NC0004987_Errata_20200505

161P
synTerra
CORRECTIVE ACTION PLAN
UPDATE
REVISION 1: APRIL 23, 2020
Site Name and Location:
Marshall Steam Station
8320 East Carolina Highway 150
Terrell, NC 28682
Groundwater Incident No.:
Not Assigned
NPDES Permit No.:
NC0004987
NCDEQ CCR Impoundment Ranking:
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 35.59778/W-80.965

FIGURES

A 11� A'
H BASIN WASTE POWER LINE
(NORTHWEST) ASH
RNV ASH BASIN WASTE (SOUTHEAST)
BOUNDARY
900 + m BEND IN DDASMBASIN 900
\ a s mmm CROSS SECTION m m m m m o m ae-ts J J
¢ ¢ ¢ ¢ ¢ ¢ a
SAPROLITE FILL m m m e 39 za o cc
m ci 4 m m o m m m
FILL ¢¢ ¢ ¢ 369 moimm mmm . m 2.ai
-mow-�„�H- _ ASH ros ssa m a a ¢ ¢ a ¢ r _________ASH _ _
______ - P _____ ________ _ na-9s
800 1 ____ ________ 0 EWATER-� � $00
_ _
♦ / _ \ ♦ / - / ♦ / - �► ____ ____________r_�.►___.____________,__________ ____________ a as � � � � � � � � � � LAKE NORMAN
- --ASH PORE WATER---------- ----------------
/ SAPROLITE _ ______ ____________E______________
TRANSITION io+y _ FILL EL. 760
________ _ _ _ Li c05 -- _____ ______________________________ __________
ZONE --_ -__________'-____ASH PORE WATER _______________
/\\ / - 1 I \\ '\' �/ 1 -\/ \/ �\ / \ /\ / 1 1\\ /1 \ ♦ 1 - \ �\ / \ \/- 1 \ \/ \ \/ 1 \\ \ / '\ /\\ / 1s.i 1 \ - asi \ \ /\/-1 - \—/ /\ /\-a aozz-'/\-1 -/ \ / '\ /\ \ /♦/- /1 \ �\\ .as-v9 ----
SAPROLITE �_�
700
sio
\ - 1
700
01
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♦ / _ ♦ / _ \ / _ _ / _ ea-2zea / _ a uta _ \ _ - \ ' \ - \
\/ i \i l \ / I / \ i l \ / I / \� l \ / � / \ i l \ / I \\' l \ / I / \ i \\/ �e-is°rt / \ i l / \ I / \ i / \ / e st ,\/ I / \ i / \ cl iv / \♦/ I / \ i \i l \♦/ I / \ i l \\/ I � \� l \ / I / \ i l \\/ � � \� l \♦/ j / � \� / i]a - / \/ � \_
I \ \/— / /\• I \/
\ / I
C /♦- z - \ /♦- \- / ' 1 /♦-- \- / / - \ /.-- \- / � -_ \� / / - \'/♦-'\- / " ♦ - \- 1 /.-- \- a sso - \'/♦__ \� _ / , / _ _ / _ / C �.
�+ 600 / i / i l \ / / \ i l ♦/ i l l \ / I / \ i l ♦/ i l i l \ / I / \ i l ♦ u +A I / \ i l ♦/ i 17 �/ Ti-~♦/ ma I \ i/ /♦/ / l i l I \ l i l \ I \ i' /♦/ i - 1 / ♦ - \ \ /\/ - I zao I \ \ i/ / i / i / ms I +9\ \ / /♦/ i l \ 600 +'
� � I♦/\/_/\I♦/\I//I♦/\/-\/�I♦ ;ros zsa /\/-\/♦/\�_\/1♦/ /_\/./--\/ \/_\/ /-_\/♦/ _\/./-\/♦/--\ _\/./ _\ --\/♦/ _
Z \ /1/ \/\ /1 \ \ /1/ \/\ /1 \ \ /1/ \/\ /1 \/\ / 1/ /\I/1 \/\ /1\/\I/1\' \/\'/ /�\/\I/1\'\/\I 1 �/ \ u zs /\I/ 1// \/ '/1\'\/\'/ /' \/\I/1\ /' \/\I 1 '\/♦I/1 / \/\'/1\ / \ Z
/� 1 /� - \'/ - \ - 1'/ -'� - 1 / - \ - 1'/ - /� � \'/ - \ - 1'/ - � - \'/ - \ \'/ - /� - \'/ - - \'/ -'� - \'L \�\'/ - /\ _ \�/ � _ ros Is] \'/ - \ - 1' - /� - 1'/ - \ - \'/ -'\ - 1 / - \ - '/ '\ '/ - \ \'/ - /� - 1 O
O/\♦BEDROCK\\'/♦\/ \\i/\/I/ /\\/\♦/I/\♦ -/\ I \\_/♦ / -/ _ -/♦/// -/\ \ \_/♦// -/\ ` .♦ -/\ \- _. iaw. -/\ `
/1 1
\ / I \ / / \I \ /— I \ / / \ \ / I \ / \I \ /— I \ / / \I \ /— I \ / / \I \ /— I ♦ / / \I \ / I \ / / \I \ /— I \ / / \I \ — I \ / — I / / I \ / /1 \ \ \ /1 \
W 500 /♦ \ \ /'♦/-� 1'/♦ \ \ /'♦ -� 1 �/� - \ \%'-� 1/♦- \ - \ /'♦�-� 1 / \ 1 /'♦�-� 1 �/� - \ \ /'♦/-� 1 �/� - \ \%'♦�-� \ �/� - \ \ /'♦/-� \ �/♦ - \ 1 /'♦/-� \ �/� - \ zaz — \ �/� - 1 is '/ \ 1
\/I�\/' \ I_\/i \/I/\/' \ I-\/i \/I/\/' \ I_\/i \/I/\ i \ I_\/i /I�BEDROCK 1_\/ \/1/\/i \ I_ /i \/1/\li \ I \/i \/I/\l \ I_\/i \ 17\/' \ 1 i \/I/\/' _ is \/� \/I�\/'s ]sz i \1%I/\/ 500 LLI
J ♦ / - _ \ / ♦ / _ \ ♦ / - - \ / ♦ - \ / ♦ / - - \ / ♦ / - \ / / - \ / ♦ / - \ / ♦ / - - / _ \ / / - - \ / ♦ / \ / / - - \ / ♦ / _ \ / ♦ / - - / / - \ / ♦ / - BEDROCK / - \ / / - - _ \ / - - \� _ \ / ♦ / - -
I \/\/\I/1\/ /\1 \/\/\1/1\/ /\1 \/\/\I/ \' /\I♦ \/ /\I/1\' /\I \/\/\I/1\' \I \/\/\1/1\/ /\1 \/\/\I/1\ /\I \/\/ I/1\' /\I \/\/\'/1\' /\I \/\ \ \/\I/1\/ / I \/\ I.J LJJ
\
400 `� : /'—`� ','_`� : /'—`� ','_`� : /'—`� '_`_: /'—`/' ''' `� : /'L�'` % /'� `�� �taal� \� '/'=`/_ 400
\ \-/ / -/ \ ♦-/ / -/ \ \-/ / -/ \ \-/ / -/ \ \-/ / -/ \ \-/ / -/ \ \-/ / -/ \ \-/ / -/ \ ♦-/ / -/ \ \-/ �I / \
\
`/ /\i � / I i \ u 8.2
I\/\�-\ I \/—\ I\/\/_\ I \/—\ I\/\/_\ I \/—\ I♦/\/_\ I \/—\ I♦/\/_\ I \/—\ I\/\/_\ I \/—\ I\/\/_\ I \/—\ I♦/\/_\ I \/—\ I♦/\/_\ I \/—\ I\/\/_\ I \/—\ I\ \/-ros z —\ I♦/\�_
300 300
200 200
LEGEND NOTES COI NOTES:
INDUSTRIAL SHALLOW FLOW LAYER GROUNDWATER
LANDFILL #1 AB 9S WELL IN SAPROLITE MATERIAL _V_ WELL WATER LEVEL ELEVATION 1. WATER ELEVATIONS REPRESENTTHE MAY, 2019 GAUGING EVENT 1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS CALCULATED
a xl FOR EACH WELL. NOTE ELEVATIONS WITHIN EACH CLUSTER ARE BASED ON CENTRAL TEN DANCY OF DATASET USING DATA RANGING
\ � DEEP FLOW LAYER GROUNDWATER MEASURED IN THE SAME DAY. REFERENCED TO NORTH AMERICAN FROM JANUARY 2018 TO MAY 2019. WELL IN TRANSITION ZONE
WELL WATER LEVEL ELEVATION VERTICAL DATUM 1988. 2. BORON (B) AND LITHIUM (U) CONCENTRATIONS ARE IN MICROGRAMS
AB 15BR WELL IN BEDROCK 2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENTTHE PER LITER (pg/L).
BEDROCK FLOW LAYER GROUNDWATER GENERALIZED ORIENTATIONS OF THE PREVALENT FRACTURE SETS 3. CHLORIDE (Cl) AND TOTAL DISSOLVED SOLIDS (TDS)
AB 15S WELL IN ASH PORE WATER _V_ WELL WATER LEVEL ELEVATION OBSERVED AT THE SITE BASED ON TELEVIEWER LOGGING AT CONCENTRATIONS ARE IN MILLIGRAMS PER LITER (mg/Q.
DRY ASH AB 18D ABANDONED WELL SITE -SPECIFIC BOREHOLES. THEY ARE SHOWN WITH APPROPRIATE q, WELLS WITH DATASETS CONTAINING FEWER THAN FOUR VALID
LANDFILL ASH PORE WATER FLOW LAYER APPARENT DIP, WITH VERTICAL EXAGGERATION. THIS CROSS SECTION RESULTS, THE MOST RECENT VALID SAMPLE DATA UP TO TUNE 2019 WAS
(PHASE II) . WATER LEVEL ELEVATION IS APPROXIMATELY PARALLELTO THE PREDOMINANT FRACTURE USED.
• GENERALIZED WATER TABLE STRIKE DIRECTION. THE ACTUAL NUMBER OF FRACTURES IS FAR TOO
ASH BASIN 01111111 ae9ea MEAN BORON (B)CONCENTRATION (ug/L) NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN ADDITION, THE DEPTHS ANALYTICAL PARAMETER B Cl U TDS
-, a <so MEAN CHLORIDE CI AND LENGTHS OF FRACTURES VERSUS DEPTH ARE CONCEPTUAL
GENERALIZED GROUNDWATER ( ) CONCENTRATION (mg/L) ONLY. REPORTING UNITS Pg/L mg/L pg/L mg/L
FLOW DIRECTION cl to MEAN LITHIUM (Li) CONCENTRATION (pg/L)
-► GENERALIZED ASH PORE WATER " R3 MEAN TOTAL DISSOLVED SOLIDS (TDS) 3. ALL BOUNDARIES ARE APPROXIMATE. 15A NCAC 02L Standard 700 250 NE 500
FLOW DIRECTION CONCENTRATION (mg/L) Background Threshold Values so s s 1sz
4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING (Shallow Flow Zone)'
PV STRUCTURAL DRY ASH CONDITIONS.
FILL _ � _ PREDOMINANT BEDROCK WELL SCREEN Background Threshold Values so 4 10 zoo
LANDFILL (Deep Flow zone)'
(PHASE I) FRACTURE ORIENTATION
Background Threshold Values
ASH ASH BASIN COMPLIANCE BOUNDARY (Bedrock Flow Zone)' so 4 11 195
ASH BASIN - UPDATED BACKGROUND THRESHOLD VALUES (BTVS) WERE
ASH PORE WATER ASH BASIN WASTE BOUNDARY CALCULATED USING DATA FROM BACKGROUND GROUNDWATER SAMPLES
COLLECTED FEBRUARY 2010 TO DECEMBER 2018.
LAKE FILL
NORMAN
FGD RESIDUE SAPROLITE GRAPHIC SCALE
LANDFILL ' DUKE o 350 700 FIGURE 6-7a
TRANSITION ZONE GENERAL CROSS SECTION A -A'
HORIZONTAL SCALE: 1" = 700'
NOTE: BEDROCK ENERGY VERTICAL EXAGGERATION
AT CONSERVATIVE GROUP
5X VERTICAL EXAGGERATION
SURFACE WATER CAROLINAS DRAWN BY: J. CHASTAIN DATE:08/01/2019 MEAN OF BORON, CHLORIDE, LITHIUM,
CROSS SECTIONS ARE LINEAR IN NATURE AND ALL REVISED BY: D. KREFSKI DATE: 12/24/2019 TOTAL DISSOLVED SOLIDS
LOCATIONS NOT ALONG THE CROSS SECTION ARE CHECKED BY: B. WILKER DATE: 12/24/2019
PROJECTED ONTO THE CROSS SECTION. ' APPROVED BY: B. WILKER DATE: 12/24/2019 CORRECTIVE ACTION PLAN UPDATE
PROJECT MANAGER: B. WILKER DATE: 12/24/2019 MARSHALL STEAM STATION
CROSS SECTION LOCATION synTerra www.s nterracor TERRELL, NORTH CAROLINA
Rev. 1
23 April 2020

900-
800
700
600
Z
_O
Q
W 500
W
400
300
200
A W. A'
ASH BASIN WASTE POWER LINE
(NORTHWEST) BOUNDARY RAW ASH BASIN WASTE (SOUTHEAST)
BOUNDARY 0 � �
ASH BASIN 900
ttttp ro b BEND IN DAM
a s m m m CROSS SECTION m m m m
"IF
SAPROLITE 1 of m m of ob ob °b �_u ,1 m m m m
vFILL" FILL
¢ ¢ ¢ ¢ ¢ ¢ ¢ s nz mmmobmobm o rn
___ ______ _WAWA__- _��.-_ H_= _ ASH
\ I =__-_ _=====ASH P_ EWATER� WAWA _ ze-°s ra z.z 3r � 800
WAWA__ WAWA_ _
WAWA _ WAWA
____WATER__________ n LAKE NORMAN
I ♦ / \ / \I/, ` / - \I ` / SAPROLITE __ A&rss ___=_ASH PORE WATER.__ ______ WAWA___ n o.za__WAWA ___WAWA_ EL. 760
TRANSITION sr 40 WAWA___ __________ WAWA_ WAWA_ _ FILL
ZONE
WAWA_ / 1zs - _________________________
WAWA_ WAWA ASH PORE WATER _____________ _
\ \ _ / ♦ / \ \ / _ _ _ ♦ / n a sazssu WAWA sszo------------- _____________________----_-----
_ 1 , \ \ / 1 , / 1 , \ / \ /, zA____________
� I ♦/\ \I `/- I n �,�/1� /\ r° za /,`�\ SAPROLITE M-1` TRANSITION
/ ' /♦ - ' - - - -- ZONE - - 1
1 \/i - �zssr \ I-\/i \ / I/ \/ \ \ \/ \/i \ /i \ s. zazs / i / ro z \ / I/ \/ 700
I ♦ , / I \ / I � / \I \ /_ I \ / / \I ♦ / I ♦ / / \I ' - / ♦I \ /_ I ♦ / ♦� - i \I � - i / I ♦ I ♦ , / \I \ /_ I ♦ / n - I / \I 1 ♦ i -/ \I \ / �
-
/--\'`/♦��\��/--\'`/♦/�\��/ _\/�/\�\\ a zosa '♦/�\�./--\'`/♦i�\���n <az _,�/-\\i /�/- _\/./-\\i./--\'`/-`\��/- -`\ --♦'n caz ♦�./-
<az<z 1, \/\I/1�'\/\I/ , \/\I/1 �/1/ \/\I/1, \ /1,. wr*saa \/\/,, \ \I/1�/\/\I 1, \/\I/1�: z , \/\/,,'\/♦ - sv /\I/1�'\ .�.
n� _�/I�\/� `'I�\/i/\/I�\/� '1� n <az \'I/\/i/\/1�41-G� /y/1 600 zl
/1"\ \/1 /\I ♦/ /\/1 /\I \/ I ♦/ I \/ /\ ,, �\ �`/�/�\/ I/1"\/\/ ,�\/\I/1"\ \/1,\/\I 1 '\/\/1, \/\I/1"\ Z
i/BEDROCK\`�/ I/\ i/\\/ (..�\`li/JL\ it \\/ \`�/\ / I/\ /\\/ I/ \`�/\I \ i/\\/ I/ \`i/\♦/ I \ it \\/ I / \`mil \ I \/ �\ / I / - l \/ \/ \il \ / I \ it \/ \/ ♦i / i / - l \/ / \i I��x°n>_ - l \/ \/ �_
\ i \ /T
. / - -\� ` / - \• . i _\� / - \ \i . / _\ . Al,
zesa /Ti
BEDROCK I\/i'I\/Ili/I\/1\l'i/1\lNV
1 \ / i i1 \ l i \ / I _ i / I i \ l \ / i / I \/ \ / 1 _ \ l i % / I \ l 500 W
I/1♦/\/\I/1" /\I\/♦�_\ 1 `/_\ 1\/\�_\ 1 ♦/_\ 1\/\� \ 1/_\ 1\/\i_ I ♦, _\ 1\/♦�_\ 1 `/ \ 1\/♦�_\ 1 _\ 1\/\�_ 1\/\BEDROCK ♦, \ 1\/♦�_ I ♦, _\ 1\ ♦ _i I �, _\ 1\/\�- W
\/1,�
'1/ / \ I \/-�\I ♦ / / \ I \/ I \ / / \ I I ♦ / -
400♦ \
"- /\/1 %\I./♦�-�\I/1-�\I./`�-�\I/1"-�\I/`�-�\I/1"-�\,..`�-�\'.1"-�\I./`�-�\I/1"-�\I./"-�\I/1"-�\,, .`�-�\I/1;'\\�\'.1` rail ���\I.�"�
/
/ 1 \/� \ /1 - \/' i ' 1 \/� \ /I - \/' i ' I \/� \ /I - \/' i / I \/� \ /1 - \/' i / 1 \/� \ /I - \/' i / 1 \/� \ /I - \/' i ' I \/� \ /I -\/' i ' 1 \/� \ /1 - \/' i / I \l 300
1 , / ` _ \ 1 ` , -, 1 ..` _ \ 1 ` , - \ 1 \ /♦ _ \ 1 , - \ 1 , . ♦ _ . 1 / - \ 1 , / ♦ _ \ 1 ` , -, 1 . / ` _ \ 1 ` , - \ 1 . / ` _ \ 1 , - \ 1 , / ` _ \ 1 , - \ 1 , / ♦ _ \ 1 ` , -, 1 .. ` _ \ 1 ` , - \ 1 . ` / _ \ 1 , - \ 1 ..`
LEGEND
NOTE:
INDUSTRIAL
LANDFILL#1 -
DRY ASH
LANDFILL
(PHASE II)
ASH BASIN
STRUCTURAL DRY ASH
L LANDFILL
RESIDUE
)FILL
CROSS SECTIONS ARE LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
WELL IN SAPROLITE MATERIAL
WELL IN TRANSITION ZONE
WELL IN BEDROCK
WELL IN ASH PORE WATER
ABANDONED WELL
GENERALIZED WATER TABLE
GENERALIZED GROUNDWATER
FLOW DIRECTION
GENERALIZED ASH PORE WATER
FLOW DIRECTION
PREDOMINANT BEDROCK
FRACTURE ORIENTATION
ASH
ASH PORE WATER
FILL
SAPROLITE
TRANSITION ZONE
BEDROCK
SURFACE WATER
COI NOTES:
NOTES1.
ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS
CALCULATED BASED ON CENTRAL TENDANCY OF DATASET
SHALLOW FLOW LAYER GROUNDWATER
1. WATER ELEVATIONS REPRESENT THE MAY, 2019 GAUGING
USING DATA RANGING FROM JANUARY 2018 TO MAY 2019,
WELL WATER LEVEL ELEVATION
EVENT FOR EACH WELL. NOTE ELEVATIONS WITHIN EACH
z STRONTIUMND THALLIUM T ARE IN MICROGRAMS
(Sr)( ) ( )
CLUSTER ARE MEASURED IN THE SAME DAY. REFERENCED
PER LITER (pg/L).
DEEP FLOW LAYER GROUNDWATER
TO NORTH AMERICAN VERTICAL DATUM 1988.
3. TOTAL RADIUM CONCENTRATIONS ARE IN PICOCURIES PER LITER OF
WELL WATER LEVEL ELEVATION
2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENT
AIR (pCi/L).
THE GENERALIZED ORIENTATIONS OF THE PREVALENT
4. WELLS WITH DATASETS CONTAINING FEWER THAN FOUR
FRACTURE SETS OBSERVED AT THE SITE BASED ON
VALID RESULTS, THE MOST RECENT VALID SAMPLE DATA UP
BEDROCK FLOW LAYER GROUNDWATER
TELEVIEWER LOGGING AT SITE -SPECIFIC BOREHOLES. THEY
TO JUNE 2019 WAS USED.
WELL WATER LEVEL ELEVATION
ARE SHOWN WITH APPROPRIATE APPARENT DIP, WITH
- NO DATA AVAILABLE
VERTICAL EXAGGERATION. THIS CROSS SECTION IS
ASH PORE WATER FLOW LAYER
APPROXIMATELY PARALLEL TO THE PREDOMINANT FRACTURE
ANALYTICAL PARAMETER Sr TI Ra
WATER LEVEL ELEVATION
STRIKE DIRECTION. THE ACTUAL NUMBER OF FRACTURES IS
FAR TOO NUMEROUSTOILLUSTRATEATTHISSCALE IN
REPORTING UNITS
pg/L pg/L pci/L
ADDITION, THE DEPTHS AND LENGTHS OF FRACTURES
MEAN STRONTIUM (Sr) CONCENTRATION (Ng/L) VERSUS DEPTH ARE CONCEPTUAL ONLY.
MEAN THALLIUM (TI) CONCENTRATION (ug/L) 3. ALL BOUNDARIES ARE APPROXIMATE.
MEAN TOTAL RADIUM (Ra) CONCENTRATION (pCVL)
4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING
CONDITIONS.
WELL SCREEN
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN WASTE BOUNDARY
' DUKE
�' ENERGY
CAROLINAS
16,
synTena
GRAPHIC SCALE
0 350 700
HORIZONTAL SCALE: 1" = 700'
VERTICAL SCALE: 1" = 140'
5X VERTICAL EXAGGERATION
DRAWN BY: J. CHASTAIN DATE: 08/01/2019
REVISED BY: D. KREFSKI DATE: 12/24/2019
CHECKED BY: B. WILKER DATE: 12/24/2019
APPROVED BY: B. WILKER DATE: 12/24/2019
PROJECT MANAGER: B. WILKER DATE: 12/24/2019
www.synterracorp.com
1SA NCAC 02L Standard
NE 0.2' S^
Background Threshold Values
(Shallow Flow Zone)z
210 0.2 5
Background Threshold Values
(Deep Flow Zone)'
727 0.1 7
Background Threshold Values
(Bedrock Flow Zone)z
313 0.2 6
�-UPDATED BACKGROUND THRESHOLD VALUES(BTVs) WERE
CALCULATED USING DATA FROM BACKGROUND
GROUNDWATER SAMPLES COLLECTED FEBRUARY 2010 TO
DECEMBER 2018.
' - INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC)
OF THE 1SA NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
^ - FEDERAL MAXIMUM CONTAMINANT LEVEL.
FIGURE 6-7b
GENERAL CROSS SECTION A -A'
NON -CONSERVATIVE GROUP
MEAN OF STRONTIUM, THALLIUM, TOTAL RADIUM
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
Rev. 1
23 April 2020

