WR0300115_Well Permit Application_20200619

& DUKE
AP ENERGY®
PROGRESS
June 19, 2020
Mr. Andrew Pitner, P.G.
North Carolina Department of Environmental Quality
Water Quality Regional Operations Section
Division of Water Resources
Mooresville Regional Office
610 East Center Avenue, Suite 201
Mooresville, North Carolina 28115
Subject: Recovery (Extraction) Well Permit Application
Duke Energy Carolinas, LLC
Allen Steam Station
Gaston County, NC
Mr. Pitner,
526 South Church St
Mail Code EC12J, EC13K
Charlotte, NC 28202
Duke Energy Carolinas, LLC (Duke Energy), is submitting the enclosed application package to
obtain a permit to install 30 recovery (extraction) wells as part of the pilot test phase of a
proposed groundwater remediation system at the Allen Steam Station (Site), located in Gaston
County, North Carolina.
As detailed in the Corrective Action Plan (CAP) Update Report (SynTerra 2019) , Duke Energy
is implementing a multi -component CAP, including source control through excavation of the
Retired Ash Basin, Active Ash Basin, storage areas, structural fills, and the Retired Ash Basin
Landfill; groundwater corrective action; and an effectiveness monitoring plan to track progress
during and after groundwater corrective action. The groundwater CAP includes provisions for a
robust groundwater remediation program that consists of using groundwater extraction wells
combined with clean water infiltration wells and associated treatment to address constituents
of interest (COI) concentrations in groundwater greater than applicable standards at or beyond
the Geographic Limitation for the ash basins.
The Application for Permit to Construct a Recovery Well System, including 26 wells to be
actively pumped from and 4 wells for hydraulic testing purposes, is attached, as well as
additional supporting information provided for your review and approval. We appreciate the
NCDEQ's timely review of this submittal package as we proactively implement the
groundwater remediation strategy for this Site. Please contact me at 980.373.6563 with any
questions or concerns regarding this application.
Sincerely,
Scott E. Davies, P.G.
Project Director
BUILDING A SMARTER ENERGY FUTURE"

cc: Brandy Costner, NCDEQ Division of Water Resources, Mooresville Regional Office
Steve Lanter, NCDEQ Division of Water Resources, Central Office
Eric Smith, NCDEQ Division of Water Resources, Central Office
Andrew Davis, Arcadis
Attachments
1 Permit to Construct a Recovery Well System
2 Site Location Figure
3 Pilot Test Layout Figure
4 Well Locations Figure
5 Vertical Saprolite/Transition Zone Extraction Well Construction Details Figure
6 Slanted Saprolite/Transition Zone Extraction Well Construction Details Figure
7 Bedrock Extraction Well Construction Details Figure
8 Extraction Well Construction Details Table

NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY - DIVISION OF WATER RESOURCES
APPLICATION FOR PERMIT TO CONSTRUCT A MONITORING OR RECOVERY WELL SYSTEM
PLEASE TYPE OR PRINT CLEARLY
In accordance with the provisions of Article 7, Chapter 87, General Statutes of North Carolina and regulations pursuant thereto,
application is hereby made for a permit to construct monitoring or recovery wells.
1. Date: June 19, 2020
2. County: Gaston
FOR OFFICE USE ONLY
PERMIT NO. ISSUED DATE
3. What type of well are you applying for? (monitoring or recovery): Recovery
4. Applicant: Duke Energy Carolinas, LLC Telephone:
Applicant's Mailing Address: 526 South Church St, Mail Code EC12J, Charlotte, NC, 28202
Applicant's Email Address (if available):
5. Contact Person (if different than Applicant): Scott Davies — Project Director Telephone: [phone]
Contact Person's Mailing Address: Duke Energy Carolinas, 526 South Church St, Mail Code EC12J, Charlotte, NC,
28202
Contact Person's Email Address (if available): [e-mail]
6. Property Owner (if different than Applicant): Same as above Telephone:
Property Owner's Mailing Address:
Property Owner's Email Address (if available):
7. Property Physical Address (Including PIN Number) 253 Plant Allen Road PIN 3592779998
City Belmont County Gaston Zip Code 28012
8. Reason for Well(s): Groundwater remediation
(ex: non -discharge permit requirements, suspected contamination, assessment, groundwater contamination, remediation, etc.)
9. Type of facility or site for which the well(s) is(are) needed: Coal fired power station
(ex: non -discharge facility, waste disposal site, landfill, UST, etc.)
10. Are there any current water quality permits or incidents associated with this facility or site? If so, list permit and/or incident no(s).
NPDES Permit NC0004979
11. Type of contaminants being monitored or recovered: inorganic constituents (cobalt, iron, manganese, strontium,
sulfate, TDS (ex: organics, nutrients, heavy metals, etc.)
12. Are there any existing wells associated with the proposed well(s)? If yes, how many? Yes, see Attachment 4
Existing Monitoring or Recovery Well Construction Permit No(s).: NA, historical on file
13. Distance from proposed well(s) to nearest known waste or pollution source (in feet): 100 — 600 feet
14. Are there any water supply wells located less than 500 feet from the proposed well(s)? No
If yes, give distance(s):
15. Well Contractor: TBD Certification No.:
Well Contractor Address:
PROPOSED WELL CONSTRUCTION INFORMATION
As required by 15A NCAC 02C .0105(f)(7), attach a well construction diagram of each well showing the following:
a. Borehole and well diameter —Attachments 5-7 e. Type of casing material and thickness — Attachments 5-7
b. Estimated well depth — Attachment 8 f. Grout horizons — Attachments 5-7
C. Screen intervals — Attachment 8 g. Well head completion details — Attachments 5-7
d. Sand/gravel pack intervals — Attachments 5 and 6

