NC0004987_02_MSS_CAP Update 2019_Figures_20191231

Corrective Action Plan Update December 2019
Marshall Steam Station
FIGURES
(CAP Content Section 10)
SynTerra

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�LANDFILL#1
ILFSTRUCTURAL
FILL
MARSHALL STEAM STATION
PARCEL LINE
PV STRUCTURAL
FILL —fir
- a
� ASH BASIN?
i
ACCESS
ROSRAL FILL
-LANDFILL COMPLIANCE
BOUNDARY
FGD RESIDUE �.
LANDFILL BOUNDARY o
., o
YIA`HOLDIN�G BASIN ;,.S�A: �i • , �/� ��
GYP UM Ccuc
OALPILI
PAD
ral
SOURCE:
2016 USGS TOPOGRAPHIC MAP, TROUTMAN & LAKE NORMAN
NORTH QUADRANGLE, OBTAINED FROM THE USGS
STORE AT https://store.usgs.gov/map-locator.
DUKE CATAWBA
ENERGY® COUNTY
CAROLINAS
ASHEVIEEE
s)mTerra WWW.synterri
w
LANDFILL COMPLIANCE
BOUNDARY
LC&D LANDFILL
r7 P
DRY ASH LANDFILL
(PHASE II)
ASH BASIN COMPLIANCE.."'—
d BOUNDARY
O ASH BASIN
a WASTE BOUNDARY
LANDFILL COMPLIANCE--flf
1BOUNDARY
J BORROW AREA
y \
DRY ASH LANDFILL D
r t (PHASE 1)
ASH BASIN
STATION
D 0
0
FIGURE ES-1
USGS LOCATION MAP
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
DRAWN BY: B.YOUNG DATE: 05/15/2019 GRAPHIC SCALE
REVISED BY: B. YOUNG DATE: 12/10/2019 1,000 0 1,000 2,000
CHECKED BY: E. WEBSTER DATE: 12/10/2019
--------
APPROVED BY: B. WILKER DATE: 12/10/2019
PROJECT MANAGER: B. WILKER (IN FEET)

1
- �` QO�N4 �O♦
® .a
NOTES:
1. THE WATERS OF THE US DELINEATION HAS NOT BEEN
APPROVED BY THE US ARMY CORPS OF ENGINEERS AT THE TIME
OF THE MAP CREATION. THIS MAP IS NOT TO BE USED FOR
JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS
AND STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND
WETLAND DELINEATION CONDUCTED BY MCKIM & CREED MARCH
2016.
2. ALL BOUNDARIES ARE APPROXIMATE
3. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY
CAROLINAS.
4. AERIAL PHOTOGRAPHY OBTAINED FROM GOGGLE EARTH PRO
ON JULY 26, 2018. IMAGE COLLECTED ON MARCH 30, 2018.
5. DRAWING HAS BEEN SET WITH PROJECTION OF NORTH
CAROLINA STATE PLANE COORDINATE SYSTEM FIPS 3200 (NAD83).
DUKE 750 0
RAPHICSC7LE
50 1,500
It ENERGY® (IN FEET)
CAROLINAS
DRAWN BY: B. YOUNG DATE: 08/27/2019
'47 REVISED BY: C. WYATT DATE: 12/18/2019
CHECKED BY: E. WEBSTER DATE: 12/18/2019
APPROVED BY: B. WILKER DATE: 12/18/2019
synTerra PROJECT MANAGER: B. WILKER
www.synterracorp.com
ROW
,EA
Wk
LAKE -
NORMAN
LEGEND
AREA PROPOSED FOR ACTIVE GROUNDWATER
REMEDIATION
- ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN WASTE BOUNDARY
LANDFILL BOUNDARY
STRUCTURAL FILL BOUNDARY
- LANDFILL COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS MARSHALL
STEAM STATION SITE BOUNDARY
1 STREAM (MCKIM & CREED)
® WETLAND (MCKIM & CREED)
FIGURE ES-2
AREAS PROPOSED FOR CORRECTIVE ACTION
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
I.

Corrective Action Plan Update December 2019
Marshall Steam Station SynTerra
Figure ES-3
Proposed Corrective Action Approach
Provided in separate electronic figure file as a
large sheet size

0
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�LANDFILL#1
ILFSTRUCTURAL
FILL
MARSHALL STEAM STATION
PARCEL LINE
PV STRUCTURAL
FILL —fir
- a
� ASH BASIN?
i
ACCESS
ROSRAL FILL
-LANDFILL COMPLIANCE
BOUNDARY
FGD RESIDUE �.
LANDFILL BOUNDARY o
., o
YIA`HOLDIN�G BASIN ;,.S�A: �i • , �/� ��
GYP UM Ccuc
OALPILI
PAD
ral
SOURCE:
2016 USGS TOPOGRAPHIC MAP, TROUTMAN & LAKE NORMAN
NORTH QUADRANGLE, OBTAINED FROM THE USGS
STORE AT https://store.usgs.gov/map-locator.
DUKE CATAWBA
ENERGY® COUNTY
CAROLINAS
ASHEVIEEE
s)mTerra WWW.synterri
w
LANDFILL COMPLIANCE
BOUNDARY
LC&D LANDFILL
r7 P
DRY ASH LANDFILL
(PHASE II)
ASH BASIN COMPLIANCE.."'—
d BOUNDARY
O ASH BASIN
a WASTE BOUNDARY
LANDFILL COMPLIANCE--flf
1BOUNDARY
J BORROW AREA
y \
DRY ASH LANDFILL D
r t (PHASE 1)
ASH BASIN
STATION
D 0
0
FIGURE 1-1
USGS LOCATION MAP
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
DRAWN BY: B.YOUNG DATE: 05/15/2019 GRAPHIC SCALE
REVISED BY: B. YOUNG DATE: 12/10/2019 1,000 0 1,000 2,000
CHECKED BY: E. WEBSTER DATE: 12/10/2019
--------
APPROVED BY: B. WILKER DATE: 12/10/2019
PROJECT MANAGER: B. WILKER (IN FEET)

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ILF-2S ILF-2 • .... • I • I ■
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i ♦ ��
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■
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. 3B-7 CCR-16S `� GWA-7S
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■ AB-13S BRLL/BRLLL
CCR-16D GWA-7D
AB-13D -,-,I
M
SB-3 AB-14S
e•
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GWA-13S PVSF-4S
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• GWA-12D/BR
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AB-10S/SL
AB-12S/SL
AB-10D/BR/BRL
AB-12D/BR
AB-9S
aAB-81DU
--
AB-8D •- 1 OUTFALL 007
CCR-13D ,
SB-13 OB-1
�y CCR-12S (Dry Ash Landfill) MW-6S
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AB-21 S CCR-11 S
fi CCR-9S10, ti
� - AB 21 D CCR-11 D CCR-913A L�1
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• I �J I.1C f'9 '�
■ AB-4D SB-1 MW-8S
• I MW-9S MW-8D
• , • AB-SDU AB-SBR AB-3S AB-2S''k' hf
AB-3D AB-2D
• MS-11
CCR-2S CP-1S AB-2BR,
CCR-SS Tv ,}Fw �' �, '•F 4 _
• • CCR-21D CP-11D `•
• MW-PZ10 i CCR-5D :�=� �} F •! f'i 4 � ••t '�i � � �
■ MW-PZ2 MS-14 CP-16R i Y .f,
MW-PZ1 1
MS-13 CCR-1S CCR-4S ;r. Y 7; it �•
+ MW-PZ8 GP-2S CP-2S CCR-1D GWA-1S CCR-4D f
• • ■ e� MS-12
• MW-PZ3 GP-2D CP-2D GWA-1D
• 1 - LRB-1S GWA-2S GWA-1BR
• a OUTFACE 005 . •� / _
• ♦ MW-PZ4 MW-PZ9 GWA-2DA •
CCR-3S GRAPHIC SCALE
• \� ♦ LRB-2S _ • !� DUKE 490 0 490 980
4 MW-PZ5 \ BGSB GWA-2 •, CCR-3D ENERGY®
• MW PZ7 GP-3S • CAROLINAS (IN FEET!
GP-1S CP-3S OUTFACE 0028
ZGP-3D x�. DRAWN BY: C. WYATT DATE: 09/09/2019
CP-3D OUTFALL 002A ■ REVISED BY: C. WYATT DATE: 12/19/2019
♦ *- _�. +•+ ` CHECKED BY: E. WEBSTER DATE: 12/19/2019
• J • . • • Cro APPROVED BY: B. WICKER DATE: 12/19/2019 � t OUTFACE 003
—�/r , Y� PROJECT MANAGER: B. WILKER
�
z www.synterracorp.com
EIH2DN
Lake Norman
of Catawba
El F 2_DN
LEGEND
Q� MONITORING WELL IN ASH PORE WATER
Q� MONITORING WELL IN SHALLOW ZONE
Q� MONITORING WELL IN DEEP ZONE
Q� MONITORING WELL IN BEDROCK ZONE
11L MONITORING WELL ABANDONED
U PIEZOMETER IN SHALLOW ZONE
■ EFFLUENT WATER SAMPLE LOCATION
■ SURFACE WATER SAMPLE LOCATION
O NON -CONSTRUCTED SEEP PER SOC
® SOIL SAMPLE LOCATION
❑ IN -STREAM SURFACE WATER LOCATION
PER SOC (APPROXIMATE)
❑ SURFACE WATER / SEDIMENT SAMPLE LOCATION
♦ NPDES OUTFALL LOCATION
• WATER SUPPLY WELL
ASH BASIN WASTE BOUNDARY
LANDFILL BOUNDARY
STRUCTURAL FILL BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
LANDFILL COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS MARSHALL PLANT
SITE BOUNDARY
3111 STREAM (MCKIM & CREED)
WETLAND (MCKIM & CREED)
NOTES:
1. WELL LOCATIONS WERE DERIVED FROM VARIOUS SOURCES AND AREA MIX OF SURVEYED AND
APPROXIMATE LOCATIONS. THEREFORE, WELL LOCATIONS ARE TO BE DEEMED APPROXIMATE.
2. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY CORPS OF
ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO BE USED FOR
JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND STREAMS BOUNDARIES WERE
OBTAINED FROM STREAM AND WETLAND DELINEATION CONDUCTED BY MCKIM & CREED MARCH
2016,
3. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
4. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON JULY 26, 2018. IMAGE
COLLECTED ON MARCH 30, 2018.
5. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE COORDINATE
SYSTEM FIPS 3200 (NAD83).
FIGURE 1-2
SITE LAYOUT MAP
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

0 00
o� 01
m P
1
MARSHALL STEAM a 1 ` �°�'p.�
STATION PARCEL LINE
D ISLAND -POINT RD
0
\\ 1
�9
j
D
ASH BASIN ^WAS I E BOUNDARY a
O d 0
O USTREAM BASED ON 1962 DUKE DRAWING
0 � �
r o
I a
HISTORIC CATAWBA RIVER CHANNEL
c O BASED ON 1950 AERIAL PHOTOGRAPH
ASH BASIN
O
O
o
LAKE NORMAN
uuo
ALDq Rb G
F
s ;L
FUTURE MARSHALL
STEAM STATION21
S�
yO`�SC! GORDON�ST
° O 4Ap
rt,
fyF e1
SOURCES: 800
2016 LAKE NORMAN AND TROUTMAN USGS TOPOGRAPHIC MAPS OBTAINED FROM THE USGS STORE AT
http,.//store.usgs.gov/b2c_usgs/b2c/start/%%%28xcm=r3standardpitreK_prd%%%29/.do AND MODIFIED WITH /
PRE -BASIN CONTOURS OBTAINED FROM A DUKE POWER COMPANY-1962a PLANT MARSHALL-UNITS 1 & 2 SITE PLAN,
DRAWING NO. M-1, REVISION 15, DATED MARCH 19, 1987.
i
4' DUKE GRAPHIC SCALE
100D 0 1000 2000
ENERGY IN FEET FIGURE 1-3
CAROLINAS DRAWN BY: J. CHASTAIN DATE:4/16/2019 1962 TOPOGRAPHIC SURVEY
REVISED BY: C. NEWELL DATE: 9/3/2019
CHECKED BY: W.GERALD DATE:9/3/2019 CORRECTIVE ACTION PLAN UPDATE
APPROVPROJECTED BY: B. WILKER MANGER: B. WILKER DATE:9/3/2019 MARSHALL STEAM STATION
LAYOUT: FIG 1-3-1962 (USGS) TERRELL, NORTH CAROLINA
s mTerra www.synterracorp.com

MARSHALL STEAM
STATION PARCEL LINE
I
1
l I.
1
/
F I
+u
sra •"
I FUTURE
STEAM
■
/ ry+
1.
SOURCE:
NOVEMBER 13, 1950 AERIAL PHOTOGRAPH OBTAINED FROM THE USGS EARTH EXPLORER WEB SITE AT
http://ea rthexpl orer.usgs.gov/
DUKE
GRAPHIC SCALE
�' ENERGY
1000 0 1000
N FEET
2000
CAROLINAS
DRAWN BY: J. CHASTAIN
DATE: 7/8/2019
REVISED BY: C. NEWELL
CHECKED BY: E. WEBSTER
DATE: 8/21/2019
DATE:8/27/2019
16
10
APPROVED BY: B.WILKER
DATE: 8/27/2019
PROJECT MANAGER: B WILKER
* nTem
www.synterracorp.com
SHORELINE OF
IRMAN
x
E\
7
FIGURE 1-4
1950 AERIAL PHOTOGRAPH
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

Y r s BGABRA
GWA-8S
0010
100
�. rr GWA 4S ! 4 wjt; •w '<<�� 'GWA 5S i �., BG-3S/BR
"f + E ®■� MW-4DS
MW 4 yz a rJ..J f
• r '� '. yeti . BG-2S
♦♦✓■ f. �r '� ♦uGWA-6S '•. i. .fir, �♦
�, ti—•���♦' �'�� �� I• 11 / '' r r r Sherrills 44" t�� •�,�
•. Ford
Jib
.. a k: T a i ♦ .a. c' 0
♦� 7 i1 1, y- C+ r II
•'n G 7•. `_'jam • t R• 9 - (!Y
f
.�„ ♦ - - ✓- ° '..l 1 ■ 1 ins 7s r�
GWA-12S/BRF `> r ♦ {�
y J LEGEND
MS-10 ♦ , •` ,, O GROUNDWATER SAMPLE LOCATION
A
• SOIL SAMPLE LOCATION
0 SOIL AND GROUNDWATER SAMPLE LOCATION
.N n. ti a �t '• 1 SURFACE WATER AND SEDIMENT SAMPLE LOCATION
ri
ASH BASIN WASTE BOUNDARY
�+•„ �`. >.' v,y ' - — - ASH BASIN COMPLIANCE BOUNDARY
LANDFILL BOUNDARY
1
j /' STRUCTURAL FILL BOUNDARY
NOTES: _ i s ,,/ a •��' ' / r, v� 1 LANDFILL COMPLIANCE BOUNDARY
Al "1. SAMPLE LOCATIONS WERE DERIVED FROM VARIOUS SOURCES AND ARE AMIX
�`=.•• ,♦ _* `0. ♦ �,' � 'cr 'r ;r4, o;Z' - - DUKE ENERGY CAROLINAS PROPERTY LINE
OF SURVEYED AND APPROXIMATE LOCATIONS. THEREFORE, SAMPLE LOCATIONS %♦ f . • t. '� /'♦ STREAM (MCKIM &CREED)
ARE TO BE DEEMED APPROXIMATE. ♦ '
2. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US WETLAND (MCKIM & CREED) � , ` - � ' � •, �` ♦♦
ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS -
NOT TO BE USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE . ' ♦ GRAPHIC SCALE
WETLANDS AND STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND ♦ (•n ENERGY DUKE 490 0 490 980 FIGURE 4-1
�► f
WETLAND DELINEATION CONDUCTED BY MCKIM &CREED MARCH 2O16. : _� -^'"� '_� �r BACKGROUND SAMPLE LOCATION MAP
3. ALL BOUNDARIES ARE APPROXIMATE. ram'.. CAROLINAS (IN FEET)
4. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS. ♦ �� - _ - * DRAWN BY:C.WYATT DATE:09/25/2019 CORRECTIVE ACTION PLAN UPDATE
♦ - r' i' REVISED BY: C. WYATT DATE: 12/23/2019
5AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON JULY 26, � CHECKED BY: E.WEBSTER DATE:12/23/2019 MARSHALL STEAM STATION
2618. IMAGE COLLECTED ON MARCH 30,2018. _ APPROVED BY: B.WILKER DATE:12/23/2019 TERRE ORTH CAROLINA
l s PROJECT MANAGER: B. WILKER L
6. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE Terra RIPS-�� '
PLANE COORDINATE SYSTEM PS 3200 (NAD83). y ■�,Y =' . - L
www.synterracorp.com

GENERALNOTES
NOTES
1) GENERALIZED AREAL EXTENT OF MIGRATION REPRESENTED BY CONSTITUENT CONCENTRATIONS GREATER
THAN NCAC 02L, IMAC, OR BACKGROUND IN MULTIPLE FLOW ZONES.
2) PERMANENT WATER SUPPLY HAS BEEN IMPLEMENTED PROVIDING 65 SURROUNDING WELL USERS WITH
CONNECTIONS TO PUBLIC WATER SUPPLY OR WATER TREATMENT SYSTEMS. THIS WORK WAS COMPLETED
IN ACCORDANCE WITH HB630 AND SUBSEQUENTLY APPROVED BY NCDEQ ON OCTOBER 12, 2018.
3) ALL BOUNDARIES ARE APPROXIMATE.
ENERGY
CAROLINAS
41P
synTerra
SITE FEATURES KEY
O GROUNDWATER FLOWS FROM RIDGES THAT COINCIDE WITH
GROUNDWATER DIVIDES, WHICH PROVIDE HYDRAULIC CONTROL
KEEPING CONSTITUENT MIGRATION WITHIN FORMER STREAM VALLEYS
AND AWAY FROM WATER SUPPLY WELLS
© LIMITED CONSTITUENT MIGRATION THROUGH THE SAPROLITE, TRANSITION
ZONE, AND INTERCONNECTED BEDROCK FRACTURES BENEATH THE ASH BASIN
© FORMER STREAM CHANNELS IN ASH BASIN
O PONDED WATER IN THE ASH BASIN CAUSES LIMITED AREA OF
DOWNWARD VERTICAL MIGRATION OF CONSTITUENTS NEAR THE DAM
DUE TO ELEVATED HYDRAULIC HEAD
©UPWARD VERTICAL GRADIENTS IN GROUNDWATER IMMEDIATELY
DOWNGRADIENT OF THE ASH BASIN DAM LIMIT VERTICAL MIGRATION OF
CONSTITUENTS AS GROUNDWATER MIGRATES TOWARD LAKE NORMAN
O AREA OF COI CONCENTRATION GREATER THAN CRITERIA BEYOND THE
02L BORON PLUME
AREA OF COI CONCENTRATION IN GROUNDWATER GREATER THAN CRITERIA
(SEE GENERAL NOTE 1)
00-0- GENERALIZED GROUNDWATER FLOW DIRECTION
ON-6- GENERALIZED ASH PORE WATER FLOW DIRECTION
STREAM
---> APPROXIMATE FORMER STREAM WITH FLOW DIRECTION
ASH BASIN WASTE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
®GENERAL AREA OF WATER SUPPLY WELL USERS
(SEE GENERAL NOTE 2)
PREDOMINANT BEDROCK FRACTURE ORIENTATION
ON OF PRE -DECANTING CONDITIONS
)T TO SCALE)
EARTHEN
DAM
(FILL)
LAKE
�� NORMAN
DEPICTION NOT TO SCALE
DRAWN BY: A. FEIGL DATE: 8/19/2019
REVISED BY: C. NEWELL DATE: 12/13/2019
CHECKED BY: E. WEBSTER DATE: 12/13/2019
APPROVED BY: W. GERALD DATE: 12/13/2019
PROJECT MANAGER: B. WILKER
www.synterracorp.com
FIGURE 5-1
CONCEPTUAL SITE MODEL -
PRE -DECANTING CONDITIONS
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
A' I

Corrective Action Plan Update December 2019
Marshall Steam Station SynTerra
Figure 5-2
LeGrand Slope Aquifer System
Included in Section 5 text

Corrective Action Plan Update December 2019
Marshall Steam Station SynTerra
Figure 5-3
Generalized Profile of Ash Basin Pre -
Decanting Flow Conditions in the
Piedmont
Included in Section 5 text

Corrective Action Plan Update December 2019
Marshall Steam Station SynTerra
Figure 5-4a
Water Level Map —Shallow Flow Zone
(May 2019)
Provided in separate electronic figure file as a
large sheet size

Corrective Action Plan Update December 2019
Marshall Steam Station SynTerra
Figure 5-4b
Water Level Map —Deep Flow Zone (May
2019)
Provided in separate electronic figure file as a
large sheet size

Corrective Action Plan Update December 2019
Marshall Steam Station SynTerra
Figure 5-4c
Water Level Map —Bedrock Flow Zone
(May 2019)
Provided in separate electronic figure file as a
large sheet size

ti
_--I
fir
■ ]r
4.
—+ - �► ' � N.
No
w � , � r►
*00
�. IN -.
4b 'No
ell 'v
Ap
all
400
IIIIIIIIIIIIIIft -IN
LEGEND
NOTES: `y /%
1. VELOCITY MAGNITUDES IN FEET PER DAY (FT/DAY). r; � ASH BASIN WASTE BOUNDARY
2. VELOCITY VECTORS ARE IN THREE DIMENSIONS. t ~� ■ ■ ■ 1 ASH BASIN COMPLIANCE BOUNDARY
3. VELOCITY VECTOR DIRECTIONS SHOWN AS BLACK •
ARROWS. —* • — — • LANDFILL BOUNDARY
4. UPDATED GROUNDWATER FLOW AND TRANSPORT STRUCTURAL FILL BOUNDARY
MODELING REPORT FOR MARSHALL STEAM STATION, ■
TERRELL, NORTH CAROLINA, 2019 (FALTA, GRAZIANO, LANDFILL COMPLIANCE BOUNDARY
GEBRAI, EBENHACK, MURDOCH, AND YU, 2019).
53HE WATERS OF THE US DELINEATION HAS NOT BEEN
APPROVED BY THE US ARMY CORPS OF ENGINEERS AT
THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO BE
USED FOR JURISDICTIONAL DETERMINATION PURPOSES.
THE WETLANDS AND STREAMS BOUNDARIES WERE
OBTAINED FROM STREAM AND WETLAND DELINEATION
CONDUCTED BY MCKIM & CREED MARCH 2O16.
DUKE
GRAPHIC SCALE
500 0 500 1,000
- DUKE ENERGY CAROLINAS PROPERTY LINE
STREAM (MCKIM & CREED)
FIGURE 5-5a
4ENERGY
oN FEED
VELOCITY VECTOR MAP
6. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY
CAROLINAS
FOR PRE -DECANTING CONDITIONS
CAROLINAS.
DRAWN BY: A. ROBINSON
DATE: 05/21/2019
REVISED BY: C. WYATT
DATE: 12/11/2019
DEEP FLOW ZONE
7. ALL BOUNDARIES ARE APPROXIMATE.
CHECKED BY: E.WEBSTER
DATE: 12/11/2019
CORRECTIVE ACTION PLAN UPDATE
8. DRAWING HAS BEEN SET WITH A PROJECTION OF
,
APPROVED BY: B. WILKER
DATE: 12/11/2019
MARSHALL STEAM STATION
NORTH CAROLINA STATE PLANE COORDINATE SYSTEM
�
Z�`"u
PROJECT MANAGER:B.WILKER
TERRELL, NORTH CAROLINA
FIPS 3200 (NAD83).
www.synterracorp.com

