1812_DukeMarshall_GWR_Q4 2021_GWR_FID1772637_20220131

(� DUKE
ENERGY
January 31, 2022
North Carolina Department of Environmental Quality
Division of Waste Management
Solid Waste Section
1646 Mail Service Center
Raleigh, North Carolina 28778
Attn: Ms. Sarah Moutos (submitted electronically)
Re: Groundwater Condition Quarterly Report — October 2021 through December 2021
Industrial Landfill No.1
Permit No.: 1812-INDUS-2008
Marshall Steam Station
Terrell, North Carolina 28682
Dear Ms. Moutos:
526 South Church St.
Charlotte, NC 28202
Mailing Address
P.O. Box 1006
Mail Code EC 13K.
Charlotte, NC 28201-1006
717-982-0986
In accordance with the NCDEQ DWR September 17, 2021, Phase 2 Permit Modification Approval letter, Duke Energy is
providing the quarterly report describing groundwater conditions in the area of the Marshall Steam Station Industrial
Landfill No.1 (ILF, 1812-INDUS-2008) Phases 2, 3, and 4. The report was prepared by SynTerra on behalf of Duke
Energy. The report is for the quarterly period of October 2021 through December 2021 (Q4 2021).
The quarterly report includes an analysis of groundwater levels and dewatering pump flowrates within Phases 2, 3 and 4,
with updated water level maps, hydrographs, pump flowrate plots, and well construction and water level data tables. An
evaluation of groundwater levels and pump flowrates to determine whether model predictions are being met is included.
All groundwater transducer data, groundwater model trend data, and dewatering pump data are provided in an excel file
format as the report Appendices.
Groundwater conditions in the vicinity of Marshall Steam Station's Industrial Landfill No.1 continue to be monitored and
evaluated. The next quarterly report (Q1 2022) will be submitted by April 1, 2022.
If you need additional information regarding this submittal do not hesitate to email or call me at Ashlev.Albert(a)duke-
energy.com or [phone].
Respectfully submitted,
j4l_�Ai
Ashley Healy, P.G.
Environmental Services
Attachments: Industrial Landfill No.1 (1812-INDUS-2008) Groundwater Conditions Quarterly Report — October 2021
through December 2021 (SynTerra; January, 2022)
Appendices in excel format:
1) Appendix A Water Level Monitoring Data Files
2) Appendix B Groundwater Model Predicted Trend Files
3) Appendix C Dewatering/Underdrain Pumping Data Files
cc (via e-mail): Claire Osborn, NCDEQ
Elizabeth Werner, NCDEQ
Kyle Baucom, Duke Energy
Chris Varner, Duke Energy
Jim Malloy, Duke Energy
Tyler Hardin, Duke Energy
www.duke-energy.com Page 1 of 2

Ed Sullivan, Duke Energy
Thomas Colton, SynTerra
Craig Eady, SynTerra
www.duke-energy.com Page 2 of 2

LIP
synTerra
Science & Engineering Consultants
synterracorp.com
INDUSTRIAL LANDFILL NO. 1
(1812-INDUS-2008)
GROUNDWATER CONDITIONS QUARTERLY
REPORT - OCTOBER 2021 TO DECEMBER 2021
FOR
MARSHALL STEAM STATION
8320 EAST CAROLINA HIGHWAY 150
TERRELL� NC 28682
FEBRUARY 1� 2022
PREPARED FOR
(� DUKE
ENERGY.,
DUKE ENERGY CAROLINAS,, LLC
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Kathryn W. Webb, LG Thomas Colton
Senior Peer Reviewer Project Manager
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Craig Eady, NC LG #1599
Senior Project Manager

Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
TABLE OF CONTENTS
SECTION
PAGE
1.0 INTRODUCTION.........................................................................................................1-1
1.1 Objectives and Purpose............................................................................................1-1
1.2 Key Findings..............................................................................................................1-1
2.0 QUARTERLY MONITORING RESULTS...............................................................2-1
2.1 Current Groundwater Conditions.......................................................................... 2-1
2.2 Groundwater Trends................................................................................................ 2-1
2.2.1 Water -Level Hydrographs.................................................................................2-3
2.2.2 Dewatering and Underdrain Pump Performance..........................................2-6
3.0 QUARTERLY WATER -LEVEL REDUCTION ACTIVITIES ............................... 3-1
4.0 REFERENCES................................................................................................................4-1
LIST OF FIGURES
Figure 1 Monitoring Location Map
Figure 2A Sitewide Water Level Map — Upper Flow Zone (November 2021)
Figure 2B Area of Focus Water Level Map — Upper Flow Zone (November 2021)
Figure 3A Water Level Hydrographs (GWA-04S/D, ILF-02S/D)
Figure 3B Water Level Hydrographs (MW-04/D, MW-07 (OB-3))
Figure 3C Water Level Hydrographs (CLF21-10, CLF21-11)
Figure 3D Water Level Hydrographs (CLF21-12, CLF21-13)
Figure 3E Water Level Hydrographs (CLF21-14, CLF21-15)
Figure 3F Water Level Hydrographs (CLF21-16, CLF21-17)
Figure 3G Water Level Hydrographs (CLF21-18, CLF21-19)
Figure 3H Water Level Hydrographs (CLF21-20, CLF-UD)
Figure 3I Water Level Hydrographs (CLF-301, CLF-302)
Figure 3J Water Level Hydrographs (CLF-303, CLF-304)
Figure 3K Water Level Hydrographs (CLF-401, CLF-402)
Figure 3L Water Level Hydrographs (CLF-403, CLF-404)
Figure 4A Cell 5 Pumping Flow Rate Vs. Simulated Flow Rate
Figure 4B Cell 6 Pumping Flow Rate
Figure 4C Phase 3-5 Pumping Flow Rate Vs. Simulated Flow Rate
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Groundwater Conditions Quarterly Report - October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
LIST OF TABLES
Table 1 Groundwater Monitoring Network Well Information and Water Levels
Table 2 Site -Wide Water Level Elevation Data Table
LIST OF APPENDICES
Appendix A Water Level Monitoring Data Files
1. Submittal Data - Locations CLF-301, CLF-302, CLF-303, CLF-304,
CLF-401, CLF-402, CLF-403, CLF-404
2. Submittal Data - Locations CLF21-10, CLF21-11, CLF21-12, CLF21-13,
CLF21-14, CLF21-15, CLF21-16, CLF21-17, CLF21-18, CLF21-19, and
CLF21-20
3. Submittal Data - Locations GWA-41), GWA-4S, MW-7(OB-3), ILF-2D,
ILF-2S, MW-4, and CLF-UD
Appendix B Groundwater Model Predicted Trend Files
1. Submittal Data - Locations CLF-301, CLF-302, CLF-303, CLF-304,
CLF-401, CLF-402, CLF-403, CLF-404
2. Submittal Data - Locations CLF21-10, CLF21-11, CLF21-12, CLF21-13,
CLF21-14, and CLF21-15, CLF21-16, CLF21-17, CLF21-18, CLF21-19,
and CLF21-20
3. Submittal Data - Locations GWA-41), GWA-4S, MW-7(013-3), ILF-21),
ILF-2S, MW-4, and MW-41)
Appendix C Dewatering/Underdrain Pumping Data Files
February 2022
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Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
CCR
CY
Duke Energy
DWR
Future Phases
ft
GPM
ILF
NCDEQ
Report
reporting period
Site
February 2022
LIST OF ACRONYMS
Coal Combustion Residuals
cubic yards
Duke Energy Carolinas, LLC
Division of Water Resources
ILF Phases 3, 4, and 5 expansion
feet
gallons per minute
Industrial Landfill 1812-INDUS-2008
North Carolina Department of Environmental Quality
Groundwater Conditions Quarterly Report
Fourth quarter 2021 (October 2021 to December 2021)
Marshall Steam Station
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Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
1.0 INTRODUCTION
1.1 Objectives and Purpose
SynTerra prepared this Groundwater Conditions Quarterly Report (Report) on behalf of
Duke Energy Carolinas, LLC (Duke Energy) to document the water -level monitoring
data and dewatering/underdrain pumping records in the vicinity of the Industrial
Landfill No.1 (Permit No. 1812-INDUS-2008) at the Marshall Steam Station (Site). This
Report is prepared in response to condition #3 in the North Carolina Department of
Environmental Quality (NCDEQ) Division of Waste Management (DWM) September
17, 2021, Phase 2 Permit Modification Approval letter.
Data collected during the fourth quarter of 2021 (October 2021 to December 2021) were
used to evaluate groundwater conditions for the Industrial Landfill No.1 (ILF) Phase 2
expansion (includes Cell 5 and Cell 6) and Future Phases. Specifically, this Report
evaluates the groundwater levels, dewatering/underdrain pumping flow rates, and
efforts to expedite the reduction of and maintain groundwater levels near the ILF
during the reporting period.
1.2 Key Findings
Key findings of the evaluation conducted during this reporting period include:
• Based on trend data, groundwater levels from December 2021 continue to
decrease in 20 of 26 monitoring wells and piezometers located within and
surrounding the Phase 2 expansion. The piezometers within Phase 2 continue to
decrease but are becoming stable as the Cell 5 Underdrain maintains
groundwater levels.
• Construction has generally slowed down for the landfill expansion, primarily
due to winter weather conditions. As a result, ash basin coal combustion residual
(CCR) excavation activities, and therefore dewatering operations, for the ILF
Phases 3, 4, and 5 expansion (Future Phases) area have also slowed down due to
limited air capacity within the current active ILF Phase 1, and reservation for
production ash. However, groundwater levels continue to decrease, with
observed rates of groundwater -level decrease consistent with the model
predictions at 12 of 26 monitoring locations and rates of groundwater -level
decrease occurring faster than model predictions at 8 of 26 monitoring locations.
Rates of groundwater level decrease slower than model predictions were
observed at 5 of 26 monitoring locations; the water levels in these locations are
less than the model predictions and the construction slowdown is potentially
causing the slow rate of groundwater level decrease. Groundwater levels at 1 of
February 2022
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Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
26 monitoring location (ILF-2D) increased despite model predictions of stable
conditions; this area appears to be outside of the influence of the excavation and
dewatering efforts.
• Dewatering in ILF Phase 2, Cell 5 and Cell 6, and the ILF Future Phases area
removed approximately 7.5 million gallons of water in Quarter 4 2021.
• Underdrain construction was completed and operations began in Q4 2021. The
Cell 5 sump has maintained groundwater levels in the Cell 5 area. Groundwater
levels in piezometers nearest the sump (CLF21-11 and CLF21-12) have stabilized
(Figure 3C and 3D).
• Pumping flow rate from the Cell 5 sump has stabilized. The pumping in Cell 6
was not modeled, but pumping flow rates continue to be stable. The Future
Phases dewatering pumping flow rate continues to increase and generally
follows the model predictions.
• Although ash basin excavation progress has slowed due to landfill construction
and winter weather conditions, excavation of CCR and dewatering within the
footprint of the ILF Future Phases area continues to be a main driver in
decreasing groundwater levels in the area of the ILF.
February 2022
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Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
2.0 QUARTERLY MONITORING RESULTS
The established network of temporary and long-term piezometers and groundwater
wells for monitoring groundwater conditions in the ILF Phase 2 expansion area is
depicted on Figure 1. Piezometer and groundwater well construction information, with
water level and groundwater elevations, for the monitoring network is included on
Table 1.
2.1 Current Groundwater Conditions
Site -wide water levels collected on November 15, 2021 were used to generate
groundwater level maps (Figure 2A and 2B). Water level data and groundwater
elevations are included on Table 2. Observed groundwater levels during this reporting
period indicate:
• Groundwater is generally flowing north to south through the ILF area
(Figure 2A and 2B).
• Groundwater levels within and near the ILF continue to decrease, relative to
groundwater levels from Quarter 3 2021.
• Underdrain operations in Cell 5 have maintained a cone of groundwater
depression around the Cell 5 blanket underdrain sump (Figure 2B).
The shallow flow zone hydraulic gradient for Q4 is consistent with historical gradient
calculations.
2.2 Groundwater Trends
A series of groundwater monitoring wells, piezometers, and pumps routinely monitor
water level and pumping flow rate data trends (Figures 3a through 31). Details of water
level trends and pumping flow rate trends are included in the subsections. The
following are key observations of overall trend data for the reporting period:
• Based on the groundwater level trend data, the groundwater levels in November
2021 have decreased in 20 of 26 monitoring wells and piezometers within,
upgradient and downgradient of the ILF Phase 2 expansion.
February 2022
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Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
• Since July 2021, when close monitoring of groundwater conditions started, the
greatest reduction in groundwater levels has occurred at the following locations,
CLF21-11 (-3.6 feet), CLF21-12 (-3.2 feet), CLF21-14 (-3.9 feet), CLF21-15 (-2.8
feet), and CLF-302 (-3.7 feet). The reduction in groundwater levels in CLF21-11
and CLF21-12 occurred rapidly over the period of Cell 5 underdrain
construction, startup and initial operations (late September 2021 through mid -
October 2021). After several months of underdrain operations, the rate of
decreasing groundwater level trends in CLF21-11 and CLF21-12 have
significantly slowed down. Groundwater levels in CLF21-11, CLF21-12 have
generally stabilized and are being maintained by the Cell 5 sump. The reduction
in groundwater levels in CLF21-14, CLF21-15, and CLF-302 has been steady
(linear) and is related to the continued and focused excavation of CCR from the
ash basin finger associated with ILF Phase 2 Cell 6 and Future Phase 3, the next
landfill phase to be constructed after Phase 2.
• The only monitoring locations with a slight increase in groundwater levels
(ILF-2S/D) are located farthest upgradient of the ILF Phase 2 expansion area. The
groundwater level in the shallow flow zone at this location (ILF-2S) decreased
until mid -November 2021; after mid -November 2021, the groundwater levels
underwent a slight decrease, potentially due to seasonal variations in
groundwater level. This area appears to be outside of the influence of the
excavation and dewatering efforts.
• Construction has generally slowed down for the landfill expansion, primarily
due to winter weather conditions. As a result, ash basin coal combustion residual
(CCR) excavation activities, and therefore dewatering operations, for the ILF
Phases 3, 4, and 5 expansion (Future Phases) areas have also slowed down due to
limited air capacity within the current active ILF Phase 1, and reservation for
production ash. However, groundwater levels continue to decrease, with
observed rates of groundwater -level decrease consistent with the model
predictions at 12 of 26 monitoring locations and rates of groundwater -level
decrease occurring faster than model predictions at 8 of 26 monitoring locations.
Rates of groundwater level decrease slower than model predictions were
observed at 5 of 26 monitoring locations; the water levels in these locations are
less than the model predictions and the construction slowdown is potentially
causing the slow rate of groundwater level decrease. Groundwater levels at 1 of
26 monitoring location (ILF-2D) increased despite model predictions of stable
conditions; this area appears to be outside of the influence of the excavation and
dewatering efforts.
February 2022
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Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
2.2.1 Water -Level Hydrographs
Pressure transducers were installed in 7 monitoring wells and 19 piezometers in
and around the ILF area (Figure 1). A pressure transducer was also installed in
the Cell 5 underdrain sump (CLF-UD).
During the reporting period, 9 piezometers (CLF21-13, CLF21-16, CLF21-17,
CLF21-18, CLF21-19, CLF21-20, CLF-302, CLF-403, CLF-404) were abandoned.
Duke Energy provided abandonment certification records (GW-30 Forms) for
each piezometer to DWM under separate submittals. Data from the abandoned
piezometers collected in the reporting period prior to abandonment is included
in this report.
Pressure transducers are used to record a higher resolution record of
groundwater elevations for evaluation of groundwater conditions resulting from
dewatering. Transducer data in Excel spreadsheets is included in Appendix A in
accordance with permit approval condition 3.c. Manual water level
measurements and transducer records were used to generate hydrographs.
Predicted groundwater level trends from the transient groundwater models were
included in the hydrographs to evaluate how well the models were able to
predict observed groundwater level trends (Figure 3A through Figure 3L).
Appendix B contains Excel spreadsheets with the predicted transient
groundwater level trends for each monitoring location that were exported from
the models. Observations from the hydrographs include:
Upgradient of the Phase 2 Expansion:
Monitoring locations GWA-4S/D and CLF21-10 are located west of the ILF
Phase 2 expansion (Figure 1). Water levels are decreasing at each
monitoring location (Figure 3A and 3C). Shallow and deep water levels at
GWA-4S/D are decreasing at a linear rate. Measured groundwater levels
in GWA-4S are lower than water levels predicted by the model. Measured
groundwater levels in GWA-4D were observed higher than model
predicted water levels at the start of Q4 2021 and decreased below
predicted water levels around late October 2021. The groundwater level at
CLF21-10 reasonably matches model predictions. Decreasing water level
trends are potentially due to seasonal variations in water levels and are
not related to construction activities.
• ILF-2S/D are located north of the ILF (Figure 1). The deep water level
trend at ILF-2D continues to slightly increase compared to the stable water
levels predicted by the model. During the reporting period, the shallow
water level at ILF-2S has started to decrease despite an initial increase.
February 2022
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Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
(Figure 3A). The decreasing water level trend in ILF-2S is potentially due
to seasonal variations in water levels and is not related to construction
activities.
MW-4/D are located east of the ILF Phase 2 expansion (Figure 1). Water
levels in both the shallow and bedrock wells are decreasing at a linear
rate. Measured groundwater levels in MW-4 are lower than the model
predicted (Figure 3B). Measured groundwater levels in MW-4D were
observed higher than model predicted water levels at the start of Q3 2021
and decreased below predicted water levels around early September 2021.
Decreasing water level trends are potentially due to seasonal variations in
water levels and are not related to construction activities.
Within the Phase 2 Expansion:
• Monitoring locations CLF21-16, CLF21-17, CLF21-18, CLF21-19 and
CLF21-20 are located within the ILF Phase 2, Cell 5 (Figure 1). All five
monitoring locations have been abandoned. CLF21-16 was abandoned in
October 2021. CLF21-17, CLF21-18, CLF21-19 and CLF21-20 were
abandoned in December 2021. Water levels prior to abandonment, were
decreasing at each monitoring location (Figure 3F through 3H). The water
level trends for CLF21-16, CLF21-17, CLF21-18, CLF21-19, and CLF21-20
reasonably match model predictions. Decreasing water level trends for
each of these locations was primarily due to excavation of material and
dewatering for construction of the Cell 5 underdrain.
February 2022
A transducer, identified as CLF-UD, was installed to monitor the Cell 5
underdrain sump water level and underdrain operations (Figure 1). The
water levels within the sump demonstrate that the underdrain continues
to operate as intended, removing and maintaining a steady water level
controlled by the pump settings (Figure 3H). Note, the increases in the
sump's water levels at times is related to temporary testing of the pump
for adjustments to the pump's settings and cycling. The underdrain
temporary pump was installed in mid -November 2021 with settings
adjusted in early December 2021.
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Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
Perimeter of the Phase 2 Expansion:
• Monitoring locations CLF21-11, CLF21-12, and CLF21-13 are located east
and south of Cell 5. The water levels trends for CLF21-11 and CLF21-12
are becoming more stable (Figures 3C and 3D) as a result of the Cell 5
underdrain completion. The underdrain is maintaining groundwater
levels in the vicinity of Cell 5 following an initial decrease due to
dewatering during underdrain construction and dewatering operation.
The water level trend for CLF21-13 reasonably closely matches model
predictions (Figure 3D). CLF21-13 was damaged in October 2021, and
abandoned and replaced with CLF21-13R in November 2021 (Figures 3D).
The decreasing water level trends are primarily due to the localized effect
of the underdrain.
Monitoring locations CLF21-14 and CLF21-15 are located west of Cell 6
(Figure 1). Water levels in the two shallow piezometers are decreasing at a
linear rate (Figure 3E). CLF21-14 is located near the ash basin finger where
CCR excavation is occurring, and water levels are decreasing lower than
model predicted elevations. CLF21-15 is upgradient of CLF21-14; the
water level continues to decrease and is approaching model predicted
elevations. Decreasing water level trends are due to excavation of CCR
and dewatering for construction of ILF Phase 2, Cell 6 and the ILF Future
Phase 3.
Downgradient of the Phase 2 Expansion (Future Phases area):
February 2022
Monitoring location MW-7 (OB-3) is located downgradient of the ILF
Phase 2 expansion (Figure 1). Shallow water levels at MW-7 (OB-3) are
decreasing at a linear rate (Figure 3B). The water level trend reasonably
closely matches model predictions. Decreasing water level trends are due
to excavation of CCR and dewatering for construction of the Future
Phases.
Monitoring locations CLF-301 and CLF-302 are located within the Future
Phase 3 expansion, while CLF-303 and CLF-304 are located downgradient
of the Future Phase 3 expansion (Figure 1). Due to excavation activities,
CLF-302 was abandoned in December 2021. Shallow water levels are
decreasing at each monitoring location (Figure 3I and 3J). For CLF-301,
water levels continue to steadily decrease and the trend reasonably closely
matches model predictions. Prior to abandonment, water levels at CLF-
302 continued to decrease at a relatively fast rate and decreased below
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Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
model predicted elevations around late October 2021. For CLF-303 and
CLF-304, water levels continue to steadily decrease and remain lower than
the model predicted elevations. Decreasing water level trends for each
piezometer are due to excavation of CCR and dewatering for construction
of the Future Phases.
• Monitoring locations CLF-401, CLF-402, CLF-403 and CLF-404 are located
within the Future Phase 4 expansion (Figure 1). Due to excavation
activities, CLF-403 and CLF-404 were abandoned in December 2021.
Shallow water levels are decreasing at each monitoring location
(Figure 3K and 3L). For CLF-401 and CLF-402, water levels continue to
steadily decrease and remain lower than the model predicted elevations.
Prior to abandonment, water levels at CLF-403 and CLF-404 also
continued to steadily decrease and remained lower than the model
predicted elevations. Decreasing water level trends for each piezometer
are due to excavation of CCR and dewatering for construction of the
Future Phases.
2.2.2 Dewatering and Underdrain Pump Performance
Two excavation and construction dewatering pumps are installed within or
downgradient of ILF Phase 2, Cell 6, and the ILF Future Phases (Figure 1). The
excavation and construction dewatering pump previously installed in ILF Phase
2, Cell 5 has been replaced with a temporary underdrain pump (the permanent
dual pumps for the underdrain remain on backorder). The Cell 5 dewatering and
underdrain pumping flow rate records are merged since pumping has been
continuous and from the general same location (underdrain sump).
The pumps remove groundwater and, for Cell 6 and the Future Phases areas,
precipitation runoff. The Cell 5 underdrain pump does not receive precipitation
runoff; the underdrain is now enclosed, with completion of the Cell's subgrade
and ongoing installation of compacted soil liner. The pump in Cell 5 is intended
to maintain groundwater levels and the pump in Cell 6 is intended to remove
groundwater seepage flow. Alternatively, the Future Phases pump is intended to
remove water from the active excavation area for the ILF expansions, and is
periodically lowered with excavation to continue drawing down water levels.
Water removed by each pump is discharged to the lower portion of the ash
basin.
Groundwater modeling was used to predict the flow rates of an operational
Cell 5 underdrain sump and flow rates of the excavation dewatering in the
February 2022
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Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
Future Phases footprint (Cell 6 dewatering was not included in the original
transient model). The predictive model assumes that the Cell 5 underdrain
begins operating January 2022 and that no dewatering was conducted during
installation of the underdrain or prior to completion of the underdrain. This
assumption is a limitation of the model and results in an initial conservative
(high) predicted flow rate from the Cell 5 underdrain, since dewatering did occur
during construction as it was a critical activity for installation of the Cell 5
underdrain. Cell 5 construction dewatering operations seamlessly transitioning
into underdrain operations has resulted in lower initial flow rates than predicted
by the model, and the discrepancy is a result of the difference between the model
assumptions and the actual field activities (Figure 4A).
The predicted start of pumping at the Cell 5 underdrain aligns with actual start
of pumping from the Cell 5 sump and has been adjusted to account for an
accelerated dewatering schedule (Figure 4A). Flow rates downgradient of
excavation and construction activities for Cell 6 continue to be monitored and are
shown in Figure 4B.
Predicted and measured flow rates from the Future Phases excavation
dewatering pump are shown in Figure 4C. No temporal adjustments were made
for flow rate data because the model assumes dewatering is occurring during the
entire predictive model time period, which is consistent with field operations.
The Cell 5 underdrain pump has been operational for 3 months and the pumping
rate appears to be stable at approximately 10 gallons per minute (gpm). The
measured flow rate reasonably matches the predicted steady state flow rate of 18
gpm estimated using the steady state blanket underdrain model presented in
Technical Memorandum: Modeling Support for the ILF Phase 2 Permit to
Construct Modifications (SynTerra, 2021). The Cell 5 dewatering pump removed
water in order to decrease the groundwater levels; the underdrain pump is
intended to maintain the groundwater level and is expected to slowly decrease
over time. The Cell 6 dewatering pump remains stable. The Future Phases
dewatering pump is increasing as the model predicted.
ILF Cell 5, Cell 6, and Future Phases available pumping data, including the
calculated monthly total volume pumped and monthly average flow rate, per
location, is included in Appendix C Excel spreadsheets. Combined pumping
operations for Cell 5, Cell 6, and the Future Phases area have removed
approximately 7.5 million gallons of water during the reporting period, resulting
February 2022
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Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
in approximately 6 million gallons more than were removed in Q3 2021. Note,
pump flow data from Q3 2021 only includes 17 days of flow rate monitoring
compared to 92 days of flow rate monitoring during Q4 2021. Since initiating
flow rate monitoring of dewatering and underdrain pumping operations (mid -
September 2021 through December 2021), a total of approximately 8.5 million
gallons of water have been removed from the ILF Phase 2 and Future Phases
area.
For each pump, the average flow rates for the reporting period and each month
are listed below.
• The Cell 5 underdrain pump had an average flow rate of 9.7 gpm overall
during the reporting period, and monthly average flow rates of:
o 9.3 gpm during October 2021,
o 10.3 gpm during November 2021,
o 9.7 gpm during December 2021.
• The Cell 6 Pump had an average flow rate of 4.8 gpm overall during the
reporting period, and monthly average flow rates of:
o 4.8 gpm during October 2021,
o 5.4 gpm during November 2021,
o 4.2 gpm during December 2021.
• The Future Phases Pump had an average flow rate of 43.5 gpm overall
during the reporting period, and monthly average flow rates of:
o 42.0 gpm during October 2021,
o 45.1 gpm during November 2021,
o 43.3 gpm during December 2021.
February 2022
Page 2-8
Project: 00.0083.46.05

Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
3.0 QUARTERLY WATER -LEVEL REDUCTION ACTIVITIES
Efforts made during the reporting period by Duke Energy to safely expedite the
reduction of groundwater levels within the ILF Phase 2 expansion and the Future
Phases include:
Cell 5
• Blanket underdrain construction was completed on October 22, 2021.
• Continued underdrain operations, with an average flow rate of approximately
9.7 gpm.
• Installation of transducer in the underdrain sump to closely monitor water levels
and underdrain operations.
• Continued landfill construction, with completion of the subgrade and ongoing
installation of the compacted soil liner.
• Five piezometers (CLF21-16, CLF21-17, CLF21-18, CLF21-19, and CLF21-20) were
abandoned for continued construction of the landfill.
Cell 6
Complete excavation of CCR from the ash basin finger within Cell 6 and a small
portion of the finger downgradient of Cell 6, and submittal of clean closure
confirmatory sampling [visual and polarized light microscopy] results to DWM.
• Continued landfill construction, with installation of the subgrade (including
backfilling in the ash basin finger within Cell 6) and construction of the southern
embankment.
• Dewatering downgradient of Cell 6 is being maintained, with an average flow
rate of approximately 4.8 gpm.
Future Phases
• Continued excavation of CCR. Approximately one -fifth of CCR material to be
excavated, has been removed from this area.
• Excavation dewatering of existing excavation rim ditches is being maintained,
with an average flow rate of approximately 43.5 gpm.
• Four piezometers (CLF21-13, CLF-302, CLF-403, and CLF-404) were abandoned
due to excavation progress in the ash basin that overlaps with the Future Phases
footprint.
February 2022 Page 3-1
Project: 00.0083.46.05

Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
• Piezometer CLF21-13 and the associated transducer were damaged by
excavation equipment; the piezometer and transducer were replaced with
CLF21-13R.
February 2022
Page 3-2
Project: 00.0083.46.05

Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
4.0 REFERENCES
SynTerra (2021). Technical Memorandum: Modeling Support for the ILF Phase 2 Permit to
Construct Modification Marshall Steam Station. October 5, 2021.
February 2022
Page 4-1
Project: 00.0083.46.05

Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
FIGURES
L7
synTerra
Science & Engineering Consultants

872 ^ry - '• - - 880
°' �U aao °,. � . ,r •�'T' ago ro '� �' • � i sos � � `Po
1 1 asa ILF-2S/D - __ �� sa9 • _■ /R,. .
7F
�°o I .8�7 i • f 904- -896
--� - ��-JA/F/.J~ ♦ yjj ■ .���_
y � r{� fj{i ram` • J -� � -- d 1. �� ,~ _ f 1r1: i j a°o 1
COD
ash fir._` I p -28 ry f i7_r ! �� ♦ .. -
"- �, E
� 864 �i - � � ♦ ` • • 5
// � � , �. Ie `♦ ♦ , oar �i% � � �� r � � '
aaa CIL 21-10 os ass
� a928�
��yl ! 1 J z _ I�� 977 ♦� �$ 'r J ��Y 1/ l 92
O
r A
CLF21-18 ~� �� J MW-4 ♦ 47 ;
_
1 .-� • ! MW-4D s I
CLF21-16�
CLF21-20 asa
CLF-UD IJJ[j 4 LEGEND
\.`• I s 9 `, _ CLF21-15 1} [17 l // LONG-TERM PIEZOMETERAND/OR
11 'I i, f `' GROUNDWATER MONITORING WELL
CLF21-12
�.�.-.. .
CLF21-17 'e TEMPORARY PIEZOMETER
+- j CLF21-13
_ • r- g56 •856 � � ''. i � DEWATERING OR UNDERDRAIN PUMP
• CLF21-13R a a { .s CLF21-14 ` 1 `—��
� � ABANDONED PIEZOMETER
{�D♦ ! ` • l ��� / • • %' s 'aza ASH BASIN WASTE BOUNDARY
.' • : 1 , r
GEOGRAPHIC LIMITATION
r ! o-^ LANDFILL COMPLIANCE BOUNDARY
mb
a4s `1 CLF-401 1, } CELL PUMPSTRUCTURAL FILL BOUNDARY
LANDFILL BOUNDARY
LEACHATE BASIN
DUKE ENERGY CAROLINAS PROPERTY LINE
{
TOPOGRAPHIC CONTOUR (8' INTERVAL)
824
ati ,r OB-3 (MW-7) 31111 STREAM (MCKIM & CREED)
WETLAND (MCKIM &CREED)
NOTES:
G' 1. THE CLF-UD LOCATION WAS FORMERLY KNOWN AS CELL 5 PUMP.
2. ALL BOUNDARIES ARE APPROXIMATE.
-�F-404
CLF-303 \� • • • 3. THE STREAMS AND WETLANDS JURISDICTIONAL DETERMINATION WAS APPROVED
• a ��, 0 BY THE US ARMY CORPS OF ENGINEERS ON OCTOBER 25, 2017 (SAW-2015-01412).
WETLANDS AND STREAMS BOUNDARIES WERE OBTAINED FROM AMEC FOSTER
_ %r�� • WHEELER ENVIRONMENTAL AND INFRASTRUCTURE, INC. NATURAL RESOURCES
TECHNICAL REPORT (NRTR) DATED JUNE 2015.
4. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
. l FUTURE a
a° 5. THE TOPOGRAPHY IS SHOWN FOR REFERENCE PURPOSES ONLY AND SHOULD
PUMP PHASES 5. �'��
NOT BE USED FOR DESIGN OR ENGINEERING PURPOSES. TOPOGRAPHY IS
OBTAINED FROM CATAWBA COUNTY GIS WEBISTEAT
https://www.catawbacountyne.gov/online-services/datasets/.
6. MAXAR SATELLITE IMAGERY OBTAINED FROM ESRI ONLINE, COLLECTED AUGUST
24, 2021.
CLF-304 6 7. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM FIPS 3200 (NAD83).
IIII �'' rr 'I•~f--�� _- .�' ' GRAPHIC SCALE
. • _ DUKE 200 0 200 400 FIGURE 1
ENERGY. NFEET) MONITORING LOCATION MAP
r"
,ram""-'✓`� t CAROLINAS
GROUNDWATER CONDITIONS QUARTERLY REPORT
J 'v DRAWN BY: W. PRAYER DATE: 01/20/2022
7 .,.Z •i�- 1..�^J/��, %, i aZ4 , •S REVISED BY. C.WYATT DATE:01/27/2022 OCTOBER 2021 THROUGH DECEMBER 2021
CHECKED BY: D. AVARD DATE: 01/27/2022
VIP APPROVED BY: T.COLTON DATE:01/27/2022 MARSHALL STEAM STATION
r� PROJECT MANAGER: T. COLTON
/,! '` : synTerrd TERRELL, NORTH CAROLINA
{ '" a,a www.synterracorp.com

SEE FIGURE 2b FOR DETAILED WATER LEVEL BG-1 S
CONTOURS AND ADDITIONAL WATER LEVEL 807.35
MEASUREMENTS TAKEN IN THE AREA OF FOCUS
z
GWA-8S
ILF-2S
s/ 841.09 sod 824.32
V o ' 8f
u,
f
_ GWA-4S
MW-4 y + I
849.57 832.03
soo o/ U j GWA-5S
g30 BP, BELOW 806.88 �.
5 CLF-UD I//. ..
s �.,`_./ BG2s� LEGEND
♦ 811.25
.� y 808.63 Tez
815' � /�-�.- .
GWA-14S a , II'' �sg MW-ss WELL ID
CLF-301 I 2p\ Yy� 765.8o WATER LEVEL (NAVD 88, FEET)
872.09 ° CLF-401 • 815.86 / »a
+ o GWA-3S a3 S MW-3 ti GWA-6S
h a I h e2 814.25 ` 804.83 808.53
anti � MONITORING WELL
az� CLF-402 813.01' �'' C PIEZOMETER
PVSF-3S ) CLF-403 80982 ,AL-3S ^� � BACKGROUND MONITORING WELL
810.25 (OB 3) 808.95 ABANDONED MONITORING WELL
m o s CLF-302 CLF-303 817.
DEWATERING OR UNDERDRAIN PUMP
� 31 ) �
MW-13S Nx-
w CLF-404 .O 41 1 O INFERRED WATER LEVEL CONTOUR (5' INTERVAL)
PVSF-2S 809,58._ /� s� �/, �• GROUNDWATER FLOW DIRECTION
91, PI AL-2S �� ASH BASIN WASTE BOUNDARY
a° FUTURE PHASES 802.92
` PUMP" CCR-16S GWA-7S �'/ GEOGRAPHIC LIMITATION
8 ` ` AB-13SBP, BELOW 795.62797.38 ', LANDFILL COMPLIANCE BOUNDARY
_�s , � ti ;� '1
799.13 STRUCTURAL FILL BOUNDARY
CLF-304 MW-2790,__., CCR-15S , Jl� LANDFILL BOUNDARY
AB-14S BP, BELOW 783.25 J .
797.85 785.38 MW-14S ! -' LANDFILL CELL 5 AND 6 BOUNDARY
�t 0 811.08 ® CCR-15D BP, BELOW 761.36
AB-12SL AB-10SL �$� f -LEACHATE BASIN
GWA-13S ,.PVSF-4S A ` AB-14DU ® No Access 783.42 787.25 .' Q!!N1 GWA-10S DUKE ENERGY CAROLINAS PROPERTY LINE
868.84 849.30 812.02 L J
`�
AB-12S AB-10S 755.62 TOPOGRAPHIC CONTOUR (8' INTERVAL)
No Access 1784.95
N ° l AL-1S STREAM (MCKIM & CREED)
FPo-••� ` `. AB 7S .. AB-9S DRY, BELOW GWA-15S s� ( )
8ga AB-8S 768.43 ® WETLAND MCKIM & CREED
i f �� j 820.41 ❑ (% ❑ / 751.77
PVSF-1S � 789.08 �, 783.23 � NOTES:
Pa 832.71 AB-7DU AB 8DU ' j�jV�/_1 GWA-11 S 1. WATER LEVELS WERE COLLECTED ON NOVEMBER 15, 2021. CLF-UD
} (UNDERDRAIN SUMP) WATER LEVEL WAS COLLECTED ON NOVEMBER 18, 2021.
820.98 BP, BELOW 754.79
789.34 : / BP, BELOW
744.102.' - DEWATERING OR UNDERDRAIN PUMP ELEVATION. WATER LEVEL CONTROL
g t �> ��� POINT.
-, GWA-12S I MAB 6S ! i
MW 6S W-11 S'' � � �ti N 6 3 "-FUTURE PHASES PUMP LOCATION IS FOR REFERENCE ONLY. NOT WATER
871.16 843.23 825.43 ' ` m AB S ELOW 762.58 eoo "" DRY, BLEVEL CONTROL POINT.
786.29 1 y CCR + - 4. WATER LEVEL CONTOURS WERE DERIVED USING DATA COLLECTED FROM
-9S
761.63 MONITORING WELLS AT THE SITE ON NOVEMBER 15, 2021. ADDITIONAL
I 4 mtia PIEZOMETERS WERE USED TO INTERPRET CONTOURS IN THEAREAOF FOCUS,
WHICH ARE SHOWN IN FIGURE 2b.
AB
830.25 A 0 S ��h 1 5. W.E. - WATER ELEVATION (APPROXIMATE)
°� 762.62.88 I_ , f.o
MS-9 `� / r 6. BP -BELOW BLADDER PUMP
h 828.61 `876 AB-4S '9z MW 7S MW-10s / 7. ELEVATIONS ARE REFERENCED TO THE NORTH AMERICAN VERTICAL DATUM OF
786.77 _ F 759.09 755.43 !. i 1988 (NAVD 88).
I• ` 8. THE STREAMS AND WETLANDS JURISDICTIONAL DETERMINATION WAS
' I AB-5S " AB-4SL� APPROVED BY THE US ARMY CORPS OF ENGINEERS ON OCTOBER 25, 2017 (SAW-
MS-10 AB-3Sa MW-8s +/ 2015-01412). WETLANDS AND STREAMS BOUNDARIES WERE OBTAINED FROM AMEC
93.9
832.34 y �Y. 75 785.89 '' DRY BEL W 7 1 e 757.02 + FOSTER WHEELER ENVIRONMENTALAND INFRASTRUCTURE, INC. NATURAL
{{{( h O 85 9 AB-2S / 1 RESOURCES TECHNICAL REPORT (NRTR) DATED JUNE 2015.
MS-15 o A 94.35 F 759.81 MN-9S ♦ �+ i( '� -` 9. THE TOPOGRAPHY IS SHOWN FOR REFERENCE PURPOSES ONLY AND SHOULD
'y } 758.78 + 1.�` tJ, NOT BE USED FOR DESIGN OR ENGINEERING PURPOSES. TOPOGRAPHY IS
MS-11 820.92 ,fl CP-1 s V OBTAINED FROM CATAWBA COUNTY GIS WEBISTEAT
CCR-2S htt s://www.catawbacount nc. ov/online-servicestdatasets/.
BP, BELOW I <; �e P Y 9
aqa j 824.67 ...��� 783.85 783 47 �10. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
1 759.18
MS-13 �jL 11.ALL BOUNDARIES ARE APPROXIMATE.
o {aI 810.67 �{ MS 14 CCR-1 S
l 808.45 ' r 792.13 O� CCR-4S o 12. MAXAR IMAGERY OBTAINED FROM ESRI ONLINE, COLLECTED AUGUST 24, 2021.
CP-2S GWA-1 S 0 758.64 ^� m + 13. DRANE WING
HASTBEEN SET E SYSTEM FI H 3PROJECTION OF NORTH CAROLINA STATE
j MS-12 GP-2S 794.65 760.12I MEOW dill.
`J 812.04 �` g04.97 GRAPHIC SCALE
CCR-3S DUKE
/ 500 0 500 1,000 FIGURE 2A
� ( /� ('
802.62 am�� ' ` �55
757.13 ENERGY® SITEWIDE WATER LEVEL MAP
w CAROLINAS (IN FEET) UPPER FLOW ZONE (NOVEMBER 2021)
GP-18 GP-3S n°�' or.��. / DRAWN BY: C.WYATT DATE:12/08/2021 GROUNDWATER CONDITIONS QUARTERLY REPORT
800.37 ^ . REVISED BY: R. KIEKHAEFER DATE:01/31/2022
` 803.67 CP-3S CHECKED BY: T.COLTON DATE:01/31/2022 OCTOBER 2021 THROUGH DECEMBER 2021
84g 876 BP BELOW R 83Z , APPROVED BY: T.COLTON DATE:01/31/2022 MARSHALL STEAM STATION
784.81 Q WnTerrd PROJECT MANAGER: T. COLTON TERRELL, NORTH CAROLINA
www.synterracorp.com

