_Revised_Allen CBE - Appendix D 1.29.20_20200129

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 #: 3612
SITE LOCATION MAP_
0 2000 4000 6000
GRAPHIC SCALE (IN FEET)
TENTHS 10
N PLANT ALLEN ROAD
BELMONT, NORTH CAROLINA 28012
0
JAN UJ R 27) 2020
DRAWING NO. DRAWING DESCRIPTION
ALN_C999.001.011
ALN_C999.001.012
ALN_C999.001.013
ALN_C999.001.014
ALN_C999.001.015
ALN
C999.001.016
ALN
C999.001.017
ALN_C999.001.018
ALN_C999.001.019
ALN_C999.001.020
ALN_C999.001.021
ALN_C999.001.022
ALN
C999.001.023
ALN
C999.001.024
ALN
C999.001.025
ALN_C999.001.026
ALN_C999.001.027
ALN_C999.001.028
ALN_C999.001.029
ALN_C999.001.030
ALN_C999.001.031
ALN
C999.001.032
ALN
C999.001.033
ALN_C999.001.034
ALN_C999.001.035
ALN_C999.001.036
ALN_C999.001.037
ALN_C999.001.038
ALN_C999.001.039
ALN
C999.001.040
ALN
C999.001.041
ALN_C999.001.042
COVER SHEET
GENERAL NOTES
EXISTING CONDITIONS PLAN WITH AERIAL MAP
EXISTING CONDITIONS PLAN WITH TOPOGRAPHIC MAP
EXISTING CONDITIONS PLAN - RETIRED ASH BASIN
EXISTING CONDITIONS PLAN - ACTIVE ASH BASIN
SUBSURFACE EXPLORATION LOCATION PLAN - RETIRED ASH BASIN
SUBSURFACE EXPLORATION LOCATION PLAN - ACTIVE ASH BASIN
ESTIMATED BOTTOM OF ASH CONTOUR MAP
ESTIMATED BOTTOM OF ASH CONTOUR MAP - RETIRED ASH BASIN
ESTIMATED BOTTOM OF ASH CONTOUR MAP - ACTIVE ASH BASIN
DEMOLITION PLAN - RETIRED ASH BASIN
DEMOLITION PLAN - ACTIVE ASH BASIN
FINAL CLOSURE GRADING PLAN FINAL CLOSURE GRADING PLAN - RETIRED ASH BASIN
FINAL CLOSURE GRADING PLAN - ACTIVE ASH BASIN
FINAL SURFACE WATER MANAGEMENT PLAN
FINAL CLOSURE GRADING CROSS SECTION LAYOUT PLAN
FINAL CLOSURE GRADING CROSS SECTIONS I
FINAL CLOSURE GRADING CROSS SECTIONS II
FINAL CLOSURE GRADING CROSS SECTIONS III
FINAL CLOSURE GRADING CROSS SECTIONS IV
FINAL CLOSURE GRADING CROSS SECTIONS V
FINAL CLOSURE GRADING CROSS SECTIONS VI
FINAL CLOSURE GRADING CROSS SECTIONS VII
FINAL CLOSURE GRADING CROSS SECTIONS VIII
FINAL CLOSURE GRADING CROSS SECTIONS IX
FINAL CLOSURE GRADING CROSS SECTIONS X
FINAL CLOSURE GRADING DETAILS
ON SITE LANDFILL SCHEMATIC PLAN
ON -SITE LANDFILL SCHEMATIC PLAN - AAB LF CROSS SECTIONS
ON -SITE LANDFILL SCHEMATIC PLAN - INITIAL LF 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]
1 - � yr. �,� � - ; -F _ - •ry+
DAD w'Ir
or
=. .f=�• �'_�.� r F,-d,,,, �'- _. _�._ ice' � � � • - _ 1
f:'r r. • ryr •:••a :;__ �" I�.,����..��"� CATAWBA RIVER/
LAKE WYLIE.
:4sfit' . .
x 1'
.ram %43�
_ 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 1/27/20 160603204 1 AB CLOSURE I ANR I AMC I JDM I JDM I JDM I ISSUED FOR APPROVAL
L
10
LAT: N 35.180
LONG: W 81.01 °
NOT FOR CONSTRUCTION
TITLE
COVER SHEET
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 tlssttt�SCALE: AS SHOWN DES: ANR
CARo��'� DUKE
p
DWG TYPE:.DWG DFTR: AMC
0•,ce,, JOB NO: 60603204 CHKD: JDM
ENERGY®
SEAL p: y DATE: 01 -27-20 ENGR: JDM
043997
FILENAME: ALN C999.001 .011 COVER SHEET. DWG APPD: JDM
DWG SIZE DRAWING NO. REVISION
ANSI 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.
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, HOWEVER WILL BE REMOVED AS PART OF THIS CLOSURE PLAN. SPECIFIC
SEQUENCING AND TRANSITION ACTIVITIES FROM OPERATION TO EXCAVATION OF THE LANDFILL WILL BE DETERMINED AS
PART OF FUTURE DETAILED DESIGN ACTIVITIES.
INCHES 1 2 3 ITENTHS io 20 30
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
REMOVE EXISTING STRUCTURE
CULVERT
TRANSMISSION LINE MAX. SAG ELEVATIONS
HATCH LEGEND
z
I
n
0
0
MARSHY AREA (D
0
RIPRAP
0
N
WETLAND
POTENTIAL HABITAT-
SCHWEINITZ'S SUNFLOWER
REMOVE EX. RIPRAP
NOT FOR CONSTRUCTION
TITLE
GENERAL NOTES
fiim=
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 ``oxxillirfill,11 SCALE: NONE DES: ANR
,�.e\ CA�0 -*, DUKE DWG TYPE:.DWG DFTR: AMC
=•�tiSS�0•• i^, f ' JOB NO: 60603204 CHKD: JDM
SEAL �: P ENERGY®
DATE: 01 -27-20 ENGR: JDM
c_ :a 043997'�
FILENAME: ALN_C999.001 .012 GENERAL NOTES.DWG APPD: JDM
.1 40 AlC1� DWG SIZE DRAWING NO. REVISION
WANSI
22.0"x34.0" ALN C999.001 .012 A
�
8 9 10
1 1 1
0
D

'a
mv• A
ALLEN STEAM STATION
PLANT ALLEN RD
---� COAL YARD
►
pf ilk i ASH 1 ' ♦ ti
I 1
i STORAGE �� -k•
M i — `
RETIRED ASH BASIN
1 � 1 ; ; I• 4
RETIRED ASH BASIN DIKE
(GASTO-016)
� ► 11 1 I I
o� • 1LA
..d
s/
4 , -
z i % ASH 1 �_
FILL 2
► 1 I
• ' is ASH i RETIRED ASH BASIN L—�
-_ '
.•• ► ► ► s co
FILL 1 I .----------- 1r
Olt• ♦ 1•• ► 1
► I
All
I
r7 ow phol
r I ASH fit
RETIRED ASH BASINi STORAGE ♦ i I RETIRED ASH BASIN LANDFILL i
PERMIT NO. 3612
#
ri I I IN
11 I I 1
♦ I► I 1 I 1 'I
JOWL% 1♦ 1 1 1 1 _
1 ♦ 1 ♦ I '
1 ,�.� •1, '-----------------
} ` tM,� ► '', 1 ACTIVE ASH BASIN - �
►� ♦ j - _ M �♦ NORTH DIKE F
F ■
f
REMt1
1
dr
■
dp
FL r
PRIMARY POND 3
- � PRIMARY POND 2 APPROX. **
PRIMARY PRE -DECANTING
r 1 POND 1 APPROX. WSE 640.0' wl
� •• PRE -DECANTING ►
PL }F, - - WSE 640.0'
Or it
0 .1 . - JIM-
or„ - _ - w
11110
_ w o
F Q
' ' LLI
o
< O
' = _ ,r �rL
1~
Q
LLI Mil ■
i >
F . 7 - � I
' POLISHING POND Q
k + IL APPROX.
i PRE -DECANTING
WSE 635.0'
_ R
�•— � ACTIVE ASH BASIN
' - J -
0 4
Ar _
- a -
60 1
r +'
bi _ _ i 1p l rIP& AL
L
or r v or
I T r
- - '— _ jr
JIL
�� - ,f�' _
1 NIL
_M4t t
1
1 irF
4N*�
ON_ ,
loll
0 INCHES 1 2 3 TENTHS 10 20 30 4 5 6
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.
ALN_C999.001 .01
LEGEND
DUKE ENERGY PROPERTY BOUNDARY
APPROXIMATE LIMITS OF IMPOUNDED ASH
------------------ ASH STORAGE BOUNDARY
W.S.E. WATER SURFACE ELEVATION
APPROXIMATE ASH BASIN WASTE BOUNDARY
NOTES
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2. REFER TO SHEET ALN_C999.001.012 FOR REFERENCES.
3. THE AERIAL PHOTOGRAPH WAS OBTAINED FROM GOOGLE © 2019
D
z
co
co
co
I
0
1
W
N
0
0 300 600
900
NOT FOR CONSTRUCTION
GRAPHIC SCALE
(IN FEET)
TITLE
EXISTING CONDITIONS PLAN WITH
AERIAL MAP
_
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 �llltlll
N CARp�'%,��
DUE
SCALE:
DES:
ANR
DWG TYPE:.DWG
DFTR:
AMC
1. ••�>GSS�O•• �A, +
° �
'
ENERGY.n.
JOB NO: 60603204
CHKD: JDM
01 -27-20
ENGR:
JDM
SEAL
�, r' _DATE:
�'
c_ 043997 -
�7 '� Q"• (t •
FILENAME:
ALN C999.001.013 EXISTING CONDITIONS PLAN WITH AERIAL.DWG
APPD:
JDM
GlNe
40 •.O'K
DWG SIZE
DRAWING NO.
REVISION
� 2.0
27
ANSI
22.0"x34.0"
ALN C999 ■ 001 ■ 013
A
8
9
10

ALLEN STEAM STATION
r�c
N.
\
l /
/ II I)1 I �1;� � '
%/t I`�_\
1 IWEIGHRALLEN D_ ./.
PLAN T STATION i \ r
COAL YARD
✓� \ \ \ \ ,/ ill I
°�(/ ! / — l ��I / I II � \ \ �/ 11 r\^ \ -�� . �/ ►� O W I \ \ /; 1- ------- • 'III�i I Ilf� lI f l,I II /// / "f`` +`. \\\ \\ \�\\ \\ \ \\\\ \ ) \ / ~._�' )// I/i/Ii /l lI�1 11,t iIlaI1 I 1I I LINED
1rdIHOLDING
O rl
If
_ \
I
, ASH STORAGE
1
I
` �I W
_-I ) I I I Ip W II I �I I II / / �\ \ \ t ,� \ _/ r
• I O; \ ,�, r ICI I III I; / i ,`\ 1 `\(e , ! �\ ��_�' ,r 1 1 ,
11 I OI IO \6c�
,�' I RETIRED 1 O w I ! r'_ 11�1 1 I I EX. SLUICE
/ I II COI c0 I @\\ \ �- <- _� �l�.l %-'��� 1
r/ \ , 1_ ASH BASINi p I / I 1 I II I IIIII \�\� �`\` ---- �.r c - = r/
11l I I PIPES \ \ _ V
CO, CO t I I 1 I I \ \�
(O 1 / �.�\\ _
° I / r _ I �I 1 i' 1 111 I I I I I I \ \\`�/►^v - — ��
/ i ,^)� / --_'� 1 //1 I I III II IIIII II �` _
, 1 1 I II I� I11 I I III I i= -- RETIRED ASH BASIN DIKE
!•_: TL 1 A482
i I I ! / I r TL 1A606 1 / I II I I 11I II (GASTO-016)
fill I ! / t \ 1 , (100kV)
(1 OOkV` I ` 1 / II ' I I • I I III I �/ / t I \\y\\"�
) lip
I° / / % � � � 1 � 1 /� i -■ I I IIII I / / / ,_`` �\ � f_ �' yti 1111111
TL 5N5 : 1
l '1
►- __ / ! �_, J ASH FILL 2
Z -- 1 ,
O 11 \ (500kV) I _. -L� �/ • 1, �Illlf I i II I 1 �/�� i /\\' / II"��I
/ _�� i _� .� h�f (t-6? h II p11
Q , /"\ It \ I `���� �`\ / // •,i 11 0 I 1 lol „s/ ���---- /, i \ \\`' �Cpry �Cp �CDry II Coll
s \\ / / -/ 1 l '•I tl�� (r `-.- RETIRED ASH BASIN 11�1 'Il
►- S \ / TL 2A10 ` _( \ ASH FILL 1%= \ti u1 III
\ II
� ° ♦ O• � � `_ 'I I\ �( `--------"i'"-�\\\ � � IIII III
O \ / / /'- ? -\ ; / )/ 230kV • SiZ`� \ \ Ilii _ . r--i
( )\ I -�aaaaaaaaa
/ \ \ /' / r \ I / �� �,pc ♦ / %- �� \ \.1 II III I ti� -\- -- _ _7 �-- f l 1 1 1 _-��---- I I
_� l/ II /i----- -- I
LI \ I I I I I _- 1 ! \ _ �laa-- - IIIIIIII
� \j 1 I III
----- - _ __�' /' ; ^ \- I w �- ASH FILL i ( ;l Ili II Ci f 1l �_ __ LL= - ~ L --- ----------------------
SLOPE--' ----- -I IIIII ill
/' _ ��' /' v `\� ' Illlll MI I I I ------- -__--_ ?r��� `— — — = ___— -. rl Illjlljl
l I r /-------- - 00000
it 1 1 DRAIN Iji1 1 I Ill ll _\ ---- =-----------I I I IIIIIIIII
�. . _ - -
1 0000,
I I W 1 I I I I I �' 11 I I� (' ij�i1 a— — — — — — — ,�----=ir? -_ `-_\ I I l I I IIII III
(TYP.) I I /111 Illlll I111
� 11l I I I I ►i ►i i i I i�i IIII \ 1 liliil I C I1I RETIRED ASH BASIN LANDFILL 1 i ; f f ff1l1111
! ( _ � RETIRED ASH �I I ! I IIIII II I11 IIII \\ it Ili It IIII i111 ii IIII Ili
BASIN 1 ASH STORAGE 41�1i — I ii� ��1� \\I1liii I ii�1 II f)I( / „% Ifl41 �!II"I1
I ASH LANDFILL PERMIT NO. 3612 II I
I I I \ \ \ li i I II III ll Ill�i 0, if 111 Ilil LOI II O O I�RI �10Ir
i I 1 I p 11 1 I O 1 0l I O I I� r fr cr N O
�6, �I 1 01 I. Lo) 1 Iu1iI IIIII I I� LANDFILL SLOPE DRAINS �II�I o o Icfl /I co co
1 \ \ h 5 � 11 W 1 �I I�rl Iscoll III)collt0 I I I II
ry 625. 62 s 1 I O 1 co I I I 11 11 I I. (TYP., LOCATION 1111
S r I I •I I I � n' TWIN EX I I I
ALN C999.001.014 � A
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
APPROXIMATE ASH BASIN WASTE BOUNDARY
LAKE WYLIE/
CATAWBA RIVER
NORMAL W.S.E. 565.7 FT. HATCH LEGEND_
Cp if I I 11 1 1 l 11 l 1 191 11 IIII IIIII IIII I I I
\\� \ �� I I I I I 11 I II I If III I j 11 I I I APPROXIMATE) I II , 11111 TWIN EX. PIPES
I I I I I I ll I I j111 _ PIPES 1 I
\\ ` 1 r I II I II I II� I 111 IIIII 1) III I
I / I I I I r 11I I I II I� I I I 11 tl 11 I� ll 1
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(ABANDONED)
! c\�- \t \,� ,1� } \ i //, ' !fill 1ji 11 LAKE WYLIE/
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INCHES
LAKE WYLIE
100-YEAR FLOOD
ELEVATION: 571.3 FT.
JURISDICTIONAL STREAM
LAKE WYLIE
100-YEAR FLOOD
ELEVATION: 571.3 FT.
PERMITTED SPILLWAY
NPDES
OUTFALL
002
JURISDICTIONAL STREAM
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
z
NOTES
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2. REFER TO SHEET ALN_C999.001.012 FOR REFERENCES.
O
0
3. POTENTIAL HABITAT FOR SCHWEINITZ'S SUNFLOWER WAS IDENTIFIED BY AMEC'S JUNE
1
24, 2015 NATURAL RESOURCES TECHNICAL REPORT. PRIOR TO LAND DISTURBANCE,
THE U.S. FISH AND WILDLIFE SERVICE MAY REQUIRE A BIOLOGICAL SURVEY OF THESE
O
AREAS.
1
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
0
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
-\\A C A RaJ
(�¢ F ti 5 S/O/•r 'i ..� -0 2;
+.
c_ a 043997
14- GIN
0
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
D NE DWG TYPE :. DWG DFTR : AMC
JOB
�, ENERGY®FTE.NO 001 -27-20 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
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LAKE WYLIE/
CATAWBA RIVER
NORMAL W.S.E.
565.7 FT.
LAKE WYLIE 100-YEAR
FLOOD ELEVATION:
571.3 FT.
ALN C999.001.015 � A
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-YR 100 YR FLOOD LINE
APPROXIMATE ASH BASIN WASTE BOUNDARY
HATCH LEGEND
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
Al111TCC`
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2. REFER TO SHEET ALN_C999.001.012 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 E S 0 200 400 600
OUTFALL NOT FOR CONSTRUCTION
SWO15
GRAPHIC SCALE (IN FEET)
TITLE
EXISTING CONDITIONS PLAN -
�
RETIRED 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
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JOB NO: 60603204
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DATE: 01 -27-20
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INCHES 1 2 3 !TENTHS i0
APPROXIMATE LIMITS OF IMPOUNDED ASH
LL LIMITS OF EXISTING RAB LANDFILL LINER
•""""""""' ASH STORAGE BOUNDARY
�••�••� LIMITS OF WATER
100-YR100 YR FLOOD LINE
APPROXIMATE ASH BASIN WASTE BOUNDARY
HATCH LEGEND
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
K1nTr-:C
z
0
1.
LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
'
0
2.
REFER TO SHEET ALN C999.001.012 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 -
ACTIVE ASH BASIN
�
AA�
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 `\\\\\,111111"1//1f
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APPD:
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DWG SIZE
DRAWING NO.
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��I,O ' ' "'I �
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ALN C999.001.016
A
9
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ALN_C999.001.017
LEGEND
xv• A
ipw.-,m I lr l
ANWW or IN
4
F lkp-w
ANWW-01
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CCR-26S
i
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T bE
PRIMARY
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APPROX.
PRE -DECANTING
WSE 640.0'
IIIIIIIIIIIII� � �
rw
FI-
PRIMARY POND 3
APPROX.
PRE -DECANTING
WSE 640.0'
a
LINED �t
HOLDING
BASIN
�f , � LAKE WYLIE/
� CATAWBA RIVER
NORMAL W.S.E.
� 565.7 FT.
W.S.E
S—X
x URS—X—B/S—X
A CPT—URS—X—S
AB—X/GWA—X/BG—X
SB—X
CCR—X
B—X
,oy_
B—X/OW—X
AB—X
A 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/'1Tt n
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
0 200 400
600
NOT FOR CONSTRUCTION
GRAPHIC SCALE
(IN FEET)
TITLE
SUBSURFACE EXPLORATION LOCATION
PLAN - RETIRED ASH BASIN
A"=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 llsstl!l�''
CARo���,,��
SCALE: AS SHOWN DES:
DUKE
ANR
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01 -27-20 ENGR:
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FILENAME:
ALN_C999.001.017-018 SUBSURFACE EXPLORATION LOCATION PLAN.DWG APPD:
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DWG SIZE
DRAWING NO. REVISION
0'Kp
ANSI
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ALN C999.001 .017
A
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1
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1

