1812_DukeMarshall_2024 Q3 ILF GWCR_FID1906836_20241030

(� DUKE
ENERGY
November 1, 2024
North Carolina Department of Environmental Quality
Division of Waste Management
Solid Waste Section
2090 U.S. Highway 70
Swannanoa, NC 28778
Attn: Ms. Sarah Moutos (submitted electronically)
Re: Groundwater Condition Quarterly Report - July 2024 through September 2024
Industrial Landfill No.1
Permit No.: 1812-INDUS-2008
Marshall Steam Station
Terrell, North Carolina 28682
Dear Ms. Moutos:
525 S. Tryon St.
Charlotte NC, 28202
In accordance with the NCDEQ DWM September 17, 2021, Phase 2 Permit Modification Approval letter (FID
1609547), 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, 4, and 5. The report is
for the quarterly period of July 2024 through September 2024 (Q3 2024).
The quarterly report includes an analysis of groundwater levels and underdrain pump flowrates within Phases
2, 3 and 4, with an updated water level map, hydrographs, pump flowrate plot, and well construction and water
level data tables. An evaluation of groundwater levels and pump flowrates compared to model predictions is
included. Groundwater transducer data, groundwater model trend data, and underdrain pumping 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 (Q4 2024) will be submitted by February 1, 2024.
If you need additional information regarding this submittal do not hesitate to email or call me at
Anne.Davin(cD_duke-energy.com or [phone].
Respectfully submitted,
awli- kc>,��
Anne Davin, E.I.
Environmental Services
Attachments: Industrial Landfill No.1 (1812-INDUS-2008) Groundwater Conditions Quarterly Report - July
2024 through September 2024 (SynTerra; October 2024)
Appendices in excel format:
1) Appendix A Water Level Monitoring Data Files
2) Appendix B Groundwater Model Predicted Trend Files
3) Appendix C Underdrain Pumping Data Files
4) Appendix D Mann -Kendall Results
cc (via e-mail): Deana Yitbarek, NCDEQ
www.duke-energy.com Page 1 of 2

Elizabeth Werner, NCDEQ
Sherri Stanley, NCDEQ
Scott Saunders, Duke Energy
Dan Zakary, Duke Energy
Jake Muessen, Duke Energy
Ashley Healy, Duke Energy
Tyler Hardin, Duke Energy
Ed Sullivan, Duke Energy
Thomas Colton, SynTerra
www.duke-energy.com Page 2 of 2

41P
synTerra
Science & Engineering Consultants
synterracorp.com
GROUNDWATER CONDITIONS QUARTERLY REPORT -
•JULY 2024 TO SEPTEMBER 2024
INDUSTRIAL LANDFILL NO. 1
(1812-INDUS-2008)
FOR
MARSHALL STEAM STATION
8320 EAST CAROLINA HIGHWAY 150
TERRELL, NC 28682
OCTOBER 30, 2024
PREPARED FOR
DUKE
ENERGY
CAaOI
DUKE ENERGY CAROLINAS, LLC
n�— ,ff} Kathy�bb, NC LG #1328 ���` �� CA ��
David Avard
Senior Peer Review *`. �tssl-
Project Scientist
- SEAL
- � 051iG67 '• -
�J
r„f�r�I,iw�wtitirix, Gordon Thomas Colton, NC PE #056667
Associate Engineer

Groundwater Conditions Quarterly Report — July 2024 to September 2024
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
ILl 1RX919141910Ill I I►kM
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 and Model Trends ....................................................... 2-1
2.3 Underdrain Pump Performance...................................................................................2-3
3.0 QUARTERLY WATER -LEVEL REDUCTION ACTIVITIES ................................................... 3-1
4.0 REFERENCES.............................................................................................................4-1
October 2024
Page i
Project: 00.0083.46.11

Groundwater Conditions Quarterly Report — July 2024 to September 2024
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
IR1t11129141111:1*1
Figure 1
Monitoring Location Map
Figure 2
Area of Focus Water -Level Map — Upper Flow Zone (June 2024)
Figure 3A
Upgradient of Phase 2 Expansion (ILF-2S/D and MW-4/D)
Figure 313
Upgradient of Phase 2 Expansion (GWA-4S/D and CLF21-10)
Figure 3C
Within Phase 2 Expansion (CLF-UD and CLF21-11)
Figure 3D
Within Phase 2 Expansion (CLF21-12 and CLF21-13R)
Figure 3E
Within Phase 2 Expansion (CLF21-14R and CLF21-15)
Figure 3F
Downgradient of the Phase 2 Expansion (CLF-401 and CLF-402)
Figure 3G
Downgradient of the Phase 2 Expansion (CLF22-306 and CLF22-307)
Figure 3H
Downgradient of the Phase 2 Expansion (CLF23-405 and CLF23-406)
Figure 31
Downgradient of the Phase 2 Expansion (CLF23-407 and CLF23-408)
Figure 3J
West of the Phase 2 Expansion (CLF24-505)
Figure 3K
Southwest of the Future Phase 5 Expansion (CLF24-501 and CLF24-502)
Figure 3L
West of the Future Phase 5 Expansion (CLF24-503 and CLF24-504)
Figure 4
Cell 5 (Underdrain) Pumping Flow Rate Vs. Simulated Flow Rate
LIST OF TABLES
Table 1 Groundwater Monitoring Network Well Information and Water Levels
LIST OF APPENDICES
Appendix A Water -Level Monitoring Data Files
Appendix B Groundwater Model Predicted Trend File
Appendix C Underdrain Pumping Data Files
Appendix D Mann -Kendall Data
October 2024
Page H
Project: 00.0083.46.11

Groundwater Conditions Quarterly Report — July 2024 to September 2024
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
CCR
Duke Energy
DWM
Future Phases
gpm
ILF
NCDEQ
NPDES
reporting period
Site
I1[3t11]y_T4.1111►VIA1li_VUZI 13:ATJr_'%V[11]► l
coal combustion residuals
Duke Energy Carolinas, LLC
Division of Waste Management
ILF Phases 3, 4, and 5 expansion
gallons per minute
Industrial Landfill 1812-INDUS-2008
North Carolina Department of Environmental Quality
National Pollutant Discharge Elimination System
third quarter 2024 (July 2024 to September 2024)
Marshall Steam Station
October 2024
Page Hi
Project: 00.0083.46.11

Groundwater Conditions Quarterly Report —July 2024 to September 2024
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 on behalf of Duke Energy
Carolinas, LLC (Duke Energy) to document the water -level monitoring data and underdrain
pumping records in the vicinity of the Industrial Landfill No.1 (ILF) (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
(FID 1609547).
Data collected during the third quarter of 2024 (July 2024 to September 2024) reporting period
were used to evaluate groundwater conditions for the ILF Phase 2 expansion (includes Cell 5
and Cell 6) and ILF Future Phases 3, 4, and 5 expansion (Future Phases). Water levels are
monitored at 25 piezometers and monitoring wells and the ILF underdrain. Specifically, this
report evaluates the groundwater levels, underdrain pumping flow rates, and efforts to
expedite reducing and maintaining groundwater levels near the ILF during the reporting period.
1.2 Key Findings
Key findings of the evaluation conducted during this reporting period include:
• Groundwater levels in the area are stable or decreasing since monitoring began in
July 2021.
During the reporting period, water levels are stable or decreasing at 24 out of 25
locations; MW-4D, located upgradient of the area, exhibited increasing trends for the
reporting period. Locations where water levels are greater than model predictions can
be attributed to a slower basin excavation rate than assumed in the model.
• The Cell 5 underdrain pump has been operational for 37 months. During the reporting
period, the average pumping rate has been approximately 8.7 gallons per minute (gpm),
an increase compared to the previous reporting period (7.7 gpm). This increase is likely
due to increased precipitation during the reporting period. While the flow rates vary,
the overall trends reasonably match the model predictions. The model predicted the
underdrain to become dry after approximately 19 months of operation; however, the
slower basin excavation rate has extended the period needed to operate the
underdrain.
October 2024
Page 1-1
Project: 00.0083.46.11

