Mayo CBE - Closure Plan - Appendix D_20200107

APPENDIX D
CLOSURE PLAN DRAWINGS

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MAY_C999.003.001
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DUKE ENERGY
MAYO STEAM ELECTRIC PLANT
COAL COMBUSTION RESIDUALS SURFACE IMPOUNDMENT CLOSURE PLAN DRAWINGS
SITE LOCATION MAP
0 2000 4000 6000
GRAPHIC SCALE (IN FEET)
Kid
)000
T (NC)
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY, NORTH CAROLINA
ASH BASIN DAM STATE ID: PERSO-035, NPDES PERMIT #: NCO038377
DECEMBER 12, 2019
DWG NO.
MAY_C999.003.001
MAY C999.003.002
MAY_C999.003.003
MAY C999.003.004
MAY_C999.003.005
MAY_C999.003.006
MAY_C999.003.007
MAY_C999.003.008
MAY_C999.003.008A
MAY_C999.003.009
MAY_C999.003.010
MAY_C999.003.011
MAY C999.003.012
MAY_C999.003.013
MAY C999.003.014
DRAWING DESCRIPTION
COVER SHEET
GENERAL NOTES
EXISTING CONDITIONS PLAN WITH AERIAL
EXISTING CONDITIONS PLAN WITH TOPOGRAPHIC
MAP
SUBSURFACE EXPLORATION LOCATION PLAN
ESTIMATED BOTTOM OF CCR CONTOUR MAP
DEMOLITION PLAN
FINAL CLOSURE GRADING PLAN I
FINAL CLOSURE GRADING PLAN II
FINAL SURFACE WATER MANAGEMENT PLAN
FINAL CLOSURE GRADING CROSS SECTIONS I
FINAL CLOSURE GRADING CROSS SECTIONS II
FINAL CLOSURE GRADING DETAILS
ONSITE LANDFILL SCHEMATIC PLAN
ONSITE LANDFILL SCHEMATIC PLAN - PROFILES
AND CROSS SECTIONS
SITE VICINITY MAP LONG: 78153'29"W
0 2000 4000 6000
GRAPHIC SCALE (IN FEET)
REV DATE JOB NO. PROJECT TYPE DES DFTR CHKD ENG APPD DESCRIPTION
A 12/5/19 60603277 CLOSURE DMS DMS KK DWC DWC ISSUED FOR APPROVAL
TITLE
A_GOM
PREPARED FOR:
DUKE ENERGY PROGRESS, LLC
410 SOUTH WILMINGTON ST
RALEIGH, NC 27601
PREPARED BY:
AECOM
DOUGLAS W. CARR P.E.
1600 PERIMETER PARKWAY
STE.400
MORRISVILLE, NC 27560
PHONE: [phone]
NOT FOR CONSTRUCTION
COVER SHEET
MAYO STEAM ELECTRIC PLANT
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY. NORTH CAROLINA
IF-0342 N.C. ENGINEERING LICENSE NO. I FOR ISSUED FOR APPROVAL
SEAL
oe�N CARp��y
= Q�pF ESS/pi' .9
SEAL
026889
�O F*GINE�-�
AS W• �P
DUKE SCALE: N.T.S
Ct� DWG TYPE :.DWG
JOB 77
ENERGY® DATE: 62 12 2019
12/2019 FILENAME: 001-COVER SHEET.DWG
DWG SIZE DRAWING NO.
ANSI D
22.0"x34.0"
MAY_C999.003.001
DES: DMS
DFTR : DMS
CHKD: KK
ENGR : DMS
APPD: DWC
REVISION
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MAY_C999.003.002
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GENERAL NOTES
1.0 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 INFORMATION 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.
2.0 PRELIMINARY CONSTRUCTION SEQUENCE:
2.1 REMOVE FREE WATER AND ROUTE TO TEMPORARY WASTEWATER TREATMENT SYSTEM
INSTALLED TO MEET NPDES PERMIT REQUIREMENTS FOR FREE WATER REMOVAL (I.E.
DECANTING). PROCESS WATER FLOWS INTO THE ASH BASIN WERE STOPPED BY
DIVERTING TO THE NEW LINED RETENTION BASIN AND FGD SETTLING BASIN. ADDITIONAL
STORMWATER THAT CONTACTS ASH WILL NEED TO BE PUMPED AND TREATED FROM
THE FREE WATER POOL.
2.2 INSTALL AN INTERSTITIAL WATER REMOVAL/DEWATERING SYSTEM TO SUPPORT
EXCAVATION AND CONSTRUCTION ACCESS.
2.3 UPGRADE THE WATER TREATMENT SYSTEM TO HANDLE INTERSTITIAL WATER
TREATMENT (I.E. DEWATERING) REQUIREMENTS OF THE NPDES PERMIT IN PREPARATION
FOR ASH EXCAVATION AND ASSOCIATED INTERSTITIAL WATER REMOVAL TO SUPPORT
CONSTRUCTION EQUIPMENT ACCESS AND EXCAVATION STABILITY.
2.4 CONSTRUCT STORMWATER DIVERSION AREAS AND PROPOSED LANDFILL CELL(S) THAT
ARE OUTSIDE THE APPROXIMATE ASH BASIN WASTE BOUNDARY.
2.5 INSTALL EROSION AND SEDIMENT CONTROL (E&SC) MEASURES UPON OBTAINING E&SC
PERMIT.
2.6 START ASH EXCAVATION FROM THE PROPOSED CLOSURE BY EXCAVATION AREAS
WHERE A FUTURE LANDFILL IS PROPOSED. 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 DETAIL PLANS AND SPECIFICATIONS TO BE
DEVELOPED PRIOR TO CONSTRUCTION. PLACE THE EXCAVATED AND DEWATERED ASH
IN THE BUILT LANDFILL CELLS.
2.7 PROCEED WITH LANDFILL CELL CONSTRUCTION (PERMIT PACKAGE TO BE SUBMITTED
UNDER SEPARATE COVER UPON APPROVAL OF THIS CLOSURE PLAN) WITHIN THE
EXCAVATED PORTIONS OF THE ASH BASIN AND SEQUENCE ASH EXCAVATION TO PLACE
THE EXCAVATED ASH INTO THE LANDFILL. DEWATERING OF THE ASH WILL BE NEEDED
TO MEET THE COMPACTION REQUIREMENTS FOR LANDFILL PLACEMENT. COMPLETE ASH
EXCAVATION AS VISUALLY VERIFIED.