Continued on Reverse
PROPOSED WELL CONSTRUCTION INFORMATION (Continued)
2. Number of wells to be constructed in unconsolidated
material: 23 Attachment 8
3. Number of wells to be constructed in bedrock: 7
Attachment 8
4. Total Number of wells to be constructed: 30
Attachment 8
5. How will the well(s) be secured? Well vault;
locking J-plug or manifold Attachments 5-7
6. Estimated beginning construction date: July 2020
Estimated construction completion date: October 2020
ADDITIONAL INFORMATION
As required by 15A NCAC 02C .0105(f)(5), attach a scaled map of the site showing the locations of the following
a. All property boundaries, at least one of which is referenced to a minimum of two landmarks such as identified roads,
intersections, streams, or lakes within 500 feet of the proposed well or well system. See Attachment 2.
b. All existing wells, identified by type of use, within 500 feet of the proposed well or well system. See Attachment 4.
C. The proposed well or well system. See Attachment 3.
d. Any test borings within 500 feet of proposed well or well system. N/A
e. All sources of known or potential groundwater contamination (such as septic tank systems, pesticide, chemical or fuel
storage areas, animal feedlots as defined in G.S. 143-215.10B(5), landfills, or other waste disposal areas) within 500 feet
of the proposed well or well system. See Attachment 2.
SIGNATURES
The Applicant hereby agrees that the proposed well(s) will be constructed in accordance with approved specifications and conditions of
this Well Construction Permit as regulated under the Well Construction Standards (Title 15A of the North Carolina Administrative Code,
Subchapter 2C) and accepts full responsibility for compliance with these rules
OT 11-15-
Protect Director
Signature of Applicant or *Agent Title of Applicant or *Agent
Scott E. Davies ' If signing as Agent, attach authorization agreement stating
Printed name of Applicant or *Agent that you have the authority to act as the Agent.
If the property is owned by someone other than the applicant, the property owner hereby consents to allow the applicant to construct
wells as outlined in this Well Construction Permit application and that it shall be the responsibility of the applicant to ensure that the
well(s) conform to the Well Construction Standards (Title 15A of the North Carolina Administrative Code, Subchapter 2C).
Signature of Property Owner (if different than Applicant) Printed name of Property Owner (if different than Applicant)
DIRECTIONS
Please send the completed application to the appropriate Division of Water Resources' Regional Office:
Asheville Regional Office
2090 U.S. Highway 70
Swannanoa, NC 28778
Phone: [phone]
Fax: [phone]
Fayetteville Regional Office
225 Green Street, Suite 714
Fayetteville, NC 28301-5094
Phone: [phone]
Fax: [phone]
Mooresville Regional Office
610 East Ce
Mooresville,
Phone: (704
Fax: (704) 6
Raleigh Regional Office
3800 Barrett Drive
Raleigh, NC 27609
Phone: [phone]
Fax: [phone]
Washington Regional Office
943 Washington Square Mall
Washington, NC 27889
Phone: [phone]
Fax: [phone]
Wilmington Regional Office
127 Cardinal Drive Extension
Wilmington, NC 28405
Phone: [phone]
Fax: [phone]
Winston-Salem Regional Office
450 W. Hanes Mill Road
Suite 300
Winston-Salem, NC 27105
Phone: [phone]
Fax: [phone]
GW-22MR Rev. 3-1-2016

