Belews Creek Errata 5-5-20

synTerra
CORRECTIVE ACTION PLAN
UPDATE
REVISION 1: APRIL 23, 2020
Site Name and Location:
Belews Creek Steam Station
3195 Pine Hall Road
Belews Creek, NC 27009
Groundwater Incident No.:
88227
NPDES Permit No.:
NCO024406
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, South Carolina 29601-2567
[phone]
Latitude and Longitude of Facility:
N 36.2819444/W-80.0597222
� i4�rirfrnrei r.yrr
A R '•
z. SE s3�
III.'21, ...'
Ashley' A4of - ,C'2615
't ��''istlFanager
James E` 1 f86f5
St Enthinger
E. o
V l6

FIGURES

900
800
700
00
00
600
Q
Z
V
Z 500
_O
H
Q
W 400
J
W
300
200
100
A --a
(SOUTH)
f STRUCTURAL FILL
COMPLIANCE
BOUNDARY
m m
■ ■ 0
N az
a
FILL
>In —Al
LEGEND
AB 9S
WELL IN SHALLOW ZONE
AB 9D
WELL IN DEEP ZONE
AB 9BR
WELL IN COMPETENT BEDROCK
AB 4S
WELL IN ASH PORE WATER
—
GENERALIZED WATER TABLE
BEDROCK FRACTURE
ORIENTATION
��
GENERALIZED GROUNDWATER
FLOW DIRECTION
��
GENERALIZED ASH PORE
WATER FLOW DIRECTION
0
ASH
0
ASH PORE WATER
FILL
0
SAPROLITE
®
WEATHERED ROCK
BEDROCK
ASH PORE WATER FLOW LAYER
WATER LEVEL ELEVATION
ALLUVIUM OR SAPROLITE FLOW LAYER
GROUNDWATER LEVEL ELEVATION
TRANSITION ZONE FLOW LAYER GROUNDWATER
LEVEL ELEVATION
BEDROCK FLOW LAYER GROUNDWATER
LEVEL ELEVATION
R9-UPID
MEAN ARSENIC (As) CONCENTRATION (pg/L)
Rg
MEAN BERYLLIUM (Be) CONCENTRATION (pg/L)
,1
MEAN STRONTIUM (Sr) CONCENTRATION (pg/L)
�r
MEAN THALLIUM (TI) CONCENTRATION (pg/L)
WELL SCREEN
— — —
COMPLIANCE BOUNDARY
NOTES:
1- ALL CON C EN7RA7I ON5 SHOWN ARE STATISTICAL MEAN OR GEOMEAN
CALC UALTED BASED ON C ENTRAL TEND ANCY OF ❑ATASET USING DATA RANGING
FROM ]ANUARY 2018 TO APRIL 2019.
2. ALL CONCENTRATIONS ARE IN MICROGRAMS PER LITER (N gI L)
3. NO WAN ANALYSIS FOR WELLS AS-2B RD AND GWA-24S FOR CONSTITUENTS;
Arsenic (As), Beryllium (Be), strontium (5r) AND Thallium (TI)
4. SFMW-2D IS PART OF THE 50 LID WASTE STIR LICTII MAIL FILL MONITORING
NETWORK. THIS UNIT IS NOT CO NTI G UO US WITH THE ASH BAS] N HYDRAULIC
SYSTEM AND 15 PARY 09 A 5EP AR ATE ONGOING SITES 0.55E 5SMENT.
- NO DATA AVAI LAS LE
ANALYTICAL PARAMETER As Be Sr TI
REPORTING UNITS PWL 1,9/L pg/L pg/L
SSA NCAC 02L STANDARD 10 9' NE 02'
BACKGROUND THRESHOLD VALUE 1 0.3 46 0.2
(SHALLOW ROW ZONE)i
BACKGROUND THRESHOLD VALUE
(DEEP FLOW ZONE)' 1 0.1 73 0-1
BACKGROUND THRESHOLD VALUE 2 0.2 99 0.1
(BEDROCK ROW ZONE)'
- INTERIM MAII IMUM ALLOWABLE CONCENTRATIONS ([MACS) OF THE 15A NCAC
021- STANDARD APPENDIX 1, APRIL 1, 2013.
IBAC KG ROUND THRESHOLD VALUES WERE CALCULATED USING DATA FROM
BACKGROUND GROUNDWATER SAMPLES COLLECTED MAY 2015 TO DECEMBER 2018
AS $VBMI TTEO IN ]LINE 2019.
- A'
(NORTH)
DAN RIVER
900
800
700
600 `0
Q
Z
V
500 Z
_O
H
Q
400 W
J
W
300
200
100
CROSS SECTION LOCATION
Rev. 1
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f ! .�`Arc,� A 8O NOTES:
11,90
80 /
780
850
840 �4 r1F1.f !, l rl� rf 0
900 h
Hoo
.O T90 840790 p �.
°�,I �� l �4�/f _ \, __ ..� - 00° � �Jf �iY' /r�r. {I ... .� 111 � ► 1a
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pQ'.. - �'"' \ r/ L800 s0 • 820` 1� 800
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770 O •, I \\NEN 7q0
880
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a0
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Sao 081 ♦ 680 gj0 B60
820 830 6 `
L S .I
1p0 740
T'0 Y
GRAPHIC SCALE
epO +
'80
�4 DUKE
ENERGY
500 0 500 1,000
FIGURE 6-11a
ISOCONCENTRATION MAP
870ago 8S0 >80 78p ff
770
CAROLINAS
(IN FEET)
ARSENIC IN DEEP FLOW ZONE
DRAWN BY:C.WYATT DATE:11/12/2019
REVISED BY: C. WYATT DATE: 02/26/2020
790 -- -
>6p y •_.6O r�-+� -_ re�
8o0 r . f
CORRECTIVE ACTION PLAN UPDATE
R
g1° g20 B00 ,770 `�2,0
r
7.80.....'d°ram --_. --
Teo =~
CHECKED BY: A.ALBERT DATE:02/26/2020
APPROVED BY: A. ALBERT DATE: 02/26/2020
BELEWS CREEK STEAM STATION
BELEWS CREEK, NORTH CAROLINA
� SO/ 790
`,
- L
PROJECT MANAGER: A.ALBERT
780 lap °
�ry
160
r�� a. < i
s)mTerra
www.synterracorp.com
Rev. 1
23 April 2020

720 , , ' 790
�••
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�r'� NOTES:
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80 >80 -780-- I
1 �
850 .:� , ♦ op -�780
f °'0 sao
820 900"j i r 800
fj 0 f
r' AO
8O >90 790
.�
870
%
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, I 81 g2°
ROAD ■ 6 O 0
S ® >y
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78 730 g10 �r + l ® 740
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+■ .+ Vf I I
>>0 g80
1^p 8a Oo f �� .- �6p ❑ 1 11° �I�p ,• ~ - >Q0 0
880 °00 880 15
` 820 830
R So 0 \\�Q' • �{� I*
1g OOp I 1A0•
740
GRAPHIC SCALE
ME
740
>60
740
DUKE
500 0
500 1,000
FIGURE 6-12a
ISOCONCENTRATION MAP
ENERGY
°70 g3o °S >8p 790 ��
CAROLINAS
(IN FEET)
BERYLLIUM IN SHALLOW FLOW ZONE
DRAWN BY: C. WYATT
DATE: 11/12/2019
77o
790 0 •
` _
,6p y .I
CORRECTIVE ACTION PLAN UPDATE
'
g00 0 o
►-` °
p 82 Boo ,770 7„7` 780 80. --_. - _- --
g1 ° ---�� �•`
`;; `
REVISED BY: C. WYATT
CHECKED BY: A.ALBERT
DATE: 02/25/2020
DATE:02/25/2020
BELEWS CREEK STEAM STATION
\p Igo , .
O SO
��
r' -.
APPROVED BY: A.ALBERT
DATE:02/25/2020
BELEWS CREEK, NORTH CAROLINA
780 Igo / 790
1po
s` Terra
PROJECT MANAGER: A. ALBERT
n—
www.s nterracor .com
Rev. 1
23 April 2020

�r ■
°ryp 640 610 y600� y �650 y 660 I �2 710 l0 f '�,1 7
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5 •`.�'� .,'`. LEGEND
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r \
88
0
8eo i 860
gj0 860
820
o 780
O P�� • � L S
740
GRAPHIC SCALE
740
DUKE
500 O 500 1,000
FIGURE 6-12b
ENERGY
ISOCONCENTRATION MAP
870 g30 "SO '8p 78=1►-
CAROLINAS
(IN FEET)
BERYLLIUM IN DEEP FLOW ZONE
DRAWN BY: C. WYATT DATE: 11/12/2019
770 - -
790 ` _ y ~
760 -'so•
CORRECTIVE ACTION PLAN UPDATE
6o0 1 • !� w r - -
-.V 800 70 �u> ` �7'p�'a0r �r - } '60
REVISED BY: C. WYATT DATE: 02/18/2020
CHECKEDBY: A. ALBERT DATE:02/18/2020
BELEWS CREEK STEAM STATION
g,Lg '-
,p 190 .
,o
APPROVED BY: A. ALBERT DATE:02/18/2020
BELEWS CREEK, NORTH CAROLINA
780 g 780 790 1g0
I PROJECT MANAGER: A. ALBERT
synTerra
www.synterracorp.com
■ - . ..
Rev. 1
23 April 2020

•
,gyp 840 610 %��600�� �030 • 660
y3o Sao 56o
600 I 590 6S° 620
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ro y �, r•.. Ohl \kk-
. v ---
''0.7°840
Aa10
•
- - ■f •-• • _ ;. .; � , '-- s '� 74o
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•
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•. 0 y° a
7g0 It. 730 i I • , • , • O 1� aT0 RO� µ ~yo 740 •
770 so
8 r= r 1 Ji g "o
ai0 860 860 SO 860
• 'B
■ 836 � ROP
6zo >y 780
1 6y° 7 A0 740
>O 8p0 ,o GRAPHIC SCALE
° DUKE 500 0 500 1,000 FIGURE 6-16
ENERGY ISOCONCENTRATION MAP
790 °7O g0 BS° 40 7So 1r • 776 (INN Feed
3IRON IN DEEP FLOW ZONE
DRAWN BY: WYATTC.
DATE:02/25/2020 CORRECTIVE ACTION PLAN UPDATE
800 760 + - •-'�° � � ^ rw� + � REVISED BY: C. WYATT DATE: 02/25/2020
gzo $20 Soo70 _L7^� �i:p�d°. r' ~ 60 CHECKED BY: A.ALBERT DATE:02/25/2020 BELEWS CREEK STEAM STATION
°1p j90 ,S ■ APPROVED BY: A.ALBERT DATE:02/25/2020 BELEWS CREEK, NORTH CAROLINA
78
0 ig0 7'0 °• 790 760 s)mTerra PROJECT MANAGER: A. ALBERT
O
www.sVnterracorD.com
Rev. 1
23 April 2020