2.8 SEQUENCE THE CONSTRUCTION OF STORMWATER DETENTION BASINS WITH THE
BREACHING OF THE DAM. SEQUENCE THE DAM BREACHING WITH LANDFILL CAPPING
AND STORMWATER MANAGEMENT.
2.9 START REMOVAL OF ASH BASIN DAM. USE APPROVED PORTIONS OF THE DAM SOIL FOR
FINAL COVER OF THE LANDFILL AND STORMWATER BASIN BERMS, AND THE REMAINDER
AS PART OF THE GRADING FILL WITHIN THE EXCAVATED ASH BASIN. SEQUENCE DAM
BREACHING WITH CONSTRUCTION OF PROPOSED STORMWATER DETENTION 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.
2.10 COMPLETE DAM BREACH. COMPLETE CLOSURE BY EXCAVATION VERIFICATION.
COMPLETE CONSTRUCTION OF PROPOSED SURFACE WATER DETENTION BASINS.
COMPLETE LANDFILL CLOSURE.
3.0 DATUM
3.1 ALL ELEVATIONS SHOWN ON THIS DRAWING ARE REFERENCED TO NORTH AMERICAN
VERTICAL DATUM, 1988 (NAVD88). ELEVATIONS ARE IN FEET.
3.2 HORIZONTAL DATUM (SHOWN IN FEET): NORTH AMERICAN DATUM 1983 (NAD83).
DETAIL IDENTIFYING
NUMBER
SHEET NO. WHERE
DETAIL IS SHOWN
DETAIL REFERENCE
ON SHEET WHERE DETAIL IS CALLED OUT
SECTION IDENTIFYING
LETTER
SHEET NO. WHERE DETAIL
OR SECTION IS CALL OUT
SECTION REFERENCE
ON SHEET WHERE SECTION IS CALLED OUT
DETAIL OR SECTION
TITLE
DETAIL IDENTIFYING NUMBER OR
SECTION IDENTIFYING LETTER
2 TITLE
2 SCALE
SHEET NO. WHERE DETAIL
OR SECTION IS CALL OUT
DETAIL OR SECTION, NUMBER OR LETTER & TITLE
ON SHEET WHERE DETAIL OR SECTION IS SHOWN
SURVEY LEGEND
EC CONCRETE SLAB - PAD
DROP INLET DRAIN
-XXXXXXXXXX_ FENCE LINE - CHAIN LINK
------------ FENCE LINE - OTHER
OHE
GRAVEL / DIRT PATH
LIGHT POLE
OVERHEAD UTILITIES
PATH - TRAIL
PAVED SURFACE
POST
DUKE ENERGY PROPERTY BOUNDARY
RCP REINFORCED CONCRETE PIPE
SIGN
STORM DRAIN
nTANK
TREE / BRUSH LINE
�{ X UNIDENTIFIED UTILITIES / STRUCTURES / OBJECTS
�) � UTILITY POLE / TRANSMISSION POLE / TRANS. TOWER
® VAULT
WATER VALVE
- - - - - - - - - EXISTING MINOR CONTOURS (5 FT)
EXISTING MAJOR CONTOURS (25 FT)
L=com
N.C. ENGINEERING LICENSE NO.
F-0342
SEAL
ss/oti9 'yy
SEAL
026889
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TITLE
NOT FOR CONSTRUCTION
GENERAL NOTES
MAYO STEAM ELECTRIC PLANT
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY, NORTH CAROLINA
FOR
ISSUED FOR APPROVAL
SCALE: N.T.S.
DUKE
DWG TYPE :.DWG
JOB
77
ENFM%*2Y® DATE: 62 12 2019
(Z12011 FILENAME: 002-GENERAL NOTES.DWG
DWG SIZE DRAWING NO.
ANSI D
22.0"x34.0"
MAY_C999.003.002
DES: DMS
DFTR : DMS
CHKD: KK
ENGR : DC
APPD: DWC
REVISION
0 1 2 3 ? TENTHS 10 20 30
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ASH BASIN � +`
(NORMAL WSEL PRIOR TO -' �', # F STREAM, TYP. *.
WETLANDS, TYP. DECANTING= 479 FT t- 11 ',
# �;�+ WETLANDS, TYP. L
:r: EQUALIZATION PIPES = k
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1 `! EXISTING NPDES OUTFACE 002
J r�{'++�`r 3 �, , 4 / ' / i / FGD FORWARD FLUSH POND
'IS �.aY -� -'S., _{ k._, J.;'I r-.'., '�•' 1 - Lo (DAM ID: PERSO-037) , -
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n `���-■.��`*� - , I 1 f•h r It ' NORMAL WSEL = 436 FVA
Id
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FLL
LINED RETENTIONir
BASIN ` }}�i.
I _ ' I I ' •I Y,
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�`•� .1, , % AREA
F ` _•* \ /j ` r _ r F ,. � _'�. 7 �!, it
ri �' ♦ STORMWATER REDIRECT
BASIN s r%�`Iti� •ti* r I 5 - •` ji -�' r;, f �.. ` K. IV
*`�',•�' MAYO STEAM ELECTRIC PLANT
• L', t / r r•'R - •' ` 11 • } ■ } '�� * f'.'-��1 }r ` '®%' ° " '' - ' - �1 1 �� 4 ti . � _ ,' � 'F � *'
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_
MAY_C999.003.003
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LEGEND
APPROXIMATE ASH BASIN WASTE BOUNDARY
DUKE ENERGY PROPERTY BOUNDARY
ADJACENT PROPERTY BOUNDARY
RIGHT OF WAY
NPDES OUTFALL LOCATION
WSEL WATER SURFACE ELEVATION
;:;I EXISTING WETLANDS (SEE NOTE 4)
— — — — — EXISTING STREAM
REFERENCE
1. AERIAL PHOTOGRAPH WAS OBTAINED FROM BING MAPS DATED
2018.
2. ASH BASIN WSEL PRESENTED IN THIS DRAWING ARE TAKEN
FROM "AERIAL TOPOGRAPHIC SURVEY - MAYO PLANT" DATED
OCTOBER 31, 2015 PREPARED BY WSP FOR DUKE ENERGY.
3. APPROXIMATE ASH BASIN WASTE BOUNDARY PRESENTED IN
THIS DRAWING WAS PREPARED BY SYNTERRA FOR DUKE
ENERGY. UPDATED SEPTEMBER 2018.