A N. A'
ASH BASIN WASTE POWER LINE
(NORTHWEST) BOUNDARY RIW ASH BASIN WASTE (SOUTHEAST)
BOUNDARY Q
900 $,s 0 � C, ASH BASIN 900
ro BEND IN LO LO LO LO DAM
a s m m m CROSS SECTION m m m m
Q Q Q Q Q Q Q m N N m fn
SAPROLITE FILL m rn u) co Ia
V� FILL ¢ ¢ ¢ ¢ ¢ ¢ ¢
tea.-=- =H-=- - ASH ¢ ¢ ¢ a a a r? ti
HOO_________ _________ASH P_ E --------
_--__ 800
�► ____ ____►________ __ _________________ LAKE NORMAN
--- ---- u-Isa -- ASH PORE WATER.------_ ---
_______________
\ \ - k 109s
TRANSITION SAPROLITE - as - - _____________iF_ __ __________________________________________________________ _____ FILL EL. 760
__
ZONE _ / =c_ ---- --_r_ �R=_ASH PORE WATER _____ _-----_-_
I\/♦/\\/I\/♦/\\/I /\/_\/I - \/\/_\/I\/` \\/I\/ •Fzm \� \ /I\/-\/I\/\�\\/I\/k <a \ ♦ � eaaa I\/ __________________ ______ Cep-�92
/ 1 , / 1 , \ / \ / 1 , \ /� 1 , \ / \ / 1 , \ /� / 1 , \ / \ / 1 a <e. 1 / \ \ / 1 , \ \ / 1 , \ / \ / 1 •^ / 1 , / \ / eau \ / 1 \ ae90 f SAPROLITE TRANSITION ae-sa
/♦-- \ /� -� 1 �/♦ - 1 - 1 //\/-� 1 -- \ - \ //\�-� 1 �/\ ra 29a _ 1 /_- - /♦�-� 1/\-- \ \ /'`�-� '/\-- \ - 1/\� \� 2wa ZONE co 2a - 1 \- ro as - 1 700
700 ,/,r\ �I-\/, \ I/\/, \ I-\/, \ I/\/, \ I \, \/" 2 I-\/, I-\/, \/I/\/ \ I \/, \/,/ /, \ \/ \/, \ /, \ / , /■. 9asz /I/\/
/- \-\' \-1'/- \ -1'/- \-1'/- \-\'/- \-1 /- \ -1�/ \-1'ro \� \-1'/- /- \-1'/ ce "/- \-\'/ \ -\'/- \-1'/- \-1 /- \-\'f--�\ -1�- \-\ / \-1 rn■- \'/- \ -1
\ / \ / / \I \ / \ / 1 / \I \ / \ / 1 / \ ' 1 / \I \ / \ / / \I as 1 / \I / 1 \ / \ / 1 \I ♦ / \ / \I 1 ♦ / / \I \ eF3sa \ /-/ \ / \ / 2a7
yj /`-- \ - \ l'`/ i � 1 %/` _ \ \ /'\/_i � 1%/`-_ \ _ \ /'♦/_i � 1%'\ _ ' /-� � 1 �/\-- \ _ / \�//-�/�-� /ra s000 �- \- \ �/� _ \ - 1 +�
v60O ,/,,\/, \ \/, ,/,,\/ \ I_\/, \/,,\/, \ I_\/, \ ,\/, \ I_\/. \/,,\r7/T _Tr, \/,,\l, \ I_\l, ,/,,\l, I_\/lea �.� \l, \ 1_\l. \/,,\Lc� _yl--� ,/,, I_\li / ,\li \ 1 \/. \/I'\/ 600 �
__\._-�.'.�"-��,\/♦�_\/I\/ /-\/I\/♦�_\/I,/I\.`/_\/I\,\�_\ I\ \/-\/I\,♦ice sas ♦/-\ I /I„♦
Z
Z / 1 \ / 1 \ / \ / 1 , \ / \ / 1 \ ` / 1 , \ / \ / 1 \ / / 1 \ / \ / 1 \ / \ / 1 \ / \ / , \ / \ / 1 \ , \ / 1 \ / \ / 1 , \ / / 1 \ / \ / / \ \ \ / 1 / \ \ / \ / 1 / \
_ /�_ /�_ /�_ /�_ /�_ /�_ / /�_ _ /�\ /1, /�\ 1, / \ /1,�\
/BEDROCK\` // / I / \ , / \ / FL\`l i/ 1L\ , / \\/ \`, / \ \ / \\/ , / \`, / \ / I \ , / \ / , / \`, / \ / I \ , / \ / , / \`, / \ I / \ , / \\/`T \`- \` , / \ I \` /■-Ia�u / \\ I \\
/--\\/I\-\ -/\\ --\\/I
W 500/\-- \ \ //-� /�-�/-��/-� \ /\-- / T G i
/ , / \/ , \ I _ \/ , \ / , / \ / , \ I _ \/ , \ / , / \/ , \ I _ \/ , \ / , / \ , \ I _ \/ , / I /BEDROCK 1 _ \/ \ / , / \ / , \ I _ / , \ / , / \/ , \ I \/ , \ / , / \ / \ I _ \/ , \ I / �/ , \ I , \ / I / \ / az2 \/ , \ / , / \/ , \ I _ \/ , I / \ / 500 LU
\ \ / - _♦ \ / - _♦ \ / - BEDROCK \ \ / - _\ \ - _\/ \ _\ \ / -\/ / -
` \ " \ LU
IJJ
N/1
40O/\`/1'\/\/\\/I�\/`\''\/\\/I�\/'/`\'1'\/\/\\/I�\///♦\/1'\/\/\\/I�\//♦`/1'\/\/\\/1�`/'/`\/I'\/\/\\/1�\/,/`\'I/\7'\/\\/I�\/,/\','\/'\/\\/L__�`/\`'1'`/�'\\'1'\/,/``/1'\/1 400
\ I /
300 / 1' \i-\/, \ / I/ \�_\/, \ / I/ \�_\/, \ / I/ \�_\/, \ / I/ \�_\/, \ / I/ \�_\/, \ / I/ \1_\/, \ / I/ \1_\/, \ / I/ \�_\/, \ / I/ \�_\/, \ / I/ \1_\/, \ / I/ \/ 300
I \ / 1 , \ / \I / 1 \ / \ / 1
200 200
LEGEND
STRUCTURAL
RESIDUE
NOTE:
INDUSTRIAL F'
-AN'DFILL�#1 g
I{
i
DRY ASH
LANDFILL
(PHASE II)
DRY ASH
LANDFILL
CROSS SECTIONS ARE LINEAR IN NATURE AND ALL
LOCATIONS NOT ALONG THE CROSS SECTION ARE
PROJECTED ONTO THE CROSS SECTION.
CROSS SECTION LOCATION
WELL IN SAPROLITE MATERIAL
WELL IN TRANSITION ZONE
WELL IN BEDROCK
WELL IN ASH PORE WATER
ABANDONED WELL
GENERALIZED WATER TABLE
GENERALIZED GROUNDWATER
FLOW DIRECTION
GENERALIZED ASH PORE WATER
FLOW DIRECTION
PREDOMINANT BEDROCK
FRACTURE ORIENTATION
ASH
ASH PORE WATER
FILL
SAPROLITE
TRANSITION ZONE
BEDROCK
SURFACE WATER
SHALLOW FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
DEEP FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
BEDROCK FLOW LAYER GROUNDWATER
WELL WATER LEVEL ELEVATION
ASH PORE WATER FLOW LAYER
WATER LEVEL ELEVATION
MEAN COBALT (Co) CONCENTRATION (V6/L)
MEAN IRON (Fe) CONCENTRATION (ug/L)
MEAN MANGANESE (Mn) CONCENTRATION (ug/L)
WELL SCREEN
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN WASTE BOUNDARY
'DUKE
ENERGY
CAROLINAS
16,
s mTerra
COI NOTES:
1. ALL CONCENTRATIONS SHOWN ARE STATISTICAL MEANS
NOTES
CALCULATED BASED ON CENTRALTENDANCY OF DATASET
USING DATA RANGING FROM JANUARY 2018 TO MAY 2019.
1. WATER ELEVATIONS REPRESENT THE MAY, 2019 GAUGING
EVENT FOR EACH WELL. NOTE ELEVATIONS WITHIN EACH
(Fe
2. COBALT (Co), IRON ON (Fe ), AND MANGANESE (Mn)
CLUSTER ARE MEASURED IN THE SAME DAY. REFERENCED
CONCENTRATIONS MICROGRAMS PER LITER (Ug/L).
TO NORTH AMERICAN VERTICAL DATUM 1988.
3. WELLS WITH DATASETS CONTAINING FEWER THAN FOUR
VALID RESULTS, THE MOST RECENT VALID SAMPLE DATA UP
2. FRACTURES DEPICTED ON THIS CROSS SECTION REPRESENT
TO TUNE 2019 WAS USED.
THE GENERALIZED ORIENTATIONS OF THE PREVALENT
FRACTURE SETS OBSERVED AT THE SITE BASED ON
ANALYTICAL PARAMETER Co Fe Mn
TELEVIEWER LOGGING AT SITE -SPECIFIC BOREHOLES. THEY
ARE SHOWN WITH APPROPRIATE APPARENT DIP, WITH
REPORTING UNITS pg/L pg/L pg/L
VERTICAL EXAGGERATION. THIS CROSS SECTION IS
APPROXIMATELY PARALLEL TO THE PREDOMINANT FRACTURE
STRIKE DIRECTION. THE ACTUAL NUMBER OF FRACTURES IS
FAR TOO NUMEROUS TO ILLUSTRATE AT THIS SCALE. IN
ADDITION, THE DEPTHS AND LENGTHS OF FRACTURES
VERSUS DEPTH ARE CONCEPTUAL ONLY.
3. ALL BOUNDARIES ARE APPROXIMATE.
4. CROSS SECTION REPRESENTATIVE OF PRE -DECANTING
CONDITIONS.
GRAPHIC SCALE
0 350 700
HORIZONTAL SCALE: 1" = 700'
VERTICAL SCALE: 1" = 140'
5X VERTICAL EXAGGERATION
DRAWN BY: J. CHASTAIN DATE: 08/01/2019
REVISED BY: D. KREFSKI DATE: 12/24/2019
CHECKED BY: B. WILKER DATE: 12/24/2019
APPROVED BY: B. WILKER DATE: 12/24/2019
PROJECT MANAGER: B. WILKER DATE: 12/24/2019
www.synterracorp.com
15A NCAC 02L Standard
1* 300 50
Background Threshold Values
(Shallow Flow Zane)'
5 1095 155
Background Threshold Values
(Deep Flow Zone)'
3 225 142
Background Threshold Values
(Bedrock Flow Zone)'
3 1220 330
- UPDATED BACKGROUND THRESHOLD
VALUES (BTVs) WERE
CALCULATED USING DATA FROM BACKGROUND
GROUNDWATER SAMPLES COLLECTED FEBRUARY 2010 TO
DECEMBER 2018.
* - INTERIM MAXIMUM ALLOWABLE CONCENTRATION (IMAC)
OF THE 15A NCAC 02L STANDARD, APPENDIX 1, APRIL 1, 2013.
FIGURE 6-7c
GENERAL CROSS SECTION A -A'
VARIABLE GROUP
MEANS OF COBALT, IRON, MANGANESE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
Rev. 1
23 April 2020

O
0
■
690
L � R
s ♦ r
" ® ■ ♦ ■ ■
� _ / ♦ +`pN=1. LEGEND
O
°
(' DUKE
ENERGY
CAROLINAS
MARSHALL
STEAM STATION
600
�8D
' g1am '♦�/
azD
0 GREENWOOD RD
GRAPHIC SCALE
0 600 1,200
(IN FEET)
DRAWN BY: C. WYATT DATE: 10/25/2019
REVISED BY: C. WYATT DATE: 02/18/2020
CHECKED BY: E. WEBSTER DATE: 02/18/2020
APPROVED BY: B. WILKER DATE: 02/18/2020
PROJECT MANAGER: B. WILKER
m
NOTES:
FIGURE 6-14a
ISOCONCENTRATION MAP
CHLORIDE IN DEEP FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
Rev. 1
23 April 2020

� I /� r �•;11. ����'�: ICI 1. - -.� I ■ '�L■ + r�r
°
_...�_._.. ■L. 3
I �
f
r •.I�frl �'
I!? JJ J
r ♦ r r ■
}
' '■ / °QONFa,� LEGEND
�. /Moll'
1
sll
$ry°
1
r
rr I r
- -v
p
�%rt �,� rr�, 'rr',,/f� �:r,•j 1 �itr
�r
'Ire.
. DRYcSH
■r
(' DUKE
• ENERGY
■
■ CAROLINAS
tip
' �`• synTerra
>8a
GRAPHIC SCALE
600 0 600 1,200
(IN FEET)
DRAWN BY: C. WYATT DATE: 10/25/2019
REVISED BY: C. WYATT DATE: 02/18/2020
CHECKED BY: E. WEBSTER DATE: 02/18/2020
APPROVED BY: B. WILKER DATE: 02/18/2020
PROJECT MANAGER: B. WILKER
m
NOTES:
FIGURE 6-14b
ISOCONCENTRATION MAP
CHLORIDE IN BEDROCK FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
Rev. 1
23 April 2020

n li
Ii. •� L-.r +� l� ; r ■fir �..--•,
O
j 1 / j
�y
op 840
�
slo
J
. ♦ yr- ♦ r� '- 1
• • ►
� x
Q P 00
r
�� ► LEGEND
� rY 850
800
- II
PQ
imm
J1 ; 1
r � 1
L-�� t
�I/�
'lf
LI/
0
• '—�'
y ! f
g,0 ' • +►
r �
• r a DUKE 600
ENERGY.
J
GRAPHIC SCALE
0 600 1,200
(IN FEET)
CAROLINAS
DRAWN BY: C. WYATT
J�jp ' REVISED BY: WYATT 1 !/ CHECKED BY:: E. ATT R
_ APPROVED BY: B. WILKER
�. ' ,� ��� `. _ r♦�'• synTerra PROJECT MANAGER: B. WILKER
—� " " www.svntem
DATE: 10/25/2019
DATE: 02/18/2020
DATE: 02/18/2020
DATE: 02/18/2020
m
NOTES:
FIGURE 6-17a
ISOCONCENTRATION MAP
LITHIUM IN SHALLOW FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
Rev. 1
23 April 2020

I rr~
° 1
/Moll'
■ r� - L ■ � °.y0 � t
• ♦ r
f I�r �• ♦ r
0
i'
1 p
` ° LEGEND
rY • + g3p
` 840
l.Iq
I9IdIMIIIIV/IDIiC //' / / ) �
J , Jj
'�o,
f
L _`----------� 1, 4
0
810 �
(f�- :fJl
■
Mir
n ' 4f
(' DUKE
ENERGY
:r �. l r♦■ CAROLINAS
synTerra
t
MARSHALL
STEAM STATION
GRAPHIC SCALE
600 0 600 1,200
(IN FEET)
DRAWN BY: C. WYATT DATE: 10/25/2019
REVISED BY: C. WYATT DATE: 02/18/2020
CHECKED BY: E. WEBSTER DATE: 02/18/2020
APPROVED BY: B. WILKER DATE: 02/18/2020
PROJECT MANAGER: B. WILKER
m
NOTES:
FIGURE 6-17c
ISOCONCENTRATION MAP
LITHIUM IN BEDROCK FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
Rev. 1
23 April 2020

0
�i
0
69 l ■ ♦ ■
�..r • • •
r
♦ ■
JJ"
rft
r y
■ 85� - � �
r -
•' � Nopo`NFa' owe ,
r
LEGEND
= a�° r �
' BORROW
AREA
'-80
►ter p e a
■ r� i � '`.y r
.� i�
1 I
• t + , 12,
rc
f
.J� rjl ■
(' DUKE
ENERGY
CAROLINAS
MARSHALL
STEAM STATION
600
/•
0 GREENWOOD RD
GRAPHIC SCALE
0 600 1,200
(IN FEET)
DRAWN BY: C. WYATT DATE: 10/25/2019
REVISED BY: C. WYATT DATE: 02/18/2020
CHECKED BY: E. WEBSTER DATE: 02/18/2020
APPROVED BY: B. WILKER DATE: 02/18/2020
PROJECT MANAGER: B. WILKER
m
NOTES:
FIGURE 6-19a
ISOCONCENTRATION MAP
TOTAL RADIUM IN DEEP FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
Rev. 1
23 April 2020

+, f
1 ♦ \SHAH- �'90
/Moll'
■
LEGEND
^ JIB^�II�' � O •� / — -- —
aso �
1
� _ 11'yyy777"'LLLJJJ . r �
` ,• i
♦ cc)• .ram I
MARSHALL
STEAM STATION
;8°
(' DUKE 600 ORAPHIC SCALE600 1,200
4 ENERGY IN FEET,
CAROLINAS
DRAWN BY: C. WYATT DATE: 10/25/2019
141p REVISED BY: C. WYATT DATE: 02/27/2020
CHECKED BY: E. WEBSTER DATE: 02/27/2020
APPROVED BY: B. WILKER DATE: 02/27/2020
synTerra PROJECT MANAGER: B. WILKER
www.synterracorp.com
1
NOTES:
FIGURE 6-19b
ISOCONCENTRATION MAP
TOTAL RADIUM IN BEDROCK FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
Rev. 1
23 April 2020

O
rJ 1 1
f7J—
l{
1 7
�f%/- r l
' 1 � � e'L f ��� I: ❑
��I 1 fn
7,1)1
ICJ ��i S \ i ILJf f-
1 1
0
■
L
' MS-12 r■
i
I i
--=Y■ iit
+\. GWA-8S $3° ■,
aso � ■
■ I+ �\ BG-3S
lil
MW-4 ■ I �• I 122
�•' _ - �. �,. LEGEND
Rp
IL -IS . / �' �`5 PNpPp", • ,9 ASSESSMENT MONITORING WELL- GREATER
209 �( BG-2S THAN NC 02L STANDARD (500 mg/L)
GWA-6S 115
7Se
MW-3 y • w - . GASSESSMENT MONITORING WELL- GREATER
THAN BACKGROUND VALUE (152 mg/L)
■ ASSESSMENT MONITORING WELL
MW-7 (OB-3) BACKGROUND MONITORING WELL
63 '2 WELL
AB-11 S
3s , TDS PLUME GREATER THAN NC 02L STANDARD
FM_ W-s ♦ (500 mg/L) FROM MEAN ANALYSIS. FLOW AND
61 g2° ; TRANSPORT MODEL PREDICTED PLUME IS
USED WHERE EMPIRICAL DATA IS NOT
CCR-16S AVAILABLE.
. 78 GWA-7S as°
Sao I 123 TDS PLUME GREATER THAN BACKGROUND (152
aAD •CCR-15S �' : • :. • mg/L) FROM MEAN ANALYSIS. FLOW AND
36 _ TRANSPORT MODEL PREDICTED PLUME IS
MW-2 USED WHERE EMPIRICAL DATA IS NOT
~ GWA-10S
295 < - - • 153 AVAILABLE.
CCR-14S ASH BASIN WASTE BOUNDARY
DU °O AB-9S 491 ■ y GWA-15S - - - ASH BASIN COMPLIANCE BOUNDARY
78488
LANDFILL BOUNDARY
AB-8DU GWA-11S STRUCTURAL FILL BOUNDARY
Iti� 219 / T rr�_41 498 LANDFILL COMPLIANCE BOUNDARY
GP-2S v
111
GWA-2S
95 1S GP-3S � CP-3S
❑
• 66 135
■
.J� rjl ■
It. ,�� � _r♦ �
f •
rr �
MS-14
65
MS-13
45
7
•
;,0 ■
• MW-10S
28
AB-2S
36 MW-9S
444
CCR-5S
284
CCR-4S 7
I 277 •� y ■ /+
(' DUKE
n ENERGY®
CAROLINAS
Sao
600
' gAO
r
e
F , 12.
♦ ♦ GREENWOOD RD
GRAPHIC SCALE
0 600 1,200
(IN FEET)
DRAWN BY: C. WYATT DATE: 10/25/2019
REVISED BY: C. WYATT DATE: 02/27/2020
CHECKED BY: E. WEBSTER DATE: 02/27/2020
APPROVED BY: B. WILKER DATE: 02/27/2020
PROJECT MANAGER: B. WILKER
m
- DUKE ENERGY CAROLINAS PROPERTY LINE
TOPOGRAPHIC CONTOUR (10' INTERVAL)
GROUNDWATER FLOW DIRECTION
310- STREAM (MCKIM & CREED)
WETLAND (MCKIM & CREED)
APPROXIMATE HYDROLOGIC DIVIDE
NOTES:
1. DATA INCLUDED IN THIS FIGURE ARE THE MEAN FOR WELLS BASED ON THE CENTRAL
TENDENCY OF THE DATA SET FROM SAMPLES BETWEEN FEBRUARY 2018 AND MAY
2019. FOR WELLS WITH DATA SETS CONTAINING FEWER THAN FOUR VALID RESULTS,
THE MOST RECENT VALID SAMPLE DATA WAS USED.
2. THE 02L STANDARD FOR TDS IS 500 mg/L.
3. THE BACKGROUND VALUE FOR TDS IS 152 mg/L.
4. GROUNDWATER FLOW AND TRANSPORT TDS PLUME IS MODIFIED FROM MODEL
LAYER 8 (FALTAAND OTHERS, 2019).
5. HYDROLOGIC DIVIDE INDENT I FIED IN CSA UPDATE (SYNTERRA, 20181 AND UPDATED
GROUNDWATER FLOW AND TRANSPORT MODELING REPORT (FALTAAND OTHERS,
2019).
6. THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY
CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION. THIS MAP IS NOT TO BE
USED FOR JURISDICTIONAL DETERMINATION PURPOSES. THE WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM STREAM AND WETLAND DELINEATION
CONDUCTED BY MCKIM & CREED MARCH 2O16.
7. THE TOPOGRAPHY IS SHOWN FOR REFERENCE PURPOSES ONLY AND SHOULD NOT
BE USED FOR DESIGN OR ENGINEERING PURPOSES. TOPOGRAPHY IS OBTAINED FROM
CATAWBA COUNTY GIB WEBISTE AT https://www.catawbacountync.gov/online-
services/datasets/.
8. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS
9. AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON JULY 26, 2018.
IMAGE COLLECTED ON MARCH 30. 2018.
10. DRAWING HAS BEEN SET WITH APROJECTION OF NORTH CAROLINA STATE PLANE
COORDINATE SYSTEM RIPS 3200 (NAD83).
FIGURE 6-21a
ISOCONCENTRATION MAP
TOTAL DISSOLVED SOLIDS
IN SHALLOW FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
Rev. 1
23 April 2020

