_Allen CBE - Appendix D_20200107

APPENDIX D
CLOSURE PLAN DRAWINGS

ALN C999.001.011
ay. A
INCHES
DUKE ENERGY
ALLEN STEAM STATION
COAL COMBUSTION RESIDUALS SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS
CLOSURE BY EXCAVATION
RETIRED ASH BASIN (RAB) AND ACTIVE ASH BASIN (AAB)
GASTON COUNTY, NORTH CAROLINA
RAB DAM STATE ID: GASTO-016, AAB DAM STATE ID: GASTO-061, NPDES PERMIT #: NC0004979, RETIRED ASH BASIN LANDFILL PERMIT #: 36-12
IDEC"'EMBER 12. 2019
`, 1l
41 qr
V
�C
RAB j
0
CATAWBA RIVER/ �l
j� uv �?•.. _ LAKE WYLIE
AAB
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SITE LOCATION MAP_
0 2000 4000 6000
GRAPHIC SCALE (IN FEET)
TENTHS 10
N PLANT ALLEN ROAD
BELMONT, NORTH CAROLINA 28012
0
DRAWING NO. DRAWING DESCRIPTION
ALN_C999.001.011
COVER SHEET
ALN_C999.001.012
GENERAL NOTES
ALN_C999.001.013
EXISTING CONDITIONS PLAN WITH AERIAL
ALN_C999.001.014
EXISTING CONDITIONS PLAN WITH TOPOGRAPHIC MAP
ALN_C999.001.015
EXISTING CONDITIONS PLAN RETIRED ASH BASIN
ALN
C999.001.016
EXISTING CONDITIONS PLAN - ACTIVE ASH BASIN
ALN
C999.001.017
SUBSURFACE EXPLORATION LOCATION PLAN - RETIRED ASH BASIN
ALN_C999.001.018
SUBSURFACE EXPLORATION LOCATION PLAN - ACTIVE ASH BASIN
ALN_C999.001.019
ESTIMATED BOTTOM OF ASH CONTOUR MAP
ALN
_C999.001.020
-
ESTIMATED BOTTOM OF ASH CONTOUR MAP RETIRED ASH BASIN
ALN_C999.001.021
ESTIMATED BOTTOM OF ASH CONTOUR MAP - ACTIVE ASH BASIN
ALN_C999.001.022
DEMOLITION PLAN - RETIRED ASH BASIN
ALN_C999.001.023
DEMOLITION PLAN - ACTIVE ASH BASIN
ALN
C999.001.024
FINAL CLOSURE GRADING PLAN
ALN
C999.001.025
FINAL CLOSURE GRADING PLAN - RETIRED ASH BASIN
ALN_C999.001.026
FINAL CLOSURE GRADING PLAN - ACTIVE ASH BASIN
ALN_C999.001.027
FINAL SURFACE WATER MANAGEMENT PLAN
ALN_C999.001.028
FINAL CLOSURE GRADING CROSS SECTION LAYOUT PLAN
ALN_C999.001.029
FINAL CLOSURE GRADING CROSS SECTIONS I
ALN_C999.001.030
FINAL CLOSURE GRADING CROSS SECTIONS II
ALN_C999.001.031
FINAL CLOSURE GRADING CROSS SECTIONS III
ALN
C999.001.032
FINAL CLOSURE GRADING CROSS SECTIONS IV
ALN
C999.001.033
FINAL CLOSURE GRADING CROSS SECTIONS V
ALN_C999.001.034
FINAL CLOSURE GRADING CROSS SECTIONS VI
ALN_C999.001.035
FINAL CLOSURE GRADING CROSS SECTIONS VII
ALN_C999.001.036
FINAL CLOSURE GRADING CROSS SECTIONS VIII
ALN_C999.001.037
FINAL CLOSURE GRADING CROSS SECTIONS IX
ALN_C999.001.038
FINAL CLOSURE GRADING CROSS SECTIONS X
ALN_C999.001.039
FINAL CLOSURE GRADING DETAILS
ALN
C999.001.040
ON -SITE LANDFILL SCHEMATIC PLAN
ALN_C999.001.041
ON -SITE LANDFILL SCHEMATIC PLAN - CROSS SECTIONS
PREPARED FOR:
DUKE ENERGY (OWNER)
400 SOUTH TRYON ST.
CHARLOTTE, NC 28202
PREPARED BY:
AECOM
JAY D. MOKOTOFF, P.E.
1300 E. 9TH ST., SUITE 500
CLEVELAND, OH 44114
PHONE: [phone]
_ RAB I r
=. .f=�• �'-�'� r F,-d,,,, �'- _. _�._ ice' � � � • - _ 1
fi..r r• �.'°"a :,_ r �..� I���.,.,.�••���i CATAWBA RIVER/
k x
LAKE WYLIE.
- - i
_ AAB
N
SITE OVERVIEW MAP_
0 1000 2000 3000
GRAPHIC SCALE (IN FEET)
REV I DATE I JOB NO. I PROJECT TYPE I DES I DFTR I CHKD I ENG I APPD I DESCRIPTION
A 1 12/12/19 160603204 1 AB CLOSURE I ANR I AMC I JDM I JDM I JDM I ISSUED FOR APPROVAL
L�
1
LAT: N 35.1800
LONG: W 81.010
NOT FOR CONSTRUCTION
TITLE
COVER SHEET
A"=com ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
SEAL SCALE: AS SHOWN DES: ANR
DUKE DWG TYPE:. DWG DFTR: AMC
0 .�FESS�o, < ATJOB NO: 60603204 CHKD: JDM
:ti: ENFRGY®
:a SEAL y y DE: 12-12-19 ENGR: JDM
�043997 ''; � FILENAME: ALN C999.001 .01 1 COVER SHEET . DWG APPD: JDM
,L + -
�% �4`��� DWG SIZE DRAWING NO. REVISION
'��t ` ANSI D
121r2 jrq 22.0"x34.0" ALN C999.001.011 A
9 10
1 1

GENERAL NOTES
ALN C999.001.012
ay. A
1. PURPOSE
1.1. THIS DRAWING SET IS INTENDED FOR APPROVAL PURPOSES ONLY. IT WILL BE FURTHER DEVELOPED DURING THE
DESIGN PROCESS TO PREPARE CONSTRUCTION LEVEL DRAWINGS.
1.2. INFORMATION REGARDING THE PROPOSED ON -SITE LANDFILL IS CONCEPTUAL AND PROVIDED FOR INFORMATIONAL
PURPOSES ONLY. LANDFILL EXTENTS AND DESIGN DETAILS WILL BE INCLUDED IN A LANDFILL PERMIT APPLICATION TO BE
SUBMITTED TO THE NCDEQ SOLID WASTE SECTION UNDER SEPARATE COVER AFTER NCDEQ APPROVAL OF THIS
CLOSURE PLAN.
1.3. A CONCEPTUAL DAM BREACH IS REPRESENTED ON THE DRAWINGS FOR INFORMATION PURPOSES ONLY DUE TO ITS
INTERRELATION TO THE CLOSURE DESIGN. A COMPLETE DAM DECOMMISSIONING PERMIT APPLICATION WITH
ADDITIONAL DESIGN DETAIL AND/OR CHANGES WILL BE PROVIDED (IF NECESSARY) UNDER SEPARATE COVER AT A LATER
DATE YET TO BE DETERMINED.
1.4. RETIRED ASH BASIN (RAB) LANDFILL TO REMAIN IN OPERATION DURING CLOSURE.
2. PRELIMINARY CONSTRUCTION SEQUENCE:
2.1. REMOVE FREE WATER BY USING FLOATING PUMPS WITH SCREENED INTAKES AND ROUTE TO TEMPORARY WASTE WATER
TREATMENT SYSTEM INSTALLED TO MEET NPDES PERMIT REQUIREMENTS FOR FREE WATER REMOVAL (I.E. DECANTING).
PROCESS WATER FLOWS INTO THE ASH BASIN HAVE BEEN DIVERTED TO THE NEW LINED RETENTION BASIN SYSTEM AS
OF FEBRUARY 9TH, 2019.
2.2. INSTALL A PORE WATER REMOVAL/DEWATERING SYSTEM TO SUPPORT EXCAVATION AND CONSTRUCTION ACCESS.
2.3. START ASH EXCAVATION FROM THE PROPOSED CLOSURE BY EXCAVATION AREAS WHERE THE FUTURE ON -SITE LANDFILL
INITIAL CELL IS PROPOSED. EXCAVATED ASH TO BE TEMPORARILY PLACED IN STOCKPILE/PROCESSING AREAS WITHIN
THE APPROXIMATE ASH BASIN WASTE BOUNDARY (SPECIFIC LOCATIONS TBD). INSTRUMENTATION AND MONITORING
REQUIREMENTS TO BE DEVELOPED PRIOR TO CONSTRUCTION WILL BE FOLLOWED TO VERIFY CONSTRUCTION PHASE
STABILITY. CONSTRUCTION DEWATERING TO BE PERFORMED IN ACCORDANCE WITH DETAILED PLANS AND
SPECIFICATIONS TO BE DEVELOPED PRIOR TO CONSTRUCTION.
2.4. CONSTRUCT STORMWATER DIVERSION AREAS AND INITIAL PROPOSED ON -SITE LANDFILL CELL. PLACE THE PROCESSED
EXCAVATED ASH IN THE CONSTRUCTED ON -SITE LANDFILL CELL.
2.5. PROCEED WITH ON -SITE LANDFILL CELL CONSTRUCTION WITHIN THE EXCAVATED PORTIONS OF THE ASH BASIN AND
SEQUENCE ASH EXCAVATION TO PLACE THE EXCAVATED ASH INTO THE PROPOSED ON -SITE LANDFILL. DEWATERING OF
THE ASH WILL BE NEEDED TO MEET THE COMPACTION REQUIREMENTS FOR LANDFILL PLACEMENT. COMPLETE ASH
EXCAVATION AS VISUALLY VERIFIED AND AS CONFIRMED BY GRID SOIL SAMPLING/TESTING PROGRAM.
2.6. START REMOVAL OF THE ASH BASIN DAMS. USE APPROVED PORTIONS OF THE DAM SOIL FOR FINAL COVER OF THE
PROPOSED ON -SITE LANDFILL, STORMWATER BASIN BERMS, AND GRADING FILL WITHIN THE EXCAVATED ASH BASIN.
SEQUENCE DAM BREACHING WITH CONSTRUCTION OF PROPOSED STORMWATER DETENTION AND RETENTION BASINS. IN
ADDITION, SEQUENCE DAM BREACHING TO FOLLOW REGULATORY REQUIREMENTS FOR INFLOW DESIGN FLOOD
MANAGEMENT. DETAILED CONSTRUCTION SEQUENCING PLAN TO BE DEVELOPED PRIOR TO CONSTRUCTION AND
FOLLOWED.
2.7. COMPLETE DAM BREACHES. COMPLETE CLOSURE BY EXCAVATION VERIFICATION BY GRID SOIL SAMPLING/TESTING
PROGRAM. COMPLETE CONSTRUCTION OF PROPOSED SURFACE WATER DETENTION AND RETENTION BASINS. COMPLETE
CLOSURE OF THE PROPOSED ON -SITE LANDFILL.
3. DATUM
3.1. ALL ELEVATIONS SHOWN IN THESE DRAWINGS ARE REFERENCED TO NORTH AMERICAN VERTICAL DATUM, 1988 (NAVD).
ELEVATIONS ARE IN FEET.
3.2. HORIZONTAL DATUM (SHOWN IN FEET): NORTH AMERICAN DATUM, 1983 (NAD83 NC STATE PLANES).
4. REFERENCES
4.1. THE EXISTING SURVEY INFORMATION (TOPOGRAPHY, PLANIMETRICS, ETC.) IS BASED ON THE TOPOGRAPHIC SURVEY
PERFORMED BY WSP IN FEBRUARY 2015, AND HAS BEEN UPDATED BASED ON ADDITIONAL AERIAL SURVEY OF THE
LANDFILL AND ITS VICINITY PERFORMED BY STEWART, INC. IN JUNE 2018.
4.2. CONTOURS DEPICTED BENEATH THE WATER SURFACE WERE OBTAINED FROM AMEC'S WASTE STRATEGY ANALYSIS
REPORT DATED APRIL 2015.
4.3. SURFACE WATER ELEVATIONS PRESENTED IN THESE DRAWINGS ARE BASED ON THE TOPOGRAPHIC SURVEY
PERFORMED BY WSP IN FEBRUARY 2015.
4.4. HISTORICAL 5 FOOT CONTOURS WERE DIGITIZED FROM DUKE DRAWING NO. A3350-1B TITLED "ASH STORAGE BASIN,
GENERAL PLAN, AS BUILT TOPOGRAPHY" -PREPARED BY DUKE POWER COMPANY, DATED 11-11-1975. VERTICAL DATUM
CONVERTED FROM NGVD29 TO NAVD88 (DATUM SHIFT OF -0.75 FEET WAS APPLIED). THE HISTORICAL CONTOURS ARE
ASSUMED TO BE SYNONYMOUS WITH THE BOTTOM OF CCR MATERIAL WITHIN THE LIMITS OF IMPOUNDED ASH.
4.5. THE APPROXIMATE ASH BASIN WASTE BOUNDARY PRESENTED IN THIS DRAWING WAS PROVIDED BY SYNTERRA, DATED
FEBRUARY 2018. BOUNDARY IS APPROXIMATE AND WILL BE VERIFIED DURING CLOSURE.
4.6. THE BOUNDARY OF THE RETIRED ASH BASIN LANDFILL (PERMIT # 36-12) PRESENTED IN THESE DRAWINGS WAS PROVIDED
BY DUKE ENERGY.
4.7. PROPERTY BOUNDARIES AND THE EXTENTS OF LAKE WYLIE PRESENTED IN THESE DRAWINGS ARE BASED ON THE
GASTON COUNTY GIS (GIS.GASTONGOV.COM) AND REFERENCED WITHIN THE TOPOGRAPHIC SURVEY PERFORMED BY
WSP IN FEBRUARY 2015.
4.8. THE AERIAL PHOTOGRAPH WAS OBTAINED FROM GOOGLE © 2019.
4.9. POTENTIAL JURISDICTIONAL STREAMS AND WETLANDS AND ENDANGERED SPECIES WITHIN THE DUKE ENERGY
PROPERTY BOUNDARY PRESENTED IN THESE DRAWINGS ARE BASED ON THE "NATURAL RESOURCES TECHNICAL REPORT
- ALLEN STEAM STATION, FIGURE 6 - JURISDICTIONAL WATERS MAP" PREPARED BY AMEC AND SUBMITTED TO DUKE ON
J U N E 24, 2015.
4.10. THE RAB LANDFILL IS CURRENTLY ACTIVE AND WILL NOT BE CLOSED AS PART OF THIS CLOSURE PLAN. THE CLOSURE
DESIGN FOR THE RAB LANDFILL WAS PREPARED BY S&ME ("ENGINEERING PLAN DRAWINGS, RAB - ASH LANDFILL", MARCH
2008). FOLLOWING CONSTRUCTION OF THE RAB CLOSURE, THE DESIGN FOR THE CLOSURE OF THE RAB LANDFILL WILL
REQUIRE MODIFICATION TO ACCOMMODATE THE AS -BUILT CONDITIONS OF THE CLOSURE OF THE SURROUNDING RAB
AREAS.
DETAIL IDENTIFYING
NUMBER
SHEET NO. WHERE
DETAIL IS SHOWN
DETAIL REFERENCE ON SHEET WHERE DETAIL IS CALLED OUT
SECTION IDENTIFYING
LETTER
SECTION REFERENCE ON SHEET WHERE SECTION IS CALLED OUT
DETAIL OR SECTION TITLE
DETAIL IDENTIFYING NUMBER OR
SECTION IDENTIFYING LETTER
SHEET NO. WHERE DETAIL
OR SECTION IS CALLED OUT
DETAIL OR SECTION, NUMBER OR LETTER & TITLE
ON SHEET WHERE DETAIL OR SECTION IS SHOWN
63
625
ILL ILL
..........................
100—YR 100—YR
W.S.E.
Y
i
LEGEND
PROPOSED MAJOR CONTOUR
PROPOSED MINOR CONTOUR
EXISTING MAJOR CONTOUR
EXISTING MINOR CONTOUR
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
APPROXIMATE ASH BASIN WASTE BOUNDARY
LIMITS OF EXISTING RAB LANDFILL LINER
EXISTING DRAINAGE FLOW PATH
PROPOSED DRAINAGE FLOW PATH
ASH STORAGE BOUNDARY
100 YR FLOOD LINE
EXISTING OVERHEAD TRANSMISSION LINES
FENCE LINE
LIMITS OF WATER
WATER SURFACE ELEVATION
EXISTING PAVED ROADS
EXISTING UNPAVED ROADS
PROPOSED UNPAVED ROADS
RAILROAD
UTILITY POLE / TRANSMISSION POLE / TRANS. TOWER
TREELINE
EXISTING PIPES
EXISTING SLOPE DRAINS
RESIDENCES/STRUCTURES
MONITORING WELL
REMOVE EXISTING PAVED ROAD
REMOVE EXISTING UNPAVED ROAD
REMOVE EXISTING TREES/BUSHES
REMOVE EXISTING PIPE
- - - - - - - - - REMOVE EXISTING SLOPE DRAIN
HATCH LEGEND
MARSHY AREA
WETLAND
POTENTIAL HABITAT-
SCHWEINITZ'S SUNFLOWER
REMOVE EX. RIPRAP
REMOVE EX. WETLAND
SEAL
L=com
N.C. ENGINEERING LICENSE NO.
F-0342
OOf S SRO`7'�
4 SEAL y y
=� 043997 r-'
q� c�rv���.�'�
p • ...... gyp
Ml �, KtO��``��•
f2412 )lq
TITLE
REMOVE EXISTING STRUCTURE
CULVERT
- TRANSMISSION LINE MAX. SAG ELEVATIONS
NOT FOR CONSTRUCTION
GENERAL NOTES
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
FOR
ISSUED
FOR APPROVAL
ltft� DUKESCALE:
NoL' ENERGY®
NONE
DES:
ANR
DWG TYPE:.DWG
DFTR:
AMC
CHKD:
JDM
DATE: 12-12-19
ENGR:
JDM
FILENAME:
ALN C999.001 .012 GENERAL NOTES . DWG
APPD:
JDM
DWG SIZE
DRAWING NO.
REVISION
ANSI 22.0"x34.0" ALN C999.001 .012 A
1) 10
1
z
n
CD
CD
CD
0
0
N
0
D
INCHES 1 2 3 ITENTHS i0 20 30

ti
ALN C999.001 .01
1
mv• A
r
1
Alm
a ti
i
IIIIIIIIIIL •'
r*
lor
K
ML
f Re
INCHES
rJ
ALLEN STEAM STATION
PLANT ALLEN RD
-' COAL YARD �
♦ r�r ----�
I �
- -3 � ♦ ASH ,
♦ STORAGE 11 I � •1
RETIRED ASH BASIN i •* 1� -—
RETIRED ASH BASIN DIKE
(GASTO-016)
IN I
►; I
,i is ASH I I R
I 1 + I �''♦• FILL 2
/ I
ASH i RETIRED ASH BASIN 1
',,• ;, ; ; FILL 1 ,,------_---_y I
1--------_.---.-.-..•-•.-�
i I
I
• I
ob j
46
4%p L h�
` i ASH +0
RETIRED ASH BASIN p I STORAGE j� RETIRED ASH BASIN LANDFILL Ipwr
PERMIT NO. 36-12
I In i
I� ,,��-� •1�, '---------------------Awn
ACTIVE ASH BASIN
NORTH DIKE
* ` old
pIwpr
-qmpzje
1 .
*db _ OR, -*
I 1 Sam
1 1 -
' - ti
�.
- PRIMARY POND 3
APPR
X.
PRIMARY PRIMARY POND 2 PRE -DECANTING O
r 1 POND 1 APPROX. WSE 640.0' h
�— F.r PRE -DECANTING
ti A 1 I ! WSE 640.0' 1•
ir
a
J I _
'!ft
i- ' Q
W
mb
dhMIIm cn 0
I ' m U) II
4F W m
Q ` ■
Iii
d
POLISHING POND Q
_s F APPROX. _
PRE -DECANTING
100 WSE 635.0'
TENTHS 10 20 30
ACTIVE ASH BASIN
-� Imp
1 i#`
.Now .0000
pl
d --
F44
ti
LINED HOLDING BASIN
LAKE WYLIE/
CATAWBA RIVER
NORMAL W.S.E.
565.7 FT.
LAKE WYLIE/
CATAWBA RIVER
NORMAL W.S.E.
565.7 FT.
IF' LEGEND
-Aw.
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
------------------ ASH STORAGE BOUNDARY
W.S.E. WATER SURFACE ELEVATION
APPROXIMATE ASH BASIN WASTE BOUNDARY
1 /\ T r /1
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2. REFER TO SHEET ALN_C999.001.002 FOR REFERENCES.
3. THE AERIAL PHOTOGRAPH WAS OBTAINED FROM GOOGLE © 2019
L=com
N.C. ENGINEERING LICENSE NO.
F-0342
SEAL
CA
OF 1r 8 S/0
a SEAS
_ c• 0439q
'�.,�� Q -•.fir n� �ti •• � `�,.
NOT FOR CONSTRUCTION
TITLE
EXISTING CONDITIONS PLAN WITH
AERIAL MAP
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS -
GASTON COUNTY, NORTH CAROLINA
CBE
FOR
ISSUED FOR APPROVAL
D UKEDWG
`e ENERGY®
SCALE:
DES:
ANR
TYPE:.DWG
DFTR:
AMC
JOB
CHKD:
JDM
DATE: 12-12-19
ENGR:
JDM
FILENAME:
ALN_C999.001.013 EXISTING CONDITIONS PLAN WITH AERIAL.DWG
APPD:
JDM
DWG SIZE
DRAWING NO.
REVISION
ANSI
22.0"x34.0"
ALN C999 . 001 ■ 013
A
1)
10
1
I
0
1
W