Groundwater Conditions Quarterly Report —July 2024 to September 2024
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 shown on Figure 1.
Piezometer and groundwater well construction information (including water level and
groundwater elevations) for the monitoring network is included in Table 1.
2.1 Current Groundwater Conditions
Area of focus water levels were collected on October 7, 2024, for the upper (shallow) flow zone
and were used to generate a groundwater level map (Figure 2). Observed groundwater levels
during this reporting period indicate:
• Groundwater is generally flowing north to south through the ILF area (Figure 2).
• Groundwater levels in wells within and near the ILF are similar to groundwater levels
from the second quarter of 2024, except for upgradient well, MW-41D, where water
levels increased.
• Underdrain operations in Cell 5 have maintained a cone of groundwater depression
around the Cell 5 blanket underdrain sump (CLF-UD, Figure 2).
2.2 Groundwater Trends
A series of transducers installed in groundwater monitoring wells, piezometers, and the Cell 5
underdrain (CLF-UD) pump are used to monitor water -level trends from as early as July 2021 through
September 2024 (Figures 3A through 3L). The following are key observations of overall trend data:
Groundwater level data collected from July 2021 (when close monitoring started)
through September 2024 were evaluated using Mann -Kendall analysis to determine
water -level trends over the monitored period (Appendix D). Statistically significant
decreasing overall trends were observed in 18 of 25 locations. At the remaining
locations (CLF21-12, CLF21-14/14R, and CLF24-501 through CLF24-505), overall stable
groundwater levels were observed.
• Generally, decreasing or stable trends were observed in locations downgradient of the
Future Phases area during the reporting period (July 2024 through September 2024).
MW-41D, where increasing trends were observed during the reporting period, is located
upgradient/side gradient of and on the northeastern edge of Phase 2.
2.2.1 Water -Level Hydrographs and Model Trends
Pressure transducers are used to record high -resolution groundwater elevation data for
evaluation of groundwater conditions resulting from dewatering and excavation.
Transducer data in Excel spreadsheets are included in Appendix A. Manual water -level
measurements and transducer records were used to generate hydrographs. Predicted
groundwater level trends from the transient groundwater models are included in the
hydrographs (Figures 3A through 3L). Appendix B contains Excel spreadsheets with the
predicted transient groundwater level trends exported from the models.
October 2024 Page 2-1
Project: 00.0083.46.11

Groundwater Conditions Quarterly Report —July 2024 to September 2024
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
Upgradient of the Phase 2 Expansion:
Water levels upgradient of the Phase 2 Expansion are generally stable with the
exception of MW-41D which exhibited an increasing trend during the reporting period.
Water level trends at all upgradient locations show overall decreasing trends from the
start of monitoring, July 2021, to this monitoring period. The increasing trends at MW-
4D observed during this monitoring period are attributed to increased precipitation and
excavation delays, however decreasing trends are expected as excavation continues.
Information regarding the water level trends for the reporting period and overall
monitoring period are detailed below.
Location
ID
Flow
Zone
Reporting
Period Trend
Overall
Trend
Location
Plot
MW-4
Shallow
Stable
Decreasing
East of the ILF Phase 2 expansion
Figure 3A
MW-4D
Deep
Increasing
Decreasing
East of the ILF Phase 2 expansion
Figure 3A
ILF-2S
Shallow
Stable
Decreasing
North of the ILF
Figure 3A
ILF-21)
Deep
Stable
Decreasing
North of the ILF
Figure 3A
Shallow
Stable
Decreasing
West of the ILF Phase 2 expansion
Figure 3B
L
Deep
Stable
Decreasing
West of the ILF Phase 2 expansion
Figure 3B
Shallow
Stable
Decreasing
West of the ILF Phase 2 expansion
Figure 3B
Within the Phase 2 Expansion:
A transducer, identified as CLF-UD (Figure 1), was installed to monitor the Cell 5
underdrain sump water level with the temporary pump operations while the landfill cell
was under construction. In October 2022, a permanent pump was installed; since then
the water level has been recorded manually every week. The water levels within the
sump demonstrate that the underdrain continues to operate as intended, maintaining a
steady water level controlled by the pump settings (Figure 3C).
Perimeter of the Phase 2 Expansion, Outside of Cell 5 and Cell 6:
Water levels at the perimeter of the Phase 2 Expansion are decreasing or stable.
Information regarding the water level trends for the reporting period and overall
monitoring period are detailed below.
Location ID
Flow
Zone
Reporting
Period Trend
Overall
Trend
Location
Plot
CLF21-11
Shallow
Stable
Decreasing
West of Cell 5
Figure 3C
CLF21-12
Shallow
Stable
Stable
Southwest of Cell 5
Figure 3D
CLF21-13R
Shallow
Stable
Decreasing
South of Cell 5
Figure 3D
CLF21-14R
Shallow
Stable
Stable
East of Cell 6
Figure 3E
CLF21-15
Shallow
Stable
Decreasing
East of Cell 6
Figure 3E
CLF24-505
Shallow
Stable
Stable
West of Cell 5
Figure 3.1
October 2024 Page 2-2
Project: 00.0083.46.11

Groundwater Conditions Quarterly Report —July 2024 to September 2024
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
Downgradient of the Phase 2 Expansion (Future Phases Area):
Water levels downgradient of the Phase 2 Expansion are decreasing or stable.
Information regarding the water level trends for the reporting period and overall are
detailed below.
Flow
Reporting
Location ID
Overall Trend
Location
Plot
Zone
Period Trend
Within Future Phases 4 & 5
CLF-401
Shallow
Decreasing
Decreasing
Figure 3F
Expansion
Within Future Phases 4 & 5
CLF-402
Shallow
Stable
Decreasing
Figure 3F
Expansion
Downgradient of the Future
CLF22-306
Shallow
Stable
Decreasing
Figure 3G
Phase 3 Expansion
Downgradient of the Future
CLF22-307
Shallow
Stable
Decreasing
Figure 3G
Phase 3 Expansion
CLF23-405
Shallow
Stable
Decreasing
In the Future Phase 3 and 4
Figure 3H
CLF23-406
Shallow
Stable
Decreasing
In the Future Phase 3 and 4
Figure 3H
CLF23-407
Shallow
Decreasing
Decreasing
In the Future Phase 3 and 4
Figure 31
CLF23-408
Shallow
Stable
Decreasing
In the Future Phase 3 and 4
Figure 31
CLF24-501
Shallow
Stable
Stable
Southwest of Future Phase 5
Figure 3K
CLF24-502
Shallow
Stable
Stable
Southwest of Future Phase 5
Figure 3K
CLF24-503
Shallow
Stable
Stable
West of Future Phase 5
Figure 3L
CLF24-504
Shallow
Stable
Stable
West of Future Phase 5
Figure 3L
2.3 Underdrain Pump Performance
An underdrain pump is installed within the Cell 5 underdrain (CLF-UD) (Figure 1). The
underdrain pump removes groundwater from below the ILF Phase 2, Cell 5. The Cell 5
underdrain pump does not receive precipitation runoff; the underdrain is enclosed. Water
removed by the pump is discharged to the lower portion of the ash basin where it is ultimately
pumped through a water treatment system and discharged through a National Pollutant
Discharge Elimination System (NPDES) outfall. The Cell 5 underdrain pumping and model -
predicted pumping rates are shown on Figure 4.
The Cell 5 underdrain pump has been operational for 37 months, at an average pumping rate
for the reporting period of 8.7 gpm. ILF Cell 5 pumping data, including the calculated monthly
total volume pumped and monthly average flow rate are included in Appendix C.
October 2024
Page 2-3
Project: 00.0083.46.11

Groundwater Conditions Quarterly Report — July 2024 to September 2024
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
Pumping operations for the Cell 5 underdrain have removed approximately 0.9 million gallons
of water during the reporting period. The Cell 5 underdrain average flow rates for the reporting
period and each month are listed below.
• The Cell 5 underdrain pump had an average flow rate of 8.7 gpm overall during the
reporting period and monthly average flow rates of:
o 8.3 gpm during July 2024
o 6.5 gpm during August 2024
o 11.3 gpm during September 2024
October 2024
Page 2-4
Project: 00.0083.46.11

Groundwater Conditions Quarterly Report — July 2024 to September 2024
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:
Phase 2, Cell 5
• Underdrain operations continued, with an average flow rate of approximately 8.7 gpm.
• Cell 5 operations continue.
Phase 2, Cell 6
• Cell 6 operations began on October 9, 2023 and continue.
Phase 3, Cell 7
• The ILF Phase 3 permit to construct was received on December 29, 2023.
• The ILF Phase 3 construction is anticipated to start by Summer 2025 with preparation of
the landfill footprint with excavation and removal of ash underway.
Future Phases
• Piezometers CLF24-501, CLF24-502, CLF24-503, CLF24-504, and CLF24-505 were
installed in August 2024 and monitoring began.
• Passive dewatering and excavation of coal combustion residuals (CCR) in the Future
Phases continued during the reporting period.
October 2024
Page 3-1
Project: 00.0083.46.11