TABLES

TABLE 4-2
BACKGROUND VALUES FOR SOIL
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Constituent
Reporting
Unit
PSRG Protection
of Groundwater
2018 Background
Threshold Values'
2019 Updated
Background Threshold
Values
Piedmont Background
Threshold Value Range
PH*
S.U.
NE
4.7-6.1
4.2-7.5
2.3-9.8
Aluminum
mg/kg
110,000
56,437
56,437
25,978 - 81,619
Antimony
mg/kg
0.9
0.65
0.6
0.177 - 0.9
Arsenic
mg/kg
5.8
4.697
8.2
1.2 - 43.13
Barium
mg/kg
580
819
1,063
122.2 - 1,063
Beryllium
mg/kg
63
3.9
3.9
1.2 - 4.52
Boron
mg/kg
45
8.7
15
14.4 - 56.3
Cadmium
mg/kg
3
0.11
0.7
0.03 - 1
Calcium
mg/kg
NE
1,500
1,660
410 - 8,769
Chloride
mg/kg
NE
13
293
12 - 423
Chromium
mg/kg
3.8
32.8
406
20 - 440
Cobalt
mg/kg
0.9
53.1
63
27 - 81.68
Copper
mg/kg
700
180
120
17.4 - 216
Iron
mg/kg
150
78,228
78,228
24,500 - 85,345
Lead
mg/kg
270
82.5
95.2
7.5 - 95.23
Magnesium
mg/kg
NE
32,462
49,637
760 - 51,829
Manganese
mg/kg
65
2,872
3,388
370 - 3,388
Mercury
mg/kg
1
0.1
0.1
0.04 - 0.113
Molybdenum
mg/kg
7.1
3.5
3.5
1.83 - 12
Nickel
mg/kg
130
18.6
237
9.2 - 237
Nitrate (as N)
mg/kg
NE
0.56
29.3
0.25 - 31.2
Potassium
mg/kg
NE
29,937
35,600
427 - 35,600
Selenium
mg/kg
2.1
1.77
3.7
1.58 - 6.857
Sodium
mg/kg
NE
394
1500
338 - 1,500
Strontium
mg/kg
1,500
7.53
200
7.1 - 200
Sulfate
mg/kg
1,438A
36
293
12 - 437
Thallium
mg/kg
0.28
1.1
2.1
0.166 - 2.132
Vanadium
mg/kg
350
210
210
42 - 230.9
Zinc
mg/kg
1,200
125
125
60.5 - 325.5
Prepared by: ECW Checked by: BDW
Notes:
2018 background threshold values approved by North Carolina Department of Environmental Quality (NCDEQ) on May 23, 2018.
A - PSRG Protection of Groundwater value was calculated using the equation presented on Table 6-2.
* - Upper and lower threshold values calculated for parameter
Background threshold values were calculated using data from background unsaturated soil samples collected May 2015 to March 2017.
Z - Background threshold values were calculated using data from background unsaturated soil samples collected May 2015 to August 2018.
3 - Piedmont background threshold value ranges include the Duke Energy calculated 20174 and 2019' background threshold values from 10 Duke Energy facilities located in
the Piedmont physiographic region (Allen Steam Stations, Belews Creek Steam Stations, Buck Steam Station", Cape Fear Steam Electric Plant°, Cliffside Steam Stations, Dan
River Steam Station°, Marshall Steam Stations, Mayo Steam Electric Plants, Riverbend Steam Station", and Roxboro Steam Electric Plant).
mg/kg - milligrams per kilogram
NE - not established
S.U. - standard unit
PSRG - Preliminary Soil Remediation Goals
Page 1 of 1
Rev. 1
23 April 2020

TABLE 4-3
BACKGROUND VALUES FOR GROUNDWATER
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Constituent
Reporting
Unit
15A NCAC
02L
Standard
2018
Background Threshold Values'
2019
Updated Background Threshold
Valuesz
Piedmont
Background
Threshold Value
3
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
4.6-6.4
5.7-6.9
5.6-7.6
3.6-6.6
5.5-8.1
5.7-7.8
3.6-9
Alkalinity
mg-CaCO3/L
NE
63
204
108
69
145
110
19 - 379
Aluminum
ug/L
NE
757
128
300
1205
180
531
100 - 1,238
Antimony
pg/L
1*
1
1
1
1
1
1
0.5 - 2.9
Arsenic
ug/L
10
0.4
1
1
1
1
1
0.2 - 6.35
Barium
pg/L
700
310
127
435
580
138
840
10.52 - 840
Beryllium
pg/L
4*
0.2
0.1
0.2
0.2
0.2
1
0.0625 - 1
Bicarbonate
mg-CaCO3/L
NE
63
204
108
71
145
110
19 - 388
Boron
ug/L
700
50
50
50
50
50
50
50 -176.8
Cadmium
pg/L
2
0.08
0.08
0.08
1
0.08
1
0.08 - 1
Calcium
mg/L
NE
11
13
15
11
33
19
4- 111
Carbonate
mg-CaCO3/L
NE
5
5
5
5
5
5
5- 10
Chloride
mg/L
250
6
5
5
5
4
4
3.34 - 250
Chromium
pg/L
10
17
8
8
17
4
it
1 - 26
Chromium (VI)
Ng/L
10
6
3
4
7
6
8
0.03 - 12
Cobalt
pg/L
1*
1
2
3
5
3
3
0.088 - 88.85
Copper
ug/L
1,000
4
3
4
5
10
3
0.5 - 17.15
Fluoride
mg/L
2
---
---
---
0.5
0.3
2
0.1 - 1.8
Iron
ug/L
300
744
272
792
1,095
225
1,220
56.3 - 37,500
Lead
pg/L
15
0.3
0.1
0.2
0.4
0.3
1
0 - 2
Lithium
pg/L
NE
---
---
---
5
10
11
2 - 95.39
Magnesium
mg/L
NE
2
14
13
10
8
15
1 - 45
Manganese
pg/L
50
75
141
27
155
142
330
7- 9,170
Mercury
Ng/L
1
0.2
0.2
0.2
0.2
0.2
0.2
0.05 - 0.5
Methane
pg/L
NE
10
10
10
10
10
16
1- 2,505
Molybdenum
pg/L
NE
1
3
3
1
7
4
0.5 - 26.2
Nickel
pg/L
100
10
8
7
20
8
8
0.87 - 48
Nitrate + Nitrite
mg-N/L
NE
3
1
0.4
6
2
1
0.02 - 6.3
Potassium
mg/L
NE
S
8
1
5
5
10
1.609 - 18.8
Selenium
pg/L
20
1
1
1
1
2
1
0.5 - 2.4
Sodium
mg/L
NE
9
29
14
9
28
16
6- 190
Strontium
pg/L
NE
303
665
253
210
727
313
27 - 2,120
Sulfate
mg/L
250
4
18
18
11
24
22
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
140
183
216
152
200
195
50 - 1,200
Thallium
pg/L
0.2*
0.1
0.1
0.1
0.2
0.1
0.2
0.1 - 0.2
TOC
mg/L
NE
1
1
1
3
5
2
1- 12.3
Total Radium
pCi/L
5^
3
3
6
5
7
6
0.494 - 35
Total Uranium
pg/mL
0.03^
0.0005
0.0005
0.0005
0.0005
0.0006
0.0005
0.0002 - 0.864
Rev. 1 Page 1 of 2
23 April 2020

TABLE 4-3
BACKGROUND VALUES FOR GROUNDWATER
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
2019
15A NCAC
2018
Background Threshold Values'
Updated Background Threshold
Piedmont
Reporting
Valuesz
Background
Constituent
Unit
02L
Threshold Value
Shallow
Deep
Bedrock
Shallow
Deep
Bedrock
Standard
3
Flow
Flow
Flow
Flow
Flow
Flow
Range
Zone
Zone
Zone
Zone
Zone
Zone
Vanadium
ug/L
0.3*
6
4
16
13
4
26
0.33 - 25.8
Zinc
pg/L
1,000
22___L
17
12
32
30
21
5 - 140
Prepared by: JHU CnecKed by: Fits / bUw
Notes: Revised Feb. 28, 2020
' - BTVs were calculated using data from background groundwater samples collected September 2015 to October 2017
z - Updated BTVs 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 20174 and 2019' background threshold values from 10 Duke Energy facilities
located in the Piedmont physiographic region (Allen Steam Stations, Belews Creek Steam Stations, Buck Steam Station 4, Cape Fear Steam Electric Plant4, Cliffside
Steam Stations, Dan River Steam Station 4, Marshall Steam Stations, Mayo Steam Electric Plants, Riverbend Steam Station 4, and Roxboro Steam Electric Plants).
Background threshold values (BTVs) 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.
^ - Federal Maximum Contaminant Level
pg/L - micrograms per liter
pg/mL - micrograms per milliliter
mg/L - milligrams per liter
mg-CaCO3/L - 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 2 of 2
23 April 2020

TABLE 4-5
BACKGROUND DATASET RANGES FOR SEDIMENT
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Constituent
Reporting Unit
Background Range
pH
S.U.
5.2 - 6.7
Aluminum
mg/kg
1,100 M - 20,000
Antimony
mg/kg
<0.54 - <0.74
Arsenic
mg/kg
0.29 j - 1.4
Barium
mg/kg
4 - 74
Beryllium
mg/kg
0.055 j - 0.67
Boron
mg/kg
1.3 j - <3.2
Cadmium
mg/kg
<0.14 - <0.19
Calcium
mg/kg
42 j - 1,600
Chloride
mg/kg
3.4 j - <14
Chromium
mg/kg
0.68 -14
Chromium (III)
mg/kg
NE
Cobalt
mg/kg
<0.89 - 4.2
Copper
mg/kg
0.3 j - 15
Iron
mg/kg
710 M - 15,000
Lead
mg/kg
1.1 - 16
Magnesium
mg/kg
60 j,M - 3,800
Manganese
mg/kg
10 M - 230
Mercury
mg/kg
0.032 j - <0.099
Molybdenum
mg/kg
<2 - <2.5
Nickel
mg/kg
0.81 j - 4.8
Nitrate (as N)
mg/kg
<0.24 - <0.32
Potassium
mg/kg
110 j - 4,100
Selenium
mg/kg
<1.4 - <1.9
Silver
mg/kg
<0.5 - <0.64
Sodium
mg/kg
37 j - 96 j
Strontium
mg/kg
0.62 j - 17
Sulfate
mg/kg
<12 - <16
Sulfide
mg/kg
19.2 j - <33.1
Thallium
mg/kg
0.054 j - 0.26
Vanadium
mg/kg
3.9 - 38
Zinc
mg/kg
1.7 j - 33
Prepared by: ECW Checked by: KHG
Notes:
Background locations, including SW-7, SW-8, SW-105, SW-106, which were part of the evaluation of potential groundwater to surface water
impacts, were approved by North Carolina Department of Environmental Quality (NCDEQ).
< - Concentration not detected at or above the adjusted reporting limit.
j - estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
M - Matrix spike / matrix spike duplicate failure.
mg/kg - milligrams per kilogram
NE - not established
S.U. - standard unit
Rev. 1 Page 1 of 1
23 April 2020

TABLE 6-3
SUMMARY OF UNSATURATED SOIL SAMPLE ANALYTICAL RESULTS
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium*
Cobalt
Iron
Manganese
Molybdenum
Nickel
Selenium
Strontium
Sulfate
Thallium
Vanadium
Reporting Units
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
PSRG Protection of Groundwater
0.9
5.8
580
63
45
3
9383
3.8
0.9
150
65
7.1
130
2.1
1500
14383
0.28
350
2018 Background Threshold Values'
0.65
4.7
819
3.9
8.7
0.11
13
32.8
53
78,228
2,872
3.5
18.6
1.77
7.53
36
1.1
210
2019 Background Threshold ValueS2
0.64
8.2
1,063
3.9
15
0.72
293
406
63
78,228
3,388
3.5
237
3.7
200
293
2.1
210
Sample ID
Sample
Collection Date
Analytical Results
Background
BG-3D (1-2)
6/9/2015
<5.7
8.4
649
1.3
<57.3
<0.69
<278
420
27.4
37,600
243
<2.9
237
6.7
213
<278
<5.7
81.9
BG-3D (10-12)
6/9/2015
-<-r
5.7
1,030
0.34
- 52.9
<0.63
<262
406
28
34,300
412
<2.6
267
3.7 j
200
<262
E5.3
83.3
BGSB-GWA-02 (2-4)
8/16/2017
0.12 j,B,M
0.52 j,B
270
1.4
<15
<0.03
<2.6
19
28
44,000 M
1,300 M
<12 P4
16
0.39 j
7.8
36 M
0.54
140 M
BGSB-GWA-02 (8-10)
8/16/2017
<0.5
0.58 B
140
1.7
5.4 j
0.016 j
4 j,M
23
32
59,000
1,200
<2
10
<1.3
2.8
21
0.53
150
BGSB-GWA-02 (13-15)
8/16/2017
<0.59
0.63 B
180
1.6
<14
0.019 j
4.5 j
17
45
43,000
2,600
<2.2
17
<1.5
2.4
28
0.51
120
BGSB-GWA-02 (18-20)
8/16/2017
<0.59
0.47 j,B
180
1.5
1.6 j
0.031
3.9 j
15
70
27,000
1,900
<2.2
10
<1.5
5.3
18
0.75
120
BGSB-GWA-04 (2-4)
8/16/2017
<0.63
2.9 B
26
1.3
6.2 j
<0.032
<13
13
3.2
53,000
120
2.3 j
<12
0.44 j
0.9 j
<13
0.32
120
BGSB-GWA-04 (8-10)
8/16/2017
<0.63
1.5 B
62
2.8
5.7 j
<0.031
<13
16
6.4
61,000
240
-<4-1-
<11
0.49 j
<5.3
<13
0.23
150
BGSB-GWA-04 (13-15)
8/16/2017
<0.59
0.44 j,B
230
2.7
5.9 j
<0.03
<12
14
36
56,000
1,700-<�
5.8 j
0.38 j
<5.6
<12
0.58
140
BGSB-GWA-04 (15-17)
8/16/2017
<0.64
1.8 B
72
3.5
<14
<0.032
1.3 j
25
23
51,000
400
-<4-1-
<11
0.55 j
<5.5
<13
0.19
170
BGSB-GWA-04 (18-20)
8/16/2017
<0.56
0.94 B
140
3.2
<15
0.11
<13
16
41
65,000
1,200
-<�
<12
0.55 j
<6
<13
0.86
160
BGSB-GWA-06 (2-4)
8/16/2017
0.24 j,B
2.1 B
20
0.58
2.6 j
<0.03
<12
28
2.9
22,000
75
0.74 j
5.6
0.34 j
3.4
<12
0.31
54
BGSB-GWA-06 (8-10)
8/16/2017
<0.37
0.93 B
110
1.1
1.5 j
<0.018
<12
6.9
15
18,000
400
1.1 j
6.7
0.38 j
1.8
<12
0.63
29
BGSB-GWA-06 (11-13)
8/16/2017
<0.54
1.9 B
99
1.9
1.2 j
<0.027
1.3 j
21
21
20,000
270
0.83 j
9.6
0.63 j
4.3
<13
1.6
86
BGSB-GWA-06 (13-15)
8/16/2017
<0.46
0.68 B
33
0.59
<2.6
0.051
<11
11
40
6,000
770
3.5
4.2
<1.2
4.1
<11
0.32
5.4
BGSB-GWA-06 (18-20)
8/16/2017
<0.42
0.25 j,B
11
0.21
<2.6
<0.021
<11
0.38 j
6.3
170
32
<2.1
1 j
<1.1
2.6
<11
0.06 j
<1.1
GWA-2DA (3-5)
3/13/2017
2.9-
1 j
159
2.2
<6.6
<0.17
<63.1
10.8
22.6
38,900
361
<0.66
11.1
0.92 j
3.1
91.4
<14
97
GWA-2DA (8-10)
3/13/2017
2.
1.2 j
270
2.9
<7.2
<0.16
<59.7
16
16.7
33,400
734
<0.72
14.3
1.2 j
6
79
0.78 j
112
GWA-4D (52-53)
5/19/2015
-<-�
-<-6-
345 j+
1.8 j-
<59.8
<0.72
<293
15
23.2 j-
42,300 j-
810 j-
<3
7.1 j-
-<-6-
16.5
<293
-<-6-
128 j-
GWA-5D (27.5-29.0)
7/1/2015
�1. 9
9
490
2.6
<19.7
<0.94
<384
3.1
8.3
31,500
509
<3.9
4.5
<m.9
60.7
<384
F7.9
67.7
GWA-14S (3-5)
3/9/2017
<2.6
1.6
94.4
1.7
<6.4
<0.16
<56.1
2.4
4
18,300
334
<0.64
2.7
1.1 j
1.5
<56.1
1..3
34
GWA-14S (8-10)
3/9/2017
3.8
45.1
1.3
<7.8
<0.19
<63.1
23.2
2
46,500
219
0.4 j
11.5
1.4 j
2.3
56.5 j
E1:Fr
72.2
MAR 145 CCR Removal Verification Samples - West Finger Pond
B-04 (0-1)
05/02/2019
<0.52
0.36 j
27
0.24
<2.6
<0.13
1.8 j
11
1.1
6,600
29
<2.1
3.1
<1.3
4.4
6.9 j
0.13
29
B-04 (2-3)
05/02/2019
<0.54
<0.54
48
0.48
<2.7
<0.14
<12
13
1.3
4,000
40
<2.2
3.4
0.63 j
10
<12
0.13 j
50
B-11 (0-1)
05/02/2019
<0.53
0.99
100
0.65
<5.3
0.029 j
3.8 j
52
5.2
37,000
230
4.7
19
1.7
2.9
<12
0.3
130
B-11 (2-3)
05/02/2019
<0.48
1.2
160
0.92
<19
0.034 j
<12
72
8
57,000
370
4.4
32
1.6
2.7
<12
0.59
110
B-11 (6.5-7.5)
05/02/2019
<0.45
2.2
1,100
1.3
<8.9
0.12
3 j
53
160
66,000
5,400
2.8
56
1.2
2.3
<12
3.9
78
C-06 (0-1)
05/02/2019
<0.58
0.62
91
1
<2.9
0.031 j
4.1 j
11
9.9
16,000
650
<2.3
17
<1.5
3
8 j
0.19
31
C-06 (2-3)
05/02/2019
<0.54
0.26 j
160
0.88
<2.7
0.067 j
1.9 j
13
9.4
10,000
890
<2.1
27
0.62 j
6.2
<12
0.33
21
C-08 (0-1)
05/02/2019
<0.62
<0.62
190
1.3
<3.1
0.14 j
1.4 j
27
9.6
21,000
220
<2.5
21
0.64 j
14
7.7 j
0.14 j
59
C-08 (2-3)
05/02/2019
<0.6
<0.6
200
1
<3
0.081 j
3.4 j
34
11
29,000
290
<2.4
15
<1.6
19
<14
0.19
49
C-08 (7-8)
05/02/2019
<0.57
<0.57
270
0.96
<2.9
0.23
2.3 j
11
14
28,000
800
<2.3
11
<1.5
19
<15
0.26
54
D-10 (0-1)
05/02/2019
<0.55
<0.55
610
0.93
<5.5
<0.14
7.2 j
36
14
52,000
440
<2.2
29
0.76 j
2.1
<13
0.36
82
D-10 (2-3)
05/02/2019
<0.56
0.25 j
380
0.76
<5.6
<0.14
6.7 j
51
13
52,000
360
<2.2
21
0.81 j
2.2
7.3 j
0.21
76
D-10 (7-8)
05/02/2019
<0.51
<0.51
440
1.3
<5.1
0.061 j
3.6 j
27
11
35,000
540
<2.1
18
<1.3
4.7
6.4 j
0.28
50
D-10 (12-13)
05/02/2019
--
<0.59
780
1.9
<8.8
0.15
3 j
49
24
56,000
2,000
<2.3
35
<1.5
3.4
<13
0.65
79
D-11 (0-1)
05/02/2019
<0.5
<0.5
190
0.73
<20
<0.13
4.8 j
41
15
85,000
350
<2
26
0.66 j
4
<14
0.43
93
D-11 (2-3)
05/02/2019
<0.6
<0.6
320
1.3
<9
<0.16
4.3 j
44
17
49,000
460
<2.4
27
<1.6
2.5
<15
0.59
85
D-11 (7-8)
05/02/2019
<0.56
<0.56
250
1.2
<5.6
<0.15
2.3 j
68
14
48,000
290
<2.3
43
<1.5
2.4
<13
0.38
57
Rev. 1
Page 1 of 4
23 April 2020