4. THE WATERS OF THE US HAVE NOT BEEN APPROVED BY THE US
ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP
CREATION. THIS MAP IS A PRELIMINARY JURISDICTIONAL
DETERMINATION ONLY. THE PRELIMINARY WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM AMEC FOSTER
WHEELER ENVIRONMENTAL & INFRASTRUCTURE, INC. NATURAL
RESOURCE TECHNICAL REPORT FOR MAYO STEAM ELECTRIC
PLANT DATED JANUARY 20, 2014.
0 400 800 1200
GRAPHIC SCALE (IN FEET)
NOT FOR CONSTRUCTION
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— — — — APPROXIMATE ASH BASIN WASTE BOUNDARY
DUKE ENERGY PROPERTY BOUNDARY
ADJACENT PROPERTY BOUNDARY
— — RIGHT OF WAY
— — — — — EXISTING MINOR CONTOURS (5 FT)
— - EXISTING MAJOR CONTOURS (25 FT)
® GROUNDWATER MONITORING WELL
IK SEEPS (APPROX. LOCATION SEE REF. 6)
EXISTING PIEZOMETER
+ + + + + + + + + EXISTING WETLANDS
- EXISTING STREAM
TITLE
F AREAS UNDER WATER DURING BATHYMETRY
NO BATHYMETRY AVAILABLE
COMPLIANCE MONITORING WELL
IS ABMW 2BR
WELL IN COMPETENT BEDROCK
ABMW 2
WELL IN ASH PORE WATER
s MW-16D
WELL IN TRANSITION ZONE
e MW 16S
WELL IN ALLUVIUM MATERIAL
c Mw-8S
WELL IN SAPROLITE MATERIAL
REFERENCE
1. TOPOGRAPHIC DATA PRESENTED IN THIS DRAWING IS TAKEN
FROM "AERIAL TOPOGRAPHIC SURVEY - MAYO PLANT" DATED
OCTOBER 31, 2015 PREPARED BY WSP FOR DUKE ENERGY.
2. APPROXIMATE ASH BASIN WASTE BOUNDARY PRESENTED IN THIS
DRAWING IS PREPARED BY SYNTERRA FOR DUKE ENERGY.
UPDATED SEPTEMBER 2018
3. BATHYMETRIC SURVEYS CONDUCTED BY WSP IN AUGUST 2014 &
FEBRUARY 2015. ISOLATED PONDS AROUND THE ASH BASIN ARE
INACCESSIBLE FOR SURVEY.
4. NO UNDERGROUND UTILITIES HAVE BEEN LOCATED OR MAPPED
FOR THIS PROJECT. THE LOCATION OF ANY AND ALL UTILITIES
SHOWN HEREON WHETHER PUBLIC/PRIVATE, ARE BASED ON
PHOTOGRAMMATIC MAPPING AND ARE APPROXIMATE ONLY.
5. BASIS OF BEARINGS: NC GRID NAD83/2011,ELEVATIONS ARE
BASED ON NAVD88.
6. SEEP LOCATIONS DEPICTED ARE APPROXIMATE AND BASED ON
"COMPREHENSIVE SITE ASSESSMENT REPORT - MAYO STEAM
ELECTRIC PLANT " PREPARED BY SYNTERRA FOR DUKE ENERGY
AND SUBMITTED TO NCDEQ (NPDES PERMIT NO. NCO038377) ON
SEPTEMBER 2, 2015.
7. THE WATERS OF THE US HAVE NOT BEEN APPROVED BY THE US
ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP
CREATION. THIS MAP IS A PRELIMINARY JURISDICTIONAL
DETERMINATION ONLY. THE PRELIMINARY WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM AMEC FOSTER
WHEELER ENVIRONMENTAL & INFRASTRUCTURE, INC. NATURAL
RESOURCE TECHNICAL REPORT FOR MAYO STEAM ELECTRIC
PLANT DATED JANUARY 20, 2014.
NOT FOR CONSTRUCTION
EXISTING CONDITIONS PLAN WITH
TOPOGRAPHIC MAP
MAYO STEAM ELECTRIC PLANT
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY, NORTH CAROLINA
FOR ISSUED FOR APPROVAL
D��E
ENE RGYC
SCALE: 1" = 300'
DES: DMS
DWG TYPE :.DWG
DFTR : DMS
2019
DATE: 12/12
ENGR : DMS
FILENAME: 004-EXISTING CONDITION.DWG
APPD: DWC
DWG SIZE
DRAWING NO.
REVISION
ANSI D
22.0"x34.0" MAY_C999.003.004 A
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LEGEND
APPROX. ASH BASIN WASTE BOUNDARY
DUKE ENERGY PROPERTY BOUNDARY
ADJACENT PROPERTY BOUNDARY
— RIGHT OF WAY
- - - - EXISTING MINOR CONTOURS (5 FT)
— - EXISTING MAJOR CONTOURS (25 FT)
N
SEEPS (APPROX. LOCATION SEE REF. 6)
EXISTING PIEZOMETER
AECOM/URS BORING (2014)
IAECOM
BORING (2015)
®
AECOM BORING (2016)
O
AECOM BORING (2018)
O
AECOM/URS CPT SOUNDING (2014)
0
AECOM CPT SOUNDING (2015)
0
AECOM CPT SOUNDING (2016)
0
S&ME MONITORING WELL (2010)
—� MACTEC PIEZOMETER
EXISTING WETLANDS
EXISTING STREAM
AREAS UNDER WATER DURING BATHYMETRY
NO BATHYMETRY AVAILABLE
COMPLIANCE MONITORING WELL
ABMW-2BR WELL IN COMPETENT BEDROCK
s ABMW 2 WELL IN ASH PORE WATER
MW 16D WELL IN TRANSITION ZONE
� Mw 16s WELL IN ALLUVIUM MATERIAL
c MW 8S WELL IN SAPROLITE MATERIAL
REFERENCE
1. TOPOGRAPHIC DATA PRESENTED IN THIS DRAWING IS TAKEN FROM
"AERIAL TOPOGRAPHIC SURVEY - MAYO PLANT" DATED OCTOBER 31,
2015 PREPARED BY WSP FOR DUKE ENERGY.
2. APPROXIMATE ASH BASIN WASTE BOUNDARY PRESENTED IN THIS
DRAWING WAS PREPARED BY SYNTERRA FOR DUKE ENERGY.
UPDATED SEPTEMBER 2018.
3. BATHYMETRIC SURVEYS CONDUCTED BY WSP IN AUGUST 2014 &
FEBRUARY 2015. ISOLATED PONDS AROUND THE ASH BASIN ARE
INACCESSIBLE FOR SURVEY.
