Roxboro EAB - CBE - Closure Report_20200107

f
� DUKE
ENERGY.
December 30, 2019
Ms. Sheila Holman
Assistant Secretary for Environment
North Carolina Department of Environmental Quality
1611 Mail Service Center
Raleigh, North Carolina 27699-1611
Paul Draovitch
Senior Vice President
Environmental, Health & Safety
526 S. Church Street
Mail Code: EC3XP
Charlotte, NC 28202
[phone]
Subject: Submittal of Ash Basin Closure Plan and Corrective Action Plan Update
Roxboro Steam Electric Plant
Dear Ms. Holman:
In accordance with the requirements of N.C.G.S. §§ 130A-309.21 1 (b) and .214(a)(4), Duke
Energy provides the following documents: (1) a plan for basin closure by excavation, and (2) a
corrective action plan (CAP) for the Roxboro site, which will address groundwater impacts within
9 years of full-scale operation, regardless of the specific closure method.
Closure by Excavation
The enclosed excavation plan is in response to NCDEQ's April 1 order requiring excavation of
the Roxboro coal ash basins. After regulatory approval, excavating the basin ash would require
15 years to move the ash to a new lined landfill within plant property. The landfill would be
located in the prior footprint of the East Ash Basin adjacent to Dunnaway Road, rising about 180
feet above the road.
Continuing to Protect Water Resources
Robust scientific study, conducted under the direction of NCDEQ, demonstrates that drinking
and recreational water supplies around the Roxboro facility are well -protected from coal ash
impacts and will only continue to improve during and after closure. Ongoing research and
monitoring also provide a detailed understanding of groundwater conditions at the site,
indicating that the impact is highly localized and will be addressed through the planned CAP
approach. The West Ash Basin is currently in compliance with state groundwater standards at
the compliance boundary. The CAP designed for Roxboro will achieve groundwater standards
at the East Ash Basin through a combination of strategically placed groundwater extraction
wells coupled with clean water infiltration wells.
Prior to submission, the closure plan was reviewed by the National Ash Management Advisory
Board (NAMAB), which consists of nationally and internationally recognized and published
experts with practical experience working with and for the private sector, federal government,
and academia. NAMAB helped develop the guiding principles for safe basin closure and their
feedback is incorporated herein.
Duke Energy remains committed to safely and permanently closing basins in ways that continue
to protect people and the environment and welcomes the opportunity to work constructively with
NCDEQ to move forward.

Ms. Sheila Holman
December 30, 2019
Submittal of Ash Basin Closure Plan and Corrective Action Plan Update
Roxboro Steam Electric Plant
Page 2
SizDraovi
Pach
Senior Vice President
Environmental, Health & Safety
Enclosure:
• Corrective Action Plan Update
• Closure by Excavation Closure Plan

wood.
DUKE ENERGY
ROXBORO STEAM ELECTRIC PLANT
COAL COMBUSION RESIDUALS SURFACE
IMPOUNDMENT CLOSURE PLAN
CLOSURE BY EXCAVATION
EAST ASH BASIN (EAB)
CLOSURE PLAN REPORT
Final Submittal
Prepared for
('DUKE
ENERGY.
550 South Tryon Street
Charlotte, North Carolina 28202
Final Revision 0
Issue Date: December 18, 2019
Prepared by
Wood Environment & Infrastructure Solutions, Inc.
4021 Stirrup Creek Drive, Suite 100
Durham, North Carolina 27703
Project No. 7812190186

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EAB Coal Combustion Residuals Surface Impoundment Closure Plan (Excavation)
TABLE OF CONTENTS
EXECUTIVE SUMMARY............................................................................................................v
1. INTRODUCTION.............................................................................................................1
1.1 Background......................................................................................................................... 1
1.2 Closure Plan Objectives...................................................................................................... 1
1.3 Report Organization............................................................................................................ 2
2. GOVERNING LAWS.......................................................................................................2
3. FACILITY DESCRIPTION AND EXISTING FEATURES DESCRIPTION ........................3
3.1 Surface Impoundment Description...................................................................................... 3
3.1.1
Site History and Operations...................................................................................
3
3.1.2
Estimated Volume of CCR in Impoundment..........................................................4
3.1.3
Description of Surface Impoundment Structural Integrity
......................................5
3.1.4
Sources of Discharges into Surface Impoundments..............................................6
3.1.5
Existing Liner System............................................................................................6
3.1.6
Inspection and Monitoring Summary.....................................................................6
3.2 Site Maps............................................................................................................................
7
3.2.1
Existing CCR Impoundment Related Structures....................................................7
3.2.2
Receptor Survey....................................................................................................