FAF-Wisimliff Sal
1 .-
R Jo �� 10
•r 1
.000
1a�►� ,r _
_ •��,,�. -'�' 1 is i L
it
tt
woo -
�� t it
oe
46
1 -4b r�' r ter rr oolo
t
loo
-- LEGEND
NOTES: -� 110 -
1. VELOCITY MAGNITUDES IN FEET PER DAY (FT/DAY).
2. VELOCITY VECTORS ARE IN THREE DIMENSIONS. �� ■ 1 ASH BASIN COMPLIANCE BOUNDARY
3. VELOCITY VECTOR DIRECTIONS SHOWN AS BLACK r� ! ASH BASIN WASTE BOUNDARY
ARROWS. J T
4. UPDATED GROUNDWATER FLOW AND TRANSPORT OI • LANDFILL BOUNDARY
MODELING REPORT FOR MARSHALL STEAM STATION, y + STRUCTURAL FILL BOUNDARY
TERRELL, NORTH CAROLINA, 2019 (FALTA, GRAZIANO,
GEBRAI, EBENHACK, MURDOCH, AND YU, 2019).
M LANDFILL COMPLIANCE BOUNDARY
53HE WATERS OF THE US DELINEATION HAS NOT BEEN
APPROVED BY THE US ARMY CORPS OF ENGINEERS AT
THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO
BE USED FOR JURISDICTIONAL DETERMINATION
PURPOSES. THE WETLANDS AND STREAMS
BOUNDARIES WERE OBTAINED FROM STREAM AND
WETLAND DELINEATION CONDUCTED BY MCKIM &
CREED MARCH 2O16.
6. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY
CAROLINAS.
7. ALL BOUNDARIES ARE APPROXIMATE.
8. DRAWING HAS BEEN SET WITH A PROJECTION OF
NORTH CAROLINA STATE PLANE COORDINATE SYSTEM
FIPS 3200 (NAD83).
GRAPHIC SCALE
(> DUKE
ENERGY
500 0
oN FEET)
500 1,000
CAROLINAS
DRAWN BY: A. ROBINSON
DATE: 05/21/2019
REVISED BY: C. WYATT
CHECKED BY: E. WEBSTER
DATE: 12/11/2019
DATE: 12/11/2019
APPROVED BY: B. WILKER
DATE: 12/11/2019
PROJECT MANAGER: B. WILKER
— - DUKE ENERGY CAROLINAS PROPERTY LINE
STREAM (MCKIM & CREED)
FIGURE 5-5b
VELOCITY VECTOR MAP
FOR CLOSURE -BY -EXCAVATION CONDITIONS
DEEP FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

4 fill
� _ r
•# "� �► �+ `
1 1
Iwo
.005
lb
J
el 0
LEGEND
ell
-
NOTES: �� J
1. VELOCITY MAGNITUDES IN FEET PER DAY (FT/DAY). �*
2. VELOCITY VECTORS ARE IN THREE DIMENSIONS. ;
�! 1 L .• `'x � ASH BASIN WASTE BOUNDARY
3. VELOCITY VECTOR DIRECTIONS SHOWN AS BLACK t + ■ 1 ASH BASIN COMPLIANCE BOUNDARY
ARROWS.
�► +�4. UPDATED GROUNDWATER FLOW AND TRANSPORT � LANDFILL BOUNDARY
MODELING REPORT FOR MARSHALL STEAM STATION, STRUCTURAL FILL BOUNDARY
TERRELL, NORTH CAROLINA, O H, A D YU,, GRA019). NO, �I j
GEBRAI, EBENHACK, MURDOCH, AND YU, 2019).
LANDFILL COMPLIANCE BOUNDARY
53HE WATERS OF THE US DELINEATION HAS NOT BEEN
APPROVED BY THE US ARMY CORPS OF ENGINEERS AT
THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO
BE USED FOR JURISDICTIONAL DETERMINATION
PURPOSES. THE WETLANDS AND STREAMS
BOUNDARIES WERE OBTAINED FROM STREAM AND
WETLAND DELINEATION CONDUCTED BY MCKIM &
CREED MARCH 2O16.
6. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY
CAROLINAS.
7. ALL BOUNDARIES ARE APPROXIMATE.
8. DRAWING HAS BEEN SET WITH A PROJECTION OF
NORTH CAROLINA STATE PLANE COORDINATE SYSTEM
FIPS 3200 (NAD83).
GRAPHIC SCALE
(> DUKE
ENERGY
500 0
oN FEET)
500 1,000
CAROLINAS
DRAWN BY: A. ROBINSON
DATE: 05/21/2019
REVISED BY: C. WYATT
CHECKED BY: E. WEBSTER
DATE: 12/11/2019
DATE: 12/11/2019
APPROVED BY: B. WILKER
DATE: 12/11/2019
synTena
PROJECT MANAGER: B. WILKER
www.synterracorp.com
DUKE ENERGY CAROLINAS PROPERTY LINE
STREAM (MCKIM & CREED)
FIGURE 5-5c
VELOCITY VECTOR MAP
FOR CLOSURE -IN -PLACE CONDITIONS
DEEP FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

NOTES:
I .
■
. I
♦ h /
� -� ■ � J ♦ �1 poi • � f�
1 I♦ >
. . l
1 � r �
N �
oho � 1 H Z_UP
� a
% - r � , '� OUTFACE 007
H 2_HCA
1
� \ • ' .�' S 4 `tea /
J OUTFACE 002 r
I r
/
�• ,. L
�� � 1 � OUTFACE 005 / `r./ ♦� _ ,,
� ♦� OUTFACE 0028 �♦ \7 ,
♦ OUTFACE 002A ,♦ ;
■ �' /
RAW WATER INTAKE /
FOR PLANT OPERATIONS OUTFACE 003 �♦ ,.
,♦ - - - -� /♦r ',� GREENWOOD RD
y ,
(' DUKE 790 GRAPHIC SCAE
790 1,580
4 ENERGY® N FEET,
CAROLINAS
DRAWN BY: C. WYATT DATE: 09/09/2019
REVISED BY: C. WYATT DATE: 12/19/2019
CHECKED BY: E. WEBSTER DATE: 12/19/2019
APPROVED BY: B. WILKER DATE: 12/19/2019
PROJECT MANAGER: B. WILKER
�lierrills
i Ford
r V1�
•y .-'.00,
" Lake Norman
Terrell of Catawba
.1 11Wil M.
LEGEND
FIGURE 5-6
MAP OF SURFACE WATERS
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

i .4—
h
r �
MR1010 , r
MR1008 I �
�♦ ` MR18 • •.
MR42 (1007) MR17�•
MRI
MR1001
MR38 MR37 ► _ r� MR6 �
' ►
MR .
20
MR33 ►•
MR43 MR1
MR25
MR23 ♦�♦'�
MR11 MR12 (MR1000)
MR40 MR10
MR8
MR46 MR22 ' '
I
MR32 MR21 l ,,
MR16
Ny t
N
�y�° MR35 TP`N MR36 MR9
MR13 j{1
gyp'( O1� ! "s
r ,
• 0 /
r
MR1002 f
r
MR1005 %. • ►
v � w
MR1006 .AS•�'•4 ® � rat•" ``t r
• • ��� .�
rMR47
tt
r
_ MR1004 o
0 ` p
a
00 •.jl � MR30
•
MR1003
J
BORRO
AREA
r r'
4 �N
Rr
ri • � 5
♦/
LEGEND
/ • WATER SUPPLY WELL
♦
r
4DUKE 790 GORAPHIC SCALE790 1,580
ENERGY
CAROLINAS ON FEET)
DRAWN BY. C. WYATT DATE: 11/04/2019
J�jp REVISED BY. C. DAVIS DATE: 12/19/2019
CHECKED BY: E. WEBSTER DATE: 12/19/2019
APPROVED BY: B. WILKER DATE: 12/19/2019
synTerra PROJECT MANAGER: B. WILKER
www.synterracorp.com
0 ,
ASH BASIN WASTE BOUNDARY
- — - ASH BASIN COMPLIANCE BOUNDARY
LANDFILL COMPLIANCE BOUNDARY
LANDFILL BOUNDARY
STRUCTURAL FILL BOUNDARY
-- DUKE ENERGY CAROLINAS PROPERTY
> STREAM (MCKIM & CREED)
WETLAND (MCKIM & CREED)
NOTES:
1. INFORMATION PROVIDED IN MARSHALL STEAM STATION HB 630 PROVISION OF
PERMANENT WATER SUPPLY COMPLETION DOCUMENTATION, DUKE ENERGY,
AUGUST 31, 2018 (APPENDIX D ).
2. ONLY WATER SUPPLY WELLS SAMPLED BY NC DEQ ARE LABELED.
3. WATER SAMPLE WELL ANALYTICAL RESULTS ARE LOCATED ON TABLE 6-9
4. NON -DUKE PARCEL BOUNDARIES PROVIDED BY CATAWBA COUNTY GIS WEBISTE
AT https://www.catawbacountync.gov/online-services/datasets/.
5. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US
ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT
TO BE USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND
DELINEATION CONDUCTED BY MCKIM & CREED MARCH 2O16.
6. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
7. ALL BOUNDARIES ARE APPROXIMATE
8. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON JULY 26, 2018.
IMAGE COLLECTED ON MARCH 30, 2018.
9. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83).
FIGURE 5-7
WATER SUPPLY WELL SAMPLE LOCATIONS
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

•
0
_ ' y
M.'
PV
STRUCTURAL
FILL
• 't 0
' r
`.:
71
A, Q
= 0
K
0
f'
MARSHALL
STEAM STATION
♦ /WNW
♦11,00-0
_I
U
s�
r /
A
f�DUKE 790 Go APHIc sc790 1,580
r� ENERGY®
CAROLINAS ON FEET)
DRAWN BY: C. WYATT DATE: 11/04/2019
J�jp REVISED BY: C. DAVIS DATE: 12/19/2019
CHECKED BY: E. WEBSTER DATE: 12/19/2019
APPROVED BY: B. WILKER DATE: 12/19/2019
synTerra PROJECT MANAGER: B. WILKER
www.synterracorp.com
LEGEND
PUBLIC WATER SUPPLY
WATER TREATMENT SYSTEM
OPT OUT OR NON -RESPONSIVE
LOCATIONS DEEMED NOT ELIGIBLE
(BUSINESS/CHURCH/SCHOOL
LOCATIONS DEEMED NOT ELIGIBLE PER HOUSE
BILL 630 (BUSINESS/CHURCH/SCHOOL) BUT
VOLUNTARILY SUPPLIED PERMANENT WATER
SOLUTION
VACANT PARCEL
• WATER SUPPLY WELL
0.5-MILE RADIUS FROM ASH BASIN COMPLIANCE
- BOUNDARY
ASH BASIN WASTE BOUNDARY
- - - ASH BASIN COMPLIANCE BOUNDARY
LANDFILL COMPLIANCE BOUNDARY
LANDFILL BOUNDARY
STRUCTURAL FILL BOUNDARY
-- DUKE ENERGY CAROLINAS PROPERTY LINE
STREAM (MCKIM & CREED)
WETLAND (MCKIM & CREED)
NOTES:
1. INFORMATION PROVIDED IN MARSHALL STEAM STATION HB 630 PROVISION OF
PERMANENT WATER SUPPLY COMPLETION DOCUMENTATION, DUKE ENERGY,
AUGUST 31, 2018 (APPENDIX D).
2. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US
ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT
TO BE USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND
DELINEATION CONDUCTED BY MCKIM & CREED MARCH 2O16.
3. NON -DUKE PARCEL BOUNDARIES PROVIDED BY CATAWBA COUNTY GIS WEBISTE
AT https://www.catawbacountync.gov/online-services/datasets/.
4. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
5. ALL BOUNDARIES ARE APPROXIMATE.
6. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON JULY 26, 2018.
IMAGE COLLECTED ON MARCH 30, 2018.
7. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83).
FIGURE 5-8
HB 630 PROVISION OF PERMANENT
WATER SUPPLY COMPLETION MAP
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

Corrective Action Plan Update December 2019
Marshall Steam Station SynTerra
Figure 6-1
Fly Ash and Bottom Ash Interbedded
Depiction
Included in Section 6 text

900
800
700
600
z
O
Q
w 500
J
LU
400
300
200
A Ill. A'
ASH BASIN WASTE POWER LINE
(NORTHWEST) BOUNDARY RAW ASH BASIN WASTE (SOUTHEAST)
BOUNDARY
0 N m ASH BASIN 900
0000 BEND IN DAM
a a m CROSS SECTION
Q Q Q Q Q Q Q m O N N m 0 fn J
SAPROLITE FILL p� rn $
v� _ FILL _ m mi m m m pj Oj nj m m m 0�
¢ ¢ ¢ ¢ ¢ ¢ ¢
ASH
-ASHPO EWATER �OO
LAKE NORMAN
_ ______ __ -
/ — ---_ _805.31=====___------------------------- --- - � / _ ♦ � / - �► ___ ________fir -==_ASH PORE WATER ____
/ \ SAPROLITE____________________________________________________________EL. 760
TRANSITION ____________________________________________ FILL
ZONE _ ♦ / 803. __====-r_==_ __ _'�_= ASH PORE WATER _________
791.13 7=__-----=-======= --_____=======--=-=-=--_====_-- __-___ 771.25 763.12
/,`/\ \'/1" /\� ♦/ /\� 1 /\ " /\'/1` /\� / I \/_ \�/,`/ /\I ♦/ /\'/1` 792.23 /\,r♦/- SAPROLITE �► ------ _____
1 \ \ / 1 \ / TRANSITION �►
/ / 791.0 _
/�—_\— '/♦--��\�/� /♦/—��1� \—\//`/—� 1�/♦ --/.807 _\—\ '`�—��\�/� —\ \l/`/— 1j/. \—\l/`/ ZONE 60/ /
\ I-\/� \ I/ \/� \ I \ \ / / \/� \ I-\/� \ / I/ \lam \ I-\/� \ / I / \l \ I I / /� ♦ -\/� / I/ \/� \ /� \ /lp' 700
I \/ / I ♦/ I / / I ♦/_ I \/ / I \/_- I ♦/ / I \/ I \/ / I \/ I \/ I \ --- \/ /\I \/ I \/ / I \ I \/ / I \/ I` \/ / I ` 73.93 /_ /\I ♦/-\ I. /\�_
\
\; /I / \` � � '/I � \�i �\ / I / \`� � � /I � \�i l ♦ / I \`� � '/I � \♦i ♦ / / \`� � // / \`i l � / I / \`� � I / \ i l \ / I / \`i � / I / \ i l \ / I / \`i ♦ / I / \ i l � / 1 / \`i ♦ / I / \ i l � / I / \`i \ / I / \ i l \ / I / \`i \ / I / � V
♦ / 1 / \l i \ / i ♦ / 1 / \ l ♦ I _ \ / i ♦ / 1 / \l i \ I _ \ / i ♦ / \ l i \ I _ \ / i ♦ / I / \n -1 / I / \ l i I \ / i \ / I / \l i I \ / i ♦ / I \ l i \ I \ / i / I / LLG -11-a ♦ / I / \ l \ I i / / \ l i ♦ I \ / i \ / I / \ l 600
`/ /\'/1` /\I \ //\I/1" /\I\ "\ \'/1" /\I` `/ \/\I/1" /\I` " /\'/1 ' /\I \ / /\I `/ I \ / / I `/ I \ / I ♦ / I` \ / / I ♦ / I \ / I `/ I I ` I` \ /
/BEDROCK\`� / I / \ i / ♦ / }.�\`i i/ 1L\ i l\/ \`i l \ / I / \ l\/ I / \`i l ♦ / I \ i / \\/ I / \`� / ♦ / I \ i l \\/ I / \`� l ♦ I / \ i l\�T - l / / - l \ \\- l / - l \ \\ / / - l \ - \\- l / / - l \ \\
I ` / -/ \I \ " I � / / \I . /- I . / / \ "- I ` / \I \ /- I . / / \I . /- I ♦ / / \I ♦ /- I ♦ / / \I . /- I ♦ / / \I . /- I . / / \I ` - I . / / \ ` /- I / / \I . / I ♦ /
♦ / 1 / \l i I - \/ i \ / 1 / \ l i I - \/ i \ / 1 / \l i \ I - \/ i / I / \ i \ I _ \/ i / I / BEDROCK 1 _ \/ \ / I / \ l i ♦ 1 _ / i \ / 1 / \l i ♦ I \/ i / 1 / \ lNV,
I - \/ i I / �l i \ I i ♦ / I / \ l i \ I _ \/ i \ / , / \l i ♦ I T�/ i \� I / \ l 500 LLI
I` ♦/_-`il. /\�_i'I`/ _\il. /♦� \�I./\/-♦i / - _ I�/♦/ -\'./ - -\'I`/♦/ \'./ - _\'. / _\'./ - -BEDROCK/ \ 1 \ / 1 \ \ / , \ \ / 1 / \ / , \ \ / 1 / \ / , \/ 1 \ / \ / , \ \' / 1 \ / \ / , \ \Lu
L� / �
♦/I/\`i ♦/I/\il♦ I/\`i ♦1-I r/♦/I/\`i \/I \i/�/I/\` \/I/\il♦ I/\`i ♦/I/\i \/I/\`i ♦/I/\ /`/I/\`i \/I/\i/♦/I/\`� /I/ -/ / \� \/I/T / / `i \/I \il / / `i ♦/I/\il\/I/\`
1"7
i`'I�\/\♦./I�\/'i`\''\/\`./I�\/\i`\''\l\�`./I�\'i``/��\l\./I�\''�\lam\�♦./1�\l'i`'\l\♦./1�\l'i`\''\l\`./I�\''\l\`./I�\l'i``'I�\�`./I�\l'i`'1�\l \�`./L \i``''�\l'♦i`./I�\l��\\/Ii\/\
_ C 400
,�\ /1 \/� /1/ �/�'/1"\/�I/,/�\,iI/1♦/\/�I/,�/\,il/1♦/\/\'/1;'\/\'/1"\/\'/1;'\/\'/1"\/\'/1;�\/\'/1"\/\'/1;'\/\I/1"\/\'/1;'\/\I/1"\ I ..
\ / I / \ i � I / \ i ♦ / I / \ � � I / \ i ♦ / I / \ � � I / \ i ♦ / I / \ � � I / \ i ♦ / I � \ � � I / \ i \ / I / \ � � I / \ i \ / I / \ � � I / \ i ♦ / I / \ � � I / \ i ♦ / I / \ � � I / \ i \ / I � \ � � I / \ i \ / I � \ � � I / \ i \ / I / \
� „ ` / \ / \ / 1 \ / \ � / 1 " \ / \ / 1 \ / \ � / 1 " \ / \ / 1 \ / \ � / 1 " \ / \ / 1 \ / \ � / 1 " \ / ♦ / 1 \ / \ � / 1 " \ / ♦ / 1 \ / \ � / 1 " \ / \ / 1 \ / \ � / 1 " \ / \ / 1 \ / \ � / 1 " \ / \ / 1 \ / \ � / 1 " \ / \ / 1 \ / \ � / 1 " \ / \ / 1 \ / \ � / 1 " \
I _ \/i , / I \lam ; 1 _ \/. \ / I \/� ; 1 _ \/. \ / I \/� ; I - \/i , / I \lam ; I - \/i , / I \lam ; I _ \/. . / I \/� ; I _ \/. \ / I \/� ; I - \/. \ / I \/ 300
�„`/\/\ /1, \/\'/1" \/\ /1, \/\'/1"\/\ /1/ \/\'/1" \/\ /1/ \/\'/1"\/\ /1, \/\'/1" \/\ /1, �\/\�/1"\/\ /1, \/\'/1" \/\ /1/ \/\'/1"\/\ /1/ \/\'/1" \/\ /1/ \/\'/1"\/\ /1 /\� ♦ /
200
LEGEND
INDUSTRIAL
".
AB 9S
LANDFILL #1 e
�
AB-1D
AB-15BR
�
AB-15S
DRYASH
AB 18D
LANDFILL
(PHASE II)
ASH BASIN
PV STRUCTURAL
DRY ASH
FILL
LANDFILL
(PHASE 1)
— — —
'q�
ASH BASIN
LAKE
NORMAN
FGD RESIDUE
LANDFILL
NOTE:
803.04
CROSS SECTIONS ARE LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
WELL IN SAPROLITE MATERIAL
SHALLOW FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
WELL IN TRANSITION ZONE
WELL IN BEDROCK
DEEP FLOW LAYER GROUNDWATER
NOTES
WELL WATER LEVEL ELEVATION
WELL IN ASH PORE WATER
1. WATER ELEVATIONS ARE FROM THE MAY 2019 GAUGING EVENT. NOTE ELEVATIONS WITHIN EACH
CLUSTER ARE MEASURED REFERENCED TO NORTH AMERICAN VERTICAL DATUM 1988.
ABANDONED WELL
BEDROCK FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENT THE GENERALIZED
GENERALIZED WATER TABLE
ORIENTATIONS OF THE TWO MOST PREVALENT FRACTURE SETS OBSERVED AT THE SITE BASED ON
TELEVIEWER LOGGING AT SITE -SPECIFIC BOREHOLES. THEY ARE SHOWN WITH APPROPRIATE
GENERALIZED GROUNDWATER
ASH PORE WATER FLOW LAYER
APPARENT DIP, WITH VERTICAL EXAGGERATION. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO
FLOW DIRECTION
WATER LEVEL ELEVATION
NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTHS AND LENGTHS OF
GENERALIZED ASH PORE WATER
FRACTURES VERSUS DEPTH ARE CONCEPTUAL ONLY.
FLOW DIRECTION
WELL SCREEN
3. ALL BOUNDARIES ARE APPROXIMATE.
PREDOMINANT BEDROCK
FRACTURE ORIENTATION
4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS.
ASH BASIN COMPLIANCE BOUNDARY
ASH
ASH BASIN WASTE BOUNDARY
ASH PORE WATER
FILL
SAPROLITE
TRANSITION ZONE
BEDROCK
SURFACE WATER
WATER LEVEL ELEVATION - MAY 2019 (NAVD-88)
(LABEL COLORING BY FLOW ZONE)
GENERALIZED VERTICAL
HYDRAULIC GRADIENT
DUKE
A' ENERGY
CAROLINAS
l0p
synTero
GRAPHIC SCALE
0 350 700
HORIZONTAL SCALE: 1" = 700'
VERTICAL SCALE: V = 140'
5X VERTICAL EXAGGERATION
DRAWN BY: J. CHASTAIN DATE: 08/01/2019
REVISED BY: D. KREFSKI DATE: 12/11/2019
CHECKED BY: B. WILKER DATE: 12/11/2019
APPROVED BY: B. WILKER DATE: 12/11/2019
PROJECT MANAGER: B. WILKER DATE: 12/11/2019
www.synterracorp.com
FIGURE 6-2
GENERAL CROSS SECTION A -A'
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