6-0
610
1p
630
600
duo
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O
g40
"o
610
690
6^°
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626
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0 900'� i . L r ):� 800
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'� 880 ■B61 66 19p -
0
gj0 B60
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1° °°° I 1 1A0•.
740
GRAPHIC SCALE
110
1p0
790 670gg0 °So �80 79'0
760 °
800 � ` _ . -'6 R
o g20 Boo ,770 �y�w
g1 \p 190 °ter++�;.-�t�.!
780 ° Igo SO f 790
770
� .. + � �
w78p 'd°+� --_. 60 --
160
DUKE
ENERGY
CAROLINAS
500 0
(IN FEET)
500 1,000
FIGURE 6-19a
ISOCONCENTRATION MAP
STRONTIUM IN SHALLOW FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
BELEWS CREEK STEAM STATION
BELEWS CREEK, NORTH CAROLINA
DRAWNBY:C.WYATT.WYA DATE:02/26/2020
REVISED BY: C. WYATT DATE: 02/26/2020
CHECKED BY: A.ALBERT DATE:02/26/2020
APPROVED BY: A.ALBERT DATE:02/26/2020
PROJECT MANAGER: A. ALBERT
��
s` Terra
www.synterracorp.com
Rev. 1
23 April 2020

otO 640 610 r60 + �630 r • 660 ; )° 710 ) • 790 >60 -
r r 7O RMMI���
.�0 17ao ..Oa1i,68p �S ♦ $600 646620 �'r >>0 740
5g0 bryo � � � 0 .. I ' • • I I Q • >p
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R`ON LDDP,_ y820 810 I� ■
820 � S0
l
590 620 4• ` _ 790870 0ti
6901-, tto.._:�,�� I LEGEND
f 759
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1 60 �v I - >� n—• - .-�- I
70
♦ ` f
750
730 l • O' 40
760
>40720
800
>90 >6'0 , - ' goo.
p0 790 _
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► r �. ffr j
o° � �2 \� ' + - fie° ► � f J 110
P F 13 °
`J .tea' ■ W Rsr
1-770 ® NOTES:
710 � , NT O
600 110
780
�_ J ..1w f r 8 8 g0 900(Jj/ t 1
> )] 1 �` _ 8 1p` I .O -' 0 >90 790
1ti° 'f r ���\�\ \ 1 Z�� { i j 1 I .. / - : - :� I . ►� tij �• • NO 740
870 O ''�Y�� /� \ , ,�, ■=8 870 �r;i680
800
1g0 yy _ w►•rrr w► 6 6j0 gy0
a i
)9O TA w � 860 60 $r;0 � 0
>4
o 0.0 >
150 730 y ' • . / / g° 1T\ g10 �\. ROE gb° E 4pERMEEME
770 AO f• / \ •\NEN ® 790
8g0 r ► �+ P
�y 0rO° po
gbt
880 d0 86o
gj0 860
820 O
1p0 740
° 6po GRAPHIC SCALE
`� ENTRATION MAP
�' D�jj(� 500 0 500 1,000 FIGURE 6-19c
670 830 >6p 780110° ENORGY (IN FEET) STRONTIUM INISOCONBEDROCKFLOW ZONE
790 6so - r-:->8 '� DRAWN BY: C. WYATT DATE:11/12/2019 CORRECTIVE ACTION PLAN UPDATE
800 760 ` * - + + - J �7,-F'••� REVISED BY: C. WYATT DATE: 02/18/2020
82o g20 800 no s�>' �Tp�'aor+r+:• CHECKED BY. A. ALBERT DATE:02/18/2020 BELEWS CREEK STEAM STATION
1p 7go � . APPROVED BY: A. ALBERT DATE:02/18/2020 BELEWS CREEK, NORTH CAROLINA
780 $ 180 6O 4 790 160 synTerrd PROJECT MANAGER: A. ALBERT
$o
■ - . .. www.synterracorp.com
Rev. 1
23 April 2020

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:1 [E] El
1 I F•
�� . 770 � 75 \❑�' ' ❑
► � 1bo
l � -
1
77oIL
■ . .
� e ► � a1 '4°
i Qy r
♦ �� � � J Q[yI 1yp
5o° F ` A
'9p y I [790T00��
O ✓/
16
770No
� r j" : �,1 1q0 FR STFgMpt N 1
' 910 ;,go
� Jg •�-- i
o
J80 e i 14° } NOTES:
J8p 760 /J V
rf °jo
❑� rj1 h )� 800
'>90 7901A0
°❑t 1
i f � 810
740
820
_ [ [ p�
.[ 9 �L ROB r^ • by0
■ -� p1NE
lie
889
gj0 860 1 0
. 8`70 lie
780
1
800
T °
80 780 77 760
-' �� 760
-770 - 7 7 o rr r7� : o ..-• f
sO' 790 100 I
bry0 `
DUKE 0
ENERGY
CARCUNIA::.
740 ® 0
1ao
'Qo
1p0
74(
GRAPHIC SCALE
0 500 1,000
(IN FEET)
DRAWN BY: C. WYATT DATE: 11/12/2019
REVISED BY: C. WYATT DATE: 02/26/2020
CHECKED BY: A. ALBERT DATE: 02/26/2020
APPROVED BY: A. ALBERT DATE: 02/26/2020
PROJECT MANAGER: A. ALBERT
790
78 0
7q0
740
730
FIGURE 6-20b
ISOCONCENTRATION MAP
TOTAL DISSOLVED SOLIDS
IN DEEP FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
BELEWS CREEK STEAM STATION
BELEWS CREEK, NORTH CAROLINA
Rev. 1
23 April 2020

6-0
6,o
1p
G
580
050
5g0
600
590
0y0
el0
°°O
O
640
660
560
510
500
6^0
610
590
s20
0p0
Sao
610
°40
7,0
1p0
>30
750
730
110
1p0
`Qo
720
68,
'oo
>8 °
680
r µ 630 r 660 I 710 '
780
400
690 690♦�i/ J >>O 19p _y,11 , >> �O 8io
� • 000
A 1111062
111 690 700 0 f 78
10 1 i
I p 660 � -MIDDLET -� 1 '� ..I• � {{
°O 1yp 6S0 "`—oNLOOpi y820
ilk820 •
900~%;p 8,0`�
■ / ���_90 �870 °ry0 I
1°p 720
■�`!780
• 7o
it
IL 0
■
7 + �.
71
I 770 / • �
V—���1 "jf�f��
s 1g0 o tiC
820 900�
66 �f
870
O
r
g0 y2�
9 f
0 ' 1
78 730 0
770
860
10 880 000 C�
1 860 8G
810
1 820
100 >9O
>>o
870
6g0
790
Soo
g20
800
81 p
780
180
r :4
■
a
ao�1 ' I - I • I I � ��I
e 10
go
770
7
�p
1q0 sTFgMptgN
rRo
>No
rL
>90
A60 7�� ■ "j 40
>8p � v 810
1 r'I 800
• r 'TO 840 I �00 >90 790
746
�p 830 i 63 d3 J// w r
f! t`0 �• 930
•° "tin .p � � � .86� r.N� r8S0
9p0 81p �r r
r ► �rrP`N�I� RO $50
660
••�'� �r
0
r
B60
0
830
i >8°
I I
� � L
>
ss '�
°
790 77 790 110
_ - -
°§°
O>O
I
1a0
,70NQ,
160 '
i�
S0 {�
10
,,.-
■4 DUKE 500 GRAPHIC SCALE500 1,000
ENERGY
CAROLINAS (IN FEET)
DRAWN BY: C. WYATT DATE: 11/12/2019
REVISED BY: C. WYATT DATE: 02/26/2020
CHECKED BY: A. ALBERT DATE: 02/26/2020
APPROVED BY: A. ALBERT DATE: 02/26/2020
PROJECT MANAGER: A. ALBERT
�40
790
>80
>40
740
730
`` o
LEGEND
FIGURE 6-21b
ISOCONCENTRATION MAP
THALLIUM IN DEEP FLOW ZONE
CORRECTIVE ACTION PLAN UPDATE
BELEWS CREEK STEAM STATION
BELEWS CREEK, NORTH CAROLINA
Rev. 1
23 April 2020

TABLES

TABLE 4-3
BACKGROUND VALUES FOR GROUNDWATER
CORRECTIVE ACTION PLAN UPDATE
BELEWS CREEK STEAM STATION
DUKE ENERGY CAROLINAS, LLC, BELEWS CREEK, NC
Constituent
Reporting
Unit
15A NCAC 02L
Standard
2018 Background
Threshold Values'
2019 Updated Background
Threshold Values
Piedmont
Background
Threshold Value
Range3
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
5.1-6.0
5.2-7.0
6.3-6.5
5.2-6.0
5.6-7.0
6.2-8.4
3.6-9
Alkalinity
mg-CaCO,/L
NE
23
64
81
20
53
91
19 - 379
Aluminum
I pg/L
NE
860
140
100
805
204
120
100 - 1,238
Antimony
pg/L
1*
1
1 1
1
1
1
1
0.5 - 2.9
Arsenic
pg/L
10
1
1
1
1
1
2
0.2 - 6.35
Barium
pg/L
700
58
13
6
123
16
11
10.52 - 840
Beryllium
pg/L
4*
0.4
0.2
0.2
0.3
0.1
0.2
0.0625 - 1
Bicarbonate
mg-CaCO,/L
NE
22
63
78
24
54
91
19- 388
Boron
pg/L
700
50
50
50
50
50
50
50 - 176.8
Cadmium
pg/L
2
1
1
0.08
1
0.08
0.08
0.08- 1
Calcium
mg/L
NE
4
13
10
8
14
26
4 - 111
Carbonate
mg-CaCO,/L
NE
5
5
5
5
5
5
5- 10
Chloride
mg/L
250
15
21
3
19
19
3
3.34 - 250
Chromium
pg/L
10
5
3
5
11
3
11
1-26
Chromium (VI)
pg/L
10
2
0.4
0.3
4
0.6
0.4
0.03 - 12
Cobalt
pg/L
1*
0.5
2
0.8
0.6
2
0.8
0.088 - 88.85
Copper
pg/L
1000
3
5
10
2
5
17
0.5 - 17.15
Fluoride
mg/L
2
---
---
---
0.1
0.1
0.6
0.1 - 1.8
Iron
pg/L
300
750
240
228
1,600
226
341
56.3 - 37,500
Lead
pg/L
15
1
1
0.1
1
0.6
0.2
0 - 2
Lithium
pg/L
NE
---
---
---
2
95
30
2 - 95.39
Magnesium
mg/L
NE
3
7
3
4
7
4
1- 45
Manganese
pg/L
50
23
13
10
40
57
64
7-9,170
Mercury
pg/L
1
0.2
0.2
0.2
0.2
0.2
0.2
0.05 - 0.5
Methane
pg/L
NE
3
3
10
3
10
10
1 - 2,505
Molybdenum
pg/L
NE
1
1
4
0.5
2
6
0.5- 26.2
Nickel
pg/L
100
4
5
3
8
5
7
0.87 - 48
Nitrate + Nitrite
mg-N/L
NE
4
4
0.2
3
4
0.2
0.02 - 6.3
Potassium
mg/L
NE
5
5
5
5
19
5
1.609 - 18.8
Selenium
pg/L
20
0.5
0.5
0.5
1
0.5
0.5
0.5 - 2.4
Sodium
mg/L
NE
6
11
12
7
11
15
6 - 190
Strontium
pg/L
NE
57
69
100
46
73
99
27 - 2,120
Sulfate
mg/L
250
2
6
10
2
8
15
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
85
148
133
93
134
181
50 - 1,200
Thallium
pg/L
0.2*
0.2
0.2
0.1
0.2
0.1
0.1
0.1 - 0.2
TOC
mg/L
NE
1
1
10
3
6
4
1- 12.3
Total Radium
pCi/L
5^
9
1
0.5
2
4
4
0.494 - 35
Total Uranium
pg/mL
0.03^
0.0005
0.0005
0.0005
0.0005
0.0005
0.002
0.0002 - 0.864
Vanadium
pg/L
0.3*
1
1
1
3
2
2
0.33 - 25.8
Zinc
I pg/L
1 1000
1 10
43
16
39
23
41
5 - 140
Prepared by: HES Checked by: JHG
Revised by: DAA
Notes:
- Background threshold values were calculated using data from background groundwater samples collected June 2015 to April 2017
- Updated background threshold values were calculated using data from background groundwater samples collected October 2010 to December 2018 and submitted to
NCDEQ June 2019
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 Station', Belews Creek Steam Stations, Buck Steam Station4, Cape Fear Steam Electric Plant4, Cliffside Steam
Stations, Dan River Steam Station4, Marshall Steam Stations, Mayo Steam Electric Plants, Riverbend Steam Station4, and Roxboro Steam Electric Plants).
2018 background threshold values approved by North Carolina Department of Environmental Qualtity( NCDEQ) on May 14, 2018
Background threshold values have been rounded to similar levels of precision as 15A North Carolina Administrative Code (NCAC) 02L Standard or Interim Maximum
Allowable Concentration (IMAC).
--- - 2017 background threshold value was not calculated for constituent.
* - IMAC of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013.
^ - Federal Maximimum Contaminant Level
pg/L - micrograms per liter
pg/mL - micrograms per milliliter
mg/L - milligrams per liter
mg-CaCO3/1- - milligrams calcium carbonate per liter
mg-N/L - milligrams nitrogen per liter
NE - not established
pCi/L - picocuries per liter
S.U. - standard units
TDS - total dissolved solids
TOC - total organic carbon
Rev. 1
Page 1 of 1
23 April 2020