7
3.2.3
Existing On -Site Landfills.......................................................................................7
3.3 Monitoring and Sampling Location Plan............................................................................. 8
4. RESULTS OF HYDROGEOLOGIC, GEOLOGIC, AND GEOTECHNICAL
INVESTIGATIONS..........................................................................................................8
4.1 Background......................................................................................................................... 8
4.2 Hydrologic and Geologic Descriptions................................................................................ 8
4.3 Stratigraphy of the Geologic Units Underlying Surface Impoundments ............................. 8
4.4 Geotechnical Properties...................................................................................................... 8
4.4.1 CCR within Basin................................................................................................... 9
4.4.2 Liner Material Properties........................................................................................9
4.4.3 Subsurface Soil Properties....................................................................................9
4.5 Chemical Analysis of Impoundment Water, CCR, and CCR Affected Soil ......................... 9
4.6 Historical Groundwater Sampling Results.......................................................................... 9
4.7 Groundwater Potentiometric Contour Maps..................................................................... 10
4.8 Estimated Vertical and Horizontal Extent of CCR within the Impoundments ................... 10
5. GROUNDWATER MODELING ANALYSIS...................................................................10
5.1 Site Conceptual Model Predictions................................................................................... 11
5.2 Groundwater Chemistry Effects........................................................................................ 11
5.3 Groundwater Trend Analysis Methods.............................................................................. 11
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6. BENEFICIAL USE AND FUTURE USE........................................................................11
6.1 CCR Use........................................................................................................................... 11
6.2 Site Future Use................................................................................................................. 11
7. CLOSURE DESIGN DOCUMENTS..............................................................................11
7.1 Engineering Evaluations and Analyses............................................................................ 11
7.2 Closure Plan Activities...................................................................................................... 12
7.3 Design Drawings............................................................................................................... 13
7.4 Description of Construction Quality Assurance and Plan ................................................. 14
8. MANAGEMENT OF WASTEWATER AND STORMWATER........................................15
8.1 Anticipated Changes in Wastewater and Stormwater Management ................................ 16
8.2 Wastewater and Stormwater Permitting Requirements.................................................... 16
9. DESCRIPTION OF FINAL DISPOSITION OF CCR......................................................16
10. APPLICABLE PERMITS FOR CLOSURE....................................................................16
11. DESCRIPTION OF POST -CLOSURE MONITORING AND CARE...............................16
11.1 Groundwater Monitoring Program..................................................................................... 17
12. PROJECT MILESTONES AND COST ESTIMATES.....................................................17
12.1 Project Schedule............................................................................................................... 17
12.2 Closure and Post -Closure Cost Estimate......................................................................... 17
13. REFERENCED DOCUMENTS......................................................................................18
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Figures
Figure ES-1 Current Condition View
Figure ES-2 Post -Closure Condition View
Figure 1-1 Vicinity Map and Site Plan
Figure 3-1 Existing Conditions Plan
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Tables
Table 2-1
Table 4-1
Table 10-1
NC CAMA Closure Plan Requirements Summary and Cross Reference
Summary of Typical Geotechnical Index Properties
Regulatory Permits, Approvals, or Requirements for Basin Closure by Excavation
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Appendices
Appendix A Estimated Volume of CCR in Impoundment
Appendix B Geotechnical Data and Properties
Appendix C Engineering Evaluations and Analyses
Appendix C1 Stormwater
Appendix C2 Borrow Soil Quantities
Appendix D Closure Plan Drawings
Appendix E Excavation Soil Sampling Plan
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EAB Coal Combustion Residuals Surface Impoundment Closure Plan (Excavation)
EXECUTIVE SUMMARY
Duke Energy has prepared this Closure Plan to describe the closure of the East Ash Basin (EAB)
at the Roxboro Steam Electric Plant (Roxboro Plant). This plan details the closure -by -excavation
of the EAB and placement of the excavated coal combustion residuals (CCR) in a proposed
expansion to the permitted on -site lined landfill. Closure for the EAB includes the Eastern
Extension Impoundment (EEI) area of the EAB. The excavation of CCR and the closure of the
EAB will be in accordance with applicable provisions of the North Carolina Coal Ash Management
Act of 2014, as amended (CAMA) (codified at N.C.G.S. § 130A-309.200 et seq.), and the federal
Disposal of Coal Combustion Residuals from Electric Utilities rule (CCR Rule) (codified at 40
C. F. R. § 257.50 et seq. ).
The Roxboro Plant is owned and operated by Duke Energy Progress (Duke Energy) and is located
in Person County, approximately 5 miles southeast of Semora, North Carolina. The Roxboro
Plant consists of four coal-fired electric generating units with a combined generating capacity of
2,422 megawatts. The first generating unit (Unit 1) at the Roxboro Plant site went into service in
1966.
Duke Energy has historically operated impoundments at the Roxboro Plant site for storing CCR,
including the EAB, Flue Gas Desulfurization (FGD) Basins, and the West Ash Basin (WAB). It
should be noted that a separate Closure Plan has been prepared for closure of the Roxboro WAB
and the FGD Basins. The EAB was formed by construction of the EAB Main Dam around 1965
(regulated by NCDEQ as PERSO-033), which was subsequently raised in 1973 to the current
maximum height of around 70 feet. The EAB originally released outflow through the eastern
discharge canal to the Hyco Reservoir, which is a part of the Roanoke River Basin. Outflow is
currently released through culverts under Dunnaway Road into the WAB. The existing permitted
industrial landfill (NCDEQ Permit No. 7302) is used primarily for disposal of CCR, is located
partially within the original EAB extent and on top of sluiced CCR. There is also a permitted land
clearing and inert debris (LCID) landfill partially located within the original EAB extent used
primarily for construction and asbestos waste material.