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NPDES OUTFALL 003 ,1
NPDES OUTFACE 0026
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LEGEND
• NPDES OUTFALL
RETIRED ASH BASIN
ISie WASTE BOUNDARY
RID ASH LANDFILL
y' 1 (PERMIT #3672-INDUS) COMPLIANCE BOUNDARY
L�f
NPDES OUTFALL 008
�y � NPDES OUTFACE 108
Au•4 ;['
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7 NPDES OUTFACE 108B
CATAWBA RIVER
ACTIVE ASH
(LAKE WYLIE)
BASIN
NPDES OUTFACE 104
NPDES OUTFACE 103
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' -�
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USGS The Na[ionel Mep: Ne6onel Boond— Dataset. 3DEP Elevation Program. G—graph,c Namos Information
System; National;Hydrogmphy Dataset, National Land Cover Database, Nallonal Slrual— Dala L and National
Transportation Da(aset', USGS Global Ecosystems; U.S. Census Bureau TIGERILInedata', USFS Road Dal,,'. Natr.i:
S Earth Data; U.S. Department of State Humanitarian Information Un II; and NOAANitional Centers for Environmental
Informal 'ion, U.S. Coastal Relief Model. Data refreshed E,b—,v!2d0jM L.''
I ALLEN STEAM STATION BUILDING
RETIRED ASH BASIN WASTE BOUNDARY
OACTIVE ASH BASIN WASTE BOUNDARY
ORETIRED ASH BASIN ASH LANDFILL
RETIRED ASH BASIN ASH LANDFILL
l — — 1 COMPLIANCE BOUNDARY
t — — 1 ASH BASIN GEOGRAPHIC LIMITATION
L— • ALLEN STEAM STATION PARCEL
- J BOUNDARY
NOTES:
1. BASEMAP IMAGERY SOURCE: UNITED STATES GEOLOGICAL SURVEY
7.5-MINUTE SERIES (TOPOGRAPHIC), BELMONT QUADRANGLE, 2019;
CHARLOTTE WEST QUADRANGLE, 2019.
2. WATER FEATURES DEPICTED WITHIN WASTE BOUNDARIES OF THE
ASH BASINS ON THE 2016 USGS TOPOGRAPHIC MAP DO NOT
REPRESENT CURRENT CONDITIONS. THE CONDITIONS DEPICTED
ARE SIMILAR TO THOSE SHOWN ON THE 1968 AND 1973 USGS
TOPOGRAPHIC MAPS OF THE AREA [(1968 WEST CHARLOTTE
(1:24000) AND 1973 BELMONT (1:24000)].
3. SOLID WASTE PERMIT NUMBER IS INCLUDED IN PARENTHESIS
FOR PERMITTED FACILITY.
4. ALL BOUNDARIES ARE APPROXIMATE.
5. PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
DUKE ENERGY
ALLEN STEAM STATION
GASTON COUNTY, NORTH CAROLINA
SITE LOCATION
PlARCADIS MI ` 2

0 200' 400'
GRAPHIC SCALE
BASE MAP SOURCE: LEGS Digital OMograpHic
Du—, OI(DODO), 2019.
BOUNDARYACTIVE ASH BASIN WASTE BOUNDARY
- - - ASH BASIN GEOGRAPHIC LIMITATION
RETIRED ASH BASIN ASH LANDFILL WASTE
COMIPLIANNCE BOUNDARY
ASH STORAGE AREAS AND STRUCTURAL FILLS
CURRENTMPNAGEMENTAECOAL PILE
-- DUKE ENERGY CAROLINAS PROPERTY LINE
0 CORRECTNEACTION GROUNDWATER
ABOVE GRADE TREATMENT SYSTEM PIPING
- - - - SUBSURFACE TREATMENT SYSTEM PIPING
0 MONITOR WELL(SHALLOW
ZONE)
0 MONITOR WELL(DEEP ZONE)
0 MONITOR WELL (BEDROCK
ZONE)
• (S=SHALLOW BR BEDROCK)LL
CLUSTER
I
WELL
SURFACE WATER STILLING
L
PROPOSED INFILTRATION
WELL
TE
PROPOSED D INFILTRATION
WELL
• NPDES OUTFALL
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DUKE
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IIIIIIBIIIII IIIII� S"NTED
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CAROLINAS
WELL "'UT
EouIVALENT)