r%0101
INCHES
A
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TENTHS 10
11q.
■s - ■
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■
■
■
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Pr
if
PRIMARY
POND 2
APPROX.
PRE -DECANTING
WSE 640.0'
ACTIVE ASH BASIN
or
AV i L a.S'-I BASIN
NQRn�KF
0-30 PRIMARY POND 3
APPROX.
PRE -DECANTING
WSE 640.0'
No
2AB-25BRU AB-
B
R-25RR Ap
POLISHING POND I
APPROX. I
PRE -DECANTING I
WSE 635.0' I
FbI'
f
LAKE WYLIE/
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NORMAL W.S.E.
565.7 FT.
Ir
ALN
C999.001 .018
mv• A
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)
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.
0 200 400 600
NOT FOR CONSTRUCTION
GRAPHIC SCALE (IN FEET)
TITLE
SUBSURFACE EXPLORATION LOCATION
PLAN - ACTIVE ASH BASIN
A"=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 ````��tissttt������'
CA&0��-,�
DUKE
SCALE: AS SHOWN
DES:
ANR
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DWG TYPE:.DWG
DFTR:
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JOB NO: 60603204
CHKD:
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DATE: 01 -27-20
ENGR:
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SEAL y
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FILENAME: ALN_C999.001.017-018 SUBSURFACE EXPLORATION LOCATION PLAN.DWG
APPD:
JDM
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DWG SIZE
DRAWING NO.
REVISION
o Ko
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22.0"x34.0"
ALN C999 ■ 001 .018
A
9 10
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Ru. A
N
INCHES
N
I I 1N,\\1 II ��i I \11 � \\\ \\\ \\\ I \ ` ` `\ \
IN
\ 1/ \ \\ /
( ( \ \\ ALLEN STEAM STATION \\
N.
/ � _ _—_ �� --� ' / / 11 � / �%i�ii' � \ \ \_ � \= ` \✓/�i \� i%!�' \ iN, %/11%.-! �\1 1Ihy
fa `r, / ilk
//` \ -- I / J ,/\� w
\ r i `,__\ — --- -- l ---- PLANT ALI�.N RD ,( '''%' — _� i \�\ `Jli� i 1 �i ./i./;
\\ \\__ — 1 \\ —\y `` COAL YARDtill
I \ 1 \ I / I \\ 1 /�+C _ \ 1 '/ \\ `\ // \'� `\ \ \I \\\ /1� \ : L� '�ti/ i i li�ll� /i fly II I LINED \\ ( I k IN
\\
IN `-____ I - ---- \\ \ ; \ 1 \\ I 5,r/r//`�r//v�n,� �Jr/� lb y �ai� HOLDING �\ 0�I
8 _ _% --^ BASIN
— -625. — ^ ___ \`. / C\ \ \
w W �I \ \ l ,"�i/ i 1 \I� /�
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`-__� \ ' / \` ; r'/ `/r��^ r 111 \ �1.
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61
to 1 fj ill co
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LTJ\\ — \ `\ ` \ \ \ \ ` -----_ RETIRED ASH BASIN DIKE -_ t
TL 1 A482 i =— --
\ TL 1A606 ` O `: `` ` ` 100kV I --- (GASTO-016)
IN IN
/ W W / ► 1\\ \\ \\\ \ ` `----'-- --- �/ �/ , / / 1 IIII 11 111 I11
/ / i of
0 0 Q ,// '/ I j I j l\ \ Iill I1111111
TL 5N5
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500kV I / W // / I `--\��� \ -_-% �\ / /' II IIII IIII Il p1l
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l \1\ _ _ _ \ _ . ' / IIII I 1\ \\ / I _ ��� 1 �t \\ ``, ` -� `\ `\ \ // IIIIIII lII�I �Iij1 11
TL 2A10 1 �\/ \ \ \ — _ \ 1 1 u I 1
// ScS -/ \\ lr/'-\`•` \ �- / IIIII ll
P1111111/llI IIII III
° .--- — --, r / (230kV) IIIII I
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100-YEAR FLOOD
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LEGEND
— — — — — — — — — 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
0
KInTPC
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_C999.001.012 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.
0 300 600
900
NOT FOR CONSTRUCTION
GRAPHIC SCALE
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ALLEN STEAM STATION
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/
NOTES
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2. REFER TO SHEET ALN_C999.001.012 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.
i,- ` EMERGENCY SPILLWAY
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TITLE
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INCHES 1 2 3 (TENTHS 10
- - - - - 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)
NOTES
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
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r
2. REFER TO SHEET ALN_C999.001.012 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
ENGINEERS REVIEW.
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5. WORK WITHIN THE 100-YEAR FLOODPLAIN ALONG THE SHORELINE OF THE CATAWBA
�
RIVER MAY REQUIRE PERMITTING.
0 200 400
600
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it
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LEGEND
— — — - 625 - — — — EXISTING MAJOR CONTOUR (25 FOOT)
\
EXISTING MINOR CONTOUR (5 FOOT)
\ x DUKE ENERGY PROPERTY BOUNDARY
\ �`\ APPROXIMATE LIMITS OF IMPOUNDED ASH
\.\\ APPROXIMATE ASH BASIN WASTE BOUNDARY
III \ \\\ --,II )� \ OF \ \ \ \ \ \ II 0 DEOE f \ / IN
\\\�\ OF \ \ \\ \ \ 1 l \ ��\\\ ♦ DE �o \) ^r /
0 0 ALLEN STEAM STATION
of
\\ ,� \ \ \ \O��\\\\ \\0�0�oE �E I \ �;
\\ \� I I, � \-_/ �/ / `�1 / � O� 1 1 - \�_♦ \� O
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\)) , - _ ________ ______ _____ V / \ /f O O O \ \\\ ) �♦\\ !f �/ \ \\ ♦1<IiJ \,J/ ill Il/I I
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\ . -
/ OE - BULKHEAD - TO
CIE
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OE u
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=- __-_ ��T OE E REMAIN \�\�\ ��
0 �_ OE ,r -� / _� l° / W'
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O� W OE I - J / / -, \ \\� 1 / /
--- - I OF (� - -- - - RD \ - / ! / — / , (,r ) I / / I \ ) \�Ilt✓ I
- ---- -- — — T ALLEN ''' ' ( WEIGH STATION \ — / I/ I I 1 I I \y
\ I -- - PLAN `\ I \ / + i l/i//) /. I /// \ / 1 o I`\ , 11
COAL YARD I ► /'/\\ \
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I
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--\ I If I / \ \ \( ,'! \ \ , \ �i'1v I I I r I I ( 1
+ ) i (� I _ • 6(s` �i- `\. \\ \\ ; \von \) \\ / �� Z �l� „� ✓/ I ;/ / I/i ) NI IIJI RETENTION
-- e/ oW 0 / + i ' moo' C°� it 1 r BASIN
I I\ ww I I i I r / I I I I ' ///fit\\ / \\ n/
\ % / , I 10� �- F, " 00 I I I /'- I I +IIII // / \ / \\ \ -� 1 / \ I \\ p ,// / j
OE E OE--�--bEf 0� ! OE o REMOVE 24 CMP ASH STORAGE I I I -' i I I I I /! // \\�\ \ ( \\ \ /' \\ o -_-. .\/\� / I I cs _
OE/ OE _-- �� OEI rt-� OE I i / I I • I 1 III \ / \ - v ♦. 1 I O / o /
w I I I I I+ f I // // / \\�\ \ !\ r /-^ I O -�, CO : 1 i` - Cr
O o 1 I I J I • I +III / /\� \ \ / IN i % ♦\ \ / I I U, ti'
\ w\\♦\ I �\ / ) 1 i ��_ ���' �r I 111 \\ \ I1
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bi W1� /- `_( IT I I I
/--- 00 1 I I I I II II I % \ ` \\`� 1 --/ `! ) .A %/ )ill
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s1-LI �s 1 \ -\I `la�-- ICl^hrOI/ I 1 I/I/I s/ / I/) /I I1 -IIj / II f -' % I\)C/O /+/1 1///I I / // 1 l // /// // 1t /(f 1 /// � // r t ��\I r �� _1 -t+,\I \ \%\ � .\_/ _� , / ♦ / � /�� 1 `\ \ I�I1 I //'�IIt 1I1/1 r) I �-/.,``\ \ \ I - / � Ii1I I I II I 'I\! f 1/ I1 /I //)I1, I I /`/ l '/1 // I' I i 1 I,IIIIfIIII1III III,I' / DI IIIIIIII I1fI�iII IIIrIitII0II I llII I 'lI1II I II lI 1I 1 II
RETIRED ASII
(fl 'Ow W
BASIN W o REMOVE SLUICE
1 O 1 IIII /\_•,�' •- �_`- i�l�--I ---_�--_--_1, -�- -�1I -)- -_i,� - \ j-__- -_-_--'-6__'�5%_.)
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/ REMOVE MANHOLE ------___ / o REMOVE SLOPEi AND 48 CMP DRAINS (TYP.) Iy
Wii 00 (n
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LAKE WYLIE/
•1 CATAWBA RIVERI \�NORMAL W.S.E.
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565.7 FT.
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I I I I f / _ ;/ ' ` ` - RETIRED ASH BASIN II I I o I 11ti
/ • III II IIII % � \_-_-- I �
` __ J• I 1 1 r/ /IIII ASH FILL 1 I ----------
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w / p c __\ \ I Q 1 i I I I I I III I �`��---------- \ - _ I I I I
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I I j 11 1 11 111 I I IIIII 1 IIIII ------ - - \ \`--__ - - - ----------- - __ _
1 1 I I I I II I I I I _
I 1 I ► 1 _ ' ' 1 I IIII - I - I I I I I 1 I % 1 r- - - - - - - - - - - - -� ------ -� I r--_ ------ I I I j 1 (�\I 1100 1
\ I I Icc - I I -+' I I ---------------------- �� __ _ _
/�- / I I 1 REMOVE SLOPE I I I' \ I I I I \ \\ ■ ! i I , \) IcO I III Cp II 11 LOI
- ---_--_` ' I I I W Lj % Jl i DRAINS (TYP.) I I ( III I I I I I IIII ) IIII t _ / 1 \,� l i ) I I I III 111 1� 11 1 BE REMOVED ASRAB LANDFILL
/ -- J III I I I I 1 I I III \ 1 / I I I I 4�' I I
I I O O I Ill I fl \ \ II I I I I IIII \ I \ I ) 1 III III II III 11 I I
�`' I I III I I I 1 I I I I PART OF THIS
�A 1 J I III i i 1 1 j 1 1 1 I I I I 1 I I i i \ i I I II I I I I I CLOSURE PLAN.
O I I I I II I I I
\ \ I I I I I I I I I I I I I I I I I
I� l�/ J I I III \ II 1 1 I I I I I IIIII 1\I I I r 1 1 I 11 I I I
I _ I I \ it 11 I II r 11 11�1 11 I I
,'- RETIRED ASH ASH,' I I I ► 10 1 j i \ III , i I i i i i i l I i I I r/ 11 1 1 I i 1
BASIN I I + 0 1 I I`r' i 11 0 11 j 11 1 i� i i 1 1 RETIRED ASH BASIN �I III I I �I I i i i i I iII II l \ I W W W I I I I ICp Ill I (D O I 1 1 1 LnI I I I I III 1 f ( } i I I 1 i 1 I
I O 0 + �1 III III J I119 C9II ICI O I ti j 1 111 II11f1111 II 1
I O I I I I COI 1 1 I� (RAB) LANDFILL I I� I I I I IIII III f I
I I II 11 )+11 IIII � I Iij1 I` IIII IIII IIIII11111111 I+
\ /~ REMOVE EX. 48 \ 1 1 I w l J I III I III I I I+ I I IIIII ASH LANDFILL PERMIT u) I
\` \ \\ft*a_ \ -/ CMP AND MANHOLE I I; I I ) ASH FILL 2 i i I i I I I I i I ( I I I I I I IIIII '� I I I I 0 O h�1 1 i i , I I IOI I II j I
I I I I I I I I I I I I I I N0. 3612 (O I r 5 11c) I I ' I r
I 1111 1 11 11 I IIII I I I I I I 6 U� Lo 1 I
\\ \\) - �/ \ III' W W I I I I i i I I I I I I I I I I I I I I I coI Jr1 I 11 0 1
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\;` \ /' _ -_--------------- '- _ - ------ / IIjII j I
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\ \ \ --- \ I I \`\\ I 1 I 1 I I // I I I I 1-- HDPE PIPE - — — — ----'-------------- _ ,.___----- — f IIII EMERGENCY SPILLWAY
\ \ ____-- \ � - 2S ? � � 6 �� ``� to / � f \ — — — — - __ __--- - '�_----- �r� � f 11 I I I (TO BE ABANDONED)
�\ REMOVE x2 \ \ S\ S i i i i I �` 0. 1 i `-_--_-_-------------------�_ �— 4 ------_-----_ I 1
\ 1 \ \ a W O + 1 \ \\ ��\�\ \_ - CO/ �/ I 1 1 \ 3 bb /i -r I I ---- r
EX. 24° RCP \ . .' I
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o I I `\ ` . \�_./ 1 II ,• / 1 — — 625 - REMOVE RIPRAP (TYP.) $ I r
-- I 1 . I / . - - - - - --- ------------ 1�
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oW ow \ //^ — — -_ _ _ ___--- -_ _=__-_- .. /! RISER STRUCTURE
____--------- ------ ---------__ i �' i/i ! TO BE DEMOLISHED
___ __ ------ ----- _---- - —_ _ / J
L \ _� W1 (0 I \ \ ' -` - r ~ ____ _______�} II+I� \ 1 I 7
IIII 1
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NORTH
ABANDON SPILLWAY
\ ` ) w I 1 -'i �' --_____ r (SEE NOTE 14) 1 /
I ---------- 0 •
_ — �./ STRUCTURE TO BE I 1 I , I
/-\ � JI I + I /'/ `\ • I 1 __� - III � I.CO I \f I
I �� ` ♦ �' i ) I W W "'` icy / � '/ / � ---- \ / \� � 1 I y I I N 1100 I �
/ /Ni, ) • �•. I I DEMOLISHED , m
//� I y 1 I I ri 1 / \ -\ - - � -1 I ! \ � I I 11 1 J
\ 1 \\11 / % I I I I I �+ 11 1,
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► I j1�1 1 I1/.1( 1II 1II 1j II I 1 II 1
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COAL YARD SUMP
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\` IN ! /�
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O / % I I TYP. / ( I 9 I 11 I I cO 1 t LC)
) / ' i ( '� ! /�( I I (IIjII IIII
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O I I POND 1 I i. POND 2 I I I (IIII 1 1 1 1 1 1 1
/ I I (100 KV) TO BE RELOCATED 1 I 111 I III
_ O i -1 1 (LOCATION TBD / I i Iiii I i i i i l i i II I
I I W O I • ' _�__� )- __-___, f^ I I I I I I I I I I I!!
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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 SPILLWAYS WILL BE APPROPRIATELY DECOMMISSIONED.
3. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
4. REFER TO SHEET ALN_C999.001.012 FOR REFERENCES.
5. EXISTING VEGETATION WITHIN THE CLOSURE LIMITS MUST BE GRUBBED AND REMOVED.
6. THE RETIRED ASH BASIN LANDFILL IS CURRENTLY ACTIVE, HOWEVER WILL BE REMOVED
AS PART OF THIS CLOSURE PLAN. FEATURES ASSOCIATED WITH THE LANDFILL WILL BE
REMOVED OR ABANDONED.
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.
10. FREE WATER REMOVAL TO BE PERFORMED AS PART OF CLOSURE PROCESS.
11. ABANDON WELLS AS NEEDED.
N 12. MOST OF THE HIGH VOLTAGE OVERHEAD TRANSMISSION LINES ARE INTENDED TO
REMAIN IN PLACE AND IN SERVICE DURING CLOSURE ACTIVITIES. TRANSMISSION LINE
1A482 (100 KV) MAY NEED TO BE RELOCATED.
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.
14. EXISTING SPILLWAY LOCATED IN SOUTHEAST CORNER OF RAB TO BE ABANDONED
IN -PLACE BY GROUTING AFTER NEW OUTLET CONSTRUCTED.
0 200 400 600
GRAPHIC SCALE (IN FEET)
TITLE
NOT FOR CONSTRUCTION
DEMOLITION PLAN - RETIRED ASH
BASIN
leim=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 `\\)I)Iltrl,r! SCALE: AS SHOWN DES: ANR
III`I-III -\ C'A. W\ -i,DUKE DWG TYPE:.DWG DFTR: AMC
oFC5Si0•. i-. f � � JOB NO: 60603204 CHKD: JDM
`' SEAL 7." P - �, ENERGY®
DATE: 01-27-20 ENGR: JDM
c- :a 043997'-
1, : FILENAME: ALN C999.001 .022-023 DEMOLITION PLAN.DWG APPD: JDM
� '•. DINE .• � �� -
��i DWG SIZE DRAWING NO. REVISION
ANSID ALN C999.001 .022 A
9 10
1 1