TABLE 6-3
SUMMARY OF UNSATURATED SOIL SAMPLE ANALYTICAL RESULTS
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium*
Cobalt
Iron
Manganese
Molybdenum
Nickel
Selenium
Strontium
Sulfate
Thallium
Vanadium
Reporting Units
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
PSRG Protection of Groundwater
0.9
5.8
580
63
45
3
9383
3.8
0.9
150
65
7.1
130
2.1
1500
14383
0.28
350
2018 Background Threshold Values'
0.65
4.7
819
3.9
8.7
0.11
13
32.8
53
78,228
2,872
3.5
18.6
1.77
7.53
36
1.1
210
2019 Background Threshold ValueS2
0.64
8.2
1,063
3.9
15
0.72
293
406
63
78,228
3,388
3.5
237
3.7
200
293
2.1
210
Sample ID
Sample
Collection Date
Analytical Results
CAMA/Data Gap/Additional Source Areas Assessment Samples
AB-02S (6-7)
07/01/2015
<5.5
2.8 j
74
0.79
<13.7
<0.66
<262
5.3
3.4 j
10,600
125
<2.7
1.6
<5.5
24.1
<262
<5.5
21.7
AL-01 (0.5-1)
04/12/2019
<0.44
3.4
150
0.58
1.2 j
<0.11
<12
12
6.5
17,000
260
0.5 j
11
0.8 j
30
<12
0.24
38
AL-01 (2-3)
04/12/2019
<0.5
3.2
220
1.7
<7.4
0.025 j
<12
20
7.8
37,000
230
<2
15
0.82 j
74
84
0.69
77
AL-01D (32-34)
06/30/2015
<5.9
10.5
319
2.4
<14.6
<0.7
<294
1 j
6.4 j
26,200
566
<2.9
1.5 j
7.1
82.6
<294
<5.9
54
CCR-05 (0.5-1)
04/16/2019
<0.41
0.61
190
0.77
0.98 j
0.077 j
<11
14
11
20,000
540
<1.6
8.1
<1.1
26
41
0.33
47
CCR-05 (2-3)
04/16/2019
<0.41
0.54
260
0.38
1.7 j
0.065 j
10 j
14
14
38,000
780
<1.7
12
0.49 j
19
59
0.71
76
CCR-09 (0.5-1)
04/12/2019
<0.51
3.9
90
0.77
<5.1
<0.13
4.4 j
48
2.9
44,000
85
1.7 j
8
1.6
27
130
0.45
81
CCR-09 (2-3)
04/12/2019
<0.54
2.9
83
0.95
<8.1
<0.14
17
18
3.4
45,000
120
1.9 j
10
1.4
42
120
0.54
93
CP-01D (2-3)
03/15/2019
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
CP-01D (2-4)
03/15/2019
<0.59
1.7
170
1.3
<2.9
<0.15
11 j
14
7.8
25,000
350
<2.3
8.8
<1.5
34
65
0.48
57
CP-01D (4-6)
03/15/2019
<0.45
2
76
0.66
<2.3
<0.12
7.8 j
13
3.5
19,000
130
<1.8
6.3
<1.2
12
13
0.36
39
CP-01D (6-8)
03/15/2019
<0.61
1.9
44
0.8
<3
<0.16
13
16
3.1
26,000
130
<2.4
8.1
<1.6
10
77
0.4
52
CP-01D (8-10)
03/15/2019
<0.57
1.9
96
1
<2.8
<0.15
12 j
16
5.8
25,000
260
<2.3
8.5
<1.5
15
200
0.42
53
CP-02D (6-8)
03/18/2019
<0.45
0.98
130
1.2
<4.5
<0.12
2.7 j
16
8.5
25,000
730
<1.8
9.1
<1.2
21
14
0.42
49
CP-03D (0-2)
03/19/2019
0.22 j,M
4.7
100
0.73
3.6 j
0.074 j
<11
20
7.6
66,000 M
400 M
4.1
17
<1.4
27
160
0.34
32
CP-03D (2-3)
03/19/2019
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
CP-03D (2-4)
03/19/2019
<0.5
0.24 j
160
1.2
<2.5
<0.13
4.1 j
4.2
5.8
19,000
420
<2
5.4
<1.3
13
260
0.45
46
CP-03D (4-6)
03/19/2019
<0.58
1.2
140
2.3
<2.9
0.031 j
7 j
25
15
25,000
380
<2.3
10
<1.5
12
<12
0.45
60
CP-03D (6-8)
03/19/2019
<0.56
2.1
70
2.3
<2.8
0.03 j
4.3 j
5.8
6.9
21,000
310
<2.3
2.6
<1.5
6.9
<12
0.29
41
CP-03D (8-10)
03/19/2019
<0.48
0.44 j
310
1.9
<4.8
0.05 j
4.1 j
74
12
34,000
720
<1.9
40
<1.3
16
230
0.72
75
GP-01D (0-5)
03/22/2019
<0.61
5.3
310
1.1
<6.1
<0.16
4.3 j
41
6.3
36,000
170
<2.4
24
1.2 j
130
1,500
0.4
84
GP-01D (2-3)
03/20/2019
NA
<0.6
200
NA
NA
NA
8.3 j
1.9
2.7
6,800
120
NA
2.6
0.6 j
NA
<13
0.18
NA
GP-01D (5-10)
03/22/2019
<0.69
0.37 j
330
2.1
<6.9
<0.18
6.7 j
76
18
52,000
400
<2.8
76
1.2 j
130
<13
0.65
97
GP-01D (10-15)
03/22/2019
<0.6
<0.62
970
1
<3
<0.16
5.9 j
130
18
38,000
390
<2.4
90
1.4 j
88
<13
0.77
16
GP-01D (15-20)
03/22/2019
<0.56
NA
NA
2.2
<8.4
<0.15
NA
NA
NA
NA
NA
<2.3
NA
NA
72
NA
NA
99
GP-01D (20-25)
03/22/2019
<0.62
0.56
300
3.4
<9.3
<0.16
3.5 j
110
45
33,000
880
<2.5
120
<1.5
390
<12 M
0.77
80
GP-01D (25-30)
03/22/2019
<0.56
0.33 j
400
2.3
<5.6
0.091 j
3.3 j
170
23
47,000
540
<2.2
120
<1.4
73
<11
0.82
79
GP-01D (30-35)
03/22/2019
<0.53
0.42 j
330
2.1
<7.9
0.04 j
2.9 j
160
16
49,000
330
<2.1
110
0.59 j
76
<13
0.65
82
GP-01D (35-40)
03/22/2019
<0.61
0.29 j
1 530
2.3
<9.1
<0.16
3.2 j
12
14
31,000
580
<2.4
16
0.87 j
75
<12
0.79
87
GP-01D (40-45)
03/22/2019
<0.49
0.47 j
210
3.5
<4.9
0.041 j
<12
53
7.9
21,000
430
<2
32
0.52 j
200
<12
0.41
87
GP-01D (45-50)
03/22/2019
<0.48
NA
NA
2.2
1.1 j
0.086 j
NA
NA
NA
NA
NA
<1.9
NA
NA
120
NA
NA
56
GP-01D (47-49)
03/22/2019
NA
1.6
460
NA
NA
NA
14 j
16
8.5
46,000
420
NA
14
1.4 j
NA
300
0.72
NA
GP-02D (0-5)
03/29/2019
<0.6
0.89
100
1.1
<9
<0.16
3.3 j
18
4
39,000
250
<2.4
11
0.81 j
28
390
0.34
91
GP-02D (5-10)
03/29/2019
<0.57
<0.59
590
1.7
<5.7
<0.15
1 7 j
46
11
30,000
750
<2.3
34
<1.5
130
270
0.73
90
GP-02D (15-20)
03/29/2019
<0.59
<0.49
240
3.4
<5.9
0.086 j
<12
8.3
2.6
13,000
500
<2.4
4.7
0.68 j
280
110
0.33
66
GP-02D (20-25)
03/29/2019
<0.49
0.61
280
1.6
1.4 j
0.033 j
1 9.4 j
13
8.8
39,000
520
<2
10
1.2 j
150
11 j
0.53
24
Rev. 1
Page 2 of 4
23 April 2020

TABLE 6-3
SUMMARY OF UNSATURATED SOIL SAMPLE ANALYTICAL RESULTS
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium*
Cobalt
Iron
Manganese
Molybdenum
Nickel
Selenium
Strontium
Sulfate
Thallium
Vanadium
Reporting Units
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
PSRG Protection of Groundwater
0.9
5.8
580
63
45
3
9383
3.8
0.9
150
65
7.1
130
2.1
1500
14383
0.28
350
2018 Background Threshold Values'
0.65
4.7
819
3.9
8.7
0.11
13
32.8
53
78,228
2,872
3.5
18.6
1.77
7.53
36
1.1
210
2019 Background Threshold ValueS2
0.64
8.2
1,063
3.9
15
0.72
293
406
63
78,228
3,388
3.5
237
3.7
200
293
2.1
210
Sample ID
Sample
Collection Date
Analytical Results
GP-03D (0-5)
03/25/2019
<0.56 M
0.28 j
320
1.4
<5.9
<0.14
2.8 j
4.6 B
7
36,000 B,M
470
<2.4
3.9
1.6
75
110 M
0.75
76
GP-03D (2-3)
03/25/2019
NA
<0.64
1100
NA
NA
NA
6.6 j
57 B
39
23,000 B
1,100
NA
50
2.8
NA
860
0.71
NA
GP-03D (5-10)
03/25/2019
<0.62
0.8
720
2.3
4 j
<0.16
9.1 j
62 B
140
28,000 B
4,300
<2.5
58
1.5 j
30
670
1.9
120
GP-03D (10-15)
03/25/2019
<0.64
0.99
320
3.1
<3.2
0.049 j
6.9 j
180 B
16
38,000 B
610
<2.6
49
1.7
320
680
0.44
56
GP-03D (15-20)
03/25/2019
<0.6
NA
NA
2.5
<3
0.25
NA
NA
NA
NA
NA
<2.4
NA
NA
180
NA
NA
71
GP-03D (20-25)
03/25/2019
<0.57
<0.62
450
2.9
2.6 j
0.053 j
6.1 j
290 B
23
65,000 B
480
<2.3
160
3.4
110
670
0.96
64
GWA-01BR (8-10)
06/26/2015
<5.7
NA
NA
1.9
<14.3
<0.69
NA
NA
NA
NA
NA
<2.9
NA
NA
19.8
NA
NA
30.4
GWA-01BR (14-15.5)
06/26/2015
NA
<6.2
118
NA
NA
NA
<297
13.4
7.1
18,100
192
NA
9.5
<6.2
NA
<297
<6.2
NA
GWA-01BR (18-20)
06/26/2015
<6.2
<5.7
128
1.4
<15.5
<0.74
<302
6
9.1
16,000
529
<3.1
5.3
<5.7
12.2
<302
<5.7
46.7
GWA-07 (0.5-1)
04/12/2019
<0.43
0.76
99
0.68
<2.1
<0.11
<11
51
11
13,000
550
<1.7
24
0.49 j
28
<11
0.21
30
GWA-07 (2-3)
04/12/2019
<0.51
2
140
0.8
<2.5
<0.13
<12
92
13
22,000
500
<2
41
0.49 j
46
41
0.37
52
ILF-01BR (0-5)
03/13/2019
<0.63 M
1.9
150
2
3.3
<0.16
8.7 j
22
6.6
28,000 M
220
0.68 j
11
0.62 j,M
64 M
49
0.41
70
ILF-01BR (5-10)
03/13/2019
<0.56
<0.47
82
1.2
2.7 j
<0.15
1.9 j
2
3.7
14,000
460
0.59 j
1.3 j
<1.2
22
<11
0.26
50
ILF-01BR (10-15)
03/13/2019
<0.47
<0.47
100
1.1
<2.3
<0.12
3 j
2.1
3.8
16,000
360
<1.9
1.4 j
<1.2
27
<11
0.31
23
ILF-01BR (15-20)
03/13/2019
<0.47
0.5
140
0.91
0.96 j
0.028 j
2.1 j
12
4
19,000
400
<1.9
5.5
<1.3
25
<11
0.38
26
ILF-01BR (20-25)
03/13/2019
<0.49
0.23 j
220
0.85
1.1 j
0.024 j
3.3 j
11
6.5
22,000
380
<2
5.2
<1.3
33
<11
0.47
32
ILF-01BR (25-30)
03/13/2019
<0.49
0.47
300
0.53
1.4 j
0.065 j
2.5 j
17
9.7
32,000
420
<1.9
7.8
<1.2
33
<11
0.55
56
ILF-01BR (30-35)
03/13/2019
<0.47
0.66
160
0.77
<4.7
0.041 j
5.7 j
12
6.1
23,000
380
<1.9
7.3
<1.5
63
6.3 j
0.36
71
ILF-02D (7-10)
03/31/2019
<0.59
<0.58
340
1.5
<5.9
<0.15
5.3 j
21
14
38,000
760
<2.4
8.3
0.61 j
22
<13
0.91
72
ILF-02D (10-15)
03/31/2019
<0.58
0.3 j
370
1.6
<5.8
0.049 j
6.3 j
20
12
29,000
590
<2.3
14
<1.6
20
<13
0.61
76
ILF-02D (15-20)
03/31/2019
<0.63
<0.53
310
1.1
2.9 j
<0.16
3.2 j
15
8.1
29,000
460
<2.5
6.7
0.52 j
25
<11
0.77
67
ILF-02D (20-25)
03/31/2019
<0.53
0.46 j
180
1.6
<7.9
0.026 j
<12
13
8
30,000
620
<2.1
5
<1.4
26
<12
0.32
66
ILF-02D (25-30)
03/31/2019
<0.55
<0.58
320
2.4
<8.2
0.1 j
3.2 j
18
9.8
34,000
510
<2.2
7.3
<1.5
44
<12
0.63
62
ILF-02D (30-35)
03/31/2019
<0.58
<0.55
290
2.1
<5.8
0.056 j
2.9 j
16
8.1
28,000
490
<2.3
6.3
<1.4
44
<12
0.56
67
ILF-02D (35-40)
03/31/2019
<0.55
<0.59
280
2.3
<5.5
0.14
6.7 j
21
9.7
34,000
530
<2.2
8.9
0.66 j
39
<13
0.85
62
MW-05 (0.5-1)
04/12/2019
<0.59
3.1
160
1.6
<8.8
<0.15
3.3 j
22
8.3
38,000
150
<2.4
15
0.75 j
120
100
0.42
79
MW-05 (2-3)
04/12/2019
<0.49
1.5
170
1.4
<7.4
<0.13
11 j
12
6.3
32,000
220
<2
9.3
0.64 j
120
<13 M
0.41
50
MW-10 (0.5-1)
04/12/2019
<0.6
1.7
88
1.3
<6
<0.16
2.8 j
110
6
35,000
190
<2.4
79
0.98 j
9.5
56
0.45
68
MW-10 (2-3)
04/12/2019
<0.63 M
0.91 M
150
1.3
<5.7
<0.16
114
61
6.4
33,000 M
360 M
<2.3 M
48
0.79 j
6.9
<13
0.65
64 M
MW-14BR (31.5-33)
07/10/2015
<6.5
<6.5
828
6.3
<3.3
<0.78
<329
61.9
16.8
50,400
421
3
45.2
<6.5
19.1
<329
<6.5
128
PVSF-01BR (2-4)
03/18/2019
<0.46
0.53 j
630
1.3
<6.9
<0.12
3.2 j
3.7
17
42,000
650
<1.8
5.7
<1.4
450
130
0.68
86
PVSF-01BR (4-6)
03/18/2019
<0.46
0.7
530
1
<6.9
<0.12
3.8 j
8.6
11
53,000
490
<1.8
7.4
<1.4
120
150
0.66
94
PVSF-01BR (8-10)
03/18/2019
<0.64 M
0.67
570
1.2
<5.1
<0.17
5.9 j
2
13
50,000
530
<2.1
4.5
0.49 j
310 M
85 M
0.6
69
PVSF-01BR (10-12)
03/18/2019
<0.55
0.39 j
730
1
<8.3
0.041 j
5.7 j
6.1
11
39,000
440
<2.2
6.5
<1.3
290
<12
0.5
93
PVSF-01BR (12-14)
03/18/2019
<0.55
0.37 j
740
1.3
<8.2
<0.14
4.5 j
4.3
21
35,000
710
<2.2
5.5
0.51 j
160
<11 M
0.55
120
PVSF-01BR (14-16)
03/18/2019
<0.49
0.44 j
500
1.2
<7.4
<0.13
6.7 j
1.8
13
43,000
520
<2
3.7
<1.3
230
1 <12
0.7
110
PVSF-01BR (16-18)
03/18/2019
<0.5
0.52
590
2
<5
<0.13
5.3 j
4.1
15
44,000
580
<2
5
<1.1
260
<12
0.61
96
PVSF-01BR (18-20)
03/18/2019
<0.45
1.4
630
1.9
<4.5
0.041 j
3.6 j
10
6.5
45,000
360
<1.8
12
0.72 j
290
330
0.5
75
PVSF-01BR (20-22)
03/18/2019
<0.5
0.48
690
1.6
<7.5
<0.13
5.5 j
1.9
58
37,000
2,500
<2
3.4
<1.2
70
<11 M
0.72
92
PVSF-01BR (22-24)
03/18/2019
<0.43
0.37 j
780
1.7
<6.4
0.027 j
8.6 j
2.9
14
40,000
530
<1.7
4
<1.3
160
<13
0.6
92
PVSF-01BR (24-26)
03/18/2019
<0.47
0.56
1 680
1.9
<7.1
0.031 j
5.8 j
1.6
42
53,000
1,900
0.52 j
8.1
<1.2
1 260
1 <11
1.1
80
Rev. 1
Page 3 of 4
23 April 2020

TABLE 6-3
SUMMARY OF UNSATURATED SOIL SAMPLE ANALYTICAL RESULTS
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium*
Cobalt
Iron
Manganese
Molybdenum
Nickel
Selenium
Strontium
Sulfate
Thallium
Vanadium
Reporting Units
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
PSRG Protection of Groundwater
0.9
5.8
580
63
45
3
9383
3.8
0.9
150
65
7.1
130
2.1
1500
14383
0.28
350
2018 Background Threshold Values'
0.65
4.7
819
3.9
8.7
0.11
13
32.8
53
78,228
2,872
3.5
18.6
1.77
7.53
36
1.1
210
2019 Background Threshold ValueS2
0.64
8.2
1,063
3.9
15
0.72
293
406
63
78,228
3,388
3.5
237
3.7
200
293
2.1
210
Sample ID
Sample
Collection Date
Analytical Results
PVSF-01BR (26-28)
03/18/2019
<0.49
0.33 j
520
1.7
<7.4
0.025 j
6.1 j
4.7
9.7
41,000
470
<2
3.5
<1.4
350
<13
0.5
89
PVSF-01BR (28-30)
03/18/2019
<0.47
0.51
570
1.6
<12
0.12
5.2 j
5
11
41,000
510
0.6 j
4.1
<1.2
160
<11 M
0.49
100
PVSF-01BR (30-32)
03/18/2019
<0.52
0.52
520
1.6
<5.2
<0.14
3.9 j
2.6
12
41,000
610
<2.1
3.5
<1.1
170
<11
0.55
85
PVSF-01BR (32-34)
03/18/2019
<0.46
0.79
420
1.6
<6.8
0.024 j
11 j
6.1
8.7
48,000
390
<1.8
7.5
0.49 j
200
<12
0.57
82
PVSF-01BR (34-36)
03/18/2019
<0.44
4.9
560
1.5
1<6.6
0.047 j
7.6 j
3.8
6.6
35,000 M
320 M
<1.8
5.1
1 j
160
150
1 0.45
84
PVSF-03BR (0-2)
03/26/2019
<0.64
2.9
64
1.2
5.9 j
0.039 j
NA
47
5.6
67,000
130
2.7
21
1.1 j
3.1
130
0.35
180
PVSF-03BR (2-3)
03/26/2019
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
PVSF-03BR (2-4)
03/26/2019
<0.7
1.3
83
1.2
5.5 j
0.036 j
NA
35
7
79,000
350
0.7 j
18
0.93 j
1.1 j
11 j
0.25
180
PVSF-03BR (4-6)
03/26/2019
<0.66
0.95
73
1.1
5.6 j
0.049 j
NA
37
9.3
76,000
290
<2.6
18
0.69 j
0.61 j
<15
0.16 j
190
PVSF-03BR (6-8)
03/26/2019
<0.74
0.56 j
63
1.2
<18
0.08 j
NA
38
20
85,000
600
<2.9
16
<1.9
0.38 j
9.4 j
0.1 j
190
PVSF-03BR (8-10)
03/26/2019
<0.75
0.54 j
66
1.3
4.4 j
0.096 j
NA
32
29
67,000
850
<3
17
<1.9
<1.5
12 j
0.095 j
180
PVSF-04D (2-3)
07/24/2019
<0.57
0.79
190
1.2
<8.7
<0.15
2.7 j
62
5
53,000
68
1 j
23
0.61 j
2.7
<12 M
0.9
81
PVSF-04D (7-8)
07/24/2019
<0.58
0.27 j
440
3
<12
0.047 j
6.6 j
59
12
54,000
390
4.3
41
0.77 j
3.8
<12
1.1
130
PVSF-04D (12-13)
07/24/2019
<0.58
0.91
350
2.3
<6.1
0.034 j
4.5 j
60
14
52,000
320
2.3 j
27
<1.5
7.4
6.6 j
1.2
90
PVSF-04S (15-16)
07/24/2019
<0.55
0.34 j
130
1.1
<2.4
<0.14
<12
4.8
3.6
11,000
230
0.54 j
4.9
<1.4
46
75
0.42
20
SS-01 (0.5-1)
04/16/2019
<0.5 M
0.5
340
2.6
<5.6
0.036 j
5.3 j
27
9
36,000 M
510 M
<2.3
17
1.3
120
63
0.5
81
SS-01 (2-3)
04/16/2019
<0.6 M
0.32 j,M
310
1.9
<4.8
0.041 j
16
11
23 M
36,000 M
570 M
<1.9 M
11
0.62 j
86
480
0.58
78 M
Prepared by: BDW/ECW Checked by: KHG
Notes:
1 - Background threshold values were calculated using data from background unsaturated soil samples collected May 2015 to March 2017.
z - Background threshold values were calculated using data from background unsaturated soil samples collected May 2015 to August 2018.
3 - The PSRG POG displayed was calculated in accordance with Table 6-2 presented in the CAP Update Report text.
0 - bold highlighted concentration indicates value is greater than applicable regulatory standard (PSRG POG)
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
PSRG - Preliminary Soil Remediation Goals for the Protection of Groundwater (POG); NCDEQ Inactive Hazardous Sites Branch (IHSB) Preliminary Soil Remediation Goals Table (February 2018)
* - North Carolina PSRG POG is for hexavalent chromium, soil analytical is for total chromium.
< - Concentration not detected at or above the adjusted reporting limit.
mg/kg - milligrams per kilogram
7..9 - Strike -through indicates that the non -detect was omitted from the dataset because the reporting limit for the non -detect was greater than the protection of groundwater preliminary soil remediation goal.
B - Target analyte detected in method blank at or above the reporting limit. Target analyte concentration in sample is less than 10X the concentration in the method blank. Analyte concentration in sample could be due to blank contamination.
j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
j- - Estimated concentration, biased low.
j+ - Estimated concentration, biased high.
M - Matrix spike / matrix spike dup failure.
NA -Not analyzed
Rev. 1
Page 4 of 4
23 April 2020