ILF-2S
sit 0
�ptiy 841.09
s /
CLF21-10
°°6 • 840.79
/6I ` /
//' /
/
I' GWA-4S / �/ w�
s/ 849.57
CLF21-18
� e
o ap5• /
5
GWA-3S
836.74 °tih
ll�m
837.5
oryw O � e
',928
A
CLF21-11 / 824.49 CLF21-19
825.58 819.73
• o
/ CLF21-16 wo
d , 820.53
/
CLF21-20
CY 820.75
LF-UD �
811.25 " •� �✓
�815•
/ CLF21-17 �� ♦,
CLF21-12 �� C 818.63
819.58 -0 CLF21-14
CLF21-13 S5a�856 818.81
CLF21-13R
818.54 //
CLF-301 824
/ CLF-401 ` 815.86
/ N 814.25 �a �� 1
' � CELL 6 PUMF
813.01*
1
/ CLF-402 `O
/ CLF-403� `
/ 810.25 4 CLF-302 87,
e/ 810.02 1?6///
0000
• � r
CLF-404
! 1 809.58 , // 00,/
FUTUair RE PHASES
ap0 CLF-304
797.85 \l
CLF-303
799.36
i-'
800
(' DUKE
ENERGY®
CAROLINAS
1417
synTerra
LEGEND
d
MW-65
WELL ID
832.5
�'
765.8o
WATER LEVEL (NAVD 88, FEET)
MW-4
MONITORING WELL
832.03 g30
C PIEZOMETER
% a
lie BACKGROUND MONITORING WELL
e ABANDONED MONITORING WELL
-.�. 82�7.5
(
C ABANDONED PIEZOMETER
e DEWATERING OR UNDERDRAIN PUMP
ar
KW-7 (OB
M
817.31
INFERRED WATER LEVEL CONTOUR (2.5' INTERVAL)
1-15 GROUNDWATER FLOW DIRECTION
3 ASH BASIN WASTE BOUNDARY
GEOGRAPHIC LIMITATION
BZzs\\ LANDFILL COMPLIANCE BOUNDARY
STRUCTURAL FILL BOUNDARY
LANDFILL BOUNDARY
\ ' ' • - - LANDFILL CELL 5 AND 6 BOUNDARY
C r LEACHATE BASIN
DUKE ENERGY CAROLINAS PROPERTY LINE
r/ TOPOGRAPHIC CONTOUR (8' INTERVAL)
> STREAM (MCKIM & CREED)
WETLAND (MCKIM & CREED)
-3) Oc NOTES:
1. WATER LEVELS WERE COLLECTED ON NOVEMBER 15, 2021. CLF-UD
(UNDERDRAIN SUMP) WATER LEVEL WAS COLLECTED ON NOVEMBER 18, 2021.
2. * - DEWATERING PUMP ELEVATION. WATER LEVEL CONTROL POINT.
3. ** - FUTURE PHASES PUMP LOCATION IS FOR REFERENCE ONLY. NOTA WATER
LEVEL CONTROL POINT.
• • 4. ELEVATIONS ARE REFERENCED TO THE NORTH AMERICAN VERTICAL DATUM
(PHASE 11) 1 o OF 1988 (NAVD 88).
PERMIT • 1804pa
0 5. THE STREAMS AND WETLANDS JURISDICTIONAL DETERMINATION WAS
\ g2 r APPROVED BY THE US ARMY CORPS OF ENGINEERS ON OCTOBER 25, 2017 (SAW
-
2015-01412). WETLANDS AND STREAMS BOUNDARIES WERE OBTAINED FROM
AMEC FOSTER WHEELER ENVIRONMENTAL AND INFRASTRUCTURE, INC.
NATURAL RESOURCES TECHNICAL REPORT (NRTR) DATED JUNE 2015.
s�
6. THE TOPOGRAPHY IS SHOWN FOR REFERENCE PURPOSES ONLY AND SHOULD
NOT BE USED FOR DESIGN OR ENGINEERING PURPOSES. TOPOGRAPHY IS
OBTAINED FROM CATAWBA COUNTY GIS WEBISTEAT
https://www.catawbacountync.gov/online-services/datasets/.
7. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
w 8. ALL BOUNDARIES ARE APPROXIMATE.
000 ed w 9. MAXAR IMAGERY OBTAINED FROM ESRI ONLINE, COLLECTED AUGUST 24, 2021.
10. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE
PLANE COORDINATE SYSTEM FIPS 3200 NAD83 .
GRAPHIC SCALE
200 G00 400 FIGURE 2B
AREA OF FOCUS WATER LEVEL MAP
(IN FEET) UPPER FLOW ZONE (NOVEMBER 2021)
DRAWN BY: C. WYATT DATE: 12/08/2021 GROUNDWATER CONDITIONS QUARTERLY REPORT
REVISED BY: R. KIEKHAEFER DATE: 01/31/2022
CHECKED BY: T. COLTON DATE: 01/31/2022 OCTOBER 2021 THROUGH DECEMBER 2021
APPROVED BY: T. COLTON DATE:01/31/2022 MARSHALL STEAM STATION
PROJECT MANAGER: T. COLTON TERRELL, NORTH CAROLINA
www.synterracorp.com

GWA-04S/ D
ILF-02S/D
00
00
Z
4j
LL
C
>
W
>
0)
J
L
0)
M
00
00
C
Q
Z
4j
LL
C
O
I
M
07
W
07
>
07
J
L
M
►-
853
852
851
�3.7i=
849
848
847
M
3
2
M
C
.M
OC
1
0
7/ 16/2021 8/ 15/2021 9/ 14/2021 10/ 14/2021 11 / 13/2021 12/ 13/2021
Date
GWA-04S - Total water level change from transducer installation on 07/30/2021 to 01/01/2022 is -1.8 feet.
GWA-04D - Total water level change from transducer installation on 07/30/2021 to 01/01/2022 is -2.2 feet.
GWA-04S/D
855
850
845
E:iLil
835
O
r
4
3
1
0
6/ 1 /2021 12/ 1 /2021 6/ 1 /2022 12/ 1 /2022
Date
0-1
00
00
Z
a.+
LL
C
1Z
M
>
W
Z
>
G7
J
L
07
M
846 -
845 -
844
4
3
C
2 `"o
C
.M
OC
1
0
7/ 16/2021 8/ 15/2021 9/ 14/2021 10/ 14/2021 11 / 13/2021 12/ 13/2021
Date
ILF-02S - Total water level change from transducer installation on 07/30/2021 to 01/01/2022 is -0.3 feet.
ILF-02D - Total water level change from transducer installation on 07/30/2021 to 01/01/2022 is +0.5 feet.
ILF-02S/D
E:LK3
842
841
840
,1%
850
00
00
C
Q
845
Z
++
LL
840
O
I
M
07
835
W
07
>
07
J 830
L
3
825
O
6/ 1 /2021
4
3
1
0
12/ 1 /2021 6/ 1 /2022 12/ 1 /2022
Date
LEGEND Notes:
DUKE
DRAWN BY: D.AVARD DATE:07/21/2021
FIGURE 3A
Cell 5 construction start (05/31/2021) NAVD 88 — North American
� ENERGY
REVISED BY: D.AVARD DATE:01/24/2022
HYDROGRAPHS —INDUSTRIAL LANDFILL NO 1.
Future Phases 3 through 5 CCR excavation start 06/18/2021
g ( ) Vertical Datum 1988
CAROLINAS
CHECKED BY: T.COLTON DATE:01/24/2022
(1812-INDUS) PHASE 2 EXPANSION
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft - Feet
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021)
in -inches
APPROVED BY: T. COLTON DATE: 01/24/2022
OCTOBER 2021 THROUGH DECEMBER 2021
Shallow Groundwater Flow Zone Transducer Data
( )
Deep Groundwater Flow Zone (Transducer Data) � Manual Water Level Measurement
5�/C1T�'a
PROJECT MANAGER: T. COLTON
MARSHALL STEAM STATION
— — - Transient Groundwater Model Water Level Predicted Trend Daily Total Rainfall (inches)
TERRELL, NORTH CAROLINA
www.synterracorp.com

MW-04/D
MW-07 (OB-3)
4
0-% 834
4
0.1% 820
000
000
0
0
G
G
833
Q
819
Q
Z
3
Z
3
4j
LL
832
4+
818
%�0
0
0
=
=
2
M
817
2
831
O
>
—
>
0)
y
W
C
830
>
816
J
1
J
1
L
829
L
07
815
M
0
0
828
814
7/ 18/2021 8/ 17/2021 9/ 16/2021 10/ 16/2021 11 / 15/2021 12/ 15/2021
7/ 18/2021 8/ 17/2021
9/ 16/2021 10/ 16/2021 11 / 15/2021 12/ 15/2021
Date
Date
MW-04 - Total water level change from transducer installation on 07/30/2021 to 01/01/2022
is -1.9
feet.
MW-07 (013-3) - Total water level change from transducer installation on 07/30/2021 to 01/01/2022
is -1.1 feet.
MW-04D - Total water level change from transducer installation on 07/30/2021 to 01/01/2022 is -1.7 feet.
MW-04/D
MW-07 (OB-3)
4
825
4
840
00
00
00
00
Q
835
Q
820
Z
3
Z
3
8
-----------
�
go
,.
G
830
—
O
C
O
815
C
R
2
7-0
M
2
_
_
W825
—
C
810
C
IL
07
�
07
OC
L
820
i
805
R
�
0
800
0
815
6/1/2021 12/ 1 /2021
6/ 1 /2022 12/ 1 /2022
6/1/2021
12/ 1 /2021 6/ 1 /2022 12/ 1 /2022
Date
Date
LEGEND
Notes:
DUKE
DRAWN BY: D.AVARD
DATE:07/21/2021
FIGURE 3B
Cell 5 construction start (05/31/2021)
NAVD 88 — North American
� ENERGY
REVISED BY: D.AVARD
DATE:01/24/2022
HYDROGRAPHS —INDUSTRIAL LANDFILL NO 1.
h 5 CCR excavation start 06/18/2021
Future Phases 3 through ( )
Vertical Datum 1988
CAROLINAS
(1812-INDUS) PHASE 2 EXPANSION
Cell 5 Blanket Underdrain construction start (9/20/2021)
Ft - Feet
CHECKED BY: T.COLTON
DATE:01/24/2022
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021)
in
APPROVED BY: T. COLTON
DATE: 01/24/2022
Shallow Groundwater Flow Zone ( Transducer Data)
-inches
OCTOBER 2021 THROUGH DECEMBER 2021
Bedrock Groundwater Flow Zone (Transducer Data) �
Manual Water Level Measurement
S)/r1T�'a
PROJECT MANAGER: T. COLTON
MARSHALL STEAM STATION
— — - Transient Groundwater Model Water Level Predicted Trend
Daily Total Rainfall (inches)
TERRELL, NORTH CAROLINA
www.,ynterracorp.com