mv. A
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J'`� rJ �•� I II REMOVE
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o o \ \ \ - //_' --' ` _- vu ""' — — — — — -� — —_ _ — — _ _ _ �`Do RISER STRUCTURE
- — — ----- -- ------- -------- _ _ / /' / i i / / TO BE DEMOLISHED
If
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�-; -/-____—_— —_ — — — — ABANDON SPILLWAY
\ 1 / w � i ! \ / ! /1�'=--_____='" � — _ _ _ � / (SEE NOTE 14)
h -7i- _ / — ��Cr�� / STRUCTURE TO BE y I j l0 , I
,' I \ _ / j\J(� p ,® ww / 1 , / ,' \ 1 \ ,/ 1 I DEMOLISHED _. co I I o 1
L^\ l i i � / I /,/ ��\ � _♦ � .r� j I \\ + I I III I 1
W I / / / III I �'r 1 / �\ f• \ \ I
REMOVE SLUICE _ 1 I I I IIII I COAL YARD SUMP
l\ \ \ i i 1 O / / / E o 1 .1 �,� `., _ i I i I I I I I
_ I ! 1 _� E I ^' PIPES (TYP.) �7 i i DISCHARGE
SO / -- t--�---- i/ / OE ��/ �r • /%�- % I ( I(I III I
— — ---- / , AID ,QF \ s .� Ir / I I 1 11 I III ABANDONED IN
;. �� — — �i_7i_ I v vE ��jc ' `� 1 u I 1 ( IIII I 1 I I (,
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I�
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o I I I I POND 2 TRANSMISSION LINE 1A482 I I I 11
W w I i� POND 1 i i 1 I (100 KV) TO BE RELOCATED
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1\ W\ \\ ® W'
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S� \ E's w \\ I \ ��---------__- ------ .�� • : �� y / / / •�`a'• 1 • \ I I I I I I I I I I
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11 W I \I `\\ _ � / — — /' •� • • /'// � J \` \\\ • -'�_ �
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J I I 1 1 11 I 1 1 \ - CHEMICAL / �� � \ i .^ f /� .�,`'J--/ /� . ` 1 0 \\_ram/ ( 11��� I 1 1 I I
1- 1 I 1 1 O I ` -- — / / BUILDING TO / i \ / / \ c5� \ 11 I I N I I O 1 ICT\
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II I IIII 1
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-- - ''�' — / � ,l^\ / GEOTUBE TO BE I^I it
--,\ `• ` ` 1 I I I I I I 1 \
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/ 1 . / / \ CO I I I (I O
/ / / I � 1 / / _ ��� ", I ) / /' /'• • \\ � -- ` \ (//I I IIII Ilu1 I I
! / / / / - , �^ / / . • \ \ (I I III I I I I ' j ' \\ r • \`\ \ L i �\ I j I i I Ii � I I I I I I '' __• / 1
W --- I
5 / / / p. ► /^ -, \ \ / , JI I Hill I I I I \
61 , / / / y / �� O 1 I / / O I \ v \ I ' /' \ • • '---_--"\ / 1 ( 1 TI IIIII
r ww /' I l 1 • • /' ,'� ` // \I I ` \1 \—' i� 1 it I I j I j I I I I I \ I /J
00 ACTIVE ASH BASIN \ \ l I I I—
I\ \ ) l Ill Il
W ( /) I �/ \ UI • • //r . \\\ \\\ I\J 1 L\ \/�I / I IIIII 1 I I (1 1 I I II�
/ I O
o ,� // \I. •�� ,' \\ /,ci / 1 i / l i �i�IIiII illliiii I `--
/ 1 / / �/ // \ \\ /� /^\ 'r I \\ I
1( I I I III (IIIII l
00 r
I.LLJ.�'
( /` , 62 / , I
O / / \ ,- r�\� 11 , c❑ If IIIN II o II I I
o I / . /'� J I o I I
W I �' \ • 1 /\
-Ig ; ,' o w o i :`• �• \ , , lili i ii1 i Iiilli1l -� tj o
6 / o� /' ho h� / O `\ ABANDON SPILLWAY r I I l I I I I w
w w -r I I I 1111
/ OO r`\ `\ \ \ ( 1 f111 III I I I I I
SEE NOTE 12 1 1 1 l Hill I Ill l I I I I I
/ w U-1 r �`' `\` ( RISER AND </ (I tl I I I I l
w i / 0 \ •• INSTRUMENTS TO
O
Lu
ww REMOVE TREES \♦ BE DEMOLISHED
I / , r ,1 0 ` .'^\
oo I (TYP.)
! 1 \ _ c
I l o /- w J '' '625 — _ - \__
I I.c) / /' w I CHEMICAL - �) I
I O o ° _� 'ifi w O O • -- —\ 1_04 l i•N Tj'p ` \ LO
-0 \_/ �_.� o_ , BUILDING (TO \�` `\ \ ' :I i/l rC° i I .�° / \ iL0
0 / / BE REMOVED _ 00
► 1 \
i \ / \ \ \ •
EXISTING WTS PAD
Ljj
\\ \\ •_-- i'/ // Cps ,__\ 6'> �`_-_ ' J rl /`\ \\ `\ `\ \ \\ � �� � i /' 1 J
% 675
II \ ` ,• / 1 1 _� -- > , \ 1 - o,or6, ! j
cb
CT1vOly V� J \I 1 \ � �\ �\ \\ / \ /�//
-
ell
oj� 10
Ile
\
--
to
/ ♦ / / \ \ \ \ \ \ 1 1 I 1 I ( \\ 1 \ ` \ \ \
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
III, 1 /\ T r 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 SPILLWAYS WILL BE APPROPRIATELY DECOMMISSIONED.
3. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
4. REFER TO SHEET ALN_C999.001.012 FOR REFERENCES.
5. EXISTING VEGETATION WITHIN THE CLOSURE LIMITS MUST BE GRUBBED AND REMOVED.
6. THE RETIRED ASH BASIN LANDFILL IS CURRENTLY ACTIVE, HOWEVER WILL BE REMOVED AS PART
OF THIS CLOSURE PLAN. FEATURES ASSOCIATED WITH THE LANDFILL WILL BE REMOVED OR
ABANDONED.
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.
10. FREE WATER REMOVAL TO BE PERFORMED AS PART OF CLOSURE PROCESS.
11. ABANDON WELLS AS NEEDED.
N 12. EXISTING SPILLWAY LOCATED IN SOUTHEAST CORNER OF AAB TO BE ABANDONED IN -PLACE BY
GROUTING AFTER NEW OUTLET CONSTRUCTED.
13. MOST OF THE HIGH VOLTAGE OVERHEAD TRANSMISSION LINES ARE INTENDED TO REMAIN IN
PLACE AND IN SERVICE DURING CLOSURE ACTIVITIES. TRANSMISSION LINE 1A482 (100 KV) MAY
NEED TO BE RELOCATED.
14. EXISTING SPILLWAY LOCATED IN SOUTHEAST CORNER OF RAB TO BE ABANDONED IN -PLACE BY
GROUTING AFTER NEW OUTLET CONSTRUCTED.
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 ``�\\\\\ntrrJ�, SCALE: AS SHOWN DES: ANR
�¢-(� C is f�W -0,, DUKE DWG TYPE :.DWG DFTR : AMC
o.tiSSj�•. /'1• f JOB NO: 60603204 CHKD: JDM
ENERGY®
_ :n. ' SEAL �'. Y _ DATE: 01 -27-20 ENGR: JDM
c_ . 043997 =
FILENAME: ALN C999.001 .022-023 DEMOLITION PLAN.DWG APPD: JDM
' •. GINS
i � Al .`� DWG SIZE DRAWING NO. REVISION
ANSI ALN C999.001 .023 A
9 10
1 1