xv. A
N.
ALLEN STEAM STATION \\\o
I op
c
\
ur%
l �� � � — — / / i // \ \ `) i J; ) Y � . \�— ✓�� r' � �'/ (/ +�_ `\ j `\` I '\ \`mow // 1
zZr
!C/ \ '\ _ ti /� 11 1 i \ / \
_ r{ ,II ��-�
, ----- \- /' - --- \ 1 RD I' ';',/ l \ WEIGH '�/i
r --- -- - T ALLEN _ -',
---- PLAN STATION !.' n I
— — — \ \y ` \ Ili /-\ \' COAL YARD
%-
\ I I I > � /i , I ✓� \ \ \ \ ^. , / 111 I � '�
w - `--`----'--- "• �', 1I���i ,i� , I I i `\ +. \\� \\ \ ') \ '\\ -\ • LINED♦ \ /O Lu ilI I HOLDING �\\\ O
// 1IIII 1 hr✓✓ J/1/ IllJ �tI
BASIN \\ l
— J / 1 ` , ASH STORAGE
WIII \\\ /
Ip W II I �I I II r
\\ 1 jl =__ — ^. ,- / `\ • I O; \ ,�, r ICI I III I;
OI ID ` `�
/-- fill / - ,�' I RETIRED l O w I ! r'- I I �I s I I I EX. SLUICE
// / I II COI O I @\\ \ �` �— _� �l�.l %—'��� 1
\ , 1_ ASH BASIN i p I / I I I II I IIIII \�\� �`\` ---- �.r c r/�
111 I I PIPES \ \ _ --� ) ( \ cam' V44
Co, Co t I I 1 I I \ , \_= I \�
/
° i / r _ I � 1 i' 1 111 I I I I I I \ \\`�/►^v - — ��
yam
l
RETIRED ASH BASIN DIKE -
!•_: i t I I TL 1 A482 / =
r TL 1A606 1 1l II II 11I II f, / \ ! — (GASTO-016)
(1 OOkV` I ` 1 / II ' 11 • I I III I �/ / t 1 \\y\\"�
)
(31D
i -■
TL 5N5 : l 11 �illil I I it II I ! �„ `:\1 r- J
►- __ / ! �_, 1 J ASH FILL 2
Z -- 1 , w' III I III
O II \ (500kV) 1 _. - • 1, �I1111 I i II /\\' �l \ rl II d~
r 1 \ I \ 1 � 1 111�11 I 1 1 I � � / _������ i _� .�—, h�f'�-6? h II p11
1 101 „s/ ���---- /, i \ \\`' no, C& I!& II Cell
1 l ••I 11 Wll�� (� `-.'_____---- ' RETIRED ASH BASIN Ill .11
TL 2A10 ` _( \ ASH FILL 1%= \ti III III
� ° ♦ O- � � `- / / � I\
\ / / ,'- ? -\ ; , )/ 230kV • SiZ`� \ \ Ilii _ \ \\ \\ _ _ _ fill,
( )\ 1\ 1 I I I -�aaaaaaaaa \ — I I
/ \ \ /' / r \ I / �� �,pc ♦ / /- �� \ \ 1 I II III I �r� �\� -- _ _7 _-��---- I I
_� l/ � II /i---� �--�ia�.r.-
I / �Yj w \ 1 I 1 I I 1 `� \ _ �laa---v�i�-_YMti _ - IIIIIIII
\� 1 I III �- . _
ASH FILL I I I I j1 III II Ci I I I h '= ILL
- ~ L --- - --' ----- - �_ -I IIIII ill
_--' ��' /' v ``e ' SLOPE 111111 MMI I I I ------- -__--_ ?r��� `— — — = _ _ ----_ — ____- — -. rl if ill
1 I r /-------- it 1 1 DRAIN Iji1 1 I �iliil II 1; IIII 1 _______________ \ ---- _-----------I II (IIIIIIII
_ // I I W 1 I I II I �' II III ( i�1� ;— — — — — — — ,\'----=ir? -- ---\ I IIII iiil �11
I /---�`. --- •---------- I� O I (TYP.) I I /I11 I11111 IIII 1 1— / .l�" ,( Jill II n1�11�1
\\--�.'' j�1 I f I I ►i ►i i i 1 i�i iill \ 1 liliil I C III RETIRED ASH BASIN LANDFILL 1 i i II 11111111
! ( _ RETIRED ASH �� I ! 1 illil II I11 Illi \\ it Ili It i111 i11 iiil it
BASIN 1 ASH STORAGE 41�/i — I;i� \\(IIIII I ii�l i�l�rri
1 ASH LANDFILL PERMIT NO. 36-12 II I
I I I \ \ \ li 1 I - i hill Ill II Ill,i IIIII III Ilil LOI 11 O O IC)RI SIC) Ir
i I I I O I 1 1 l O 1 p l I O I � r ( Cif 1 2 / N O
if I of I. �) I Iu')II IIIII l I, LANDFILL SLOPE DRAINS CD I o O cfl I co (o
1 \ \ h 5 it w 1 �I Ifnrf coIIIII 111)coIICo Jill I I II
ry 625.62 s I I O I Co I Cc)I I l I III I I (TYP., LOCATION 11. If
S Y I 1 •I I I n' TWIN EX I I I
LAKE WYLIE/
CATAWBA RIVER
NORMAL W.S.E. 565.7 FT.
Co j1 I I If IIIII I I !Ali l 1 APPROXIMATE) IIII IIIII IIII I I I
I II , IIIII TWIN EX. PIPES
_PIPES
--\ \ \ \\\�\'\\\ \ � ` `-\ \� � •, 1— �O� II I\ II IIIIIII I�
I IIIII `\II`-�°11l1 ilI
I IIIII
II11 TWIN EX. 36 RCP PIPES f I1II II III II
III; II I
1 \ • \` \ i �� I ` J �, ,III I III I I /////� I 1 l 1 I I---- - -II I
\ `--�\ \ \ \ -`� \ /-_ I W \�\`�\..�� l l IIIII jr/ �I'
_ \ p III � '; I I--_-=_- TWIN EX. PIPES :-- _--_--- _--=.,- �'L= _• 11 I
/' -• \�- \ \ ---- __ I ��III I III II � ''i' •�I \ � - � — _---- �- •t = _ _ --- -��Y� � � IIII II I
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ALN C999.001.014
LEGEND
— — — - 625 - — — — EXISTING MAJOR CONTOUR (25 FOOT)
EXISTING MINOR CONTOUR (5 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
LL LIMITS OF EXISTING RAB LANDFILL LINER
------------------ ASH STORAGE BOUNDARY
LIMITS OF WATER
100—YR 100 YR FLOOD LINE
0
Ain-rc: '
APPROXIMATE ASH BASIN WASTE BOUNDARY
HATCH LEGEND
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2. REFER TO SHEET ALN_C999.001.002 FOR REFERENCES.
3. POTENTIAL HABITAT FOR SCHWEINITZ'S SUNFLOWER WAS IDENTIFIED BY AMEC'S JUNE
24, 2015 NATURAL RESOURCES TECHNICAL REPORT. PRIOR TO LAND DISTURBANCE,
THE U.S. FISH AND WILDLIFE SERVICE MAY REQUIRE A BIOLOGICAL SURVEY OF THESE
AREAS.
4. POTENTIAL JURISDICTIONAL WATERS (STREAMS/WETLANDS) WERE IDENTIFIED BY
AMEC'S JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT AND SURVEYED BY
MCKIM & CREED IN FEBRUARY 2016. CONFIRMATION IS PENDING U.S. ARMY CORPS OF
ENGINEERS REVIEW.
5. WORK WITHIN THE 100-YEAR FLOODPLAIN ALONG THE SHORELINE OF THE CATAWBA
RIVER MAY REQUIRE PERMITTING.
6. EXISTING TRUCK WASH AND SCALES TO THE NORTH OF ASH FILL 1 MAY NOT BE
LOCATED WITHIN THE ASH BASIN LIMITS SHOWN ON THE DRAWINGS. THIS WILL NEED
TO BE VERIFIED PRIOR TO CONSTRUCTION.
0 300 600 900
NOT FOR CONSTRUCTION
GRAPHIC SCALE (IN FEET)
TITLE
A=COM
N.C. ENGINEERING LICENSE NO.
F-0342
SEAL
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SEAL v: y
043997 ~'
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EXISTING CONDITIONS PLAN WITH
TOPOGRAPHIC MAP
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS — CBE
GASTON COUNTY, NORTH CAROLINA
FOR ISSUED FOR APPROVAL
SCALE: AS SHOWN DES: ANR
DUKE DWG TYPE :. DWG DFTR : AMC
JOB ENERGY® DATE. 12-12-19 CHKD: JDM
ENGR: JDM
FILENAME: ALN_C999.001.014 EXISTING CONDITIONS PLAN WITH TOPOGRAPHIC MAP.DWG APPD: JDM
DWG SIZE DRAWING NO. REVISION
ANSI 22.0"x34.0" ALN C999.001.014 A
—
9 10
1 1
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0 INCHES 1 2 3 TENTHS 10 20 30 4 5 '
LAKE WYLIE/
CATAWBA RIVER
NORMAL W.S.E.
565.7 FT.
LAKE WYLIE 100-YEAR
FLOOD ELEVATION:
571.3 FT.
ALN_C999.001 .015
LEGEND
- - - - 630 - - - - EXISTING MAJOR CONTOUR (10 FOOT)
EXISTING MINOR CONTOUR (2 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
ILL LIMITS OF EXISTING RAB LANDFILL LINER
ASH STORAGE BOUNDARY
• • - • • - LIMITS OF WATER
100-YR 100 YR FLOOD LINE
APPROXIMATE ASH BASIN WASTE BOUNDARY
HATCH LEGEND
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
AIr1TrC%
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2. REFER TO SHEET ALN-C999.001.002 FOR REFERENCES.
3. POTENTIAL HABITAT FOR THE SCHWEINITZ'S SUNFLOWER WAS IDENTIFIED BY AMEC'S
JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT. PRIOR TO LAND
DISTURBANCE, THE U.S. FISH AND WILDLIFE SERVICE MAY REQUIRE A BIOLOGICAL
SURVEY OF THESE AREAS.
4. POTENTIAL JURISDICTIONAL WATERS (STREAMS/WETLANDS) WERE IDENTIFIED BY
AMEC'S JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT AND SURVEYED BY
MCKIM & CREED IN FEBRUARY 2016. CONFIRMATION IS PENDING U.S. ARMY CORPS OF
ENGINEERS REVIEW.
5. WORK WITHIN THE 100-YEAR FLOODPLAIN ALONG THE SHORELINE OF THE CATAWBA
RIVER MAY REQUIRE PERMITTING.
6. EXISTING TRUCK WASH AND SCALES TO THE NORTH OF ASH FILL 1 MAY NOT BE
LOCATED WITHIN THE ASH BASIN LIMITS SHOWN ON THE DRAWINGS. THIS WILL NEED
TO BE VERIFIED PRIOR TO CONSTRUCTION.
N P D ES 0 200 400 600
OUTFALL NOT FOR CONSTRUCTION
SWO15
GRAPHIC SCALE (IN FEET)
TITLE
EXISTING CONDITIONS PLAN -
P"=com
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR ISSUED FOR APPROVAL
F-0342
SEAL SCALE: AS SHOWN DES: ANR
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.�'-,- . \rS �< /I% JOB NO: 60603204 CHKD: JDM
: F S 1' � ENERGY®
a. SEAL y- y DATE: 12-12-19 ENGR: JDM
= c- ' 0439g7 r-: =
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.'' __ � _ �\ - 4/ r- - _� _ _ - _��\ \ _� \� _\ \ - / _\ \ 1 1 I I \ I 1 1 r I I / _,r I I \ \ \ \ \,II /
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/ I / , I / - `-- , \ `--/\\\ �.� - - _ �. -= A -*�. _ I ► - ' / / / ,--- - `-- 1 \ I / / / / / / I \ I I � ----' I r '-- I \` 1
/- /- i \ \\ - _ ` _ \i I i �' i - \\ _\\ \ I , I / / j I I t' -' - / / I I % / \ I It \III /
/ , / . . - - \ 1>>>e`-'-�11 I 1 II_--__ / / ,i'--\ I 1 1 / / , //c' / 1 1 I/l I------- v/ ' -'/ --i�il /
/ / / \ \\ I 1 / / / \ -, -\ _J I I ( \ I \ I I \ / _
/' / / , I7 \ \� I / , /i . , /' _-`. \ \ \. `\ -' 1 1 , l 1 I I \ 1 1 / - - - / ,'"I �, ,.--__\` _ ' I \ i I ` \\ \ \\ `-\ I I l / I J \\\\�N -- _- %f�-'�i � -' -
TENTHS INCHES 1 2 3 1 10
ALN_C999.001.016
LEGEND
- - - - 630 - - - - EXISTING MAJOR CONTOUR (10 FOOT)
EXISTING MINOR CONTOUR (2 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
LL LIMITS OF EXISTING RAB LANDFILL LINER
•""""""""' ASH STORAGE BOUNDARY
- • • • • LIMITS OF WATER
100-� 100 YR FLOOD LINE
APPROXIMATE ASH BASIN WASTE BOUNDARY
HATCH LEGEND
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
n1nTCC
z
0
1.
LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
'
0
2.
REFER TO SHEET ALN C999.001.002 FOR REFERENCES.
0
_
_.L
3.
POTENTIAL HABITAT FOR SCHWEINITZ'S SUNFLOWER WAS IDENTIFIED BY AMEC'S JUNE
'
24, 2015 NATURAL RESOURCES TECHNICAL REPORT. PRIOR TO LAND DISTURBANCE,
0
THE U.S. FISH AND WILDLIFE SERVICE MAY REQUIRE A BIOLOGICAL SURVEY OF THESE
1
0
AREAS.
4.
POTENTIAL JURISDICTIONAL WATERS (STREAMS/WETLANDS) WERE IDENTIFIED BY
AMEC'S JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT AND SURVEYED BY
MCKIM & CREED IN FEBRUARY 2016. CONFIRMATION IS PENDING U.S. ARMY CORPS OF
N
ENGINEERS REVIEW.
5.
WORK WITHIN THE 100-YEAR FLOODPLAIN ALONG THE SHORELINE OF THE CATAWBA
RIVER MAY REQUIRE PERMITTING.
-
0 200 400 600
NOT FOR CONSTRUCTION
GRAPHIC SCALE (IN FEET)
TITLE
EXISTING CONDITIONS PLAN -
AA� ACTIVE ASH BASIN
� ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR ISSUED FOR APPROVAL
F-0342
SEAL SCALE: AS SHOWN DES: ANR
\���`N Af / DUKE
R DWG TYPE:.DWG DFTR: AMC
_���`O� QFsS's - �<10. ' JOB N0: 60603204 CHKD: JDM
_ ;'� sEA� q: y __ ENERGY® DATE: 12-12-19 ENGR: JDM
=q -w � FILENAME: ALN_C999.001.015 016 EXISTING CONDITIONS PLAN. DWG APPD: JDM
., Q '. ,••.. 0 `N\ DWG SIZE DRAWING NO. REVISION
I _\ .
\MO\�\\\
lit K111
22.0' x34..0"1r�/2zJALN C999 . 001 . 016 A
9 10
1 1

ALN_C999.001.017
LEGEND
xv• A
ipw.-,m I lr l
ANWW or IN
4
F lkp-w
ANWW-01
ML CCR-26D '
CCR-26S
i
A 1 • ��
GWA-8SA ■ +
GWA-8S GWA-7D 4L - t
GWA-8 GWA-7
GWA-8D GWA-7
- `
BGSB-GW-B
-
GWA-7S CP-1 S;
GWA-17D
PLANT ALLEN RD
COAL YARD
AB 10hh' a
*Now Of
ol
400001
■
=D 4OCCR-
B-2 • «!i► i I i ♦ h'ASH ��,STORAGE 4 ;; .'
all
fill
;;h_ - «-
-.«-
AS H BASIN - 3
• ■ r ■
■ ■ ■ :�
wa
i■ : : L� ,�
.. ■ kt TIRE*AdAH
■■ ■ ■ ■ ti,
i■■ ■ ■ ;
■ ■■ ■ ■
. « ■ ■ ■ ■ ■
BG—lD ■■ . . . an . . • ,
BG-lS`.� lilt
ASH ; ; ;
«- • FILL 2 r '
a IL
04
. a ' ■ ■ — :
■ ■
= ; . ASH -
••'~ a , FILL 1
low g•ram■••••• .i♦� _ : �1 ♦■■■■■■■■■■■■■■■■!�■■■■■■■■■ ■ ■■■■■■■■
• RETIRED ASH BASIN
■
• 41 ■ ■ ■ ■
• ■4111
174 41 ■ ■ ■ ■
■ : ■ ■
■ h'
■ ■ ; ■ ■ILI
■
■
■ 4b Ji■ ■ «- ' «-
ASH + : '
STORAGE
LEA
,
INCHES
RETIRED
ASH BASIN
IN DIKE
ip BEEN 1
RETIRED ASH BASIN LANDFILL
'
ASH LANDFILL PERMIT NO. 36-12
■
..
■■
■
.
■
�.; ;
•
«.
40
jr
4w
.i.••
�■■■■-
..•
71
■■■■■
-
•.�♦
■
P•."♦
_
« AO i.i,�L BASIN
•
, �nlKE
a
NORT
.A
r •
.poor-r" prr- -
jr
.. F ,
2 3 TENTHS 10 20 30
PRIMARY
POND 1
T bo
PRIMARY
POND 2
APPROX.
PRE -DECANTING
WSE 640.0'
IIIIIIIIIIII� ,
rw
FI-
PRIMARY POND 3
APPROX.
PRE -DECANTING
WSE 640.0'
a
LINED
HOLDING
BASIN
A LAKE WYLIE/
� CATAWBA RIVER
NORMAL W.S.E.
� 565.7 FT.
W.S.E
S—X
x URS—X—B/S—X
CPT—URS—X—S
AB—X/GWA—X/BG—X
SB—X
CCR—X
B—X
,oy_
B—X/OW—X
AB—X
CPT—X
{9} B—X
AB—X
S—x
Ow-x
P—X
AB—X,BG—X,CCR—X,CP—X
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
ASH STORAGE BOUNDARY
APPROXIMATE ASH BASIN WASTE BOUNDARY
WATER SURFACE ELEVATION
AECOM SOIL BORING LOCATION (2015)
AECOM SOIL BORING LOCATION (2015/2014)
AECOM CPT SOUNDING LOCATION (2014)
HDR SOIL BORING/CAMA ASSESSMENT
WELL LOCATION (2015)
HDR SOIL BORING LOCATION (2015)
CCR MONITORING WELL (HDR 2016/2017)
S&ME SOIL BORING/MONITORING WELL
LOCATION (2010)
S&ME SOIL BORING/MONITORING WELL
LOCATION (2007)
S&ME EXISTING ASH BASIN VOLUNTARY
GROUNDWATER MONITORING WELL LOCATION (2004)
S&ME CPT SOUNDING LOCATION (2007)
MACTEC SOIL BORINGS LOCATION PERFORMED
FOR HDR (2011)
MACTEC EXISTING ASH BASIN COMPLIANCE
GROUNDWATER MONITORING WELL LOCATION (2010)
MACTEC CPT SOUNDING LOCATION PERFORMED
PREFORMED FOR HDR (2011)
DUKE EXISTING OBSERVATION WELL (1983)
DUKE EXISTING PIEZOMETERS WELL (1983)
CAMA CCR MONITORING WELL (SYNTERRA 2018)
A 1/'1Trn
1. AECOM SOIL BORING LOCATION (2015/2014) AND AECOM CONE PENETRATION TEST
LOCATION (2014) PRESENTED IN THIS DRAWING WERE PREFORMED/INSTALLED BY
URS. URS HAS SINCE BEEN ACQUIRED BY AECOM AND IS REFERRED TO AS SUCH IN
THIS DRAWING.
N
0 400 800 1200
NOT FOR CONSTRUCTION
GRAPHIC SCALE (IN FEET)
TITLE
SUBSURFACE EXPLORATION LOCATION
PLAN - RETIRED ASH BASIN
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
SEAL SCALE: AS SHOWN DES: ANR
DUKEH CgRo.,' DWG TYPE:. DWG DFTR: AMC
O .o sSS/, - �' ' JOB N0: 60603204 CHKD: JDM
— ,-4 SEAL y'; y = ENERGY® 1 DATE: 12-12-19 ENGR: JDM
+� ; �043997 44. = FILENAME: ALN_C999.001.017-018 SUBSURFACE EXPLORATION LOCATION PLAN.DWG APPD: JDM
�' 0��� DWG SIZE DRAWING NO. REVISION
'�✓It t�t0ANSI D
``,`
J21r jIq 22.0"x34.0" A L N C999.001.017 A
9 10
1 1

