NC0004961_Figures_20171031

2017 Comprehensive Site Assessment Update October 2017
Riverbend Steam Station SynTerra

P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Report\Riverbend CSA
October 2017 Final.docx
FIGURES

2017 Comprehensive Site Assessment Update October 2017
Riverbend Steam Station
FIGURES
SynTerra
P:ADuke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Report\Riverbend CSA
October 2017 Final.docx

NORTH
t �
� •�
y
ASH BASIN
`
CINDER STOn-" E
-►� '' R
.__ter
ASH STORAGE
BE
NORSEghoe`
HORSESHOE
RIVERBEND
/f."��"" -
I:
NDSEAC •Rp .
N
POWERHOUSE
�+ .a "A
r - i
qp ,�`,
"0
I I ' -
'•d
SURFICIAL
Y
WEATHERED ROCK
B O
LEGEND
AREA OF CONCENTRATION IN GROUNDWATER
ABOVE NC2L (SEE NOTE 5)
ASH BASIN WASTE BOUNDARY
GENERALIZED GROUNDWATER FLOW DIRECTION
APPROXIMATE STREAMS (NON-IURISIDICTIONAL)
WITH FLOW DIRECTION
--'— DUKE ENERGY PROPERTY BOUNDARY
VISUAL AID ONLY -
NOlE:
116vDEPICTION NOT TO SCALE
FIGURE ES-1
1. OCTOBER,2016AERIAL PHOTOGRAPHY OBTAINED FROM GOGGLE EARTH PRO ON
DULY 11, 2017, DATED OCTOBER a, 2016.
APPROXIMATE EXTENT OF IMPACTS
2. STREAM FROM AMECNRTRREPORT, 2015.
148 RIVER STREET, SUITE 220
/ �� GREENVILLE, SOUTH CAROLINA 29601
RIVERBEND STEAM STATION
3. GENERALIZED GROUNDWATER FLOW DIRECTION BASED ON MAY 22, 2017 WATER
LEVEL DATA
PHONE [phone]
DUKE www.synterracorp.com
DUKE ENERGY CAROLINAS, LLC
4. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY.
5. GENERAHZEDAREAL EXTENT OF MIGRATION REPRESENTED BY NCACO2L
t�ENERGY DRAWN BV_ ADAM EEIGL DATE_ 10/09/2017
PROJECT MANAl ER_JUDD MAHAN
LAYOUT_EST -RUSS
MOUNT HOLLY, NORTH CA RO LI N A
EXCEEDANCESOF BORON AND SULFATE.
C^Rf'�ROLI^ ^
IVf'� 10/29/2017238 PM P\Duke Energy Pmgess_1026\OO GIS DASE DATA\R
rverbentl\MapDocs\CSA_Supplement_2\3D SCM\R rverbentl_3D_E51tlwg

LEGEND j
J r
CINDER STORAGE
APPROXIMATE WASTE BOUNDARY
_ DUKE POWER RIVERBEND STEAM STATION : •�-�
PLANT BOUNDARY _
— rrl
r
ex
Gv. fi�
Ir ) J.ti
1
; .
ASH BASIN
r " � '- �� Po+■erplsnt _ - `k '--+ � �]�-"��' Cam_.
tt► ; r
r a ti I '%Vvet
t: r age
,6 RIVERBEND STEAM STATION'`
Rozxelle A f f I
Bridge t�
7'�• 4
r� 8 67 NC16' U...
i
SOURCE:
USGS 24KTOPOGRAPHIC MAP OBTAINED VIA ESRI ARCGIS ONLINE, 4
MOUNTAIN ISLAND LAKEAND LAKE NORMAN SOUTH QUADRANGLES, QUADID 35080C8AND 35080D8.
1,000 500 0 1,000 2,000
FIGURE 1-1
GRAPHIC SCALE IN FEET SITE LOCATION MAP
synTerrd GREENVIRIVELE,SOUTHCAROLINA29601 RIVERBEND STEAM STATION
PHONE 1-9999 DUKE ENERGY CAROLINAS LLC
� DUKE www.s nterracterracor .com ,
'DRD OBY.AROBINSONDATE:10/26/2017 MOUNT HOLLY, NORTH CAROLINA
ENERGY
CAROLINAS CHECKED BY: C. SUTTELL
P:\Duke Enerav Pro ress.1026\00 GIS BASE DATA\Riverbend\Ma Docs\CSA SuDDlement 2\Fi 01 SiteLoc Riverbend.mxd

LEGEND f �l
CINDER STORAGE
APPROXIMATE WASTE BOUNDARY
• 1! n
a y
HE/NECK
0 .,
A,'
o�
RIVERBEND STEAM STATION I1 C
r
r!
1 rr
f� rr
•� rr
Sub$tatio�,
��� ■ ■ a ■ ! c� I�
■; :■ ; D a Power Village
�;'
f �� * i i �■+ 111 `ljt
f� i � ■• 11
II
It
•
B E
NISGSTOPOGRAPHIC MAP, PAWCREEK, CREATED 1948. '
40 20 0 40 80
FIGURE 2-2
synTerla
GRAPHIC SCALE IN FEET
1948 PAW CREEK TOPO
GREENVIRIVELE,SOUTHCAROLINA29601
PHONE864-acOr2999
www.s nterr.com
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS� LLC
j DUKE
DRAWN BY A. ROBINSON DATE:10/26/2017
ENERGY.
MOUNT HOLLY, NORTH CAROLINA
CAROLINAS
PROJECT MANAGER: K. WEBB
CHECKED BY: C. SUTTELL

/ MW-15
•
♦ MW-03D `♦♦ ♦♦O
� M W-03S
' • M W-04 D
• MW-04S
MW-11 DR •
♦ MW-11SR� ♦ �♦
♦ M W-05 D
• MW-02S • ♦ `
M W-06S ♦
♦♦ : MW-14 J
/ / MW-10 Z � . ♦
♦ MW-01D s.
■ i.
0000
0000
♦ lAlf
/
09
♦ -
0000,
Aw
•
,.
x �
x
♦ R�� MW-07D •
•
•
i / / • %
r
LEGEND
VOLUNTARY WELL
�� � � �'• C � MW-081 MW-08D••'-•• ••—� I =_-• ••--■—•--���������♦ � COMPLIANCE WELL
1,` ° —�. APPROXIMATE STREAM (NON -JD)
°L= �� '�' - #� ASH BASIN BOUNDARY
rR', ,t, ®.;r i �� -••— COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
BOUNDARY
♦ ♦♦ . NOTES:
i f 2016 AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
♦ ; r PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
DRAWING HAS BEEN SET WITH PROJECTION OF NORTH CAROLINA STATE PLANE
/ `♦ COORDINATE SYSTEM RIPS 3200 (NAD63/2011).
/ ♦♦ f 300 150 0 300 600
FIGURE 2-3
/�� -. �♦ ` ' ; GRAPHIC SCALE IN FEET COMPLIANCE AND VOLUNTARY
♦ I f synTerra 148RIVER STREET SUITE 220 MONITORING WELLS
��■ GREENVILLE, SOUTH CAROLINA 29601
PHONE[phone] RIVERBEND STEAM STATION PLANT
• r `' ♦ s www nterracor .com ' DUKE ENERGY CAROLINAS, LLC
// • '.a=' �§+ �:�" 3 ,.:�� ,�'4. m< • �� DUKE DRAWN BY: A. ROBINSON DATE: 10/26/2017
ENERGY. MOUNT HOLLY NORTH CAROLINA
'! DRAWN
J. HAN
'` Pw� .- 1y „ i ♦{ ,'.'", I ♦ • '-AROLINAS CHECKED BY B. WYLIEMA ,
♦ „i
.. `" " �^�� � `�:x �' ' - •:� �_ -� � - ""' -'_ �: - � ° '� P:\Duke Enerov Pr ress.1026\00 GIS BASE DATAU2iverbend\Ma Docs\CSA SuDDlement 2\Fi ure 2-3- Com liance and Voluntary Monitornq Wells.mxd

NOTES:
ALL BOUNDARIES ARE APPROXIMATE.
SITE AERIAL 0RTHOPHOTOGRAPHY OBTAINED FROM WSP, DATED 2014.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE
PLANE COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
* DENOTES EXISTING OR FORMERASH POREWATER MONITORING WELL.
`f � 278.0-0.3m ❑
.y .
o
S-20 I:-
SW-3
r%
♦ ' .— - -CINDER
♦ '
FORMER ASH STORAGE
/Aw COAL
♦ ,
RBSW002 � •t;
♦ :
GATE 7
RBSW001 A.'�
r
e
k�
BG-5Sw -�
MW-15D
S-10
MW-6S/D
�B-4S"/D
AB-3S"/D/BR P
AB-6S/BRU '—Mp ;
AB-5S"/SL"/Da ft ��,
; •:'
'.
jft-8SID
GWA-23D
': ` , �•'�" ��'r� .�'�"'ate ��-4 �, ..., g:..
: ♦�.
i
ASH BASIN
AB-7S*/l/D
2BR
{ Q
15,
`ins:• ��L2
% DUKE
w ENERGY
lv.v
1� •
S-6 _ "'. 17
S-7 �� �•`
/ ; �? ❑, S-13 ` 277.5-0.3m ❑
1
S-13A
'. _�:' .'�".`.:Y! { :e "� a •. �.'.
Y
s ::u C10.:a.'f_ •.ay.:.crr.1N::�ti..�..,:��:3.�.1:?�j"i
ve
�.N �3 _ •...� - ;� ,.� ram. f RiQ .
300 150 0 300 600
GRAPHIC SCALE IN FEET
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
www. nterracor .com
DRAWN BY: A. FEIGL DATE: 10/26/2017
PROJECT MANAGER: J. MAHAN
CHECKED BY. B.%WUE
LEGEND
ASH POREWATER MONITORING WELL LOCATION
GROUNDWATER SAMPLING OR WATER LEVEL
MEASUREMENT LOCATION
BACKGROUND GROUNDWATER MONITORING WELL
LOCATION
ABANDONED MONITORING WELL LOCATION
2017 BACKGROUND SOIL SAMPLE LOCATION
SEEP/AREA OF WETNESS (AOW) SAMPLING LOCATION
❑
SURFACE WATER SAMPLING LOCATION
APPROXIMATE STREAM (NON -JD)
WASTE BOUNDARY
• • COMPLIANCE BOUNDARY
• • DUKE ENERGY PARCEL LINE
FIGURE 2-4
SAMPLE LOCATION MAP
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

SEWAGE TREATMENT SYSTEM -
ELECTRICAL STORAGE
BUILDING
LOADING DOCM•I
USED MINERAL OIL TANK
LFUEL OIL TANK
COMBUSTION TURBINE -POWER
POWER HOUSE
CABLE TRAY
} GROUNDWATER REMEDIATION SHACK
JET WAREHOUSE
r. INSTRUMENT HOUSE\\
10C COMBUSTION TURBINE -
-41C COMBUSTION TURBINE -
11C,444T-RECOVERY STEAM GENERATOR
9VH�A,T RECOVERY STEAM GENERATOR
j MAIN FUEL OIL TANK
I(I
LARK MAINTENANCE
lip � CENTER
III 1 / I I
\ I\ c
0
9C COMBUSTION
TURBINE
DOUBLE WIDE TRAILER
PRIMARY ASH
POND rA
r A YARD SUMP PUMP LOAD CENTER
•4
} j YARD DRAINAGE SYSTEM
l I >.J' �Ij Ijlj I Iljl
):1 1 I I I III I
K \��\\ lyjll IIII I IIII
\�\\ III'llll�l�ljl�lli,
-
�NE '— YARD DRAINAGE SYST M
�10E ASH BASIN
O vER DISCHARGE PIPE Ill lj I'Ij I IIII II PRIMARY CELL
OVN� PotG�
INTAKE CANAL
ASH SLUICE PIPING \\
D02ER FUELING STATION \ /' •`�/! STORAGE
TRACTOR SHED I I I I \ i \ --
J__
LOCOMOTIVE FUELING STATION -- — — — — _—
OLD JUNCTION HOUSE
OILSTORAC\E HOUSEI II I iljl/ i /ia �I I j / ���i<i�ii� iI�1l�I
FORMER COAL PIE
NEW CRUSHER HbUSEt._
COAL TREATME'NTBUILDING
SHIPPING CONTAINER
COAL LOWERING WELL
OLD SAMPLE HOUSE 'I'I / /// / / /' / -� i-/ / / I I \I •! \\ I
f..
UPPER "y ,
WAREHOUSE
_--OLD CRUSHER HOUSE
LOWER WAREHOUSE .v
= 8C COMBUSTION TURBINE U7
Ug CAR DUMPER BUILDIn
�—COMBUSTIQN POWER U9
TURBINE HOUSE Uio�' SULFURIC ACID SYSTEM
MAIN GENERATOR
STEP-UP AND AUXILIARY UREA SYSTEM
TRANSFORMERS '
100 kV SWITCHYARD
PRECIPITATORS p
ADMINISTRATIVE BUILDING
MAINTENANCE SHOP Qj
RIVERBEND BREAK ROOM O�� WATER TOWER
INSTRUMENTAND
STEAM STATION GUARD SHACK CONTROLSHOP �BACKFLOW PREVENTER
�� 0�. �•�I ,\ //_�
MICROWAVE BUILDING �t�5� WELL HOUSE
RELAY HOUSE
DISCHARGE STRU'C1NURE
\ r
230 kV SWITCHYARD
DISCHARGE CANA
6i4
\ �-
t \\` \\ ,, 111jIII // \

E
'00
7 �f
O 0%
CL
0 60%
L)
5 IDS
4 0% �
c,
0% �
Volcanic Ash Shale Fly Ash Bottom Ash
i ■AI Fe Ca ■other Major Elements ■Minor Elements ■Trace Elements
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.
NOTES:
1. FIGURE WAS OBTAINED FROM THE EPRI COMPARISON OF COAL COMBUSTION PRODUCTS TO OTHER
MATERIALS — CHEMICAL CHARACTERISTICS, FIGURE 3-1, PG 3-2, EPRI, FINAL REPORT, SEPTEMBER 2010.
rM
�
ELEMENTAL COMPOSITION FOR BOTTOM ASH,
FLY ASH, SHALE, AND VOLCANIC ASH
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
3-2
GASTON COUNTY, NORTH CAROLINA

1000
_ 100 �
.J
CID
� 10
C �
0
0 CI
G.= e
� 0.00
0.000* .
0.00001 /y
As Ba b Cr Pb a Ag
rfaxim.m 9n-. Flemer- %e Element
TCL P Rag �l story LIB T II1
10tr RA'{e11tiI4
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.
NOTES:
1. FIGURE WAS OBTAINED FROM THE EPRI COMPARISON OF COAL COMBUSTION PRODUCTS TO OTHER
MATERIALS — CHEMICAL CHARACTERISTICS, FIGURE 9-1, PG 9-1, EPRI, FINAL REPORT, SEPTEMBER 2010.
r
IV
COAL ASH TCLP LEACHATE CONCENTRATION
VS REGULATORY LIMITS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
3-3
ASTON COUNTY, NORTH CAROLINA

NOTES:
1. ASH BASIN, ASH STORAGE AREA, AND CINDER STORAGE AREA WASTE BOUNDARIES ARE APPROXIMATE.
2. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
3. CMP IS ASSUMED TO BE AN ABBREVIATION FOR CORRUGATED METAL PIPE. HOPE IS ASSUMED TO BE AN
ABBREVIATION FOR HIGH DENSITY POLYETHYLENE. CPP IS ASSUMED TO BE AN ABBREVIATION FOR CORRUGATED
PLASTIC PIPE. RCP IS ASSUMED TO BE AN ABBREVIATION FOR REINFORCED CONCRETE PIPE.
4. UNDERGROUND FEATURES PROVIDED BY STANTEC AND DUKE ENERGY.
S. PIPE LOCATION AND LENGTH SHOWN ARE APPROXIMATE.
SCALE (FEET)
/00' 0 /00' 200'
/" = 200' I=)
LEGEND:
ASH BASIN WASTE BOUNDARY
1500 FT OFFSET FROM ASH BASIN WASTE BOUNDARY
- PIPE SEGMENT
ASH BASIN UNDERGROUND FEATURES MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
N
DATE
AUGUST 2015
FIGURE
4-1
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.
Note: The compliance/waste boundaries shown on this figure pre -date 2017 revision. See Figure 2-1 for revised boundaries
GASTON COUNTY, NORTH CAROLINA

41
Pt t ti w ar a
DER
DER
IWO'
a AGE DIAMETER CMP
ASIHISTORAGE
00
18" DIAMETER RCP OUTLET -UNKNOWN ORIGIN
�/ gyp, �f' �•?Sr�.�krr-Y Y' '�' r' � � ;�r� Fi'•, _
kF
4 Ilk
r t�
�• r �I _ f � 's t , y 't^s-. •�'� :f': Sid � ^ ' ,'{.,!'
Fri :r:-
/-!f :f. '7-•, !!�� :1; i'= •f nJ'•1•- .: t. S..+ ��
J.C• ' 'r I. r.� r - .. yti. -.[�� ai ti _ �'fr..� 2 _. �-_ _ �I t "�14' L •'� �l �7 f''�' •. }r.� .�:Y J.�.
NOTES:
1. ASH BASIN, ASH STORAGE AREA, AND CINDER STORAGE AREA WASTE BOUNDARIES ARE APPROXIMATE.
2. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
3. CMP IS ASSUMED TO BE AN ABBREVIATION FOR CORRUGATED METAL PIPE. HOPE IS ASSUMED TO BE AN
ABBREVIATION FOR HIGH DENSITY POLYETHYLENE. CPR IS ASSUMED TO BE AN ABBREVIATION FOR CORRUGATED
PLASTIC PIPE. RCP IS ASSUMED TO BE AN ABBREVIATION FOR REINFORCED CONCRETE PIPE.
4. UNDERGROUND FEATURES PROVIDED BY STANTEC AND DUKE ENERGY.
S. PIPE LOCATION AND LENGTH SHOWN ARE APPROXIMATE.
SCALE (FEET)
/00' 0 /00' 200'
/" = 200' I=)
LEGEND:
ASH BASIN WASTE BOUNDARY
1500 FT OFFSET FROM ASH BASIN WASTE BOUNDARY
PIPE SEGMENT
ASH STORAGE AND CINDER STORAGE
UNDERGROUND FEATURES MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
4-2
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.
GASTON COUNTY, NORTH CAROLINA
Note: The compliance/waste boundaries shown on this figure pre -date 2017 revision. See Figure 2-1 for revised boundaries.

,t- Th•�/ ���,: "��' L.>-�\"�'�`� �,. � ��� ��(�� �, � ,',•,►;;1.�L � ,1 i�/`' �� , ram_
D u ` =� �- r . �� _ - - �✓ � �` s \- 3f �> 1,� ,� � I Sit .� w n • ' - - - -
d Cb
`p
� �� ' I► i' \ ♦ - -- - - < Vet, 'a
t a
t r J� -/ � o G
_ T l�� 1•t`��\v _ _f� ,� �' \ �' ♦ �a� EKE COVE RD rz .
O N E C K (SECONDARY �1� ~ } R� • ••~
CELL) �' ''! •i a '
ti, C3` � f y / / I 1� �`./ •..BA1 1 Y4) mac/
SIN rlti ) t c`
(PRIMARY
vyof CELL)
CINDER _ h� IIG ?+
STORAGE
w AS
&0 � ��~ � `� � --)4�>/ Power n STORAGE � 1 ��1 r C � O
�NSp ��� F t •: ' - _ _ �I F10RSESHo ` / / Q �--.: ` • -
�'O� ♦
H
,kr RI V E RB EN�3
'
f
STEAM at TI i M
�o ♦ -�� STATIONFRO
N� .•.: ♦ , ♦ (gyp ` C J 2 w' — G� ,.+_ \p •_�.
• �. ; ooT� 5 w �_ CID
DUKE y T r �R Legend
�h z
MBE�' DUKE ENERGY PROPERTY BOUNDARY
- `
? m 90� m w "INEN ASH BASIN WASTE BOUNDARY
~ ♦ O I �— Y I ES m
��, CO �, U' ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN ` `�0� . •�..e <' •e `1 ], n V Q UT 1 CO NCIIDENT WITH COMPL(ANCE DUKE ENERGY BOUNDARY
t• f
s •b s>''' �. •:� i _C 11 r� m FO ~ U� A . m Jtti PROPERTY BOUNDARY
A GE , ` \; ' 0.5 MILE OFFSET FROM ASH BASIN
j ' COMPLIANCE BOUNDARY
- STREAM
lo
•�
NOTES: SCALE (FEET)
1.ASH BASIN WASTE BOUNDARIES AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE.
2. PRIVATE WELLS LOCATIONS ARE APPROXIMATE. 500 0 500 1,000
3. USGS 7.5-MINUTE SERIES TOTOGRAPHIC BASEMAP COPYRIGHT:© 2013 NATIONAL GEOGRAPHIC SOCIETY, I -CUBED
4. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a).
5. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS LAKE NORMAN SOUTH, NC AND MOUNTAIN ISLAND LAKE, NC -VA.
6. DUKE ENERGY PROPERTY BOUNDARY WAS SUPPLIED BY DUKE ENERGY REAL ESTATE.
7. INFORMATION PERTAINING TO IDENTIFIED WATER SUPPLY WELLS IS INCLUDED IN TABLE4-1
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.
Note: The compliance/waste boundaries shown on this figure pre -date 2017 revision. See Figure 2-1 for revised boundaries.
■ SURFACE WATER INTAKE
p REPORTED PRIVATE WATER SUPPLY WELL
USGS MAP WITH WATER SUPPLY WELLS DATE
DUKE ENERGY CAROLINAS, LLC AUGUST 2015
RIVERBEND STEAM STATION ASH BASIN
FIGURE
GASTON COUNTY, NORTH CAROLINA 4-3

NOTES:
1.ASH BASIN WASTE BOUNDARIES AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE. SCALE (FEET)
2. PRIVATE WELLS LOCATIONS ARE APPROXIMATE.
3.ORTHOPHOTOGRAPHY IS FROM NC ONEMAP GIs ONLINE SERVICE. 500 0 500 1,000
4. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a).
5. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS LAKE NORMAN SOUTH, NC AND MOUNTAIN ISLAND LAKE, NC -VA.
6. DUKE ENERGY PROPERTY BOUNDARY WAS SUPPLIED BY DUKE ENERGY REAL ESTATE.
7. PROPERTY BOUNDARIES WERE SUPPLIED BYTHE GASTON COUNTYAND MECKLENBURG COUNTY GIs OFFICES.
8. INFORMATION PERTAINING TO IDENTIFIED WATER SUPPLY WELLS IS INCLUDED IN TABLE4-1
F)l
Legend
RECEPTOR MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
COINCIDENT WITH DUKE ENERGY
PROPERTY BOUNDARY
0.5 MILE OFFSET FROM ASH BASIN
COMPLIANCE BOUNDARY
STREAM
PROPERTY LINES
REPORTED PRIVATE WATER SUPPLY WELL
DATE
AUGUST 2015
FIGURE
4-4
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.
Note: The compliance/waste boundaries shown on this figure pre -date 2017 revision. See Figure 2-1 for revised boundaries.