INCHES
4 6 7 ALN C999.001 .024 FtEv. A
111 c ; , ` --\I �� r �\�� � ` \ ��\` �. \ — ► � Q` LEGEND
ALLEN STEAM STATION
OE
L / \ _ I 1 1100 625 PROPOSED MAJOR CONTOUR (25 FOOT)
_
\ .r \z \ PROPOSED MINOR CONTOUR FOOT)
_ 1 - 62E EXISTING MAJOR CONTOUR 25 FOOT
/,/
Il,
/�,,/ �1/ ter, �r� 1��I �I'\\ 1 ram__ EXISTING MINOR CONTOUR (5 FOOT)
,\ -- ------ • 1 - LLEN RD ^'v' ./. -� \j �� __ 1 / a • �� 4 ,, /7 1 ss r
\ --- -- I PLANT A ,, _�, _ -_ ' I \ \ \ 1� /� ii i / �i /vi r�In -,III
`\\ _ ; ` 1\ \ COAL YARD IIIII \J� 0C \
r / DUKE ENERGY PROPERTY BOUNDARY
LINED o`
APPROXIMATE LIMITS OF IMPOUNDED ASH
_ --__- _ �\\ `\I\/5�v�TL 1A606 (100kV) I�dr ilHOLDING\\\ O\rI
-� -- - --`- TOWER 4 / / '51'i / / II\/ � BASIN \\
_O_w _ �- RAB NORTH \ �I \\\ „�, // III , , j1� \� I LL LIMITS OF EXISTING RAB LANDFILL LINER
i/ -- _625-_ ((®E NOTE 9) \ _ // STORMWATER /� ; \ /'r_~���, \\\�'1 i I�1 1\
\ --- _ -----_ CHANNEL
- -ILL --- _----'_- _ ` / APPROXIMATE ASH BASIN WASTE BOUNDARY
_ p------''/- \ \ `\ I \6
h p/ I _ ' = _60 %' ----- \ \\`\\\ _ �� o`\`\\\\ ri 1 LIMITS OF WATER
1 co j r co - TL 5N5 (500kV) 1�?t\ .`\`\ \ \\ ` \, _,--' \�`�\ r `.� _ _ =___ ---- --;i /:� \ t= ij \t%
TOWER 67 �� - �� \\\`\\\ `\ \ _� \\ ..� — L 1. "E�J _ -,I I 100 YR FLOOD LINE
I - ` ---1�1 ` \ 1 \ \ \ \ RETIRED ASH BASIN DIKE 7 t 100-YR
W ` \-- .\ \ \ \ \/�/ CONCEPTUAL DAM BREACH GRADING
I II 1 I --Iz1 (SEE NOTE 9) \ \ �'Z . \ `\\\\` \ \ � \ \\ / /. \ � I
O _ _ \`.\ \\\\ \ `\ \,__/' / 1 \ (GASTO-016) _ I (SEE NOTE 1.3 IN GENERAL NOTES,
\ / i O ( ) \\\ `\ ,1 \\ \ \\\\� / I `\ J ' - �-\ STORMWATER FLOW DIRECTION
\ 1 , \\ / I _ , - _ \ DRAWING NO. ALN_C999.001.012)
TL 2A10 230kV
CONCEPTUAL INITIAL LANDFILL \ \`�\\ 11 \ `� �\ `---' r
FOOTPRINT/GRADING SEE TOWER 4 \I \ \I\\\11 \ 1\\\\\� \\ �\ - J \ `______________
\ 1 i ( (SEE NOTE 9) / ti 1 ,1\ \\\ \\\� `: - - - ,''�}'�. 1` I LAKE WYLIE/
NOTE 1.2 IN GENERAL NOTES, w 1 11\\ \\\\\ "' /
/ i 1 O w , 11 111 \\�:;� i CATAWBA RIVER
/ DRAWING NO ALN_C999.001.012) W O i 11, \�_ — /
/ ,o NORMAL W.S.E. 565.7 FT. HATCH LEGEND
CHANNEL GRADING NOT � �\ ills II loll
1\ 1 TL 1A482 (100kV) -
SHOWN (SEE NOTE 8) SSO_ W''' ( TOWER 3 I\`.� = - ��\\ \,, �_�'' 4 fill till II I111 FUTURE STORMWATER WETLAND (SEE NOTE 4)
W W / (SEE NOTE 9) ! \ \\`. ♦'^ /1 lllirlll111/ IIII III
i ,-� \��,•� ,/ l ,// \� . \ \ \. /' .' 1,/nll liZ/ !I:!I111 MANAGEMENT AREA
o
TL 1A606 ( )
100kV
1 � —
'/ --- o TOWER 5 CHANNEL GRADING NOT `\ \ -- / SHOWN (SEE NOTE 8) \ ��/----_IIJI ullll IIlIiIlII IIilIl1ii lIlII I I AREA TO BE
POTENTIAL HABITAT - SCHWEINITZ'S
ill (SEE NOTE 9) BACKFILLED AFTER SUNFLOWER (SEE NOTE 3)
�`--------'I�/ REMOVAL OF CCR
_
W ' -�
/ \
\, J IIIIIII ,' II,! PROPOSED LANDFILL LOCATION
I'o 111 to I II LAKE WYLIE
—_---- ,�— `\\\\-_=� _ — ` `--_=/ '`--- --'/// ��i cN0 Ic�Dil 100-YEAR FLOOD
1 % g15/ /% %III IIII illjll� I ELEVATION: 571.3 FT.
1 �� O ♦ \ \4 \ �i \ \ \ t/� �} I Ijj
\ •\\ _ \ fit. \ \� \ ` ��- \ ` / /-- �/' ,/,/ / / �/ '/ /' 1 III III II II
LLJ
I• W ���---__- __
/-- I III III I I
--____----1t1--- \ ® /'�--____- '�' -- I II IIII IIIIIII EMERGENCY SPILLWAY FUTURE STORMWATER MANAGEMENT AREA
\\\ \ ��\ _� �\\ -�` �\� /.:' �i - + 1 _'__`.\ i IIIIIII IIIIIII (TO BE ABANDONED)
l �! /''II 1111 1111 II
IIIII I
AAB NORTH
`W\ \�'/ -_- ,\�` �`\ _ .— / — �`"\ ` ��\\\-�, ✓� �////`'��// / \\ 1 \\ 1 II III�II�II�III I
RAB SOUTH 1 ♦'\\ p ` ��--------------
STORMWATER STORMWATER rl ►I IIIII II PERMITTED SPILLWAY
/ \ 1 \\`\�� ✓/ii/ I I 1 Il 11 I
\ I \ \ \ / \ --- \'r �`�� \ // \ `�;====sue \_./ \ CHANNEL -- _-/i�ri r ( )
_ \ , CHANNELS I _ _ \ 0 - �`�� CHANNEL GRADING NOT \` _ ___`_�\ \�_ _ __--___SS ____ ------ / (05
NOTES
\ --- /- t� _ � - 25 =— — � ci0 / % NPDES
SHOWN (SEE NOTE 8) -- _--------- _ _ ___ --_ -_ I fit, , Il ✓ 1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
-- -- OR14DIK _ _ _ _ — _625IIIII SW015
- \ I ` - � --' - -- __---_---_600- II II II III I
TL 1A606 (100kV) , -- _ - ___------; — - 1111 I 1 2. REFER TO SHEET ALN_C999.001.012 FOR REFERENCES.
--.r ---_- -- ��- I IIII n1 I 111 COAL YARD SUMP
TOWER 6 � yc i �i / r// _ -- I „ I i IIII III I I I
IIIIII111 IIII III DISCHARGE
1 % \ \ . (SEE NOTE 9) �- III , 1111 111NIIIII IIII
` IIIIIIIII IIII 111(ABANDONED)3. POTENTIAL HABITAT FOR SCHWEINITZ'S SUNFLOWER WAS IDENTIFIED BY AMEC'S JUNE
24, 2015 NATURAL RESOURCES TECHNICAL REPORT. PRIOR TO LAND DISTURBANCE,
II111I1 1 JilIl IIII THE U.S. FISH AND WILDLIFE SERVICE MAY REQUIRE A BIOLOGICAL SURVEY OF THESE
AAB TO RAB '� / 1 � IIIIIIIII Jill
I I I
l — / ®€ II I AREA TO BE BACKFILLED AREAS.
I \ -- - \----- STORMWATER �' � � � — � ®€ � IiliillilMnlll III
CHANNELIiilllill AFTER REMOVAL OF CCR
4. POTENTIAL JURISDICTIONAL WATERS (STREAMS/WETLANDS) WERE IDENTIFIED BY
AMEC'S JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT AND SURVEYED BY
TL 1A482 (100kV) Ni;1Il ,I
I o to' I L to MCKIM & CREED IN FEBRUARY 2016. CONFIRMATION IS PENDING U.S. ARMY CORPS OF
(TO BE RELOCATED CD i1l� it l II
ENGINEERS REVIEW.
650 / BY DUKE) Iliiluiii�i iiilii II AAB EAST
/ cr I IIIIIIII I I. STORMWATER
/o . I I IIIII I.
�11II�iiIllll I �I I I CHANNEL 5. WORK WITHIN THE 100-YEAR FLOODPLAIN ALONG THE SHORELINE OF THE CATAWBA
- / ��Illiiiliii„IIIII Ili it I,�. RIVER MAY REQUIRE PERMITTING.
o
- _ _ II II11 I IIII II
CHEMICAL W `�IllJil I IIII III III
1 I WW 1 IIIIIIIII 11 I111 6. THE INTENT IN BREACHING THE RAB AND AAB DIKES IS TO REMOVE THE DIKES FROM
\ --- /-- BUILDING - - I 11 I11yIIII III III II
IIIIIII'IIIIIII IIIIIII ( REGULATION AS DAMS. THIS WILL BE ACCOMPLISHED BY PERFORMING A FULL LOCAL
- (REMOVED) Iill11 11111 iilliii BREACH, I.E. TO REMOVE A PORTION OF THE DIKE COMPLETELY DOWN TO NATIVE
\ IjIIIjIi�111 I Ili III I LAKE WYLIE/
_ --- TL 1A606 - III IIIIIIIII IIII II GROUND AT ITS LOWEST POINT SUCH THAT THE DIKE WILL NOT IMPOUND WATER OR
I\�jllljll IIII III III CATAWBA RIVER
100kV \ III 111NIIIII fill,[ CCR MATERIAL. A SEPARATE NEW BERM WILL BE BUILT AROUND THE FUTURE
( ) i `\ CONCEPTUAL AAB LANDFILL �, pl='iiI111101 1iilii ( NORMAL W.S.E. STORMWATER MANAGEMENT AREA FOR LONG-TERM STORMWATER MANAGEMENT.
FOOTPRINT/GRADING (SEE p ,iil w � milli I 565.7 FT.
I \ \`\ co III iio
TL 5N5 \� \ .t NOTE 1.2 IN GENERAL NOTES, IIII Y 7. THE PROPOSED GRADES SHOWN FOR THE AAB STORMWATER DITCHES ARE
r I O N 10
1 1 t �� \\ (500kV) I o DRAWING NO ALN_C999.001.012) IIII m 11� ! CONCEPTUAL AND WILL BE FURTHER DEFINED ON THE BASIS OF FUTURE DETAILED
I h � I I 1 la) \ \ / \ ) \_-- m III H- I-
M I I 1 11 \\ �l /1 r\ \\ \\�`so \\� C° Iiil co Q IIII N DESIGN AND SUBSURFACE INVESTIGATION.
i \ TL 2A10 - I/ IIIII w Iiil I FUTURE STORMWATER
\ 1 \ 1 1 230kV II 1� I I 8. STORMWATER CHANNEL GRADING IN THE RAB AND NORTH/NORTHWEST PART OF THE
( ) lli IIII 1I \ MANAGEMENT AREA
AAB IS NOT SHOWN ON THIS PLAN. THIS GRADING HAS BEEN CONSIDERED AT A
Jill II `\ LAKE WYLIE 100-YEAR FLOOD CONCEPT LEVEL TO VERIFY ITS FEASIBILITY AND WILL BE SHOWN AS PART OF FUTURE
iillliilNl'I
ELEVATION: 571.3 FT.
AAB WEST IIjjII�iNIIIII I 1 \\v\ ,
AREA TO BE BACKFILLED - \ II I I I \ \ DETAILED DESIGN.
AFTER REMOVAL OF CCR -'/ \\ STORMWATER ii��Ii�� iil I IIIII \\\�;\ JURISDICTIONAL STREAM
CHANNEL '� IIII IMIIIII IIII `' I \\ 9. ASH SURROUNDING TRANSMISSION TOWERS TO REMAIN AND WILL BE CAPPED AS
(IIIII it \ SHOWN ON SHEETS 032 (TYPICAL PLAN AND PROFILE) AND 039 (DETAILS).
/ // �! �•� r y— � �- T III I I I I I
II.
` O , oo `'�' If II
lit
1, • 0 300 600 900
p NOT FOR CONSTRUCTION
/
IIIIIIII { I
III,II'625_111 III ••// I
//
CONCEPTUAL DAM BREACH GRADING GRAPHIC SCALE (IN FEET)
TITLE
DRAWING NO.
ALN C999.001.012)
' I �) '�' \;IIIII IIIII III II (SEE NOTE IN GENERAL NOTES, FINAL CLOSURE GRADING PLAN
AAB SOUTH I \ 1
\ \\� -:'� 1
o __ NPDES OUTFACE 002 ALLEN STEAM STATION
STORMWATER _ - 6 1/ --____ __ =%/
L=com
I I �"/ � S� � ' \ � � /� � �� - %'� ` \ PERMITTED SPILLWAY CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
I l Co)o co r /CHANNEL \�`�_\\ � � i - � i \ � , �� --' _= % �/ / \ \ \ \' GASTON COUNTY, NORTH CAROL I NA
1\ 1 i \, k' (TO BE ABANDONED)
N.C. ENGINEERING LICENSE NO. FOR
/ \\ o_= ' / ,/ EXISTING , , \ F-0ISSUED FOR APPROVAL
/ /'-`\ - I WTS PAD
JURISDICTIONAL STREAM SEAL AS SHOWN
'X ```'\\tt\Illrl// SCALE: DES: ANR
CHEMICAL 1 I CA DUKE
'- 1 , / / �.` �(� �Q DWG TYPE :.DWG DFTR : AMC
BUILDING SS i '.
� �O':� JOB N0: 60603204 CHKD: JDM
- = ENERGY
� `I� � I/ � \�� o\\ \ l� � (REMOVED) � SEAL p-
15 / I� \ I \ \\ /, =625 1 //' / - :¢ Y
6 ` I/� /, / /' /, / : 4 r- ; DATE: 01 - 27 - 20 ENGR : JDM
043997
AAB SOUTH /'/ ' i /``� /' -t� ALN C999.001 .024 FINAL GRADING PLAN.DWG APPR: JDM
<v , �\ / / , %' i' Q•:' � FILENAME:
\ , \ \ \ G
j STORMWATER INE.••'
CHANNEL \ '
DWG SIZE DRAWING NO. REVISION
ANSI D ALN C999.001.024
3 TENTHS 10 20 30 4 5 � 8 9 10
•
0

Ak\\
\ N \
------------
/
p
pit
/1
;
to
,1 r NNot-
/fl \\J,
1i �J/)LLJ
p \ \ Q0� 1/�\ \� O�r5, \\ \ \ \�\\ \ 0 ALLEN STEAM STATION I !^ \\1\\` \I
I i I I r-\jam 'O
11
\\\ / \ \✓ ----------------------- _ ``��_ \\
-_= J--------- �_ --11i OE - 0� \ \ \\ `, i \ . -�
/ t --- _ \ 'ram \ i %_ i_�-i ram, ♦
OE
of of __ / \ -0 I // O isi'ii%a' \ \ , f i�/ii r
OE GE _00i�/i \ \_ /pl
oE
OE rtTj�, --\`\ �),�i / \ _ \ _ �� _� ,r�/%/� /[� (-I�/(/ r�l' 1i��� \\ p
/ice'''111
-___ ----- I RD
- --- O
\ _---- ----- PLANT Av�
__ _ _ \
COAL YARD I / i I `�� 0 \
\ / O TL 1A606 (100kV) '-\\\ \\\ /\1\\ �` \' \\\ I ---'� LINED HOLDING \1�
/ \ w / \ �' ` \ \ \ \ 3 -, I l l l 1 ii/' i� �� I BASIN r 1
w �__9Lf
TOWER 4Lf - / \ ✓/9ti 1 I�
( �' '------ — — ,, \ \\ i i \� \\ \\ \ ; \ % \\ \ 7� 2 11/��'r 1,r/ ✓ l �/�
(SEE NOTE 7) _ i ` / / ` ` \
OE OE OE \ �F OE J / i �O _ 640 - -625-\\�,-'- i /\\\\\\ (�J `\ \ I \\\ \ , �l%� l i i ylv (� / t° i it \\�\\
OE
fl
---Q�--^\-----___ -\ RAB NORTH OE
\\\\\ \ \\
----- ^ — ` \ STORMWATER \\` \ 1 ` \ -/ \`�� \-- ------ _ ^�
- // r� — — — ` �� \ `\ \ \ `\� c'_ t' r-' _-,
------ / _ ------ _�\\ `\ `, CHANNEL \\
I / l O I i—� �� �• `600 _ ---
TL 5N5 (500kV) _ �`� _ -� `\ \ \ ` ` \ \\` \`` \\` `\ --- --�''' \� :
/ I \ \ \ \ \ \ \ \ \ \�_ Jam_ \\\\\a \ \\\ / v e� � �
_ I� - TOWER 67 _ \ `\ \ \ \ \ \ ` - `\\``, \\ �\-------------------
(SEE--r� y �� 1
_-- II I I:
------ w NOTE 7) �`\ \�_ - `.\`\\ \`\ `\\\ i `\ `\ \\\ \\ ,/ -\ \`���� - _ --r�r
-------------------
------------
----------------
CONCEPTUALr------
4 INITIAL LANDFILL -- i
FOOTPRINT/GRADING (SEE NOTE O (TL 2A10 (23OkV) \ \ \ \ \\\\ \ \\ \\ \\ `\� `\ `\ \ \ / ) ----- -
I 1 I \ y 1.2 IN GENERAL NOTES, DRAWING TOWER 4 1 \ \ \ \ \ /J
NO ALN C999.001.012 645i SEE NOTE 7 Lij
------------
/ I / p0 w L(_I �� TL 1 A482 100kV
FUTURE STORMWATER
MANAGEMENT AREA
LAKE WYLIE/
CATAWBA RIVER
NORMAL W.S.E. 565.7 FT.
OW O - / ( ) \ • \ _ ` \ ` - -----------------J'/ I I I I 1 `CONCEPTUAL DAM BREACH
/ ������ \ li \ `- ' I I IIII I O ,
11 W r r--- O W1J j TOWER3 ---= ---- `� \` ' IIIIII I �IO11 y
co `� \ `� \ ` ` / /' II II II �II CO I GRADING SEE NOTE 1.3 IN
O c0 / (SEE NOTE 7) \ \ `�\ �____-- \ \ ``--'� , I II I I I Ii III
IIIII'' III' III IIIIIII I GENERAL NOTES, DRAWING
iiliiil lii'illililll'll I
l l 11,1 (11 I I III III NO. ALN_C999.001.012)
1.
/i' 11 ill r J/ /1 ry II j I i
LLj W , , /l
GJ q _ - / \ , I l_r ,/ \\ \ \� . ��\\\ \ \\\ /r // J� 1t
-r/ \\I \\ \\\\\ \\ / III
_____ __` O/ � I I III11Ij I111 1 1h1Y� I II�III,I III
III
TL 1A606 (10OkV)II '1 II I
TOWER 5 ,� � `\ \ �� 1` \t j� 1 /
/ ' _-------- -- _ — , / \ ` �`\ \ / / ------ / I IIII I I IIIIIII I I
(SEE NOTE -_
LOJ7)
� —___0
O O /
-' % II 11 /I1111111
/ /r
� II'
II ,r I 11 1 I I III I I I
roQ
f- / — — — — — — — — — — �i' ,/'-`\ \ j Li
Idl r -�� �eJ ,/ ��\ �+ /� i //�(�'l // /� / , I I I I I I I I.■rl . I 1 . I 1 II
��/ _ / r OI I I I I
Ile
i1olili
0 — \ - 00----------'' ' — '' / r'' /' / /' % / I j I IIII I I 1 I I I II
„�� CHANNEL GRADING NOT
`\ 1 �� ,''�� / �} — — ' //'---------------------- \ �` ,/' % GJ�I
\ �� -
\ \ \ \ < I \ \ - SHOWN (SEE NOTE 6) / / �, _ �/ Ile
,/ III IIII I i 11 I I I I
\ �� \ \ — � _----_ . . �
\ o - \ ♦ -�IANMft- \\ I' 1
j \ \
`_ O -• �__ _ _ / �/ I I I I
` _ \\`\\ _ — _ — J ` ��.\ �`...�` I,II� I ---- - ''//�--_�'/ /' / / // ''_- _ ,��'�.''••' I III IIII IIIIIII
\ \ CHANNEL - �� ----------------- -- \ ,\ `'--------------' 1 I I I I I 1
\
\ �\ GRADING NOT - - `��� ----- -- _ \ \ \�- // _,�'� l ►/ i i I I I i I i M I I I I 1 I 1
\ — \ \ ------ .-- - �1 I I I I I
\ \ SHOWN (SEE �'' \ ___--'' ,.--- - ``\� \ `\ \ `\` `\ �`` ��► .'i- / _---- { 1 \ /'' '---_ `�\ I I I I'
I III � II III �IIIII �II nII III II I1I III I III II IINOTE 6) `r /RAB SOUTH \\O
\\`\---- AAB NORTH
-- i ,
\` \ CHANNEL '' \ ' _-_ - - - -' \ - _ TER
_ \ —_�\`�` `\ `�/// / / \\
-_- \\ STORMWATER
1 \ ► \ \ `�� `\\ _,- -_ ------ \ \\ - -625 1i , `\ ``- \
---------------
CHANNEL . CHANNEL J ►I II�1 II(! /!/
\ \ \ 1 / \ — ` ./../
O`�` CHANNEL GRADING NOT \`--- ----- \ /_-_-600.— - _ _____________ __________
`_-_ Al \ '--\� SHOWN (SEE NOTE 6) --- _ ----'- `r\ ____�= \-____- -- _62 — _ _ _ _ — ---4 co (I o
t\ _------- ------ _ _--- -- ----- ----- ------ - r
h S 1 �640 �� \ \ ■� J -- _ - - — ----NOR%/
l I� - DIKE
li�� / �-H----� --__- --_= --------
If
_ _
_=--_____________ ____ - I it-=- = - —_ -_--_ _ — —_ -' I►I i , 111 ' I 1 /
TL 1A606 (100kV)
TOWER 6%____-
/
`\ ' , (SEE NOTE 7) \ i 11 I 1 j 1 I 11
� .-' � �' I �'I � IIiIiIliillllili ri�I I
I1,�i11,1111�1 I ,III
v/III 1 1 I I I
11111111'IIIIlIl 1111
AREA TO BE BACKFILLED
AFTER REMOVAL OF CCR
100-YEAR FLOOD
ELEVATION: 571.3 FT.
EMERGENCY SPILLWAY
(TO BE ABANDONED)
PERMITTED SPILLWAY
(TO BE ABANDONED)
NPDES
OUTFALL
SWO15
r5 I i I l I III III I III COAL YARD SUMP
\ ---- \_------- _ IiI�iiJiIillllDISCHARGE
(ABANDONED)
f
l /J ( AAB TO RAB AREA TO BE BACKFILLED
STORMWATER
l I III I I AFTER REMOVAL OF CCR
CHANNEL I r' Ililillll i�i I
o�jlll'�°Illlili IIII, I
TL 1A482 (10OkV) � 'I N l i lit N i i I
(TO BE RELOCATED 11 I(O I I I I I o I I (COD I
I' Jill,
I' I I I I II AAB EAST
I ,\ // ,/ 650 I, BY DUKE) t i1i�I�Ili; IIII ( I I I I I II I
jl5' �i' ,' / / I IIII IIII IIIII III I I I STORMWATER
1 (_� - --__ ---- / I
/4 ' IIIIIIIIII III I 1 I I I 1 I I
�' / I IIII IIII IIIII III I I CHANNEL
\ / __- Jr / Iilliiiiliiilliiili III li I�Ii
_ - /,/ r I \ IIII IIIIIII IIII I I �II I II
\ 111 I I I I III II 1'
I
O // \ _ _ _ \ I I II I11II I I I IIIIIII '1 I
\v
INCHES 1 2 3 ITENTHS 10
625
----625-
ALN C999.001.025 � 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
� • • � 0 * 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 LANDFILL LOCATION
FUTURE STORMWATER MANAGEMENT AREA
KInTPC
1.
LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2.
REFER TO SHEET ALN_C999.001.012 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.
6.
STORMWATER CHANNEL GRADING IN THE RAB AND NORTH/NORTHWEST PART OF THE
AAB IS NOT SHOWN ON THIS PLAN. THIS GRADING HAS BEEN CONSIDERED AT A
CONCEPT LEVEL TO VERIFY ITS FEASIBILITY AND WILL BE SHOWN AS PART OF FUTURE
DETAILED DESIGN.
7.
ASH SURROUNDING TRANSMISSION TOWERS TO REMAIN AND WILL BE CAPPED AS
SHOWN ON SHEETS 032 (TYPICAL PLAN AND PROFILE) AND 039 (DETAILS).
0 200 400
600
NOT FOR CONSTRUCTION
GRAPHIC SCALE
(IN FEET)
TITLE
FINAL CLOSURE GRADING
PLAN -RETIRED 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 `\\\0111lrlrr/,///
\A CARQ���'
DUKE
SCALE: AS SHOWN
DES:
ANR
DWG TYPE:.DWG
DFTR:
AMC
o�tiss/o.. ��, +JOB
NO: 60603204
CHKD:
JDM
SEAL —
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ENEnt""v®
c_ : a 043997 '-
DATE: 01 -27-20
ENGR:
JDM
FILENAME:
ALN C999.001 .025-026 FINAL GRADING PLAN.DWG
-
APPD:
JDM
%p
•. N01
,14 N E� ' ��
• .... �'�
DWG SIZE
DRAWING NO.
REVISION
ANSID
ALN C999.001.025
A
9
1
10
1
Z
n
CD
0
V '