mv• A
AB-146R CPT-16 � �T
`PT-19f
W--18 CPT-15
fAB-29D CPT-URS-6-S
AB-14 A6-29
/6m
AB-30D CPT-20 �� AB-9S
AB-14D AB- � PP-:? — S-2 URS-4-B -// . �AB-9
-29
CPT-21 B 23 AB-9
GWA-14DA - OS 25 i AB-9D
GWA-14S
"` S-17 B-26
� - � �.. � \ • � .
GWA-14 -
GWA-141) - OW-16 �_1 `B-24 5 ' owl
/ its 27
GWA-14 B-22 J � � B-16 V
# B-3 - OW-22 S-3 ABS OW-1
OW-18 S_ -27
22 B-29
GWA- PN-1 D d S-10 OW-15 B-27 B-28
' B-23 S-20 C
GWA- B-2 AB-W-17 B-23 CPT-22 S-19 ' • .
28D
r ,
GWA-22S � •�
OW-21 AB-28S A828 . � CPT-23 A 1 �
+ p OW-2 r PRIMARY B-30 PRIMARY POND 3 CCR -14S
• PN-2D
� S-1 • D CPT-24 APPROX. CCR-140
B-1/OW--20 APPROX-DECANTING B-11
CPT-URS-B-S -PRE
PRE -DECANTING B31 ��', �S-12
• CPT-URS-8-S
111=� PRIMARY ow-1 AB-24S AB-25S � S-14
-
• AB-25SL
� AB-26D S -13
AB-13S AB-24SL
r AB-13 AB-24D � AB
-25BRU AB-26S GWA BRA
40 AB-24 -/� AB
AB-13D :: = � AB-24 � AB-25BR AB-26 J000' —GWA-3
CPT-URS-11-S GWA-3S
CPT-URS-11-S
T - r \S-10 SB-9
AL ow-2 CPT-URS-2 SWA-3D
-Rp
!JR.
Ila
INCHES 1 2 3 TENTHS 10 20 30
u
w
ACTIVE ASH BASIN
f
ti
iiZ`--:
or
ALN_C999.001.018
LEGEND
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
------------------
ASH STORAGE BOUNDARY
APPROXIMATE ASH BASIN WASTE BOUNDARY
W.S.E.
WATER SURFACE ELEVATION
�}
S-X
AECOM SOIL BORING LOCATION (2015)
�C
URS-X-B/S-X
AECOM SOIL BORING LOCATION (2015/2014)
CPT-URS-X-S
AECOM CPT SOUNDING LOCATION (2014)
AB-X/GWA-X/BG-X
HDR SOIL BORING/CAMA ASSESSMENT
WELL LOCATION (2015)
l
�}
SB-X
HDR SOIL BORING LOCATION (2015)
x
CCR-X
CCR MONITORING WELL (HDR 2016/2017)
S&ME SOIL BORING/MONITORING WELL
B-X
LOCATION (2010)
B-X/OW-X
S&ME SOIL BORING/MONITORING WELL
LOCATION (2007)
AB-X
S&ME EXISTING ASH BASIN VOLUNTARY
GROUNDWATER MONITORING WELL LOCATION (2004)
CPT-X
S&ME CPT SOUNDING LOCATION (2007)
l�
{
B-X
MACTEC SOIL BORINGS LOCATION PERFORMED
FOR HDR (2011)
MACTEC EXISTING ASH BASIN COMPLIANCE
4
AB-X
GROUNDWATER MONITORING WELL LOCATION (2010)
S-X
MACTEC CPT SOUNDING LOCATION PERFORMED
PREFORMED FOR HDR (2011)
�}
OW-X
DUKE EXISTING OBSERVATION WELL (1983)
P-X
DUKE EXISTING PIEZOMETERS WELL (1983)
x
AB-X,BG-X,CCR-X,CP-X
CAMA CCR MONITORING WELL (SYNTERRA 2018)
POLISHING POND I NOTES
* APPROX. I 1. AECOM SOIL BORING LOCATION (2015/2014) AND AECOM CONE PENETRATION TEST LOCATION
ow
PRE -DECANTING I
«_ 3 (2014) PRESENTED IN THIS DRAWING WERE PREFORMED/INSTALLED BY URS. URS HAS SINCE
WSE 635.0' BEEN ACQUIRED BY AECOM AND IS REFERRED TO AS SUCH IN THIS DRAWING. z
« I
c�
cfl
/--AB 22D AB-10S CD
• CD
p 9 - lo�
•• O
• O
«-
-
O
• 00
At
' N
rS^ «' 11
.t
PH WELL m
or
000
w-
«. •�
0 200 400 600
wo
NOT FOR CONSTRUCTION
ti • GRAPHIC SCALE (IN FEET)
TITLE
SUBSURFACE EXPLORATION LOCATION
PLAN - ACTIVE ASH BASIN
GWA-IS A"=com ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
SEAL 1lA11J,,, SCALE: AS SHOWN DES: ANR
���H ,�CgRo.,DUKE DWG TYPE:. DWG DFTR: AMC
` O FsS`' � ENERGY® JOB N0: 60603204 CHKD: JDM
� O O •. 7
,=4 SFAS y': y " DATE: 12-12-19 ENGR: JDM
p; �043gg7 44. = FILENAME: ALN_C999.001.017-018 SUBSURFACE EXPLORATION LOCATION PLAN.DWG APPD: JDM
�" o 0 `�� DWG SIZE DRAWING NO. REVISION
' •V�111)171%
ANSI D
�1 f r2 22.0"x34.0" ALN C999.001.018 A
6 7 8 !9 10

ALN C999.001.019
Ru. A
INCHES
I I \ \\1 II /kk
\ \\
l ( ALLEN STEAM STATIONOlt- \\
` \✓r/i \� ' \ / iN, %11%.-1 - I
by Il 11�L
/%' _i \ / \\ -_ 1 / J� w /� 1 /1 11 11 �� 'emu r
---- PLANT ALLgU RD ,( '''%' `Jli� i J �i .lr./; 11�i\_,_II i ��j1Y
— COAL YARD
`
I 1 \ 1 I _--'-� �- \ , \ \ \ I\ •' > r/ �� l Ill/ (�� 1 1 0, \�I 1
/ I \\fly III LINED \\ ( I k� r / �. / / I i U \\
I \ \—' i i \•`` \\ \ ; \ 1 \\ 5,r/ov�n,� �Jr/� III`d HOLDING �\ rN 0�I
8 - - / _ — — - t BASIN
/ O w lil -625' — ,^`__ \\� _ , / �� \ \ ,- \ \ r__"tr\^�%/ I � III \�\
, , -- - `\ \ / �\ \ , \ / 1 r, till
\ `/�\, i
O— '— !\
VI
/ tfj /III—_IffJ
600 _--\`\ `\\ `\`@\\\ `\ \\\� — �<<
lam!\ _ t— ♦ = — . _. _ �`� `\� �\ \ — — v
na
N.
ON. r , \\\\ _ -_=
�I-' \\ -� `\ \\`\\ \ \ \ \ \ - \\ \` ` --__ ;RETIRED ASH BASIN DIKE
TL 1 A482 1 \ — --- ---\\� \
TL1A606 ` O \\ \`: `` \ `\ 100kV I `\ _--��--- (GASTO-016)
N. // \ \ \ \ \ \n\ `\ \ \ 1 ---------------
\\\\\\\\\\
Ld
\ \_ _
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TL 5N5 `\_ -- % = —` ``-- I I III I1
1 t J I ' / 1 I j 1 \\\` ��� ``� ----'' % \ / /' /' IIIIIII I11ll JIIIIII
1 II 1 (500kV) 1 / W // / I l ``\\� �`\`_'�i ` -' �� _ — — ' '' II IIII IIII II p11
1 I \ III IIII III I I
r\ I l r \\\ \\ I III IIp11
P ' J / SSO` \�\\\ _/ TL 2A10 J,Cp \\ \t \1 Ili % _ — ���� \ \\`_-'' 11 fill IIII Ill/ III
/ \ \ \ \\\ \ \ / _/ 1 II IIIIIIII 11 III
(230kV)--------' / LLLI \\IIII ill/ III
LLJ
�/ / O� ,' / i � \`= ` \ \ \ ,/ / I IIIIIII
O / ,' IIIIII 111 I 1 J � \ /
-\\----------' '' IIIIIIII
I Ifni 111
Ej I ­e- Lu I,
PHASE 1 PERMIT LIMITS OF
\\ EXISTING RETIRED ASH BASIN co J
_ \ __ LANDFILLit
--- - IIIIIII
uj
O O w
T ` `` ` _ - _�_ `\ \ 1 `\� II
\ \\ J� I
It \ \�\\\ `\ \ �"� / _ `\ \\ /%-`\ `� �\ ��/ `�` IIII I1 I
I LLJ III
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4 \ I I II
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\
IIII j1 I
NPDES
n i \ \ j 11 �11 / /r / / \ IIII I I III IIII f �, ; / III IIII III IIIII IIII
II ` / / / III Illlllll / r / IIIII IIIIII ll OUTFACE
�� i J�IIiiJ JJJIJ�ii / / I / JJJIJJIIlJ1i JJJIJ Iiil SWO15
cc)I \ / / 1,11 \\\ \ \\ l \ ( IIII IIIIIII IIIII I I I
®L � ® I�1111 \11\\Ijjl / j � !l i �11��l�jllllll jjlll Ijl
I \ -- — `----- '/ — / ,/ / € il' " ll / / I i %/ IJJIIIIJJJIJJi nl I i I I
I\ll`= = Il�€ � ,/ l I¢/� IIIIII II IIIII I(I
/
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O ` ' 650 ' / �'' / / / (100kV) . \ `\\ IIII IJ111iJ IIIII IIIIII
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— — — — — — — — — ESTIMATED BOTTOM OF ASH MAJOR CONTOUR (25 FOOT)
ESTIMATED BOTTOM OF ASH MINOR CONTOUR (5 FOOT)
— — — — — — — — — EXISTING MAJOR CONTOUR OUTSIDE OF ASH BASIN (25 FOOT)
EXISTING MINOR CONTOUR OUTSIDE OF ASH BASIN (5 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
LL LIMITS OF EXISTING RAB LANDFILL LINER
APPROXIMATE ASH BASIN WASTE BOUNDARY
LIMITS OF WATER
100—YR 100 YR FLOOD LINE
HATCH LEGEND
WETLAND (SEE NOTE 4)
LAKE WYLIE POTENTIAL HABITAT - SCHWEINITZ'S
100-YEAR FLOOD SUNFLOWER (SEE NOTE 3)
ELEVATION: 571.3 FT.
N
JURISDICTIONAL STREAM
LAKE WYLIE
100-YEAR FLOOD
ELEVATION:571.3 FT.
EXISTING RAB LANDFILL
AREA TO BE CAPPED IN PLACE
KInTPC
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2. REFER TO SHEET ALN_C999.001.002 FOR REFERENCES.
3. POTENTIAL HABITAT FOR SCHWEINITZ'S SUNFLOWER WAS IDENTIFIED BY AMEC'S JUNE
24, 2015 NATURAL RESOURCES TECHNICAL REPORT. PRIOR TO LAND DISTURBANCE,
THE U.S. FISH AND WILDLIFE SERVICE MAY REQUIRE A BIOLOGICAL SURVEY OF THESE
AREAS.
4. POTENTIAL JURISDICTIONAL WATERS (STREAMS/WETLANDS) WERE IDENTIFIED BY
AMEC'S JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT AND SURVEYED BY
MCKIM & CREED IN FEBRUARY 2016. CONFIRMATION IS PENDING U.S. ARMY CORPS OF
ENGINEERS REVIEW.
5. WORK WITHIN THE 100-YEAR FLOODPLAIN ALONG THE SHORELINE OF THE CATAWBA
RIVER MAY REQUIRE PERMITTING.
6. THE STORMWATER DRAINAGE DITCH SOUTH OF THE RAB LANDFILL IS LOCATED WITHIN
THE LANDFILL FACILITY BOUNDARY (BASED ON THE 2008 PERMIT TO CONSTRUCT
APPLICATION BY S&ME, DATED 3/26/2008) AND AS SUCH, ANY EXISTING IN -PLACE ASH IN
THIS AREA IS CONSIDERED ASH NOT SUBJECT TO CAMA AND THUS DOES NOT REQUIRE
REMOVAL.
0 300 600 900
NOT FOR CONSTRUCTION
GRAPHIC SCALE (IN FEET)
NPDES
OUTFALL TITLE
002 ESTIMATED BOTTOM OF ASH CONTOUR
MAP
PERMITTED SPILLWAY ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR
JURISDICTIONAL STREAM F-0342 ISSUED FOR APPROVAL
SEAL SCALE: AS SHOWN DES: ANR
DUKE' DWG TYPE:.DWG DFTR: AMC
O .• FEss� �� JOB NO: 60603204 CHKD: JDM
�, ENERGY®
;'� SEAL y; y r DATE: 12-12-19 ENGR: JDM
04397 ~'
FILENAME: ALN C999.001.019 ESTIMATED BOTTOM OF ASH CONTOUR MAP.DWG APPD: JDM
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LAKE WYLIE/
CATAWBA RIVER
NORMAL W.S.E.
568.7 FT.
LAKE WYLIE
100-YEAR FLOOD
ELEVATION: 571.3 FT.
/.
/
ALN_C999.001.020
LEGEND
— — — - 630 - — — - ESTIMATED BOTTOM OF ASH MAJOR CONTOUR (10 FOOT)
ESTIMATED BOTTOM OF ASH MINOR CONTOUR (2 FOOT)
— — — - 630 - - EXISTING MAJOR CONTOUR OUTSIDE OF ASH BASIN (10 FOOT)
----------- EXISTING MINOR CONTOUR OUTSIDE OF ASH BASIN (2 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
— — — — — APPROXIMATE LIMITS OF IMPOUNDED ASH
LL LIMITS OF EXISTING RAB LANDFILL LINER
ASH STORAGE BOUNDARY
• • — • • — LIMITS OF WATER
100-YR 100 YR FLOOD LINE
APPROXIMATE ASH BASIN WASTE BOUNDARY
HATCH LEGEND
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
EXISTING RAB LANDFILL
AREA TO BE CAPPED IN PLACE
NOTES
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2. REFER TO SHEET ALN_C999.001.002 FOR REFERENCES.
3. POTENTIAL HABITAT FOR THE SCHWEINITZ'S SUNFLOWER WAS IDENTIFIED BY AMEC'S
JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT. PRIOR TO LAND
DISTURBANCE, THE U.S. FISH AND WILDLIFE SERVICE MAY REQUIRE A BIOLOGICAL
SURVEY OF THESE AREAS.
4. POTENTIAL JURISDICTIONAL WATERS (STREAMS/WETLANDS) WERE IDENTIFIED BY
AMEC'S JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT AND SURVEYED BY
MCKIM & CREED IN FEBRUARY 2016. CONFIRMATION IS PENDING U.S. ARMY CORPS OF
ENGINEERS REVIEW.
5. WORK WITHIN THE 100-YEAR FLOODPLAIN ALONG THE SHORELINE OF THE CATAWBA
RIVER MAY REQUIRE PERMITTING.
6. THE STORMWATER DRAINAGE DITCH SOUTH OF THE RAB LANDFILL IS LOCATED WITHIN
THE LANDFILL FACILITY BOUNDARY (BASED ON THE 2008 PERMIT TO CONSTRUCT
APPLICATION BY S&ME, DATED 3/26/2008) AND AS SUCH, ANY EXISTING IN -PLACE ASH IN
THIS AREA IS CONSIDERED ASH NOT SUBJECT TO CAMA AND THUS DOES NOT REQUIRE
REMOVAL.
lief ` EMERGENCY SPILLWAY
/ 1,,
� ,/ 0 200 400 600
1 PERMITTED SPILLWAY"? NOT FOR CONSTRUCTION
GRAPHIC SCALE (IN FEET)
TITLE
ESTIMATED BOTTOM OF ASH CONTOUR
P"=com
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR ISSUED FOR APPROVAL
F-0342
SEAL SCALE: AS SHOWN DES: ANR
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.`-�\O� -sS �< ,!; JOB NO: 60603204 CHKD: JDM
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` I _ :� SEAL y': y DATE: 12-12-19 ENGR: JDM
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ALN I w.v. A
LEGEND
ESTIMATED BOTTOM OF ASH MAJOR CONTOUR (10 FOOT)
ESTIMATED BOTTOM OF ASH MINOR CONTOUR (2 FOOT)
EXISTING MAJOR CONTOUR OUTSIDE OF ASH BASIN (10 FOOT)
EXISTING MINOR CONTOUR OUTSIDE OF ASH BASIN (2 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
- - - - - APPROXIMATE LIMITS OF IMPOUNDED ASH
LL LIMITS OF EXISTING RAB LANDFILL LINER
ASH STORAGE BOUNDARY
• • - • • - LIMITS OF WATER
100-YR 100 YR FLOOD LINE
APPROXIMATE ASH BASIN WASTE BOUNDARY
HATCH LEGEND
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
EXISTING RAB LANDFILL
AREA TO BE CAPPED IN PLACE
NOTES
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
D
r
2. REFER TO SHEET ALN_C999.001.002 FOR REFERENCES.
z
3. POTENTIAL HABITAT FOR THE SCHWEINITZ'S SUNFLOWER WAS IDENTIFIED BY AMEC'S
I
0
JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT. PRIOR TO LAND
DISTURBANCE, THE U.S. FISH AND WILDLIFE SERVICE MAY REQUIRE A BIOLOGICAL
SURVEY OF THESE AREAS.
4. POTENTIAL JURISDICTIONAL WATERS (STREAMS/WETLANDS) WERE IDENTIFIED BY
O
AMEC'S JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT AND SURVEYED BY
0
MCKIM & CREED IN FEBRUARY 2016. CONFIRMATION IS PENDING U.S. ARMY CORPS OF
III
ENGINEERS REVIEW.
O
5. WORK WITHIN THE 100-YEAR FLOODPLAIN ALONG THE SHORELINE OF THE CATAWBA
�
RIVER MAY REQUIRE PERMITTING.
6. THE STORMWATER DRAINAGE DITCH SOUTH OF THE RAB LANDFILL IS LOCATED WITHIN
THE LANDFILL FACILITY BOUNDARY (BASED ON THE 2008 PERMIT TO CONSTRUCT
APPLICATION BY S&ME, DATED 3/26/2008) AND AS SUCH, ANY EXISTING IN -PLACE ASH IN
THIS AREA IS CONSIDERED ASH NOT SUBJECT TO CAMA AND THUS DOES NOT REQUIRE
REMOVAL.
0
0 200 400 600
NOT FOR CONSTRUCTION
GRAPHIC SCALE (IN FEET)
TITLE
A=COM
SEAL
N.C. ENGINEERING LICENSE NO.
F-0342
ESTIMATED BOTTOM OF ASH CONTOUR
MAP - ACTIVE ASH BASIN
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
FOR ISSUED
FOR APPROVAL
"
r DUKE
ENERGY®
SCALE: AS SHOWN
DES:
ANR
DWG TYPE:. DWG
DFTR:
AMC
CHKD:
JDM
DATE: 12-12-19
ENGR:
JDM
FILENAME: ALN C999,001.020 021 ESTIMATED BOTTOM OF ASH CONTOUR MAP.DwG
APPD:
JDM
DWG SIZE
DRAWING NO.
REVISION
ANSI ALN C999.001.021 A
22.0"x34.0"
1 10
1
INCHES 1 2 3 'TENTHS i0