Groundwater Conditions Quarterly Report —July 2024 to September 2024
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.
October 2024
Page 4-1
Project: 00.0083.46.11

Groundwater Conditions Quarterly Report —July 2024 to September 2024
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
FIGURES
41P
synTerra
Science & Engineering Consultants

_ a
A
CLF21-10
890 866 • ' �. .ei' x' _ t���!�F.'jF� � ` ■ r Zia i;
GWA-4S/D B7o c .. s• it r �
CLF21-18 8i0 CLF21-19
CLF21-11 830
CLF21-16��
� - CLF21-20
CLF-UD Mill!
LEGEND
CLF21-15
F21 12 LONG-TERM PIEZOMETER AND/OR
CL
CLF24-CL Ct I_ GROUNDWATER MONITORING WELL
50 LF21-17 �„_
CLF21-13 ' ¢ TEMPORARY PIEZOMETER
CLF21-13R �'= CLF21-14R UNDERDRAIN PUMP
■ r SAp �?" ABANDONED PIEZOMETER
° L I. I l- �_-- 1- - . :�- „ �y° ASH BASIN WASTE BOUNDARY
s5 a5o - F Jt�
e8 aA° , CLF23-407 �° GEOGRAPHIC LIMITATION
°
s3o CLF-401 t- e - - LANDFILL COMPLIANCE BOUNDARY
ezo 1 ;■ a1° 1 STRUCTURAL FILL BOUNDARY
CLF24-504 r • $ao LANDFILL BOUNDARY
LEACHATE BASIN
CLF23-406o �, DUKE ENERGY CAROLINAS PROPERTY LINE
CLF24-5o3 CLF-402 TOPOGRAPHIC CONTOUR (10- INTERVAL)
CLF 403 CLF-302 OB-3 (MW-7)
- —30 STREAM (MCKIM &CREED)
CLF23-408 CLF22-305 NOTES: WETLAND (MCKIM & CREED)
_
_ m
CLF24-502 CLF24-501 1. THE CLF-UD LOCATION WAS FORMERLY KNOWN AS CELL 5 PUMP.
2.ALL BOUNDARIES ARE APPROXIMATE
,
CLF-40 CLF22-306
�� ��0 0. THE STREAMS AND WETLANDS JURISDICTIONAL DETERMINATION WAS APPROVED
- - - - - ' CLF-3D3 ■ _ r _ BY THE US ARMY CORPS OF ENGINEERS ON OCTOBER 25, 2017 (SAW-2015-01412).
CLF23-405 WETLANDS AND STREAMS BOUNDARIES WERE OBTAINED FROM AMEC FOSTER
5, tWHEELER ENVIRONMENTAL AND INFRASTRUCTURE, INC. NATURAL RESOURCES
_ r M TECHNICAL REPORT (NRTR) DATED JUNE 2015.
0
4. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
' O
5. THE TOPOGRAPHY IS SHOWN FOR REFERENCE PURPOSES ONLYAND SHOULD
NOT BE USED FOR DESIGN OR ENGINEERING PURPOSES. TOPOGRAPHY PROVIDED
BY TRANSASH.
R. AERIAL IMAGERY IS COMBINATION OF DUKE ENERGY PROPELLER AERIAL
PHOTOGRAPHY COLLECTED ON OCTOBER 1, 2024, AND MAXAR SATELLITE IMAGERY
�•`�` -a,� �� CLF22-307 OBTAINED FROM ESRI ONLINE, COLLECTED ON AUGUST 23, 2021.
7. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
CLF-304 COORDINATE SYSTEM PIPS 3200 (NAD83).
GRAPHIC SCALE
DUKE 200
`840. - �., � 'Y � '� - s •A � o zoo 400 FIGURE 1
ENERGY NFEET, MONITORING LOCATION MAP
DRAWN RY T. KING DATE: /2022 GROUNDWATER CONDITIONS QUARTERLY REPORT
10 -) ._ - 1♦+ � i} Y a /
REVISED By, L.FOREMAN DATE SO/09O9/2024 JULY 2024 THROUGH SEPTEMBER 2024
CHECKED BY: T. COLTON DATE: 10/09/2024 MARSHALL STEAM STATION
_ - - APPROVEDBY T COLTON DATE: 10/09/2024
imp
synTerra PROJECT MANAGER: T COLTON TERRELL, NORTH CAROLINA
_ •�`��Nol www.37nterracorp.com
G:\0 ARCGES PRO PROJECT5\DUKE ENERGY\NIAR3HALL\2024\GW CONDITIONS QUARTERLY REPORT\GW CONDITIONS QUARTERLY REPORTAPRX

ILF-2S�; ■
" I840.30
9 �
. 14,
♦ III .?.• 1
Y' ♦/ 7 d CLF21-10
840.53
a .; - s30
GWA-4Sssa
s80 s90 i MW-4
LEGEND
847.05 Via, -
870 829.52 MW-6S
827.5 ss° `! WELL ID
` (NAVD 88 LEVEL a
WATER , FEET )
g25.50 0 BACKGROUND MONITORING WELL
�_•r �� . s2s QIII MONITORING WELL
CLF-UU 22.5 % � PIEZOMETER
811.80 `�°, _ CLF21-15 UNDERDRAIN PUMP
'v 823.27 -+ -INFERRED WATER LEVEL CONTOUR (2.5' INTERVAL)
`r CLF21-12
819.87 GROUNDWATER FLOW DIRECTION
' CLF24-505 FUTURE PHASES
828.60 CLF21-13R
ASH BASIN WASTE BOUNDARY
c CLF21-14R
819,31 - - - GEOGRAPHIC LIMITATION
LANDFILL COMPLIANCE BOUNDARY
-� 810�.
STRUCTURAL FILL BOUNDARY
LANDFILL BOUNDARY
ti
sao eaO - f • --�f ' 801.02 802.5 -•. 800.04 �- �
�',,:' LANDFILL CELL 5AND 6 BOUNDARY
sou S y a°S,l. I'`� }.�, 4 LEACHATE BASIN
ao zgl CLF 402 / / }
DUKE ENERGY CAROLINAS PROPERTY LINE
t. TOPOGRAPHIC CONTOUR (10' INTERVAL)
e? • +', CLF23-406 �� ' �r �..,:ir f'` ._ a$ 9`; - . - • STREAM (MCKIM & CREED)
r �o CLF24-503 WETLAND (MCKIM & CREED)
i ' rr, 92S CLF23-408 =,.��, �' �� NOTES:_
(I790.47 i` `I '� 1. WATER LEVELS WERE COLLECTED ON 1017/24,ASIDE FROM CLF23-406 WHICH
WAS COLLECTED 913124.
o ' -'• ';x; - - CLF24-502 CLF24-501 7g0 >} G `' _ y�: - 2. ELEVATIONS ARE REFERENCED TO THE NORTH AMERICAN VERTICAL DATUM OF
794.76 792.95 ? 1988 (NAVD 88).
'�' - �• �� -L• _ CLF22-306 -^' - - S - 3. THE STREAMS AND WETLANDS JURISDICTIONAL DETERMINATION WAS
F NM APPROVED BY THE US ARMY CORPS OF ENGINEERS ON OCTOBER 25, 2017
, aw d • (SAW-2015-01412). WETLANDS AND STREAMS BOUNDARIES WERE OBTAINED FROM
CLF23-405 r - - �' " -- AMEC FOSTER WHEELER ENVIRONMENTALAND INFRASTRUCTURE, INC. NATURAL
' 789.16 = _ RESOURCES TECHNICAL REPORT (NRTR) DATED JUNE 2015.
_ 4. THE TOPOGRAPHY IS SHOWN FOR REFERENCE PURPOSES ONLYAND SHOULD
NOT BE USED FOR DESIGN OR ENGINEERING PURPOSES, TOPOGRAPHY PROVIDED
•'� _ - - BY TRANSASH.
5. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
6. ALL BOUNDARIES ARE APPROXIMATE.
�••: - t' fib# 7.AERIAL IMAGERY IS COMBINATION OF DUKE ENERGY PROPELLER AERIAL
1� CLF22-307 _ Q - _ - PHOTOGRAPHY COLLECTED ON OCTOBER 1, 2024, AND MAXAR SATELLITE IMAGERY
800.66 rt vq 6.,1� 1 i `. •f _' ` / OBTAINED FROM ESRI ONLINE COLLECTED ON AUGUST 23, 2021.
�.
8. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
♦ ` rT fr` %b
COORDINATE SYSTEM LIPS 3200 (NAD63),
bl
GRAPHIC SCALE
% DUKE 200 0 200 400 FIGURE 2
Y" ENERGY
AREA OF FOCUS WATER -LEVEL MAP
N FEEt)
UPPER FLOW ZONE
DRAWN BYT.KING
DATE:05/12/2022
GROUNDWATER CONDITIONS QUARTERLY REPORT
• - .4 _ __ ��
REVISED BY L. FOREMAN
CHECKED BY: T COLTON
DATE: 10/09/2024
DATE: 10/09/2024
JULY 2024 THROUGH SEPTEMBER 2024
APPROVED RY_T COLTON
DATE 10/09/2024
MARSHALL STEAM STATION
µ synTerra
PROJECTMANAGER' c COLTON
TERRELL, NORTH CAROLINA