\—
�ij I j i j �;j CO COi- -— I I I I
L
\ CHANNEL GRADING NOT�
SHOWN ' / / J , 11I IIII I I I I I
/ / l '�r I I I I I I I I I I I I
\\_ \ �� \\ `♦ 1 �•/''�j /�}--_— /,' -'--- \� ~� /--_��� (SEE NOTE 6) // // / / / ' 1 II IIII IIIIIII I
--------------- / 11 I I I 11 I I
\ ��� ,' ♦ / / ,' , / r\ / 1 I I III I I I I I
\ �-- \ � ---- \� ` — \ — — � _ "� I'�• ``� l \`\` --�- - � �'------- '� �'' '' / ' - / i / �••' I ; ; I; IIII I
\ CHANNEL — "��. �'�\ �• --_-_------- l \ �\� \ L\�- \ ��\ -`• -- - � �`\ �``S- -�---' i--i-------/- -- --- �\` �` \ _ / \�� \\� \� \ _ r�.J� �� `�\ -�' ' /rr�'am-- /-`'`/ � �''- �' - �- {` �/j� (SHOWN (SEE \ _ \GRADING NOT
1II
\ \ �9• / , ♦///i' - ``� \ \ I
- --- \RAB SOUTH ,II
1II 1II�1IIIII IIII III /p1IIII IIII IIIII
O`\ \ \ III IIISTORMWATER \ \�Z \\_J -' / //AAB NORTH
SQ_ \� 11 III I IIII tII I
I1 EMERGENCY SPILLWAY
--- '- - \ o CHANNEL _ `--- \ STORMWATER TO BE ABANDONED
--625\ \_ CHANNEL
,i---___--- � � `\\ r \ \ -\ ` � ___- \ 1'-'/ \\� \ /'-'' \ / I \�_-___-_--_-�
O 1 `�` _ �\ \ \\`--- ----- \\ / /-_60_0-_ _ — - __------ — '/�iii'%i / / / PERMITTED SPILLWAY
CHANNEL GRADING NOT _ _
SHOWN (SEE NOTE 6) -----------=-'�`f\_--- __ -_-\-- _ _ - — - - /� f % , / /
\ ► \ / / ___ ___ _ v o 1
\ _ — �,' oo (TO BE ABANDONED)
/ / \
--------_ ----- ----------------
It�_ _ ______'
\\Iil I llrl `� l
�. 'so 1 �640 \�___--- — — ---- NORTH DIKE - ----_ - - ----- __- \\
cam, — \ \ '� t .� -�`�"� ---_ — — -- _ - ------
4 \ \ / - 1 ► \ � / . ��` =----- ---
\ — / \ / / --- NPDES
\ ` ---- TL 1A606 (100kV) \ 1� 1 \ --�� /� --- ow
TOWER 6 \ I - �� ''f'- -� IIII 111 r r I I OUTFALL
y i , r/ _---- ___- 11111111 1 1111 I IIII I
\ -ram �� _' l i - --_ _ — — - - - - , I 11; I ;1; I i;1 i SW015
(SEE NOTE 7) 11
/1\ IIj11iI1I111 I IIII I I
iIII 11 1 1 1 11 1 1 1 11 11 1 1 I I
11�1111111111�I�
wI
1----- IIIIIII iI IIIII I I;
/,%' r O IIII I IIII 1 1 COAL YARD SUMP
III III I I IIII
I; ; ; i II I DISCHARGE
I ----- / 8 11 i 11 11 I111 I I I I i (ABANDONED)
— I;�'illill IIIII III }L AAB TO RAB AREA TO BE BACKFILLED
/ \ I STORMWATER AFTER REMOVAL OF CCR
CHANNEL I / r' 11i1i111i i1i 1 1
'/ I I 11j1 111 1� I I 1
TL 1 A482 (100kV) O I I N I? II I I �`O i i �o I I
/ l i 1 (TO BE RELOCATED C° I; co I I I; cep I I (D I I
BY DUKE) �, I 11; i 11 i IIIj1 i I 1 i i l I i i I AAB EAST
ilil�lllili iiilii 11 ' STORMWATER
CHANNEL
/ ;��I ;IIfI;;;I; II; 11 I 1
O
Jill
r I 111 11 IIII I I IIIIIII I
1 J " \ -- IIII IIII IIIII 1j1 I11 I
I 4 � --- -\ \\ III11111IIII11 I IIIIIII I
1 / q \J1111 III IIIII 1j1 III
1 � \ � 11111111 IIII I IIIIIII I
❑ I TL 1A606 (10) ) 1 IIII IIII I111I 111 11
LAKE WYLIE/
I i ------ /TL 5N5 500kV \ \ t II YYY i i; I; I i i I I CATAWBA RIVER
) ( \\ \IjI�II�lIlj11 I IIIIIII
I I NORMAL W.S.E.
i1i11i1I111i1i iiilii I 565.7FT.
J \ \ \ CONCEPTUAL AAB LANDFILL "11 IIII-I!111 111 1 r
W \\ \ O IIII I 1 1 I I I I
/ r,/ - \ �\ I O FOOTPRINT/GRADING (SEE NOTE
\\ 1.2 IN GENERAL NOTES, DRAWING
CHEMICAL ' I I 10
1 , \ _, \ \1 �\ NO ALN C999.001.012) I I I I I w�
I 1 \\ _\` �\ • LDINGt �- - 11I I y O ) 1 1 I II O I I
I\\ (REMOVED) I o� I' i I i I )i i 1 j
I 1 1 1 � \ i 1 / \ \���_� \ ��__ - W �i Y I; I U) U) I 11 1 1 I \
1 I I 1 \ 1 / \ \ S� \ -- p i/ I I I Q Q 1 \ I I I I \ I
\I\ \ TL 2A10 \`\`\ O 1 _ _ I l� I ;iIII w C? I I I I I II 1 1\
(230kV)
- I I iiiili I i i i I I' 1 �\
I \ I 1 I I IIII I 1 1j1 I• 1\
I \ I 1 11 I ' �� i \\ \\ \\1 \/ \ \\ / Jill 1lillii111 i I I It 11 i \\
II II I I I I I I I 1 \
_ IIj1 �IjI �j111 11� \1\ \
1
_ \\ \i � i i ' i r' �\ \\\\\\•• � � � �.- � iIIi 1i1lljlili iIII , \\\ \
Jill Ill 11111 1
1 1 1 1 I I I I IIIII III I \\ \C�J
\ I IIII IIII IIIII IIII FUTURE STORMWATER
MANAGEMENT AREA
,/ / ► I , / I AREA TO BE BACKFILLED y 11; I I;1 i I; I I ► i I I
AFTER REMOVAL OF CCR --------
AAB WEST -/ IIIII I 111 1 111 111 \, i\
��
/ I l ( / r----- STORMWATER
CHANNEL
I , 1 IIIII�1 ,
O _ I pl 600 1't 1
C\1
111 �+-
/
0 w W ;II
O 00 pLLJLi , I
100-YEAR FLOOD
625' 1 1 j j l l I ELEVATION: 571.3 FT. I I I I I I 1 1
' / -, \ � ililli Bill IIIIIII
AAB SOUTH pw w W \\ \ i i I i I 1 i 1 1 1 1 11 1 I i I I I 1 / � � I / CONCEPTUAL DAM BREACH GRADING
00 �� a 1 IIII 11 III 1 1 1 1 1 I
STORMWATER --
/ CHANNEL .-'`------ ___ _-\ 00 _\ _ - � I IIIIIII (IIII I 1 I 1 111 � (SEE NOTE 1.3 IN GENERAL NOTES,
`\!IIIII 11 (III I 11► Ir
_ _ - 11; 11;1 IIIIIII IIIII y DRAWING NO. ALN C999.001.012)
N�III
Vow -- - � ��\ � � \ � \\/j/l/ /l I III / / \ NPDES
OUTFALL 002
PERMITTED SPILLWAY
`'%
v
(TO BE ABANDONED)
0.100,
'EXISTING
WTS PAD / \ `
'' _-' O ?S \ CHEMICAL
_.Q._O __. / � — JURISDICTIONAL STREAM
---
_ / // i / /' / / BUILDING \� 1 /
W'' (REMOVED)
kj
/// / � / � \ \ \ \I
/� / \�/ o�/,/
600
pO \\ AAB SOUTH \` \\\\ \\ J .�/ i'' /' % / ' /
STORMWATER
CHANNEL
1 If
O '�,^ J \ \ \ \ \ \_!00044j
k It
t / / /
625
- - - - 625 - - - -
ALN C999.001.026 mv. 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—YR 100 YR FLOOD LINE
— STORMWATER FLOW DIRECTION
HATCH LEGEND
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
PROPOSED AAB LANDFILL LOCATION
FUTURE STORMWATER MANAGEMENT AREA
nlnTP:c
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2. REFER TO SHEET ALN_C999.001.012 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. STORMWATER CHANNEL GRADING IN THE RAB AND NORTH/NORTHWEST PART OF THE
AAB IS NOT SHOWN ON THIS PLAN. THIS GRADING HAS BEEN CONSIDERED AT A
CONCEPT LEVEL TO VERIFY ITS FEASIBILITY AND WILL BE SHOWN AS PART OF FUTURE
DETAILED DESIGN.
7. ASH SURROUNDING TRANSMISSION TOWERS TO REMAIN AND WILL BE CAPPED AS
SHOWN ON SHEETS 032 (TYPICAL PLAN AND PROFILE) AND 039 (DETAILS).
0 200 400 600
NOT FOR CONSTRUCTION
GRAPHIC SCALE (IN FEET)
TITLE
L=com
N.C. ENGINEERING LICENSE NO.
F-0342
SEAL \\\\\t\IltttJr�/,i
p¢ •�sss/o.,�/ram+
..� -0 2;
+.
a SEAL p y f
r- 043997
:per yO t N E<1
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
SCALE: AS SHOWN DES: ANR
DUKE DWG TYPE :. DWG DFTR : AMC
ENEnt***vR® D--
ATENO 0060 720 0 ENGR : J DM
FILENAME: ALN_C999.001.025-026 FINAL GRADING PLAN.DWG
APPD: JDM
DWG SIZE
DRAWING NO.
REVISION
ANSI
22.0"x34.0"
ALN_C999.001.026
A
•
0
N
0)
INCHES 1 2 5 ITENTHS i0
1

