WR0300116_Well 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
Marshall Steam Station
Terrell, NC 28682
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 32 recovery (extraction) wells as part of the pilot test phase of a
proposed groundwater remediation system at the Marshall Steam Station (Site), located in
Terrell, North Carolina.
As detailed in the Corrective Action Plan (CAP) Update Report (SynTerra 2019)1, Duke
Energy is implementing a multi -component CAP, including source control through excavation
of the Ash Basin and capping of existing on -site landfills, 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 of the Ash Basin.
As discussed in the CAP Update (SynTerra 2019), groundwater in the area of the Site is
presented in three interconnected hydrostratigraphic zones:
The shallow flow zone in soils and saprolite (saprolite zone),
The transition flow zone (referred to as "deep" in some previous reports); and
The bedrock flow zone.
Groundwater flow and transport modeling suggest site -related COI extend from the saprolite
into the bedrock flow zone. Based on the distribution of COI and the vertical hydraulic
connection through the saprolite, transition, and bedrock zones, Duke Energy is proposing to
install select extraction wells (EX-11 SBR through EX-22SBR and EX-56SBR through EX-
66SBR) as individual extraction wells, screened across all three zones. Given the
SynTerra. 2019. Correction Action Plan Update — Marshall Steam Station.
BUILDING A SMARTER ENERGY FUTURE"

interconnectivity of the hydrostratigraphic zones, Duke Energy is requesting a variance from
15A NCAC 02C .0108 North Carolina Well Construction Standards in accordance with 15A
NCAC 02C .0105, based on the following:
• Construction of extraction wells with screens across the three water -bearing units will
allow for more effective remediation of groundwater.
• Site -related COI are present in groundwater in all three zones.
• Corrective action to address these COI in groundwater is also proposed in all three
zones.
• Extraction of groundwater provides the necessary hydraulic connection between the
COI- affected groundwater zones and the proposed clean water infiltration, which
targets the saprolite and transition zones.
• The proposed well construction is not expected to generate a potential risk to human
health or groundwater.
• Water supply wells are not located within 500 feet of the proposed extraction wells.
The Application for Permit to Construct a Recovery Well System 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,
S JIFF �
L l �_
Scott E. Davies, P.G.
Project Director
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 Saprolite/Transition Zone/Bedrock Extraction Well Construction Details
5 Bedrock Extraction Well Construction Details
6 Extraction Well Construction Summary 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.
FOR OFFICE USE ONLY
1. Date: June 19, 2020
2. County: Catawba 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): scott.davies(a)duke-energv.com
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) 8320 NC-150, PIN Number 461803426350
City Terrell County Catawba Zip Code 28682
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 NC0004987
11. Type of contaminants being monitored or recovered: Inorganic constituents (antimony, barium, beryllium, boron,
chloride, cobalt, iron, lithium, manganese, molybdenum, selenium, strontium, sulfate, thallium, total dissolved solids
(TDS), total radium, and vanadium (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 3
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): 20 to 400 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 4-6 e. Type of casing material and thickness — Attachments 4 and 5
b. Estimated well depth — Attachment 6 f. Grout horizons — Attachments 4 and 5
c. Screen intervals -- Attachment 6 g. Well head completion details —Attachments 4 and 5
d. Sand/gravel pack intervals — Attachments 4 and 5
Continued on Reverse