900-
800-
w 700
Z
_O
Q
w 600
W
500-
400-
INDUST4L"o"4",
LANDFI-
4
DRY ASH
LANDFILL
(PHASE II)
ASH BASIN
PV STRUCTURAL DRY ASH
FILL LANDFILL
(PHASE I)
ASH BASIN
B B.
FGD RESIDUE
LANDFILL
NOTE:
CROSS SECTIONS ARE LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
B --a B'
(WEST) _ I (EAST)
� ASH BASIN COMPLIANCE
BOUNDARY
ASH BASIN WASTE -I
BOUNDARY
LAKE NORMAN
EL. 760
/794.7M / \ / ` I TRANSITION ZONE SAPROLITE -
`768 / 43
1
�./ ♦ice/ ♦��/ - ♦i./ ♦��/.- _♦ice/ - _♦�./ ♦♦♦���' ��� �
\'/1`�- \I ♦�\ \'/1`/- \I ♦1\ BEDROCK /\I ♦/\/\I/1`�
i \ /1
A/ I i \♦i �� / I / \ i l \ / I i \\i \ / 1 / \ i A1� / l i \\i � / I / \ i l � / l i \\i � / � \ i l \ / I _L 1 \ / I / \
\'/1��\/\I/1�� \/\'/1��\/\'/1��\/\ly���/\'/1♦/ \/\I/1��\/\I/1 �\/\I ♦ ii j\I/1�� \/\'/1��\
LEGEND
mr
794.54
WELL IN SAPROLITE MATERIAL
SHALLOW FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
WELL IN TRANSITION ZONE
DEEP FLOW LAYER GROUNDWATER
WELL IN BEDROCK
WELL WATER LEVEL ELEVATION
WELL IN ASH PORE WATER
BEDROCK FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
GENERALIZED WATER TABLE
ASH PORE WATER FLOW LAYER
GENERALIZED GROUNDWATER
WATER LEVEL ELEVATION
FLOW DIRECTION
GENERALIZED ASH PORE WATER
®
WELL SCREEN
FLOW DIRECTION
PREDOMINANT BEDROCK
FRACTURE ORIENTATION ASH BASIN COMPLIANCE BOUNDARY
ASH ASH BASIN WASTE BOUNDARY
ASH PORE WATER
FILL
SAPROLITE
TRANSITION ZONE
BEDROCK
SURFACE WATER
WATER LEVEL ELEVATION - MAY 2019 (NAVD-88)
(LABEL COLORING BY FLOW ZONE)
�DUKE
APENERGY
GENERALIZED VERTICAL
CAROLINAS
HYDRAULIC GRADIENT
synTena
-900
800
700 c�
Z
_O
Q
600 J
W
500
400
NOTES
1. WATER ELEVATIONS ARE FROM THE MAY 2019 GAUGING EVENT. NOTE ELEVATIONS WITHIN EACH
CLUSTER ARE MEASURED REFERENCED TO NORTH AMERICAN VERTICAL DATUM 1988.
2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENT THE GENERALIZED
ORIENTATIONS OF THE TWO MOST PREVALENT FRACTURE SETS OBSERVED AT THE SITE BASED ON
TELEVIEWER LOGGING AT SITE -SPECIFIC BOREHOLES. THEY ARE SHOWN WITH APPROPRIATE
APPARENT DIP, WITH VERTICAL EXAGGERATION. THE ACTUAL NUMBER OF FRACTURES IS FAR Too
NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTHS AND LENGTHS OF
FRACTURES VERSUS DEPTH ARE CONCEPTUAL ONLY.
3. ALL BOUNDARIES ARE APPROXIMATE.
4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS.
GRAPHIC SCALE
0 350 700
HORIZONTAL SCALE: 1" = 700'
VERTICAL SCALE: 1" = 140'
5X VERTICAL EXAGGERATION
DRAWN BY: J. CHASTAIN DATE: 08/01/2019
REVISED BY: D. KREFSKI DATE: 12/11/2019
CHECKED BY: B. WILKER DATE: 12/11/2019
APPROVED BY: B. WILKER DATE: 12/11/2019
PROJECT MANAGER: B. WILKER DATE: 12/11/2019
www.synterracorp.com
FIGURE 6-3
GENERAL CROSS SECTION B-B'
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

C
(SOUTHWEST)
ASH BASIN COMPLIANCE
BOUNDARY
C'
(NORTHEAST)
rn p m ASH BASIN WASTE BOUNDARY ASH BASIN WASTE BOUNDARY
cq N ti
a ¢ ¢ DUKE
ENERGY
900 CAROLINAS BEND IN
PROPERTY <
LINE p co co CROSS SECTION 3 3 900
_ Q ¢ ¢ ¢ J CC C7 C7
877.37 J_ INNER W W W I U) N pN N o O O o O �4 0
TRANSITION _ _ __ __ _ _ _ _ _ _ _ _____ _ _ _ _ _ _ _ ASH m m m `� `� `� '� m m m m m 6 of
a __ ¢ ¢ ¢ m m m m ¢ ¢ ¢ ¢ ¢ ¢ ¢
ZONE----'-'�-----------ASH ----- BASIN SETTLING ¢ ¢ ¢ ¢
827.68 _
------ ROAD ASH _
_ - -----_ O ASH POND
800 _ ti -_ _ ____________________ _ ___
-__ 800
ASH PORE WATER = —
-866.49 - / / — \ \ / _ / / — \ _____________ _ _______ _ ___ASHP RE WATER _______ __-_ -_ ______ -___ ____ __________
/ ___ ___ 792.60- ��={ASH PORE WATER ------ __
'965.56, /T, - 1'I ♦ \ . / \ _ \ 'I / 845.94 = _ 790.71 = _ �= _ ' __ = _ 796.40 SAPROLITE
% / / ♦ / SAPROLITE - ---------------------- TRANSITION �'� ` / \ -
/1 \ \ /1 \/\ 1 \ \ /1 \ \ 1 \ _-- - 791.55 \ /1 \/\
.- .- - 1'/�.- - 1'/ - - \ /.- - 1'/ 1'/♦-_ 793.1A W-► �1.13= ZONE
- 1 807.30\ - 1'
\/ /\/I�\/♦/ . /�/\` I�\ �/� I/\/�/\/I�\ 825.40�/\/I�\ ♦ 792.23� I \ 791.1z /
_ / \ _ / _ / / , \ I, \li \ / I \/
♦/ \I/1\/ /\I ♦/ /\I �'\ I/1 �/�/\ 1♦,\/\I\I/1♦/\ I ♦/ 1 - ♦/ I `/- I \, I ♦/- ♦ 799. ./_- I �7_ ,--ram♦
\ ♦ \ - 1'/\ \ \ - 1 �/� , \ - 1'/\ ♦ - \/♦-/ \T_\ fit`/� , \ - 1'/\ ♦ //� '/\ \ //� O8�\ ♦ //. / '/\ \ \ / \ /\ ♦ \ \ _ \ \ _'/�-, _ \ ♦/
Z /700 4E
1,\i \ I fi♦/1, \\\� \/I/\i/\/I \\i ♦/1/\il� 823� ♦/I/\i \/I/\\i \/I�\ /I,\\i \/ /I,\\i ♦ 79` �/I,\\i /I /♦/I,\\i ♦ /\il♦/I,\\i /I/\il♦/I/\` Z
O / ♦/\/\I 1\/\I/1`BEDROCK/1\/\I/1\/\ \I/1�/\/\I/♦/\ \I/1�/\/\ 1♦/\ \I/1��\ /1 \ \I/1��\/\/1 \ \ 1��\/\/ \/1��\ 1 \ \/1��\ \/1 1.1 L/17/ /�f.-} \ \ 0_
_ / _ _ / _ / I \ / / I \ / / I I / / I I ♦ / / I I \ / I I \ / /
♦/ i l l \\/ - \ i \`/ i \ l l \\� I \ i \`/ i \l \ l \`� I \ i \\/ \ \ l lT/ — \ '\\BEDROCK, / /♦/ i l l \` I / \ i / \\/ I \ / \ / \`/ I ' \ i l \♦/ 1 , \/ 1 / \` I \ \ \ BEDROC/ \
_ _ _ _ _ I O _
i/1,/1,/1,/1,1, /\I/1 /1 \I/1;\/ /1♦\I/1;\/\I/ /\
LLI 600 - \-\'/--1'/- \ \'/--1'/- \ \'/-��-\'/- \ \'/--\'/--1'/- \-_\ /- \ \' \-1'/- \ \'/ \-\'/- \ \'/- \'/- \ 1' \-1'/- \ \ \-1'/ \ \' 600 Lu
\ i / , i \ \ i / , ♦ I / \ i \ / , ♦ 1 \ i / , \ I \ i / , \ I /\ i ♦ / ,
Lu
Lu
/1 / / \ \/1 \/\/ , \/\I/1 \/\ 1, \/\I/1 \ \/1, \/\/1 \/\/1, \/ I/1 \/\/1, \ \I/1 \/\ 1 /\I/1 \/
/ I, \/� I_\/� \T IT\/ \ I-\/� \ / I� \/� \ I-\/� \ / I� \/� \ -\/� \ / I� \/� \ I-\/� \ / I� \/� ♦ I-\/� \ / I� \/� \ I_\/� \ / I� \/�
/1♦'\ 1, \/\ /1 \ \ /1,� \/\ /1 \ \ /1, �\/\ /1 \/\ 1 �1/� /1 \ \ /1,/1, �\/\I/1♦ /\/\I 1,-500
�\/\I/1♦ / \/\I/1� �\/\I/1♦'\/\I/1��\/\I/ 1♦ / \/\I/1� �\/\I/ 1♦ /\/\
500
/I,\\�� 1/\�/`,I,\♦�� /1/\�/�/I/\`i� /1/\�/♦/1,\`i� / /\il\/I�\\��'`,/I/\il�/1,\`i� /I/\il♦/1/\`i� /I/\il\/1,\`i� /I/\il\/1,\\i� /I/\il�/I,\`i� /I/\il�/I,\`i
400 1400
LANDFILL #1
LL
STRUCTURAL
FGD RESIDUE
LANDFILL
NOTE:
CROSS SECTIONS ARE LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
I
CROSS SECTION LOCATION
LL
LEGEND
WELL IN SAPROLITE MATERIAL
SHALLOW FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
WELL IN TRANSITION ZONE
WELL IN BEDROCK
DEEP FLOW LAYER GROUNDWATER
NOTES
WELL WATER LEVEL ELEVATION
WELL IN ASH PORE WATER
1. WATER ELEVATIONS ARE FROM THE MAY 2019 GAUGING EVENT. NOTE ELEVATIONS WITHIN EACH
CLUSTER ARE MEASURED REFERENCED TO NORTH AMERICAN VERTICAL DATUM 1988.
ABANDONED WELL
BEDROCK FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENT THE GENERALIZED
GENERALIZED WATER TABLE
ORIENTATIONS OF THE TWO MOST PREVALENT FRACTURE SETS OBSERVED AT THE SITE BASED ON
TELEVIEWER LOGGING AT SITE -SPECIFIC BOREHOLES. THEY ARE SHOWN WITH APPROPRIATE
GENERALIZED GROUNDWATER
ASH PORE WATER FLOW LAYER
APPARENT DIP, WITH VERTICAL EXAGGERATION. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO
FLOW DIRECTION
WATER LEVEL ELEVATION
NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTHS AND LENGTHS OF
GENERALIZED ASH PORE WATER
FRACTURES VERSUS DEPTH ARE CONCEPTUAL ONLY.
FLOW DIRECTION
0
WELL SCREEN
3. ALL BOUNDARIES ARE APPROXIMATE.
PREDOMINANT BEDROCK
FRACTURE ORIENTATION
4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS.
-
ASH BASIN COMPLIANCE BOUNDARY
ASH
ASH BASIN WASTE BOUNDARY
ASH PORE WATER
SAPROLITE
TRANSITION ZONE
BEDROCK
WATER LEVEL ELEVATION - MAY 2019 (NAVD-88)
(LABEL COLORING BY FLOW ZONE)
DUKE
44�ENERGY
GENERALIZED VERTICAL
HYDRAULIC GRADIENT
CAROLINAS
16,
WnTena
0 350 700
HORIZONTAL SCALE: 1" = 700'
VERTICAL SCALE: 1" = 140'
5X VERTICAL EXAGGERATION
DRAWN BY: J. CHASTAIN DATE: 08/01/2019
REVISED BY: D. KREFSKI DATE: 12/11/2019
CHECKED BY: B. WILKER DATE: 12/11/2019
APPROVED BY: B. WILKER DATE: 12/11/2019
PROJECT MANAGER: B. WILKER DATE: 12/11/2019
www.synierracorp.com
FIGURE 6-4
GENERAL CROSS SECTION C-C'
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

SW NE
D D'
ASH BASIN COMPLIANCE
BOUNDARY
PHASEI UNNAMED
ASH BASIN ASH BASIN WASTE DRY ASH I TRIBUTARY
900 WASTE BOUNDARY LANDFILL I 900
BOUNDARY BOUNDARY
0 m
U
N N
m m< Q aACCESS o 0
Q ¢ U U - — ROAD
U U
800 - - _-- — -t — — — — 786.4: - -� S-1 0 � 800
-791.9- — --_ -------- - - _-_-_-_-_-- 787.54
-- _--__ -_- —ASH PORE WATER =_______ --- 780.91— — i — —
SAPROLITE
766.06 SAPROLITE IN /
SAPROLITE _
i / - / - _ \ \ / Z
700 �/\I/\�� /�I/1`�i O
TRANSITION ZONE / - \ - 1 ' / - / - \ ' / - \� - \ ' / - \ - \ \ - 1 ' / - / - \ ' / - 700
WL�IL\i\/\I/1\/\I/1�/\I/1\/\I/\\��/\I/1\/\I/\�/\I/\\/\I/1\/\I\\/\I/\���/\I/\\/\I/\�/\I/1 /\/\I/\/\I/1\/\I/\�/\I/\\/\\/\I/1\/\I/\/ W
W 1L�i/J i \lam \ I \/i \ / l i \lam \ I \/i \ \/i \ I \/i \ / l i \lam \ I \/i \ / l i \ i \ I \ i \ / l i \lam \ I \/i \ / I \/� \ I \/i \ / l i \lam \ I W
\
600 \ _ ♦ /I / \\' i / I \_� /I / `\' i / I \ /I / `\� i I \_� i I / \\� i / I \ /I 600
\/\I/\//�/\I/1`�\/\I/1,/�/\I/1`�\/\I/1//��BEDROCK /\I/ ,��/\I/1`�\/\I/I/
\/_♦��/I-\/'i /I�\_���/I-\/�i�/I�\�♦��/I-\/�i /I�\l I-\/I�\�♦��/I-\/�i /I�\/_�I \lI�\I-\/�i /I�\/_�I-\I�\I-\/I�\�♦��/I-\/�i
,�\ \I/1\/\I/1�/\I/1\/\I/1��
\BEDROCK \ -\'/ - \ \ 1'/ -
\/ j i \ i I \ i \/ I i \ i I \ i \/
500 /\/\I/1`�\/\I/1N\I/I\I/1`�\/\�/1/\r/1\I/\\I/I\/\I/\\I/1\�\I/I\/\I/\500
��
LEGEND
MW 12S WELL IN SAPROLITE MATERIAL SHALLOW FLOW LAYER GROUNDWATER
INDUSTRIAL MW-16D WELL IN TRANSITION ZONE WELL WATER LEVEL ELEVATION
LANDFILL 1#1
- MW 16BR WELL IN BEDROCK DEEP FLOW LAYER GROUNDWATER NOTES
WELL WATER LEVEL ELEVATION
ABMW-2 WELL IN ASH PORE WATER 1. WATER ELEVATIONS ARE FROM THE MAY 2019 GAUGING EVENT. NOTE ELEVATIONS WITHIN EACH
NON -CONSTRUCTED SEEP CLUSTER ARE MEASURED REFERENCED TO NORTH AMERICAN VERTICAL DATUM 1988.
S-1 MONITORED UNDER THE SPECIAL BEDROCK FLOW LAYER GROUNDWATER
ORDER BY CONSENT S17-009 (SOC) _v_ WELL WATER LEVEL ELEVATION 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENT THE GENERALIZED ORIENTATIONS
DRY ASH FROM CROSS SECTION C-C'. DEPTHS AND LENGTHS OF FRACTURES VERSUS DEPTHS ARE
LANDFILL • GENERALIZED WATER TABLE
m
ASH BASIN (PHASE II) GENERALIZED GROUNDWATER WATER LEVEL ELEVATION
ASH PORE WATER FLOW LAYER CONCEPTUAL ONLY.
—, FLOW DIRECTION 3. ALL BOUNDARIES ARE APPROXIMATE.
_► GENERALIZED ASH PORE WATER WELL SCREEN 4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING CONDITIONS.
FLOW DIRECTION
PREDOMINANT BEDROCK
PV STRUCTURAL FRACTURE ORIENTATION ASH BASIN COMPLIANCE BOUNDARY
FILL DRY ASH
LANDFILL ASH ASH BASIN WASTE BOUNDARY
(PHASE 1)
ASH PORE WATER
ASH BASIN
SAPROLITE
LAKE
NORMAN TRANSITION ZONE
GRAPHIC SCALE
FAD RESIDUE 1 BEDROCK DUKE 0 125 250
LANDFILL
WATER LEVEL ELEVATION - MAY 2019 (NAVD-88) HORIZONTAL SCALE: 1" = 250' FIGURE 6-5
823.96 VERTICAL SCALE: 1" = 100'
NOTE: (LABEL COLORING BY FLOW ZONE) ENERGY 2.5X VERTICAL EXAGGERATION
GENERAL CROSS SECTION D-D'
GENERALIZED VERTICAL CAROLINAS
HYDRAULIC GRADIENT DRAWN BY: J. CHASTAIN DATE:08/01/2019 CORRECTIVE ACTION PLAN UPDATE
CROSS SECTIONS ARE LINEAR IN NATURE AND ALL REVISED BY: D. KREFSKI DATE: 12/11/2019
LOCATIONS NOT ALONG THE CROSS SECTION ARE CHECKED BY: B. WILKER DATE: 12/11/2019 MARSHALL STEAM STATION
PROJECTED ONTO THE CROSS SECTION. APPROVED BY: B. WILKER DATE: 12/11/2019 TERRELL, NORTH CAROLINA
PROJECT MANAGER: B. WILKER DATE: 12/11/2019
CROSS SECTION LOCATION synTerra
www.synterracorp.com

PRE -DECANTING CONDITIONS , •
POST CLOSURE CONDITIONS•
FOR CLOSURE -IN -PLACE
,
s
1
1000
l
60
Jf
,
Vo
r A-1
��?4r�
�(O epj
i� *J/,
���;
�, '�: •�� 0{� {!mil{����- ;,,��,
•-,♦
� �, `�� �111{e /����,-
•
Al
•'♦•,
1f1�—lam=IR \�%%/%,� oo'�•,:�
glk/e,
er ,.
■ ,�� ♦
1 ,•'
_70 FEET
0FEET
•-'
• I • — . Ei ■ • _70 FEET
,•�-�-`• `� ♦'• - 0FEET
100,
l .r/� _ '��
� '��
LEGEND�I"-• 1
NOTES:
APPROXIMATE SATURATED STRUCTURAL FILL BOUNDARY
1SATURATED THICKNESS BASED ON CLOSURE MODEL RESULTS WITH UNDERDRAINS
ASH THICKNESS ISOPACH LANDFILL COMPLIANCE • .
DUKE
�' ENERGY®
600
GRAPHIC SCALE
0 600 1,200
FIGURE 6-6
SATURATED ASH THICKNESS MAP FOR
ASH BASIN WASTE BOUNDARY 2.ASHTHICKNESSISOPACHSURFACESFROMFLOWANDTRANSPORTMODELS(FALTAANDOTHERS,
2019)
BOUNDARY DUKE ENERGY CAROLINAS
ASH BASIN COMPLIANCE PROPERTY LINE 3. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
CAROLINAS
(IN FEET)
PRE -DECANTING AND POST -CLOSURE CONDITIONS
CORRECTIVE ACTION PLAN UPDATE
DRAWN BY: C.DAVIS DATE:11/08/2019
REVISED BY: C. DAVIS DATE: 12/12/2019
BOUNDARY 4 AERIAL PHOTOGRAPHY OBTAINED FROM ESRI ONLINE ON JUNE 10, 2019. AERIAL WAS COLLECTED
STREAM (MCKIM & CREED) ON FEBRUARY 6,2017.
'
CHECKED BY: E. WEBSTER DATE:12/12/2019
APPROVED BY: E.WEBSTER DATE:12/12/2019
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
LANDFILL BOUNDARY ® WETLAND (MCKIM & CREED) 5. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE COORDINATE
SYSTEM FIPS 3200 (NAD83).
synTerra
PROJECT MANAGER: B. WICKER
www.synterracori).com