111 1 \\\ ll 1 \11 \\\ \\�\� I \ \ \ \\
IN I \ \ rl \\ \ \ \ \ / \ \ \\ 0 1
A \ �\` ®� ALLEN STEAM STATION
OE
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r/ii' -� \ T\j \� __ 1 / /' � . /� 1 I111 �_� ft
\\ ------ I - --- T ALA RD '-'-'' \ f/ n / J �i /r./; 1i/il^,, I II /Y �� \
PLAN- - \ i i \\`1 l`/ COAL YARD 1 I II!I
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1 CDi CO I (0 ' lf�i i' �\� \ -1��a /\ \ \\ \ \ ��\�` \ -- ,J 1 / �, t�J Ilia
ww �\\ �i - \ \\\\ \ \\\ \ �_�� \ I ``\\\\�C►-=i�-��.-�- - `-�I \ O \ --Whl� \ ♦ \\ \ 1 \ \\\ \ r \ \�� ` - -
7 I
CONCEPTUAL INITIAL LANDFILL ---
FOOTPRINT/GRADING (SEE TL 1A606 \�\ `\\\�\� 1 \\\^\ `\\\ \ --' r
/ 1 NOTE 1.2 IN GENERAL NOTES, I \ 1\ \\ \ I \` \ \ _ / _---
DRAWING NO ALN_C999.001.012) ww
1 --_ I I / IIIIIIIILu
v W ' / 111\ \`�\\` \\ ---
1 J I I 1 TL 5N5 q_ ' ' 1 --`!�- \ \. — — — -------------
I" li iiji oil
-� III I I' ill
�� 1 l` - - --- \ \ �_/ l / III i I
CHANNEL GRADING NOT (500kV) i / , \ \ \ \ \\\ \ ,/ IIIIIII !IIII IIIII II
SHOWN SEE NOTE 8 / 6SO\ r� \ \I \I 1�\-� _ - \ `\\_ i� ��i� lIiAliil Ili
W 1 Ij I Ill l llff IIII I I I
W1J /' i_/' ` `\ �\ `�_ \� _ �\ 1 //' 11 fill
IIII IIII III I
0 � CD / i `\ \ `�_�____ -�� \ i I `) / 1 IIIIIII IIIII IIIIIIII
O_ �� CHANNEL GRADING NOT \ _\ \ \ I / I IIIII IIII II III I
- - - / - ---_- - TL 2A10 -' .' SHOWN (SEE NOTE 8)
�-�' `\ \ I / /// �----'i'%IIII IIII IIIIIIII (
I I I (230kV) `\ ) % i/i i ' /'� -'1 IIIII IIII IIII III
\� �--\----------
I w
I 1 ' ' �\ W
I / / �\ / \ . / J I II I II I I I
�- � '/ %1 ' �/ / / / i � Ijl IIII III IIII
� ♦' _-� --- �� ,,i . // r / III IIII IIII III I
I I I Jl \ Zg• ___'� \\ \\ /' -- - \\\__ -_ ♦' / �'' /'/ /' /' / , I o II N ,oil
\ \Il \ \\ � �} � i--���-�' — � — ��i��'/' I j �6j/ ♦' ICI I��I il�jl�l j
^�} I W
S \\ \ \ �- ✓ / / / /'' i /� /'� / I IIII IIII II I
\ \\ ♦ fit. \ \� \ ` ��LLJ
c \\ \ r[� �_ \ ` \ \\ \� � � � �• r^\ �-------'' �-- i / / / / '/ i'�i I II III III I
C�.O � �__
-------6-j- \ �S= 'EX) 1
ICI II I IIII
�• -�\
j \\`�J,_l�_ �_ \\�\ �_�--- _ \�\ ��r'--� / __` \` \ \ /_\� `\ `` �\ -'' \�'`-�� .•. + �i /'//i/' _--� `\�\ I II IIIII IIIIIII I
\ ' _ _� ) \` \ _ _-- . TL 1A482 i�� / \ \ `\\ I II III�II�IIiI�I
, \\ \\ _ L
N \` - ' \ \ Jr.-_\\ ` LJ_IJ _ ` \\ ��iy/ I / I \` \\ __ _ _� _ill/I /I
' 1 ----� `�-------\ \\ ," \ -===ice �\ \.' / 1 `�__-\ ---- //// /
Q CHANNEL GRADING NOT �-------�_-___�
T \ \/ - r' i,.\_ - \\--'\ SHOWN (SEE NOT 8) ____ -- __--t==---- _ _- _ � 62 pp` ---D_ ^l��l� 1 /
1 ---- _ _ '
\ 5- B N RTco
H �K 'a r/o ✓ r l
I i \ \ �' 1 / liir IiIIII�IiNiiil� I I
II.-
III
l
RETIRED ASH BASIN DIKE
(GASTO-016)
CONCEPTUAL DAM BREACH GRADING
(SEE NOTE 1.3 IN GENERAL NOTES,
DRAWING NO. ALN_C999.001.012)
PROPOSED DETENTION BASIN
2-36" CULVERT OUTLETS. INLET ELEVATION 566.0 FT.
EMERGENCY SPILLWAY ELEVATION 581.0 FT.
LAKE WYLIE/
CATAWBA RIVER
NORMAL W.S.E. 565.7 FT.
100-YEAR
FLOOD
ELEVATION:
571.3 FT.
EMERGENCY SPILLWAY
(TO BE ABANDONED)
625
--62!
ALN C999.001.027 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
APPROXIMATE ASH BASIN WASTE BOUNDARY
�•••LIMITS OF WATER
100—YR 100 YR FLOOD LINE
— STORMWATER FLOW DIRECTION
0
PERMITTED SPILLWAY
(TO BE ABANDONED) NOTES
NPDES
OUTFALL
SWO15
\ _ _ ' r /' II�IIIII�NIIiIi Iil COAL YARD SUMP
/�, (IIIIIIII IIII III DISCHARGE
./ III IINIIIII I I I
I //7 Iliiiliii,.11ll� II (ABANDONED)
00
6�Lp / I I IIII III I I 11
O I I I I I INI I I I I ( I I I I I 1
° , ' '' � /__ — ---__ `�•iili!!tl��ili IIIIIII
O to O U3 O I, `IIIIIII III
- -1 0000 coOI� P.-P.-1- w �O W I I I I Y^ ( I I I I I II
p --P ^ i I \IIIII c~n o I I I II I I
CONCEPTUAL AAB LANDFILL \ lilt Q Ili ill I '
FOOTPRINT/GRADING (SEE I\IIII w IIIIIII
Q
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PROPOSED DETENTION BASIN
2-20" CULVERT OUTLETS. INLET ELEVATION 566.0 FT. 1�T
EMERGENCY SPILLWAY ELEVATION 581.0 FT. 1�
CONCEPTUAL DAM BREACH GRADING
(SEE NOTE 1.3 IN GENERAL NOTES,
DRAWING NO. ALN_C999.001.012)
1
JURISDICTIONAL STREAM
LAKE WYLIE
100-YEAR
FLOOD
ELEVATION:
571.3 FT.
- NPDES
OUTFALL
002
PERMITTED SPILLWAY
(TO BE ABANDONED)
JURISDICTIONAL STREAM
HATCH LEGEND
WETLAND (SEE NOTE 4)
POTENTIAL HABITAT - SCHWEINITZ'S
SUNFLOWER (SEE NOTE 3)
PROPOSED DETENTION BASIN
1. LIMITS OF IMPOUNDED ASH ARE APPROXIMATE.
2. REFER TO SHEET ALN_C999.001.012 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
D
AREAS.
r
z
4. POTENTIAL JURISDICTIONAL WATERS (STREAMS/WETLANDS) WERE IDENTIFIED BY
I
AMEC'S JUNE 24, 2015 NATURAL RESOURCES TECHNICAL REPORT AND SURVEYED BY
n
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.
Q
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.
O
N
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
CCR MATERIAL. A SEPARATE NEW BERM WILL BE BUILT AROUND THE FUTURE
STORMWATER MANAGEMENT AREA FOR LONG-TERM STORMWATER TREATMENT.
8. STORMWATER CHANNEL GRADING IN THE RAB AND NORTH/NORTHWEST PART OF THE
AAB IS NOT SHOWN ON THIS PLAN. THIS GRADING HAS BEEN CONSIDERED AT A
CONCEPT LEVEL TO VERIFY ITS FEASIBILITY AND WILL BE SHOWN AS PART OF FUTURE
•
DETAILED DESIGN.
0 300 600 900
LAKE WYLIE/ NOT FOR CONSTRUCTION
CATAWBA RIVER
NORMAL W.S.E. GRAPHIC SCALE (IN FEET)
565.7 FT. TITLE
FINAL SURFACE WATER MANAGEMENT PLAN
A=COM
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F-0342
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FOR ISSUED FOR APPROVAL
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SCALE: AS SHOWN
DES: ANR
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III II ( )
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_,'� l \ // i/ /;' `\ `.\ `\ \ ` �' /� /I�IIII� I'I lil 1 1 62C EXISTING MAJOR CONTOUR 25 FOOT
--- --' \ / [ li, \ \ \ �� ` `\ \ \\� / 1 IIII I'll I )
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I / _ jj
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e- �`----------' �''-----'' \`l I % ' � -/ IIIII Illj IIIIIIII
'- O/ ���� / �/ / IIII IIII IIII 11 I DUKE ENERGY PROPERTY BOUNDARY
I / - I �� ��// h / ��' �' / IIIII I�I1111111 I
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PROPOSED UNPAVED ROADS
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575 034 I
NOT FOR CONSTRUCTION
IN. 017
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IIII 0 TITLE
�O FINAL CLOSURE GRADING CROSS
l r
t\ \
, \ \ SECTION LAYOUT PLAN
65 ` ` '. , \ \` �`''� ', �,'/ _ _ _ _'�''''/�j/ ' \ ` ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
LAKE WYLIE/ CATAWBA
` \` _ _ ' , /'/ ' '/ ' ' ,' 1 I \ t �I // \\ ` RIVER N.C. ENGINEERING LICENSE No. FOR
\ ---' - � '" / / ISSUED FOR APPROVAL
\\ _-W- - - r_ / , ,, // / //' `�i\ 6 ✓� ,' I F-0342
-- NORMAL W.S.E. 565.7 FT
`� 675� `` / ! / / / / / \ \ r / SEAL \l11llill/
r� / )\\ //,�/ r SCALE: AS SHOWN DES: ANR
I - I CA /• DUKE
`\ � �i' DWG TYPE:. DWG DFTR: AMC
_ ��SS7o'• i JOB N0: 60603204 CHKD: JDM
o ! I M ENrRGY,I ` \ / ! . / /.- . / SEAL p =_ ;q _ DATE: 01 -27-20 ENGR: JDM
\\� % i i ' / r -� /i c_ 043997 r:
FILENAME: ALN G999,001,028
\-038 FINAL GRADING CROSS SECTIONS,DWG APPD: JDM
I`\ \ \`\\ :per . GIN E e
N\ \\\` \\ \\ 4
\\ _ _ _ f \ \ % /,�' \\ \�\ �, / DWG SIZE DRAWING NO. REVISION
ANSI D
; --_ ALN C999.001 .028 A
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INCHES 1 2 3 TENTHS 10 20 30 4 � I � 8 9 1 0
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CD
I

ALN C999.001 .029
mv• A
720
710
700
ON
.:E
670
.o
650
MR
630
620
610
mm
590
:R
570
560
c
c
c
KEY MAP
INCHES
TENTHS i0
0
n
r
V rh.. V ■ ■ V■ Is N ` N ` L/-1 V V I L I Y V V ­. I
nl()TP:C
LEGEND
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
EXISTING GRADES
2. THE INTENT IN BREACHING THE RAB AND AAB DIKES IS TO REMOVE THE DIKES FROM REGULATION AS
HISTORICAL GRADE (BOTTOM OF CCR MATERIAL) DAMS. THIS WILL BE ACCOMPLISHED BY PERFORMING A FULL LOCAL BREACH, I.E. TO REMOVE A PORTION
PROPOSED FINAL GRADES 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.
PROPOSED SOIL FILL
3. THESE PLANS DO NOT INCLUDE DAM BREACHING. SPECIFIC PLANS FOR THE WORK WILL BE SUBMITTED AT
A LATER DATE.
PROPOSED ASH FILL
REFERENCES
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
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.
0 15 30 45
VERTICAL SCALE (IN FEET)
0 150 300 450
HORIZONTAL SCALE (IN FEET)
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
ISSUED FOR APPROVAL
F-0342
SEAL ``�xx11I1i1jjjj
CAr�0,j���
DUKE
SCALE: AS SHOWN
DES:
ANR
,��Q.-e\\A
DWG TYPE:.DWG
DFTR:
AMC
o�tiSSio•, i�• f
��
JOB NO: 60603204
CHKD:
JDM
SEAL p: y -
ENr-rlfm'*Y®
DATE: 01 -27-20
ENGR:
JDM
c_ :a 043997
;per �,
FILENAME:
ALN_C999,001,028-038 FINAL GRADING CROSS SECTIONS.DWG
APPD:
JDM
f�Etie:'
� ���`�
DWG SIZE
DRAWING NO.
REVISION
Q
ANSI
ALN C999.001 .029
A
9
1
10
1

ALN_C999.001.030
FEv• A
—F--4
690
5N5 500kV) TRANSMISSION LINE AG ELEV TIONS ---
(SEE R r
FERENC 5, THISSHEET) -�O O
680
2A10 (230kV) TRANSMISSION LINE SAG ELEVATIONS —�
(SEE RI=FERENCE 5, THIS SHEET)
670 - -
1A606 100kV) TRANSMISSION LINE SAG ELEVATIONS -I O
(SEE REFERENCE 5, THIS SHEET)
660
PRE -DECANTING GROUNDWATEF: LEVEL
(SEE: REFERENCE 4)
O
650
RAB SOUTH STORMWATE R CHANN EL EXISTING GRZADE
640 /
630 �--�
620 _
_ HISTORIC G AIDE
\ 610 AAB WEST STORMWATER
_ —
CHANNEL CONNECTION
600 \ _ — _
590
580
570
560
550
1A482 (100kV) TRANSMISSION LINE MAX. SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET)
O
O 0 0 0 0 0 0 O O O 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 0 0 0 0 O O O O 0 0 0 0 0 0 0 O
+ + + + + + + + + + + + + + + + + + + + + + + + + +
O N r7 u') (D r- 00 m O N ro U) (o r- CC) m O N r7 Lo
N N N N N N
LEGEND SECTION B-BI
tXIJ 1 IINU UKAUtJ
- - - - - - - - - -
HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
n8wPROPOSED
SOIL FILL
PROPOSED ASH FILL
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
NOTES
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
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.
RAB DIKE BREACH
(SEE NOTE 2)
I
I
100-YEAR FLOOD ELEVATION: 580.7' I I
� h
25-YEAR FLOOD (ELEVATION: 576.2' I 1
I 1
POND BOTTOM 566.0' I 1
1
1
1
I
PROPOSED RAB STORMWATER
DETENTION POND
(DETAILED DESIGN TO BE PROVIDED
WITH CONSTRUCTION LEVEL DRAWINGS)
SOIL FILL ABOVI E HIS( ORIC 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 0 O O 0 O 0 0 0 0 O O O o 0 0 0 0 O 0 0
+ + + + + + + + + + + + + + + + + + + + + + +
cD r- 00 rn O N r7 Lo cD r- 00 C>7 O N r7 Ln CO 00
N N N N M r7 r7 r7 n n n n M M � �t �t �t �t �t
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS II
AECOM ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
KEY MAP
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO.
FOR
ISSUED FOR APPROVAL
F-0342
0 15 30 45
SEAL ``\\%IItlttlf��
�\�N CA/�0�,,��
DUKE
SCALE: AS SHOWN
DES: ANR
DWG TYPE:. DWG
DFTR: AMC
: - �ESS1a " , f
JOB NO: 60603204
CHKD: JDM
VERTICAL SCALE (IN FEET)
F z :'a SEAL p : y �_
ENFNSY®
DATE: 01 - 27 - 20
ENGR : JDM
043997 r-
'.�,y
0 150 300 450
= v �e :'
� I- •..
FILENAME: ALN C999,D01,028 038 FINAL GRADING CROSS SECTIONS,DWG
_
APPD: JDM
G! N E O �.
A\ �
DWG SIZE
DRAWING NO.
REVISION
HORIZONTAL SCALE (IN FEET)
ANSI D
22.0"x34.0"
ALN C 9 9 9.0 01 ■ 0 3 0
A
INCHES 1 2 3
TENTHS 10 20 30 4 5 6 7 8 9 1

ALN C999-001.031
mv' A
670
..W
650
640
630
620
610
.ok
590
580
PRE -DECANTING GROUNDWATER LEVEL
(SEE REFERENCE 4)
EXISTING
GI
HISTORII
I
\
AAB
TO RAB STORMWATER CHANNEL
:_IT5
O 0 0 0 O O O O 0 0 O O O O 0 0 00
O 0 0 0 O o 0 0 0 0 o O o O 0 0 n
+ + + + + + + + + + + + + + + + +
O r N ro U O 00 m O N 117 "t Ln U-)
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.
SECTION C-C'
GRADE
VM .�• ul.
Z�I��
aN
I
_/l
F hat\
t, LAO 1 a iF
I r r
66140
r t %4'-
1 � 1 �_!F}����,��� J �:
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I
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yi
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•1�A�'��
4-
KEY MAP
LEGEND
EXISTING GRADES
HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
PROPOSED SOIL FILL
PROPOSED ASH FILL
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
ninTP:c
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
AECOM
SEAL
0 15 30 45
VERTICAL SCALE (IN FEET)
0 150 300 450
HORIZONTAL SCALE (IN FEET)
N.C. ENGINEERING LICENSE NO.
F-0342
oxxX'CIA rR0���'�
FEss/O•.��•�''�1
E ;' SEAL v : y
c_ 043997
:per GIN-
0
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NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS III
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS -
GASTON COUNTY, NORTH CAROLINA
CBE
FOR ISSUED FOR APPROVAL
DUKE
ENEM11Y®
SCALE: AS SHOWN
DES:
ANR
DWG TYPE:.DWG
DFTR:
AMC
JOB
CHKD:
JDM
DATE, 0060�200
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
I 1
INCHES
THS 10