CLF21-10
CLF21-11
4
4
843
�
0 830
00
00
C
G
842
Q
829
♦`'
Q
Z
3
Z
3
}7
LL
4+
LL
%-0
828
841
G
=
O
M
2
—
M
>
827
2 —
840
>
Q)
M
0)
M
W
=
W
=
839
;
826
07
838
Q)
825
—
M
M
0
ILI0
837
824
8/8/2021 9/7/2021 10/7/2021 11
/6/2021 12/6/2021
8/8/2021 9/7/2021
10/7/2021 11 /6/2021 12/6/2021
Date
Date
CLF21-10 - Total water level change from transducer installation on 08/10/2021 to 01/01/2022
is -0.3 feet.
CLF21-11 - Total water level change from transducer installation on 08/09/2021 to 01/01/2022
is -3.6 feet.
CLF21-10
CLF21-11
4
,�%
840
4
,�% 850
00
00
00
00
Q
845
Q
835
Z
3
Z
3
4
4j
o 0 0
0•
o o
C
840
C
830
0
0
Op
._
M
2
O
-
2
—
M
O
835
C
825
C
IL
IL
@
07
OC
L
830
i
820
M
M
0
815
0
825
6/ 1 /2021 12/ 1 /2021
6/ 1 /2022 12/ 1 /2022
6/ 1
/2021
12/ 1 /2021
6/ 1 /2022 12/ 1 /2022
Date
Date
LEGEND
Notes:
DUKE
DRAWN BY: D.AVARD
DATE:07/21/2021
FIGURE 3C
Cell 5 construction start (05/31/2021)
NAVD 88 - North American
� ENERGY
REVISED BY: D.AVARD
DATE:01/24/2022
HYDROGRAPHS -INDUSTRIAL LANDFILL NO 1.
Future phases 3 through 5 CCR excavation start 06/18/2021
p g ( )
Vertical Datum 1988
CAROLINAS
(1812-INDUS) PHASE 2 EXPANSION
Cell 5 Blanket Underdrain construction start (9/20/2021)
Ft -Feet
CHECKED BY: T. COLTON
DATE:01/24/2022
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021)
In - Inches
APPROVED BY: T.COLTON
DATE:01/24/2022
Shallow Groundwater Flow Zone (Transducer Data)
OCTOBER 2021 THROUGH DECEMBER 2021
- -
- Transient Groundwater Model water level predicted trend
Manual Water Level Measurement
S)/r1Ta
PROJECT MANAGER:T.COLTON
MARSHALL STEAM STATION
Daily Total Rainfall (inches)
www.synterracorp.com
TERRELL, NORTH CAROLINA

CLF21-12
CLF21-13/R
4
4
824
�
0 822
00
00
CLF21-13 was abandoned and
p
p
replaced on November 4, 2021.
823
♦
Q
821
Q
Z
3
Z
3
LL
♦
`' �•j• .., *��
822
.LLi
820
C
�.
C
♦
071
O
=
O
♦
C
M
821
2
M
819
♦
2
Q)
M
Q)
M
W
=
W
=
75
820
M
818
—
—
♦
;
J
♦
♦
1
D
1
L
G7
819
L
Q)
817
—
M
M
LL818
0
0
816
8/8/2021 9/7/2021 10/7/2021 11
/6/2021 12/6/2021
8/8/2021 9/7/2021
10/7/2021 11 /6/2021 12/6/2021
Date
Date
CLF21-13R - Total water level change from transducer installation on 11/08/2021 to 01/01/2022
is -0.4 feet.
CLF21-12 - Total water level change from transducer installation on 08/09/2021 to 01/01/2022
is -3.2 feet.
CLF21-13 - Total water level change from transducer installation on 08/09/2021 to 10/01/2021
is -0.2 feet.
CLF21-12
CLF21-13/R
4
,�%
830
4
,�% 830
00
00
00
00
Q
825
—
Q
825
Z
3
Z
3
o0
�
LL
G
820
—
p .
O O `
CO
820
0'
��•
O O
C
p�
a:+
\
2
ri
2
M
\
\
\
—
M
M
>
—_
M
W815
�C
C
W
815
C
@
\
\
�
G7
M
OC
L
810
i
810
M
M
0
805
0
805
6/1/2021 12/ 1 /2021
6/ 1 /2022 12/ 1 /2022
6/1/2021
12/ 1 /2021 6/ 1 /2022 12/ 1 /2022
Date
Date
LEGEND
Notes:
DUKE
DRAWN BY: D.AVARD
DATE:07/21/2021
FIGURE 3D
Cell 5 construction start (05/31/2021)
NAVD 88 — North American
� ENERGY
REVISED BY: D.AVARD
DATE:01/24/2022
HYDROGRAPHS -INDUSTRIAL LANDFILL NO 1.
Future phases 3 through 5 CCR excavation start 06/18/2021
p g ( )
Vertical Datum 1988
CAROLINAS
(1812-INDUS) PHASE 2 EXPANSION
Cell 5 Blanket Underdrain construction start (9/20/2021)
Ft -Feet
CHECKED BY: T. COLTON
DATE:01/24/2022
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021)
In - Inches
APPROVED BY: T.COLTON
DATE:01/24/2022
Shallow Groundwater Flow Zone (Transducer Data)
OCTOBER 2021 THROUGH DECEMBER 2021
- -
- Transient Groundwater Model water level predicted trend
Manual Water Level Measurement
S)/r1Ta
PROJECT MANAGER:T.COLTON
MARSHALL STEAM STATION
Daily Total Rainfall (inches)
www.synterracorp.com
TERRELL, NORTH CAROLINA

00
00
G
Q
Z
4j
LL
C
O
>
_O
W
>
0)
J
L
0)
M
0-1
00
00
G
Q
Z
4;
LL
I
M
G7
W
07
>
07
J
L
�1
M
►-
CLF21-14
823
822
821
820
819
818
817
4
3
C
2 `0
M
C
.M
OC
1
0
8/8/2021 9/7/2021 10/7/2021 11 /6/2021 12/6/2021
Date
CLF21-14 - Total water level change from transducer installation on 08/10/2021 to 01/01/2022 is -3.9 feet.
CLF21-14
830 4
825-
820 -
815 -
810
805
6/1/2021
12/ 1 /2021 6/ 1 /2022
Date
3
1
0
12/1 /2022
0-1
00
00
G
Q
Z
++
LL
C
O
I
M
07
W
07
07
J
L
07
M
00
00
C
Q
Z
++
LL
C
O
I
M
07
W
07
>
07
J
L
�i
i
CLF21-15
827
826
825
824
823
822
821
4
3
C
2 `-o
M
C
.M
OC
1
0
8/8/2021 9/7/2021 10/7/2021 11 /6/2021 12/6/2021
Date
CLF21-15 - Total water level change from transducer installation on 08/13/2021 to 01/01/2022 is -2.8 feet.
CLF21-15
835 4
825
820
815
810 1 9 '
6/1/2021
12/ 1 /2021 6/ 1 /2022
Date
3
1
T 0
12/ 1 /2022
LEGEND Notes:
DUKE
DRAWN BY: D.AVARD DATE:07/21/2021
FIGURE 3E
Cell 5 construction start (05/31/2021) NAVD 88 — North American
� ENERGY
REVISED BY: D.AVARD DATE:01/24/2022
HYDROGRAPHS —INDUSTRIAL LANDFILL NO 1.
Future phases 3 through 5 CCR excavation start 06/18/2021
p g ( ) Vertical Datum 1988
CAROLINAS
CHECKED BY: T. COLTON DATE:01/24/2022
(1812-INDUS) PHASE 2 EXPANSION
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft - Feet
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) in - Inches
APPROVED BY: T.COLTON DATE:01/24/2022
OCTOBER 2021 THROUGH DECEMBER 2021
Shallow Groundwater Flow Zone (Transducer Data)
— — - Transient Groundwater Model water level predicted trend Manual Water Level Measurement
1167
SITa
PROJECT MANAGER: T. COLTON
MARSHALL STEAM STATION
Daily Total Rainfall (inches)
www.synterracorp.com
TERRELL, NORTH CAROLINA

01.
00
00
G
i
Q
Z
4j
LL
C
O
>
_O
W
O
>
0)
J
L
0)
M
O-.
00
00
C
Z
4j
LL
C
O
I
M
>
07
W
07
>
07
J
L
M
►-
825
824
823
822
821
820
819
CLF21-16
4
3
C
2
M
C
.M
OC
1
0
8/8/2021 9/7/2021 10/7/2021 11 /6/2021 12/6/2021
Date
CLF21-16 - Total water level change from transducer installation on 08/09/2021 to 10/08/2021 is -1.6 feet.
CLF21-16
830
820
815
810
805
4
3
1
0
6/1/2021 12/ 1 /2021 6/ 1 /2022 12/ 1 /2022
Date
0..
00
00
G
Q
Z
++
LL
C
O
1Z
M
07
W
07
07
J
L
07
M
0-.
00
00
C
Z
4j
LL
C
O
I
M
07
W
07
>
07
J
L
�i
CLF21-17
822
821
820
819
818
817
816
4
3
C
2 `-o
M
C
.M
OC
1
0
8/8/2021 9/7/2021 10/7/2021 11 /6/2021 12/6/2021
Date
CLF21-17 - Total water level change from transducer installation on 09/01/2021 to 12/06/2021 is -1.7 feet.
CLF21-17
825 4
1*zi=
815 -
810 -
805 -
CLF21-17 was abandoned between
December 6-7, 2021.
O
800
6/1/2021
12/ 1 /2021 6/ 1 /2022
Date
3
1
0
12/ 1 /2022
LEGEND Notes:
DUKE
DRAWN BY: D.AVARD DATE:07/21/2021
FIGURE 3F
Cell 5 construction start (05/31/2021) NAVD 88 — North American
� ENERGY
REVISED BY: D.AVARD DATE:01/24/2022
HYDROGRAPHS —INDUSTRIAL LANDFILL NO 1.
Future phases 3 through 5 CCR excavation start 06/18/2021
p g ( ) Vertical Datum 1988
CAROLINAS
CHECKED BY: T. COLTON DATE:01/24/2022
(1812-INDUS) PHASE 2 EXPANSION
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft - Feet
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) in - Inches
APPROVED BY: T.COLTON DATE:01/24/2022
OCTOBER 2021 THROUGH DECEMBER 2021
Shallow Groundwater Flow Zone (Transducer Data)
— — - Transient Groundwater Model water level predicted trend Manual Water Level Measurement
116'
S)/r1Ta
PROJECT MANAGER:T.COLTON
MARSHALL STEAM STATION
Daily Total Rainfall (inches)
www.synterracorp.com
TERRELL, NORTH CAROLINA

CLF21-18
CLF21-19
4
^ 825
00
4
^ 827
00
00
CLF21-18 was abandoned
00
CLF21-19 was abandoned between
p
between December 6-7, 2021.
p
December 6-7, 2021.
Q 826
Q 824
Z
3
Z
3
4j
LL
4+
LL
..
.0
825
^
823
^
JV
r
O O
O
2
ri
M
O
2
>
—
>
—
O)
ip
07
M
LY 824
=
•f0
W 822
=
y
5
•f0
>
OC
>
OC
J
1
J
1
L 823
i 821
3
822
0
820
0
10/ 1 /2021 10/31 /2021 11 /30/2021 12/30/2021
10/ 1 /2021
10/31 /2021 11 /30/2021 12/30/2021
Date
Date
CLF21-18 - Total water level change from transducer installation on 10/11/2021 to 12/06/2021
is -0.2 feet.
CLF21-19
- Total water level change from transducer installation on 10/11/2021 to 12/06/2021
is -0.06 feet.
CLF21-18
CLF21-19
4
4
830
830
00
00
00
00
p
I
p
Q 825
Q 825
Z
3
Z
3
4
���
4j
LL
LL
..�
= 820
^
..�
C 820
R
2
M
2
—
—
W 815
=
W 815
C
Gl
�
Gl
OC
J
1
J
1
L 810
L 810
0
0
805
805
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022
Date
Date
LEGEND Notes:
DUKE
DRAWN BY: D.AVARD DATE:07/21/2021
FIGURE 3G
Cell 5 construction start (05/31/2021) NAVD 88 - North American
� ENERGY
REVISED BY: D.AVARD DATE:01/24/2022
HYDROGRAPHS -INDUSTRIAL LANDFILL NO 1.
Future phases 3 through 5 CCR excavation start 06/18/2021
p g ( ) Vertical Datum 1988
CAROLINAS
(1812-INDUS) PHASE 2 EXPANSION
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft -Feet
CHECKED BY: T. COLTON DATE:01/24/2022
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) In - Inches
APPROVED BY: T.COLTON DATE:01/24/2022
Shallow Groundwater Flow Zone (Transducer Data)
OCTOBER 2021 THROUGH DECEMBER 2021
- - - Transient Groundwater Model water level predicted trend Manual Water Level Measurement
S)/r1Ta
PROJECT MANAGER: T. COLTON
MARSHALL STEAM STATION
Daily Total Rainfall (inches)
www.synterracorp.com
TERRELL, NORTH CAROLINA

CLF21-20
CLF-UD
00
00
G
Q
Z
4j
LL
C
O
>
_O
W
Q)
>
0)
J
L
M
0-1
00
00
G
Q
Z
4;
LL
C
O
M
G7
W
Gl
G7
J
L
G7
M
823
822
821
I:*011
819
818
CLF21-20 was abandoned
between December 6-7, 2021.
4
3
2 `­0
M
C
.M
1
0
10/ 1 /2021 10/31 /2021 11 /30/2021 12/30/2021
Date
CLF21-20 - Total water level change from transducer installation on 10/11/2021 to 12/06/2021 is -0.4 feet.
CLF21-20
830 4
825 -
:Wi=
815 -
[.3 [IN
805
6/1 /2021
\
\
\
\
\
111 1
Lill,
1.1.1,
12/1 /2021 6/1 /2022
Date
'Cl
C
2 _
M
C
.M
W
1
0
12/1 /2022
00
00
G
Q
Z
++
LL
C
O
1Z
M
G7
W
G7
>
G7
J
L
M
00
00
C
Q
Z
++
LL
C
O
I
M
G7
W
Gl
G7
J
L
G7
816
814
812
808
806
10/20/2021 11 / 19/2021 12/ 19/2021
Date
CLF-UD - Increases in the sump's water levels at times is related to temporary
testing of the pump for optimization of the pump's settings and cycling.
CLF-UD
830
825
820
815
810
805
800
6/1/2021
12/ 1 /2021 6/ 1 /2022
Date
4
3
2 `0
1
0
4
3
1
T 0
12/ 1 /2022
M
C
.M
W
LEGEND Notes:
DUKE
DRAWN BY: D.AVARD DATE:07/21/2021
FIGURE 3H
Cell 5 construction start (05/31/2021) NAVD 88 - North American
� ENERGY
REVISED BY: D.AVARD DATE:01/24/2022
HYDROGRAPHS -INDUSTRIAL LANDFILL NO 1.
Future phases 3 through 5 CCR excavation start 06/18/2021
p g ( ) Vertical Datum 1988
CAROLINAS
CHECKED BY: T. COLTON DATE:01/24/2022
(1812-INDUS) PHASE 2 EXPANSION
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft - Feet
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) in - Inches
APPROVED BY: T.COLTON DATE:01/24/2022
OCTOBER 2021 THROUGH DECEMBER 2021
Shallow Groundwater Flow Zone (Transducer Data)
— — - Transient Groundwater Model water level predicted trend Manual Water Level Measurement
1167
SITa
PROJECT MANAGER: T. COLTON
MARSHALL STEAM STATION
Daily Total Rainfall (inches)
www.synterracorp.com
TERRELL, NORTH CAROLINA