ILF-02S/D
MW-04/D
846 -
844 -
842 -
840 -
838
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
ILF-02S - Total water level change from transducer installation on 07/30/2021 to 09/30/2024 is -1.5 feet.
ILF-02D - Total water level change from transducer installation on 07/30/2021 to 09/30/2024 is -1.0 feet.
ILF-02S/D
848
845
842
839
o
0
° o
0
�o
<000
o °
0 0°
0
0 0 0
0 o
O 0 0
O
O
kz- � O
O Op O
O �
O O p D��pO
O �
O � � ii i a
O'
836 4 " - I. ", T
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
4
we
c
834
O
00 832
O
Q
Z
c 830
O
.w
M
a
GJ
J 828
N
M
i
O Op O
� OO 00 O O
O
0 8
OO O' I
O
O
O
O
826 1nT 1-1101 U.i� TPunuh1 uT4111luuu1WuIIIJ,n�umiTii�.0 11PIIIIIAI ui�+uiuT01n
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /�2022 6/1 /2023 12/�1 /20�23 6/1 /2024
Date
MW-04 - Total water level change from transducer installation on 07/30/2021 to 09/30/2024 is -2.4 feet.
MW-04D - Total water level change from transducer installation on 07/30/2021 to 09/30/2024 is -3.1 feet.
MW-04/D
837
> 834
Q
Z
V O
� O
O
831
LU
v
>
d
� 828
OO4O
0 I
OO 0 O' p O � O O O O0, OOO Off.
VV O O QD <s> O
825 1 1 1 - 1. 1,TTTTT
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
U
4
c
2 X
Ini
LEGEND
Cell 5 construction start (05/31/2021)
Notes:
NAVD 88 —North American Vertical
DUKE
t
DRAWN BY: D. AVARD
DATE:07/21/2021
FIGURE 3A
Future Phases 3 through 5 CCR excavation start (06/18/2021)
Datum 1988
ENERGY,
REVISED BY: D. AVARD
DATE: 10/10/2024
UPGRADIENT OF PHASE 2 EXPANSION HYDROGRAPHS
Cell 5 Blanket Underdrain construction start (9/20/2021)
Ft Feet
CAR�LINAS
CHECKED BY: T. COLTON
DATE: 10/11/2024
INDUSTRIAL LANDFILL NO 1.1812-INDUS
( )
Cell 5 Blanket Underdrain construction completion (10/22/2021)
GROUNDWATER CONDITIONS QUARTERLY REPORT
'110PROJECT
Shallow Groundwater Flow Zone (Transducer Data) in - inches
APPROVED BY:T. COLTON
DATE: 10/11/2024
APRIL 2024 THROUGH JUNE 2024
Deep Groundwater Flow Zone (Transducer Data) ♦
Manual Water Level Measurement
MANAGER:T. COLTON
MARSHALL STEAM STATION
Bedrock Groundwater Flow Zone (Transducer Data)
Daily Total Rainfall (inches)
synTffm
TERRELL, NORTH CAROLINA
— — - Transient Groundwater Model Water Level Predicted Trend
www.synterracorp.com

GWA-04S/D
CLF21-10
842
852
6
6
O
1 850
•0
841
O
p•
00 �Op
••� O•
>
I
O O
4
>
1
O
4
Z
Z
00
O
I I
O 0 0
_
00
O
Op
S
"
c
c 848
p
Op 0000 000
II
c 840
�.
m
>
p O p. O O
o
>
c
W
O CA OHO
2
w
2
J 846
J 839
a�
v
a
M
844
0
838
0
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
6/1 /2021
12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
Date
GWA-04S - Total water level change from transducer installation on 07/30/2021 to 09/30/2024 is -3.9 feet.
CLF21-10 -Total water level change from transducer installation on 08/10/2021 to 09/30/2024 is -0.6 feet.
GWA-04D - Total water level change from transducer installation on 07/30/2021 to 09/30/2024 is -4.3 feet.
GWA-04S/D
CLF21-10
844
855
00
0
p 852
p
—
> 842
>
Z
• .0
0
O OO O O p1• �� 4�0 �O
849
O O�
> 840
O O
O p
" OQ OO• OO•
W
a)
W
�O O O O O OO O O O OOD
>
O O' O'
O O O p 0 GAO OHO q>*
>
846
838
-
3
843
836
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
6/1 /2021
12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
Date
LEGEND Notes:
Cell 5 construction start (05/31/2021) NAVD 88 -North American Vertical
DUKE
DRAWN BY: D. AVARD DATE:07/21/2021
FIGURE 313
Future Phases 3 through 5 CCR excavation start (06/18/2021)
Datum 1988
ENERGY,
REVISED BY: D. AVARD DATE: 10/10/2024
UPGRADIENT OF PHASE 2 EXPANSION HYDROGRAPHS
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft Feet
CAR�LINAS
CHECKED BY: T. COLTON DATE: 10/11/2024
INDUSTRIAL LANDFILL NO 1.1812-INDUS
( )
Cell 5 Blanket Underdrain construction completion (10/22/2021)
GROUNDWATER CONDITIONS QUARTERLY REPORT
Shallow Groundwater Flow Zone (Transducer Data) in - inches
APPROVED BY:T. COLTON DATE: 10/11/2024
APRIL 2024 THROUGH JUNE 2024
Deep Groundwater Flow Zone (Transducer Data) ♦ Manual Water Level Measurement
PROJECT MANAGER:T. COLTON
MARSHALL STEAM STATION
Bedrock Groundwater Flow Zone (Transducer Data) Daily Total Rainfall (inches)
synTem
TERRELL, NORTH CAROLINA
— — - Transient Groundwater Model Water Level Predicted Trend
www.synterracorp.com

CLF-LID
CLF21-11
830
817
6
6
0
O
00 815
00 828
O
Q
4
a
4
Z
Z
+.;
c
Y
�
c
826
�=
c 813
0
o
M
O00 O O
f6
W
I
^
M
2
a
W
�•
M
J 811
J 824
A
a�
E11111
v
M
M
809
0
822
0
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
6/1 /2021
12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
Date
CLF-UD — Water level is stable during underdrain operations. Water levels spikes represent when pump was temporarily out of service.
CLF21-11- Total water level change from transducer installation on 08/09/2021 to 09/30/2024 is -4.9 feet.
CLF-LID
CLF21-11
830
817
OD
p 828
00
p 815
—
Q
a
Z
�
Z
I
LL
826
813
v
W
O p O�
a)
W
v 824
>
\
+
\
811
°1
3 822
M
3
809
820
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
6/1 /2021
12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
Date
LEGEND Notes:
fai� DUKE
DRAWN BY: D.AVARD DATE:07/21/2021
FIGURE 3C
Cell 5 construction start (05/31/2021) NAVD 88 — North American Vertical
.� ENERGY.
REVISED BY: D. AVARD DATE: 10/10/2024
WITHIN PHASE 2 EXPANSION HYDROGRAPHS
Future phases 3 through 5 CCR excavation start (06/18/2021) Datum 1988
CARC)LINAS
INDUSTRIAL LANDFILL NO 1. (1812-INDUS)
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft -Feet
CHECKED BY: T. COLTON DATE: 10/11/2024
GROUNDWATER CONDITIONS QUARTERLY REPORT
`�
Cell 5 Blanket Underdrain construction completion (10/22/2021)
in -inches
APPROVED BY: T. COLTON DATE: 10/11/2024
APRIL 2024 THROUGH DUNE 2024
Shallow Groundwater Flow Zone ( Transducer Data)
♦ Manual Water Level Measurement
PROJECT MANAGER:T.COLTON
MARSHALL STEAM STATION
— — -Transient Groundwater Model water level predicted trend
Daily Total Rainfall (inches)
synTerra
TERRELL, NORTH CAROLINA
www.synterracorp.com