TABLE 6-5
MEANS OF GROUNDWATER COIs - FEBRUARY 2018 TO MAY 2019
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Molybdenum
Nickel
Selenium
Strontium
Sulfate
Thallium
Total Dissolved
Solids
Total Radium
Vanadium
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
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/L
15A NCAC 02L Standard
1*
10
700
4*
700
2
250
SO
SO
1*
300
NE
50
NE
100
20
NE
250
0.2*
Soo
NE
0.3*
2018 Background Threshold Values (Shallow Flow Zone)'
0.5
0.4
310
50
0.08
5.5
5.7
16.5
1.2
744
75.3
0.5
9.9
1
303
4.2
0.1
140
3.0
5.6
2019 Background Threshold Values (Shallow Flow Zone)
1
1
580
0.2
50
1
5
7
17
5
1095
5
155
1
20
1
210
11
0.2
152
5
13
Background Data Set Range (Shallow Flow Zone)
0.1 j - 1.12
0.043 j - 1.7
22.2 - 730
0.012 j - 0.61
3.3 - 56.7
0.052 j - 0.101
0.92- 5.4
0.076 j - 7.1
0.1 j - 39.2
0.041 j - 5.2
28 - 3440
0.19 j - 5.6
1.46 j - 390
0.076 j - 1.4
0.28 j - 21.9
0.092 - 0.72
9 - 223
0.0447 j - 12.8
0.015 j - 0.024
10- 144
0.049 - 6.73
0.077 j - 15.4
2018 Background Threshold Values (Deep Flow Zone)'
0.5
0.6
127
0.1
50
0.08
4.7
3
7.6
1.9
272
---
141
3.2
7.5
1
665
17.7
0.1
183
2.8
3.8
2019 Background Threshold Values (Deep Flow Zone)
1
1
138
0.2
50
0.08
4
6
4
3
225
SO
142
7
8
2
727
24
0.1
200
7
4
Background Data Set Range (Deep Flow Zone)
0. 14j-1.3
0.088j-1.9
15.1-146
0.012 j-0.095j
2.3j-43j
0.03j-0.054j
1.2-4.8
0.01 j-2.7
0.15j-3.1
0.013 j-3.3
30.4j-310
2.5-10.9
7.4-154
0.19 j-10.5
0.13 j-7.9
0.17 j-2.9
81.4-732
2.3-35.4
0.018 j-0.054j
41-202
0.2587-11.14
0.74-4
2018 Background Threshold Values (Bedrock Flow Zone)'
0.5
0.6
435
0.2
50
0.08
4.5
3.9
8.3
2.8
792
---
26.6
3.0
7.2
1
253
18.4
0.1
216
5.7
16.0
2019 Background Threshold Values (Bedrock Flow Zone)
1
1
840
1
1
4
8
11
3
1220
11
330
4
8
1
313
22
0.2
195
6
26
Background Data Set Range (Bedrock Flow Zone)
0.11- 1.25
0.071 j - 2.3
23 - 857
0.01 j - 1.8
�j49,1
0.014 j - 1.9
1.2 - 4
0.012 j - 11.8
0.23 j - 31
0.026 j - 3.9
16- 1530
3.8- 11
2.8 j - 385
0.13 j - 6.2
0.33 j - 22.8
0.17 j - 2.3
140 - 407
0.42 j - 23.9
0.016 j - 0.069 j
42 - 240
4.6E-0 5j1- 1.5E
0.099 j -26.6
Sample ID Flow Zone
Analytical Results
Background Locations
BG-01S
Shallow
< 0.5
0.10
48
< 0.1
< 50
< 0.08
3.0
3.3
4.3
0.20
324
< 0.5
7.5
< 0.5
3.8
< 0.5
111
8.3
< 0.1
88
0.51
0.88
BG-01D
Deep
< 0.5
0.16
132
< 0.1
< 50
< 0.08
3.1
2.7
2.8
0.20
81
10.0
11
< 0.5
5.0
2.3
689
9.1
< 0.1
137
2.3
3.5
BG-01BRA
Bedrock
< 0.5
0.18
441
< 0.1
< 50
< 0.08
2.4
2.4
2.9
0.26
110
6.6
22
0.59
2.3
< 0.5
197
2.1
< 0.1
146
2.3
18
BG-02S
Shallow
< 0.5
0.14
294
< 0.1
< 50
< 0.08
1.7
4.7
5.6
0.10
407
4.5
5.5
< 0.5
3.9
< 0.5
179
5.8
< 0.1
115
1.2
8.3
BG-02BR
Bedrock
< 0.5
0.17
468
< 0.1
< 50
< 0.08
2.4
7.9
7.1
< 0.1
< 50
8.3
< 5
< 0.5
1.0
< 0.5
239
2.9
< 0.1
153
5.1
14
BG-03S
Shallow
< 0.5
0.23
426
< 0.1
< 50
< 0.08
1.8
5.9
8.9
0.25
414
4.3
6.7
< 0.5
11
< 0.5
126
8.5
< 0.1
122
0.85
6.3
BG-03D
Bedrock
< 0.5
0.38
788
< 0.1
< 50
< 0.08
2.6
5.3
5.1
< 0.1
52
7.3
< 5
< 0.5
4.7
< 0.5
156
11
< 0.1
181
0.99
25
BG-03BR
Bedrock
< 0.5
0.46
65
< 0.1
< 50
0.08
2.5
3.8
5.7
0.41
620
10
11
1.8
5.2
< 0.5
180
11
< 0.1
181
1.4
16
GWA-04D
Deep
< 0.5
0.81
27
< 0.1
< 50
< 0.08
3.3
0.10
0.57
< 0.1
51
3.7
66
4.3
0.59
< 0.5
139
7.8
< 0.1
179
1.2
1.3
GWA-04S
Shallow
< 0.5
0.13
33
< 0.1
< 50
< 0.08
3.6
0.93
2.0
0.15
394
0.86
12
< 0.5
1.0
< 0.5
40
< 1
< 0.1
61
0.55
0.50
GWA-05D
Deep
< 0.5
0.12
17
< 0.1
< 50
< 0.08
1.5
0.42
0.57
< 0.1
< 50
3.0
< 5
< 0.5
< 0.5
< 0.5
84
2.6
< 0.1
66
1.1
1.5
GWA-06D
Bedrock
< 0.5
0.17
25
< 0.1
56
< 0.08
2.9
0.66
0.94
0.54
116
6.1
24
0.73
0.89
< 0.5
234
7.6
< 0.1
104
0.38
1.5
GWA-06S
Shallow
< 0.5
0.23
62
0.12
51
< 0.08
2.9
0.45
1.1
< 0.1
393
0.63
11
< 0.5
1.0
< 0.5
56
< 1
< 0.1
54
0.77
0.54
GWA-08D
Bedrock
< 0.5
0.22
31
< 0.1
< 50
< 0.08
2.7
0.42
0.88
< 0.1
190
5.7
11
< 0.5
0.54
< 0.5
176
< 1
< 0.1
83
-
3.4
GWA-08S
Shallow
< 0.5
0.11
27
< 0.1
< 50
< 0.08
4.7
1.0
4.6
0.14
268
3.1
7.6
< 0.5
1.2
0.57
203
3.4
< 0.1
77
-
3.5
GWA-12BR
Bedrock
< 0.5
0.34
29
< 0.1
< 50
< 0.08
1.5
0.04
< 0.5
1.2
328
9.1
250
2.2
2.0
< 0.5
180
21
< 0.1
112
1.4
< 0.3
GWA-12S
Shallow
< 0.5
0.11
44
< 0.1
< 50
< 0.08
2.6
0.58
0.83
0.35
73
0.59
16
< 0.5
1.2
< 0.5
10
3.9
< 0.1
30
1.1
< 0.3
MS-10
Shallow
< 0.5
< 0.1
111
0.22
< 50
< 0.08
1.2
0.70
1.0
0.62
236
2.3
22
< 0.5
1.4
< 0.5
16
< 1
< 0.1
28
1.5
0.54
MW-04
Shallow
< 0.5
0.15
52
< 0.1
< 50
< 0.08
1 1.9
1.6
2.3
1 < 0.1
73
0.86
< 5
< 0.5
0.8
< 0.5
103
< 1
< 0.1
55
0.88
1.1
MW-04D
Bedrock
< 0.5
0.13
41
< 0.1
< 50
< 0.08
1 1.4
0.38
0.54
1 < 0.1
58
4.3
< 5
< 0.5
< 0.5
< 0.5
195
1.3
< 0.1
84
0.79
2.6
Shallow Flow Zone
AB-01S
Shallow
< 0.5
1.9
58
0.72
3978
0.28
169
0.06
0.92
14
715
1.4
2819
0.64
1.5
1.7
711
106
0.34
556
3.1
1.6
AB-02S
Shallow
< 0.5
0.18
33
< 0.1
< 50
< 0.08
3.1
0.03
0.96
16
1298
< 0.5
845
< 0.5
0.96
< 0.5
12
3.0
0.19
36
1.0
< 0.3
AB-05DU
Shallow
< 0.5
0.29
302
< 0.1
40
0.20
3.9
< 0.025
0.63
44
2765
9.9
4220
0.24
13
< 0.5
1595
52
< 0.1
248
1.4
1.5
AB-07DU
Shallow
< 0.5
1.3
166
0.06
107
< 0.08
2.8
< 0.025
2.7
8.5
3088
5.1
397
0.81
11
< 0.5
916
14
< 0.1
169
0.91
1.3
AB-08DU
Shallow
< 0.5
0.37
190
< 0.1
78
< 0.08
3.9
0.06
1.4
2.6
1156
3.4
466
0.51
9.4
< 0.5
1223
68
< 0.1
219
0.77
0.34
AB-09S
Shallow
< 0.5
0.50
37
< 0.1
48
< 0.08
1.7
0.50
4.7
1.1
1095
< 0.5
143
< 0.5
4.4
< 0.5
72
11
0.14
78
-
1.2
AB-11S
Shallow
< 0.5
0.24
12
< 0.1
< 50
< 0.08
1.9
0.34
0.64
0.66
166
0.97
62
< 0.5
< 0.5
< 0.5
43
< 1
< 0.1
35
-
0.58
AB-14DU
Shallow
< 0.5
0.19
118
< 0.1
95
< 0.08
1.8
0.97
3.1
1.2
178
2.3
214
0.49
1.3
< 0.5
281
17
< 0.1
109
0.47
1.8
AB-16DU
Shallow
< 0.5
0.75
182
< 0.1
< 50
< 0.08
8.2
0.03
1.1
15
1211
5.4
623
2.0
7.3
< 0.5
776
18
< 0.1
232
0.64
1.5
AB-16S
Shallow
< 0.5
7.4
107
< 0.1
99
< 0.08
2.3
0.03
0.54
18
60900
0.55
1940
0.53
3.7
0.57
302.5
21
< 0.1
179
-
0.74
AL-01S
Shallow
< 0.5
1.2
83
4.6
3978
0.45
190
0.16
3.3
6.0
374
7.1
1796
< 0.5
2.7
1.4
2182
94
0.20
511
2.3
0.39
AL-02S
Shallow
< 0.5
0.30
40
1.0
12633
0.91
1.9
1.1
2.5
0.29
124
5.6
282
0.51
19
87
5530
1433
< 0.1
2422
-
0.87
CCR-01S
Shallow
< 0.5
0.18
99
0.35
< 25
< 0.08
4.0
< 0.025
< 0.5
2.9
81
< 2.5
382
< 0.5
1.3
< 0.5
125
0.87
< 0.1
81
0.85
1.2
CCR-02S
Shallow
< 0.5
0.12
68
0.13
125
0.09
6.3
0.05
< 0.5
8.2
43
< 2.5
684
< 0.5
1.2
< 0.5
59
9.4
0.11
62
0.93
0.87
CCR-03S
Shallow
< 0.5
0.11
32
0.13
< 50
0.09
3.1
0.37
0.70
0.21
25
< 2.5
1.2
< 0.5
< 0.5
< 0.5
< 1
< 0.1
39
0.79
0.73
CCR-04S
Shallow
< 0.5
0.74
88
0.74
287
0.65
9.3
-
< 0.5
116
-
1.6
-
< 0.5
-
0.52
-
136
0.70
277
1.5
-
CCR-05S
Shallow
< 0.5
0.66
110
0.06
177
< 0.08
12
-
< 0.5
0.92
-
0.44
-
0.31
-
< 0.5
-
80
< 0.1
284
1.5
-
CCR-09S
Shallow
0.52
1.0
129
2.2
3805
0.70
174
1.4
3.0
111
68
6.8
3835
< 0.5
3.7
1.2
116
88
0.27
464
1.2
< 0.3
CCR-11S
Shallow
< 0.5
2.5
49
1.1
5037
0.17
201
-
0.88
62
-
6.9
-
< 0.5
-
1.5
-
98
3.0
343
2.4
-
CCR-12S
Shallow
< 0.5
1 1.2
965
5.0
3897
0.89
226
-
1.3
83
-
1.7
-
< 0.5
-
0.61
-
24
0.70
476
7.6
-
CCR-13S
Shallow
< 0.5
50
109
< 0.1
1 3263
< 0.08
136
< 0.025
0.72
9.8
7050
37
2910
42
2.7
< 0.5
167
0.37
824
1.9
< 0.3
CCR-14S
Shallow
< 0.5
0.64
499
0.89
3780
0.18
235
-
1.1
9.9
-
0.71
-
< 0.5
-
< 0.5
-
59
0.15
491
5.8
-
CCR-15S
Shallow
< 0.5
0.16
12
0.16
5.6
< 0.08
1.8
-
2.4
0.38
-
0.43
-
< 0.5
-
< 0.5
-
0.87
< 0.1
36
0.63
-
CCR-16S
Shallow
< 0.5
0.19
45
0.15
10
< 0.08
4.3
-
1.3
0.63
-
0.73
-
< 0.5
-
0.60
-
20
< 0.1
78
0.44
-
CP-015
Shallow
0.11
3.2
30
5.4
218
0.86
11
0.07
0.58
274
69167
8.9
4383
< 0.5
56
2.8
514
304
1.3
638
0.80
0.50
CP-02S
Shallow
< 0.5
0.16
21
< 0.1
< 50
< 0.08
2.9
0.05
< 0.5
27
12313
< 2.5
1877
1.5
2.0
< 0.5
65
1 1.5
0.06
277
0.94
0.31
CP-03S
Shallow
< 0.5
0.11
93
0.10
111
< 0.08
12
0.45
2.2
0.51
73
2.7
91
0.44
1.9
0.38
97
39
< 0.1
135
0.73
0.24
GP-01S
Shallow
0.18
0.20
80
0.07
< 50
< 0.08
1.9
0.64
5.3
0.94
128
< 2.5
94
0.66
9.5
< 0.5
223
5.5
< 0.1
95
1.1
1.8
GP-02S
Shallow
< 0.5
0.12
124
0.10
< 50
< 0.08
1.8
1.9
2.7
0.89
263
< 2.5
54
0.21
0.93
0.97
609
19
< 0.1
111
1.7
0.77
GP-03S
Shallow
< 0.5
0.08
49
< 0.1
< 50
< 0.08
2.9
0.04
< 0.5
0.48
< 50
< 2.5
52
0.53
0.74
< 0.5
106
2.3
< 0.1
66
1.0
0.45
GWA-01S
Shallow
0.52
< 0.1
49
0.71
< 50
< 0.08
2.9
0.48
0.89
0.54
116
1.3
16
< 0.5
0.62
1.5
33
9.4
< 0.1
60
0.88
0.41
GWA-02S
Shallow
< 0.5
0.15
68
0.18
< 50
0.08
1.5
2.5
3.5
0.58
78
< 2.5
44
< 0.5
1.3
0.90
29
34
0.11
111
0.52
0.33
GWA-03S
Shallow
< 0.5
< 0.1
32
0.30
< 50
< 0.08
2.1
0.31
0.53
< 0.1
147
1.6
12
< 0.5
< 0.5
< 0.5
41
0.85
< 0.1
67
-
0.63
Rev. 1 Page 1 of 4
23 April 2020

TABLE 6-5
MEANS OF GROUNDWATER COIs - FEBRUARY 2018 TO MAY 2019
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Molybdenum
Nickel
Selenium
Strontium
Sulfate
Thallium
Total Dissolved
Solids
Total Radium
Vanadium
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
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/L
15A NCAC 02L Standard
1*
10
700
4*
700
2
250
SO
SO
1*
300
NE
50
NE
100
20
NE
250
0.2*
Soo
NE
0.3*
2018 Background Threshold Values (Shallow Flow Zone)'
0.5
0.4
310
50
0.08
5.5
5.7
16.5
1.2
744
75.3
0.5
9.9
1
303
4.2
0.1
140
3.0
5.6
2019 Background Threshold Values (Shallow Flow Zone)
1
1
580
0.2
50
1
5
7
17
5
1095
5
1ss
1
20
1
210
11
0.2
152
5
13
Background Data Set Range (Shallow Flow Zone)
0.1 j - 1.12
0.043 j - 1.7
22.2 - 730
0.012 j - 0.61
3.3 - 56.7
0.052 j - 0.101
0.92 - 5.4
0.076 j - 7.1
0.1 j - 39.2
0.041 j - 5.2
28- 3440
0.19 j - 5.6
1.46 j - 390
0.076 j - 1.4
0.28 j - 21.9
0.092 - 0.72
9 - 223
0.0447 j - 12.8
0.015 j - 0.024
10- 144
0.049 - 6.73
0.077 j - 15.4
2018 Background Threshold Values (Deep Flow Zone)'
0.5
0.6
127
0.1
50
0.08
4.7
3
7.6
1.9
272
---
141
3.2
7.5
1
665
17.7
0.1
183
2.8
3.8
2019 Background Threshold Values (Deep Flow Zone)
1
1
138
0.2
50
0.08
4
6
4
3
225
SO
142
7
8
2
727
24
0.1
200
7
4
Background Data Set Range (Deep Flow Zone)
0. 14j-1.3
0.088j-1.9
15.1-146
0.012 j-0.095j
2.3j-43j
0.03j-0.054j
1.2-4.8
0.01 j-2.7
0.15j-3.1
0.013 j-3.3
30.4j-310
2.5-10.9
7.4-154
0.19 j-10.5
0.13 j-7.9
0.17 j-2.9
81.4-732
2.3-35.4
0.018 j-0.054j
41-202
0.2587-11.14
0.74-4
2018 Background Threshold Values (Bedrock Flow Zone)'
0.5
0.6
435
0.2
50
0.08
4.5
3.9
8.3
2.8
792
---
26.6
3.0
7.2
1
253
18.4
0.1
216
5.7
16.0
2019 Background Threshold Values (Bedrock Flow Zone)
1
1
840
1
50
1
4
8
11
3
1220
11
330
4
8
1
313
22
0.2
195
6
26
Background Data Set Range (Bedrock Flow Zone)
0.11 - 1.25
0.071 j - 2.3
23- 857
0.01 j - 1.8
25.9 j - 49.1 j
0.054 j - 1.9
1.2 - 4
0.012 j - 11.8
0.23 j - 31
0.026 j - 3.9
16- 1530
3.8 - 11
2.8 j - 385
0.13 j - 6.2
0.33 j - 22.8
0.17 j - 2.3
140 - 407
0.42 j - 23.9
0.016 j - 0.069 j
421
2 - 240
4.6E-0 ajI- 1.5E
0.099 j -26.6
Sample ID
Flow Zone
Analytical Results
GWA-075
Shallow
< 0.5
0.17
226
< 0.1
< 50
< 0.08
3.9
1.0
3.6
8.1
823
5.1
271
0.99
6.0
< 0.5
197
11
< 0.1
123
-
0.46
GWA-10S
Shallow
< 0.5
0.27
58
0.12
93
< 0.08
1.6
1.5
2.4
0.17
499
< 2.5
41
< 0.5
4.5
2.0
777
57
< 0.1
153
-
3.0
GWA-11S
Shallow
< 0.5
0.16
53
0.17
2746
0.24
6.0
0.21
0.65
0.26
305
2.1
18
0.88
1.5
21
1064
265
< 0.1
498
0.65
0.36
GWA-13S
Shallow
< 0.5
0.12
89
< 0.1
< 50
< 0.08
3.2
0.88
1.5
0.16
136
1.7
42
< 0.5
3.0
< 0.5
8.2
1.9
< 0.1
38
-
0.35
GWA-14S
Shallow
< 0.5
0.19
37
< 0.1
< 50
< 0.08
1.2
0.37
0.73
0.20
157
1.5
54
1.0
0.56
< 0.5
14
< 1
< 0.1
27
-
< 0.3
GWA-15S
Shallow
< 0.5
0.13
154
0.16
1660
0.29
155
0.16
0.70
1.6
397
5.8
698
< 0.5
2.0
6.3
1687
87
< 0.1
488
2.4
0.36
ILF-01S
Shallow
< 0.5
0.22
87
< 0.1
26
< 0.08
30
0.09
0.74
1.4
250
5.6
408
4.3
4.5
0.68
632
48
< 0.1
209
1.4
1.1
ILF-025
Shallow
0.30
0.08
58
< 0.1
< 50
< 0.08
1.8
0.45
1.9
0.33
74
1.5
51
0.36
2.9
< 0.5
73
1.0
< 0.1
96
0.13
0.91
MS-08
Shallow
< 0.5
0.11
38
0.14
< 50
< 0.08
1.1
3.1
5.2
0.33
801
1.3
9.3
< 0.5
2.0
< 0.5
94
< 1
< 0.1
54
-
4.9
MS-09
Shallow
0.18
0.15
40
2.8
< 50
-
1.2
-
2.2
3.1
185
-
37
-
3.2
-
-
0.32
0.08
69
-
2.7
MS-11
Shallow
< 0.5
0.10
83
< 0.1
< 50
< 0.08
4.4
0.47
2.8
0.28
372
0.74
16
< 0.5
1.5
< 0.5
80
1.1
< 0.1
42
-
0.41
MS-12
Shallow
-
-
74
-
< 50
-
3.2
-
0.90
1.2
117
-
18
-
0.75
-
-
0.5
0.08
32
-
0.62
MS-13
Shallow
< 0.5
0.09
97
0.27
< 50
< 0.08
2.5
0.22
0.67
0.13
< 50
0.94
12
< 0.5
0.66
< 0.5
376
< 1
< 0.1
45
-
0.62
MS-14
Shallow
-
0.22
47
-
< 50
-
1.0
-
0.44
-
60
-
< 5
-
0.99
-
-
0.1
-
65
-
2.4
MS-15
Shallow
0.39
0.15
105
-
< 50
-
2.2
-
17
0.40
129
-
6.5
-
2.5
0.60
-
0.99
-
103
-
6.6
MS-16
Shallow
-
0.16
96
-
< 50
-
1.5
-
3.0
0.40
297
-
8.4
-
1.5
-
-
0.3
-
86
-
4.1
MW-01
Shallow
< 0.5
0.13
387
0.19
200
0.16
159
3.6
4.4
0.18
269
2.2
39
< 0.5
2.3
0.98
2608
15
< 0.1
399
-
1.6
MW-02
Shallow
< 0.5
0.18
49
0.15
3036
0.09
4.8
0.10
< 0.5
< 0.1
< 50
1.4
15
< 0.5
0.4
28
1663
152
< 0.1
295
-
1.0
MW-03
Shallow
< 0.5
< 0.1
270
0.58
< 50
< 0.08
9.2
1.0
1.9
8.7 1
141
1.5
48
< 0.5
2.1
< 0.5
59
< 1
< 0.1
55
-
0.60
MW-05
Shallow
< 0.5
0.25
57
0.35
< 50
< 0.08
2.4
0.27
1.2
0.16
623
0.79
15
0.65
1.2
< 0.5
139
1.0
< 0.1
61
-
0.72
MW-06S
Shallow
< 0.5
0.21
58
0.34
405
0.16
14
0.09
0.73
27
106
< 2.5
1055
< 0.5
1.9
0.56
21
23
0.11
94
1.7
< 0.3
MW-07 (OB-03)
Shallow
< 0.5
0.21
37
0.06
< 50
< 0.08
1.7
0.22
14
0.16
103
-
7.8
0.44
8.0
< 0.5
83
< 1
< 0.1
63
-
0.83
MW-07S
Shallow
< 0.5
3.0
109
1.1
4250
0.15
191
0.03
4.4
42
86
3.1
4382
0.50
3.7
1.6
396
93
0.45
475
1.6
< 0.3
MW-08S
Shallow
< 0.5
0.22
144
< 0.1
238
< 0.08
1.9
0.06
< 0.5
1.2
333
< 2.5
3058
2.2
1.5
1.3
1705
37
< 0.1
539
1.1
0.36
MW-09S
Shallow
< 0.5
< 0.1
254
< 0.1
< 50
< 0.08
14
0.42
0.66
< 0.1
< 50
< 2.5
12
< 0.5
< 0.5
0.51
1105
86
< 0.1
444
0.71
1.8
MW-10S
Shallow
< 0.5
< 0.1
43
< 0.1
< 50
< 0.08
1.0
0.15
< 0.5
0.11
55
0.86
7.7
< 0.5
1.3
< 0.5
< 5
< 1
< 0.1
28
0.85
< 0.3
MW-11S
Shallow
< 0.5
0.14
61
< 0.1
< 50
< 0.08
2.8
5.7
5.8
< 0.1
80
< 0.5
5.2
< 0.5
< 0.5
< 0.5
83
< 1
< 0.1
50
-
2.1
MW-125
Shallow
< 0.5
< 0.1
52
< 0.1
< 50
< 0.08
1.5
0.52
0.66
1.2
122
0.71
17
< 0.5
1.3
< 0.5
33
< 1
< 0.1
31
-
0.41
MW-13S
Shallow
< 0.5
0.12
36
< 0.1
< 50
< 0.08
4.0
0.62
1.1
0.16
534
1.5
8.9
0.59
< 0.5
< 0.5
53
1.3
< 0.1
93
-
4.1
MW-14S
Shallow
< 0.5
< 0.1
35
0.67
2490
0.13
107
0.64
3.7
4.8
871
2.3
51
0.54
50
6.6
2350
217
< 0.1
563
1.1
0.77
OB-01 (Ash Basin)
Shallow
< 0.5
< 0.1
40
0.07
< 50
< 0.08
1.7
0.18
1.9
0.73
198
0.51
25
< 0.5
1.3
< 0.5
19
< 1
< 0.1
27
-
< 0.3
B-01 (Dry Ash Landfill)
Shallow
< 0.5
0.18
1080
0.17
2850
0.22
252
1.1
30
2.5
281
1.4
39
6.2
64
0.55
3275
11
< 0.1
593
-
1.4
PVSF-01S
Shallow
< 0.5
0.20
37
< 0.1
< 50
< 0.08
2.0
0.08
1.8
0.80
266
4.1
141
4.7
3.9
1 < 0.5
220
2.2
< 0.1
87
0.28
1 1.6
PVSF-02S
Shallow
< 0.5
1.1
62
0.81
3507
1.1
8.9
0.05
0.60
21
1737
-
22400
0.20
4.9
3.2
382
495
< 0.1
729
0.86
0.96
PVSF-03S
Shallow
< 0.5
0.44
107
1.4
7487
0.33
6.2
0.76
1.3
133
< 50
4.6
600
0.79
25
17
13
174
< 0.1
418
0.95
0.47
Deep Flow Zone
AB-01D
Deep
< 0.5
0.19
431
< 0.1
1257
< 0.08
222
0.03
0.83
23
703
20
26
< 0.5
1.4
< 0.5
2615
40
< 0.1
606
2.1
1.1
AB-02D
Deep
< 0.5
0.21
28
< 0.1
399
< 0.08
4.9
0.22
0.83
0.43
338
7.7
43
< 0.5
0.65
< 0.5
681
171
< 0.1
380
3.3
0.41
AB-04D
Deep
< 0.5
0.18
72
< 0.1
360
< 0.08
8.4
0.03
< 0.5
0.35
1330
12
55
< 0.5
2.2
< 0.5
239
34
< 0.1
136
-
< 0.3
AB-05D
Deep
< 0.5
0.88
SOS
< 0.1
< 50
< 0.08
2.8
0.03
< 0.5
7.3
755
is
869
< 0.5
10
< 0.5
2662
109
< 0.1
319
0.8
0.63
AB-07D
Deep
< 0.5
0.85
142
< 0.1
< 50
< 0.08
2.2
1.0
1.3
0.17
129
SO
21
< 0.5
3.0
< 0.5
468
< 1
< 0.1
114
-
6.7
AB-14D
Deep
< 0.5
0.17
169
< 0.1
442
< 0.08
1.9
2.1
1.5
< 0.1
52
3.0
5.4
0.62
0.70
0.77
524
55
< 0.1
161
-
1.2
AB-18DU
Deep
< 0.5
2.8
91
< 0.1
< 50
< 0.08
1.9
< 0.025
0.48
4.8
19100
1.4
1820
1.2
0.67
< 0.5
141
1.1
< 0.1
122
1.1
0.62
AB-21D
Deep
< 0.5
0.15
181
< 0.1
< 50
< 0.08
12
< 0.025
1.0
0.72
1058
13
88
1.3
3.7
< 0.5
512
17
< 0.1
177
-
0.61
AL-01D
Deep
< 0.5
0.12
879
< 0.1
3148
< 0.08
265
0.05
1.7
0.26
96
12
22
< 0.5
3.0
< 0.5
5537
16
< 0.1
661
10
0.81
AL-02D
Deep
< 0.5
0.23
44
< 0.1
11633
< 0.08
2.4
0.57
1.7
3.1
252
31
437
2.0
18
94
2770
916
< 0.1
1587
-
1.0
AL-03D
Deep
0.39
0.20
67
< 0.1
5297
< 0.08
2.9
0.09
2.3
0.33
218
17
46
0.98
3.4
52
2875
452
< 0.1
888
-
0.59
AL-04D
Deep
< 0.5
0.26
87
< 0.1
16242
0.09
2.8
0.67
2.8
0.65
440
123
60
1.7
8.8
10
4544
594
< 0.1
1072
-
3.7
CCR-01D
Deep
< 0.5
0.45
51
< 0.1
< 50
< 0.08
1.6
0.06
< 0.5
0.09
< 50
3.1
29
0.41
0.51
< 0.5
670
4.0
< 0.1
131
0.64
13
CCR-02D
Deep
< 0.5
0.10
33
0.10
140
< 0.08
5.0
0.98
0.89
< 0.1
< 50
1.8
32
< 0.5
< 0.5
< 0.5
116
5.0
< 0.1
68
0.75
1.5
CCR-03D
Deep
< 0.5
0.10
39
< 0.1
< 50
< 0.08
1.1
0.09
< 0.5
< 0.1
41
7.7
1.6
0.26
-
0.56
556
94
< 0.1
234
0.76
2.9
CCR-04D
Deep
< 0.5
0.10
51
< 0.1
16
< 0.08
0.8
-
0.66
1.3
-
21
-
0.49
-
< 0.5
-
73
< 0.1
227
0.84
-
CCR-05D
Deep
1.3
0.20
130
< 0.1
8.0
< 0.08
2.9
-
0.54
0.61
-
62
-
0.81
-
< 0.5
-
34
0.13
232
3.0
-
CCR-09DA
Deep
0.42
0.58
83
< 0.1
26
< 0.08
81
0.04
2.9
0.19
144
21
16
1.5
1.7
< 0.5
776
20
< 0.1
284
2.9
0.78
CCR-11D
Deep
< 0.5
< 0.1
900
0.56
2917
1.3
270
-
3.0
4.7
-
6.3
-
< 0.5
-
< 0.5
-
14
0.27
215
6.4
-
Rev. 1 Page 2 of 4
23 April 2020