PROPOSED WELL CONSTRUCTION INFORMATION (Continued)
2. Number of wells to be constructed in unconsolidated 5. How will the well(s) be secured? Well vault; Locking
material: 23 See Attachment 6 J-plug or manifold See Attachments 4 & 5
3. Number of wells to be constructed in bedrock: 32 6. Estimated beginning construction date: July 2020
See Attachment 6
4. Total Number of wells to be constructed: 32 7. Estimated construction completion date: October 2020
(add answers from 2 and 3) See Attachment 6
ADDITIONAL INFORMATION
1. 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 3.
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
Proiect Director
Signature of Applicant or *Agent
Scott E. Davies
Printed name of Applicant or *Agent
Title of Applicant or *Agent
* If signing as Agent, attach authorization agreement stating
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
Raleigh, NC 27609
Fax: [phone]
2090 U.S. Highway 70
Phone: [phone]
Swannanoa, NC 28778
Fax: [phone]
Winston-Salem Regional Office
Phone: [phone]
450 W. Hanes Mill Road
Fax: [phone]
Washington Regional Office
Suite 300
943 Washington Square Mall
Winston-Salem, NC 27105
Fayetteville Regional Office
Washington, NC 27889
Phone: [phone]
225 Green Street, Suite 714
Phone: [phone]
Fax: [phone]
Fayetteville, NC 28301-5094
Fax: [phone]
Phone: [phone]
Fax: [phone]
Mooresville Regional Office
610 East Center Avenue
Mooresville, NC 28115
Phone: [phone]
Fax: [phone]
GW-22MR Rev. 3-1-2016
Raleigh Regional Office
3800 Barrett Drive
Wilmington Re ion
127 Cardinal Driv
Wilmington, NC 28405
Phone: [phone]
GW-22M (Rev. 5/11)
GW-22MR (6/11)

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LEGEND
�•_•_j LANDFILL COMPLIANCE BOUNDARY
_ 1 ASH BASIN GEOGRAPHIC LIMITATION
7 ASH BASIN
MARSHALL STEAM STATION PARCEL BOUNDARY
NOTES:
1. BASEMAP IMAGERY SOURCE: UNITED
STATES GEOLOGICAL SURVEY
7.5-MINUTE SERIES (TOPOGRAPHIC),
LAKE NORMAN NORTH QUADRANGLE,
2019.
2. SOLID WASTE PERMIT NUMBERS ARE
INCLUDED IN PARENTHESES FOR
PERMITTED FACILITIES.
3. ALL BOUNDARIES ARE APPROXIMATE.
4. PROPERTY BOUNDARY PROVIDED BY
DUKE ENERGY CAROLINAS.
DUKEENERGY
MARSHALL STEAM STATION
TERRELL, NORTH CAROLINA
SITE LOCATION
ATTACHMENT
P ARCADIS In I� �;Vw`y
2