SCALE (FEET)
500 0 500 1,000
NOTES:
1.ASH BASIN WASTE BOUNDARIES AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE.
2. PROPERTY BOUNDARIES WERE SUPPLIED BY THE GASTON COUNTY AND MECKLENBURG COUNTY GIS OFFICES.
3.ORTHOPHOTOGRAPHY IS FROM NC ONEMAP GIS ONLINE SERVICE.
4. INFORMATION PERTAINING TO IDENTIFIED PROPERTIES IS INCLUDED IN TABLE 4-2
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.
Note: The compliance/waste boundaries shown on this figure pre -date 2017 revision. See Figure 2-1 for revised boundaries.
F)l
PROPERTIES CONTIGUOUS TO
THE ASH BASIN WASTE BOUNDARY
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
4-5

NOTES:
1. ASH BASIN, ASH STORAGE AREA, AND CINDER STORAGE AREA WASTE BOUNDARIESARE APPROXIMATE.
2. ORTHO PH OTOG RAP HY WAS OBTAINED FROM WSP(DATED APRIL 2014).
3. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS MOUNTAIN ISLAND LAKE, NCAND ON -SITE OBSERVATIONS.
Source: HDR, Corrective Action Plan Part 2, Riverbend Steam Station Ash Basin, February 12, 2016.
Note: The compliance/waste boundaries shown on this figure pre -date 2017 revision. See Figure 2-1 for revised boundaries.
SCALE (FEET)
200' 0 200' 400'
P - 400' I=)
SURFACE WATER BODIES
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
4-6

e
�• i
r7S�'
iw
be-
- ccam.-.• ~ n� �L�
\ - y
Y.
._ .' ._ w '
�Z/
.a
.
4
-
IN
- :go-- '..r-- ;e--- .. ��a:' ,-, - : * _ ;-'�- ':tia-;•:
NOTES:
1.ASH BASIN WASTE BOUNDARIES AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE. SCALE (FEET)
2. PRIVATE WELLS LOCATIONS ARE APPROXIMATE.
3. ORTHOPHOTOGRAPHY IS FROM NC ONEMAP GIS ONLINE SERVICE. 500 0 500 1,000
4. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a).
5. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS LAKE NORMAN SOUTH, NC AND MOUNTAIN ISLAND LAKE, NC -VA.
6. DUKE ENERGY PROPERTY BOUNDARY WAS SUPPLIED BY DUKE ENERGY REAL ESTATE.
7. PROPERTY BOUNDARIES WERE SUPPLIED BYTHE GASTON COUNTYAND MECKLENBURG COUNTY GIS OFFICES.
8. INFORMATION PERTAINING TO IDENTIFIED WATER SUPPLY WELLS IS INCLUDED IN TABLE 4-1
Source: HDR, Corrective Action Plan Part 1, Riverbend Steam Station Ash Basin, Novemer 16, 2015.
Note: The compliance/waste boundaries shown on this figure pre -date the 2017 revision. See Figure 2-1 for revised boundaries.
a:
Oil- r5(.
r.
.I
+ Legend
— DUKE ENERGY PROPERTY BOUNDARY
' _ } ASH BASIN WASTE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
COINCIDENT WITH DUKE ENERGY
PROPERTY BOUNDARY
s"
STREAM
_. R• C DISCHARGE TOWER
�Y h MUNICIPAL WATER INTAKES
1
z r_•�. RIVERMILE
MUNICIPAL WATER INTAKES MAP DATE
DUKE ENERGY CAROLINAS, LLC NOVEMBER 2015
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA FIGURE
4-7

Tectonic Map Explanation
rNOT-. Su Ssdrface conrinuagorr aIferranes shown in Nghfor shWe d same cobr)
Triasaic-Jarassic gasins
l�ikw9�ir Fan�w ��
Igneous Racks
-990.
in Ah dkeS ssrs, d ftc s
11hiftg 4f vMy4-7i
785•Y6311h Qren6ordplrrani
475-YBS +Ih pnnRvJdplvonr
Armen af. �hi7
150.727 kh Qranl:erdp Pdo l
'AredM ate [/1 relf
®
3$0.$56 AfA S='0lyplye-
'Arnienape o.Hl)
u
iT0.ePM.phlon[
Lik.)y Wdavfd.n p/monr
rno.Q/ dalvSl
-0-1:1ar
pfpm-
Aroden apr o.te:l
GrWnsfer».ra—pItreHiv
fhrevr "X's r F1 P'Ao•kHnJ
are WORD..n.c Mrenef
.l
mdrlea- 0nf} Erb.P1dp o 1rs
s 0wn-1-1.&. C.reclir F.. (YA) i
NIIhbH G.wnitw&,A
-VJwmr/Acrodre
N.lpnramzadc N Wdo•kfI )
_700-539
Ah .rc-nl.lad gan4oiie
rC-4w.+up.rrvn t
I-
"735 Ah ria-,de fed . *.rc p w—
!Farod,drfng 1f Bodrrfal
Laflrentfao Platfornl
B Rifted Margin
Clasre �Jcrrgi�s
A0e4ha rfae 00S$654 l ft
Acedl.r erd Af--lore
?{Lail.
w1* AISSkappinl
AedW tbvonlat)
rrlaep[ rr.r {aL„aJ
0 F4Ss(; rtfar4. Erie $rete
nary 4&e3aNkp4nj
© toyy Dan F°m*rOCR
pVlddle 0-71) .IpFT
m nr.r°nr.Ary
ea,.ar ram—g 1. k..d
carlen.w m.rQrncl.stM.rN
avn.rr ..As
+klnd —CO. eueres MR
equrehnra (te.epnr.,.arrc-
Fe,yr unwrraa,7
Qw.e firer-V g.l to-I:r.r wynA+rgxy
Tararfar.
NaRlns6rf,Q" rfra
Ca•a d.0 ro Lh-CIIhndvvgyJ
©SlowfgnSvwN-Rb:kneff
Vrnera. p1oA'rlfp•vd+} syadAre n e+la .T'JdrPl
'L1sAvfrr>-lfardeleJ
l�v.cprv. it ro ordnvrr.,(a, ro.k.
a/ bin IievJbysyyrrclrra Illcfrdas f7w•nLM1Nr
wtlr3r.SSrbwS FarnrNatsl
PIdf�Or't7 r�p;i{5
�embrirr-0rovH:far
:ra_ua b urb�nae
V"P14% raxoc-F.rry Cm&ien
:Le11r c wleerrle mdrs.Inevrdls
9eNmcre enane.
'jlllrrrle d crkn.wn rrfnd�� fn rwndpra
n Grr.vprck[ye e..renr, 7.Q.00 b.nna
and Srlretlwa AfNrrr� ire Aa:rtdrr
pufrMPuntarn WladawRleCFs
© w.b,n.rpA—d eelyedc pf.rrrr.r(7) :P—
r.ar-r GAbrsAwrlrrfrrtldrs
Basemanr RacrS aAA RWp� .rd —1 r
01.rnxnr 0CGh/w.n.r-lln+rl be ev AM
Pb+/ow".J
-rhuT A.wlydkirrr bra daAw
Ghurr�lFlle lydfcdad by darker reC.
_ r.d Sa If.n 1+Jr lar.av
Terranes Accrefed
During Taconian Events
{Laurrn fan arrdrify, d6ral, dg�p-wPicr C�ep�sl?sJ
Naalhurg cam�pleJr (Hcf
4:4Vf S."Ir and vrstvsfrum.s ddwp-rarer, disl+f maryn
Wsfcs and tlCa.bowh! fe.uehlA FcrmAAlfrpAM Arld �l bfMeruit =.. ria
talfer+t! Ylr fe1 eye•'SrpVR /ydnk slvo-+nrj
[eWrap byrM Ar ynlbA+.g Femarian fnNN drs greet ne bsi
M1cirs s7unrjent d.sie Cecalira Fnlnllio! mIh[ SE
Westminster terrane
Q+.e00•01PraI01VC► a')af.Asrldr. ormrrclsn e.prsm�n
wlcwflm- Seta[ mwy rarrA0A01rr ems• vefcnic.
Dahlonega ydd tIa
I...W-w—f bA.A1krdh OW.O.Mr r. drc
, n*vwwa f. +w7RaV. rr vtkaalS+•, ,+1n.r r /5 9. ry1
t.srme�r sedmnr.,y caA.yoRtnf •s•voC.dc. Lvrtalrs
Ceo-rar:,rc.na ad paa rlbn Gonawaran w 7entke+. Array.
CowrPCF tarrene
0 rleoprclpraoklCempYan etaftrc de�w'liw. Whlofrtk d
•e/ 17F� mlrer'.TSpa'7J ..armme. S.ermme.•y mrnJeranr
eaa rnhenc. Midde erd-10— F nOR pOew.
depCarfoageChay$ terrart$
xequernreeercfGamyr 7J :7.f Nr —I" ten pph-1 I I G.
L'Ifrm.'rc eerrrplvlesj d —P.—f voh.rnam mrrwr r I G.
a.annenr- ied'msrr..y camawrrnr.vdr..ir.
Terra.nes AccreW During
heoacadiarr to Aliegbanian Events
jdlafal, deep-wa rdeposlfx
endsrc-fo-ik+f]RB 7okadcsl
Cat Square rer7eAe
Aftr.dt.cradlar. a AraamSn .Mrr�fy-
polf-tJU Ifa dvpvclfott. minor [rceaaf(]P8 .olpnhs.
Te.'p�ratoa (MJtan-potamae-Yhr7arralpyhra erare
D1arast +.v ia•. rvroplotaor.+c1^a,.brlm-I.Idpfly �oorrr. hl.
depeariw a WW-4m, mreer r.9. b na .l O'e
picw keardf—r_C me'eneea.a6,mm�rareorcfeA
l.rora. sedrnerrerr crmpvnenr» rlcrnic
Srwh River alMchthon
Ho-lprcrerv:dc raelasetirrnenyy'' and ncov 0 arfr
ks; Only rcf.. pfrraes. N.yh.•e L.umnfran Ind
Port-Gxrwar. n prwerrnoe.
Kings Noantair. (HMr terrane
Ara.dL.cradl.n a Av.annn .mnly.
1w>prvfanxdr fa C.M[tf.rf 71 dap acr wr h (.nr.n fh„
.1! fry; arc verC.of-"S d pu+-Goa+rl w.ran a.}rn!!y.
Carokne superterrine {pen-Gondwanar)
cwnJ1.. nrm.
Suer/rrusfpl'!ow Qndv, canpane', f s
nreapp 1.ro+oe oeppccSr:nn Andarcvoa:ertsm
ro •7rdnivlelan (7J depo srlor
llllllll CArrMte Nmne
Inhacnlsfal(rrgh grde r°nperleArs
Neapntvrordc mpcs- nlnderrvokensm
er.Insw-rh (Charleston) ferraae
rtocksorarQtry mfmoA•A mmwydva
an! pm velerce dhtrry Ferwv.dAaananl
Wigg'ns-Sdwanwe sylvre
OAn7pglanl+n eelamplMn al>Krred by hlrM r'lNrJa
/ d altloa o' Sn.sdc-Jwasaf.- 90 "g N a !M ortA�aerQi[b+sin 1.1ns E.rf Casa! Arerrth
Arrrmlly.
Suivi7nee ferrane iGendwanan rarovenancV
(Inns andcaRfigo tionsarfer rhemas. 1969)
Ord—i.a-De J.•+ eedAaenlvyrtldl
rvelpro femrdc• Camb'm- Inf3P-Wr O'lic'Prss
0 Swrpp"ie'rniac avpc`iion end rol�..+am
ra Jr�vlCfan deFtls•IlDn.
Mfddh Pnrar+zdr Fokdhhz b.s.nv.f aad
A Mc rlf7J—Ir mt.I Awi-rrhns,.
o a TN KY 37 84 Z• ��
4t� 39
fl` �� �CI� y _ rrarnkl GA 7N •� _ + why q N YorkKC
Nobpmd �
7 A WV
--------�
`i.' • =t11.� _ 40LwV
r�4,
! V
LP
\\ VV 1 ♦ L.i...............
d=_a�t`1b�"�' <_ redrrlonr
_.ems` _�'.`�� r+%_;a�rY _•.d f�+ • 1w r' �
.� • _•-re _ �'�� _..��• •�,e.y•,�� - y � tier � y �
'�-b:�`�-a.�w�. ``` __� � Yv�aY� r_ _.ai �. t •tea ��
FL+ GAi 'j+ tc':N�-' ~R e r r �a RIVERBEND STEAM STATION.
�._
y*rtr1F ; ,rr .L ,r G • ` � �.`� � � � `� . ''l ® to pre
Cl-
ie , , 1i _ _y.•_•• x+;� - - ± �kaFa *� 4= -- .---fRQ gob r Pic
A.
t - —
1 � �' V v �•• ti 6-
31' _
79`
F N 78'-
29'
D 100
q kilDrneters 100
miles
1
joe
NOTES:
1. HATCHER, R. DJR., BREAM, B. R., AND MERSCHAT, A. J., 2007, TECTONIC MAP OF THE SOUTHERN AND CENTRAL APPALACHIANS: A TALE OF THREE OROGENS AND A COMPLETE WILSON CYCLE, IN HATCHER, R. D., JR, CARLSON, M. P.,
MCBRIDE,1. H., AND MARTINEZ CATALAN,1. R., EDS., 4-13 FRAMEWORK OF CONTINENTAL CRUST: GEOLOGICAL SOCIETY OF AMERICA MEMOIR 200, P. S9S-632.
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.
Abbreviations and Symbols
.�-+Rv,n.d,mwra+ll
HB.-9/irfwAn e/AA wildev fcw
AI-A+np rfJA1
A•-+rwd.I.m+uNf'./r
OA°w •OopRrvr.fnera. rN.daa [AA-�.rl
Ae- A.y.rN. huh f3A-SCl
N. r+n.-C/rr.v hM r,mnfG/-!rl
ce,M•-cr.,rew+n unmw..lu�wf•fC7
A, -A r.un pA�Q
rob-O+xanv. �w—A ew-c %
rav-Nwry/row w-df"
GW
BN-m.Ansr. hu•IGn1
9F-B..r/eh l3rryrwhfA[-GA
-a'+rn,a•PFw•W�.N.
Lc.-Lm.a;vn. c—wiMev r7.j
41:- apffmr/.Ow R—'HF5vp
kY-.Irp. Nau—b
a-abw+fn CfryMncbw i7M1
GFV•:rad/orFongA�Mlmrrc. M1un Nc+
/R-ainr RfdY. rru.rrrlr
tone (S!-(4Nlj
-N —H•pr (Nc.
CO-Crenhr GN+fwru+lr.l+w (Gi-NCJ
T.+wy
Fd-r.e,fh1—tla.-frAl
SL`A- 5 x+efrWrr.al AWrdaA lrl
Q-OmrrMlwh
WC-W.a ChArlam
Skh-S.wlowr Av..,.r.'na rkl rac]
(me)
Ord YNtiew FNl hub frUSr:1
4'PAl
Hm-WifrNnp+m,omN•+of PI
4.
tcx-rrr/deecar. Cew c/re rew
�.-Gwfiecl rwn rA. u
w- frn+mr. rr.rv..r raq
r•d w.r cew wkeaw rnq
gV-
r c-rAe,f. +or rrvry
+d-H.r..upr Avd!'+ec.dys.+,wr.J raMMP
n2M re.,..... fe,n u l...... y..vA
bona Rf rl+.+u
/fw_ rdan.. /roun.fn 5—)
,wra.r of M A. ne yaae ele or
TNAN-VA
f/fl h.n lhu�M kun ��
� +ero• uAau.rneev.anr
xwa -xvy[ Uwn.in anv.'ren fnF&,7
LF'- I.a.rNlr F.h Iw;7
Mehl IhNOAwup
Y9- ofarfer rrdl frK-SrAYCl
1
=JCaIC �upsa+r Rl}rmper �er,eur.
�w+11
NO-luWaah [re+l h,rt (NC -WI
PFHY- PN..a+r On.>•nwnrryryM
~�— 'hrrnr l+lR
•''
••In—pednan'Swe
lY r.hwrrrn. ra-YDI
N-
r•N-F.y[ift wm Or(-. —t d 9n1e1. f"BW
rern+r 1,un
RFn - eo[.•wr1 rfrr.. soea'PAI
raea+r dS.w'. Srk
Y'o•f�l c.r+rrd hamr
SF- Sx pr tart r+,b rhGJ
„
.• ••' '"•'•••••" ,A_Fl r.. WJ�.-k'd
ivw
cnrmrnor, dl.
SN'- JPr Mw l.wr(;"q
SYf-Sry,rrpnw+.Af .m I.-(duA[J
F-A6A)
r.crn••..w..v-n.-
2 iyvaNnY Viv.IN,r+rA[-PA/wNrl
�
Fi.A•fHr Arlrld A.m
'�N/r+'.r anM*en
SR_8aa�r xinrA..fr fi+feC1
SW-Smnr W.I hw hW fA_-Gil
Y9 _ r.Nor ttmclw. d.v.rf�l
^7..--_.."N 1pae.lard irA.ry •.rexntl
fAaruN Giant•av//rtw.nr
SE.F rNofgnun .�[,r.
SEe/fr..W.r4N nr[rN .Mat ryC-fCl
r
J- — — — — — — — — — — —
77.e
76' 33' 75° 34`
TECTONOSTRATIGRAPHIC MAP OF THE
SOUTHERN AND CENTRAL APPALACHIANS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
5-1
GASTON COUNTY, NORTH CAROLINA

r�7•e 1Y3� �P y4 � I' P � "+41 ] •w 7 �,s + _1�r�+ p 'vy. �'.'. aa�ij� -�.... �
r�, J t
IN
e ,
i � gyp, _. -'�J,' i=1•�� � '�'P:� •,�',� .y� � ^!1N .i t r�r• °
EON
Lake Norman ri , i:: i F
r' .r �' � : L•r��ln1 4. ��� � :. � �' � . f :i �,.d�nl�, •_,�.�1, � _ . �..�. . r �}�"r
Riverbend Steam Station :� ; •, � �;,.,-: 5
�. Property Line
'" ,. , h".
f� - `��' •- `i'"'=�5" �.:�Y>+Mountainrlsla'n'd Lake ti
b -
WAD
•4- ^ yt
`,1 . .� - Fly •s � 1 �� � � ��� .r-.,.^r. .. .,�. �j� � r i.
. 1'T � _ - � •�� ,.�„ � n f F:�i : jJri. r `yti 'C
yr r � V��J i� y r.� ��� .. 'f � �Jr 1 •�\� .�_Y.1:'���i pp � -
,try;;' — •i \• ,�'. ���r!r°�i'.;!!':+t (.,°� :� ��f �H.� r° �w'
. - .. ..
' J.` 145 .-0
i•"• r. - f f
r �S
is f
m d Metamorphosed quartz diorite
�a and tonalite
Notes:
Source: Geologic Map of the Charlotte 1 ° x 2° Quadrangle, N;l✓,; ' ` t+
North Carolina and South Carolina, 1988, R. Goldsmith,
D. J. Milton, and J. W. Horton, Jr., USGS. iy�A ':��r �• -`. �; y�c.+C�'-� � -
rti +
SCALE(FEET) �d� �rfl`s•'.; t� ��
5,000 0 5,000 10,000
REGIONAL GEOLOGIC MAP DATE
DUKE ENERGY CAROLINAS, LLC AUGUST 2015
RIVERBEND STEAM STATION FIGURE
GASTON COUNTY, NORTH CAROLINA 5 2
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.

SOIL
Regolith
ZONE'
unsaturated
zone
Water table
REGOLITH
Regolith
RESIDUUM
saturated
zone
TRANSITION
ZONE l
WEATHERED
BEDROCK
rV
f�
UNWEATHERED
BEDROCK
r
phi �
FRACTURED BEDROCK
*
SHEET JOINT
/ r
! ~f
� I
BEDROCK
'
STRUCTURE
I�
FRACTURE
ti
1 �
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.
NOTES:
1. HARNED, D.A. AND DANIEL III, C.C.
1992. THE TRANSITION ZONE BETWEEN BEDROCK REGOLITH: CONDUIT FOR
CONTAMINATION?, P. 336-348, IN
DANIEL, C.C., III, WHITE, R.K., AND STONE, P.A., EDS., GROUNDWATER IN
THE PIEDMONT: PROCEEDINGS OF A CONFERENCE ON GROUND WATER IN THE PIEDMONT OF THE EASTERN
UNITED STATES, OCTOBER 16-18,
1989, CLEMSON UNIVERSITY, 693P.
INTERCONNECTED TWO MEDIUM PIEDMONT
GROUNDWATER SYSTEM
11 DUKE ENERGY CAROLINAS, LLC
4W RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
5-3

_ eP
Sl ape Aquifer Boundary and Topographic Di3:.Iide
- - - - m Discharge Bowidary
- - - - - Compartment Boiuidary
................ � Tater Table
Fractures
(37fotmdwater Flow Direction
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.
NOTES:
1. LEGRAND, H.E. 2004. A MASTER CONCEPTUAL MODEL FOR HYDROGEOLOGICAL SITE CHARACTERIZATION IN THE
PIEDMONT AND MOUNTAIN REGION OF NORTH CAROLINA, A GUIDANCE MANUAL, NORTH CAROLINA DEPARTMENT
OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY, GROUNDWATER SECTION, 50P.
rM
�
PIEDMONT SLOPE -AQUIFER SYSTEM
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
5-4

mqd
mqd mqd
..
.. o
o e
. o —
o e o 0
LID— _
�.
ya
Metadiorite �. ,,,, a,..,:n uaxnq
v wa�
MO UNTAI/N ISLAND LAKE
NOTES: SCALE (FEET)
1.ASH BASIN WASTE BOUNDARIES AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE..
2. ORTHOPHOTOGRAPHY IS FROM NC ONEMAP GIS ONLINE SERVICE. 500 0 500 1,000
3. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a). p
4. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS CHESNEE, NC -SC, AND BOILING SPRINGS SOUTH, NC -SC.
5. DUKE ENERGY PROPERTY BOUNDARY WAS SUPPLIED BY DUKE ENERGY REAL ESTATE.
6. BASED ON GEOLOGIC MAP OF THE CHARLOTTE Tx 2' QUADRANGLE, NORTH CAROLINAAND SOUTH CAROLINA(GOLDSMITH, MILTON, AND THORTON, 1988) F)l
7. SERVICE LAYER CREDITS: NC ONEMAP, NC CENTER FOR GEOGRAPHIC INFORMATION AND ANALYSIS, NC 911 BOARD
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.
Note: The compliance/waste boundaries shown on this figure pre -date the 2017 revision. See Figure 2-1 for revised boundaries.
N
Legend
GEOLOGY
(DScgb) Gabbro of the Concord Plutonic Suite -
Gabbro, norite, gabbronorite, and hornblende
gabbro; major minerals are plagiobclase, both
clinopyroxene and orthopyroxene, and
hornblende, olivine or quartz
(DOgm) Metagranite and Metagranodiorite - Very
light gray to pinkish -gray, medium- to coarse -
grained, foliated, metamorphosed biotite granite,
biotite granodiorite, and hornblende-biotite
granite at Mountain Island, N.C.; coarse -grained
phase is characterized by euhedral, zoned
plagioclase crystals and mosaics of highly
sutured quartz grains
(mgb) Metagabbro - Dark, coarse -grained;
abundant amphibole replaces olivine and
pyroxene, although relicts of these minerals
occur; epidote is common, biotite and spinel may
be present; plagioclase is less abundant than the
mafic minerals; quartz is rare or absent
(mqd) Metamorphosed Quartz Diorite and
Tonalite - Gray, usually medium- to coarse -
grained, generally foliated rock composed
dominantly of plagioclase, quartz, biotite,
hornblende, and epidote. Biotite, hornblende, and
epidote commonly associated in clots replacing
original mafic phenocrysts; clots may be smeared
out, thus defining foliation
OUTCROPPINGS
I. Metadiabase
Q Metadiorite
TOP -OF -ROCK AT BORINGS
■ Gneiss
■ Metadiabase
❑ Metadiorite
Contacts - Solid where approximate; dotted where
concealed
— — — DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
COINCIDENT WITH DUKE ENERGY
PROPERTY BOUNDARY
SITE GEOLOGIC MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
6-1

NOTES:
•
ALL BOUNDARIES ARE APPROXIMATE.
SITE AERIAL 0RTHOPHOTOGRAPHY OBTAINED FROM WSP, DATED 2014. /
DRAWING HAS BEEN SET WITHAPROJECTION OF NORTH CAROLINA STATE
PLANE COORDINATE SYSTEM RIPS 3200 (NAD83/2011). 'k
* DENOTES EXISTING OR FORMALASH POREWATER MONITORING WELL.
�•�••..._.._......••100
A jql
M iTIT&IM-
/
E
J^
-000
SW-3
_•
.`••
iVnA
❑ SW-1
MW-2S/S-A/d
a �n^, Cola
SECONDARY GWA-9S/D/BR/BR-illiiiiYil■
CELL
D ak��
a AB-2s
MW-lA
GWA-8S/D '.
. L
BIC
MARYCELL i� GWA-7S/D/BR/BR-I
OB-1 OB-2
I--
GWA-22BR
GATE 7
5W001
♦ L. _
0 ' E ,
w
♦ `
' 1
i4* i
�,; = GWA-5 CM
300 160 0 300 600
GRAPHIC SCALE IN FEET
synTerra
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
c > DUKE
'c ENERGY
WWW- nterracor .com
DRAWN BY. A. FEIGL DATE: 10/26/2017
PROJECT MANAGER: J.MAHAN
CAROLINAS
CHECKED BY. B. WYLIE
P:\Duke Energy Pr mss.1026\00 GIS BASE DATA\Riverbe
� _ S-13 , 277.5-0.3m ❑
E '
- S-13A
1
/
LEGEND
a
ASH POREWATER MONITORING WELL LOCATION
GROUNDWATER SAMPLING OR WATER LEVEL
MEASUREMENT LOCATION
BACKGROUND GROUNDWATER MONITORING WELL
LOCATION
ABANDONED MONITORING WELL LOCATION
(,
2017 BACKGROUND SOIL SAMPLE LOCATION
(,
SEEP/AREA OF WETNESS (AOW) SAMPLING LOCATION
❑
SURFACE WATER SAMPLING LOCATION
APPROXIMATE STREAM (NON -JD)
WASTE BOUNDARY
mom- COMPLIANCE BOUNDARY
- - DUKE ENERGY PARCEL LINE
FIGURE 6-2
CROSS SECTION LOCATION MAP
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