824
O�
00 822
0
Q
z
+s
820
c
>
al
W
Gl
ai 818
I.
fC
d
i
00
0
a
z
4j
c
2
M
>
GI
W
N
>
Gl
J
a1
+r
M
CLF21-12
0 00
I
0 0 00
0 0 0
816 1I IaL1PR I12 0 U. ITPINull l _ IIL. 1 .1 ,R1.9J, 11 oil YII W J1,ills n111 I IPLIYi �L. 11 11 p w 1w11_L-IT
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/11/2024
Date
CLF21-12 - Total water level change from transducer installation on 08/09/2021 to 09/30/2024 is -2.6 feet.
CLF21-12
825
of
820
815
810
,00aaa�oo �m
805 114 ' i I iTTICI
6/1/2021 12/1/2021 6/1/2022 12/1/2022 6/1/2023 12/1/2023 6/1/2024
Date
0
4
0
c
00
00
0
Q
z
c
O
M
a
W
N
>
J
L
M
i
CLF21-13/R
821 6
p• CLF21-13 was abandoned and replaced on
November 4, 2021.
O .d 0
Re
818
O O
OD p 4
�O O
O �
815
w
O 2
812
809 IT IaLl Yi ll■ .I. II III 11Y1Ip.1 IlL.I .1 qzI.A-II 110111 IIWII _I II11111111�LIYi L1111 11 LLYII LitrILI11J11■ 1EFL1■
6/1/2021 12/1/2021 6/1/2022 12/1/2022 6/1/2023 12/1/2023 6/1/2024
Date
CLF21-13R - Total water level change from transducer installation on 11/08/2021 to 09/30/2024 is -6.4 feet.
CLF21-13 - Total water level change from transducer installation on 08/09/2021 to 10/01/2021 is -0.2 feet.
CLF21-13/R
823
818 -
[.3s;
803 -
798
6/1/2021 12/1/2021 6/1/2022 12/1/2022 6/1/2023 12/1/2023 6/1/2024
Date
.
� O OO OO
OO
OO O O O
\ o 0 00
�. BOO
LEGEND
Notes:
DRAWN BY: D.AVARD
DATE:07/21/2021
FIGURE3D
Cell 5 construction start (05/31/2021)
NAVD 88 — North American Vertical
'DUKE
.� ENERGY.
REVISED BY: D. AVARD
DATE: 10/10/2024
WITHIN PHASE 2 EXPANSION HYDROGRAPHS
Future phases 3 through 5 CCR excavation start (06/18/2021)
Datum 1988
CARC)LINAS
INDUSTRIAL LANDFILL NO 1. (1812-INDUS)
Cell 5 Blanket Underdrain construction start (9/20/2021)
Ft -Feet
CHECKED BY: T. COLTON
DATE: 10/11/2024
GROUNDWATER CONDITIONS QUARTERLY REPORT
`�
Cell 5 Blanket Underdrain construction completion (10/22/2021)
in -inches
APPROVED BY: T. COLTON
DATE: 10/11/2024
APRIL 2024 THROUGH DUNE 2024
Shallow Groundwater Flow Zone ( Transducer Data)
♦
Manual Water Level Measurement
PROJECT MANAGER:T.COLTON
MARSHALL STEAM STATION
— — -Transient Groundwater Model water level predicted trend
Daily Total Rainfall (inches)
synTerra
TERRELL, NORTH CAROLINA
www.synterracorp.com

CLF21-14/R
CLF21-15
822
821
00
00
0
Q
Z 820
c
O
> 819
W
817
6
4
c
2 °C
0
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/11/2024
Date
CLF21-14R - Total water level change from transducer installation on 04/08/2022 to 09/30/2024 is +0.7 feet.
...... • CLF21-14 - Total water level change from transducer installation on 08/13/2021 to 03/22/2022 is -3.3 feet.
CLF21-14/R
E:304:3
824 -
820 -
816 -
812
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/11/2024
Date
a
_
OT
0'
827
O
O
_
00 825
00
17
Q
Z
c 823
M
W
w
N
a>i 821
v
M
.1
N
O 4
The CLF21-15 transducer O
O was removed in April 2023 O ^
O and replaced in July 2023
2
�11Alii ll�l Y.I. 1111111Y11111. I10_ 1 .1 ■I,a_I II YIN 1poliq II Ills 11 inn 1p LIii P1111 11 11 p- 1-1-111_111■ 1�11■
819 T—�—r--�� �T��T�T� 0
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/11/2024
Date
CLF21-15 - Total water level change from transducer installation on 08/13/2021 to 09/30/2024 is -3.1 feet.
Total water level change from transducer installation on 07/31/2023 to 12/31/2023 is -0.9 feet.
CLF21-15
828
a0
825
822
819
O O
O O 40 ***
816 I11' i 1i ' ,i T T T T T
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/11/2024
Date
LEGEND
Notes:
fai� DUKE
DRAWN BY: D.AVARD
DATE:07/21/2021
FIGURE 3E
Cell 5 construction start (05/31/2021)
NAVD 88 — North American Vertical
.� ENERGY.
REVISED BY: D. AVARD
DATE: 10/10/2024
WITHIN PHASE 2 EXPANSION HYDROGRAPHS
Future phases 3 through 5 CCR excavation start (06/18/2021)
Datum 1988
CAR�LINAS
INDUSTRIAL LANDFILL NO 1. (1812-INDUS)
Cell 5 Blanket Underdrain construction start (9/20/2021)
Ft -Feet
CHECKED BY: T. COLTON
DATE: 10/11/2024
GROUNDWATER CONDITIONS QUARTERLY REPORT
`�
Cell 5 Blanket Underdrain construction completion (10/22/2021)
in -inches
APPROVED BY: T. COLTON
DATE: 10/11/2024
APRIL 2024 THROUGH DUNE 2024
Shallow Groundwater Flow Zone ( Transducer Data)
♦
Manual Water Level Measurement
PROJECT MANAGER:T.COLTON
MARSHALL STEAM STATION
— — -Transient Groundwater Model water level predicted trend
Daily Total Rainfall (inches)
synTerra
TERRELL, NORTH CAROLINA
www.synterracorp.com

CLF-401
CLF-402
819
[*M
C
0
> 807
W
a�
>
a�
803
M
�O O
0' IO�
� I O
6
4
C
2 1=
799 11111111,1140112A u.i,—'.11111 WouW-III r 1 -1421,11, 1! 11111111piniqu ills &W 11 .1TWI-4u_n�■T 0
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
CLF-401- Total water level change from transducer installation on 07/27/2021 to 09/30/2024 is -14.4 feet.
CLF-401
819
00 814
00
0
Q
Z
LL 809
r-
0
°J 804
W
N
>
Gl
J
L
799
ca
O
794 4 1 i - I I Ti Ti I I 1 1
6/1/2021 12/1/2021 6/1/2022 12/1/2022 6/1/2023 12/1/2023 6/1/2024
Date
813
810
807
801
798
795
6
4
C
2 OC
0
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
CLF-402 - Total water level change from transducer installation on 07/27/2021 to 09/30/2024 is -15.5 feet.
CLF-402
815 -
810 -
[.*G=
M*1072
790
6/1/2021 12/1/2021 6/1/2022 12/1/2022 6/1/2023 12/1/2023 6/1/2024
Date
•�I
ILL
4>
00 O
O
O
0
00
O�
O
O <ft>
LEGEND
Notes:
fai,,DUKE
DRAWN BY: D.AVARD
DATE:07/21/2021
FIGURE3F
Cell 5 construction start (05/31/2021)
NAVD 88 — North American Vertical
ENERGY
REVISED BY: D. AVARD
DATE: 10/10/2024
DOWNGRADIENT OF THE PHASE 2 EXPANSION
Future phases 3 through 5 CCR excavation start (06/18/2021)
Datum 1988
CAR�LINAS
INDUSTRIAL LANDFILL NO 1. (1812-INDUS)
Cell 5 Blanket Underdrain construction start (9/20/2021)
Ft -Feet
CHECKED BY: T. COLTON
DATE: 10/11/2024
GROUNDWATER CONDITIONS QUARTERLY REPORT
`�
Cell 5 Blanket Underdrain construction completion (10/22/2021)
in -inches
APPROVED BY: T. COLTON
DATE: 10/11/2024
APRIL 2024 THROUGH DUNE 2024
Shallow Groundwater Flow Zone ( Transducer Data)
♦
Manual Water Level Measurement
PROJECT MANAGER:T.COLTON
MARSHALL STEAM STATION
— — -Transient Groundwater Model water level predicted trend
Daily Total Rainfall (inches)
synTerra
TERRELL, NORTH CAROLINA
www.synterracorp.com