A ll� A'
ASH BASIN WASTE POWER LINE
(NORTHWEST) BOUNDARY RNV ASH BASIN WASTE (SOUTHEAST)
BOUNDARY 900 + BEND IN DDAAMBASIN 900
a s m m m CROSS SECTION m m m m m o uJ n N "af3 J J
¢ ¢ ¢ a a a a
SAPROLITE FILL p1 a syra
_
FILL as a¢ 36f ASH oom m m m m m 0 U)
800 PO EWATER
_ � == aa�s ns sa I n a a ¢ ¢ ¢ a 3 3 800
=-_A_SH =-_-- - _
\ / ` / - i \ /(- —► _ .=-_�-�-___ ASH PORE WATER __________ a u
I \ , / \I ♦ / - I ♦ / SAPROLITE _ _ _ N.tsa _ _ LAKE NORMAN[I to _ _ _ _ _ _ _ _
TRANSITION s.a3 ___-- ---== E_ _____ ____________ __-_-_-_-_------_______-------_--_-_-_-_-_-_-- FILL EL. 760
ZONE te
�--
` / \ \I / 1 \ / / \I ` / \ / \I 1 / \ ` / \ / \I / 1 ♦ / \I \ \I / 1 / / \I x / 1 / \ \I / 1 ♦ / SAPROLITE
TRANSITION ae.to
� � ' /� - � � /\ - \ � - / �- /� - -_ - /\-- - /\- \ � ■a-90 ZONE
700 \/Ir\ �I!\/i/\ I/\/��\/1�\/i/\ I/\li /I/\il\/ s.1 I \/i a \/I/\/i/\/ /I/\/i \/I/ lil\/ \/ a na li n Sxxx il/ u \/(/\l 700
I/1`/\/ I/1\� /\I` /-�\I\/\`-\/I�/♦�_\ I./\�-\/I� ioa 1n \/ /-\ \ I\/\/- /\/♦�_\/I\/ - _ /I�/\ -cl 1.r _ I�/♦ - - ♦/- - - - ms-- -
/
I \\-
I/1\/\/\I/ ,�\/\I/1\�\/\I/1\/ /\I \ I \/— \ `/— I \/_ /\I/ ♦/ /\I 1♦/ /\I I/1\/ \/\I/1\/— \I \/_ /\I `/— I /— /_ / I \/
/\-- \ 1 /� \ - \ //� - \� 1 /` - u s.. - \� 1'/♦-- \ - \'/♦- \� 1'/♦- � - \� 1'/\-- //\-- \� a ai, - 1 �/`-- \� 1'/`-- - 1 //` - \� / n xa \� - 1 � / - 1 r
�600 \/I/\li \/ /\/il\/I/\l
Z 1/\li 600
\ /1 /\ \ \ /1 /\ \ \ /1 /\ /\ _ I / I \/ / I I` \/ / I ♦/ - ]3 I ♦/ I \/ I \/ I \ \/ I / / I ♦ I \/
Z
I ♦// �/ '\/I -\ / 'I \// -/ \/I -//\ //-\` '`I /\// �`/ '\ /-/` / \ '/I �/ ♦ -` /\ ' \//I \- /\ /-\ '/I �//♦ / -\ /\ ' \//I \- /-'/-\'\ \'/ //- _` \ �// \ -/ \ ♦m/�s . 1a1 - \ �// \- / \ ♦' / / /- -\ \'// \- / \ \'/ / /- -\ -/ \ \'/ /- ` '/ -\�/ / /- -
\ Q
ROCK\` F_F_ BEDI- I/ I \ / / \I ` / I \ / / \I ` / I ♦ / / \I ` /— I ♦ / / \I ` — I ♦ / — I / / I \ /
/
W rJ00 I i \l i l \\/ I / \ i/ \`/ (i \ l i l \\ I / \ i l \�/ (i \l i l \ / I / \ i l \\/ 1 i \ \ l - \ / i l �/ I i \ l I / \ \ l / i l i l \\/ I — 1 / i l i l \ I / \ i l \\/ I / \ / \ / \ I / \ i l \\ I \ \l i l ;♦- \ i/ \�/ I / \ l \ i/ \�/ I / \l i i/ \1% I / \ l 1 500 W
i \ / I / \ / / / / /
/ _ / _ _ / _ BEDROCK / \ I \ / _ /i \ I \ /\ / _ / / _ _
J I ♦ / / \I ♦ / - ` I \ / ` -� I ♦ / - ` /I / \ / - \ I / ♦ / - \ /I / ♦ / \ I / \ / - \ / \ / \ - I / \ / - `' \ / - _ \ \ / ` / \ / \ / - - ` / _ \ / \ / - - / _ \ / \ / - BEDROCK W
LILI
/ 1 \ / 1 , \ / \ / 1 \ \ / 1 \ / \ / 1 \ / \ / , \ / \ / 1 / \ / 1 , \ / \ I 1 \ / \ / 1 , \ \ I / 1 \ / \ / \ I / 1 , / \ I / 1 / \ / \ I / 1 ♦ L \ I / 1 \ \ / I / 1 \ / \ I / 1 \ / \ / \' / 1 \ / \ I / 1 \ / \ \ / \ I / 1 \ \ / \ I / 1 / \ / I / 1 / \
\
N
400 ` /1 \/ /I - \/ /1 /\� /I - i //1 \� \ /I - \�/\ i // \� ♦ /I - \l //1 \/ \ /I - \/ �', /I \/ ♦ /I - \/ //1 \� \ /I - \/ //1 \� \ /I - \/ /I \_ \ /I - \/ /� //I \� \ /LLC�'� i / I ! \l i I \/ //1 / \/_ 400
I/1`/\/\I/1�/\/\I/11 i�/\I/1�/\/\I/1\/\/\I/1�/\V\I/1♦/\/\I/1�/\/\I/1\/\/\I/1�/\/\I/1\/\/\1/1�/\/\I/1\/\/\I/1�/\/\1/1\/\/\I/1�/\/\I/1\/\/\1/1�/\/\I/1♦/\/\I/1�/\/\I/1\ \ \/\1/1\/\
I \ / I \ /— I \ / I ` /— I \ / I ` /— I \ / I ` /— I \ / I ` /— I \ / I ` /— I \ / I ` /— I \ / I
/ 1 / 1
300 ` / 1 / \i / 1 \/' / ` / 1 / \ i / 1 \/' / ` / 1 / \i / 1 \/' / \ / 1 / \i / 1 \/ / \ / 1 / \i / 1 \/ / ` / 1 / \ i / 1 \/ / ` / 1 / \i / 1 \/' / \ / 1 / \ i / 1 \/' / \ / 1 / \i / 1 \/ / ` / 1 / \ i / 1 \/ / ` / 1 / \i / 1 \/' / \ / 1 / \ 300
I ` ` \ / \ I / 1 , / \ / \ I / 1 \ � \ / \ I / 1 , � \ / \ I / 1 \ � \ / \ I / 1 , � \ / \ I / 1 ♦ � \ / \ I / 1 , � \ / \ I / 1 ♦ � \ / \ I / 1 � � \ / \ I / 1 \ � \ / \ I / 1 , � \ / \ I / 1 \ � \ / \ I / 1 � � \ / \ I / 1 \ � \ / \ I / 1 � � \ / \ I / 1 \ � \ / \ I / 1 � � \ / \ I / 1 ♦ � \ / \ I / 1 , � \ / \ I / 1 \ / \ / \ I / 1 , � \ / \ I / 1 \ / \
200 200
STRUCTURAL
RESIDUE
DFILL
NOTE:
LANDFILL #1
CROSS SECTIONS ARE LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
LEGEND
SHALLOW FLOW LAYER GROUNDWATER
AB JS
WELL IN SAPROLITE MATERIAL
WELL WATER LEVEL ELEVATION
`
AB 1D
WELL IN TRANSITION ZONE
DEEP FLOW LAYER GROUNDWATER
-�
AB 156E
WELL IN BEDROCK
WELL WATER LEVEL ELEVATION
AB 15S
BEDROCK FLOW LAYER GROUNDWATER
WELL IN ASH PORE WATER
WELL WATER LEVEL ELEVATION
_
AB 18D
ABANDONED WELL
ASH PORE WATER FLOW LAYER
•
WATER LEVEL ELEVATION
GENERALIZED WATER TABLE
— _ _ —
w *m
MEAN BORON (B) CONCENTRATION ((Ig/L)
—,
GENERALIZED GROUNDWATER
a oa
MEAN CHLORIDE (CI) CONCENTRATION (mg/L)
FLOW DIRECTION
c' LA
MEAN LITHIUM (Li) CONCENTRATION (ug/L)
—
—�
GENERALIZED ASH PORE WATER
` x3
MEAN TOTAL DISSOLVED SOLIDS (TDS)
FLOW DIRECTION
1OS
CONCENTRATION (mg/L)
DRY ASH
LANDFILL
_ _
PREDOMINANT BEDROCK
WELL SCREEN
(PHASE I)
FRACTURE ORIENTATION
ASH
ASH BASIN COMPLIANCE BOUNDARY
ASH PORE WATER
ASH BASIN WASTE BOUNDARY
LAKE
FILL
NORMAN
SAPROLITE
�.
TRANSITION ZONE
DUKE
40)
BEDROCK
ENERGY
SURFACE WATER
CAROLINAS
s mTerra
NOTES
1. WATER ELEVATIONS REPRESENT THE MAY, 2019 GAUGING EVENT
FOR EACH WELL. NOTE ELEVATIONS WITHIN EACH CLUSTER ARE
MEASURED IN THE SAME DAY. REFERENCED TO NORTH AMERICAN
VERTICAL DATUM 1988.
2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENT THE
GENERALIZED ORIENTATIONS OF THE PREVALENT FRACTURE SETS
OBSERVED AT THE SITE BASED ON TELEVIEWER LOGGING AT
SITE -SPECIFIC BOREHOLES. THEY ARE SHOWN WITH APPROPRIATE
APPARENT DIP, WITH VERTICAL EXAGGERATION. THIS CROSS SECTION
IS APPROXIMATELY PARALLEL TO THE PREDOMINANT FRACTURE
STRIKE DIRECTION. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO
NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTHS
AND LENGTHS OF FRACTURES VERSUS DEPTH ARE CONCEPTUAL
ONLY.
3. ALL BOUNDARIES ARE APPROXIMATE.
4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING
CONDITIONS.
GRAPHIC SCALE
0 350 700
HORIZONTAL SCALE: 1" = 700'
VERTICAL SCALE: 1" = 140'
5X VERTICAL EXAGGERATION
DRAWN BY: J. CHASTAIN DATE: 08/01/2019
REVISED BY: D. KREFSKI DATE: 12/24/2019
CHECKED BY: B. WILKER DATE: 12/24/2019
APPROVED BY: B. WILKER DATE: 12/24/2019
PROJECT MANAGER: B. WILKER DATE: 12/24/2019
www.synterracorp.com
COI NOTES:
1. ALL CONCENTRATIONS SHOWN ARE STATI STIC AL MEANS CALCULATED
BASED ON CENTRAL TENDANCY OF DATASET USING DATA RANGING
FROM JANUARY 201E TO MAY 2019.
2. BORON (S) AND LLT111 UM (u) CONCENTRATIONS ARE IN MICROGRAMS
PER LITER (pglL)•
3. CHLORIDE (C 1) AND TOTAL DTSSO LVED SOLIDS (TDS)
CONCENTRATIONS ARE IN MILLIGRAMS PER tI TER (mg/L).
4. WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID
RESULTS. THE MOST RECENT VALID SAMPLE DATA UP TO TUNE 2019 WAS
USED-
ANALYTI C AL PARAMETER B CI u TOS
REPORTING UNLTS "all. ma/I ua1L ma1L
15A NCAC 021, Standard
700 250 NE 500
Ha ckground Threshold Values
5O 5.0 4.8 152
(Shallow Flow Zone)'
Background Threshold Values
50 q 2 10 200
(Deep Flow Xo")'
Background Thm'I' ldValues
SD 3-6 11-4 i9s
(Bedrock Flew Zone]'
' - UPDATED BACKGROUND THRESHOLD VALUES (BTVS) WERE
CALCULATED USING DATA FROM BACKGROUND GRDUN DWATER SAMPLES
COLLECTED FEBRUARY 2010 TO DEC EMBER 2018,
FIGURE 6-7a
GENERAL CROSS SECTION A -A'
CONSERVATIVE GROUP
MEAN OF BORON, CHLORIDE, LITHIUM,
TOTAL DISSOLVED SOLIDS
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

A 111. A'
ASH BASIN WASTE POWER LINE
(NORTHWEST) BOUNDARY RAW ASH BASIN WASTE (SOUTHEAST)
BOUNDARY 900 ASH BASIN 900
00 ro p BEND IN LO a LO DAM
a s m m m CROSS SECTION m m m m
QQQ Q Q a Q m�cJwvN mow ��
SAPROLITE FILL 6 6cb �-u31 m o3 o w m m
m
FILL Q Q Q Q
_ m w
ASH
800---------�---------=------===== - = -
_ __ASH PO E w Q Q Q a Q Q ��
WA
---- 3 3
TE ------
800
\ I -
\ ____ ____ ___ '�____��_________________ Sr n LAKENORMAN
.760
I/ 1 i / \ / \1/ 1 / / \ \1/ 1 /_ SAPROLITE & ___ ___=_ASH PORE WATER______ ___ ________ ________ n ea• -_- ____ EL. 760
_ TRANSITION _ _______ _____ __ __ ______ _ _ _ FILL
ZONE =_______ _R_=__- ____________
--__ a. fa[ -___________=_==_ASH PORE
\, \ / \I ♦ /— 1 TI eu \ \1 \ / \ SAPROLITE �► ----- �a
/ \ \ 1 / 1 / / \ / 1 \ o TRANSITION
700 / \ i / \ 700
1 N.
\/1/\1 /\I \/\
/ / 1 /
\ - ♦ -
,/,/\\i/\i \/
\/\1/1, \/\ 1�� 1/ \/\1/1�/\/\1/ , \/\1/ _ 1, \/\1/1� \. /1/_\ \/\/1, \ ♦1/1�/\/\1 1, \/\1/1� _ / \/♦/1//\/ - /"N,
\I/IN-
1�/\
v600— \l ./I!\/il\/,,\li \/1!\lil. \ I�\l.l./,,\T7/T _�/,,\li ./I!\/il\/,,\li /I!\, \li ./1!\lil./I/\1c� %�_l,/,, I!\/il / ,\li \/I \,il./I�\l 600
\/\1/1` /\ I \/ I / I \/ I \/- I \/
Z /1 / \ /1 \/\/1, \/� /1 \ \/1, \/� /1 \/\/1, /\/1 \/� /1\/\/1 \/\/ /�\/\/1 \/\ 1/�\ \/\/1/�\/ /1 \/\/ /\ Z
,�/BEDROCK\`�/ /I/\il\\/,..-\\si/1L\il\\/ \\il\/I/\ l,�/,,\\il\/I \i/\\/I/\\�/\/I \i/\\/I�\\�/♦ I/ -/ , �\/I/ -/ \/ / \i/\/I \il �/ , \ �l
\ i , /T \ i , I \ \ I \ \ I \ \ I \
'NN
N.
/,/.I\I/1\;/—\/\/.I/1;/,/.I,1`/\/\I,1;/,/.I/1\/ /\I/1;/,/\I ,`/\/\I,\/\
+, _,
W 500 /\--\-\//`/-��1'/\--\-\//` -��1�/\--\-\///-��\�/� \-\//`/-��1/ \-_\-1�/\� \�/�-\-\�/\�-\-1�/\--\-1�/\�-\-\�/� _\-1�/\�--\�/\ _\-1�/\�-i \�/\--\-\�/\- -1 / T '/ \-1 NN
/ 1' \/� \ /I - \/� / 1 \,� \ I -\/� i / 1' \/� /1 - \/� / I \ \ /1 _ \/� / / 1 / BEDROCK /I - \/ i / I' \/� \ /I _ l� i / 1 / \/� \ /I \l' i / 1' \lN
\ /1 _ \/i I / 1/i \ /I _ i / I \l \/i / 1 \/� \ /I _ \/� I \/ 500 W
_\ \ / - _\ \ \ / - _\ _\ \ / - \ _\ \ / - _ _\ \ / - _\ \ \ / - _\ _\ \ / - - _\ \ / - BEDROCK \ -
J \1/1\/\/\1/ 1�/\1/ 1`/\/\1/ \/\/\1/1\/\1/1\/\/\1 1`/\/\1/1`/\\1/1/\1/1`/\/\1/1\ /\1/1`/\/1\/ /\1/1\/1/\1 \/ / W
. / _ \ . / _ \ . / \ . / \ \ / \ \ / \ . _
,\�-IAr/\/,�\\��\/I \\ ,l\\ I/\\�/(\/I�\\�,/\\�,/\\\�,/\\/I \`�\ice\/I \i/\�/`�jl,\\
/\1/1`/\/\1/1 /\1 ♦ / / 1 I\/ /\I \ / /\I I ♦ / /\I I ♦ / /\I�, I ♦ / /\I I ♦ / /\I I ♦ / /\I I \ / -
/ \ /1 \ / 1, \/♦ /1 \ /1, \/♦ / 1 \ /1, \/♦ / 1 \ /1, �/♦ /1 \ 1, \/\ /1 \ /1, \/♦ /1 \ /1, \/♦ /1 \ /1, �\/♦ 1 \
400 /1�\/ /I-\/�i\/�/\, /I-\/ i\/I�\l /1-\"\�i /\/��\/I-\/�i /1'\/_��\/I-\/��� I�\, /I-\/_�i /1'\/��\/1-\/_�i /1'\/���/1-\,ii /1/\i�i\,I-\/i �\/1�\lii"L_C/� /,i \,i� /I�\l 400
\ \/- _♦ _\ \/- \ _-` I /`/ /\1/1 /\I\/\�-/\1/1\/_ /\,\/`�_/\1/1\/_ /\,\/\�-/\1/1\/ /\I\/\�-/\1/1�/\\/\1/1\ [ew.0 \/\1/1`/\
111/\1/1�/\/\1/1`/\/\1/1�/\/\1/1\/\/\1/1�/\/\1/1`/\/\1/1\/ /\ \/
1 / 1 / / \ 1 / 1 ` / \ / \ 1 / 1 / / \ 1 / 1 ` / \ / \ 1 / 1 / / \ 1 / 1 ` / \ / \ 1 / 1 / / \ 1 / 1 ` / \ / \ 1 / 1 / / \ 1 / 1 ` / \ / \ 1 / 1 / / \ 1 / 1 ` / \ / \ 1 / IN/1 / / \ 1 / 1 ` / \ / \ 1 / 1 / / \ 1 / 1 ` / \ / \ 1 / 1 / / \ 1 / 1 \ / \ / \ 1 / 1 / /
/ / / / / / / / / /
300 ` / 1 ' \l i \ /I - \lam i / 1' \\ /I -\/� i / 1' \/1 - \/� i / 1 / \/� \ /1 - \/� i / 1' \/� \ /I - \/� i / 1' \,� \ /I - \/� i / 1 / \/� \ /1 - \/� i / 1' \/� /1 - \/� i / 1 / \/� \ /I - \/� i / 1' \/� /I -\/� i / 1 \\ /I - \/� i / 1 ' \l 300
I \ / \ _ \ , ` / - \ I \ /\ _ \ I ` / - \ I \ /` _ \ I \ / - \ I \ / \ _ \ I \ / - \ I \ / \ _ \ I ` , - \ I \ / \ _ \ I ` , - \ I \ / \ _ \ I \ / - \ I \ / ` _ \ I \ / - \ I \ / \ _ \ I ` , - \ I \ / \ _ \ I \ , - \ I \ \ / _ \ I \ / - \ I \ / `
1/N, / 1 / \ /� / 1 \ / \ / 1 / \ /N, /N, / 1 \ /� / 1 / \ /� / 1 \ /N,
200 COI NOTES:
LEGEND NOTES 1. ALL C ON C ENTR AT] ON 5 SHOW N AR E 5TATI STI C AL MEAN5
CALCULATED BASED ON CENTRAL TENDANCY OF DATASET
SHALLOW FLOW LAYER GROUNDWATER USING DATA RANGING FROM 3ANVARY 2016 TO MAY 2019-
AB 9S WELL IN SAPROLITE MATERIAL � WELL WATER LEVEL ELEVATION 1. WATER ELEVATIONS REPRESENT THE MAY, 2019 GAUGING 2 STRONTIUM (Sr) AND THALLIUM (TI) ARE IN MICROGRAMS
EVENT FOR EACH WELL. NOTE ELEVATIONS WITHIN EACH
INDUSTRIAL PER LITER (Ng1L).
LANDFILL #1 � � CLUSTER ARE MEASURED IN THE SAME DAY. REFERENCED
4 AB 1D WELL IN TRANSITION ZONE DEEP FLOW LAYER GROUNDWATER TO NORTH AMERICAN VERTICAL DATUM 1988. 33-TOTTAL RADIUM CONCENTRATIONS ARE IN PICOCDRIES PER LITER OF
AB-15BR WELL IN BEDROCK _v_ WELL WATER LEVEL ELEVATION 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENT
THE GENERALIZED ORIENTATIONS OF THE PREVALENT 4" WELLS WITH OATASETS CONTAINING FEWER THAN FOUR
AB 15S LID RESULTS, THE MOST RECENT VALID SAMPLE DATA VP
WELL IN ASH PORE WATER FRACTURE SETS OBSERVED AT THE SITE BASED ON TO ]UHE
BEDROCK FLOW LAYER GROUNDWATER TELEVIEWER LOGGING AT SITE -SPECIFIC BOREHOLES. THEY TO A A WAS USED.
AB 18D ABANDONED WELL WELL WATER LEVEL ELEVATION ARE SHOWN WITH APPROPRIATE APPARENT DIP, WITH ND DATA AVAILABLE
DRY ASH VERTICAL EXAGGERATION. THIS CROSS SECTION IS LANDFILL . ASH PORE WATER FLOW LAYER APPROXIMATELY PARALLEL TO THE PREDOMINANT FRACTURE ANA LYY[C AL PARAMETER Sr TT Ra
GENERALIZED WATER TABLE
[ (PHASE II) _v_ WATER LEVEL ELEVATION STRIKE DIRECTION. THE ACTUAL NUMBER OF FRACTURES IS REPORTING UNITS
FAR TOO NUMEROUS TO ILLUSTRATE AT THIS SCALE IN PgA Pg/L POOL
-jo. GENERALIZED GROUNDWATER
FLOW DIRECTION
-► GENERALIZED ASH PORE WATER
FLOW DIRECTION
ie°',
PREDOMINANT BEDROCK
PV STRUCTURAL DRY ASH
FRACTURE ORIENTATION
FILL LANDFILL
(PHASE 1)
---
ASH
ASH BASIN
ASH PORE WATER
FILL
LAKE
NORMAN
SAPROLITE
FGD RESIDUE
LANDFILL
TRANSITION ZONE
BEDROCK
NOTE:
SURFACE WATER
CROSS SECTIONS ARE LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
ADDITION, THE DEPTHS AND LENGTHS OF FRACTURES
MEAN STRONTIUM (Sr) CONCENTRATION (pg/L) VERSUS DEPTH ARE CONCEPTUAL ONLY.
MEAN THALLIUM (TI) CONCENTRATION (pg/L) 3. ALL BOUNDARIES ARE APPROXIMATE.
MEAN TOTAL RADIUM (Ra) CONCENTRATION (pCi/L)
4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING
CONDITIONS.
WELL SCREEN
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN WASTE BOUNDARY
('DUKE
�' ENERGY
CAROLINAS
16,
synTero
GRAPHIC SCALE
0 350 700
HORIZONTAL SCALE: 1" = 700'
VERTICAL SCALE: 1" = 140'
5X VERTICAL EXAGGERATION
DRAWN BY: J. CHASTAIN DATE: 08/01/2019
REVISED BY: D. KREFSKI DATE: 12/24/2019
CHECKED BY: B. WILKER DATE: 12/24/2019
APPROVED BY: B. WILKER DATE: 12/24/2019
PROJECT MANAGER: B. WILKER DATE: 12/24/2019
www.synterracorp.com
15A NC AC 02L smnda rd
HE
0.21
5^
Background Threshold values
(Shallow Flow Zoneyl
2!0
0.2
5.33
Back gro[ dThra shold values
(Deep Flow Zone)1
727
0-1
7.46
Badk gro, d Thra sh old Valdes
(Bedrock Flow Zane}[
313
0.2
6.43
I • UPDATED 8AC KG ROUND THRESHOLD VALUES (6 Ns) WERE
CALCULATED USING DATA Ili OM B AC K G RO LIN❑
GROUNDWATER SAMPLES COLLECTED FEB RUARY 2010 TO
DECEM13ER 2018.
- I NTER IM MAX [MUM A LLO W A8 LE C ONC ENTRATIO N (I MAC)
OF THE ISA NC AC 02L STANDARD, APPENDIX 1, APR IL 1, 2013,
A • FEDERAL MAXIMUM CONTAMIN AN7 LEVEL -
FIGURE 6-7b
GENERAL CROSS SECTION A -A'
NON -CONSERVATIVE GROUP
MEAN OF STRONTIUM, THALLIUM, TOTAL RADIUM
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

