ,firV4iN,t''''
� K ..V `,4'
�� r ,
, 7
0'
- .1.:.`0°'''‘ • /`4t; '''''''.4C`,";7-'1i
9 -
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x
t �r�f_,,,,,,er/ )
`
v
117
•
¢gyp '�' y. ^rtR w �r. �♦e '�.
,M.`K' � 4` t tr ... 4.
S-19 View of seep location facing north northwest.
Page 23 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NW N NE
0 300 330 0 30
• 1 • I • 1 • 1 • i • I • 1 . I
342°N (T} a 35°12.989'N, 81°46.143'W ±16ft ♦ 686ft
vt g
ti
, 4 ,',,'
0
k,,' ,9
y' y 4R?a. 4 , i
m.
4 i:e 41,E P 3 P{ w `
,,tea ����. +TP• � � �:
as .+4, .. , `?`5" '^,.
30 Mar 2020, 14 1+�"
S-19A View of seep location facing.north-n rthwr4t.
Page 24 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
S SW W
150 180 210 240 270
• •I I • I I I • I 1 • I • I t I I I
® 215°SW (T) OO 35°12.963'N, 81°45.913'W ±16ft ♦ 715ft
rR
p
p r a
401
ti
a wl Y
S-20 View of dispositioned seep location facing southwest.
Page 25 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
SV W NW N
270 300 330 0
• I • I • I . 1 • i • I • I • I • I • I • I • I • I • I • I • I . 1 • I •
295°NV» (T) J 35°12.878'N,81°45.356'W±16ft ♦ 706ft
Aar
S-2.1 H
;.'e a *'.
Lip .to
S-21 View of seep location facing west-northwest.
NE E SE S
30 -C' 90 120 150 8U
• 1 • I • I • I • I • I • I • I • I • I • I • I • I I • l • I i I •
0 97°E (T) %- 35°13.072'N,81°44.898'W ±16ft A 668ft
4 «
30 Mar 2020, 18.42:22
•
S-22 View of dispositioned seep location facing east.
Page 26 of 55

Seep Characterization Report July 2020
Rogers Energy Complex Cliffside Steam Station Duke Energy Carolinas,LLC SynTerra
E SE S SW
90 120 150 180 210 240
• I • • I • I • ! •
173°S (T) Q 35°13.082'N,81°45.031'W±16ft ♦ 651ft
,
z .� . .: _'a.a'.
..� *
t,
yaw �.` �..�,�/�df 2�2U, ��0
S-23 View of seep location facing south.
Page 27 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
W NW N N•
270
300 330 0 30
1 • i • (p ; 1 • 1 1 • I • 1 • 1 • I I • I • I • I •
® 337°NW (T) OO 35°13.071'N, 81°45.021'W ±32ft ♦ 658ft
116
4 k•. ,y
•
s 3
S- ,3 View of seep location facing north-northwest.
Page 28 of 55

Seep Characterization Report July 2020
Rogers Energy Complex Cliffside Steam Station Duke Energy Carolinas,LLC SynTerra
S sv W
180 210 240 270 31
I • I ! I • I • I •
i I I • I • I • I • I • I
®229°SW (T) C� 35°13.088'N, 81°44.976'W ±98ft ♦ 663ft
1. ifµ F tSL p- nt C Jf�QF*' I'" '!. W
st
w a ` "yam'of 'rM. s„ +S 'a. _ fix.'.,'. '"" ' " "r
•
"A.
. i..yam 1
r' x x• "wz,.: dad "p a'" ai"
i `.. • . • 4 : r 7^sue"/
m -_I-,',
. `.,1.,,1A -,
w 4 *y .b xy y
rt ` t • #. *; `+fie,T�1°" < j�`�. YFY"
ti •
q Ar r ,'';. 'd tea „
,
��� $ i@,Y-�.,,,.u.,�, < yam, � 1 _tS7 ��.
A
" At v w.
f c
�" k
•
• . v�
� Mil ti# ' � Q Mar 2Q 0, 0�~()8
S-24 View of dispositioned seep location facing southwest.
Page 29 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
S SW W
15( 1<i) 21 C 21i) 2/1
I • I • I • I • I • I • I • I • I • I • I • I • I • I •
0 218°SW (T) O 35°13.108'N, 81°44.975'W±98ft ♦ 669ft
•
- ^z, 1"
4,
\\� t 4 t �j r +
I t - ''''''4?: ** Ilk i ' r - I,-, ip„l
.44 rxi
\
S-24 View of dispositioned seep location facing southwest.
Page 30 of 55