TABLE 6-5
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO APRIL 2019
CORRECTIVE ACTIVE PLAN UPDATE
BELEWS CREEK STEAM STATION
DUKE ENERGY CAROLINAS, LLC, BELEWS CREEK, NC
Analytical Parameter
pH
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium (VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Thallium
Total Dissolved Solids
Vanadium
Reporting Units
S.U.
Ug/L
ug/L
pg/L
pg/L
ug/L
ug/L
mg/L
pg/L
ug/L
ug/L
ug/L
Ng/L
ug/L
ug/L
ug/L
ug/L
mg/L
pg/L
mg/L
ug/L
15A NCAC 02L Standard
6.5-8.5
1*
SO
700
4*
700
2
250
10
SO
1*
300
NE
50
NE
20
NE
250
0.2*
500
0.3*
2018 Background Threshold Values (Shallow Flow Zone)'
5.1-6.0
1
1
58
0.4
50
1
15
2
5
0.5
750
NE
23
1
0.5
57
2
0.2
85
1
2019 Background Threshold Values (Shallow Flow Zone)Z
5.2-6.0
1
1
123
0.3
50
1
19
4
11
0.6
1600
2
40
0.5
1
46
2
0.2
93
3
2019 Background Dataset Range Shallow Flow Zone)2
5.3-5.9
0.1-1.1
1 0.04-1
19-124
0.03-0.6
2.5-50
0.03-1.0
1.2-18.8
0.2-2.7
0.5-11.7
0.02-1.3
1 22-11,100
0.39-2
1 3-189
0.1-1.3
0.1-1.4
7.9-48
0.1-2.4
0.02-0.2
20-90
0.1-6.4
2018 Background Threshold Values (Deep Flow Zone)'
5.2-7.0
1
1
13
0.2
50
1
21
0.4
3
2
240
NE
13
1
0.5
69
6
0.2
148
1
2019 Background Threshold Values (Deep Flow Zone)Z
5.6-7.0
1
1
16
0.1
50
0.08
19
0.6
3
2
1 226
95
57
2
0.5
73
8
0.1
134
2
2019 Background Dataset Range (Deep Flow Zone)2
5.6-7.0
0.1-1.5
0.05-1.1
0.004-0.2
0.01-0.02
11.9-58.8
0.03-0.2
2.0-20.3
0.03-0.5
0.1-5.0
0.02-1.8
13-850
2.2-52.2
2.5-104
0.1-5.3
0.2-3.7
29.3-87.8
0.5-11
0.02-0.1
25-126
0.1-1.4
2018 Background Threshold Values (Bedrock Flow Zone)'
6.2-8.4
1
1
6
0.2
50
0.08
3
0.3
5
0.8
228
NE
10
4
0.5
100
10
0.1
133
1
2019 Background Threshold Values (Bedrock Flow Zone)Z
6.3-6.5
1
2
11
0.2
50
0.08
3
0.4
11
0.8
341
30
64
6
0.5
99
15
0.1
181
2
2019 Background Threshold Values Bedrock Flow Zone)21
6.2-8.4
0.1-1.4
0.1-1.5
3.0-11
0.01-0.2
33.3-50
0.03-0.1
2.3-3.2
0.03-0.3
0.5-34.7
0.03-0.8
27-228
3.9-30
3.9-87.1
0.5-3.7
0.4-0.5
32.6-100
2.5-22.5
0.1-0.1
52-250
0.2-2.3
Sample ID Flow Zone
Mean, Geomean, or Median Result;
Background Locations°
BG-01D
Transition Zone
7.5
<0.5
0.52
13
0.10
51
0.096
12
0.29
0.74
0.49
135
52.4
64
<0.5
<0.5
89
6.7
<0.1
209
<0.3
BG-01S
Shallow
5.5
<0.5
0.083
9.8
0.18
3.6
<0.08
7.6
-
50
1.1
-
4.4
-
1.3
<0.5
-
0.87
0.14
49
-
BG-02BRA
Bedrock
8.7
0.65
0.93
5.5
<0.1
<50
<0.08
3.1
0.12
1.5
0.19
103
35
39
8.4
<0.5
79
14
<0.1
154
0.69
BG-02D
Transition Zone
6.6
<0.5
<0.1
5.8
<0.1
<50
<0.08
18
0.20
0.69
0.11
<50
15
<5
2.0
<0.5
38
2.6
<0.1
123
1.2
BG-02S
Shallow
5.8
<0.5
0.11
77
0.10
<50
<0.08
13
2.2
2.3
0.11
357
2.5
12
0.72
<0.5
34
0.76
<0.1
71
0.98
BG-03D
Transition Zone
6.0
<0.5
0.084
12
<0.1
<50
<0.08
4.9
0.045
<0.5
<0.1
75
2.5
5.8
<0.5
<0.5
46
<1
<0.1
70
0.51
BG-03S
Shallow
1 5.4
<0.5
<0.1
40
1 0.25
<50
1 <0.08
2
0.42
1.1
1 0.12
1 261
1 1.5
1 14
<0.5
<0.5
1 27
1 <1
I <0.1
52
0.48
MW-202BR
Bedrock
6.4
<0.5
0.17
<5
<0.1
<50
<0.08
2.7
0.21
1.4
<0.1
<50
4.2
<5
0.57
<0.5
34
3.7
<0.1
<250
0.48
MW-202D
Transition Zone
6.0
<0.5
<0.1
<5
<0.1
<50
<0.08
2.5
0.25
0.60
<0.1
<50
3.3
<5
<0.5
<0.5
38
1.5
<0.1
<250
0.39
MW-202S
Shallow
5.7
<0.5
<0.1
24
0.19
<50
<0.08
1.4
1.0
1.2
<0.1
<50
<0.5
<5
<0.5
<0.5
11
<1
<0.1
<250
0.30
At or Within the Waste Boundary Locations
AB-01BR
Bedrock
7.2
<0.5
1.0
129
0.11
5,630
<0.08
340
0.033
2.5
1.0
2,400
93
707
3.7
<0.5
824
7.6
<0.1
723
0.21
AB-01BRD
Bedrock
12.3
-
-
-
-
422
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
AB-01D
Transition Zone
5.6
<0.5
3.3
160
0.63
9,265
0.53
396
0.034
2.0
35
156
5.9
1,833
0.68
1.5
590
117
0.37
914
0.13
AB-01S
Shallow
5.9
<0.5
3.9
86
0.094
10,240
0.25
392
0.032
1.3
29
231
0.9
1,865
0.31
1.0
680
141
0.32
962
0.21
AB-02BR
Bedrock
8.0
-
-
103
0.48
8,870
1.0
410
1.1
1.4
83
8.5
104
12,200
1.5
-
1,660
53
0.17
1,100
0.33
AB-02BRD
Bedrock
12.2
-
-
-
-
20.2
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
AB-02D
Transition Zone
5.8
1 1.1
2.2
1 92
0.57
9,552
1 0.49
408
1 <0.025
1.6
70
1,012
11.3
9,030
1 0.76
0.67
678
75
0.50
922
<0.3
AB-02S
Shallow
6.6
<0.5
1.7
23
<0.1
50.7
<0.08
6.3
0.14
1.0
1.2
231
0.7
528
2.0
<0.5
34
6.9
0.15
95.4
10
AB-03BR
Bedrock
11.1
-
-
-
-
538
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
AB-03D
Transition Zone
7.2
<0.5
15.4
8.0
<0.1
2,836
<0.08
292
<0.025
1.9
2.8
445
198
91
5.3
<0.5
436
33
<0.1
721
0.24
AB-03S
Shallow
6.3
<0.5
0.97
131
0.087
10,510
<0.08
378
<0.025
0.76
9.0
412
0.7
3,538
5.6
0.41
666
118
0.49
919
0.37
AB-04BR
Bedrock
7.5
<0.5
0.48
6
<0.1
<50
<0.08
1.8
0.15
<0.5
<0.1
<50
11
17
3.9
<0.5
86
5.5
<0.1
<250
2.4
AB-04BRD
Bedrock
8.9
<0.5
0.75
5.4
<0.1
1 <50
<0.08
1.1
0.035
<0.5
<0.1
<50
6.6
11
7.3
1 <0.5
64
14
<0.1
1 143
<0.3
AB-04D
Transition Zone
6.2
1 0.21
3.4
23
<0.1
56
<0.08
3.3
1 0.69
0.72
0.094
1 71.4
12
162
4.3
0.64
159
3.0
<0.1
172
4.2
AB-04LOWERASH
Ash Pore Water
9
7.1
409
47
<0.1
1,015
0.14
18
0.063
<0.5
0.10
176
26
22
963
2.7
498
77
<0.1
361
2.4
AB-04S
Ash Pore Water
7.1
<0.5
101
135
<0.1
15,850
<0.08
544
0.025
0.57
0.071
10,564
76
819
16
<0.5
1476
214
<0.1
1,376
<0.3
AB-04SAP
Shallow
5.7
0.37
2.6
99
0.17
91
<0.08
3.9
0.52
0.88
0.67
94
7.5
131
1.5
1.1
195
3.7
0.38
158
5.3
AB-04SL
Ash Pore Water
10.8
-
-
-
-
14,000
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
AB-O5D
Transition Zone
6.6
<0.5
0.90
10
<0.1
<50
<0.08
0.88
0.43
0.71
0.095
79
4.5
1 6.6L30
0.67
50
4.4
<0.1
<250
3.4
AB-05S
Ash Pore Water
8.1
<0.5
100
224
0.11
7323
<0.08
327
<0.025
<0.5
0.11
1,002
75
1,098<0.5
1,260
186
<0.1
849
0.24
AB-05SL
Ash Pore Water
10.1
6.6
57
197
<0.1
12,008
<0.08
330
<0.025
0.97
0.045
<50
217
<54.1
3475
206
0.038
1465
157
AB-06D
Transition Zone
6.6
<0.5
0.088
19
<0.1
<50
<0.08
1.4
0.31
0.43
<0.1
50
3.5
<5<0.5
56
3.4
<0.1
<250
3.5
AB-06S
Ash Pore Water
6.6
0.81
3.9
209
<0.1
115
<0.08
4.7
0.085
0.70
1.1
582
12
152.2
124
20
<0.1
<250
3.2
AB-06SL
Ash Pore Water
6.9
<0.5
5.9
223
<0.1
507
<0.08
7.4
<0.025
0.57
<0.1
2,482
43
116<0.5
735
<1
<0.1
<250
0.67
AB-07D
Transition Zone
6.7
<0.5
0.19
20
<0.1
<50
<0.08
4.8
0.069
0.25
0.09
153
1 9.3
25
<0.5
42
12.0
<0.1
<250
1.0
AB-07S
Ash Pore Water
5.1
<0.5
30
30
1.2
2,315
0.68
108
0.030
1.2
34
53,040
56
2,768
1.9
1.7
1 494
320
1 3.1
765
0.61
AB-08D
Transition Zone
6.1
<0.5
0.92
8.2
<0.1
<50
1 0.04
15.6
1 0.029
0.79
0.36
66
15
37
0.22
<U.5
<1
<0.1
<250
0.41
AB-08S
Ash Pore Water
5.6
1 0.74
2.1
1 125
0.32
3,871
0.51
128
0.028
0.45
12
1,254
37
165
6.9
11
467
69
4.3
401
1.4
AB-08SL
Ash Pore Water
6.8
0.22
259
335
0.11
6,733
<0.08
7.4
<0.025
1.8
0.52
56,475
45
1,030
80
0.56
1,187
6.8
0.064
376
23
AB-09BR
Bedrock
7.7
<0.5
16
14
<0.1
<50
<0.08
4.4
0.029
0.54
0.071
1,024
12
585
1.9
<0.5
115
4.8
<0.1
179
<0.3
AB-09D
Transition Zone
7.3
0.25
3.3
5.3
<0.1
72.3
<0.08
5
<0.025
0.45
0.18
289
6.6
95
8.2
<0.5
71.2
13
<0.1
205
0.22
AB-09S
Shallow
5.2
<0.5
0.094
52
0.11
<50
<0.08
6.2
0.066
0.46
16
241
0.7
559
<0.5
<0.5
6.8
1 <1
0.12
34
<0.3
CCR-01D
Transition Zone
6.9
<0.5
9.1
5.7
<0.1
11
<0.08
26
-
1.3
0.78
-
78
-
3.8
0.57
-
20.1
<0.1
155
-
CCR-01S
Shallow
4.8
<0.5
1 0.47
54
0.38
1 28
0.083
1 17
-
1.0
8.7
-
7.3
-
<0.5
0.30
-
<1
0.14
45
-
CCR-02D
Transition Zone
5.2
<0.5
1.4
16
1.2
3,862
0.97
237
0.060
<0.5
7.5
<50
72
2,605
<0.5
<0.5
621
3.0
<0.1
477
<0.3
CCR-02S
Shallow
4.3
<0.5
15
411
2.7
6,266
0.36
292
0.028
4.3
256
109
9.1
6,350
<0.5
15
25
36
0.80
575
<0.3
CCR-04D
Transition Zone
7.1
<0.5
1.8
49
<0.1
6,685
<0.08
386
-
1.8
JEW
-
218
-
2.3
<0.5
-
27
<0.1
866
-
CCR-04S
Shallow
5.2
<0.5
1.3
275
2.4
7,793
0.65
291
-
1.5
9.0
-
12
-
<0.5
1.8
-
46
0.65
1 563
-
CCR-05D
Transition Zone
12
-
-
-
-
55
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
CCR-05S
Shallow
1 5.5
<0.5
2.3
164
1 0.28
10,630
1 0.1
398
1
<0.5
35
3.6
<0.5
2.5
125
0.36
941
CCR-06D
Transition Zone
5.5
<0.5
0.80
195
0.88
10,825
0.51
404
-
0.54
15
-
10
-
<0.5
1.4
-
110
0.52
892
-
CCR-07D
Transition Zone
6.5
<0.5
0.26
17
<0.1
5,148
<0.08
317
-
<0.5
1.1
-
59
-
<0.5
<0.5
-
32
<0.1
761
-
CCR-07S
Shallow
4.8
<0.5
0.13
1 162
3.9
84
0.26
82
<0.5
16
7.4
<0.5
<0.5
<1
0.26
183
Rev. 1
Page I of
23 April 2020