ALN C999.001 .022
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\ EXISTING MINOR CONTOUR (5 FOOT)
\
\ \`, DUKE ENERGY PROPERTY BOUNDARY
\ I`\ APPROXIMATE LIMITS OF IMPOUNDED ASH
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1 / / ,,e w c,\ / IN- -� _ - - __-------_------ -- ___________ _ - /%i/1 ' }!� TO BE DEMOLISHED
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SPILLWAY 1111 I IIIII J ,
\ ' \ I ` -- \---- - -_- - - - - - UPGRADES CONSTRUCTED 11
\ -•__\ _ �.� SUMMER 2016 PER ALL-201, TO I11 Lo i i .0 1
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INCHES 1 2 3 TENTHS 10 20 30
0
KInTCC
LIMITS OF EXISTING RAB LANDFILL LINER
ASH STORAGE BOUNDARY
REMOVE EX. PAVED ROAD
REMOVE EX. UNPAVED ROAD
REMOVE EX. TREES/BUSHES
REMOVE EX. PIPE
REMOVE EX. SLOPE DRAIN
REMOVE EX. STRUCTURE
HATCH LEGEND
REMOVE EX. RIPRAP
1. THIS PLAN PROVIDES A SUMMARY OF CONCEPTUAL PLANS FOR DEMOLISHING
STRUCTURES ASSOCIATED WITH THE ASH BASIN AS PART OF CLOSURE. A DETAILED
DEMOLITION PLAN WILL BE DEVELOPED PRIOR TO CONSTRUCTION.
2. THE EXISTING AAB SPILLWAY WILL BE APPROPRIATELY DECOMMISSIONED.
3. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
4. REFER TO SHEET ALN_C999.001.002 FOR REFERENCES.
5. EXISTING VEGETATION WITHIN THE CLOSURE LIMITS MUST BE GRUBBED AND REMOVED.
6. THE RETIRED ASH BASIN LANDFILL IS ACTIVE. FEATURES ASSOCIATED WITH THE
LANDFILL WILL NOT BE DEMOLISHED AS PART OF THE ASH BASIN CLOSURE.
7. PERMITTING AND SCHEDULE IMPACTS ARE POSSIBLE FOR POTENTIALLY
ENVIRONMENTALLY SENSITIVE AREAS (E.G. WETLANDS, ENDANGERED SPECIES). THESE
IMPACTS WILL BE VETTED PRIOR TO CONSTRUCTION.
8. EXISTING SLUICE LINES, CULVERTS AND OTHER PIPES TO BE FULLY REMOVED, UNLESS
OTHERWISE INDICATED ON THE PLANS.
9. EXISTING ROADS WITHIN CLOSURE AREA TO BE CAPPED AND REGRADED OR REMOVED
AS NEEDED.
10. FREE WATER REMOVAL TO BE PERFORMED AS PART OF CLOSURE PROCESS.
11. ABANDON WELLS AS NEEDED.
N 12. THE HIGH VOLTAGE OVERHEAD TRANSMISSION LINES WILL BE RELOCATED AS
NECESSARY TO FACILITATE CLOSURE ACTIVITIES.
13. EXISTING TRUCK WASH AND SCALES TO THE NORTH OF ASH FILL 1 MAY NOT BE LOCATED
WITHIN THE ASH BASIN LIMITS SHOWN ON THE DRAWINGS. THIS WILL NEED TO BE
VERIFIED PRIOR TO CONSTRUCTION
0 200 400 600
GRAPHIC SCALE (IN FEET)
TITLE
NOT FOR CONSTRUCTION
DEMOLITION PLAN - RETIRED ASH
BASIN
loim=mcom ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
SEAL SCALE: AS SHOWN DES: ANR
\\,\Ilrirrllf//!/ DUNCE
N CgRo,,/ DWG TYPE:. DWG DFTR: AMC
=� O .• �,, JOB N0: 60603204 CHKD: JDM
ENERGY® SEAL y: y � DATE: 12-12-19 ENGR: JDM
= 0439971/ -
�q cr • k : FILENAME: ALN_C999.001 .022-023 DEMOLITION PLAIN APPD: JDM
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DWG SIZE DRAWING NO. REVISION
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LAKE WYLIE/
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Cps 1- 1\ I i 11 O I IC) \ \ -- — / / J BUILDING TO // i / \ J . \ / / / \ c5`
(9 1 I /-
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/ I /�- , \ it 1l 1 1 111 1
i s0, `----- - 17 — / ��,\ / GEOTUBE TO BE 1^I --,\ `' `
� ! o , / / i // / REMOVED J - � \\ 1\ \
Hl
/ / 1ll/ / J /_/ \� N\� 1 / I I I I I I I i i 1 1 1 \\ \\ \\ 1 tl 11111 1 I I I OI� \\\
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I 1 / 1 1 / / / I \,`- WW / / l / i 1 \\ I N �I N I \ \ \
/ 1 / . � / } / / , \ III I OI \\`
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r ww r' I I 1 . • /' /'' ` /Lo If' \I 1 ` \1 \`—'fir Iil Ilili llill \I /1
oo ^ \I �i ' ACTIVE ASH BASIN—
I\`-
j W W } r) I �/ \ UI • • //r \\\ \\\ l\J J L\ \ / //�I
/ } O O J \ Is / r% / 1 1 I I I I I I 1 1
0 r� // \I. • •�� ,' \\ /,ci / 1 i / l i �i�Hil1 i1lliiii I ` �--
/ 0 1 / / �/ /J \ \\ /� ,^\ 'r I \\ I +I i i I l 1 I I 1 1 i
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/ \ I •• \ / I 11 1 1 1 11l 111I11 l
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ow `\ \`\6 o \ ABANDON SPILLWAY
�\, `w w -r IIl +tI1I11lIi lI 11IIIi i1IIII IliI1 I1II IIIIli IIIIiIIiIIliIiii1III1 IIlIIllIIlI lI i1I1(iil1 1I Il1I1
O
OO (\\ (SEE
NOTE 12)Lu U-RISER AND
O O I1 i11w Glo INSTRUMENTS TO
\• REMOVETREES BE DEMOLISHEDo ww
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111i ,o
oo O (TYP.)
IIIII
1
' W `\\) `i�IbCHEMICAL .rr I
—off -' 6s \• / iG-.� o___ , BUILDING (TO \� --`\ \ i// i/l'o 1 i►�r�
0 / /00
BE REMOVED _ / / / ► 1 \
nn
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1 \ \ J J , / r 1 EXISTING WTS
\\ \\ •_ ice' /' Cps ,__� 6'> �•_-_ J !' /-`\ \\ `\ \♦ \ \\ ` �N
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\ \ / / j / \\_'\ 11 I I INNN
INCHES 1 2 3 TENTHS 10 20 30
ALN_C999.001.023
LEGEND
— — — — 625 — — — —
EXISTING MAJOR CONTOUR (25 FOOT)
EXISTING MINOR CONTOUR (5 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
r
APPROXIMATE ASH BASIN WASTE BOUNDARY
LL
LIMITS OF EXISTING RAB LANDFILL LINER
""""""""'•
ASH STORAGE BOUNDARY
REMOVE EX. PAVED ROAD
REMOVE EX. UNPAVED ROAD
REMOVE EX. TREES/BUSHES
---------
REMOVE EX. PIPE
— — — — — — — — —
REMOVE EX. SLOPE DRAIN
REMOVE EX. STRUCTURE
HATCH LEGEND
REMOVE EX. RIPRAP
IA 1 /\ T i f11
1. THIS PLAN PROVIDES A SUMMARY OF CONCEPTUAL PLANS FOR DEMOLISHING STRUCTURES
ASSOCIATED WITH THE ASH BASIN AS PART OF CLOSURE. A DETAILED DEMOLITION PLAN WILL BE
DEVELOPED PRIOR TO CONSTRUCTION.
2. THE EXISTING AAB SPILLWAY WILL BE APPROPRIATELY DECOMMISSIONED.
3. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
4. REFER TO SHEET ALN_C999.001.002 FOR REFERENCES.
5. EXISTING VEGETATION WITHIN THE CLOSURE LIMITS MUST BE GRUBBED AND REMOVED.
6. THE RETIRED ASH BASIN LANDFILL IS ACTIVE. FEATURES ASSOCIATED WITH THE LANDFILL WILL
NOT BE DEMOLISHED AS PART OF THE ASH BASIN CLOSURE.
7. PERMITTING AND SCHEDULE IMPACTS ARE POSSIBLE FOR POTENTIALLY ENVIRONMENTALLY
SENSITIVE AREAS (E.G. WETLANDS, ENDANGERED SPECIES). THESE IMPACTS WILL BE VETTED
PRIOR TO CONSTRUCTION.
8. EXISTING SLUICE LINES, CULVERTS AND OTHER PIPES TO BE FULLY REMOVED, UNLESS OTHERWISE
INDICATED ON THE PLANS.
9. EXISTING ROADS WITHIN CLOSURE AREA TO BE REMOVED AS NEEDED.
10. FREE WATER REMOVAL TO BE PERFORMED AS PART OF CLOSURE PROCESS.
11. ABANDON WELLS AS NEEDED.
12. EXISTING SPILLWAY LOCATED IN SOUTHEAST CORNER OF AAB TO BE ABANDONED IN -PLACE BY
N GROUTING AFTER NEW OUTLET CONSTRUCTED.
13. THE HIGH VOLTAGE OVERHEAD TRANSMISSION LINES WILL BE RELOCATED AS NECESSARY TO
FACILITATE CLOSURE ACTIVITIES.
14. EXISTING TRUCK WASH AND SCALES TO THE NORTH OF ASH FILL 1 MAY NOT BE LOCATED WITHIN
THE ASH BASIN LIMITS SHOWN ON THE DRAWINGS. THIS WILL NEED TO BE VERIFIED PRIOR TO
CONSTRUCTION.
0 200 400 600
NOT FOR CONSTRUCTION
GRAPHIC SCALE (IN FEET)
TITLE
DEMOLITION PLAN - ACTIVE ASH
BASIN
P"=com ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
;EAL SCALE: AS SHOWN DES: ANR
`0 - DUKE
CA
DWG TYPE:. DWG DFTR: AMC
JOB NO: 60603204 CHKD: JDM
2 . ENERGY®
SEAL y:'y DATE: 12-12-19 ENGR: JDM
043997 1=
=R+ FILENAME: ALN C999.001.022-023 DEMOLITION PLAN.DWG APPD: JDM
�:, Q •' M Se-_ DWG SIZE DRAWING NO. REVISION
i
rliKlO`'````\\ ANSI D
12'rz�jq 22.0"x34.0" ALN C999.001 .023 A
9 10
1 1

mv• A
Ili \,• i/�> ,\- -- ,\ \. \ / \' \ L
111 \ \�1 II ��/ I \11 \\\ \\\ `\\ I \ \ \ \\ \ `\ 0
IN \ \\\ 0 1
�� ALLEN STEAM STATION \��
\
.. / J `-_ �� --' / / /� 1 � ��ii/' ��� \\ ` `i '-\1 \��'' /�' `- \-1 N�//III•-! ���I LI [�� ~� '�\ `-.�1
IM
1/11
RD
r� - _- l j \ \ �, I\ / COAL YARD
� �
/ \ I i i 1 \\ i/- I- /-T /-,_ \`\ 1\1 \�', \�\ \ III r•� `_-> �� l lrl� II \\�\, y1� I 1 / � / , LINE 1 A606 (100kV) D
\\
(TO BE RELOCATED
,1 ~5HOLDING�\ o\rI
BASINBY DUKE) O 'RAB NORTH
\�\
— —-625__I'�`----- STORMWATER DITCH
�\ \
\� 600`\\ \ \ _= ``�� _= =-rH I I PROPOSED CULVERT UNDER
\ \ 1` �_ r/r� RAILROAD SIZE TBD
co C.0
6Lo
2g�;��� ` ` ` \� \ / ��/ I CONCEPTUAL DAM BREACH GRADING
\- \ \\ \ \ \ \ \ \ , \ RETIRED ASH BASIN DIKE I
_-O o _--_\ \\ \\\\ \ \\\ \ \ \ 1 \\\ �i `\\ (GASTO-016) . _ �\ (SEE NOTE 1.3 IN GENERAL NOTES,
\ / I I / \ \\ 1\ 1 \ \ �\ �� _� / l -- - IJ DRAWING NO. ALN_C999.001.002)
/ / I / / 1 `-- \ 1\ \\ /600=-= ��
I- 0
POTENTIAL r f/I wl.,_I — \� — — — — — LAKE WYLIE/
° Lu SWITCHYARD i/ - / 00 p "��, ` `���_- - r CATAWBA RIVER
l LOCATION it \I l /O w ,// �V `\�\\`,� / \ ,- — — — \ o.i
NORMAL W.S.E. 565.7 FT.
i (PROVIDED BY DUKE) I 1 �- Q--' �0 1 \�__-- _---- - , p,
'O ������ \`\ I li?iii IIIIIIII FUTURE STORMWATER
UiIlI MANAGEMENT AREA
iIII O w f
.'' ---===---_1
I 1 IfI 1 IffIIII lII IIllIIIIIIIilII1fI I I liIIl IIIIIiIIII III1fII
IIIfI
I
I
I
LAKE WYLIETL 5N5 (500kV) ' _---------- - -- l 100-YEAR FLOOD(TO BE RELOCATED 7� ELEVATION: 571.3 FT.BY DUKE) Wl Iaw�RETIRED ASH BASIN LANDFILL (TO REMAIN)
1 TL 2A10 230kV
ASH LANDFILL PERMIT NO. 36-12 I IIIII Iffl III
TO BE RELOCATED - TL 1A482 I .I' JI l IIII Ii(I '!i11'!l
I 1 ( / . ---_ - . �`\ - I I I l l IIII 11 lI N !O
600 BY DUKE) ��; ;- - f — -� - '---- (100kV) I IIIII y It �� fll�lcollcnll I I MODIFIED
RAB LANDFILL SLOPE Iii1 I / IIII I Ili iu111i i STORMWATER
r I I I I IIIII STABILIZATION FEATURE
�IIIII / IIIII III Ij11111 MANAGEMENT AREA
\ 11 II I II _ I I I
�
--� \\\\\jam -- ��\ �`�__ --- i iIIIII I11 ,\►�� lili� riI �I11I ! EMERGENCY
\\ \\\1\ -%.- ��� '� -`\\ \�'r'i I I I Ilfi/fL — — — — — — — _ _ _ _ - \j'` - J I� i III I IIII SPILLWAY
IN
-----_ - -
Illl If I
LIJ- _ W
SOUTH `---LLU ---------IIII IIII PERMITTED SPILLWAY
STORMWATER DITCH \\ \\ ---- �;��_ ------ ,\ - — � ,., - `' �\ - _-_ ____�= 4ii1 r 1
NPDES
625
'ri OUTFALL
\\ \ _-_— SWO15
� / `O 1 \\\ , 1\ // 1 � J— �/,��� ____-- _'6OO IIIfl1Illii IuI1 111
COAL YARD SUMP
J % \ _ III IIIIIIIII I III DISCHARGE
n I • �- III IIII II II II IIII
I `�_ \ _ I II Iillilli i�illli i I (ABANDONED)
AAB NORTH ®� ®� I11111111 II�I� ICI
I \ 'STORMWATER DITCH J / ®€ Iiiiiliil iifll Ili AREA TO BE BACKFILLED
I ®€ III I III III I III AFTER REMOVAL OF CCR
TL 1A482 (100kV) o!�I!11!� i;Lo 11
(TO BE RELOCATED I 0 NI �N I�of
BY DUKE 11..�1; Ico �Icol II
) i11i1f1�i iillli II AAB EAST
/ cr III IIII I I. STORMWATER DITCH
_ _ �// /� � III IIIIIIIIIIIfII I I I� I
° -' � / � _\illllllllll IIII ICI Ill �.
CHEMICAL \ylliiillllliilli iilll
\ --- /-- BUILDING I I II IIII III III II
- (REMOVED) I Iiillifi„iilll llilill
13
'' \IliilliliIIIII iiil�ii I LAKE WYLIE/
l I , I I 111111 II fl II
TL 1A606 �- - \ I\IIII III Illllll
CATAWBA RIVER
- (100kV) ] 1 \ �Ilillii iilll iillll I NORMAL W.S.E.
CONCEPTUAL LANDFILL OI 'lll!II�II!I! Illlll I 565.7 FT.
\ \ 5\ FOOTPRINT/GRADING (SEE c00 IIII w o llilll
TL 5N5 \� \ NOTE 1.2 IN GENERAL NOTES, II Y
I IIII 0 c\I I10
I (500kV) > DRAWING NO ALN_C999.001.002) IIII Ifr� !
1 h � 1 I 1 I
M C.0 I lI<<
TL 2A10 W IIIIII �
CJ) f 1
, "IIII FUTURE STORMWATER
(230kV) Illllll. li IIII 1 MANAGEMENT AREA
` ► 1 I I I / 11\ r� -�___ Illl11! I lf1 I \
LAKE WYLIE 100-YEAR FLOOD
ELEVATION: 571.3 FT.
-i AREA TO BE BACKFILLED - 'AAB WEST i1 I Iilll \` \� \ JURISDICTIONAL STREAM
AFTER REMOVAL OF CCR'-"-STORMWATER DITCH \�
----- -- �/ I illlil \I\I\
\
w w k J 1 600
r625-1Illll1
17
l O -j
l / // �' O Iil1i111 ililiil I CONCEPTUAL DAM BREACH GRADING
SEE NOTE 1.3 IN GENERAL NOTES,
/ l : •-"_ `�= --^ � _ '`- �\ �__ I Ifflllll IIIII IIIIII
DRAWING NO. ALN C999.001.002
)
1 1 c //i�y J � � •'� � I \ \ \\ \ \\ � jlllrl / �
AAB SOUTH
STORMWATER DITCH _ - 6 `\ ' 1/--_-_--_-___�_�- ,'/i / 1 \ \ NPDES OUTFACE 002
`� ' j/ � �/ \� PERMITTED SPILLWAY
EXISTING
WTS PAD
-� p CHEMICAL 1 /
/ BUILDING
CP
60 i / / 6,
0 i �, , (REMOVED) ,
/ \ I \ o \� ��
6't , ,I , , \ \ \ / , -625 ,%--- l / Y\ /
/ //-- / AAB SOUTH
\\ \ \ O \\ \\ `\ `\ ) ► \\ ' I / STORMWATER DITCH '\
JURISDICTIONAL STREAM
ALN C999.001.024
LEGEND
625
PROPOSED MAJOR CONTOUR (25 FOOT)
PROPOSED MINOR CONTOUR (5 FOOT)
- - 62E
EXISTING MAJOR CONTOUR (25 FOOT)
EXISTING MINOR CONTOUR (5 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
LL
LIMITS OF EXISTING RAB LANDFILL LINER
APPROXIMATE ASH BASIN WASTE BOUNDARY
LIMITS OF WATER
100-YR
100 YR FLOOD LINE
HATCH LEGEND
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
PROPOSED AAB LANDFILL LOCATION
FUTURE STORMWATER MANAGEMENT AREA
POTENTIAL SWITCHYARD LOCATION
PROPOSED RAB LANDFILL SLOPE STABILIZATION FEATURE
EXISTING RAB LANDFILL
A 1f-%Trn
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2. REFER TO SHEET ALN_C999.001.002 FOR REFERENCES.
3. POTENTIAL HABITAT FOR SCHWEINITZ'S SUNFLOWER WAS IDENTIFIED BY AMEC'S JUNE
24, 2015 NATURAL RESOURCES TECHNICAL REPORT. PRIOR TO LAND DISTURBANCE,
THE U.S. FISH AND WILDLIFE SERVICE MAY REQUIRE A BIOLOGICAL SURVEY OF THESE
AREAS.
4. POTENTIAL JURISDICTIONAL WATERS (STREAMS/WETLANDS) WERE IDENTIFIED BY
AMEC'S JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT AND SURVEYED BY
MCKIM & CREED IN FEBRUARY 2016. CONFIRMATION IS PENDING U.S. ARMY CORPS OF
ENGINEERS REVIEW.
5. WORK WITHIN THE 100-YEAR FLOODPLAIN ALONG THE SHORELINE OF THE CATAWBA
RIVER MAY REQUIRE PERMITTING.
6. THE INTENT IN BREACHING THE RAB AND AAB DIKES IS TO REMOVE THE DIKES FROM
REGULATION AS DAMS. THIS WILL BE ACCOMPLISHED BY PERFORMING A FULL LOCAL
BREACH, I.E. TO REMOVE A PORTION OF THE DIKE COMPLETELY DOWN TO NATIVE
GROUND AT ITS LOWEST POINT SUCH THAT THE DIKE WILL NOT IMPOUND WATER OR
CCR MATERIAL. A SEPARATE NEW BERM WILL BE BUILT AROUND THE FUTURE
STORMWATER MANAGEMENT AREA FOR LONG-TERM STORMWATER MANAGEMENT.
7. THE PROPOSED GRADES SHOWN FOR THE STORMWATER DITCHES ARE CONCEPTUAL
AND WILL BE FURTHER DEFINED ON THE BASIS OF FUTURE DETAILED DESIGN AND
SUBSURFACE INVESTIGATION.
0 300 600 900
NOT FOR CONSTRUCTION
GRAPHIC SCALE (IN FEET)
TITLE
FINAL CLOSURE GRADING PLAN
P"=com
N.C. ENGINEERING LICENSE NO.
F-0342
SEAL
S6.4 L
= �• 0439g7
,lii 114tt\\
12�rz �19
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
FOR
ISSUED
FOR
APPROVAL
DUKE
ENERGY®
SCALE: AS SHOWN
DES:
ANR
DWG TYPE :. DWG
DFTR :
AMC
JOB NO: 60603204
CHKD:
JDM
[DATE: 12-12-19
ENGR:
JDM
FILENAME:
ALN_C999.001.024
FINAL
GRADING PLAN.DWG
APPD:
JDM
DWG SIZE DRAWING NO. REVISION
ANSI 22.0"x34.0" ALN C999.001.024
— A
1 10
1
z
0
•
INCHES 1 2 3 TENTHS 10 20 30