f
Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
N NE E
33U 0 30 60 90
® 34°NE (T) n 35°13.057'N, 81°45.137'W ±32ft ♦ 690ft
: A.0
.W
S-25 �� t
/i;:,, �
Ai
Rtt
w\
tia ./"'i Tii d o � 4' 1 1' 7
/ .ir IF"'
4
,,,,, ...,, , ,.,,.... ,..t ,
'..---... _____1,„.../:"..0.,:, i \ i f,____..)6t.>N
itk ' i ' - N,
,,, , ,
, , -„, - ,,,,,„, -
•,,,,,,,,,,,,
4\
;,,,-,,, ----, f 3I - ., .* ",, -',a
:tit .
S-25 View of dispositioned seep location facing northeast.
Page 31 of 55
L

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
Nit ,
- - NE E
330 0 30 60 90 i
I • I • 1 • I • 1 • I • 1 1 i .
• • 0 • I • I • I • I • ,
) ,
0 27°NE (T) • 35°13.057'N, 81°451._)2W ±16ft A 693ft
,,- ', •
' ' 0
tr ,°`, ''''',1' 4° • / ,i:a4,e'.
'-1.J,\\ .;.. n?3, '''''.....,...!>.:- • . , , .
,...,,,,... ,•'r 41.“''.'.,2 -4.•.,- .:.° , ',,,, -
,
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-
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--. ,4 ,-.4 \ i -, - -'• . t et '* „ . , (...,
* 4- . ‘:4 e
t"--.S. ' "444 3;_!...;1',1. .,, ei, „4, ,• , •
if....e i,'.,.,',.'•,,,,,...-; Aerh•.%1'...rii .6**-4 . '• , ,.
' ., ' 't-.. ' 4 ' , ft, • ,,
Ps "fir
, n -1I /,.,„Ii..-4qi‘.--r4:,,,,s/t q"..0•,'l'•-,..t,i.,-4liv,.4,0k4-;.•.,--,.:,.,l.,..14_A-4 sti,,,,t,ox,. '.•,.', ,14I- 4tt;-,-•I•, .i 4",1
, .40 . 1ki41.4t, . .
, '•
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' i. N '4 • % Cj - : „,,,,,,,,.,,4I..t,:`_1f-'i•t,..t-7i,,,., ,,..A,v ,..,
•
7 it
l'.'74,*,, I... 'A.4 PI-(:•4 'ilit,--,*:. ," ,,.. '
,p :1..,..,.'1 /,
- . t
,' -,4.- :. - 4 .le `•
, .. .
—
.e Mar 202 eltis'
•
.......;,.., , ,3
, • 43 ‘
S-25 View of dispositioned seep location facing north-northeast.
Page 32 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NW I I NE
300 330 30 60
I • I ' I • I ' I • I • I • I • I • I • I • I • I • I •
0 360°N (T) • 35°13.061'N, 81°45.228'W ±16ft ♦ 690ft
ti ae, y.
*
S Y' '.i
:- , �! ' 7-, '
. - • `AA, , --p., ,ii,,,,,.... ...,
v., ,- ,A.-lfr . ,..--044,14.
.44 _ 4 \\
. ' . 401,1,4'' -'-''''.‘4''.4....„„, ; ,:--# ,,,,'"--,g, Yellikitik,.., _....e: ,-
Utz `" '.f` 1 op
i ° —
°#: .Nrl' . " asps.,
30.Mar 2020, 12:23:32
S-26 View of dispositioned seep location facing north.
Page 33 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
SE S SW
120 150 180 210 3
I • I • I • 1 • I • I 1 • 1 • I • I • I • I • 1 • 1 •
0166°S (T) '• 35°13.055'N, 81°45.228'W ±16ft ♦ 680ft 1
y ..
a -�- '
` r.
,,,,,, 44,:::::.,:,,,,i ,, , .,-„ ,' . - ,
4'^ ti
i
c
Vt,*, \,.,, _ .,.,,,..i.k:. :,..:400. 1 ,voit, ..5i: . , - Ne -1. ;
F.
kg�'
-
, 30 Mar 2020', 12.24:12
S-26 View of dispositioned seep location facing south.
Page 34 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
W NW N
40 270 300 330 0
I • I • I • I • I • I • I • I • I • I • I • I • I • I • I
° 35°12.835'N, °
0 310 NWT 0 81 45.384 W ±32ft • 710ft
rtfi
U
'
�•. ��"''`
S vle .4
`
' r
7 fit f 0` 4 `
-, Y
r ,
y h
V .�• ♦ `�
r ".
e r
!�4.° "bra �n y r-ro +' ,',"pq 41 „y , 1
41
`4,,,..8.0'' ' : , ' .f,,'''. .., ' , "''. '‘. :kii:*14t140, '*,1e, 't If 0,''''',.'' 'irci40:1 '''' ":" ..,'1
30 Mar 2020, 17:15:33
ataw
.-27 View of seep location facing northwest.
Page 35 of 55
i,