A ---a-
(SOUTHWEST)
LEGEND
MW 12S
WELL IN SAPROLITE MATERIAL
MW 16D
WELL IN DEEP ZONE
MW 16BR
WELL IN COMPETENT BEDROCK
ABMW 2
WELL IN ASH PORE WATER
MY 1001
NCDEQ WATER SUPPLY WELL
AB 3S
ABANDONED WELL
GENERALIZED WATER TABLE
GENERALIZED GROUNDWATER
FLOW DIRECTION
ASH
ASH PORE WATER
®
WEATHERED ROCK
®
BEDROCK
V ASH FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
V
SURFICIAL FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
V
WEATHERED ROCK FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
V
BEDROCK FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
DDInn A DV CCI 1 CCCnAInAov CCI 1
0 100 200 400
HORIZONTAL SCALE: 1" = 400'
VERTICAL SCALE: 1" = 80'
5X VERTICAL EXAGGERATION
NOTES
1. WATER LEVELS TAKEN MAY 22, 2017.
SOURCE INFORMATION:
ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2. DATED AUGUST 2016.
A'
(NORTHEAST)
RY
RIVERBEND
PROPERTY
BOUNDARY
I
CATAWBA
RIVER
I
CROSS SECTION LOCATION

6---w-
(SOUTHWEST)
By
(NORTHEAST)
FORMER
INTERMEDIATE
Y Y DAM
ASH a a
WATER IN a a
---------------
BASIN
FILL
w op FILL --- _ --- -- ,'
o w
EXCAVATED
dd - - -- -- ---- -- --- - ---- -- ---- -- ---- -- - -- -
ASH = �_' _
-- - -
FILL ----------
____________________ _____________________________ �Y s
- _______________—ter_ _ IN------------- -----
ASH - - - ------ ro spa " r r
----------- i------------ ----------------- -- ------ ,. ASH PORE ra'arb
__ WATER ----_ CATAWBA
ASH PORE RIVER
WATER
SAPROLITE SAPROLITE
WEATHERED ROCK
WEATHERED ROCK
0 100 200 400
HORIZONTAL SCALE: 1" = 400'
VERTICAL SCALE: 1" = 80'
5X VERTICAL EXAGGERATION
LEGEND
NOTES
MW 12S WELL IN SAPROLITE MATERIAL
V
ASH FLOW LAYER GROUNDWATER 1. WATER LEVELS TAKEN MAY22, 2017.
MW 16D WELL IN DEEP ZONE
WELL WATER LEVEL ELEVATION
MW 16BR WELL IN COMPETENT BEDROCK
V
SURFICIAL FLOW LAYER GROUNDWATER
ABMW 2 WELL IN ASH PORE WATER
WELL WATER LEVEL ELEVATION
MY 1001 NCDEQ WATER SUPPLY WELL
V
WEATHERED ROCK FLOW LAYER GROUNDWATER
AB 3S ABANDONED WELL
WELL WATER LEVEL ELEVATION
BEDROCK FLOW LAYER GROUNDWATER
GENERALIZED WATER TABLE
WELL WATER LEVEL ELEVATION
GENERALIZED GROUNDWATER
FLOW DIRECTION
SOURCE INFORMATION:
ASH
ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2. DATED AUGUST 2016.
ASH PORE WATER
WEATHERED ROCK
® BEDROCK
CROSS SECTION LOCATION

C
(NORTHWEST)
C'
(SOUTHEAST)
FORMER
INTERMEDIATE
as DAM aaa
ow
o w m
FILL
FILL �c a a a
ASH FILLEXCAVATED Le
CATAWBA --------------------
ASH -------- -------------- �--------------
RIVER------------
LEGEND
MW 12S
WELL IN SAPROLITE MATERIAL
MW 16D
WELL IN DEEP ZONE
MW 16BR
WELL IN COMPETENT BEDROCK
ABMW 2
WELL IN ASH PORE WATER
MY 1001
NCDEQ WATER SUPPLY WELL
AB 3S
ABANDONED WELL
GENERALIZED WATER TABLE
GENERALIZED GROUNDWATER
FLOW DIRECTION
ASH
0
ASH PORE WATER
WEATHERED ROCK
®
BEDROCK
SAPROLITE
WEATHERED ROCK
V ASH FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
V
SURFICIAL FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
V
WEATHERED ROCK FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
V
BEDROCK FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
0 100 200 400
HORIZONTAL SCALE: 1" = 400'
VERTICAL SCALE: 1" = 80'
5X VERTICAL EXAGGERATION
NOTES
1. WATER LEVELS TAKEN MAY 22. 2017.
SOURCE INFORMATION:
ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2. DATED AUGUST 2016.
CROSS SECTION LOCATION

D
(NORTHWEST)
CATAWBA
RIVER
mmlw ---
-0110
FILL
,- ZA*A
WEATHERED
ROCK
D'
(SOUTHEAST)
0
Z
W
m
W�
Oa
x0
ww
wx
U)U
OW
xm
m fn
QQ
QQQ
QQQ
~ �I ►►
Q
_
" ______
__----------------------------------------------------
_-_-__-__-_-__-__---__-__ -
----
z
ASH --------
o
_EXCAVATED
'J=l--T-- --- ASH
— ASH PORE
WATER
SAPROLITE
SAPROLITE
WEATHERED ROCK
0 100 200 400
HORIZONTAL SCALE: 1" = 400'
VERTICAL SCALE: 1" = 80'
5X VERTICAL EXAGGERATION
LEGEND
NOTES
MW 12S WELL IN SAPROLITE MATERIAL
V
ASH FLOW LAYER GROUNDWATER 1. WATER LEVELS TAKEN MAY 22, 2017.
MW 16D WELL IN DEEP ZONE
WELL WATER LEVEL ELEVATION
MW 16BR WELL IN COMPETENT BEDROCK
V
SURFICIAL FLOW LAYER GROUNDWATER
ABMW 2 WELL IN ASH PORE WATER
WELL WATER LEVEL ELEVATION
MY 1001 NCDEQ WATER SUPPLY WELL
V
WEATHERED ROCK FLOW LAYER GROUNDWATER
AB 3S ABANDONED WELL
WELL WATER LEVEL ELEVATION
BEDROCK FLOW LAYER GROUNDWATER SOURCE INFORMATION:
• GENERALIZED WATER TABLE
WELL WATER LEVEL ELEVATION ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2, DATED AUGUST 2016.
GENERALIZED GROUNDWATER
FLOW DIRECTION
ASH
0 ASH PORE WATER
'per
FIGURE 6-I
WEATHERED ROCK
® BEDROCK
wnTem
GENERAL CROSS SE
148RIVERSTREET.SUITE220 ^nGn^
CROSS SECTION LOCATION

E-
(NORTHWEcTl
LEGEND
MW 12S WELL IN SAPROLITE MATERIAL
MW 16D WELL IN DEEP ZONE
MW 16BR WELL IN COMPETENT BEDROCK
ABMW 2 WELL IN ASH PORE WATER
MY 1001 NCDEQ WATER SUPPLY WELL
AB 3S ABANDONED WELL
_ GENERALIZED WATER TABLE
mom.o, GENERALIZED GROUNDWATER
FLOW DIRECTION
ASH
0 ASH PORE WATER
® WEATHERED ROCK
® BEDROCK
E'
(SOUTHEAST)
.0-4 Q� I 0.10. 0 100 200 400
wl
Q
�� o I o ►op- HORIZONTAL SCALE: 1" = 400'
z ? VERTICAL SCALE: 1" = 80'
p 0-0- 5X VERTICAL EXAGGERATION
�I
-0.0 I I~
V ASH FLOW LAYER GROUNDWATER
NOTES
1. WATER LEVELS TAKEN MAY 22, 2017.
WELL WATER LEVEL ELEVATION
V SURFICIAL FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
V WEATHERED ROCK FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
V BEDROCK FLOW LAYER GROUNDWATER SOURCE INFORMATION:
WELL WATER LEVEL ELEVATION ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2, DATED AUGUST 2016.
CROSS SECTION LOCATION

t,
8, -.•
Y Y<652.45
F s
e
s
x ,
a s. ,. - ,,, .. ,,,�y�"`k"�- � '`.. �...., 'c A < 647 32 ♦ �j4 a!`�� �# a , �,�. ` ��
� e
s
•
µ
:
r
' y" s• 4, } MW-zD , AB-1D647.66
687.39
4
♦1, 650.63
a� 678.97 -GWA-9D
m
MW-14
652.62
N ».
r.4
AB-4D
r
GWA-8D • t_.«=fi *.._z-.
t _ -��I♦♦ ♦� AB-3D 6e
4" x' �. ♦♦ x,1! a - 700.2 1♦ :.BG-3D
'TM,` x, l r ♦I , I - �.. • # 644.85
,.: .. r �.. ,'�� •'�•� I • `�� � � xs`�• F�\64995D
o- w
............... _ GWA-7 I !*:647v93D -K67098D
GWA-3D _ �. r, ,4
i , � �� � ��� �� � � �� LEGEND
645.5 AB-8D"�
c -.' t at "tin 658.58 COMPLIANCE WELL
67496- ELEVATION IN FEET (NAVD 88)
fi
BACKGROUND WELL
GWA 11D '- c 2D ELEVATION IN FEET (NAVD 88)
'
NA 'i`n„ 653 47
��`,*
AS WELL
.•� 7
» �.rt•,� § $ ELEVATION IN FEET (NAVD 88)
.,.' GWA 6 -
p - MW 7D fig# ,
7147s 71zos WATER LEVEL CONTOUR IN FEET (NAVD 88)
y L: .... x' GWA 12D `.� /, AS-3DT
'74
As-2D BG 1D . INFERRED WATER LEVEL CONTOUR (NAVD 88)
£ :+
' rx t
.j ,.� As-1D 69s47 NAA14D e 67444 GROUNDWATER FLOW DIRECTION
w
b.. v;: I. • # r" '1@+ f !d J +¢� L Y. %fi �l ^F '� Ae h
3`� GWA-23D GWA-sD`:. APPROXIMATE STREAMS (NON -JD)
., .. . ; 704.94 , _
♦ "'C GWA-4D N �.. ASH BASIN BOUNDARY
' .,,. +.�" x' "" • "^'1. .-. ', � _.,0-<.673.88 ..;�... � GWA22D,un�A.. A " �,..-:Y' :,�'� -�.r. ..�.. •� •._•Y"=.�.
GWA20D 709.29 ♦ ,. tr — COMPLIANCE BOUNDARY
Y rfi•
r
r
> . �. # r a x•<
NA - �
♦Fy,. t i MW BI <<t. DUKE ENERGY CAROLINAS RIVERBEND SITE
'a' Ge ;�' .9!. ♦♦ j > k"!"','.;fir. _ "1:. =MW8D70716rBOUNDARY
�3D„'" 7"`'� fi..: NOTES:
.R♦ .�, :�.. •- `•v.�. - m;. /�,q�^ '� e ;♦ � � >.« x.. �'-.. :.. as f•;� �a,xr4 a '4"a•.n�,x,.
.: �.s..i. ;,x t,..;. �,- ? ,,...... ,.t.,:: ,.,r. 'k;€.. r ,n..:^'.e:- ,fir' .j• 4 'is * ;�"-.x. ,t (�y.•": ,
- � s �, I„c,'.. F` r ♦ .7 '•'+ -- = �' J:"' ,�,..__r., _, . cM, "': �i `\ ^� o .t „ r:., -• � .r :. a�`'!'sz +�WATER LEVELS COLLECTED BY PACE, JULY 8-9, 2015.
�y§�.. F.: ,;j�,. ..i ! � ., .: � : ��.t�.^� '�1 ♦�` i `' � �ks ,„. ,�,,� .f" m �k" 7T�'. r s`' r *`�` �sw,.
,� ` . .'"`t. .^:'., �,,,. �. ♦..,� r4 .. ', -pep `i gv .. .,yti�a;l' .,. �{, -+ ♦, ^t,A4 ""' . ;.. NA NOT AVAILABLE
OF
= ` ` .�'"
S
`•., r� ;� f • *` '? ,» ,k+- �- ` -. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
.. a� ,�, / ��....� �r! ..x'.:", , .� , s. ,i?'.. ,Q. F �.... ��- t�•w+.� m:' q. -tat'-°. r''°�• _. .. .,Y�"
:... i. :3t, ,- ,:a. ,, ... ,� . �.-. �.. ,r, r4:q' ,, _•�.;� ,. .A� ij, i!' xy•:.. � -"1�,:�r;� ..� ' 4r•' „��" _ ,.x *THIS VALUE IS SHOWN FOR INFORMATIONAL PURPOSES BUT REVIEW INDICATED
-* ,. - '-. % <`'�m• )/` * .."$' _ ,.,' ry" • ':4 `t'i1-: '� 1' "_ -*.TM °; `:✓A THAT IT MAYBE ERRONEOUS AND THEREFORE IS NOT USED FOR DRAWING THE
' y ;. ,_, *, ,., ,; % �. .� . > ,• '�_'.a .. r.,.�.�r..Y�,x"'+•i.`� s «�,` •i.. -.�.... No- -*>~;:, - POTENTIOMETRIC LINES
BG 4D . ,:• e, P '`f Yr'q. .� x` Q' $.., R'x >'� t .} T, r� P ,r-. i..
.-�- ,� _ ♦... ,,,,,• / - r,;_ rr • :- �".' a „ ,,,6 >�S \,t ,�*•«'�" ya,. h y ELEVATIONS ARE REFERENCED TO THE NORTH AMERICAN VERTICAL DATUM 88
(NAVD 88).
jE
/..III V71
it
- •>v� ,7 y;�.<`, s, .+;„' :` .- v ,'� , "' I '♦ ¢.. • _ AERIAL PHOTOGRAPHY OBTAINED FROM WSP, DATED 2014.
• BG-ID] !�: / .. 6 • ♦ .,,, >,..,.„.,s;'„�` "tr,sj.`? * -" �"`' '�'4'31''+ '��.' �"'' - DRAWING HAS BEEN SET WITHAPROJECTION OF NORTH CAROLINA STATE PLANE
NA �.,�: ♦ - ' ` "."`ir' COORDINATE SYSTEM RIPS 3200 (NAD83/2011)
f m �'
��`
//i ♦
•�1•�•
7
"«
_ _ �p"x i<''ti,�,;
;
300 150 0 300 600
FIGURE 6 10
/A ��
",
�#
�� .`' ��
r` _
GRAPHIC SCALE wFEET
POTENTIOMETRIC SURFACE EARLY
•
'r«
,_ .
synTerra
148RIVERSTREET.SUITE220
EXCAVATION JULY 2015 -DEEP WELLS
GREENVILLE, SOUTH CAROLINA 29601
RIVERBEND STEAM STATION
♦,
41,
DUKE
PHONE[phone]
www nterracor .com
DUKE ENERGY CAROLINAS, LLC
♦�.
r
'♦^ �"
5
'c> ENERGY
DRAWN BY. J. ROBERTS DATE: 10/26/ 7
MOUNT HOLLY, NORTH CAROLINA
R
.�
x r
g'.?'
•�- �
R- •
-
CAROLINAS
CHECKED BY: K. FOX
PROJECT MANAGER: J. MAHAN
P:\Duke Enerov Pr mss.1026\00 GIS BASE DATA\Riverbend\Ma Docs\CSA Supplement
2\Before Excavabon Water Level Ma s\DEEP WATER LEVEL MAP.mxd

• ••�.. �.. �..r.. r.. I•
GWA-3BR x;
72
MW 15BR "M!,
3.95 T"""y err,,
. GWA 10BRU�+.,z.
643.92
7
76
.34
.01
LEGEND
COMPLIANCE WELL
3G-2BR
ELEVATION IN FEET (NAVD 88)
i93.83
BACKGROUND WELL
ELEVATION IN FEET (NAVD 88)
ASSESSMENT WELL
ELEVATION IN FEET (NAVD 88)
WATER LEVEL CONTOUR IN FEET (NAVD 88)
INFERRED WATER LEVEL CONTOUR (NAVD 88)
--_• GROUNDWATER FLOW DIRECTION
APPROXIMATE STREAM (NON -JD)
GWA-23BR� a ASH BASIN BOUNDARY
-20BR 703.38 , r•............. � ��..�..�..�.• ,. � �.
"�••.COMPLIANCE BOUNDARY
GWA 22BR A�
NA ���� DUKE ENERGY CAROLINAS RIVERBEND SITE
b �� BOUNDARY
' ,)p,.a�.,s,�,,�, „d..,a•e; <:: .,�$ :,r �r�i�; 5,.�: o NOTES:
Sx - jf i ' PP''ef.'"
L' � .� WATER LEVELS COLLECTED BY PACE, JULY 8-9, 2015.
NA NOT AVAILABLE
yv
a
• i.' "T ' S .. ff;" '.. �� 2 f �"'= `' a '.t PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
,
*THIS VALUE IS SHOWN FOR INFORMATIONAL PURPOSES BUT REVIEW INDICATED
THAT IT MAYBE ERRONEOUS AND THEREFORE IS NOT USED FOR DRAWING THE
POTENTIOMEfRIC LINES
ELEVATIONS ARE REFERENCED TO THE NORTH AMERICAN VERTICAL DATUM 88
(NA 88)
AERIAL PHOTOGRAPHY OBTAINED FROM WSP, DATED 2014
" . DRAWING HAS BEEN SET WITHAPROJECTION OF NORTH CARO LI NA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
, §a
300 150 0 300 soo FIGURE 6-12
GRAPHIC SCALE IN FEET
POTENTIOMETRIC SURFACE EARLY
"7'Terra Yst \c, 148RIVER STREET, SUITE 220 EXCAVATION JULY 2015 -BEDROCK WELLS
GREENVILLE, SOUTH CAROLINA 29601
RIVERBEND STEAM STATION
PHONE [phone]
DUKE www- nterracor .com DUKE ENERGY CAROLINAS, LLC
ENERGY. DRAWN BY. J.ROBERTS DATE:10/26/2°17 MOUNT HOLLY, NORTH CAROLINA
CHECKED BY. K. FOX
'J'` +� CAROLINAS PROJECT MANAGER: J. MAHAN
f P:\Duke Ener Pr mss.1026\00 GIB BASE DATA\Riverbend\Ma Docs\CSA SuDDlement 2\Before Excavabon Water Level Ma s\BEDROCK WATER LEVEL MAP.mxd

•I•
,I
I�
,I
. •I.
.100
—.............. —..I•
NA
s. .
:1
�1Jolq
.,.�
f"e'
h
MW-9BR
649.14
WA 2BR
kj
644 98 ,
GWA-2BF
644.99
-�•� N1w-15BR
644 04
♦ GWA-10BRU
644.53
GWA-1BRU %'♦,
657.26 _ •.
659.71
551
' .j*
GWA-7BR
670.64
MW-7BR
.�.. • :. • f...; :.: 707.94
�♦ �r '�, GWA23BR'::
• GWA-4BR 695.91
�� • 671
_ ,♦ '_ � - , , e % GWA20BR _ GWA-22BR-A
s
700.58
688 OS
•
r n,
a
• �.v
_ - L� � BG 4BR' •? '� � an
l l 598 51
FBG- BR
1
t - • _ 300 150 0 300 600
tom. �, ♦ • • �
•.� , 7 s, " s GRAPHIC SCALE IN FEET
�• i / : i 148 RIVER STREET. SUITE 220
synTerra
�. ��' _ : `� - ' Q,, GREENVILLE, SOUTH CAROLINA 29601
PHONE[phone]
♦, : ti# .Y a.•,_ fi DUKE
- nterracor .com
_ � DRAWN BY. J. ROBERTS DATE: 10/26/2017
� . ENERGY. CHECKED BY. K. FOX
, �' * CAROLINAS PROJECT MANAGER: J. MAHAN
�,
11
• i P:\Duke Enerav Pr mss.1026\00 GIB BASE DATA\Riverfiend
LEGEND
COMPLIANCE WELL
ELEVATION IN FEET (NAVD 88)
BACKGROUND WELL
ELEVATION IN FEET (NAVD 88)
ASSESSMENT WELL
ELEVATION IN FEET (NAVD 88)
WATER LEVEL CONTOUR IN FEET (NAVD 88)
INFERRED WATER LEVEL CONTOUR (NAVD 88)
GROUNDWATER FLOW DIRECTION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
BOUNDARY
NOTES:
WATER LEVELS COLLECTED BY PACE, MAY 22, 2017.
NA = NOT AVAILABLE
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
*THIS VALUE IS SHOWN FOR INFORMATIONAL PURPOSES BUT REVIEW INDICATED
THAT IT MAY BE ERRONEOUSAND THEREFORE IS NOT USED FOR DRAWING THE
POTENTIOMETRIC LINES
ELEVATIONSARE REFERENCED TO THE NORTH AMERICAN VERTICAL DATUM 88
(NAVD 88).
AERIAL PHOTOGRAPHY OBTAINED FROM WSP, DATED 2014.
DRAWING HAS BEEN SET WITHAPROJECTION OF NORTH CAROLINASTATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 6-13
POTENTIOMETRIC SURFACE LATER
EXCAVATION MAY 2017 - BEDROCK WELLS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

NOTES:
1. BASE MAP FROM MOUNTAIN ISLAND LAKE, N.C. AND LAKE NORMAN SOUTH, N.C. USGS 7.5-MINUTE TOPOGRAPHIC QUADRANGLES
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.
j o
� '%$ • id' .y r Fk'E NEC!{'
I M..
Cy 'f WO�� i0°0 NUT 3000 -• •�4W 6000 IDW FrFT
Toorahic
lineament
y
1 ML CONTOUR INTERVAL IO FEET J•
@@ `
(a RAF1011RL GEODETIC VEIlTICRL MTUY OF 1929 `
� ITs� vrTc �rN Base map: Mountain Island Lake, N.C. and Lake Norman
°Ep+""a"��c%T South, N.C- USGS 7-5-minute topographic quadrangles
/.3.'•� `$Ili-VAW�L`i,i:Sa J�l]Se� : ••„ ... "'� 1�l
FEZ
TOPOGRAPHIC LINEAMENTS
AND ROSE DIAGRAM
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
6-14

NOTES:
1. PHOTOMOSAIC OF RIVERBEND PERFORMED WITH A LIETZ SOKKIA MS-27 MIRROR STEREOSCOPE WITH MAGNIFYING BINOCULAR EYEPIECE
2. AERIAL PHOTOGRAPHY PROVIDED BY DUKE ENERGY (FROM WSP), 9X9 INCH GRAYSCALE CONTACT PRINTS,1"=600', DATED 04/17/2014
Source: HDR, Comprehensive Site Assessment Report, Riverbend Steam Station Ash Basin, August 18, 2015.
FEZ
AERIAL PHOTOGRAPHY LINEAMENTS
AND ROSE DIAGRAM
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
6-15