TABLE 6-5
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO APRIL 2019
CORRECTIVE ACTIVE PLAN UPDATE
BELEWS CREEK STEAM STATION
DUKE ENERGY CAROLINAS, LLC, BELEWS CREEK, NC
Analytical Parameter
pH
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium (VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Thallium
Total Dissolved Solids
Vanadium
Reporting Units
S.U.
Ug/L
ug/L
pg/L
pg/L
ug/L
ug/L
mg/L
pg/L
ug/L
ug/L
ug/L
Ng/L
ug/L
ug/L
ug/L
ug/L
mg/L
pg/L
mg/L
ug/L
15A NCAC 02L Standard
6.5-8.5
1*
SO
700
4*
700
2
250
10
SO
1*
300
NE
50
NE
20
NE
250
0.2*
500
0.3*
2018 Background Threshold Values (Shallow Flow Zone)'
5.1-6.0
1
1
58
0.4
50
1
15
2
5
0.5
750
NE
23
1
0.5
57
2
0.2
85
1
2019 Background Threshold Values (Shallow Flow Zone)Z
5.2-6.0
1
1
123
0.3
50
1
19
4
11
0.6
1600
2
40
0.5
1
46
2
0.2
93
3
2019 Background Dataset Range Shallow Flow Zone)2
5.3-5.9
0.1-1.1
1 0.04-1
19-124
0.03-0.6
2.5-50
0.03-1.0
1.2-18.8
0.2-2.7
0.5-11.7
0.02-1.3
1 22-11,100
0.39-2
1 3-189
0.1-1.3
0.1-1.4
7.9-48
0.1-2.4
0.02-0.2
20-90
0.1-6.4
2018 Background Threshold Values (Deep Flow Zone)'
5.2-7.0
1
1
13
0.2
50
1
21
0.4
3
2
240
NE
13
1
0.5
69
6
0.2
148
1
2019 Background Threshold Values (Deep Flow Zone)Z
5.6-7.0
1
1
16
0.1
50
0.08
19
0.6
3
2
1 226
95
57
2
0.5
73
8
0.1
134
2
2019 Background Dataset Range (Deep Flow Zone)2
5.6-7.0
0.1-1.5
0.05-1.1
0.004-0.2
0.01-0.02
11.9-58.8
0.03-0.2
2.0-20.3
0.03-0.5
0.1-5.0
0.02-1.8
13-850
2.2-52.2
2.5-104
0.1-5.3
0.2-3.7
29.3-87.8
0.5-11
0.02-0.1
25-126
0.1-1.4
2018 Background Threshold Values (Bedrock Flow Zone)'
6.2-8.4
1
1
6
0.2
50
0.08
3
0.3
5
0.8
228
NE
10
4
0.5
100
10
0.1
133
1
2019 Background Threshold Values (Bedrock Flow Zone)Z
6.3-6.5
1
2
11
0.2
50
0.08
3
0.4
11
0.8
341
30
64
6
0.5
99
15
0.1
181
2
2019 Background Threshold Values Bedrock Flow Zone)21
6.2-8.4
0.1-1.4
0.1-1.5
3.0-11
0.01-0.2
33.3-50
0.03-0.1
2.3-3.2
0.03-0.3
0.5-34.7
0.03-0.8
27-228
3.9-30
3.9-87.1
0.5-3.7
0.4-0.5
32.6-100
2.5-22.5
0.1-0.1
52-250
0.2-2.3
Sample ID Flow Zone
Mean, Geomean, or Median Result'
At or Within the Waste Boundary Locations (Continued)
CCR-08AD
Transition Zone
5.6
<0.5
0.69
204
1.1
9,363
1.8
415
-
0.70
0.81
-
29
-
<0.5
<0.5
-
84
0.17
788
-
CCR-08D
Transition Zone
5.8
<0.5
0.48
50
0.32
10,017
0.73
430
-
<0.5
43
-
60
-
<0.5
<0.5
-
80
0.13
773
-
CCR-08S
Shallow
5.5
<0.5
0.60
175
1.6
9,793
1.2
377
3.7
18
4.8
0.54
0.83
104
0.45
746
CCR-09D
Transition Zone
6.2
<0.5
0.17
5.1
<0.1
42
<0.08
18
-
1.1
0.14
-
16
-
0.86
0.61
-
18
<0.1
150
-
CCR-09S
Shallow
6.0
<0.5
<0.1
21
<0.1
289
<0.08
25
1.8
<0.1
5.2
<0.5
0.51
8.7
<0.1
152
CCR-11S
Shallow
6.3
<0.5
2.4
221
<0.1
6.9
<0.08
22
0.76
32
<2.5
0.66
<0.5
7.4
<0.1
377
CCR-11D
Transition Zone
5.8
0.5
0.25
42
1 0.063
4.5
1 0.08
16
-
0.61
0.96
-
7.6
-
1.11
0.5
-
17
1 0.1
250
-
CCR-12DA
Transition Zone
9.0
0.95
1.4
11
<0.1
4.7
<0.08
2.3
-
1.1
1 0.11
-
27.7
-
6.0
<0.5
1-
21
<0.1
147
-
CCR-12S
Shallow
5.4
<0.5
<0.1
85
0.18
12
<0.08
2.8
-
0.68
<0.1
0.8
<0.5
<0.5
<1
<0.1
41
EXOB-01
Transition Zone
6.7
<0.5
25
24
<0.1
7,845
0.13
381
<0.025
4.3
192
12,772
70
3,180
2.4
<0.5
797
37
<0.1
864
<0.3
EXOB-02
Transition Zone
5.2
<0.5
4.9
218
1.6
8,083
0.69
423
0.043
1.0
139
99
11
4,600
<0.5
5.6
390
93
0.84
989
<0.3
At or Beyond the Compliance Boundary Locations
Upgradient or the Ash Basin
GWA-03D
Transition Zone
6.1
<0.5
0.12
22.3
<0.1
<50
<0.08
9.7
1.0
3.0
0.095
201
2.4
10.3
0.54
<0.5
97.7
<1
<0.1
94
0.79
GWA-03S
Shallow
5.8
<0.5
0.05
64.5
<0.1
<50
<0.08
9
0.23
1.2
0.15
104
<2.5
10.2
1.7
<0.5
109
<1
<0.1
101
0.44
GWA-06D
Transition Zone
7.0
<0.5
2.0
19.5
<0.1
<50
<0.08
4.9
<0.025
0.69
1.2
1,570
7.6
514
5.1
<0.5
120
17.3
<0.1
<250
0.24
GWA-06S
Shallow
5.1
<0.5
0.15
124
1.6
37.6
0.62
8.6
0.89
3.4
0.52
260
3.6
250
0.7
<0.5
34.3
14.1
0.26
<250
0.47
GWA-07D
Transition Zone
7.5
0.78
1.1
14.5
<0.1
<50
<0.08
23.0
0.71
1.1
0.056
100
26.7
<5
8.6
<0.5
251
2.2
<0.1
<250
2.5
GWA-07SA
Shallow
4.8
<0.5
<0.1
189
3.2
69.3
1 0.13
23.8
1 1.1
2.0
12.7
357
4.2
261
<0.5
<0.5
37.8
18.4
0.084
<250
0.68
GWA-08D
Transition Zone
6.9
<0.5
0.29
6.5
<0.1
<50
<0.08
5.5
0.059
0.63
0.10
122
13.1
37.4
4.6
<0.5
1 59.1
11.9
1 <0.1
126
0.81
GWA-08S
Shallow
5.4
<0.5
0.12
1 53.1
0.79
210
0.10
2.8
0.11
0.69
0.16
237
1.1
37.0
<0.5
11.2
230
55.9
<0.1
141
0.48
GWA-09BR
Bedrock
6.6
<0.5
0.26
<5
<0.1
223
<0.08
57.0
0.22
1.8
0.26
128
18.3
135
1.7
<0.5
89.3
2.4
<0.1
<250
0.72
GWA-09D
Transition Zone
6.2
0.30
0.25
9.8
<0.1
<50
<0.08
43.2
0.058
3.1
1.1
126
12.9
17.1
2.7
<0.5
106
4.8
<0.1
<250
0.43
GWA-09S
Shallow
5.3
<0.5
0.47
83.5
0.45
<50
0.075
2.5
0.22
2.0
0.59
647
2.5
19.1
<0.5
<0.5
6.3
<1
0.14
49.5
0.74
GWA-22D
Transition Zone
8.9
1 <0.5
0.91
16.1
<0.1
<50
<0.08
10.9
0.23
0.72
<0.1
56.6
33.6
13.5
5.1
0.51
86.7
7.7
<0.1
146
5.3
GWA-22S
Shallow
5.9
<0.5
<0.1
<5
<0.1
<50
<0.08
2.2
0.31
1.1
0.15
<50
3.0
5.6
<0.5
<0.5
42.2
8.4
<0.1
64.4
1.2
GWA-25BR
Bedrock
8.4
<0.5
0.67
7.3
<0.1
<50
<0.08
2.3
0.034
0.95
<0.1
54.7
4.8
9.7
12.8
<0.5
1 48.2
23.1
<0.1
134
<0.3
GWA-26BR
Bedrock
7.7
<0.5
0.60
12.9
<0.1
<50
<0.08
10.0
0.026
1.0
2.9
228
2.2
104
11.3
<0.5
46.2
3.8
<0.1
<250
0.71
GWA-26D
Transition Zone
5.6
<0.5
<0.1
41.9
0.17
<50
0.19
10.2
0.076
0.76
0.100
140
2.3
17.4
0.58
<0.5
30.3
0.77
<0.1
<250
0.17
GWA-26S
Shallow
5.5
<0.5
<0.1
39.3
0.14
<50
<0.08
6.5
0.057
0.54
<0.1
101
2.6
13.0
<0.5
<0.5
16.2
0.54
<0.1
<250
0.19
LRB-01BR
Bedrock
7.4
<0.5
0.34
5.5
1 <0.1
<50
<0.08
1.8
0.17
0.51
0.38
70.2
15.4
120
1.1
<0.5
46.1
1.4
<0.1
105
4.1
LRB-01D
Transition Zone
6.4
1 <0.5
0.11
20.8
<0.1
<50
<0.08
2.4
22.3
15.0
<0.1
<50
3.0
1 <5
<0.5
0.61
67.3
21.6
<0.1
1 128
6
LRB-01S
Shallow
6.3
<0.5
0.13
73.2
<0.1
<50
<0.08
1.1
8.0
7.9
0.44
196
1.0
23.3
0.29
<0.5
73.1
1 <1
<0.1
100
2.8
LRB-02BR
Bedrock
7.0
<0.5
0.091
4.6
<0.1
<50
<0.08
4.2
0.083
<0.5
<0.1
1 <50
14.5
21.1
2
<0.5
106
2.2
<0.1
156
1.5
LRB-02D
Transition Zone
6.2
<0.5
0.10
15.3
<0.1
<50
<0.08
6.2
0.14
0.73
1.4
59.4
6.8
10.1
0.88
<0.5
149
1.2
<0.1
135
1.1
LRB-02S
Shallow
5.8
<0.5
0.053
82.1
0.083
<50
<0.08
13.8
0.15
0.90
0.27
116
<2.5
59.9
<0.5
<0.5
80.1
<1
<0.1
119
0.32
MW-01
Shallow
5.2
-
-
20.5
0.11
<50
-
2.2
0.65
1.0
263
-
34.0
-
-
-
0.57
0.14
<25
-
MW-01D
Bedrock
6.5
-
3.5
0.028
<50
1
8.1
0.83
0.72
28.0
28.1
0.86
0.11
76.3
0.51
MW-02
Shallow
5.9
0.37
-
73.4
0.36
60.3
3.7
-
2.4
0.36
724
31.9
-
-
-
0.41
0.16
60.5
0.81
MW-03
Shallow
5.6
<0.5
0.22
54.4
0.17
<50
<0.08
7.5
1.5
4.2
0.19
127
1.8
8.0
<0.5
<0.5
34.3
1.0
1 <0.1
44.7
0.65
MW-04
Shallow
5.9
<0.5
0.10
3.9
<0.1
746
<0.08
2.7
10.7
13.3
0.23
432
<2.5
8.5
<0.5
15.5
76.1
80.7
0.10
183
2.6
MW-05
Shallow
5.6
-
0.59
32.3
0.22
<50
-
2.1
-
0.77
-
199
-
6.1
-
-
-
0.083
-
35.0
0.58
MW-06
Shallow
5.7
62.8
0.68
<50
7.8
0.28
54.7
2.4
-
<0.1
54.7
0.35
MW-07
Shallow
5.5
-
-
34.1
0.30
1,309
6.2
-
0.77
111
9.8
-
13.4
-
89.9
-
173
0.40
MW-104BRA
Bedrock
7.9
0.27
1.4
22
<0.1
<50
<0.08
3.6
0.27
23.9
0.57
186
4.8
1 38.8
10.5
<0.5
291
9.5
<0.1
135
6.5
MW-104D
Transition Zone
6.9
<0.5
0.12
5.6
<0.1
<50
<0.08
1.2
0.89
1.8
0.057
167
5.2
8.2
2.9
<0.5
73.8
1.0
<0.1
1 109
4.2
MW-104S
Shallow
5.4
<0.5
<0.1
67.7
0.15
<50
<0.08
0.94
1.4
3.9
0.12
1 139
0.9
8.4
1.3
<0.5
1 28.4
<1
<0.1
42.3
0.32
MW-203BR
Bedrock
6.7
<0.5
0.12
<5
<0.1
<50
<0.08
9.8
0.74
1.8
0.05
89.7
11.7
6.1
2.3
<0.5
48.6
2.1
<0.1
117
2.7
MW-203D
Transition Zone
6.6
<0.5
0.11
8.7
<0.1
<50
<0.08
3.6
1.5
1.8
<0.1
89.4
9.6
6.8
1.4
<0.5
34.7
1.0
<0.1
94.8
3.4
MW-203S
Shallow
5.6
<0.5
1 <0.1
1 48.8
1 0.17
<50
1 <0.08
1.4
0.30
1.1
<0.1
<50
0.8
<5
<0.5
<0.5
19.7
<1
<0.1
35.4
<0.3
MW2-07
Transition Zone
5.2
-
0.33
19.7
2.35
1 13,600
0.59
1 10.1
1 -
0.22
0.44
18.8
-
298
-
120
-
681
-
1,123
0.46
MW2-09
Transition Zone
6.1
0.35
59.4
0.023
292
3.5
1.6
1.0
564
288
0.60
32.1
0.10
141
0.80
OB-05
Shallow
5.3
0.51
113
0.52
<50
3.8
1.3
0.32
687
34.7
-
0.079
0.12
<25
1.3
OB-09
Transition Zone
5.1
0.71
13.6
2.0
26,233
1.7
9.9
-
1.1
0.36
26.8
1,079
-
277
-
955
1 493
0.54
Rev. 1
Page 2 of 4
23 April 2020