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
S SW W N
180 210 240 270 300
I • 1 • I • I • I • I • I • 1 • I • I • I • I • I • I • '
0 246°SW (T) it 35°12.698'N, 81°45.244'W ±16ft ♦ 770ft
I Sao- At
r ,0(
1Vg:14.1*,:i
;f
l ,),N, r•'
iIAlb
• • ,+ z�.
•
. 1 �,0,,...,:. .... .
•
' -L
s
14 ; ;r 04; - _',-• < > / '� .8�
7 - 30- 'R
S-28 View of seep location facing west-southwest
Page 36 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NW N NE
330 0 30 60
I
• I • I • I e I e 1 e I e I • I . I a I • I • I •
0 18°N (T) * 35°12.698'N, 81°45.247'W ±16ft ♦ 759ft
',_ y' i ,`
* q,■ y4 �•. ; ,' r A
1.
7
, d . j
. ,
` • wr> f I z r
_ « .k i slots 3` 10`r,_a pt S•,., s 'q..,'
7J
' z
a4'` 'r il►/ its
o A 4n� {}'
e r
1,4 � A jai r ssr ,,
Iiiktv:".0
�''s + `�;.+.���f!y�}'��; y `ter �,��1� �1 �)_. t It'' � .' v.ems
-141,411L
ems/✓'" ) - r -'; y-
Pt 4. r ii+t' ��r,' •,f axa •\ • *`A+, k sat .• ;
tit
. , lb .,�
z a
�
�Y w
` ' / A' �' . .
'If / .
S-28 View of seep location facing north.
Page 37 of 55

SeepJCharacterization
C a acterization Report ul 2020
Y
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
SW W
NW
I
240 270 300 330
282°W (T) OO 35°12.693'N, 81°45.240'W ±16ft A 750ft
t r ' ,f ; . . � a'.
-.,,� "- ate, ,. `' j+ 3 it
1■
__ „, , „ ,„..,,, ,:„,,„...
, _ ..i- :
1,,,, , ..,.)4"
,, .4'0,. n' 4' t .A , . t ..' 4
Alaid
.44 (
)1
P yP � r tl i
V
i, *. 1 �
..„ . , 4-\54! lik... ,A.,, v i . ,
, ' ' -. - % 1 .-r‘,.*44WN.7.1, if s'
\. ' , - '' , '" 'WWI
$ 0 t .r ' p
S-29 View of seep location facing west.
Page 38 of 55