ALN C999.001.032
mv• A
IT
r-
m
D
0
z
INCHES
SECTION D-D' - PLAN
680
5N5 (500kV) TRANSMISSION LINE SAG ELEVATIONS
670 - (AT -745', NOT SHOWN) (SEE REFERENCE 5, THIS SHEET)
650
EXISTING GRADE
640 -- -�
630
620
25 FT OFFSET
FROM TOWER LEG
TO PROP. GRADING I
�J
xx
GRILLAGE FOUNDATION
(TYP.; NOT TO SCALE;
2A10 (230kV) TRANSMISSION LINE SAG ELEVATIONS
(AT -705', NOT SHOWN) (SEE REFERENCE 5, THIS SHEET)
TRANSMISSION TOWER (TYP.; NOT TO SCALE)
GEOSYNTHETICS TO CONCRETE 5
FOUNDATION CONNECTION 39
— TYPICAL FINAL COVER G
_ CAP SYSTEM 39
Qy -
71, PROPOSED GRADE
(SEE NOTE 2) — --— — — —
HISTORICAL GRADE
PRE -DECANTING GROUNDWATER LEVEL
(SEE REFERENCE 4)
STATION
SECTION D-D' - PROFILE
O
O
N
TYPICAL 7
ANCHOR
TRENCH 39
625
----625--
r
O
O .
m
100-YR
0
M
Nm
0
m
0
M
I
I
PLAN 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
APPROXIMATE ASH BASIN WASTE BOUNDARY
LIMITS OF WATER
100 YR FLOOD LINE
0 30 60 90
GRAPHIC SCALE (IN FEET)
KIn_=c
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
2. THE LIMITS OF EXCAVATION AND SLOPES SURROUNDING THE TRANSMISSION TOWER BASE IS SUBJECT TO
STABILITY REQUIREMENTS AS DETERMINED BY DETAILED STRUCTURAL AND GEOTECHNICAL ANALYSES TO
BE PERFORMED AT A LATER DATE.
3. IN ACCORDANCE WITH THE SETTLEMENT AGREEMENT BETWEEN DUKE ENERGY AND NCDEQ (EFFECTIVE
DATE 12/31/19), ASH WILL REMAIN FOR STRUCTURAL STABILITY PURPOSES AROUND THE GRILLAGE
FOUNDATIONS OF THE OVERHEAD TRANSMISSION LINE SUPPORT TOWERS CURRENTLY LOCATED WITHIN
THE RAB. ASH TO REMAIN AROUND THE SUPPORT TOWERS IS AND WILL CONTINUE TO BE UNSATURATED
BASED ON COMPARING HISTORICAL BOTTOM OF ASH ELEVATIONS AND GROUNDWATER ELEVATIONS. THE
ESTIMATED VOLUME OF ASH TO REMAIN AROUND THE SUPPORT TOWERS IS APPROX. 20,000 TONS (16,600
CUBIC YARDS). ASH IN THESE AREAS WILL BE CAPPED WITH GEOMEMBRANE.
PROFILE LEGEND
EXISTING GRADES
- - - - - - - - - - - - - HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
PROPOSED SOIL FILL
EXISTING ASH TO REMAIN
PRE -DECANTING GROUNDWATER
0 7.5 15 22.5
O VERTICAL SCALE (IN FEET)
O
0 30 60 90
HORIZONTAL SCALE (IN FEET)
KEY MAP
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.
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS IV
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
DWG TYPE :. DWG
DFTR :
AMC
C A Rj�,,�'
DUKE
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'Q1sSS70••
JOB N0: 60603204
CHKD:
JDM
SEAL v:: y f
ENFlk%J To
DATE: 01 -27-20
ENGR:
JDM
c_ :4 043997 -
;p =�,y
'.,GENE,.'
FILENAME:
ALN C999.001.028-038 FINAL GRADING CROSS SECTIONS.DWG
-
APPD:
JDM
-
i 40 �
DWG SIZE
DRAWING NO.
REVISION
ANSI
ALN C999 - 001 - 032
A
9
1
10
1

ALN C999.001 .033
ay. A
LEGEND
—
EXISTING GRADES
- - - - - - - - - - - -
- HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
PROPOSED SOIL FILL
_
PROPOSED ASH FILL
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
\ 1 r\ T r r\
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
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
TENTHS 10 20 30
710
700
690
680
670
660
650
640
630
620
610
O O O O O O O O O O 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 O O O O O O
O + N r7 LO
O ± N r0 � Ln O 1,-00 O
670
FREE WATER PRIOR TO DECANTING
650 '
EXISTING GRADE
640
630
620 '1
1
1
610
1
11
600
1
590
580
570
SECTION E-E'
TO BE RELOCATED
00___� 1A482 (100kV) TRANSMISSION LINE MAX. SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET)
PRE -DECANTING GROUNDWATER MODIFIED
IN AUTOCAD CROSS SECTION TO ACCOUNT '
FOR ARTIFACTS CAUSED BY LIMITED
RESOLUTION OF GRID SIZE/SPACING
IN MODFLOW 3D
AAB EAST STORMWATER CHANNEL
CLEAN FILL ABOVE HISTORIC GRADE
560
0 0 0 0 0 0 0 0 0 0 0
O O O O O O O O O O 0
+ + + + + + + + + + +
O N r7 d Ln co I\ c0 m 0
SECTION F-F'
FREE WATER PRIOR TO DECANTING
I �
HISTORIC GRADE
/ IN, _
100-YEAR FLOOD ELEVATION: 580.1' -
25-YEAR FLOOD ELEVATION: 576.1'
PROPOSED AAB STORMWATER DETENTION POND
(DETAILED DESIGN TO BE PROVIDED WITH
CONSTRUCTION LEVEL DRAWINGS)
o 0 o O O
O O O O O
N r7 � Lo co
rd
\-
033 \� \
033 F
r
0\ F•
KEY MAP
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
0 0 ( SECTIONS V
r- 00 00L=com ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS - CBE
GASTON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO.
F-0342
0 15 30 45 SEAL `` 111111111////'
4�SSjo• < �.•'''�
VERTICAL SCALE (IN FEET) SEAL p : y
043997`�'�`
0 150 300 450
O 1 N
HORIZONTAL SCALE (IN FEET)
� 27 2.0
FOR
ISSUED FOR APPROVAL
DUKEDWG
E N F qkGY ®
SCALE: AS SHOWN
DES:
ANR
TYPE:.DWG
DFTR:
AMC
O 60
720
DATE: 01 0
ENGR :
J DM
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 - 033
A
10
1
I
0
w
w

ALN C999.001 .034
Ru• A
ME
.:E
670
0
650
640
630
620
610
590
580
570
560
550
O
0
O
2A10 (230kV) TRANSMISSION LINE SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET)
51\15 (500kV) TRANSMISSION LINE SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET) O
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
AAB WEST STORMWATER
\
\
CHANNEL CONNECTION
1
PROPOSED AAB STORMWATER 1
AAB
SOUTH STORMWATER
CHANNEL
DETENTION POND -. • • - r • - • - • • ..
SOIL FILL ABOVE
HISTORIC
GRADE
(DETAILED DESIGN TO BE PROVIDED \
WITH CONSTRUCTION LEVEL DRAWINGS)
ARMORED LETDOWN
t
25-YEAR FLOOD ELEV: 576.1'
100-YEAR FLOOD ELEV: 580.1'
O O 0 O
0 0 0 0
LEGEND
O O O O O 0
O 0 0 0 0 O
Ln (o 00 O O
—
EXISTING GRADES
- - - - - - - - - - - -
- HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
PROPOSED SOIL FILL
_
PROPOSED ASH FILL
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
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 1 2 3 TENTHS 10
0 0 0 0 0 0 0 0 0 0 0
o O O O O O O O O O O
+ + + + + + + + + + +
N r0 O c0 I� 00 ON N
,k'
SECTION G-Gil
/ /
. o � '�\�`> • dui
KEY MAP
G'
034
0 0 0 0 0 0 0 0 0 0 0
O O O O O O O O O O O
+ + + + + + + + + + +
N M Ln c0 � 00 O O N
N N N N N N N N r"� r"�
670
660
r FREE WATER PRIOR TO DECANTING
650
640
4 il
L
630
620
AAB DIKE BREACH -
(SEE NOTE 2)
610
ME
590
If
580
570 '
1
0 0 0 0 0 0 0 0 0 0
O O O O O O O O O O
+ + + + + + + + + +
r� `t Ln c0 � 00 O O N
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.
I� 1 PRE -DECANTING GROUNDWATER LEVEL
I (SEE REFERENCE 4)
1 �
If0 15 30 45
1 �
1 VERTICAL SCALE (IN FEET)
1 �
1 0 150 300 450
I ` PROPOSED STORMWATER DETENTION
I POND BERM (SPILLWAYS/CULVERTS
I 1\ NOT SHOWN) HORIZONTAL SCALE (IN FEET)
NOT FOR CONSTRUCTION
TITLE
560
4
OUTLET CULVERT/
CHANNEL
J
PROPOSED AAB STORMWATER
DETENTION POND (POND BOTTOM 566.0')
550
0 0
0
0
0 0 0
O O
O
O
O O O
+ +
+
+
+ + +
SECTION
G-G'
(CONT'D.)
FINAL CLOSURE GRADING CROSS
SECTIONS VI
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 0XI111111111t1l,
CA0�4�'
DUNCE
SCALE: AS SHOWN
DES: ANR
0 0
`
�''.
DWG TYPE:.DWG
DFTR: AMC
JOB NO: 60603204
CHKD: JDM
+ +
p Es$/' 0. 1
��
ti
SEAL V' y
- ENFRv 7Y®
043997 '-
DATE: 01 -27-20
ENGR: JDM
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FILENAME: ALN C999.001,028-038 FINAL GRADING CROSS SECTIONS.DWG
AP JDM
41 ���
Kp
DWG SIZE
DRAWING NO.
REVISION
p
ANSI
22.0"x34.0"
ALN C999 - 001 . 034
A
8 9 10
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
630 \ -
\ PRE -DECANTING GROUNDWATER LEVEL
(SEE REFERENCE 4)
620 ��
610
CLEAN FILL ABOVE
HISTORIC GRADE
L
/
�
t e'
MEN
ME
•
; oil' ilitaj
,�
WIN —b—
ON
'�.
SECTION H-H'
KEY MAP
LEGEND
EXISTING GRADES
HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
PROPOSED SOIL FILL
PROPOSED ASH FILL
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
nInTCC
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
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.
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
ISSUED FOR APPROVAL
F-0342
0 15 30 45
SEAL XXXIIIINIIIII/
SCALE: AS SHOWN
DES: ANR
DWG TYPE:.DWG
DFTR: AMC
`` C'iafyO���
DUCE
JOB N0: 60603204
CHKD: JDM
VERTICAL SCALE (IN FEET)
i :'z SEAL p : P
ENFlk%JY®
= :4 r-; =
c_ . 043997
DATE: 01 -27-20
ENGR: JDM
FILENAME: ALN C999.001.028-038 FINAL GRADING CROSS SECTIONS.DWG
APPD: JDM
0 150 300 450
­y
40 Al \`�
O
DWG SIZE
DRAWING NO.
REVISION
� Q K
HORIZONTAL SCALE (IN FEET)
27
ANSI D
22.0"x34.0"
ALN C999 - 001 . 035
A
TENTHS 10 20 30 4 5 6 7 8 9 10
D
z
CD
CD
CD
0
0
W

ALN C999.001.036
LEGEND
Ru• A
820
810
:••
790
780
770
760
750
740
730
720
710
700
.••
•i•
670
• • •
650
640
630
620
•
ie
590
580
INCHES
0 0 0 0 0 0 0 0 o O O
O O
N r0 t Lo O I,- 00 O
SECTION 1-1'
TENTHS 10 20 30
O O O O O O O O O O O
O O O O O O O O O O O
+ + + + + + + + + + +
N r0 � L0 (.0 r- 00 0) N N
A I r1 T r C1
O O O O O O O
O O O O O O O
L 00
N N N N N N N
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
O o �
O O c0
O M
EXISTING GRADES
- - - - - - - - - - - - - HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
PROPOSED SOIL FILL
PROPOSED ASH FILL
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
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.
J
CD
CD
_/� ),ICE
p1
r,' III 0
11\III 0*)
b;llll I
All
I I
NI
NN
I lam\\\III
N
KEY MAP
AcCOM
SEAL
0 15 30 45
VERTICAL SCALE (IN FEET)
0 150 300 450
HORIZONTAL SCALE (IN FEET)
N.C. ENGINEERING LICENSE NO.
F-0342
Q SEAL p : P
c_ 043997 7;
:per INEti�
�2720
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS VIII
ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS -
GASTON COUNTY, NORTH CAROLINA
CBE
FOR
ISSUED FOR APPROVAL
ribb-
DUKE
ENEKWY®
SCALE: AS SHOWN
DES:
ANR
DWG TYPE:.DWG
DFTR:
AMC
JOB
CHKD:
JDM
DATE: 01 - 7- 0
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 C999.001.036
A
I
10
1
0
1
D

FEv• A
INCHES
820
810
:•-
790
780
770
760
750
740
730
720
710
700
.:-
670
650
640
630
620
610
.•-
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 AAB LANDFILL FOOTPRINT/GRADING
(SEE NOTE 1.2 IN GENERAL NOTES, DRAWING NO.
ALN_C999.001.012)
I
PRE -DECANTING GROUNDWATER LEVEL
(SEE REFERENCE 4)
SOUTHPOINT RD APPROX. ELEV. 671'
(NOT SHOWN - APPROX. 1,790 FT FREE WATER PRIOR TO DECANTING
WEST OF STA 0+00)
I
\
r
EXISTING GRADE
1
1
1
\
HISTORIC GRADE
'
-\A
AAB
EAST STORMWATER
CHANNEL
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 14) � In co � 00 O O N
ENTHS
0
O O O O
O O O O
Lo O
SECTION J-JI
O O O O O O O O O O O 000
O O O O O O O O O O O O—
+ + + + + + + + + + + ++
I1_ 00 O O N ro Lr) O r- 0000
N N N N N N N N NN
A 1 /1 T r r1%
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED ON NAVD88.
ALN C999.001.037
LEGEND
EXISTING GRADES
— — — — — — — — — — — — — HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
PROPOSED SOIL FILL
PROPOSED ASH FILL
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.
230 KV
24.5 FT.
500 KV
30.5 FT.
�/ tl
�i����iJ� IIg5;- lit
I
01
�1
l
KEY MAP
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS IX
P"=com ALLEN STEAM STATION
CCR SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS CBE
SEAL
0 15 30 45
VERTICAL SCALE (IN FEET)
0 150 300 450
HORIZONTAL SCALE (IN FEET)
N.C. ENGINEERING LICENSE NO.
F-0342
``,ltlt11I111//�//
N C A Rp��'�.
.'4 SEAL
043997
• GINE
r272.0
GASTON COUNTY, NORTH CAROLINA
FOR ISSUED FOR APPROVAL
SCALE: AS SHOWN DES: ANR
DUKE
DWG TYPE:. DWG DFTR: AMC
JOB NO: 60603204
CHKD: JDM
`/e ENEnmGY® DATE: 01 -27-20 ENGR: JDM
FILENAME: ALN C999,001,028-038 FINAL GRADING CROSS SECTIONS.DWG APPD: JDM
DWG SIZE DRAWING NO. REVISION
ANSI D
22.0"x34.0" ALN C999 - 001 . 037 A
1) 10
1