LEGEND
SATURATED SOIL SAMPLE LOCATION AND DEPTH
(FEET BELOW GROUND SURFACE)
UNSATURATED SOIL SAMPLE LOCATION AND DEPTH
(FEET BELOW GROUND SURFACE)
ASH BASIN WASTE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
-••-••- DUKE ENERGY CAROLINAS SITE BOUNDARY
NOTES:
AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO SEPTEMBER 13, 2017.
IMAGE COLLECTED IN 2016.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM FIPS 3200 (NAD83/2011).
COI RESULT UNRS PBTV PSRG �t 1 :
CHROMIUM 30.1 mg/kg 20 3.8 {.�Zi -1
4{. COI RESULT UNITS PBN PSRG .�R* R r s S
IRON 45800 mg/kg 40150 150 X ''f��✓a ri1_ �•a �''''`�^ _
pH 4.1j
VANADIUM 118 mg/kg 113 6 ,5H a1VD&I.�, tt},
1 W+ I pH 4.1j S.U. 4.3-6.7 NE
CHROMIUM 29.5 mg/kg 20 3.8
RESULT UNITS PBTV PSRG A'•
Y CHROMIUM 92.8 mg/kg 20 3.8 r>'
1
CHROMIUM 110 mg/kg 20 3.8 e}
R'
IRON 55200 mg/kg 40150 150
MANGANESE 2940 mg/kg 1867 65
i g
�/TJ; 4{`�' 4 '•� VANADIUM 133 mg/kg 113 6
�.a,. '7 • 1 ..
�. • 1 _ I
pH 9.1j S.U. 4.3-6.7 NE '"o✓kg -
aa
N PSRG �- y,'-_ p .•'._( 3.8 18
ESE 2660 mg/kg 1867 65
M 19.4 mg/kg 18.3 NE
249j mg/kg 12 NE
'� t, - F,
I(53.5-55)
AB-02D (28.5 - 30)
1111111T111111��111111�� ]/..
00"- RB-02D (68.5-70)
All
AB-04D (48.5 - 5-07-
AB-04D (58.5 - 61.5)
_ - AB-06D (8.5 - 10)
GWA-09D(50.5-51)
COI
GWA-08D
RESULT
UNITS
1
PBTV
PSRG
CHROMIUM
131
mg/kg
20
3.8
COBALT
87
mg/kg
58.6
0.9
BORON
<18
mg/kg
20.7
45
CHROMIUM
135
mg/kg
20
3.8
COBALT
102
mg/kg
58.6
0.9
IRON
36400
mg/kg
40150
150
AB-D3D(68s-70)
AB-06D(73.5-7�
I�
IIIIII�
IIIIII>�
IIIIIIII�
GWA-03D (40-40.5)`C-01D (13.5 - 15)
col A® (1®PBTV
PSRG
I'LYS'�IIY'�Il�llllllli'ii®®®
C-01D(23 Lv--q-v .zi h 1 AB-D8S(2D-25)
Vimm®® - AB-07D (28.5 - 30)
jj
� As-02D(23s-25) IL OB-01 (33.5 - 35)
®®®®® AS-03D (53.5 - 55)
® A®(28.5-30®
C-02D (18.5 - 20)
AS-02D(30.31.5)
C-02D 23.5 - 25
g/kg 113 6
1
1
m g 183
N E1.�
COI
RESULT
UNITS
I PBTV
PSRG
ONTUM 183.
.CHROMIUM
33
mg/kg
1 20 1
3.8
�
rt
y
SULFATE
175 j-
mg/kg
1 12 1
NE
}"
CHROMIUM
20.6
mg/kg
1 20 1
3.8
pH
8.2j
S.U.
4.3-6.7
NE
'
Ste.
o
pH 1 3.81 S.U. 4.3-6.7 NE SULFATE 1 173j 1 mg/kg 1 12 1 NE - • w ���I! - -'
' I 0 100 200 400 600 u
1 FIGURE 7-1
COI RESULT UNITS PBTV PSRG,,., COI RESULT UNITS PBN PSRG - �� GRAPHIC SCALE IN FEET POTENTIAL SECONDARY SOURCE
\ BORON <16.3
PH 3.9j S.U. 4.3-6.7 NE ( \ mg/kg zo.7 45� 148 RIVER STREET, SUITE 220 SOIL ANALYTICAL RESULTS
CHROMIUM 58 mg/kg 20 3.8 CHROMIUM 1.6j mg/kg 20 3.8
GREENVILLE, SOUTH CAROLINA 29601 RIVERBEND STEAM STATION
STRONTIUM 42.9 mg/kg 18.3 NE 0- IRON 5230 mg/kg 40150 150 PHONE[phone] DUKE ENERGY CAROLINAS, LLC
SULFATE 506j-
SULFATE 338j mg/kg 12 NE �� .com mg/kg 12 NE _ �. DUKE www.s nterracoTDRAWN BY: A.FEIGL DATE:10/26/2017 MOUNT HOLLY NORTH CAROLINA
ENERGY: PROJECT MANAGER J.
- SULFATE 332j mg/kg 12 NE CHECKED
PH 3.8j S.U. 4.3-6.7 NE _ ��- �• : 1'-� - �. _, __ _ CAROI�NAS CHCK D BY: B. WYLIE
• 1
1
COI RESULT
UNITS PBTV I PSRG
IRON
41000
mg/kg 40150 150
MANGANESE
1950
mg/kg 1867 65 L
VANADIUM
130
mg/kg 113 6

Z
0 0 -a-
Ca —
L7
synTerra
/ NO-_
0`b ° 80%
ZD moo°
o •
6 0 % '-'O
00. i?
Z
40%
CPO°
o ..
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
www.synterracorp.com
DRAWN BY: T. PLATING DATE: AUGUST 2017
PROJECT MANAGER: J. MAHAN
LAYOUT:
FIL PATH'.
P'.\Duke Energy Cardinal\15. Rivz .e d\05. EHS LAMA Compliance Support\GSA
Supplement 201TPipar
Well ID
% Difference
SW-01
3.224
1 SW-02
2.955
♦ S-02
3.891
• S-05
5.399
S-09
2.459
♦ S-11
6.118
S-19
3.068
Z S-04
4.570
♦ S-06
4.019
S-08
7.239
S-01
13.640
S-03
20.415
S-10
32.414
S-13
10.109
S-20
23.845
SW-03
18.293
Notes:
— Ponded Source Area Water
Purple —AOW
Blue — AOW/Surface Water
Open Symbols —
Upgradient Locations
Data with charge balance
>10% are omitted from plot
Data included for analysis from May 2016-May 2017
Data presented may include
lab -qualified results.
Refer to analytical data
table notes for qualifier
definitions. Non -detect analytical results are plotted
at the corresponding reporting limit
FIGURE 9-1
PIPER DIAGRAM - AOW WATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

o w
\ 61
O
Cli
V o coo �
O� x
�Oo 0 A
� o�o
Oo ��
■
x
*
�O
80% 2
6 0 %�`-
• x
/40% A
o�o
O
20% ■�
g
OOo 60o 'Oo -"Oo
0 0 0 C
Ca —
L7
synTerra
04
— CI
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
www.synterracorp.com
DRAWN BY: T. PLATING DATE: AUGUST 2017
PROJECT MANAGER: J. MAHAN
LAYOUT:
FTEPATH'.
P'.\Duke Energy Cardinal\15. Rivz .e d\05.EHS LAMA Compliance Support\GSA
Supplement 201TPipar
0%
Well ID
% Difference
♦ C-02S
3.216
❑ AB-8S
1.325
X BG-3S
4.574
0 GWA-2S
2.386
O GWA-3S-A
2.697
GWA-4S
2.547
GWA-9S
0.484
g GWA-10S
2.524
♦ GWA-11S
1.601
O GWA-12S
0.202
* GWA-15S
0.965
MW-02S-A
1.847
MW-3S
3.765
z MW-5S
5.114
p MW-6S
5.081
MW-9
6.432
MW-15
1.389
• GWA-07S
7.221
GWA-06S
0.318
GWA-20S
17.913
GWA-21S
45.366
GWA-23S
12.701
BG-01 S
13.260
BG-04S
10.717
GWA-14S
12.055
MW-7-SR
13.133
Notes:
Black — Within or Below Ash Basin
Blue — Downgradient
OrangE — Upgradient
Data with charge balance >10% are omitted from plot
Data included for analysis from May/
July 2017
Data presented may include lab -qualified results. Refer
to analytical data table notes for qualifier
definitions.
Non -detect analytical results are plotted at the
corresponding reporting limit.
FIGURE 10-1
PIPER DIAGRAM — SHALLOW FLOW LAYER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

80%
60%
g
40%
❑
O
2 0 %Yo
0 0
�— Ca
■
46
�k
n�o
L7
synTerra
�O
k
Q c'
� Oo
C� ° 80%
orb to
,ZU 60% NO
0-Do - F
17
° 17
40%`
�o
° " 20%
Nam\° ° \° ��\o
CI
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
www.synterracorp.com
DRAWN BY: T. PLATING DATE: AUGUST 2017
PROJECT MANAGER: J. MAHAN
LAYOUT:
FIL PATH'.
P'.\Duke Energy Carolinas\15. Rivz .e d\05.EHS LAMA Compliance Support\GSA
Supplement 201TPiper
Sample ID
% Difference
■ AB-02D
8.309
♦ AB-08D
5.054
A GWA-03D
4.064
X GWA-08D
5.813
p GWA-09D
5.913
O GWA-11 D
1.576
* GWA-12D
7.665
• MW-01 D
3.049
❑ MW-03D
5.254
Z MW-05D
6.166
MW-06D
5.516
O MW-15D
4.417
4 GWA-07D
7.760
■ GWA-22D
8.981
A BG-04D
9.654
♦ BG-05D
7.894
BG-03D
13.383
C-02D
11.201
GWA-01 BRU
12.167
GWA-15D
44.900
MW-02D
13.191
MW-04D
60.375
MW-07D
14.443
Notes:
Black - Within or below ash
Blue - Downgradient
- Upgradient
- Background
Data with charge balance >10%
are omitted
from plot.
Data included for analysis from
May 2017.
Data represent samples with pH
< 8.5 and
turbidity < 10.
FIGURE 10-2
PIPER DIAGRAM - DEEP FLOW LAYER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

60%
/40%
20%
1 P 11 � �
Oo Oo Oo Oo
F Ca Cl
1610
synTerra
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
www.synterracorp.com
DRAWN BY: T. PLATING DATE: AUGUST 2017
PROJECT MANAGER: J. MAHAN
LAYOUT:
FIL PATH'.
P'.\Duke Energy Carolinas\15. Rivz .e d\05. EHS LAMA Compliance Support\GSA
Supplement 201TPiper
Sample ID % Difference
♦ GWA-02BR 5.887
• GWA-03BR 6.233
■ GWA-07BR 7.219
A BG-02BR 5.887
BG-05BR 6.233
Notes:
Black — Within or below ash
Blue - Downgradient
-Upgradient
— Background
Data with charge balance >10% are omitted
from plot.
Data included for analysis from May 2017.
Data represent samples with pH < 8.5 and
turbidity < 10.
FIGURE 10-3
PIPER DIAGRAM — BEDROCK FLOW LAYER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

MW-15 � ♦
• ♦ Oulall104
ND GWA-10S `♦
• •. MW-3S
/ GWA-1S MW-4S
- • 0.11j ND �� �
•
1 ND �
♦ •
/ f MW-5S ,
♦ • 0.48 j ■
/ ♦ MW-6S �
♦ /#
♦ ND
♦�
♦ /♦ 0.14 j
MW-10 `• I
0000,
ND ■
♦
.•/ ...'00' , • •
, ♦ BG-3S
�. ••/ �- ♦■ Outal 102 MNDS
/5-02
• GWA-7S
0000
♦
♦ BGD
ND
GWA-11S ❑
♦. 0.12 j
♦
• ; GWA-6S
• GWA-12S 0.13j
• I ■
♦• ♦ GWA-23S .�..�■.�/ ■--- .�■■
♦ � GWA-' 0.23j �..�•
•
♦♦/ ♦ r ■
% �♦
BG-4S
■
1
♦
300 150 0 300 600
♦
// �♦
♦
GRAPHIC SCALE IN FEET
��
%/♦
1
synTerra
148 RIVER STREET, SUITE 220
■ 1
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
♦ ♦
♦• ' '
■ ,
c(> DUKE
. nterracor .com
ENERGY
DRAWN BY: J ROBERTS DATE: 10/26/2017
'♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYLIE
■ -
P:\Duke Energy Progress. 1026\00 GIS BASE DATA\Riverbe
LEGEND
1�TOTALANTIMONYCONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES.
THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR ANTIMONY IS 1 Ng/L
NO RESULTS EXCEED BACKGROUND CONCENTRATION OF 1 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-1
ISOCONCENTRATION MAP
ANTIMONY IN SHALLOW GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

•
■
MW 4D
/ MW-2D MNDD,.. ♦♦.
♦ O.S j
♦ OL
i
/♦ ♦ MW-6D ♦
• AB-2D ND GWA-9D �� .
i
♦
I
0000,♦
♦♦ `i • ♦�
••� � , , •
■
♦
♦
GWA-3D
0.2;
. 1
GWA-11 D•3
♦, 0.2 j
• • 0.36
�R
r
■ GWA-12D Mgt' �«a ,•.•
41
♦ �r ♦ ♦ . ar
1
% �♦ BG
2.1
`
♦
BG-SD
/ )
■ ♦ `
■
0.67
/
♦
`
300 150 0 300 600
♦
// �♦
• ♦
GRAPHIC SCALE IN FEET
�♦
♦
%/♦
1
synTerra
148 RIVER STREET, SUITE 220
■ 1
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
�♦
♦ ♦
' '
■ ■
c(> DUKE
WWW- nterracor .com
ENERGY
DRAWN BY J ROBERTS DATE 10/26/2017
♦♦
j
■
CAROLINAS
PROJECT MANAGER: J. MAHAN
CHECKED BY. B. WYLIE
■ ■
P:\Duke Energy Progress. 1026\00 GIS BASE DATA\Riverbe
LEGEND
1�TOTALANTIMONYCONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON —JD)
ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR ANTIMONY IS 1 Ng/L
NO RESULTS EXCEED BACKGROUND CONCENTRATION IS 1.1 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-2
ISOCONCENTRATION MAP
ANTIMONY IN DEEP GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

/
■
• ;.
GWA-1BRU
•
/
•
� / 1
/♦
' 1
♦ �- GWA-2BR . • ■
• I• `'
0000,
#♦�� • ♦�
/ ■ 1 `i
■4ftop, w,
• - n ,
GWA-7BR
ND
♦
�"'�� 't��
��
GWA-3BR
_ .•
�'
En
/♦
—
r
too,
�. �i
•
"'"
+' a akAli,
♦♦/
♦ r ■
♦
♦ ♦
I
n■`
♦
L
300 150 0 300 600
�`
// �♦
♦
GRAPHIC SCALE IN FEET
■
♦,
i/♦
1 I f
■
♦
synTerra
148 RIVER STREET- SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE[phone]
�•
♦
' '
■ ■
c(> DUKE
WWW- nterracor .com
DRAWN BY: J. ROBERTS DATE: 10/26/2017
'♦
ENERGY
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYLIE
■ ■
P:\Duke Energy Progress. 1026\00 GIS BASE DATA\Riverbe
LEGEND
1�TOTALANTIMONYCONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
—ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR ANTIMONY IS 1 Ng/L
NO RESULTS EXCEED BACKGROUND CONCENTRATION IS 2.9 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-3
ISOCONCENTRATION MAP
ANTIMONY IN BEDROCK GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

• GWA-10S ♦` / / Outfall 104 0.068 j � , , . .:-•
/ GWA-1S M0.11S MW-4S '� ♦`
•
0.0891,E 2.37 ♦♦
/ MW-13
ND hiL
MW 5S
/ MW-zS-A ,�. ND ♦ `♦ •
♦ • 0.18 a �'
♦ '
/ t
♦ MW-6S ♦
♦ / t
0.058 j 1
t
♦ 0.19
vD • •
0000,
.■-`
� ♦�� ` , ♦�
•�� � , 1 ♦ •
� 1 ♦ BG-3S
• ♦ ♦ ♦`� ♦ MW-1S
♦ • MW-9 GWA-7S
/� 0.058 j 0.15
GWA15 GWA-15S
- 0.22 B AB-8S
/ ♦ ♦ 0.087 j ❑
� GWA-11S C-is
♦. � 1.3 2
• C-zS
♦ / • 0.34
� M
• ♦ GWA-6S
• ■ GWA-12S � 0.079j
/ • 0.33 BG-1S
• f
/♦♦ ` ♦ GWA-23S .�..�-•�/ `-■�--�•• �..�--
�-.
♦ GWA-4S GWA-20S 0.0941,B • ��♦
♦ ♦ i_ �. p 0.15 0.095j
♦# ♦ �I—--��•.�..�.. GWA-21S t..�;"a„♦��7;
♦
BG-4S
■
�
%
0.22 B
ti
1
♦
`
300 150 0 300 600
♦
// �•
♦
GRAPHIC SCALE IN FEET
��
♦
%/♦
1
synTerra
148 RIVER STREET, SUITE 220
■ 1
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
♦ ♦
♦• ' '
■ ■
c(> DUKE
. nterracor .com
ENERGY
DRAWN BY J ROBERTS DATE 10/26/2017
♦♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYLIE
■ ■
P:\Duke Energy Progress.1026\00 GIS BASE DATA\Riverbe
LEGEND
1�TOTALARSENIC CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR ARSENIC IS 10 Ng/L.
BACKGROUND CONCENTRATION IS 1 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-4
ISOCONCENTRATION MAP
ARSENIC IN SHALLOW GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC

♦ ♦ T�� hYr [ i .'s 4
MW-15D♦ ! �, 'f d 6z 4',; a ,' �.r # >✓ +' tr :b
0.21
♦
MW-3D
.:... / MW-4D
♦ ♦ 0.052j ♦♦ Ns.♦
♦
MW-5D
•
/♦ ♦
t
MW-6D
ND
AB-2D
GWA-9D
ND
1� .
- /i
1
+
`.♦
-
I
000,
GWA-8D
10.052i
•
...0001 •
♦ •
•
BG-3D
.\
0000* �.
♦
♦ _ • . �-<
GWA-7D
I .,� � � : m� �`,;--.
0.14
GWA-31D0.51
GWA-15D, ♦ D
x
♦ s 063i
GWA-11 D:. m .. • ''f 3 'r �`,• -
♦
• ■ GWA-12D 1 -
/ • 1.3 _
♦
/♦♦/ GWA-22D •��.�..��.V `-• • •-���••�.■�.■�
1* �14
♦ • ',.� ��
♦ >
♦♦ A.
♦
■
♦
♦
•'�
♦
FBG-5DI
♦
/ /
■ ♦ ■
■
1
♦
`
300 150 0 300 600
♦
// �♦
• ♦
GRAPHIC SCALE IN FEET
�♦
♦
%/♦
1
synTerra
148 RIVER STREET, SUITE 220
■ 1
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONIE1164-421-9999
♦♦
♦ ♦
' '
■ ■
c(> DUKE
WWW- nterracor .com
ENERGY
DRAWN BY J. ROBERTS DATE 10/26/2017
♦♦
j
■
CAROLINAS
PROJECT MANAGER: J. MAHAN
CHECKED BY. B. WYUE
■ ■
P:\Duke Fnprq,, Progress. 1 026\00 GIS BASE DATA\Riverbe
LEGEND
1�TOTALARSENIC CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
—ASH BASIN BOUNDARY
—■■—■■■ COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —� BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR ARSENIC IS 10 Ng/L.
BACKGROUND CONCENTRATION IS 1 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-5
ISOCONCENTRATION MAP
ARSENIC IN DEEP GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC

/
■
GWA-1BRU
•
1 ,
'
♦�
1
♦
GWA-2BR
- . •
r
I•
`'
0000,
,
W.
•
�
GWA-7BR
0.1
9
BG-2BR
—
0.84
r..e
• 1'
Ali,
♦
♦ ♦
e
■
nG-5BR
2.5
/
♦
`
300 150 0 300 600
�`
// �♦
♦
GRAPHIC SCALE IN FEET
■
♦, i/♦
1 I
synTerra
148 RIVER STREET- SUITE 220
■ f
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
♦ ♦
�• ' '
■ ■
c(> DUKE
. nterracor .com
ENERGY
DRAWN BY: J. ROBERTS DATE: 10/26/2017
'♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYUE
■ ■
P:\Duke Energy Progress.1026\00 GIS BASE DATA\Riverbe
LEGEND
�TOTALARSENIC CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR ARSENIC IS 10 Ng/L.
BACKGROUND CONCENTRATION IS 2.9 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-6
ISOCONCENTRATION MAP
ARSENIC IN BEDROCK GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC

•
/ MW-15
0.14
•
`• •
♦
♦
Outfall
/ /
104 / 5-04
ND
GWA-10S
0.12
• ♦
/ GWA-1S
MW-3S
ND
MW-4S
♦ 0.014 j
2 88
/
I
r•
0.38
♦
♦
♦
'
MW-10
GWA-2S
♦
♦0000,
^ID
•
♦
'
•��
•
•
■
♦
♦
•
�
MW-9
0.015 j
GWA-3S-A
0.019 j,B
♦>�
♦♦♦♦
AB-8S
♦
GWA-11S
GWA-15S
C-1S 0.43
0.28
♦. 0.03 j
0.81
/ •
�,♦
1.4
♦ GWA-12S
• 1 • 5.2
' e
€Ifl,
A-BS
0.1
• •
5 GWA-7S
0.021 j
MW-7SR
0.013;
• BG-1S
• / ; Q I G0.051jS LEA
♦ f• ■ ■ _ ■
• y,G�WA-4S GWA-20S 00731 ,r' • . •
♦ • , � + r,. 0- • . .. 0.0=41• . GWA-21S . , ii
.
•
llix
♦/ `♦ ..E i t• 0.031 1. • i ,xFF cp,,-""
♦
M1,R1 4
♦ �._ �� /," .���. ♦ �
/ •;'4`Gf "�;�' // • _ w1r d+',}nrf ..q. *' 3
♦
`
300 150 0 300 600
♦
// �♦
♦
GRAPHIC SCALE IN FEET
�♦
♦
%/'
1
synTerra
148 RIVER STREET, SUITE 220
■ 1
♦
GREENVILLE, SOUTH CAROLINA 29601
♦ ♦
♦♦ ' '
■ •
c(> DUKE
=rII64-421-9999
WWW- ".rracor, .com
ENERGY
DRAWN BY J. ROBERTS DATE 10/26/2017
♦♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYLIE
■
P:\Duke Energy Progress. 1026\00 GIS BASE DATA\Riverbe
LEGEND
1�TOTAL BERYLLIUM CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
—••—••■ COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —■ BOUNDARY
NOTES:
THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR BERYLLIUM IS 4 Ng/L
BACKGROUND CONCENTRATION IS 0.144 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-7
ISOCONCENTRATION MAP
BERYLLIUM IN SHALLOW GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

/
■
MW 15D � ♦ !♦
MW-2D ND ` `♦ •
t P .
' /♦ ! MW-6D �
t AB-2D ND GWA-9D � �� . ♦
'"
♦ I
0000,
`.♦.., GWA-8D -���
0.011 j ♦
♦ ` j
.♦� ..00, ♦ • t
■ • BG-3D
�. ■
• _ GWA-7D
! r
♦ I ♦l r " � ND
GWA-3D
0.012j AB-8D
5.
GWA-11 D +�
♦♦ 0.082j a- •" r
oo� 2D 2v
l♦ / ND
♦ • � ; � FMW-7D
• 0.034 j
• f• ■
♦ 0.021j
♦♦/ ♦ r ■
♦
BG-5D
/
■ ♦ ■
■
ND
♦
`
300 150 0 300 600
♦
// �♦
• ♦
GRAPHIC SCALE IN FEET
synTerra
148 RIVER STREET, SUITE 220
■
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
♦•
♦ ♦
' '
■ ■
c(> DUKE
. nterracor .com
ENERGY
DRAWN BY J. ROBERTS DATE 10/26/2017
- '♦
j
■
CAROLINAS
PROJECT MANAGER: J. MAHAN
CHECKED BY. B. WYUE
■ ■
P:\Duke Energy Progress.1026100 GIS BASE DATA\Riverbe
LEGEND
1�TOTAL BERYLLIUM CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
—ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR BERYLLIUM IS 4 Ng/L
NO RESULTS EXCEED BACKGROUND CONCENTRATION OF 1 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-8
ISOCONCENTRATION MAP
BERYLLIUM IN DEEP GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

•
GWA-1BRU
y 0.026j ��
1
l
f
♦/ GWA-2BR 0000,
.♦ ♦� .
•
` •
■4ftop, ft.
,
• GWA 7BR
♦ x ND
i
• ti LEGEND
■ 1�TOTAL BERYLLIUM CONCENTRATION (pg/L)
• ND NOT DETECTED ABOVE REPORTING LIMIT
I
' HIGHEST CONCENTRATION AREA CONTOUR
♦�� NCAC 02L STANDARD CONTOUR
Irk
♦♦/ ♦ r
■
♦ �r
♦ ♦
._
ar _
♦
.
♦
♦
`
300 150 0 300 600
'`
// �♦
♦
GRAPHIC SCALE IN FEET
■
♦� i/♦
1 I
synTerra
148 RIVER STREET, SUITE 220
■ f
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE[phone]
♦ ♦
�• ' '
■ •
c(> DUKE
WWW- nterracor .com
ENERGY
DRAWN BY: J. ROBERTS DATE: 10/26/2017
'♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYLIE
■
P:\Duke Energy Progress. 1026\00 GIS BASE DATA\Riverbe
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
—ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR BERYLLIUM IS 4 Ng/L
NO RESULTS EXCEED BACKGROUND CONCENTRATION IS 0.1 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-9
ISOCONCENTRATION MAP
BERYLLIUM IN BEDROCK GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

• � 269 •
• ♦
/ / Outfall GWA-10S
� /rm
215 M WO-64S �''
•
' 1
/ MW-13
91
•
MW-5S
/[[[ MW-2S-A 484 ♦
♦ ; 321 - ♦
/ ♦
♦ MW-6S ♦
♦ / 233 GWA-9S
227
♦♦/ ♦ GWA-2S
/ 517
MW-10
♦ ♦ 0000,
298
♦
.♦ ♦� .
�. �.'00, , •
■ MW-1S
Outfall 33/ 1540 00
• � � 549 ;4
♦
AB-ss
♦ 191
GWA-15S
GWA-11S C-is 101 „,..
♦. 33.5 j 215 B-7S* ,
C-2S 195 - -:♦. .: x
• 135
• I ♦ AS- SA*
• ■ GWA-12S 980 -
/ • 136
• ■ 900*
f
goo
■
♦ • •
"� GWA 23S ♦ ..
♦♦ p GWA-4S ND 3i#*
31.6 j ■ . . rvu "' x '�
`♦ r�� � ■ ;".,11 GWA-215
f v"� ■. Y fyt �`' err t t� 'a s Y
.rJ' a i.t .,.� ..�,,,
/ 27.21
■
. # #1
♦
♦ ♦ ■
'• I
♦
1-040
��
300 150 0 300 600
GRAPHIC SCALE IN FEET
synTerra
148 RIVER STREET, SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
www.s nterracor .com
c(> DUKE
'c ENERGY
DRAWN BY: J. ROBERTS DATE: 10/26/2017
PROJECT MANAGER: J. MAHAN
CAROLINAS
CHECKED BY: B. WYLIE
LEGEND
1�TOTAL BORON CONCENTRATION (fag/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
MONITORING WELL
ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
������■ BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR BORON IS 700 Ng/L.
BACKGROUND CONCENTRATION IS 50 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
' = HISTORICAL BORON CONCENTRATIONS SHOWN TO DEFINE PLUME SOURCEAREA.
FIGURE 11-10
ISOCONCENTRATION MAP
BORON IN SHALLOW GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

/
• �MW-15D
244 ♦ • ♦♦
• • MW-3D
289 ♦ ♦ ♦
MW-4D
•-
.. / ♦ ` AB-zD 363 GWA
i 00-9D 1�
428 31
0000,
`♦♦ GWA-8D '-�'�
117 ♦
•
/. ■ • ND BG-3D
`'' , ` ■ `
�/ #.000 .� 126
• r PTA-7D
♦ ND
f �
/ G7A-3D-
73.1 AB-8D
+ GWA-15D 430
80.9
am son MVV­7Dj
ND
/ • GWA-12D ASN3DD*^
110 ••1
1
• / f ND ND I ■
4 ,.._.._..V.
�.� /,;-L'
' ' I
� ♦ I
♦ / ■ ♦♦
BG
ND
synTerra
c > DUKE
ENERGY
♦♦ i ■ CAROLINAS
300 150 0 300 600
GRAPHIC SCALE IN FEET
148 RIVER STREET- SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
DRAWN BY. J. ROBERTS DATE: 10/26/2017
PROJECT MANAGER: J. MAHAN
CHECKED BY. B. WYLIE
LEGEND
1�TOTAL BORON CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
MONITORING WELL
ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR BORON IS 700 Ng/L.
BACKGROUND CONCENTRATION IS 50 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
DATAMAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATA TABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
* = HISTORICAL BORON CONCENTRATIONS SHOWN TO DEFINE PLUME SOURCEAREA.
^WELL HAS CONSISTENT ELEVATED PH DUE TO POSSIBLE GROUT CONTAMINATION,
RESULTS SHOWN FOR IMFORMATIONAL PURPOSES ONLY
FIGURE 11-11
ISOCONCENTRATION MAP
BORON IN DEEP GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

■
• Ns.
•
♦
♦ GWA-213R ♦ 1
ND
♦ GWA-2BRU^
777
0 , �.
• ♦ ♦� • ` 1�0 ��
• ♦ AB-3BR^ •
� vI,
■
00000
.• ♦• ` \
•� /• �• ` 514
GWA-3BR
43j
r•
♦• 0000
7rC 1BRU^
• • 51.7
Lool
woo
■
i
r�♦
♦ ♦ I
♦ • I
/ ■
♦ � L
synTerra
c > DUKE
ENERGY
♦♦ i ■ CAROLINAS
0
300 150 0 300 600
GRAPHIC SCALE IN FEET
148 RIVER STREET- SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHON E S64-421-9999
W W W.svnterracorp.com
DRAWN BY. J. ROBERTS DATE: 10/26/2017
PROJECT MANAGER: J. MAHAN
CHECKED BY. B. WYLIE
LEGEND
TOTAL BORON CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
MONITORING WELL
ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR BORON IS 700 Ng/L.
NO RESULTS EXCEED BACKGROUND CONCENTRATION IS 50 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
^WELL HAS CONSISTENT ELEVATED PH DUE TO POSSIBLE GROUT CONTAMINATION,
RESULTS SHOWN FOR IMFORMATIONAL PURPOSES ONLY
FIGURE 11-12
ISOCONCENTRATION MAP
BORON IN BEDROCK GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

♦
♦
s♦♦
♦♦0000
'T'
pf­
a k
�
�.y
♦ - J 1r J �,k 6 i ,�
+ '"¢t:�<^-'e4I ��"x.' "`>'
®�
GWA-10S
-'x '^ �,z,,,,.,_.,..'•
�..
0.097j
3.1
MW-4S
®
27
♦
53.5
1Q MW713.
♦`
ND
MW-2S-A
4.1 w
0.74
ASH BASIN '
SECONDARY
CELL
5�
M
ND
-9 ASH BASIN
0-79 PRIMARYCELL
047j,13 '�� ® 0.11j JAB-8
v ." — 8.2
..r-� C_1S ® - - -
■ 1.8 t... 0.331 -. C-2S ,r
• ND
a
• - , i i� .. GWA-6S
/ 15.8
•
GW8. 12S � • -
• 8.2
■
•
GWA-23S
1 r ■'
7AW
i
♦♦ + 'J1 GWA-20S
I, , xl/,r /Ij
♦� 10
sye ♦ ♦ I
♦ o
nWA!
}
DUKE
oo,.**/
'C> ENERGY.
It ■ , h CAROLINAS
0.19
ND
LEGEND
OTOTAL CHROMIUM CONCENTRATION
�'- ♦ ND TOTAL CHROMIUM NOT DETECTED ABOVE
+ ' OREPORTING LIMIT
OCHROMIUM (VI) CONCENTRATION (fag/L)
• `' CHROMIUM (VI) NOT DETECTED ABOVE
■■ — ■
REPORTING LIMIT
++ HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
• ■I I _ INTERMEDIATE CONTOUR
u ' ' APPROX. BACKGROUND CONTOUR
MONITORING WELL
ASH PORE MONITORING WELL
AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON —JD)
BG 2S
,�- ND ASH BASIN BOUNDARY
••—••■ COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR CHROMIUM IS 10 Ng/L.
BG-1S BACKGROUND CONCENTRATION IS 5 Ng/L.
O93
1.2
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATA OBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THE ASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
'• WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
'Y' "t., ,'•. DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
300 150 0 300 600 FIGURE 11-13
GRAPHIC SCALE IN FEET ISOCONCENTRATION MAP
148 RIVER STREET,SUITE220 CHROMIUM AND CHROMIUM (VI) IN SHALLOW
GREENVILLE, SOUTH CAROLINA 29601 GROUNDWATER
PHONE [phone]
www. "erracor .com RIVERBEND STEAM STATION
DRAWN BY. J.ROBERTS DATE:10/26/2017 DUKE ENERGY CAROLINAS, LLC
PROJECT MANAGER: J. MAHAN
CHECKED BY. B. WYLIE

r /-v`':,
�# ;,
�y. �].} 6 f vli16`
2h �
yI` �1{^+ � 2ce�.wf,�� ley �"�.`i t:. I •
fim 1 v � •
�w c •
r
•
•
GWA-3D
0.18 j
GWA-15D r AB-8D
♦.i i 0.23j I 0.41
GWA-11D •"'
• 3.2
•• C-2D
•
•
/ 1 0 GWA-12D
• 14 i B
MW-2D
MW-5
®
0.061 D r �, • 1.3
ND
0.63 ♦`
*
■ GWA-8D
; i„/�
—
1.6
1.5
i
4
� b
LEGEND
OTOTAL CHROMIUM CONCENTRATION
�' •
'
ND TOTAL CHROMIUM NOT DETECTED ABOVE
OREPORTING
LIMIT
OCHROMIUM (VI) CONCENTRATION (fag/L)
• ``{
■
CHROMIUM (VI) NOT DETECTED ABOVE
REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
3G-3D
INTERMEDIATE CONTOUR
ND
APPROX. BACKGROUND CONTOUR
MONITORING WELL
ASH PORE MONITORING WELL
"`-
AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
—••—••■ COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
���■ BOUNDARY
NOTES:
• I ■
• I I ■
♦♦/ • '- - GWA-22D , ..�■�-� L.■� ' �..�..�..�..
/ Q.
♦♦ ♦.�� .�
♦♦� ♦♦�♦ t�. w� ♦♦ 1.� ��.. �..�• ���
1. �.
♦ 1
• ♦ • I
♦ •
♦'` : / � � ■ ■ �► ` I f .,.. - � 300 150 0 300 600
/� • ; GRAPHIC SCALE IN FEET
♦�� synTerra 148RIVER STREET, SUITE 220
/ ♦ f GREENVILLE, SOUTH CAROLINA 29601
• PHONE[phone]
♦ / ' • ' (> DUKE WWW- nterracor .com
♦ DRAWN BY. J. ROBETS
/ ♦ I 1 ENERGY PROJECT MANAGER . MAHAN DATE: 10/26/2017
It CAROLINAS CHECKED BY. B. WYLIE
■ M
P:\Duke Enerav Pro ress.1026\00 GIS BASE DATA\Riverbenc
THE NORTH CAROLINA 2L FOR CHROMIUM IS 10 Ng/L.
BACKGROUND CONCENTRATION IS 5 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THE ASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-14
ISOCONCENTRATION MAP
CHROMIUM AND CHROMIUM (VI) IN DEEP
GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC

'ja���
�}s }
r,ao-4�:,
/
/♦ GWA-2BR
0.88 B
♦/
SIN, 0000
m,
Ns.
LEGEND
•
t .
•` LEGEND
=" 10TOTAL CHROMIUM CONCENTRATION
ND TOTAL CHROMIUM NOT DETECTED ABOVE ♦+ ■ OREPORTING LIMIT
OCHROMIUM (VI) CONCENTRATION (fag/L)
•`' CHROMIUM (VI) NOT DETECTED ABOVE
■� i ■
REPORTING LIMIT
♦+ HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
• ■/ INTERMEDIATE CONTOUR
■■` 0000
.�+ � APPROX.BACKGROUND CONTOUR
MONITORING WELL
• + ® ASH PORE MONITORING WELL
■-l..�..�•• � � SIN_ GWA-7BR
• , ♦� ,RYCELL: ASH APRIMAOSAMPLE LOCATION
2.9
GWA-3BR +/ }
a.�s � � � _" �""" - - -T. •^ %' ;,,� f "� ..+ _ • APPROXIMATE STREAM (NON -JD)
�♦ ND M ASH BASIN BOUNDARY
�.�—••—••■ COMPLIANCE BOUNDARY
.• DUKE ENERGY CAROLINAS RIVERBEND SITE
NOTES: ■ BOUNDARY
+• ♦ � - r � NOTES:
10000
• I ■
• I I ■
• • . - ----
♦♦�+Y .��� ■��
r
1.looe
/.
♦ 1
• ♦ ♦ I
♦ •
1.3
♦+ : / - � ■ ■ �► ` I f .,.. - 300 150 0 300 600
/� • ; �� GRAPHIC SCALE IN FEET
♦+` / I • f synTerra 148 RIVER STREET- SUITE 220
/♦ ♦ f GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
+` ♦ / ' • ' (> DUKE WWW- nterracor .com
DRAWN BY. J. ROBETS
+ / ♦ I 1 ENERGY PROJECT MANAGER . MAHAN DATE: 10/26/2017
It CAROLINAS CHECKED BY. B. WYLIE
AL ■ M
P:\Duke Energy Pro ress.1026100 GIS BASE DATA\Riverbenc
40.6
ECONDARY
THE NORTH CAROLINA 2L FOR CHROMIUM IS 10 Ng/L.
BACKGROUND CONCENTRATION IS 1.5 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THE ASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-15
ISOCONCENTRATION MAP
CHROMIUM AND CHROMIUM (VI) IN BEDROCK
GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC

■
MW-15 � ♦
• ♦ Outfall11,
5.
61 GWA-10S `♦
• ♦ _, 8.2 -
_. • •. MW-3S
/ GWA-1S MW-4S
1
21.2 y �♦`
♦ MW-2S-A 1.9. •
•
/ MW-6S
1
/ ♦ ki
♦♦ 29.7 `• .
■
♦ 23 •�_
0000, ' ■
♦♦�� ` • ♦�
.'/ ...'00, , • •
/ , ♦ BG-3S
0000
■
, S.-I. 65.5
Oullall
♦ • MW-9 [10GWA-7S ♦ ♦� .. 0.23 0.15
GWA-3S-A ♦ .+ ,.1 _ ;-;�c
31.1 AB-8S ` BG-2S
♦ GWA-15S 0.24 -
"' " ' 0.048 J
GWA-11S C-1S
♦ C-2S _
12861
♦
GWA-6S
• 10.8 0.24
■ GWA-12S .,,«� I_F7:[.Y
• 31.6
GW7.3 BG-1S 0.24
• ■ I 1
• 7.3
♦ GWA-4S GWA-20S 1.9 ■ ■ �
♦�
♦/ ♦ �� � ry. 0.62 2.2
♦/♦ ♦` tom,. \ /_ • •♦
♦ ® �4 T.
GWA-21S
12.1 M1,R1
% BG-
0.65
�
♦
`
300 150 0 300 600
♦
// �♦
♦
GRAPHIC SCALE IN FEET
�♦
♦
%/♦
1
synTerra
148 RIVER STREET, SUITE 220
■ 1
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
♦ ♦
♦• ' '
■ ,
c(> DUKE
WWW- nterracor .com
ENERGY
DRAWN BY J. ROBERTS DATE 10/26/2017
♦♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYUE
■ ■
P:\Duke Energy Progress.1026\00 GIS BASE DATA\Riverbe
LEGEND
1 ]TOTAL COBALT CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (I MAC) FOR COBALT IS 1 Ng/L
BACKGROUND CONCENTRATION IS 14.2 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-16
ISOCONCENTRATION MAP
COBALT IN SHALLOW GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

♦ � 5 -
/ GWA-15D
o.a71 j
♦♦ GWA-3D
/ 1.7
• GWA-11D
• � c-zD
too,
• 0.19
• 1 ♦
• r GWA-12D 0
/ • 98
■
MW-15D � ♦ !'
0.23 •
MW-4D
2
MW-5D
� MW-6D. •
I-6U r
36
ASH STORAGE
AB-2D 0.035j GWA-9D � �� . ♦
GWA-8D -�•�
0.016 j ♦
BG-3D
0.51
• f
♦ 0.036j
♦♦ �' r ♦�
41
40000,
%�♦ BG-
0.28
■
1
1
♦
BG-5D
/
■ ♦ ■
■
0.45
♦
`
300 150 0 300 600
♦
// �♦
• ♦
GRAPHIC SCALE IN FEET
��
%/♦
1
synTerra
148 RIVER STREET, SUITE 220
■ 1
•
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
♦•
♦ ♦
' '
■ ■
c(> DUKE
. nterracor .com
ENERGY
DRAWN BY J. ROBERTS DATE 10/26/2017
'♦
j
■
CAROLINAS
PROJECT MANAGER: J. MAHAN
CHECKED BY. B. WYLIE
■ ■
P:\Duke Ener Pro ress.1026\00 GIS BASE DATA\Riverbe
LEGEND
1�TOTAL COBALT CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
—ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES.
THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR COBALT IS 1 Ng/L
BACKGROUND CONCENTRATION IS 0.55 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-17
ISOCONCENTRATION MAP
COBALT IN DEEP GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

/
■
• .
GWA-1BRU
• 1
l E -.
•
f
/
♦ ♦ GWA-2BR `., ■
♦/♦ / o.oza� .`
I
/ `.
■ .�
,
• GWA-7BR
♦ .
ND
GWA-3BR
BG-2BR
• 1Ali,
.
■ ■ _ _
♦♦/ ♦ r ■
♦
♦ '
e
n5B
■
♦
`
300 150 0 300 600
�`
// �♦
♦
GRAPHIC SCALE IN FEET
■
♦,
i/♦
1 I
synTerra
148 RIVER STREET- SUITE 220
■ f
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
�•
♦ ♦
' '
■ ■
c(> DUKE
. nterracor .com
ENERGY
DRAWN BY: J. ROBERTS DATE: 10/26/2017
'♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYUE
■ ■
P:\Duke Energy Progress.1026100 GIS BASE DATA\Riverbe
LEGEND
1�TOTAL COBALT CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR COBALT IS 1 Ng/L
BACKGROUND CONCENTRATION IS 0.1 Ng/L
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-18
ISOCONCENTRATION MAP
COBALT IN BEDROCK GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

•
/
♦ ♦ MW-15
• Outfall
GWA-10S
1310
• •
MW-3S
246
•
/
GWA-1S
667
• •
Q270
•
I •
♦ ;
282
t
♦ GWA-2S
♦♦
/ 1820
MW-10
zozo
♦.
0000,
.'/ ...000,
♦
■
Los
♦♦. MW-13
22900
MW-5S
1.s 43.5 j • •
■
1
MW-6S �
272 1
•• I
/ •
MW-1S BG-3S
� / ♦`� • 31700
10215-02
• • MW9 r 180
514
GWA-3S-A .GWA-15S �€
154 M1,R1 2530 * i' °" A
521
u
r' GWA-11S 40500 ,r
• � 5790
r� ♦ h E.
/ . • C-2s 2
♦ 61.7L,.,0000
%
� M
• I ♦
GW$$12S
fry
ASH STORAGE
/ • I
• f■
♦♦ ` ♦ GWA-23S . � .. � ■ . V
♦ GWA-4S GWA-20S 136
♦� ♦ is '\� p' 60.5 585
♦ ♦ 4,. Sr y,r
♦ ■
'l B4S
26
264
■
. 1
♦
♦ ♦ ■ ■
♦ ♦ ■ ■ ■
#� I I
GWA-7S
ND
LEGEND
1ITOTAL IRON CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
eG-zs ASH BASIN BOUNDARY
ND
r
�. ��`� ••—••-COMPLIANCEBOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
BOUNDARY
Los
♦♦. MW-13
22900
MW-5S
1.s 43.5 j • •
■
1
MW-6S �
272 1
•• I
/ •
MW-1S BG-3S
� / ♦`� • 31700
10215-02
• • MW9 r 180
514
GWA-3S-A .GWA-15S �€
154 M1,R1 2530 * i' °" A
521
u
r' GWA-11S 40500 ,r
• � 5790
r� ♦ h E.
/ . • C-2s 2
♦ 61.7L,.,0000
%
� M
• I ♦
GW$$12S
fry
ASH STORAGE
/ • I
• f■
♦♦ ` ♦ GWA-23S . � .. � ■ . V
♦ GWA-4S GWA-20S 136
♦� ♦ is '\� p' 60.5 585
♦ ♦ 4,. Sr y,r
♦ ■
'l B4S
26
264
■
. 1
♦
♦ ♦ ■ ■
♦ ♦ ■ ■ ■
#� I I
GWA-7S
ND
LEGEND
1ITOTAL IRON CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
eG-zs ASH BASIN BOUNDARY
ND
r
�. ��`� ••—••-COMPLIANCEBOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
BOUNDARY
`e
MW 7SR
NOTES:
G7A-6S — Ad
1580
"-
ND
`•,,, 3 '. `,. -
THE NORTH CAROLINA 2L FOR IRON IS 300 Ng/L.
'iYr "♦
e "'
GWA-14S
BG-1S
BACKGROUND CONCENTRATION IS 593 Ng/L.
46.5 J P '"'� t �;'
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
■
• •
_.„„` f ''' x'` x't:'sF,
- ■ - -
DATAOBTAINED SPRING 2017.
— ` `
- . ,
•
2016 AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
`
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
'
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
'-
WELL SCREEN.
c(> DUKE
'c ENERGY
CAROLINAS
300 150 0 300 600
GRAPHIC SCALE IN FEET
148 RIVER STREET- SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
DRAWN BY. J. ROBERTS DATE: 10/26/2017
PROJECT MANAGER: J. MAHAN
CHECKED BY. B. WYLIE
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM FIPS 3200 (NAD83/2011).
FIGURE 11-19
ISOCONCENTRATION MAP
IRON IN SHALLOW GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

/
• 61.7 •
0 ��� �♦
300
• � MW-4D �` �♦
S.
/ 553 C
♦ •
420
�
MW-SD
111
3
hm
♦
/ ♦
/
B-2D
��i
1
♦
I
0000,
•
.
•
GWA-7D
f
133
GWA-3D
n
♦♦
GWA-11 D
♦ 406
GWA-15D
97.9
1571
B $D
2570
• �♦
M
C-2D
•
• 1
F•
/ ■
• 1
GWA-12D
1160
■
4.
,.
♦ •
" ■ • •
♦ r1
♦ ♦
�/
1
•
...
♦
BG-OSDt
91.2
/
■
` •
♦
300 150 0 300 600
// �♦
♦
GRAPHIC SCALE IN FEET
��
%/♦
1
synTerra
148 RIVER STREET, SUITE 220
■ 1
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
�•
♦ ♦
' '
■ •
c(> DUKE
. nterracor .com
ENERGY
DRAWN BY J. ROBERTS DATE 10/26/2017
'♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYUE
■
P:\Duke Energy Progress.1026100 GIS BASE DATA\Riverbe
LEGEND
TOTAL IRON CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR IRON IS 300 Ng/L.
BACKGROUND CONCENTRATION IS 56.3 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-20
ISOCONCENTRATION MAP
IRON IN DEEP GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

/ 20.1
• i 104u1tSI04 GW2 -2105
/ 726
• • MW-3S
G 20.4 S 120 r
• ILA'
l
I •
♦ ; 791
♦
/ GWA-2S
♦
♦
MW-10
♦0000,
♦ 879
♦
�.'00, , •
`
■ • MW-1S - ♦ / ♦ ♦ ■` . � - 2590
. ♦`
0000 ♦ Outfall 102 '-
■.�..�� '♦ ■ /5-02
• 167
♦
GWA-3S-A ` ♦�'
1290 M1 R1 �
t
MW-6S
48.9
GWA-9S
2280
AB-8S
GWA-11S ♦ GV172055 52.1
r 5650
C-1-s
• 1390 "f "
. ♦ C-2S�.;
♦ too,454 74,,r'
• GWA-6S MW-7SR
• GWA-12S / 667 20
•� I
♦
•
BG-3S
197
BG-2S
89.2
BG-1 S
• / ; — // i 1 GWAO_114S 31.9
• f
/♦♦ ` • GWA-23S .�..�■■�/ `-■ - - �..�■■
�■.
• GWA-4S GWA-20S 68.2 /,. ■ ■
♦ • ` 146 108 .. ♦ •
/ `♦♦ /�' .- GWA-21S
♦♦ ♦ - 128
•
♦♦ / •
♦
BG-4S
'l
t / 313
■
� ♦
`
1
300 150 0 300 600
. --_..
♦ // �♦
♦
GRAPHIC SCALE IN FEET
��
%/♦
1
synTerra
148 RIVER STREET, SUITE 220
■ 1
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
♦ ♦
♦• ' '
■ •
c(> DUKE
. nterracor .com
DRAWN BY J ROBERTS DATE: 10/26/2017
ENERGY
PROJECT MANAGER: J. MAHAN
'♦ j
■
CAROLINAS
CHECKED BY. B. WYUE
■
P:\Duke Energy Progress. 1026\00 GIS BASE DATA\Riverbe
LEGEND
1ITOTAL MANGANESE CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR MANGANESE IS 50 Ng/L.
BACKGROUND CONCENTRATION IS 478 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-22
ISOCONCENTRATION MAP
MANGANESE IN SHALLOW GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

MW-15D .. ♦
39 • ' ♦
• ND
■ 23.3 `
MW-5D
35.1
■
6.7
AB-2D GWA-9D � �� ■ ♦
21.2
'• I
-
11.5 , ♦
GWA-7D
ASH BASIN 7.1
PRIMARYCELL
IF
111 GWA-15D
CA TA WBA RIVER
53 B-8D
GWA-3D - 58AF
15800 CINDER
` GWA-11D •-�
50... r 4 w
6.
1370 kL to
..: C-2D 1 / 15
1
• • - I ® IMleN ,Ir
• / GW 312D
.�
• ■ ■ _ _
•
1 f
/ ♦ 1 r_
•
'"lag
♦
♦
■'�
w
♦
♦
`
300 150 0 300 600
♦
// �♦
♦
GRAPHIC SCALE IN FEET
�♦
♦
%/♦
1
synTerra
148 RIVER STREET, SUITE 220
■ 1
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
♦ ♦
♦• ' '
■ ■
c(> DUKE
. nterracor .com
ENERGY
DRAWN BY I- ROBERTS DATE: 10/26/2017
♦♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYLIE
■ ■
P:\Duke Energy Progress. 1026\00 GIS BASE DATA\Riverbe
LEGEND
TOTAL MANGANESE CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR MANGANESE IS 50 Ng/L.
BACKGROUND CONCENTRATION IS 7.9 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-23
ISOCONCENTRATION MAP
MANGANESE IN DEEP GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

•
■
i
1
♦ ♦ GWA-2BR . � ■
/♦ / za.z .`
I
0000,
••�♦ ♦♦�i r ♦�
� ' ♦ •
■ v
r
GWtl&
8^,t.. �O
/
grl�t'174�'4��'�i
LEGEND
1�TOTAL MANGANESE CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
BG-2BR ASH BASIN BOUNDARY
59.2
' ••—••- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
BOUNDARY
NOTES:
� O
% Ali,
_
♦♦/ ♦ r r _
♦ r
;��, ♦ —Y`
♦♦
♦
BG-SBRt
29.2
/
■ ♦ ■
` ■
♦
300 150 0 300 600
// �♦
♦
GRAPHIC SCALE IN FEET
��
%/♦
1
synTerra
148 RIVER STREET, SUITE 220
■ 1
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
�•
♦ ♦
' '
■ ■
c(> DUKE
WWnterracor .com
W-
ENERGY
DRAWN BY J. ROBERTS DATE 10/26/2017
'♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYUE
■ ■
P:\Duke Energy Progress.1026100 GIS BASE DATA\Riverbe
THE NORTH CAROLINA 2L FOR MANGANESE IS 50 Ng/L.
BACKGROUND CONCENTRATION IS 24.5 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-24
ISOCONCENTRATION MAP
MANGANESE IN BEDROCK GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

•
■
• ♦ Outfall ♦
/ i 104/5-04 ♦♦
52.2 GWA-10S `♦
• • MW-3S
/ GWA-1S MW-4S
• ♦ 53 145 �� ♦♦
• 1
/ MW-13
82 �
MW-5S
MW-2S-A 25.4 ♦ `� •
• 53.8
♦ '
/ ♦ MW-6S ♦
♦ /#
♦ 27.1 1
♦ GWA-2S `. ♦ ■
♦ 192 • •
0000,
89 ' ■ ♦
♦
•�� •�
• ■ ■ MW-1S B 9-SS
• MW-9 1M22 -�� GWA-7S
GWA-3S-A ' 145 .7 -
193 M1,R1
AB-ss �i BG-zs
♦♦ GW5S 622
849 �
GWA-11S r
c-zs
♦ .-� GWA-6S MW-7SR
♦ 8.6 3.1j +. a:�
� GWA-1ZS I_F7:[.Y
/ • 895 BG-1S
7.9
• f
♦♦ ♦ GWA-23S ..�..�■.V �.■���-.,�■.�.■ 'r��-� '^a
♦ GWA-4S LZ7 ,r
364
41
♦/ `♦�� t.. /I—�'�■.�..�• GWA-Y1S* z. rt'74
Z8 'r
. err g
♦ �: �� / .��.. ♦ ♦ n��&t,,t f"
.;fc"�'. / ♦ J�. off s + "/��'�ka �€� �n. �: `rF ,? ::n..
♦♦ tvj', �:- lro� ♦ � �rr �t� •��.� +��f' `. r7"" t, „a ^sue
"�: ♦ ♦ I J �s.a.x,.
♦ ♦ ■
BG-4S
'l
/ 237
1 �
♦ I
♦ ♦ ■
#� I I
LEGEND
TOTAL STRONTIUM CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
—■■—■■■ COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —� BOUNDARY
NOTES:
NO NORTH CAROLINA 2L OR INTERIM MAXIMUM ALLOWABLE CONCENTRATION
ESTABLISHED FOR STRONTIUM.
BACKGROUND CONCENTRATION IS 254 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
01 soo 150 o soo 600 FIGURE 11-25
GRAPHIC SCALE IN FEET ISOCONCENTRATION MAP
synTerra 148RIVER STREET, SUITE 220 STRONTIUM IN SHALLOW GROUNDWATER
GREENVILLE, SOUTH CAROLINA 29601 RIVERBEND STEAM STATION
DUKE WWW- nterracorcom
PHONE[phone] DUKE ENERGY CAROLINAS, LLC
e(> .
'c ENERGY DRAWN BY: J. ROBERTS DATE: 10/26/2017
PROJECT MANAGER: J. MAHAN
CAROLINAS CHECKED BY. B. WYLIE

/
■
MW-15D �, !♦
.. • •.. MW-3D
/ MW-4D
•
♦ 71.2
•
♦ ♦ MW-6D �
i 172 103
I
0000,
78 , ♦
0-00
■ • BG-3D
68
• GWA-7D
154
GWA-3D GWA-15D
2200 - 302 B-8Dlo
G 21511 D — 432 y ,
2150
� C_2D
11591
42.1
GWA-12D
/ • 1 525 -
•
♦♦/ I♦ GWA-22D •�•.�.■�■■�/ `•■ ■ '—■•����■■��_
:04
41
# *#, "00*
♦ ♦ BG4D
/ 11 212
■
f
♦
BG-SDt
/
■ ♦♦ ■'.
■
717
## ♦
` 1 1
300 150 0 300 600
♦`
// �♦
♦
GRAPHIC SCALE IN FEET
■
♦,
i/♦
1 I
synTerra
148 RIVER STREET, SUITE 220
■ f
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE[phone]
♦•
♦ ♦
' '
■ ■
c(> DUKE
WWW- nterracor .com
ENERGY
DRAWN BY: J. ROBERTS DATE: 10/26/2017
♦♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYLIE
■ ■
P:\Duke Energy Progress. 1026\00 GIS BASE DATA\Riverbe
LEGEND
TOTAL STRONTIUM CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
—ASH BASIN BOUNDARY
—••—••■ COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —� BOUNDARY
NOTES:
NO NORTH CAROLINA 2L OR INTERIM MAXIMUM ALLOWABLE CONCENTRATION
ESTABLISHED FOR STRONTIUM.
BACKGROUND CONCENTRATION IS 697 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
FIGURE 11-26
ISOCONCENTRATION MAP
STRONTIUM IN DEEP GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC

/
■
• .
GWA-1BRU
• 1•
/ /
♦
/♦
: �---
♦
`.
♦
GWA-2BR
•
■
`.
I
/
♦��
`
�
'
1 ♦
, ♦�
•
•
♦ ��
GWA-7BR
138
GWA-3BR
B
/
�
196
196
r
v i
1
• ■ ♦
Ali,
x
• y/
I-
,.: r . 'ter k #-.t9 ''.
-
♦♦�
�rr�.■��■��--
■�``�■■���s
♦♦/ ♦ r
41 ■
♦ �I — ■.�-.�
r�r
r
••�
♦�♦#
I/♦ �/� ♦ ♦
-
/l
G-5BR
■
■
-300
900
/%
# ♦
` 1
150 0 300 600
// �♦
♦
GRAPHIC SCALE IN FEET
��
%/♦
1
synTerra
148 RIVER STREET, SUITE 220
■ /
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
�•
♦ ♦
' '
■ ■
c(> DUKE
. nterracor .com
ENERGY
DRAWN BY: J. ROBERTS DATE: 10/26/2017
'♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYLIE
■ ■
P:\Duke Energy Progres0026100 GIS BASE DATA\Riverbe
LEGEND
TOTAL STRONTIUM CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
—- BOUNDARY
NOTES:
NO NORTH CAROLINA 2L OR INTERIM MAXIMUM ALLOWABLE CONCENTRATION
ESTABLISHED FOR STRONTIUM.
BACKGROUND CONCENTRATION IS 961 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
FIGURE 11-27
ISOCONCENTRATION MAP
STRONTIUM IN BEDROCK GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC

•
■
MW-15 � ♦
• ♦ Outfall104
46. GWA-10S `♦
• • MW-3S
S.
/ � G ND1S 24.2 M 3fi S ♦♦` ♦ ♦♦`♦
•
• • MW-13 -
/ MW-SS
MW72S-A 17 ` `♦ ♦
�♦
/ ♦ ♦ MW-6S
♦GWA-9S
♦ / 23 1
♦ ao.s
♦ 41 •
0000,♦ -■•
BG-3S
•, r�: �♦ ♦ MW-1S
• ` `.• �■ . . �� ■ ■ / ■ Outfall 102
• MW-9 /S-02
GWA-1700 M-A / ♦� 14.1 62
1700 6 /`
GWA-15S
246 AB-8S
VA-11 S
89.8.. 247
GWA-6 MW-7SR:
Nr
/ ■ GWA-12S
• • 184
/ ■ " 4 too � OF1 G 65) B
■
♦♦/ I♦ GWN20-9W3` ■ . ■ • �/ ` ■ ■ • ■M • • ■ ■ • f•
GWA4S DND
♦ 217
t-
'fo-';�:
BG-2S
0.87 j
♦ ♦
■
...
1
1.4
f
Ah
4
♦
` 1
300 150 0 300 600
♦`
// �♦
1
♦
GRAPHIC SCALE IN FEET
■
♦, i/♦
1 I
synTerra
148 RIVER STREET, SUITE 220
■ f
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
♦ ♦
♦• ' '
■ ■
c(> DUKE
. nterracor .com
ENERGY
DRAWN BY: J. ROBERTS DATE: 10/26/2017
♦♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYUE
■ ■
P:\Duke Energy Progress.1026100 GIS BASE DATA\Riverbe
LEGEND
OTOTAL SULFATE CONCENTRATION (mg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
—■■—■■■ COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —� BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR SULFATE IS 250 mg/L.
BACKGROUND CONCENTRATION IS 1.2 mg/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-28
ISOCONCENTRATION MAP
SULFATE IN SHALLOW GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

t
y
♦ A
i \ L
MW-15D � ♦ !♦
30.8 •
• MW-3D
26.1 `.
MW-4D
333
MW-5D
�s'7 MW 2D 44.1
ND'ert;,.
1
e- /♦ 35.7
tY'T
�. GWA-9D 1� • -.
♦ i ., B-2D 33
0000,
♦ 2"`t i
♦
♦♦ ♦� .
♦♦� ...0,
/ • •`
♦
• "N ■
r _
jGWA-3Dj �♦,O GWA-15D
1700 - 91.6 AB-8D
GWA-11D s'
♦♦ 1780
x
♦♦ 1000' C-21D j
� • 1
• r � GWA-12D 2.3
•
18.1 `• 1
�r r�
GWA-8D---�
23.8 ♦�
' r r
BG-3D
1.4
\i-7D
0.9 j
GWA-7D
2.9
/ 400 �✓ _
•
• ■
♦♦/ I♦ ' GWA-22D •��.�..�■■�/ `-• -----�••�.■�.
2.7 - � •
♦ •
000,
}
mi—
♦♦ •
E
♦ ♦
1
1
/ BG-4D
l` 18.1
•
1
,. ...
�
♦
♦
e
♦
♦
♦
BG-5D
/
■
•
19.6
300 150 0 300 600
■ ♦
mw
GRAPHIC SCALE IN FEET
.,
j,♦
1
synTerra
148 RIVER STREET, SUITE 220
■ 1
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
♦•
♦ ♦
' '
■ •
(' DUKE
www.svnterracorD.com
ENA'EO^v
RG
DRAWN BY: J. ROBERTS DATE: 10/26/2017
�♦
V 1.
PROJECT MANAGER: J. MAHAN
j j
■
CAROLINAS
CHECKED BY: B. WYLIE
■
P:\Duke Energy Progress.1026100 GIS BASE DATA\Riverbe
LEGEND
10TOTAL SULFATE CONCENTRATION (mg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR SULFATE IS 250 mg/L.
BACKGROUND CONCENTRATION IS 21.9 mg/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-29
ISOCONCENTRATION MAP
SULFATE IN DEEP GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

/
■
• .
GWA-1BRU
• 1•
� /##
1
/#
♦-
`.,
♦
GWA-2BR
■
•
• `'
I
0000,
,A
•
..00'
/ ■ ■
,
,
•
♦, r•
GWA-7BR
4.8
GWA-MR]
BG-2BR
463
41.1
. �•
�4
s
•
c.. ].
40
♦
♦ '
e
G-5BR
■
28.9
/
♦
`
300 150 0 300 600
�`
// �♦
♦
GRAPHIC SCALE IN FEET
■
♦, i/♦
1 I
synTerra
148 RIVER STREET- SUITE 220
■ f
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
♦ ♦
�• ' '
■ ■
c(> DUKE
. nterracor .com
ENERGY
DRAWN BY: J. ROBERTS DATE: 10/26/2017
'♦
PROJECT MANAGER: J. MAHAN
j
■
CAROLINAS
CHECKED BY. B. WYUE
■ ■
P:\Duke Energy Progress.1026\00 GIS BASE DATA\Riverbe
LEGEND
10TOTAL SULFATE CONCENTRATION (mg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR SULFATE IS 250 mg/L.
BACKGROUND CONCENTRATION IS 29 mg/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-30
ISOCONCENTRATION MAP
SULFATE IN BEDROCK GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

• ♦ Culall104
110 I ♦.
110 GWA-10S `♦
• • MW-3S
/ GWA-1S MW-4S
• ♦ 79 560 ♦. ♦'
' 1
/ MW-13
110 �
MW-SS
MW 2S-A 68 ♦
59f5f
••
7�' x
♦ z _� 113 ■
/r,r _x a �' ,♦ ♦ 1 . .
♦♦ . . GWA-9S ♦ 1
♦ � 50
♦/ ♦ GWA-2S ` , !.;.. `•. ■
♦ 119
♦ 130 • �
0000, A ♦•--•,
.�� ...'00' ♦ r y 50
Outfall
• 1021S-02
GWA-3S-A". MW-9 /160 GWA-7S 2410 � - 106 46
♦GWA-15S
445 AB-8S BG-2S
c . - 174 117
GWA-11S
C-1 S
341
447 .
C-2s .,
>, 108 �.
/ J GW 96-125 . .
• / ■ _ O 63115
• I ■
■
♦♦/ ! .. GW220S 8GWA-23S .�..�■■�/ `-• •----�••�.■�..
/ ` ♦ GWA4S q... 33
♦ • \♦
■yam
■
♦ ♦ N D -
♦ .� �, ,
B 4St 1'
47
�
♦ ` 300 150 0 300 600 . --_.. 1
♦ // �♦ ♦ GRAPHIC SCALE IN FEET
�♦ %/♦ 1 1 synTerra
148 RIVER STREET, SUITE 220
♦ ■ GREENVILLE, SOUTH CAROLINA 29601
♦ ♦ ■ ♦ • PHONE [phone]
■ ♦ c(> DUKE . nterracor -com
ENERGY DRAWN BY: J. ROBERTS DATE: 10/26/2017
PROJECT MANAGER: J. MAHAN
♦♦ j ■ CAROLINAS CHECKED BY. B. WYLIE
■ '
P:\Duke Energy Progress. 1026\00 GIS BASE DATA\Riverbem
LEGEND
10TOTAL DISSOLVED SOLIDS CONCENTRATION (mg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
—■■—■■■ COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —� BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR TOTAL DISSOLVED SOLIDS IS 500 mg/L
BACKGROUND CONCENTRATION IS 50 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-31
ISOCONCENTRATION MAP
TOTAL DISSOLVED SOLIDS IN SHALLOW
GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC

■
l
♦
♦
♦
.0000,
♦ ♦� . `
�.00'
' ■ . /,
MW-15D �,
128 • ' '= ♦
• MW-3D
MW-4D
1 ,`
r � Fz
f. ♦ ♦♦
t
op
`•
MW-SD
M 662D _ 192 ♦ •
R. ■
n B 2D ) MW-6DS GWBA-9D ♦ �� ■ ■
166 120 ' 1
r I
119 ♦
•
BG-3D
85
♦ �, � ?., w � GWA-7D
♦ �, K 109
/ GWA-15D
♦ GWA-3D 258 , ., * B 8D '
♦-_._ mar-■" ♦_. ,
GWA-11D 2570 �272
♦ � c-zD
♦ • 152�
♦ .-� �. MW-7D
• 1 ♦ Ar*': 29
■ GWA-12D -r . I
• • 772 # �+rr ra ♦ t
• ■ h�O�'O I• � ,.: • — . — � r'' x k J,,w,`Nt� f � �`, r�,id€y �.�c ,.:.
�♦ � � ...� '�� �t�-!!■ lA. A wo GWA-22D88
�
♦�♦ ♦�♦� �L �I - ■■�..� ��� _ ♦♦�
♦ ♦ 1
♦ ♦ BG4Dt `
/ 197 1 ti
♦ / ■ ♦ ■
BG-SDt ■
192 D6
♦ ` 300 150 0 300 600
♦ // �♦ • ♦ GRAPHIC SCALE IN FEET
�� %/♦ 1 1 synTerra
148 RIVER STREET, SUITE 220
■ GREENVILLE, SOUTH CAROLINA 29601
♦ ♦ ■ ♦ ■ PHONE [phone]
■ ` c(> DUKE . nterracor .com
ENERGY DRAWN BY: J. ROBERTS DATE: 10/26/2017
PROJECT MANAGER: J. MAHAN
'♦ j ■ CAROLINAS CHECKED BY. B. WYUE
■ ■
P:\Duke Energy Progress. 1026\00 GIS BASE DATA\Riverbe
LEGEND
10TOTAL DISSOLVED SOLIDS CONCENTRATION (mg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
—■■—■■■ COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —� BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR TOTAL DISSOLVED SOLIDS IS 500 mg/L
BACKGROUND CONCENTRATION IS 179 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-32
ISOCONCENTRATION MAP
TOTAL DISSOLVED SOLIDS IN DEEP
GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC

■
GWA-1BRU
• 1 '
•
•
/♦
` 1
♦ ♦ GWA-2BR `. � ■
4t`""�.�'-----
/ ■
#
# # #1
•
♦ ♦ ■ •
#� I I
♦
v�
GWA-7BR
103
LEGEND
10TOTAL DISSOLVED SOLIDS CONCENTRATION (mg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
BG-2BR ASH BASIN BOUNDARY
204
�••—••- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
BOUNDARY
NOTES:
THE NORTH CAROLINA 2L FOR TOTAL DISSOLVED SOLIDS IS 500 mg/L.
BACKGROUND CONCENTRATION IS 223 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
��
300 150 0 300 600
GRAPHIC SCALE IN FEET
synTerra
148 RIVER STREET- SUITE 220
GREENVILLE, SOUTH CAROLINA 29601
PHON E S64-421-9999
WWW- nterracor .com
c(> DUKE
'c ENERGY
DRAWN BY: J. ROBERTS DATE: 10/26/2017
PROJECT MANAGER: J. MAHAN
CAROLINAS
CHECKED BY. B. WYLIE
DATAOBTAINED SPRING 2017
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATAMAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATA TABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-33
ISOCONCENTRATION MAP
TOTAL DISSOLVED SOLIDS IN BEDROCK
GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC

r
'bk
py'�•
♦
♦
rN
♦♦/ L
♦♦/
♦
♦� ♦l
.000,• 1
• - .
GWA-3S-A ♦...
1.8
♦ GWA-15S
GWA-11S -1S"
♦. � 0.59 B C-1_s
♦ c-2S
too,
o.2),JB
• 1 •
• , � GWA-,zs
/ • 0.6 B
• f■
♦ ` •
• GWA-4S GWA-20S
♦ •41 T40
.
C
BG-1 S
i1 GWA-14S 0.14j,B
1 0.56 B
■
i BG
,.6
1
♦ .
e
♦
`
300 150 0 300 600
//
■ •
GRAPHIC SCALE IN FEET
j,♦
1
synTerra
148 RIVER STREET- SUITE 220
■ 1
GREENVILLE, SOUTH CAROLINA 29601
♦ ♦
■ • ■
PHONIE1164-421-9999
c(> DUKE
. nterracor .com
ENERGY
DRAWN BY I- ROBERTS DATE: 10/26/2017
PROJECT MANAGER: J. MAHAN
♦ ♦
■ ■
CAROLINAS
CHECKED BY. B. WYLIE
■ ■
P:\Duke Energy Progress. 1 026\00 GIS BASE DATA\Riverbe
LEGEND
1�T0TAL VANADIUM CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC O2L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
—••—••- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
BOUNDARY
NOTES:
THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR VANADIUM IS 0.3 Ng/L.
BACKGROUND CONCENTRATION IS 2.0 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-34
ISOCONCENTRATION MAP
VANADIUM IN SHALLOW GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

■
MW-15D � ♦ !'
.I: • ♦ MW-3D
/ �. MW-2D M88D. ♦ �♦♦
♦ 2.9 •
% ! MW-6D ♦
♦ � 5.6 3.9 GWA-9D � 1�
♦ AB-2D
3.3 1
I
0000,
`.♦ GWA-8D -�'
6.7 , ♦
••� • ' 1 ♦ •
/ ■ 1 • BG-3D
`♦' /♦• ` ■
♦ ` '� 2.2
0000
4ftop, ♦.
• GWA-7D
♦ 11.2
GWA-3D ♦♦
♦ 0.3j,B GWA-15D AB2D
2.
2.9
�026j,B
♦.
� c-zD
• • 4.9
DI
• ■ GWA- 22D
/ • 1 0.43 B _
•
3.5
41
1
♦ ♦
% �♦ BG
4.8
■
■
1
...
1
♦
BG-5D
/
■ ♦ ■
■
1.9
♦
`
300 150 0 300 600
♦
// �♦
• ♦
GRAPHIC SCALE IN FEET
��
%/♦
1
synTerra
148 RIVER STREET, SUITE 220
■ 1
•
GREENVILLE, SOUTH CAROLINA 29601
PHONE[phone]
�•
♦ ♦
' '
■ ■
c(> DUKE
WWW- nterracor .com
ENERGY
DRAWN BY J. ROBERTS DATE 10/26/2017
'♦
j
■
CAROLINAS
PROJECT MANAGER: J. MAHAN
CHECKED BY. B. WYUE
■ ■
P:\Duke Energy Progress.1026100 GIS BASE DATA\Riverbe
LEGEND
TOTAL VANADIUM CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR VANADIUM IS 0.3 Ng/L
BACKGROUND CONCENTRATION IS 12.0 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-35
ISOCONCENTRATION MAP
VANADIUM IN DEEP GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

•
• GWA-1BRU
:�..
1
♦ ♦ GWA-2BR `. • ■
• I
0000,
♦ A
♦♦ `i • ♦�
•�� + ' ♦ •
■ v
•
GWA-7BR
GWA-3BR
— ..♦
-2BR
�♦ ;1., e
0.69B
4 r e
too,
Ali,
Irk
♦♦/
♦ r ■
♦
■ ♦ ■
/
G-5BR
28 B
b
` ■
/
♦
300 150 0 300 600
�`
// �♦ ♦
GRAPHIC SCALE IN FEET
■
♦�
i/♦ 1 I
synTerra
148 RIVER STREET,SUITE220
■ f
♦
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
�•
♦ ♦ ■ ■
' '
c(> DUKE
WWW- nterracor .com
DRAWN BY: J. ROBERTS DATE: 10/26/2017
ENERGY
PROJECT MANAGER: J. MAHAN
'♦
j ■
CAROLINAS
CHECKED BY. B. WYLIE
■ ■
P:\Duke Energy Progress. 1026\00 GIS BASE DATA\Riverbe
LEGEND
TOTAL VANADIUM CONCENTRATION (pg/L)
ND NOT DETECTED ABOVE REPORTING LIMIT
HIGHEST CONCENTRATION AREA CONTOUR
NCAC 02L STANDARD CONTOUR
INTERMEDIATE CONTOUR
APPROX. BACKGROUND CONTOUR
2 MONITORING WELL
2 ASH PORE MONITORING WELL
O AOW SAMPLE LOCATION
APPROXIMATE STREAM (NON -JD)
—ASH BASIN BOUNDARY
-- - — - -- COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND SITE
— —- BOUNDARY
NOTES:
THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR VANADIUM IS 0.3 Ng/L
BACKGROUND CONCENTRATION IS 0.33 Ng/L.
DASHED ISOCONCENTRATION CONTOURS WHERE INFERRED.
DATAOBTAINED SPRING 2017.
2016AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA NRCS GEOSPATIAL DATA
GATEWAY (https://gdg.sc.egov.usda.gov/GDGOrder.aspx).
t CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION
PATTERNS, CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
DATA IS EXCLUDED FOR WELLS WITH MEASURED TURBIDITY GREATER THAN 10 NTUS
AND/OR HIGH PH VALUES THAT MAY INDICATE POSSIBLE GROUT INTRUSION INTO THE
WELL SCREEN.
PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
DATA MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALYTICAL DATATABLE NOTES
FOR QUALIFIER DEFINITIONS.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83/2011).
FIGURE 11-36
ISOCONCENTRATION MAP
VANADIUM IN BEDROCK GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

well ID
Gradient
Shallow to Deep
AB-01S to AB-01D 0.093
AB-02S to AB-02D
0.030
AB-08S to AB98D
-0.026
BG91S to BG91D
-0.001
BG92S to BG92D
0.006
BG93S to BG93D
0.002
GWA-07S to C;WA-7D
GWA-08S to GWA-08D
GWA-09S to GWA-09D
GWA-11S to GWA-11D
GINA-12S to GWA-12D
GINA-13S to GWA-13D
GWA-14S to GWA-14D
MW-07SR to MW-07D
MW-08I to MW-08D
MW-09 to MW-09D
MW-3S�MW-4S
� MW-2S-A AB-1S 1 M ♦W-5S
0.093 / e�p035
• " GWA-9S Q`B-2:
0.06 0303
b MW
s -0.021 G
-0.
MW-1S tip'
0.042 !'
NIW
,GWA-15S .10.000
4 AB-8S
0 �0.026
GWA-11S , . ,
0.020 Downwind U.0
-0.006 Upwazd
-0.060 Upward
0.015 Downwind Ir
0.021 Upwind •� .
0.001 Upwind • +
0.011 Downwind
0.022 Upwind
0.000 Upward +
0.024 Doaaxm-ind
0.005 Doaaxm-ind
0.042 Doaaxm-ind
0.047 Doaaxm-ind
0243 Upward
t3
0.019 Downwind
0.035 Upwind 9 'J
-0.021 Upwind
0.005 Downwind
0.027 Downwind
0.004 Unwind
Well ID
Potential Vertical
Dire
Grad ent
Bedrock
BG02D to BG02BR
BG05D to BG05BR
GWA 03D to GWA 03BR
GWA 04D to GWA 04BR
GWA 07D to GWA 07BR
GWA 20D to GWA 20BR
GWA 22D to GWA-22BR-A
GWA 23D to GWA 23BR
MW-07D to MW-07BR
MW-09D to MW-09BR
MW-15D to MW-15BR
AB-06S to AB-06BRU
C-01S to C-01BRU
GWA-01S to GWA 01BRU
GWA-02S to GWA 02BR
GWA-10S to GWAIOBRU
0.006
0.098
-0.056
-0.003
0.010
0.027
0.004
0.027
0.001
-0.016
0.013
0.178
0.127
-0.010
-0.055
0.000
BG-2S
0.006 /
15
0' G2S GWA-6S MW; 7SR /
,GWA-12S 0.007 / l0.005
0!021 0.029 BG-1S ,
GWA-5S GWA-14S 0.001
GWA-4S MVV-81 GWA-22S
0.008 / GWA-20S �0.027 j_y24,
0
_ GWA-23S
0.005
GWA-13S
BG-4S' -0.001 Aw
+
+ MW-1,5D,
• GWA=1;OS
IGWA-1S I y�
-0.0 '.
VERTICAL GRADIENT
BETWEEN SHALLOW AND DEEP
ZONES
" POTENTIAL VERTICAL GRADIENT
-0.243: UPWARD ( 1.0 foot per foot)
0
0.178: DOWNWARD (1.0 foot per foot)
f
,• GWA-2S . .. '. f •,,� . -.
/.1-0.055
MW'9D ; GWA-71D 1
16 I ,!
'ASH BASIN BG-2DPRIMARYCELL
+
C-1S' J
.m " • r
MW-7D
1'1�••/GGWAA-4D GWA-20D
s I -0.003 10.027
■
�� •��� RG�WA�;23DIGWA-22D
1A1. '
x �
■ / •
Uts
BG-5D98
.
VERTICAL GRADIENT
BETWEEN BEDROCK AND
OVERLYING MONITORING ZONE
LEGEND
POTENTIAL VERTICAL GRADIENT ( foot per foot)
MONITORING WELL
ASH BASIN BOUNDARY
r ASH BASIN COMPLIANCE BOUNDARY
DUKE ENERGY CAROLINAS RIVERBEND STEAM STATION BOUNDARY
NOTES:
1 WATER LEVELS WERE COLLECTED BY PACE ON 5/22/2017
2 SITE AERIAL ORTHOPHOTOGRAPHY IS DATED APRIL 17, 2014. IT WAS OBTAINED
FROM WSP
3 ADDITIONAL OFFSITE AERIAL ORTHOPHOTOGRAPHY IS DATED 2012. IT WAS
OBTAINED
FROM THE NC CENTER FOR GEOGRAPHIC INFORMATION AND ANALYSIS.
(hftp:llservices.nconemap.govn
4 PARCEL BOUNDARY WAS OBTAINED FROM THE NC CENTER FOR GEOGRAPHIC
INFORMATION AND ANALYSIS. (hftp:llservices.nconemap.govn
5 DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM FIPS 3200 (NAD83I2011)
6 PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS, LLC.
7 SURFACE/CONTOUR DATATRUNCATEDAT EXTENT OF SAMPLING DATA
0 435 870
GRAPHIC SCALE
1,740 2,610
Feet
47
synTerm
148 RIVER STREET, SUITE 220,
GREENVILLE, SC 29601
864-421-9999
www.synterracorp.com
POTENTIAL VERTICAL GRADIENT DRAWN BY: J. ROBERT:
-0.243: UPWARD ( 1.0 foot per foot) HECEED BY: B. ER J.
ROJECT MANAGER: J.
0
0.17& DOWNWARD ( 1.0 foot per foot )
3,480
�� DUNCE
I ENERGY.
, LIMAS
RIVERBEND STEAM STATION PLANT
MOUNT HOLLY NORTH CAROLINA
DATE 10/26/2017
FIGURE 11.37
VERTICAL GRADIENT MAPS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC
MOUNT HOLLY, NORTH CAROLINA

Antimony
Arsenic
10o
1000
_
0
e
1o0
I*
a+
=
10
O
i
u �
1 10
?'v
O
�+
Q
0
Q
0
0.00 500.00 1000.00 1500.00 2000.00 2500.00 3000.00
0.00 500.00 1000.00 1500.00 2000.00 2500.00 3000.00
Distance from Source (ft)
Distance from Source (ft)
Beryllium
Boron
10
18130
O
1600
or
m
1400
L1200
=
cJ�1000
U Im
Sao
U 7.
600
P aav
7
Co3. 200
m
m
v
0 _ _
0.00 500.00 1000.00 1500.00 2000.00 2500.00 3000.00
0 00 500.00 1000.00 1500.00 2000.00 2500.00
3000.00
Distance from Source (ft)
Distance from Source (ft)
Chromium
Cobalt
= 1ov
R l \ \
100
_
p
=
1Q
m 10 [}
Q
1
NJ
g
V =
V�
_ 1
E"
3
U�
a
0
M 0
y
O
U
�
V
0.00 500,00 1000.00 1500.00 2000.00 2500.00
3000.00
0
Distance from Source (ft)
0.00 500.00 1000.00 1500.00 2000.00 2500,00 3000.00
Distance from Source (ft)
0 Shallow Hexavalent Chromium Well
0 Deep Hexavalent Chromium Well
AL Bedrock Hexavalent Chromium Well
Note: Data presented may include lab -qualified results. Refer to analytical data table notes for qualifier definitions. Non -detect analytical results are plotted at the corresponding reporting limit.
LEGEND
FIGURE 11-38
148 RIVER STREET, SUITE 220
15NCACO2L
tip
GREENVILLE, SOUTH CAROLINA 29601
CONCENTRATION VERSUS DISTANCE
Standard
PHONE [phone]
FROM SOURCE - VARIOUS
Shallow
Well
www.s nterraco .com
CONSTITUENTS
DRAWN BY: KFOX DATE: AUGUST2017
PROJECT MANAGER: J.MAHAN
RIVERBEND STEAM STATION
i Deep well
�m
tavouT:
DUKE ENERGY CAROLINAS, LLC
P:\Duke Energy Carolinas Supplement 017\FHSCAMA
Compliance Support\CSA Supplement 201 TFigures\COI v
Bedrock Well
,..7 Y 1 ,Terra
I
MOUNT HOLLY, NORTH CAROLINA
Distance/COI vs Distance Fig

Iron
600
500
4j
L_ 400
4a .-%
= J
v 300
IM
_ :L
o..
V 200
_
0
,y 100
a
� T
0.00
500.00 1000.00 1500.00 200a.00
2500.00 3000.00
Distance from Source (ft)
Manganese
1000
0
4j
0
L
4j
= 100
d
= J
0
V �
01 =
10
_
m
_
� 1
0.00
500.00 1000.00 1500.00 2000.00
2500.00 3000.00
Distance from Source (ft)
Strontium
10000
0
4j 1000
L
_
_ Moo
o�
°1
V z
10
0
i
0.00
500.00 1000.00 1500.00 2000.00 2500.00
3000.00
Distance from Source (ft)
Note: Data presented may include lab -qualified results. Refer to analytical data table notes for qualifier definitions. Non -detect analytical results are plotted at the corresponding reporting limit.
LEGEND
FIGURE 11-39
148 RIVER STREET, SUITE 220
15NCACO2L
GREENVILLE, SOUTH CAROLINA 29601
CONCENTRATION VERSUS DISTANCE
Standard
PHONE [phone]
FROM SOURCE — VARIOUS
ShallowWelltip
www.synterracorp.com
CONSTITUENTS
DRAWN BY: K FOX DATE: AUGUST 2017
PROJECT MANAGER J. MAHAN
RIVERBEND STEAM STATION
Deep Well
synTerra
LAYOUT :
DUKE ENERGY CAROLINAS, LLC
P:\Duke Energy Carolina115. Riverbend\05.EHS CAMA
Compliance Support\CSA Supplement 201 TFigures\COIv
Bedrock Well
MOUNT HOLLY, NORTH CARO LINA
Distance/COI vs Distance Fig

Sulfate
300
0
250
L
=
zaa
r,
d J
c m
150
o
U
100
50
3
a
0.00
50a.00 1000.00 1500.00 20aa.aa
2500.00 3000.00
Distance from Source (ft)
Total Dissolved Solids
600
500
0
400
++ ^
= J
CM
300
=E
o ..
V
200
O
H
100
0
--- T_
0.00
500.00 1000.00 1500.00 2000.00 2500.00
3000.00
Distance from Source (ft)
Vanadium
1000
s
0
100
L
_
= J 10
o CM
V
1
_
0
0.00
500.00
1000.00 1500.00 2000.00 2500.00 3000.00
Distance from Source (ft)
Note: Data presented may include lab -qualified results. Refer to analytical data table notes for qualifier definitions. Non -detect analytical results are plotted at the corresponding reporting limit.
LEGEND
FIGURE 11-40
148 RIVER STREET, SUITE 220
15NCACO2L
GREENVILLE, SOUTH CAROLINA 29601
CONCENTRATION VERSUS DISTANCE
Standard
PHONE [phone]
FROM SOURCE - VARIOUS
ShallowWelltip
www.synterracorp.com
CONSTITUENTS
DRAWN BY: K FOX DATE: AUGUST 2017
PROJECT MANAGER J. MAHAN
RIVERBEND STEAM STATION
Deep Well
synTerra
LAYOUT :
DUKE ENERGY CAROLINAS, LLC
P:\Duke Energy Carolina115. Riverbend\05.EHS CAMA
Compliance Support\CSA Supplement 201 TFigures\COIv
Bedrock Well
MOUNT HOLLY, NORTH CARO LINA
Distance/COI vs Distance Fig

A
(SOUTHWEST)
RIVERBEND
PROPERTY
BOUNDARY
I
I
FILL —/
--i------------------
" as
FILLS
ASH
----------------i------------
Pa► mump-
SAPROLITE
WEATHERED ROCK
XCAVATED
SH
FILL
-------------- ------------1---------
SAPROLITE
BEDROCK
t <1
PRIMARY CELL
SECONDARY CELL
FORMER
INTERMEDIATE
DAM
TER IN
-----------
EXCAVATED
ASH _
ASH PORE
WATER
SAPROLITE
BEDROCK
A'
(NORTHEAST)
a a SECONDARY
DAM
RIVERBEND
PROPERTY
BOUNDARY
I
CATAWBA
RIVER
I
0 100 200 400
HORIZONTAL SCALE: 1" = 400'
LEGEND
VERTICAL SCALE: 1" = 80'
NOTES 5X VERTICAL EXAGGERATION
MW 12S
WELL IN SAPROLITE MATERIAL
1. WATER LEVELS TAKEN MAY22, 2017.
MW16D
WELL IN TRANSITION ZONE
2. ANALYTICAL DATA OBTAINED MAY22-26,2017.
MW 16BR
WELL IN COMPETENT BEDROCK
3. THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR ANTIMONY IS 1 µg/L.
ABMW 2
WELL IN ASH PORE WATER
4. BACKGROUND CONCENTRATION FOR ANTIMONY IS 1 µg/L WITHIN THE SHALLOW FLOW LAYER,
MY 1001
NCDEQ WATER SUPPLY WELL
1.1µg/L WITHIN THE DEEP FLOW LAYER, AND 2.9 µg/L WITHIN THE BEDROCK FLOW LAYER.
CONCENTRATION IN Ng/L
5. CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
•
GENERALIZED WATER TABLE
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION PATTERNS,
CONCENTRATION DOES NOT SUGGEST IMPACT FROM THE ASH BASIN.
♦
GENERALIZED GROUNDWATER
FLOW DIRECTION
ASH
0
ASH PORE WATER
SOURCE INFORMATION:
WEATHERED ROCK
ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2, DATED AUGUST 2016.
®
BEDROCK
CROSS SECTION LOCATION

A
(SOUTHWEST)
RIVERBEND
PROPERTY
BOUNDARY
I
I
ow ow
N N M M
as as as
-EXCAVATED _=
FILL - - - - FILL
_____=='-;ASH
----------- - o
' ASH_
FILLS ---------------- ,
----------------i-------------- - -----------1---------
--i-------------------
polo-
SAPROLITE SAPROLITE
WEATHERED ROCK
BEDROCK
PRIMARY CELL
SECONDARY CELL
FORMER
INTERMEDIATE
DAM
TER IN
EXCAVATED
ASH
ASH PORE
WATER
SAPROLITE
WEATHERED ROCK
BEDROCK
A'
(NORTHEAST)
a a SECONDARY
DAM
RIVERBEND
PROPERTY
BOUNDARY
I
CATAWBA
vp �y
r�+ram +rt 'art, RIVER
I
v
0 100 200 400
HORIZONTAL SCALE: 1" = 400'
LEGEND
NOTES VERTICAL SCALE: 1" = 80'
SX VERTICAL EXAGGERATION
MW 12S
WELL IN SAPROLITE MATERIAL
1. WATER LEVELS TAKEN MAY22, 2017.
MW16D
WELL IN TRANSITION ZONE
2. ANALYTICAL DATA OBTAINED MAY22-26,2017.
MW 16BR
WELL IN COMPETENT BEDROCK
3. THE NORTH CAROLINA 2L FOR ARSENIC IS 10 µg/L.
ABMW 2
WELL IN ASH PORE WATER
4. BACKGROUND CONCENTRATION FOR ARSENIC IS 1 µg/L WITHIN THE SHALLOW AND
MY 1001
NCDEQ WATER SUPPLY WELL
DEEP FLOW LAYER AND 2.9 µg/L WITHIN THE BEDROCK FLOW LAYER.
CONCENTRATION IN Ng/L
5. CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
•
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION PATTERNS,
GENERALIZED WATER TABLE
CONCENTRATION DOES NOT SUGGEST IMPACT FROM THE ASH BASIN.
GENERALIZED GROUNDWATER
FLOW DIRECTION
ASH
0
ASH PORE WATER
SOURCE INFORMATION:
WEATHERED ROCK
ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2, DATED AUGUST 2016.
®
BEDROCK
CROSS SECTION LOCATION

A
(SOUTHWEST)
RIVERBEND
PROPERTY
BOUNDARY
I
I
ow ow
N N M M
as as as
-EXCAVATED _=
FILL - - - - FILL
_____=='-;ASH
----------- - o
' ASH_
FILLS ---------------- ,
-----------------------i-------------- — -----------1---------
---i---------------®
SAPROLITE SAPROLITE
WEATHERED ROCK
BEDROCK
PRIMARY CELL
SECONDARY CELL
FORMER
INTERMEDIATE
DAM
TER IN
EXCAVATED
ASH
ASH PORE
WATER
SAPROLITE
WEATHERED ROCK
BEDROCK
A'
(NORTHEAST)
a a SECONDARY
DAM
RIVERBEND
PROPERTY
BOUNDARY
I
o CATAWBA
vp �y
r�+ram +rt 'art, RIVER
61 I
0 100 200 400
HORIZONTAL SCALE: 1" = 400'
LEGEND
NOTES VERTICAL SCALE: 1" = 80'
SX VERTICAL EXAGGERATION
MW 12S
WELL IN SAPROLITE MATERIAL
1. WATER LEVELS TAKEN MAY22, 2017.
MW16D
WELL IN TRANSITION ZONE
2. ANALYTICAL DATA OBTAINED MAY22-26,2017.
MW 16BR
WELL IN COMPETENT BEDROCK
3. THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR BERYLLIUM IS 4 µg/L.
ABMW 2
WELL IN ASH PORE WATER
4. BACKGROUND CONCENTRATION FOR BERYLLIUM IS 1 µg/L WITHIN THE SHALLOW
MY 1001
NCDEQ WATER SUPPLY WELL
AND DEEP FLOW LAYERS AND 0.1µg/L WITHIN THE BEDROCK FLOW LAYER.
CONCENTRATION IN Ng/L
5. CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
•
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION PATTERNS,
_GENERALIZED
WATER TABLE
CONCENTRATION DOES NOT SUGGEST IMPACT FROM THE ASH BASIN.
GENERALIZED GROUNDWATER
FLOW DIRECTION
ASH
0
ASH PORE WATER
SOURCE INFORMATION:
ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2, DATED AUGUST 2016.
WEATHERED ROCK
®
BEDROCK
CROSS SECTION LOCATION

A
(SOUTHWEST)
RIVERBEND
PROPERTY
BOUNDARY
I
i
as
FILL
CAVATED
FILL
ASH
ow
�� om�, f /
m Y Y Y
aaa ` ` ` ` `-_ - `_ _ -_-__---- = / =
JX
FILL
mmi
�__�� 1-
----------- ------------------------------------------------------
SAPROLITE �'�-SAPROLITE
WEATHERED ROCK
BEDROCK
LEGEND
MW 12S WELL IN SAPROLITE MATERIAL
MW 16D WELL IN TRANSITION ZONE
MW 16BR WELL IN COMPETENT BEDROCK
ABMW 2 WELL IN ASH PORE WATER
MY 1001 NCDEQ WATER SUPPLY WELL
+ BORON ISOPLETH IN Ng/L (BACKGROUND VALUE = 50 Ng/L)
BORON ISOPLETH IN Ng/L (INTERMEDIATE VALUE = 250 Ng/L)
CONCENTRATION IN Ng/L
_ GENERALIZED WATER TABLE
GENERALIZED GROUNDWATER
FLOW DIRECTION
ASH
0 ASH PORE WATER
® WEATHERED ROCK
® BEDROCK
PRIMARY CELL
EXCAVATED �-�
ASH
♦
WEATHERED ROCK
A'
(NORTHEAST)
SECONDARY CELL
FORMER
INTERMEDIATE DAM SECONDARY
ow
N N
mm
as r
DAM
�� I
RIVERBEND
PROPERTY
TER IN BOUNDARY
SIN
o pl CATAWBA
FILL
iiiiiiii
pp V y 01 AN, RIVER
ASH PORE
WATER
SAPROLITE
BEDROCK
NOTES
1. WATER LEVELS TAKEN MAY 22, 2017. PRIOR MOST RECENT ANALYTICAL RESULTS
HAVE BEEN USED FOR CONTOUR INTERPOLATION FOR ABANDONED WELLS.
2. ANALYTICAL DATA OBTAINED MAY 22-26, 2017.
3. THE NORTH CAROLINA 2L FOR BORON IS 700 µg/L.
4. BACKGROUND CONCENTRATION FOR BORON IS 50 µg/L WITHIN THE SHALLOW, DEEP, AND
BEDROCK FLOW LAYERS.
5. CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION PATTERNS,
CONCENTRATION DOES NOT SUGGEST IMPACT FROM THE ASH BASIN.
SOURCE INFORMATION:
ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2. DATED AUGUST 2016.
In
0 100 200 400
HORIZONTAL SCALE: 1" = 400'
VERTICAL SCALE: 1" = 80'
5X VERTICAL EXAGGERATION
CROSS SECTION LOCATION

A�
(SOUTHWEST)
RIVERBEND
PROPERTY
BOUNDARY
I
i
PRIMARY CELL SECONDARY CELL
ow
as
��
as
as
FILL
- - - - - -
EXCAVATED _=
FILL
FORMER
>_
_
o m w INTERMEDIATE
DAM
-----------------------
--------
------------ASH
t omy
J
f
ASH=
aaa
333 -----------------------
JX
._� WATER IN
FILL
BASIN
----------
-----------------
---------------------------- -------------------
—
_ -------- I
`► EXCAVATED
•
ASH
@ � '
7 ASH PORE
cmummSAPROLITE
SAPROLITE WATER
zm, SAPROLITE
WEATHERED ROCK
BEDROCK I WEATHERED ROCK1111111111
BEDROCK
A'
(NORTHEAST)
ow
SECONDARY
N N
DAM
mm
as
RIVERBEND
PROPERTY
BOUNDARY
I
O N
CATAWBA
RIVER
0 100 200 400
LEGEND
NOTES
HORIZONTAL SCALE: 1" = 400'
VERTICAL SCALE: 1" = 80'
5X VERTICAL EXAGGERATION
MW 12S WELL IN SAPROLITE MATERIAL
1. WATER LEVELS TAKEN MAY 22, 2017.
MW16D WELL IN TRANSITION ZONE
2. ANALYTICAL DATA OBTAINED MAY22-26,2017.
MW 16BR WELL IN COMPETENT BEDROCK
3. THE NORTH CAROLINA 2L FOR CHROMIUM (VI & TOTAL) IS 10 µg/L.
ABMW 2 WELL IN ASH PORE WATER
4. BACKGROUND CONCENTRATION FOR CHROMIUM (VI) IS 1.1 µg/L WITHIN THE SHALLOW,
MY 1001 NCDE Q WATER SUPPLY WELL
0.9 µg/L WITHIN THE DEEP FLOW LAYER, AND 0.16 µg/L WITHIN THE BEDROCK FLOW LAYER.
BACKGROUND CONCENTRATION FOR CHROMIUM (TOTAL) IS 5 µg/L WITHIN THE SHALLOW AND
CONCENTRATION IN Ng/L
DEEP FLOW LAYERS AND 1.5 µg/L WITHIN THE BEDROCK FLOW LAYER.
(VI = HEXAVALENT CHROMIUM RESULT/
S. CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
TOTAL = TOTAL CHROMIUM RESULT)
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
• GENERALIZED WATER TABLE
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION PATTERNS,
CONCENTRATION DOES NOT SUGGEST IMPACT FROM THE ASH BASIN.
GENERALIZED GROUNDWATER
FLOW DIRECTION
ASH
SOURCE INFORMATION:
0 ASH PORE WATER
ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2, DATED AUGUST 2016.
® WEATHERED ROCK
® BEDROCK
�_
FI(.IIRG 11_As
CROSS SECTION LOCATION

A — 00- A'
(SOUTHWEST) (NORTHEAST)
PRIMARY CELL
SECONDARY CELL
ow
as
��
as
as
FILL
- - - - - -
EXCAVATED _=
FILL
_____;ASH
FORMER
_
INTERMEDIATE
RIVERBEND
__=
`_
0 N_
� � �
M M M
rnrnm
DAM
ow SECONDARY
PROPERTY
ASH
>'
"`�
-_ '_- m m m
�—
a a a
a s DAM
o w
BOUNDARY - - -
--- --- --- --- -==='f
`='
a a
omy
mm Y Y Y
---- -- ---- -- ---- -- --
-
ASH
RIVERBEND
aaa
�_—��__>==sr�
-
'' ----
PROPERTY
JX
WATER IN
BOUNDARY
FILL
BASIN
-----
--- --------�--
--
EXCAVAASH
-
FILL
`b r :-,� CATAWBA
______----
�►
�►
`►
ram'+"ram 'v'rro� RIVER
g g
Itl"SAPROLITE
��
ASH PORE
SAPROLITE
�`
WATER
EN
a
Joo
SAPROLITE---
WEATHERED ROCK
BEDROCK
LEGEND
MW 12S WELL IN SAPROLITE MATERIAL
MW 16D WELL IN TRANSITION ZONE
MW 16BR WELL IN COMPETENT BEDROCK
ABMW 2 WELL IN ASH PORE WATER
MY 1001 NCDEQ WATER SUPPLY WELL
COBALT ISOPLETH IN Ng/L (IMAC STANDARD = 1 Ng/L)
CONCENTRATION IN Ng/L
_ GENERALIZED WATER TABLE
GENERALIZED GROUNDWATER
FLOW DIRECTION
ASH
0 ASH PORE WATER
® WEATHERED ROCK
® BEDROCK
WEATHERED ROCK
NOTES
1. WATER LEVELS TAKEN MAY 22, 2017.
2. ANALYTICAL DATA OBTAINED MAY 22-26, 2017.
3. THE INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC) FOR COBALT IS 1 Ng/L.
4. BACKGROUND CONCENTRATION FOR COBALT IS 11.6 Ng/L WITHIN THESHALLOW FLOW LAYER,
0.517 Ng/L WITHIN THE DEEP FLOW LAYER, AND 0.088 Ng/L WITHIN THE BEDROCK FLOW LAYER.
5. CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
DUETO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION PATTERNS,
CONCENTRATION DOES NOT SUGGEST IMPACT FROM THEASH BASIN.
SOURCE INFORMATION:
ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2. DATED AUGUST 2016.
BEDROCK
0 100 200 400
HORIZONTAL SCALE: 1" = 400'
VERTICAL SCALE: 1" = 80'
5X VERTICAL EXAGGERATION
CROSS SECTION LOCATION

A
(SOUTHWEST)
RIVERBEND
PROPERTY
BOUNDARY
I
I
ow ow
N N M M
as as as
-EXCAVATED _=
FILL - - - - FILL
_____=='-;ASH
----------- - o
' ASH_
FILLS ---------------- ,
---------------- i-------------- — -----------1---------
Em
SAPROLITE SAPROLITE
WEATHERED ROCK
BEDROCK
PRIMARY CELL
SECONDARY CELL
FORMER
INTERMEDIATE
DAM
TER IN
EXCAVATED
ASH
ASH PORE
WATER
SAPROLITE
WEATHERED ROCK
BEDROCK
A'
(NORTHEAST)
a a SECONDARY
DAM
RIVERBEND
PROPERTY
BOUNDARY
I
o "' CATAWBA
+ram +rt 5 ro� RIVER
i � I
0 100 200 400
LEGEND
HORIZONTAL SCALE: 1" = 400'
NOTES VERTICAL SCALE: 1" = 80'
5X VERTICAL EXAGGERATION
MW 12S WELL IN SAPROLITE MATERIAL
1. WATER LEVELS TAKEN MAY 22, 2017.
MW16D WELL IN TRANSITION ZONE
2. ANALYTICAL DATA OBTAINED MAY22-26,2017.
MW 16BR WELL IN COMPETENT BEDROCK
3. THE NORTH CAROLINA 2L FOR IRON IS 300 µg/L.
ABMW 2 WELL IN ASH PORE WATER
4. BACKGROUND CONCENTRATION FOR IRON IS 1,014 µg/L WITHIN THE SHALLOW FLOW LAYER,
MY 1001 NCDEQ WATER SUPPLY WELL
56.3 µg/L WITHIN THE DEEP FLOW LAYER, AND 125 µg/L WITHIN THE BEDROCK FLOW LAYER.
S. CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
CONCENTRATION IN Ng/L
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION PATTERNS,
• GENERALIZED WATER TABLE
CONCENTRATION DOES NOT SUGGEST IMPACT FROM THE ASH BASIN.
GENERALIZED GROUNDWATER
Now-*-
FLOW DIRECTION
ASH
- ASH PORE WATER
SOURCE INFORMATION:
WEATHERED ROCK
ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2, DATED AUGUST 2016.
® BEDROCK
CROSS SECTION LOCATION

A
(SOUTHWEST)
RIVERBEND
PROPERTY
BOUNDARY
I
i
i FILL —/
---i-------------------
�Q'Em
�� ow
PRIMARY CELL SECONDARY CELL
as as as
-EXCAVATED _=
FILL - - - - FILL
3=ASH FORMER
_ INTERMEDIATE
_________________________ 0 N- M M M
��� DAM
<_ wwm
ASH -----------------
-------------i-----
SAPROLITE ,,
WEATHERED ROCK
A'
(NORTHEAST)
SECONDARY
a a � DAM
RIVERBEND
PROPERTY
BOUNDARY
I
------------1---------------- - - �
Nowak. `► EXCAVAASH FILL pt+iv+r'v'rJ C RIVER
A
SAPROLITE AS WATER limmo-
®'
BEDROCK
LEGEND
MW 12S WELL IN SAPROLITE MATERIAL
MW 16D WELL IN TRANSITION ZONE
MW 16BR WELL IN COMPETENT BEDROCK
ABMW 2 WELL IN ASH PORE WATER
MY 1001 NCDEQ WATER SUPPLY WELL
MANGANESE ISOPLETH IN Ng/L (2L STANDARD = 50 Ng/L)
CONCENTRATION IN Ng/L
GENERALIZED WATER TABLE
GENERALIZED GROUNDWATER
FLOW DIRECTION
ASH
— ASH PORE WATER
WEATHERED ROCK
® BEDROCK
WEATHERED ROCK
NOTES
BEDROCK
1. WATER LEVELS TAKEN MAY 22, 2017.
2. ANALYTICAL DATA OBTAINED MAY 22-26, 2017.
3. THE NORTH CAROLINA 2L FOR MANGANESE IS 50 µg/L.
4. BACKGROUND CONCENTRATION FOR MANGANESE IS 481 µg/L WITHIN THE SHALLOW FLOW LAYER,
7.9 µg/L WITHIN THE DEEP FLOW LAYER, AND 24.5 µg/L WITHIN THE BEDROCK FLOW LAYER.
S. CONCENTRATION GREATER THAN CURRENT SITE SPECIFIC BTV BUT WITHIN THE
BACKGROUND CONCENTRATION RANGE FOR SIMILAR PIEDMONT GEOLOGIC SETTINGS.
DUE TO GROUNDWATER FLOW DIRECTION AND OTHER CONSTITUENT MIGRATION PATTERNS,
CONCENTRATION DOES NOT SUGGEST IMPACT FROM THE ASH BASIN.
SOURCE INFORMATION:
ORIGINAL CROSS SECTION BASE OBTAINED FROM HDR, CSA SUPPLEMENT 2. DATED AUGUST 2016.
TER IN
0 100 200 400
HORIZONTAL SCALE: 1" = 400'
VERTICAL SCALE: 1" = 80'
5X VERTICAL EXAGGERATION
CROSS SECTION LOCATION

W
4
gm 7 Da ff tjh'�'
AT. IV W
If i. ., PIP
f
Z. 1 7� 4�11,
LAL
_5
IS 17P.
4
It '"w
04
4"
k,
vNIM14 T . K . - -, N
:4- �,WZ
wk.. I r, ..,- - ;,. , - - , P� "o, _W1,
_4w z I t- -�p
ol
a kw
40 L9 TAM-
jx
N r el
4
4
ItION? e Y I
, ;�
­0 _j
Al
40
in
rv; 7
-or 16", Z,
n
�fp F ft
'q. 7
(AAK
e
ja
VIA!
.1.10 F.
j7 1 , . . m - . "
7­4f,
ht
w[, '. . .. t . !
0 1% , C .
1 A �Ar
A
­1- A N
�w
A. fe
M J
A
AN jT
, 4
�kn e)
L.0
4:
"7 p"
1w ;Vr-
Pj4
A f
7i A
-A 1,7
r Ai
w0ff
b �10'A 6�40
N *W k 1. 4c, A',: MW-15BR _.Lr.
ot
L
0 7T1 te eZp
IN
nt _07. j
A
i Jj,
ir
C. ;17
tz MW-15 MW-15D-A MW-12 9011 "1 oc
rl �ift 4-
Af
?IT �0 r7T
GWA-10BIlU
1�' ��Iwr
"k,
V
4;G7WAVIOS
AA
OUTFALL 104 S-4: pH= 6-7, Eh= NM,
_04F tl­ S b= NA, As= < 1, Be= NA, B= NA, 1�6` Qn-
q,
.k -
01
A.
71 M-4V Cr (Vl)= NA, Cr= <1, Co= NA, Fe= 1310, Mn= 726,
Sr= NA, SO4= 46, TDS= 110, V= NA
01�,
34
W.
-3S xN 400
T1. JMW
4,0e0oll �MW-3D TFALL 109 S-9: pH= 6-8, Eh= 397,
Akb= < 1, As= < 1, Be= NA, B= 354,
NA, Cr= <1, Co= NA, Fe= 302, Mn= 171,
A ib.
SO4= 29, TDS= 81, V= NA
c p I
GWA-1BRIJ MW-4S -r. A
Its
*40* *40*
OUTFALL 105 S-5: pH= NM, Eh= NM, MW-13
Sb= <0-5, As= 03 j, Be= <0-2, B= 490, 400
Cr (Vl)= NA, Cr= 1-8, Co= 461, Fe= 4600, Mn= 3100,
Sr= 52, SO4= 351, TDS= 101, V= 18 *40*
�SW-1: pH= 7-5, Eh= 1606, 00
Sb= 7-1, As= 129, Be= 0-5, B= 657, 100
Cr (Vl)= 0-2, Cr= 4-6, Co= 8-2, Fe= 6200, Mn= 164,
Sr= 1420, SO4= 871, TDS= 197, V= 747
-11DR
MW
S-19: pH= 7, Eh= 392, 04%*
Sb= <1, As= <1, Be= NA, B= 348, MW 5D
Cr (Vl)= NA, Cr= 1.31, Co= NA, Fe= 533, Mn= 78, 111111111111111111
- S NA, SO4= 37, TDS= 100, V= NA MW-2D -5S
r MW
MW-2S MW-2S-A
OUTFALL1O3/S-3:pH=5_57,Eh=NM, 444
Sb- <1 As- <1, Be= NA, B= 349, OUTFALL 110 S-10: pH= 6-7, Eh= NM,
Cr (Vl)= NA, Cr= <1, Co= NA, Fe= 140, Mn= 841, Sb= NA, As= <1, Be= NA, B= NA,
A Sr= NA, SO4= 49, TDS= 90, V= NA
Cr (Vl)= NA, Cr= <1, Co= NA, Fe= 375, Mn= 53, t1.IIj111/S-11:pH=6_7,Eh=39O,
Sr= NA, SO4= 4, TDS= 45, V= NA s= <1, Be= NA, B= 389,
< _A
Cr (Vl)= NA, Cr= < 1, Co= NA, Fe= 2 100, Mn= 3080,
14 Sr= NA, SO4= 16, TDS= 61, V= NA
MW-6S
OUTFALL 002
JASH BASIN (SECONDARY CELL)l MW-6
-F
"Opp W"'
ft "-Or
*41#*
L
OUTFALL 112 S-12: pH= 7-8, Eh= 3624,
Sb= 2-1, As= 3-2, Be= <0-1, B= 704,
�SECONDARY ASH BASIN: pH= 8, Eh= 4512,
Sb= 372, As= 726, Be= NA, B= 709, Cr (Vl)= 2, Cr= 2, Co= 038, Fe= 321, Mn= 208,
Cr (Vl)= NA, Cr= <1, Co= NA, Fe= 61, Mn= 19, Sr= 956, SO4= 807, TDS= 196, V= 17 4,#*
Sr= NA, SO4= 80, TDS= 170, V= NA
4
4
h= 373,
S111
40p
OUTFALL 106 S-6: pH= 6-8, E
Sb= < 1, As= < 1, Be- NA, B= 173,
Cr (Vl)= NA, Cr= 112, Co= NA, Fe= 1540, Mn= 5400,
Sr= NA, SO4= 46, TDS= 120, V= NA
SW-2: pH_ 7-7, Eh= 1558,
131, Be= 2-2, B= 626,
-:7- Sb= 7-9, As
Cr (Vl)= 012 j,D3, Cr= 6-6, Co= 406, Fe= 5450, Mn= 261,
Sr= 1390, SO4= 988, TDS= 189, V= 777
n
_1 -7: pH= 6-7, Eh= NM, 277-5--3m: pH= 687, Eh= NM,
AS�7 S
< 1, Be= NA, B= NA, Sb= NA, As= <1, Be= NA, B= NA,
_.AqCr (VI)- NA, 67 Cr (Vl)= NA, Cr= <1, Co= NA, Fe= 23!� 247,
.04�r�2_52, Co= NA, Fe= 642, Mn= 1
Sr= NA, SO4= 4, TDS= 49, V= NA
ISr= NA, -3, TDS= 75, V= NA
S-137 pH= 6.1, Eh= 337.2,
.76, Be= 0.084 j, B= 26.8 j,
Sb= <0.5, As= 0
0 FS-2 3� Cr (VI)= <0. 12 D3, Cr= 1.7, Co= 0.89, Fe= 3220, M n= 48. 1,
Sr= 27.5, SO4= 4.8, TDS= 63, V= 6.1
A3&z - k � T ..
11-4 0,
pi 1111111 - 411111
0
-.000
MW-1D AB-6BRU S-13A: pH= 6.8, Eh= 365,
Sb= <1, As= 2.54, Be= NA, B= <50,
Mw S Cr (Vl)= NA, Cr= <1, Co= NA, Fe= 13200, Mn= 352,
r__
gr 4% AB-6S AB-5S 4
Now
AV"
M, FOU-TF-A-LL-10-8-/-S-8-p-H-=-6-8,-E-h=-N-M-,-----]
00 100 OUTFALL 101/ S-1: pH= 5-8, Eh= N AB-5D JASH BASIN (PRIMARY=
00 100 Sb= NA, As= <1, Be= NA, B= NA,
BMW
JS�
S �1 ��,I:Ais
�8, Eh= 661.7, Cr (Vl)= NA, Cr= < 1, Co= NA, Fe= 3!: 1 ): Mn= 622,
1, Be= NA, B= 130,
Cr (Vl)= NA, Cr= <1, Co= NA, Fe= 4890 1700, Sr= NA, SO4= 60, TDS= 130, V= NA
or-- 1,4M, I Ljo= D t U, V = w-N 1, . , -,% . J. I
0 GWA-7BR
S-20: pH= 4.24, Eh= NM, 4:�,
Sb= <1, As= <1, Be= NA, B= 179, OUTFALL 102 /S-2: pH= 6-3, Eh= IN M,
_10�
GWA-3SA A
Cr (VI)= NA, Cr= <1, Co= NA, Fe= 9620, Mn= 2300, Sb= NA, As= <1, Be= NA, B= NA, r
Cr (Vl)= NA, Cr= <1, Co= NA, Fe= 180, Mn= 167, 1 JP Ow -R "wi
Sf= NA, SO4= 290, TDS= . 370, V= NA Sr= NA, SO4= 62, TDS= 160, V= NA GWA-7S ;-ffA . . . . . .
IL4
GWA-3BR 4d
N I w
"W" 'I"! f
3 0- 3m: pH= 7 21 Eh= NM TOES; 1, N M ow
<1, As= <1, B e= NA,
<50, Cr (Vl)= NA, Cr= <1, Co= NA, Fe= 132, Mn= 14,
NA, SO4= 3-8, TDS= 38, V= NA
GWA 3D 0
0 -8D
tE�D& AB
VIER MOUNTAIN ISLAND
SW-3: pH= 6-6, Eh= 1636, t h�
Sb= 0-24j,As= 3-7, Be= 0051j, B= 26-2j, *101 4.
;00-
P
Cr (Vl)= 0087 j,D3,M1, Cr= 1-9, Co= 096, Fe= 2180, Mn= 86,
'00?
Sr= 693, SO4= 3-8, TDS= 78, V= 64
K I "Ad A It,
El .1
lol*
000011- 0
ago 100 000, .00, &G.
CINDER STORA,
34 ;AR:E:A�>' 0'
00, 000*/
A 101*
A Iz -1
101* loo* .00"
V 4
000, , e- x .
- - - - - - - - - - - - - - - - - -
FC 2D]Sq
[Cq-2S t Cw,1 7A,
It- - 4,
t, 0",
A
w000l
ewo
-o
o
lo�
00000 M
7
__0 0VV
-6
,;1470' oo,
000* Ilk
4-- 0000
19
mcw2wail- �ai 0
000, .3 1 v
t
ILs
9�LB-7
GWA-6D U
GWA-12S
00, Pig
"N* 1004 p
-7S
W
4 a JASH STORA
A
P_ A 000*
101 001*
o!7
Art-
loo*
-z" 7i 1
.000* ool*
W4
GWA-12D q J1 b,
+
IFORMER CO �L PILEI q
3A
loll
lo,
R
A
15 1 - X Ti. /V 14D]
fzi Ce -.0- wl A
'A sp j' AA
M
4%
GWA-23S
jf V.
GWA-5S .4 - - -----
lip j �-5 D
_4 , , .-
A, it 000l 000l*
7
, W�L, ,
giff
.01 4
G -22D -4
WA BGSB
're
- 4i &
iWA-20BR -4
0501 V, - /0000,
.� 11, pl. ­-- . . _�.,L. 1_;
GWA-4BR
HENDERSON)-
CEMETERY m
-A -2 -!:�A:T 0
-M lot
OCG;W;A�::2 �Bl
1-11 1 - # A
^14
GWA-4S IG��A-201
kx
9 1 H
-177
_-A
GWA-22S
41 , H i
W
ki 01 A -It
LAL'a'
OD-AWr I . -
'irk.
All
vi;�
GWA-21BR
4,14
RBSWO02: pH= 7-6, Eh= 2559,
j0PA 4k i
J, As=0_3, Be= 0014 j,B, B= 59,
w ��,w w
vy;
1A . ,� t�:-
T Cr(Vl)=0-07j,D3,Cr=0-15j,Co=0-065j,B,Fe=96-1, 44
T, 40@
, ­� , j, - �3 #4 EEEEEE0wwqff_- iiiii,wii two' �PLLTj
1tw qFAw
&
A Sr= 356, SO4= 5-3, TDS= 53, V= 039
/*
_tAjj p
ALL 011
A OUTF "q G\NLL�j
1*6 aw V .0
Q'It ... . _ 1, . , .. , # p 'r k�._ ,
L
GWA-13D
il. 0 1,\ a
W.
IRB OO1_-�H=9_1,Eh=348,
1-5, Be= <0-2, B= <50,
pip
M G:W::A�-13S _Tmft
SbSW
0 j'A
1k. .
V _2 '40
I ;% . . 1� �u --. MAI
'IT MIS
Cr (Vl)= NA, Cr= 0-7, Co= 0-43j, Fe= 89, Mn= 20,
r i�,:,
mmM6 r= 23, SO4= 4-7, TDS= 32, V= 097j
00 . , I . .1.4 IF C 111111
Iz�l lk
L
. , t. .
p
A
113
j1% w IN
.-C, PN
0,
rig . ? j,
I I , . ,
§
44 �i
-3 o?r-
Tim- '11741
CUFF
;q_
08
IL
La..
BG-4D N
p INI-t
i AN
, of
Mid<
odor
A,-. 43
FIX
k led
1�121 7,0 f
A
40
pw . I I L
7 46 x
w
7
V"
L
4
10 . , . "N .1 . . I - _5
#001
010.
p
ow 6, 1 x7
/A
gu
j , j*',
�6 _.'41'
k4
POW W4
m iK AIM r.
L =00 &N ff'Wd�W40-­' m Of
__1 .. AA�z
fjf�1?4, r %, 0 T r, F �4Z
'n, P, wow
BG-5BR Ahk
11 -NIT $
B,
E
M
q.
A
01�1_ WS MIX �7
iw_ _oim
;4*1111 -
k
1­p
41, 5:e
t--'T8NM0ww1wN slat
r
_V1 0 ! "U -_ 11 iL��-, , 1. 1 11 1.,.,. - �w �
AI pgr
.44
4,
'Iwo.
�A& `144
Rf
4
47A
-k Rp� , Sw
tit
0
nat
Z GLEN VvA
jv
WAA
. . .... . itIMIL A
'A
A4 J
4�
4i A
144%�
5�
\;gmw
4
4t; 4 k, At
6
oo!�ilj -1
JA
r
®r, r
Mk,
0
Vwl. 4
KIWI"%
4%
Dlk
%;
Ak
L
A_
It All ANII
7.4 1 ­C-4.
K
r
LL4
t jaiii "JII
wN,
K"
'6 imlRlwm,
P,
4
V
"%Aw -v
a= -woet, lirw
ONE
ALL
N09
A $LAW,
ODWARD RIDGE DR A.
N.,
BROOKRIDGE DR
A.*R p
CU
x
u gt-�,
WA rERO,,
Wl"
V".
X.
Ohio W WW4
I 1_1
WMA
90S - ft�k��
91 ­­4,
aMi A., m4d A.L Y�
4F
**41,1 111%
-s' LEGEND
th
4 WELL IN SHALLOW ZONE PARCEL LINE DUKE ENERGY (APPROXIMATE) SOURCE NOTES
nHVP
NOT ALL UTILITIES ARE IDENTIFIED ON THIS DRAWING. THE UTILITIES SHOWN ON THIS DRAWING ARE VISUAL
WELL IN DEEP ZONE COMPLIANCE BOUNDARY UTILITIES SHOWN ARE APPROXIMATE.
1-A
T�v 4 V-11k: 15
TOPOGRAPHY IS BASED ON LIDAR BARE EARTH DATA OBTAINED FROM THE FRIS\NORTH CAROLINA FLOOD
ASH BASIN WASTE BOUNDARY
WELL IN COMPETENT BEDROCK ZONE
RISK INFORNATION SYSTEM AT
APPROXIMATE STREAM (NON -JD) http://fris.nc.gov/fris/Download.aspx9FIPS=031&ST=NC&user--General*/`2OPublic AND
A DRAWING TITLED AERIAL TOPOGRAPHIC SURVEY-RIVERBEND STEAM STATION BYWSP, JOB NUMBER
VIV
WELL IN ASH PORE WATER
7 157002.000 AND DRAWING FILE NAME APRIL 2014_RIVERBENDFINAL 10-30-15.DWG
-JD)
APPROXIMATE POND OR RESERVOIR (NON
WELLABANDONED SAMPLE LOCATIONS WERE OBTAINED FROM HDR INFORMATION AND MAY BE APPROXIMATE IN SOME CASES.
W T 0 FFB--dl SURFACE WATER SAMPLE LOCATION SURFACE WATER FLOW DIRECTION DATA NOTES- TICAL DATA TABLE NOTES FOR
010001 ONGOING ASH EXCAVATION AREA DATA PRESENTED MAY INCLUDE LAB -QUALIFIED RESULTS. REFER TO ANALY
QUALIFIER DEFINITIONS.
oc'
"VA
ip Q1 [9 FSW 2 PONDED SOURCE AREA WATER
DATA SHOWN ON MAP IS THE MOST RECENT DATA AVAILABLE THROUGH Q2 2017.
Uqp
0 FS-161 AOW LOCATION
-NIT
114
w
L
`ixol
/*
7
0,
�,N
L e
COO,
ALL:
&Z­
qS AQ��*.vm_
All
4
FKO-_1j PERMITTED NPIDES OUTFALLS
SOIL OR GEOTECHNICAL BORING
400
0
raw
A solil
EWE
NA=NOTANALYZED
NM=NOT MEASURED
WATER, SEEP AND OUTFALL KEY
SAMPLE OCATION ID: pH (S-U-), Eh (mV),
Sb=Antimony (ug/L): As=Arsenic (ug/L): Be=Beryllium(ug/L): B= Boron (ug/L):
Cr (VI)=Hexavalent Chromium (ug/L): Cr=Chromium (ug/L): Co=Cobalt (ug/L): Fe=Iron (ug/L): Mn=Manganese (ug/L):
Sr=Strontium (ug/L): SO4=Sulfate (mg/L): TDS=Total Dissolved Solids (mg/L): V=Vanadium (ug/L)
rra
148 River Street, Suite 220
Greenville, South Carolina 29601
864-421-9999
www.synterracorp.com
DRAWN BY: JOHN CHASTAIN FDATE7 10/20/2017
CHECKED BY: BILL WYLIE DATE: 10/20/2017
LAYOUT NAME: FIG 14-52 (WATER & AOW)
GRAPHIC SCALE
200 0 100 200 400
(IN FEET)
ENERGY
CAROLINAS
RIVERIBEND STEAM STATION
175 STEAM PLANT RD
MOUNT HOLLY, NORTH CAROLINA
FIGURE 14-52
COMPREHENSIVE WATER,
AOW AND OUTFALL DATA
DATE PRINTED- 10/27/2017 12:54 PM FILE PATH-P:\Duke Energy Carolinas\15- Riverbend\CSA UPDATE OCT 2017\DE RIVERBEND CSAUP BASE MAP_dwg