CLF22-306
CLF22-307
806
6
804
6
O
800
800 —
0
00
00
Q
4
a
4
Z
796
Z
794
o
—
o
>
792
>
788
w
2
w
2
Gl
N
I
N
J
N
J
788
782
fC
f6
784
0
776
0
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
Date
CLF22-306 - Total water level change from transducer installation on 08/13/2021 to 06/26/2024
is -12.2 feet.
CLF22-307 - Total water level change from transducer installation on 04/08/2022 to 06/26/2024 is -14.9 feet.
CLF22-306R - Total water level change from transducer installation on 07/11/2024 to 09/03/2024 is -1.4 feet.
CLF22-307R - Total water level change from transducer installation on 07/11/2024 to 09/30/2024 is +0.5 feet.
CLF22-306
CLF22-307
808
811
803
00 O
00 p
804
CLF22-307 was not
Q
I
00 O
Z
used in the
Transient
Z
LL
Groundwater
LL
798
797
Model calibration,
water level
C
I
predictions were
o
v
prepared
a>i
793
"'
790
following
W
>
installation of
>
CLF22-307 (after
J
d
Transient
)
41
788
o
?�
783
Groundwater
M
Model calibration)
783
776
—
6/1/2021
12/1/2021 6/1/2022 12/1/20Date 6/1/2023 12/1/2023 6/1/2024
6/1/2021
12/1/2021 6/1/2022 12/1/2D0 6/1/2023 12/1/2023 6/1/2024
to
CLF22-306 was
not used in the Transient Groundwater Model calibration, water level predictions were prepared following
installation of
The predicted increase of
modeled water levels is based upon the expected shutdown of the Cell 5 underdrain pumping operation.
The slower basin
CLF22-306 (after
Transient Groundwater Model calibration)
excavation rate
has extended the period needed to operate the underdrain and will delay the shutdown of the Cell 5 underdrain.
LEGEND Notes:
The modeled water levels are truncated
fft" DUKE
DRAWN BY: D. AVARD DATE:07/21/2021
FIGURE 3G
Cell 5 construction start (05/31/2021) NAVD 88 — North American Vertical
based upon the expected shutdown of
<.. ENERGY::
DOWNGRADIENT OF THE PHASE 2 EXPANSION
Future phases 3 through 5 CCR excavation start (06/18/2021) Datum 1988
the Cell 5 underdrain pumping
CAROLINAS
REVISED BY: D. AVARD DATE: 10/10/2024
INDUSTRIAL LANDFILL NO 1. (1812-INDUS)
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft -Feet
operation. The slower basin excavation
p
CHECKED BY: T. COLTON DATE: 10/11/2024
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) rate has extended the period needed to
in -inches
APPROVED BY: T. COLTON DATE: 10/11/2024
APRIL 2024 THROUGH DUNE 2024
— — -
Shallow Groundwater Flow Zone Transducer Data
( ) Manual Water Level Measurement
operate the underdrain and will delay
�
PROJECT MANAGER:T. COLTON
MARSHALL STEAM STATION
Transient Groundwater Model water level predicted trend
Daily Total Rainfall (inches)
the shutdown of the Cell 5 underdrain
Terra
TERRELL, NORTH CAROLINA
www.synterracorp.com
O

CLF22-405
CLF23-406
806
6
808
6
O
802 - k
00
00
804
0
0
Q
4
a
4
Z
798
Z
+.;
c
Y
�
c
800
-_
o —
o
—
M
>
794
>
>
v
w
M
2 oC
a
,�,
I
ra
2 oC
ai
ai
a�
a>i
796
790
M
M
0
792
1W786
0
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
Date
CLF23-405 - Total water level change from transducer installation on 03/01/2023 to 09/30/2024 is -14.9 feet.
CLF23-406 - Total water level change from transducer installation on 03/01/2023 to 09/30/2024 is -12.6 feet.
CLF22-405
CLF23-406
812
818
00
0
804
\ p
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810
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0
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796
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802
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788
794
p0
I
3
\
780
786
6/1/2021
12/1/2021 6/1/2022 12/1/20Date 6/1/2023 12/1/2023 6/1/2024
6/1/2021
12/1/2021 6/1/2022 12/1/2D0 6/1/2023
12/1/2023 6/1/2024
to
The predicted increase
of modeled water levels is based upon the expected shutdown of the Cell 5 underdrain pumping operation.
The slower
The predicted increase of
modeled water levels is based upon the expected shutdown of the Cell 5 underdrain pumping operation.
The slower basin
basin
excavation
rate has extended the period needed to operate the underdrain and will delay the shutdown of the Cell
5 underdrain.
excavation
rate
has extended the period needed to operate the underdrain and will
delay the shutdown of the Cell 5
underdrain.
LEGEND Notes:
The modeled water levels are truncated
�� DUKE
DRAWN BY: D. AVARD DATE:07/21/2021
FIGURE 3H
Cell 5 construction start (05/31/2021) NAVD 88 - North American Vertical
based upon the expected shutdown of
"
<.. ENERGY::
DOWNGRADIENT OF THE PHASE 2 EXPANSION
Future phases 3 through 5 CCR excavation start (06/18/2021) Datum 1988
the Cell 5 underdrain pumping
CAROLINAS
REVISED BY: D. AVARD DATE: 10/10/2024
INDUSTRIAL LANDFILL NO 1. (1812-INDUS)
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft -Feet
operation. The slower basin excavation
p
CHECKED BY: T. COLTON DATE: 10/11/2024
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) rate has extended the period needed to
in -inches
APPROVED BY: T. COLTON DATE: 10/11/2024
APRIL 2024 THROUGH JUNE 2024
— — -
Shallow Groundwater Flow Zone Transducer Data
( ) Manual Water Level Measurement
operate the underdrain and will delay
�
PROJECT MANAGER:T. COLTON
MARSHALL STEAM STATION
Transient Groundwater Model water level predicted trend
Daily Total Rainfall (inches)
the shutdown of the Cell 5 underdrain
Terra
TERRELL, NORTH CAROLINA
www.synterracorp.com

CLF23-407
CLF23-408
811
6
806
6
802
1
808
400
>
4
>
4
Z
?
798
4
c
805
O
-
o
v
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41
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M
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A
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794
w
I
2
w
2 OC
W
802
L
L
790
M
M
41k
J�
799
0
786
Aill
13A
0
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
Date
CLF23-407 - Total water level change from transducer installation on 03/01/2023 to 09/30/2024 is -9.0 feet.
CLF23-408 - Total water level change from transducer installation on 03/21/2023 to 09/30/2024 is -12.7 feet.
CLF23-407
CLF23-408
818
812
0o
p
805
p
>
812
>
Z
N
Z
4
...
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798
44
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791
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4
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v
ai
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L
M
I
3
784
7944
777
6/1/2021
12/1/2021 6/1/2022 12/1/20Date 6/1/2023 12/1/2023 6/1/2024
6/1/2021 12/1/2021 6/1/2022 12/1/2D0 6/1/2023
12/1/2023 6/1/2024
to
The predicted increase
of modeled water levels is based upon the expected shutdown of the Cell 5 underdrain pumping operation. The slower
The predicted increase of modeled water levels is based upon the expected shutdown of the Cell 5 underdrain pumping operation. The slower basin
basin excavation
rate has extended the period needed to operate the underdrain and will delay the shutdown of the Cell 5 underdrain.
excavation rate has extended the period needed to operate the underdrain and will delay the shutdown of the Cell 5 underdrain.
LEGEND Notes:
The modeled water levels are truncated
�� DUKE
DRAWN BY: D. AVARD DATE:07/21/2021
FIGURE 31
Cell 5 construction start (05/31/2021) NAVD 88 — North American Vertical
based upon the expected shutdown of
"
<.. ENERGY::
DOWNGRADIENT OF THE PHASE 2 EXPANSION
Future phases 3 through 5 CCR excavation start (06/18/2021) Datum 1988
the Cell 5 underdrain pumping
CAROLINAS
REVISED BY: D. AVARD DATE: 10/10/2024
INDUSTRIAL LANDFILL NO 1. (1812-INDUS)
Cell 5 Blanket Underdrain construction start (9/20/2021) Ft -Feet
operation. The slower basin excavation
p
CHECKED BY: T. COLTON DATE: 10/11/2024
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) rate has extended the period needed to
in -inches
APPROVED BY: T. COLTON DATE: 10/11/2024
APRIL 2024 THROUGH DUNE 2024
— — -
Shallow Groundwater Flow Zone Transducer Data
( ) Manual Water Level Measurement
operate the underdrain and will delay
�
PROJECT MANAGER:T. COLTON
MARSHALL STEAM STATION
Transient Groundwater Model water level predicted trend
Daily Total Rainfall (inches)
the shutdown of the Cell 5 underdrain
Terra
TERRELL, NORTH CAROLINA
www.synterracorp.com