TABLE 6-5
MEANS OF GROUNDWATER COIs - FEBRUARY 2018 TO MAY 2019
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Molybdenum
Nickel
Selenium
Strontium
Sulfate
Thallium
Total Dissolved
Solids
Total Radium
Vanadium
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
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/L
15A NCAC 02L Standard
1*
10
700
4*
700
2
250
SO
SO
1*
300
NE
50
NE
100
20
NE
250
0.2*
Soo
NE
0.3*
2018 Background Threshold Values (Shallow Flow Zone)'
0.5
0.4
310
50
0.08
5.5
5.7
16.5
1.2
744
75.3
0.5
9.9
1
303
4.2
0.1
140
3.0
5.6
2019 Background Threshold Values (Shallow Flow Zone)
1
1
580
0.2
50
1
5
7
17
5
1095
5
155
1
20
1
210
11
0.2
152
5
13
Background Data Set Range (Shallow Flow Zone)
0.1 j - 1.12
0.043 j - 1.7
22.2 - 730
0.012 j - 0.61
3.3 - 56.7
0.052 j - 0.101
0.92 - 5.4
0.076 j - 7.1
0.1 j - 39.2
0.041 j - 5.2
28 - 3440
0.19 j - 5.6
1.46 j - 390
0.076 j - 1.4
0.28 j - 21.9
0.092 - 0.72
9 - 223
0.0447 j - 12.8
0.015 j - 0.024
10- 144
0.049 - 6.73
0.077 j - 15.4
2018 Background Threshold Values (Deep Flow Zone)'
0.5
0.6
127
0.1
50
0.08
4.7
3
7.6
1.9
272
---
141
3.2
7.5
1
665
17.7
0.1
183
2.8
3.8
2019 Background Threshold Values (Deep Flow Zone)
1
1
138
0.2
50
0.08
4
6
4
3
225
SO
142
7
8
2
727
24
0.1
200
7
4
Background Data Set Range (Deep Flow Zone)
0. 14j-1.3
0.088j-1.9
15.1-146
0.012 j - 0.095 j
2.3j-43j
0.03j-0.054j
1.2-4.8
0.01j-2.7
0.15j-3.1
0.013j-3.3
30.4j-310
2.5-10.9
7.4-154
0.19j-10.5
0.13j-7.9
0.17j-2.9
81.4-732
2.3-35.4
0.018 j - 0.054 j
41-202
0.2587-11.14
0.74-4
2018 Background Threshold Values (Bedrock Flow Zone)'
0.5
0.6
435
0.2
50
0.08
4.5
3.9
8.3
2.8
792
---
26.6
3.0
7.2
1
253
18.4
0.1
216
5.7
16.0
2019 Background Threshold Values (Bedrock Flow Zone)
1
1
840
1
50
1
4
8
11
3
1220
11
330
4
8
1
313
22
0.2
195
6
26
Background Data Set Range (Bedrock Flow Zone)
0.11 - 1.25
0.071 j - 2.3
23- 857
0.01 j - 1.8
25.9 j - 49.1 j
0.054 j - 1.9
1.2 - 4
0.012 j - 11.8
0.23 j - 31
0.026 j - 3.9
16- 1530
3.8- 11
2.8 j - 385
0.13 j - 6.2
0.33 j - 22.8
0.17 j - 2.3
140 - 407
0.42 j - 23.9
0.016 j - 0.069 j
421
2 - 240
4.6E-0 �jI- 1.5E
0.099 j -26.6
Sample ID
Flow Zone
Analytical Results
CCR-12D
Deep
< 0.5
0.07
58
< 0.1
12
< 0.08
3.0
-
0.63
0.05
-
1.9
-
< 0.5
-
< 0.5
-
7.6
< 0.1
116
0.97
-
CCR-13D
Deep
< 0.5
< 0.1
299
< 0.1
202
< 0.08
165
< 0.025
< 0.5
< 0.1
< 50
SO
18
< 0.5
< 0.5
< 0.5
2950
2.6
< 0.1
427
6.5
0.90
CCR-14D
Deep
< 0.5
< 0.1
532
< 0.1
2220
< 0.08
238
-
0.53
< 0.1
-
16
-
< 0.5
-
< 0.5
-
10
< 0.1
565
5.4
-
CCR-15D
Deep
< 0.5
0.55
352
< 0.1
3.2
< 0.08
2.7
-
3.1
0.11
-
7.0
-
0.32
-
0.93
-
5.3
< 0.1
119
2.3
-
CCR-16D
Deep
< 0.5
0.49
41
< 0.1
3.5
< 0.08
3.5
-
0.78
< 0.1
-
14
-
1.3
-
0.41
-
8.2
< 0.1
145
1.8
-
CP-01D
Deep
0.11
0.27
70
1.7
< 50
4.5
10
0.13
< 0.5
91
383
42
24200
2.9
61
1.5
1183
825
< 0.1
1337
1.8
1.3
CP-02D
Deep
0.17
0.20
25
< 0.1
< 50
< 0.08
1.4
0.92
1.8
1.7
318
2.9
370
3.2
2.7
< 0.5
142
< 1
< 0.1
233
0.94
4.0
CP-03D
Deep
< 0.5
0.21
47
< 0.1
< 50
< 0.08
2.1
0.36
1.2
0.21
178
3.7
42
0.85
1.2
< 0.5
99
1.2
< 0.1
341
1.2
3.7
GP-01D
Deep
< 0.5
0.21
185
< 0.1
< 50
< 0.08
1.9
1.4
2.1
0.67
71
5.1
58
0.82
1.4
1.2
779
77
< 0.1
189
1.7
3.0
GP-02D
Deep
< 0.5
0.17
89
< 0.1
< 50
< 0.08
2.1
0.83
1.4
0.33
54
5.3
29
0.95
1.5
0.50
858
30
< 0.1
156
1.3
2.1
GP-03D
Deep
< 0.5
0.31
32
< 0.1
< 50
< 0.08
1.9
0.61
2.3
0.45
275
< 2.5
54
2.6
2.5
< 0.5
235
5.1
< 0.1
94
0.94
1.8
GWA-01D
Deep
< 0.5
0.26
50
< 0.1
< 50
< 0.08
2.3
< 0.025
0.98
0.38
305
18
48
11
4.1
< 0.5
886
214
< 0.1
434
2.2
0.73
GWA-03D
Deep
< 0.5
< 0.1
31
< 0.1
< 50
< 0.08
2.0
0.33
0.60
< 0.1
55
3.9
11
2.4
< 0.5
< 0.5
67
2.3
< 0.1
97
-
1.1
GWA-07D
Deep
< 0.5
0.19
355
< 0.1
< 50
< 0.08
2.6
6.0
5.8
0.19
106
7.5
6.2
0.63
4.5
< 0.5
189
8.9
< 0.1
135
-
4.5
GWA-10D
Deep
< 0.5
0.15
64
0.10
< 50
< 0.08
1.3
< 0.025
0.42
0.28
699
9.1
14
0.88
1.1
< 0.5
1740
220
< 0.1
428
-
0.94
GWA-11D
Deep
< 0.5
0.12
102
< 0.1
1069
< 0.08
5.2
1.9
2.4
0.15
130
8.1
83
< 0.5
0.86
10
1664
112
< 0.1
273
1.5
2.1
GWA-13DA
Deep
1.5
1.1
13
< 0.1
< 50
< 0.08
2.2
0.13
1.1
0.06
345
30
8.2
1.9
0.86
< 0.5
110
2.8
< 0.1
143
-
6.1
GWA-14D
Deep
0.67
0.57
24
< 0.1
< 50
0.10
1.6
0.36
1.6
0.16
204
2.9
24
1.1
1.2
< 0.5
70
1.6
< 0.1
103
-
2.9
GWA-15D
Deep
< 0.5
0.16
94
< 0.1
66
0.09
39
< 0.025
0.64
1.4
1033
8.7
486
2.6
5.2
< 0.5
1025
108
< 0.1
334
11
0.84
ILF-01D
Deep
< 0.5
0.18
52
< 0.1
< 50
< 0.08
4.2
0.61
1.1
0.41
57
4.0
121
1.5
1.3
< 0.5
230
6.2
< 0.1
111
0.76
2.4
ILF-02D
Deep
< 0.5
0.09
22
< 0.1
< 50
< 0.08
2.6
0.33
1.4
1.4
74
4.0
17
0.61
2.2
< 0.5
77
1.3
< 0.1
97
0.70
2.4
MW-06D
Deep
< 0.5
< 0.1
369
< 0.1
175
0.16
143
0.09
1.1
0.22
117
3.1
8.2
< 0.5
3.0
< 0.5
1828
5.6
< 0.1
414
3.3
0.38
MW-07D
Deep
< 0.5
0.18
85
< 0.1
378
< 0.08
115
0.03
0.53
< 0.1
990
8.5
747
< 0.5
< 0.5
< 0.5
1485
74
< 0.1
490
5.9
< 0.3
MW-09D
Deep
< 0.5
< 0.1
87
< 0.1
468
0.13
6.6
0.03
< 0.5
1.4
51
5.1
989
< 0.5
4.6
< 0.5
1175
172
< 0.1
351
< 1.4
0.62
MW-10D
Deep
< 0.5
< 0.1
18
< 0.1
< 50
< 0.08
1.3
0.42
0.59
< 0.1
63
2.1
< 5
< 0.5
< 0.5
< 0.5
99
3.8
< 0.1
72
< 0.49
2.9
MW-11D
Deep
< 0.5
0.20
57
< 0.1
< 50
< 0.08
1.9
8.4
8.8
< 0.1
< 50
3.5
< 5
< 0.5
0.59
< 0.5
94
< 1
< 0.1
66
-
14
MW-12D
Deep
< 0.5
0.13
19
< 0.1
51
< 0.08
< 1
0.45
0.66
0.37
147
3.2
7.0
0.76
0.94
< 0.5
170
4.5
< 0.1
73
-
1.0
MW-13D
Deep
< 0.5
< 0.1
48
< 0.1
< 50
< 0.08
4.4
0.99
1.5
< 0.1
< 50
2.4
< 5
0.65
0.54
< 0.5
69
< 1
< 0.1
89
-
4.9
MW-14D
Deep
< 0.5
0.11
35
0.34
2115
< 0.08
56
0.07
< 0.5
1.8
< 50
4.5
42
< 0.5
20
3.0
2128
160
< 0.1
423
0.53
< 0.3
PVSF-01D
Deep
< 0.5
0.24
74
< 0.1
< 50
< 0.08
1.8
0.18
0.61
0.35
64
2.9
35
1.1
1.6
< 0.5
269
3.4
< 0.1
103
1.2
2.7
PVSF-02D
Deep
< 0.5
0.19
48
0.36
4500
0.88
5.7
0.41
3.1
lO
152
-
933
0.68
7.6
12
689
450
< 0.1
927
2.3
1.1
PVSF-03D
Deep
< 0.5
0.22
1 11
< 0.1
< 50
< 0.08
3.8
0.32
2.1
0.28
239
6.2
65
1.4
1.4
0.71
121
17
< 0.1
135
0.74
2.3
Bedrock Flow Zone
AB-01BR
Bedrock
< 0.5
0.23
79
< 0.1
2818
< 0.08
240
0.03
< 0.5
2.5
8090
21
595
< 0.5
1.0
< 0.5
2217
54
< 0.1
677
17
0.35
AB-01BRL
Bedrock
< 0.5
0.15
289
< 0.1
2213
< 0.08
282
< 0.025
0.67
< 0.1
7961
16
927
0.68
0.66
< 0.5
2054
39
< 0.1
799
16
0.35
AB-01BRLL
Bedrock
< 0.5
0.15
270
< 0.1
2022
< 0.08
288
< 0.025
0.66
0.12
6938
13
1398
0.17
0.84
< 0.5
1783
40
< 0.1
752
4.8
< 0.3
AB-01BRLLL
Bedrock
< 0.5
1.5
80
< 0.1
60
< 0.08
5.8
< 0.025
< 0.5
0.17
122
8.2
304
0.73
0.66
< 0.5
1090
85
< 0.1
340
5.6
0.42
AB-02BR
Bedrock
< 0.5
0.42
5
< 0.1
< 50
< 0.08
2.6
< 0.025
< 0.5
0.16
< 50
3.9
24
0.94
< 0.5
< 0.5
1140
SOS
< 0.1
353
3.9
< 0.3
AB-03D
Bedrock
< 0.5
0.14
115
< 0.1
165
< 0.08
4.5
0.04
1.0
0.13
124
12
48
< 0.5
1.4
< 0.5
1246
95
< 0.1
277
-
2.4
AB-05BR
Bedrock
< 0.5
0.36
83
< 0.1
< 50
< 0.08
1.8
0.16
1.3
0.98
294
48
127
< 0.5
13
< 0.5
3648
281
< 0.1
537
3.0
< 0.3
AB-06BRA
Bedrock
0.12
179
73
< 0.1
512
< 0.08
2.5
0.03
< 0.5
< 0.1
214
59
71
5.7
< 0.5
< 0.5
3273
109
< 0.1
376
-
0.46
AB-06BRL
Bedrock
< 0.5
0.51
30
< 0.1
< 50
< 0.08
2.4
0.03
< 0.5
< 0.1
256
3.0
58
4.4
0.77
< 0.5
6013
281
< 0.1
551
1.5
< 0.3
AB-06D
Bedrock
< 0.5
1.9
92
0.60
5325
< 0.08
3.6
< 0.025
< 0.5
1.9
5473
1s
457
< 0.5
50
< 0.5
4140
43
< 0.1
326
-
< 0.3
AB-08D
Bedrock
< 0.5
0.35
51
< 0.1
< 50
< 0.08
2.4
< 0.025
< 0.5
0.14
89
7.0
329
2.1
< 0.5
< 0.5
2248
76
< 0.1
277
-
< 0.3
AB-09BR
Bedrock
< 0.5
0.63
198
< 0.1
< 50
< 0.08
1.4
0.04
< 0.5
0.14
712
25
92
4.8
1.5
< 0.5
259
16
< 0.1
187
-
0.33
AB-09D
Bedrock
< 0.5
0.41
255
< 0.1
< 50
< 0.08
1.7
< 0.025
0.60
2.4
1006
15
51
2.6
23
< 0.5
228
8.2
< 0.1
147
-
< 0.3
AB-10BR
Bedrock
< 0.5
1 0.37
217
< 0.1
276
< 0.08
2.9
< 0.025
< 0.5
0.13
251
22
27
0.62
1.8
< 0.5
4668
20
< 0.1
377
-
< 0.3
AB-10BRL
Bedrock
< 0.5
6.7
33
< 0.1
< 50
< 0.08
6.2
0.04
< 0.5
< 0.1
64
2.6
39
2.2
< 0.5
< 0.5
3773
89
< 0.1
341
8.2
0.42
AB-10D
Bedrock
< 0.5
0.74
426
< 0.1
1430
< 0.08
5.2
< 0.025
< 0.5
SO
4338
7.7
4197
1.5
25
< 0.5
2857
9.2
< 0.1
332
-
0.66
AB-11D
Bedrock
< 0.5
0.15
17
< 0.1
57
< 0.08
1.7
0.08
< 0.5
< 0.1
118
5.3
5.3
0.68
< 0.5
< 0.5
1198
3.2
< 0.1
106
-
0.60
AB-12BR
Bedrock
< 0.5
0.84
28
< 0.1
51
< 0.08
1.4
0.03
< 0.5
< 0.1
115
5.8
29
2.0
0.62
< 0.5
2756
165
< 0.1
395
8.2
< 0.3
AB-12D
Bedrock
0.57
2.8
49
< 0.1
1118
< 0.08
127
0.18
2.2
< 0.1
108
6.1
104
0.60
2.9
< 0.5
10332
174
< 0.1
689
6.4
< 0.3
AB-13D
Bedrock
< 0.5
0.56
218
< 0.1
< 50
< 0.08
1.8
0.05
1.2
2.1
952
8.1
227
1.4
0.74
< 0.5
691
14
< 0.1
222
-
< 0.3
AB-15BR
Bedrock
< 0.5
0.11
106
< 0.1
< 50
< 0.08
2.2
< 0.02,
< 0.5
< 0.1
1 2412
4.4
1 270
1 0.95
1 0.68
1 0.55
1 1064
1 69
1 < 0.1
286
AB-15D
Bedrock
< 0.5
0.11
253
< 0.1
< 50
< 0.08
1 2.6
1 0.03
1 0.55
< 0.1
1 2612
5.1
1 260
1 0.75
1 0.53
1 < 0.5
1 652
1 34
1 < 0.1
271
Rev. 1 Page 3 of 4
23 April 2020