ALN C999.001 .038
mv• A
INCHES
LEGEND
EXISTING GRADES
— — — — — — — — — — — — — HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
PROPOSED SOIL FILL
PROPOSED ASH FILL
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
ninTrc
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.
500 KV
30.5 FT.
TENTHS j0 20 30
630
620
610
.1•
590
580
570
565
O
0
O
0 O O O
O 0 0 0
SECTION K-KI
CVIQTIAIf1 t-ro
■
CONCEPTUAL DAM BREACH GRADING
(SEE NOTE 1.3 IN GENERAL NOTES,
DRAWING NO. ALN_C999.001.012)
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_C999.001.012)
SECTION L-LI
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS X
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 `XXXIIIttI>>I,/i
�-.
SCALE: AS SHOWN
DES: ANR
DWG TYPE:.DWG
DFTR: AMC
0 15 30 45
�¢,`� C/af�O���
DUKE
o�tiSSio•,
%1@
JOB NO: 60603204
CHKD: JDM
: n. SEAL =' = y =
ENPR (3+
VERTICAL SCALE (IN FEET)
DATE: 01 - 27 - 20
ENGR : JDM
0 150 300 450
c 043997
•�NO
FILENAME: ALN_ C999,001,028-038 FINAL GRADING CROSS SECTIONS,DWG
APPD: JDM
IN Eti , O ��
.1 40 Al .`�
DWG SIZE
DRAWING NO.
REVISION
� 2•]
ANSI D
22.0"x34.0"
ALN C 9 9 9.0 01 ■ 0 3 8
A
HORIZONTAL SCALE (IN FEET)
8 9 10
1 1 1

ALN C999.001 .039
Fm►. A
TEXTURED 40-MIL
LLDPE GEOMEMBRANE
EXTEND GEOTEXTILE 3" MIN.
DOWN CONCRETE FACE
COMPACT MATERIAL
ADJACENT TO CONCRETE
16 OZ. NON -WOVEN
GEOTEXTILE
INCHES
q_
CHANNEL
LOW POINT
STORMWATER 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
- NOT TO SCALE
NOTES:
1. CHANNEL SECTIONS SHOULD INCLUDE A MINIMUM 2% GRADE TOWARD THE CENTERLINE OF THE CHANNEL.
STAINLESS STEEL BATTEN
2
3" MIN ALL SYNTHETIC COMPONENTS TO
BE EXTENDED THROUGH BATTEN
TOP OF CONCRETE
FOUNDATION/POURED SLAB
D
D
0
0
0
D
� D �
1" CHAMFER (TYP.) ALL
CONCRETE CORNERS IN
CONTACT WITH LINER
D
NEOPRENE GASKET
v D
v
0 0
D
i"O X 34" STAINLESS
STEEL CINCH TYPE
ANCHOR BOLT AT 6"
ON CENTER
� D
GEOCOMPOSITE —
FINAL COVER
SYSTEM TEXTURED 40-MIL
GEOSYNTHETICS LLDPE GEOMEMBRANE
GEOSYNTHETICS TO CONCRETE FOUNDATION CONNECTION (TYP.
NOT TO SCALE
NOTES:
1. IF A CONCRETE FOUNDATION DOES NOT EXIST AT
GRADE, A 6 INCH THICK CONCRETE PAD SHALL BE
POURED AT GRADE, EXTENDING A MINIMUM OF 1 FOOT
HORIZONTALLY IN ALL DIRECTIONS BEYOND THE
TOWER LEGS.
2. CONTRACTOR MAY SUBMIT FOR ENGINEER APPROVAL
ALTERNATE METHODS FOR ATTACHING CAP SYSTEM TO
TOWER LEGS.
TENTHS i0
0
VEGETATIVE COVER
6" TOPSOIL/AMENDED
COVER SOIL
TYPICAL FINAL COVER CAP SYSTEM
NOT TO SCALE
2'
24" CAP SYSTEM
COVER SOIL
GEOSYNTHETICS
5' MIN
2' MIN /' 3' MIN
PROPOSED 2 FT. X 2 FT.
2' MIN ANCHOR TRENCH
rY TYPICAL CULVERT
NOT TO SCALE
(L rL
ROADSIDE ROADSIDE
DITCH DITCH
CCR MATERIAL
7 TYPICAL ANCHOR TRENCH
032 NOT TO SCALE
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.
GENERAL NOTES:
1. DETAILS 1 THROUGH 4 REPRESENT TYPICAL CLOSURE
DETAILS AND SHOULD NOT BE BUILT ON CCR MATERIALS.
2. DETAILS 5 THROUGH 7 APPLY TO LOCATIONS WHERE
BASES OF TRANSMISSION TOWERS WITHIN THE ASH
BASIN ARE FOUNDED ON OR SURROUNDED BY CCR
MATERIAL WHICH WILL BE LEFT IN PLACE AND CAPPED.
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING DETAILS
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 ``0XIItttrr>>�� SCALE: AS SHOWN DES: ANR
�� CA�0�j����� DUKE DWG TYPE:.DWG DFTR: AMC
p oF�CSsi�•, i�, f JOB N0: 60603204 CHKD: JDM
�. ENERGY®
Q' SEAL p = Y DATE: 01 -27-20 ENGR: JDM
c_ : a 043997 '�
:p �,y tiQ:' tt FILENAME: ALN C999.001 .039 FINAL GRADING DETAILS.DWG APPD: JDM
'•.GINS,.' p -
' .. ' ' �`� DWG SIZE DRAWING NO. REVISION
' w0y, ANSIDALNC999.001.039 A
� 22.0"x34.0"
9 10
1 1
r�
•
0
W
0

\ki \
111 l \A\
If
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`\\kli �yI `\\\ / ,� !V J r \\ \ \ E` \ p�E Q 1 I
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c9 c0 ►- I- O o _��� I ; `\ II `-IL ``NJ�\l \\�` I \` i I \\' �-- -/ ___�===_ -_=____=
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e I I !/ ; Ow p 111\\\ \\ \// / /�} 1 II IIIIII `
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f77717 '+\ p , 1 2 Oi �+ �0� 1 1 ter'
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\ \ \_,
1 \I 1�1I�� 1 II
FOOTPRINT/GRADING SEE NOTE
• _�
1.2 IN GENERAL NOTES, DRAWING _ . • �� \ +'ram --� A�-��
NO. ALN C999.001.012------ / I / ("` ` '1 L I I II I I
_ > I � �� � / I � �' LL'-,, � . LL\� ��� y \ �=��s�a-i��r������ �i�'i II IIII
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------- \ r�, �� �`� \ �. �.t���.s- --_ __ - _ -\ = 11j r r TL 1A482 (100kV) -
\IIIII IIII irl I CONCEPTUAL RELOCATION
co 1 \ /� \ `- I III , II IIII I I r I AROUND AAB LANDFILL
I '. .'' � / 1IIII I I 11 I I
lee/'•�I lii iIl i IIIII iiI
. I� I I III
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CONCEPTUAL AAB LANDFILL
o �� III II IIiI� ii �II
,0 /. � FOOTPRINT/GRADING (SEE NOTE
1.2 IN GENERAL NOTES, DRAWING
o _! o c\s NO. ALN_C999.001.012) �r\ IIII, �• I I( III l(
/1 y IIII < I Ir I I I
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II \ ^ \ \ m1 O®, /% o IIIIIII IIIII III I \ /\1
1 I I I � � ' ` \ ``---�_ - / � _ ,Ill I, I � II 1 I I � � ` ►\
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coGJ1 (IIIIIII I IIIII IIII I \ \__� \\\
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� 11 'Il --\ \ � \ \ / IjV ^ � II I IIIIIIIII I IIII IIII II II
\`\l I III IIIIII IIII III II I I
2400 I,iII I IIi' 8i�
/ / / /, / / !' � � \ �\\y 6 B -- � .�• `.`� I I III I III UI 1 B
V \ `� ,IIIIIII I III I I1 III 041
-17_1-��IIIIII,I I �I I // I
o1Q\` _\ \ \ 625 _---- \\ \ �\ IIIIII" I I 11I /�\moo
le
i ' 041 �_-- ''
' --� `,. \ 1 1 I 1 I 1 I\/�.[ .'
60
��_ �\ �' -fir � \\ \ ` \ ` \ \ / `\ �i-' ,' \._ , / ✓' / \ I /
INCHES 1 2 3 TENTHS 10 20 30 4 5 1
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
LL
LIMITS OF EXISTING RAB LANDFILL LINER
APPROXIMATE ASH BASIN WASTE BOUNDARY
LIMITS OF WATER
100—YR
100 YR FLOOD LINE
SITING CRITERIA BUFFER LIMIT
—
PROPOSED DRAINAGE FLOW PATH
HATCH LEGEND
FUTURE STORMWATER MANAGEMENT AREA
0 300 600 900
GRAPHIC SCALE (IN FEET)
NOT FOR CONSTRUCTION
TITLE
ON -SITE LANDFILL SCHEMATIC PLAN
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 ``\\\\\\Ittrll,///�/ SCALE: AS SHOWN DES: ANR
�¢-�� CA�p�'%�� DUKE DWG TYPE:.DWG DFTR: AMC
o -- 0--sil3•. i�• f JOB NO: 60603204 CHKD: JDM
'' SEAL �: y - �, ENERGY®
r-; = [DATE. 01 -27-20 ENGR: JDM
c- :a 043997
FILENAME: ALN C999.001.040-042 ON -SITE LANDFILL SCHEMATIC.DWG APPD: JDM
� '•., GINS,.•' � —
��i K, �`� DWG SIZE DRAWING NO. REVISION
ANSI ALN C999.001.040 A
9 10
1 1

ALN C999.001 .041
Fm►. A
INCHES
820
810
800
790
780
770
760
750
740
730
720
710
700
690
680
670
660
650
640
630
620
610
600
590
820
810
800
790
780
770
760
750
740
730
720
710
700
690
680
670
660
650
640
630
620
610
600
590
580 580
0+00 1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00 12+000ECT0 14+w -/ 5+00 16+00 17+00 18+00 19+00 20+00 21+00 22+00 23+00 24+00 25+00 26+00 27+00ll
780
770
760
750
740
730
720
710
700
690
680
670
660
650
640
630
620
610
600
590
580
570
560
APPROXIMATE
ASH
BASIN
ASTE BOtJNDARY
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 AAB LANDFILL FOOTPRINT/GRADING
(SEE NOTE 1.2 IN GENERAL NOTES,
ALN_C999.001.012)
DRAWING NO.
PRE -DECANTING GROUNDWATER LEVEL
(SEE REFERENCE 4)
PRE -DECANTING GROUNDWATER MODIFIED
IN AUTOCAD CROSS SECTION TO ACCOUNT
FOR ARTIFACTS CAUSED BY LIMITED
RESOLUTION OF GRID SIZE/SPACING
IN MODFLOW 3D
00,
FREE
WATER
PRIOR
TO DECANTING
EXISTING
GRADE
SOUTHPOINT RD APPROX. ELEV. 672' (NOT
SHOWN - APPROX. 1,770 FT WEST OF STA 0+00)
EXISTING DIKE
\
-
- - -
- HISTORIC
GRADE
/
LAKE WYLIE/
CATAWBA
RIVER
- `
-
/
\
-
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 1 +00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11 +00 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
SECTION B-B'
810
800
790
780
770
760
750
740
730
720
710
700
690
680
670
660
650
640
630
620
610
600
590
580
56P,
-000
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.
PRE -DECANTING GROUNDWATER LEVEL
(SEE REFERENCE 4)
PRE -DECANTING GROUNDWATER MODIFIED
IN AUTOCAD CROSS SECTION TO ACCOUNT
FOR ARTIFACTS CAUSED BY LIMITED
RESOLUTION OF GRID SIZE/SPACING
IN MODFLOW 3D
CONCEPTUAL AAB LANDFILL FOOTPRINT/GRADING
(SEE NOTE 1.2 IN GENERAL NOTES, DRAWING NO.
ALN_C999.001.012)
OOF
FREE WATER PRIOR TO DECANTING
EXISTING DIKE
SOUTHPOINT RD APPROX.
SHOWN - APPROX. 1,500 FT
ELEV. 675' (NOT
WEST OF STA 0+00)
EXISTING
GRADE
HISTORIC GRADE
/
LAKE WYLIE/
-
_
CATAWBA
RIVER
r
\
r
A nnor%\/IR AA rC AQLJ on C1I AI 1A/A QrC r!)l11 IA1r%A MW
810
800
790
780
770
760
750
740
730
720
710
700
690
680
670
660
650
640
630
620
610
600
590
580
56�
0+00 1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00 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
SECTION C-C'
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 AAB LANDFILL FOOTPRINT/GRADING
(SEE NOTE 1.2 IN GENERAL NOTES, DRAWING NO.
ALN_C999.001.012)
000-
EXISTING
GRADE
1A482 (100kV) TRANSMISSION
LINE MAX. SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET
PRE -DECANTING GROUNDWATER MODIFIED
IN AUTOCAD CROSS SECTION TO ACCOUNT
FOR ARTIFACTS CAUSED BY LIMITED
RESOLUTION OF GRID SIZE/SPACING
IN MODFLOW 3D
RETIRED ASH
BASIN
PRE -DECANTING
(SEE REFERENCE
GROUNDWATER LEVEL
4)
EXISTING
DIKE
FREE
WATER PRIOR
TO DECANTING
HISTORIC GRADE
TENTHS i0
0
LEGEND
EXISTING GRADES
- - - - - - - - - - - - - HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
PROPOSED SOIL FILL
PROPOSED ASH FILL
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.
230 KV
24.5 FT.
500 KV
30.5 FT.
0 37.5 75 112.5
VERTICAL SCALE (IN FEET)
0 150 300 450
HORIZONTAL SCALE (IN FEET) NOT FOR CONSTRUCTION
TITLE
ON -SITE LANDFILL SCHEMATIC PLAN
- AAB LF CROSS SECTIONS
"=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 ``0XIItttrr>>��
CA�p�'
DUKE
SCALE: AS SHOWN
DES:
ANR
,��¢-��
DWG TYPE:.DWG
DFTR:
AMC
p ••'o�tissi01
JOB NO: 60603204
CHKD:
JDM
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'�
�,
ENERGY®
DATE: 01-27-20
ENGR:
JDM
c_ : 043997
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FILENAME:
ALN C999.001.040-042 ON -SITE LANDFILL SCHEMATIC.DWG
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APPD:
JDM
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DWG SIZE
DRAWING NO.
REVISION
p Kp
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22.0"x34.0"
ALN C999.001.041
A
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ALN C999.001.042
ay. A
750
740
730
720
710
700
690
680
670 SOUTHPOINT RD APPROX. ELEV. 670' (NOT
SHOWN - APPROX. 400 FT WEST OF STA 0+00)
660
650
640 PRE -DECANTING GROUNDWATER LEVEL
(SEE REFERENCE 4)
630
620
0+00 1 +00 2+00 3+00 4+00
730
720
710
700
690
680
670
660
650
640
630
620
610
0+00
INCHES
2A10 (230kV) TRANSMISSION LINE SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET)
5N5 (500kV) TRANSMISSION LINE SAG ELEVATIONS
(SEE REFERENCE 5, THIS SHEET) -
ld NOTE: FINAL HEIGHT OF PROPOSED
66�LANDFILL HAS NOT BEEN OPTIMIZED.
__ DUKE AND AECOM ARE EVALUATING
METHODS TO REDUCE THE OVERALL
HEIGHT OF THE PROPOSED LANDFILL.
CONCEPTUAL INITIAL LANDFILL FOOTPRINT/GRADING
(SEE NOTE 1.2 IN GENERAL NOTES, DRAWING NO.
ALN_C999.001.012)
5+00 6+00 7+00 8+00 9+00 10+00
SECTION D-D'
11 +00 12+00 13+00 14+00
1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00 12+00 13+00 14+00
SECTION E-El
------------------------------
TENTHS 110 1
EXISTING
GRADE
HISTORIC GRADE
750
740
730
720
710
700
690
680
670
660
650
640
630
620
15+ 00 16+ 00 17+ 00 18+ 03+ 31
730
720
L. 710
700
690
680
670
660
650
640
630
620
610
15+0015+50
LEGEND
EXISTING GRADES
HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
PROPOSED FINAL GRADES
PROPOSED SOIL FILL
PROPOSED ASH FILL
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.
230 KV
24.5 FT.
500 KV
30.5 FT.
0 25 50 75
VERTICAL SCALE (IN FEET)
0 100 200 300
HORIZONTAL SCALE (IN FEET) F NOT FOR CONSTRUCTION
TITLE
ON -SITE LANDFILL SCHEMATIC PLAN
- INITIAL LF CROSS SECTIONS
"=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
CA�0�`�'%
DUKE
DWG TYPE:.DWG
DFTR:
AMC
p ss/o %f
JOB N0: 60603204
CHKD:
JDM
Q SEAL p = Y
ENERGY®
DATE: 01 -27-20
ENGR:
JDM
c_ :a 043997
ti -`
FILENAME: ALN C999.001.040-042 ON -SITE LANDFILL SCHEMATIC.DWG
APPD:
JDM
•. INE,.., p .�
.1 40 Al �`�
DWG SIZE
DRAWING NO.
REVISION
`���
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�
W
ANSID
22.0"x34.0"
ALN C999.001.042
A
910
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CD
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