CLF24-505
6
830
00 829
>
4
z
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c
c 828
=
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m
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aa)
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_
a1
ar 827
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M
826
0
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
CLF24-505 - Total water level change from transducer installation on 09/03/2023 to 10/07/2024 is -0.8 feet.
CLF24-505
832
0 830
Q
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Not Used
W
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ar
a
824
6/1/2021
12/1/2021 6/1/2022 12/1/2022 6/1/2023 12/1/2023 6/1/2024
Date
The predicted increase
of modeled water levels is based upon the expected shutdown of the Cell 5 underdrain pumping operation.
The slower
basin excavation
rate has extended the period needed to operate the underdrain and will delay the shutdown of the Cell
5 underdrain.
LEGEND Notes: The modeled water levels are truncated
( DU
DUKE
DRAWN BY: D. AVARD DATE: 10/10/2024
FIGURE 3 J
Cell 5 construction start (05/31/2021) NAVD 88 — North American Vertical based upon the expected shutdown of
\ ENERGY.,
WEST OF THE PHASE 2 EXPANSION
Future phases 3 through 5 CCR excavation start (06/18/2021) Datum 1988 the
Cell 5 underdrain pumping
CAROLINAS
REVISED BY: D. AVARD DATE: 10/10/2024
INDUSTRIAL LANDFILL NO 1. (1812-INDUS)
Cell 5 Blanket Underdrain construction start (9/20/2021) operation. The slower basin excavation
Ft -Feet p
CHECKED BY: T. COLTON DATE: 10/11/2024
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) rate has extended the period needed to
in -inches
APPROVED BY: T. COLTON DATE: 10/11/2024
APRIL 2024 THROUGH DUNE 2024
Shallow Groundwater Flow Zone Transducer Data
( ) Manual Water Level Measurement operate the underdrain and will delay
— — -
�
PROJECT MANAGER:T. COLTON
MARSHALL STEAM STATION
Transient Groundwater Model water level predicted trend the
Daily Total Rainfall (inches)
shutdown of the Cell 5 underdrain
Terra
TERRELL, NORTH CAROLINA
www.synterracorp.com

CLF24-501
CLF24-502
796
794
6
6
00793
00 795
0
0
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4
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6/1/2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
6/1/2021
12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
Date
Date
CLF24-501- Total water level change from transducer installation on 09/03/2023 to 10/07/2024 is +0.4 feet.
CLF24-502
- Total water level change from transducer installation on 09/03/2023 to 10/07/2024 is +1.1 feet.
CLF24-501
CLF24-502
796
798
00
0
0 794
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792
fa
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3
7884
790
6/1/2021
12/1/2021 6/1/2022 12/1/20 2 6/1/2023 12/1/2023 6/1/2024
6/1/2021
12/1/2021 6/1/2022 12/1/ 6/1/2023 12/1/2023 6/1/2024
Date
ate
The predicted increase
of modeled water levels is based upon the expected shutdown of the Cell 5 underdrain pumping operation. The slower
The predicted increase of
modeled water levels is based upon the expected shutdown of the Cell 5 underdrain pumping operation. The slower basin
basin excavation
rate has extended the period needed to operate the underdrain and will delay the shutdown of the Cell 5 underdrain.
excavation rate
has extended the period needed to operate the underdrain and will delay the shutdown of the Cell 5 underdrain.
LEGEND Notes: The modeled water levels are truncated
DUKE
DRAWN BY: D. AVARD DATE: 10/10/2024
FIGURE 3K
Cell 5 construction start (05/31/2021) NAVD 88 — North American Vertical based upon the expected shutdown of
"
<.. ENERGY::
SOUTHWEST OF THE FUTURE PHASE 5 EXPANSION
Future phases 3 through 5 CCR excavation start (06/18/2021) Datum 1988 the Cell 5 underdrain pumping
CAROLINAS
REVISED BY: D. AVARD DATE: 10/10/2024
INDUSTRIAL LANDFILL NO 1. (1812-INDUS)
Cell 5 Blanket Underdrain construction start (9/20/2021) operation. The slower basin excavation
Ft -Feet p
CHECKED BY: T. COLTON DATE: 10/11/2024
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) rate has extended the period needed to
in -inches
APPROVED BY: T. COLTON DATE: 10/11/2024
APRIL 2024 THROUGH DUNE 2024
Shallow Groundwater Flow Zone Transducer Data
( ) Manual Water Level Measurement operate the underdrain and will delay
— — -
�
PROJECT MANAGER:T. COLTON
MARSHALL STEAM STATION
Transient Groundwater Model water level predicted trend the shutdown of the Cell 5 underdrain
Daily Total Rainfall (inches)
Terra
TERRELL, NORTH CAROLINA
www.synterracorp.com

CLF24-503
CLF24-504
6
814
6
798
1
797
813
—
Q
4
a
4
Z
Z
+.;
Y
c
796
=-
c
812
—
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o
—
o
—
m
>
M
>
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M
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w
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w
I
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795
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811
J
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M
UL4
iij
A
L
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794
j
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0
810
lia
0
AL
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023 12/1 /2023 6/1 /2024
6/1 /2021 12/1 /2021 6/1 /2022 12/1 /2022 6/1 /2023
12/1 /2023 6/1 /2024
Date
Date
CLF24-503 - Total water level change from transducer installation on 09/03/2023 to 10/07/2024 is -0.1 feet.
CLF24-504 - Total water level change from transducer installation on 09/03/2023 to 10/07/2024 is -0.7 feet.
CLF24-503
CLF24-504
800
816
00
0
0
798
Q
814
a
Z
Z
*'
o
41
796
>
812
—
>
W
W
;
GJ
>
al
J
794
L
810
fa
3
3
7924
808
6/1/2021
12/1/2021 6/1/2022 12/1/20 2 6/1/2023
12/1/2023 6/1/2024
6/1/2021
12/1/2021 6/1/2022 12/1/ 6/1/2023
12/1/2023 6/1/2024
Date
ate
LEGEND
Notes: The modeled water levels are truncated
( DUKE
DRAWN BY: D. AVARD DATE: 10/10/2024
FIGURE 3L
Cell 5 construction start (05/31/2021)
NAVD 88 - North American Vertical based upon the expected shutdown of
\ ENERGY.,
WEST OF THE FUTURE PHASE 5 EXPANSION
Future phases 3 through 5 CCR excavation start (06/18/2021)
Datum 1988 the
Cell 5 underdrain pumping
CAROLINAS
REVISED BY: D.AVARD DATE: 10/10/2024
INDUSTRIAL LANDFILL NO 1. (1812-INDUS)
Cell 5 Blanket Underdrain construction start (9/20/2021)
operation. The slower basin excavation
Ft -Feet p
CHECKED BY: T. COLTON DATE: 10/11/2024
GROUNDWATER CONDITIONS QUARTERLY REPORT
Cell 5 Blanket Underdrain construction completion (10/22/2021) rate has extended the period needed to
in -inches
APPROVED BY: T. COLTON DATE: 10/11/2024
APRIL 2024 THROUGH DUNE 2024
— — -
Shallow Groundwater Flow Zone Transducer Data
( ) Manual Water Level Measurement operate the underdrain and will delay
�
PROJECT MANAGER: T. COLTON
MARSHALL STEAM STATION
Transient Groundwater Model water level predicted trend
the
Daily Total Rainfall (inches)
shutdown of the Cell 5 underdrain
synTem
TERRELL, NORTH CAROLINA
www. sy me rra co r p. co m

140
120
M
MN
20
1.1
0
2
V)
v
U
O
M
�U
v
0
-0
9/1/2021 3/1/2022
9/1/2022 3/1/2023
9/1/2023 3/1/2024 9/1/2024
Years of Operation
(date)
Notes:
1. gpm = gallons per minute.
2. Flow data from the first day following a period of no flow were not
plotted.
DUKE
DRAWN BY: T. COLTON
DATE: 10/13/2021
FIGURE 4
ENERGY
CARai
REVISED BY: D. AVARD
CHECKED BY: T.COLTON
DATE: 10/14/2024
DATE:10/15/2024
CELL 5 (UNDERDRAIN)
PUMPING FLOW RATE VS. SIMULATED FLOW RATE
APPROVED BY: T. COLTON
DATE: 10/15/2024
GROUNDWATER CONDITIONS QUARTERLY REPORT
0
PROJECT MANAGER: T. COLTON
JULY 2024 THROUGH SEPTEMBER 2024
MARSHALL STEAM STATION
synTerrra
www.synterracorp.com
F
TERRELL, NORTH CAROLINA