0 600' 1,200'
GRAPHIC SCALE
BASE MAP SOURCE: USES Digital O..g.,hic
ON.., Ouad..gle (D000), 2019.
LEGEND
— AC—E AS. BASIN WASTE BOUNDARY
RETIRED ASH BASIN WASTE BOUNDARY
ASH DIASHE LIMITATIONOGRAPHIC AGWASH LANOEILLWASTE
BOUNDARY
PLIANCE BOUNDARY
ASH STORAGE AREAS AND STRUCTURAL FILLS
ORICAL AND CURRENT COAL PILE
MAIAGEMENTAREA
DUKE ENERGY CAROURAS PROPERTY
AORRECTOIVEACTIONRGROUNDWATERLINE
FLOW DIRECTION
�t MONITOR WELL (SHALLOW ZONE)
Q MONITOR WELL(DEEP ZONE)
0 MONILL(BEDROCKZONE)
• OSED EXTRACTION WELL CLUSTER
(G=SHALLOW. BR=BEDROCK)
m PROPOSED SLANTED N WELL
SURFACE WATER STILLING WELL
PROPOSED INFIH.TI—ION WELL
PROPOSED SLANTED INFILTRATION WELL
Erv5Iw5L — PILOTTESTLOATION
Ewslwrs�Ewlw FUU--ELOCATION DUKE
Its ENERGY
CARCLINAS

24" X 24" CONCRETE VAULT WITH
A HIGHWAY RATED COVER r 6" SEALED LOCKING CAP
CONCRETE APRON (48" X 48" SQUARE)
EXISTING GRADE SLOPED AWAY FROM WELL
CENTRALIZERS SF
BE PLACE[
50-FEET INTERV
TOTAL WELL DEPTH
* SEE FIGURE DIMEN:
"A" IN WELL TABLE
PORTLAND TYPE 1/11 NEAT CEMENT (TOP
OF BENTONITE SEAL TO SURFACE)
10" DIA. DRILLED HOLE
2-FEET BENTONITE PELLETS/CHIPS
SAND PACK
(BOTTOM OF WELL TO 2 FT. ABOVE WELL SCREEN)
DEPTH OF WELL SUMP
* SEE FIGURE DIMENSION "C"
IN WELL TABLE
WELL MATERIALS:
1. SAPROLITE AND TRANSITION ZONE EXTRACTION WELLS WILL BE
CONSTRUCTED OF 10-FT. LONG, 6-INCH DIAMETER 0.010-INCH SLOTTED
STAINLESS -STEEL WIRE -WRAPPED SCREEN AND SCHEDULE 80 POLYVINYL
CHLORIDE (PVC) RISER.

MAIN COAL PILE
EXISTING GRADE
48" X 48" CONCRETE VAULT WITH
A HIGHWAY RATED COVER
6" SEALED LOCKING CAP
PORTLAND TYPE 1/11 NEAT CEMENT (TOP
OF BENTONITE SEAL TO SURFACE)
APPROXIMATE GROUNDWATER TABLE (12 FT DEEP)
CONCRETE APRON J
(48" X 48" SQUARE) CENTRALIZERS SHALL BE
SLOPED AWAY FROM PLACED AT 50-FEET INTERVALS
WELL
SAPROLITE/TRANSITION ZONE
SLANTED EXTRACTION WELL
10" DIA. DRILLED HOLE
SAND PACK
SAPROLITE ZONE (BOTTOM OF WELL TO 2 FT.
(EST 50 TO 80 FT THICK) ABOVE WELL SCREEN)
2-FEET OF BENTONITE PELLETS/CHIPS
TOTAL WELL DEPTH
* SEE FIGURE DIMENSION "A" IN
WELL TABLE
v
••TRANSITION ZONE ; ............. -10-20 FT THICK -
✓Q
JJ :;
BEDROCKZONE
FEET 0
DEPTH OF WELL SUMP J 75
* SEE FIGURE DIMENSION "C"
IN WELL TABLE
700
WELL MATERIALS:
1. SAPROLITE/TRANSITION ZONE SLANTED EXTRACTION WELLS WILL BE
CONSTRUCTED OF 10-FT. LONG, 6-INCH DIAMETER 0.010-INCH SLOTTED
STAINLESS -STEEL WIRE -WRAPPED SCREEN AND SCHEDULE 80 POLYVINYL
CHLORIDE (PVC) RISER.