TABLE 6-5
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO APRIL 2019
CORRECTIVE ACTIVE PLAN UPDATE
BELEWS CREEK STEAM STATION
DUKE ENERGY CAROLINAS, LLC, BELEWS CREEK, NC
Analytical Parameter
PH
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium (VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Thallium
Total Dissolved Solids
Vanadium
Reporting Units
S.U.
Ug/L
ug/L
pg/L
pg/L
ug/L
ug/L
mg/L
pg/L
ug/L
ug/L
ug/L
Ng/L
ug/L
ug/L
ug/L
ug/L
mg/L
pg/L
mg/L
ug/L
15A NCAC 02L Standard
6.5-8.5
1*
10
700
4*
700
2
250
10
10
1*
300
NE
50
NE
20
NE
250
0.2*
500
0.3*
2018 Background Threshold Values (Shallow Flow Zone)'
5.1-6.0
1
1
58
0.4
50
1
15
2
5
0.5
750
NE
23
1
0.5
57
2
0.2
85
1
2019 Background Threshold Values (Shallow Flow Zone)Z
5.2-6.0
1
1
123
0.3
50
1
19
4
11
0.6
1600
2
40
0.5
1
46
2
0.2
93
3
2019 Background Dataset Range Shallow Flow Zone)2
5.3-5.9
0.1-1.1
1 0.04-1
19-124
0.03-0.6
2.5-50
0.03-1.0
1.2-18.8
0.2-2.7
0.5-11.7
0.02-1.3
1 22-11,100
0.39-2
1 3-189
0.1-1.3
0.1-1.4
7.9-48
0.1-2.4
0.02-0.2
20-90
0.1-6.4
2018 Background Threshold Values (Deep Flow Zone)'
5.2-7.0
1
1
13
0.2
50
1
21
0.4
3
2
240
NE
13
1
0.5
69
6
0.2
148
1
2019 Background Threshold Values (Deep Flow Zone)Z
5.6-7.0
1
1
16
0.1
50
0.08
19
0.6
3
2
1 226
95
57
2
0.5
73
8
0.1
134
2
2019 Background Dataset Range (Deep Flow Zone)2
5.6-7.0
0.1-1.5
0.05-1.1
0.004-0.2
0.01-0.02
11.9-58.8
0.03-0.2
2.0-20.3
0.03-0.5
0.1-5.0
0.02-1.8
13-850
2.2-52.2
2.5-104
0.1-5.3
0.2-3.7
29.3-87.8
0.5-11
0.02-0.1
25-126
0.1-1.4
2018 Background Threshold Values (Bedrock Flow Zone)'
6.2-8.4
1
1
6
0.2
50
0.08
3
0.3
5
0.8
228
NE
10
4
0.5
100
10
0.1
133
1
2019 Background Threshold Values (Bedrock Flow Zone)Z
6.3-6.5
1
2
11
0.2
50
0.08
3
0.4
11
0.8
341
30
64
6
0.5
99
15
0.1
181
2
2019 Back round Threshold Values Bedrock Flow Zone Z
6.2-8.4
0.1-1.4
0.1-1.5
3.0-11
0.01-0.2
33.3-50
0.03-0.1
2.3-3.2
0.03-0.3
0.5-34.7
0.03-0.8
27-228
3.9-30
3.9-87.1
0.5-3.7
0.4-0.5
32.6-100
2.5-22.5
0.1-0.1
52-250
0.2-2.3
Sample ID
Flow Zone
Mean, Geomean, or Median Result;
Downgradient of the Ash
CCR-13BR
Bedrock
7.6
0.41
1.7
10
<0.1
<50
<0.08
22
0.21
2.5
0.18
107
30
31
9.4
<0.5
133
87
<0.1
300
1.
CCR-13D
Transition Zone
6.0
<0.5
0.72
13
0.13
<50
<0.08
14
<0.025
0.58
2.8
70
4.8
92
0.20
<0.5
52
13
0.077
73
<0.3
CCR-13S
Shallow
5.6
<0.5
0.12
14
0.23
<50
<0.08
13
0.074
<0.5
0.78
134
4.2
34
<0.5
<0.5
44
0.78
0.076
54
0.33
GWA-01BR
Bedrock
10.0
0.26
0.34
5.9
<0.1
<50
<0.08
2.4
<0.025
2.4
0.15
153
64
9.1
7.3
<0.5
75
6.4
<0.1
110
0.28
GWA-01D
Transition Zone
6.1
0.70
0.99
9.7
<0.1
<50
<0.08
89
0.040
4.8
9.0
198
36
40
6.4
<0.5
120
4.2
0.053
233
0.63
GWA-01S
Shallow
4.7
0.44
0.22
192
4.5
633
0.16
55
0.17
0.87
3.7
186
11
131
0.4
0.4
68
0.99
0.25
102
0.25
GWA-02D
Transition Zone
6.2
<0.5
3.3
<5
0.072
<50
1 <0.08
1.8
0.16
2.4
0.31
1 73.5
29
1 12
0.62
<0.5
24
0.82
1 <0.1
55
0.30
GWA-02S
Shallow
5.3
<0.5
0.69
17
0.21
<50
<0.08
1.5
0.078
0.63
0.33
553
4.7
16
<0.5
<0.5
3.2
<1
0.082
<25
0.29
GWA-10DA
Transition Zone
7.7
<0.5
2.4
10
<0.1
<50
<0.08
8.4
0.22
1.1
0.24
243
45
12
0.33
<0.5
90
9.0
<0.1
128
0.63
GWA-10S
Shallow
4.0
<0.5
5.5
583
0.91
327
0.45
116
0.026
1.2
14
153
5.0
2,753
<0.5
3.3
46
<1
0.24
200
0.32
GWA-11D
Transition Zone
6.0
<0.5
3.0
17
0.56
419
<0.08
251
<0.025
4.6
3.4
3,743
117
153
0.56
<0.5
538
4.2
<0.1
553
0.38
GWA-11S
Shallow
4.6
<0.5
1.9
547
11
1,338
0.81
203
0.032
2.4
10
377
33
162
<0.5
1.4
432
<1
0.38
415
0.44
GWA-16BR
Bedrock
9.6
0.91
1.7
8.1
<0.1
<50
<0.08
0.95
0.079
0.64
<0.1
50
17
<5
1.6
<0.5
1 136
14
<0.1
130
0.54
GWA-16DA
Transition Zone
6.5
<0.5
0.11
5.7
<0.1
1 <50
<0.08
0.99
0.051
0.80
0.92
1 1,972
4.3
1 19
0.63
<0.5
42
8.5
<0.1
<250
<0.3
GWA-16S
Shallow
5.0
<0.5
<0.1
38
0.10
<50
<0.08
0.78
0.25
0.58
1.2
65
2.0
50
<0.5
<0.5
7.1
<1
<0.1
34
<0.3
GWA-17D
Transition Zone
6.9
<0.5
0.11
8.1
<0.1
51
<0.08
1.1
<0.025
1.3
0.31
2,090
1.0
43
0.47
<0.5
41
12
<0.1
100
0.34
GWA-17S
Shallow
5.3
<0.5
0.12
52
<0.1
55
0.079
1.1
0.037
0.66
11
237
2.4
167
<0.5
<0.5
10
19
<0.1
52
0.33
GWA-18D
Transition Zone
6.4
1 <0.5
0.56
<5
<0.1
<50
<0.08
21
1 1.4
1.7
0.12
<50
12
30
0.86
<0.5
62
6.4
<0.1
<250
0.49
GWA-18SA
Shallow
4.4
<0.5
2.6
644
5.9
693
0.94
145
0.026
1.1
89
188
36
1,937
<0.5
1.3
138
<1
1.2
<250
<0.3
GWA-19BR
Bedrock
10.4
0.77
0.32
1 7.9
<0.1
<50
1 <0.08
1.3
0.10
1.1
<0.1
53
57
<5
2.3
1 <0.5
51
14
<0.1
136
0.19
GWA-19D
Transition Zone
7.2
<0.5
15
6.3
<0.1
<50
<0.08
3.6
0.043
<0.5
0.33
1 2,449
60
87
1.2
<0.5
80
13
<0.1
<250
0.20
GWA-19SA
Shallow
4.7
<0.5
6.1
686
9.5
2,225
0.82
191
0.030
1.2
48
137
20
2,033
<0.5
5.9
153
<1
0.48
331
<0.3
GWA-20BR
Bedrock
9.6
0.67
30
<5
<0.1
63
<0.08
27
0.047
1.7
<0.1
92
93
6.6
50
<0.5
55
15
<0.1
<250
0.43
GWA-20D
Transition Zone
5.2
<0.5
4.1
42
1.5
9,690
1.9
425
0.030
1.1
2.9
54
63
1,987
<0.5
<0.5
863
68
0.2
885
<0.3
GWA-20SA
Shallow
5.1
<0.5
3.0
198
5.8
11,176
1.1
415
1 0.050
0.92
17
148
18
5,000
<0.5
0.70
494
87
0.44
919
<0.3
GWA-21D
Transition Zone
5.1
0.5
1 0.23
220
5.0
507
0.96
238
0.03
0.68
0.9
47
17
48
0.5
0.45
643
1
0.29
468
0.23
GWA-21S
Shallow
4.7
<0.5
1.8
400
1 9.9
364
1 0.7
137
0.036
1.1
20
101
15
208
<0.5
1.3
194
1.9
0.27
247
<0.3
GWA-24BR
Bedrock
7.7
<0.5
2.3
<5
<0.1
<50
<0.08
2.0
0.034
2.1
0.17
227
29
15
3.7
<0.5
108
5.3
<0.1
144
0.35
GWA-24D
Transition Zone
5.4
0.58
<0.1
9.5
0.16
<50
0.089
56
0.16
4.0
0.22
105
1.8
13
0.59
<0.5
110
1.6
<0.1
157
<0.3
GWA-24S
Shallow
5.8
-
-
-
-
<50
-
-
-
-
-
-
-
-
-
-
-
1.1
-
105
-
GWA-27BR
Bedrock
11.5
-
-
-
-
<50
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
GWA-27D
Transition Zone
5.1
<0.5
2.5
91
3.2
7,663
1.9
1 431
0.079
0.72
9.6
<50
58
2,810
0.4
0.42
833
23
0.37
834
<0.3
GWA-27S
Shallow
4.6
<0.5
2.4
111
1.6
533
0.25
47
0.035
1.3
1 41
228
13
884
<0.5
1.3
38
4.1
0.25
154
<0.3
GWA-30D
Transition Zone
7.4
<0.5
1.3
31
<0.1
<50
<0.08
4.3
0.14
<0.5
0.087
<50
25
70
3.2
<0.5
70
1 1.0
<0.1
116
0.58
GWA-30S
Shallow
5.1
<0.5
0.34
18
0.54
<50
<0.08
5.2
0.042
<0.5
1.4
58
7.9
1 19
<0.5
<0.5
35
<1
<0.1
46
<0.3
GWA-31D
Transition Zone
7.4
<0.5
0.28
4.2
0.16
<50
<0.08
2.3
<0.025
0.73
<0.1
819
26.2
33
0.34
<0.5
54
5.5
<0.1
104
<0.3
GWA-31S
Shallow
5.5
<0.5
0.23
17
0.37
<50
<0.08
2.7
0.057
1.1
0.19
304
2.3
9.7
<0.5
<0.5
13
<1
<0.1
31
0.40
GWA-32D
Transition Zone
8.0
0.56
0.49
9.7
<0.1
42
<0.08
71
0.073
0.80
0.050
1,004
64
213
1 1.4
<0.5
145
48
1 <0.1
356
<0.3
GWA-32S
Shallow
6.3
<0.5
1 53
27
0.24
1 87
<0.08
1 50
0.034
1.2
58
34,820
1
9,180
0.67
<0.5
6.4
<1
0.70
128
<0.3
MW-200BR
Bedrock
7.3
<0.5
1.3
<5
0.21
156
<0.08
62
<0.025
<0.5
0.08
1 237
42
132
0.43
<0.5
191
6.5
<0.1
273
<0.3
MW-200D
Transition Zone
6.1
<0.5
0.79
<5
0.077
159
<0.08
39
0.10
0.54
0.064
56
13
13
0.29
<0.5
1 113
3.2
<0.1
156
<0.3
MW-200S
Shallow
5.6
<0.5
1.6
48
0.32
62
<0.08
26
0.063
1.3
4.0
953
1.7
123
<0.5
<0.5
L 55
6.4
<0.1
107
0.67
MW-201BR
Bedrock
7.6
0.54
0.46
<5
<0.1
<50
<0.08
5.0
0.080
0.85
0.054
63
14
44
11
<0.5
40
8.1
<0.1
127
0.32
MW-201D
Transition Zone
6.1
<0.5
0.064
<5
<0.1
<50
<0.08
4.9
3.1
4.0
0.043
64
4.5
6.4
0.47
<0.5
62
1.1
<0.1
99
1.3
MW-204D
Transition Zone
5.6
<0.5
<0.1
45
<0.1
<50
<0.08
1.9
0.098
<0.5
26
104
1.8
38
<0.5
<0.5
15
4.9
0.068
<250
0.39
MW-204S
Shallow
5.6
<0.5
0.17
253
0.069
<50
0.15
2.9
<O.025
0.68
14
4,621
2.6
503
<0.5
<0.5
21
1 2.4
1 0.12
1 <250
0.43
Rev. 1
Page 3of4
23 April 2020