4. NO UNDERGROUND UTILITIES HAVE BEEN LOCATED OR MAPPED
FOR THIS PROJECT. THE LOCATION OF ANY AND ALL UTILITIES
SHOWN HEREON WHETHER PUBLIC/PRIVATE, ARE BASED ON
PHOTOGRAMMATIC MAPPING AND ARE APPROXIMATE ONLY.
5. BASIS OF BEARINGS: NC GRID NAD83/2011 ,ELEVATIONS ARE BASED
ON NAVD88.
6. SEEP LOCATIONS DEPICTED ARE APPROXIMATE AND BASED ON
"COMPREHENSIVE SITE ASSESSMENT REPORT - MAYO STEAM
ELECTRIC PLANT " PREPARED BY SYNTERRA FOR DUKE ENERGY
AND SUBMITTED TO NCDEQ (NPDES PERMIT NO. NC0038377) ON
SEPTEMBER 2, 2015.
7. THE WATERS OF THE US HAVE NOT BEEN APPROVED BY THE US
ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP CREATION.
THIS MAP IS A PRELIMINARY JURISDICTIONAL DETERMINATION
ONLY. THE PRELIMINARY WETLANDS AND STREAMS BOUNDARIES
WERE OBTAINED FROM AMEC FOSTER WHEELER ENVIRONMENTAL
& INFRASTRUCTURE, INC. NATURAL RESOURCE TECHNICAL REPORT
FOR MAYO STEAM ELECTRIC PLANT DATED JANUARY 20, 2014.
KinTC
1. GROUNDWATER MONITORING WELL LOCATIONS SHOWN FOR
REFERENCE, ACTUAL LOCATIONS AND WELL DETAILS ARE
PROVIDED IN THE CAP.
NOT FOR CONSTRUCTION
TITLE
SUBSURFACE EXPLORATION
LOCATION PLAN
MAYO STEAM ELECTRIC PLANT
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY, NORTH CAROLINA
FOR ISSUED FOR APPROVAL
r.
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EN�RGYC
SCALE: 1" = 300'
DES:
DMS
DWG TYPE :.DWG
DFTR :
DMS
6�602 2019
DATENO:
ENGR:
DMS
FILENAME:
005-SUBSURFACE EXP LOCATION PLAN.DWG
APPD:
DWC
DWG SIZE
DRAWING NO.
REVISION
ANSI D
22.0"x34.0"
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s MAY_C999.003.007 REV. A
LEGEND
APPROXIMATE ASH BASIN WASTE BOUNDARY
m
,,
.........
. . . . . . . . .
DUKE ENERGY PROPERTY BOUNDARY
ADJACENT PROPERTY
RIGHT OF WAY
EXISTING MINOR CONTOURS (5 FT)
EXISTING MAJOR CONTOURS (25 FT)
DEMOLITION AREA
EXISTING WETLANDS
EXISTING STREAM
EXISTING PIEZOMETERS
EXISTING ENGINEERED SEEPS
REFERENCE
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE
BASED ON NAVD88.
2. THE WATERS OF THE US HAVE NOT BEEN APPROVED BY THE US
ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP
CREATION. THIS MAP IS A PRELIMINARY JURISDICTIONAL
DETERMINATION ONLY. THE PRELIMINARY WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM AMEC FOSTER
WHEELER ENVIRONMENTAL & INFRASTRUCTURE, INC. NATURAL
RESOURCE TECHNICAL REPORT FOR MAYO STEAM ELECTRIC
PLANT DATED JANUARY 20, 2014.
NOTES:
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 BASED ON ADDITIONAL
SITE AND SURVEY INFORMATION OBTAINED. DIFFERENT
STRUCTURES NEED TO BE DEMOLISHED AT DIFFERENT STAGES
OF THE CLOSURE PROJECT BASED ON CONSTRUCTION
SEQUENCE. DETAILED SEQUENCING WILL BE DEVELOPED PRIOR
TO CONSTRUCTION.
2. THE FGD SETTLING AND FORWARD FLUSH PONDS ARE
CONSTRUCTED OVER THE ASH BASIN AND WILL BE CLOSED AS A
SINGLE UNIT. FGD SETTLING POND DAM DISCHARGE
STRUCTURE WILL BE REMOVED.
3. THE FGD SETTLING AND FORWARD FLUSH POND WILL BE
DECOMMISSIONED AND REMOVED.
4. THE EQUALIZER OUTLET PIPES TO FOREBAY AND ANY
INCIDENTAL EQUIPMENT WILL BE DEMOLISHED AND REMOVED.
5. EXISTING SLUICE LINES TO BE REMOVED AS PART OF CLOSURE.
ANY INTERNAL INFLOW PIPES INTO THE ASH BASIN THAT REMAIN
AT THE TIME OF CONSTRUCTION WILL BE REMOVED.
6. SEEPAGE COLLECTION SYSTEM FOR THE ASH BASIN WILL BE
REMOVED AS PART OF CLOSURE.
TITLE
FOR
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GRAPHIC SCALE (IN FEET)
NOT FOR CONSTRUCTION
DEMOLITION PLAN
MAYO STEAM ELECTRIC PLANT
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY, NORTH CAROLINA
ISSUED FOR APPROVAL
D���
ENERGYC
SCALE: 1" = 300'
DES: DMS
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J ` \ N.C. ENGINEERING LICENSE NO.
J ) i / I ,ill / I /♦ \\ \ / _ \\ \
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— — — APPROXIMATE ASH BASIN WASTE BOUNDARY
DUKE ENERGY PROPERTY BOUNDARY
RIGHT OF WAY
EXISTING MINOR CONTOURS (5 FT)
EXISTING MAJOR CONTOURS (25 FT)
+ + + ' ` ' ` ' EXISTING WETLANDS
+ + + + + ++ ++
EXISTING STREAM
- BOTTOM OF ASH MINOR CONTOUR (5 FT)
- - - - - - - - BOTTOM OF ASH MAJOR CONTOUR (25 FT) A
- - - - - PROPOSED MINOR CONTOURS (5 FT)
- - - - - - - - PROPOSED MAJOR CONTOURS (25 FT)
no= 100-YR 24-HR MAXIMUM WATER SURFACE
ELEVATION
Em- CONCEPTUAL CCR LANDFILL
REFERENCE
1. TOPOGRAPHIC DATA PRESENTED IN THIS DRAWING IS TAKEN
FROM "AERIAL TOPOGRAPHIC SURVEY - MAYO PLANT" DATED
OCTOBER 31, 2015 PREPARED BY WSP FOR DUKE ENERGY.