24" X 24" CONCRETE VAULT WITH
A HIGHWAY RATED COVER r 10" SEALED LOCKING CAP
EXISTING GRADE
TOTAL WELL DEPTH
* SEE FIGURE DIMEN;
"A" IN WELL TABLE
CONCRETE APRON (48" X 48" SQUARE)
SLOPED AWAY FROM WELL
14" DIA. DRILLED HOLE
PORTLAND TYPE 1/II NEAT CEMENT
(TOP OF FINE SAND TO SURFACE)
CONDUCTOR CASING - SCH 80
PVC * SEE FIGURE DIMENSION
"B" IN WELL TABLE
9 8.
Z' DIA. DRILLED HOLE
OPEN BOREHOLE
WELL MATERIALS:
1. THE CONDUCTOR CASING WILL BE INSTALLED TO A MINIMUM DEPTH OF 10 FT
INTO COMPETENT BEDROCK.
2. BEDROCK EXTRACTION WELLS WILL BE COMPLETED AS OPEN BOREHOLE
WELLS IF BEDROCK INTEGRITY WITHIN THE BOREHOLE REMAINS STABLE. IF
THE BOREHOLE IS NOT STABLE, BEDROCK EXTRACTION WELLS WILL BE
CONSTRUCTED OF 10-FT LONG, 6-INCH DIAMETER 0.010-INCH SLOTTED
STAINLESS -STEEL WIRE -WRAPPED SCREEN AND SCHEDULE 80 POLYVINYL
CHLORIDE (PVC) RISER.

Attachment 8
Extraction Well Construction Details
Duke Energy - Allen Steam Station
Gaston County, North Carolina
Vertical (See Attachments 5 and 7)
ARCADIS hui[tilas5e��'il .r
EX-1
STZ
118
--
--
6
6
108
-
118
119
EX-2
STZ
118
6
6
108
-
118
119
EX-3
STZ
118
6
6
108
-
118
119
EX-4
STZ
107
6
6
108
-
118
119
EX-5
STZ
77
6
6
108
-
118
119
EX-9
STZ
83
6
6
73
83
84
EX-10
STZ
83
6
6
73
83
84
EX-11
STZ
87
6
6
77
87
88
EX-12
STZ
88
6
6
78
88
89
EX-13
STZ
93
6
6
78
88
89
EX-14
STZ
100
6
6
78
88
89
EX-15
STZ
125
6
6
78
88
89
EX-36*
STZ
117
6
6
112
-
122
123
EX-42*
STZ
139
--
--
6
6
107
-
117
118
EX-55*
STZ
104
--
--
6
6
94
-
104
105
EX-67*
B
365
10
85
--
--
--
1 368
EX-70
STZ
115
--
--
6
6
87
97
116
EX-75
STZ
97
6
6
87
97
98
EX-76
STZ
127
--
--
6
6
117
-
127
128
EX-82
B
224
10
110
--
227
EX-83
B
115
10
105
118
EX-84
B
215
10
105
218
EX-85
B
208
10
100
--
--
--
-
--
211
EX-86
B
205
10
95
208
EX-87
B
202
10
90
205
Slanted (See Attachment 6)
SLEX-16
STZ
168
6
6
78
88
169
SLEX-18
STZ
147
6
6
94
104
148
SLEX-19
STZ
157
6
6
101
-
ill
158
SLEX-20
STZ
163
--
--
6
6
105
-
115
164
SLEX-21
STZ
173
6
6
112
-
122
174
Notes:
a. Well locations are based on preliminary site information. Locations are subject to change for constructability.
b. Final well depths, screen lengths, and casing lengths will be based on the geology encountered and not the preliminary depth proposed.
*- Well installed for pump test only, not connected to pilot test system.
Acronyms and Abbreviations:
-- = not applicable
amsl = above mean sea level
B = Bedrock
bgs = below ground surface
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