ALN C999.001.025 mv. A
LEGEND
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_ OE /L, // ii''/ \�C e+ `--\`- -` / /__'-_ i> 1 l 1 //� \�� ' 1 I \\\ \\ ` 11 \�1� �\
G� / I
�� ----__
0E i— _\ -5 \-•
OE 7 - TL 1A606 (100kV) / / / '" \�`\ \ -- " /;' /i/
(TO BE RELOCATED ;4 /w�- OE �� \t //
/ \ - - - / ` ` ` \ J , �� /' _ \ \ �/ / — / /� \\ r �` /ll II I �— _
BY DUKE) / r .O /, . \ ► / / �� �, / // I�-�-,\�� 1
/ '----, r - -- --- p J act=-'L _�_- ! N Rp ,' /, lei
- _---- - PLANT ALLEN '�—
-► ' COALYARD i , I \\\� O I``� V' 1\
�/ L111
-- ?./// / lI�lll/l I LINED HOLDING O
__ -___ ♦ / __- l l / III 11 I
SURFACE WATER �/ w _ ' \\ - -\\`-,ter \\\ \ -'' % ^' ,j.`\ \\ \ i \ \ 1\ / -, I / l l /Il/ I r 1 I
RUNOFF DITCH w O� - J / \ \ \ \ / \ ( �� 2//✓/9ti�, �� I / / 1/ 4 II I 1 BASIN \\
�/N \ / / \ \
/ // 1 I 1T\\ \ `� �� 1 /' --� --- -- ---------'-- Op/!\\`\\ �\__ _�,/ \�� \\ ` 1, I\ \ d ��0j IIIII / ®' ` \\ I I
_ _1 I I \\
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—/ t \ / i - -_---625-- \\\ \ ( \\ \ \ \ / / I I CD / 1 i \� ;
DOE �— 0E - O \\ \\\\\ 1 1^IIlr♦ / rJjl 1 11r \\
//--�- -- -- ��\\ \
// \ /------- - - - - - - .`<
I I I 1 j I (-v^ IrGJ — — — �_�\` ``\ `\\ \``�__ / \\��\\S\ �I \\ 6O �� r-�_l \o/'\---�-----'�'-`-- T%r
/ / \ \ \ \ SURFACE WATER
RUNOFF DITCH `\ \L\ \\ \ \ ------------- —�-------/'
wood
/ POTENTIAL SWITCHYARD -- -- ------ _-_-_-
_LOCATION �
(PROVIDED BY DUKE) / \� `� `\__ \ \ 1\ \ , \\Ld
625
----625-
PROPOSED MAJOR CONTOUR (25 FOOT)
PROPOSED MINOR CONTOUR (5 FOOT)
EXISTING MAJOR CONTOUR (25 FOOT)
EXISTING MINOR CONTOUR (5 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
LL LIMITS OF EXISTING RAB LANDFILL LINER
\� APPROXIMATE ASH BASIN WASTE BOUNDARY
I
�•COMMONS, ••COMMONER, LIMITS OF WATER
I
�I 100-YR 100 YR FLOOD LINE
FUTURE STORMWATER
MANAGEMENT AREA
l 1 I \ w \` ' O ,I O p 1\\�\` I LAKE WYLIE/
I b /- - - - - - - I
/ / \ /
1 / r / / / r. � y1�j i I CATAWBA RIVER
____-� ____-�\ "\ T� '' .'' I1 NORMAL W.S.E. 565.7 FT.
w 00 O wi' /�literI1III1III I1II II1II lI1II lI1 II
I/I 1II�lIII'1I1 116 �II 1111IIIII 1I cIOOIIIIlIII I IIII
I
I CONCEPTUAL DAM BREACH
S GRADING (SEE NOTE 1.3 IN
SiGENERAL NOTES, DRAWING
O
NO. ALN_C999.001.002)
I 1 O w -- / l 'r `-- \` --- \--- \ / \ \ i-r -�� - — — --- - __ 1 II 11' 11''
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_-----\-------'" -' (TO BE RELOCATED 1 _ _ i i i i I `---- - --\ --�1 I I------� \\�� _ _ - - - -_ _--------------------- r 111 I� 111' I 1
___ , , I r----------------------/ r--\ _-_-_-_ — __ 1 I I I I I I I I I I I I L J �' w — — — IIII 1 I 1 r r- 1 - — — — — — — — — -_- ------ ___ i ---- _- ------ -__--I I I I II I I 1 I I 1 1 I OI
- _ BY DUKE . , 1 I 1 1 I --_-----_- _ _ _ _� `� _ _ _ 1 1 I I II IIIII 11
Q-- _----- \
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-- �/ \ O fp III I I I \ 1/ I I - 1 1 1 l l l l l 1 1 I I '
--- ' —► / O \ I 1 1 I I I / I I I 11 II I II
--- ---' w /� \- III , IIII ` — — / �I / 1 Jill I �I I I I III
------- I
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`---'' Now
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-- 62� —� __ — — — —' /♦ /^ i I I j - --__ --- / / ' �\\`��`\� IIII IIII !11 " r/ lam^ 'l 1' 1 1 �I I" 111 I I
r ''' i'' `\ 1\ j i - w w _- 1dj //� \`\� `\+ _-- ------
Idl . TL 1 A482 I I 1 0 1I 1
60p - ----'' TL 2A10 (230kV) .r _-o-� / • III IIII I l I I I 1111 I'N I I O I I II
W ' _ -- ,l I I I I I I I I I I I ( I 11 1 1 111 C I I
TO BE RELOCATED' - CJ ____. (10okV) III I 1 I I I I "i VI II 1 / I'I ro CO' 1
�\ \ ( O— — �� i i 1 i RETIRED ASH BASIN LANDFILL (TO REMAIN)
600 BY DUKE) I I I I I I; 1 1 ASH LANDFILL PERMIT NO.36-12
1 ---------
1,
w \\`L\\ 1 J---�� \_a- _- \ \\\\♦� �� \_ �� _'ti — =—�--- \\\`\\ \���\�\ ���__�_--� -�---'-i------ —�/- -- _ \ \\�`�1 \ __ �'r-l'-==-•-,1',1 II
� II I I
-_---------- IIIIIIIIIIIII I1 IIII
-
SURFACE WATER ------- ---------=-
I1I;1II1l1I
I'
1
II1I
RUN-O_F-F-DITCH
-_- __-i_ ----_---------_------_-__
1 11 111- -- _------------'_--------_ �---_ -------------
I
--- \\ 1 \ \ I 1 \\\\ t \\♦\\ \ `\ `\ `\\\\\�o --'>-' - // � _ ____iIv ' -_`\ \ \\\\\\ \D \``'''---- � — — — _—__— — — _
___--_-_-_------------- III III / _____-__--
\I`I - w
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--_ - ----______J- __O \r---- so_ ---------- - - -
-- - - _ - I I IIIIIIIIIIIPROPOSED RAB
---- ,-------�\LANDFILL SLOPE III /1IIII1III; II1 II II I1IrI1�
to STABILIZATION \\ ,' •:iil /// /
C4FEATURE
------ ----------- /
. .� AAB NORTH DIKE - -___ - - i 1\\\\ 111I 1 IIIII / 1/ /I
.Lri _ \\\\II II111 111 1 //1
SURFACE WATER
1 \ / RUNOFF DITCH
l� \✓� \\ `\— � � \ -- � �` I i II I Iii;ili;i Iiiiii r;i � I I 1
-----_Jill
__-__��BF
I1I1I 111 II11 I 111I
100-YEAR
FLOOD
ELEVATION:
571.3 FT.
MODIFIED STORMWATER
MANAGEMENT AREA
EMERGENCY SPILLWAY
PERMITTED SPILLWAY
NPDES
OUTFALL
SWO15
COAL YARD SUMP
DISCHARGE
1 - - - - - - _ l `-8 I 1111111( I l l i I i i (ABANDONED)
l I O Jl AFTER REMOVAL OF CCR
CD�1jIII;� I11ili ��III
1
TL 1A482 (10OkV) o; I Lin 11 111 N 1 1 0olcoll
I
(TO BE RELOCATED I iIi' i i 11I I11 i 1 i I�i SURFACE WATER
r050 I BY DUKE) 11;I;IIII 11�1 I 111111 I
�5r � -ter -- � ,� , RUNOFF DITCH
ON �_� ._ / I 'I'I Ill 'IIII I I' I I
i1liii
lllll li I i
Ill 11
O ;;iIi ' 1111
rt _ ,\ 1 i.i�il.li.. ill Il, l�l I�
INCHES 1 2 3 ITENTHS 10
HATCH LEGEND
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
PROPOSED AAB LANDFILL LOCATION
FUTURE STORMWATER MANAGEMENT AREA
POTENTIAL SWITCHYARD LOCATION
PROPOSED RAB LANDFILL SLOPE STABILIZATION FEATURE
EXISTING RAB LANDFILL
KInTPC
1.
LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2.
REFER TO SHEET ALN_C999.001.002 FOR REFERENCES.
3.
POTENTIAL HABITAT FOR SCHWEINITZ'S SUNFLOWER WAS IDENTIFIED BY AMEC'S JUNE
24, 2015 NATURAL RESOURCES TECHNICAL REPORT. PRIOR TO LAND DISTURBANCE,
THE U.S. FISH AND WILDLIFE SERVICE MAY REQUIRE A BIOLOGICAL SURVEY OF THESE
AREAS.
4.
POTENTIAL JURISDICTIONAL WATERS (STREAMS/WETLANDS) WERE IDENTIFIED BY
AMEC'S JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT AND SURVEYED BY
MCKIM & CREED IN FEBRUARY 2016. CONFIRMATION IS PENDING U.S. ARMY CORPS OF
ENGINEERS REVIEW.
N
5.
WORK WITHIN THE 100-YEAR FLOODPLAIN ALONG THE SHORELINE OF THE CATAWBA
RIVER MAY REQUIRE PERMITTING.
0 300 600 900
NOT FOR CONSTRUCTION
GRAPHIC SCALE (IN FEET)
TITLE
FINAL CLOSURE GRADING
PLAN -RETIRED ASH BASIN
P"=com ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
SEAL SCALE: AS SHOWN DES: ANR
\`\,,,Ill,frill,,,,/ D E
Cq,4ODWG TYPE:.DWG DFTR: AMC
O .• FEss� �� JOB NO: 60603204 CHKD: JDM
0._ �f ENERGY®
SEAL y; y - DATE: 12-12-19 ENGR: JDM
= 043997 ~ =
�q FILENAME: ALN_C999.001.025-026 FINAL GRADING PLAN.DWG APPD: JDM
Q 0 `�� DWG SIZE DRAWING NO. REVISION
ANSID
ALN C999.001 .025 A
9 10
1 1

-0_w 1��� ' ,,,11,1i 11,�ir i�Ii �„i'�1!jI!II'1'
—600 —___-- --- TL 2A10 (230kV) �_ TL 1A482 iI i i i i i 1 i 1 Iii 1 i ( I till i i ii INN 11 00 1 i II
ld — — Liw --- (100kV) IIII IIIIII I I I I I I I /III � 11'o I I
— (TO BE RELOCATED O — co - --_IIII (IIII RETIRED ASH BASIN LANDFILL (TO REMAIN) I I I ial II I l i III ,I11 I II II I p
---600 BY DUKE) --- r 1 i i i i i 1 i 1 ASH LANDFILL PERMIT NO. 36-12 11 i 1 i 1► 11 1 iii i11 i i 1 i i
' \ —'IIII (IIII 11111 i I III II I I I I I MODIFIED STORMWATER
!!!--62 I I III IIII 11 I
I- I �` "IIII I I L— I IIIII ri I Ill
i I I i I I i I MANAGEMENT AREA
\ \ III
\__ � � • `\ _ � r �--- — -- IIII IIII 11 I I � �� �I I I I III I I j I I I I
_ -- L,JL�IIIIIII 11I I1 \`- "') 11 1ill I I IIIIII
---- _---- // /III IIIIII J11 1 ; 11 I
SURFACE WATER
`
RUNOFF DITC\—H
--_------_--- ------ --_ — ---_— —_— --_—_--_—_--_—_—_--_—_�'�/L—— — — — —-
i —
w --__
—_---— __------- / iI,1i IIiIII iIIiIIIIIwIiII1III'1IIiIII1II'1III
II(IIII'II1III
/
I�
EMERGENCY SPILLWAY
_— _
o LILIbi
-______________N PROPOSED RAB �:x
___ ---------
_ ` \ --LANDFILL SLOPE — — — — — "----
9) STABILIZATION '------ \\ ;.''%/ /i/// //
---------- I i N �.
III p FEATURE `I -- , —-_%�/ r PERMITTED SPILLWAY
600
GO
—_
62
<' `so _ `O� '^ X Imo- .AAB NORTH DIKE
It'll I I IIII
\ \ . \ '/ _ — X // __'/—�/ _-- — _ — 1 I► 1111 11 \ NPDES
SURFACE WATER
11II II II 1I1I111 '1 I1'1I 'I � IIII \�I/ OUTFALL
RUNOFF DITCH SWO15
I I I I I I
I I
If 1 1 1 IIII I I
gE
I' i' i 11 I I' I' I 1 iiII 1
I - - i 1i1i11i1� IIIIII I I I I I COAL YARD SUMP
® Iiiiililllii111 IIII i DISCHARGE
18 I III IIII i 1111 I 1 (ABANDONED)
oo III' II 11 I I
0 I� �'� O l I i 1 i 11 i i l 11 i 1 i iiII (' AREA TO BE BACKFILLED
J I AFTER REMOVAL OF CCR
I (IIIIIII; IIIII I I I
O I li 111,Ii 11' 1
TL 1A482 (100kV) I Iim11 1j11 1C i i I
(TO BE RELOCATED I I I I. 1 1
BY DUKE ' i' i' 1 s I' 1 i I i i i i l l l I SURFACE WATER
650 I� ) IIII IIII + IIII I 1 1 1 1 1 1 I i RUNOFF DITCH
-- ----- .-- /f i 1 i 111 II I1 11 1 1 1 11' I I
Ill
ilillIll �iii11 II�II� 11Ig
11
O r/ \ \IIIIII IIII I I 1 1 1 1 1 1 4 11
`' I III' I jJill ill 1 1 1 I/
�� �/ --''� � �� �I1111111 jIIl11 ii1j111 II
I111111i11j1111 iill�li 11
/ ° \Ji1i111iI11'i1i IIIIIII
/ TL 1A606 (100kV) \
/ LAKE WYLI E/
/ ------- TL 5N5 (500kV) \ 111 I I IIII I I 1 1 1 1 1
\ I 1\I1111111 jliii ill if
CATAWBA NORMAL
- \ \ \\ IIII I IIIII' 111 IIII if 11 565.7 FT.
\\ \� CONCEPTUAL LANDFILL 'IIIII! �I!ili IIIIII
O I— I 11 I I I I
I O ` `,\� FOOTPRINT/GRADING (SEE 1 1 ''
\ _\ O
/ NOTE 1.2 IN GENERAL NOTES, I' I 1
1 1 I I if
CHEMICAL I DRAWING NO ALN C999.001.002 ) w i 111' ' 1 ! 1 1 11
I I I I I I Y co
BUILDING 1 ,� ��
\ 1 1 1 1 1 ►\ \ (REMOVED) 1 0IIIII LJ°
w Cfl l
O ''' < <
TL 2A10 .\ O I i IIII w
I II I\ II 11 I II i/ /'^�\ \`\ i • \ (230kV) \``• I—
I
1 1 1 1 I,
I 1 r -I ► ` 1 1
\ 1\
\
---. \\ \i I I I' i i \� \`\\`\ •'^'`\�- -- — ' I i 1 I I i' I' i I i i' i II \\•\Q,\
ill I III I IIII IIIII FUTURE STORMWATER MANAGEMENT
,I ► 1 �l 1 �\ AREA TO BE BACKFILLED - �. i I i i' AREA
--- / ;III111111'I IIIII _II` \�
AFTER REMOVAL OF CCR ____---- I 111 I I 11 I I 1 1 / 1 11
I \
-- _,, ,;, 11111111111 1,11, � \_.�•'
/ _---- --- - I' 1 I' '' 1 I 1 1 1' I 1 i I `�I \ GRADING CONCEPTUAL DAM BREACH
/^I' 1 I I I
(
!IIIIII �� GENERAL NOTES, DRAWING
IFl / ��� \ 1 'Ic0 NO. ALN C999.001.002
o O 0 1-,)W
11
cNi ., IIt
`
Ld
00,
O O O O ww 111 1
i/ / / � O 100-YEAR FLOOD
/ \L I 25, i 1 i I 1 I i I ELEVATION: 571.3 FT.
/ i'Ii� IIII' ''111'II '
SURFACE WATER Ld O Ow w w I I 1 i i 1111 ' PERMITTED SPILLWAY
I ' - RUNOFF DITCH O 00 11111111 I 11
<l '/%%/ r_ \ ��'� �_��G� — — \ `� ` /•�� '� ' ` t— �\ `\ \\ ` j'Ij 111 #I =:FI NPDES
I OUTFACE 002
/
/iii _�—~`__.— —\ I `_—,' � � \ � � � � — _=_ :::5
\ \ / r' -- f3-- ► I\ I - EXISTING
�/� �,''� _-- �/��,/ ,� ' ,' WTS PAD
/' /CHEMICAL ' JURISDICTIONAL STREAM
' -'Q'-O -----''�' ' / BUILDING
-0� 'O' O I (REMOVED)
oj fol q co \ SURFACE WATER
RUNOFF DITCH
N It
It
44j wool
625
ALN C999.001.026 wv. A
LEGEND
PROPOSED MAJOR CONTOUR (25 FOOT)
PROPOSED MINOR CONTOUR (5 FOOT)
EXISTING MAJOR CONTOUR (25 FOOT)
EXISTING MINOR CONTOUR (5 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
LL LIMITS OF EXISTING RAB LANDFILL LINER
APPROXIMATE ASH BASIN WASTE BOUNDARY
• LIMITS OF WATER
100—YR100 YR FLOOD LINE
HATCH LEGEND
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
PROPOSED AAB LANDFILL LOCATION
r— —1 FUTURE STORMWATER MANAGEMENT AREA
POTENTIAL SWITCHYARD LOCATION
PROPOSED DMM SLOPE STABILIZATION
EXISTING RAB LANDFILL
KinTP:c
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2. REFER TO SHEET ALN_C999.001.002 FOR REFERENCES.
3. POTENTIAL HABITAT FOR SCHWEINITZ'S SUNFLOWER WAS IDENTIFIED BY AMEC'S JUNE
24, 2015 NATURAL RESOURCES TECHNICAL REPORT. PRIOR TO LAND DISTURBANCE,
THE U.S. FISH AND WILDLIFE SERVICE MAY REQUIRE A BIOLOGICAL SURVEY OF THESE
AREAS.
4. POTENTIAL JURISDICTIONAL WATERS (STREAMS/WETLANDS) WERE IDENTIFIED BY
AMEC'S JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT AND SURVEYED BY
MCKIM & CREED IN FEBRUARY 2016. CONFIRMATION IS PENDING U.S. ARMY CORPS OF
ENGINEERS REVIEW.
5. WORK WITHIN THE 100-YEAR FLOODPLAIN ALONG THE SHORELINE OF THE CATAWBA
RIVER MAY REQUIRE PERMITTING.
6. THE INTENT IN BREACHING THE RAB AND AAB DIKES IS TO REMOVE THE DIKES FROM
REGULATION AS DAMS. THIS WILL BE ACCOMPLISHED BY PERFORMING A FULL LOCAL
BREACH, I.E. TO REMOVE A PORTION OF THE DIKE COMPLETELY DOWN TO NATIVE
GROUND AT ITS LOWEST POINT SO THAT THE DIKE WILL NOT IMPOUND WATER OR CCR
MATERIAL. A SEPARATE NEW BERM WILL BE BUILT FOR LONG-TERM STORMWATER
MANAGEMENT.
0 300 600 900
NOT FOR CONSTRUCTION
GRAPHIC SCALE (IN FEET)
TITLE
A=COM
SEAL
N.C. ENGINEERING LICENSE NO.
F-0342
\A CA
O .QFES's `�
2'.� SEAL y•, 2
c- 043997
fitr tC\O\\\\```•
M/12 �iq
FINAL CLOSURE GRADING
PLAN -ACTIVE ASH BASIN
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS — CBE
GASTON COUNTY, NORTH CAROLINA
FOR ISSUED FOR APPROVAL
DUKE
ENERGY®
SCALE: AS SHOWN
DES: ANR
DWG TYPE:. DWG
DFTR: AMC
CHKD: JDM
DATE: 12-12-19
ENGR: JDM
FILENAME: ALN-C999.001.025-026 FINAL GRADING PLAN.DWG
APPD: JDM
DWG SIZE
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4 �
RETIRED ASH BASIN DIKE
(GASTO-016)
CONCEPTUAL DAM BREACH GRADING
(SEE NOTE 1.3 IN GENERAL NOTES,
DRAWING NO. ALN_C999.001.002)
PROPOSED DETENTION BASIN
1-30" CULVERT OUTLET. INLET ELEVATION 565.0 FT.
EMERGENCY SPILLWAY ELEVATION 579 FT.
LAKE WYLIE/
CATAWBA RIVER
NORMAL W.S.E. 565.7 FT.
100-YEAR
FLOOD
ELEVATION:
571.3 FT.
PROPOSED DETENTION BASIN
1-18" CULVERT OUTLET. INLET ELEVATION 615.0'
EMERGENCY
SPILLWAY
ALN C999.001 .027
LEGEND
625
PROPOSED MAJOR CONTOUR (25 FOOT)
PROPOSED MINOR CONTOUR (5 FOOT)
- - 62-
EXISTING MAJOR CONTOUR (25 FOOT)
EXISTING MINOR CONTOUR (5 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
LL
LIMITS OF EXISTING RAB LANDFILL LINER
APPROXIMATE ASH BASIN WASTE BOUNDARY
LIMITS OF WATER
100-YR
100 YR FLOOD LINE
STORMWATER FLOW DIRECTION
HATCH LEGEND
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
PROPOSED DETENTION BASIN
POTENTIAL SWITCHYARD LOCATION
PERMITTED SPILLWAY
NOTES
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
NPDES 2. REFER TO SHEET ALN C999.001.002 FOR REFERENCES.
OUTFALL -
SW015 3. POTENTIAL HABITAT FOR SCHWEINITZ'S SUNFLOWER WAS IDENTIFIED BY AMEC'S JUNE
24, 2015 NATURAL RESOURCES TECHNICAL REPORT. PRIOR TO LAND DISTURBANCE,
THE U.S. FISH AND WILDLIFE SERVICE MAY REQUIRE A BIOLOGICAL SURVEY OF THESE
COAL YARD SUMP AREAS.
DISCHARGE (ABANDONED) 4. POTENTIAL JURISDICTIONAL WATERS (STREAMS/WETLANDS) WERE IDENTIFIED BY
AMEC'S JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT AND SURVEYED BY
MCKIM & CREED IN FEBRUARY 2016. CONFIRMATION IS PENDING U.S. ARMY CORPS OF
ENGINEERS REVIEW.
5. WORK WITHIN THE 100-YEAR FLOODPLAIN ALONG THE SHORELINE OF THE CATAWBA
RIVER MAY REQUIRE PERMITTING.
6. EXISTING TRUCK WASH AND SCALES TO THE NORTH OF ASH FILL 1 MAY NOT BE
LOCATED WITHIN THE ASH BASIN LIMITS SHOWN ON THE DRAWINGS. THIS WILL NEED
TO BE VERIFIED PRIOR TO CONSTRUCTION.
7. THE INTENT IN BREACHING THE RAB AND AAB DIKES IS TO REMOVE THE DIKES FROM
REGULATION AS DAMS. THIS WILL BE ACCOMPLISHED BY PERFORMING A FULL LOCAL
BREACH, I.E. TO REMOVE A PORTION OF THE DIKE COMPLETELY DOWN TO NATIVE
GROUND AT ITS LOWEST POINT SUCH THAT THE DIKE WILL NOT IMPOUND WATER OR
PROPOSED DETENTION BASIN CCR MATERIAL. A SEPARATE NEW BERM WILL BE BUILT AROUND THE FUTURE
2-20" CULVERT OUTLETS. INLET ELEVATION 565.0 FT. �T STORMWATER MANAGEMENT AREA FOR LONG-TERM STORMWATER TREATMENT.
EMERGENCY SPILLWAY ELEVATION 580 FT.
CONCEPTUAL DAM BREACH GRADING
(SEE NOTE 1.3 IN GENERAL NOTES,
DRAWING NO. ALN_C999.001.002)
JURISDICTIONAL STREAM
0 300 600 900
LAKE WYLIE LAKE WYLIE/
100-YEAR CATAWBA RIVER NOT FOR CONSTRUCTION
FLOOD NORMAL W.S.E. GRAPHIC SCALE (IN FEET)
ELEVATION: 565.7 FT.
571.3 FT. TITLE
FINAL SURFACE WATER MANAGEMENT PLAN
NPDES
OUTFALL
002 I' ALLEN STEAM STATION
PERMITTED SPILLWAY CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR ISSUED FOR APPROVAL
JURISDICTIONAL STREAM F-0342
SEAL `,,,,IIII SCALE: AS SHOWN DES: ANR
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TENTHS 1 1 11
le
INVA
0 300 600 900
GRAPHIC SCALE (IN FEET)
LEGEND
625
PROPOSED MAJOR CONTOUR (25 FOOT)
620
PROPOSED MINOR CONTOUR (5 FOOT)
LIMITS OF EXISTING RAB LANDFILL LINER
LL
EXISTING MAJOR CONTOUR (25 FOOT)
EXISTING MINOR CONTOUR (5 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED
ASH/ LIMITS OF CLOSURE CAP
------------------
ASH STORAGE BOUNDARY
100—YR
100 YR FLOOD LINE
_--__--_-
PROPOSED UNPAVED ROADS
APPROXIMATE ASH BASIN WASTE BOUNDARY
A I t-N =7 0
1. RAB LANDFILL INTENDED TO BE IN OPERATION. FINAL GRADES NOT
SHOWN HERE.
2. TO IMPROVE CLARITY, ONLY 5-FOOT CONTOURS ARE SHOWN ON THIS
SHEET.
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
SECTION LAYOUT PLAN
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
LAKE WYLIE/CATAWBA
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO.
FOR ISSUED FOR APPROVAL
RIVER
NORMAL W.S.E. 565.7 FT
F-0342
SEAL
��
SCALE: AS SHOWN
DES: ANR
DWG TYPE:.DWG
DFTR: AMC
,,,,,,,t1t11111,,,,
\�,�N Cq�,o.,�'
DUKE
<
�:a.
ENERGY®
JOB NO: 60603204
CHKD: JDM
DATE: 12-12-19
ENGR: JDM
_ SEAL ti ;may
= : 043997 -
?
FILENAME: ALN_ C999,001,028-038 FINAL GRADING CROSS SECTIONS,DWG
APPD: JDM
DWG SIZE
DRAWING NO.
REVISION
Q ... .. 0�`\\�
i
K\O\\`
ANSI D
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12'rz�jq
22.0"x34.0"
ALN C999.001 .028
A
8 9 10
1 1 1
I
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ALN C999.001 .029
mv• A
700
A 6
A0/
670
:.K
650
640
630
620
610
mf
r0f
70
O
0
O
O O O O O O O O O O O O O O O O O O O O O 0 d-
O O O O O O O O 0 O O O O O O O O O O O O O 1l-
+ + + + + + + + + + + + + + + + + + + + + + +
N r� Ln c0 Il- 00 00 O N co 00 O O N N
N N N N
SECTION A -A'
700
5N5 (500kV) TRANSMISSION LINE SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET)
690
O
680 -
2A10 (230kV) TRANSMISSION LINE SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET) j
670
O
1A606 (100kV) TRANSMISSION LINE SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET)
660 - -
PRE -DECANTING GROUNDWATER LEVEL
(SEE: REFERENCE 4)
O
650 -I
/T RAB SOUTH STORMWATER CHANNEL EXISTING G ADE
640
630 ,1-
620 _
HI TORIC GFADE
rL RAB MAIN STORMWATER CHANNEL
610 _ - -
600 \
590
580
0 0 0 0 0 0 0 0 0 0 O O O O O O O O O o Ln
O O O O O O O O O O O O O O O O O O O O `t
N± N N-) to coo r- coo m N + N r+ i i c+o o+o 0) 0)
SECTION B-B'
INCHES 1 2 3 TENTHS 10 20 30
NOTES
1. BASIS OF BEARINGS: INC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
REFERENCES
1. HISTORICAL GRADES WERE DIGITIZED BY AMEC FOSTER WHEELER AS PART OF THE WASTE STRATEGY
ANALYSIS REPORT DATED APRIL 2015. VERTICAL DATUM CONVERTED FROM NGVD29 TO NAVD88 (DATUM
SHIFT OF -0.75 FEET WAS APPLIED).
2. EXISTING GRADES ARE BASED ON AERIAL TOPOGRAPHIC SURVEY PERFORMED BY WSP IN FEBRUARY 2015.
3. THE ASH BASIN EXTENTS PRESENTED IN THIS DRAWING ARE BASED ON THE "COMPREHENSIVE SITE
ASSESSMENT REPORT - ALLEN STEAM STATION ASH BASIN," PREPARED BY HDR FOR DUKE ENERGY AND
SUBMITTED TO NCDEQ (NPDES PERMIT NO. NC0004979) ON AUGUST 23, 2015.
4. WATER TABLE ELEVATIONS FOR PRE -DECANTING CONDITIONS WERE PROVIDED BY SYNTERRA IN 2019 ALONG
WITH THE BASIS AS FOLLOWS: SIMULATED STEADY-STATE GROUNDWATER HYDRAULIC HEADS FROM THE 2018
SYNTERRA GROUNDWATER MODEL. THIS FLOW MODEL WAS CALIBRATED TO TIME -AVERAGED HYDRAULIC
HEADS MEASURED IN MONITORING WELLS PRIOR TO THE START OF DECANTING. THE SIMULATED HYDRAULIC
HEADS ARE TAKEN FROM THE SAPROLITE OR TRANSITION ZONE MODEL LAYERS, AND ARE APPROXIMATELY
EQUAL TO THE WATER TABLE ELEVATIONS.
5. TRANSMISSION LINES SAG ELEVATIONS PROVIDED BY DUKE ENERGY AND SHALL HAVE THE FOLLOWING
VFRTICAI CI FARANCF FROM GRC)l1Nn Tn THE I C)WFST SAG FI FVATION-
100 KV
22 FT.
230 KV
24.5 FT.
500 KV
30.5 FT.
all
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KEY MAP
LEGEND
EXISTING GRADES
— — — — — — — — — —
HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
EXISTING RAB LANDFILL
I z
n
PROPOSED CLEAN FILL
C�
_
PROPOSED ASH FILL
PROPOSED SOIL BERM
O
_
PROPOSED DMM WALL
O
PRE -DECANTING GROUNDWATER
— — — -
PRE -DECANTING GROUNDWATER MODIFIED IN AUTOCAD
CROSS SECTION TO ACCOUNT FOR ARTIFACTS CAUSED BY
LIMITED RESOLUTION OF GRID SIZE/SPACING IN MODFLOW
3D
7
FREE WATER PRIOR TO DECANTING
—
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS I
P"=com ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
SEAL SCALE: AS SHOWN DES: ANR
0 15 30 45 `` ,-,N„CA /y ,'' � � DUKE
�� ��i � DWG TYPE:.DWG DFTR: AMC
U�• rrESs/• �<,,�JOB NO: 60603204 CHKD: JDM
VERTICAL SCALE (IN FEET)=¢O Z:� = _ ENr-rlfn'**%'®DATE: 12-12-19 ENGR: JDM
SEAL �.�=
043g97 FILENAME: ALN C999,001,028-038 FINAL GRADING CROSS SECTIONS,DWG APPD: JDM
0 150 300 450 i •. �, _
r/N�'• ���� DWG SIZE DRAWING NO. REVISION
HORIZONTAL SCALE (IN FEET) rriK\\��22.0'SI D.0"
12�rzj�� ALN C999.001 .029 A
8 9 10
1 1 1