2. APPROXIMATE ASH BASIN WASTE BOUNDARY PRESENTED IN THIS
DRAWING IS PREPARED BY SYNTERRA FOR DUKE ENERGY,
UPDATED SEPTEMBER 2018.
3. NO UNDERGROUND UTILITIES HAVE BEEN LOCATED OR MAPPED
FOR THIS PROJECT. THE LOCATION OF ANY AND ALL UTILITIES
SHOWN HEREON WHETHER PUBLIC/PRIVATE, ARE BASED ON
PHOTOGRAMMATIC MAPPING AND ARE APPROXIMATE ONLY.
4. BASIS OF BEARINGS: NC GRID NAD83/201 1, ELEVATIONS ARE
BASED ON NAVD88.
5. THE WATERS OF THE US HAVE NOT BEEN APPROVED BY THE US
ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP
CREATION. THIS MAP IS A PRELIMINARY JURISDICTIONAL
DETERMINATION ONLY. THE PRELIMINARY WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM AMEC FOSTER
WHEELER ENVIRONMENTAL & INFRASTRUCTURE, INC. NATURAL
RESOURCE TECHNICAL REPORT FOR MAYO STEAM ELECTRIC
PLANT DATED JANUARY 20, 2014.
TITLE
NOTES [—C
E
1. GRADES SHOWN INDICATE APPROXIMATE FINAL CLOSURE
D
GRADES.
I_<
2. FINISHED GRADES REFLECT HISTORICAL PREDEVELOPMENT
tip
GRADES WITHIN ASH BASIN.
to
3. DETENTION BASIN EMBANKMENTS SHALL BE CONSTRUCTED IN
ACCORDANCE WITH THE PROJECT SPECIFIC SPECIFICATIONS TO
t0
BE DEVELOPED PRIOR TO CONSTRUCTION.
o
0
00
0 300 600 900
GRAPHIC SCALE (IN FEET)
NOT FOR CONSTRUCTION
FINAL CLOSURE GRADING PLAN I
MAYO STEAM ELECTRIC PLANT
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY, NORTH CAROLINA
FOR ISSUED FOR APPROVAL
fft DUKE
ENE RGYC
SCALE: 1" = 300'
DES: DMS
DWG TYPE :.DWG
DFTR : DMS
JOB
2019
DATE: 12/12
ENGR : DMS
FILENAME: 008-FINAL GRADING PLAN.DWG
I APPD: DWC
DWG SIZE
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DETENTION BASIN 1:
5.4 ACRES SURFACE AREA < 026889 f IZlZoil
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APPROXIMATE ASH BASIN WASTE BOUNDARY
DUKE ENERGY PROPERTY BOUNDARY
RIGHT OF WAY A
EXISTING MINOR CONTOURS (5 FT)
EXISTING MAJOR CONTOURS (25 FT)
EXISTING WETLANDS
EXISTING STREAM
PROPOSED MINOR CONTOURS (5 FT)
PROPOSED MAJOR CONTOURS (25 FT)
PEAK WATER SURFACE ELEVATION FOR 100-YR
STORM EVENT
REFERENCE
1. TOPOGRAPHIC DATA PRESENTED IN THIS DRAWING IS TAKEN
FROM "AERIAL TOPOGRAPHIC SURVEY - MAYO PLANT' DATED
OCTOBER 31, 2015 PREPARED BY WSP FOR DUKE ENERGY.
2. APPROXIMATE ASH BASIN WASTE BOUNDARY PRESENTED IN THIS
DRAWING IS PREPARED BY SYNTERRA FOR DUKE ENERGY.
UPDATED SEPTEMBER 2018
3. NO UNDERGROUND UTILITIES HAVE BEEN LOCATED OR MAPPED
FOR THIS PROJECT. THE LOCATION OF ANY AND ALL UTILITIES
SHOWN HEREON WHETHER PUBLIC/PRIVATE, ARE BASED ON
PHOTOGRAMMATIC MAPPING AND ARE APPROXIMATE ONLY.
4. BASIS OF BEARINGS: NC GRID NAD83/2011,ELEVATIONS ARE
BASED ON NAVD88.
5. THE WATERS OF THE US HAVE NOT BEEN APPROVED BY THE US
ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP
CREATION. THIS MAP IS A PRELIMINARY JURISDICTIONAL
DETERMINATION ONLY. THE PRELIMINARY WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM AMEC FOSTER
WHEELER ENVIRONMENTAL & INFRASTRUCTURE, INC. NATURAL
RESOURCE TECHNICAL REPORT FOR MAYO STEAM ELECTRIC
PLANT DATED JANUARY 20, 2014.
TITLE
I
0
NOTES
w
to
1. GRADES SHOWN INDICATE FINAL CLOSURE GRADES.
p
2. DIVERSION CHANNELS SHALL BE CONSTRUCTED TO DIVERT
DOWNSTREAM FLOW INTO DETENTION BASIN TO PROVIDE EQUAL
p
TO OR LESS FLOW DOWNSTREAM.
00
D
Zl
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0 60 120 180
GRAPHIC SCALE (IN FEET)
NOT FOR CONSTRUCTION
FINAL CLOSURE GRADING PLAN II
MAYO STEAM ELECTRIC PLANT
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY, NORTH CAROLINA
FOR
ISSUED FOR APPROVAL
fft DUKE
ENE RGYC
SCALE: 1" = 80'
DES:
DMS
DWG TYPE :.DWG
DFTR :
DMS
JOB 6603277
DATE: 12/12 019
ENGR :
DMS
FILENAME:
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APPD:
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DWG SIZE
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REVISION
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/ / / ' I G ( 1I -11 r \` \\ \\
475 I / // / / 1 1 j 1 `\ \ \\ N.C. ENGINEERING LICENSE NO. FOR
\ \
/ / \\ 1 .- /' ^ / / ice/% \ I 1t \\,'
\`\ N\\I F-0342
+++++++++
I.
+ + + + + + + + +
ADJACENT PROPERTY BOUNDARY
EXISTING MINOR CONTOURS (5 FT)
EXISTING MAJOR CONTOURS (25 FT)
EXISTING WETLANDS
EXISTING STREAM
PROPOSED MINOR CONTOURS (5 FT)
PROPOSED MAJOR CONTOURS (25 FT)
DRAINAGE BOUNDARY
FLOW ARROW
PEAK WATER SURFACE ELEVATION FOR 100-YR
24-HR STORM EVENT
REFERENCE
TOPOGRAPHIC DATA PRESENTED IN THIS DRAWING IS TAKEN
FROM "AERIAL TOPOGRAPHIC SURVEY - MAYO PLANT" DATED
OCTOBER 31, 2015 PREPARED BY WSP FOR DUKE ENERGY.