TABLE 6-5
MEANS OF GROUNDWATER COIs - JANUARY 2018 TO APRIL 2019
CORRECTIVE ACTIVE PLAN UPDATE
BELEWS CREEK STEAM STATION
DUKE ENERGY CAROLINAS, LLC, BELEWS CREEK, NC
Analytical Parameter
pH
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Chloride
Chromium (VI)
Chromium
Cobalt
Iron
Lithium
Manganese
Molybdenum
Selenium
Strontium
Sulfate
Thallium
Total Dissolved Solids
Vanadium
Reporting Units
S.U.
Ug/L
pg/L
pg/L
Ug/L
pg/L
pg/L
mg/L
Ug/L
pg/L
pg/L
pg/L
pg/L
ug/L
pg/L
ug/L
pg/L
mg/L
Ug/L
mg/L
pg/L
15A NCAC 02L Standard
6.5-8.5
1*
SO
700
4*
700
2
250
10
SO
1*
300
NE
50
NE
20
NE
250
0.2*
500
0.3*
2018 Background Threshold Values (Shallow Flow Zone)'
5.1-6.0
1
1
58
0.4
50
1
15
2
5
0.5
750
NE
23
1
0.5
57
2
0.2
85
1
2019 Background Threshold Values (Shallow Flow Zone)Z
5.2-6.0
1
1
123
0.3
50
1
19
4
11
0.6
1600
2
40
0.5
1
46
2
0.2
93
3
2019 Background Dataset Range Shallow Flow Zone)2
5.3-5.9
0.1-1.1
1 0.04-1
19-124
0.03-0.6
2.5-50
0.03-1.0
1.2-18.8
0.2-2.7
0.5-11.7
0.02-1.3
1 22-11,100
0.39-2
1 3-189
0.1-1.3
0.1-1.4
7.9-48
0.1-2.4
0.02-0.2
20-90
0.1-6.4
2018 Background Threshold Values (Deep Flow Zone)'
5.2-7.0
1
1
13
0.2
50
1
21
0.4
3
2
240
NE
13
1
0.5
69
6
0.2
148
1
2019 Background Threshold Values (Deep Flow Zone)Z
5.6-7.0
1
1
16
0.1
50
0.08
19
0.6
3
2
1 226
95
57
2
0.5
73
8
0.1
134
2
2019 Background Dataset Range (Deep Flow Zone)2
5.6-7.0
0.1-1.5
0.05-1.1
0.004-0.2
0.01-0.02
11.9-58.8
0.03-0.2
2.0-20.3
0.03-0.5
0.1-5.0
0.02-1.8
13-850
2.2-52.2
2.5-104
0.1-5.3
0.2-3.7
29.3-87.8
0.5-11
0.02-0.1
25-126
0.1-1.4
2018 Background Threshold Values (Bedrock Flow Zone)'
6.2-8.4
1
1
6
0.2
50
0.08
3
0.3
5
0.8
228
NE
10
4
0.5
100
10
0.1
133
1
2019 Background Threshold Values (Bedrock Flow Zone)Z
6.3-6.5
1
2
11
0.2
50
0.08
3
0.4
11
0.8
341
30
64
6
0.5
99
15
0.1
181
2
2019 Back round Threshold Values Bedrock Flow Zone Z
6.2-8.4
0.1-1.4
0.1-1.5
3.0-11
0.01-0.2
33.3-50
0.03-0.1
2.3-3.2
0.03-0.3
0.5-34.7
0.03-0.8
27-228
3.9-30
3.9-87.1
0.5-3.7
0.4-0.5
32.6-100
2.5-22.5
0.1-0.1
52-250
0.2-2.3
Sample ID Flow Zone
Mean, Geomean, or Median Result;
IMP Extraction System
EX-01
Transition Zone
5.3
1.1
2.8
102
4.3
9,877
1.6
412
0.071
1.9
10
121
38
3,940
0.30
<0.5
853
69
0.37
893
<0.3
EX-02
Transition Zone
5.0
<0.5
3.0
146
7.1
10,157
1.5
538
0.18
4.5
17
<50
24
3,843
0.30
0.71
592
116
0.37
922
<0.3
EX-03
Transition Zone
5.2
<0.5
3.2
210
2.7
9,663
0.48
540
0.078
0.55
43
28
12
4,523
0.22
1.3
507
112
0.63
958
<0.3
EX-04
Transition Zone
5.2
<0.5
2.5
259
1.9
9,897
0.47
461
0.13
0.69
81
26
13
6,073
0.22
1.3
475
76
0.60
998
<0.3
EX-05
Transition Zone
5.3
<0.5
3.0
229
0.86
10,083
0.37
450
0.069
0.82
100
36
10
5,060
0.14
1.9
492
118
0.74
980
<0.3
EX-06
Transition Zone
5.5
<0.5
1.1
278
1.2
9,983
0.84
463
0.078
0.97
124
<50
16
7,313
<0.5
0.73
709
74
0.86
984
<0.3
EX-07
Transition Zone
5.3
<0.5
1.7
192
1.5
6,140
0.86
329
0.069
1.0
57
86
32
3,510
0.12
0.36
711
24
0.59
705
<0.3
EX-08
Transition Zone
5.2
<0.5
0.63
371
1.8
2,790
0.80
235
0.100
<0.5
9.7
<50
24
1,570
<0.5
<0.5
534
1.9
0.76
464
<0.3
EX-09
Transition Zone
5.1
-
0.97
471
2.4
2,600
1.1
285
0.073
-
7.0
153
43
1,365
-
-
795
0.97
0.56
595
<0.3
EX-10
Transition Zone
5.6
<0.5
1.0
7.5
1.3
3,970
0.38
264
0.038
4.3
7.3
31
125
1,450
0.29
<0.5
553
3.3
1 0.095
569
<0.3
Prepared by: ALA/LWD Checked by: DAA/MCR
Notes: Revised by: DAA 3/2/2020 Checked by: ALA 3/2/2020
' - Background threshold values were calculated using data from background groundwater samples collected June 2015 to April 2017
2 - Background threshold values were calculated using data from background groundwater samples collected October 2010 to December 2018 and sumbmitted to NCDEQ June 2019
3 - Statistical mean, geomean, or median calculated from data ranging from January 2018 to April 2019. Ash pore water results are not compared to groundwater standards or criteria.
4 - Background groundwater results are not compared to compartive criteria. Background concentrations greater than background threshold values are within background dataset ranges or piedmont setting background ranges. Groundwater Flow directions across the Site indicate all approved background locations are representative of naturally occuring conditions.
Mean or geomean results were used based on the central tendency of the data set. Median results were used for total radium only.
For wells with datasets containing fewer than four valid results, the most recent valid sample data was used.
Means were calculated for wells with four or more valid sample results. Sample results were excluded from calculations:
1) if turbidity >10 NTU (for COIs other than boron)
2) for unusable data (RO qualified)
3) if a result was non -detect at a reporting limit (RL) greater than the normal laboratory RL
Bold text - greatest comparative value
bold highlighted concentration indicates value is greater than applicable regulatory standarad (02L or IMAC)
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 within range of background threshold values for constituents where there is no regulatory standard, or background threshold values are greater than 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
S.U. Standard unit
Rev. 1
Page aof4
23 April 2020