Groundwater Conditions Quarterly Report —July 2024 to September 2024
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
TABLE
41P
synTerra
Science & Engineering Consultants

TABLE 1
GROUNDWATER MONITORING NETWORK WELL INFORMATION AND WATER LEVELS
GROUNDWATER CONDITIONS QUARTERLY REPORT
JULY 2024 THROUGH SEPTEMBER 2024
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Well ID
Date Well/
Piez
Insttalledalled
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
2,3
Depth
(Ft-BGS)
Measured
t
Well Depth
(Ft-TOC)
Screened
Interval 3
(Ft-TOC)
Top of
Screen
Elevation
(Ft-NAVD 88)
Bottom
of Screen
Elevation
(Ft-NAVD 88)
Water Level
Measurement
(Ft-TOC)
06/24/2024
Groundwater
Elevation
(Ft-NAVD 88)
06/24/2024
Water Level
Measurement
(Ft-TOC)
08/16/2024
Groundwater
Elevation
(Ft-NAVD 88)
08/16/2024
Water Level
Measurement
(Ft-TOC)
09/03/2024
Groundwater
Elevation
(Ft-NAVD 88)
09/03/2024
Water Level
Measurement
(Ft-TOC)
10/07/2024
Groundwater
Elevation
(Ft-NAVD 88)
10/07/2024
CLF-401
5/17/2021
7/27/2021
Shallow
685783.50
1412779.50
832.44
830.44
39.00
41.00
29.00
39.00
803.44
793.44
30.01
802.43
30.95
801.49
31.21
801.23
31.42
801.02
CLF-402
5/21/2021
7/27/2021
Shallow
685598.80
1413217.80
818.41
816.41
50.00
52.00
40.00
50.00
778.41
768.41
20.33
798.08
21.70
796.71
21.94
796.47
21.87
796.54
CLF21-10
8/6/2021
8/6/2021
Shallow
687020.10
1412353.40
857.75
857.75
32.00
32.00
22.00
32.00
835.75
825.75
17.42
840.33
17.32
840.43
17.44
840.31
17.22
840.53
CLF21-11
8/5/2021
8/5/2021
Shallow
686572.30
1412572.20
850.17
850.08
40.00
41.64
31.64
41.64
818.53
808.53
24.73
825.44
24.80
825.37
24.85
825.32
24.67
825.50
CLF21-12
8/5/2021
8/5/2021
Shallow
686217.40
1412518.20
839.06
838.96
40.00
43.22
31.22
41.22
807.84
797.84
19.32
819.74
19.43
819.63
19.48
819.58
19.19
819.87
CLF21-13R
11/4/2021
11/8/2021
Shallow
686085.92
1412818.66
836.21
836.2
35.00
37.46
25.46
35.46
810.75
800.75
22.49
813.72
22.76
813.45
22.79
813.42
22.76
813.45
CLF21-14R
4/18/2022
4/18/2022
Shallow
686027.10
1414268.70
847.54
844.0
41.50
38.19
28.19
38.19
819.35
809.35
28.57
818.97
28.70
818.84
28.79
818.75
28.23
819.31
CLF21-15
8/10/2021
8/10/2021
Shallow
686307.70
1414410.00
864.37
864.37
55.00
55.00
45.00
55.00
819.37
809.37
40.86
823.51
41.08
823.29
41.20
823.17
41.10
823.27
CLF22-306
3/22/2022
4/8/2022
Shallow
685033.00
1413752.34
816.36
813.57
25.00
25.00
15.00
25.00
801.36
791.36
26.72
789.64
28.48
787.88
28.58
787.78
NM
NM
CLF22-307
3/22/2022
4/8/2022
Shallow
684539.89
1413247.50
825.96
823.40
40.00
40.00
30.00
40.00
795.96
785.96
37.53
788.43
25.29
800.67
25.40
800.56
25.30
800.66
CLF23-405
2/14/2022
3/1/2022
Shallow
684920.61
1413022.90
810.29
807.29
42.00
42.00
32.00
42.00
778.29
768.29
18.74
791.55
21.10
789.19
21.22
789.07
21.13
789.16
CLF23-406
2/14/2022
3/1/2022
Shallow
685463.34
1412717.51
813.96
810.77
43.00
43.00
33.00
43.00
780.96
770.96
19.41
794.55
20.17
793.79
20.67
793.29
19.78
794.18
CLF23-407
2/15/2023
3/1/2022
Shallow
685796.44
1413229.69
828.87
826.33
43.00
43.00
33.00
43.00
795.87
785.87
27.41
801.46
28.33
800.54
28.58
800.29
28.83
800.04
CLF23-408
2/15/2023
3/1/2022
Shallow
685262.35
1413270.88
810.81
808.07
35.00
35.00
25.00
35.00
785.81
775.81
19.64
791.17
20.39
790.42
20.76
790.05
20.34
790.47
CLF24-501
8/16/2024
9/3/2024
Shallow
685106.80
1412762.60
807.30
804.10
30.00
30.00
20.00
30.00
787.30
777.30
Not Installed
15.64
791.66
14.35
792.95
CLF24-502
8/16/2024
9/4/2024
Shallow
685104.50
1412572.20
806.50
803.10
25.00
25.00
15.00
25.00
791.50
781.50
Not Installed
13.61
792.89
11.74
794.76
CLF24-503
8/15/2024
9/5/2024
Shallow
685371.10
1412442.40
815.00
812.30
55.00
55.00
45.00
55.00
770.00
760.00
Not Installed
18.89
796.11
18.55
796.45
CLF24-504
8/13/2024
9/6/2024
Shallow
685599.00
1412287.10
834.40
831.40
54.00
54.00
44.00
54.00
790.40
780.40
Not Installed
22.89
811.51
22.19
812.21
CLF24-505
8/14/2024
9/7/2024
Shallow
686132.70
1412145.50
856.20
853.60
55.00
55.00
45.00
55.00
811.20
801.20
Not Installed
27.84
828.36
27.60
828.60
GWA-4D
6/12/2015
7/30/2021
Deep
686783.39
1411776.91
902.45
899.38
90.07
93.14
84.07
89.07
818.38
813.38
54.83
847.62
54.90
847.55
54.85
847.60
54.65
847.80
GWA-4S
5/19/2015
7/30/2021
Shallow
686776.57
1411777.34
901.97
898.98
67.99
70.98
52.19
67.19
849.78
834.78
55.13
846.84
55.16
846.81
55.12
846.85
54.92
847.05
MW-4
6/30/1989
7/30/2021
Shallow
686723.00
1414467.00
867.15
863.81
50.20
49.93
49.93
49.93
823.55
813.55
37.90
829.25
37.84
829.31
37.52
829.63
37.63
829.52
MW 4D
10/12/2006
7/30/2021
Bedrock
686715.00
1414462.00
866.74
863.42
64.18
67.55
56.65
61.65
807.87
802.87
38.31
828.43
38.22
828.52
38.08
828.66
38.02
828.72
ILF-2D
3/31/2019
7/30/2021
Deep
687699.24
1413205.78
885.14
885.57
107.00
106.57
91.57
101.57
793.57
783.57
41.80
843.34
41.90
843.24
41.95
843.19
41.70
843.44
ILF-2S
3/31/2019
7/30/2021
Shallow
687699.26
1413214.68
884.79
1 885.21
1 52.00
1 51.58
41.58
51.58
843.21
833.21
1 44.44
1 840.35
1 44.52
1 840.27
1 44.62
1 840.17
1 44.49
840.30
Notes
1 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
Ft - Feet
NAD 83 - North American Datum of 1983
NAVD 88 - North American Vertical Datum of 1988
TOC - Top of casing
Prepared by: GTC Checked by: TWL
Page 1 of 1

Groundwater Conditions Quarterly Report — July 2024 to September 2024
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)
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Groundwater Conditions Quarterly Report — July 2024 to September 2024
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)
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Groundwater Conditions Quarterly Report — July 2024 to September 2024
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
APPENDIX C
UNDERDRAIN PUMPING DATA FILES
INCLUDED AS EXCEL FILE)
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Groundwater Conditions Quarterly Report — July 2024 to September 2024
Duke Energy Carolinas, LLC - Marshall Steam Station - Industrial Landfill No. 1
Terrell, North Carolina
APPENDIX D
MANN-KENDALL DATA
INCLUDED AS EXCEL FILE)
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