A �► A'
ASH BASIN WASTE POWER LINE
(NORTHWEST) NV BOUNDARY RASH BASIN WASTE (SOUTHEAST)
BOUNDARY 900 N ASH BASIN 900
ro BEND INLo m Lo Lo DAM
a s m m m CROSS SECTION m m m m
Q Q Q Q Q Q
SAPROLITE FILL p� rn rn �•
FILL m m m m ¢ G G ��
¢ ¢ ¢ ¢
ahmmmmmmo
_-��.-_� _�_ ASH ti
800 ` I ________ ________ ________ASH PO EWATER=___________ _ 800
__--__________ e u
i �► ____ ____ _]•____ _ _ _________________ LAKE NORMAN
I ♦ / \ / \I/ 1 " I ` / SAPROLITE _ _____=_ASH PORE WATER_ ____iE- - ___________ r' "uEL. 760
FILL
_ ______
341
TRANSITION - - ---
/ —\ \ — \ '♦ / \ — 1 ' —\ \ / _ ZONE — ♦ / ________ ____ -ASH PORE WATER _
�'/I \_ \ �`� /I / \♦ i \'/I \\ \ _ / — — `� ` /I \\ i`� / \i \\ / / \♦ 'i / — — \ /I — \♦ i / ___ / ♦ _____ _________ _______
/1"\/\I/1/ \/\I/1 \I/1"\ \I/1" /\I /1` /\ \I/1" SAPROLITE �► •_
\ \ / 1 \ TRANSITION
/♦-- \ — 1 /♦ — \ \ yvj �,II //./—1/1 I"i —/ / \—\\\— � \//\ /\� '` II \//�' 1/ Ii, --/ ce�\ \\\ i//\ l\\i � II /.// 1/1 I� —� /' \\\\— � //\\ //\\� ''` I ``//�/ 1/1 — I�, --_/ ��\ \\\ i1//\ l\\i � II /./—/—/1— I\� \/_ \—\\\_ i 1\//\ /l\\� ''♦ II `//./ 1/1— I�/ —_/ ��\\\ 1//\ \\ /\I ♦\/—/ 1/, I\ - /r. _\ /\uIt / /— I�/ —_/ '�� \\\— 1// ♦ l\� I \/.—/—/1 �—/ ' --\\— i \\//\ � l\\� //\ II ♦//�� 1/ — I\// --_/ \'�� \\�— 1// \ /\\� /\ II ♦\//—/—1— ♦a \/ _\ \n\aoss`/�''I-��/./ /1— j i, —_/ ce�\\\— //\ ' /\\i /\ I ♦/--1— � ' _\ \1/ %/\i /' II `\//.�//11' `i, —_/ \ —\\♦— / i \� —" _ —\\\_ — 1//\ % /\\� /I\//./1/1 ' `/, —_/ �\\\— /\ /\\i II \//.—1/1 \�— // —♦\\— — 1//\ /\\' ' II �/�/ 1/1 / \/, —_'�� \\�Z-- -O// \N/E\\� II \//�—1�1 ♦� _ / \\ — / `/ //, —_ �\\�— / \ \\ I //� 11 ,— '' —\\\— — /1\ � /\ /I 1` \�— \a//\rx / \\� II \//�/1/1
—
1 7007001 \6U0 600 v(
__—\'I` ♦.—�.'.�" —��,. /\� _\�I, / / —\il. /♦ � _\�I, ♦ / —\il. /\�—�\I\ �" —�\ 11 _\'I• •" _\'I. /♦� _\ I, ♦ / —♦il. /\ � \, —\ I �—\�I� /, _\�I. ,\� _
Z
Z / 1 / \ / 1 \ / \ / 1 , \ / \ / 1 \ \ / 1 , \ / \ / 1 \ , / 1 \ / \ / 1 \ / \ / 1 \ / \ / , \ / \ / 1 \ / \ / 1 \ / \ / 1 , \ / / 1 \ / \ / / \ \ \ / 1 / \ \ / \ / 1 / \
_ /�_ /�_ /�_ /�_ /�_ /�_ / /�_ _ /�\ /1, _ /�\ 1, / \ /1,�\
/BEDROCK
\`� /� / I / \ i / \ / FL\\l i/ 1L\ i / \\/ \\i l ♦ / I / \ l \\/ , / \\i l \ / I \ i l ♦ / , / \\i l \ / I \ i l ♦ / , / \\i l ♦ I / \ i l \\/`T — l / / — l \ \\— l ' — l \ \\ i l ♦ I \\ l \\ I \\
LI.I 500 /♦-- // /♦-- /1 /♦-- /' / 1 /♦— /� — 1 / ♦/♦--%'♦� —%'♦� — 1 /♦ — \ — 1 /�/ \ /♦-- \ \ /� — 1 \ — 1 G i
/,/\li \ I_\/i \/,/\li \ I_\/i ♦/,/\li ♦ I_\/i \/,/\i ♦ I_\li /I/BEDROCK I_\/ \/,/\/i \ I_/i ♦/,/\/i \ I \/i \/,/\l \ I_\/i \ I/t/i ♦ I i ♦/I/\l _\li ♦/I \li ♦ ;_a�lil/\l 500 W
J I�/♦/—♦ I�/\�_\�I� ♦,—\il�/\�_\�I�/`/—\il�/\� \�I�/`/—\il�/\�_ I�/♦, _\�I�/♦�_\�I�/♦/ \il�/\�_\�I�/`—\il�/\�_ �I�/`/—\il�/\BEDROCK/♦� \ice/— _\,` \/_\ice _\��/♦/—`' / — J
/\/1 /\ \/\/1 /\ \/\/ /\ \/\/1 /\ \/\/1 \ \/\/1 /\ \/\/1 /\ \/ /1 /\ \/\'/1 /\I \/\/\/ /\I ` \/\I/1 / t\ \'\ W
1JJ / 1 \ i \ / 1 \ / 1 / �\ / 1 / �\ 1 i �\ / 1 i / 1 _ L� / 1 i \ / 1 _ / �\ / 1 i �\ / 1 / \ / 1
, / , / \\i \ / I / \ i l ♦ I / \\i \ �I rl \ / , / \\i ♦ / I \ i l \ / I / \\ ♦ / I / \ i l \ I / \\i \ / I / \ i ♦ / , / \\i \ / I / \ / ` / , / \\i ♦ / I / \ i / \ / I / \\� / I / — / / \� \ / I /T / / \i \AN
1" \
_ / _/ _ / _/ _ _ / _/ _ _/ _ / _/ _ / _/ _ / _/ _ / aC _/ _ / _/ _ / _/ _ /
400 `\' I \/ I \l' i♦`' l i``'i`\'��i`\' I ' \l /I \/' i♦ I' \/ \ I \/_' i♦`'i`\'�\\/ ♦'L__♦`' / `\' I' `' 400
/1\'\/\I/1�'/\I/1" \/\I/1�' \/\I/1"\/\I/1�' \/\I/1" \/\I/1�'\/\I/1\'\/\I/1�' \/\I/1" \/\I/1�' \/\I/1"\/\I/1�' \/\I/1" \/\I/1�'
I / 1 \ / \ / \ / 1 , \ / \ I / 1 " \ / \ / 1 , \ / \ I / 1 ` ' \ / \ / 1 , \ / \ I / 1 ` ' \ / \ / 1 , \ / \ I / 1 " \ / \ / 1 , \ / \ I / 1 ` ' \ / \ / 1 , \ / \ I / 1 ` ' \ / \ / 1 , \ / \ I / 1 " \ / \ / 1 , \ / \ I / 1 " \ / \ / 1 , \ / \ I / 1 ` ' \ / \ / 1 , \ / \ I / 1 ` ' \ / \ / 1 / \ I ♦ /
200 200
STRUCTURAL
RESIDUE
NOTE:
fl• INDUSTRIAL
f LANDFILL #1 v
I �
DRY ASH
LANDFILL
(PHASE II)
3ASIN
DRY ASH
LANDFILL
CROSS SECTIONS ARE LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
LEGEND
AB-9S
AB-1D
AB-15BR
AB-15S
AB-18D
�mmm:L�
WELL IN SAPROLITE MATERIAL
WELL IN TRANSITION ZONE
WELL IN BEDROCK
WELL IN ASH PORE WATER
ABANDONED WELL
GENERALIZED WATER TABLE
GENERALIZED GROUNDWATER
FLOW DIRECTION
GENERALIZED ASH PORE WATER
FLOW DIRECTION
PREDOMINANT BEDROCK
FRACTURE ORIENTATION
ASH
ASH PORE WATER
FILL
SAPROLITE
TRANSITION ZONE
BEDROCK
SURFACE WATER
SHALLOW FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
DEEP FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
BEDROCK FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
ASH PORE WATER FLOW LAYER
WATER LEVEL ELEVATION
MEAN COBALT (Co) CONCENTRATION (ug/L)
MEAN IRON (Fe) CONCENTRATION (ug/L)
MEAN MANGANESE (Mn) CONCENTRATION ((lg/L)
WELL SCREEN
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN WASTE BOUNDARY
DUKE
�' ENERGY
CAROLINAS
16,
synTerra
C01 (VOTES:
1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEMS
NOTES
CALCULATED BASED ON CENTRAL TE NDANCY OF DATASET
US] NO DATA RANGING FROM ]AN UARY 2018 TO MAY 2019,
1. WATER ELEVATIONS REPRESENT THE MAY, 2019 GAUGING
EVENT FOR EACH WELL. NOTE ELEVATIONS WITHIN EACH
x. COBALT (Co), IRON (Fe), AND MANGANESE {Mnl
CLUSTER ARE MEASURED IN THE SAME DAY. REFERENCED
CONCENTRATIONS ARE IN MICROGRAMS PER LITER {119I1.}.
TO NORTH AMERICAN VERTICAL DATUM 1988.
3- WELLS WITH DATASETS CONTAINING FEWER THAN FOUR
VALID RESULTS, THE MOST REC ENT VALID SAMPLE DATA UP
2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENT
TO JUNE 2019 WAS USED.
THE GENERALIZED ORIENTATIONS OF THE PREVALENT
FRACTURE SETS OBSERVED AT THE SITE BASED ON
ANALYTICAL PARAMETER Co Fe Mn
TELEVIEWER LOGGING AT SITE -SPECIFIC BOREHOLES. THEY
ARE SHOWN WITH APPROPRIATE APPARENT DIP, WITH
REPORTING UNITS ,,,g/L VWL PWL
VERTICAL EXAGGERATION. THIS CROSS SECTION IS
APPROXIMATELY PARALLEL TO THE PREDOMINANT FRACTURE
STRIKE DIRECTION. THE ACTUAL NUMBER OF FRACTURES IS
FAR TOO NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN
ADDITION, THE DEPTHS AND LENGTHS OF FRACTURES
VERSUS DEPTH ARE CONCEPTUAL ONLY.
3. ALL BOUNDARIES ARE APPROXIMATE.
4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING
CONDITIONS.
GRAPHIC SCALE
0 350 700
HORIZONTAL SCALE: 1" = 700'
VERTICAL SCALE: 1" = 140'
5X VERTICAL EXAGGERATION
DRAWN BY: J. CHASTAIN DATE: 08/01/2019
REVISED BY: D. KREFSKI DATE: 12/24/2019
CHECKED BY: B. WILKER DATE: 12/24/2019
APPROVED BY: B. WILKER DATE: 12/24/2019
PROJECT MANAGER: B. WILKER DATE: 12/24/2019
www.synterracorp.com
15A NCAC 02L Standard
1• 300 s0
Background Threshold values
S.0 1095 155
(Shel low Flow Zane)'
Background Threshold Values
3-2 225 142
(Deep Row Zone) 1
Background Threshold Values
41.6 1220 330
(Bedrock Now Zone) 1
-UPDATED BACKGROUND THRESHOLD
VALUES f BTVGI WERE
CALCULATED LIST NO DATA FROM SAC KO ROUND
GROUNDWATER SAMPLES COLLECTED FEBRUARY 2010 TO
DECEMBER 2018,
_ - INTERIM MAXI MUM ALLOWABLE CONCENTRATION (IMAC)
OF THE ISA NCAC 02L STANDARD, APPENDIX 1, APR]L 1, 2013.
FIGURE 6-7c
GENERAL CROSS SECTION A -A'
VARIABLE GROUP
MEANS OF COBALT, IRON, MANGANESE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

V
CCR-14S
AB-8S
AMS
CCR-12S
AB-21 S
CCR-11 S
ASH BASIN
DRYASH
LANDFILL
(PHASE II)
AB-10S/SL
AB-12S/SL
SG-4
BORROW
AREA
DUKE
ENERGY
CAROLINAS
m
LEGEND
• TRANSDUCER LOCATION
❑ GEOCHEMICAL SONDE LOCATION
ASH BASIN WASTE BOUNDARY
LANDFILL BOUNDARY
STRUCTURAL FILL BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
LANDFILL COMPLIANCE BOUNDARY
- - DUKE ENERGY CAROLINAS PROPERTY LINE
310- STREAM (MCKIM & CREED)
WETLAND (MCKIM & CREED)
NOTES:
1. * - TRANSDUCER HAS BEEN REMOVED DUE TO SITE OPERATIONS.
2. WELL LOCATIONS WERE DERIVED FROM VARIOUS SOURCES AND ARE A MIX OF
SURVEYED AND APPROXIMATE LOCATIONS. THEREFORE, WELL LOCATIONS ARE TO
;. BE DEEMED APPROXIMATE.
3. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US
i0'
ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT
TO BE USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND
•
DELINEATION CONDUCTED BY MCKIM & CREED MARCH 2O16.
4. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
5. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON SEPTEMBER 12,
• ,.
2017. AERIAL WAS COLLECTED ON OCTOBER 8, 2016.
6. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83).
GDRAPHICSCA4LLED
FIGURE 6-8
490 ssD
ASH BASIN DECANTING
(IN FEET)
MONITORING NETWORK
DRAWNBY:A. ROBINSON DATE:
CORRECTIVE ACTION PLAN UPDATE
12/27/2019
REVISED BY: C. DAVIS DATE: 12/27/2019
CHECKED BY: E. WEBSTER DATE: 12/27/2019
MARS HALL STEAM STATION
APPROVED BY: B. WILKER DATE: 12/27/2019
PROJECT MANAGER: B. WILKER
TERRELL, NORTH CAROLINA
www.synterracorp.com

MW-7S
CCR-13S
5/1/2019 6/1/2019 7/1/2019 8/1/2019
9/1/2019 10/1/2019
5/1/2019 6/1/2019 7/1/2019 8/1/2019 9/1/2019 10/1/2019
7.0
5.0
4.8
6.8
4.6
6.6
2
=
a
a
4.4
6.4
4.2
6.2
4.0
350
6.0
125
300
0
250,E
E
-125 E
a
a
�
a
2000
O
-250
150
-375
100
-500
1040
1140
U1020
U1120
cn
m
z
z
'1000
W
V
7
U
7
'C
C
'C
c
U
U1080
w 980
w
'V
'U
1060
960
1040
771
5
5
788
0 770
G
4
Go
4
c
a 769
..
o
a 786
3 :,
?
,.
3
768
c
M
f6
4-0
784
c
a>i
u' 767
2 R
°C
>
w
2 ra
Gl
1
> 782
1
L 766
�
L
3 765
0
3
780
0
5/1 /2019 6/1/2019 7/1/2019 8/1/2019
9/1/2019 10/1 /2019
05/01 /19 06/01 /19 07/01 /19 08/01 /19 09/01 /19 10/01 /19
Date
Date
MW-7S: Shallow flow zone monitoring well located within the
CCR-13S: Deep flow zone well located downgradient of the ash
LEGEND
Notes:
NAVD 88 - North American
' DUKE
DRAWN BY: D. AVARD DATE:
10/31/2019
Vertical Datum
in - inches
ENERGY-
CARO!'
REVISED BY: E. WEBSTER
FIGURE 6-9
GEOCHEMICAL WATER QUALITY
pH (S.U.)
Oxidation Reduction Potential (ORP) (mV)
pS/cm - micro Siemens
per centimeter
CHECKED BY: E. WEBSTER
PLOTS
Specific Conductivity (µS/cm)
-
CORRECTIVE ACTION PLAN UPDATE
Gravity Flow Decanting Start (07/16/2019)
Mechanical Decanting Start (09/13/2019)
my millivolts
SU - standard unit
0
APPROVED BY: E. WEBSTER
MARSHALL STEAM STATION
TERRELL, NC
E--1 Daily Total (inches)
PROJECT MANAGER:B. WILKER
synTerra
www.synterracorp.com

AB-10 Cluster
AB-12 Cluster
AB-21S
794 5
793 5
793
5
00 793
4
792
4
0000 792
4
G
C
a
a
a
Z 792
Z�
Z 791
0
r
3E
..
2791
r
3E-
..
0
3
a2 791
c
�
790
I�
C
2
y
>
2 W
—y 790
>
2
@
>
2 W
W 790
J
W 789
L
L
L
M
789
1
3 789
1
3 788
1
788
0
788 0
787 0
05/01/19 06/01/19 07/01/19 08/01/19 09/01/19 10/01/19
05/01/19 06/01/19 07/01/19 08/01/19 09/01/19 10/01/19
05/01/19 06/01/19 07/01/19 08/01/19 09/01/19 10/01/19
Date
Date
Date
AB-10S Water Elevation (NAVD 88)
AB-12S Water Elevation (NAVD 88)
AB-21 S Water Elevation (NAVD 88)
AB- 10SL Water Elevation (NAVD 88)
AB-12SL Water Elevation (NAVD 88)
A13-2S
AB-4 Cluster
AL -IS
772 5
765
5
795
5
00
00 764
4
00
00 794
G
4
00
00 771
C
4
Q
Q
Q
Z
Z
Z
763
,�
793
,�
770
0
wi�hy
3 �_-,
2
3'z'
0
3
y 762
=
y 792
> 769
W
W
W
ra
d
2 W
2W
d
2 W
>
761
>
791
>
768
L
L
L
760
1
N
3 790
1
4
3 767
I3
I
1
766
0
759 0
789 0
05/01/19 06/01/19 07/01/19 08/01/19 09/01/19 10/01/19
05/01/19 06/01/19 07/01/19 08/01/19 09/01/19 10/01/19
05/01/19 06/01/19 07/01/19 08/01/19 09/01/19 10/01/19
Date
Date
Date
AB-2S Water Elevation (NAVD 88)
AB-4S Water Elevation (NAVD 88)
AL-1S Water Elevation (NAVD 88)
AB-4SL Water Elevation (NAVD 88)
LEGEND Notes:
i DUKE
DRAWN BY: D.AVARD DATE:11/05/2019
Ash Pore Water NAVD 88 - North
ENERGY.
REVISED BY: E. WEBSTER
FIGURE 6-10a
Gravity Flow Decanting Start (07/16/2019) American Vertical
Lower Ash Pore Water
CAROLINAS
HYDROGRAPHS — ASH BASIN AND VICINITY
Datum 1988
Mechanical Decanting Start (09/13/2019) Shallow Flow Zone in -inches
CHECKED BY: E. WEBSTER
CORRECTIVE ACTION PLAN UPDATE
Dail Total Rainfall Inches
Y (inches) See Figure 6-8
`�
1r
APPROVED BY: E. WEBSTER
MARSHALL STEAM STATION
for monitoring
locations
WnTerra
PROJECT MANAGER: B. WILKER
TERRELL, NORTH CAROLINA
www.synterracorp.com