TABLE 6-6
COI MANAGEMENT
MATRIX
CORRECTIVE ACTION PLAN
UPDATE
BELEWS CREEK STEAM
STATION
DUKE ENERGY CAROLINA, LLC,
BELEWS CREEK, NC
Lines of Evidence (LOE) - 02L Criterion
Constituent Standards and Values - 02L Criterion
Rationale - 02L Criterion
Single location with mean greater than 02L at or beyond the compliance boundary. Does not exhibit a discernable plume and is not
Shallow
1
1
52.5
5.25
1
GWA-32S
9
9
1
y
within the 02L boron plume footprint. Location is adjacent to a wetland; reducing conditions may enhance constituent solubility. No
means of constituent greater than 02L in deep flow zone at this location.
Transition Zone
1
1
14.6
1.46
1
GWA-19D
7
6
1
y
Single location with mean greater than background value at or beyond the compliance boundary. Does not exhibit a discernable
plume but is within the 02L boron plume footprint.
Arsenic
µg/L
10
0.04-1.5
0.04 - 1.5
0.1 - 6.35
y
Non -Conservative
Single location with mean greater than background value at or beyond the compliance boundary. Does not exhibit a discernable
Bedrock
1
2
30.4
3.04
1
GWA-20BR*
3
3
1
y
plume but is within the 02L boron plume. Bedrock location exhibits slightly alkaline pH conditions which may enhance constituent
solubility.
Shallow
58
123
686
0.98
0
6
6
0
N
No means greater than 02L at or beyond the compliance boundary. Does not warrant corrective action.
Transition Zone
13
16
221
0.32
0
15
0
0
N
No means greater than 02L at or beyond the compliance boundary. Does not warrant corrective action.
Barium
µg/L
700
0.004-124
0.004 - 124
11 - 840
N
Non -Conservative
Bedrock
6
11
10
0.01
0
0
0
0
N
No means greater than 02L at or beyond the compliance boundary. Does not warrant corrective action.
Shallow Zone
50
50
11176
15.97
4
GWS-1S, GWA-11S, GWA-19SA, GWA-20SA
9
9
7
y
Mulitple locations with means greater than 02L at or beyond the compliance boundary and which exhibit a discernable plume.
Transition Zone
50
50
9690
13.64
2
GWA-20D, GWA-27D
4
4
3
y
Mulitple locations with means greater than 02L at or beyond the compliance boundary and which exhibit a discernable plume.
Boron
µg/L
700
2.5-58.8
2.5 - 58.8
49.09 - 176.8
y
Conservative
Bedrock Zone
50
50
156
0.22
0
2
2
0
N
No means greater than 02L at or beyond the compliance boundary, however, flow and transport modeling predicts 02L plume
migration at or beyond the compliance boundary.
Shallow Zone
1
1
1.1
0.55
0
1
1
1
N
No means greater than 02L at or beyond the compliance boundary. Does not warrant corrective action.
Transition Zone
1
0.08
1.9
0.96
0
2
2
2
N
No means greater than 02L at or beyond the compliance boundary. Does not warrant corrective action.
Cadmium
µg/L
2
0.03-1.0
0.03 - 1.0
0.08- 1
N
Non -Conservative
Bedrock Zone
0.8
0.08
<0.08
NA
0
0
0
0
N
No means greater than 02L at or beyond the compliance boundary. Does not warrant corrective action.
Shallow Zone
is
19
415
1.66
1
GWA-20SA
9
9
1
y
Single location with mean greater than background value at or beyond the compliance boundary. Does not exhibit a discernable
plume but is within the 02L boron plume footprint.
Transition Zone
21
19
431
1.72
3
GWA-IID, GWA-20D, GWA-27D
8
8
3
y
Mulitple locations with means greater than 02L at or beyond the compliance boundary and which exhibit a discernable plume.
Chloride
mg/L
250
1.2-20.3
1.2 - 20.3
3- 250
y
Conservative
Bedrock Zone
3
3
62
0.25
a
4
3
0
N
No means greater than 02L at or beyond the compliance boundary, however, flow and transport modeling predicts 02L plume
migration at or beyond the compliance boundary.
Shallow Zone
5
11
2.4
0.22
0
0
0
0
N
No means greater than background value at or beyond the compliance boundary. Does not warrant corrective action.
Transition Zone
3
3
4.8
0.48
0
0
0
0
N
Non -Conservative
Chromium (Total)
µg/L
30
0.1-34.7
0.1 - 34.7
1 - 26
No means greater than 02L at or beyond the compliance boundary. Does not warrant corrective action.
Bedrock Zone
5
11
2.5
0.22
0
0
0
0
N
No means greater than background value at or beyond the compliance boundary. Does not warrant corrective action.
Shallow Zone
2
4
0.17
0.02
0
5
5
0
No means greater than background value at or beyond the compliance boundary. Does not warrant corrective action.
Transition Zone
0.4
0.6
3.1
0.31
0
2
2
0
Variable
No means greater than background value at or beyond the compliance boundary. Does not warrant corrective action.
Chromium (Hexaval mt)
µg/L
10
0.03-2.7
0.03 - 2.7
0.03 - 12
Betlrock Zone
0.3
0.4
0.21
0.02
0
2
0
o
N
No means greater than background value at or beyond the compliance boundary. Does not warrant corrective action.
Single location with mean greater than background value at or beyond the compliance boundary. Does not exhibit a discernable
Shallow Zone
750
1600
34820
21.76
1
GWA-325
1
1
0
V
plume and is not within the 02L boron plume footprint. Location is adjacent to a wetland; reducing conditions may enhance
constituent solubility.
300
Iron
µg/L
(Deep Flow
Transition Zone
24
226
13-11,100
13 - 11,100
56.3 - 37,500
3743
12.48
4
GWA-11D, GWA-19D, GWA-31D, GWA-32D
y
3
0
0
y
Variable
Mulitple locations with means greater than 02L at or beyond the compliance boundary and which exhibit a discernable plume.
Zone only)
Bedrock Zone
228
341
237
0.70
0
1
0
0
N
No means greater than background value at or beyond the compliance boundary. Does not warrant corrective action.
Shallow Zone
23
40
9180
183.60
12
GWA-01S, GWA-10S, GWA-IIS, GWA-16S, GWAI7S, GWA-19SA,
GWA-20SA, GWA-215, GWA-27S, GWA-325, MW-200S, MW-2045
7
7
1
y
Mulit ple locations with means greater than 02L at or beyond the compliance boundary and which exhibit a discernable plume.
Manganese
µg/L
S0
(Shallow Flow
Zone only)
2.5-189
2.5 - 189
7 - 9,170
y
Variable
Transition Zone
13
57
2810
49.30
]
CCR-13D, GWA-11D, GWA-19D, GWA-20D, GWA-27D,
GWA-30D, GWA-32D
4
3
0
V
Mulit le locations with means
P greater than background value at or beyond the Compliance boundary and which exhibit a discernable
plume.
Bedrock Zone
10
64
132
2,16
1
MW-200BR
1
0
D
y
Single location with mean greater than background value at or beyond the compliance boundary. Does not exhibit a discernable
plume but is within the predicted 02L boron plume footprint.
Rev. 1
23 April 2020