APPROXIMATE ASH BASIN WASTE BOUNDARY PRESENTED IN THIS
DRAWING IS PREPARED BY SYNTERRA FOR DUKE ENERGY.
UPDATED SEPTEMBER 2018
NO UNDERGROUND UTILITIES HAVE BEEN LOCATED OR MAPPED
FOR THIS PROJECT. THE LOCATION OF ANY AND ALL UTILITIES
SHOWN HEREON WHETHER PUBLIC/PRIVATE, ARE BASED ON
PHOTOGRAMMATIC MAPPING AND ARE APPROXIMATE ONLY.
BASIS OF BEARINGS: NC GRID NAD83/2011,ELEVATIONS ARE
BASED ON NAVD88.
THE WATERS OF THE US HAVE NOT BEEN APPROVED BY THE US
ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP
CREATION. THIS MAP IS A PRELIMINARY JURISDICTIONAL
DETERMINATION ONLY. THE PRELIMINARY WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM AMEC FOSTER
WHEELER ENVIRONMENTAL & INFRASTRUCTURE, INC. NATURAL
RESOURCE TECHNICAL REPORT FOR MAYO STEAM ELECTRIC
PLANT DATED JANUARY 20, 2014.
0
NOTES
GRADES SHOWN INDICATE FINAL CLOSURE GRADES.
E
D
FINISHED GRADES REFLECT HISTORICAL PREDEVELOPMENT
GRADES WITHIN ASH BASIN.
I
DETENTION BASIN EMBANKMENTS SHALL BE CONSTRUCTED IN
to
ACCORDANCE WITH THE PROJECT SPECIFIC SPECIFICATIONS TO
p
BE DEVELOPED PRIOR TO CONSTRUCTION.
C
0
w
PROPOSED DETENTION BASIN DESIGNS ARE CONCEPTUAL AND
OC
WILL NEED DETAILED DESIGN AS PART OF DAM MODIFICATION
(D
AND DECOMMISSIONING PLAN APPLICATION.
0 200 400 600
GRAPHIC SCALE (IN FEET)
NOT FOR CONSTRUCTION
FINAL SURFACE WATER MANAGEMENT
PLAN
MAYO STEAM ELECTRIC PLANT
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY, NORTH CAROLINA
ISSUED FOR APPROVAL
.' I I / ,' / / /"' / / -A / \\ f -\. I ` \\\ \ SEAL SCALE: 1" = 200' DES: DMS
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550
550
MAY_C999.003.010 REV. E
500
450
400
A
350
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650
600
550
B
500
450
400
c
350
0+00
550
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450
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MAYO LAKE ROAD Q l
EXISTING ASH BASIN DAM (TO
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m
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PROPOSED DETENTION BASIN WATERSURFACE ELVATION FOR
CREST ELEVATION - 402.00 100-YR 24-HR STORM EVENT
(2) 24" OUTLET CULVERTS Q HEIGHT = 12 FT
FREE WATER BEING PRE -DECANTING GROUNDWATER
LOWERED BY DECANTING (SEE NOTE )
EXISTING GRADE
PROPOSED DETENTION BASIN
CREST ELEVATION = 410.00
HEIGHT = 8 FT
5+00 10+00 15+00 20+00
PRE -DECANTING CONCEPTUAL PLANS OF
GUNDWATER (SEE PROPOSED LANDFILL
NOTE 2)
- -M
DURING CONSTRUCTION, ASH TO BE EXCAVATED AND
SOIL FILL PLACED TO CONSTRUCT LANDFILL
SUBGRADE. DETAILED LANDFILL DESIGN TO BE
DEVELOPED UNDER A SEPARATE DESIGN PACKAGE.
Q
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PROPOSED CONCEPTUAL LANDFILL GRADE
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N
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w
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PROFILE A - A
WATER SURFACE ELVATION FOR
100-YR 24-HR STORM EVENT
HISTORICAL GRADE (BOTTOM OF CCR MATERIAL)
(2) 12" OUTLET
CULVERTS
30+00 35+00 40+00 45+00
FREE WATER BEING
LOWERED BY DECANTING
5+00 10+00 15+00 20+00 25+00 30+00 35+00
CROSS-SECTION B - B
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PRE -DECANTING GROUNDWATER
PROPOSED FINAL GRADE
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LANDFILL DESIGN TO BE DEVELOPED UNDER A
SEPAR TE DESIGN PACKAGE.
HISTORICAL GRADE
I
MATERIAL)
0+00 5+00 10+00 15+00 20+00
CROSS-SECTION C - C
0 1 2 3 2 TENTHS 10 20 30 3
25+00
30+00
35+00
650
550
500
450
400
375
40+ 00
oI SEE NOTE 2
zl
m
Q
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cn l
Q
ml
N
Q
w
�I
500
450
400
350
50+00
54+00 REFERENCE
1. EXISTING GRADE INFORMATION PRESENTED IN THIS DRAWING IS
LEGEND
TAKEN FROM "AERIAL TOPOGRAPHIC SURVEY - MAYO PLANT"
DATED OCTOBER 31, 2015 PREPARED BY WSP FOR DUKE
PROPOSED FINAL GRADE (EXCAVATION GRADE)
ENERGY.
EXISTING GRADE
2. APPROXIMATE ASH BASIN WASTE BOUNDARY PRESENTED IN
THIS DRAWING WAS PREPARED BY SYNTERRA FOR DUKE
PRE -DECANTING GROUNDWATER
ENERGY. UPDATED SEPTEMBER 2018.
LANDFILL GRADES (UNDER SEPARATE DESIGN
3. CONTOURS SHOWN UNDER WATER PER BATHYMETRIC SURVEYS
PACKAGE)
CONDUCTED BY WSP IN AUGUST 2014 & FEBRUARY 2015.
ISOLATED PONDS AROUND THE ASH BASIN ARE INACCESSIBLE
INFERRED EXISTING SURFACE
FOR SURVEY.
4. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE
BASED ON NAVD88
5. HISTORICAL GRADE INFORMATION BASED ON DIGITIZED
F
011
CONTOUR DATA FROM "MAYO E.G.P - ASH POND DAM" DRAWING
010
PREPARED BY CAROLINA POWER & LIGHT COMPANY DATED
FEBRUARY18,1983.