CCR-9S
CCR-11S
CCR-12S
769 5
788
5
789
5
0 768
00 787
00 788
00
1r
4
4
4
Z 787
Z 767
Z 786
0
3�
0
3�
0
3
M
—
o
—
a 786
—
> 766
4-
> 785
,m
>
w
c
c
c
y
2 W
—y
2 W
785
2 W
d 765
a>i 784
a>i
J
J
J
L
L
L
784
3 764
1
3 783
1
3
1
783
782
11
0
763 0
0
05/01/19 06/01/19 07/01/19 08/01/19 09/01/19 10/01/19
05/01/19 06/01/19 07/01/19 08/01/19 09/01/19 10/01/19
05/01/19 06/01/19 07/01/19 08/01/19 09/01/19 10/01/19
Date
Date
Date
CCR-9S Water Elevation (NAVD 88)
CCR-11S Water Elevation (NAVD 88)
CCR-12S Water Elevation (NAVD 88)
CCR-14S
AB-3 Cluster
A13-5S
794 5
797
789
5
5
0000 788
0000 793
0000 796
p
4
p
4
p
4
Q
Q
Q
Z 787
Z 792
Z 795
c
0
c
3"
c
0
c
3"
c
0
c
3 ;,
y 786
=
y 791
> 794
W-
W
-
W
-
G7
2W
@
Dry conditions present at
2
d
2 W
785
J 790
AB-3S. Transferred
J 793
L
L
transducer to A13-3D upon
L
data download.
3 784
I
1
3 789
14J
3 792
1
783
0
'
791
0
788 0
05/01/19 06/01/19 07/01/19 08/01/19 09/01/19 10/01/19
05/01/19 06/01/19 07/01/19 08/01/19 09/01/19 10/01/19
05/01/19 06/01/19 07/01/19 08/01/19 09/01/19 10/01/19
Date
Date
Date
CCR-14S Water Elevation (NAVD 88)
AB-3S Water Elevation (NAVD 88)
AB-5S Water Elevation (NAVD 88)
AB-3D Water Elevation (NAVD 88)
LEGEND Notes:
tDUKE
DRAWN BY: D.AVARD DATE:11/0S/2019Ash
Pore Water NAVD 88 - North
ENERGY
REVISED BY: E. WEBSTER
FIGURE 6-10b
ve
American rtical
Gravity Flow Decanting Start (07/16/2019) Shallow Flow Zone
CAROLINAS
HYDROGRAPHS — ASH BASIN AND VICINITY
Datum 19
Mechanical Decanting Start (09/13/2019) Bedrock Flow Zone in - inches
E.
CHECKED BY: EWEBSTER
CORRECTIVE ACTION PLAN UPDATE
Dail Total Rainfall Inches
Y (inches) see Figure 6-8
��
APPROVED BY: E. WEBSTER
MARSHALL STEAM STATION
for monitoring
locations
synTerra
PROJECT MANAGER: B. WILKER
TERRELL, NORTH CAROLINA
www.synterracorp.com

AB-8S
AB-9S
MW-7S
792
5
771
5
794
5
00
00
00
00
00
00
793
4
791
4
770
4
a
a
a
z
z
z
r
792
3=
r
790
3_
769
3''
w
w
w
U
U
W
M
W
M
W
>
791
2�
>
789
2�
> 768
2
J
J
J
L
L
L
3
790
I
1
4-1
3
788
1
3 767
1
787
0
766
I
0
789
0
05/01/19 06/01/19 07/01/19 08/01/19 09/01/19
10/01/19
05/01/19 06/01/19
07/01/19 08/01/19
09/01/19 10/01/19
05/01/19
06/01/19 07/01/19 08/01/19 09/01/19 10/01/19
Date
Date
Date
AB-8S Water Elevation (NAVD 88)
AB-9S Water Elevation (NAVD 88)
MW-7S Water Elevation (NAVD 88)
CCR-13S
789
5
00
788
4
Q
Z
787
o
3c
d786
c
W
2W
>
785
J
L
3
784
I
1
783 0
5/1/2019 6/1/2019 7/1/2019 8/1/2019 9/1/2019
10/1/2019
Date
CCR-13S Water Elevation (NAVD 88)
LEGEND
Notes:
DUKE
DRAWN BY: D.AVARD
DATE:11/0S/2019
Ash Pore Water
NAVD 88 - North
� ENERGY
REVISED BY: E. WEBSTER
FIGURE 6-10c
Gravity Flow Decanting Start (07/16/2019)
Shallow Flow Zone
American ve
Vertical
CAROLINAS
HYDROGRAPHS — ASH BASIN AND VICINITY
Mechanical Decanting Start (09/13/2019)
Datum 19
in - inches
CHECKED BY: E. WEBSTER
CORRECTIVE ACTION PLAN UPDATE
Dail Total Rainfall Inches
Y (inches)
see Figure 6-8
APPROVED BY: E. WEBSTER
MARSHALL STEAM STATION
for monitoring
locations
synTerra
PROJECT MANAGER: B. WILKER
TERRELL, NORTH CAROLINA
www.synterracorp.com

101111
,789
00
00
z
..
..
i
Q)
W
i
L 787
ca
:.
Ash Basin Pond
5/1 /2019 6/1 /2019 7/1 /2019
Date
5
F:1
00 800
.,
>
3 _
z
w
"
=
_
2 795
of °c
M
2
W
�7
i
790
L
1
*'
M
785
[17
Ash Basin Ponded Water Monitoring
Removed
transducers in SG-02
and SG-03 due to site
operations.
8/1 /2019 9/1 /2019 1 4/1 /2019 5/1 /2019 6/1 /2019 7/1 /2019 8/1 /2019 9/1 /2019 10/1 /2019
Ash Basin Pond Level Elevation (NAVD 88)
LEGEND
Gravity Flow Decanting Start (07/16/2019)
Mechanical Decanting Start (09/13/2019)
Daily Total Rainfall (inches)
DUKE
Notes: ENERGY®
NAVD 88 - North American Vertical
Datum 1988
in - inches
CAROLINAS
See Figure 6-8 for monitoring
10
locations
synTerra
DRAWN BY: D. AVARD
REVISED BY: E. WEBSTER
CHECKED BY: E. WEBSTER
APPROVED BY: E. WEBSTER
PROJECT MANAGER: B. WILKER
www.synterracorp.com
5
E
[I;
Date
SG-01 Water Elevation (NAVD 88)
SG-02 Water Elevation (NAVD 88)
SG-03 Water Elevation (NAVD 88)
SG-04 Water Elevation (NAVD 88)
SG-05 Water Elevation (NAVD 88)
SG-06 Water Elevation (NAVD 88)
DATE:11/05/2019
FIGURE 6-10d
HYDROGRAPHS — ASH BASIN PONDED WATER
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

Ash
Pore Water Legend
.d
AB-O3S
Z�,
AB-12SL
•
AB-O4S
AB-13S
A
AB-O4SL
Q
AB-14S
AB-O6S
X
AB-15S
AB-O7S
*
AB-15SL
Z
AB-O8S
■
AB-18S
*
AB-1OS
0
AB-2OS
❑
AB-1OSL
A
AL-03S
O
AB-12S
Potential
Mixing
Generally
Unaffected
I Affected I
�► z ..
j � _ z -■
\, r
o° , � u • �, moo
80%
60% • b .rG—/ •
/40% o- v i • Qo
■ L �•
20% � -
f •
000 00°
0 0 0
E— Ca
Deep Groundwater Legend
■
AB-01D
•
CCR-04D
GP-02D
■
ILF-01D
•
AB-02D
A
CCR-05D
GP-03D
•
ILF-02D
`
AB-04D
V
CCR-09DA
GWA-01D
A
MW-06D
AB-05D
♦
CCR-11D
GWA-02DA
V
MW-07D
♦
AB-07D
Z
CCR-12D
GWA-03D
♦
MW-09D
Z
AB-14D
*
CCR-13D
GWA-04D
Z
MW-10D
*
AB-21D
❑
CCR-14D
GWA-05D
*
MW-11D
❑
AL-01D
O
CCR-15D
GWA-07D
❑
MW-12D
O
AL-02D
CCR-16D
GWA-10D
O
MW-13D
A
AL-03D
p
CP-01D
GWA-11D
A
MW-14D
p
AL-04D
Q
CP-02D
GWA-13DA
V
PVSF-01D
O
CCR-01D
X
CP-03D
GWA-14D
O
PVSF-02D
X
CCR-02D
GP-01D
GWA-15D
X
PVSF-03D
■
CCR-03D
80%
A
60%
Mike
a
20% Z •_-
v "toms z•
�Oo OOo �Oo
0 0 0
�— Ca
f. Oo A
AQ
A ♦•�_❑,
Shallow
80%
Groundwater — Cl —10
Bedrock Groundwater Legend
Affected
■
AB-01BR
Z
AB-09D
p AB-18D
• GWA-09BR
•
AB-01BRL
AB-10BR
O AB-20D
A GWA-11BR
d
`
AB-01BRLL
AB-10BRL
• AL-01BR
V GWA-12BR
k
Potential
7
AB-01BRLLL
AB-10D
AL-01BRL
♦ ILF-01BR
O
Mixing
♦
AB-02BR
AB-11D
A AL-02BR
Z MW-04D
Z
AB-03D
AB-12BR
V AL-02BRL
* MW-08D
o\°
*
AB-05BR
AB-12D
♦ AL-02BRLL
❑ MW-14BR
NZ
❑
AB-06BRA
AB-13D
Z AL-02BRLLL
O MW-14BRL
Generally
O
AB-06BRL
AB-15BR
* AL-03BR
A PVSF-01BR
Unaffected
A
AB-06D
AB-15D
❑ AL-04BR
p PVSF-02BR
p
AB-08D
AB-16D
O AL-04BRL
O PVSF-03BR
O
AB-09BR
AB-17D
GWA-01BR
00
\°
Affected
0
Oo
�
Olt �o
G oN60%cl3
O°
2�
Potential
O
oQo
°\° Qp
Mixing
AA
0 %
o
00
-
Deep
Groundwater
Background Monitoring
60% �'O Well Legend
■ BG-01BRA ❑ BG-03S
40% • BG-01D O GWA-06D
A BG-01S A GWA-06S
20% T BG-02BR p GWA-081D
♦ BG-02S Q GWA-08S
Z BG-03BR X GWA-12D
o\° * BG-03D y GWA-12S
AB-01S
AB-16DU
,
CCR-05S
V
GWA-04S
O
ILF-02S
❑
MS-15
V
MW-085
•
CP-035
AB-02S
AB-16S
Z
CCR-13S♦
GWA-07S
■
MS-08
O
MS-16
♦
MW-095A
GP-01S
AB-05DU
AL-01S
*
CCR-14S
Z
GWA-10S
•
MS-09
L
MW-01
z
MW-10S
V
GP-02S
AB-07DU
AL-02S
]
CCR-15S
*
GWA-11S
A
MS-10
7
MW-02
*
MW-11S
♦
GP-03S
♦
AB-08DU
CCR-01S
-
CCR-16S
❑
GWA-13S
V
MS-11
O
MW-03
❑
MW-12S
Z
OB-01 (Ash Basin)
Z
AB-09S
CCR-02S
■
GWA-01S
O
GWA-14S
♦
MS-12
-
MW-04
O
MW-13S
*
OB-01 (Dry Ash Landfill
*
AB-11S
CCR-03S
•
GWA-02S
p
GWA-155
I
MS-13
MW-05
p
MW-145
❑
PVSF-015
❑
AB-14DU
CCR-04S
A
GWA-03S
0
ILF-01S
*
MS-14
A
MW-07 (OB-03)
■
CP-02S
0
PVSF-02S
CI —s
o\° \
V
2
/40% v
■0 �•
20% 7 •
Ak � _ Q
^� z
Sp.
0 0 0
�— Ca
80%
P
60%
Generally
Unaffected
a
CO ° 80%
x I�
so `
QUO • 60% 0O
00O �
z 40%\
Bedrock IV
Groundwater — Cl

Note:
*Samples taken before
1/1/2018
Potential
Mixing
Generally
Unaffected
Affected
Source Water Legend
■ Ash Basin*
• MssW001*
■ MssW002*
o\O
0
16-1
o r
\°
Surface
Water
Legend
C�
� o CO,
x o`
■
SW-01
❑
SW-102
COof
•
5W-02
5W-103
°\o
■
SW-03*
Q
5W-104
\`
*
■
SW-06*
g
SW-105
moo
�°
♦
SW-07
SW-106
Q
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DRAWN BY: C. WYATT DATE: 11/08/2019
REVISED BY: C. WYATT DATE: 12/19/2019
CHECKED BY: E. WEBSTER DATE: 12/19/2019
APPROVED BY: B. WILKER DATE: 12/19/2019
synTerra PROJECT MANAGER: B. WILKER
www.synterracorp.com
FIGURE 6-13a
ISOCONCENTRATION MAP
BORON IN SHALLOW FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

u t'
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DRAWN BY C. WYATT DATE: 10/25/2019
REVISED BY C. WYATT DATE: 12/19/2019 CORRECTIVE ACTION PLAN UPDATE
CHECKED BY 0MARSHALL STEAM STATION

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DRAWN BY: C.WYATT DATE:10/25/2019 CORRECTIVE ACTION PLAN UPDATE
REVISED BY: C. WYATT DATE: 12/19/2019
CHECKED BY: E. WEBSTER DATE: 12/19/2019 MARSHALL STEAM STATION
' APPROVED BY: B.WILKER DATE: 12/19/2019 TERRELL NORTH CAROLINA
♦ Syr,- YTem PROJECT MANAGER: B. WILKER
�.♦
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INDUSTRIAL STRUT
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APPROVED BY: B. WILIKER DATE: 12/19/2019
REVISED BY.C. WYATT DATE: ,
STATIONCHECKED BY.' E. WEBSTER
PROJECT MANAGER: B. WILKER

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DRAWN BY: C. WYATT DATE: 10/25/2019
REVISED BY: C. WYATT DATE: 12/19/2019
CHECKED BY: E. WEBSTER DATE: 12/19/2019
APPROVED BY: B. WILKER DATE: 12/19/2019
Y� PROJECT MANAGER: B. WILKER
�yr, www.synterracorp.com
FIGURE 6-16b
ISOCONCENTRATION MAP
IRON IN BEDROCK FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

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DRAWN BY: C. WYATT DATE: 10/25/2019
REVISED BY: C. WYATT DATE: 12/19/2019
CHECKED BY: E. WEBSTER DATE: 12/19/2019
♦, ' APPROVED BY: B. WILKER DATE: 12/19/2019
�
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NvI;'rlel
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FIGURE 6-17a
ISOCONCENTRATION MAP
LITHIUM IN SHALLOW FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

u
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REVISED BY: C. WYATT DATE: 12/17/2019
J�jp
CHECKED BY: E. WEBSTER DATE: 12/17/2019
APPROVED BY: B. WILKER DATE: 12/17/2019
— YTem
PROJECT MANAGER: B. WILKER
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FIGURE 6-17b
ISOCONCENTRATION MAP
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CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

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` APPROVED: B.
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(IN FEET)
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BY: C. WYATT DATE: 10/25/2019
REVISED BY: C. WYATT DATE: 12/19/2019
'
CHECKED BY: E. WEBSTER DATE: 12/19/2019
♦, APPROVED BY: B. WILKER DATE: 12/19/2019
�.♦ Syr,- YTem PROJECT MANAGER: B. WILKER
www.s nterracor .com
NOTES:
FIGURE 6-18a
ISOCONCENTRATION MAP
MANGANESE IN SHALLOW FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

u
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J�jp REVISED BY: C. WYATT DATE: 12/19/2019
CHECKED BY: E. WEBSTER DATE: 12/19/2019
APPROVED BY: B. WILKER DATE: 12/19/2019
YTem PROJECT MANAGER: B. WILKER
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FIGURE 6-18c
ISOCONCENTRATION MAP
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CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

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fun DUKE 600 0 600 1,200
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CAROLINAS ""FEET' TOTAL RADIUM IN BEDROCK FLOW ZONE
DRAWN BY: C. WYATT DATE: 10/25/2019 CORRECTIVE ACTION PLAN UPDATE
J�jp REVISED BY: C. WYATT DATE: 12/19/2019
CHECKED BY: E. WEBSTER DATE: 12/19/2019 MARSHALL STEAM STATION
APPROVED BY: B. WILKER DATE: 12/19/2019 TERRELL NORTH CAROLINA
YTeM PROJECT MANAGER: B. WILKER
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WEBSTER DATE: 12/29/2019
.�'° ��JI/\/ � O • O � �-- /'- � APPROVED BY: B. WICKER DATE: 12/29/2019
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O synTer ra
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NOTES:
FIGURE 6-20a
ISOCONCENTRATION MAP
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CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

u r
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ENERGY. ONE:Zmmg:::::�� ISOCONCENTRATION MAP
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• DATE: 10/25/2019
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CAROLINAS DRAWN BY: C. WYATT DATE:10/2
(IN FEET' STRONTIUM IN BEDROCK FLOW ZONE
i 9/2019 CORRECTIVE ACTION PLAN UPDATE
`' REVISED BY: C. DATE: 12/29/2019 MARSHALL STEAM STATION
CHECKED BY: E..WEB WEBSTER DATE: 12/29/2019
.� APPROVED BY: B.WILKER DATE:12/29/2019 TERRELL NORTH CAROLINA
WnTerra PROJECT MANAGER: B. WILKER
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! .' L- AB-14DU "� Mw-2 �. AVAILABLE.
g20 38 A-13S �' j 109 �--1� 295 G53A 1 ASH BASIN WASTE BOUNDARY
�o - , �9 49 R-14S v — . — . ASH BASIN COMPLIANCE BOUNDARY
s y o ► ------ LANDFILL BOUNDARY
1�� AB-7DU �� AB-9S GWA-15S
MW-12S
31 t � 169 � � /$ -
°°° PvsF-1s STRUCTURAL FILL BOUNDARY
87 A13-81DU ;' GWA-11 LANDFILL COMPLIANCE BOUNDARY
°jo o� 219 CCR-11S �.
CCR-12S 343 eo ' - DUKE ENERGY CAROLINAS PROPERTY LINE
..IN 476 MW-1 • MW-6S
lie MW-11S OB-1 (Ash / 399 94 TOPOGRAPHIC CONTOUR (10' INTERVAL)
GWA-12S �50 Basin) �._ a �► GROUNDWATER FLOW DIRECTION
130 is o 27
MSS . CCR-9S
... t . llml:t t �o ` 54 \' C6 � STREAM (MCKIM & CREED)
Mr -I♦`
• ��o
MS-9 . MW-10S ®WETLAND (MCKIM &CREED)
es Ms-10 6s t. `- 28 0 APPROXIMATE HYDROLOGIC DIVIDE
° 28 ■ ic MS-16'
r ! 86 NOTES:
MW-7S
♦ • 1. DATA INCLUDED IN THIS ETFIGUREFARE THE MEAN FOR WELLS BASED 18 THE CENTRAL
• 475 TENDENCY OF THE DATA SET FROM SAMPLES BETWEEN FEBRUALI 2018 AND MAY 2019.
O • , , FOR WELLS WITH ID SAMPLE
CONTAINING FEWER THAN FOUR VALID RESULTS, THE
MS-15 AB-5DU AB-2S MOST RECENT VALID SAMPLE DATA WAS USED.
MS-11 103 2. THE 02L STANDARD FOR TDS IS 500 mg/L.
e�0 42 248 36 MW-9S Q
3. THE BACKGROUND VALUE FOR TDS IS 152.4 mg/L.
MS-14 4. GROUNDWATER FLOW AND TRANSPORT TDS PLUME IS MODIFIED FROM MODEL
CP-2S
■ 65 CCR-5S LAYER 8 (FALTAAND OTHERS, 2019).
284
°O ■ • ■ MS-13 5. HYDROLOGIC DIVIDE INDENTIFIED IN CSA UPDATE (SYNTERRA, 2018)AND UPDATED
° 45 277 CCR-2S-- GROUNDWATER FLOW AND TRANSPORT MODELING REPORT (FALTAAND OTHERS,
0 • 62 -
CCR-4S •, 2019).
ccR-1 s
♦ / / 6. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY
GP-2S 81 �� ■ - CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO BE
USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND
MS-12 ® ♦ GWA-2S ♦ , • ' C A STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND DELINEATION
32 0 ,'' 111 .�J ✓ GWA-1S / g10 CONDUCTED BY MCKIM &CREED MARCH 2O16.
O 60 CCR-3S 7. THE TOPOGRAPHY IS SHOWN FOR REFERENCE PURPOSES ON LY AND SHOULD NOT
1 ♦ 1/ BE USED FOR DESIGN OR ENGINEERING PURPOSES. TOPOGRAPHY IS OBTAINED FROM
a � � . ♦ lie
✓ / � 39 CATAWBA COUNTY G I S WEB ISTE AT https://www.catawbacountync.gov/online-
��� services/datasets/.
1------- -
� 95 GP-3S � CP-3S •' � 8. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
910 66 135 ., 9. AERIAL PHOTOGRAPHY OBTAINED FROM GOGGLE EARTH PRO ON JULY 26, 2018.
IMAGE COLLECTED ON MARCH 30, 2018.
D / 10. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
�' a • • I • '� �. GREENWOOD RD COORDINATE SYSTEM RIPS 3200 (NAD83).
GRAPHIC SCALE FIGURE 6-21a
60o O < DUKE 600 0 600 1,200 ENERGY® ISOCONCENTRATION MAP
CAROLINAS (IN FEET) TOTAL DISSOLVED SOLIDS
0 DRAWN BY: C.WYATT DATE:10/25/2019 IN SHALLOW FLOW ZONE
REVISED BY: C.DATE:12/27/2019
\U\ � CHECKED BY: E.. WEB WEBSTER DATE:12/27/2019 CORRECTIVE ACTION PLAN UPDATE
APPROVED BY: B. WILKER DATE:12/27/2019 MARSHALL STEAM STATION
yPROJECT MANAGER: B. WILKER
`" �' snTerla www.synterracorp.com TERRELL, NORTH CAROLINA

u r
MA ME 0 �IEMJJ
I KPINel
'INDUSTRIAL STRUILF 'END
CI UR
LANDFILL #1 ' - /J
ASBESTOS ♦LANDFILL
LA/NDFILL
�
�
rim � ASH BASIN
STR JCTURAL
FILL
DRYASH L AREA
LANDFILL
(PHASE1)190
i r►
l�
I �
ACCESS ROAD I �� '1 �•'
STRUCTURAL
� ( 4 � LAKE NORMAN
APPROXIMATE HYDROLOGIC DIVIDE
a
FGD �
RESIDUE �.
LANDFILLI ■• �, � ,
■
HOLDING
BASIN , , a• i
■ I 4
NVIINW
LRB � `COAL
� • • PILE �� �•
� GYPSUM �� ,: ��■
I� III MARSHALL STEAM STATION
•GRAPHIC SCALEFIGURE
ENERGY. EnEzzool:=:�� ISOCONCENTRATION MAP
•LINAS (IN FEET) TOTAL DISSOLVED• •ZONE
/ .-. .. .
REVISED: CORRECTIVE ACTION
CHECKED: ..STATION