01.
00
00
G
i
Q
Z
4j
LL
C
O
_O
W
O
0)
J
L
0)
M
0-.
00
00
C
Q
Z
4j
LL
C
O
I
M
07
W
07
07
J
L
a.d
M
►-
CLF-301
819
818
817
816
815
814
813
4
3
C
2
M
C
.M
OC
1
0
7/ 15/2021 8/ 14/2021 9/ 13/2021 10/ 13/2021 11 / 12/2021 12/ 12/2021
Date
CLF-301 - Total water level change from transducer installation on 07/27/2021 to 01/01/2022 is -1.4 feet.
CLF-301
830 4
820 -
815 -
810 -
805
6/ 1 /2021
�'
p0
12/ 1 /2021 6/ 1 /2022
Date
3
1
0
12/ 1 /2022
0..
00
00
G
Q
Z
4j
LL
C
O
1Z
M
_O
W
O
G7
J
4-1
O
M
0-.
00
00
C
Q
Z
++
LL
C
O
I
M
07
W
07
07
J
L
�i
CLF-302
815
814
813
812
811
810
809
4
3
C
2 `-o
M
C
.M
OC
1
0
7/ 15/2021 8/ 14/2021 9/ 13/2021 10/ 13/2021 11 / 12/2021 12/ 12/2021
Date
CLF-302 - Total water level change from transducer installation on 07/27/2021 to 12/07/2021 is -3.7 feet.
CLF-302
820 4
1-31M
810 -
805 -
795
6/1/2021
O
_
O � \
12/ 1 /2021 6/ 1 /2022
Date
3
1
0
12/ 1 /2022
LEGEND Notes:
DUKE
DRAWN BY: D.AVARD DATE:07/21/2021
FIGURE 3I
Cell 5 construction start (05/31/2021) NAVD 88 — North American
� ENERGY
REVISED BY: D.AVARD DATE:01/24/2022
HYDROGRAPHS —INDUSTRIAL LANDFILL NO 1.
Future phases 3 through 5 CCR excavation start 06/18/2021
p g ( ) Vertical Datum 1988
CAROLINAS
CHECKED BY: T. COLTON DATE:01/24/2022
(1812-INDUS) PHASE 2 EXPANSION
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft - Feet
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) in - Inches
APPROVED BY: T.COLTON DATE:01/24/2022
OCTOBER 2021 THROUGH DECEMBER 2021
Shallow Groundwater Flow Zone (Transducer Data)
— — - Transient Groundwater Model water level predicted trend Manual Water Level Measurement
116'
S)/r1Ta
PROJECT MANAGER:T.COLTON
MARSHALL STEAM STATION
Daily Total Rainfall (inches)
www.synterracorp.com
TERRELL, NORTH CAROLINA

00
00
G
Q
Z
4j
LL
C
O
_O
W
O
0)
J
L
O
00
00
C
Q
Z
4j
LL
C
O
M
07
W
07
07
J
L
�1
M
►-
CLF-303
803
802
801
800
799
798
797
4
3
C
2
M
C
.M
OC
1
0
7/ 15/2021 8/ 14/2021 9/ 13/2021 10/ 13/2021 11 / 12/2021 12/ 12/2021
Date
CLF-303 - Total water level change from transducer installation on 07/27/2021 to 01/01/2022 is -1.3 feet.
CLF-303
810 4
:m
795
790
785 J-9"m
6/ 1 /2021
., v o 0
MGM,-
12/ 1 /2021 6/ 1 /2022
Date
3
1
I 0
12/ 1 /2022
0.1%
00
00
G
Q
Z
++
LL
C
O
1Z
M
_O
W
O
G7
J
L
O
M
00
00
C
Q
Z
++
LL
C
O
I
M
07
W
07
07
J
L
�i
i
CLF-304
801
800
799
798
797
796
795
4
3
C
2 `-o
M
C
.M
OC
1
0
7/ 15/2021 8/ 14/2021 9/ 13/2021 10/ 13/2021 11 / 12/2021
Date
CLF-304 - Total water level change from transducer installation on 07/27/2021 to 01/01/2022 is -0.5 feet.
CLF-304
810 4
805
:M
795
790
i-
-
785 1 9 '
6/1/2021
�maglm�e.
12/ 1 /2021 6/ 1 /2022
Date
3
1
T 0
12/ 1 /2022
LEGEND Notes:
DUKE
DRAWN BY: D.AVARD DATE:07/21/2021
FIGURE 33
Cell 5 construction start (05/31/2021) NAVD 88 — North American
� ENERGY
REVISED BY: D.AVARD DATE:01/24/2022
HYDROGRAPHS —INDUSTRIAL LANDFILL NO 1.
Future phases 3 through 5 CCR excavation start 06/18/2021
p g ( ) Vertical Datum 1988
CAROLINAS
CHECKED BY: T. COLTON DATE:01/24/2022
(1812-INDUS) PHASE 2 EXPANSION
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft - Feet
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) in - Inches
APPROVED BY: T.COLTON DATE:01/24/2022
OCTOBER 2021 THROUGH DECEMBER 2021
Shallow Groundwater Flow Zone (Transducer Data)
— — - Transient Groundwater Model water level predicted trend Manual Water Level Measurement
1167
SITa
PROJECT MANAGER: T. COLTON
MARSHALL STEAM STATION
Daily Total Rainfall (inches)
www.synterracorp.com
TERRELL, NORTH CAROLINA

CLF-401
CLF-402
00
00
G
Q
Z
4j
LL
C
O
>
_O
W
O
>
0)
J
L
O
00
00
Z
4j
LL
C
O
M
G7
W
07
>
07
J
L
�1
M
►-
818 -
817
816
815 -
814
813
812
M
3
2
M
C
OG
1
0
7/ 15/2021 8/ 14/2021 9/ 13/2021 10/ 13/2021 11 / 12/2021 12/ 12/2021
Date
CLF-401 - Total water level change from transducer installation on 07/27/2021 to 01/01/2022 is -1.5 feet.
CLF-401
820 Tr— 4
11"
810
805
:80
I"
795 1 9'
6/1/2021
I
12/ 1 /2021 6/ 1 /2022
Date
3
1
I 0
12/ 1 /2022
00
00
G
Q
Z
++
LL
C
O
1Z
M
>
_O
W
O
>
G7
J
L
O
M
00
00
Z
++
LL
C
O
I
M
07
W
07
>
07
J
L
�i
i
814
813
812
811
810
809
808
� o 0
4
3
C
2 `-o
M
C
.M
OG
1
0
7/ 15/2021 8/ 14/2021 9/ 13/2021 10/ 13/2021 11 / 12/2021
Date
CLF-402 - Total water level change from transducer installation on 07/27/2021 to 01/01/2022 is -2.4 feet.
CLF-402
815 4
E:3r1s
805 -
W411!
790
6/1/2021
O
0
00
12/ 1 /2021 6/ 1 /2022
Date
3
1
0
12/ 1 /2022
LEGEND Notes:
DUKE
DRAWN BY: D.AVARD DATE:07/21/2021
FIGURE 3K
Cell 5 construction start (05/31/2021) NAVD 88 - North American
� ENERGY
REVISED BY: D.AVARD DATE:01/24/2022
HYDROGRAPHS -INDUSTRIAL LANDFILL NO 1.
Future phases 3 through 5 CCR excavation start 06/18/2021
p g ( ) Vertical Datum 1988
CAROLINAS
CHECKED BY: T. COLTON DATE:01/24/2022
(1812-INDUS) PHASE 2 EXPANSION
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft - Feet
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) in - Inches
APPROVED BY: T.COLTON DATE:01/24/2022
OCTOBER 2021 THROUGH DECEMBER 2021
Shallow Groundwater Flow Zone (Transducer Data)
- - - Transient Groundwater Model water level predicted trend Manual Water Level Measurement
1167
SITa
PROJECT MANAGER: T. COLTON
MARSHALL STEAM STATION
Daily Total Rainfall (inches)
www.synterracorp.com
TERRELL, NORTH CAROLINA

CLF-403
CLF-404
01.
00
00
G
i
Q
Z
4j
LL
C
O
>
_O
W
0)
>
0)
J
L
M
�i
i
0.
00
00
C
Q
Z
4j
LL
C
O
M
G7
W
07
07
J
L
M
814 -
813
812
811 -
810 -
I�•
♦
CLF-403 was
abandoned between
December 6-7, 2021.
♦
O
4
0..
813
00
00
G
Q
812
3
Z
4j
LL
811
=
O
2
M
810
M
07
�
C
W
809
>
1
Q
J
L.
Q
808
44
3
808 0
5/20/2021 7/4/2021 8/ 18/2021 10/2/2021 11 / 16/2021 12/31 /2021
Date
CLF-403 - Total water level change from transducer installation on 07/27/2021 to 12/07/2021 is -1.6 feet.
CLF-403
820
815
810
805
800
795
790
785
6/ 1 /2021 12/ 1 /2021 6/ 1 /2022 12/ 1 /2022
Date
CLF-404 was
abandoned between
December 6-7, 2021.
�
O
O
AA
Jul :6L
O
4
3
2 `-o
1
M
C
.M
W
807 0
5/20/2021 7/4/2021 8/ 18/2021 10/2/2021 11 / 16/2021 12/31 /2021
Date
CLF-404 - Total water level change from transducer installation on 07/27/2021 to 12/07/2021 is -1.2 feet.
CLF-404
4
,1%
820
00
00
C
815
Q
3
Z
810
4+
LL
0O
805
2
M
_
G>7
800
=
W
fY
07
>
795
1
07
J
L
07
790
M
0
785
4
3
C
2 �
C
C�
1
0
6/1/2021 12/ 1 /2021 6/ 1 /2022 12/ 1 /2022
Date
LEGEND Notes:
DUKE
DRAWN BY: D.AVARD DATE:07/21/2021
FIGURE 3L
Cell 5 construction start (05/31/2021) NAVD 88 - North American
� ENERGY
REVISED BY: D.AVARD DATE:01/24/2022
HYDROGRAPHS -INDUSTRIAL LANDFILL NO 1.
Future phases 3 through 5 CCR excavation start 06/18/2021
p g ( ) Vertical Datum 1988
CAROLINAS
CHECKED BY: T. COLTON DATE:01/24/2022
(1812-INDUS) PHASE 2 EXPANSION
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft -Feet
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) in - Inches
APPROVED BY: T.COLTON DATE:01/24/2022
OCTOBER 2021 THROUGH DECEMBER 2021
Shallow Groundwater Flow Zone (Transducer Data)
- - - Transient Groundwater Model water level predicted trend Manual Water Level Measurement
116'
S)/r1Ta
PROJECT MANAGER:T.COLTON
MARSHALL STEAM STATION
Daily Total Rainfall (inches)
www.synterracorp.com
TERRELL, NORTH CAROLINA

PM
120 1 1 3
hull
20
0jlllljx!�
9/1 /2021
Notes:
1. gpm = gallons per minute.
■ Model Flow Rate (gpm)
Rainfall Daily Total (in)
X Actual Pumping Flow Rate (gpm)
Steady State Blanket Underdrain Model Flow
of 18 GPM as presented in Technical Memorandum:
Modeling Support for the ILF Phase 2 Permit to Construct Modifications
3/1 /2022 9/1 /2022 3/1 /2023
Years of Operation
IVA
1
C
L(' DUKE DRAWN BY: T. COLTON DATE: 10/13/2021 FIGURE 4A
T ENERGY REVISED BY: D. AVARD DATE: 01/14/2022 CELL 5 (UNDERDRAIN) PUMPING FLOW RATE VS. SIMULATED FLOW RATE
CAROLINAS CHECKED BY: T. COLTON DATE: 01/14/2022 GROUNDWATER CONDITIONS QUARTERLY REPORT
APPROVED BY: C. EADY DATE: 01/14/2022 OCTOBER 2021 THROUGH DECEMBER 2021
�� PROJECT MANAGER: T. COLTON MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
synTerra www.synterracorp.com