.•.
•m
1A482 (100kV) TRANSMISSION LINE MAX. SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET)
ALN C999-001.030
FEv• A
670
PRE -DECANTING GROUNDWATER LEVEL
(SEE REFERENCE 4)
Im
650
T-I
f
.�E
630
620
610
600
590
580
570
I
560
O O O O O O O O O O O O O
O O O O O O O O O O O O o
+ N
O ± N r0 �t a0 O O
LEGEND
EXISTING GRADES
- - - - - - - - - - - -
- HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
EXISTING RAB LANDFILL
PROPOSED CLEAN FILL
_
PROPOSED ASH FILL
PROPOSED SOIL BERM
PROPOSED DMM WALL
PRE -DECANTING GROUNDWATER
- - -
PRE -DECANTING GROUNDWATER MODIFIED IN AUTOCAD
CROSS SECTION TO ACCOUNT FOR ARTIFACTS CAUSED BY
LIMITED RESOLUTION OF GRID SIZE/SPACING IN MODFLOW
3D
- n
FREE WATER PRIOR TO DECANTING
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
—F 2. THE INTENT IN BREACHING THE RAB AND AAB DIKES IS TO REMOVE THE DIKES FROM REGULATION AS
DAMS. THIS WILL BE ACCOMPLISHED BY PERFORMING A FULL LOCAL BREACH, I.E. TO REMOVE A PORTION
OF THE DIKE COMPLETELY DOWN TO NATIVE GROUND AT ITS LOWEST POINT SUCH THAT THE DIKE WILL
NOT IMPOUND WATER OR CCR MATERIAL. A SEPARATE NEW BERM WILL BE BUILT AROUND THE FUTURE
STORMWATER MANAGEMENT AREA FOR LONG TERM STORMWATER MANAGEMENT.
3. THESE PLANS DO NOT INCLUDE DAM BREACHING. SPECIFIC PLANS FOR THE WORK WILL BE SUBMITTED AT
A LATER DATE.
INCHES 1 2 3 TENTHS 10 20
EXISTING GRADE
I I I
AAB TO RAB STORMWATER CHANNEL
i
O O O O O O O O O
0 0 0 0 0 0 0 0 0
Cp I� tb O N r7
N N N N N
SECTION C-CI
REFERENCES
I I I I I I I
- HISTORIC GRADE
PROPOSED STORMWATER DETENTION
N
POND BERM (SPILLWAYS/CULVERTS
NOT SHOWN)
1
O O O o
O O O O
Ln O 00
N N N N
1. HISTORICAL GRADES WERE DIGITIZED BY AMEC FOSTER WHEELER AS PART OF THE WASTE STRATEGY
ANALYSIS REPORT DATED APRIL 2015. VERTICAL DATUM CONVERTED FROM NGVD29 TO NAVD88 (DATUM
SHIFT OF -0.75 FEET WAS APPLIED).
2. EXISTING GRADES ARE BASED ON AERIAL TOPOGRAPHIC SURVEY PERFORMED BY WSP IN FEBRUARY 2015.
3. THE ASH BASIN EXTENTS PRESENTED IN THIS DRAWING ARE BASED ON THE "COMPREHENSIVE SITE
ASSESSMENT REPORT - ALLEN STEAM STATION ASH BASIN," PREPARED BY HDR FOR DUKE ENERGY AND
SUBMITTED TO NCDEQ (NPDES PERMIT NO. NC0004979) ON AUGUST 23, 2015.
4. WATER TABLE ELEVATIONS FOR PRE -DECANTING CONDITIONS WERE PROVIDED BY SYNTERRA IN 2019 ALONG
WITH THE BASIS AS FOLLOWS: SIMULATED STEADY-STATE GROUNDWATER HYDRAULIC HEADS FROM THE 2018
SYNTERRA GROUNDWATER MODEL. THIS FLOW MODEL WAS CALIBRATED TO TIME -AVERAGED HYDRAULIC
HEADS MEASURED IN MONITORING WELLS PRIOR TO THE START OF DECANTING. THE SIMULATED HYDRAULIC
HEADS ARE TAKEN FROM THE SAPROLITE OR TRANSITION ZONE MODEL LAYERS, AND ARE APPROXIMATELY
EQUAL TO THE WATER TABLE ELEVATIONS.
5. TRANSMISSION LINES SAG ELEVATIONS PROVIDED BY DUKE ENERGY AND SHALL HAVE THE FOLLOWING
VERTICAL CLEARANCE FROM GROUND TO THE LOWEST SAG ELEVATION:
100 KV
22 FT.
230 KV
24.5 FT.
500 KV
30.5 FT.
J
100-YEAR FLOOD ELEVATION: 579.2'
25-YEAR FLOOD ELEVATION: 575.0'
NORMAL POND WSE 565.7' -
PROPOSED RAB STORMWATER
DETENTION POND
(DETAILED DESIGN TO BE PROVIDED
I
WITH CONSTRUCTION LEVEL DRAWINGS)
O O O O
O O O O
O
O
O O O O
O O O O
O
O
+ + +
+ + + + +
+
+
rn O N
r7 Lf) (D
r-
00
N V') V
V') V')
V')
V')
7_�
10
'i
,
-
gv,
-s'
, �
y,;ji
I I
-f � //�-. •.�_ �I
I
III /C//J /�/i /�
/// F"
IJ III / /11 '
RAB DIKE BREACH
(SEE NOTE 2)
1
r�\
O O
O O
O O O O O
cKil
O O
O O
O O O O O
CD
OUTLET CULVERT/CHANNEL
LAKE WYLIE WSE 565.7'
NOT FOR CONSTRUCTION
KEY MAP TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS II
A"=com ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
0 15 30 45
SEAL A SCALE: AS SHOWN DES: ANR
��`\•��1 C`,t�ttt1111Jlrrrrq�,o.,DUKE r DWG TYPE:. DWG DFTR: AMC
JOB ENFIV�Y® DATENO: 60602209 CHKD: JDM
ENGR: JDM
VERTICAL SCALE (IN FEET) ' �.:Q SEAL v:. y
=pp ; �043997'� k = FILENAME: ALN C999,001,028-038 FINAL GRADING CROSS SECTIONS,DWG APPD: JDM
0 150 300 450
b�`��� DWG SIZE DRAWING NO. REVISION
ANSI D
HORIZONTAL SCALE (IN FEET) �irlY�ttt,>>� ""
22.0x34..0
f2 f r2 j�q ALN C999 - 001 . 030 A
8 9 10
1 1 1

ALN C999■001■031
mv• A
.:.
670
..6
.0
. 'R
. U
.m
. ff
10
570
.6
550
540
O O O O O O O O O O O O O O O O O O O O O O O O O O
O O O O O O O O O O O O O O O O O O O O O O O O O O
+ + + + + + + + + + + + + + + + + + + + + + + + + +
N r7 in co r- 00 O O N n It Ln co r- 00 O O N I") `t Ln O
r r — N N N N N N N
REFERENCES
1. HISTORICAL GRADES WERE DIGITIZED BY AMEC FOSTER WHEELER AS PART OF THE WASTE STRATEGY
ANALYSIS REPORT DATED APRIL 2015. VERTICAL DATUM CONVERTED FROM NGVD29 TO NAVD88 (DATUM
SHIFT OF -0.75 FEET WAS APPLIED).
2. EXISTING GRADES ARE BASED ON AERIAL TOPOGRAPHIC SURVEY PERFORMED BY WSP IN FEBRUARY 2015.
3. THE ASH BASIN EXTENTS PRESENTED IN THIS DRAWING ARE BASED ON THE "COMPREHENSIVE SITE
ASSESSMENT REPORT - ALLEN STEAM STATION ASH BASIN," PREPARED BY HDR FOR DUKE ENERGY AND
SUBMITTED TO NCDEQ (NPDES PERMIT NO. NC0004979) ON AUGUST 23, 2015.
4. WATER TABLE ELEVATIONS FOR PRE -DECANTING CONDITIONS WERE PROVIDED BY SYNTERRA IN 2019 ALONG
WITH THE BASIS AS FOLLOWS: SIMULATED STEADY-STATE GROUNDWATER HYDRAULIC HEADS FROM THE 2018
SYNTERRA GROUNDWATER MODEL. THIS FLOW MODEL WAS CALIBRATED TO TIME -AVERAGED HYDRAULIC
HEADS MEASURED IN MONITORING WELLS PRIOR TO THE START OF DECANTING. THE SIMULATED HYDRAULIC
HEADS ARE TAKEN FROM THE SAPROLITE OR TRANSITION ZONE MODEL LAYERS, AND ARE APPROXIMATELY
EQUAL TO THE WATER TABLE ELEVATIONS.
5. TRANSMISSION LINES SAG ELEVATIONS PROVIDED BY DUKE ENERGY AND SHALL HAVE THE FOLLOWING
VERTICAL CLEARANCE FROM GROUND TO THE LOWEST SAG ELEVATION:
100 KV
22 FT.
230 KV
24.5 FT.
500 KV
30.5 FT.
INCHES
TH
SECTION D-DI.
KEY MAP
LEGEND
EXISTING GRADES
— — — — — — — — — — — — — HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
EXISTING RAB LANDFILL
PROPOSED CLEAN FILL
PROPOSED ASH FILL
PROPOSED SOIL BERM
PROPOSED DMM WALL
PRE -DECANTING GROUNDWATER
PRE -DECANTING GROUNDWATER MODIFIED IN AUTOCAD
CROSS SECTION TO ACCOUNT FOR ARTIFACTS CAUSED BY
LIMITED RESOLUTION OF GRID SIZE/SPACING IN MODFLOW
3D
7 FREE WATER PRIOR TO DECANTING
A I /'1 T r [1
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
SEAL
0 15 30 45
VERTICAL SCALE (IN FEET)
0 150 300 450
HORIZONTAL SCALE (IN FEET)
N.C. ENGINEERING LICENSE NO.
F-0342
11111111Ill/4
-\N CAR
0• 'FESS�
a SEAL y y
L- 043997
rt r 1 111r1\\
J74►2,�q
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS III
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS CBE
GASTON COUNTY, NORTH CAROLINA
FOR
ISSUED FOR APPROVAL
DUKE
ENERGY®
SCALE: AS SHOWN
DES:
ANR
DWG TYPE:,DWG
DFTR:
AMC
JOB
CHKD:
JDM
DATE: 12-12-19
ENGR:
JDM
FILENAME:
ALN C999.001.028-038 FINAL GRADING CROSS SECTIONS.DWG
APPD:
JDM
DWG SIZE
DRAWING NO.
REVISION
ANSI
22.0"x34.0"
ALN C999 ■ 001 .031
A
10
■

ALN C999-001.032
mv• A
INCHES
TENTHS
i
690
680
670
660
650
640
630
620
610
600
590
580
570
560
550
0 0 0 0 0 0 0 0 0 0 O o O 0 O
O O O O 0 0 0 O o 0 0 0 0 0 0
+ + + + + + + + + + + + + + +
O N to u7 CO r- 00 O 0 — N r0
SECTION E-E'
KEY MAP
4TER
O
0
Lo
LEGEND
EXISTING GRADES
- - - - - - - - - - - - - HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
EXISTING RAB LANDFILL
PROPOSED CLEAN FILL
PROPOSED ASH FILL
PROPOSED SOIL BERM
PROPOSED DMM WALL
PRE -DECANTING GROUNDWATER
PRE -DECANTING GROUNDWATER MODIFIED IN AUTOCAD
CROSS SECTION TO ACCOUNT FOR ARTIFACTS CAUSED BY
LIMITED RESOLUTION OF GRID SIZE/SPACING IN MODFLOW
3D
FREE WATER PRIOR TO DECANTING
KIr'1TCC`
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
2. THE STORMWATER DRAINAGE DITCH SOUTH OF THE RAB LANDFILL IS LOCATED WITHIN THE LANDFILL
FACILITY BOUNDARY (BASED ON THE 2008 PERMIT TO CONSTRUCTION APPLICATION BY S&ME, DATED
3/26/2008) AND AS SUCH, ANY EXISTING IN -PLACE ASH IN THIS AREA IS CONSIDERED ASH NOT SUBJECT
TO CAMA AND THUS DOES NOT REQUIRE REMOVAL.
REFERENCES
'141'
1. HISTORICAL GRADES WERE DIGITIZED BY AMEC FOSTER WHEELER AS PART OF THE WASTE STRATEGY
0
ANALYSIS REPORT DATED APRIL 2015. VERTICAL DATUM CONVERTED FROM NGVD29 TO NAVD88 (DATUM
0
SHIFT OF -0.75 FEET WAS APPLIED).
1
2. EXISTING GRADES ARE BASED ON AERIAL TOPOGRAPHIC SURVEY PERFORMED BY WSP IN FEBRUARY 2015.
0
co
3. THE ASH BASIN EXTENTS PRESENTED IN THIS DRAWING ARE BASED ON THE "COMPREHENSIVE SITE
NV
ASSESSMENT REPORT - ALLEN STEAM STATION ASH BASIN," PREPARED BY HDR FOR DUKE ENERGY AND
SUBMITTED TO NCDEQ (NPDES PERMIT NO. NC0004979) ON AUGUST 23, 2015.
4. WATER TABLE ELEVATIONS FOR PRE -DECANTING CONDITIONS WERE PROVIDED BY SYNTERRA IN 2019 ALONG
WITH THE BASIS AS FOLLOWS: SIMULATED STEADY-STATE GROUNDWATER HYDRAULIC HEADS FROM THE 2018
SYNTERRA GROUNDWATER MODEL. THIS FLOW MODEL WAS CALIBRATED TO TIME -AVERAGED HYDRAULIC
HEADS MEASURED IN MONITORING WELLS PRIOR TO THE START OF DECANTING. THE SIMULATED HYDRAULIC
HEADS ARE TAKEN FROM THE SAPROLITE OR TRANSITION ZONE MODEL LAYERS, AND ARE APPROXIMATELY
0
EQUAL TO THE WATER TABLE ELEVATIONS.
5. TRANSMISSION LINES SAG ELEVATIONS PROVIDED BY DUKE ENERGY AND SHALL HAVE THE FOLLOWING
VERTICAL CLEARANCE FROM GROUND TO THE LOWEST SAG ELEVATION:
100 KV 22 FT.
230 KV 24.5 FT.
NOT FOR CONSTRUCTION
A=COM
SEAL
0 15 30 45
VERTICAL SCALE (IN FEET)
0 150 300 450
HORIZONTAL SCALE
(IN FEET)
N.C. ENGINEERING LICENSE NO.
F-0342
\A �C of Ro
SEAL
043997
• 1111 K40`'```��
M 12 �11
TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS IV
ALLEN STEAM STATION
CCR SURFACE
IMPOUNDMENT CLOSURE PLAN DRAWINGS -
CBE
GASTON COUNTY, NORTH CAROLINA
FOR
ISSUED FOR APPROVAL
DUKE
SCALE: AS SHOWN
DES:
ANR
DWG TYPE:.DWG
DFTR:
AMC
ENH%xal
JOB : 606022CHKD:
2
JDM
DATE: 1
ENGR :
JDM
®
FILENAME:
ALN C999.001.028-038 FINAL GRADING CROSS SECTIONS.DWG
APPD:
JDM
DWG SIZE
DRAWING NO.
REVISION
ANSID
22.0"x34.0"
ALN C999 - 001 .032
A
1)
10