I
GWA-12D
150
GWA-12BR
112
fi
f
✓ I
.. , 3WA-8D
W-4 ID
M
4B-17D ILF-1BR�
39 ._ 126
GWA-6D
104
18D
♦ 196 V AL-4BRL 422 1
��� AB- 134
\l 199
9BIR I
456
AB-15D AB-15BR
271 286
AB-20D
132 AL-2BRLLL
AB-13D L AL-2BRL 402
222 439 aao
80
0 AB-10D . -
332 - .� MW-1`
158
AB-12BR AB-10BR AB-10BRL MW-1-
377 341 AL-1BR 209
♦ AB-9D 492 ,>
147
` AL-1 BRL
v PVSF-1B27 187AB-474
a 158 � � � 187
AB-6D
32
376 °
IN. \mil
%�-J-
FGD
RE
537
HULUI
BASIN
GYPOSUM
PAD
BG-3D
p 181
V
J
1
BORRI
Q
I
GWA-11B
20
;1Ba
MW-8D
383
A -
353
• ' �`�.I/ GREENWGOD RD
/' DUKE
4 ENERGY
600 GRAPHIC SCALE600 1,200
CAROLINAS
(IN FEET)
DRAWN BY: C. WYATT DATE: 10/25/2019
REVISED BY: C. WYATT DATE: 12/19/2019
CHECKED BY: E. WEBSTER DATE: 12/19/2019
APPROVED BY: B. WILKER DATE: 12/19/2019
synTerra
PROJECT MANAGER: B. WILKER
www.synterracorp.com
LEGEND
• ASSESSMENT MONITORING WELL - GREATER
THAN NC 02L STANDARD (500 mg/L)
ASSESSMENT MONITORING WELL - GREATER
THAN BACKGROUND VALUE (195 mg/L)
ASSESSMENT MONITORING WELL
BACKGROUND MONITORING WELL
WELLABANDONED
TDS PLUME GREATER THAN NC 02L STANDARD
(500mg/L) FROM MEAN ANALYSIS. FLOW AND
TRANSPORT MODEL PREDICTED PLUME IS
USED WHERE EMPIRICAL DATA IS NOT
AVAILABLE.
TDS PLUME GREATER THAN BACKGROUND
(195 mg/L) FROM MEAN ANALYSIS. FLOW AND
TRANSPORT MODEL PREDICTED PLUME IS
USED WHERE EMPIRICAL DATA IS NOT
AVAILABLE.
ASH BASIN WASTE BOUNDARY
- — - ASH BASIN COMPLIANCE BOUNDARY
LANDFILL BOUNDARY
STRUCTURAL FILL BOUNDARY
LANDFILL COMPLIANCE BOUNDARY
- - DUKE ENERGY CAROLINAS PROPERTY LINE
TOPOGRAPHIC CONTOUR (10' INTERVAL)
11- GROUNDWATER FLOW DIRECTION
STREAM (MCKIM & CREED)
® WETLAND (MCKIM & CREED)
APPROXIMATE HYDROLOGIC DIVIDE
NOTES:
1. DATA INCLUDED IN THIS FIGURE ARE THE MEAN FOR WELLS BASED ON THE CENTRAL
TENDENCY OF THE DATA SET FROM SAMPLES BETWEEN FEBRUARY 2018 AND MAY
2019. FOR WELLS WITH DATA SETS CONTAINING FEWER THAN FOUR VALID RESULTS,
THE MOST RECENT VALID SAMPLE DATA WAS USED.
2. THE 02L STANDARD FOR TDS IS 500 mg/L.
3. THE BACKGROUND VALUE FOR TDS IS 195 mg/L.
4. GROUNDWATER FLOW AND TRANSPORT TDS PLUME IS MODIFIED FROM MODEL
LAYER 10 (FALTAAND OTHERS, 2019).
5. HYDROLOGIC DIVIDE INDENTIFIED IN CSA UPDATE (SYNTERRA, 2018 AND UPDATED
GROUNDWATER FLOW AND TRANSPORT MODELING REPORT (FALTAA D OTHERS,
2019).
6. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY
CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO BE
USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND DELINEATION
CONDUCTED BY MCKIM & CREED MARCH 2O16.
7. THE TOPOGRAPHY IS SHOWN FOR REFERENCE PURPOSES ONLYAND SHOULD NOT
BE USED FOR DESIGN OR ENGINEERING PURPOSES. TOPOGRAPHY IS OBTAINED FROM
CATAW BA COUNTY GIS W EBISTE AT https://www.catawbacountync.gov/online-
s—Ices/datasets/.
8. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
9. AERIAL PHOTOGRAPHY OBTAINED FROM GOGGLE EARTH PRO ON JULY 26, 2018.
IMAGE COLLECTED ON MARCH 30, 2018.
10. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINASTATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83).
FIGURE 6-21c
ISOCONCENTRATION MAP
TOTAL DISSOLVED SOLIDS
IN BEDROCK FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

0
� FIFI LI 4,
O, 1 ASH BASIN
• 111, a
Pv -�
STRUCTURAL
FILL
1
ACCESS ROAD (-
i
STRUCTURAL FILL
i .
' '•� I
FGD ', ���i►
LAKE NORMAN
° O
0
LEGEND
oll�
141
� o
o o
o '.
Q ❑ 620
eti° • ❑ —
.1 GREENWOOD RD
1
J
0 O GRAPHIC SCALE
000 CIS DUKE 600 0 600 1,200 FIGURE 6-22
e • e ENERGY ISOCONCENTRATION MAP
CAROLINAS (IN FEET) THALLIUM IN SHALLOW FLOW ZONE
DRAWNBY.'C.WYATT DATE:10/17/2019 CORRECTIVE ACTION PLAN UPDATE
REVISED BY: C. WYATT DATE: 12/17/2019
CHECKED BY: E. WEBSTER DATE: 12/17/2019 MARSHALL STEAM STATION
' APPROVED BY: B.WILKER DATE:12/17/2019 TERRELL NORTH CAROLINA
♦ - Y� PROJECT MANAGER: B. WICKER
�.♦ Syr,
www.synterracorp.com

ryLt`-
PVSF-3BR (2'-4')
COI RESULT 2019 BTV PSRG
Iron 1 79,000 1 78,228 150
PVSF-3BR (6'-8')
COI I RESULT 12019BTV PSRG
Iron 1 85,000 1 78,228 150
•�..;
i r -
♦ ■All
D-11(0-V) ! • ■
COI I RESULT 12019BTVI PSRG ' J OxN��
Iron 1 85,000 1 78,228 1 150
B-11(6.5'-7.5')
PVSF-3BR (6'-8')
COI I RESULT 12019BTV PSRG
Iron 1 85,000 1 78,228 150
•�..;
i r -
♦ ■All
D-11(0-V) ! • ■
COI I RESULT 12019BTVI PSRG ' J OxN��
Iron 1 85,000 1 78,228 1 150
B-11(6.5'-7.5')
•�..;
i r -
♦ ■All
D-11(0-V) ! • ■
COI I RESULT 12019BTVI PSRG ' J OxN��
Iron 1 85,000 1 78,228 1 150
B-11(6.5'-7.5')
COI
RESULT
2019 BTV
PSRG
Barium
1,100
1,063
580
Cobalt
160
63
0.9
Manganese
5,400
3,388
65
Thallium
3.9
2.1
0.28
# --
BGSB-
GWA-02 (18'-201)
COI RESULT 2019BTVI PSRG
Cobalt 70 1 6
3 0.9
LRB
GP-1D (0-5')
COI RESULT 2019BTVI PSRG
Sulfate 1,500 1 293 1 1,438
, 77
�'\
GP-3D (2'-T)
3 0.9
LRB
GP-1D (0-5')
COI RESULT 2019BTVI PSRG
Sulfate 1,500 1 293 1 1,438
, 77
�'\
GP-3D (2'-T)
, 77
�'\
GP-3D (2'-T)
COI
I RESULT 12019BTVI
PSRG
Barium
1 1,100 1 1,063
1 580
GP-3D (5-10')
COI RESULT 2019 BTV
obalt 140 63
iganese 4,300 3,388
65
40.
BG-3D (1'-2')
COI RESULT 2019BTV PSRG
Arsenic 8.4 8.2 5.8
Chromium 420 406 3.8
Selenium 6.7 3.7 2.1
BG-31D (10'-12')
COI I RESULT 12019BTVI PSRG
Nickel 1 267 1 237 1 130
AL-11) (32'-34')
COI RESULT 2019 BTV PSRG
Arsenic 10.5 8.2 5.8
Selenium 7.1 1 3.7 2.1
(� DUKE
ENERGY
CAROLINAS
GRAPHIC SCALE
450 0 450 900
(IN FEET)
DRAWN BY: C. DAVIS DATE: 11/04/2019
REVISED BY: C. DAVIS DATE: 12/11/2019
CHECKED BY: E. WEBSTER DATE: 12/11/2019
APPROVED BY: B. WILKER DATE: 12/11/2019
PROJECT MANAGER: B. WILKER
LEGEND
• WITHIN WASTE BOUNDARY - ONE OR MORE
EXCEEDANCES
O BEYOND WASTE BOUNDARY - ONE OR MORE
EXCEEDANCES
BACKGROUND - ONE OR MORE EXCEEDANCES
ASH BASIN WASTE BOUNDARY
- - - - ASH BASIN COMPLIANCE BOUNDARY
LANDFILL COMPLIANCE BOUNDARY
LANDFILL BOUNDARY
STRUCTURAL FILL BOUNDARY
DUKE ENERGY CAROLINAS PROPERTY LINE
STREAM (MCKIM & CREED)
® WETLAND (MCKIM & CREED)
NOTES:
1. REFER TO TABLE 6-3 FOR SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS.
2. 2019 BTVS PRESENTED WERE CALCULATED USING DATA FROM BACKGROUND
UNSATURATED SOIL SAMPLES COLLECTED MAY 2015 TO AUGUST 2018, AND WERE
SUBMITTED TO DEQ ON JUNE 13, 2019.
3. PSRG - PRELIMINARY SOIL REMEDIATION GOALS FOR THE PROTECTION OF
GROUNDWATER (POG); NCDEQ INACTIVE HAZARDOUS SITES BRANCH (IHSB)
PRELIMINARY SOIL REMEDIATION GOALS TABLE (FEBRUARY 2018)
4. THE PSRG FOG DISPLAYED FOR SULFATE WAS CALCULATED IN ACCORDANCE
WITH TABLE 6-2 PRESENTED IN THE CAP UPDATE REPORT TEXT.
5. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY
CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO BE
USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND
DELINEATION CONDUCTED BY MCKIM & CREED MARCH 2O16.
6. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
7. ALL BOUNDARIES ARE APPROXIMATE.
8. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON JULY 26, 2018.
IMAGE COLLECTED ON MARCH 30, 2018.
9. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83).
FIGURE 6-23
UNSATURATED SOIL SAMPLE EXCEEDANCES
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
BG-31D (10'-12')
COI I RESULT 12019BTVI PSRG
Nickel 1 267 1 237 1 130
AL-11) (32'-34')
COI RESULT 2019 BTV PSRG
Arsenic 10.5 8.2 5.8
Selenium 7.1 1 3.7 2.1
(� DUKE
ENERGY
CAROLINAS
GRAPHIC SCALE
450 0 450 900
(IN FEET)
DRAWN BY: C. DAVIS DATE: 11/04/2019
REVISED BY: C. DAVIS DATE: 12/11/2019
CHECKED BY: E. WEBSTER DATE: 12/11/2019
APPROVED BY: B. WILKER DATE: 12/11/2019
PROJECT MANAGER: B. WILKER
LEGEND
• WITHIN WASTE BOUNDARY - ONE OR MORE
EXCEEDANCES
O BEYOND WASTE BOUNDARY - ONE OR MORE
EXCEEDANCES
BACKGROUND - ONE OR MORE EXCEEDANCES
ASH BASIN WASTE BOUNDARY
- - - - ASH BASIN COMPLIANCE BOUNDARY
LANDFILL COMPLIANCE BOUNDARY
LANDFILL BOUNDARY
STRUCTURAL FILL BOUNDARY
DUKE ENERGY CAROLINAS PROPERTY LINE
STREAM (MCKIM & CREED)
® WETLAND (MCKIM & CREED)
NOTES:
1. REFER TO TABLE 6-3 FOR SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS.
2. 2019 BTVS PRESENTED WERE CALCULATED USING DATA FROM BACKGROUND
UNSATURATED SOIL SAMPLES COLLECTED MAY 2015 TO AUGUST 2018, AND WERE
SUBMITTED TO DEQ ON JUNE 13, 2019.
3. PSRG - PRELIMINARY SOIL REMEDIATION GOALS FOR THE PROTECTION OF
GROUNDWATER (POG); NCDEQ INACTIVE HAZARDOUS SITES BRANCH (IHSB)
PRELIMINARY SOIL REMEDIATION GOALS TABLE (FEBRUARY 2018)
4. THE PSRG FOG DISPLAYED FOR SULFATE WAS CALCULATED IN ACCORDANCE
WITH TABLE 6-2 PRESENTED IN THE CAP UPDATE REPORT TEXT.
5. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY
CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO BE
USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND
DELINEATION CONDUCTED BY MCKIM & CREED MARCH 2O16.
6. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
7. ALL BOUNDARIES ARE APPROXIMATE.
8. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON JULY 26, 2018.
IMAGE COLLECTED ON MARCH 30, 2018.
9. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83).
FIGURE 6-23
UNSATURATED SOIL SAMPLE EXCEEDANCES
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
AL-11) (32'-34')
COI RESULT 2019 BTV PSRG
Arsenic 10.5 8.2 5.8
Selenium 7.1 1 3.7 2.1
(� DUKE
ENERGY
CAROLINAS
GRAPHIC SCALE
450 0 450 900
(IN FEET)
DRAWN BY: C. DAVIS DATE: 11/04/2019
REVISED BY: C. DAVIS DATE: 12/11/2019
CHECKED BY: E. WEBSTER DATE: 12/11/2019
APPROVED BY: B. WILKER DATE: 12/11/2019
PROJECT MANAGER: B. WILKER
LEGEND
• WITHIN WASTE BOUNDARY - ONE OR MORE
EXCEEDANCES
O BEYOND WASTE BOUNDARY - ONE OR MORE
EXCEEDANCES
BACKGROUND - ONE OR MORE EXCEEDANCES
ASH BASIN WASTE BOUNDARY
- - - - ASH BASIN COMPLIANCE BOUNDARY
LANDFILL COMPLIANCE BOUNDARY
LANDFILL BOUNDARY
STRUCTURAL FILL BOUNDARY
DUKE ENERGY CAROLINAS PROPERTY LINE
STREAM (MCKIM & CREED)
® WETLAND (MCKIM & CREED)
NOTES:
1. REFER TO TABLE 6-3 FOR SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS.
2. 2019 BTVS PRESENTED WERE CALCULATED USING DATA FROM BACKGROUND
UNSATURATED SOIL SAMPLES COLLECTED MAY 2015 TO AUGUST 2018, AND WERE
SUBMITTED TO DEQ ON JUNE 13, 2019.
3. PSRG - PRELIMINARY SOIL REMEDIATION GOALS FOR THE PROTECTION OF
GROUNDWATER (POG); NCDEQ INACTIVE HAZARDOUS SITES BRANCH (IHSB)
PRELIMINARY SOIL REMEDIATION GOALS TABLE (FEBRUARY 2018)
4. THE PSRG FOG DISPLAYED FOR SULFATE WAS CALCULATED IN ACCORDANCE
WITH TABLE 6-2 PRESENTED IN THE CAP UPDATE REPORT TEXT.
5. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY
CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO BE
USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND
DELINEATION CONDUCTED BY MCKIM & CREED MARCH 2O16.
6. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
7. ALL BOUNDARIES ARE APPROXIMATE.
8. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON JULY 26, 2018.
IMAGE COLLECTED ON MARCH 30, 2018.
9. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83).
FIGURE 6-23
UNSATURATED SOIL SAMPLE EXCEEDANCES
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
(� DUKE
ENERGY
CAROLINAS
GRAPHIC SCALE
450 0 450 900
(IN FEET)
DRAWN BY: C. DAVIS DATE: 11/04/2019
REVISED BY: C. DAVIS DATE: 12/11/2019
CHECKED BY: E. WEBSTER DATE: 12/11/2019
APPROVED BY: B. WILKER DATE: 12/11/2019
PROJECT MANAGER: B. WILKER
LEGEND
• WITHIN WASTE BOUNDARY - ONE OR MORE
EXCEEDANCES
O BEYOND WASTE BOUNDARY - ONE OR MORE
EXCEEDANCES
BACKGROUND - ONE OR MORE EXCEEDANCES
ASH BASIN WASTE BOUNDARY
- - - - ASH BASIN COMPLIANCE BOUNDARY
LANDFILL COMPLIANCE BOUNDARY
LANDFILL BOUNDARY
STRUCTURAL FILL BOUNDARY
DUKE ENERGY CAROLINAS PROPERTY LINE
STREAM (MCKIM & CREED)
® WETLAND (MCKIM & CREED)
NOTES:
1. REFER TO TABLE 6-3 FOR SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS.
2. 2019 BTVS PRESENTED WERE CALCULATED USING DATA FROM BACKGROUND
UNSATURATED SOIL SAMPLES COLLECTED MAY 2015 TO AUGUST 2018, AND WERE
SUBMITTED TO DEQ ON JUNE 13, 2019.
3. PSRG - PRELIMINARY SOIL REMEDIATION GOALS FOR THE PROTECTION OF
GROUNDWATER (POG); NCDEQ INACTIVE HAZARDOUS SITES BRANCH (IHSB)
PRELIMINARY SOIL REMEDIATION GOALS TABLE (FEBRUARY 2018)
4. THE PSRG FOG DISPLAYED FOR SULFATE WAS CALCULATED IN ACCORDANCE
WITH TABLE 6-2 PRESENTED IN THE CAP UPDATE REPORT TEXT.
5. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY
CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO BE
USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND
DELINEATION CONDUCTED BY MCKIM & CREED MARCH 2O16.
6. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
7. ALL BOUNDARIES ARE APPROXIMATE.
8. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON JULY 26, 2018.
IMAGE COLLECTED ON MARCH 30, 2018.
9. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83).
FIGURE 6-23
UNSATURATED SOIL SAMPLE EXCEEDANCES
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

Corrective Action Plan Update December 2019
Marshall Steam Station SynTerra
Figure 6-24
Simplified Pourbaix Diagram
Included in Section 6 text

! 1 \e . r ♦ PRE -DECANTING CONDITIONS
'�.`♦ ♦ ` ��
! 1 `�
'�.J�
'' r ♦ APPROXIMATE MODEL YEAR 2720
♦ ` CLOSURE -IN -PLACE
! 1
'�.i♦' •
♦N r ♦ APPROXIMATE MODEL YEAR 2720
♦ ` CLOSURE -BY -EXCAVATION
r
r
r
.,, ♦� ``�r.e.
:_ ti
I� ate+
� `. `� ��,
o a
r
♦ ♦
a
♦
t
414
ft.
I
l
I
•
\#
,.
•
. y
I♦�.��I♦
I
I ��.� o'
I I�I♦
y I
fj
LEGEND
WIT-1 �11-1 loll
-BORON CONCENTRATION RANGE — - LANDFILL COMPLIANCE BOUNDARY
>4,000 /L
( N9 ) DUKE ENERGY CAROLINAS PROPERTY LINE
NOTES:
HAS NOT BEEN AN.THIS MAP BY
1. THE CORPS OF THE THE
NUS OT
CORPS IS ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT AM BE USED
FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND STREAMS
/' DUKE
� ENERGY®
500
GRAPHIC SCALE
0 500 1,000
FIGURE 6-25
SIMULATED BORON CONCENTRATIONS
Q BORON CONCENTRATION RANGE � STREAM (MCKIM &CREED)
BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND DELINEATION CONDUCTED BY
MCKIM &CREED MARCH 2O16.
CAROLINAS
(IN FEET)
IN ALL FLOW ZONES
(700 - 4,000 pg/L)
® WETLAND (MCKIM & CREED)
2.ALL BOUNDARIES ARE APPROXIMATE.
DRAWN BY.'C.WYATT DATE:11/11/2019
REMEDIAL ALTERNATIVE 1, MNA
�ASHBASINWASTEBOUNDARY
3.PROPERTYBOUNDARYPROVIDEDBYDUKEENERGYCAROLINAS.
��
REVISED BY: C. DAVIS DATE: 12/27/2019
CHECKED BY: E. WEBSTER DATE: 12/27/2019
CORRECTIVE ACTION PLAN UPDATE
-� ASH BASIN COMPLIANCE BOUNDARY
4. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON JULY 26,2018.
COLLECTED ON MARCH 30, 2018.
IMAGE
APPROVED BY: B. WILKER DATE:12/27/2019
MARSHALL STEAM STATION
LANDFILL BOUNDARY
5. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINASTATE PLANE
COORDINATE SYSTEM FIPS 3200 (NAD83).
synTerrd
PROJECT MANAGER: A.ALBERT
TERRELL, NORTH CAROLINA
www.synterracorp.com