I
Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NW N NE
'0 300 330 0 30
• 1 • 1 • 1 • 1 • 1 .. 1 • 1 • 1 • 1 • 1 • 1 • 1 • 1 • 1
0 341°N (T) OO 35°12.694'N, 81°45.241'W ±16ft ♦ 743ft
,yam r _. ,.. _ ;r
} y i'r- ` tea{ -
I
t,,,, _ li,+� s
'a# 4' ro s. ' ' 1 may,
4i. ..,...4.,,,,,"4•1Pf4:1„.,,,,-,4.-, -',,t. ,, _4,-4 !#,,, :A , .117:
40: i 1 w 0"- '
:• 4 ' iy r
'` [ as.. s ( . D ..
� s �4- k ,tl.' a`
5- f
Cr
i • It
r
rid
.r
r '
I at: +sit \ • i+ ' `1,4
gichb,
i .,
1 t '1,4--: 30 Mar 2 0,, .02.26
S-29 View of seep location facing north-northwest.
Page 39 of 55
l

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke EnergyCarolinas,LLC SynTerra
Yn
SW W NW
210 240 270 300 331
• I • I • I • I • I • I • I • I : ., Y • 1 • I • I • I • I I
0 262°W (T) OO 35°12.691'N, 81°45.249'W ±16ft A 815ft
! i s OW'': ��
fe I
!
...4,... ,A, , ,
4
* w �
op �l
% 1m . {Fy r ° , ITS,!/'
,,,,r, ei ,i'',;I ", <.'" 0 .7.16,
i.i
' S' • �e'%i', ' ( ` 1 \- i s , ,,r--. •
7
r , / —
L},. / ,•�N dV. * `. i,„ ,i a� `\ I r�x y 4
�7 y ;' }
..4 ,it ,. -....: - , ,
. ..., . ,
P . ..
• ' y
., i-ir-
, -,- f e. 11.7: , N 1-1.44, ii, •'''..,
410' '44 ,--:.,te, --,-,,,,o, 4.., ,..44 .0,6„ __-_ , , ,i ,,,, ..,r, A..
4•ems, .11,wr: ";'Y �a °i!
3 - ram' ,,e.K.-:. 4. . 't, '�"'t "4', _ . �+. , r'. `r,,,
sir1� 441, , � . k
I,
,
T
4
.•1 a
S-30 View of seep location facing west.
Page 40 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NW N NE E
33G 30 60 90 120
I • I • I . 1 • I • I • I • 1 • I • 1 • I • I • I • 1 • I • I • 1 • 1 • I
®40°NE(T) OO 35°12.690'N,81°45.244'W±16ft •761ft
C wS
� _ w
S-30 View of seep location facing northeast.
Page 41 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
S
E SE
150 180
60 90 120
I • I • I • 1 I I • I • I • I • I • I i I • I .
0129°SE (T) O 35°12.684'N, 81°45.231'W±32ft ♦ 761ft
i l L . ,,
c
A ._,...„
�dv 4%� t;
. -
pi, ", •• fib a yy A~ ,
\I
s
+: 't . ' t irie°', - '''' s 4 , \
' l. .7 ^i. �_rcd �
= - a ,r. y „ a'''''' . �y*'"+' ce.' : * i�� ✓ 30 Mar 2020r16 b6:3
S-31 View of seep location facing southeast.
Page 42 of 55

Seep Characterization Report July 2020
Rogers Energy Complex Cliffside Steam Station Duke Energy Carolinas,LLC SynTerra
E SE S
60 90 120 150 180
I • I • 1 • I . I • I • I I I I I i 1 I •
0 128°SE (T) O 35°12.677'N,81°45.212'W ±16ft ♦ 784ft
'Ap
K
3 i
�
fir. +' �•
,•'• :3, r
Rs q '
_i
S-32 View of seep location facing southeast.
Page 43 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NE I` ,
,.
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0 75°E (T) .I 35°12.676'N, 81°45 212W ±16ft • 779ft
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S-32
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Page 44 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NE E SE
c,u 90 120 150
I • I • I • I • I • I • I • I • I • I • I • I • I • I •
®87°E (T) 0 35°13.096'N, 81°45.287'W ±16ft A 664ft
-,Y� A1,
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S-33 View of dispositioned seep location facing east.
Page 45 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
E SE S
90 120 180 210
. 1 . I . I • I • I • I • I • 1 • I • l • I • I • 1
0 143°SE (T) • 35°13.061'N, 81°45.222'W ±16ft ♦ 685ft
I ..��.. 14
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30 ar"2• .! ►f4-,
S-34 View of dispositioned seep location facing southeast.
Page 46 of 55