^.
If w
E It `
e
CCR-16D CCR-165 i GWA-7S
GWA-7D
PROPOSED DUST
SUPPRESSION
SYSTEM
i
CCR-15S EX-8SBR
EX-7SBR 1
_ ­W11111"FF. w EX-3SBR
MW-14S
EX-2SBR
EX 14D GWA-10S BORRO
APPA
® EX-1SBR
GWA-10D
_
7 .EX-.�_- O n _
• Q 5B
CIO
1�0
CCR'1451 p EMP4 .'
I O EMP4D
1
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CCR-14D AL 16 Q EMP-4BR MODULAR EXTRACTION CONTROL
AL-1 S
AND PUMPING SYSTEM
Al-1D O
-
AREA OF SURFACE ASH AL-1BRL
O IN
•
REMOVAL PRIOR TO INSTALL
.p nIN- %- _ . INFILTRATION SYSTEM
IN-15 -- �
�
PROPOSED 21,000 GALLON - O � -.--(� AWL-1I AND EQUALIZATION TANK
EXTRACTION SYSTEM TANK CCR-13D
Oi 5S
' O 11 GWA-15D
DRY ASH LANDFILL CCR-13S MW-1 p
(PHASE 1)
-
GWA-11S
Q\ p23SeR EX-2sSeR
GWA-11D F SECONDARY CONTAINMENT
CCR-12S
GWA-11BR `
r. a
CCR-12D FX-'� rX- 4bkR O Ex-2LSBR
EX 2�85_B
\ O NPDES OUTFALL 007
-
\ O EX-29SBR
EXISTING EX-30SBR
ASH BASIN DECANT SYSTEM -nS O O EX-31 BR
pExEX-33
CCR-11D 0EX-33BR
O EX-34BR
44,
AB-1BR' 3 R
RL/ PROPOSED INFILTRATION
AAB-61D/
EMP-3S WATER TREATMENTS ST
AB-1Si
EMP-31D
EXISTING AB-1BRLL' EMP-3BR
TREATED WATER DISCHARGE LLL
LINE TO NPDES OUTFALL 002 AB-1 BR
EXa3B MW-7S 9
ASH BASIN DAM MW 7D t
\
EX-44SR MW-10S
.A2 N
i E4- 5BR
i
7BR MW-8S NPDES OUTFALL 002
-). MW-8D
i EX-4$$@. PROPOSED
_
�,! INFILTRATION INTAKE
EX-`WBBM FT. FROM
W-9S (i:300
SHORELINE)
EX -,A
AB-2BR i MW-9D APPROXIMATE DAM LIMITS
AB-2S X$1 AND 50 FT. BUFFER
1 -_.d R.r.:--. -
NOTES
1. ALL BOUNDARIESAREAPPROXIMATE.
2. PROPERTY BOUNDARY PROVIDED BY DUKE
LEGEND
[
ENERGY CAROLINAS.
- — - ASH BASIN GEOGRAPHIC LIMITATION
0 MONITOR WELL (SHALLOW ZONE)
MARSH
3. DASHED TREATMENT SYSTEM PIPING INDICATES
_ ASH BASIN WASTE BOUNDARY
MONITOR WELL (DEEP ZONE)
TERREL
BURIED PIPE.
4. SOLID TREATMENT SYSTEM PIPING INDICATES
0 MONITOR WELL (BEDROCK ZONE)
ABOVE GROUND PIPE.
— LANDFILL BOUNDARY
0 PROPOSED MONITORING WELL
D 400' 800'
__ -LANDFILL COMPLIANCE BOUNDARY
• PROPOSED EXTRACTION WELL
--- DUKE ENERGY CAROLINA$ MARSHALL
(SBR= SAPROLITEJTRANSITION/BEDROCK ZONE
PILO'
STEAM STATION SITE BOUNDARY
BR= BEDROCK ZONE)
GRAPHIC SCALE
AREA PROPOSED FOR GROUNDWATER
0 CORRECTIVE ACTION
PROPOSED INFILTRATION WELL
FLOW DIRECTION
SURFACE WATER STILLING WELL
NPDES OUTFALL
•
/w\D
BASE MAP SOURCE: USGS Digital OM.g.pBic
PILOT TEST LOCATION
/�,\��
Duna. D-d—gle(DODD), 2018.
— FULL-SCALE LOCATION

24" X 24" CONCRETE VAULT WITH
A HIGHWAY RATED COVER
EXISTING GRADE
CENTRALIZERS SF
BE PLACE[
50-FEET INTERV
TOTAL WELL DEPTH
* SEE FIGURE DIMEN:
"A" IN WELL TABLE
6" SEALED LOCKING CAP (PRIOR TO SYSTEM CONNECTION)
CONCRETE APRON (48" X 48" SQUARE)
SLOPED AWAY FROM WELL
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/TRANSITION/BEDROCK ZONE EXTRACTION WELLS
WILL BE CONSTRUCTED OF 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 (PRIOR TO SYSTEM CONNECTION)
EXISTING GRADE
TOTAL WELL DEPTH
SEE FIGURE DIMENc
"A" IN WELL TABLE
CONCRETE APRON (48" X 48" SQUARE)
SLOPED AWAY FROM WELL
14" DIA. DRILLED HOLE
PORTLAND TYPE 1/11 NEAT CEMENT
(TOP OF FINE SAND TO SURFACE)
CONDUCTOR CASING - SCH 80
PVC' SEE FIGURE DIMENSION
"B" IN WELL TABLE
9 7" DIA. DRILLED HOLE
OPEN BOREHOLE
WELL MATERIALS:
1. THE CONDUCTOR CASING WILL BE INSTALLED TO A MINIMUM DEPTH OF 10 FT
INTO COMPETANT 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 6-INCH DIAMETER, 0.010-INCH SLOTTED
STAINLESS -STEEL WIRE -WRAPPED SCREEN AND SCHEDULE 80 POLYVINYL
CHLORIDE (PVC) RISER.