120
100
M
K11
X Actual Pumping Flow Rate (gpm)
Rainfall Daily Total (in)
X
Xxx
Ix
9/ 1 /2021 3/ 1 /2022 9/ 1 /2022
Years of Operation
Notes:
1. gpm = gallons per minute.
2. Flow data from the first day followine a Deriod of no flow were not Dlotted.
3/ 1 /2023
3
2
RE
4' DUKE DRAWN BY: T. COLTON DATE: 10/13/2021 FIGURE 4B
ENERGY REVISED BY: D. AVARD DATE: 01/14/2022 CELL 6 PUMPING FLOW RATE
CAROLINA'� CHECKED BY: T. COLTON DATE: 01/14/2022 GROUNDWATER CONDITIONS QUARTERLY REPORT
APPROVED BY: C. EADY DATE: 01/14/2022 OCTOBER 2021 THROUGH DECEMBER 2021
�� PROJECT MANAGER: T. COLTON MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
VnTerfa www.synterracorp.com

500
3
■
400
■
■
0-
22
300
■
ca
■
oc
■
_o
LL
200Ln
■
ICU
X
■ 1
vi
ca
■
a-
X
v
100 YX%
■
X Actual Pumping Flow Rate (gpm)
■ Model Flow Rate (gpm)
LL
I Rainfall Daily Total (in)
0
1 1 10
9/1/2021
3/ 1 /2022 9/ 1 /2022 3/ 1 /2023 9/ 1 /2023
Years of Operation
Notes:
1. gpm = gallons
per minute.
2. Flow data from the first day following
a period of no flow were not plotted.
L(' DUKE
DRAWN BY: T. COLTON
DATE: 10/13/2021
FIGURE 4C
T ENERGY
REVISED BY: D. AVARD
DATE: 01/14/2022
PHASE 3-5 PUMPING FLOW RATE VS. SIMULATED FLOW RATE
CAROLINAS
CHECKED BY: T. COLTON
DATE: 01/14/2022
GROUNDWATER CONDITIONS QUARTERLY REPORT
APPROVED BY: C. EADY
DATE: 01/14/2022
OCTOBER 2021 THROUGH DECEMBER 2021
It10
PROJECT MANAGER: T. COLTON
MARSHALL STEAM STATION
synTerraF--
TERRELL, NORTH CAROLINA
www.synterracorp.com

Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
TABLES
L7
synTerra
Science & Engineering Consultants

TABLE 1
GROUNDWATER MONITORING NETWORK WELL INFORMATION AND WATER LEVELS
GROUNDWATER CONDITIONS QUARTERLY REPORT
OCTOBER 2021 THROUGH DECEMBER 2021
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Date
Well/Piezometer
Installed
Date Well/Piezometer
Adandoned
Date
Transducer
Installed
Monitoring
Zone
Northing
(Ft-NAD 83)
Easting
(Ft-NAD 83)
Measuring Point
TOC Elevation
(Ft-NAVD 88)
Ground Surface
Elevation
(Ft-NAVD 88)
Total Well
Depth zs
(Ft-BGS)
Measured Well
Depth i
(Ft-TOC)
3
Screened Interval
(Ft TOC)
Top of Screen
Elevation
(Ft-NAVD 88)
Bottom of
Screen
Elevation
(Ft-NAVD 88)
Water Level
Measurement
(Ft-TOC)
11/15/2021
Groundwater
Elevation
(Ft-NAVD 88)
11/15/2021
CLF-301
5/21/2021
NA
7/27/2021
Shallow
685838.40
1413513.30
847.46
844.46
62.00
65.00
52.00
62.00
795.46
785.46
31.60
815.86
CLF-302
5/13/2021
12/6/2021 - 12/7/2021
7/27/2021
Shallow
685373.00
1413718.80
832.10
830.10
50.00
52.00
40.00
50.00
792.10
782.10
22.08
810.02
CLF-303
5/12/2021
NA
7/27/2021
Shallow
684951.10
1413840.30
824.31
822.31
40.00
42.00
30.00
40.00
794.31
784.31
24.95
799.36
CLF-304
5/24/2021
NA
7/27/2021
Shallow
684062.20
1413563.40
823.28
821.28
60.00
62.00
50.00
60.00
773.28
763.28
25.43
797.85
CLF-401
5/17/2021
NA
7/27/2021
Shallow
685783.50
1412779.50
832.44
830.44
39.00
41.00
29.00
39.00
803.44
793.44
18.19
814.25
CLF-402
5/21/2021
NA
7/27/2021
Shallow
685598.80
1413217.80
818.41
816.41
50.00
52.00
40.00
50.00
778.41
768.41
8.59
809.82
CLF-403
5/18/2021
12/6/2021 - 12/7/2021
7/27/2021
Shallow
685408.10
1412807.20
826.39
824.39
56.00
58.00
46.00
56.00
780.39
770.39
16.14
810.25
CLF-404
5/17/2021
12/6/2021 - 12/7/2021
7/27/2021
Shallow
685024.80
1412910.80
828.14
826.14
39.00
41.00
29.00
39.00
799.14
789.14
18.56
809.58
CLF21-10
8/6/2021
NA
8/6/2021
Shallow
687020.10
1412353.40
857.75
857.75
32.00
32.00
22.00
32.00
835.75
825.75
16.96
840.79
CLF21-11
8/5/2021
NA
8/5/2021
Shallow
686572.30
1412572.20
848.53
848.53
40.00
40.00
30.00
40.00
818.53
808.53
22.95
825.58
CLF21-12
8/5/2021
NA
8/5/2021
Shallow
686217.40
1412518.20
837.84
835.84
40.00
42.00
30.00
40.00
807.84
797.84
18.26
819.58
CLF21-13
8/5/2021
11/4/2021
8/5/2021
Shallow
686092.20
1412818.30
836.76
827.76
35.00
44.00
25.00
35.00
811.76
801.76
Abandoned
Abandoned
CLF21-13R
11/4/2021
NA
11/8/2021
Shallow
686085.92
1412818.66
835.75
835.5
35.00
37.00
25.00
35.00
810.75
800.75
17.21
818.54
CLF21-14
8/10/2021
NA
8/10/2021
Shallow
686027.10
1414268.70
841.56
841.56
36.00
36.00
26.00
36.00
815.56
805.56
22.75
818.81
CLF21-15
8/10/2021
NA
8/10/2021
Shallow
686307.70
1414410.00
864.37
864.37
55.00
55.00
45.00
55.00
819.37
809.37
40.24
824.13
CLF21-16
8/6/2021
10/8/2021
8/6/2021
Shallow
686542.70
1413113.40
830.85
830.35
26.00
26.50
16.00
26.00
814.85
804.85
Abandoned
Abandoned
CLF21-17
8/6/2021
12/6/2021 - 12/7/2021
8/6/2021
Shallow
686175.20
1413059.80
830.76
830.76
30.00
30.00
20.00
30.00
810.76
800.76
12.13
818.63
CLF21-18
10/9/2021
12/6/2021 - 12/7/2021
10/11/2021
Shallow
686685.42
1412751.79
834.79
831.92
25.00
25.00
15.00
25.00
819.79
809.79
10.30
824.49
CLF21-19
10/9/2021
12/6/2021 - 12/7/2021
10/11/2021
Shallow
686654.82
1413081.84
827.73
830.48
25.00
25.00
15.00
25.00
812.73
802.73
8.00
822.48
CLF21-20
10/9/2021
12/6/2021 - 12/7/2021
10/11/2021
Shallow
686373.56
1413106.91
831.55
828.43
30.00
30.00
20.00
30.00
811.55
801.55
10.80
820.75
GWA-4D
6/12/2015
NA
7/30/2021
Deep
686783.39
1411776.91
902.45
899.38
90.07
93.14
84.07
89.07
818.38
813.38
52.15
850.30
GWA-4S
5/19/2015
NA
7/30/2021
Shallow
686776.57
1411777.34
901.97
898.98
67.99
70.98
52.19
67.19
849.78
834.78
52.40
849.57
MW-4
6/30/1989
NA
7/30/2021
Shallow
686723.00
1414467.00
866.42
863.75
50.20
52.87
42.87
52.87
823.55
813.55
35.12
832.03
MW-4D
10/12/2006
NA
7/30/2021
Bedrock
686715.00
1414462.00
866.74
863.37
64.18
67.55
58.87
63.87
807.87
802.87
36.45
830.29
MW-7 (013-3)
12/16/2010
NA
7/30/2021
Shallow
685380.10
1414418.00
859.16
856.56
51.40
54.00
39.00
54.00
820.16
805.16
41.85
817.31
ILF-21)
3/31/2019
NA
7/30/2021
Deep
687699.24
1413205.78
885.14
885.57
107.00
106.57
91.57
101.57
793.57
783.57
39.79
845.35
ILF-2S
3/31/2019
NA
7/30/2021
Shallow
687699.26
1413214.68
884.79
885.21
52.00
51.58
41.58
51.58
843.21
833.21
43.70
841.09
Notes:
Well/piezometer abandoned during reporting period.
(--) - Data not available
' Well depths initially measured during well installation and updated as new wells are installed.
z 'Total Well Depth" is the depth to the bottom of the filter pack.
3 Values measured during well installation
BGS - Below ground surface
TOC - Top of casing
Ft - Feet
NA - Not applicable
NAD 83 - North American Datum of 1983
NAVD 88 - North American Vertical Datum of 1988
NM - Not measured
Prepared by: GTC Checked by: DAA
Page 1 of 1

TABLE 2
SITE -WIDE WATER LEVEL ELEVATION DATA TABLE
GROUNDWATER CONDITIONS QUARTERLY REPORT
OCTOBER 2021 THROUGH DECEMBER 2021
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Ground Surface
Elevation
(Ft-NAVD 88)
TOC Elevation
(Ft-NAVD 88)
Quarter 4 2021
Monitoring
Zone
Water Level
Measurement
(Ft-TOC)
11/15/2021
Groundwater
Elevation
(Ft-NAVD 88)
11/15/2021
Groundwater Monitoring Wells
Within the Area of Interest
CLF-301
844.46
847.46
31.60
815.86
Shallow
CLF-302
830.1
832.10
22.08
810.02
Shallow
CLF-303
822.31
824.31
24.95
799.36
Shallow
CLF-304
821.28
823.28
25.43
797.85
Shallow
CLF-401
830.44
832.44
18.19
814.25
Shallow
CLF-402
816.41
818.41
8.59
809.82
Shallow
CLF-403
824.39
826.39
16.14
810.25
Shallow
CLF-404
826.14
828.14
18.56
809.58
Shallow
CLF21-10
857.75
857.75
16.96
840.79
Shallow
CLF21-11
848.53
848.53
22.95
825.58
Shallow
CLF21-12
835.84
837.84
18.26
819.58
Shallow
CLF21-13
827.76
836.76
Abandoned
Abandoned
Shallow
CLF21-13R
835.5
835.75
17.21
818.54
Shallow
CLF21-14
841.56
841.56
22.75
818.81
Shallow
CLF21-15
864.37
864.37
40.24
824.13
Shallow
CLF21-16
830.35
830.85
10.32
820.53
Shallow
CLF21-17
830.76
830.76
12.13
818.63
Shallow
CLF21-18
831.92
834.79
10.30
824.49
Shallow
CLF21-19
830.48
827.73
8.00
819.73
Shallow
CLF21-20
828.43
831.55
10.80
820.75
Shallow
GWA-4D
899.38
902.45
52.15
850.30
Deep
GWA-4S
898.98
901.97
52.40
849.57
Shallow
ILF-2D
885.57
885.14
39.79
845.35
Deep
ILF-2S
885.21
884.79
43.70
841.09
Shallow
MW-4
864.5
867.15
35.12
832.03
Shallow
MW-4D
863.37
866.74
36.45
830.29
Bedrock
MW-7 (013-3)
856.56
859.16
41.85
817.31
Shallow
Groundwater Monitoring Wells Beyond the Area of Interest
AB-10BR
799.53
802.54
17.69
784.85
Bedrock
AB-10BRL
799.34
801.59
11.58
790.01
Bedrock
AB-10D
799.58
802.68
20.52
782.16
Bedrock
AB-10S
799.54
802.41
17.46
784.95
Shallow
AB-10SL
799.52
802.52
19.10
783.42
Shallow
AB-12BR
792.59
795.43
No Access
No Access
Bedrock
AB-12D
792.56
795.45
No Access
No Access
Bedrock
AB-12S
792.7
795.61
No Access
No Access
Shallow
AB-12SL
792.7
795.67
No Access
No Access
Shallow
AB-13D
821.59
824.55
25.80
798.75
Bedrock
AB-13S
821.21
823.73
24.60
799.13
Shallow
AB-14D
821.45
824.11
12.11
812.00
Deep
AB-14DU
822.01
824.83
12.81
812.02
Shallow
AB-14S
821.73
824.71
13.63
811.08
Shallow
AB-15BR
820.04
823.01
Abandoned
Abandoned
Bedrock
AB-15D
820.26
823.04
Abandoned
Abandoned
Bedrock
AB-15S
820.14
823.27
Abandoned
Abandoned
Shallow
AB-15SL
820.02
823.17
Abandoned
Abandoned
Shallow
AB-1BR
774.93
775.24
9.14
766.10
Bedrock
AB-1BRL
774.77
774.78
8.97
765.81
Bedrock
AB-1BRLL
774.79
774.54
8.69
765.85
Bedrock
AB-1BRLLL
775.7
775.45
8.83
766.62
Bedrock
AB-1D
774.93
774.76
10.15
764.61
Deep
AB-1S
774.75
774.53
11.65
762.88
Shallow
AB-21D
807.61
810.23
24.00
786.23
Deep
AB-21S
807.95
810.66
24.37
786.29
Shallow
AB-2BR
778.13
781.06
0.00
781.06
Bedrock
AB-2D
778.48
781.44
17.61
763.83
Deep
AB-2S
778.58
781.30
21.49
759.81
Shallow
AB-3D
812.14
815.03
30.46
784.57
Bedrock
AB-3S
812
815.08
Dry
Dry
Shallow
AB-4D
807.17
810.01
29.67
780.34
Deep
AB-4S
807.43
809.73
22.96
786.77
Shallow
AB-4SL
807.34
809.85
23.96
785.89
Shallow
AB-5BR
1 804.45
1 807.55
1 14.23
1 793.32
1 Bedrock
AB-5D
1 804.47
1 807.52
1 13.32
1 794.20
1 Deep
Page 1 of 4