ALN C999.001 -033
ay. A
LEGEND
EXISTING GRADES
- - - - - - - - - - - -
- HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
EXISTING RAB LANDFILL
PROPOSED CLEAN FILL
_
PROPOSED ASH FILL
PROPOSED SOIL BERM
PROPOSED DMM WALL
PRE -DECANTING GROUNDWATER
- - -
PRE -DECANTING GROUNDWATER MODIFIED IN AUTOCAD
CROSS SECTION TO ACCOUNT FOR ARTIFACTS CAUSED BY
LIMITED RESOLUTION OF GRID SIZE/SPACING IN MODFLOW
3D
- n
FREE WATER PRIOR TO DECANTING
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
2. THE STORMWATER DRAINAGE DITCH SOUTH OF THE RAB LANDFILL IS LOCATED WITHIN THE LANDFILL
FACILITY BOUNDARY (BASED ON THE 2008 PERMIT TO CONSTRUCTION APPLICATION BY S&ME, DATED
3/26/2008) AND AS SUCH, ANY EXISTING IN -PLACE ASH IN THIS AREA IS CONSIDERED ASH NOT SUBJECT
TO CAMA AND THUS DOES NOT REQUIRE REMOVAL.
REFERENCES
1. HISTORICAL GRADES WERE DIGITIZED BY AMEC FOSTER WHEELER AS PART OF THE WASTE STRATEGY
ANALYSIS REPORT DATED APRIL 2015. VERTICAL DATUM CONVERTED FROM NGVD29 TO NAVD88 (DATUM
SHIFT OF -0.75 FEET WAS APPLIED).
2. EXISTING GRADES ARE BASED ON AERIAL TOPOGRAPHIC SURVEY PERFORMED BY WSP IN FEBRUARY 2015.
3. THE ASH BASIN EXTENTS PRESENTED IN THIS DRAWING ARE BASED ON THE "COMPREHENSIVE SITE
ASSESSMENT REPORT - ALLEN STEAM STATION ASH BASIN," PREPARED BY HDR FOR DUKE ENERGY AND
SUBMITTED TO NCDEQ (NPDES PERMIT NO. NC0004979) ON AUGUST 23, 2015.
4. WATER TABLE ELEVATIONS FOR PRE -DECANTING CONDITIONS WERE PROVIDED BY SYNTERRA IN 2019 ALONG
WITH THE BASIS AS FOLLOWS: SIMULATED STEADY-STATE GROUNDWATER HYDRAULIC HEADS FROM THE 2018
SYNTERRA GROUNDWATER MODEL. THIS FLOW MODEL WAS CALIBRATED TO TIME -AVERAGED HYDRAULIC
HEADS MEASURED IN MONITORING WELLS PRIOR TO THE START OF DECANTING. THE SIMULATED HYDRAULIC
HEADS ARE TAKEN FROM THE SAPROLITE OR TRANSITION ZONE MODEL LAYERS, AND ARE APPROXIMATELY
EQUAL TO THE WATER TABLE ELEVATIONS.
5. TRANSMISSION LINES SAG ELEVATIONS PROVIDED BY DUKE ENERGY AND SHALL HAVE THE FOLLOWING
VERTICAL CLEARANCE FROM GROUND TO THE LOWEST SAG ELEVATION:
100 KV
22 FT.
230 KV
24.5 FT.
500 KV
30.5 FT.
INCHES
liffiffiffiffiffiffileffileffill
TENTHS 10 20 30
650
640
630
620
610
ME
590
580
570
560
100-YEAR FLOOD I.LEVATI+ 621.0'
I
�— EAR FLOOD ELt 'I ION:
FXI. ING GR
7L
.
.............
4
ISTORIC
GRADE
fx
PRE -DECANTING GROUNDWATER LEVEL
(SEE REFERENCE 4)
i'
PROPOSED STORMWATER
DETENTION POND BERM
(SPILLWAYS/CULVERTS
NOT SHOWN)
- PROPOSED STORMWATER
DETENTION POND
(POND DRY IN NORMAL
CONDITIONS)
- SEE NOTE 2 REGARDING DISPOSITION OF
EXISTING MATERIAL BELOW EXISTING
GRADE AND ABOVE HISTORIC
GRADE IN THIS VICINITY.
O O O O O O O Oct
+ 0 0 0 0 0 0 ++
+ + + + + + + + + + O N r7 dO co I�I-
O � N � � u7 co � 00 m —
SECTION F-F'
&H
TO BE RELOCATED
00� 1A482 (100kV) TRANSMISSION LINE MAX. SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET)
660
PRE -DECANTING GROUNDWATER MODIFIED
FREE WATER PRIOR TO DECANTING IN AUTOCAD CROSS SECTION TO ACCOUNT
650 i + FOR ARTIFACTS CAUSED BY LIMITED
EXISTING GRADE_ RESOLUTION OF GRID SIZE/SPACING
IN MODFLOW 3D
640 — _ —
630
620
610
�1
600
590
AAB EAST STORMVATER CHANNEL
L_±_- --r --\
580
570
560
O o O O
O O O O
O ± N r7
FREE WATER PRIOR TO DECANTING
HISTORIC GRADE /
I �10-YtAK I-OOD EL 'A T ION: `i79.6'
l
�N u
F $
-
(
—r •i � ,•��
�+J�'� I I� III �I�/ /
��/�%��
lWiC
IF
KEY MAP
I �
25-YE R FLOO ELEVATION: 575.6' NOT FOR CONSTRUCTION
PROPOSED AAB STORMWATER DETEN TION POND
CL .AN FILL ABOVE HI TORIC GRADE (DETAILED DESIGN TO BE PROVIDED WI H TITLE
CONSTRUCTION LEVEL DRAWING )
FINAL CLOSURE GRADING CROSS
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Q SECTIONS V
,) CD � 00 m o+ ± N 2 �t Lo Qo r- 00 0ACOM
g ALLEN STEAM STATION
SECTION G-Go.
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
0 15 30 45 SEAL ,,,,,lil„A,,,,SCALE: AS SHOWN DES: ANR
,,N DUKE ,, _ �,�Cq�,o� DWG TYPE:. DWG DFTR: AMC
`��
O `JOB
S% / ENERGY® DATENO: 60602209 ENGR: JDM
VERTICAL SCALE (IN FEET) - Z SEAL CHKD: JDM
2'
v: y
0 150 300 450 ��::��439g7�'�; FILENAME: ALN_ C999.001.028-038 FINAL GRADING CROSS SECTIONS,DWG APPD: JDM
GIM�'. DWG SIZE DRAWING NO. REVISION
HORIZONTAL SCALE (IN FEET) ANSI ANSI D
12'rz�jq 22.0"x34.0" ALN C999 - 001 . 033 A
8 9 10
1 1 1
I
0
w
w

ALN C999 ■ 001 .034
mv• A
Am
.m
670
0
650
640
630
620
610
.m
590
580
570
560
550
O
0
+
O
2A10 (230kV) TRANSMISSION LINE SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET)
I —t
5N5 (500kV) TRANSMISSION LINE SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET)
I
1A606 (100kV) TRANSMISSION LINE SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET)
PRE -DECANTING GROUNDWATER MODIFIED
IN AUTOCAD CROSS SECTION TO ACCOUNT
FOR ARTIFACTS CAUSED BY LIMITED
PRE -DECANTING GROUNDWATER LEVEL EXISTING GRADE
RESOLUTION OF GRID SIZE/SPACING
IN MODFLOW 3D
FREE
WATER PRIOR TO DECANTING
(SEE REFERENCE 4)
—
HISTORIC GRADE
_
4z
AAB WEST STORMWATER
\
\
CHANNEL CONNECTION
I
\
�
77772111
I
I
�
PROPOSED AAB STORMWATER
AAB
SOUTH STORMWATER
CHANNEL
DETENTION POND
CLEAN
FILL ABOVE HISTORIC GRADE
(DETAILED DESIGN TO BE PROVIDED
WITH CONSTRUCTION LEVEL DRAWINGS)
ARMORED LETDOWN
1
25-YEAR FLOOD ELEV: 575.6
100-YEAR FLOOD ELEV: 579.6
—
O O O O
0 0 0 0
LEGEND
0 0 0 0 0 0
0 0 0 0 0 O
+ + + + + +
J-) co � 00 O
EXISTING GRADES
— — — — — — — — — — — — — HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
EXISTING RAB LANDFILL
PROPOSED CLEAN FILL
_ PROPOSED ASH FILL
PROPOSED SOIL BERM
_ PROPOSED DMM WALL
PRE -DECANTING GROUNDWATER
PRE -DECANTING GROUNDWATER MODIFIED IN AUTOCAD
CROSS SECTION TO ACCOUNT FOR ARTIFACTS CAUSED BY
LIMITED RESOLUTION OF GRID SIZE/SPACING IN MODFLOW
3D
FREE WATER PRIOR TO DECANTING
REFERENCES
1. HISTORICAL GRADES WERE DIGITIZED BY AMEC FOSTER WHEELER AS PART OF THE WASTE STRATEGY
ANALYSIS REPORT DATED APRIL 2015. VERTICAL DATUM CONVERTED FROM NGVD29 TO NAVD88 (DATUM
SHIFT OF -0.75 FEET WAS APPLIED).
2. EXISTING GRADES ARE BASED ON AERIAL TOPOGRAPHIC SURVEY PERFORMED BY WSP IN FEBRUARY 2015.
3. THE ASH BASIN EXTENTS PRESENTED IN THIS DRAWING ARE BASED ON THE "COMPREHENSIVE SITE
ASSESSMENT REPORT - ALLEN STEAM STATION ASH BASIN," PREPARED BY HDR FOR DUKE ENERGY AND
SUBMITTED TO NCDEQ (NPDES PERMIT NO. NC0004979) ON AUGUST 23, 2015.
4. WATER TABLE ELEVATIONS FOR PRE -DECANTING CONDITIONS WERE PROVIDED BY SYNTERRA IN 2019 ALONG
WITH THE BASIS AS FOLLOWS: SIMULATED STEADY-STATE GROUNDWATER HYDRAULIC HEADS FROM THE 2018
SYNTERRA GROUNDWATER MODEL. THIS FLOW MODEL WAS CALIBRATED TO TIME -AVERAGED HYDRAULIC
HEADS MEASURED IN MONITORING WELLS PRIOR TO THE START OF DECANTING. THE SIMULATED HYDRAULIC
HEADS ARE TAKEN FROM THE SAPROLITE OR TRANSITION ZONE MODEL LAYERS, AND ARE APPROXIMATELY
EQUAL TO THE WATER TABLE ELEVATIONS.
5. TRANSMISSION LINES SAG ELEVATIONS PROVIDED BY DUKE ENERGY AND SHALL HAVE THE FOLLOWING
VERTICAL CLEARANCE FROM GROUND TO THE LOWEST SAG ELEVATION:
100 KV 22 FT. 500 KV 30.5 FT.
230 KV 24.5 FT.
INCHES 1 2 3 1 TENTHS 10 20 30
0 0 0 0 0 0 0 0 0 0 0
O O O O O O O O O O O
+ + + + + + + + + + +
N r "t Lo (D r- 00 0-) O N
SECTION H-HI
KEY MAP
0 0 0 0 0 0 0 0 0 0 0
O O O O O O O O O O O
N M "t Ln co 00 O O + N
N N N N N N N N rl� rl�
670
660
FREE WATER PRIOR TO DECANTING
650
640
4 il
L
ME
i
620 \-
AAB DIKE BREACH -
(SEE NOTE 2)
610
ME
590
NORMAL POND I
WSE: 565.7' /
580 �__■_.. ._..
570 -
I
I
560
/
550
O O
0 0
0 0 0 0 0 0 0 0 0 0
O O O O O O O O O O
+ + + + + + + + + +
� r � `t �
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
2. THE INTENT IN BREACHING THE RAB AND AAB DIKES IS TO REMOVE THE DIKES FROM REGULATION AS
DAMS. THIS WILL BE ACCOMPLISHED BY PERFORMING A FULL LOCAL BREACH, I.E. TO REMOVE A PORTION
OF THE DIKE COMPLETELY DOWN TO NATIVE GROUND AT ITS LOWEST POINT SUCH THAT THE DIKE WILL
NOT IMPOUND WATER OR CCR MATERIAL. A SEPARATE NEW BERM WILL BE BUILT AROUND THE FUTURE
STORMWATER MANAGEMENT AREA FOR LONG TERM STORMWATER MANAGEMENT.
3. THESE PLANS DO NOT INCLUDE DAM BREACHING. SPECIFIC PLANS FOR THE WORK WILL BE SUBMITTED AT
A LATER DATE.
PRE -DECANTING GROUNDWATER LEVEL
/ I (SEE REFERENCE 4)
/ I
0 15 30 45
1 �
I VERTICAL SCALE (IN FEET)
I �
0 150 300 450
PROPOSED STORMWATER DETENTION
/ I1 POND BERM (SPILLWAYS/CULVERTS HORIZONTAL SCALE IN FEET
/ \ NOT SHOWN) ( )
NOT FOR CONSTRUCTION
TITLE
OUTLET CULVERT/
CHANNEL
PROPOSED AAB STORMWATER
DETENTION POND
O O O O O
0 0 0 0 0
SECTION H-HI
FINAL CLOSURE GRADING CROSS
SECTIONS VI
P"=com ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE No. FOR ISSUED FOR APPROVAL
LAKE WYLIE WSE: 565.7' F-0342
SEAL SCALE: AS SHOWN DES: ANR
:Q��►trrr�tiJ�DWG TYPE:.DWG DFTR: AMC
OO Cr/�DUKE
,,
O s`fJOB NO: 60602209 � ENFqv��®CHKD: JDM
a gSA[ DATEENGR: JDM 043097 ~; FILENAME: ALN_ C999.001.028-038 FINAL GRADING CROSS SECTIONS. DWG APPD: JDM
DWG SIZE DRAWING NO. REVISION
[ttOoN'S ` ANSI D
22.0"x34.0" ALN C999.001 .034 A
8 9 10
1 1 1
1 ■ 1
1 ■ 1

ALN C999-001.035
mv• A
INCHES
PRE -DECANTING GROUNDWATER MODIFIED
IN AUTOCAD CROSS SECTION TO ACCOUNT
FOR ARTIFACTS CAUSED BY LIMITED
RESOLUTION OF GRID SIZE/SPACING
IN MODFLOW 3D
660 /--- HISTORIC GRADE
EXISTING GRADE
650
640
\ I �
630 \ -
\ PRE -DECANTING GROUNDWATER LEVEL
(SEE REFERENCE 4)
620
610
M
AAB WEST STORMWATER CHANNEL
590
580
570
CLEAN FILL ABOVE
HISTORIC GRADE
0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
O (V p Ln co r- 00 O
SECTION 1-1'
KEY MAP
LEGEND
EXISTING GRADES
— — — — — — — — — — — — — HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
EXISTING RAB LANDFILL
PROPOSED CLEAN FILL
PROPOSED ASH FILL
PROPOSED SOIL BERM
PROPOSED DMM WALL
PRE -DECANTING GROUNDWATER
PRE -DECANTING GROUNDWATER MODIFIED IN AUTOCAD
CROSS SECTION TO ACCOUNT FOR ARTIFACTS CAUSED BY
LIMITED RESOLUTION OF GRID SIZE/SPACING IN MODFLOW
3D
FREE WATER PRIOR TO DECANTING
ninT��
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
REFERENCES
1. HISTORICAL GRADES WERE DIGITIZED BY AMEC FOSTER WHEELER AS PART OF THE WASTE STRATEGY
D
ANALYSIS REPORT DATED APRIL 2015. VERTICAL DATUM CONVERTED FROM NGVD29 TO NAVD88 (DATUM
r
SHIFT OF -0.75 FEET WAS APPLIED).
z
I
2. EXISTING GRADES ARE BASED ON AERIAL TOPOGRAPHIC SURVEY PERFORMED BY WSP IN FEBRUARY 2015.
0
0
"COMPREHENSIVE
0
3. THE ASH BASIN EXTENTS PRESENTED IN THIS DRAWING ARE BASED ON THE SITE
ASSESSMENT REPORT - ALLEN STEAM STATION ASH BASIN," PREPARED BY HDR FOR DUKE ENERGY AND
SUBMITTED TO NCDEQ (NPDES PERMIT NO. NC0004979) ON AUGUST 23, 2015.
0
4. WATER TABLE ELEVATIONS FOR PRE -DECANTING CONDITIONS WERE PROVIDED BY SYNTERRA IN 2019 ALONG
0
WITH THE BASIS AS FOLLOWS: SIMULATED STEADY-STATE GROUNDWATER HYDRAULIC HEADS FROM THE 2018
SYNTERRA GROUNDWATER MODEL. THIS FLOW MODEL WAS CALIBRATED TO TIME -AVERAGED HYDRAULIC
0
HEADS MEASURED IN MONITORING WELLS PRIOR TO THE START OF DECANTING. THE SIMULATED HYDRAULIC
(�
HEADS ARE TAKEN FROM THE SAPROLITE OR TRANSITION ZONE MODEL LAYERS, AND ARE APPROXIMATELY
EQUAL TO THE WATER TABLE ELEVATIONS.
5. TRANSMISSION LINES SAG ELEVATIONS PROVIDED BY DUKE ENERGY AND SHALL HAVE THE FOLLOWING
VERTICAL CLEARANCE FROM GROUND TO THE LOWEST SAG ELEVATION:
100 KV 22 FT.
230 KV 24.5 FT.
0
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS VII
P"=com ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
0 15 30 45 SEAL ```,,J'!'' SCALE: AS SHOWN DES: ANR
N CAS, i�DUNCE DWG TYPE:.DWG DFTR: AMC
"0
*�SS% �i'= ENFIk%jY® DATE:n JOB 60612-19 CHKD: JDM
ENGR: JDM
VERTICAL SCALE (IN FEET) � � ;� S�qL 2'• ��
:a
0 150 300 450 y� :�,043ga7: FILENAME: ALN_ C999.001.028-038 FINAL GRADING CROSS SECTIONS.DWG APPD: JDM
DWG SIZE DRAWING NO. REVISION
HORIZONTAL SCALE (IN FEET)
rttyCtl,`��� ANSI D
/2'12�lq 22.0"x34.0" ALN C999 - 001 . 035 A
TENTHS 10 20 30 4 5 6 7 8 9 10

ALN C999.001.036 wv. A
LEGEND
820
810
790
780
770
760
750
740
730
720
710
700
.••
B01
670
..•
650
640
630
620
.9•
590
580
O O O O O O O O O 0 0 0
O O O O O O O O 0 0 O O
N �t In co r- 00 m —
SECTION J-J'
REFERENCES
1. HISTORICAL GRADES WERE DIGITIZED BY AMEC FOSTER WHEELER AS PART OF THE WASTE STRATEGY
ANALYSIS REPORT DATED APRIL 2015. VERTICAL DATUM CONVERTED FROM NGVD29 TO NAVD88 (DATUM
SHIFT OF -0.75 FEET WAS APPLIED).
2. EXISTING GRADES ARE BASED ON AERIAL TOPOGRAPHIC SURVEY PERFORMED BY WSP IN FEBRUARY 2015.
3. THE ASH BASIN EXTENTS PRESENTED IN THIS DRAWING ARE BASED ON THE "COMPREHENSIVE SITE
ASSESSMENT REPORT - ALLEN STEAM STATION ASH BASIN," PREPARED BY HDR FOR DUKE ENERGY AND
SUBMITTED TO NCDEQ (NPDES PERMIT NO. NC0004979) ON AUGUST 23, 2015.
INCHES 1 2 3 TENTHS 10 20 30 4
EXISTING GRADES
- - - - - - - - - - - - - HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
EXISTING RAB LANDFILL
PROPOSED CLEAN FILL
PROPOSED ASH FILL
PROPOSED SOIL BERM
PROPOSED DMM WALL
PRE -DECANTING GROUNDWATER
PRE -DECANTING GROUNDWATER MODIFIED IN AUTOCAD
CROSS SECTION TO ACCOUNT FOR ARTIFACTS CAUSED BY
LIMITED RESOLUTION OF GRID SIZE/SPACING IN MODFLOW
3D
FREE WATER PRIOR TO DECANTING
A 1 /1 T r r1
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
KEY MAP
NOT FOR CONSTRUCTION
TITLE
0 0 0 0 0 0 0 0 O O 0 0 0 0 0 0 0 n FINAL CLOSURE GRADING CROSS
+ + + + + + + + + + + + + + + + + + SECTIONS VIII
0 O r- 00 0) O N r0 LO 00 O O
N N N N N N N N N N ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
4. WATER TABLE ELEVATIONS FOR PRE -DECANTING CONDITIONS WERE PROVIDED BY SYNTERRA IN 2019 ALONG GASTON COUNTY, NORTH CAROLINA
WITH THE BASIS AS FOLLOWS: SIMULATED STEADY-STATE GROUNDWATER HYDRAULIC HEADS FROM THE 2018 N.C. ENGINEERING LICENSE NO. FOR ISSUED FOR APPROVAL
SYNTERRA GROUNDWATER MODEL. THIS FLOW MODEL WAS CALIBRATED TO TIME -AVERAGED HYDRAULIC F-0342
HEADS MEASURED IN MONITORING WELLS PRIOR TO THE START OF DECANTING. THE SIMULATED HYDRAULIC SEAL SCALE: AS SHOWN DES: ANR
HEADS ARE TAKEN FROM THE SAPROLITE OR TRANSITION ZONE MODEL LAYERS, AND ARE APPROXIMATELY 0 15 30 45 ``0111►1111111/ DUKE
EQUAL TO THE WATER TABLE ELEVATIONS. `\`���(\A CI�ROii,��' DWG TYPE:. DWG DFTR: AMC
O ASS ` ENERGY® DATEJOB NO: 60602209 ENGR: JDM
5. TRANSMISSION LINES SAG ELEVATIONS PROVIDED BY DUKE ENERGY AND SHALL HAVE THE FOLLOWING VERTICAL SCALE (IN FEET) - Z : DM
4 2. �, r_
VERTICAL CLEARANCE FROM GROUND TO THE LOWEST SAG ELEVATION: = c. ;� SEqL
0 150 300 450 043g97
ik = FILENAME: ALN_C999.001.028-038 FINAL GRADING CROSS SECTIONS.DWG APPD: JDM
100 KV 22 FT.
'o o ��� DWG SIZE DRAWING NO. REVISION
U12
41 `230 KV 24.5 FT. HORIZONTAL SCALE (IN FEET) ����,22.0'SI D.0"?,�/J« ALN C999.001 .036 A
5 6 7 8 9 10