/
/
/
/
/
/
/
/
/
/
TRANSMISSION LINE
RIGHT-OF-WAY
(APPROXIMATE)
ASH BASIN
NOTES:
1. NOT ALL UTILITIES ARE IDENTIFIED ON THIS DRAWING. THE UTILITIES SHOWN ON THIS DRAWING ARE VISUAL AIDS.
THE HORIZONTAL AND VERTICAL LOCATION HAVE NOT BEEN FIELD VERIFIED AND ARE APPROXIMATE.
2. THE TOPOGRAPHY IS SHOWN FOR REFERENCE PURPOSES ONLY AND SHOULD NOT BE USED FOR DESIGN OR ENGINEERING PURPOSES.
TOPOGRAPHY IS BASED ON LIDAR BARE EARTH DATA OBTAINED FROM THE NORTH CAROLINA SPATIAL DATA SITE
https.,//sdd.nc.gov/sdd/DataDownload.aspx.
3. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION.
THIS MAP IS A PRELIMINARY JURISDICTIONAL DETERMINATION ONLY. THE PRELIMINARY WETLANDS AND STREAMS BOUNDARIES
WERE OBTAINED FROM MCKIM&CREED DRAWINGS FOR MARSHALL STEAM PLANT DATED MARCH, 2016.
4. ALL BOUNDARIES ARE APPROXIMATE.
DUKE
ENERGY
CAROLI NAS
141P
synTena
1*0
810
s
a"L
-J o0
c
( 5,000 GALLON
EQUALIZATION TANK
GROUNDWATER
TREATMENT Aso
SYSTEM
/O
NPDES OUTFALL 002
ZONE OF REAGENT
INJECTION
(143 BORINGS)
LEGEND
SURFACE WATER
INTAKE STRUCTURE
tl (IF NEEDED)
4-iiiIi-z
LAKE NORMAN
J
PROPOSED CORRECTIVE ACTION INFRASTRUCTURE
INFLUENT PIPE
FORMER ASH BASIN FOOTPRINT
m
INFILTRATION PIPE
ASH BASIN WASTE BOUNDARY
DISCHARGE PIPE
ASH BASIN COMPLIANCE BOUNDARY
EXTRACTION WELLS
LANDFILL BOUNDARY
ZONE OF REAGENT
LANDFILL COMPLIANCE BOUNDARY
INJECTIONS (143 BORINGS)
•
TANK
STREAM (NOT USACE APPROVED) [AMEC 20151
0 SURFACE WATER
.
GROUNDWATER TREATMENT
SYSTEM
(AERIAL PHOTOGRAPH & TOPOGRAPHIC MAP BASED)
0 WETLAND BY MCKIM &CREED
INFILTRATION GALLERY
OHE OVERHEAD POWER
PIPING FLOW DIRECTION
-800- TOPOGRAPHIC CONTOUR (10' INTERVAL)
TOPOGRAPHIC CONTOUR (2' INTERVAL)
GRAPHIC SCALE
200 0 200 400
IN FEET
DRAWN BY: J. CHASTAIN DATE: 8/15/2019
REVISED BY: J. CHASTAIN DATE: 12/24/201
CHECKED BY: W. GERALD DATE: 12/24/201
APPROVED BY: W.GERALD DATE:12/24/201
PROJECT MANGER: B. WILKER
LAYOUT: FIGURE 6-19
www.synterracorp.com
vNPDESOUTFALL 002 NPDES OUTFALL(APPROXIMATE)
FIGURE 6-26
CONCEPTUAL GROUNDWATER REMEDIAL
SYSTEM LAYOUT
ALTERNATIVE 2
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

VAULT LID WITH
CHANNEL FRAME
MAGNETIC FLOW M
FINISHED GRADE\ PRESSURE GAUGE\
SAMPLE VALVE,,
MANUAL FLOW
CONTROL VALVE
I SUBMERSIBLE PUMP V V FLOW
MAGNETIC FLOW METER y
WELL CAP \� --- ---- — d
CONCRETE VAULT D --=---- ----- —
SS FLANGE
LT WATER LEVEL SENSOR P
CASING CENTRAL
(IMATE LEVEL CONTROL SENSOF
TABLE��HIGH LEVEL CONTROL
/ THREADED JOINT
VEX
OW -LOW SHUT-OFF SENSOR
4'DUKE
ENERGY
CAROLINAS
41
synTena
NOT TO SCALE
ELL PIPE GUIDES
BOREHOLE
C SI
L CASNG
lFfl I(]INTS
IATER LEVEL PRESSURE TRANSDUCER
ELL PUMP POWER CABLE
DRAWN BY: J. CHASTAIN DATE: 12/21/2019
REVISED BY: DATE: -
CHECKED BY: J. CLEMMER DATE: 12/21/2019
APPROVED BY: W. GERALD DATE: 12/21/2019
PROJECT MANAGER: B. WILKER
www.synterracorp.com
LEVEL CONTROL SENSOR
LEVEL CONTROL SENSOR
SIGNAL FROM:
MAGNETIC FLOW METER
—'111PRESSURE TRANDUCER
INSTRUMENTATION
CONDUIT HEADER
LE
,
/,CONDUIT AL
SEALED 0PENING
DISCHARGE PIPE, T' HDPE
10 W
,HEADER PIPE
I=
NOT FOR CONSTRUCTION
FIGURE 6-27
EXTRACTION WELL SCHEMATIC
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

QN
�aBACKWASH
HH
RAW WATER
H EQUALIZATION TANK TRANSFER
1 L PUMP
LIFT STATION
LAKE NORMAN
SAND FILTER MEDIA
INTAKE
SP
SAMPLE
PORT
USED BACKWASH
TO INFILTRATION
-------------------------------------------------------------------------
-----------------------------------------------------------------------T-----------------------------------------------------------------------------
WATER DISPOSAL
0 ......................................................
GALLERY
INFILTRATION GALLERY PLAN
INFILTRATION GALLERY CROSS
INFILTRATION GALLERY
VIEW - PER ACRE
SECTIONAL VIEW
OBLIQUE VIEW
Q �
FROM SAND FILTER I >
F FROM SAND FILTER
VAULT
FROM SAND FILTER
ttt{{tttttt
Xe
zl
,
DISTRIBUTION PIPE
r}rrr}rrrrr
,
,
SOIL BACKFIL
trtrtrtr r rtrtr
r r r
DISTRIBUTION PIPE
,
X10
XG
ttttttttttt
,
ZI
�+
t tttttttttttttttt ,
,
GRAVEL BEDDING
INFILTRATION PIPE
SOIL BACKFILL
INFILTRATION PIPE
GRAVEL BEDDING
,
,
DISTRIBUTION PIPE
INFILTRATION PIPE
Not to Scale
LEGEND
HH - High high
H - High low
L - Low
Flow totalizer
Q Pressure gauge
sP Sampling port
>V<
Check valve
Three-way valve
Ball valve, normally
closed
®
�
�
I
H
Rotameter
Ball valve, normally open
Diaphragm valve, normally open
Diaphragm valve, normally closed
'ENERGY.: DUKE
CAROLINAS
DRAWN BY: T. COLTON DATE: 7/17/2019
REVISED BY:
CHECKED BY: W. GERALD
APPROVED BY: B. WILKER
PROJECT MANAGER: B. WILKER
FIGURE 6-28
CONCEPTUAL PROCESS FLOW DIAGRAM
WATER INFILTRATION GALLERIES
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
synTerra
I www.synterracorp.com

1 1
-�.e♦
r
•, . V . PRE -DECANTING CONDITIONS
` �♦
.-
1 1 `� '' r
-�.e� `
v
APPROXIMATE MODEL YEAR 2050
CLOSURE -IN -PLACE
1 1
'�.e♦ •
` . If
�� �' r APPROXIMATE MODEL YEAR 2050
` CLOSURE -BY -EXCAVATION
v
00
f
�
f
e
® 'Sam=
_
�
1
1
1
4/
Egon
Egon
o
•
a
1
� r
•
r
414
r:
elk
lk
e
It
ed
�I
d
It♦
,r.'
�f
%It
`
cum
. I I
I
a - I ♦ �
I
. I ♦
� ,
♦ ®
/
♦ ®
/
♦ ®
1
��
op 1
i
I♦
e♦
_ �� e♦
��
e♦
rY�iYf�ififi�W /♦♦
y
i..i �:
/♦♦
/♦♦
LEGEND
BORON CONCENTRATION RANGE (>4,000 Ng/L) - ASH BASIN COMPLIANCE BOUNDARY
BORON CONCENTRATION RANGE (700 - 4,000 Ng/L) LANDFILL COMPLIANCE BOUNDARY
NOTES:
1. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY
CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO BE USED
FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND STREAMS
( DUKE
'
ENERGY®
500
GRAPHIC SCALE
0 500 1,000
FIGURE 6-29
SIMULATED BORON CONCENTRATIONS
Q INFILTRATION GALLERY
— DUKE ENERGY CAROLINAS PROPERTY LINE
BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND DELINEATION CONDUCTED BY
MCKIM & CREED MARCH 2O16.
CAROLINAS
(IN FEET)
IN ALL FLOW ZONES
DRAWN BY: B.YOUNG DATE:08/09/2019
REVISED BY: C. WYATT DATE: 12/26/2019
EXTRACTION WELL STREAM(MCKIM&CREED) 2. ALL BOUNDARIESARE APPROXIMATE.
3. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
REMEDIAL ALTERNATIVE 2
CORRECTIVE ACTION PLAN UPDATE
INJECTION WELL
ASH BASIN WASTE BOUNDARY
WETLAND (MCKIM & CREED)
4. AERIAL PHOTOGRAPHY OBTAINED FROM GOGGLE EARTH PRO ON JULY 26, 2018. IMAGE
COLLECTED ON MARCH 30, 2018.
CHECKED BY: E. WEBSTER DATE: 12/26/2019
APPROVED BY: B. WILKER DATE: 12/26/2019
MARSHALL STEAM STATION
LANDFILL BOUNDARY
5. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83).
synTerra
PROJECT MANAGER: B. WILKER
TERRELL, NORTH CAROLINA
www.synterracorp.com

Corrective Action Plan Update December 2019
Marshall Steam Station SynTerra
Figure 6-30
Groundwater Remedial System Layout —
Alternative 3
Provided in separate electronic figure file as a
large sheet size

FINISHED
AIR VE
4'DUKE
ENERGY
CAROLINAS
41
synTena
PRESSURE CONTROL VALVE
MAGNETIC FLOW METER
PRESSURE GAUGE --
6" WELL SCREEN
THREADED JOINT
VAULT LID WITH
CHANNEL FRAME
FLOW SHUTOFF
SOLENOID
/VALVE
/(NORMALLY
F1Z" tSVKtKVLt
11;
WELL CASING
r
NETIC FLOW METER
AL FROM:
LEVEL SHUT-OFF SE
T WATER LEVEL S0
3TRUMENTATION CO
,NAL FROM:
NSTRUMENTATION
ELE%�/����
OPENING (TYP.)�/
RECHARGE PIPE, 1' HDPE
j/
/RECHARGE HEADER PIPE
NOT FOR CONSTRUCTION
NOT TO SCALE
FIGURE 6-31
DRAWN BY: J. CHASTAIN DATE:12/21/2019 CLEAN WATER INFILTRATION WELL SCHEMATIC
REVISED BY: DATE:- CORRECTIVE ACTION PLAN UPDATE
CHECKED BY: J. CLEMMER DATE: 12/21/2019
APPROVED BY: W. GERALD DATE:12/21/2019 MARSHALL STEAM STATION
PROJECT MANAGER: B. WILKER TERRELL, NORTH CAROLINA
www.synterracorp.com

PRE -DECANTING CONDITIONS 1 1 `� r ♦ ,
7/m
APPROXIMATE MODEL YEAR 2029 1 `N . ` r
7/m
t
f
` 1
1
I♦ ♦ �
��J'� "f I t ♦
Oman
OZER
7"o'
Jb,♦;4N,_♦;
A � ■
� ■
� } 1
• r1
,/
•
♦
•
•.
�.
100010
10
r' r I ♦ f ♦
♦
A r� r I ♦
.
♦ J* I ♦ /
♦ ♦ / ♦
♦ ♦ 1
oo
•
LEGEND
.00000,
BORON CONCENTRATION RANGE (>4,000 - - - ASH BASIN COMPLIANCE BOUNDARY NOTES:
JNg/L) 1.THE WATERS ATT THE THE US
THE ATION PCREHAS NOT HIS AP IS NOT BEUSETHE SARMYCORPSOF
LANDFILL BOUNDARY ENGINEERS RISDICTIONAL E TIME OF THE MAP CREATION. THIS MAP IS NOT TO BE USED FOR
JURISDICTIONALDETERMINATION PURPOSES. THE WETLANDS AND STREAMS BOUNDARIES
('DUKE
ENERGY-
GRAPHIC SCALE
500 0 500 000
FIGURE 6-32
SIMULATED BORON CONCENTRATIONS IN ALL
BORON CONCENTRATION RANGE (700 - LANDFILL COMPLIANCE BOUNDARY MARCHWERE OBTAINED FROM STREAM AND WETLAND DELINEATION CONDUCTED BY MCKIM & CREED
4,000 Ng/L)
CAROLINAS
(IN FEET)
FLOW ZONES
DRAWN BY: C.WYATT DATE:09/09/2019
REVISED BY: C.DAVIS DATE: 12/11/2019
DUKE ENERGY CAROLINAS PROPERTY 2. ALL BOUNDARIES ARE APPROXIMATE.
e EXTRACTION WELL LINE 3. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
REMEDIAL ALTERNATIVE 3
CORRECTIVE ACTION PLAN UPDATE
�
• CLEAN WATER INFILTRATION WELL 4. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON JULY 26, 2018. IMAGE
STREAM (MCKIM & CREED) COLLECTED ON MARCH 30, 2018.
CHECKED BY: E. WEBSTER DATE: 12/11/2019
APPROVED BY: B. WILKER DATE: 12/11/2019
MARSHALL STEAM STATION
ASH BASIN WASTE BOUNDARY ( )
WETLAND MCKIM &CREED 5. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83).
synTerid
PROJECT MANAGER:B.WILKER
TERRELL NORTH CAROLINA
�
www.s nterracor .com

INTAKE PUMP
AND SCREEN
LAKE
NORMAN
Not to Scale
SODIUM
HYPOCHLORITE
FEED
POLYMER FEED
m
EQUALIZATION
q qq TANK m
M t1
� o
RAPID
SEDIMENTATION
FILTRATION
MIX
BASIN
RAPID
SEDIMENTATION
FILTRATION
MIX
BASIN
m 0
e ox
ION
EXCHANGE
FILTRATION
ION
EXCHANGE
FILTRATION
' � I
DRAIN AND I I I
SOLIDS - — — — — — — —— - ---L—————————— — — — — —— V
REMOVAL f
I
I
I
I
FILTRATE TO I
I
WWTP
I
I
I
IN —�
I
I
I
I
PRESSURE GAUGE AND SHUTOFF VALVE AT EACH WELL HEAD
INJECTION WELLS
CLEAN WATER
INJECTION STORAGE
TANK
DECHLORINATION
ox
NOTE: PUMP AS NEEDED
LEGEND
HH -High high
H - High low
L — Low
TYP -Typical
Flow totalizer
Q Pressure gauge
SP Sampling port
Check valve
� Three-way valve
/« Ball valve, normally
Closed
®
COQ
><
Rotameter
Ball valve, normally open
Diaphragm valve, normally open
Diaphragm valve, normally closed
DUKE
tENERGY.:
CAROLIG
DRAWN BY: B. GREEN DATE: 11/7/2019
REVISED BY: B. GREEN
CHECKED BY: T. COLTON
APPROVED BY: W. R: B. WI
PROJECT MANAGER: B. WCKER
FIGURE 6-33
CONCEPTUAL PROCESS FLOW DIAGRAM
CLEAN WATER INFILTRATION
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
�%
�m Terf2
-'1 "
www.synterracorp.com

EXTRACTION
WELLS (66)
A
DISCHARGE TO NPDES
OUTFALL 002
Not to Scale
LEGEND
®
Rotameter
DUKE
t
DRAWN BY: B. GREEN DATE: 11/07/2019
REVISED BY: B. GREEN
FIGURE 6-34
CONCEPTUAL PROCESS FLOW DIAGRAM
HH - High high
E01 Flow totalizer
Check valve
CCQ
Ball valve, normal) o
y en p
ENERGY:
CAROLINAS
CHECKED BY: T. COLTON
GROUNDWATER EXTRACTON SYSTEM
H - High low
L — Low
Q Pressure gauge
07< Three-way valve
CD
Diaphragm valve, normally open
APPROVED BY: W. GERALD
PROJECT MANAGER: B. WILKER
CORRECTIVE ACTION PLAN UPDATE
�'
TYP -Typical
sP Sampling port
00 Ball valve, normally
H
Diaphragm valve, normally closed
SyrlTerm
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
closed
rwww.synterracorp.com

Submit CAP to NCDEQ (1 day)
NCDEQ Review and Comment Period (90 days)
Duke Energy Responds to CAP Comments (60 days)
CAP Approved by NCDEQ (1 day)
Implement Effectiveness Monitoring Plan (30 days)
Submit Pilot Test Work Plan and Associated Permit Applications to NCDEQ (30 days)
Implement Quarterly Progress Reporting to NCDEQ (30 days)
Permit Applications Approved by NCDEQ (60 days)
Conduct Pilot Test (182 days)
Submit Detailed Design and Specifications Report (182 days)
Review Design Report with NCDEQ (1 day)
Bid documents, Procurement, Permitting (182 days)
Installation of Full -Scale Groundwater Remediation System (243 days)
System Start -Up and Optimization (90 days)
Submit As -Built Construction and Start -Up Information Report (90 days)
Notes:
- Either submittal of the Effectiveness Monitoring Plan or
the pilot test work plan and permit applications (as
applicable) will fulfill section G.S.130A-309.209.(b)(3).
** - Actual time may vary due to a variety of factors
including agency review and approvals, weather delays,
equipment availability, etc.
Ongoing System Operation
Days
0 150 300 450 600 750 900 1050 1200 1350
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t� DUKE
� ENERGY.:
DRAWN BY: R. ISHAM DATE: 12/5/2019
REVISED BY:
CHECKED BY: S. WOOD
CAROLI?
APPROVED BY:
PROJECT MANAGER: B. WILKER
*'
synTerra www.synterracorp.com
FIGURE 6-35
CAP IMPLEMENTATION GANTT CHART
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA

PROPOSED NEW
.� LANDFILL BOUNDARY
_ . 7 , j , �... ■ , 0
t
I ■ �-' '
1 . ,
■ 1Al.,� ■
Yo -
I�.� LEGEND
lie
on
lug � �_�, •
■
w�
� • NOTES:
t
■ � � TABLE 6-21
I
1 �
i
7
■Q,
�-
• , I�'0000,..
GRAPHIC SCALE
\ • � ,`.. . �'' � �', (' DUKE ago o 490 980 FIGURE 6-36
�% ENERGY EFFECTIVENESS MONITORING WELL
i
CAROLINAS (IN FEET) NETWORK AND FLOW PATHS
DRAWNBY:C.WYATTAVIS DATE:12/19/2019 CORRECTIVE ACTION PLAN UPDATE
� a REVISED BY: C. DAVIS DATE: 12/19/2019
_ • 7 CHECKED BY: E. WEBSTER DATE:12/19/2019 MARSHALL STEAM STATION
1 a APPROVED BY: B. WILKER DATE: 12/19/2019
synTerid ANAGER:B.WILKER TERRELL, NORTH CAROLINA
f PROJECTMwww.synterracorl).com

Interim
Monitoring Plan Corrective Action
(IMP) sampling Y—>Plan Approval
Effectiveness Monitoring Plan (EMP)
monitor downgradient, sidegradient,
and background groundwater in
accordance with G.S. 130A-
309.214(a)(4)k for compliance with
NCAC 02L .0202 Groundwater Quality
applicable Standards
Based on
annual evaluation,
is the remedial
system performance
\ effective? /
No
Adjust remedial system
components; continue with EMP
or
Implement contingency plan in
accordance with CAP Update
Section 6.8.9; continue with EMP
Notes:
NCAC - North Carolina Administrative Code
02L - NCAC Title 15A, Subchapter 02L. Groundwater Classification and
Standards
Yes
No
Continue EMP sampling and Continue PCMP sampling
Annual Review and and Annual Review and
Reporting I I Reporting
/ Post -Closure Monitoring Plan (PCMP)
Post -closure monitoring to begin
Is the ash basin Yes following closure certification.
certified closed? Monitoring parameters and locations
to be determined at that time and in
—K
accordance with G.S. 130A-
309.214(a)(4)k.2.
No 1
I
No
Are the groundwater
Based on
monitoring results Yes
annual evaluation,
below applicable
is the plume stable
standards at the
at the compliance
compliance boundary
boundary?
for three years?
Yes Request completion of active remediation
or
Request completion of PCMP post -closure monitoring
in accordance with G.S. 130A-309.214(a)(3)b
DUKE
•�ENERGY
DRAWN BY: T.PLATING DATE:10/112019
FIGURE 6-37
�
REVISED BY: J. WYLIE& DATE: 12/16/2019
K. SHECK
WORK FLOW FOR EFFECTIVENESS
CAROLINAS
CHECKED BY: P. ALTMAN DATE: 12/16/2019
MONITORING AND OPTIMIZATION
APPROVED BY: J. WYLIE DATE: 12/16/2019
CORRECTIVE ACTION PLAN UPDATE
PROJECT MANAGER: B. WILKER
MARSHALL STEAM STATION
�T�a
TERRELL, NORTH CAROLINA
www.synterracorp.com

Review Cycle
No
-0
Yes
r' DUKE
ENERGY
r,.
tip
synTerra
Has t\sitebeen i
for resource /
development?
Yes — Secretary shall not
authorize termination for
groundwater use resource
development at time of
request
DRAWN BY: K. SHECK DATE: 7/15/2019
REVISED BY:
CHECKED BY: W. GERALD
APPROVED BY: B. WILKER
PROJECT MANAGER:: B. WILKER
www.synterracorp.com
Is there
sufficient \
No evidence
that concentrations are
less than 02L standards I
\ from multiple
sampling
events?
FIGURE 6-38
WORK FLOW FOR TERMINATION
OF GROUNDWATER
REMEDIATION PROGRAM
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA