Cliffside Errata 5-5-20

161P
synTerra
CORRECTIVE ACTION PLAN
UPDATE
REVISED: APRIL 23, 2020
Site Name and Location:
Cliffside Steam Station
573 Duke Power Road
Mooresboro, NC 28114-7754
Groundwater Incident No.:
Not Assigned
NPDES Permit No.:
NC0005088
NCDEQ CCR Impoundment Ranking:
Active Ash Basin
Low -Risk
Former Units 1-4 Ash Basin
Low -Risk
Unit 5 Inactive Ash Basin
Low -Risk
Date of Report:
December 31, 2019
Permittee and Current
Duke Energy Carolinas, LLC
Property Owner:
526 South Church Street
Charlotte, NC 28202-1803
[phone]
Consultant Information:
SynTerra Corporation
148 River Street, Suite 220
Greenville, SC 29601-2567
[phone]
Latitude and Longitude of Facility:
N 35.209267/W-81.761258

FIGURES

A
(SOUTH)
- AN
(NORTH)
ACTIVE ASH BASIN —I
ILn In POSSIBLE RADIAL GROUNDWATER FLOW
N N IN THIS AREA n rn c
CCR oaD
�
800 3 m m N a s rn rn B6 � Q m 800
2 s Li LO
a
3 U a ��
� m mmmm m mm m L) mm
A6N mm aaaaaa aaa so 22 �a�
a a WATER IN BASIN AB 04UA15 ASH SAPROLITE TDS 84
------------ -
__
-----------------------
-- B zB13 -_- —TER BASIN
-------------------------------------- - _
__s__
��--------------------- Aaass --------------
----------------------------------- - --- ---------- --- ----- ---
-----------------------------------
750 nNrvu-os=____�__�__�____— = e B3ao _=-=�===�================ _�_-== soa 12s _=_-_=_== - Across B 2ts 750
GWA-25S B <50 ___ - - _ __ _= Li ID3 _ __ ___ _-TDS __ __ ____ _____ 8 5910 _ __ __ _ _ ______ __ _ __ __ _ _ _
___________ __
e <so D L1 ______ m -ASH PORE WATER -=====_== ---- _ _ LI lob =___-_ __-_ __-_ __ — \ , B so
s04 SAPROLITE - _____- _= TDS 377 ________ = A&��ss ___ _= SAPROLITE 504 739 ______ ____ ____ _____ / _
504 60
<1 - _ _ _ -- -- -- -- Li 25
_ _ ______________ __ __ __ _____ __ _ B 606 r _________________ TDS 189 \— / __ Li 14.5 TDS 415
\ so4 1 ros 3a = =�=== _====� ' soa a
TDS 3$ TRANSITIONZ ___ ___ __ ___ ___ ___ ____ _____ _____ rylyy-70D
- ♦ - \ / /� \ \ B A&O8D pool-
� _ 504 1 — B A&09Dn ,` N N N N
700 \ K I / \ \ / I / \ = TDS 77 I / \ Li 3.4 TR ZONE
/I so4 16 7 i \~�q� FILL Q Q Q Q 700
AB045L `/ •/�/\II ros 4s / /1�-T w / ��1�1'/♦/ i /� C9C9C9t�9 ,;—ALLUVIUM
/ e Lwb _ / � .v / 1
34 Ae-oeeR /—� — / `—_ //♦ 56.5
ac50 /. / \I — \/ _\'♦. //\� \ \,\. / \I r,--♦/\ —�\�/ — /� —1'/
BROAD RIVER <50 31 00
65T 00 172
0 650 \'/ — \ 1'/ — \ —\ ? soa 5 \ —\'/ \ —\'/ A8-o4s — \ —\�/ — / 1 \ ` ram/ \/\ /1 / I/\ �/ �/ / \//\ / I/\ GWA-zu 650
— / ` �� / \ / �' \ _ / \ \ ♦ / so4 1s ♦ — / \'/.—_ / / — \ i I \
\�>w l / / \� \ / I / \— l / I / \— / / / \� \ zs13 / / i \ / I ♦ — \ / \— 1'/.-- \ � /— \ � / —�\ B
\ , i \ I _ \ , i \ , i \ I \ , I \ ros uF \ / / l \ / I \ l / / I ♦ / I ` / — — 8 1s6
14`/—/\I \/I 1\/ /\I ♦/\/\I 127
♦/\/ I/1 /\I ♦/`/\��; I♦/\/—\,♦/—_/ /�_IY \ 1 Li L9\/1
_
Q - ��/ \ \ / / 1 — 1 ' n AB-04BR I i /_ — \ % i' `♦— \ \ 1 e aoa / a
\/� / I / / \ / I � \�� \ / I' / \ / I � \/� \ / Irk// / \ / I � \/� \ - / \/� B \ ♦ y — 1' \ � / — ` ` /\ / \ so4 36 i I / _ / 'ros zaD S� / Z
/ \ I �� / _ I ♦ / / \ I ` / _ I \ / / \ I ` / _ I \ / / \ I ♦ A&MD / / \ . Li SS I �f�, / I / \\ / I ��1►Y 302 \ I 1 AB-018ROR \ / GWA-naR
Z 600 <so \ soa 4 / 1 / / \ / — ` I ` / — \ fd / — \ — \ ' / — \ \ 8 397 / / — 600 Z
O BEDROC)i'!.' \ — \ i /\ \ \ \ 1 /♦ / \ — \' /\ \ /\—/ sofa <1 \ \ j TDS 120 \ \ i' 1 / \ ; /; 1 / \ / \f / 1 / /r{ `�'� i`./ I \\ \� /I \� \ 1 / /� Li 6.9 \ \ Li 7.0 / \♦/ I O
\_ %./I/`\�i/I \ \�./ �\'i /I ` %./I/\�f',\/I \\ %./I/ ros 3D \ %./I—\\/ ',}�' / /\/I,\ j ♦i—� \/—\ I /♦/—/\I ♦/I soa a La t'� SO4 <1 /♦/
\ ./ — — `K\ ./ — _ I/—f\ ♦/ — — I \ _ \/—\ ♦ / I—\ \,\/ — / I \\/ \/\ /1 \ /1/ \/— I TDS 364 \/_ I
Q\/\II/1\\/\Il/1`/Il\I/1♦\/\/1/\/\I/1\/��,/I/1/�\/\I/1`���H/—/\I ♦/—\ I♦/♦�--\—\'/♦—\-1�/♦—_\— \ �`/1 ,./ ros 237 \/1 r
1- I !� I'/.— I Y. /�—�'`.— I /; —I \ /� 1 �\ /1/�\/\/1 /I/\ / / . /. \/I/\\-1.Y \—�.--\— -,/—
\ \i♦jj � F�/�\i♦j� � , / \i\j�''� ,I/ \i\jj �'T-• ,I/�\i\"/1 4 /�/_li� I \ ,♦/—lei 1 T� ,♦/_•i. � 1Z��,�/— \
W 550 ♦ /��� \�/ \ \/ �� ♦ / \ —\'/ —\ \ —1/ ♦ /,Y►i�\'/ —\ \/ �� \ / \ —\'/ —\ \ —\/ ♦ / \ —\'/ —\ \/ �� ♦ / \ —\'/ —\ \ — / 1 /\I 4/\/\ /1 /\/\I 1`/ \/\ /1/ \/ I swA-z1sm: /1/ 550
—/ —/ \ \ / / —/ \ \—/ / \ \ / / —/ \ \ - \/I�%�— \ /1/ /— / /— W
BEDROCK /I/\i� I/\� \/I/y`\/./ • \-1'/— \-1' \—I'/— \-1' \-1 / B 213 \
I \/— I ./ I ./— I ./ I ./— I ./ I ./— IO \/ I ./— I ./ I ./—\ I♦/./�\/\I/1\//�/ / \ ♦—/ ♦—/ `// — Li 9.8
W / 1 / / 1 / \ / \ / T� \ / \ / 1 / \ / \ / 1 \ / \ / 1 / \ I t \ / I / \ GwA-saBRt I \Lu
_ _�_ /♦_ram—\�/♦__�_ /`__\�/\_ \ /;1/.--\ /\/�\� _\/I 8 236 /\ _\/I♦/\�\\, SO4 z /\i-
/ i — \ /♦ \ \ /♦/ — — \ /♦—_ \ 1 /♦/ —� — \ /♦—_ \ — 1 / /`/\I TDS 268 / 1
\ I_\/i \/I/\/� ` I_\/i \/I/\/� ` I_\/i \/I/\/� ` I_\/i \/I/\/� ` I_\/i \/I/\/� ` I—`/i \/I/ _\�♦/—_/ \ /1/�— Li 43.S /
I♦/♦/I♦/\/I♦/\/I♦/♦/I♦/\/—\/I\/`/—\/I\/♦% \/\I/1\//—�—\�/♦—_\ 1/ SO4 21 --\—\�/♦�—;-1�/♦--\—\//♦�—%-
500 /1/ \/\/1 \/\/1/�\/\/1 \/\/1/�\/\/\ \/♦/1/�\/\/1 \/\/1/�\/\/1 TDS ias I \/�� I—\/i \/I/\/i� I \-500
/\—/ \ —_\'/\ � \ \ //♦—/ \ —_\'/\ \ \ 1 //`—/ \ —\'/\ � � —1 //♦—/ \ —\'/\ \ \ 1 //♦—/ \ —_\'/\ � \ 1 //\—/ \ —_\'/\ \ \ \ �/\\/ i, 1\ /�/\I/1\ /\/\I/1 � \/`I/1`/ \/\I/1\ /�/\I/1\/\/\I/1` /
\/I/\il\/I/\\� \/I/\il\/I/\\� \/I/\il\/I/\`� \/I/\il\/I/\`� \/I/\il\/I/\`� \/I/\il\/I/ \\,♦/—\—/\ /—/�-1'/—/\ /—/—1'/—/\ /—/�-1'/—/\-
`/\/\I/1��\/\I/1`/\/\I/1/�\/\I/1`/\/\I/1��\/\I/1`/�\/\I/1,
\ / \ — 1 /♦—_ \ \ `/ - \ — \ /♦—_ \ \ `/ - \ — \ /♦—_ \ - 1 / `/ - \ — \ / /`/ i l i l \ i l /♦/ i l i l \`/ i U
450 ,IF
RACTURES CONCEPTUALLY DEPICTED ON THIS CROSS SECTION REPRESENT GENERALIZED — \ / / — _ \ / . / — \ / / — — \ / • / _ \ / / I ♦ / —_ \ — \ ' /\—_ \ 1 ' /♦—_ \ — \ ' /� — s04 — 1 ' /\-- \ \ ' /♦ \ — 450
/ ORIENTATIONS OF FRACTURES OBSERVED BASED ON TELEVIEWER LOGGING. THE DEPICTED FRACTURE
/\ORIENTATIONS ACCOUNT FOR APPARENT DIP WITHIN THE PLANE OF THE CROSS SECTION, AND —\'/ —\ \ \'/\ / \ —\'/ —\ \/ \'/� / \ —\'/ —\ \ — / \/\/ 1`/��\I/�`/�/`I/1\/��\I/�\/ \/\ /1 /��♦I/�`/�/\I/1`/
\\VERTICAL EXAGGERATION. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO//I/\`/`/I/\/\\/I/\��/`/I/\/\\/I/y`�i\/I_\_/\_\'/—/\-1'/—/\—\'/—/;_\'/—/\-1'/—/\_\'/—/\
/ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTHS AND LENGTHS OF FRACTURES VERSUS DEPTH I j \ / \I / 1 ` / \ �I / ♦ / \ I / 1 ` / I / \ /� \ / \ I / 1 �/ I / \ / \�/ I / \\ i / \♦/ I / \ l \�/ / \\ i l \�/ I / \ / \\/ I / \` i / \ / I / \
/♦-ARE CONCEPTUAL ONLY. _ / — / \ /\_ / \ / / 1 / \ /\— / \ / / 1 / — 1 /.77
\ / \ / \ / ♦ / _ \ /I \ \ \ , . / _ \ /I \ \ \ , ♦ / _ ♦ /I \ /
400 400
NOTES:
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
TO JUNE 2019.
.. ;' FORMER
UNIT ASH BASIN ASH
-CLIFFSIDE\ �1 C STOR A
STEAM Ilt
STATION chi
UNITS /Y
3¢ INACTIVE
�N ASH BASIN
O�F9ROHp
CCP
LANDFILL
a 1-
ACTIVE I:
H BASIN J
NOTE:
CROSS SECTION A -A' IS LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
LEGEND
GWA 25S WELL IN SHALLOW FLOW LAYER
GWA 25D WELL IN DEEP FLOW LAYER
GWA 21BR WELL IN BEDROCK FLOW LAYER
AB-6S WELL IN ASH PORE WATER
— GENERALIZED WATER TABLE
GENERALIZED BEDROCK FRACTURE
ORIENTATION
GENERALIZED GROUNDWATER
FLOW DIRECTION
ASH
L—� ASH PORE WATER
® FILL
SAPROLITE
® TRANSITION ZONE
BEDROCK
ALLUVIUM
2. BORON (B) AND LITHIUM (Li) CONCENTRATIONS ARE IN MICROGRAMS PER
V
ASH PORE WATER ELEVATION
LITER (Ng/L)
3. SULFATE (SO4) AND TOTAL DISSOLVED SOLIDS (TDS) CONCENTRATIONS
ARE IN MILLIGRAMS PER LITER (mg/L)
SHALLOW GROUNDWATER ELEVATION
-
WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
V
DEEP GROUNDWATER ELEVATION
-NO DATA AVAILABLE
ANALYTICAL PARAMETER B Li SO4 TDS
BEDROCK GROUNDWATER ELEVATION
REPORTING UNITS 700 g/L uNE 250 Soo
15A NCAC 02L STANDARD 700 NE 250 S00
GWA-60RL
MEAN BORON (B) CONCENTRATION (ug/L)
BACKGROUND THRESHOLD VALUES
(SHALLOW FLOW ZONE)' SO 3 4 57
B
Li
236
MEAN LITHIUM Li CONCENTRATION �/ L
( ) (NH )
BACKGROUND THRESHOLD VALUES so 12 15 107
(TRANSITION FLOW ZONE)'
soa
43.5
21
MEAN SULFATE (SO4) CONCENTRATION (mg/L)
BACKGROUND THRESHOLD VALUES
TDS
348
MEAN TOTAL DISSOLVED SOLIDS (TDS)
SO 11 17 120
(BEDROCK FLOW ZONE)'
CONCENTRATION (mg/L)
UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
2010 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
WELL SCREEN
NE - NOT ESTABLISHED
COMPLIANCE BOUNDARY
�' DUKE
0 100 200 400
FIGURE 6-8a
GENERAL CROSS SECTION A -A'
ENERGY
HORIZONTAL SCALE: 1-400'
VERTICAL SCALE: 1"=80'
CONSERVATIVE GROUP
CAROLINAS
SXVERTICAL EXAGGERATION
MEAN OF BORON, LITHIUM, SULFATE AND TOTAL
DRAWN BY: J. CHASTAIN DATE: 10/22/2019
REVISED BY: D. KREFSKI DATE: 3/2/2020
DISSOLVED SOLIDS (TDS)
CHECKED BY: T. GRANT DATE: 3/2/2020
ACTIVE ASH BASIN
APPROVED BY: S. SPINNER DATE: 3/2/2020
CORRECTIVE ACTION PLAN UPDATE
PROJECT MANAGER: S. SPINNER
CLIFFSIDE STEAM STATION
synTem
www.synterracorp.com
MOORESBORO, NORTH CAROLINA
Rev. 1
23 April 2020

A
(SOUTH)
ACTIVE ASH BASIN
LO Ln POSSIBLE RADIAL GROUNDWATER FLOW
Nc� IN THIS AREA 0 Ln
800 �� g 7fJ/1NO m Nm G
�
ASH aaaaaa aaa
__z--- __ __ aaa WATER IN BASIN AB-04UA15 ASH
__---------------------------- As 923
_____________________ _____
�� _=-==_=-===-== _-�___] AB-0ss �� sr znB - =- - - - �--�-- -- Ae4a9s
750
CO
00
Q650
Q
Z 600
O
> 550
I.I.I
J
W
- AN
(NORTH)
� J
m
� N O
�-S IL)
iaa�
SAPROLITE
MW-1Q5
WATER IN BASIN WATER IN BASIN
800
GWA7255 QNNYHl6 ---- --- --- --- -- = As 323 = —_—_ —_— —_— —_— =-- ____ _____= u (total) O.Oo01 =__ _ —_ _ _ _ __ _ ___ = As 19bs = As al 750
AS '(11As <al =___ __ __ __ — _= Sr 2510 =__
(total) aam0 -ASH PORE WATER==_- - _ ___
u (total) QOD19=__—___—_______—__— V a3 ,� �
(total) SAPROLITE ___= -- V &9 __ __ = AS 184 -= SAPROLITE_-___-___ 1 \ / _ / `U (total) =
--------------------------
- __ ___ ____ -___- -___- -___- -___--________ - _ _ _ __ _ / \ J
___________________________
V <0.3_______________________________________________ Sr 3w A609D __ MW-IOD \ \ / AB-015
U (total) a0001 AS Q2 _ A5 <Ql / / / - / \ \ AS 0.3 :�i m m m
V L4 sr az TRANSITION / sr 51 I \ \ \\ /I / sr 32HHH4N N N N
\ _ i •/- \\� / I / \ / As al - I / \ I / \/ , u (total) aaool I / \ u!E �- OL- I / u RaraO aaoo3 700
`•�- ` ' \ / a ABML I . / \ / _ - v a3 ZONE / \ / �,( w'(\ / \ \ Q Q Q a
\/\>6d�_�/\I/\ \/\ As 169z /1 ' �► \'/.-'�-\ v as 3��� ALLUVIUM
AB 06BR/ Sr Iv / / / I \• / / /� Vr Vr Vr V'
I/\ / / / /�� I/\ / / / /�/IUtota amw '/-\\♦\'` ♦\-1'/-\\ /�/-\•'`/-_%\I` - BROAD RIVER
_ / ; `. /I - \ , •� ` As <a1 _ / \ \` /I - \ \' (v ) as.9 \. /I - \ \ , AB09BR \\/ / / \ I \ \/ / `\.� ri \ ` / _
_\ / _ ./
\ /'. / \I I / \I As a3 I \ ♦ / - \' I rj�/ �_ v ♦ �- / GWA-23500
1 / \ �.�\ / 1 (total) <o.000s 1 / \ / \ / 1 N` AB-M _ / _ /_I sr / \ _ �I. % \ I i ` /\/ \ / \\ ♦ \ Sr zw \ ` 65T 650 1
1, / As 926 / \\ \ '. ♦\u(taral) aaom /1♦�\ ).1, /\ / - \
Sr zm7 \\/ 1 / \`� / / I / v a3 \`/ / / \\/ I / \ // / / /\ / /I \ /� ♦I u(taral aooB6
tool i/ \\`•. s az v az AweEner01 \
`O/\/\I/1��/-/\I \/\i`rl 1/\I \/\/\I (total) 0.00061 \/\/\I /\/~� I\'\/-\�-� / ♦ _\Y/ r 256 \ sr 174 \/1
/ \ / 1 / r \ / 1 ( / \ / 1 als / 1 ABOImt \ 1 ,� I _ \ ' \-- \ Q
s 1 \ \ �'/ \ / \ / \ / 1 / I / \ / Gal)-
\/i AB-07D-.. I / \ / �\ r 1as I / \\ \ - / �y \ - \ \ \ /` / - \ /I � /\ /_-/ \I as AB-o16rt0.2
Sr a \/\ V _ ♦�/ �Y►Y \ I \- / /- _�\ \ Sr 268 / GWA-21BR
co. � � \ / 1 / \ I / 1
u(taraD <o.aoos i'1 uRaral) - 1' \ /
i�/I/\,!U(taral)< , /
\/\I/1i\I�/\I/1M•\►<I./\��/\I/1`
\ /\71
`,1�`-/` \AY `!1/; 7 7-`,,�\-1•:Y
14
—550
\ I \ LU
\-
i BEDROCKS
I;\
s�9,/I \•� s� s�\'�'\ w
/\-_ _ / / - 1 /.-_ \ _ / ♦ - \ /\-_ u (carol) <o.aooz I / \ / i \ I•j \
\ I_\/i \/I/\/�� I_\/i \/I/\l�� I_\/i \/I/\l�� I_\/i \/I/\l�� I_\/i \/I/\l�� I_\/i \/I/)_\/./--/� ♦�- - _�03 /�_ V o.3
/\�� \ -_\i/ -� � \1'/\�� \ -\%/ -� � `\'/\�� \ -1%/ -� � \\'/`�� \ -\%/ -� � `\'/\�� \ -\ i/ -� � \1'/\�� \ -\%/ -� � -\ i/\ \ \\;�\-� ♦I./\�-/\I/1��\/\I/1`/ \/\ /\ /�/\I/1` /\/\I/1�/ 500
_\/\/\\/\/1/\/\I/1`/\/\I/1/\/\I/1\/\/\I/\♦�\/\I/1`/\/\I/1/�\/\I/1\/�\ /1/ /I/\i/\/I/\`�� /I/\i/\/I As
\�- �- \-\/\--; \/\�- utaral - \/\I/1`
.FRACTURES CONCEPTUALLY DEPICTED ON THIS CROSS SECTION REPRESENT GENERALIZED / i 1 \ - / ` I _ \ - / ` I _ y _ \ / __/ _ ♦ __' _ / (total) _ _
/ORIENTATIONS OF FRACTURES OBSERVED BASED ON TELEVIEWER LOGGING. THE DEPICTED FRACTURE / /\I\/l' V \ i l /\/ l \\/ I i 450
/ORIENTATIONS /-�\♦�/-`-�'./-�\ice/I-\_\'�/-�\ice/1-\_\/�/-
ACCOUNT FOR APPARENT DIP WITHIN -1'/\ \-�//
\ 'VERTICAL EXAGGERATION. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO \� / I / \ \ /I \\� / I / \ ` /I \\� / I / y \ ' / - \ - \ /\ \ \ \ /\-♦ \ - \' /\ \ \ \ /� / \ - \' /\ \ \ \
/ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTHS AND LENGTHS OF FRACTURES VERSUS DEPTH
ARE CONCEPTUAL ONLY.-\'./.-\'\i/\--\�\'./.-\-li/�-\�\'./.-�\ vx/-, ♦/-�.I�'\/.-i.l �/-`.lam'\.-:.1..\/-`_lam/\.-:.1-'`♦
NOTES:
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
LEGEND CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
TO JUNE 2019.
2. ARSENIC (AS), STRONTIUM (Sr), AND VANADIUM (V) CONCENTRATIONS ARE
eR�go GWA 25S WELL IN SHALLOW FLOW LAYER V ASH PORE WATER ELEVATION IN MICROGRAMS PER LITER (pg/L). TOTAL URANIUM (U) CONCENTRATIONS ARE
Ri�FR IN PICMICROGRAMS PER MILLILITER (pg/m L).
GWA 25D WELL IN DEEP FLOW LAYER * WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
WELL IN BEDROCK FLOW LAYER SHALLOW GROUNDWATER ELEVATION MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
\ GWA 21BR
- NO DATA AVAILABLE
FORMER Q AB 6S WELL IN ASH PORE WATER V DEEP GROUNDWATER ELEVATION ANALYTICAL PARAMETER As Sr U V
`UNITS I4 _
ASH BASIN
-/ ASH - . REPORTING UNITS
pg/L pg/L pg/mL pg/L
CLIFFSIDEN 1, STORRAAGE _
GENERALIZED WATER TABLE
STEAM \ �`
STATION - AcnvE
GENERALIZED BEDROCK FRACTURE
UNITS
3
/ r ASH BASIN
����� ORIENTATION
GWA-6IBIa
ASH BAISINGENERALIZED
OUNDWATER
Sr 4
FLOW DIRECTION
u(taral) a rou
v <a3
ASH
ASH PORE WATER
FILL
'LANDFILL DFILL -
9aw . -
SAPROLITE
- - -
1
® TRANSITION ZONE
'--
NOTE:
i BEDROCK
-,"
CROSS SECTION A -A' IS LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
ALLUVIUM
-
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
BEDROCK GROUNDWATER ELEVATION
MEAN ARSENIC (AS) CONCENTRATION (ug/L)
MEAN STRONTIUM (Sr) CONCENTRATION (ug/L)
MEAN TOTAL URANIUM (U) CONCENTRATION (ug/mL)
MEAN VANADIUM (V) CONCENTRATION (ug/L)
WELL SCREEN
COMPLIANCE BOUNDARY
'DUKE
ENERGY
CAROLINAS
,4WA
synTena
15A NCAC 02L STANDARD 10 NE NE 3*
(SHALLOW FLOW ZONE)l 0.2 34 0.0005 1
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)' 2 69 0.0005 11
BACKGROUND THRESHOLD VALUES
(BEDROCK FLOW ZONE)' 1 93 0.0005 1
* - IMAC OF THE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
1-UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
2010 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019,
0 100 200 400
HORIZONTAL SCALE: V = 400'
VERTICAL SCALE: 1" = 80'
5X VERTICAL EXAGGERATION
DRAWN BY: J. CHASTAIN DATE: 10/22/20
REVISED BY: D. KREFSKI DATE: 3/2/2020
CHECKED BY: T. GRANT DATE: 3/2/2020
APPROVED BY: S. SPINNER DATE: 3/2/2020
PROJECT MANAGER: S. SPINNER
www.synterracorp.com
FIGURE 6-8b I
GENERAL CROSS SECTION A -A'
NON -CONSERVATIVE GROUP
MEAN OF ARSENIC, STRONTIUM, TOTAL URANIUM
AND VANADIUM
ACTIVE ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
CLIFFSIDE STEAM STATION
MOORESBORO, NORTH CAROLINA
Rev. 1
23 April 2020

A - A'
(SOUTH) (NORTH)
ACTIVE ASH BASIN -
Lo U, POSSIBLE RADIAL GROUNDWATER FLOW
M fV IN THIS AREA In m a _j
800 3 a
cw
_j -1� mmmmmm
mm aaaaaa aaa �aa�
WATER IN BASIN AB MATS ASH SAPROLITE
-------- -- _ _ ---
__________S____C. <al — _ _________ ____ERINBASIN
41k
WATER IN B IN-----T------
00
00
1
Q 650
'a
Z 600
O
Q
W 550
J
Lu
400—
Fe 144 ----------- _- Mn ________________________ _______=J J ___ _ _ _ _____ Fe 1I? _'_-�— 1 / \/i
/ Mn 165 SAPROLITE PORE WATER --------
ASH _-----------------
/
\ _ —___-_ _= TI <0.1_______________________ __ ________ � 5 ---- — SAPROLITE Mn 43 _____ __-- __-- __-- __- Mn 197 \ / — \ CCR-M
I GWA-255 __ _-- -- -- -- -- —____ AB-O6D .►_ TI 0.3 _ Co 12020TRZONE/ Mn 92 / 1�-06a6 ALLUVIUM
/ �7
w \ /\-/ \ _ \ / - \ \ / \ / Rs� \ I \ / Fe 1478-
_ / _\ / `/ -\ \/ `/ I_\\ \- / / 1 /\r\ /\ Mn MA5 BROAD RIVER
Co SLY /\/-\/\/ -\ I rl alI I \/ / I/ \ \ I/\ \ / I/ / ti� /\
\ / '�V 1 \ / \ I / \ ♦ \ / \ / 1 / \ �.\ / Fe aua 1 \ / \ I / 1 \ �� /� / \ ♦ / \ / 1 AB-a9BR \/ / \ \ \ / \ / ���_ \ — \� / — / \ — \ ' / rI as — 657'
Co 0.2
-1'/L�\-_\'/-♦\-1'/\-/\-1 ? Mn ®_ /\-\'/:�\-\ / AB -\ . /\ Fe 2035
/\
\�� I_)yi \/I/\�/ I \i \ I \i \/I/\�i Fe <s0 / /\ \ I Mn 91 \ l / i // /♦/� / ♦/ ♦/-\\ -\\
_\I♦/\/-\/���--\I..i-\\/�/-+.\ /-\\/\/-_\ ./-_\/�/♦/TI <0.1 //I/\/���/I_\/i�/I/\1/�\/\I/\ \c�i` I-M
\/\/\ \�,I/\�/\/\/1��/-/\I ♦/\��I 1♦/ /\I ♦/\/\I, Mn <5 ♦/\ \I/1 � � ♦/~� I ♦/-\ �/-- /�_\YjFe
TI <al / / \/1 /\ I / / 9187 _lFe s16___AB-010 / I / \/ i \� I / \\ \ y \ / — I \ / / y / - / - / - / - _ \ P. \ / ' / 1 \ / \ / \ \AB-018ROR/�J� /\\/\/1 /\\/\/1 /\\/\s.3 \ a uaa7 /\_\�/\ /-\- 1 Co 3.e
\ / 1 \ / 1 \ /1 Fe 5s / 1 _ / 1 / - t�1 /♦ / - \' \ _ \ / \ - GWA-21BR
/1�♦/\—\//�\\—\/ /\\/\/♦/\\ \/ Mn 180 ti\\\/ \ /\/\/1/ ��\/I/\\i i\/I/\\•\—/\ Mn 1555 / Co Fe 15
a4
BEDROC)i'A�\i/\/I/\\�� TI <al
-\% \/-��\%/♦--\ /\/�\/I\/♦/-\ I ♦/_— \ i�/I TI =\.! Fe 3630
`�t'���`/1/; TI 4
10
IBFIL
a/�1
\/BEDROCK /I/\\i \/I/\i/\/I/ \\��/I��� \-\'/-/\�\'/ GWA3aBRL-/\-\'/- \-\ Co 0.2Co
\
/1//\/\I/1♦/\/\I/1//\/\I/\\/\/\I/1//\/\I/1\/\/\I/1\/\I��'/\/\I/1\/\I/1\/\/\I/1\/\I/1\ Fe 3520
/�\/\/1/ //I �'/I/\\�i Fe sb7s /I \\�i�/I/\\'/ 1/\
/\�- \- \ /� _ \ - \ /`/ / \ l \ _ \ l /\/ / \ l \ _ \ l / / 1 / \ _ \ l / / \ l \ _ \ l / i \ l /\ _ \ \l i l \ / I / \ 1 / \I ♦ / / \I n 576 ♦ / / \I ♦ /_- ♦ /-
TI <a1 1 /
I/1�/\/\I/1\ /\/\I/1�/\/\I/1♦/\/\I/1�/\/\I/1\/ \/\I/1�/\/\I/1\/\/\I/1�/\/\I/1♦ / \/\I/1�/\/\I/1\/�\/\//1/ //I' \/� /\ / I/ \/� �� /I, \/i ♦ / I \/ �i � /I� \/� /\ / I/ \/_' � \ /I� \
/1,//\I/1\\/\I/1�//\I/\♦\/\I/1,//\I/1\\/\I/1///\I/1\\/\I/1//\I/1♦\/\I/1,//\I/1\\/\/1////I/\\�/\/I/\\�/\�/I/\\�/\\/I / mw-S1RRL
\� \�\'/\- �\ \�/\-- ��\'/\- �\ \'/\-- ��\�/\- �\ \'/\--\�i'/♦� /% lil\\/ I \ it/\/ /i lil\\/ I� \ it/\/ /% \/� /\♦/ I/ \ 1//\/\I/\\/\/\I/\,/\/\I/1\ / CO
F.
' \FRACTURES CONCEPTUALLY DEPICTED ON THIS CROSS SECTION REPRESENT GENERALIZED - \ /I / \ i - \ /I \ / ♦ / - \ /I / ♦ - \ /I \ / \ / / I / 1 ♦ / \ / /\ - \ \ / /\ - \ \ ' /\ - \ Mn
/ORIENTATIONS OF FRACTURES OBSERVED BASED ON TELEVIEWER LOGGING. THE DEPICTED FRACTURE
/ ORIENTATIONS ACCOUNT FOR APPARENT DIP WITHIN THE PLANE OF THE CROSS SECTION, AND - 1 ' / - \ \ / \ - \ ' / - \ - \ / \ - \ ' / - \ \ \ \ / - \ I / \ / I ♦ / - \ I / \ / / - \ I / ♦ / I \ /
\ VERTICAL EXAGGERATION. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO
/ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTHS AND LENGTHS OF FRACTURES VERSUS DEPTH �I j i / j \I / \ /_� �I j i / j \I/ 1 /_� �I j i i \; ��` 1 �\ /� / \\�\ \//I / \\ `�\ /�I / \\�\ �, `/i / \\ \ �\\//I / \\�\\\//I / \\ \ �\♦/� / \
/.-ARE CONCEPTUAL ONLY. - /. - - \ /.-_ \ _ /- - - 1 /.-_ \ _ /. - / ♦ / - - , . I ♦ /- _ - , . I _ \ / - _ - , . I _ \ / -
Ri�FR
R
UNITS I-4 `___ -,.
AS
f ASH
1 'CLIFFSIDA 1_STOR A
STEAM � _ `
1 STATION
UNIT
INACTIVE
ASH BASIN \`
1
CCP
LANDFILL
NOTE:
CROSS SECTION A -A' IS LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
LEGEND
GWA 25S WELL IN SHALLOW FLOW LAYER
GWA 25D WELL IN DEEP FLOW LAYER
GWA 21BR WELL IN BEDROCK FLOW LAYER
AB 6S WELL IN ASH PORE WATER
• — GENERALIZED WATER TABLE
�...� GENERALIZED BEDROCK FRACTURE
ORIENTATION
GENERALIZED GROUNDWATER
FLOW DIRECTION
0 ASH
ASH PORE WATER
® FILL
SAPROLITE
® TRANSITION ZONE
BEDROCK
ALLUVIUM
V
ASH PORE WATER ELEVATION
V
SHALLOW GROUNDWATER ELEVATION
V
DEEP GROUNDWATER ELEVATION
V
BEDROCK GROUNDWATER ELEVATION
GWAHiaBRL
Co al
MEAN COBALT (Co) CONCENTRATION (ug/L)
Fe s67s
MEAN IRON (Fe) CONCENTRATION (Ng/L)
Mn s76
MEAN MANGANESE (Mn) CONCENTRATION (ug/L)
TI <al
MEAN THALLIUM (TI) CONCENTRATION (ug/L)
WELL SCREEN
r
COMPLIANCE BOUNDARY
(' DUKE
ENERGY
CAROLINAS
synTena
NOTES:
800
750
700
00
co
1
650 0
'a
600 Z
O
Q
550 W
J
Lu
500
450
400
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
TO JUNE 2019.
2. COBALT (Co), IRON (Fe), MANGANESE (Mn), AND THALLIUM (11)
CONCENTRATIONS ARE IN MICROGRAMS PER LITER (Ng/L)
* WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
- NO DATA AVAILABLE
ANALYTICAL PARAMETER Co Fe Mn T1
REPORTING UNITS Pg/L Pg/L Pg/L Ng/L
,SA NCAC 02L STANDARD 1* 300 50 0.2*
BACKGROUND THRESHOLD VALUES
(SHALLOW FLOW ZONE), 21 1700 969 0.2
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE), s 1840 260 0.2
BACKGROUND THRESHOLD VALUES
(BEDROCK FLOW ZONE), 2 7680 113 0.2
* - IMAC OF THE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
1-UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
2010 TO DECEMBER 2010 AS SUBMITTED IN JUNE 2019.
0 100 200 400
HORIZONTAL SCALE: 1" = 400'
VERTICAL SCALE: 1" = 80'
5X VERTICAL EXAGGERATION
DRAWN BY: J. CHASTAIN DATE: 10/22/201
REVISED BY: D. KREFSKI DATE: 2/28/2020
CHECKED BY: T. GRANT DATE: 2/28/2020
APPROVED BY: S. SPINNER DATE: 2/28/2020
PROJECT MANAGER: S. SPINNER
www.synterracorp.com
FIGURE 6-8c
GENERAL CROSS SECTION A -A'
VARIABLE GROUP
MEAN OF COBALT, IRON, MANGANESE,
AND THALLIUM
ACTIVE ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
CLIFFSIDE STEAM STATION
MOORESBORO, NORTH CAROLINA
Rev. 1
23 April 2020

ApHiEFR .,—
,
..+-•�*"",� `
FORME
- ` UNITS 1-4 \ _
ASH BASIN
CLIFFSIDE\ Y ' SI OR\GE
STEAM �u ARI A
` STATION
' INACTIVE `.
/Ir
U
1 !� xx
ASH BASIN --
O
CCP
LANDFILL
NOTE:
CROSS SECTION J-Y IS LINEAR IN NATURE AND ALL
_ - - LOCATIONS NOT ALONG THE CROSS SECTION ARE
-- PROJECTED ONTO THE CROSS SECTION.
J -_
(SOUTH)
r
800 - 7
V
750
Do
a
z
Z 700
O
w
J
LU
ASH STORAGE AREA
■■MENEM
■■■■M.,
CLMW-■■
I..
00.Sr
��
fin►.
n■■.
f
,.0005'�!�■
II p
��■■illii
�■■Ilni�i■■
■
I;;
1
��
•
•
- iiji
7�I
'
� II
II'ij
!
o
/ \ / AS-M SAPROUTE
As 1 3.9
J'
(NORTH)
h
As0.5 ,.
- .-V--• - < 0.3 BROAD RIVER
0.3
0.5650-
AS-R7D
U (total)
/ sr 259
-
/
BEDROCKS — \ V <0.3
/
R ZOION
:A�
As 0.6
W0.0005
AS-MRB
/ \ /
As
1 1.6Sr 78
\ /
CROSS SECTION DOES NOT INCLUDE A BEDROCK
(total) 0.0040
600
EVALUAl1ON BORING WHERE OPTICAL TELEVIEWER DATA / 1
v
��
0.8
\
u (total) 0.0016
CAN BE USED TO DETERMINE GENERALIZED FRACTURE
BEDROCK/
ORIENTATION.
LEGEND
GWA 25S WELL IN SHALLOW LAYER
GWA-25D WELL IN DEEP LAYER
GWA 21BR WELL IN BEDROCK LAYER
AB 6S WELL IN ASH PORE WATER
GENERALIZED WATER TABLE
-� GENERALIZED GROUNDWATER
FLOW DIRECTION
ASH
ASH PORE WATER
® FILL
SAPROLITE
® TRANSITION ZONE
BEDROCK
ALLUVIUM
V
ASH PORE WATER ELEVATION
V
SHALLOW GROUNDWATER ELEVATION
V
DEEP GROUNDWATER ELEVATION
BEDROCK GROUNDWATER ELEVATION
As
�NOS
MEAN ARSENIC As CONCENTRATION L
( ) (ug/ )
sr
MEAN STRONTIUM (Sr) CONCENTRATION (Ng/L)
U (tota
MEAN TOTAL URANIUM (U) CONCENTRATION (ug/mL)
v
MEAN VANADIUM (V) CONCENTRATION (Ng/L)
WELL SCREEN
COMPLIANCE BOUNDARY
800
750
OP
0
a
z
700 Z
O
w
J
W
650
600 NOTES:
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
TO JUNE 2019.
2. ARSENIC (As), STRONTIUM (Sr), AND VANADIUM (V) CONCENTRATIONS ARE
IN MICROGRAMS PER LITER (pg/L). TOTAL URANIUM (U) CONCENTRATIONS ARE
IN MICROGRAMS PER MILLILITER (pg/mL).
* WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
- NO DATA AVAILABLE
ANALYTICAL PARAMETER As Sr U V
REPORTING UNITS pg/L pg/L pg/mL pg/L
15A NCAC 02L STANDARD 10 NE NE 3*
BACKGROUND THRESHOLD VALUES
(SHALLOW FLOW ZONE)1 0.2 34 0,0005 1
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)' 2 69 0.0005 11
BACKGROUND THRESHOLD VALUES
(BEDROCK FLOW ZONE)' 1 93 0.0005 1
* - IMAC OF THE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
1-UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
2010 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
CROSS SECTION LOCATION
Rev. 1
23 April 2020

eRpAOHi FR .,—
£ \ \ FORME
.n .i•�*"`.��► _ = ` UNITS 1-4
I ` •� ASH BASIN
CSTEAM B\\ �u '"SIOR ARIA E,
STATION ACTIVE
Qom. UNIT ` �� ASH BASININACTJ
r�
ASH BAISIN ' -;
"i CCP 41
LANDFILL OCRgW _
R04
NOTE:
CROSS SECTION J-J' IS LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
J-
(SOUTH)
800
750
0
Q
z
z 700
O
H
Q
w
J
W
650
600
n
ASH STORAGE AREA
LEGEND
GWA 25S WELL IN SHALLOW LAYER
V
ASH PORE WATER ELEVATION
GWA-25D WELL IN DEEP LAYER
GWA 21BR WELL IN BEDROCK LAYER
_y
SHALLOW GROUNDWATER ELEVATION
AB 6S WELL IN ASH PORE WATER
DEEP GROUNDWATER ELEVATION
GENERALIZED WATER TABLE
BEDROCK GROUNDWATER ELEVATION
GENERALIZED GROUNDWATER
-ot. FLOW DIRECTION
MEAN COBALT (Co) CONCENTRATION (pg/L)
MEAN IRON (Fe) CONCENTRATION (pg/L)
© ASH
Fe
MTI�
MEAN MANGANESE (Mn) CONCENTRATION (pg/L)
ASH PORE WATER
MEAN THALLIUM (TI) CONCENTRATION (pg/L)
® FILL
WELL SCREEN
SAPROLITE
® TRANSITION ZONE
COMPLIANCE BOUNDARY
ca: BEDROCK
r
0 ALLUVIUM
I
J'
(NORTH)
800
750
700
650
600
G
0
Q
z
z
O
H
Q
w
J
W
NOTES:
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
TO JUNE 2019.
2. COBALT (Co), IRON (Fe), MANGANESE (Mn), AND THALLIUM (TI)
CONCENTRATIONS ARE IN MICROGRAMS PER LITER (pg/L)
* WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
- NO DATA AVAILABLE
ANALYTICAL PARAMETER Co Fe Mn TI
REPORTING UNITS pg/L pg/L pg/L pg/L
15A NCAC 02L STANDARD 1* 300 50 0.2*
BACKGROUND THRESHOLD VALUES 21 1700 969 0.2
(SHALLOW FLOW ZONE)1
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)' S 1840 260 0.2
BACKGROUND THRESHOLD VALUES
(BEDROCK FLOW ZONEV 2 7680 113 0.2
* - IMAC OF THE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
1 - UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
2010 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
CROSS SECTION LOCATION
Rev. 1
23 April 2020

800
750
650
600
500
450
400
K =
(WEST)
GWaM J
B <w II p m
Li 19
TDa 2a] GWA-585 N N M Q
50
GWA_SJgy \ Li 2.2 In m Q Q a
i —__ —__
m m m m M---------- -----------------
W y------------ ----------------
ros N C7
n n n ao 0 o t9
0 u _
MM M M M N a p_----------------------------------------.
ACTIVE ASH BASIN
Q GROUNDWATER FLOW IS PERPENDICULAR
CROSS SECTION IN THIS AREA
m — y N 1--c
�ic
000 mm00 mQ Q¢ Q
7
Ipbp FILL
----------------------
I__________ ________ __.
Q-- -- -----_-_-='ASH ---_ = ASH --- —
_ _____-------- __ FILL -. __ __--- _--
------------- _______________
--==-vv--_ ____
___ A8-035 _ _ _-________________________________________
_______________ B z9Ja - - ___---_---_---====-ASH PORE WATER-====__--_
AB-085 _-_-_-_-_- _ __ ___ _ _ _ _ _ _ _ _ _ _ _ __________ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ________
-------------- ---
B a36o -----
- -_ _ _ _ _ _ _ _
-
-
---------- - 2913
A"-0 - Li 141
_ so4
126 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ GWA-29D
119 --- - TDs 470----------------------- B <50
----------- ASH PORE WATER
----- -- --- - ----
KI
(EAST)
----------------- - ASH- PORE WATER -------- - ros 16os -_- - - - - - - - - - - - - - - - - - - - _= -- ------------ -__
--- P RE WA ER
ros 3n B 311 _ TRANSITION• /
--- - ---- --
sucK U'--------------------------- - - -_--- a sas - ae-oauLss
-----------------------_-_---
CREEK
__________________
ZONE
___-- i GWA-ZOS SO4 31.1 / 1 / \ /
--- __-- -� - B 283 ___________ A&a35L TDS 172 Li 145 _____________/ /
SAPROLITE soa 1.a --
B <50 So4 92.4 A8-09D<60 TDS J6.8 -------- _ __-_ _ _ / \ GWA-240R
Li 62 NA TDS 349 TDS 124 AB-0BI SAPROLITE 504 6s.7 Li 1.9 _--- \ B <so
/ \/ / Li L8 �
97 Toy 191 Soo _ / \
\ \ TRANSITION ZONE a
TRANSITION
BBa —ZONE
/] u 1a.a / \ /I \ I \l / //\ /�♦ \ \ /\ ` .I /// \ \/ I — Al
49.] If
a9 - — M9 GWA-58BRU � / / _
]06 StX 44.q Li 5.0 /
♦ 60-.0 / I \ /I I / /\I ♦I Li ABa4M
916 GWA-20BR i580 / % \ I GWM43D� \ / \ "'IF-
1 504 ♦♦\ ABO336 / \ ♦ 1 / 13
82.4 TBEDROCK
BEDROCK
,
\ / \
/ / aToDBa e2a539 -/ I \♦♦ \ \ /� �y \ / 8.-0 / _ /\I / \\/ / I—/ �\ \ /\ / / \ \\ / I —, •\,t \ / / \ �1 / / I—/ \ \ /\ /
AB-01 .y \ BEDROCK\
B 380 B 47G I—
GWA-H
/
GWA-MM u - u 1.a I I �\ / i 1 \ / ♦ I 1 \ % — I \ / I \ / — I \ / ��'• I I . \ / — I \ / Y / ��
B 160 GWA- 57RR 1 _ /♦ I \ / \
B 231 \ / B 366 ��� soa SO4 53.3 \ �•\ / 1 I \ / \ / I \ I \ \ I / 1 \ 1 \ ,FRACTURES CONCEPTUALLY DEPICTED ON THIS CROSS SECTION REPRESENT GENERALIZED
Li 111 % /- Li 11.0 ros ros z9z h I/ t / I / / ♦ / / �/ / / / \ / / ORIENTATIONS OF FRACTURES OBSERVED BASED ON TELEVIEWER LOGGING. THE DEPICTED FRACTURE
5O9 79 ♦♦ { soa lza \ — � / I / 1 \ / „ \ I / ORIENTATIONS ACCOUNT FOR APPARENT DIP WITHIN THE PLANE OF THE CROSS SECTION, AND
28z / 1 - Tos M4 I*� TDs 3az �l / / II / \ / / I /I� / / \ 1/ I / / / B eaa6 / / \ / I / \ I/ / / / I / / ,/ I / \ / / \ VERTICAL EXAGGERATION. THE ACTUAL NUMBER OF FRACTURES IS FAR T00 NUMEROUS TO
_ / II \ it /\ `_ i I •\ /i\ / — l /
// ♦ \ - \ / — - \ \ \ r _ \ ♦ \ \ \ \ / I _ \ \ 'ILLUSTRATE ATTHIS SCALE. IN ADDITION, THE DEPTHSAND LENGTHS OF FRACTURES VERSUS DEPTH
/ \ X - I \ I \ / I I \ / - I soa / \ I \ / I \ I \ / I ARE CONCEPTUAL ONLY.
/� /� T05
\ LEGEND
'M \ / \ / — \ / ♦� \ / \ I �� GWA66BRL / WELL IN SHALLOW LAYER © ASH
♦ , I �j I , /'1' / \ B 403 \I GWA 58S ASH PORE WATER ELEVATION
F_ 800
750
700 Z
650
600
Q
LL
J
W
TM Z \ /I j / GWA 58D WELL IN BEDROCK LAYER SHALLOW GROUNDWATER ELEVATION WELL IN DEEP LAYER ASH PORE WATER NOTES:
/ \ / \ FILL 1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
4 I / \ / / \ __.� / 1\ / _ _ _ \ GWA-58BR ® CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
WELL IN ASH PORE WATER TO JUNE 2019.
0 SAPROLITE DEEP GROUNDWATER ELEVATION
GENERALIZED WATER TABLE ® TRANSITION ZONE BEDROCK GROUNDWATER ELEVATION L2. ITER BORON ALB) AND LITHIUM (Li) CONCENTRATIONS ARE IN MICROGRAMS PER
�, l \ �` i I i� 3. SULFATE(SO4)AND TOTAL DISSOLVED SOLIDS TIES CONCENTRATIONS
♦,\, \ /\ \ / I \ \ ORIENTATION BEDROCK FRACTURE -I_ BEDROCK AB-04BR MEAN BORON (B) CONCENTRATION (ug/L) ARE IN MILLIGRAMS PER LITER (mg/L) (TIES)
GENERALIZED GROUNDWATER B 550 MEAN LITHIUM (Li) CONCENTRATION (pg/L)
FLOW DIRECTION so4 3.6 MEAN SULFATE (SO4) CONCENTRATION (mg/L) WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
\ / \ MOST RECENT VALID SAMPLE DATA UP TO DUNE 2019 WAS USED.
T05 u° MEAN TOTAL DISSOLVED SOLIDS (TDS)
/ 1-_BRogo CONCENTRATION (mg/L) No DATA AVAILABLE
/ I \ 7 \ / _ \ / \ / — RR. ANALYTICAL PARAMETER B Li SO4 TDS
- I \ / I / I \ _ ^ WELL SCREEN REPORTING UNITS pg/L pg/L mg/L mg/L
\ / / \ / \ \ / /\ �i♦\ / — \ _ \ ���/ — / \ % \ L 15A NCAC 02L STANDARD 700 NE 250 500
\ / \ \ \ -♦♦` \ / / i / \ \ \ /-- FORMER COMPLIANCE BOUNDARY BACKGROUND THRESHOLD VALUES 50 3 4 57
71 UNITS 1-4 (SHALLOW FLOW ZONE) ASH BASIN ^ BACKGROUND THRESHOLD VALUES
NA NOT AVAILABLE OR NOT MEASURED 50 12 15 107
N / — / I \ / — ` ASH (TRANSITION FLOW ZONE)
_ \ \ / _ \ / / \ I \ / / 1 CLIFFSIDE r. STORAGE
STEAM n ' AREA BACKGROUND THRESHOLD VALUES
STATION �o�l.- ;' . , ACTIVE ---�- BREAKLINE (BEDROCK FLOW ZONQ) 50 11 17 120
UNIT r ASH BAST" 1
_ � -UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
ASH IN / �`O - DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
_ \ \ / \ / \ / — - \ 2010 TO DECEMBER 2018 AS SUBMITTED IN TUNE 2019.
I \ \ / i •`,� /`�\ \ / / �Gk A ` \�. \ .' NE - NOT ESTABLISHED
350
CCP Mc O BO 120 240 FIGURE 6-10a
LANDFILL CRgw DUKE
\— \ \\— / \ ROgo` �' HORIZONTAL SCALE:1°=240 GENERAL CROSS SECTION K-
\ ENERGY VERTICAL SCALE:I"=48' CONSERVATIVE GROUP
5X VERTICAL EXAGGERATION
_ CAROLINAS DRAWN BY:J.CHASTAIN DATE:10/22/2019 MEAN OF BORON, LITHIUM, SULFATE A
\ GWA-08RL / \ I \ / \ SECTION K-WIS LINEAR IN NATURE AND ALL REVISED BY: D.KREFSKI DATE:3/2/2020 DISSOLVED SOLIDS (TDS)
300
/ I \ - LOCATIONS NOT ALONG THE CROSS SECTION ARE * CHECKED BY: T. GRANT DATE: 3/2/2020 ACTIVE ASH BASIN
/ \ I / 1 \ I \_ PROJECTED ONTO THE CROSS SECTION. APPROVED BY: S. SPINNER DATE: 3/2/2020
CORRECTIVE ACTION PLAN UPD
_ _ \ / _ PROJECT MANAGER: S. SPINNER
T� CROSS SECTION LOCATION �mTPra CLIFFSIDE STEAM STATION
Rev. 1
23 April 2020

K - - KI
(WEST) ACTIVE ASH BASIN _i (EAST)
Q GROUNDWATER FLOW IS PERPENDICULAR T
p CROSS SECTION IN THIS AREA p W
GWA-57s
8OO Ao m m 0] m 0] m Q
p m aQQQQ �+C7C7
Sr 132 �. ________- _ _________ FILL 1fi N
GWA _
U (total) 0.00035 ___ QQ
v 0 AS 0.13_-_-_-_-_----------- ------------------- p (/� m y J
Sr 175 m FILL mm�m__ -_____:- _ _ ________
Gwa757Blu u(rota0 <o.000s N a a Q U' --- - _ _---==ASH_====_____- m m A
AS 1.3 V 0.30--------------------- - - - - -------------------- ----- __
_________ ___ ________________________FILL-: ___ _____________Ix
__________ Q Q Q Q a a s
_____________ _________________________
Sr 293 "_____________ ____- __ ___________________________ �� U(tc
A8-WIlA15
U (total) 000e35________________________________ -_ -- - --------------_____________- _ AS 92.3--_------------- --_- V
o ------------------------ _ -- --� --_--- - --------------------------------__=====-=====----
um - SAPROLITE
V o.91 r r r oo0oao p o r t9 = _�_=-_�-ASH_=-�=__ �_ =---- _ -__--_---_-_-�__-�__-�__-�__-�__-�__-�__-�__-�__-�___-_�_- - __
NNY�7�NN oNQ __________________�.r_ ______-----___________ _ _ _ __________________
N -__-__-'_-_____ _--_-___-______- s 37z _ ___---___-�_=-�==ASH PORE WATERv9 GWA-24D
750N C m y O QQ a aQ Q r Q3 ___-_---____-------------------- - S 3Go7 -- =-----=-=----=-=-=-_-�__-�_=-=-=-==-=--- 92.6 -------=-==-=-==-=-==-=-==-=-==-== A5 <G.1 --
A&085 �• - _ _ mod`"_______________________ ____
M M M M M �� w a�0 FILL #=-- _---_- __ As Gs.i--____ugarap o.00n - __ Aa-o3rAass--____--___--___ --- ----_- Sr_--__---- ------------------_-__= sr z3.G
jM jM jM j� C7 C7 �U'______________________________ _ v s.1 = - ___-- As zsz---___-_ _ -- -- ugara0 000G6 -=-===-=== ASH PORE WATER
__2�n5 -------_-_------
�' _ _ _ _ - ASH PORE WATER -- - - - - u (vta0 asZ ss ,I�a3u _ _ - u (taraD oaoa3 ,�e.amass v < 3 i
_ U' C9 0 C7 U' ARass------------------------- - As 851 v 109 aR-aril _ As 184 __ TRANSITION• /
SUCK (� ns _ _
00 CREEK o.7a _-_-_-_-__ sw As lfi9z - __ __-_\ ZONE
00GW-----
-335 AsGWA-TG0SAPROLITE U(tvota_1)
\ /
\ GWA-
0 -lie AS 2a61
R0.1
> 29.2Q I
1
Z s 14z v 0s SAPROLITE
u Rarap 0.0a0m \ as-ael �,
Z 700 v \ TRANSITION ZONE As 3.1 AS 31
I \ ns aaa _ \ ♦� ?
\\ / j / , 1 / \ i j _ u (rotap olooaa u (tota0 Sr 131 --�- \ TRANSITION
\ a - NA / D (total)
/ \ % \ - \ \ � � / <as w�°eaRosz � � z.a 1 ; / \ � ZONE � / v <as i / \ / - � � / � ♦ \ / \ � -
LU �GwAaw a AswA a3s ♦ \ / I I \ v _ \ / I / s vz \ / I / \ I \ / / \ / / \ / /`.• \ I - \ / / \ / I \ / / \ ♦T - \ / / \• �♦ I / \ ` / \
J 0.0006 - \ / A..A / �- e / \ / / �- _ \ / \ ♦/ / • \ / \ �/
W Sr 169 sr lei ewa-a3o • ,� _ \ I♦\ j - I u (total) oaoss \ \ - As _ - \ \ - I \ / - \ '( I I♦ \ / - \ \ • I j
\ V <0.3 GWA-208R , \ \ /
u RaraO - u(tota0 - 0.3a GWA-zao As o.fi7 / II / \ I ♦ / / \ / / I\ I / '-� - / \ i• / \ / \ / 1 •d / \ / \ ♦/ 1 / \! / •\ / \ / •1
V 0.4 v I s 1 \ / 1 \ / 1 \_ \ \ • / \ \ ti As <0.1 1 \_ \ \ / 1 \•
1fis / / ns 0.z3 sr sza I / / ♦I aB-GSBR - • I / u (mta0 - / I / _ / - / ,
_ \ / total) - sr sag - u (totap omoz \ - 1 /♦ ns o.a2 / I \ - \ j / - \ \ - �- \ I/ - \ 1 ,/ \ Jos\BEDROCK
o.m / u [totap <0.000s v <0s k BEDROCK _ ♦ \ sr 1Ga \ / _ \ • _ \ / \ / (totap <0.ao0s \ \ /
650 \ / \ \ v 0s ♦ \ u (mtap a.00la �t \ - ` v <os - /
/� \ • BEDROCK\ - - / \ I \ • - / \ I - \
6WA-57SR \. AS <0.1 \ , . I / .- 1 \ , ♦ I • \ y I \ , I \ / I . , �._. I \ / \ 1 . , y • I
GWA-33R u(totap - /� I • ♦/ \ / \, / y /• \ / 1 /♦\ \ / \ / , \ / \ FRACTURES CONCEPTUALLY DEPICTED ON THIS CROSS SECTION REPRESENT GENERALIZED
I: 0.1 \ / Sr 241 ,.�- \ .� / 1 , \ \ I` / 1 \ • / \ \ . / 1 \ 1 / \
� 2na 1 / , sr 199 _ _ \ u (tara0 o.aooa - / - \ / \ V �0•� A, ,/ ♦♦. 1 / / \ - / \ J� / _ / ` / / _ I / / / / / ORIENTATIONS OF FRACTURES OBSERVED BASED ON TELEVIEWER LOGGING. THE DEPICTED FRACTURE
♦ (totap 00009 V - \ }1 ♦ \ \ \ / - \ \ ,� \ I - \ \ / ORIENTATIONS ACCOUNT FORAPPARENT DIPWITHINTHE PLANE OF THE CROSS SECTION, AND
u(totao `�� V { / / / ♦ / •/ / / aRmRR / / / / • / ♦/ / / / \VERTICAL EXAGGERATION. THE ACTUAL NUMBER OF FRACTURES IS FART00 NUMEROUS TO
/ / / _ / \ ♦% - / • ♦ _ / / - / sr \ / \ / - / • /♦ \ / - / ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTHS AND LENGTHS OF FRACTURES VERSUS DEPTH
ARE CONCEPTUAL ONLY.
600
LEGEND
/ \ \/ I / \ / % - \ \ / \ \ / -• \ GWA 58S WELL IN SHALLOW LAYER - - - - ASH ASH PORE WATER ELEVATION
/��I`� / / ♦ \ Sr 39s \ _ / GWA 58D WELL IN DEEP LAYER ASH PORE WATER
500 \ / /� / \� \ / /1 - / /; - - ,•\ u (total) o.oao1 \ 1 / GWA 586R WELL IN BEDROCK LAYER SHALLOW GROUNDWATER ELEVATION
800
750
700 Z
650
600
1 / / \ •- \ / \ / / \• / I �/ \ / V 0.3 / \ / / 0 ® FILL NOTES:
I / \ / / / �\ / \ / \ / _ \ AB_8 WELL IN ASH PORE WATER 1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
/ - / I• \ / - © SAPROLITE DEEP GROUNDWATER ELEVATION
\ \ / \ _ \ I / \ / \ / 1 \ / \ I � 1 \ / \ / . CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM ]AN UARV 2018
/ \ I �.� \ / \ \_ / •� \_ GENERALIZED WATER TABLE ® TRANSITION ZONE TO JUNE 2019,
\ ♦ / 1./ 1 \♦ / �'� \ \ / \ \ BEDROCK GROUNDWATER ELEVATION 2. ARSENIC (As), STRONTIUM (Sr), AND VANADIUM (V) CONCENTRATIONS ARE
♦/ - - \ / �♦ \ / ` _ 1 IN MICROGRAMS PER LITER (pg/L). TOTAL URANIUM (U) CONCENTRATIONS ARE
/ \ - / _ GENERALIZED BEDROCK FRACTURE -1- „I; BEDROCK IN MICROGRAMS PER MILLILITER (Ng/m L).
�♦ \ \ /�� / ♦y / \ / I /`� / / / \ / ORIENTATION
GENERALIZED GROUNDWATER As B-046R 0.1 MEAN ARSENIC (As) CONCENTRATION (pg/L) ' WELLS WITH DATAS ETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
450 \ / \ / - _ \ / I \ / - ' I \ / �� MEAN STRONTIUM (Sr) CONCENTRATION (pg/L) MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
\ / \ / 1 / \ / FLOW DIRECTION Sr 105 - NO DATA AVAILABLE
\/ \ / I / \7,
350
300
I
CROSS SECTION LOCATION
u (total) <o.000s MEAN TOTAL URANIUM (U) CONCENTRATION (pg/mL)
V <0.3 MEAN VANADIUM (V) CONCENTRATION (pg/L)
WELL SCREEN
COMPLIANCE BOUNDARY
BREAKLINE
NOT AVAILABLE OR NOT MEASURED
4' DUKE
ENERGY
CAROLINAS
111611111,
synTero
0 60 120 240
HORIZONTAL SCALE: 1" = 240'
VERTICAL SCALE: 1" = 48'
5X VERTICAL EXAGGERATION
DRAWN BY: J. CHASTAIN DATE: 10/22/2011
REVISED BY: D. KREFSKI DATE: 3/24/2020
CHECKED BY: T. HARTMAN DATE: 3/31/2020
APPROVED BY: T. GRANT DATE: 3/32/2020
PROJECT MANAGER: S. SPINNER
www.synterracorp.com
ANALYTICAL PARAMETER AS Sr U V
REPORTING UNITS pg/L pg/L Ng/mL pg/L
1SA NCAC 02L STANDARD 10 NE NE 3-
BACKGROUND THRESHOLD VALUES
(SHALLOW FLOW ZONE)1 0.2 34 0.000S 1
BACKGROUND THRESHOLD VALUES
(TRANSITION ROW ZONE)1 2 69 0.000S 11
BACKGROUND THRESHOLD VALUES
(BEDROCK FLOW ZONE)t 1 93 0.000S 1
^ - FEDERAL MAXIMUM CONTAMINANT LEVEL.
"- IMAC OF THE SSA NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013,
1-UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
2010 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
FIGURE 6-10b
GENERAL CROSS SECTION K-K'
NON -CONSERVATIVE GROUP
MEAN OF ARSENIC, STRONTIUM, TOTAL URANIUM
AND VANADIUM
ACTIVE ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
CLIFFSIDE STEAM STATION
MOORESBORO, NORTH CAROLINA
O
F-
LU
J
W
Rev. 1
23 April 2020

K— sm—sm KI
(WEST) ACTIVE ASH BASIN _i (EAST)
Q GROUNDWATER FLOW IS PERPENDICULAR TO
CROSS SECTION IN THIS AREA N
800
Ca 14.5 O m
Fe 246 O: tD ___ FILL N N (7 GY
Mn >ess �AB�la.v J N N N Q CF.
O oQ OQ 00 ____ ___ ___ _ _ ____________
Fe L56 m m m m HILL m m�m _____________ _______. _ _ _ ________ Mn
Mal
Mn 1am N -=__=_____==ASH==_ ASH=====_ rl
________________________________________________a36 :� ______ - _____________FILL-: _- __________________ __________________________co ____. __ ___________________________ AB-045 ���GWA-____ _ ____________________ AB-0MIALS�v___0 9 _________=___ _____-�____- ____-____________________ AB-D3s ___________________________ -_- m o.11 _ _co <oa---------------=SAPROLITEFe
nmm 00O QO=V 5� --_ASH_—_-- _—�----------------------------- 1.0 _ _________________________________________ Fe <50 - - Fe <50 Mn
Pe Mn <s
Q a a a Q Q N Q�__-�__-�_ �y ___-__-- --_ --_ ---_-_ - - - -- -----------==-=-ASH PORE WATER =__- rl <0.1 --_- - n <0.1-___-___-___-___-___-_- TI
750 w c m In o Q _____ -- -------------------- Aeass M" 1165 = -_--_ _------=--------------�___---- --- _ --__ __ __=-==-=-==-=-==-�__-�__ --------
co
_2=______________________------------------------- --- --- --- ---
FILL - ---- - --- --- --- --- -
M M M Y C7 C7� Oyi �(9=-------------------------- - uo --- TI o.6a -_ - ---- aAnoa---____-_ _ -- ----- ---- -- - -__ -_-- ASH PORE WATER
Q Q Q Q Q Q U' - --- -- --- -- --- --------------
ASH ---M n -- - - � - - - - - - - --- - - - - - - - - -
3 =-_-_- PORE =-_- -- rl oss _ ___ <s - ABonAss_________________ \TRANSITION
Z-_ _ _ _ _ _ Fe 97.1-_-_-_- - C'u 5.4 _-_-_- -_- - \ GWA-246
SUCK AB-025 __ ___ ___________ ____ _ a179 - _ TI <a.l Mn 9.1 Fe 41a8-___________ co 0
CREEK ______________________ _ _ rl _ \ ZONE
F.
00 GWA-21K ca 39.2___________________ _ M" <a1 <o.l T� p�7-----__-__-_-__-_-/ / / 1 / \ \ /`/ / Mn s
i
Gwa- ---- - -- - Co 13.3 Fe sloz =- _ _- TI SAPROLITE _--_-_-_-_-- _-_ -_ \ — 1 --
Mn 1]59s -- C.X�6
\ TI
> 146 Fe 966
a Fe �� NA Mn W13 TI osa AB I SAPROLITE _ __
Z 700 Mn 546 <0.1 CO 11.8 GWA-5M / — - _ _ _ _ \ \ / \ / — -I \♦� : /
TI <al \ \ TRANSITION ZONE Fe zazso 42 +
\ \ / \ / ��♦ \ \ \ ` i AB-DZD n o.osz Fe ao.o �qj/ 1 \ / \ / \ /
co
jIn
- \ I �♦ \ Co 11.7 NA, 1 / \ Fe ma6 / /
�1
UJ Fe \ • I Fe 31aa / TI \ / I / \ / / \ \ / I / \ I \ / / \ / �► / \ / /`.• \ I \ / / \ / I \ / / \ of \ / / \• /� I / \ / \
J Mn 89 // m.- ,,.625 Mn ]2a / / _ / \ Fe 13S! / — ABQSBIIUA / ♦♦- e / \ / — / �- \ / \ I/ — /• , — \ / \ 1/
/ — /� / _All
w TI of M� <50 \ / \ ca 100 /�1 ! / \I ♦�\ /i\ / \I / a.1 /I\I \ / \I \ /1 /•�I \I ♦ \ / — ! \ /i / \I I
GWA-65 I / TI <al / \ Fe 1664 I / \ 1 / / • I / 1 \ / \ \ / AB-04BR 1 / \ \ / 1 / \ \ / i / 1 / \• \ / ; 1
- L3 / — — 0.1
F. V4, y 1 / Mn WIS / I / — • I' — / Mn — \BEDROCK / \ \ 1
\ _ rl a.71. �t BEDROCK ♦ \ _ • \ • _ \ / 1sa7 \ \ / _ \ \
Mn 13 ..� . � AB-0BB0. 1
r / ♦ P. \ / \155 \ / \ I /
TI <al / ��_ / I _- - •/� I / . / I \ / I / \ / 1.3 / \•�/ I / \ /• \I I �•� / \ / • \ I / \
i� / GwA-zaeR — ♦ \ / — \ 1 — / Fe zags \ / I / BEDROCK\ •/ \ / — TI o.l — ♦ / y / — \ / — I~� / \ /
♦ Gwa.SZBR ♦ Fe a.25 / \ i \ / — \ \ \ / — _ \• I \ \ / — \ / ♦� \ I \ \ /
GWA-33m as / \ - Fe a625 \ / — /f I \ / ♦ I Mn SA 1 1 \ / ♦ I I \ f' — I \ / I \ / — I \ / ♦y I ■ . \ / — I \ / y / 't♦. I . ,
<al n aas gyp.' AB-02BR0 / 1 / \ \ /♦♦r\ / \ \ \, �/ \ TI <o. I\ / / 1 \ \ / 1 \ \ /��\ / \ \ / \ / lI \ \ / \ FRACTURES CONCEPTUALLY DEPICTED ON THIS CROSS SECTION REPRESENT GENERALIZED
Fe 13os ♦ 7 M" e5s — Co 12352 \ --I• \ �� / It \ / 1 / — ♦\ / / \ — \ / / \T1 ORIENTATIONS OF FRACTURES OBSERVED BASED ON TELEVIEWER LOGGING. THE DEPICTED FRACTURE
Mn, ♦ TI <al i AB-a36RA / \ \ • / ORIENTATIONS ACCOUNT FOR APPARENT DIP WITHIN THE PLANE OF THE CROSS SECTION, AND
♦ \ *,f GWA-586R Mn 218e / / •/ / / / / /
rl <al \ I cn o.31 \ / / \ / • I /� \ / / \ • I / / \ c° - \ I \ `I/ \ / I / I\ / / y I \ / / \ VERTICAL EXAGGERATION. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUSTO
Fe ls3sa \ / / \ \ / \ r — \ / j / \ / Fe ILLUSTRATE AT THIS SCALE. IN ADDITION,THE DEPTHSAND LENGTHSOF FRACTURESVERSUS DEPTH
Mn lo3a \ / \ I \ / — I \ / / \ I • \ / \ / \ I Mn ARE CONCEPTUAL ONLY.
TI 01
Soo A_ LEGEND
/ WELL IN SHALLOW LAYER ASH ASH PORE WATER ELEVATION
"♦ \ /\ \ / I / \ \ \ �\ — � \ I \ / \ ./i \ \ B:1s I /\ �/ GWA-58S 0
— �♦�I:♦ WELL IN DEEP LAYER ASH PORE WATER
500 \ / 1 / \ • / \ — / \— — •\ Mn z63 \ —I \ SHALLOW GROUNDWATER ELEVATION
450
400
350
300
800
00
0
Q
Z
700 Z
O
Q
W
J
Lu
650
600
�— \ i \ / / / / Al / I I/ \ TI D.1 ' / / / / GWA 586R WELL IN BEDROCK LAYER ® FILL 1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
1 r / / / l \...r / I\ / — l — \ \ WELL IN ASH PORE WATER CENTRALTENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
'C \ I — \ — \ / /'— / \ I� \ / — \ I \ / \ / — / AB 8 SAPROLITE DEEP GROUNDWATER ELEVATION TO JUNE 2019.
\ / \; / 1 % \ / % I \ \ \; / •� \ \ / A ��� 1 / \ \ / — V GENERALIZED WATER TABLE ® TRANSITION ZONE 2 COBALT CONCENTRATIONS ARIRONE IN MICROGRAMS MANGANESE
(Mn),PEANDTHALLIUM(u LL UM (TI)
BEDROCK GROUNDWATER ELEVATION
GENERALIZED BEDROCK FRACTURE % • ,; ; BEDROCK
,� \ \ ♦� l► / \ / I �♦♦ / / / \ / ORIENTATION WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
GENERALIZED GROUNDWATER �AB-04BX01 MEAN COBALT (Co) CONCENTRATION (ug/L) MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
/ \ / FLOW DIRECTION MEAN IRON (Fe) CONCENTRATION (ug/L)
Fe 18a7 NO DATA AVAILABLE
MEAN MANGANESE M CONCENTRATION L
1,7
q
\ /
/ I
\ / \ / \I\\ // I♦��� / \ \
♦\/�I
\
_
_
[n
Fe
MnTI
CROSS SECTION LOCATION
NA]
4' DUKE
ENERGY
CAROLINAS
111611111,
synTero
( H) W )
ANALYTICAL PARAMETER Co Fe Mn
TI
MEAN THALLIUM (TI) CONCENTRATION (pg/L)
REPORTING UNITS Ng/L Ng/L u9/L
Ng/L
15A NCAC 02L STANDARD 1* 300 50
0.2*
WELL SCREEN
BACKGROUND THRESHOLD VALUES
21 1700 969
(SHALLOW FLOW ZONE)1
0.2
COMPLIANCE BOUNDARY
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)' S 1840 260
0.2
BREAKLINE
BACKGROUND THRESHOLD VALUES 2 7680 113
0.2
(BEDROCK FLOW ZONE)'
NOT AVAILABLE FOR WELL
* - IMAC OF THE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
1 - UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
2010 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
0 60 120 240
HORIZONTAL SCALE: 1" = 240'
VERTICAL SCALE: 1" = 48'
5X VERTICAL EXAGGERATION
DRAWN BY: J. CHASTAIN DATE: 10/22/20
REVISED BY: D. KREFSKI DATE: 3/2/2020
CHECKED BY: T. GRANT DATE: 3/2/2020
APPROVED BY: S. SPINNER DATE: 3/2/2020
PROJECT MANAGER: S. SPINNER
www.synterracorp.com
FIGURE 6-10c
GENERAL CROSS SECTION K-K'
VARIABLE GROUP
MEAN OF COBALT, IRON, MANGANESE
AND THALLIUM
ACTIVE ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
CLIFFSIDE STEAM STATION
MOORESBORO, NORTH CAROLINA
Rev. 1
23 April 2020

850 N - N-.0111111
mo
N N ACTIVE ASH BASIN
as
m N �
N N N
� L)
POSSIBLE RADIAL GROUNDWATER FLOW
800 IN THIS AREA
SAP OLITE
co � N N
w IM m m SAPROLITE
ASH a iA. Q GwA-z2s
/ \ / / TRANSITION ZONE -----___-__---_- ____ _----------------- __-_-_-_-_-_-_--- -_ __________-_ ' ' uR�t�l)
0.1
\ 10
LLJJ AGWA 27DA lam- --�-�- ACca-isoo.l - - - - - - - - - - - - --A8-065 = - — - - - - - - - - - -___ _-_-_-_-_-_-_-_-_- v os
Sr 107 / \ Sr 10 __ _ As 323_____________________________________ !
Q750U U([arap <0.0005 / / 1 / \ \ / \Oct (total) - \— Sr 2511---------------------_________ - Sr 35aU \ /
> U / \ / \ v <0.3 \ \ (tarap o.0010 ------------------- ------ u(tota0 o.ue7 -_--- As <0.1 /
V < a.3
v . —9- _ ASH PORE 1.6 _
— _ - - - —_ _- _- _ - -_- _ _ ___-_-_---_-_-- u (e tap za
WATER / � / / \
Z --------------- --_-_ _
/TRANSITION / \ / \ u(a<zs
ZONE 1 \\ / V )
o.3
Rrf
> — \ / / — \ \ / \ — — \ / —
w / I / // \ / ► / \// / \ / I / \// \ S 3'8
J / — / GWA-278R / \ / — / _ / as o / \ I \ / — / / u (total)
W 700 \ / — \ \ As 0.3 \ I \ / — \ \ / \ / — \ I u (total) <o.000s \ / I \ / \ — \ I \ / \ / — \ i ��
Sr 206 / \ / \ V <0.3 1
/ U (totap 0.0019
v <0.3 BEDROCK'
TSr23
zYll /\ \ / ISr 101//\ u (tarap <o.000s \
650 /\BEDROCK \ �'3\—
/
BEDROCK
NOTES:
CROSS SECTION DOES NOT INCLUDE A BEDROCK , I / \ / / \ / I / / \ / I / \ / / \ / I / \ \ / \ / I / \ / / ' 1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
EVALUATION BORING WHERE OPTICAL TELEVIEWER DATA CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
CAN BE USED TO DETERMINE GENERALIZED FRACTURE \ \ / — \ \ \ / — \ \ TO JUNE 2019.
ORIENTATION. \ \ I \ / \ 2. ARSENIC (As), STRONTIUM (Sr), AND VANADIUM (V) CONCENTRATIONS ARE
6OO IN MICROGRAMS PER LITER (pg/L). TOTAL URANIUM (U) CONCENTRATIONS ARE
IN MICROGRAMS PER MILLILITER (pg/mL).
I _ - LEGEND * WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
. MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
�
slo - NO DATA AVAILABLE ; gDRirFR ,. GWA-25S WELL IN SHALLOW LAYER � ASH PORE WATER ELEVATION
GWA 25D WELL IN DEEP LAYER ANALYTICAL PARAMETER As Sr U V
GWA 21BR WELL IN BEDROCK LAYER V SHALLOW GROUNDWATER ELEVATION REPORTING UNITS
p9/L P9/L P9/mL p9/L
15A NCAC 02L STANDARD 10 NE NE 3*
UNITS is .► 1 AB 6S WELL IN ASH PORE WATER DEEP GROUNDWATER ELEVATION BACKGROUND THRESHOLD VALUES 0.2 34 0.0005 1
ASH BASIN 1 /
� ASH I . (SHALLOW FLOW ZONE)1
CUFFSIDE r STORAGE, GENERALIZED WATER TABLE BACKGROUND THRESHOLD VALUES
/ STEAM �.cRL�r' ( BEDROCK GROUNDWATER ELEVATION
\ STATION (TRANSITION FLOW ZONE)' 2 69 0.0005 11
uwr5 1 �r I �� GENERALIZED GROUNDWATER BACKGROUND THRESHOLD VALUES
INACTIVE r FLOW DIRECTION MEAN ARSENIC (As) CONCENTRATION (pg/L) (BEDROCK FLOW ZONE)' 1 93 0.0005 1
is ASH BASIN 1 ACTIVE - 1 AB-w
N ASH BASIN _ _ _ _ AS o
MEAN STRONTIUM (Sr) CONCENTRATION (pg/L)
Nr © ASH s. �' MEAN TOTAL URANIUM (U) CONCENTRATION (pg/m L) IMAC OFTHE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
u (totap <o.000s
ASH PORE WATER v <o.a MEAN VANADIUM (V) CONCENTRATION (pg/L) 1 - UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
FILL 2010TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
WELL SCREEN
SAPROLITE
". M _ DUKE 0 so 100 200 FIGURE 6-1'
CCp °CRyw - ��� ® TRANSITION ZONE 40)
GENERAL CROSS SE
LANDFILL RO:n a, CQMPLIANCE BOUNDARY HORIZONTAL SCALE: 1"=200'BEDROCK ENERGY VERTICAL
ERTI ACAL SCALE:
1"=40' NON-CONSERVATI%
- � P � syir
_i
NOTE: CAROLINAS MEAN OF ARSENIC, STRONTII
/" DRAWN BY: J. CHASTAIN DATE: 10/22/2019
CROSS SECTION NW IS LINEAR IN NATURE AND ALL ALLUVIUM REVISED BY: D. KREFSKI DATE: 3/2/2020 AND VANADI
LOCATIONS NOT ALONG THE CROSS SECTION ARE ACTIVE ASH B
PROJECTED ONTO THE CROSS SECTION. �� CHECKED BY: T. GRANT rc DATE: 3/2/2020 ^ ^ .. ^ ACTIVE - ASH , .
e 000 _ov c coinn --
850
800
750
700
650
600
CROSS SECTION LOCATION
Rev. 1
23 April 2020

850 N — N850
mo
N N ACTIVE ASH BASIN
as
m y
Na N N N
POSSIBLE RADIAL GROUNDWATER FLOW
800 IN THIS AREA 800
SAP OLITE
Lo m
m m m m SAPROLITE
a a a ASH a
GWA-27DA / TRANSITION ZA----- ---------------- _________ _ _ _
_ _ _ _ _ _ _ _ __ _ __ ________ _ _ _ _ _ _ _ _ GWA-245LLJ Fe 97 - _ _ _ _ _ _ _ _ _ Co 0.1 ____-Z4DCo 0
0.2 00
3.6
co (Y Mn 1296 \I \ \\ _____________ _ __ - Mn 21_ _ _ _ _ _ _ _ _ _ Fe 1 3 \ Fe < 50 750 00
0 75U U A=-O2_/ Mn_________________________---<0.1 __ _________ _ Mn 52 Mn 5 0
iU \\ — / / _ -- ---- - -----------AWATERE_--- n <o.i i
------------
TRANSITION
__O ZONE1 \ O
24R 1/
0.1
— \ \ \ / / \ — \ \ \ AB-OSBRu \ \ / / Fe 54 / / \ — ;
J / --2 I \ / / \ / I \ / / \ / / / \ / I \ / C. Fe 3.5 / / \ / Tn <0.1 / J
Co 0.6 \ \ - \
LU 700 / \ / \ / C. / \ / \ / — — \ / Fe <50 \ / \ / — \ / \ / \ / Mn 171 — \ / \ / \ / \ 700 LLI
Mn 1 \ I / 1 \ I I / 1 \ I / 1 \ TI 0.1 /
BEDROCK'/
Fe 49 _
Mn 109
TI\ <0.1
650 — — \ /\— \ — \ / /\BEDROCK_ 650
BEDROCK
CROSS SECTION DOES NOT INCLUDE A BEDROCK NOTES:
EVALUATION BORING WHERE OPTICAL TELEVIEWER DATA I / \ / \ / I \ / \ / I / \ / \ / I / \ / \ I / \ / \ / I / \ / 1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
CAN BE USED TO DETERMINE GENERALIZED FRACTURE \ \ / \ / — — \ / \ / \ \ / \ / — — \ / \ / \ \ / \ / — — \ /CENTRALTENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
ORIENTATION. \ / — I \ / \ / — I \ / \ / — I \ / TO JUNE 2019.
600— 2. COBALT (Co), IRON (Fe), MANGANESE (Mn), AND THALLIUM (TI)
CONCENTRATIONS ARF IN MICROGRAMS PER ITTFR (unh)
SPO'D R --
fq
FORMER
UNITS 1-4 .►.�
- ASH BASIN 1 f "
ASH
CLIFFSIDE Y STORAGE
STEAM 'REH
STATION v
>� UNIT csi
is INACTIVE ACTIVE
ASH BASIN
c�N \ N ASH BASIN
N.
Fp .00,
LANDFILL
NOTE:
CROSSSECTION NW IS LINEAR IN NATUREANDALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
LEGEND
GWA 25S WELL IN SHALLOW LAYER
GWA 25D WELL IN DEEP LAYER
GWA 21BR WELL IN BEDROCK LAYER
AB 6S WELL IN ASH PORE WATER
V —GENERALIZED WATER TABLE
_� GENERALIZED GROUNDWATER
FLOW DIRECTION
0 ASH
ASH PORE WATER
0
FILL
SAPROLITE
TRANSITION ZONE
BEDROCK
ALLUVIUM
V
V
V
V
ASH PORE WATER ELEVATION
SHALLOW GROUNDWATER ELEVATION
DEEP GROUNDWATER ELEVATION
BEDROCK GROUNDWATER ELEVATION
-assR MEAN COBALT (Co) CONCENTRATION (ug/L)
<' MEAN IRON (Fe) CONCENTRATION (Ng/L)
MEAN MANGANEEa. MEAN THALLIUM STI)(CONCENTRATIONT(Og/L)g/L)
WELL SCREEN
COMPLIANCE BOUNDARY F
* WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
- NO DATA AVAILABLE
ANALYTICAL PARAMETER Co Fe Mn TI
REPORTING UNITS ug/L P9/L u9/L
u9/L
15A NCAC 02L STANDARD 1* 300 50
0.2*
BACKGROUND THRESHOLD VALUES
21 1700 969
(SHALLOW FLOW ZONE)1
0.2
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)' 5 1840 260
0.2
BACKGROUND THRESHOLD VALUES
2 7680 113
(BEDROCK FLOW ZONE)'
0.2
* - IMAC OF THE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
1 UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
2010 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
CROSS SECTION LOCATION
Rev. 1
23 April 2020

�1
� O 1
1
f '
■ j
1 ❑ 1
• 1
• ��
' ENERGY
(IN FEET)
.
�• �,
•
DRAWN BY: C. DAVIS DATE: 06/13/2019
' �� /
- ■ • ♦ �♦
REVISED BY: C. DAVIS DATE: 02/24/2020
CHECKED T. GRANT DATE: 02/24/2020
/
B
APPROVED BY: T. GRANT DATE: 02/24/2020
- -
(�/�'�
PROJECT MANAGER: S. SPINNER
"i' ' e
www.synterracorp.com
LEGEND
NOTES:
FIGURE 6-27a
ISOCONCENTRATION MAP
TOTAL URANIUM IN SHALLOW FLOW ZONE
ACTIVE ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
CLIFFSIDE STEAM STATION
MOORESBORO, NORTH CAROLINA
Rev. 1
23 April 2020

UNIT 6
i
Ir_
f♦ \
f♦
f♦
f ♦
f
A
m
NX
1 .0
I 1
i
(> DUKE
ENERGY
CAROL WAS N FEET)
_ - ♦' II
♦♦
��
DRAWN BY: C. DAVIS
REVISED BY: C. DAVIS
CHECKED BY: T. GRANT
APPROVED BY: T. GRANT
DATE:
DATE:
DATE:
06/13/2019
02/24/2020
02/24/2020
A
/
svnTeiid
PROJECT MANAGER: S. SPINNER
... ,.....DATE^02/24/2020
LEGEND
O�.
NOTES:
FIGURE 6-27b
ISOCONCENTRATION MAP
TOTAL URANIUM IN BEDROCK FLOW ZONE
ACTIVE ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
CLIFFSIDE STEAM STATION
MOORESBORO, NORTH CAROLINA
Rev. 1
23 April 2020

750
_
G--No
(NORTHWEST) GROUNDWATERCROSS SECTION FLOW IS PERPENDICULAR TO
FORMER UNITS 1-4 ASH BASIN
FORMER ASH BASIN
i
700
co
co
Z
0 650
W
J
W
600
550
� y
FORMER /.+F
U;'ITS 14 4V
ASH '4SIN,
ASH
CLIFFSIDE` STORAGEA'
STEAM -,�} AREA
STATION r,
UNIT 5
r3a \•; INACTIVE
J�N s• E$ ASH BASIN '_� \ �J ACTIVE
ASH BA,]
LANDFILL qH'R q0
s
ALLUVIUM
soa zss
SAPROLITE
IB-021
B
TDS 12s
/
Li
99.0
-
SO4
62
TRANSITION
ros
afi6
—
\ —
ZONE
Is
\ B 6p
504 436
I
ros Sso
1
\
\
o
ED
6ROCK/
\
/ TD
CROSS SECTION DOES NOT INCLUDE A BEDROCK
EVALUATION BORING WHERE OPTICAL TELEVIEWER DATA
CAN BE USED TO DETERMINE GENERALIZED FRACTURE
ORIENTATION.
LEGEND
GWA 10S WELL IN SHALLOW FLOW LAYER
GWA 10D WELL IN DEEP FLOW LAYER
ABANDONED WELL/
IB 1D GEOTECHNICAL BORING
GENERALIZED WATER TABLE
GENERALIZED GROUNDWATER
'..1 FLOW DIRECTION
0 ASH
did
ASH PORE WATER
® FILL
O SAPROLITE
® TRANSITION ZONE
0 BEDROCK
`1 NOTE:
CROSS SECTION G-G' IS LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
.± PROJECTED ONTO THE CROSS SECTION.
ALLUVIUM
111111- G'
(SOUTHEAST)
I
I m i/i
I N N
I � �
I
I
I
I
I
I
I
i
SAPROLITE
soa
9
�
/F
TDS
1 101
\
le -mu
TRANSITION
SAPROLITE
Lid
soa
33-7
/ ZONE _/
\
TDS 3
I-OQ R
\
/
7.0
LI0439.9
TDS
TDS198
EDROCK\
SHALLOW GROUNDWATER ELEVATION
V DEEP GROUNDWATER ELEVATION
MEAN BORON (B) CONCENTRATION (ug/L)
a MEAN LITHIUM (Li) CONCENTRATION (ug/L)
6� MEAN SULFATE (SO4) CONCENTRATION (mel-)
MEAN TOTAL DISSOLVED SOLIDS (TDS)
CONCENTRATION (mg/L)
WELL SCREEN r
COMPLIANCE BOUNDARY 1
750
700
OD
00
Z
650 Z
O
W
J
W
600
NOTES:
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
TO JUNE 2019.
2. BORON (B) AND LITHIUM (Li) CONCENTRATIONS ARE IN MICROGRAMS PER
550 LrrER (ug/L)
3. SULFATE (SO4) AND TOTAL DISSOLVED SOLIDS (TDS) CONCENTRATIONS
ARE IN MILLIGRAMS PER LITER (mg/L)
* WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS,
THE MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
- NO DATA AVAILABLE
ANALYTICAL PARAMETER B Li SO4 TDS
REPORTING UNITS Ng/L Ng/L mg/L mg/L I
15A NCAC 02L STANDARD 700 NE 250 500
BACKGROUND THRESHOLD VALUES
(SHALLOW FLOW ZONE)' 50 3 4 57
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)' 50 12 15 107
BACKGROUND THRESHOLD VALUES 50 11 17 120
(BEDROCK FLOW ZONE)'
1 - UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
2010 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
NE - NOT ESTABLISHED
CROSS SECTION LOCATION
Rev. 1
23 April 2020

750 G--No
_
(NORTHWEST) GROUNDWATERCROSS SECTION FLOW IS PERPENDICULAR TO
FORMER UNITS 1-4 ASH BASIN
FORMER ASH BASIN
it /� mm _ NNNN
700
OD
co
Q
Z
GWA-WS
As 0.6
6r Z 650
W
J
W
600
550
P' G
a � gROAO RI FFF r a
� A
�--
�"".,.� ASH 4SIN', �.•
ASH
CLIFFSIDE\ _ �: r" STORAGEA'
STEAM -,, AREAUNIT 5' �.
STATION
r3a \•; INACTIVE
ASH BASIN '_� \ �J ACTIVE
ASH BASIN
LANDFILL AwR qp
s
ALLUVIUM
V
a.4
SAPROLITE
a ozl
AS 0.54
/
sr
270
V
LO
TRANSITION
\
—
ZONE
\
6EDRbCK
\ /
_
CROSS SECTION DOES NOT INCLUDE A BEDROCK
EVALUATION BORING WHERE OPTICAL TELEVIEWER DATA
CAN BE USED TO DETERMINE GENERALIZED FRACTURE
ORIENTATION.
LEGEND
GWA 10S WELL IN SHALLOW FLOW LAYER
GWA 10D WELL IN DEEP FLOW LAYER
ABANDONED WELL/
IB 1D GEOTECHNICAL BORING
1 .
GENERALIZED WATER TABLE
GENERALIZED GROUNDWATER
1 FLOW DIRECTION
0 ASH
O ASH PORE WATER
® FILL
O SAPROLITE
® TRANSITION ZONE
0 BEDROCK
1 NOTE:
CROSS SECTION G-G' IS LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
.± PROJECTED ONTO THE CROSS SECTION.
G'
(SOUTHEAST)
it N N
ii C7 t9
GWA-125
SAPROLITE
--- 1 1 1
Sr 49
xL�3
.
- As IB o.sa
\ TRANSITION \
ZONE / \
SAPROLITE Sr
V 3
—
IEWMIRR
13
/ \ Sr 130
_
— \
gEDROCK\
O ALLUVIUM
SHALLOW GROUNDWATER ELEVATION
V DEEP GROUNDWATER ELEVATION
MEAN ARSENIC (As) CONCENTRATION (ug/L)
W�30,03 MEAN STRONTIUM (Sr) CONCENTRATION (ug/L)
V MEAN VANADIUM (V) CONCENTRATION (ug/L)
WELL SCREEN
COMPLIANCE BOUNDARY r
750
700
650
600
NOTES:
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
TO JUNE 2019.
550 2. ARSENIC (As), STRONTIUM (Sr), AND VANADIUM (V) CONCENTRATIONS ARE
IN MICROGRAMS PER LITER (u9/L).
* WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS,
THE MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
- NO DATA AVAILABLE
ANALYTICAL PARAMETER As Sr V
REPORTING UNITS ug/L u9/L u9/L
15A NCAC 02L STANDARD 10 NE 3*
BACKGROUND THRESHOLD VALUES
(SHALLOW FLOW ZONE)' 0.2 34 1
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)' 2 69 11
BACKGROUND THRESHOLD VALUES
(BEDROCK FLOW ZONE)' 1 93 1
- IMAC OF THE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
1-UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
2010 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
CROSS SECTION LOCATION
Rev. 1
23 April 2020

750
G
(NORTHWEST)
GROUNDWATER FLOW IS PERPENDICULAR TO
CROSS SECTION
FORMER UNITS 1-4 ASH BASIN
I
FORMER ASH BASIN
I
� IIIr
NNNN L
700
/
T--T-J
CD
00
a
Z
Z 650
O
W
J
W
GW/4ll15
GWA-10D I
le-o
600 / — C.
\ Fe
Mn
1 / \ Ra
550
i OR% R�VEA
\ FORMER C.
- -. G'ITS 1-4
- ASH BASIN ,
ASH
CLIFFSIDE Y STORAGE
STEAM ¢ AREA
STATION-
>� UNIT5 cr,
zQ INACTIVE ACTIVE
ASH BASIN
�cv ASH BASIN
0
/CCP
LANDFILL ID q ft
/.
00- G'
(SOUTHEAST)
I
I
Q Q
I
I
I
I
I
i
7
SAPROLITE
Mn 43
Ra \ ,
IB-OSD TRANSITION \ /
ALLUVIUM Fe zw _ CO 0.20 ZONE
Mn szo SAPROLITE Fe ze°o
Mn 160
Ra Ra
SAPROLITE A
TRANSITION
ZONE Imiiiiiii EDROCK\ \
co -as , \
-L 1Mn 9 0
6EDROCK \
/ I Ra /
CROSS SECTION DOES NOT INCLUDE A BEDROCK
EVALUATION BORING WHERE OPTICAL TELEVIEWER DATA
CAN BE USED TO DETERMINE GENERALIZED FRACTURE
ORIENTATION.
LEGEND
GWA 10S WELL IN SHALLOW FLOW LAYER
GWA 10D WELL IN DEEP FLOW LAYER
ABANDONED WELL/
IB 1D GEOTECHNICAL BORING
GENERALIZED WATER TABLE
-� GENERALIZED GROUNDWATER
FLOW DIRECTION
0 ASH
ASH PORE WATER
® FILL
�- SAPROLITE
® TRANSITION ZONE
BEDROCK
NOTE:
•�_,�' CROSS SECTION G-G' IS LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
O ALLUVIUM
SHALLOW GROUNDWATER ELEVATION
DEEP GROUNDWATER ELEVATION
a
MEAN COBALT (Co) CONCENTRATION (pg/L)
MEAN IRON (Fe) CONCENTRATION (Ng/L)
MEAN MANGANESE (Mn) CONCENTRATION (pg/L)
MEAN TOTAL RADIUM (Ra) CONCENTRATION (pCVL)
WELL SCREEN
COMPLIANCE BOUNDARY
750
700
600
NOTES:
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
TO JUNE 2019.
2. COBALT (Co), IRON (Fe), AND MANGANESE (Mn) CONCENTRATIONS ARE IN
MICROGRAMS PER LITER (pg/L). TOTAL RADIUM (Ra) CONCENTRATIONS ARE
550 IN PICOCURIES PER LITER (PCVL).
* WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS,
THE MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
- NO DATA AVAILABLE
ANALYTICAL PARAMETER Co Fe Mn Ra
REPORTING UNITS pg/L pg/L pg/L PCVL
15A NCAC 02LSTANDARD 1* 300 50 NE
BACKGROUND THRESHOLD VALUES 21 1700 969 2
(SHALLOW FLOW ZONE)1
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)' 5 1840 260 2
BACKGROUND THRESHOLD VALUES I
(BEDROCK FLOW ZON' 2 7680 113 3
E)
* - IMAC OF THE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
1 - UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
2010 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
Rev. 1
23 April 2020

800 -�:] H --a*-
(SOUTHWEST)
H'
(NORTHEAST)
FORMER UNITS 1-4
750 ASH BASIN
aav
333
SAPROLITE (� C7 C7 J FORMER ASH BASIN
N N N N
700
GWl414S
B 63 -- ---
Li
11
504 SS 1
TDS 217
SAPROLITE FILL
tGW-n1
OAD RIVER
> TRANSITION ZONE -657'
101
♦ �j
? 650 \ / 5Li 03 / / \ B I&02A 49D SAPROLITE
Z / \ TDS 413 \ / Li -
0_ \ / _ \ I 504 83
IB-02111BW B 99.0 Li 150♦� ` / / \ .
/
J \ / / \ \ \�` \ - / \ ♦♦ \ / / \ SL04 52 / TS04 103
DS 319 \ l / /\ ♦ I I!• 1+•� j,� \
� 1 • W \ / / �EDR6CK I / \ / \ / I / \ � / \ / I TDS 466
600 GWA-148R \ / / I /'1���BB 62BLi 173
SO4 54
TDS ]84. \ / I \I / ♦ I \ ROCK �► \ 1 / I \ /
/Ivy\ 1 \/\ /1�,/�\/\♦♦♦/1 \/�c Z!�..��/\
\ - \ / / \ - \ 1 / / \ '�� \ \ / / \♦♦♦ - \ 1 / / \ \ 1 / / \ - BEDROCK
550
FRACTURES CONCEPTUALLY DEPICTED ONTHIS CROSS SECTION REPRESENT GENERALIZED
ORIENTATIONS OF FRACTURES OBSERVED BASED ON TELEVIEWER LOGGING. THE DEPICTED FRACTURE _ \ / / \ - \ 1 / / GWA-11BIE
ORIE NTATIONS ACCOUNT FOR APPARENT DIP WITHI N THE PLANE OF TH E CROSS SECTION, AND / / / \ B <50
VERTICAL EXAGGERATION. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO \ I \ / Li -
500 ILLUSTRATE ATTHIS SCALE. IN ADDITION,THE DEPTHSAND LENGTHS OF FRACTURES VERSUS DEPTH \ / \ / - - \ SO4
ARE CONCEPTUAL ONLY.
LEGEND
GWA-14S WELL IN SHALLOW LAYER ® TRANSITION ZONE WELL SCREEN
GWA-14D WELL IN DEEP LAYER r-� BEDROCK 0
FGWA-14BRI WELL IN BEDROCK LAYER ® FILL - - - COMPLIANCE BOUNDARY
ABANDONED WELL/
IB 2AL SHALLOW GROUNDWATER ELEVATION a
MEAN BORON B CONCENTRATION L
GEOTECHNICAL BORING ( ) (p�✓
. MEAN LITHIUM (Li) CONCENTRATION (pg/L) DUKE
GENERALIZED WATER TABLE V DEEP GROUNDWATER ELEVATION MEAN SULFATE (SO4) CONCENTRATION (mg/L) ENEF
GENERALIZED BEDROCK FRACTURE MEAN TOTAL DISSOLVED SOLIDS (TDS) CAROLI
ORIENTATION V BEDROCK GROUNDWATER ELEVATION CONCENTRATION (mg/L)
-, GENERALIZED GROUNDWATER
FLOW DIRECTION
800
750
700
600
CROSS SECTION LOCATION
NOTES:
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
TO JUNE 2019.
2. BORON (B) AND LITHIUM (Li) CONCENTRATIONS ARE IN MICROGRAMS PER
LITER (pg/L)
3. SULFATE (SO4) AND TOTAL DISSOLVED SOLIDS (TDS) CONCENTRATIONS
ARE IN MILLIGRAMS PER LITER (mg/L)
* WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS,
THE MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
- NO DATA AVAILABLE
ANALYTICAL PARAMETER
B
Li
SO4
TDS
REPORTING UNITS
pg/L
pg/L
mg/L
mg/L
15A NCAC 02L STANDARD
700
NE
250
500
BACKGROUND THRESHOLD VALUES
(SHALLOW FLOW ZONE)'
50
3
4
57
550 BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)'
50
12
15
107
BACKGROUND THRESHOLD VALUES
(BEDROCK FLOW ZONE)'
50
11
17
120
- UPDATED BACKGROUND THRESHOLD
VALUES WERE CALCULATED
USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES
COLLECTED FEBRUARY
2010 TO DECEMBER 2018 AS SUBMITTED IN JUNE
2019.
NE - NOT ESTABLISHED
500
SAPROLITE
Rev. 1
23 April 2020

800 -�:] H --a*-
(SOUTHWEST)
750
\ U)
vaa
r r r
SAPROLITE 0 0
700
600
550
500
H'
(NORTHEAST)
FORMER UNITS 1-4
ASH BASIN
IFORMER ASH BASIN
swA-laz �� • ��_ 3333
95
v 11 1
SAPROLITE FILL _
GWA-14D � BROAD RIVER
AS 0.1>TRANSITION ZONE -65T
• �(� Sr 22s — —
�� V GS IB-wAL SAPROLITE y
AS 0.42
GWA-11BRG AS 12� AS 0.3 Sr 5- Sr 2R5 V LZ\ IB-MI V 06 /
AS 0.54
\ / / b9DR6CK I / \ / \ / I / \ 7 / \ / I V \ 0
IB-0RU ASWA-llBi 3
0.5
GWA-146R
AS L3Vr
Sr in\ \ / BEDROCK \ .� II
— \ \ / / \ — \ 1 / / '�♦ \ \ / / \♦♦♦ — \ 1 / / \ \ \ / / \ — IS
/I \ /I \ /I \
FRACTURES CONCEPTUALLY DEPICTED ON THIS CROSS SECTION REPRESENT GENERALIZED
ORIENTATIONS OF FRACTURES OBSERVED BASED ON TELEVIEWER LOGGING. THE DEPICTED FRACTURE
ORE NTATIONS ACCOUNT FOR APPARENT DIP WITHIN THE PLANE OF THE CROSS SECTION, AND
VERTICAL EXAGGERATION. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO
ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTHS AND LENGTHS OF FRACTURES VERSUS DEPTH
ARE CONCEPTUAL ONLY. \ ` / L ` \ / \ I \ V
LEGEND
GWA-14S WELL IN SHALLOW LAYER ®
TRANSITION ZONE
0
WELL SCREEN
GWA-14D WELL IN DEEP LAYER
BEDROCK
FGWA-14BRI WELL IN BEDROCK LAYER ®
FILL
— — — COMPLIANCE BOUNDARY
ABANDONED WELL/
IB 2AL GEOTECHNICAL BORING
SHALLOW GROUNDWATER ELEVATION
MEAN ARSENIC (As) CONCENTRATION (pg/L)
°
.wA
GENERALIZED WATER TABLE
MEAN STRONTIUM (Sr) CONCENTRATION (ug/L)
— —
V
DEEP GROUNDWATER ELEVATION
MEAN VANADIUM (V) CONCENTRATION (pg/L)
GENERALIZED BEDROCK FRACTURE
ORIENTATION V
BEDROCK GROUNDWATER ELEVATION
GENERALIZED GROUNDWATER
FLOW DIRECTION
SAPROLITE
800
750
700
600
550
500
♦_
FORMER \
AS14
HTASNASH
/ 1 CLIFFSIDE\ r �STORAGES Ik
STEAM AREA _.
STATION ' c� ACT
ASH BIVASIE
UN
INAITIS r NI
ASH BASNI
1 � �
-. LANDFILL MCCRAI,I,R �`I�'
NOTE: ...
CROSS SECTION H-H' IS LINEAR IN NATUREANDALL
_ LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
NOTES:
CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
TO JUNE 2019.
2. ARSENIC (As), STRONTIUM (Sr), AND VANADIUM (V) CONCENTRATIONS ARE
IN MICROGRAMS PER LITER (pg/L).
* WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS,
THE MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
- NO DATA AVAILABLE
ANALYTICAL PARAMETER
As
Sr
V
REPORTING UNITS
pg/L
fag/L
fag/L
15A NCAC 02L STANDARD
10
NE
3*
BACKGROUND THRESHOLD VALUES
(SHALLOW FLOW ZONE)'
0.2
34
1
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)'
2
69
11
BACKGROUND THRESHOLD VALUES
(BEDROCK FLOW ZONE)'
1
93
1
* - IMAC OF THE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
1 - UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
2010 TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
Rev. 1
23 April 2020

-800
(SOUTHWEST) (NORTHEAST) FDRM`�.•
` UNITS 14
ASH BASIN
STEAM 'u •AREA
\` M \ ASH
CLIFFSIDE � �SiORAGE
STATION 'c� ACTIVE
a� UNITS r SASH BASINIV
NAC=.y ASH BIAS N
FORMER UNITS 1-4 \ r
750 ASH BASIN 750 JIT�V
CCP
a oil
LANDFILL
SAPROLITE (� o C� J � FORMER ASH BASIN
NOTE:
7UU \ \ _ — 700 CROSS SECTION H-H' IS LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
/ GWA-1as a a a CROSS SECTION LOCATION
CO _—�--- _
as 0
Fe 392
00 / / \ Mn 19 1 00
Ra - SAPROLITE FILL _ _
/ / ,+�
,� J / GWA-14D BROAD RIVER ;
TRANSITION ZONE � -657'
z - r '�•,� Fe 79 IR-02AL SAPROLITE \► 650 ? NOTES:
z 650 _ \ M^
Z \ / \ / Ra / \/ Fe 250 Z
O \ /♦ / \ Mn szo - swAveRu coW�b / 111
\ / \ / 2 1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
H —►�'� \ / �• \ \ � \ / — Ra co a7 Fe eu 1 / � _ / / � CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018
Q / I r •` I \ / Fe 421 Mn 1970
\ \ / \ ff• 1 / \ \ / 1 \ \ Co IB-OQI ISB Mn 740 \ ; \ 0.456 — j •� l \ • l TO JUNE 2019.
— / 947
J \ / /\ / — \�� <-- ♦ — \ / / \ Fe 200 \ • %' \ J 2. COBALT (Co), IRON (Fe),AND MANGANESE (Mn) CONCENTRATIONS ARE IN
W I�DR(CK / \ / / ,�� / \ / I Ra lsoo / / \ / — \ / \ �:�•� \ I Lu MICROGRAMS PER LITER (pg/L). TOTAL RADIUM (Ra) CONCENTRATIONS ARE
\ \ / \ / — / /\ \ �, , \ / — \ / \ / \ I / 1•�� \ ���\ / IN PICOCURIES PER LITER (pCi/L)
IB-02BRu I \ co aB — \ / WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS,
600< \ /-_ / 4� '< \ /" was \ / \ /-1 Fe 4e — \ 600 THE MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
T GWA-14BR / \ 7 / Fe 190
co o.z 1 / \ / \ / �� \ Mn 99.0 / \ / Ra 1•ss \ / / ��/ \ - NO DATA AVAILABLE
Mn 527 — — Ra BEDROCK \ / Ii
/ — ,� \ / / \ .l / — ANALYTICAL PARAMETER Co Fe Mn Ra
/lug\� /1 �\ \ /1�,/�\/\�.�/1
/BEDROCK REPORTING UNITS pg/L pg/L pg/L pCi/L
15A NCAC 02L STANDARD 1* 300 50 NE
Ilk% \ / \ / — _ \ \ BACKGROUND THRESHOLD VALUES
„� / \ / \t•/ 1 \ � \ / \ I / 1 \ � \ / \ I / 1 \ \ \ / \ I / 1 / (SHALLOW FLOW ZONE)1
21 1700 969 2
550
/ 1� / / / /
_ _ _ - _ 550 BACKGROUND THRESHOLD VALUES
,� \ / / / �� \ / / / / / \ •••/ \ / / / \ / (TRANSITION FLOW ZONE)1 5 1840 260 2
BACKGROUDTHRESHOLD FLOW ZONES
(BEDROCK
1 2 7680 113 3
IMAC OF THE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
1 UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING
FRACTURES CONCEPTUALLY DEPICTED ON THIS CROSS SECTION REPRESENT GENERALIZED — \ /<— / — \ / /\-- \ /<— / — \ /\ DATA FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY
ORIENTATIONS OF FRACTURES OBSERVED BASED ON TELEVIEWER LOGGING. THE DEPICTED FRACTURE GW-TO DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
ORIENTATIONS ACCOUNT FOR APPARENT DIP WITHI N THE PLANE OF THE CROSS SECTION, AND / / \ / I / \/ / CoVERTICAL EXAGGERAl-
500 ILLUSTRATE ATTH SASCALE. N ADD IONNT EHE ACTUALBER DEPTHS AND LENGTHS OF FRACTURES OF FRACTURES IS FAR TOONUMEROUS VER VERSUS DEPTH — \ / — \ / I Mn / I \ / \ / I \ 5OO
ARE CONCEPTUAL ONLY. _ / \ I / \ / \ Ra -
LEGEND
GWA-14S WELL IN SHALLOW LAYER
GWA-14D WELL IN DEEP LAYER
FGWA-14BRI WELL IN BEDROCK LAYER
IB 2AL ABANDONED WELL/
GEOTECHNICAL BORING
V — GENERALIZED WATER TABLE
® TRANSITION ZONE
r— J BEDROCK
® FILL — —
SHALLOW GROUNDWATER ELEVATION
DEEP GROUNDWATER ELEVATION
GENERALIZED BEDROCK FRACTURE
ORIENTATION V BEDROCK GROUNDWATER ELEVATION
_� GENERALIZED GROUNDWATER
FLOW DIRECTION
SAPROLITE
WELL SCREEN
COMPLIANCE BOUNDARY
m MEAN COBALT (Co) CONCENTRATION (pg/L)
M 3 3 MEAN IRON (Fe) CONCENTRATION (pg/L)
" MEAN MANGANESE (Mn) CONCENTRATION (pg/L)
MEAN TOTAL RADIUM (Ra) CONCENTRATION (pCi/L)
Rev. 1
23 April 2020

D-
850 (WEST)
800 m
Q
00 750
Q
Z
z
O
Q
W
w 700
650
600
SAPROLITE
TRANSITION
ZONE
UNIT 5 INACTIVE ASH BASIN
GROUNDWATER FLOW IS PERPENDICULAR TO
CROSS SECTION IN THIS AREA
In
D'
(EAST) F- 850
B �so ASH
/ soa SAPROLITE _
--------------------------------------------------------
-- - -------------------------------------------------------
\_-_-__-_-__-_-__-_-__-_-__-_-==--ASH=-==-_-__-_-__-_-__-_-__-_-__-
usoss
----------------------------------------------- B 1 158 ❑ y
I
iASH PORE WATER B zci ------------------------------------------------ soa 1c7
---------- -_----------------------------------------_-
\ U 54.9 _ _ _ _--------------�—.- - ------------ TDS 301
______________________________________
_____________________________________
TDS 429 TRANSITION ----------------------------------- ---- 2 'L
TDS az9: ZONE usBeD V
B IG2 —------------------
\ LI 214
SAPROLITE ewA-ou
BEDROCK / — / \ _ \ rDs 33a / — / \ _ \ i / — / \ _ \ / — =-===ASH PORE WATER -_- r� 3� / B 159
5.8 MW�aS
SOa 194 B <50
TRANSITION / TDS 343 Li as MW-408RU
ZONE
T
I
\ — \ D4 113 B 150
BEDROCK / — I \ / / \ I \ / — / \ I B 165 / os za7
Li z4 / 1 BEDROCK / 1 / � soa 9B
soa / / rDs z9s
TDB 433—
/I
CROSS SECTION DOES NOT INCLUDE A BEDROCK
EVALUATION BORING WHERE OPTICAL TELEVIEWER DATA
CAN BE USED TO DETERMINE GENERALIZED FRACTURE
ORIENTATION.
LEGEND
GWA 25S WELL IN SHALLOW LAYER
eRo q�Ri�ER
GWA-25D WELL IN DEEP LAYER
,��
IFE
GWA-21BR WELL IN BEDROCK LAYER
u
WELL IN ASH PORE WATER
,.
-'FORMER-
Q UNITS 1-4
1
ABANDONED WELL/
AB 4APW
ASH BASIN
GEOTECHNICAL BORING
CSTEnME
ASH I
STORAGE
STATION v
- '.
GENERALIZED WATER TABLE
GENERALIZED GROUNDWATER
Y J Q alr5
- INACTIVE
FLOW DIRECTION
<
ASH BASIN
coN
ACTIVE
ASH BASIN
ASH
ASH PORE WATER
OG�
FA
O�FA
;r
® FILL
Aogo
SAPROLITE
® TRANSITION ZONE
LANDFILL o
,-,;I' BEDROCK
NOTE:
CROSS SECTION D-V IS LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
V
V
V
ASH PORE WATER ELEVATION
SHALLOW GROUNDWATER ELEVATION
DEEP GROUNDWATER ELEVATION
BEDROCK GROUNDWATER ELEVATION
MEAN BORON (B) CONCENTRATION (ug/L)
a MEAN LITHIUM (Li) CONCENTRATION (ug/L)
s« MEAN SULFATE (SO4) CONCENTRATION (mg/L)
MEAN TOTAL DISSOLVED SOLIDS (TDS)
CONCENTRATION (mg/L)
NA NOT AVAILABLE OR NOT MEASURED
WELL SCREEN r
COMPLIANCE BOUNDARY
NOTES:
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018 TO
JUNE 2019.
2. BORON (B) AND LITHIUM (Li) CONCENTRATIONS ARE IN MICROGRAMS PER
LITER (Ng/L)
3. SULFATE (SO4) AND TOTAL DISSOLVED SOLIDS (TDS) CONCENTRATIONS ARE
IN MILLIGRAMS PER LITER (mg/L)
- WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
-NO DATA AVAILABLE
ANALYTICAL PARAMETER B Li SO4 TDS
REPORTING UNITS Hg/L
Ng/L
mg/L
mg/L
1SA NCAC 02L STANDARD 700
NE
2S0
Soo
BACKGROUND THRESHOLD VALUES
so
(SHALLOW FLOW ZONE)'
3
4
S7
BACKGROUND THRESHOLD VALUES
50
(TRANSITION FLOW ZONE)'
12
is
107
BACKGROUND THRESHOLD VALUES
50
(BEDROCK FLOW ZONE)'
11
17
120
'-UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA
FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED
FEBRUARY 2010 TO
DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
NE - NOT ESTABLISHED
800
750 a?
❑
Q
Z
z
O
Q
W
700 w
650
600
CROSS SECTION LOCATION
Rev. 1
23 April 2020

850
800
c? 750
Q
Z
Z
O
Q
W
W 700
650
600
-
D =
UNIT 5 INACTIVE ASH BASIN
D'
(WEST)
I
I
(EAST)
GROUNDWATER FLOW IS PERPENDICULAR TO
CROSS SECTION IN THIS AREA
N
m
LA rA Lei
a
3
SAPROLITE
FILL
_ _
FILL >
-_ TRANSITION
1 1 \ -_ — ��n�io
Y_
__ --- =_:ASH= -------------------------------------------------------------_
sr 4s \ \ /
SAPROLITE--==---==---==---==---==---==---= ASH -_-==---==---==---==---==---==
�_ --------------------------- -----------------------
}.
-- ------------------------------------------------
-----
\ US-029•SLR----------------------------------------------
N Ib
/ASH PORE WATER - o- os----------------------------------------------------- s a�a a a
TZONERANSITION---------- \
U. - �:7 rL rL / — \ \ \-------------------------------- y _
------------------------------
I \- ---------
ASH PORE WATER SAPROLITE GwAos
BEDROCK o- os
_---__-_-__-__--__-- -------
_ s. s3� nnv.am
1.2
TRANSITION \ / I sr sse
_ 'ZONE \ / _ IAW-a RIJ
BEDROCK/ \ \ / I \ \ / I 449 \ / \ �0.5\ / BEDROCKI Srmi
CROSS SECTION DOES NOT INCLUDE A BEDROCK
EVALUATION BORING WHERE OPTICAL TELEVIEWER DATA
CAN BE USED TO DETERMINE GENERALIZED FRACTURE
ORIENTATION.
LEGEND
GWA 25S WELL IN SHALLOW LAYER
>) e ROgpRi�ER.
GWA-25D WELL IN DEEP LAYER
GWA-21BR WELL IN BEDROCK LAYER
_ u 1
WAS
AB 6S WELL IN ASH PORE WATER
FORMER -
Q -- UNITS 1-4 ,..
ABANDONED WELL/
AB 4APW GEOTECHNICAL BORING
ASH BASIN
ASH I
CSTESME STORAGE
V
STATION I
GENERALIZED WATER TABLE
GENERALIZED GROUNDWATER
> Q AIT5
—►
FLOW DIRECTION
-� < INACTIVE - -
c�N. ASH BASIN ACTIVE
ASH BASIN _
ASH
ASH PORE WATER
SLR .
F
'OO
�Fq
gpgo
FILL
SAPROLITE
MCCR
® TRANSITION ZONE
CCP
LANDFILL,.'FewRp ;-• r -�
"D
.6--
%Tcv:'' BEDROCK
NOTE:
_ CROSS SECTION D-D' IS LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
V ASH PORE WATER ELEVATION
SHALLOW GROUNDWATER ELEVATION
DEEP GROUNDWATER ELEVATION
V BEDROCK GROUNDWATER ELEVATION
MEAN CHROMIUM (Cr) CONCENTRATION (Ng/L)
MEAN STRONTIUM (Sr) CONCENTRATION (ug/L)
NA NOT AVAILABLE OR NOT MEASURED
WELL SCREEN
COMPLIANCE BOUNDARY
NOTES:
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN
CALCUALTED BASED ON CENTRAL TENDENCY OF DATASET
USING DATA RANGING FROM JANUARY 2018 TO JUNE 2019.
2. CHROMIUM (Cr) AND STRONTIUM (Sr) CONCENTRATIONS
ARE IN MICROGRAMS PER LITER (ug/L).
* WELLS WITH DATASETS CONTAINING FEWER THAN FOUR
VALID RESULTS, THE MOST RECENT VALID SAMPLE DATA UP
TO JUNE 2019 WAS USED.
- NO DATA AVAILABLE
ANALYTICAL PARAMETER Cr Sr
REPORTING UNITS ug/L Ng/L
15A NCAC 02L STANDARD 10 NE
BACKGROUND THRESHOLD VALUES
(SHALLOW FLOW ZONE)' 26 34
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)' 2 69
BACKGROUND THRESHOLD VALUES 3 93
(BEDROCK FLOW ZONE)'
1 - UPDATED BACKGROUND THRESHOLD VALUES WERE
CALCULATED USING DATA FROM BACKGROUND
GROUNDWATER SAMPLES COLLECTED FEBRUARY2010 TO
DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
850
800
650
600
CROSS SECTION LOCATION
Rev. 1
23 April 2020

UNIT 5 INACTIVE ASH BASIN
850 (WEST) (EAST) 850
I I
GROUNDWATER FLOW IS PERPENDICULAR TO
CROSS SECTION IN THIS AREA
m Q
J J J
��
rn ci m m
� N N N N
800 m Ln Lf) lug Ln Ln 800
Q
SAPROLITE
- _ = FILL
750
❑
Q
Z
Z
O
Q
W
W 700
650
600
_TRANSITION
ZONE
----r-_
cr(w) o.a67
co_.ASH=--
-
-----------
-
-----------------------------------------------------------
Fe 79s
Mn 69 \
\ / \
\
-- - __ --
�--------
_---
--
SAPROLITE -_______________________________ ___ _________________________
ASH =_=_=__-_�____-_�____-_�____-_�____-_�____
Crc(a ) <o�
/ \ /
--__
u
-----�---�---�---�---�==-==
----------
Mn 5960
/ ASH PORE WATER
�- ___ ___ _________-____-____-_-__-____-____-_
Ra
Q Q
Fe 62a6o
_ _
TRANSITION /
:7 C�
ZONE==__-==__-==___-cr(v1) 0.029
------------------------------
V-----
�----------------------------
SAPROLITE
I
/ \ / Fe 14182
-_-___=ASH PORE WATER =_-_-__
\BEDROCK / — \ _ \ i / Ra Ls 1 i / _ \ _ ` / — / \--___---_____-_--__--__ Mn 144z /
usozeR / \\/ ( \ / / \/ / \ / / \\/ \ / / / / ------------ -__ -__ _-_ �/ RaTRANSITION
\\/
Cr(VI) <0.025
25.1 \ \ \ ------ / \ ZONE
Fe 6266 — _ / \ GWA-09D
s93o/\I/1\\/\I/1\\/\B��CK\I/1\I/ `col)<930
Mn 432
CROSS SECTION DOES NOT INCLUDE A BEDROCK
EVALUATION BORING WHERE OPTICAL TELEVIEWER DATA
CAN BE USED TO DETERMINE GENERALIZED FRACTURE
ORIENTATION.
LEGEND
GWA 25S WELL IN SHALLOW LAYER
eR OgoRReR
GWA-25D WELL IN DEEP LAYER
GWA-21BR WELL IN BEDROCK LAYER
WELL IN ASH PORE WATER
FORMER - :-
UNITS 1-4
ABANDONED WELL/
AB 4APW
.
ASH BASIN „y s
GEOTECHNICAL BORING
STORAGE
CSTEnME
STATION v
GENERALIZED WATER TABLE
GENERALIZED GROUNDWATER
>L INACTIVE_
— FLOW DIRECTION
'a ASH BASIN ACTIVE
�N ASH BASIN
=N
ASH
ASH PORE WATER
o
L�
FOo�F
A r
ROgo
® FILL
SAPROLITE
MQQRwRogo
® TRANSITION ZONE
LANDFILL ..• r r�
BEDROCK
" - P-- NOTE:
_ CROSS SECTION D-Dr IS LINEAR IN NATURE AND ALL
" --:--'-" LOCATIONS NOTALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
V ASH PORE WATER ELEVATION
V SHALLOW GROUNDWATER ELEVATION
V DEEP GROUNDWATER ELEVATION
BEDROCK GROUNDWATER ELEVATION
MEAN CHROMIUM (Cr VI) CONCENTRATION (pg/L)
cr(VI) aoss
MEAN COBALT (Co) CONCENTRATION (pg/L)
m 7S1
MEAN IRON (Fe) CONCENTRATION (pg/L)
M S9�10
MEAN MANGANESE (Mn) CONCENTRATION (pg/L)
TOTAL RADIUM (Ra) CONCENTRATION (pCii/L)
FNAI NOT AVAILABLE OR NOT MEASURED
WELL SCREEN
COMPLIANCE BOUNDARY
NOTES:
Co 59.4 Co T
Fe 18260 Fe a6 356
Mn 2014 Mn 28
MW-40BRU
Ra 15 \ Ra C.r(vl) 0.082
Co -al
\ / BEDROCK / / Fe 159
/ _ \ Mn 196
Ra 4.6
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON CENTRAL
TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018 TO JUNE 2019.
2. HEXAVALENT CHROMIUM (Cr (VI)), COBALT (Co), IRON (Fe), AND MANGANESE (Mn)
CONCENTRATIONS ARE IN MICROGRAMS PER LITER (pg/L). TOTAL RADIUM (Ra)
CONCENTRATIONS ARE IN PICOCURIES PER LITER (pCi/L)
* WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE MOST
RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
- NO DATA AVAILABLE
ANALYTICAL PARAMETER Cr (VI) Co Fe Mn Ra
REPORTING UNITS Ug/L pg/L Ug/L pg/L pCi/L
15A NCAC 02L STANDARD
NE
1*
300
50
NE
BACKGROUND THRESHOLD VALUES
(SHALLOW FLOW ZONE)'
4
21
1700
969
2
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)'
0.6
5
1840
260
2
BACKGROUND THRESHOLD VALUES
(BEDROCK FLOW ZONE)'
0.7
2
7660
113
3
* - IMAC OFTHE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
1 - UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA FROM
BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY 2010 TO DECEMBER 2018 AS
SUBMITTED IN JUNE 2019.
NE - NOT ESTABLISHED
750 0?
Q
Z
Z
O
Q
W
700 W
650
600
Rev. 1
23 April 2020

E _
(SOUTHWEST)
m
G
J
800 I _ »
750
W
Co
°
Q
Z
Z 700
0
H
w
w
650
600
550
500
350
300
U"Is
UNIT 5 INACTIVE ASH BASIN
-------------
TDS 217 _ _ _ _ _ _ ___
------------------------
- ASH PORE WATER-_------_--- J
-- - ----- ASH -��---------- --
US-01D - U"2S-SLB -_ -
B <50 8 267 ------------------------
Li_ _ m
2a7 \ Li 54.9FILL 19
SO4 3 SO4 145 ---
.42W
\ r\\/ i \ TRANSITION
ONE
IN / \ / — B 125
Li lfi7 \ = US-GZBR
SO4 / Li lm / SAPROLITE
—
\ B US-0ns135
— I Li 12
\ / — I \ / I \ / — / \ I \ SO4 22
TD5 n
BEDROCK / — / \ — 1 / — / \ _.�� — \ _ Bus mD
\T/ lI,\/ / / \ �... . / \/ \ l \ Li 9.6 /
/ ♦\ I�\ / \ /\ / \ I�\ / \ /�(/ \ / \ s04 G5 \
— %� / �•.� — \ \ / \ / — _ IN / \ / — \ / \ �j — _ \ / \ / TDS /
\/\I/1��•�/\I/1\\•�•\I/1\\/\I%1\ / uso/4BRAI
ks IN IN log
IN IN IN
AV
IN
IN IN IN
` 1 / / \ �• ''� \ 1 / , I, / \ 1 / BEDROCK 1•�•• 1 / / \ / \ 1 / /
IN IN IN IN IN
T
T7\
Rm-- E'
(NORTHEAST)
800
750
co
Go
00
f/i m
m m
M
M
Q
IVNNN
Q'
Q'
Z
��
700
3333
Z
0
\GWA-02S
j
i
B 129
BROAD
w
Li 0.5
------e
35s--
\ RIVER
w
SO4 65
IDS 191
\\\ -666,
/
Li
504
ca5
41
---i----
GWA-02BRU / \ TDS 131
B 127 \ /
Li la7 I \ TRANSITION
SO4 G9 / 1►♦ ; ZONE
TDS 269 GWh35D — 1
/ 02B ♦ / 8 12S /
I♦x♦ \l / B a / x 1a5
/ IN Li 5.4 _ ' / SO4 63. \
1 \ 48 ♦\ / \ TDS
IN
IN
/ — F ININ
♦1 / —
\ /
I / \\ —
11 %\ / I / \ " / \\/ I / \ /
/ — IN \ — \ / \ / — IN
_ IN / \ /
— \ / IN /
— — IN / \ / — _ IN / \ /
— — IN / IN /
— _ \ / \
/
— _ IN / \ /
— \ / \ /
\
— _ IN
IN
\ / N, /
I
— — \ / \ / — \ \ / N, /
— — IN / \ /
\I
/1
\
GWA-68BRL
B
Li
9.0
/
— — NN / \ /
— \ IN
95
/ /\
/ \
FRACTURES CONCEPTUALLY DEPICTED ON THIS CROSS SECTION REPRESENT GENERALIZED / \ /
ORIENTATIONS OF FRACTURES OBSERVED BASED ON TELEVIEWER LOGGING. THE DEPICTED FRACTURE
I / \ / / \ /
IN / \ /
TS04
DS
I / /
—
302
\ / I
/ \ / /
/
IN
/ \ /
ORIENTATIONS ACCOUNT FOR APPARENT DIP WITHIN THE PLANEOFTHE CROSS SECTION, AND I
VERTICAL EXAGGERATION. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO
— —
\ / / \I
\ / \ /
\ / — I \
— — \
/ / \I
\ / \ /
N,
— —
ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTHSAND LENGTHS OF FRACTURES VERSUS DEPTH
ARECONCEPTUALONLY.
650
600
550
FORMER �...}:.
UNITS 14
ASH BASIN
' 14ASH
CLIFFSIDE\ Y STORAGE
STEAM ' AREA
STATION ' c� ACTIVE
NIT 5 or ASH BASIN
INACTIVE
.ASH BASIN' l`9
LANDFILL MCCRA�'R \`/,
NOTE:
CROSS SECTION E-E' IS LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
LEGEND
U5 4S
WELL IN SHALLOW FLOW LAYER
ASH PORE WATER ELEVATION
U5 4D
WELL IN DEEP FLOW LAYER
SHALLOW GROUNDWATER ELEVATION
U5-4BR
WELL IN BEDROCK FLOW LAYER
U5 2S SLA
WELL IN ASH PORE WATER
DEEP GROUNDWATER ELEVATION
GENERALIZED WATER TABLE
BEDROCK GROUNDWATER ELEVATION
GENERALIZED BEDROCK FRACTURE
ORIENTATION
MEAN BORON (B) CONCENTRATION (ug/L)
GENERALIZED GROUNDWATER
R
MEAN LITHIUM (Li) CONCENTRATION (ug/L)
—�
FLOW DIRECTION
T�
MEAN SULFATE (SO4) CONCENTRATION (mg/L)
MEAN TOTAL DISSOLVED SOLIDS (TDS)
0
ASH
CONCENTRATION (mg/L)
ASH PORE WATER
®
FILL
WELL SCREEN
SAPROLITE
®
TRANSITION ZONE
— — —
COMPLIANCE BOUNDARY
BEDROCK
��
BREAKLINE
NOTES:
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018 TO
TUNE 2019.
500
2. BORON (B) AND LITHIUM (Li) CONCENTRATIONS ARE IN MICROGRAMS PER
LITER (Hg/L)
3. SULFATE (SO4) AND TOTAL DISSOLVED SOLIDS (TDS) CONCENTRATIONS ARE
IN MILLIGRAMS PER LITER (mg/L)
WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
MOST RECENT VALID SAMPLE DATA UP TO TUNE 2019 WAS USED.
-NO DATA AVAILABLE
ANALYTICAL PARAMETER B Li SO4 TDS
REPORTING UNITS Ng/L Ng/L mg/L mg/L
350
1SA NCAC 02L STANDARD 700 NE 2S0 S00
BACKGROUND THRESHOLD VALUES
50 3 4 57
(SHALLOW FLOW ZONE)'
BACKGROUND THRESHOLD VALUES
50 12 15 107
(TRANSITION FLOW ZONE)'
BACKGROUND THRESHOLD VALUES
50 11 17 120
(BEDROCK FLOW ZONE)'
�-UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA
FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY 2010 TO
DECEMBER 2018 AS SUBMITTED IN TUNE 2019.
NE - NOT ESTABLISHED
300
Rev. 1
23 April 2020

(SOUT WEST) (NORTHEAST) * eRpgR
_.
pp UNIT 5 INACTIVE ASH BASIN
A
FORMERUNITS 14
\> ASH BASINHOO > N SOO 1 4CLIFFSIDE\ STORAGE
STEAM � ' AREA
STATION ' ACTIVE
� I � � NIT 5 � r ASH BASIN -
m 0 INACTIVE I ram" J
U"Is
a 0.7
750
ASH _ _ _ _ - _ _ _ 750 ap�q
00
usmn - -_ R - ASH PORE WATER = _ = li pqp
6 <0.5 - _ may`- _ _ _ _ `
_ ---_ _ FILL1 LAN FlLL MCCRgw \`/%
W \ /� / 1 / saa-s0.6 �' _ - _ Q 00 F^ W
> \ 1 .yam/ \ / as TRANSITION Q >
Z a /\ / I/\ usmn I/ \ ZONE N N N N M M Z NOTE:
/ \ / — \ Q Q CROSS SECTION E-F IS LINEAR IN NATURE AND ALL
Z 700 / — ` I \ / ; \ _ Q Q Q Q ?� 700 Z LOCATIONS NOT ALONG THE CROSS SECTION ARE
\ / 1 / �� / j / 1 / —1 / SAPROLITE 0 0 0 O PROJECTED ONTO THE CROSS SECTION.
3.8 W —ol W CROSS SECTION LOCATION se'/ — \ / \ / 11 ------ ------ BROAD
�.� RIVER LU LEGEND
1 — 1 ' /♦ — BEDROCK / — / \ — 1 ' / — ' \ T� �,/ 1 / \ — 1 ' / a, °�01OL7 \r z� QcwA.as s `.� -sss — U5-4S WELL IN SHALLOW FLOW LAYER ASH PORE WATER ELEVATION
♦ ` / \ coo 650 WELL IN DEEP FLOW LAYER
'j�BSO wox
WELL IN BEDROCK FLOW LAYER SHALLOW GROUNDWATER ELEVATION
TRANSITION
C•� / \ / 1 \ �.\ / 1 \ / \ / 1 1 \ / \ 1 ZONE WELL IN ASH PORE WATER
. / / , / , _ i — ��/ Gw� U5 2S SLA DEEP GROUNDWATER ELEVATION
;Anj
GENERALIZED WATER TABLEBEDROCK GROUNDWATER ELEVATION
`sGENERALIZED BEDROCK FRACTURE
\ ✓ 1 / \ / \ / 1 \ / 1 / \ / \ / 1 \ / 1 \ / \ 1 \ X�1 / ��\ / \ /IA ORIENTATION MEAN CHROMIUM (Cr) CONCENTRATION (ug/L)
600 _ 1 / \ — 1 ' / — ' 1 / \ — \ ' / — ' �� / �1 — \ ' / ' 1 ' / �� \ — 1 ' / ' — 600 —� GENERALIZED GROUNDWATER 117 MEAN STRONTIUM (Sr) CONCENTRATION (ug/L)
FLOW DIRECTION
ASH
WELL SCREEN
ASH PORE WATER
BEDROCK I / / \ l / / / ® FILL COMPLIANCE BOUNDARY
_
SAPROLITE
550 \\ / \I / 1 \ �\ / \I / 1 \ \ / \I / 1 \ �\ / \I / 1 \ �\ / \I / 1 \ �\ / \I 1 \ i / \I / 1 \ %�►\ \,, 550 BREAKLINE
TRANSITION ZONE
As
�•.,-��/ \ / _♦ \ — / \ / �, \ �� — / \ �f. — / \ / \ — / _ i- . BEDROCK
NOTES:
/ — �► V •/ — I �k , — I \ / — I \ `� i• \ 6wA-67BI1 \ ♦ I \ l� —
�, va �1 / •� \ / i �/ 1 ,/ �,\ / <� /,�� / A\ 1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
CENTRAL
TENDENCY OF DATAS ET USING DATA RANGING FROM JANUARY 2018 TO
500 500 DUNE
2. CHROMIUM (Cr) AND STRONTIUM (Sr) CONCENTRATIONS ARE IN MICROGRAMS
PER LITER (u9/L).
* WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
NO DATA AVAI LAB LE
ANALYTICAL PARAMETER Cr Sr
REPORTING UNITS
\\ \ / \\/ /I —/ \_/\ / \ \/ ► / \ \ / \\/ /I —/ \—/\ / \ \/ I / \ / \ /I —/ \_/\ / \ \/ I / \ \ / \\/ /I—/ \_/\ / ug/L u
350 15A NCAC 02L STANDARD 10 NE350
BACKGROUND THRESHOLD VALUES
3a (S HALLOW FLOW ZONE)' 26 34
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)' 2 69
FRACTURES CONCEPTUALLY DEPICTED ON THIS CROSS SECTION REPRESENT GENERALIZED \ / I / \ / / I \ / / \ / I / \ / / I \ / / \ / I / \ / /
ORIENTATIONS OF FRACTURES OBSERVED BASED ON TELEVIEWER LOGGING. THE DEPICTED FRACTURE / \ / — \ \ / \ / \ / — — \ \ / \ / \ / — _ \ BACKGROUND THRESHOLD VALUES 3 93
VRIENTATIONS ACCOUNT FOR ERTIAPPARENT
O CROSS SECTION, AND
CAL EXAGGERATION. THE ACTUALNUMBERO FRACT FRACTURES ISFARTOO NUMEROUSTO\ I / 1 \ ' \ I / 1 \ \ ' \ I / 1 \ \ ' (BEDROCK FLOW ZONE)' ILLUSTRATE ATTHIS SCALE. IN ADDITION, THE DEPTHS AND LENGTHS OF FRACTURES VERSUS DEPTH / — ' \ 1. / �. — 1 ' / — ' \ 1 ' / / — 1 ' / — ' \ / 1 - UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA
300 ,ARE CID NCEPTUALONLY. — \ / — `\ ' — / \ , — ' — / \ / — / 300 FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY 2010 TO
DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
Rev. 1
23 April 2020

E-
(SOUTHWEST)
m
J
800 7 7
If2 LLY N
750
0
Q
Z
Z 700
0
H
W
W
650
600
550
500
350
300
US-0Is
UNIT 5 INACTIVE ASH BASIN
as ......zs
\ — Co 119 TRANSITION -
Fe 6785o Mn 643 ZONE
I /
Ra 0.145 / GWA-02BR
US-02D \ Cr(VI) <0.025
vI) 0.034 1 / co o.l / SAPROLITE
Co 3.1
/ �•••/ / Fe 36740 Mn 125 / / us-m
Mn 872 I / Ra 17 ��� _ \/ / \ Cr (VI) 2.640
Ra LS / \— _ I� / \ / \ / Co 15
Fe 353
Mn 23
\ / — BEDROCK / — / \ — \ / — / -•T•L f — / Ra US-04D
Cr(VI) 0.105
Co (13
Fe ac \
��, / I�••`•O / \ \ / \ / — _ \ / \ / \ \ \ / \� �/ \\ \/ /C /\ \\// 1 I / �•\ '�/� /\ /I \// 1 \/i \/•�/•�\ �I \//•1 I•\•\ // /\ /I \%/ 1 \/ /\ /1 Mn 29usoR
CrIVI) 0.580m
M/
I
ks
AV
` \ / / \ �• ''� \ \ � / � , I, / \ \ / / \ / � � r BEDROCK 1•�•• \ / / \ / \ \ / /
Fe 1al
825
Mn 197 \
Ra 3.7
E'
(NORTHEAST)
MM
Im
N
� �
__L___-- BROAD
GWA-355
q4A,
---- cr(vp <onzs \\ RIVER
666'
Co
F.
]60A0\ RaTRANSITION
ZONE
/ — C icr(vl) <o.oa X <(IS 2S1 as7s
Fe 6266
Mn 5910 \ / \ I / n 119
jr
-0BBRL
o.06o
01
VFe
1
FRACTURES CONCEPTUALLY DEPICTED ON THIS CROSS SECTION REPRESENT GENERALIZED
ORIENTATIONS OF FRACTURES OBSERVED BASED ON TELEVIEWER LOGGING. THE DEPICTED FRACTURE
ORIENTATIONS ACCOUNT FOR APPARENT DIP WITHIN THE PLANEOFTHE CROSS SECTION, AND
VERTICAL EXAGGERATION.
THE ACTUAL NUMBER OF FRACTURES IS FAR TOO NUMEROUS TO
ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTHS AND
LENGTHS OF FRACTURES VERSUS DEPTH
ARE CONCEPTUAL ONLY.
800
750
R
0
Q
Z
700 Z
O
LU
W LEGEND
CROSS SECTION LOCATION
U5 4S
WELL IN SHALLOW FLOW LAYER
ASH PORE WATER ELEVATION
650 U5 4D
WELL IN DEEP FLOW LAYER
U5-4BR
WELL IN BEDROCK FLOW LAYER
SHALLOW GROUNDWATER ELEVATION
U5 2S SLA
WELL IN ASH PORE WATER
DEEP GROUNDWATER ELEVATION
V —
GENERALIZED WATER TABLE
BEDROCK GROUNDWATER ELEVATION
GENERALIZED BEDROCK FRACTURE
ORIENTATION
MEAN CHROMIUM (Cr VI) CONCENTRATION (pg/L)
600
GENERALIZED GROUNDWATER
o-m
MEAN COBALT (Co) CONCENTRATION (pg/L)
mmoo,
FLOW DIRECTION
Mn
MEAN IRON (Fe) CONCENTRATION (pg/L)
MEAN MANGANESE (Mn) CONCENTRATION (pg/L)
©
ASH
MEAN RADIUM (TOTAL)(Ra) CONCENTRATION
ASH PORE WATER
(pCi/L)
®
FILL
WELL SCREEN
SAPROLITE
550 ®
TRANSITION ZONE
— — —
COMPLIANCE BOUNDARY
BEDROCK
BREAKLINE
NOTES:
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON CENTRAL
TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018 TO JUNE 2019.
500
2. HEXAVALENT CHROMIUM (Cr (VI)), COBALT (Co), IRON (Fe), AND MANGANESE (Mn)
CONCENTRATIONS ARE IN MICROGRAMS PER LITER (pg/L). TOTAL RADIUM (Ra)
CONCENTRATIONS ARE IN PICOCURIES PER =R (pCi/L)
3. WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE MOST
RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
- NO DATA AVAILABLE
ANALYTICAL PARAMETER Cr (VI) Co Fe Mn Ra
REPORTING UNITS pg/L pg/L Pg/L pg/L POP
SSA NCAC 02L STANDARD NE 1' 300 5o NE
BACKGROUND THRESHOLD VALUES
350
(SHALLOW FLOW ZONE)' 4 21 1700 969 2
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)' 0.6 5 1840 260 2
BACKGROUND THRESHOLD VALUES 0.7 2 7680 113 3
300
1 - UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA FROM
BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY2010 TO DECEMBER 2018 AS
SUBMITTED IN JUNE 2019.
NE - NOT ESTABLISHED
Rev. 1
23 April 2020

L-
(SOUTH)
UNIT 5 INACTIVE ASH BASIN
800
mNI^�
J
> > >
FILL to j us
z 700
0
a
>
-J
J
W
-- - - - - - - - - - - - - - - - - - - - - - - - - - - -
FILL- - - - - - - - - - - - - - - - - - --_-_-_-_-_-_-_-_-_ ----------------- ---------------ASH --------
us- 0B5 ------ — — — — — — — — — — — — — — — — — — — — —
i c0.s — — — — — =— — — — — — — — — —R-
)4 27—_—_—_—_—_—__—_
S 211 — _
SAPROLITE _—
�� ---_____________-
--------------
- - - ASH PORE WATER -
TRANSITION _ _ _ _ _ usanL
B 180
u
FILL
\ US-07D B 1 331 - SAPROLITE
\ s04 2 \ / \ / — / \ / — / \ / — 141 \ / — — \ / \ / SLi 04�28.7
/ BWA� 400
229 \TDS \ I / 1 \ 504 184
TDS 362
SITION
ZONEbw
p�-
4.5 // \
so4 GWA-37s
US-OSBR I TDS 452 I \ / — B 80
\ / / 1 U 447 \ / / 1 / \ \ / U 0.6
B - / BEDROCK - / / - / / - / / - _ / _
_ 1 / SO4 5 / \ \ / \ \ / TDS 182
TDS / BEDROCK
11.6
SO4 Luc
a a: �
BROAO R/V!
FO
^:./�_'��r��
UNITS 1-4
ASH BASIN
,a.t
"CLIFFSIDE
\ \
�� A.
-r STOF
STEAM
STATION
U
UNIT
P=Q ` INACTIVE
ASH BASIN ",
<
r,
loo,
a
ASH
MccRgk'ROgO
-, LAND ILL �,
-
NOTE:
"-
CROSS SECTION L-L' IS LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
LEGEND
GWA 37S WELL IN SHALLOW LAYER
GWA 37D WELL IN DEEP LAYER
U5 5BR WELL IN BEDROCK LAYER
ABANDONED WELL/
U5 7SL GEOTECHNICAL BORING
V - GENERALIZED WATER TABLE
-o. GENERALIZED GROUNDWATER
FLOW DIRECTION
0 ASH
ASH PORE WATER
FILL
�J SAPROLITE
® TRANSITION ZONE
BEDROCK
ALLUVIUM
V ASH PORE WATER ELEVATION
V SHALLOW GROUNDWATER ELEVATION
DEEP GROUNDWATER ELEVATION
V BEDROCK GROUNDWATER ELEVATION
a
MEAN BORON (B) CONCENTRATION (ug/L)
MEAN LITHIUM (Li) CONCENTRATION (pg/L)
MEAN SULFATE (SO4) CONCENTRATION (mg/L)
MEAN TOTAL DISSOLVED SOLIDS (TDS)
CONCENTRATION (mg/L)
WELL SCREEN
COMPLIANCE BOUNDARY
- L'
(NORTH)
NOTES:
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON
CENTRAL TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018 TO
JUNE 2019.
2. BORON (B) AND LITHIUM (Li) CONCENTRATIONS ARE IN MICROGRAMS PER
LITER (Ng/L)
3. SULFATE (SO4) AND TOTAL DISSOLVED SOLIDS (TDS) CONCENTRATIONS ARE
IN MILLIGRAMS PER LITER (mg/L)
- WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE
MOST RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
- NO DATA AVAILABLE
ANALYTICAL PARAMETER B Li SO4 TDS
REPORTING UNITS Pg/L Pg/L mg/L mg/L
15A NCAC 021 STANDARD 700 NE 250 500
BACKGROUND THRESHOLD VALUES
(SHALLOW ROW ZONE)' 50 3 4 57
BACKGROUND THRESHOLD VALUES 50 12 15 107
(TRANSITION ROW ZONE)'
BACKGROUND THRESHOLD VALUES 50 11 17 120
(BEDROCK FLOW ZONE)'
' - UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA
FROM BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY 2010 TO
DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
NE - NOT ESTABLISHED
w
o�
m
z
O
>
W
J
W
CROSS SECTION LOCATION
Rev. 1
23 April 2020

L-
(SOUTH)
UNIT 5 INACTIVE ASH BASIN
800
> > >
FILL to j L6
T
R.
z 700
O
a
W
J
w
FILL
■■■■■■■■■■■■■■v--___---------------------------
G3Y=QSw-� i
ASH-
'■•
SAPROLITE
ASH • '
TRANSITION — — — — hi��l
o® lip
SAPROLITE
\ SriawAo3oo
Sr 233
o- IVus oo \ TRANSITION
us aaen BEDROCK
a 33 — / / — / \ \ \ — / \ / / — / \ \ \ — / \ / — / \ \ \ — / / — / BEDROCK
/
Sr ssl
NOTES:
-
F ..
FORMER
UNITS 1-4
ASH BASIN
s� ASH
/ Cl FFSIDE - r STORAG
1A' STEAMUNIT 5
sTAnoN � '�
P=Q ` INACTIVE f
-- - k ... ,.
ASH BASIN " \ k_ ACTIVE
'c�a i 1 `� :_ tk►� � ` = ASH BASIN
o /
qo �
LAND ILL
NOTE:
"- CROSS SECTION L-L' IS LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
LEGEND
GWA 37S WELL IN SHALLOW LAYER
GWA 37D WELL IN DEEP LAYER
U5 5BR WELL IN BEDROCK LAYER
ABANDONED WELL/
ISL GEOTECHNICAL BORING
V — GENERALIZED WATER TABLE
—o, GENERALIZED GROUNDWATER
FLOW DIRECTION
0 ASH
ASH PORE WATER
FILL
L—� SAPROLITE
® TRANSITION ZONE
BEDROCK
ALLUVIUM
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN
CALCUALTED BASED ON CENTRAL TENDENCY OF DATASET
USING DATA RANGING FROM JANUARY 2018 TO JUNE 2019.
2. CHROMIUM (Cr) AND STRONTIUM (Sr) CONCENTRATIONS
ARE IN MICROGRAMS PER LITER (u9/L).
ASH PORE WATER ELEVATION * WELLS WITH DATASETS CONTAINING FEWER THAN FOUR
VALID RESULTS, THE MOST RECENT VALID SAMPLE DATA UP
TO JUNE 2019 WAS USED.
SHALLOW GROUNDWATER ELEVATION
DEEP GROUNDWATER ELEVATION
V
BEDROCK GROUNDWATER ELEVATION
u�Q58A
MEAN CHROMIUM (Cr) CONCENTRATION (ug/L)
a 1342
MEAN STRONTIUM (SR) CONCENTRATION (Ng/L)
WELL SCREEN
COMPLIANCE BOUNDARY
- NO DATA AVAILABLE
ANALYTICAL PARAMETER Cr Sr
REPORTING UNITS P9/L Pg/L
15A NCAC 02L STANDARD 10 NE
BACKGROUND THRESHOLD VALUES
(SHALLOW FLOW ZONE)' 26 34
BACKGROUND THRESHOLD VALUES
(TRANSITION FLOW ZONE)' 2 69
BACKGROUND THRESHOLD VALUES 3 93
(BEDROCK FLOW ZONE)'
1 - UPDATED BACKGROUND THRESHOLD VALUES WERE
CALCULATED USING DATA FROM BACKGROUND
GROUNDWATER SAMPLES COLLECTED FEBRUARY 2010 TO
DECEMBER 2018 AS SUBMITTED IN JUNE 2019.
- L'
(NORTH)
CROSS SECTION LOCATION
Rev. 1
23 April 2020

L-
(SOUTH)
UNIT 5 INACTIVE ASH BASIN
800
> > >
FILL to j L6
oz 700
a
W
J
W
�■■■�■■■■■■■■■v---------------- -
■■■■■■ J■■■■■�� av--- --
�����'
'® '�
SAPROLITE
ASH PORE WATER ' QO
ZONE
AD mmmm
FILL
Cr(VI) 0.035
Fe 150 �- \ _ Ra — cr(wl is GWA-a3D SAPROLITE
Mn 8 \ / \ / \ \ _ \ / \ / \ \ _ \ Co SA \ / — — \ / \ Co 19.2 /
- I / I \ / Mn Fe 4410- \ / \ / \ I 1 MO llF. \ I
r(VEe 174 `
Ra _ I \
I) \ Mn 1464
Fe 5-4 \ / / R. 1.6—ZONeslTloN
Ra <0.599 — GWA-375
Cr(VIrr080.690 \_ / / I 1 / \ \ \ I 1 \ \ \ / I 1 / \ \ \ I \ \ / I 1 / \ \ \ I 1 \ / I / 1 59 CrCo <9 .7
_ / BEDROCK — _ / _ / — _ / _ / — — Fe 15860
Fe 4� \ / \ / \ _\ / \ \ / \ / \ \ / \ \ \ / \ / \ _\ / \ \ / \ Ra 31_\ / BEDROCK \ \ / \ / \ _ \ / 7866
Mn <5\mil\ \/ i
Ra \ I \ \ I \ \ I \ \ I \ \ I
a6
85
48
Ra
NOTES:
- L'
(NORTH)
1. CONCENTRATIONS SHOWN ARE STATISTICAL MEAN CALCUALTED BASED ON CENTRAL
TENDENCY OF DATASET USING DATA RANGING FROM JANUARY 2018 TO JUNE 2019.
2. HEXAVALENT CHROMIUM (Cr (VI)), COBALT (Co), IRON (Fe), AND MANGANESE (Nb)
CONCENTRATIONS ARE IN MICROGRAMS PER LITER (Pg/L). TOTAL RADIUM (Ra)
CONCENTRATIONS ARE IN PICOCURIES PER LITER (pCi/L)
3. WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID RESULTS, THE MOST
LEGEND
ASH PORE WATER ELEVATION
RECENT VALID SAMPLE DATA UP TO JUNE 2019 WAS USED.
Q ,
RogoRlVeR
-
NO DATA AVAILABLE
GWA 37S
WELL IN SHALLOW LAYER
SHALLOW GROUNDWATER ELEVATION
ANALYTICAL PARAMETER Cr (VI) Co Fe Mn Ra
ry
GWA 37D
WELL IN DEEP LAYER
REPORTING UNITS PNE Pg/L P
Nso pCi/L
\
DEEP GROUNDWATER ELEVATION
isN 00
02LSTANDARD NE 1* 300 SO NE
"A FORMER"' '
514 �+'
U5-5BR
WELL IN BEDROCK LAYER
BACKGROUND THRESHOLD VALUES
THRCACESHOLD
4 21 1700 969 2
'
/
UNITM ,'
ASH BASIN
V `. i I
'' y�.- ASH -
U5-7SL
0
ABANDONED WELL /
BEDROCK GROUNDWATER ELEVATION
(SHALLOW FLOW ZONE)
BACKGROUND THRESHOLD VALUES
o.6 5 1840 260 2
(TRANSITION FLOW ZONE)
, CLIFFSIDE\ A -- STORA�G
GEOTECHNICAL BORING
BACKGROUND THRESHOLD VALUES
(
STEAM 41
STATION
1., o
(.
GENERALIZED WATER TABLE
CCR-U5-05D
MEAN CHROMIUM (Cr VI) CONCENTRATION (ug/L)
0.7 2 7680 113 3
(BEDROCK FLOW ZONE)
'
<�
UNIT B
r
cr(vq
MEAN COBALT (Co) CONCENTRATION (ug/L)
- IMAC OF THE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
` INACTIVE �,
A H BASIN
r ACTIVE
ASH BASIN',
GENERALIZED GROUNDWATER
Fe
54
MEAN IRON (Fe) CONCENTRATION (ug/L)
1 - UPDATED BACKGROUND THRESHOLD VALUES WERE CALCULATED USING DATA FROM
BACKGROUND GROUNDWATER SAMPLES COLLECTED FEBRUARY 2010 TO DECEMBER 2018 AS
.,.
FLOW DIRECTION
-
-
MEAN MANGANESE (Mn) CONCENTRATION (Ng/L)
SUBMITTED IN JUNE 2019.
oG.� r,% .. ,
�.�
-
ASH
Ra
<0.599
MEAN TOTAL RADIUM (Ra) CONCENTRATION (pCi/L)
NE -NOT ESTABLISHED
(r
�FAo
r /
ASH PORE WATER
f
�rl R \ I
� `
®
FILL
WELL SCREEN
'
y
OggwRo F
SAPROLITE
- - -
COMPLIANCE BOUNDARY
DUKE
0 50 100 200
FIGURE 6-71c
GENERAL CROSS SECTION L-L'
LANDFILL �,
N
4)ENERGY
HoarzoNrAL SCALE: I°=zoo'
RLL
u �
qo -
®
TRANSITION ZONE
VERTICAL SCALE: 1"=40'
VARIABLE GROUP
BEDROCK
CARO
5X VERTICAL EXAGGERATION
MEAN OF CHROMIUM (VI), COBALT, IRON, MANGA
"-
CROSS SECTION L-L' IS LINEAR IN NATUREAND ALL
IN DATE: 10/22/2019
DRAWN BY:1.REVISED BY: D. REF. KREFSKI DATE: 3/2/2020
AND TOTAL RADIUM
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
ALLUVIUM
L�
CHECKED BY: T^GRANT
-- DATE: 3/2/2020
UNIT 5INACTIVE ASH BASIN
CROSS SECTION LOCATION
Rev. 1
23 April 2020

TABLES

TABLE 4-3
BACKGROUND VALUES FOR GROUNDWATER
CORRECTIVE ACTION PLAN UPDATE
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC
Constituent
Reporting
Unit
15A NCAC
02L
Standard
2017
Background Threshold Values'
g
2019 Updated
Background Threshold ValueS2
g
Piedmont
Background
Threshold
Values Range
Shallow
Flow Zone
Deep
Flow Zone
Bedrock
Flow Zone
Shallow
Flow Zone
Deep
Flow Zone
Bedrock
Flow Zone
pH
S.U.
6.5-8.5
4.4-6.1
4.8-6.1
5.4-7.4
4.0-6.0
4.9-7.2
4.5-7.5
3.6-9
Alkalinity
mg-CaCO3/L
NE
14
20
53
19
54
56
19-379
Aluminum
pg/L
NE
1 253
290
208
820
483
309
100-1,238
Antimony
pg/L
1*
1
1
1
0.5
0.5
1
0.5-2.9
Arsenic
ug/L
10
1
1
1
0.2
2
1
0.2-6.35
Barium
pg/L
700
73
23
19
94
44
19
10.52 - 840
Beryllium
p9/L
4*
0.2
0.2
1
0.2
0.2
0.2
0.0625-1
Bicarbonate
mg-CaCO3/L
NE
14
18
69
19
58
59
19-388
Boron
pg/L
700
50
50
50
50
50
50
50-176.8
Cadmium
pg/L
2
1
1
1
0.09
1
1
0.08 - 1
Calcium
mg/L
NE
3
11
16
4
13
17
4-111
Carbonate
mg-CaCO3/L
NE
5
5
5
5
5
5
5-10
Chloride
mg/L
250
8
5
9
8
8
8
3.34 - 250
Chromium
pg/L
10
4
2
4
26
2
3
43,491
Chromium (VI)
pg/L
10
0.5
0.2
0.1
4
0.6
0.7
0.03-12
Cobalt
pg/L
1*
11
5
1
21
5
2
0.088-88.85
Copper
p9/L
1,000
7
10
5
9
8
5
0.5 - 17.15
Fluoride
mg/L
2
---
---
---
0.1
0.1
0.1
Iron
p9/L
300
684
515
6,220
1,700
1,840
7,680
56.3 - 37,500
Lead
pg/L
15
1
1
1
1
0.3
1
0-2
Lithium
ug/L
NE
---
---
---
3
12
11
2-95.39
Magnesium
mg/L
NE
2
2
2
2
2
2
1 -45
Manganese
Ng/L
50
169
78
89
969
260
113
2,655,496
Mercury
pg/L
1
0.2
0.2
0.2
0.2
0.2
0.2
0.05 - 0.5
Methane
Ng/L
NE
10
3
10
10
10
10
1-2,505
Molybdenum
pg/L
NE
1
1
2
0.6
4
2
0.5 - 26.2
Nickel
pg/L
100
6
13
5
12
13
7
0.87-48
Nitrate + Nitrite
mg-N/L
NE
9
3
1
4
3
1
0.02-6.3
Potassium
mg/L
NE
5
5
5
5
1 6
5
1.609-18.8
Selenium
pg/L
20
1
1
1
0.5
1
1
0.5 - 2.4
Sodium
mg/L
NE
6
4
7
6
9
8
6-19
Strontium
pg/L
NE
37
56
107
34
69
93
27-2,120
Sulfate
mg/L
250
1
10
15
4
15
17
1.2 - 510
Sulfide
mg/L
NE
0.1
0.1
0.1
0.1
0.1
0.1
0.1-2
TDS
mg/L
500
75
71
120
57
107
120
50 - 1,200
Thallium
pg/L
0.2*
0.1
0.1
0.2
0.2
0.2
0.2
0.1-0.2
TOC
mg/L
NE
1
1
1
1
2
1
1- 12.3
Total Radium
pCi/L
NE
3
2
3
2
2
3
0.494-35
Total Uranium
pg/mL
NE
0.0005
0.0005
0.0005
0.0005
0.0005
0.0005
0.0002-0.864
Vanadium
pg/L
0.3*
1
1
0.4
1
11
1
0.33 - 25.8
Zinc
N /L
1,000
15
15
10
26
14
15
5 - 140
Prepared by: HES Checked by: JHG
Notes:
2017 background threshold values (BNs) approved by North Carolina Department of Environmental Quality (NCDEQ) on September 1, 2017.
Background threshold values (BNs) have been rounded to similar levels of precision as 15A North Carolina Administrative Code (NCAC) 02L Standard or Interim Maximum
Allowable Concentration (IMAC).
--- - BTV was not calculated for constituent.
* - IMAC of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013.
' - BNs were calculated using data from background groundwater samples collected June 2015 to September 2017
- Updated BNs were calculated using data from background groundwater samples collected February 2010 to December 2018
3 - Piedmont background threshold value ranges include the Duke Energy calculated 2017' and 20192 background threshold values from 10 Duke Energy facilities located in the
Piedmont physiographic region (Allen Steam Station, Belews Creek Steam Station, Buck Steam Station', Cape Fear Steam Electric Plant', Cliffside Steam Station, Dan River
Steam Station', Marshall Steam Station, Mayo Steam Electric Plant, Riverbend Steam Station', and Roxboro Steam Electric Plant).
pg/L - micrograms per liter
pg/ml- - micrograms per milliliter
mg/L - milligrams per liter
mg-CaCO3/1- - milligrams calcium carbonate per liter
mg-N/L - milligrams nitrogen per liter
NE - not established
pCi/L - picocuries per liter
S.U. - standard units
TDS - total dissolved solids
TOC - total organic carbon
Rev. 1
Page 1 of 1
23 April 2020

TABLE 6-5
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019
ACTIVE ASH BASIN
CORRECTIVE ACTIVE PLAN UPDATE
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC
Analytical Parameter
pH
Arsenic
Boron
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Strontium
Sulfate
Thallium
Total
Dissolved
Solids
Total Radium
Total Uranium
Vanadium
Reporting Units
S.U.
Irg/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
mg/L
Ng/L
mg/L
pCi/L
Ng/mL
Ng/L
15A NCAC 02L Standard
6.5 - 8.5
10
700
10
10
1*
300
NE
50
NE
250
0.2*
500
NE
NE
0.3*
2017 Background Threshold Values (Shallow Flow Zone)'
4.4 - 6.1
1
50
0.5
4
11
684
NE
169
37
1
0.1
75
3
0.0005
1
2019 Background Threshold Values (Shallow Flow Zone)Z
4.0 - 6.0
0.2
50
4
26
21
1700
3
969
34
4
0.2
57
2
0.0005
1
2019 Background Dataset Range (Shallow Flow Zone )2
3.3 - 6.1
<0.1 - 0.73
<50
<0.025 - 4.8
<0.5 - 26.2
0.16 - 22.9
<50 - 5750
<0.5 - 4.6
6.7 - 1000
6.8 - 103
<1 - 5.5
<0.1 - 0.3
<25 - 10700
0.0976 - 1.961
<0.0002 - <0.0005
<0.3 - 1.9
2017 Background Threshold Values (Deep Flow Zone)'
4.8 - 6.1
1
50
0.2
2
5
515
NE
78
56
10
0.1
71
2
0.0005
1
2019 Background Threshold Values (Deep Flow Zone)Z
4.9 - 7.2
2
50
0.6
2
5
1840
12
260
69
15
0.2
107
2
0.0005
11
2019 Background Dataset Range (Deep Flow Zone)Z
3.8 - 7.3
<0.1 - 2
<50 - 150
<0.025 - 1.2
<0.5 - 9.9
<0.1 - 6.1
<50 - 3200
1.5 - 13.4
5.2 - 408
6.3 - 70.5
<1 - 18.5
<0.1 - <0.2
<25 - 407
0.017 - 2.323
<0.0005
<0.3 - 12.2
2017 Background Threshold Values (Bedrock Flow Zone)'
5.4- 7.4
1
50
0.1
4
1
6220
NE
89
107
15
0.2
120
3
0.0005
0.4
2019 Background Threshold Values (Bedrock Flow Zone) Z
4.5 - 7.5
1
50
0.7
3
2
7680
11
113
93
17
0.2
120
3
0.0005
1
2019 Background Dataset Range (Bedrock Flow Zone )2
4.8 - 7.6
<0.1 - 1.2
<50 - 83
<0.025 - 0.8
<0.5 - 10.5
<0.1 - 2.6
1 <50 - 11000
1.1 - 7.3
1 5 - 134
16.6 - 116
1 <1 - 17.6
<0.1 - 0.5
<25 - 330
0 - 3.46
<0.0005
<0.3 - 1.5
Sample ID Flow Zone
Mean, Geomean, or Median Result3
Background Locations
BG-01S
Shallow
4.9
< 0.1
< 50
0.230
0.9
1.7
171
1.6
39
21
1
< 0.1
41
0.538
< 0.0005
< 0.3
GWA-24S
Shallow
5.1
0.1
< 50
0.134
1.4
5.2
113
2.0
52
10
2
< 0.1
30
< 0.732
-
0.5
GWA-25S
Shallow
5.2
< 0.1
< 50
0.094
< 0.5
2.7
88
1.7
26
36
< 1
< 0.1
38
-
-
< 0.3
BG-01D
Deep
5.7
0.1
< 50
0.045
< 0.5
0.6
< 50
1.7
12
30
2
< 0.1
56
0.772
< 0.0005
< 0.3
GWA-24D
Deep
5.5
< 0.1
< 50
0.032
< 0.5
0.2
< 50
1.7
5
24
3
< 0.1
45
< 0.443
-
< 0.3
BG-01BRA
Bedrock
11.5
-
< 50
-
-
-
-
-
-
-
-
-
-
-
-
GWA-24BR
Bedrock
6.0
< 0.1
< 50
0.038
< 0.5
0.1
1 54
1 2.8
1 < 5
1 29
1 7
1 < 0.1
52
-
< 0.3
MW-22BR
Bedrock
6.4
0.1
< 50
0.084
< 0.5
1.0
369
2.7
49
43
8
< 0.1
67
-
0.3
MW-22DR
Bedrock
5.8
< 0.1
< 50
0.036
< 0.5
1.2
511
2.3
52
24
5
< 0.1
39
< 0.3
MW-24DR
Bedrock
7.2
< 0.1
< 50
0.033
0.5
< 0.1
1297
6.9
58
80
11
< 0.1
108
2.134
< 0.0005
< 0.3
Within the Waste Boundary Locations
AB-03MA15
Ash Pore Water
9.6
282
1708
< 0.025
0.7
< 0.1
< 50
210
< 5
1358
112
< 0.1
327
< 0.0939
0.0003
109
AB-03S
Ash Pore Water
7.4
372
2970
< 0.025
1.0
1.0
4268
119
1185
3007
386
0.7
975
0.564
0.0027
5.1
AB-03SL
Ash Pore Water
9.6
851
1138
< 0.025
1.1
0.1
128
198
32
897
66
< 0.1
191
1.207
0.0001
75.8
AB-04LA15
Ash Pore Water
5.6
184
606
0.051
0.6
5.4
4108
14.5
686
354
1
0.3
77
1.420
0.0001
1.4
AB-04S
Ash Pore Water
9.4
92.6
2513
< 0.025
< 0.5
0.1
< 50
119
< 5
2207
127
< 0.1
471
0.784
0.0006
41.8
AB-04SL
Ash Pore Water
9.0
1 1692
1506
0.051
0.7
0.1
97
1 56.5
9
1640
31
1 < 0.1
172
0.415
0.0056
45.9
AB-04UA15
Ash Pore Water
10.0
92.3
2913
< 0.025
0.8
< 0.1
< 50
141
< 5
2270
126
< 0.1
470
1.190
0.0001
38.9
AB-05S
Ash Pore Water
8.0
1782
5242
< 0.025
< 0.5
0.1
1728
92.4
211
3540
88
< 0.1
423
1.146
0.1167
1.6
AB-06S
Ash Pore Water
8.6
323
8380
0.058
< 0.5
< 0.1
161
103
46
2510
111
< 0.1
377
0.946
0.0010
8.9
AB-07S
Ash Pore Water
9.2
157
1760
0.048
0.7
0.1
< 50
133
11
1430
97
0.1
352
< 0.695
0.0017
52.0
AB-08S
Ash Pore Water
7.9
65.1
4360
0.033
< 0.5
0.4
120
151
73
2775
842
1.0
1605
< 0.851
0.0725
52.5
AB-09S
Ash Pore Water
8.6
1965
5910
1 0.071
< 0.5
< 0.1
119
106
43
2335
1 139
< 0.1
415
0.329
0.0019
0.7
AB-01S
Shallow
5.2
0.3
50
< 0.025
< 0.5
68.6
1478
2.5
6045
32
4
0.5
110
-
0.0001
0.4
AB-02S
Shallow
5.5
0.8
330
< 0.025
1.9
39.7
9102
2.8
17598
76
24
0.3
124
-
0.5
AB-03I
Shallow
6.6
3.1
50
0.447
1.1
0.2
156
5.8
127
131
3
0.4
70
-
-
2.4
AB-08I
Shallow
6.4
3.1
809
< 0.025
< 0.5
11.8
24250
1.8
10570
109
24
0.1
201
0.750
0.0004
< 0.3
CLMW-05S
Shallow
5.2
0.2
< 50
< 0.025
0.4
56.6
294
1 0.9
4790
25
4
0.4
1 65
-
-
< 0.3
AB-01D
Deep
6.6
0.2
804
1 < 0.025
1.3
1.1
9187
4.5
2317
256
36
< 0.1
302
0.4
AB-02D
Deep
6.7
0.1
291
0.027
2.5
2.6
17746
15.3
2524
345
50
< 0.1
259
< 0.3
AB-03BRUA
Deep
11.4
-
60
-
-
-
-
-
-
-
-
-
-
-
-
AB-04D
Deep
4.6
0.1
< 50
0.095
< 0.5
5.3
55
1.9
180
8
< 1
< 0.1
30
< 0.0005
< 0.3
AB-05BRU
Deep
5.4
0.4
< 50
0.031
< 0.5
3.5
104
2.3
171
38
5
1 0.1
43
-
0.3
AB-06D
Deep
5.2
0.1
< 50
0.027
< 0.5
0.6
< 50
1 1.6
38
29
< 1
< 0.1
34
< 0.0005
< 0.3
AB-07BRU
Deep
7.4
-
94
1 -
-
-
-
-
-
-
-
-
-
-
-
-
AB-08BRU
Deep
6.6
0.5
438
< 0.025
1.5
1.4
1357
14.4
245
172
9
< 0.1
237
1.164
0.0015
0.4
AB-09D
Deep
5.9
0.2
77
0.039
0.6
12.0
580
3.4
254
42
3
0.1
48
0.777
0.0001
0.3
AB-01BROR
Bedrock
7.0
0.2
397
0.034
15.1
3.8
1550
6.9
1555
268
1 11
< 0.1
364
-
-
0.7
AB-02BRO
Bedrock
6.9
0.9
476
< 0.025
2.1
8.7
12352
1.8
2188
517
53
< 0.1
292
0.4
AB-03BR
Bedrock
12.4
-
46
-
-
-
-
-
-
AB-03BRA
Bedrock
12.5
-
33
1 -
-
-
-
-
-
AB-04BR
Bedrock
6.3
< 0.1
< 50
< 0.025
< 0.5
< 0.1
11847
5.8
155
105
4
< 0.1
120
2.037
< 0.0005
< 0.3
AB-05BR
Bedrock
5.5
0.1
< 50
0.029
1 0.4
1 1.7
49
1.6
109
1 23
6
< 0.1
47
-
-
< 0.3
AB-06BR
Bedrock
6.3
< 0.1
< 50
0.026
0.5
< 0.1
4214
9.1
69
101
5
< 0.1
89
< 0.0005
< 0.3
AB-07BR
Bedrock
7.8
0.4
92
< 0.025
2.5
0.2
1018
10.6
1 168
168
5
< 0.1
163
3.285
0.0003
0.3
Rev. 1
Page 1 of 4
23 April 2020

TABLE 6-5
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019
ACTIVE ASH BASIN
CORRECTIVE ACTIVE PLAN UPDATE
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC
Analytical Parameter
pH
Arsenic
Boron
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Strontium
Sulfate
Thallium
Total
Dissolved
Solids
Total Radium
Total Uranium
Vanadium
Reporting Units
S.U.
lig/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
mg/L
Ng/L
mg/L
pCi/L
Ng/mL
Ng/L
15A NCAC 02L Standard
6.5 - 8.5
10
700
10
10
1*
300
NE
50
NE
250
0.2*
500
NE
NE
0.3*
2017 Background Threshold Values (Shallow Flow Zone)'
4.4 - 6.1
1
50
0.5
4
11
684
NE
169
37
1
0.1
75
3
0.0005
1
2019 Background Threshold Values (Shallow Flow Zone)Z
4.0 -6.0
0.2
50
4
26
21
1700
3
969
34
4
0.2
57
2
0.0005
1
2019 Background Dataset Range (Shallow Flow Zone )2
3.3 - 6.1
<0.1 - 0.73
<50
<0.025 - 4.8
<0.5 - 26.2
0.16 - 22.9
<50 - 5750
<0.5 - 4.6
6.7 - 1000
6.8 - 103
<1 - 5.5
<0.1 - 0.3
<25 - 10700
0.0976 - 1.961
<0.0002 - <0.0005
<0.3 - 1.9
2017 Background Threshold Values (Deep Flow Zone)'
4.8 - 6.1
1
50
0.2
2
5
515
NE
78
56
10
0.1
71
2
0.0005
1
2019 Background Threshold Values (Deep Flow Zone)Z
4.9 - 7.2
2
50
0.6
2
5
1840
12
260
69
15
0.2
107
2
0.0005
11
2019 Background Dataset Range (Deep Flow Zone)Z
3.8 - 7.3
<0.1 - 2
<50 - 150
<0.025 - 1.2
<0.5 - 9.9
<0.1 - 6.1
<50 - 3200
1.5 - 13.4
5.2 - 408
6.3 - 70.5
<1 - 18.5
<0.1 - <0.2
<25 - 407
0.017 - 2.323
<0.0005
<0.3 - 12.2
2017 Background Threshold Values (Bedrock Flow Zone)'
5.4 - 7.4
1
50
0.1
4
1
6220
NE
89
107
15
0.2
120
3
0.0005
0.4
2019 Background Threshold Values (Bedrock Flow Zone) Z
4.5 - 7.5
1
50
0.7
3
2
7680
11
113
93
17
0.2
120
3
0.0005
1
2019 Background Dataset Range (Bedrock Flow Zone )2
4.8 - 7.6
<0.1 - 1.2
<50 - 83
<0.025 - 0.8
<0.5 - 10.5
<0.1 - 2.6
1 <50 - 11000
1.1 - 7.3
1 5 - 134
16.6 - 116
1 <1 - 17.6
<0.1 - 0.5
<25 - 330
0 - 3.46
<0.0005
<0.3 - 1.5
Sample ID I Flow Zone
Mean, Geomean, or Median Result3
Within the Waste Boundary Locations (Continued)
AB-08BR
Bedrock
6.4
0.8
336
< 0.025
0.9
1.3
2095
8.0
577
164
13
< 0.1
246
1.101
0.0010
0.2
AB-09BR
Bedrock
7.4
0.3
< 50
< 0.025
0.6
0.2
2035
8.3
91
93
15
< 0.1
117
0.661
0.0001
0.3
Between Waste Boundary and Compliance Boundary
Upgradient of the Ash Basin
GWA-23D
Deep
5.2
< 0.1
< 50
0.062
< 0.5
0.8
< 50
1.7
9
16
< 1
< 0.1
61
-
-
< 0.3
MW-21D
Deep
5.1
0.1
< 50
0.077
< 0.5
0.9
178
1.5
12
22
2
< 0.1
33
-
-
< 0.3
MW-24D
Deep
5.2
0.2
< 50
0.059
< 0.5
0.1
< 50
1.6
< 5
26
< 1
< 0.1
41
0.427
< 0.0005
< 0.3
CCR-17BR
Bedrock
6.0
< 0.1
< 50
< 0.025
2.0
2.0
143
2.1
47
33
6
< 0.1
68
0.906
< 0.0005
0.3
GWA-48BR
Bedrock
6.7
< 0.1
< 50
< 0.025
0.6
< 0.1
2300
6.3
49
66
11
< 0.1
91
-
-
< 0.3
MW-21BR
Bedrock
6.9
0.2
< 50
0.029
< 0.5
< 0.1
< 50
4.0
55
53
8
< 0.1
99
-
0.3
Downgradient of the Ash Basin
CCR-06S
Shallow
4.3
7.0
1317
-
2.5
97.6
-
9.1
-
-
508
0.5
867
3.664
-
CCR-07S
Shallow
6.6
0.2
2714
0.042
0.6
3.0
70
0.9
5496
2648
495
0.5
1153
0.776
< 0.3
CCR-11S
Shallow
7.1
0.1
1207
-
< 0.5
0.5
-
0.8
-
-
125
< 0.1
476
0.624
-
CCR-12S
Shallow
5.0
0.4
1144
3.475
4.7
16.5
300
3.7
3512
74
47
0.2
177
2.310
< 0.3
CCR-16S
Shallow
4.4
0.9
2580
-
1.1
77.5
-
2.8
-
-
76
0.2
174
1.493
-
-
CLMW-01
Shallow
4.7
0.8
1420
0.203
3.1
2.4
224
1.2
213
1 895
111
0.5
318
1.446
< 0.0005
< 0.3
CLMW-06
Shallow
5.0
< 0.1
< 50
0.123
< 0.5
11.5
144
1.1
165
17
< 1
< 0.1
34
-
-
< 0.3
GWA-20S
Shallow
6.4
0.2
283
0.104
0.6
13.3
968
< 0.5
6013
149
92
< 0.1
349
0.487
< 0.0005
< 0.3
GWA-26S
Shallow
4.8
0.1
< 50
0.032
0.6
0.8
243
1.1
22
< 5
< 1
< 0.1
< 25
-
-
< 0.3
GWA-28S
Shallow
4.8
0.2
< 50
0.109
1.1
2.3
244
1.8
35
5
2
0.1
30
0.3
GWA-42S
Shallow
5.3
< 0.1
29
0.120
< 0.5
0.7
41
-
14
87
49
< 0.1
81
-
< 0.3
GWA-43S
Shallow
5.1
0.1
79
0.464
0.9
1 1.3
174
0.9
21
167
44
< 0.1
92
-
-
< 0.3
GWA-57S
Shallow
5.5
0.1
< 50
< 0.025
< 0.5
14.5
246
2.9
1855
132
99
< 0.1
207
0.518
0.0004
0.3
GWA-58S
Shallow
5.6
0.1
< 50
1.700
1.4
4.2
40
2.2
1890
175
245
0.1
510
< 1.14
< 0.0005
0.3
GWA-63S
Shallow
5.8
< 0.1
< 50
0.290
31.6
2.8
188
2.4
485
13
1
0.1
32
< 0.855
< 0.0005
< 0.3
MW-08S
Shallow
7.0
0.3
206
0.025
1.0
3.6
1123
< 0.5
2910
134
57
< 0.1
310
0.976
0.0002
0.4
MW-los
Shallow
5.1
0.5
216
0.552
1.0
1.6
334
1 2.1
197
56
60
0.1
189
0.652
-
0.3
MW-11S
Shallow
5.3
0.2
766
1.617
6.0
1.2
235
2.1
1754
47
40
< 0.1
230
0.672
< 0.0005
< 0.3
CCR-04D
Deep
5.4
0.1
56
-
0.5
0.8
-
1.0
-
-
22
0.1
84
0.753
-
-
CCR-05D
Deep
5.2
0.2
55
< 0.5
10.7
1.7
12
0.1
88
0.570
CCR-06D
Deep
5.0
1.4
1464
-
2.6
5.9
-
4.0
-
-
196
0.4
361
1.077
-
CCR-07D
Deep
5.6
< 0.1
616
0.139
< 0.5
< 0.1
< 50
1.1
99
155
35
0.3
146
1.247
-
< 0.3
CCR-08D
Deep
5.2
7.2
1991
0.051
< 0.5
294
< 50
1 4.4
8995
1350
328
1.5
673
1.355
< 0.0005
< 0.3
CCR-09D
Deep
4.7
2.1
838
-
0.7
83.0
-
2.1
-
-
321
0.1
461
0.716
-
-
CCR-11D
Deep
6.8
1 0.1
1210
-
< 0.5
2.1
-
< 0.5
-
-
94
0.2
379
0.837
-
CCR-12D
Deep
6.2
0.2
373
0.028
1.2
9.4
13800
6.6
1037
76
25
< 0.1
173
1.540
< 0.3
CCR-13D
Deep
5.0
< 0.1
54
0.028
< 0.5
1.5
82
2.0
35
14
3
< 0.1
41
< 0.646
< 0.3
CCR-14D
Deep
4.7
0.3
1095
-
< 0.5
1.6
-
3.5
-
-
65
0.2
259
1.260
-
CCR-15D
Deep
4.8
< 0.1
117
< 0.025
1.0
3.6
< 50
0.9
102
10
< 1
< 0.1
39
< 0.626
< 0.3
CCR-16D
Deep
6.2
0.1
30
-
< 0.5
0.2
-
4.4
-
-
3
< 0.1
68
0.716
-
-
GWA-20D
Deep
5.7
0.2
921
0.041
< 0.5
100
1664
2.0
6015
549
178
0.7
433
1.551
< 0.0005
< 0.3
GWA-27DA
Deep
5.1
0.2
980
0.127
0.7
0.8
97
1.5
1296
107
65
0.2
261
0.510
< 0.0005
< 0.3
GWA-28BRU
Deep
6.3
0.3
< 50
0.029
0.5
5.5
7330
9.6
53
50
11
< 0.1
98
-
-
< 0.3
GWA-43D
Deep
6.3
0.1
< 50
0.128
0.7
0.3
< 50
21.5
< 5
165
81
< 0.1
253
1 -
0.7
GWA-51D
Deep
5.1
1.2
796
0.526
1.9
71.3
141
3.4
8184
237
229
0.3
486
1 5.815
< 0.0005
1 0.3
Rev. 1
Page 2 of 4
23 April 2020

TABLE 6-5
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019
ACTIVE ASH BASIN
CORRECTIVE ACTIVE PLAN UPDATE
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC
Analytical Parameter
pH
Arsenic
Boron
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Strontium
Sulfate
Thallium
Total
Dissolved
Solids
Total Radium
Total Uranium
Vanadium
Reporting Units
S.U.
Irg/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
mg/L
Ng/L
mg/L
pCi/L
Ng/mL
Ng/L
15A NCAC 02L Standard
6.5 - 8.5
10
700
10
10
1*
300
NE
50
NE
250
0.2*
500
NE
NE
0.3*
2017 Background Threshold Values (Shallow Flow Zone)'
4.4 - 6.1
1
50
0.5
4
11
684
NE
169
37
1
0.1
75
3
0.0005
1
2019 Background Threshold Values (Shallow Flow Zone)Z
4.0 - 6.0
0.2
50
4
26
21
1700
3
969
34
4
0.2
57
2
0.0005
1
2019 Background Dataset Range (Shallow Flow Zone )2
3.3 - 6.1
<0.1 - 0.73
<50
<0.025 - 4.8
<0.5 - 26.2
0.16 - 22.9
<50 - 5750
<0.5 - 4.6
6.7 - 1000
6.8 - 103
<1 - 5.5
<0.1 - 0.3
<25 - 10700
0.0976 - 1.961
<0.0002 - <0.0005
<0.3 - 1.9
2017 Background Threshold Values (Deep Flow Zone)'
4.8 - 6.1
1
50
0.2
2
5
515
NE
78
56
10
0.1
71
2
0.0005
1
2019 Background Threshold Values (Deep Flow Zone)Z
4.9 - 7.2
2
50
0.6
2
5
1840
12
260
69
15
0.2
107
2
0.0005
11
2019 Background Dataset Range (Deep Flow Zone)Z
3.8 - 7.3
<0.1 - 2
<50 - 150
<0.025 - 1.2
<0.5 - 9.9
<0.1 - 6.1
<50 - 3200
1.5 - 13.4
5.2 - 408
6.3 - 70.5
<1 - 18.5
<0.1 - <0.2
<25 - 407
0.017 - 2.323
<0.0005
<0.3 - 12.2
2017 Background Threshold Values (Bedrock Flow Zone)'
5.4- 7.4
1
50
0.1
4
1
6220
NE
89
107
15
0.2
120
3
0.0005
0.4
2019 Background Threshold Values (Bedrock Flow Zone) Z
4.5 - 7.5
1
50
0.7
3
2
7680
11
113
93
17
0.2
120
3
0.0005
1
2019 Background Dataset Range (Bedrock Flow Zone )2
4.8 - 7.6
<0.1 - 1.2
<50 - 83
<0.025 - 0.8
<0.5 - 10.5
<0.1 - 2.6
1 <50 - 11000
1.1 - 7.3
1 5 - 134
16.6 - 116
1 <1 - 17.6
<0.1 - 0.5
<25 - 330
0 - 3.46
<0.0005
<0.3 - 1.5
Sample ID I Flow Zone
Mean, Geomean, or Median Result3
Downgradient of the Ash Basin (Continued)
GWA-57BRU
Deep
6.9
1.3
78
< 0.025
< 0.5
3.3
1330
15.1
286
293
167
< 0.1
492
15.405
0.0083
0.9
GWA-58BRU
Deep
5.9
0.3
< 50
< 0.025
< 0.5
11.7
3140
5.0
720
274
260
0.1
507
1.769
0.0006
< 0.3
GWA-59D
Deep
5.5
0.7
597
0.166
1.2
118
1210
7.4
9850
200
187
0.3
379
1.933
0.0001
0.4
GWA-63BRU
Deep
6.6
0.4
115
< 0.025
1.6
2.3
643
10.3
390
91
8
< 0.1
153
0.558
0.0002
0.3
MW-08D
Deep
6.0
< 0.1
130
0.034
< 0.5
4.8
35460
6.7
5356
106
52
< 0.1
212
4.600
< 0.0005
< 0.3
MW-10D
Deep
5.1
< 0.1
153
0.120
0.9
2.0
193
1 2.6
92
51
16
0.1
69
0.858
-
0.3
MW-11DA
Deep
6.9
0.5
79
0.048
2.2
51.0
5012
9.4
252
145
38
< 0.1
327
2.833
0.3
CCR-03BR
Bedrock
6.1
0.5
12
-
3.7
0.8
-
2.9
-
-
7
< 0.1
110
1.124
-
-
CCR-08BR
Bedrock
5.4
0.2
901
< 0.025
1.2
4.7
541
1.4
2265
306
65
0.4
243
1.332
< 0.0005
< 0.3
CCR-12BR
Bedrock
6.3
0.3
38
< 0.025
1.7
0.6
1001
6.4
278
115
17
< 0.1
179
0.725
< 0.0005
< 0.3
GWA-20BR
Bedrock
8.3
0.7
258
0.027
< 0.5
0.3
8625
27.7
489
524
82
< 0.1
283
3.673
0.0002
< 0.3
GWA-27BR
Bedrock
6.5
0.3
258
0.029
1.4
0.1
997
19.0
29
206
5
< 0.1
1 198
1.255
0.0019
< 0.3
GWA-28BR
Bedrock
6.6
0.1
< 50
0.031
0.4
0.4
5662
5.3
83
80
7
< 0.1
119
-
-
< 0.3
GWA-57BR
Bedrock
7.2
0.1
231
< 0.025
2.6
0.6
305
3.2
965
199
64
< 0.1
324
5.715
0.0009
0.6
GWA-58BR
Bedrock
6.7
< 0.1
366
< 0.025
0.6
0.3
19350
11.0
1034
241
124
< 0.1
342
10.370
0.0004
< 0.3
GWA-59BR
Bedrock
5.8
0.2
593
< 0.025
0.7
2.1
4760
15.9
922
304
144
< 0.1
366
3.221
0.0001
< 0.3
GWA-64BRL
Bedrock
7.8
0.6
236
< 0.025
< 0.5
0.1
5675
43.5
576
436
21
< 0.1
348
3.220
0.0011
< 0.3
GWA-65BR
Bedrock
10.9
-
381
-
-
-
-
-
-
-
GWA-65BRL
Bedrock
12.8
-
83
-
-
-
-
-
-
-
GWA-66BRL
Bedrock
7.5
0.1
403
< 0.025
< 0.5
0.2
1480
28.8
299
395
17
< 0.1
292
7.135
0.0001
< 0.3
MW-11BRL
Bedrock
10.8
-
38
-
-
-
-
-
-
-
-
-
-
-
-
-
MW-11BR0
Bedrock
6.6
< 0.1
108
< 0.025
0.9
0.3
11700
6.5
1497
129
8
< 0.1
279
4.270
-
0.3
Near or Beyond Compliance Boundary
Downgradient of the Ash Basin
AS-07S
Ash Pore Water
7.2
83.7
1447
< 0.025
1.6
3.5
14176
85.9
12196
2828
497
1.3
1078
0.650
0.0051
1.8
AS-08S
Ash Pore Water
6.7
58.2
147
0.067
0.7
2.4
4414
6.4
2923
1318
28
0.2
247
-
-
0.5
AS-01SB
Shallow
4.3
6.1
1596
0.158
1.4
14.5
222
8.3
913
113
273
0.6
537
-
0.0011
< 0.3
AS-02S
Shallow
4.5
5.6
1003
0.609
1.6
16.8
< 50
2.4
9650
202
315
0.4
594
0.823
< 0.0005
< 0.3
AS-04S
Shallow
5.9
0.3
< 50
0.255
14.8
2.0
336
3.4
107
45
3
0.1
76
-
-
0.5
AS-05S
Shallow
5.3
0.3
< 50
0.057
1.0
0.2
215
2.9
19
7
1 < 1
< 0.1
28
-
< 0.0005
< 0.3
AS-06S
Shallow
5.4
< 0.1
< 50
0.150
2.5
0.3
219
1.7
100
12
< 1
< 0.1
33
0.474
-
< 0.3
AS-07I
Shallow
5.5
3.9
645
0.029
< 0.5
15.5
3913
4.9
6477
177
209
0.7
447
< 1.27
0.0002
< 0.3
CLMW-02
Shallow
4.1
1.1
538
0.105
0.8
18.5
88
5.6
1530
92
226
0.4
451
-
-
< 0.3
CLMW-03S
Shallow
4.2
3.9
911
0.091
0.7
37.1
127
9.3
3425
36
253
0.3
498
< 0.833
< 0.0005
0.4
CLP-01
Shallow
5.2
0.3
1 204
0.110
0.6
2.2
1 326
-
101
36
14
1 0.2
58
-
-
0.5
CLP-02
Shallow
5.7
0.1
47
< 0.025
5.9
2.5
368
123
27
18
< 0.1
70
-
-
0.3
GWA-21S
Shallow
9.4
10.4
158
0.453
1.5
0.6
72
3.0
23
204
96
0.3
259
0.507
0.0006
6.2
GWA-22S
Shallow
5.5
0.1
264
0.032
1.3
1.6
468
1.2
43
67
3
< 0.1
103
0.797
< 0.0005
1.1
GWA-33S
Shallow
4.9
0.2
< 50
0.030
1.1
14.6
6566
6.2
546
142
97
< 0.1
179
-
0.0000
0.4
GWA-54S
Shallow
4.9
< 0.1
75
0.044
1.0
6.9
137
2.8
219
21
< 1
0.2
58
1.219
< 0.0005
< 0.3
MW-23S
Shallow
4.9
0.1
< 50
2.360
3.0
1.1
150
2.2
64
120
121
0.1
219
-
-
< 0.3
AS-01D
Deep
5.5
0.1
672
0.444
2.1
0.4
157
2.5
291
186
56
0.3
167
-
< 0.0005
0.3
AS-02D
Deep
7.3
1.3
343
0.072
1.5
0.5
286
28.5
471
533
217
< 0.1
463
1.367
< 0.0005
0.7
AS-03BRU
Deep
5.2
< 0.1
< 50
< 0.025
0.9
0.1
229
1.8
13
19
< 1
< 0.1
36
-
-
< 0.3
AS-04D
Deep
5.4
0.1
< 50
0.333
1.3
0.7
107
6.2
39
29
1
< 0.1
62
0.710
-
0.4
AS-05BRU
Deep
5.8
0.2
< 50
0.068
1.8
0.2
271
0.8
12
22
< 1
< 0.1
41
-
< 0.0005
0.3
AS-06D
Deep
5.6
< 0.1
< 50
1 0.068
1 0.9
1 0.2
126
0.9
11
29
< 1
< 0.1
s0
0.747
< 0.3
Rev. 1
Page 3 of 4
23 April 2020

TABLE 6-5
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019
ACTIVE ASH BASIN
CORRECTIVE ACTIVE PLAN UPDATE
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC
Analytical Parameter
pH
Arsenic
Boron
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Strontium
Sulfate
Thallium
Total
Dissolved
Solids
Total Radium
Total Uranium
Vanadium
Reporting Units
S.U.
lrg/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
mg/L
Ng/L
mg/L
pCi/L
Ng/mL
Ng/L
15A NCAC 02L Standard
6.5 - 8.5
10
700
10
10
1*
300
NE
50
NE
250
0.2*
500
NE
NE
0.3*
2017 Background Threshold Values (Shallow Flow Zone)'
4.4 - 6.1
1
50
0.5
4
11
684
NE
169
37
1
0.1
75
3
0.0005
1
2019 Background Threshold Values (Shallow Flow Zone)Z
4.0 - 6.0
0.2
50
4
26
21
1700
3
969
34
4
0.2
57
2
0.0005
1
2019 Background Dataset Range (Shallow Flow Zone )2
3.3 - 6.1
<0.1 - 0.73
<50
<0.025 - 4.8
<0.5 - 26.2
0.16 - 22.9
<50 - 5750
<0.5 - 4.6
6.7 - 1000
6.8 - 103
<1 - 5.5
<0.1 - 0.3
<25 - 10700
0.0976 - 1.961
<0.0002 - <0.0005
<0.3 - 1.9
2017 Background Threshold Values (Deep Flow Zone)'
4.8 - 6.1
1
50
0.2
2
5
515
NE
78
56
10
0.1
71
2
0.0005
1
2019 Background Threshold Values (Deep Flow Zone)2
4.9 - 7.2
2
50
0.6
2
5
1840
12
260
69
15
0.2
107
2
0.0005
11
2019 Background Dataset Range (Deep Flow Zone)Z
3.8 - 7.3
<0.1 - 2
<50 - 150
<0.025 - 1.2
<0.5 - 9.9
<0.1 - 6.1
<50 - 3200
1.5 - 13.4
5.2 - 408
6.3 - 70.5
<1 - 18.5
<0.1 - <0.2
<25 - 407
0.017 - 2.323
<0.0005
<0.3 - 12.2
2017 Background Threshold Values (Bedrock Flow Zone)'
5.4 - 7.4
1
50
0.1
4
1
6220
NE
89
107
15
0.2
120
3
0.0005
0.4
2019 Background Threshold Values (Bedrock Flow Zone) Z
4.5 - 7.5
1
50
0.7
3
2
7680
11
113
93
17
0.2
120
3
0.0005
1
2019 Background Dataset Range (Bedrock Flow Zone )2
4.8 - 7.6
<0.1 - 1.2
<50 - 83
<0.025 - 0.8
<0.5 - 10.5
<0.1 - 2.6
<50 - 11000
1.1 - 7.3
5 - 134
16.6 - 116
1 <1 - 17.6
<0.1 - 0.5
<25 - 330
0 - 3.46
<0.0005
<0.3 - 1.5
Sample ID I Flow Zone
Mean, Geomean, or Median Result3
Downgradient of the Ash Basin (Continued)
AS-07D
Deep
5.5
0.2
836
0.266
1.5
0.3
122
7.7
1950
259
129
0.1
305
-
-
< 0.3
AS-08D
Deep
6.1
0.5
798
< 0.025
2.0
8.2
4310
3.8
4968
280
185
< 0.1
429
-
-
< 0.3
AS-09D
Deep
5.9
0.4
138
0.107
4.2
30.8
265
1.6
470
34
4
0.1
73
< 0.866
< 0.0002
0.5
CLMW-03D
Deep
5.2
0.2
912
0.135
1.1
0.2
283
4.2
43
295
280
< 0.1
529
1.351
< 0.0005
0.3
GWA-21BRU
Deep
6.5
< 0.1
156
< 0.025
< 0.5
1.0
516
1.9
168
174
23
0.1
200
1.184
< 0.0005
< 0.3
GWA-22BRU
Deep
8.0
0.3
< 50
0.069
0.7
< 0.1
174
1 11.7
11
128
4
< 0.1
146
0.536
-
0.8
GWA-33D
Deep
6.1
0.2
< 50
0.044
0.4
0.4
709
24.2
89
169
106
< 0.1
278
-
0.4
GWA-47D
Deep
5.3
0.1
333
0.064
0.9
1.1
161
2.8
140
70
< 1
0.1
88
1.063
-
0.6
GWA-54D
Deep
7.3
0.5
74
0.047
1.0
0.1
851
4.9
210
230
48
< 0.1
292
0.552
< 0.0005
< 0.3
GWA-62BRU
Deep
6.5
0.6
72
0.361
2.1
3.8
959
36.0
573
160
146
< 0.1
353
< 1.4
0.0003
0.7
MW-20D
Deep
6.5
0.2
442
< 0.025
1.5
1.1
3723
2.8
282
148
15
< 0.1
189
< 1.53
-
0.4
MW-23D
Deep
6.9
0.8
< 50
0.026
0.8
0.7
1028
19.6
632
323
335
< 0.1
649
-
-
< 0.3
AS-02BR
Bedrock
8.0
2.0
418
0.050
1.3
0.1
176
12.4
363
222
97
< 0.1
289
0.0016
< 0.3
AS-05BR
Bedrock
6.9
0.7
< 50
0.928
1.8
< 0.1
99
6.1
9
47
7
< 0.1
79
-
0.0001
1.6
AS-06BRA
Bedrock
6.6
0.3
< 50
0.044
0.8
0.1
84
2.8
26
60
4
< 0.1
96
0.955
-
0.8
AS-07BRB
Bedrock
7.6
1.6
72
0.127
2.4
0.3
148
3.8
24
78
40
< 0.1
166
0.601
0.0040
0.8
AS-07BRL
Bedrock
12.0
-
< 50
-
-
-
-
-
-
-
-
-
-
-
-
-
AS-08BR
Bedrock
7.3
0.6
43
0.310
1.7
0.2
63
1.3
44
133
71
< 0.1
268
0.760
0.0044
1.0
AS-09BR
Bedrock
8.1
6.5
< 50
0.057
1.8
0.2
202
4.8
40
49
7
< 0.1
124
< 0.464
0.0035
0.7
GWA-21BR
Bedrock
7.2
< 0.1
133
< 0.025
< 0.5
0.4
3630
7.0
410
271
< 1
< 0.1
237
6.116
< 0.0005
< 0.3
GWA-21BRL
Bedrock
7.2
0.4
213
< 0.025
< 0.5
0.2
3520
9.8
662
267
2
< 0.1
268
3.440
< 0.0002
0.3
GWA-33BR
Bedrock
8.2
< 0.1
160
< 0.025
< 0.5
< 0.1
1304
31.1
334
204
79
< 0.1
282
-
-
< 0.3
GWA-54BRO
Bedrock
6.6
0.9
92
0.042
4.1
0.2
965
13.9
54
165
109
< 0.1
310
0.878
0.0021
< 0.3
GWA-62BR
Bedrock
9.2
-
307
-
-
-
-
-
-
-
-
-
-
-
-
-
MW-02DA
Bedrock
6.6
0.8
< 50
0.066
1.4
1.6
1609
21.7
801
140
21
< 0.1
143
-
< 0.3
MW-20DR
Bedrock
7.1
< 0.1
175
< 0.025
< 0.5
< 0.1
301
8.3
577
344
< 1
< 0.1
283
1.247
< 0.3
MW-23DR
Bedrock
7.1
0.3
< 50
< 0.025
< 0.5
< 0.1
992
7.3
53
106
25
< 0.1
152
-
< 0.3
MW-25DR
Bedrock
6.4
1 0.6
< 50
0.196
0.6
1.0
53
2.1
10
51
2
< 0.1
70
0.3
Notes:
' - Background threshold values were calculated using data from background groundwater samples collected June 2015 to September 2017.
z - Background threshold values were calculated using data from background groundwater samples collected March 2011 to December 2018.
3 - Statistical mean, geomean, or median calculated from data ranging from January 2018 to June 2019. Ash pore water results are not compared to groundwater standards or criteria.
Mean or geomean results were used based on the central tendency of the data set.
For wells with datasets containing fewer than four valid results, the most recent valid sample data was used.
Means were calculated for wells with four or more valid sample results. Sample results were excluded from calculations:
1) if turbidity >10 NTU (for COIs other than boron)
2) for unusable data (RO qualified)
3) if a result was non -detect at a reporting limit (RL) greater than the normal laboratory RL
Bold text - Constituent concentration exceeds applicable comparison criteria.
0 - bold highlighted concentration indicates value is greater than the 15A NCAC 02L .0202 Standard or the IMAC. (Effective date for 15A NCAC 02L .0202 Standard and IMAC is April 1, 2013)
- bold highlighted concentration indicates value is greater than greatest background threshold value where there is no regulatory standard, or background threshold values are greater than regulatory standard
0 - highlighted concentration indicates value is either within range of background threshold values for constituents where there is no regulatory standard/background threshold values are greater than regulatory standard, or within range of background threshold value and the regulatory standard
* - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013.
< - concentration not detected at or above the adjusted reportinq limit.
- - value not available
NE - not established
mq/L - milligrams per liter
pCi/L - picocuries per liter
uq/L - micrograms per liter
S.U. standard unit
Prepared by: TJG Checked by: TAW
Rev. 1
23 April 2020
Page 4 of 4

TABLE 6-6
COI MANAGEMENT MATRIX
ACTIVE ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC
tlotm:
- aefereaa Cn-m
- e�meaa:pppara map:m
- e�meaa spppara e.clpsioa
- pis,-lin renecta-001 usud-1-m-308 CSA Update, — the addld-ofIft-
- Background threshold values were calculated using data — background groundwater samples colleced June 2015 to April 2017
- Updated background threshold values are In the thlyd column and were calculated using data from background groundwater samples collected ORober 2010 to December 2018 and sumbmitted to NCDEQ June 2019
- A-. c mean was used for COI with concentration range less than or equal to one order of mag—de. Geometric mean was used for C01 with conce—d- range greater than one oMer of magnitude.
' - The exceedance ratio Is the ratio of the mean constituent concentration divided by the comparative criterion.
- Assignment of conservative, non-conservatve, Dr variable behavior Is based on geochemical modeling results.
C01 a constituent of interest
CSA - Comprehensive SiW Assessment
iMAC -interim maximum allowable concentration
pyL-mac a e e ker
mg/L- ga spe kter
- N. Applicable
Prepared by: = Checked by: S
Rev. 1
23 April 2020

TABLE 6-9
WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY
CORRECTIVE ACTIVE PLAN UPDATE
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC
Analytical Parameter
pH
Turbidity
Arsenic
Boron
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Strontium
Sulfate
Thallium
Total
Dissolved
Solids
Total Radium
Total Uranium
Vanadium
Impacted by
coal ash?
Alternative Water Supplied?
Water Type
Reporting Units
S.U.
NTUs
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
mg/L
pCi/L
pg/mL
pg/L
15A NCAC 02L Standard
6.5 - 8.5
NE
10
700
10
10
1*
300
NE
50
NE
250
0.2*
500
NE
NE
0.3*
2017 Background Values (Bedrock Flow Zone)'
5.4-7.4
NE
1
50
0.1
4
1
6220
NE
89
107
15
0.2
120
3
0.0005
0.4
2019 Background Values (Bedrock Flow Zone)z
4.5 - 7.5
NE
1
50
0.7
3
2
7680
11
113
93
17
0.2
120
3
0.0005
1
Cliffside Background Dataset Range
(Bedrock Flow Zone)z
4.8-7.6
NE
<0.1 - 1.2
<50 - 83
<0.025 - 0.8
<0.5 - 10.5
<0.1 - 2.6
<50 - 11000
1.1 - 7.3
5 - 134
16.6 - 116
<1 - 17.6
<0.1 - 0.5
<25 - 330
0 - 3.46
<0.0005
<0.3 - 1.5
Piedmont Background Value Range
(Bedrock Flow Zone)
4.5-9.0
NE
1.0 - 6.0
49.1 - 50
0.03 - 8
2.8 - 11
0.2 - 18
147 - 7680
NE
7 - 1773
93 - 2272
2 - 130
0.1 - 0.2
120 - 675
1.0 - 6.0
0.0005 - 0.006
0.38 - 26
Sample ID
Sample Date
Analytical
Results
Cl Well 2
02/04/2015
7.5
<1
2.6
<25
<20
<5
<5
540
NA
7.6
26
13
NA
42
NA
NA
<5
No
Yes -municipal water supply connection
Calcium Bicarbonate
Cl Well 2
05/27/2015
6.2
1.4
<0.5
<5
<0.6
3.2
<0.5
218
NA
13.1
50.1
9
NA
53
NA
NA
<1
No
Yes -municipal water supply connection
Calcium Bicarbonate
Cl Well 3
02/04/2015
6.7
<1
<1
<25
<20
<5
<5
210
NA
11
48
8.5
NA
60
NA
NA
<5
No
Yes -municipal water supply connection
Calcium Bicarbonate
C10
02/04/2015
8.0
<1
1.6
<25
<20
<5
<5
650
NA
42
39
8.1
NA
54
NA
NA
<5
No
Yes -municipal water supply connection
Calcium Bicarbonate
C10
05/27/2015
7.0
2.2
1.3
<5
<0.6
2.3
<0.5
<50
NA
49.6
38.2
7.6
NA
79
NA
NA
<1
No
Yes -municipal water supply connection
Calcium Bicarbonate
C-1001: C2801 Riverfront
05/07/2014
NM
NM
<2
<50
NA
<10
NA
78
NA
NA
33
2
NA
NA
NA
NA
NA
No
Yes -municipal water supply connection
Calcium Bicarbonate
C-1001: C2801 Riverfront
10/18/2016
6.4
2.2
0.44
<25
<0.03
<0.5
0.18
289
NA
47.3
36.3
5.9
NA
62
NA
NA
<0.3
No
Yes -municipal water supply connection
ND
C-1002: 2901 Fox Place
10/18/2016
6.2
6.4
0.19
<25
<0.03
<0.5
0.46
2970
NA
27.6
30.1
15.3
NA
63
NA
NA
<0.3
No
Yes -municipal water supply connection
ND
C-1003
10/18/2016
7.6
<1
0.98
<25
<0.03
<0.5
<0.1
<50
NA
8.3
65.1
6.1
NA
108
NA
NA
<0.3
No
Yes -municipal water supply connection
Calcium Bicarbonate
C-1004: C2800 Riverfront
05/07/2014
NM
NM
<2
<50
NA
<10
NA
<50
NA
NA
20
NA
NA
NA
NA
NA
NA
No
Yes -municipal water supply connection
ND
C-1004: C2800 Riverfront
10/18/2016
4.9
<1
<0.1
<25
0.63
1.2
<0.1
<50
NA
1.5
20.4
<2
NA
27
NA
NA
<0.3
No
Yes -municipal water supply connection
ND
C-1005 S1
10/17/2016
6.8
1.1
0.3
<25
<0.03
<0.5
0.15
311
NA
23.5
41.1
2.9
NA
108
NA
NA
0.64
No
Yes -municipal water supply connection
Calcium Bicarbonate
C-1005 S2
10/17/2016
6.1
5.2
0.17
<25
0.32
0.79
<0.1
161
NA
5.4
20.5
<2
NA
36
NA
NA
1.1
No
Yes -municipal water supply connection
Calcium Bicarbonate
C-1005 S4
10/17/2016
7.0
10.8
0.73
<25
0.17
<0.5
0.41
1670
NA
110
26.4
2.4
NA
43
NA
NA
0.32
No
Yes -municipal water supply connection
ND
C-1005 S5
10/18/2016
6.9
4.1
<0.1
82
<0.15
<0.5
0.41
483
NA
56.9
26.4
<2
NA
34
NA
NA
0.41
No
Yes -municipal water supply connection
Calcium Sulfate
C-1005 W1
10/17/2016
5.3
<1
<0.1
<25
0.13
<0.5
<0.1
<50
NA
1.5
15.6
2.3
NA
31
NA
NA
<0.3
No
Yes -municipal water supply connection
Calcium Bicarbonate
C-1005 W2
10/17/2016
6.1
<1
0.56
<25
<0.03
<0.5
0.41
392
NA
59.1
54
5.8
NA
65
NA
NA
1.1
No
Yes -municipal water supply connection
Calcium Bicarbonate
C-1005 W3
10/17/2016
7.0
<1
<0.1
<25
<0.03
<0.5
<0.1
754
NA
34.9
54.5
5.9
NA
92
NA
NA
<0.3
No
Yes -municipal water supply connection
Calcium Bicarbonate
C-1006: 2910 Fox Place
11/03/2016
7.3
<1
0.28
<25
0.026
<0.5
<0.1
81.6
NA
14.3
50.9
10.3
NA
104
NA
NA
<0.3
No
Yes -municipal water supply connection
Calcium Bicarbonate
C-1007: 433 Dysart Place
11/03/2016
7.4
<1
0.23
<25
<0.12
<0.5
<0.1
455
NA
166
59.3
12.7
NA
98
NA
NA
<0.3
No
Not eligible, outside 1/2 mile radius
Calcium Bicarbonate
C-1007: 433 Dysart Place
03/31/2017
7.4
1.2
0.25
<25
<0.025
0.88
<0.1
453
NA
173
61.5
12
<0.1
115
NA
NA
<0.3
No
Not eligible, outside 1/2 mile radius
Calcium Bicarbonate
C-1008
11/03/2016
5.2
<1
<0.1
<25
<0.025
<0.5
0.65
<50
NA
12.3
18.4
<2
NA
<25
NA
NA
<0.3
No
Not eligible, outside 1/2 mile radius
ND
C105 Downriver
04/09/2014
5.4
1
<2
<50
NA
<10
NA
320
NA
NA
NA
6.8
NA
99
NA
NA
NA
No
Yes -municipal water supply connection
ND
C11
05/01/2015
6.6
4.2
<0.5
<5
0.096
<0.5
<0.5
<50
NA
3
39.3
<2
NA
<25
NA
NA
<1
No
Yes -municipal water supply connection
Calcium Sulfate
C15
02/04/2015
8.0
2.3
1
<25
<20
<5
<5
2200
NA
230
140
11
NA
190
NA
NA
<5
No
Yes -municipal water supply connection
Calcium Bicarbonate
C16
02/04/2015
6.6
4.9
<1
<25
<20
<5
<5
380
NA
<5
30
2.6
NA
38
NA
NA
<5
No
Yes -municipal water supply connection
ND
C17
02/04/2015
7.6
11
<25
3200
NA
630
81
1.2
NA
330
NA
<5
No
Yes -municipal water supply connection
ND
C19
02/04/2015
7.7
2.4
<1
<25
<20
<5
<5
240
NA
<5
33
2.5
NA
25
NA
NA
<5
No
Yes -municipal water supply connection
ND
C23
05/27/2015
6.9
1.1
<0.5
<5
0.83
1.5
<0.5
110
NA
3.1
15.7
<2
NA
44
NA
NA
<1
No
Yes -municipal water supply connection
Calcium Bicarbonate
C24
05/27/2015
6.4
<1
<0.5
<5
<0.6
0.91
1.9
<50
NA
40.3
71.4
2.2
NA
106
NA
NA
<1
No
Yes -municipal water supply connection
ND
C24
08/18/2015
6.3
1
<0.5
<50
0.44
<5
<0.5
<50
NA
NA
60.8
2
NA
101
NA
NA
<1
No
Yes -municipal water supply connection
ND
C24-1
05/27/2015
6.7
<1
1 <0.5
<5
0.63
0.88
<0.5
<50
1 NA
2.7
58.2
1 2.9
NA
90
NA
NA
<1
No
Yes -municipal water supply connection
Calcium Bicarbonate
C25
05/27/2015
6.5
3.9
<0.5
<5
<0.6
14.1
<0.5
540
NA
3.6
28
5.6
NA
53
NA
NA
<1
No
Yes -municipal water supply connection
Calcium Bicarbonate
C25
08/17/2015
6.4
1.2
<0.5
<50
0.11
<0.5
<0.5
<50
NA
NA
28.2
4.8
NA
54
NA
NA
<1
No
Yes -municipal water supply connection
Calcium Bicarbonate
C26
05/27/2015
6.1
<1
<0.5
5.6
<0.6
0.81
<0.5
188
NA
2.7
26
3.5
NA
41
NA
NA
<1
No
Not eligible -outside 1/2 mile radius
ND
C26
08/17/2015
6.2
1.5
<0.5
<50
0.15
<0.5
<0.5
52.5
NA
NA
27.1
3
NA
61
NA
NA
<1
No
Not eligible -outside 1/2 mile radius
ND
C2968 Riverfront
04/09/2014
NM
5.6
NA
<50
NA
<10
NA
790
NA
33
NA
2
NA
101
NA
NA
NA
No
Yes -municipal water supply connection
ND
C3
02/04/2015
7.2
<1
<1
<25
<20
<5
<5
360
NA
20
51
4.8
NA
48
NA
NA
<5
No
Yes -municipal water supply connection
Calcium Bicarbonate
C3
05/27/2015
6.5
<1
<0.5
5
<0.6
0.56
1.2
<50
NA
25.5
44
4.4
NA
36
NA
NA
<1
No
Yes -municipal water supply connection
Calcium Bicarbonate
C4 Well 2
02/04/2015
7.0
1.2
<10
<25
<20
<50
<50
290
NA
<50
<100
2.3
NA
<10
NA
NA
<50
No
Not eligible-business/church/school
ND
C4 Well 3
02/04/2015
7.0
210
27
<5
3200
NA
11
24
NA
160
NA
11
No
Not eligible-business/church/school
ND
C5
05/01/2015
6.6
<1
<0.5
6.2
2.2
2.2
<0.5
<50
NA
1
20.2
2.3
NA
80
NA
NA
<1
No
Yes -municipal water supply connection
ND
C7
05/01/2015
7.6
<1
1.3
<5
<0.03
<0.5
<0.5
<50
NA
7.9
60.6
6.5
NA
94
NA
NA
<1
No
Yes -municipal water supply connection
ND
C8
05/01/2015
6.2
<1
<0.5
<5
0.74
0.86
0.72
57.3
NA
11
16
<2
NA
59
NA
NA
<1
No
Yes -municipal water supply connection
ND
C8 Spring
05/01/2015
5.6
34.8
<0.5
6.5
<0.03
2.2
1.6
<50
NA
16.8
14.9
5.9
NA
45
NA
NA
3
No
Yes -municipal water supply connection
ND
C9A
05/01/2015
5.7
<1
<0.5
6.2
0.01
<0.5
<0.5
<50
NA
2.3
14.1
2.6
NA
32
NA
NA
<1
No
Yes -municipal water supply connection
IND
C9B
05/01/2015
7.1
<1
<0.5
<5
<0.03
<0.5
<0.5
749
NA
32.4
48.9
6.2
NA
97
NA
NA
<1
No
Yes -municipal water supply connection
IND
repared by: TJG Checked by: SAS
NNotg,
- Background threshold values were calculated using data from background groundwater samples collected June 2015 to September 2017. mg/L - milligrams per liter
- Background threshold values were calculated using data from background groundwater samples collected March 2011 to December 2018. pCi/L - picocuries per liter
Turbidity of Sample 2 10 NTUs pg/L - micrograms per liter
Bold text - Constituent concentration exceeds applicable comparison criteria. S.U. standard unit
* - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013.
* - concentration not detected at or above the adjusted reporting limit.
NA - not analyzed
ND - water type of sample not determined due to charge balance >10 or ­10
NM - not measured
NE - not established
NTU - Nephelometric Turbidity Unit
Rev. 1
23 April 2020

TABLE 6-20
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019
FORMER UNITS 1-4 ASH BASIN
CORRECTIVE ACTIVE PLAN UPDATE
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC
Analytical Parameter
pH
Arsenic
Boron
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Strontium
Sulfate
Thallium
Total
Dissolved
Solids
Total Radium
Total Uranium
Vanadium
Reporting Units
S.U.
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
mg/L
Ng/L
mg/L
pCi/L
Ng/mL
Ng/L
15A NCAC 02L Standard
6.5 - 8.5
10
700
10
10
1*
300
NE
50
NE
250
0.2*
500
NE
NE
0.3*
2017 Background Threshold Values (Shallow Flow Zone)'
4.4 - 6.1
1
50
0.5
4
it
684
NE
169
37
1
0.1
75
3
0.0005
1
2019 Background Threshold Values (Shallow Flow Zone)2
4.0 - 6.0
0.2
50
4
26
21
1700
3
969
34
4
0.2
57
2
0.0005
1
2019 Background Dataset Range (Shallow Flow Zone)2
3.3 - 6.1
<0.1 - 0.73
<50
<0.025 - 4.8
<0.5 - 26.2
0.16 - 22.9
<50 - 5750
<0.5 - 4.6
6.7 - 1000
6.8 - 103
<1 - 5.5
<0.1 - 0.3
<25 - 10700
0.0976 - 1.961
<0.0002 - <0.0005
<0.3 - 1.9
2017 Background Threshold Values (Deep Flow Zone)'
4.8 - 6.1
1
50
0.2
2
5
515
NE
78
56
10
0.1
71
2
0.0005
1
2019 Background Threshold Values (Deep Flow Zone)2
4.9 - 7.2
2
50
0.6
2
5
1840
12
260
69
15
0.2
107
2
0.0005
it
2019 Background Dataset Range (Deep Flow Zone)2
3.8 - 7.3
<0.1 - 2
<50 - 150
<0.025 - 1.2
<0.5 - 9.9
<0.1 - 6.1
<50 - 3200
1.5 - 13.4
5.2 - 408
6.3 - 70.5
<1 - 18.5
<0.1 - <0.2
<25 - 407
0.017 - 2.323
<0.0005
<0.3 - 12.2
2017 Background Threshold Values (Bedrock Flow Zone)'
5.4 - 7.4
1
50
0.1
4
1
6220
NE
1 89
1 107
1 15
1 0.2
120
1 3
1 0.0005
1 0.4
2019 Background Threshold Values (Bedrock Flow Zone)2
4.5 - 7.5
1
50
0.7
3
2
7680
1 it
113
1 93
17
0.2
120
3
0.0005
1
2019 Background Dataset Range (Bedrock Flow Zone)2
4.8 - 7.6
<0.1 - 1.2
<50 - 83
<0.025 - 0.8
<0.5 - 10.5
<0.1 - 2.6
<50 - 11000
1.1 - 7.3
5 - 134
1 16.6 - 116
<1 - 17.6
<0.1 - 0.5
<25 - 330
0 - 3.46
<0.0005
<0.3 - 1.5
Sample ID
Flow Zone
Mean, Geomean, or Median Result3
Background Locations
GWA-30S
Shallow
5.7
0.1
< 50
0.041
1.3
5.0
264
1.1
269
24
< 1
0.2
43
-
-
< 0.3
MW-30S
Shallow
5.3
0.1
< 50
3.12
3.0
0.4
159
1.2
8
10
< 1
< 0.1
33
0.490
< 0.0005
< 0.3
MW-32S
Shallow
5.0
0.1
< 50
0.177
0.6
1.1
73
2.5
37
27
< 1
0.1
59
1.107
< 0.0005
< 0.3
MW-30D
Deep
8.3
1.6
< 50
0.076
< 0.5
< 0.1
53
11.1
8
61
16
< 0.1
107
1.333
0.0003
10.0
MW-30DA
Deep
6.7
0.2
< 50
< 0.025
0.6
0.8
241
10.2
219
65
10
< 0.1
116
0.536
< 0.0005
0.3
MW-32D
Deep
5.9
0.1
< 50
0.034
< 0.5
1.8
< 50
2.8
it
40
7
< 0.1
73
0.533
< 0.0005
< 0.3
GWA-30BR
Bedrock
6.3
0.2
< 50
< 0.025
0.7
< 0.1
7198
3.6
70
52
14
< 0.1
90
-
-
0.2
MW-32BR
Bedrock
7.0
0.1
< 50
< 0.025
0.8
< 0.1
5305
6.1
1 33
57
16
< 0.1
103
0.386
< 0.0005
< 0.3
Between Waste Boundary and Compliance Boundary
Upgradient of the Ash Basin
GWA-14S
Shallow
6.0
0.2
63
1.300
2.1
0.4
392
-
19
95
85
0.1
217
-
-
1.1
GWA-14D
Deep
5.9
0.1
101
0.986
1.3
0.2
79
0.7
6
228
186
< 0.1
413
0.5
GWA-13BR
Bedrock
6.5
1 0.2
84
< 0.025
1.0
< 0.1
5674
17.7
249
157
91
< 0.1
321
0.4
GWA-14BR
Bedrock
8.5
1.3
< 50
0.162
1.4
0.2
227
17.9
52
123
54
< 0.1
184
-
1.4
Downgradient of the Ash Basin
GWA-10S
Shallow
5.2
0.6
1 97
1 0.043
1 < 0.5
1 5.9
1 182
1 5.0
1 1038
1 227
1 131
1 0.2
1 259
1 1.347
< 0.3
GWA-12S
Shallow
5.6
0.1
1 < 50
1 0.042
1.0
0.2
117
0.6
1 6
1 18
1 13
< 0.1
86
-
< 0.3
GWA-10D
Deep
5.9
< 0.1
< 50
0.780
1.1
3.1
< 50
6.2
174
139
24
< 0.1
125
< 0.573
0.4
GWA-12BRU
Deep
6.0
0.1
1 < 50
< 0.025
< 0.5
2.3
503
2.7
43
49
1 9
< 0.1
101
< 0.3
Near Compliance Boundary
Downgradient of the Ash Basin
CCR-IB-01S
Shallow
5.8
0.2
151
0.028
0.6
2.8
858
< 0.5
1706
395
79
< 0.1
196
< 1.14
< 0.3
CCR-IB-03S
Shallow
6.3
109
270
0.027
0.9
16.6
4740
15.7
2068
898
200
0.1
471
< 1.09
-
< 0.3
GWA-11S
Shallow
5.9
1.2
398
< 0.025
0.6
1.6
621
2.6
1970
554
105
< 0.1
299
0.456
< 0.0005
1.2
IB-06S
Shallow
5.5
0.1
590
0.028
1.5
18.3
606
3.3
7333
369
258
0.1
457
1.620
< 0.0005
< 0.3
IB-07S
Shallow
5.7
12.6
268
< 0.025
1.4
10.5
1613
10.0
1627
305
109
0.2
307
1.240
< 0.0005
0.5
CCR-IB-01D
Deep
5.8
0.2
< 50
0.027
0.7
0.3
3328
3.8
110
60
14
0.1
97
< 0.711
-
< 0.3
CCR-IB-03D
Deep
9.6
0.8
65
2.543
2.5
< 0.1
< 50
28.1
< 5
229
86
< 0.1
321
-
-
1.7
GWA-11BRU
Deep
6.5
0.3
350
0.120
0.7
0.7
421
16.2
740
285
103
< 0.1
319
2.947
< 0.0005
0.6
GWA-29D
Deep
5.7
< 0.1
< 50
0.167
0.9
0.3
150
1.6
9
35
8
< 0.1
66
1.368
< 0.0005
< 0.3
GWA-32D
Deep
6.0
0.1
< 50
0.097
< 0.5
0.1
124
0.6
10
11
2
< 0.1
27
-
0.0002
< 0.3
IB-06D
Deep
7.0
0.1
128
< 0.025
1.6
0.1
2090
12.2
289
209
51
< 0.1
253
4.930
0.0001
< 0.3
IB-07D
Deep
6.7
0.7
< 50
0.028
2.0
1.3
350
5.7
196
126
30
< 0.1
221
-
0.0002
0.5
CCR-IB-03BR
Bedrock
6.6
0.4
< 50
< 0.025
0.7
4.6
25750
21.6
9570
813
1395
< 0.1
2298
37.833
0.0002
0.4
GWA-11BR
Bedrock
7.5
1.3
207
< 0.025
< 0.5
0.8
46
7.2
84
299
67
< 0.1
322
1.980
0.0016
0.9
GWA-11BRL
Bedrock
8.3
< 50
-
-
-
-
-
-
-
-
GWA-29BRA
Bedrock
7.7
1.8
< 50
0.067
0.7
0.2
153
0.4
29
213
11
< 0.1
146
1.2
Notes:
' - Backqround threshold values were calculated usinq data from backqround qroundwater samples collected June 2015 to September 2017.
NE - not established
2 - Backqround threshold values were calculated usinq data from background qroundwater samples collected March 2011 to December 2018.
mg/L - milligrams per liter
3 - Statistical mean, qeomean, or median calculated from data ranqinq from January 2018 to June 2019. Ash pore water results are not compared to qroundwater standards or criteria.
pCi/L - picocuries per liter
Mean or geomean results were used based on the central tendency of the data set.
Ng/L - micrograms per liter
For wells with datasets containing fewer than four valid results, the most recent valid sample data was used.
S.U. standard unit
Means were calculated for wells with four or more valid sample results. sample results were excluded from calculations:
1) if turbidity >10 NTU (for COIs other than boron)
2) for unusable data (RO qualified)
3) if a result was non -detect at a reporting limit (RL) greater than the normal laboratory RL
Bold text - Constituent concentration exceeds applicable comparison criteria.
- bold highlighted concentration indicates value is greater than the 15A NCAC 02L .0202 Standard or the IMAC. (Effective date for 15A NCAC 02L .0202 Standard and IMAC is April 1, 2013)
0 - bold highlighted concentration indicates value is greater than greatest background threshold value where there is no regulatory standard, or background threshold values are greater than regulatory standard
0 - highlighted concentration indicates value is either within range of background threshold values for constituents where there is no regulatory standard/background threshold values are greater than regulatory standard, or within range of background threshold value and the regulatory standard
* - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013.
< - concentration not detected at or above the adjusted reporting limit.
- - value not available
Prepared by: TJG Checked by: TAW
Rev. 1
23 April 2020
Page 1 of 1

DUKE
TABLE 6-21
COX MANAGEMENT MATRIX
FORMER UNITS 1-4 ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
CLIFFSIDE STEAM STATION
ENERGY CAROLINAS, LLC, MOORESBORO, NC
`J sip
Lines of Evidence (LOE) - 02L Criterion
Gnuumou, Clifivid, St- Numbo-f-11.
Mean
Constituents Regulator, Z... st.tis=ly Station k Fiethroont I CbN`sJ,`lr`,rtMaN-r E—d Above Criterion tim-ndissather Monitoring Wall, With COX Concentration
11-i-al Background V.I.."a once C
Deltersal R11.0 Compliance Jones No., Co J Greauser Than Cturrinarati- Criteria
(2018 C&A, update) Criterion ma Ratio'
FlIv, Zone,) to.rdl Boundary
Flos, .... 2� 11111" Constituent Standards and Values - 02L Criterion
Rationale for Selection of COX, for Corrective Action Evaluation
(for constituents where oregreater then compared- c,itlari. in all flow zones and/or
multipleIt"$ of evidence support the, constituent occurrences are no, related to the
source are,, no correcti- .,I.. I. warranted)
Rationale - 02L Criterion
CCJ lit -Is
M.1thoo means �ra.tar than d21 standard ... --plance boundary and a,hiblits di—ab's plume (Figure 6-46)
tar than .11 standard no., compliance boundary
No m::n:
ggre
No m reater than 02L standard near compliance boundary
mom
.me nsgm,�rth,n02L�nd,M,h,�.�.rb,��g,,t,rth,nb,,kg��nd��l��i�m�pp,d,,,nindi,,t,rofpotenti,l,,hb,�inin,�ence
(Fi or, 647.)
No m::n::m �rth,n02L-nd�M,ho�.�,rb,,ng,,t,rth,nb,,kg,,nd�,l�.i�m�pp�d���nindic,torofpotnti�,��hb��inin,�ence
Illobabal 6-4 J
b"kg,,nd�,1,,i�m�pp�d���nindic,torofpot,nti,l��hb��ininl�ence
Nor, b m,�rth,n02LMnd��,ho�.�.rb.�ngm,t,rth,n.0
Ili be 6-47:)
Chromium ('ratill)
No mean: greater than background valu near compliance boundary
No bound:
a n o:L -nd:d nc:
comp
b
n m u h:n m n:� No mean ro 0 L-nd rd o ��:nc o nd rY
Chursonwon (Holoca-lount)
No meanogreadarthan backgboundvalue nearcompliance boundary
No means inesterthen trock­nd nine muncomphence boundary
�CCR-IB-1D �6D�
One mean groate r than background alue near com pliance bound,r-,, Isolated occu-1c, (Figure 6-491)
113
Multiple means greater than background value near comoliance boundary and ,hlbits drscarnable plume (Flour, 6-49b)
On, mean greater than background value near compliance boundary, Isolated occurrance (Figure 6-491)
Multiple means greater than background value near compliance, boundary and a,hlJ discarnable plume (Figure 6-51,)
Multhal, mean, greater than background value near compliance boundary and a,hlJ discarnable plume (Figure 6-51b)
On, mean greater than background value near compliance boundary, isolated occurrance (Figure 6-511)
One mean greater than 02L near compliance bounds,, Isolated occurre1c, (Figure
:tandan!
No mean greater than 02L standard near compliance boundary
One mean greater th:n - ""dar-cl near- compliance bround,,,, isolated occun,ance (Figure 6-53b)
Total libub-a-bilids
�mm
��o
�oaoo®
N mean, greater than 02L standard near coml boundary
No means greater than 02L standard near compliance boundary
One mean greater than 02L standIr-cl n- compliance boundary, isolated occu-ce (Figure 6-54)
illill 111111111111111 1111111111 1111111 Jill 11111 1 'Ili 11111 !J1111 1111
111 11111
Retionnis e - IMAC Criterion
®moo©®®��o
�000©
No mean, g-torthan background value near compliance boundary
No mean, greaterthan background value near compliance boundary
0000®
One mean gro,- than b,ckg,u,d �,lu, a,, compliance bmmdar-y, Isolated occuerce (Figure 6-48)
®��®®��o
m: tor M C comp��:nc: b N :n :h:n AC n comp c und rY
000©®
No means greaterthan 1- near compliance boundary
moo
®moo
0000One
mean grea- tharmackg,ou'd value near compliance bmmdar-,, Isolated occu-ma, (Figure 6-56,)
No eans greater than background value near compliance boundary
One mean grc.- than background �aluo a,, _Pliam,ab ... dar-y, Isolated occ-ance (Figure 6-56b)
. r Constituent Standards and Values - Background Criterion
Lines of Evidence (LOE) - Background Criterion
Rationale - Background Criterion
CCJ 113 6r, IJ
�0000®One
r gre
n b: kgground a boundd:,
n:
n:bb�:Pp�um Fi or
CCJ GWA--11J IJ
:h
Z'p :nd J
u: bou d::h h�b
m rog::� h:n :mp i Its
mereater than background value near compliance boundary, Isolated occurrance (Figure 6-50b)
Multiple Mean g ckgground v Fi:ur:::'::)
comp " b:.rd:N:�d::h'btsd':::�r
ur P�i:n
�:Pp�um
ck d r b d d hb' d :b :F or Multiple mo.r: ­: ro v: com i no , i its i m: 1
�:�h:r tb: �u: n::r
M,Itipi,m,,n,g,,trth,nb kg,und�,1,,n,,r,ompli,n,,b,und,�,nd,.hibi�di,m�,bi,pl,m,(Fig,m6-52c)
No mean, greater than background ,I,, near compliance boundary
GWA-11J IJ
-tal than b,,kqd value (Figure 6-55,) .
•
Non -Conservative
No means greator than background value near compliance boundary
1­-1 1,: 111 1hockel 1,: �A�
tbaJ C,1
lb-=oom-le'llb
-dull-
1.11
.... ..... . . ... .... r-k­rrl -1- 11, 11,1 rIUMn - o-d-1, -,Irl .11-In 0,- -. 1. .1-11 aad,mem a1 NCDEQ bbry 2019
nagre-
rr-1--
"I'll-en' sl. All.-rl
P.
.A Appi-lb sta=- lv
Rev. 1
23 April 2020

TABLE 6-31
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019
UNIT 5 INACTIVE ASH BASIN
CORRECTIVE ACTIVE PLAN UPDATE
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC
Analytical Parameter
pH
Arsenic
Boron
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Strontium
Sulfate
Thallium
Total
Dissolved
Solids
Total Radium
Total Uranium
Vanadium
Reporting Units
S.U.
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
mg/L
Ng/L
mg/L
pCi/L
Ng/mL
Ng/L
15A NCAC 02L Standard
6.5 - 8.5
10
700
10
10
1*
300
NE
50
NE
250
0.2*
500
NE
NE
0.3*
2017 Background Threshold Values (Shallow Flow Zone)'
4.4 - 6.1
1
50
0.5
1 4
11
684
NE
169
1 37
1
0.1
75
3
0.0005
1
2019 Background Threshold Values (Shallow Flow Zone )2
4.0 - 6.0
0.2
50
4
26
21
1700
3
969
34
4
0.2
57
2
0.0005
1
2019 Background Dataset Range (Shallow Flow Zone )2
3.3 - 6.1
<0.1 - 0.73
<50
<0.025 - 4.8
<0.5 - 26.2
0.16 - 22.9
<50 - 5750
<0.5 - 4.6
6.7 - 1000
6.8 - 103
<1 - 5.5
<0.1 - 0.3
<25 - 10700
0.0976 - 1.961
<0.0002 - <0.0005
<0.3 - 1.9
2017 Background Threshold Values (Deep Flow Zone)'
4.8 - 6.1
1
50
0.2
2
5
515
NE
78
56
10
0.1
71
2
0.0005
1
2019 Background Threshold Values (Deep Flow Zone )2
4.9 - 7.2
2
50
0.6
2
5
1840
12
260
69
15
0.2
107
2
0.0005
11
2019 Background Dataset Range (Deep Flow Zone )2
3.8 - 7.3
<0.1 - 2
<50 - 150
<0.025 - 1.2
<0.5 - 9.9
<0.1 - 6.1
<50 - 3200
1.5 - 13.4
5.2 - 408
6.3 - 70.5
<1 - 18.5
<0.1 - <0.2
<25 - 407
0.017 - 2.323
<0.0005
<0.3 - 12.2
2017 Background Threshold Values (Bedrock Flow Zone)'
5.4 - 7.4
1
50
0.1
4
1
6220
NE
89
107
15
0.2
120
3
0.0005
0.4
2019 Background Threshold Values (Bedrock Flow Zone )2
4.5 - 7.5
1
50
0.7
3
2
7680
11
113
93
17
0.2
120
3
0.0005
1
2019 Background Dataset Range (Bedrock Flow Zone
4.8 - 7.6
<0.1 - 1.2
<50 - 83
<0.025 - 0.8
<0.5 - 10.5
<0.1 - 2.6
<50 - 11000
1.1 - 7.3
5 - 134
16.6 - 116
<1 - 17.6
<0.1 - 0.5
<25 - 330
0 - 3.46
<0.0005
<0.3 - 1.5
Sample ID
Flow Zone
Mean, Geomean, or Median Result3
Background Locations
GWA-30S
Shallow
5.7
0.1
< 50
0.041
1.3
5.0
264
1.1
269
24
< 1
0.2
43
-
-
< 0.3
MW-30S
Shallow
5.3
0.1
< 50
3.120
3.0
0.4
159
1.2
8
10
< 1
< 0.1
33
0.490
< 0.0005
< 0.3
MW-32S
Shallow
5.0
0.1
< 50
0.177
0.6
1.1
73
2.5
37
27
< 1
0.1
59
1.206
< 0.0005
< 0.3
CCPMW-01S
Deep
5.3
< 0.1
< 50
0.324
0.8
2.2
53
2.0
42
< 5
< 1
< 0.1
< 25
0.138
< 0.0005
0.3
MW-30D
Deep
8.3
1.6
< 50
0.076
< 0.5
< 0.1
53
11.1
8
61
16
< 0.1
107
2.13
0.0003
10.0
MW-30DA
Deep
6.7
0.2
< 50
< 0.025
0.6
0.8
241
10.2
219
65
10
< 0.1
116
0.420
< 0.0005
0.3
MW-32D
Deep
5.9
0.1
< 50
0.034
< 0.5
1.8
< 50
2.8
11
40
7
< 0.1
73
0.526
< 0.0005
< 0.3
CCPMW-01D
Bedrock
5.2
< 0.1
< 50
0.056
< 0.5
0.3
< 50
1.1
8
22
1
< 0.1
40
0.693
< 0.0005
< 0.3
GWA 30BR
Bedrock
6.3
0.2
< 50
< 0.025
0.7
< 0.1
7198
3.6
70
52
14
< 0.1
90
0.2
MW-32BR
Bedrock
7.0
0.1
< 50
< 0.025
0.8
< 0.1
5305
6.1
33
57
16
< 0.1
103
< 0.249
< 0.0005
< 0.3
Within the Waste Boundary Locations
U5-02S-SLB
Ash Pore Water
6.6
5175.0
267
< 0.025
0.6
11.9
67850
54.9
643
1865
145
1.3
429
0.145
0.0110
0.6
1-15-01S
Shallow
6.2
4.2
< 50
< 0.025
0.7
7.5
54348
< 0.5
4504
138
5
< 0.1
217
-
-
0.5
U5-04S
Shallow
5.4
0.2
135
2.640
3.8
1.5
353
1.2
23
14
22
< 0.1
77
0.4
1-15-06S
Shallow
4.2
0.6
158
< 0.025
21
107
4010
8.8
5480
374
167
0.5
301
1.0
U5-08S
Shallow
6.5
12.0
< 50
< 0.025
< 0.5
1.1
6580
< 0.5
2980
150
27
< 0.1
211
< 0.3
U5-01D
Deep
6.5
0.5
< 50
0.094
< 0.5
1.0
232
20.7
221
68
3
0.1
129
-
-
1.6
U5-02D
Deep
6.7
4170
125
0.034
0.6
3.1
36740
16.7
872
1440
86
< 0.1
338
1.5
< 0.0005
< 0.3
U5-04D
Deep
7.3
1.4
< 50
0.105
1.7
0.3
456
9.6
28
113
65
< 0.1
183
-
-
1.3
U5-05D
Deep
6.3
1.4
331
0.035
3.1
19.2
11632
28.7
3222
186
194
< 0.1
422
3.3
0.0019
0.5
U5-06D
Deep
5.7
1.0
162
0.029
1.1
28.0
14182
21.4
1442
408
163
0.1
319
-
-
1.2
U5-08D
Deep
10.1
0.1
< 50
1.068
1.3
0.2
< 50
1.6
8
39
2
< 0.1
72
-
0.7
U5-02BR
Bedrock
6.0
164
120
< 0.025
1.2
25.1
6266
1.3
5910
396
22
0.3
195
0.0011
0.4
U5-04BRA
Bedrock
10.6
2.0
< 50
0.580
0.5
0.3
113
9
57
18
< 0.1
108
-
1.4
1-15-05BR
Bedrock
8.9
11.7
447
0.057
2.0
2.1
59
67.1
31
1342
555
< 0.1
1424
9.6
U5-08BR
Bedrock
10.0
3.9
< 50
0.690
1.4
0.0
47
11.3
< 5
33
13
< 0.1
124
2.6
Between Waste Boundary and Compliance Boundary
Sidegradient of the Ash Basin
CCR-U5-10S
Shallow
5.0
< 0.1
4
2.5
1.7
1.2
< 1
< 0.1
52
0.642
-
GWA-05S
Shallow
5.2
0.4
< 50
1.320
3.2
2.8
122
1.9
410
113
532
0.4
793
0.3
CCR-US-10D
Deep
5.5
< 0.1
10
1.3
0.8
0.9
15
0.1
88
0.277
-
GWA-05BRU
Deep
7.3
0.4
< 50
0.073
0.6
1 < 0.1
172
8.4
195
207
53
< 0.1
433
0.4
Downgradient of the Ash Basin
CCR-U5-03S
Shallow
5.9
< 0.1
94
0.579
1.5
0.2
102
0.4
290
165
50
< 0.1
169
-
0.3
CCR-1-15-04S
Shallow
5.4
1.2
563
1.200
1.9
83.7
683
5.2
1830
550
182
0.5
338
0.366
0.6
CCR-US-06S
Shallow
4.0
0.3
139
-
< 0.5
33.3
-
8.0
-
-
150
0.6
289
1.4
-
CCR-U5-08S
Shallow
5.6
0.4
17
2.6
25.1
1.0
218
0.2
372
0.459
CCR-US-09S
Shallow
5.2
< 0.1
324
-
0.6
5.2
-
1.4
-
-
12
0.1
61
0.827
-
GWA-02S
Shallow
5.5
< 0.1
129
0.202
< 0.5
0.2
203
0.5
206
129
65
0.1
181
0.331
< 0.0005
< 0.3
GWA-04S
Shallow
4.3
0.8
159
< 0.025
< 0.5
59.4
18260
5.8
2014
537
194
1.3
343
1.5
< 0.0005
< 0.3
GWA-36S
Shallow
5.3
1.2
79
< 0.025
0.5
51.6
1851
7.5
1028
234
109
0.6
206
0.613
< 0.0005
< 0.3
CCR-US-01D
Deep
5.9
< 0.1
7
-
0.7
1.4
-
1.1
-
-
53
< 0.1
195
1.3
-
-
CCR-U5-02D
Deep
5.3
0.1
80
-
4.3
0.7
-
0.9
-
-
43
0.1
116
< 0.28
-
CCR-US-03D
Deep
5.8
0.1
127
0.153
0.6
2.8
297
0.4
2033
253
72
0.2
212
1.3
0.3
CCR-1-15-04D
Deep
5.2
0.6
800
< 0.025
< 0.5
61.3
1605
6.8
3620
555
341
0.9
529
1.6
0.4
CCR-US-06DA
Deep
4.6
0.1
173
-
< 0.5
107
-
1.0
-
-
219
0.2
401
0.521
-
CCR-U5-08D
Deep
4.6
1.1
189
-
1.8
179
17.8
-
-
463
2.4
981
1.7
-
-
GWA-02BRU
Deep
6.2
0.2
127
< 0.025
< 0.5
0.5
431
10.7
115
158
69
< 0.1
269
1.2
0.0005
< 0.3
GWA-03D
Deep
5.7
0.2
400
0.362
2.0
3.3
174
4.7
1464
233
184
0.1
362
1.6
< 0.0005
0.6
GWA 04D
Deep
5.4
0.4
165
< 0.025
< 0.5
93.9
16200
7.4
4320
449
232
< 0.1
433
4.3
0.0007
< 0.3
GWA-31D
Deep
6.7
0.4
46
0.214
0.7
0.3
91
4.4
6
461
381
< 0.1
874
7.5
-
0.4
GWA-36D
Deep
5.6
0.4
165
< 0.025
0.5
37.4
1368
5.6
4436
323
308
< 0.1
572
0.707
< 0.0005
0.4
CCR-U5-04BR
Bedrock
6.8
0.5
1 414
1 < 0.025
0.9
1 0.1
7120
1 9.0
1 598
281
258
< 0.1
577
2.7
0.0003
0.4
Rev. 1
Page 1 of 2
23 April 2020

TABLE 6-31
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019
UNIT 5 INACTIVE ASH BASIN
CORRECTIVE ACTIVE PLAN UPDATE
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC
Analytical Parameter
pH
Arsenic
Boron
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Strontium
Sulfate
Thallium
Total
Dissolved
Solids
Total Radium
Total Uranium
Vanadium
Reporting Units
S.U.
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
Ng/L
mg/L
Ng/L
mg/L
pCi/L
Ng/mL
Ng/L
15A NCAC 02L Standard
6.5 - 8.5
10
700
10
10
1*
300
NE
50
NE
250
0.2*
500
NE
NE
0.3*
2017 Background Threshold Values (Shallow Flow Zone)'
4.4 - 6.11
1
50
0.5
4
1 11
684
NE
169
37
1
0.1
75
3
0.0005
1
2019 Background Threshold Values (Shallow Flow Zone )2
4.0 - 6.01
0.2
50
4
26
21
1700
3
969
34
4
0.2
57
2
0.0005
1
2019 Background Dataset Range (Shallow Flow Zone )2
3.3 - 6.1
<0.1 - 0.73
<50
<0.025 - 4.8
<0.5 - 26.2
0.16 - 22.9
<50 - 5750
<0.5 - 4.6
6.7 - 1000
6.8 - 103
<1 - 5.5
1 <0.1 - 0.3
<25 - 10700
0.0976 - 1.961
<0.0002 - <0.0005
<0.3 - 1.9
2017 Background Threshold Values (Deep Flow Zone)'
4.8- 6.11
1
50
0.2
2
5
515
NE
78
56
10
0.1
71
2
0.0005
1
2019 Background Threshold Values (Deep Flow Zone )2
4.9 - 7.21
2
50
0.6
2
5
1840
12
260
69
15
0.2
107
2
0.0005
11
2019 Background Dataset Range (Deep Flow Zone )2
3.8 - 7.3
<0.1 - 2
<50 - 150
<0.025 - 1.2
<0.5 - 9.9
<0.1 - 6.1
<50 - 3200
1.5 - 13.4
5.2 - 408
6.3 - 70.5
<1 - 18.5
<0.1 - <0.2
<25 - 407
0.017 - 2.323
<0.0005
<0.3 - 12.2
2017 Background Threshold Values (Bedrock Flow Zone)'
5.4- 7.41
1
50
1 0.1
1 4
1
6220
NE
89
107
15
0.2
120
3
0.0005
0.4
2019 Background Threshold Values (Bedrock Flow Zone)2
4.5 - 7.5
1
50
0.7
3
2
7680
11
113
93
17
0.2
120
3
0.0005
1
2019 Background Dataset Range (Bedrock Flow Zone)2
4.8 - 7.6
<0.1 - 1.2
<50 - 83
1 <0.025 - 0.8
<0.5 - 10.5
<0.1 - 2.6
<50 - 11000
1.1 - 7.3
5 - 134
16.6 - 116
<1 - 17.6
<0.1 - 0.5
<25 - 330
0 - 3.46
<0.0005
<0.3 - 1.5
Sample ID
Flow Zone
Mean, Geomean, or Median Result3
CCR-US-05D
Bedrock
6.9
1.1
384
-
0.7
5.4
-
4.5
-
-
151
< 0.1
452
< 0.599
-
-
GWA-02BRA
Bedrock
8.2
0.6
85
< 0.025
1.0
0.1
852
5.4
125
117
48
< 0.1
209
1.7
0.0004
0.7
GWA-31BRA
Bedrock
7.8
1.7
< 50
0.031
1.0
< 0.1
278
35.3
55
52
112
< 0.1
302
< 0.518
-
0.5
GWA-67BR
Bedrock
11.8
-
< 50
-
-
-
-
-
-
-
-
-
-
-
-
-
GWA-67BRL
Bedrock
7.4
0.2
133
< 0.025
< 0.5
0.1
1825
8.8
197
174
76
< 0.1
241
3.7
0.0004
0.4
GWA-68BRL
Bedrock
7.7
0.3
68
0.060
< 0.5
0.1
276
9.0
116
306
95
< 0.1
302
1.5
0.0019
0.6
Near or Beyond Compliance Boundary
Upgradient of the Ash Basin
MW-42S
Shallow
5.6
0.2
< 50
2.6
0.3
178
0.5
11
45
7 < 0.1
67
< 0.0005
< 0.3
GWA-45D
Deep
8.2
0.9
< 50 < 0.025
1 1.2
0.1
118
-
24
136
27 < 0.1
201
2.6
MW-42DA
Deep
7.2
0.7
< 50 0.079
0.8
0.3
152
36.5
43
112
105 < 0.1
302
0.0019
1.0
Downgradient of the Ash Basin
GWA-34S
Shallow
5.9
0.1
< 50
0.047
< 0.5
0.3
385
0.7
65
19
2
< 0.1
53
< 0.0005
< 0.3
GWA-35S
Shallow
5.8
0.7
110
< 0.025
< 0.5
16.9
16040
< 0.5
1692
50
41
0.1
131
-
< 0.3
GWA-37S
Shallow
5.8
0.9
80
< 0.025
1.3
92.7
15860
0.6
7866
74
71
0.1
182
-
0.3
GWA-56S
Shallow
6.1
0.2
< 50
0.383
1.8
2.1
820
1.3
146
66
138
< 0.1
314
0.435
< 0.0005
0.4
MW-34S
Shallow
5.2
< 0.1
< 50
0.063
< 0.5
1.2
130
1.2
25
5
< 1
< 0.1
< 25
-
< 0.0005
< 0.3
MW-36S
Shallow
5.7
0.1
57
0.200
0.6
< 0.1
261
0.4
15
41
10
< 0.1
57
-
-
0.4
MW-38S
Shallow
5.3
0.1
126
0.540
1.5
3.7
377
1.1
366
81
153
< 0.1
276
0.655
< 0.0005
0.3
MW-40S
Shallow
5.5
< 0.1
< 50
0.694
1.2
0.6
356
0.6
28
158
113
< 0.1
247
-
-
0.6
GWA-01BRU
Deep
7.1
0.1
< 50
0.067
0.6
0.2
795
3.0
59
45
8
< 0.1
95
-
< 0.3
GWA-32D
Deep
6.0
0.1
< 50
0.097
< 0.5
0.1
124
0.6
10
11
2
< 0.1
27
0.0002
< 0.3
GWA-35D
Deep
6.4
0.1
128
< 0.025
< 0.5
0.5
4578
10.5
119
112
63
< 0.1
189
-
< 0.3
GWA-37D
Deep
5.3
0.2
62
0.685
11.1
1.3
925
11.6
48
587
289
< 0.1
541
-
-
GWA-56D
Deep
6.5
0.2
< 50
< 0.025
1.4
0.6
1547
16.5
290
169
114
< 0.1
312
3.0
< 0.0005
0.3
MW-34BRU
Deep
7.4
0.1
< 50
0.028
< 0.5
< 0.1
783
1.3
40
64
12
< 0.1
118
-
-
< 0.3
MW-36BRU
Deep
6.9
< 0.1
< 50
0.026
< 0.5
< 0.1
216
2.9
67
71
7
< 0.1
121
-
-
< 0.3
MW-38D
Deep
5.8
0.2
233
0.109
1.1
2.6
196
7.8
398
211
232
< 0.1
424
1.2
< 0.0005
0.5
MW-40BRU
Dee
7.7
0.5
< 50
0.082
< 0.5
< 0.1
159
2.9
196
201
98
< 0.1
298
4.6
-
0.5
GWA-34BR
Bedrock
1 8.0
0.1
< 50
< 0.025
< 0.5
0.1
1057
1.5
80
66
28
< 0.1
163
-
< 0.0005
< 0.3
MW 38BR
Bedrock
16.6
0.8
52
< 0.025
1.0
0.9
2358
16.1
252
378
254
< 0.1
509
3.3
< 0.0005
< 0.3
Notes:
Background threshold values were calculated using data from background groundwater samples collected June 2015 to September 2017.
Z - Background threshold values were calculated using data from background groundwater samples collected March 2011 to December 2018.
3 - Statistical mean, geomean, or median calculated from data ranging from January 2018 to June 2019. Ash pore water results are not compared to groundwater standards or criteria.
Mean or geomean results were used based on the central tendency of the data set.
For wells with datasets containing fewer than four valid results, the most recent valid sample data was used.
Means were calculated for wells with four or more valid sample results. Sample results were excluded from calculations:
1) if turbidity >10 NTU (for COIs other than boron)
2) for unusable data (RO qualified)
3) if a result was non -detect at a reporting limit (RL) greater than the normal laboratory RL
Bold text - Constituent concentration exceeds applicable comparison criteria.
0 - bold highlighted concentration indicates value is greater than the 15A NCAC 02L .0202 Standard or the IMAC. (Effective date for 15A NCAC 02L .0202 Standard and IMAC is April 1, 2013)
O - bold highlighted concentration indicates value is greater than greatest background threshold value where there is no regulatory standard, or background threshold values are greater than regulatory standard
O - highlighted concentration indicates value is either within range of background threshold values for constituents where there is no regulatory standard/background threshold values are greater than regulatory standard, or within range of background threshold value and the regulatory standard
* - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013.
< - concentration not detected at or above the adjusted reporting limit.
- - value not available
NE - not established
mg/L - milligrams per liter
pCi/L - picocuries per liter
Ng/L - micrograms per liter
S.U. standard unit
Prepared by: TJG Checked by: TAW
Rev. 1
23 April 2020
Page 2 of 2

TABLE 6-32
COX MANAGEMENT MATRIX
UNIT 5 1 NACTIVE ASH BASIN
CORRECTIVE ACTION PLAN UPDATE
CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOORESBORO, NC
Groundwater Cliffaid. St... C Mean N.robi
Piedmont Concentration No,, X.—d— ""' Criterion —Ird— Monitoring Wells With COX Content C.—inarmill a le.g.l.t.u, on. Statistical) Y Stintiall= nd Near or ratio.
(2018 CSA Updl Criterion Derived B1.m..d .(.A , Background or Beyond Beyond
Flow cones) "t"'t V.I.. Range C01JJ Ratio Great., Th.. C.Innioreltiv. Ciri—
C.I.Pli.—
Bo,,d,W Bo —dun,,
Fl— Z...
Cou—tit ... t Standard, and Value, - 02L Criterion
J*
ry
-1
o e"'
I %to
Li... of Evidence (LOE) - 02L Criterion
Rationale for Selection of COX, for Corrective Action Evaluation
(for.... tit ... t. where no means ... greater then comparative criteria in all flow ....s
and/or multiple Ii..s of evidence support that Constituent occurrences ,, not related
to the ,,,,e area, no corrective action is warranted)
Rationale - 02L Criterion
m ene, ii—te, than 02L trund,im! n ..... beyond wmpli,nm Inuundem,
m are -ter than 02L -rdI n ..... beyond complimmuce bound.,
b. mean, gre,ter than 02L trund,im! n ..... beyond compli,me boundary
N: m an, gre,ter than 02L tend,rd, In ...... tumbn gre,ter than the beckground I, a potential indicator f,,h al ini (Figure 6-75,)
N m.— gnal than 02L etardind, h ... w, a— gnal than the mckg—rd �.Iu. ia . potential imli-or ofirlih tublin imi (Figure 6-75b)
No n— g,,t,, than 02L Mi-dend, however a— greate, than the b,,kg,und �alu, I, a potential i.di,,t,, dfai tralain mfhu— (Fill 6-75t)
-at., than b.tkg-u.d re.1.1 ll complimmuce Inuumd.-
nN.in—
On. mean gnal the, 02L -nd m, ,I,td —Irence, oon�iouant not nt g ter than ,mp ... ti—rid,II, Tn sel, ,... —ter (Fill 6-76)
No —ime g—ter than 02L -rdI n ..... beyond complimmuce bound.,
m..n�g-.t.,th.nb.-g-und�.'�....I.lb ... nd compli.me boundary
V,,,N
One mean �—Ier than batoground e, omdit,ent not pelient great,, than background v,l,e in ,h pone at,,, ,an 1, 1,, Ithin renge of deep fi— on,
be ko—nd omoin—on, detected at Cliftid, (Ficen, 6-77)
No n— greater than background! ,I,, ne—r beyond connulimuce inund,ry
Multiple munine grenter than bouk.-und value nubr— bell —plieno. bound.- and ..hibi- diacarrebl. plum. 'Figne, 6-1..)
On, mean grenter than be kg,,nd mine nem— beyond romplinno, b-nd­ a.hirit, di—murible plum, (Figure 6-79b)
No n— grant,, than b,,kg,und v,l,, n ..... beyond campli,me Inuundem,
Mu�:ipp�: m are grental bae,1.m.rd �.I.. —1.1 beyond C—Pli.r.c. a.urdI ..hibil diace-1:1. plum. lFigne, 6-81.)
M i m,,n,g,,t,,th,nb,ckg�nd�,lu,n,,,,,by,ndc,mpli,nc,b,und,�,.d,.hibi�di,m�,bi,pl,m,(Fig,m6-glb)
one ,,, g,,t,, the, b,,kg,u,d ,I ........ beyond campli,ma Inuumnlim,, ohibit, di,c .... bl, plum, (11116-81,)
No r— gre I., than 02L -ndent nulan., bell compliance bound.-, �uhel great., than a.tkg-umd..Iu. -.Pp.d (1116-133.)
0 mean gre,ter than 02L tend,ndl n ..... beyond compli,me teumudem,, ohibit, di—m,bl, plum, (Fill 6-83b)
0 g,,t,,th,, 021--rdI ...... beyond complimmuce Inuumnlim,, ohibit, di,c .... bl, plum, (IIII 6-8l
No r— gres ., than 02L -nd.- nulan., bell compliance bound.-, T.S gre.tarthl beckground �alu. m.pp.d,Fig.- 6--.)
0 , ,,, g,,t,, the, 021--rdI ...... beyond complimme b ... d­ ohibit, di,c .... bl, plum, (IIII 6-84b)
On, mean gre,ter than 02L trund,im! n ..... beyond compli,me teumudem,, ohibit, di—m,bl, plum, (Fill 6-8l
11111
111,111111111111111111 111 iiiiiiiiiiiiiiijilli III I Jill 11 111 Jill I
Rationale - IMAC Criterion
Or. 9—ter than b.,k9m.rd value near., beyond mumplience bound.-, e.hibit, dia-milible pi— 1149tre, 6-7.)
No m an, greater than b,,kg,und ,I,e ne .... beyond compliame boundary
No mean, gre ter than b,,kg,und ,I,e ne .... beyond compli,me Inuundery
C ne .... beyond compli,me Inuundem,
No m::n:
gg,,:::,:hh:n:M
N n r n M C near or beyond campli,me boundary
mean,
No greater than 'MAC re—r beyond campli.muce bound.,
No mean greater than b:,kkgg,und , lue near or beyond compli,me Inuundem,
No -Zm
greater the, b ro rd �.I.e re—r beyond campli.me bound.,
No mean, greater than b,,kg,,nd ,I,e near or beyond compli,me boundary
Constituent Standards and Values - Background Criterion
Lines of Evidence (LOE) - Background Criterion
Rationale - Background Criterion
One rn—g—terthum background! v,l,,near,rbey,nd oamar=bmmd­ out- probably not Influenced by,oh tuoln, di —able plurne-lit, lthin the
e boundar' IN une 5-80b)
Oem... g—terthern b,,kg,,,d val"erear or beyond compliance alu"i (Figurne 6-80c)
Multiple mean, tire tarthan blu,kg-und value near or beyond mumplience a—dar, and a.ribite diommuribl, plum, (Figure 6-82,)
Multiple n— greaterthi b,ckg,und uu, n ... or beyond c—ph-ce boundary and e,hiblite di —able plum, (Figure III
On, ,an g ter than background value near or beyond oannuir,mol, inuund­ e,hibit, ch n,ble plum, (Figure 6-82c)
No me— greater than background value near or beyond to pli—inudird.,
--e—grentertivi-bark round blue ... ur at 1—timin, GWA-56D and —40BRIJ, ­0 ime umide the d,t Mble b,,n pl,me and therefore probably not
indiketive f,,h no,in influenre. C—tituent not P—M, in an mure ater dureater than bark—nd mine.
N.meamiligne.-thumb kgg nd n::r b nd me b. 'nd:,
me— greater than b:ck und v:�u or b:,.nd I, b nd
-1--
0"0--­Vr' b—d rn qr.11-1�1
I� hal,
--t—
.A
Rev. 1
23 April 2020