NOTES
`\%�/�i�pii/
1. FIELD VERIFICATION REQUIRED WHERE EXISTING GRADES DO
F
` ,``t !x_R iN/
NOT MATCH HISTORICAL GRADES OUTSIDE THE APPROXIMATE
ASH BASIN WASTE BOUNDARY. CLOSURE BY EXCAVATION SHALL
MATCH GRADES AT THESE LOCATIONS.
.cam iN
010
2. WATER TABLE ELEVATIONS FOR PRE -DECANTING CONDITIONS
J
WERE PROVIDED BY SYNTERRA IN 2019 ALONG WITH THE BASIS
"`��/(
AS FOLLOWS: SIMULATED STEADY-STATE GROUNDWATER
10 w\\ oio
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HYDRAULIC HEADS FROM THE 2018 SYNTERRA GROUNDWATER
flies\
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MODEL. THIS FLOW MODEL WAS CALIBRATED TO
(
TIME -AVERAGED HYDRAULIC HEADS MEASURED IN MONITORING
'G(l�i(!'r'�
WELLS PRIOR TO THE START OF DECANTING. THE SIMULATED
HYDRAULIC HEADS ARE TAKEN FROM THE SAPROLITE OR
E
TRANSITION ZONE MODEL LAYERS, AND ARE APPROXIMATELY
f Oil/ APPROXIMATE
EQUAL TO THE WATER TABLE ELEVATIONS.
0 20 40 60
VERTICAL SCALE (IN FEET)
0 200 400 600
HORIZONTAL SCALE (IN FEET)
NOT FOR CONSTRUCTION
TITLE
FINAL CLOSURE GRADING CROSS
SECTIONS I
P"=com MAYO STEAM ELECTRIC PLANT
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR F-0342 ISSUED FOR APPROVAL
SEAL SCALE: AS NOTED DES: DMS
�N � CAROB DUKE DWG TYPE :.DWG DFTR : DMS
�SS �� JOB NO: 60603277 CHKD: KK
� <�°SEAL L 9 ENEm%JY SFATE: 12/12/2019 ENGR : DMS
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q$ W. GP ANSI D
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2 3 2 TENTHS 10 20 30 3 4
500
450
400
350
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550
500
450
400
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LEGEND
PROPOSED FINAL GRADE (EXCAVATION GRADE)
EXISTING GRADE
PRE -DECANTING GROUNDWATER
LANDFILL GRADES (UNDER SEPARATE DESIGN
PACKAGE)
7
TITLE
P"=com
N.C. ENGINEERING LICENSE NO. I FOR
F-0342
SEAL
o��N CARp�i
�, oF E.SS/o+
Q�29
SEAL
026889 1 1Z1ZO19 FILENAME:
O FNGINEF� �� DWG SIZE
G�� As W. GP ANSI D
22.0"x34.0"
REFERENCE
1. EXISTING GRADE INFORMATION PRESENTED IN THIS DRAWING IS
TAKEN FROM "AERIAL TOPOGRAPHIC SURVEY - MAYO PLANT"
DATED OCTOBER 31, 2015 PREPARED BY WSP FOR DUKE
ENERGY.
2. APPROXIMATE ASH BASIN WASTE BOUNDARY PRESENTED IN
THIS DRAWING WAS PREPARED BY SYNTERRA FOR DUKE
ENERGY. UPDATED SEPTEMBER 2018.
3. CONTOURS SHOWN UNDER WATER PER BATHYMETRIC SURVEYS
CONDUCTED BY WSP IN AUGUST 2014 & FEBRUARY 2015.
ISOLATED PONDS AROUND THE ASH BASIN ARE INACCESSIBLE
FOR SURVEY.
4. BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE
BASED ON NAVD88
5. HISTORICAL GRADE INFORMATION BASED ON DIGITIZED
CONTOUR DATA FROM "MAYO E.G.P - ASH POND DAM" DRAWING
PREPARED BY CAROLINA POWER & LIGHT COMPANY DATED
FEBRUARY18,1983.
NOTES
1. FIELD VERIFICATION REQUIRED WHERE EXISTING GRADES DO
NOT MATCH HISTORICAL GRADES OUTSIDE APPROXIMATE ASH
BASIN WASTE BOUNDARY. CLOSURE BY EXCAVATION SHALL
MATCH GRADES AT THESE LOCATIONS.
2. 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 MEASURE 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.
0 20 40 60
VERTICAL SCALE (IN FEET)
0 200 400 600
HORIZONTAL SCALE (IN FEET)
NOT FOR CONSTRUCTION
FINAL CLOSURE GRADING CROSS
SECTIONS II
MAYO STEAM ELECTRIC PLANT
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY, NORTH CAROLINA
ISSUED FOR APPROVAL
DUKE
ENFRGYC
SCALE: AS NOTED
DES:
DMS
DWG TYPE :.DWG
DFTR :
DMS
JOB : 62
2019
DATE: 12
ENGR:
DMS
010-CROSS-SECTIONS.DWG
APPD:
DWC
DRAWING NO.
REVISION
MAY_C999.003.011
E
c-
70
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rn

MAY_C999.003.012
REV. A
A
0
C
A
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CHANNEL
LOW POINT
1 TORMWATER CHANNEL
O12 NOT TO SCALE
NOTES:
rolvk
LINED
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.
rL
CHANNEL
LOW POINT
2)STORMWATER CHANNEL SECTION - RIPRAP LINED
012 1
NOT TO SCALE
NOTES:
1. CHANNEL SECTIONS SHOULD INCLUDE A MINIMUM 2% GRADE TOWARD THE CENTERLINE OF THE CHANNEL.
GENERAL NOTES:
1. DETAILS ON THIS SHEET ARE TO BE
FINAL CONDITIONS, AND
THEREFORE SHOULD NOT BE BUILT
ON CCR MATERIALS.
3 TYPICAL CULVERT
O12 NOT TO SCALE
rL CL
ROADSIDE ROADSIDE
DITCH DITCH
4 TYPICAL HAUL / ACCESS ROAD
O12 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.
P"=com
N.C. ENGINEERING LICENSE NO.
F-0342
SEAL
�\ACARQ�oFESS/p�q y'9
SEAL
026889 (21 j oil
�OGFNGINE�-�
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012
NOT FOR CONSTRUCTION
FINAL CLOSURE GRADING DETAILS
MAYO STEAM ELECTRIC PLANT
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY, NORTH CAROLINA
FOR
ISSUED FOR APPROVAL
4ft) DUKE
ENEnf'*"*v®
SCALE: AS NOTED
DES:
DMS
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DFTR :
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JOB NO: 60603277
CHKD:
KK
DATE: 12/12/2019
ENGR :
DMS
FILENAME:
012-FINAL CLOSURE DETAILS.DWG
APPD:
DWC
DWG SIZE
DRAWING NO.