TABLE 6-5
MEANS OF GROUNDWATER COIs - FEBRUARY 2018 TO MAY 2019
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Molybdenum
Nickel
Selenium
Strontium
Sulfate
Thallium
Total Dissolved
Solids
Total Radium
Vanadium
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
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/L
15A NCAC 02L Standard
1*
10
700
4*
700
2
250
10
10
1*
300
NE
50
NE
100
20
NE
250
0.2*
Soo
NE
0.3*
2018 Background Threshold Values (Shallow Flow Zone)'
0.5
0.4
310
50
0.08
5.5
5.7
16.5
1.2
744
75.3
0.5
9.9
1
303
4.2
0.1
140
3.0
5.6
2019 Background Threshold Values (Shallow Flow Zone)
1
1
580
0.2
50
1
5
7
17
5
1095
5
155
1
20
1
210
11
0.2
152
5
13
Background Data Set Range (Shallow Flow Zone)
0.1 j - 1.12
0.043 j - 1.7
22.2 - 730
0.012 j - 0.61
3.3 - 56.7
0.052 j - 0.101
0.92 - 5.4
0.076 j - 7.1
0.1 j - 39.2
0.041 j - 5.2
28 - 3440
0.19 j - 5.6
1.46 j - 390
0.076 j - 1.4
0.28 j - 21.9
0.092 - 0.72
9 - 223
0.0447 j - 12.8
0.015 j - 0.024
10- 144
0.049 - 6.73
0.077 j - 15.4
2018 Background Threshold Values (Deep Flow Zone)'
0.5
0.6
127
0.1
50
0.08
4.7
3
7.6
1.9
272
---
141
3.2
7.5
1
665
17.7
0.1
183
2.8
3.8
2019 Background Threshold Values (Deep Flow Zone)
1
1
138
0.2
50
0.08
4
6
4
3
225
10
142
7
8
2
727
24
0.1
200
7
4
Background Data Set Range (Deep Flow Zone)
0. 14j-1.3
0.088j-1.9
15.1-146
0.012 j - 0.095 j
2.3j-43j
0.03j-0.054j
1.2-4.8
0.01j-2.7
0.15j-3.1
0.013j-3.3
30.4j-310
2.5-10.9
7.4-154
0.19j-10.5
0.13j-7.9
0.17j-2.9
81.4-732
2.3-35.4
0.018 j - 0.054 j
41-202
0.2587-11.14
0.74-4
2018 Background Threshold Values (Bedrock Flow Zone)'
0.5
0.6
435
0.2
50
0.08
4.5
3.9
8.3
2.8
792
---
26.6
3.0
7.2
1
253
18.4
0.1
216
5.7
16.0
2019 Background Threshold Values (Bedrock Flow Zone)
1
1
840
1
50
1
4
8
11
3
1220
11
330
4
8
1
313
22
0.2
195
6
26
Background Data Set Range (Bedrock Flow Zone)
0.11 - 1.25
0.071 j - 2.3
23- 857
0.01 j - 1.8
25.9 j - 49.1 j
0.054 j - 1.9
1.2 - 4
0.012 j - 11.8
0.23 j - 31
0.026 j - 3.9
16 - 1530
3.8 - 11
2.8 j - 385
0.13 j - 6.2
0.33 j - 22.8
0.17 j - 2.3
140 - 407
0.42 j - 23.9
0.016 j - 0.069 j
421
2 - 240
4.6E-0 ajJ- 1.5E
0.099 j -26.6
Sample ID
Flow Zone
Analytical Results
AB-16D
Bedrock
< 0.5
0.86
183
< 0.1
< 50
< 0.08
3.4
0.03
0.53
0.25
1390
23
201
1.0
1.8
< 0.5
404
25
< 0.1
199
-
< 0.3
AB-17D
Bedrock
< 0.5
0.16
26
< 0.1
< 50
< 0.08
1.2
1.0
1.4
0.11
< 50
5.0
< 5
< 0.5
0.98
< 0.5
107
< 1
< 0.1
89
-
4.5
AB-18D
Bedrock
< 0.5
0.34
37
< 0.1
< 50
< 0.08
1.7
0.17
0.56
0.10
62
4.1
76
1.0
2.0
< 0.5
185
4.8
< 0.1
99
-
2.8
AB-20D
Bedrock
< 0.5
0.57
56
< 0.1
80
< 0.08
1.9
0.04
1.3
< 0.1
262
1.4
10
14
1.5
< 0.5
496
19
< 0.1
132
-
0.76
AL-01BR
Bedrock
< 0.5
< 0.1
368
< 0.1
622
< 0.08
173
0.10
2.9
0.16
81
18
9.7
0.60
7.2
< 0.5
3230
7.8
< 0.1
492
11
0.84
AL-01BRL
Bedrock
< 0.5
1.4
91
< 0.1
< 50
< 0.08
3.8
< 0.025
< 0.5
0.18
165
9.9
365
5.7
0.69
< 0.5
1400
224
< 0.1
474
33
0.80
AL-02BR
Bedrock
0.27
0.40
138
< 0.1
4308
< 0.08
< 1
0.45
1.9
0.75
101
17
41
4.8
6.7
20
3227
254
< 0.1
551
-
2.8
AL-02BRL
Bedrock
< 0.5
0.20
108
< 0.1
1401
< 0.08
1.1
0.28
1.7
0.05
< 50
43
15
1.4
0.63
5.5
1595
203
< 0.1
439
< 0.567
0.29
AL-02BRLL
Bedrock
< 0.5
0.25
76
< 0.1
10084
< 0.08
4.5
0.03
0.80
0.12
321
60
414
1.2
1.2
0.88
3710
520
< 0.1
1013
5.8
< 0.3
AL-02BRLLL
Bedrock
< 0.5
6.1
171
< 0.1
< 50
< 0.08
21
0.03
0.87
0.18
437
3.6
176
1.6
0.86
< 0.5
1023
129
< 0.1
402
4.0
0.83
AL-03BR
Bedrock
< 0.5
0.52
114
< 0.1
1114
< 0.08
2.1
0.07
2.4
0.09
< 50
119
35
4.0
2.2
7.3
1160
178
< 0.1
422
-
< 0.3
AL-04BR
Bedrock
< 0.5
0.14
96
0.11
8992
0.08
1.7
0.47
1.9
0.15
137
33
6.7
0.66
5.1
6.4
2842
225
< 0.1
456
-
3.2
AL-04BRL
Bedrock
< 0.5
0.34
124
< 0.1
< 50
< 0.08
2.3
< 0.025
0.82
< 0.1
582
27
56
1.7
0.54
< 0.5
413
5.6
< 0.1
134
-
0.38
GWA-01BR
Bedrock
< 0.5
0.11
38
< 0.1
< 50
< 0.08
3.0
2.4
2.8
0.82
72
6.2
< 5
< 0.5
0.57
< 0.5
276
50
< 0.1
159
1.2
4.1
GWA-09BR
Bedrock
< 0.5
< 0.1
17
< 0.1
< 50
< 0.08
4.3
0.64
0.84
< 0.1
< 50
3.8
< 5
< 0.5
0.55
< 0.5
52
< 1
< 0.1
98
-
3.1
GWA-11BR
Bedrock
0.73
0.13
52
< 0.1
< 50
< 0.08
3.7
< 0.025
1.9
< 0.1
223
5.4
8.0
1.1
2.3
< 0.5
566
48
< 0.1
201
1.3
2.3
GWA-12D
Bedrock
< 0.5
0.35
42
< 0.1
< 50
< 0.08
3.4
< 0.025
< 0.5
0.10
72
-
9.2
12
0.76
< 0.5
285
11
< 0.1
150
< 0.601
0.32
ILF-01BR
Bedrock
0.48
0.34
8
< 0.1
< 50
< 0.08
2.7
0.21
1.8
16
199
4.7
39
5.9
3.1
< 0.5
160
4.7
< 0.1
126
0.53
2.4
MW-08D
Bedrock
< 0.5
0.11
14
0.11
277
< 0.08
8.5
< 0.025
< 0.5
0.31
832
6.6
111
< 0.5
< 0.5
< 0.5
1693
97
< 0.1
383
2.3
< 0.3
MW-14BR
Bedrock
< 0.5
0.13
43
< 0.1
144
< 0.08
53
0.41
3.0
0.17
90
12
5.7
0.69
4.2
1.2
819
9.8
< 0.1
158
3.0
3.2
MW-14BRL
Bedrock
< 0.5
0.47
227
< 0.1
< 50
< 0.08
2.2
< 0.025
0.62
< 0.1
90
5.1
6.8
1.4
0.58
< 0.5
280
10
< 0.1
209
5.6
6.3
PVSF-01BR
Bedrock
0.53
1 0.47
96
< 0.1
< 50
< 0.08
6.2
0.06
1.6
0.16
518
6.0
82
5.5
1.3
< 0.5
306
12
< 0.1
158
1.9
0.81
PVSF-02BR
Bedrock
< 0.5
0.16
54
< 0.1
2900
< 0.08
5.6
0.10
< 0.5
4.3
182
5.8
462
3.9
1.9
6.8
1028
341
< 0.1
704
0.51
1.1
PVSF-03BR
Bedrock
0.25
0.74
40
< 0.1
< 50
< 0.08
4.9
0.04
2.8
0.46
105
< 2.5
26
14
4.6
< 0.5
619
14
< 0.1
196
0.64
0.86
Notes:
' - Background threshold values were calculated using data from background groundwater samples collected September 2015 to October 2017
2 - Background threshold values were calculated using data from background groundwater samples collected February 2010 to December 2018
Statistical mean calculated from data ranging from January 2018 to June 2019. Ash pore water results are not compared to groundwater standards or criteria.
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 COls 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 - greatest comparative value
- 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.
- - no available data to conduct mean analysis
NE - not established
mg/L - milligrams per liter
pg/L - micrograms per liter
Prepared by: WCG Checked by: ECW
Revised Feb. 28, 2020
Rev. 1
23 April 2020
Page 4 of 4

TABLE 6-6
COI MANAGEMENT MATRIX
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Groundwater
ckground Value
Constituent Standards and Values - 02L Criterion
Lines of Evidence (LOE) - 02L Criterion Rationale for Exclusion/Inclusion for Corrective Action
Shallow
0.4
1
0.043 - 5
3.0
0.3
0
-
0
0
0
N
No means exceed comparative criteria
Transition Zone
0.6
1
0.088 - 1.9
0.6
0.1
0
-
0
0
0
N
No means exceed comparative criteria
Arsenic
pg/L
10
0.1 - 6.35
y
Variable
Bedrock
0.6
1
0.071 - 2.3
0.2
0.0
0
-
0
0
0
N
No means exceed comparative criteria
Shallow
310
580
22.2 - 730
254
0.4
0
-
0
0
0
N
No means exceed comparative criteria
Transition Zone
127
138
15.1 - 146
879
1.3
1
AL-11)
4
1
1
y
Single location with detection of barium above 02L standard. Does not exhibit a discernible plume; however, other
CCR-related constituents present above comparative criteria
Barium
pg/L
700
11 - 840
y
Variable
Bedrock
435
840
23 - 857
368
0.4
0
-
0
0
0
N
No means exceed comparative criteria
AB -IS, AL-1S, CCR-9S,
Shallow
50
50
3.3 - 56.7
4,250
6.1
7
GWA-11S, GWA-15S, MW-
12
12
11
y
Exceedances depict a plume -like distribution likely attributed to the ash basin
7S. MW-14S
Transition Zone
50
50
2.3 - 50
3,148.33
4.5
4
AB-11), AL-11), GWA-11D,
MW-14D
9
9
7
y
Exceedances depict a plume -like distribution likely attributed to the ash basin
Boron
pg/L
700
49.1 - 176.8
y
Conservative
Bedrock
50
50
25.9 - 50
2,818.33
4.0
3
AB-1BR, AB-1BRL, AB-
1BRLL
6
6
5
y
Single location (three intervals) with detection of boron about 02L. Does not exhibit a discernible plume; however,
other CCR-related constituents present above comparative criteria
Shallow
0.08
1
0.052 - 1
0.7
0.4
0
-
0
0
0
N
No means exceed comparative criteria
Cadmium
pg/L
2
0.08 - 1
y
Variable
Transition Zone
0.08
0.08
0.03 - 0.08
0.2
0.1
0
-
3
0
0
N
No means exceed comparative criteria
Bedrock
0.08
1
0.054 - 1.9
< 0.08
0
0
-
0
0
0
N
No means exceed comparative criteria
Shallow
5.5
5
0.92 - 5.4
191
0.8
0
-
11
11
0
N
No means exceed comparative criteria
Transition Zone
4.7
4
1.2 - 4.8
265
1.1
1
AL -SD
10
a
1
y
Single location with detection of chloride above 02L. Does not exhibit a discernible plume; however, other CCR-
related constituents present above comparative criteria
Chloride
mg/L
250
3 - 250
y
Conservative
Bedrock
4.5
4
1.2-4
288
1.2
2
AB-1BRL, AB-1BRLL
6
6
2
y
Single location (two intervals) with detection of chloride about 02L. Does not exhibit a discernible plume; however,
other CCR-related constituents present above comparative criteria
Chromium
(Hexavalent)
pg/L
10
Shallow
5.7
7
0.076 - 7.1
0.03 - 12
1.5
0.2
0
-
y
0
0
0
N
Variable
No means exceed comparative criteria
Transition Zone
3
6
0.01 - 3.3
6.0
0.9
0
-
1
0
0
N
No means exceed comparative criteria
Bedrock
3.9
8
0.012 - 11.8
2.4
0.3
0
-
0
0
0
N
No means exceed comparative criteria
Shallow
16.5
17
0.23 - 39.2
4
0.3
0
-
0
0
0
N
No means exceed comparative criteria
Transition Zone
7.6
4
0.15 - 3.1
6
0.6
0
-
1
0
0
N
No means exceed comparative criteria
Chromium (Total)
pg/L
10
1 - 26
y
Non -Conservative
Bedrock
8.3
11
0.23 - 31
3
0.3
0
-
0
0
0
N
No means exceed comparative criteria
Shallow
744
1,095
26.9 - 3440
1,298
1.2
1
AB-2S
0
0
0
y
Single location with detection of iron above 02L. Does not exhibit a discernible plume; however, other CCR-related
constituents present above comparative criteria
Transition Zone
272
225
30.4 - 310
1,032.50
3.4
5
AB -ID, AB-2D, GWA_10D,
GWA-15D. MW-71D
s
o
o
v
Exceedances depict aplume-like distribution likely attributed to the ash basin
Iron
pg/L
300
56.3 - 37500
y
Variable
Bedrock
792
1,220
10- 1530
3
3
0
y
Single location (three intervals) with detection of iron about 02L. Does not exhibit a discernible plume; however,
other CCR-related constituents present above comparative criteria
8,090
6.6
3
AB-1BR, AB-1BRL, AB-
1BRLL
AB-1S, AB-2S, AL -IS, CCR-
Shallow
75.3
155
2.2 - 390
4,381.67
28.3
9
9S, GWA-7S, GWA-15S,
s
8
0
y
Exceedances depict a plume -like distribution likely attributed to the ash basin
MW-6S, MW-7S, MW-8S
Manganese
pg/L
50
7 -9170
y
Variable
Transition Zone
141
142
2.8 - 154
989
7.0
3
GWA-15D, MW-7D, MW-9D
3
3
0
y
Exceedances depict a plume -like distribution likely attributed to the ash basin
Bedrock
26.6
330
2.7 - 385
1,397.50
4.2
3
AB-1BR, AB-1BRL, AB-
1BRLL
3
3
0
y
Exceedances depict a plume -like distribution likely attributed to the ash basin
Shallow
9.9
20
0.28 - 21.9
50
0.5
0
-
1
1
1
N
No means exceed comparative criteria
Transition Zone
7.5
8
0.13 - 7.9
20
0.2
0
-
1
0
0
N
No means exceed comparative criteria
Nickel
pg/L
100
1.98 - 20
y
Variable
Bedrock
7.2
8
0.33 - 22.8
7
0.1
0
-
0
0
0
N
No means exceed comparative criteria
Selenium
p9/L
20
Shallow
0.5
1
0.092 - 10
0.5 - 2
21
1.1
1
GWA-11S
y
1
1
1
y
Variable
Single location with detection of selenium above 02L. Does not exhibit a discernible plume; however, other CCR-
related constituents present above comparative criteria
Transition Zone
0.5
2
0.17 - 2.9
10
0.5
0
-
2
0
2
IN
No means exceed comparative criteria
Bedrock
0.5
1
0.17 - 2.3
1
0.1
0
-
0
0
0
N
No means exceed comparative criteria
Sulfate
mg/L
250
Shallow
4.2
11
0.0589 - 12.8
1.2 - 510
265
1.1
1
GWA-11S
y
13
12
0
y
Conservative
Single location with detection of sulfate above 02L. Does not exhibit a discernible plume; however, other CCR-related
constituents present above comparative criteria
Transition Zone
17.7
24
2.3 - 35.4
220
0.9
0
-
10
10
0
N
No means exceed comparative criteria
Bedrock
18.4
22
0.42 - 23.9
97
0.4
0
-
6
6
10
N
No means exceed comparative criteria
Shallow
140
152
10- 144
563
1.1
4
AB-1S, AL-1145 W 85 MW
12
11
0
y
Exceedances depict a plume -like distribution likely attributed to the ash basin
Transition Zone
183
200
41 - 202
661
1.3
2
AB -ID, AL -ID
15
12
0
y
Exceedances depict a plume -like distribution likely attributed to the ash basin
Total Dissolved Solids
mg/L
500
50- 1200
y
Conservative
Bedrock
216
195
42 - 240
799
1.6
3
AB-IBR, AB-IBRL, AB-
1BRLL
5
5
0
y
Exceedances depict a plume -like distribution likely attributed to the ash basin
Constituent Standards and Values - IMAC Criterion
Lines of Evidence (LOE) - IMAC Criterion
Rationale for Exclusion - IMAC Criterion
Shallow
0.5
1
0.1 - 1.12
0.5
0.5
0
-
0
0
0
N
No means exceed comparative criteria
Transition Zane
0.5
1
0.11 - 1.3
1.325
1.3
1
CCR-5D
1
0
0
y
Single location with detection of antimony above IMAC. Does not exhibit a discernible plume; however, other CCR-
related constituents present above comparative criteria
Antimony
pg/L
1
0.5 - 4.2
y
Conservative
Bedrock
0.5
1
0.11 - 2.5
0.726
0.7
0
-
0
0
0
N
No means exceed comparative criteria
Beryllium
p9/L
4
Shallow
0.2
0.2
0.012 - 0.61
0.053 - 1
4.6
1.2
1
AL -IS
y
7
2
2
y
Non -Conservative
Single location with detection of beryllium above IMAC. Does not exhibit a discernible plume; however, other CCR-
related constituents present above comparative criteria
Transition Zone
0.1
0.2
0.012 - 0.2
0.34
0.1
0
-
1
0
0
N
No means exceed comparative criteria
Bedrock
0.2
1
0.01 - 1.8
1 0.1
1 0.0
1 0
0
0
1 0
N
No means exceed comparative criteria
1
Rev. 1 Page 1 of 2
23 April 2020

TABLE 6-6
COI MANAGEMENT MATRIX
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Constituents of
Interest'
Reporting
Unit
Groundwater
Zone Statistically
Derived Background
Value
Marshall Steam
Station
Back r und Data
Set Range
Piedmont
Background
Value
Range
NCznrroerntratio n
Beyond
Boundary7
Groundwater
E.ceed.nce
Wells Above
Criterion
Near or Beyond
Compliance
Groundw ter Monitoring
Well: With COX
Concentration Greater Than
Comparative Criteria
AB-1S, AB-2S, AL-1S, CCR-
4� q�, b , 0 t C
qj, 101�1 Rationale for Selection of Ols for Corrective Action
V,� qVP 4P er b (a constituen is not warranted for corrective action if no means are greater than
-0 4PVZ
�F 4* comparative criteria in all flow zones and/or lines of evidence support that the
"o
constituents's occurrances are not related to the source area)
Shallow
1.2 5
0.041 - 5.2
116.4
23.3
8
4S, CCR-9S, GWA-7S, MW-
8 8 2 y Exceedances depict a plume -like distribution likely attributed to the ash basin
Cobalt
Ng/L
1
0.2 - 88.85
6S. MW-7S
v Variable Single location with detection of cobalt above IMAC. Does not exhibit a discernible plume; however, other CCR-related
1 1 0 v
constituents present above comparative criteria
Transition Zone
1.9 3
0.013 - 3.3
23.1
7.2
1
AB-11)
Bedrock
2.8 3
0.026 - 3.9
2.5
0.9
0
-
0 0 0 N No means exceed comparative criteria
Shallow
0.1 0.2
0.015 - 0.2
0.7
3.5
4
AB -IS, CCR-4S, CCR-9S,
MW-75
4 4 4 y
Four locations with detection of thallium above 02L. Two locations depict a plume -like distribution attributed to the
ash basin
Thallium
pg/L
0.2
0.1 -0.2
v
Variable
1 0 0 N
Transition Zone
0.1 0.1
0.018 - 0.1
0.1
0.7
0
-
NO means exceed comparative Criteria
Bedrock
0.1 0.2
0.015 - 0.2
< 0.1
0
0
0 0 0 N
No means exceed comparative criteria
Shallow
5.6 13
0.093 - 15.4
3.0
0.2
0
-
0 0
0 N
No means exceed comparative criteria
Single location with detection of vanadium above IMAC. Does not exhibit a discernible plume. Concentrations are
Vanadium
Ng/L
0.3
Transition Zone
3.8 4
0.74 - 4
0.657 - 26
4.5
1.1
1
GWA-71)
y
1 0
0 N Non -Conservative
within range of Piedmont background datasets. Groundwater flow direction derived from water elevations collected
over 30 monitoring events and velocity vectors derived from groundwater flow and transport modeling simultations
indicate this location is beyond the downgradient flow path from the source area.
Bedrock
1 16 1 26
1
4.1
0.2
0
-
0 1 0
No means exceed comparative criteria
1 0 N
Constituent Standards and Values - Background Criterion
Lines of Evidence (LOE) - Background Criterion
Rationale for Exclusion - Background Criterion
Shallow
NE
5
0.19 - 5.6
7.1
1.4
3
AL -IS, CCR-9S, GWA-15S
3
0
0
y
Three locations with detection of lithium above background. Does not exhibit a discernible plume; however, other CCR
related constituents present above comparative criteria
AB-11), AL-11), CCR-4D,
Lithium
Ng/L
NE
Transition Zone
NE
10
2.5 - 10.9
2 - 95.39
61.7
6.2
6
CCR-SD, CCR-9DA, GWA-
y
6
6
o
y
Conservative
Exceedances depict a plume -like distribution likely attributed to the ash basin
1D
Bedrock
NE
11
3.8 - 11
20.8
1.9
5
AB-1BR, AB-1BRL, AB-
1BRLL AL-1BR MW-14BRplume-like
5
5
0
y
Three locations (one location with three intervals) with detection of lithium above background. Two locations depict a
distribution attributed to the ash basin
Shallow
0.5
1
0.084 - 1.4
2.16
2.2
1
MW-8S
1
0
0
y
Single location with detection of molybdenum above background. Does not exhibit a discernible plume; however,
other CCR-related constituents present above comparative criteria
Single location with detection of molybdenum above background. Does not exhibit a discernible plume.
Molybdenum
Ng/L
NE
Transition Zone
3.2
7
0.19 - 10.5
0.5 - 26
11.17
1.6
1
GWA-1D
Y
1
1
o
N
Variable
Concentrations are within range of Piedmont background datasets. Groundwater flow direction derived from water
elevations collected over 30 monitoring events and velocity vectors derived from groundwater flow and transport
modeling simultations indicate this location is beyond the downgradient flaw path from the source area.
Bedrock
3
4
1 0.13 - 6.2
1.1
0.3
0
-
o
0
0
y
No means exceed comparative criteria
AB-1S, AL -IS, CCR-3S,
Shallow
303
210
9 - 223
2,350
11.2
10
GWA-SOS, GWA-11S, GWA-
15S, MW-7S, MW-8S, MW-
10
7
1
y
Exceedances depict a plume -like distribution likely attributed to the ash basin
9S, MW-14S
Transition Zone
665
727
81.4 - 732
5,537
7.6
11
AB-11), AL-11), CCR-9DA,
GWA-1D, GWA-10D, GWA-
11
11
2
y
Exceedances depict a plume -like distribution likely attributed to the ash basin
Strontium
Ng/L
NE
27 - 2,272
y
Non -Conservative
11rn) .WA-1Sn. Mw-Arn)
AB- 1BR, AB- 1BRL, AB -
Bedrock
253
313
140 - 407
3,230
10.3
7
1BRLL, AL-1BR, GWA-11BR,
7
6
1
y
Exceedances depict a plume -like distribution likely attributed to the ash basin
MW-8BR, MW-14BR
Shallow
3
5
(-0.112) - 6.73
3.1
0.6
0
-
0
0
0
N
No means exceed comparative criteria
Total Radium
pCi/L
NE
0.825 - 35
N
Variable
Transition Zone
2.8
7
0.2587 - 11.14
10.8
1.5
2
AL -SD, GWA-15D
0
0
0
y
Two locations with detection of total radium above IMAC. Does not exhibit a discernible plume; however, other CCR-
related constituents present above comparative criteria
Bedrock
5.7
6
0.573 - 7.43
16.7
2.8
3
AB-1BR, AB-1BRL, AL-1BR
3
2
0
y
Single location (three intervals) with detection of chloride about IMAC. Does not exhibit a discernible plume; however,
other CCR-related constituents present above comparative criteria
Prepared by: ECW Checked by: VJH
Notes Revised Feb. 28, 2020
- Reference Criterion
- Evidence warrants COI Inclusion for corrective action
0 - Evidence does not warrant COI inclusion for corrective action
' - Constituent list reflects the COIs Identi0ed In the 2018 CSA Update report (SynTern, January 2018), In addition to CCR Rule Appendix IV constituents with statistically significant Increases above the groundwater protection standards, and constituents requested for Inclusion by NCDEQ.
2- Background values include groundwater data collected September 2015 through October 2017.
'- Updated background values Include groundwater data collected February 2010 through December 2018.
- Exceedance ratio = calculated COI mean concentration divided by criterion concentration.
' - Assignment of conservative, non -conservative, or variable behavior Is based on geochemlcal modeling results.
- The following wells were used W calculate mean concentrations for ash pore water: A13-3S, AB-4S/SL, AB -SS, A13-6S, A13-7S, A13-8S, AB-10S/SL, AB-12S/SL, A13-13S, A13-14S, AB-15S/SL, A13-17S, A13-18S, A13-205, A13-21S, AL-3S
' - The following wells were used to calculate mean concentrations near or beyond compliance boundary: AS-IS/D/SR/SRL/SRLL, AS-2S/0, AL-IS/D/BR, CCR-3S/D, CCR-4S/D, CCR-SS/D, CCR-9S/DA, GWA-tS/D/BR, GWA-7S/D, GWA-105/0, GWA-IIS/D/BR, GWA-ISS/D, MW-6S/D, MW-7S/D, MW-BS/D, MW-9S/D, MW-IOS/D, MW-14S/D/BR
> - greater than
< - less than
COI - constituent of Interest
CSA - Comprehensive Site Assessment
IMAC - Interim maximum allowable concentration
MCL- maximum contaminant level
yg/L- micrograms per liter
mg/L- milligrams per liter
pCi/L - picocurles per liter
NA - Not Applicable
NE - Not Established
Y - Yes
N - No
Rev. 1 Page 2 of 2
23 April 2020

