WV0400057_Requestion for Well Variance_20220516

May 9, 2022
Mr. Jim Gonsiewski
North Carolina Department of Environmental Quality
Division of Water Quality, Aquifer Protection Section
450 Hanes Mill Road, Suite 300
Winston-Salem, North Carolina 27105
Sent via email [e-mail]
Subject:
Application for Permit to Construct Recovery (Extraction) Wells
Duke Energy Carolinas, LLC
Belews Creek Steam Station
Belews Creek, NC 27009
Dear Mr. Gonsiewski:
Duke Energy Carolinas, LLC (Duke Energy), is submitting the enclosed application package to obtain a
permit to install 49 recovery (extraction, EX) wells as part of the full-scale groundwater remediation
system at the Belews Creek Steam Station (Site), located in Belews Creek, North Carolina (Figure 1). As
part of a pilot study, twenty-three groundwater extractions wells were installed under well permit
WV0400056 in the Fall of 2020.
As detailed in the Corrective Action Plan (CAP) Update Report (SynTerra, 2019) and the Demonstration
of 02L Compliance for the Belews Creek Ash Basin technical memorandum (Tech Memo) (SynTerra,
2020), 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 occurs 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 are present 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 49 extraction wells with well
screen and/or sand pack across all three zones (Table 1). Figures 2 and 3 illustrate the approximate

Mr. Jim Gonsiewski
May 9, 2022
locations of the proposed extraction wells. Final locations will be determined in the field during
construction and surveyed by a licensed surveyor.
Given the interconnectivity of the hydrostratigraphic zones and consistent with the pilot study well
construction (permit WV0400056), 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.
• Due to expected low well yield in some areas (less than two gallons per minute), constructing
recovery wells to extract water from a specific water -bearing unit would not provide sufficient well
yield to effectively remediate groundwater at the site.
• 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 Mr. Scott Davies (980.373.6563) with any questions or concerns regarding this
application.
Sincerely,
(5'con t-Z2a (,,,
Scott E. Davies, P.G.
Project Director
Copies:
Bob Wyrick, PG, AECOM
Enclosures:
Attachments

North Carolina Department of Environmental Quality (DEQ) — Division of Water Resources (DWR)
VARIANCE APPLICATION FOR WELL CONSTRUCTION STANDARDS:
WATER SUPPLY WELLS UNDER 15A NCAC 02C .0107
All water supply wells not considered "Private Drinking Water Wells'' and including irrigation, industrial, and commercial wells.
WELLS OTHER THAN WATER SUPPLY UNDER 15A NCAC 02C .0108
Including monitoring and recovery wells.
PRIVATE DRINKING WATER WELLS UNDER 15A NCAC 02C .0300
Print clearly or type information. Illegible submittals will be returned as incomplete.
DATE: 05/09 , 2022
Existing permit number (if applicable) N/A Issued Date: N/A Exp. Date: N/A
Permit No. for new projects (to be completed by DWR/DPH)
A. WELL OWNER(S) — For single family residences, list all persons appearing on property deed. For all others, list name
of the business/government agency and person and title with delegated signature authority:
Duke Energy Carolinas, LLC; Mr. Scott Davies Project Director
Mailing Address: 526 South Church St Mail Code EC12J
City: Charlotte State: NC Zip Code: 28202 County: Mecklenburg
Day Tele No.: 980-373-6563 Ce11 No.: 704-661-6823
EMAIL Address:
scott.davies@a,duke-energy.com Fax No.:
B. PHYSICAL LOCATION OF WELL SITE
(1) Parcel Identification Number (PIN) of well site: 6982642715, 6982185694
County: Stokes
(2) Physical Address (if different than mailing address): Belews Creek Steam Station 3195 Pine Hall
Road
City: Walnut Cove
C. WELL DRILLER INFORMATION (if known)
Well Drilling Contractor's Name: Brian Thomas
NC Well Drilling Contractor Certification No.: 2581-A
Company Name:
City: Statesville
County: Stokes Zip Code: 27009
Geologic Exploration, Inc. Contact Person: Steve Taylor
State: NC Zip Code:28625 County: Iredell
Day Tele No.: 704-872-7686 Cell No.: 704-902-4211
EMAIL Address: staylor(@,gexnc.com Fax No.:
GW-22V Variance Request Form Rev. 7-13-2020 Page 1