REVISION
ANSI D
22.0"x34.0"
MAY C999.003.012
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STORM EVENT
REFERENCE
1. TOPOGRAPHIC DATA PRESENTED IN THIS DRAWING IS TAKEN
FROM "AERIAL TOPOGRAPHIC SURVEY - MAYO PLANT" DATED
OCTOBER 31, 2015 PREPARED BY WSP FOR DUKE ENERGY.
3. APPROXIMATE ASH BASIN WASTE BOUNDARY PRESENTED IN THIS
DRAWING IS PREPARED BY SYNTERRA FOR DUKE ENERGY.
UPDATED SEPTEMBER 2018
4. BATHYMETRIC SURVEYS CONDUCTED BY WSP IN AUGUST 2014 &
FEBRUARY 2015. ISOLATED PONDS AROUND THE ASH BASIN ARE
INACCESSIBLE FOR SURVEY.
5. NO UNDERGROUND UTILITIES HAVE BEEN LOCATED OR MAPPED
FOR THIS PROJECT. THE LOCATION OF ANY AND ALL UTILITIES
SHOWN HEREON WHETHER PUBLIC/PRIVATE, ARE BASED ON
PHOTOGRAMMATIC MAPPING AND ARE APPROXIMATE ONLY.
6. BASIS OF BEARINGS: NC GRID NAD83/2011,ELEVATIONS ARE
BASED ON NAVD88.
7. THE WATERS OF THE US HAVE NOT BEEN APPROVED BY THE US
ARMY CORPS OF ENGINEERS AT THE TIME OF THE MAP
CREATION. THIS MAP IS A PRELIMINARY JURISDICTIONAL
DETERMINATION ONLY. THE PRELIMINARY WETLANDS AND
STREAMS BOUNDARIES WERE OBTAINED FROM AMEC FOSTER
WHEELER ENVIRONMENTAL & INFRASTRUCTURE, INC. NATURAL
RESOURCE TECHNICAL REPORT FOR MAYO STEAM ELECTRIC
PLANT DATED JANUARY 20, 2014.
N
TITLE
0 150 300 450
GRAPHIC SCALE (IN FEET)
NOT FOR CONSTRUCTION
ONSITE LANDFILL SCHEMATIC PLAN
MAYO STEAM ELECTRIC PLANT
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY, NORTH CAROLINA
FOR ISSUED FOR APPROVAL
D��E
R
ENERGY°
SCALE: 1" = 150'
DES: DMS
DWG TYPE :.DWG
DFTR : DMS
JOB N0: 60603277
CHKD: KK
DATE : 12/12/2019
ENGR : DMS
FILENAME: 017-ONSITE LANDFILL SCHEMATIC PLAN.DWG
APPD: DWC
DWG SIZE
DRAWING NO.
REVISION
ANSI D
22.0"x34.0"
MAY C999.003.013
0
C_
c
co
0
O
W
O
1
w
Z7
m
G
0 1 2 3 AI (TENTHS 10 20 30

MAY_C999.003.014 REV. A
0
0
C
0
moll
550
500
450
440
0+00
700
650
00
500
450
440
0+00
650
m
550
500
450
400
0+00
5+00 10+00 15+00 20+00
5+00 10+00 5+00 20+00
CROSS SECTION B-B
5+00 10+00 15+00 20+0021 +00
CROSS SECTION C-C
700
650
550
500
450
440
25+00
DURING LADFILL CONSTRUCTION UNDER
A SEPARATE COVER, ASH BASIN TO BE
FILLED WITH CLEAN SOIL FOR LANDFILL
SUBGRADE (SEE NOTE 1.2 IN GENERAL
NOTES, DRAWING NO. MAY_C999.003.002)
DURING LADFILL CONSTRUCTION UNDER
A SEPARATE COVER, ASH BASIN TO BE
FILLED WITH CLEAN SOIL FOR LANDFILL
SUBGRADE (SEE NOTE 1.2 IN GENERAL
NOTES, DRAWING NO. MAY_C999.003.002)
SITE VICINITY
SCALE: 1" = 1000'
I I=r_I=nln
EXISTING GRADE
PROPOSED FINAL GRADE
HISTORICAL GRADE (FINAL EXCAVATION GRADE)
CONCEPTUAL LANDFILL GRADE (SEE NOTE 1.2 IN
GENERAL NOTES, DRAWING NO. MAY_C999.003.002)
PRE -DECANTING GROUNDWATER
rxInTP:C
1. HISTORICAL TOPOGRAPHY SURVEY (DRAWING NO. RCD- 1580
ENTITLED "MAYO E.G.P. - ASH POND DAM SITE PLAN") PROVIDED
BY CAROLINA POWER & LIGHT COMPANY, REV 4 DATED 2/18/83.
AECOM DIGITIZED THE CONTOURS FROM THE TOPOGRAPHIC MAP
PROVIDED.
2. HISTORICAL TOPOGRAPHIC CONTOURS REFERENCED IN NOTE 1
WERE ASSUMED TO BE ESTIMATED BOTTOM OF ASH CONTOURS
AT THIS TIME.
3. 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 MEASURE 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.
0 200 400 600
HORIZ. SCALE (IN FEET)
0 50 100 150
VERT. SCALE (IN FEET)
NOT FOR CONSTRUCTION
TITLE
ONSITE LANDFILL SCHEMATIC PLAN -
PROFILES AND CROSS SECTIONS
P"=com MAYO STEAM ELECTRIC PLANT
CLOSURE BY EXCAVATION CLOSURE PLAN
PERSON COUNTY, NORTH CAROLINA
N.C. ENGINEERING LICENSE NO. FOR ISSUED FOR APPROVAL
F-0342
SEAL SCALE: 1" = 200' DES: DMS
IN CAIR? DUKE DWG TYPE :.DWG DFTR : DMS
�� SS �� JOB N0: 60603277 CHKD: KK
Q� '°�9 9 ENFK%.7Y®
SEAL DATE: 12/12/2019 ENGR : DMS
026889 1 Is/2019 FILENAME: 017-ONSITE LANDFILL SCHEMATIC PLAN.DWG APPD: KK
O FNGINEF-� �� DWG SIZE DRAWING NO. REVISION
ANSI D
22.0"x34.0" MAY_C999.003.014 A
0
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