TABLE 6-9
WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Molybdenum
Nickel
Selenium
Strontium
Sulfate
Thallium
Total
Dissolved
Solids
Total
Radium
Vanadium
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
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/L
15A NCAC 02L Standard
Sx
SO
700
4*
700
2
250
SO
10
1*
300
NE
50
NE
100
20
NE
250
0.2*
500
NE
0.3*
Impacted by
Coal Ash?
Comments
Background Threshold Values (Bedrock Flow Zone)'
0.5
0.6
435
0.2
50
0.08
4.5
3.9
8.3
2.8
792
---
26.6
3.0
7.2
1
253
18.4
0.1
216
5.7
16.0
Background Threshold Values (Bedrock Flow Zone)'
1
1
840
1
50
1
4
8
11
3
1220
11
330
4
8
1
313
22
0.2
195
6
26
Background Data Set Range (Bedrock Flow Zone)
0.11 - 1.25
0.071 j - 2.3
23 - 857
0.01 j - 1.8
25.9 j - 49.1 j
0.054 j - 1.9
1.2-4
0.012 j - 11.8
0.23 j - 31
0.026 j - 3.9
16 - 1530
3.8 - 11
1 2.8 j - 385
0.13 j - 6.2
0.33 j - 22.8
0.17 j - 2.3
140 - 407
0.42 j - 23.9
%16 j -
0.069'
42 240
4.6E-05 j -
1.5E-04'
0.099 j -26.6
Sample ID
Sample Collection Date
Analytical Results
MR1
03/03/2015
0.29 j
<1
13
<1
<500
0.84 j
7.2
<10
<10
<1
28 j
NA
0.68 j
0.11 j
<2
<1
28
11
<1
58
NA
<5
N
All COIs are below comparative criteria
MR10
04/30/2015
<0.5
<0.5
38.8
<0.2
<5
<0.08
2.4
0.43
0.99
<0.5
260
NA
1.7
<0.5
<0.5
<0.5
59
<2
<0.1
65
NA
1.5
N
All COIs are below comparative criteria
MR-1000
10/12/2016
<0.5
0.17
36
<0.1
<25
0.54
2.2
0.7
1.4
<0.1
<50
NA
0.76
<0.5
1.6
<0.5
95.4
<2
NA
91
NA
1.9
N
All COIs are below comparative criteria
MR-1001
10/11/2016
<0.5
<0.1
47.7
<0.1
<25
<0.08
4.8
1.2
1.8
<0.1
<50
NA
1.3
<0.5
0.86
<0.5
140
<2
NA
67
NA
1.1
N
All COIs are below comparative criteria
MR-1002
09/23/2016
<0.5
<0.1
23.1
<0.1
<25
<0.08
1
6.2
7.2
<0.1
<50
NA
0.62
<0.5
<0.5
<0.5
68.5
<2
NA
66
NA
5
N
All COIs are below comparative criteria
MR-1003
10/18/2016
<0.5
0.23
34.3
0.12
<25
<0.08
7.6
2.4
2.6
<0.1
<50
NA
10.5
<0.5
0.59
<0.5
111
3.8
NA
81
NA
1
N
All COIs are below comparative criteria
MR-1004
09/23/2016
<0.5
<0.1
44.9
<0.1
<25
0.24
1 1.1
2
2.3
<0.1
<50
NA
1.1
<0.5
<0.5
<0.5
160
<2
NA
35
NA
3.7
N
All COIs are below comparative criteria
MR-1005
01/05/2017
<0.5
<0.1
45.2
<0.1
<25
<0.08
2.1
2.5
1.6
<0.1
<50
1 NA
1 0.85
<0.5
<0.5
1 <0.5
103
<2
NA
67
NA
4.4
N
All COIs are below comparative criteria
MR-1006
01/05/2017
<0.5
<0.1
48.6
<0.1
<25
<0.08
3.8
0.77
1.1
<0.1
<50
NA
1.2
<0.5
1
<0.5
563
<2
NA
107
NA
2.3
N
Located west and sidegradient of ash basin. Strontium exceedance
possible from natural source.
MR-1007
02/21/2017
<0.5
<0.1
412
0.2
<25
<0.08
6.4
1.1
1.5
0.34
<50
NA
6.2
<0.5
3.2
<0.5
156
<2
NA
115
NA
0.42
N
All COIs are below comparative criteria
MR-1008
02/21/2017
<0.5
<0.1
30.8
<0.1
<25
<0.08
1.4
1.7
2.2
<0.1
<50
NA
0.59
<0.5
<0.5
<0.5
98.9
<2
NA
55
NA
3.1
N
All COIs are below comparative criteria
MR-1009
02/21/2017
<0.5
<0.1
20.5
<0.1
<25
<0.08
2
0.63
0.93
<0.1
268
NA
3.6
<0.5
<0.5
<0.5
75.5
<2
NA
84
NA
3.4
N
All COIs are below comparative criteria
MR-1010
04/26/2017
<0.5
<0.1
30.1
<0.1
<25
<0.08
4
5.8
3.1
<0.1
<50
NA
0.91
<0.5
<0.5
<0.5
172
1.2
NA
91
NA
5.8
N
All COIs are below comparative criteria
MR11
04/30/2015
<0.5
<0.5
48.5
<0.2
<5
<0.08
1.3
0.52
0.87
<0.5
<50
NA
0.72
<0.5
<0.5
<0.5
78.2
2
<0.1
71
NA
1
N
All COIs are below comparative criteria
MR12
02/05/2015
<1
2.9 j
34
<2
<130
<0.1
2.3
<20
<25
<25
330
NA
0.088 j
10 j
<5
99
<1
<0.5
93 B
NA
12 j
N
All COIs are below comparative criteria
MR13
03/03/2015
<3
<10
11.4
<1
<100
<1
1.9
<20
<10
<5
<50
NA
<10
<10
<10
<10
106
<10
<1
56
NA
1.97
All COIs are below comparative criteria
MR13
07/31/2015
<0.5
<0.5
32.1
<0.2
<5
<0.08
1.1
0.18
0.56
<0.5
<50
NA
0.79
4.7
<0.5
<0.5
353
8.4
<0.1
85
NA
2.8
N
Located west and sidegradient of ash basin. Molybdenum and
Strontium exceedances Dossible from natural source.
MR14
02/05/2015
<1
<1
49
<0.4
<25
<0.1
2.3
<20
<5
<5
210
NA
<5
<10
<5
<1
77
<1
<0.5
67
NA
<5
N
MR14
05/22/2015
<0.5
<0.5
49.5
<0.2
<5
<0.08
2.3
0.65
0.82
<0.5
<50
NA
1.5
<0.5
<0.5
<0.5
85.3
<2
<0.1
38
NA
1.1
ll b
ACOIs are elow comparative criteria
MR16
02/18/2015
<0.5
<2
86.8
<0.5
<50
<0.15
7
<5
<2
<1
969
NA
131
<2
<0.5
<2
103
16
<0.5
125
NA
0.36
N
MR16
08/13/2015
<0.5
<0.5
86.5
<0.2
<5
<0.08
10.2
<0.03
<0.5
<0.5
718
NA
112
<0.5
<0.5
<0.5
101
18.7
<0.1
140
NA
<1
All COIs are below comparative criteria
MR17
02/05/2015
<1
<1
12
<0.4
<25
<0.1
1.4
<20
<5
<5
240
NA
<5
<10
<5
<1
160
<1
<0.5
45
NA
<5
N
MR17
05/20/2015
<0.5
<0.5
10.6
<0.2
<5
<0.08
1.3
0.25
<0.5
<0.5
<50
NA
<0.5
<0.5
<0.5
<0.5
189
<2
<0.1
46 D6
NA
2.6
All CO[s are below comparative criteria
MR18
02/05/2015
<5
<5
<25
<2
<130
<0.5
3.3
<20
<25
<25
500
NA
<25
<50
<25
<5
240
1.6
<2.5
88
NA
<25
N
MR18
05/20/2015
<0.5
<0.5
1 17
<0.2
<5
<0.08
3.5
0.037
<0.5
<0.5
<50
NA
2
<0.5
<0.5
<0.5
201
2.8
<0.1
82
NA
1.8
All COIs are below comparative criteria
MR2 Office
03/03/2015
<1
<1
31
<1
<500
<1
1.2
<10
4.5
<1
82
NA
<5
<2
<2
<1
100
<1
<1
68
NA
5.5
All COIs are below comparative criteria
MR2 Office
08/03/2015
<0.5
<0.5
90.2
<0.2
<5
0.086
1.1
<0.03
<0.5
<0.5
109
NA
17.2
2.1
3.2
<0.5
378
3.4
<0.1
92
NA
2.8
N
Located south and sidegradient of ash basin. Outside half -mile radius
from basin. Strontium exceedance possible from natural source.
MR2 Plant
03/03/2015
<1
<1
130
<1
<500
<1
<1
<10
2.1
<3
3700
NA
50
<2
<2
<1
260
4
<1
130
NA
<5
N
Located south and sidegradient of ash basin. Outside half -mile radius
from basin. Iron exceedance possible from natural source.
MR20
02/05/2015
<1
<5
14
<2
<130
<0.1
3.3
<20
<25
<25
1100
NA
<25
<10
<25
<5
170
1.3
<0.5
100
NA
<25
N
MR20
07/31/2015
<0.5
<0.5
14
<0.2
<5
<0.08
3.1
0.43
0.96
<0.5
<50
NA
<0.5
2.2
<0.5
<0.5
132
2.2
<0.1
107
NA
2.8
All COIs are below comparative criteria
MR21
02/05/2015
<1
<5
82
<2
<130
<0.5
4
<20
<25
<25
190
NA
34
<50
<25
<5
<50
<1
<0.5
49
NA
<25
N
All COIs are below comparative criteria
MR21
05/21/2015
<0.5
<0.5
74.6
<0.2
<5
<0.08
4.1
0.15
<0.5
0.75
<50
NA
17.9
<0.5
0.66
<0.5
9.7
<2
<0.1
26
NA
<1
All COIs are below comparative criteria
MR22
04/30/2015
<0.5
<0.5
79.3
<0.2
<5
<0.08
2.3
0.56
0.91
<0.5
<50
NA
3.8
<0.5
0.55
<0.5
34.1
<2
<0.1
55
NA
<1
N
All COIs are below comparative criteria
MR23
02/12/2015
<1
<5
110
<1
<100
<0.1
<5
<10
1
<1
<50
NA
<5
<5
<5
<5
270
<1
<0.1
<25
NA
3
N
MR23
08/13/2015
<0.5
<0.5
121
<0.2
<5
<0.08
27.6
1.1
1.5
<0.5
<50
NA
1.2
<0.5
<0.5
<0.5
278
2.7
<0.1
194
NA
2.6
All COIs are below comparative criteria
MR23 (State Well)
02/12/2015
<10
<2
130
<5
<50
<0.5
25
<50
<10
<50
<50
NA
<10
<10
<2
<5
280
<2
<2
155
NA
<25
N
All COIs are below comparative criteria
MR25
03/03/2015
<1
<1
47
<1
<500
<1
7.8
<10
<1
<1
<50
NA
<5
<2
<2
<1
110
<1
<1
150
NA
<5
N
MR25
08/13/2015
<0.5
<0.5
53.8
<0.2
<5
<0.08
6.5
0.96
1.1
<0.5
<50
NA
1.2
<0.5
<0.5
<0.5
110
3.1
<0.1
108
NA
2
All CO[s are below comparative criteria
MR26
02/12/2015
<1
<5
56
<1
<100
<0.1
2.68
<10
1
<1
<50
NA
<5
<5
<5
I <5
170
1.12
<0.1
1 80
NA
3
N
MR26
08/14/2015
<0.5
<0.5
52
<0.2
<5
<0.08
3
1.2 M1
1.4
<0.5
<50
NA
<0.5
<0.5
<0.5
<0.5
149
2
<0.1
66
NA
2.9
All COIs are below comparative criteria
MR26 (State Well)
02/12/2015
<10
<2
57
<5
<50
<0.5
3.4
<50
<10
<50
<50
NA
<10
<10
<2
<5
160
<2
<2
76
NA
<25
N
All COIs are below comparative criteria
MR28
04/30/2015
<0.5
<0.5
44.5
<0.2
<5
<0.08
14 M1
0.064
1
<0.5
114
NA
4.4
<0.5
1.1
<0.5
162
2.4
<0.1
105
NA
1.9
N
All COIs are below comparative criteria
MR29
04/30/2015
<0.5
<0.5
37
<0.2
<5
<0.08
1.5
1.5
2.9
<0.5
<50
NA
3.2
<0.5
0.69
<0.5
106
<2
<0.1
59
NA
2.9
N
All COIs are below comparative criteria
MR30
02/18/2015
<0.4
0.39 j
30.5
<0.11
<20
<0.06
1
2.74
3.22
<0.03
27
NA
<2
0.67 j
0.61
0.43 j
163
5
<0.06
68
NA
2.24
N
All COIs are below comparative criteria
MR31
07/31/2015
<0.5
<0.5
23.3
<0.2
<5
<0.08
1.6
1.4
1.5
<0.5
<50
NA
0.81
<0.5
<0.5
<0.5
46
<2
<0.1
68
NA
4.7
N
All COIs are below comparative criteria
MR32
02/23/2015
1
<10
<0.1
.72
<10
2 M
Iff_2
3100
NA
13
<5
<5
11
<1
0.1
30
N
A
Invalid dataset; turbidity greater than 10 NTUs
MR32
08/03/2015
<0.5
<0.5
107
<0.2
15
<0.08
5.7
0.41
0.88
<0.5
428
NA
26.9
<0.5
<0.5
<0.5
99.6
<2
<0.1
74
NA
2.2
N
All COIs are below comparative criteria
MR33
05/21/2015
<0.5
<0.5
26.7
<0.2
<5
<0.08
2.9
0.9
1
<0.5
<50
NA
<0.5
<0.5
<0.5
<0.5
46.7
<2
<0.1
57 D6
NA
1.7
N
All COIs are below comparative criteria
MR35
05/21/2015
<0.5
<0.5
18
<0.2
<5
<0.08
1.4
<0.03
<0.5
<0.5
65.4
NA
23.5
1.3
<0.5
<0.5
95
5
<0.1
96
NA
2
N
All COIs are below comparative criteria
MR36
05/22/2015
<0.5
<0.5
<0.3
<0.2
<5
<0.08
2.7
<0.03
<0.5
<0.5
105
NA
0.54
<0.5
<0.5
<0.5
<0.5
11.7
<0.1
75
NA
<1
N
All COIs are below comparative criteria
MR37
05/21/2015
<0.5
<0.5
32.3
<0.2
<5
<0.08
5.3
2.7
2.8
<0.5
<50
NA
4.1
<0.5
<0.5
<0.5
21.9
<2
<0.1
2040
NA
<1
N
Located northwest and upgradient of ash basin. Total dissolved solution
exceedance Dossible from natural source.
MR38
05/22/2015
<0.5
<0.5
91.7
0.21
<5
<0.08
1.5
1.3
1.7
<0.5
<50
NA
5.3
<0.5
0.51
<0.5
36
<2
<0.1
224
NA
<1
N
All COIs are below comparative criteria
MR4
02/05/2015
<1
0.66 j
370
0.19 j
<25
0.12 B
55
<20
<5
0.36 j
1200
NA
30 B
<10
3.5 j
0.3 j
580
<1
<0.5
200 B
NA
<5
N
Located north and upgradient of ash basin. Strontium exceedance
ossible from natural source.
MR40
07/31/2015
<0.5
<0.5
17.4
<0.2
<5
0.09
2.8
0.5
0.56
<0.5
<50
NA
5.1
<0.5
<0.5
<0.5
100
<2
<0.1
97
NA
1.5
N
All COIs are below comparative criteria
MR42
07/31/2015
<0.5
<0.5
35
<0.2
<5
<0.08
4.1
0.63
0.96
<0.5
<50
NA
<0.5
<0.5
<0.5
<0.5
60.3
<2
<0.1
47
NA
<1
N
All COIs are below comparative criteria
MR43
05/28/2015
<0.5
<0.5
43
<0.2
<5
<0.08
1.6
2.4
4.8
<0.5
190
NA
1.9
<0.5
1.2
<0.5
76.3
<2
<0.1
90
NA
3.9
N
All COIs are below comparative criteria
MR44
04/30/2015
<0.5
<0.5
33
<0.2
5.1
<0.08
1.6
0.54
1.2
<0.5
327
NA
0.96
<0.5
<0.5
<0.5
196
<2
<0.1
93
NA
5.1
N
All COIs are below comparative criteria
Rev. 1 Page 1 of 2
23 April 2020

TABLE 6-9
WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY
CORRECTIVE ACTION PLAN UPDATE
MARSHALL STEAM STATION
DUKE ENERGY CAROLINAS, LLC, TERRELL, NC
Analytical Parameter
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium
(VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Molybdenum
Nickel
Selenium
Strontium
Sulfate
Thallium
Total
Dissolved
Solids
Total
Radium
Vanadium
Reporting Units
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
mg/L
pg/L
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/L
15A NCAC 02L Standard
Sx
SO
700
4*
700
2
250
SO
10
1*
300
NE
50
NE
100
20
NE
250
0.2*
500
NE
0.3*
Impacted by
Coal Ash?
Comments
Background Threshold Values (Bedrock Flow Zone)'
0.5
0.6
435
0.2
50
0.08
4.5
3.9
8.3
2.8
792
---
26.6
3.0
7.2
1
253
18.4
0.1
216
5.7
16.0
Background Threshold Values (Bedrock Flow Zone)'
1
1
840
1
50
1
4
8
11
3
1220
11
330
4
8
1
313
22
0.2
195
6
26
Background Data Set Range (Bedrock Flow Zone)
0.11 - 1.25
0.071 j - 2.3
23 - 857
0.01 j - 1.8
25.9 j - 49.1 j
0.054 j - 1.9
1.2 - 4
0.012 j - 11.8
0.23 j - 31
0.026 j - 3.9
16 - 1530
3.8 - 11
1 2.8 j - 385
0.13 j - 6.2
0.33 j - 22.8
0.17 j - 2.3
140 - 407
0.42 j - 23.9
%01669j -
.0
4240
EE005 j,
41654-
0.099j 26.6
Sample ID
Sample Collection Date
Analytical Results
MR45
05/28/2015
<0.5
<0.5
127
<0.2
<5
<0.08
6.2
0.73
1
<0.5
<50
NA
12
<0.5
0.97
<0.5
37.4
<2
<0.1
65
NA
<1
N
All COIs are below comparative criteria
MR46
07/31/2015
<0.5
<0.5
38.7
<0.2
<5
<0.08
1.6
0.6
0.97
<0.5
<50
NA
10.2
<0.5
<0.5
<0.5
45.7
2.3
<0.1
55
NA
1.2
N
All COIs are below comparative criteria
MR47
08/04/2015
<0.5
<0.5
83.5
<0.2
<5
<0.08
1.1
1.3
1.6
<0.5
<50
NA
0.86
<0.5
0.72
<0.5
129
<2
<0.1
50 D6
NA
1.7
N
All COIs are below comparative criteria
MR48
10/23/2015
<0.5
<0.5
58.4
<0.2
<5
<0.08
2.5
0.98 H3
1.4
<0.5
<50
NA
5.4
<0.5
0.52
<0.5
55.8
<2
<0.1
49
NA
1.1
N
All COIs are below comparative criteria
MR6
02/18/2015
<0.5
<2
52.9
<0.5
<50
<0.15
4
<5
<2
<1
<25
NA
<2
<2
<0.5
<2
309
<5
<0.5
119
NA
1.29
N
MR6
08/07/2015
<0.5
<0.5
50.5
<0.2
<5
<0.08
4.7
0.83
1
<0.5
<50
NA
0.92
<0.5
<0.5
<0.5
291
<2
<0.1
103
NA
1.5
All COIs are below comparative criteria
MR8
02/18/2015
<0.5
<2
12.7
<0.5
<50
<0.15
2
<5
<2
<1
<25
I NA
<2
2.8
<0.5
<2
50
<5
<0.5
95
NA
2.65
N
MR8
08/05/2015
<0.5
<0.5
14
<0.2
<5
<0.08
2.2
0.56
0.81
<0.5
<5tNA
1.8
1.9
<0.5
<0.5
44.1
2.6
<0.1
98
NA
2.4
All COIs are below comparative criteria
MR9
02/05/2015
<1
<1
18
<0.4
<25
<0.1
1.3
<20
<5
<5
18
<5
<10
<5
<1
81
<1
<0.5
88
NA
5.8All
MR9
05/20/2015
<0.5
<0.5
17.6
<0.2
<5
<0.08
1
0.68
0.92
<0.5
<5
<0.5
<0.5
<0.5
<0.5
83.5
<2
<0.1
83
NA
6.4
COIs are below comparative criteria
Prepared By: ECW Checked By: CMH
Notes: Revised Feb. 28, 2020
' - Background threshold values were calculated using data from background groundwater samples collected June 2015 to September 2017.
2 - Background threshold values were calculated using data from background groundwater samples collected March 2011 to December 2018.
Bold text - greatest comparative value
- 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
- 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
- highlighted concentration indicates turbidity value is out of range [>10 Nephelometric Turbidity Units (NTUs)] or pH value was not measured. Results are deemed invalid.
* - 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.
NE - not established
NA - not available
mg/L - milligrams per liter
pg/L - micrograms per liter
pCi/L - picocuries per liter
j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
H3 - Sample was received or analysis requested beyond the recognized method holding time.
B - Target analyte detected in method blank at or above the reporting limit. Target analyte concentration in sample is less than 10X the concentration in the method blank. Analyte concentration in sample could be due to blank contamination.
D6 - The precision between the sample and sample duplicate exceeded laboratory control limits.
M3 - Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable.
Rev. 1 Page 2 of 2
23 April 2020