TABLE 6-6
COI MANAGEMENT MATRIX
CORRECTIVE ACTION PLAN UPDATE
BELEWS CREEK STEAM STATION
DUKE ENERGY CAROLINA, LLC, BELEWS CREEK, NC
Gr ... dw.t.r B Maximum Number of Wells F`6 d" Rationale for Selection of COIs for Corrective Action Evaluation
Mean G
,K c' Steam Station s Station Background C=ter Than
Constituents of Interest Reporting 02L or IMAC Bn'kt.u.d Th-hold �O . 01 'e,
..Hvedo Concentration p, Id, I& (constituents where no means are greater than comparative criteria
low Zone E,,e,d,nce Groundwater Monitoring Well, With COX Concentration Greater . I " 0� 10 .101
hmtive
(2017 CSA Upd,t,) unit Criterion alue" Backgro Background Value Range at or pleyond R,tio4 Cril Co At Th.. Comparative Criteria '.G o in all flow zones and/or multiple lines of evidence support that constituent occurrences
Rumi D t-et nge C.m iance Beyond - Hance am not related to the source area, no corrective action is warranted)
et -et ng Boundary Bou=py'
Shallow zone 0.5 1 5.9 0.30 0 3 1 2 N No means greater than 02L at or beyond the compliance boundary. Does not warrant corrective action.
Selenium µg/L 20 Transition Zone 0.1 0.5 0.1-3.] 0.1 - 3.] ..5- 2 0.42 0.02 o N 0 0 0 N variable No means greater than 02L at or beyond the compliance boundary. Does not warrant corrective action.
Bedrock Zone 1 0.5 1 0.5 1 1 1 1 0.5 NA I 0 1 0 0 0 N No means greater than 02L at or beyond the compliance boundary. Does not warrant corrective action.
Shallow Zone
2
2
87
0.35
0
3
1 0
N
No means greater than 02L at or beyond the compliance boundary. Does not warrant corrective action.
No means greater than 02L at or beyond the compliance boundary. Does not warrant corrective action.
Sulfate
mg/L
250
Transition Zone
6
8
0.1-22.5
0.1- 22.5
1.2 - 510
68
0.27
0
y
5
3 0
N
Variable
No means greater than 02L at or beyond the compliance boundary. Does not warrant corrective action.
Bedrock Zone
10
15
67
0.35
0
1
1 0
N
Shallow Zone
85
93
919
1.84
1
GWA-20SA
10
3 0
y
Single location with mean greater than background value at or beyond the compliance boundary. Does not exhibit a discernable
plume but is within the 02L boron plume footprint.
Mulitple locations with means greater than 02L at or beyond the compliance boundary and which exhibit a discernable plume.
Total Dissolved Solids
mg/L
500
Transition Zone
148
134
20-250
20 - 250
50 - 1,200
885
1.77
3
GWA-11D, GWA-20D, GWA-27D y
10
4 0
y
Conservative
Bedrock Zone
133
181
300
0.60
0
2
2 0
N
No means greater than 02L at or beyond the compliance boundary, however, Flow and transport modeling predicts 02L plume
migration at or beyond the compliance boundary.
Constituent Standards and Values - IMAC Criterion Lines of Evidence (LOE) - IMAC Criterion
Rationale - IMAC Criterion
Shallow zone
1
1
<0.5
NA
0
0
0
0
N
No means greater than IMAC value at or beyond the compliance boundary. Does not warrant corrective action.
No means greater than IMAC value at or beyond the compliance boundary. Does not warrant corrective action.
Antimony
µg/L
1
Transition Zone
1
1
0.1-1.5
0.1- 1.5
0.5 - 4.247
0.70
0.70
0
v
t
o
0
N
Conservative
No means greater than IMAC value at or beyond the compliance boundary. Does not warrant corrective action.
Mulitple locations with means greater IMAC value at or beyond the compliance boundary and which exhibit a discernable plume.
Bedrock Zone
1
1
0.77
0.77
0
1
0
0
N
Shallow Zone
0.4
0.3
11
2.74
5
GWA-01S, GWA-IIS, GWA-19SA, GWA-20SA, GWA-21S
0
0
0
y
Beryllium
µg/L
4
Transition Zone
0.2
0.1
0.01-0.6
0.01 - 0.6
0.053 - 1
5.0
1.24
1
GWA-21D N
0
0
0
v
Non C.nva-nive
Single location with mean greater than background value at or beyond the compliance boundary. Does not exhibit a discernable
plume but is within the 02L boron plume footprint.
No means greater than IMAC value at or beyond the compliance boundary. Does not warrant corrective action.
Betlrock Zone
0.2
0.2
0.21
0.05
0
0
0
0
N
Shallow Zone
0.5
0.6
58
58.00
13
GWA-01S, GWA-10S, GWA-IIS, GWA-16S, GWA-17S, GWA-19SA,
GWA-20SA,GWA-21S,GWA-27S, GWA-30S, GWA-32S, MW-200S,
MW-204S
18
6
0
v
Mulitple locations with means greater than IMAC value at or beyond the compliance boundary and which exhibit a discernable
plume.
Mulitple locations with means greater than background value at or beyond the compliance boundary and which exhibit a discernable
plume.
Cobalt
µg/L
1
Transition Zone
2
2
0.02-1.8
0.02 - 1.8
0.2- 88.85
25
12.30
6
CCR-13D, GWA-01D, GWA-IID, GWA-20D, GWA-27D, MW-204D y
5
0
0
y
,i,. „
No means greater than IMAC value at or beyond the compliance boundary. Does not warrant corrective action.
Bedrock zone
0.8
1 0.8
0.18
0.18
0
0
0
0
N
Shallow Zone
0.2
0.2
0.70
3.48
8
GWA-01S, GWA-10S, GWA-11S, GWA-19SA, GWA-20SA,
GWA-21S, GWA-27S, GWA-32S
0
0
0
y
Mulitple locations with means greater than IMAC value at or beyond the compliance boundary and which exhibit a discernable
plume.
Mulitple locations with means greater than IMAC value at or beyond the compliance boundary and which exhibit a discernable
plume.
Thallium
µg/L
0.2
Transition Zone
0.2
0.1
0.02-0.2
0.02 - 0.1
0.1-0.2
0.37
1.87
2
GWA-21D, GWA-27D y
0
0
0
v
Vari;:,
No means greater than IMAC value at or beyond the compliance boundary. Does not warrant corrective action.
Betlrock Zone
0.1
0.1
<0.1
NA
0
0
0
0
N
Shallow zone
1
3
0.67
0.22
0
0
0
0
N
No means greater than background value at or beyond the compliance boundary. Does not warrant corrective action.
No means greater than background value at or beyond the compliance boundary. Does not warrant corrective action.
vanadium
ug/L
0.3
Transition Zone
1
2
0.1-6.4
0.1 - 6.4
0.38 - 26
1.3
0.63
0
y
0
0
0
N
Non -Conservative
No means greater than background value at or beyond the compliance boundary. Does not warrant corrective action.
Bedrock zone
1
2
1.5
1,71
0
0
0
o
N
Rev. 1
23 April 2020

TABLE 6-6
COI MANAGEMENT MATRIX
CORRECTIVE ACTION PLAN UPDATE
BELEWS CREEK STEAM STATION
Gr ...
..Hvedo ,K
dw.t.r
c' v
B
Steam Station
low Zone
Maximum
Concentration
s Station Background
Mean
E,,e,d,nce
Number of Well.
G
C=ter Than
p,
DUKE ENERGY CAROLINA, LLC, BELEWS CREEK, NC
Groundwater Monitoring Well, With COX Concentration Greater
10
.41
.
Id, I&
I "
Rationale for Selection of COIs for Corrective Action Evaluation
8, 10 .101 (constituents where no means are greater than comparative criteria
(2017 CSA Upd,t,)
unit
Criterion alue" Backgro Background Value Range at or
Rumi . D t.set nge C.m
Flow Zone 20�
Constituent Standards and Values - Background Criterion
pleyond
iance
R,tio4
hmtive
Cril Co At
Beyond - Hance
Th.. Comparative Criteria
Lines of Evidence (LOE) - Background
Criterion
'.G a in all flow zones and/or multiple lines of evidence support that constituent occurrences
am not related to the source area, no connective action is warranted)
Rationale - Background Criterion
CCR-9W, GN/A-IS, GWA-IOW, GWA- S, GWA-16W, GWA-
Mulitple locations with means greater than background value at or beyond the compliance boundary and which exhibit a discernable
Shallow Zone
NE
2
33
16.71
14
125, GWA-195A,
-195A, GWA-205A, GWA-215, 6WA-225, GWA-305, 6WA-
11
0
0
Y
plume.
31W, MW-2045
Transition Zone
NE
95
117
1.23
1
GWA-11D
Single location with mean greater than background value at or beyond the compliance boundary. Does not exhibit a discernable
Lithium
pg/L
NE
2 - 95
2 -95
2- 95.39
1
1
0
V
Conservative
plume but is within the 02L boron plume footprint.
Mulitple locations with means greater than background value at or beyond the compliance boundary and which exhibit a discemable
Bedrock Zone
NE
30
93
3.09
5
CCR-13BR, GWA-01BR*, GWA-19BR-, GWA-20BR*, MW-200BR
5
0
0
y
plume. Several bedrock locations exhibit slightly alkaline pH conditions which may enhance constituent solubility. Remaining bedrock
wells are within the 02L boron plume footprint.
Shallow Zone
1
0.5
0.67
0.62
1
GWA-32S
1
0
0
V
Single location with mean greater than background value at or beyond the compliance boundary. Does not exhibit a discernable
plume and is not within the 02L boron plume footprint.
Transition Zone
1
2
6.4
3.21
2
GWA-01D, GWA-30D
Isolated locations with means greater than background value at or beyond the compliance boundary. Do not exhibit a discernable
Molybdenum
pg/L
NE
0.1-5.3
0.1 - 5.3
0.5 - 26
0
0
0
y
y."
plume and are not within the 02L boron plume footprint.
Isolated locations with means greater than background value at or beyond the compliance boundary. Do not exhibit a discernable
Bedrock Zone
4
6
50
8.32
4
CCR-13BR, GWA-01BR*, GWA-20BR*, MW-201BR
2
0
o
r
plume and are not within the 02L boron plume footprint. Several bedrock locations exhibit slightly alkaline pH conditions which may
enhance constituent solubility.
Shallow Zone
52
46
494
8.62
2
GWA-01W, GWA-10S, GWA-11S, GWA-195A, GWA-20SA,
2
2
1
y
Mulitple locations with means greater than background value at or beyond the compliance boundary and which exhibit a discernable
GWA-21S, MW-2005
plume.
Transition Zone
69
73
863
11.82
10
GWA-01D, GWA-10DA, GWA-11D, GWA-19D, GWA-20D, GWA-21D,
Mulitple locations with means greater than background value at or beyond the compliance boundary and which exhibit a discernable
Strontium
µg/L
NE
7.9-100
2.9 - 100
2] - 2222
12
9
1
V
Non -Conservative
GWA-24D, GWA-22D, GWA-32D, MW-200D
plume.
Bedrock Zone
110
99
191
1.93
4
CCR-13BR, GWA-168R, GWA-24BR, MW-200BR
10
4
0
y
Mulitple locations with means greater than background value at Or beyond the compliance boundary and which exhbit ia discernable
plume.
Prepared by: DM Checked by: AlA
Revised by: DAA (02/28/2020) Checked by: ALA (02/28/2020)
F-1 - ae b n. cr er n
F-1 - ev ence supports Inclusmn
- Ev ence suppoda exclusmn
ns rtuenl 11. re In. I l en ie in c e2017 csA update (synTera, 2012), wtth me add- V lithium.
June 2015
co April
were a mun rezodvauez cabal usm eta om ack9-d groundw-samples mlleccetl
ace ark9-dth-h.ld values are iI,Ih.1-column and were calculated using d- from backgroubd groundwater samples ro11l ORober 20100 December 2018and zumbmned [o NCDEQ 3une 20190
rt mecic mean M magni than was use r Wconcentration range less than or equal [o one order G of magnicutle. eo b, mean Mr was usetl WEwttM1 concenhabon range greater one order tude.
5 Assignment of mnservabvero1- non -conservative, or variable beM1 - Iz based on geocM1emical motleling rezutts.
- greater 1M1an
< less Ma
tz wx zllghtly alkline pH (a10 S.N.)
e
ulsetlIn Nei elvaluabon, In-Ing: CM-131N,
water quaey. slightly alkaline candid- appear Iomlhea and
CCR-131, 001135, GwA-111, GwA-115, GwA-161N, GwA-1611,
unc M1araRerkbc bedrock I.
M bflow zone
GwA-16s, GwA- 71, GwA-11G,
and might be attributable M well Inrtallatbn aRNibes.
GwA- 1, GwA-191, GwA-19GA, GwA-1BR, GwA-1D, Gw
s' G
pg/L-mlce-iogram�rlbwable cencentratbn
mv, - mllllgrams per Itter
knbk
NE -No Establtshetl
.. tend-untts
Rev. 1
23 April 2020 Page 3 of