FEv• A
820
810
m
790
780
770
760
750
740
730
720
710
700
ME
670
650
640
630
620
610
m
590
580
570
560
NOTE: FINAL HEIGHT OF PROPOSED LANDFILL
HAS NOT BEEN OPTIMIZED. DUKE AND AECOM
ARE EVALUATING METHODS TO REDUCE THE
OVERALL HEIGHT OF THE PROPOSED LANDFILL.
CONCEPTUAL LANDFILL
FOOTPRINT/GRADING (SEE NOTE
1.2 IN GENERAL NOTES, DRAWING
NO. ALN_C999.001.002)
I
PRE -DECANTING GROUNDWATER LEVEL
(SEE REFERENCE 4)
FREE WATER PRIOR TO DECANTING
\
EXISTING GRADE
r
1
\ HISTORIC GRADE
v
'
\A
AAB
STORMWATER C
NNEL
O O O O O O O O O O O O O
O O O O O O O O O O O O O
+ + + + + + + + + + + + +
O N to � Ln co � 00 O O N
REFERENCES
1. HISTORICAL GRADES WERE DIGITIZED BY AMEC FOSTER WHEELER AS PART OF THE WASTE STRATEGY
ANALYSIS REPORT DATED APRIL 2015. VERTICAL DATUM CONVERTED FROM NGVD29 TO NAVD88 (DATUM
SHIFT OF -0.75 FEET WAS APPLIED).
2. EXISTING GRADES ARE BASED ON AERIAL TOPOGRAPHIC SURVEY PERFORMED BY WSP IN FEBRUARY 2015.
3. THE ASH BASIN EXTENTS PRESENTED IN THIS DRAWING ARE BASED ON THE "COMPREHENSIVE SITE
ASSESSMENT REPORT - ALLEN STEAM STATION ASH BASIN," PREPARED BY HDR FOR DUKE ENERGY AND
SUBMITTED TO NCDEQ (NPDES PERMIT NO. NC0004979) ON AUGUST 23, 2015.
INCHES 1 2 3 TENTHS 10
O O O O
O O O O O O O O O O O 000
O O O O
O O O O O O O CD O O O-
+ + + +
+ + + + + + + + + + + ++
n `t L0 O
r1_ 00 O O N ro O [1- 0000
N N N N N N N N NN
SECTION K-K'
4. WATER TABLE ELEVATIONS FOR PRE -DECANTING CONDITIONS WERE PROVIDED BY SYNTERRA IN 2019 ALONG
WITH THE BASIS AS FOLLOWS: SIMULATED STEADY-STATE GROUNDWATER HYDRAULIC HEADS FROM THE 2018
SYNTERRA GROUNDWATER MODEL. THIS FLOW MODEL WAS CALIBRATED TO TIME -AVERAGED HYDRAULIC
HEADS MEASURED IN MONITORING WELLS PRIOR TO THE START OF DECANTING. THE SIMULATED HYDRAULIC
HEADS ARE TAKEN FROM THE SAPROLITE OR TRANSITION ZONE MODEL LAYERS, AND ARE APPROXIMATELY
EQUAL TO THE WATER TABLE ELEVATIONS.
5. TRANSMISSION LINES SAG ELEVATIONS PROVIDED BY DUKE ENERGY AND SHALL HAVE THE FOLLOWING
VERTICAL CLEARANCE FROM GROUND TO THE LOWEST SAG ELEVATION:
100 KV 22 FT.
230 KV 24.5 FT.
ALN C999.001.037
LEGEND
EXISTING GRADES
— — — — — — — — — — — — — HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
EXISTING RAB LANDFILL
PROPOSED CLEAN FILL
PROPOSED ASH FILL
PROPOSED SOIL BERM
PROPOSED DMM WALL
PRE -DECANTING GROUNDWATER
PRE -DECANTING GROUNDWATER MODIFIED IN AUTOCAD
CROSS SECTION TO ACCOUNT FOR ARTIFACTS CAUSED BY
LIMITED RESOLUTION OF GRID SIZE/SPACING IN MODFLOW
3D
`KZ FREE WATER PRIOR TO DECANTING
A 1 /1Tr n
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
SEAL
0 15 30 45
VERTICAL SCALE (IN FEET)
0 150 300 450
HORIZONTAL SCALE (IN FEET)
KEY MAP
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS IX
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
1I11 D��E SCALE: AS SHOWN DES: ANR
CA�,o.,���' DWG TYPE:. DWG DFTR: AMC
.QFESsj0 �'JOB N0: 60603204 CHKD: JDM
:a SEAL 2'; y ENFntY® DATE: 12-12-19 ENGR: JDM
Y.
= c - 043 97
�'Y ;tr ; k - FILENAME: ALN_ C999,001,028-038 FINAL GRADING CROSS SECTIONS.DWG APPD: JDM
2C!N� DWG SIZE DRAWING NO. REVISION
ANSI D
J21r ��g 22.0"x34.0" ALN C999 - 001 . 037 A
9 10
1 1

ALN C999.001 .038
mv• A
INCHES
630
620
610
.1•
LEGEND
590
EXISTING GRADES
- - - - - - - - - - - - - HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
580
PROPOSED FINAL GRADES
EXISTING RAB LANDFILL
PROPOSED CLEAN FILL
PROPOSED ASH FILL
PROPOSED SOIL BERM
PROPOSED DMM WALL
PRE -DECANTING GROUNDWATER
PRE -DECANTING GROUNDWATER MODIFIED IN AUTOCAD
CROSS SECTION TO ACCOUNT FOR ARTIFACTS CAUSED BY
LIMITED RESOLUTION OF GRID SIZE/SPACING IN MODFLOW
3D
FREE WATER PRIOR TO DECANTING
KIn_=0
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
2. THE INTENT IN BREACHING THE RAB AND AAB DIKES IS TO REMOVE THE DIKES FROM REGULATION AS
DAMS. THIS WILL BE ACCOMPLISHED BY PERFORMING A FULL LOCAL BREACH, I.E. TO REMOVE A PORTION
OF THE DIKE COMPLETELY DOWN TO NATIVE GROUND AT ITS LOWEST POINT SUCH THAT THE DIKE WILL
NOT IMPOUND WATER OR CCR MATERIAL. A SEPARATE NEW BERM WILL BE BUILT AROUND THE FUTURE
STORMWATER MANAGEMENT AREA FOR LONG TERM STORMWATER MANAGEMENT.
REFERENCES
1. HISTORICAL GRADES WERE DIGITIZED BY AMEC FOSTER WHEELER AS PART OF THE WASTE STRATEGY
ANALYSIS REPORT DATED APRIL 2015. VERTICAL DATUM CONVERTED FROM NGVD29 TO NAVD88 (DATUM
SHIFT OF -0.75 FEET WAS APPLIED).
2. EXISTING GRADES ARE BASED ON AERIAL TOPOGRAPHIC SURVEY PERFORMED BY WSP IN FEBRUARY 2015.
3. THE ASH BASIN EXTENTS PRESENTED IN THIS DRAWING ARE BASED ON THE "COMPREHENSIVE SITE
ASSESSMENT REPORT - ALLEN STEAM STATION ASH BASIN," PREPARED BY HDR FOR DUKE ENERGY AND
SUBMITTED TO NCDEQ (NPDES PERMIT NO. NC0004979) ON AUGUST 23, 2015.
4. WATER TABLE ELEVATIONS FOR PRE -DECANTING CONDITIONS WERE PROVIDED BY SYNTERRA IN 2019 ALONG
WITH THE BASIS AS FOLLOWS: SIMULATED STEADY-STATE GROUNDWATER HYDRAULIC HEADS FROM THE 2018
SYNTERRA GROUNDWATER MODEL. THIS FLOW MODEL WAS CALIBRATED TO TIME -AVERAGED HYDRAULIC
HEADS MEASURED IN MONITORING WELLS PRIOR TO THE START OF DECANTING. THE SIMULATED HYDRAULIC
HEADS ARE TAKEN FROM THE SAPROLITE OR TRANSITION ZONE MODEL LAYERS, AND ARE APPROXIMATELY
EQUAL TO THE WATER TABLE ELEVATIONS.
5. TRANSMISSION LINES SAG ELEVATIONS PROVIDED BY DUKE ENERGY AND SHALL HAVE THE FOLLOWING
VERTICAL CLEARANCE FROM GROUND TO THE LOWEST SAG ELEVATION:
100 KV 22 FT.
230 KV 24.5 FT.
.-----------------------------
TENTHS 110 1 1
570
565
O
0
O
0 O O O
O 0 0 0
SECTION L-LI
CVIQTIAIf1 t-ro
■
CONCEPTUAL DAM BREACH GRADING
(SEE NOTE 1.3 IN GENERAL NOTES,
DRAWING NO. ALN_C999.001.002)
KEY MAP
660
650
640
630
620
610
600
590
580
570
560
0 0 0 0 0 0 �
O N r7 �t Ln Ln
EXISTING GRADE
(DIKE CREST)
CONCEPTUAL DAM BREACH GRADING
(SEE NOTE 1.3 IN GENERAL NOTES,
DRAWING NO. ALN_C999.001.002)
SECTION M-M'
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS X
P"=com ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
SEAL SCALE: AS SHOWN DES: ANR
0 15 30 45 `` ,-,N„CArR� ,'' DUKE
�� ��i � DWG TYPE:.DWG DFTR: AMC
U� • rrESs� �<,,�'�JOB NO: 60603204 CHKD: JDM
VERTICAL SCALE (IN FEET) =¢O Z : � = _ ENr-rlfn'*Y®[DATE. 12-12-19 ENGR: JDM
SEAL
043997 FILENAME: ALN C999,001,028-038 FINAL GRADING CROSS SECTIONS,DWG APPD: JDM
0 150 300 450 i •. �, _
��i� Q • �'�N�' ���� DWG SIZE DRAWING NO. REVISION
HORIZONTAL SCALE (IN FEET) ANSI
D.0"
12�rzj�� ALN C999 - 001 .038 A
8 9 10
1 1 1

ALN C999.001 .039
Fm►. A
6-FT DIAMETER DM
COLUMN (TYF
DMM PANEL CENTERLINE
q-
CHANNEL
LOW POINT
TORMWATER CHANNEL SECTION - GRASS LINED
NOT TO SCALE
1. TO PROTECT AGAINST EROSION AND TO ESTABLISH VEGETATIVE STABILIZATION WITHIN THE CHANNEL, TRM (TURF
REINFORCEMENT MATTING) WILL BE USED. THE SPECIFIC PRODUCT WILL BE BASED ON THE ANTICIPATED SURFACE WATER
VELOCITY AND SHEAR STRESS REQUIREMENTS.
2. CHANNEL SECTIONS SHOULD INCLUDE A MINIMUM 2% GRADE TOWARD THE CENTERLINE OF THE CHANNEL.
CL
CHANNEL
LOW POINT
2)STORMWATER CHANNEL SECTION - RIPRAP LINED
-I NOT TO SCALE
NOTES:
1. CHANNEL SECTIONS SHOULD INCLUDE A MINIMUM 2% GRADE TOWARD THE CENTERLINE OF THE CHANNEL.
TYPICAL PLAN CONFIGURATION
5'
(TYP.)
DMM PANEL
(TYP.)
70'-90'
r5"**'NDEEP MIXING METHOD COLUMNS
- NOT TO SCALE
NOTE: APPLIES TO NORTH AND WEST PERIMETERS OF THE RAB LANDFILL.
TYPICAL SECTION CONFIGURATION
2'
3 TYPICAL CULVERT
NOT TO SCALE
i rL
ROADSIDE ROADSIDE
DITCH DITCH
4 TYPICAL HAUL / ACCESS ROAD
NOT TO SCALE
NOTES:
1. HAUL AND ACCESS ROAD TO BE FURTHER DESIGNED
PRIOR TO CONSTRUCTION BASED ON ADDITIONAL ANALYSES.
2. ROADSIDE DITCHES ARE NOT INCLUDED IN THE FINAL
GRADES PRESENTED IN THESE DRAWINGS.
TITLE
GENERAL NOTES:
1. DETAILS ON THIS SHEET ARE TO BE
FINAL CONDITIONS AND THEREFORE
SHOULD NOT BE BUILT ON CCR
MATERIALS.
NOT FOR CONSTRUCTION
FINAL CLOSURE GRADING DETAILS
P"=com ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
I N.C. ENGINEERING LICENSE NO. I FOR ISSUED FOR APPROVAL
F-0342
SEAL
Ni t i r g11jill
C R /i'
O< O f S `SRO
a SEAL y y
=� 0430g7
Ml �, KtO��``��•
f2�rx �19
tow, DUKESCALE:
�. ENERGY®
AS SHOWN
DES:
ANR
DWG TYPE:.DWG
DFTR:
AMC
JOB : 606022/9
DATE:
ENGR :
J DM
FILENAME:
ALN C999.001.039
FINAL GRADING DETAILS.DWG
APPD:
JDM
DWG SIZE
I
DRAWING NO.
I REVISION
ANSI 22.0"x34.0" ALN C999.001.039 A
1 10
1
r�
•
0
W
0
INCHES
TENTHS i0 20 30

\ — \\� \ \`\\ \ �\=_ �.��i/ ���� �%—= �\ `_ � �� •♦\ \ \`� � — �` — � �`\�\ � `�\\`\\�oj:�\`� = '//�i7/ —`=`_ mac/ I ', _
qv
— •F `\ \ \ \ \ ��' / \ \ �
01
LLJ
NN
\co
w WWI
\ •�_ � , ,/ �__— _� , ; I ; , ; � � �
- - -, \\- _,- ► ► I it i ,I ,��,�-�-=�`==_-�-----
LL
/
79
/N 1,
/ Lj 1/0
O W 1I
r \ --— — — — — — � _ — — — Li
`0 --p 1 /+00 \ 1 0 11 31,0 11 4 0 11151,0 1161,0) 117 0 1118+ 0 9+ 0 1
- - - - - -
CD
\ \ �\ \ `\ \ co
52 / l ►
IN lo
ILOJ—
\ \ I 1 I \�` / I /\1J—\ \ •� \— — — — — — — — —
Zz-
IN
�-i_ /— SITING CRITERIA BUFFER LIMIT
r_\_ 1 I I (I ` \`\ ► ►I f / / / / co
If f
r i'► Y I 1 / `\ ` --\\ -- _\ \\ \\`'off .' / J' I \ \6 i
Ill(
�\ \`\ __ —\ \ `\ `\ � 1 ■Ill � �-- _
\ --
—CAI
Ld
YL
/If
\ \ \ \••\\� \ \ Z
\\!\\ \ \ 1\ III h
`, \ `\ �— — —_\_
% I \ 1
_,,—�\\\
�Q — — \ \ , / , �. / •� \\ \ \
\ \
0 INCHES 1 2 3 TENTHS 10 20 30 4 5
041
N
o �
/'ll
N
N
Oo
'o
0
N
0
of
+
0
N I
0+00 111+00 12
I
OI
0
co
O
O
C
041
EXISTING DAM
I I
=�c— 11111I'I'I I111fIII� i
, I I I
IIIIIIIlI1
CENTRAL DETENTION BASIN > �j 1�\�� i ' II ih 101111,
MI
CONCEPTUAL LANDFILL FOOTPRINT/GRADING
(SEE NOTE 1.2 IN GENERAL NOTES, SHEET
ALN_C999.001.002)
I /
''a1 II I I /Ili'i 11111 ;.11i;lil it
\/ ► �i /r� i li► Iili;1 Il;il
\ / 1 )1 1 Y I I , IIIII 111�111 II lI I I IJ n��l,
11; I� i �J�I I I 1\II� ilb I I�;Ilill it Y I II �I��I
\ i � k V /I I i �'�lil I lliilili III I); I I Y ►� I,,
it
I'! III 'I;
' ►� i�: IIIIII ili;l;lill l Y ' Is All
1 11"IrlriA� IIIIII 111,I111 I I�� I ` II �,tI�Y1
\ ,►I / /, rr II II III III
vll�I �/i i 11 �4IIIIiI 11 i;lil;l I I 'IIII I 'i I � ;�I�a
i IIIIIII All
II IIiiI I INI��f If k1h�l
IIII � Ill I I I III IIIII - �Y--- I tigll
ll�l I �,� i� ii IIIII I 1;IIIII IIII; �._':=h
9Nili�\I\I\M11 iilliii�'� lilillil�l I I II �I�i"�
I .\ I I I III I a III v,r rl �
n IIII IIII (IIIIIII , , II -oil l �� II I l i
I \111 \ ill II1,1, 1 IIIII : I ZyA(I�IV�I IIII bull
� �' a�\\1\ 1 I\I I III llll;l II�I;III (IIII I � II {\ el�y+iYl I li i I
V
h \\\`\�{ I I 111 I Illlllll IIII,:
I II IIIIII IIIII II III
\ `��a��'<�` III III� IIIIIII Illl�h i
��\�\\Y
— iI Ilili't dill ;Ili1� !I
11\ I II IIIII; I II II III
II II I Illllr
` ll Illll141111I ;IIII]
Il;lili; IIIIII
i1
1
l;11
1lil.111 III�;I Illh I
/ \Vr
7..•_' i / /_ i `;i'll;�;i IIIIII
;iIt Il
I1
II
�>=� i iI;II ;IIII
41I111 ;IIII
ALN C999.001.040 Fmv. A
LEGEND
625
PROPOSED MAJOR CONTOUR (25 FOOT)
PROPOSED MINOR CONTOUR (5 FOOT)
— — — — 625 — — —
EXISTING MAJOR CONTOUR (25 FOOT)
----------
EXISTING MINOR CONTOUR (5 FOOT)
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
ILL
LIMITS OF EXISTING RAB LANDFILL LINER
APPROXIMATE ASH BASIN WASTE BOUNDARY
LIMITS OF WATER
100—YR
100 YR FLOOD LINE
SITING CRITERIA BUFFER LIMIT
3 —
PROPOSED DRAINAGE FLOW PATH
HATCH LEGEND
LAKE WYLIE/ FUTURE STORMWATER MANAGEMENT AREA
CATAWBA RIVER
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SEAL
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CCR UNIT BOUNDARY // / / % I / \ / _ ` \ . d a114115
0 150 300 450
GRAPHIC SCALE (IN FEET)
NOT FOR CONSTRUCTION
TITLE
ON -SITE LANDFILL SCHEMATIC PLAN
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS -
GASTON COUNTY, NORTH CAROLINA
CBE
FOR
ISSUED FOR APPROVAL
it, 1�
DUKE
EN��GY®
SCALE: AS SHOWN
DES:
ANR
DWG TYPE :. DWG
DFTR :
AMC
JOB N0: 60603204
CHKD:
JDM
DATE: 12-12-19
ENGR:
JDM
FILENAME:
ALN C999.001.040-041 ON -SITE LANDFILL SCHEMATIC.DWG
APPD:
JDM
DWG SIZE
DRAWING NO.
REVISION
ANSI
22.0"x34.0"
ALN C999.001.040
A
1
10
•

ALN C999.001.041
ay. A
820
810
800
790
780
770
760
750
740
730
720
710
700
690
680
670
660
650
640
630
620
610
600
590
580
0+00
790
780
770
760
750
740
730
720
710
700
690
680
670
660
650
640
630
620
610
600
590
580
570
560
0+00
820
810
800
790
780
770
760
750
740
730
720
710
700
690
680
670
660
650
640
630
620
610
600
590
580
570
565
0+00
INCHES
1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00
1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00
1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00
TENTHS i0
0
820
810
800
790
780
770
760
750
740
730
720
710
700
690
680
670
660
650
640
630
620
610
600
590
580
12+00 13+00 14+00 15+00 16+00 17+00 18+00 19+00 20+00 21+00 22+00 23+00 24+00 25+00 26+00 27+00
PROFILE - A - A
REFERENCES
1. HISTORICAL GRADES WERE DIGITIZED BY AMEC FOSTER WHEELER AS PART OF THE WASTE STRATEGY
ANALYSIS REPORT DATED APRIL 2015. VERTICAL DATUM CONVERTED FROM NGVD29 TO NAVD88 (DATUM
SHIFT OF -0.75 FEET WAS APPLIED).
2. EXISTING GRADES ARE BASED ON AERIAL TOPOGRAPHIC SURVEY PERFORMED BY WSP IN FEBRUARY 2015.
3. THE ASH BASIN EXTENTS PRESENTED IN THIS DRAWING ARE BASED ON THE "COMPREHENSIVE SITE
ASSESSMENT REPORT - ALLEN STEAM STATION ASH BASIN," PREPARED BY HDR FOR DUKE ENERGY AND
SUBMITTED TO NCDEQ (NPDES PERMIT NO. NC0004979) ON AUGUST 23, 2015.
4. WATER TABLE ELEVATIONS FOR PRE -DECANTING CONDITIONS WERE PROVIDED BY SYNTERRA IN 2019 ALONG
WITH THE BASIS AS FOLLOWS: SIMULATED STEADY-STATE GROUNDWATER HYDRAULIC HEADS FROM THE 2018
SYNTERRA GROUNDWATER MODEL. THIS FLOW MODEL WAS CALIBRATED TO TIME -AVERAGED HYDRAULIC
HEADS MEASURED IN MONITORING WELLS PRIOR TO THE START OF DECANTING. THE SIMULATED HYDRAULIC
HEADS ARE TAKEN FROM THE SAPROLITE OR TRANSITION ZONE MODEL LAYERS, AND ARE APPROXIMATELY
EQUAL TO THE WATER TABLE ELEVATIONS.
790
780
770
760
750
740
730
720
710
700
690
680
670
660
650
640
630
620
610
600
590
580
570
560
12+00 13+00 14+00 15+00 16+00 17+00 18+00 19+00 20+00 21 +00 22+00 23+00 24+00 25+00 26+00 27+00 28+00 29+00 30+00 31 +00
PROFILE - B - B
820
810
800
790
780
770
760
750
740
730
720
710
700
690
680
670
660
650
640
630
620
610
600
590
580
570
565
12+00 13+00 14+00 15+00 16+00 17+00 18+00 19+00 20+00 21 +00 22+00 23+00 24+00 25+00 26+00 27+00 28+00 29+00 30+00 31 +CM +50
PROFILE - C - C
NOT FOR CONSTRUCTION
TITLE
ON -SITE LANDFILL SCHEMATIC PLAN
- CROSS SECTIONS
L=com ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
SEAL SCALE: AS SHOWN DES: ANR
DUKEDWG TYPE:.DWG DFTR: AMC
.�� O • f�SS� • �,,'� � JOB N0: 60603204 CHKD: JDM
ENERGY®
SEAL �:'y DATE: 12-12-19 ENGR: JDM
+� 043997' FILENAME: ALN_C999.001,040-041 ON -SITE LANDFILL SCHEMATIC.DWG APPD: JDM
O ��� DWG SIZE DRAWING NO. REVISION
' Ul�
ANSID
f2J� q 22.0"x34.0" ALN C 9 9 9.0 01 .0 41 A
9 10
1 1