Attachment 6
Extraction Well Construction Summary Table
Duke Energy - Marshall Steam Station
Terrell, North Carolina
1AARCAD IS
Target
Hydrostratigraphic
Unit
Wells (See Attachments 4 and 5)
EX-11SBR S, TZ, B
Total Well Casing
DeMpth Diameter
(ft bgs) (inches)
165 6.0
Screen
Diameter
(inches)
Screen
Interval
(ft
bgs) 7
165 100
ump Depth
(ft bgs)
6.0
65
166
EX-12SBR
S, TZ, B
163
6.0
6.0
63
163
100
164
EX-13SBR
S, TZ, B
166
6.0
6.0
66
166
100
167
EX-14SBR
S, TZ, B
157
6.0
6.0
62
157
95
158
EX-15SBR
S, TZ, B
160
6.0
6.0
60
160
100
161
EX-16SBR
S, TZ, B
171
6.0
6.0
71
171
100
172
EX-17SBR
S, TZ, B
183
6.0
6.0
78
183
105
184
EX-18SBR
S, TZ, B
190
6.0
6.0
85
- 190
105
191
EX-19SBR
S, TZ, B
190
6.0
6.0
85
- 190
105
191
EX-20SBR
S, TZ, B
193
6.0
6.0
88
- 193
105
194
EX-21SBR
S, TZ, B
180
6.0
6.0
75
180
105
181
EX-22SBR
S, TZ, B
177
6.0
6.0
72
177
105
178
EX-35BR*
B
250
10.0
90
6.0
6.0
100
250
150
251
EX-37BR*
B
260
10.0
95
6.0
6.0
105
260
155
261
EX-38BR*
B
250
10.0
85
6.0
6.0
95
250
155
251
EX-41BR*
B
235
10.0
85
6.0
6.0
1 95
235
140
236
EX-42BR*
B
220
10.0
80
6.0
6.0
90
220
130
221
EX-45BR*
B
235
10.0
75
6.0
6.0
85
235
150
236
EX-46BR*
B
235
10.0
75
6.0
6.0
85
235
150
236
EX-52BR*
B
190
10.0
35
6.0
6.0
45
190
145
191
EX-53BR*
B
205
10.0
45
6.0
6.0
57
207
150
208
EX-56SBR
S, TZ, B
138
6.0
6.0
48
- 138
90
139
EX-57SBR
S, TZ, B
135
6.0
6.0
40
- 135
95
136
EX-58SBR
S, TZ, B
141
6.0
6.0
46
j-j 141
1 95
1 142
EX-59SBR
S, TZ, B
152
6.0
6.0
57
- 152
95
153
EX-60SBR
S, TZ, B
169
6.0
6.0
69
169
100
170
a

Attachment 6
Extraction Well Construction Summary Table
Duke Energy - Marshall Steam Station
Terrell, North Carolina
1AARCADIS
EX-61SBR
S, TZ,B
166
6.0
6.0
66
166
100
167
EX-62SBR
S, TZ,B
169
6.0
6.0
69
169
100
170
EX-63SBR
S, TZ,B
176
6.0
6.0
76
176
100
177
EX-64SBR
S, TZ,B
170
6.0
6.0
70
170
100
171
EX-65SBR
S, TZ,B
151
6.0
6.0
56
151
95
152
EX-66SBR
S. TZ. B
161
--
--
6.0
6.0
61
161
100
162
Notes:
a. Well locations are based on preliminary site information. Locations are subject to change for constructability.
b. Select well locations may vary based on the results of landfill delineation activities.
c. Final well depths, screen lengths, and casing lengths will be based on the geology encountered and not the preliminary depth proposed.
d. Wells installed within only the bedrock zone are intended to be installed as open borehole wells; from the base of the surface casing to the total well depth provided.
e. Screened wells will be installed in bedrock with the construction details provided at locations where open borehole wells are not feasible due to bedrock instability.
"- 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
fl = feet
S = Saprolite
TZ = Transition Zone
a