D. REASON FOR VARIANCE REQUEST — Include type of well(s) to be constructed; rule for which the variance is
being requested; description of how the alternate construction will not endanger human health and welfare and the
environment; and reason why construction and/or operation in accordance with the standards is not technically feasible
and/or provides equal or better protection of the groundwater (refences to attached documents are acceptable).
Groundwater flow and transport modeling suggest site -related constituents of interest (COIs) are present from the
saprolite into the bedrock flow zone. Based on the distribution of COIs and the vertical hydraulic connection through
the saprolite, transition, and bedrock zones, Duke Energy is proposing to install 49 extraction wells with well screen
and/or sand pack across all three zones (Table 1). Corrective action to address these COIs 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.
This same approach was previously approved by the NCDEO for the recovery wells installed as part of the pilot test
in 2020.
The proposed well construction is not expected to generate a potential risk to human health or groundwater. Due to
expected low well yield (less than two gallons per minute), constructing recovery wells to extract water from a specific
water -bearing unit would not provide sufficient well yield to effectively remediate groundwater at the site.
E. ATTACHMENTS — Provide the following information as attachments to this application:
(1) A map showing general location of the property (including road names, NC State Route Number, distances, any
key landmarks, etc.) sufficient for finding the well location.
(2) Detailed site map with scale showing location of proposed well relevant to septic system(s), building
foundations, property lines, water bodies, potential sources of contamination, other wells, etc.
(3) Submit a copy of the local well permit application and site evaluation map (if applicable).
(4) Any other information relevant to the variance request such as a well construction diagram showing proposed
well liner or atypical construction materials/methods.
F. SIGNATURE(S)
5C-et& Z7a
Signature(s) of Well/Property Owner(s)
Scott Davies, Project Director, Duke Energy
Print or Type Well/Property Owner(s)
Signature of Person Responsible for Well Construction
(Typically, the well driller)
Steve Taylor
Print or Type Name of Person Responsible for Well Construction
(Typically, the well driller)
Signature of County Environmental Health Specialist (for Private Water Wells)
Print or Type Full Name and Title of County Environmental Health Specialist (for Private Water Wells)
Per 15A NCAC 02C .0118 the Secretary of the Division of Water Resources or the Division of Public Health may require
submittal of information deemed necessary to make a decision on the variance, may impose conditions as part of the
decision, and shall respond in writing to the request within 30 days of receipt of the variance request. A variance
applicant who is dissatisfied with the decision of the Director may commence a contested case by filing a petition as
described in G.S. 150B-23 within 60 days after receipt of the decision.
GW-22V Variance Request Form Rev. 7-13-2020 Page 2

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`ASH BASIN GEOGRAPHIC LIMITATION
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J\�r .S PINE HALL Z._
j '`� /r ``• y f ROAD LANDFILL L_A,. .),4 • ,�`I
(CLOSED)Y STRUCTURAL FILL
NOTES:
1. 2018 USGS TOPOGRAPHIC MAP, BELEWS LAKE QUADRANGLE,
OBTAINED FROM THE USGS STORE AT https://store.usgs.gov/map-locator.
2. THE LOCATIONS OF ALL BOUNDARIES, REMEDtATION AND MONITORING WELLS, AND
WETLANDS WERE PROVIDED BY SYNTERRA CORPORATION AND ORIGINALLY DOCUMENTED
IN THE CORRECTIVE ACTION PLANUPDATE (DECEMBER 2019)AND THE DEMONSTRATION
OF 02L COMPLIANCE FOR THE BELEWS CREEK ASH BASIN BY DECEMBER 31, 2019 TECHNICAL
MEMORANDUM (MARCH 2020)AND SHOULD BE CONSIDERED APPROXIMATE.
l> NERGY.
CAROLINAS
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BELEWS CREEK STEAM STATION
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FIGURE 1: SITE LOCATION MAP
BELEWS CREEK STEAM STATION
PILOT TEST WORK PLAN BELEWS CREEK,
NORTH CAROLINA
DRAWN BY: G. Palmer
REVISED BPATE:
CHECKED BY:
APPROVED BY:
PROJECT MANAGER:
DATE: 03f302022
DATE:
DATE:
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AECOM
Client: Duke Energy
Project Number: 60680712
WELL ID: See Table
Site Location: Belews Creek, NC
Date Installed: Proposed
Well Location:
Proposed Coords: Proposed
Inspector:
Method: Air Rotary
Contractor: TBD
GENERALIZED PROPOSED EXTRACTION WELL CONSTRUCTION DIAGRAM
Measuring Point
for Surveying &
Water Levels
Cement, Bentonite,
Bentonite Slurry
Grout, or Native
Materials
5 % Cement
% Bentonite
% Native
Materials
Depth from G.S. (feet) Elevation(feet)
Datum
0.0
Top of Riser Pipe
Ground Surface (GS) 0.0
_Top of Cement 0.75 ft
Bo ehole Diamete :
Describe Measuring Point:
Land Surface
Riser Pipe:
Length 150 ft
Inside Diameter (ID) 6-in
Type of Material PVC
Bottom of Steel Guard Pipe
Top of Bentonite
Bentonite Seal Thickness
Top of Sand
10ft
NA
40 ft
50 ft
Top of Screen 150 ft
Stabilized Water Level
Screen:
Length 20 ft
Inside Diameter (ID) 6-in
Slot Size 0.01 in
Type of Material PVC
TypelSize of Sand
Sand Pack Thickness up to 150 ft
#2
Bottom of Screen
Bottom of Tail Pipe: PVC Threaded Plug
Bottom of Borehole
10-in Approved:
Unknown
170 ft
175 ft
175 ft
Signature Date