TABLE 2
SITE -WIDE WATER LEVEL ELEVATION DATA TABLE
GROUNDWATER CONDITIONS QUARTERLY REPORT
OCTOBER 2021 THROUGH DECEMBER 2021
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Ground Surface
Elevation
(Ft-NAVD 88)
TOC Elevation
(Ft-NAVD 88)
Quarter 4 2021
Monitoring
Zone
Water Level
Measurement
(Ft-TOC)
11/15/2021
Groundwater
Elevation
(Ft-NAVD 88)
11/15/2021
AB-5DU
804.92
807.58
13.23
794.35
Shallow
AB-5S
804.56
807.50
13.55
793.95
Shallow
AB-6BRA
833.77
836.70
13.68
823.02
Bedrock
AB-6BRL
834.14
836.76
15.26
821.50
Bedrock
AB-6D
832.9
835.36
11.76
823.60
Bedrock
AB-6S
832.77
835.38
9.95
825.43
Shallow
AB-7D
831.21
834.13
15.08
819.05
Deep
AB-7DU
831.62
834.08
13.10
820.98
Shallow
AB-7S
831.43
834.29
13.88
820.41
Shallow
AB-8D
797.50
800.50
11.15
789.35
Bedrock
AB-8DU
797.53
800.38
11.04
789.34
Shallow
AB-8S
797.42
800.33
11.25
789.08
Shallow
AB-9BR
794.94
797.64
13.91
783.73
Bedrock
AB-9D
794.76
797.26
14.50
782.76
Bedrock
AB-9S
795.38
797.78
14.55
783.23
Shallow
AL-1BR
815.02
818.07
83.79
734.28
Bedrock
AL-1BRL
815.41
813.29
53.57
759.72
Bedrock
AL-1 D
815.05
817.94
47.04
770.90
Bedrock
AL-1S
814.93
817.97
Dry
Dry
Shallow
AL-2BR
912.78
915.10
109.21
805.89
Bedrock
AL-2BRL
912.67
915.39
117.01
798.38
Bedrock
AL-2BRLL
911.77
914.63
117.31
797.32
Bedrock
AL-2BRLLL
913.01
915.81
118.48
797.33
Bedrock
AL-2D
912.83
915.33
111.03
804.30
Deep
AL-2S
912.53
915.41
112.49
802.92
Shallow
AL-3BR
916.03
919.02
113.74
805.28
Bedrock
AL-3D
915.99
918.69
111.50
807.19
Deep
AL-3S
915.77
918.59
109.64
808.95
Shallow
AL-4BR
915.75
918.72
105.63
813.09
Bedrock
AL-4BRL
915.84
918.74
121.28
797.46
Bedrock
AL-4D
916.01
918.44
100.99
817.45
Deep
BG-1BRA
814.23
817.24
14.47
802.77
Bedrock
BG-1D
814.75
817.63
10.85
806.78
Deep
BG-1S
814.79
817.35
10.00
807.35
Shallow
BG-2BR
811.99
814.81
6.78
808.03
Bedrock
BG-2S
811.82
814.33
5.70
808.63
Shallow
BG-3BR
864.72
867.68
36.61
831.07
Bedrock
BG-3D
861.56
864.18
28.20
835.98
Deep
BG-3S
860.75
863.03
29.91
833.12
Deep
CCR-15D
802.42
805.14
17.89
787.25
Shallow
CCR-15S
802.24
804.76
BTP
BTP
Shallow
CCR-16D
816.42
819.37
25.66
793.71
Deep
CCR-16S
816.15
819.32
BTP
BTP
Shallow
CCR-1D
807.42
809.32
20.10
789.22
Deep
CCR-1S
807.34
810.31
18.18
792.13
Shallow
CCR-2D
804.12
806.89
22.89
784.00
Deep
CCR-2S
804.24
806.56
22.71
783.85
Shallow
CCR-3D
777.1
780.44
22.70
757.74
Deep
CCR-3S
777.39
780.28
23.15
757.13
Shallow
CCR-4D
780.94
783.82
24.30
759.52
Deep
CCR-4S
780.85
783.66
25.02
758.64
Shallow
CCR-5D
774.24
776.97
16.73
760.24
Deep
CCR-5S
774.23
777.25
18.07
759.18
Shallow
CCR-9DA
796.84
799.77
36.30
763.47
Deep
CCR-9S
796.91
799.88
38.25
761.63
Shallow
CP-1BR
803.45
806.32
22.85
783.47
Bedrock
CP-1D
803.66
806.40
23.15
783.25
Deep
CP-1S
803.47
806.32
BTP
BTP
Shallow
CP-2D
807.95
810.83
16.31
794.52
Deep
CP-2S
807.79
810.67
16.02
794.65
Shallow
CP-3D
807.69
810.58
17.60
792.98
Deep
CP-3S
807.81
810.47
BTP
BTP
Shallow
GP-1D
855
858.03
57.59
800.44
Deep
GP-1S
855.13
858.13
57.76
800.37
Shallow
GP-2D
830.73
833.68
29.04
804.64
Deep
Page 2 of 4

TABLE 2
SITE -WIDE WATER LEVEL ELEVATION DATA TABLE
GROUNDWATER CONDITIONS QUARTERLY REPORT
OCTOBER 2021 THROUGH DECEMBER 2021
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Ground Surface
Elevation
(Ft-NAVD 88)
TOC Elevation
(Ft-NAVD 88)
Quarter 4 2021
Monitoring
Zone
Water Level
Measurement
(Ft-TOC)
11/15/2021
Groundwater
Elevation
(Ft-NAVD 88)
11/15/2021
GP-2S
830.52
833.45
28.48
804.97
Shallow
GP-3D
853.53
856.46
52.88
803.58
Deep
GP-3S
853.46
856.39
52.72
803.67
Shallow
GWA-10D
775.27
778.10
27.53
750.57
Deep
GWA-10S
775.32
777.65
22.03
755.62
Shallow
GWA-11BR
807
810.03
80.00
730.03
Bedrock
GWA-11D
808.24
811.24
78.79
732.45
Deep
GWA-11S
809.59
812.55
BTP
BTP
Shallow
GWA-12BR
876.02
875.65
17.11
858.54
Bedrock
GWA-12D
876.29
875.83
15.57
860.26
Bedrock
GWA-12S
888.01
887.87
16.71
871.16
Shallow
GWA-13DA
888.14
888.28
24.06
864.22
Deep
GWA-13S
888.01
887.87
19.03
868.84
Shallow
GWA-14D
911.48
911.41
39.70
871.71
Deep
GWA-14S
911.24
910.69
38.60
872.09
Shallow
GWA-15D
778.96
781.85
30.17
751.68
Deep
GWA-15S
778.53
781.39
29.62
751.77
Shallow
GWA-1BR
803.15
806.10
42.08
764.02
Bedrock
GWA-1D
803.27
806.05
45.08
760.97
Deep
GWA-1S
803.16
805.97
45.85
760.12
Shallow
GWA-2DA
823.79
826.59
24.60
801.99
Deep
GWA-2S
823.91
826.97
24.35
802.62
Shallow
GWA-3D
836.48
839.44
2.55
836.89
Deep
GWA-3S
836.42
839.24
2.50
836.74
Shallow
GWA-5D
844.36
847.17
33.72
813.45
Deep
GWA-5S
844.3
847.22
BTP
BTP
Shallow
GWA-6D
843.32
845.72
37.61
808.11
Bedrock
GWA-6S
842.99
845.37
36.84
808.53
Shallow
GWA-7D
809.55
812.50
11.15
801.35
Deep
GWA-7S
807.8
810.72
13.34
797.38
Shallow
GWA-8D
850.59
853.68
31.15
822.53
Bedrock
GWA-8S
849.75
852.90
28.58
824.32
Shallow
GWA-9BR
845.53
848.45
0.35
848.10
Bedrock
MS-10
848.29
851.29
18.95
832.34
Shallow
MS-11
856.87
859.78
35.11
824.67
Shallow
MS-12
832.7
835.66
23.62
812.04
Shallow
MS-13
839.19
841.90
31.23
810.67
Shallow
MS-14
841.27
844.07
35.62
808.45
Shallow
MS-15
858.42
861.47
40.55
820.92
Shallow
MS-16
834.25
836.98
25.88
811.10
Deep
MS-8
869.35
872.34
42.09
830.25
Shallow
MS-9
865.36
868.04
39.43
828.61
Shallow
MW-1
821.2
823.70
BTP
BTP
Shallow
MW-10D
770
772.04
16.40
755.64
Deep
MW-10S
769.74
772.05
16.62
755.43
Shallow
MW-11D
881.95
884.67
41.53
843.14
Deep
MW-11S
882.01
884.99
41.76
843.23
Shallow
MW-12D
869.01
871.88
17.49
854.39
Deep
MW-12S
869.02
871.86
17.03
854.83
Deep
MW-13D
844.44
847.05
0.68
846.37
Deep
MW-13S
844.9
847.49
2.21
845.28
Shallow
MW-14BR
807.65
810.49
47.72
762.77
Bedrock
MW-14BRL
809.05
811.77
44.13
767.64
Bedrock
MW-14D
808.67
811.43
43.88
767.55
Deep
MW-14S
808.23
811.29
BTP
BTP
Shallow
MW-2
794.9
797.21
11.83
785.38
Shallow
MW-3
811
813.07
8.24
804.83
Shallow
MW-6D
788.15
791.19
27.47
763.72
Deep
MW-6S
787.46
790.35
Dry
Dry
Shallow
MW-7D
772.9
776.85
12.69
764.16
Deep
MW-7S
773.1
775.99
16.90
759.09
Shallow
MW-8D
771.34
775.18
16.51
758.67
Bedrock
MW-8S
771.54
775.34
18.32
757.02
Shallow
MW-9D
774.34
777.38
19.48
757.90
Deep
MW-9S
774.22
777.34
18.56
758.78
Shallow
Page 3 of 4

TABLE 2
SITE -WIDE WATER LEVEL ELEVATION DATA TABLE
GROUNDWATER CONDITIONS QUARTERLY REPORT
OCTOBER 2021 THROUGH DECEMBER 2021
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Ground Surface
Elevation
(Ft-NAVD 88)
TOC Elevation
(Ft-NAVD 88)
Quarter 4 2021
Monitoring
Zone
Water Level
Measurement
(Ft-TOC)
11/15/2021
Groundwater
Elevation
(Ft-NAVD 88)
11/15/2021
013-1(CAMA)
847.59
825.85
Abandoned
Abandoned
Shallow
PVSF-1BR
877.36
880.17
51.81
828.36
Bedrock
PVSF-1D
877.55
880.28
48.33
831.95
Deep
PVSF-1S
877.62
880.27
47.56
832.71
Shallow
PVSF-2BR
830.48
833.36
Abandoned
Abandoned
Bedrock
PVSF-2BRL
830.03
832.84
Abandoned
Abandoned
Bedrock
PVSF-2D
830.44
833.20
Abandoned
Abandoned
Deep
PVSF-2S
830.44
833.15
Abandoned
Abandoned
Shallow
PVSF-3BR
835.38
838.22
Abandoned
Abandoned
Bedrock
PVSF-3D
835.44
838.02
Abandoned
Abandoned
Deep
PVSF-3S
835.17
838.18
Abandoned
Abandoned
Shallow
PVSF-4BR
858.66
858.45
12.21
846.24
Bedrock
PVSF-4D
858.78
858.58
9.83
848.75
Deep
PVSF-4S
858.74-1
858.57
9.27
849.30
Shallow
Notes•
'Artesian conditions present
TOC - Below Top of Casing
BTP - Water Level below top of pump
Dry - Groundwater not measurable within well screen or riser at time of gauging event
Ft - feet
NAVD 88 - North American Vertical Datum of 1988.
NM - Not measured/available
Prepared by: GTC Checked by: DAA
Revised by: DAA 12/02/2021
Page 4 of 4

Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
APPENDIX A
WATER LEVEL MONITORING DATA FILES
INCLUDED AS EXCEL FILE
41P
synTerra
Science & Engineering Consultants

Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
APPENDIX B
GROUNDWATER MODEL PREDICTED TREND FILES
INCLUDED AS EXCEL FILE
41P
synTerra
Science & Engineering Consultants

Groundwater Conditions Quarterly Report — October 2021 to December 2021
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
APPENDIX C
DEWATERING/UNDERDRAIN PUMPING DATA
FILES
INCLUDED AS EXCEL FILE
41P
synTerra
Science & Engineering Consultants