i
Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
N NE E sE
0 30 60 90 120 150
• I • I • I • I • I • I • 1 • I • I • I • I • I • I . I • 1 • I • I • I • I
0 78°E (T) OO 35°12.482'N,81°45.378'W±32ft ♦ 870ft
c.4 _ ' , ,''.• __r � , ^r.'"r-'' ✓ A.O.W .`
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S-35 I View of dispositioned seep location facing east.
Page 47 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NE E SE
30 60 90 120 150
I • I • I • I • I • I • I • I • I • I • I • I • I • I •
0 99°E (T) O 35°12.620'N, 81°45.233'W ±32ft ♦ 765ft
V4 • :. -, = ' .7, -itr-, .4x-- . ,,,,_ - -Or ,
f '" •
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iliw
t .30 Mar 202 16:23
41
S-36 View of seep location facing east.
Page 48 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
E SE S
90 120 50 180 210
0147°SE (T) OO 35°12.619'N, 81°45.233'W ±16ft ♦ 801ft
/
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dry"4,
ti
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16.2 3.51,
S-36 View of seep location facing southeast.
Page 49 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
�. dSE S SVV
120 150 180 210 24.
• 1 . 1 . 1 . I • I • I • I • I • I I • I • I • I I '
O 172°S (T) ' ) 35°12.612'N, 81°45.222'W ±32ft ♦ 744ft
t i ` i { �.■a 'L if. d f4tN`°aL ''y Y* i
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�' : , 30 Mar 2020, 16.25:03
S-37 View of seep location facing south.
Page 50 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
SW N NW
210 240 270 300 330 t'
I • I • I • I • I • I • I • I • I • I • I • I • I ♦
0 267°W (T) 4.1 35°13.0611N, 81°45.169'W ±32ft ♦ 661ft
a� +�N�..11�. .P ;
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30 Mar 2020, 18:29:28
S-38 View of seep location facing west.
iz
Page 51 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
��+. S 1
8 210 J W
240
g
0 227°SW (T) • 35°12.804'N, 81°46.431'W ±16ft ♦ 764ft
e. « ,. Ids .
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1 5-39 View of seep location facing southwest.
Page 52 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NE E SE
60 90 120 150
• I • I • I • I • I • I • I • I • I • I • I . I •. I • I
0103°F (T) O 35°12.813'N, 81°46.434'W ±32ft A 746ft
4 3a 9r1
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S-39 View of seep location facing east.
Page 53 of 55

Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
N _ N E __� E
0 3U 60 90 120
• I • I • 1 • I • 1 • I • 1 • I • 1 • 1 • I • 1 • I • I
0 53°NE (T) ',J 35°12.812'N, 81°46.439'W ±16ft ♦ 766ft
,:,. :":1;,, - --''' .. ',LVi':r,'-'4"r7,•-2.:;:,4*,';":f-t4E:*1,--' °,':-71, .,-*=-„..'''.::::'.;:7''' -' - -
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5-39 View of seep location facing northeast
Page 54 of 55

i
Seep Characterization Report July 2020
Rogers Energy Complex-Cliffside Steam Station-Duke Energy Carolinas,LLC SynTerra
NE E SE ;,
30 60 90 120 150
I • I • I • I • I • I • I • I • I • I • I • I • I • I •
® 99°E (T) I 35°12.801'N, 81°46.434'W ±16ft ♦ 755ft
sr' g" 1 r s.4 4i 'I.
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S-39 View of seep location facing east.
Page 55 of 55
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