The CCR boundary of the EAB is designated as the area outside the permitted limits for the
existing industrial landfill and LCID landfill. The area enclosed by the CCR boundary of the EAB
is estimated to be approximately 71.3 acres, which includes 12.7 acres for the EEI area of the
EAB. Based on a topographic survey performed in 2014 and other data, the CCR boundary of
the EAB is estimated to contain approximately 3.24 million cubic yards of CCR or approximately
3.89 million tons. This estimate includes CCR within the EEI area of the EAB.
Upon approval of a Closure Plan by NCDEQ, additional actions will commence, including
finalization of detailed designs, dewatering and removal of interstitial water, contracting and
detailed planning for the closure work, stabilization of the existing industrial landfill, development
of the lined landfill expansion in conjunction with excavation of the CCR, final grading of the site
and landfill, and development of storm water features and vegetative covers.
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Figures ES-1 and ES-2 illustrate the current state, and post -closure state of the Basin as detailed
by this Closure Plan.
Figure ES-1 Current View
Figure ES-2 Post Closure View
The Basin CCR will be removed to a new lined landfill expansion within the Station property,
located partially within the prior footprint of a portion of the EAB adjacent to Dunnaway Road. The
landfill would rise approximately 180 feet above Dunnaway Road. Post -excavation, the Basin site
will resemble the land's valley shape before the basin was created. Soil will be graded to restore
contours for stormwater flows, then planted with native grasses for erosion control. The Basin
Dam will remain in place, with storm water flows directed under Dunnaway Road to the WAB
footprint and on to Hyco Lake.
This document also includes a description of the Post -Closure Care Plan, which provides a
description of the inspection, monitoring, and maintenance activities required to be performed
throughout the 30-year post -closure care period for the closed Basins at the Roxboro Plant.
This document provides a summary of properties of the site, as well as geotechnical properties
of CCR and natural soils to support engineering analyses of the closure design. These analyses
indicate that closure by excavation, as detailed in the Closure Plan, meets regulatory
requirements for the stability of the site, management of surface water run-off, and access for
effective maintenance over the post -closure care period.
In accordance with the requirements of N.C.G.S. § 130A-309.21 1 (b)(1), Duke Energy separately
submitted an updated Corrective Action Plan (CAP) in parallel with this Closure Plan; the updated
CAP is herein incorporated in its entirety by this reference. Neither the updated CAP nor its
content is the work product of Wood. Although the Closure Plan contains references to the
updated CAP, all specific relevant details to groundwater and related actions are found in the
updated CAP itself and not in this Closure Plan.
As detailed in the updated CAP, Duke Energy has begun to implement, and will continue
implementing, source control measures at the site, including (i) complete decanting of the East
Ash Basin and West Ash Basin to lower the hydraulic head within the basins and decrease
hydraulic gradients, reducing groundwater seepage velocities and COI transport potential; and (ii)
complete closure of the East Ash Basin and West Ash Basin. In addition, Duke Energy intends to
implement a robust active groundwater remediation program that includes extraction and
treatment at the East Ash Basin, and a combination of groundwater extraction and clean water
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infiltration at the gypsum storage area and dry fly ash handling area. The CAP provides that these
corrective action measures will most effectively achieve remediation of the groundwater through
the installation of (i) extraction wells in the area of the unnamed pond north of the East Ash Basin;
(ii) extraction wells on the northeast side of the East Ash Basin; (iii) extraction wells in the
comingling zone near the dry fly ash handling area; and (iv) extraction wells and clean water
infiltration wells in the area between the gypsum storage area/dry fly ash handling area and Intake
Canal. Significantly, groundwater modeling simulations indicate (i) these measures will address
COI at or beyond the East Ash Basin compliance boundary; and (ii) at such time the site -specific
considerations detailed within the CAP have been satisfied, including, but not limited to, securing
all required state approvals, installing the necessary equipment, and commencing full-scale
system operation, COI at or beyond the East Ash Basin compliance boundary will meet the
remedial objectives in five to nine years. Critically, as discussed above, the model indicates that
COI concentrations currently meet the 02L Standards at and beyond the West Ash Basin
compliance boundary.
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1. INTRODUCTION
1.1 Background
The Roxboro Plant is located in Person County, approximately 5 miles southeast of Semora, North
Carolina and consists of four coal-fired electric generating units with a combined generating
capacity of 2,422 megawatts. The first generating unit (Unit 1) at the Roxboro Plant site went into
service in 1966. CCR has historically been managed at the Roxboro Plant with the on -site West
Ash Basin (WAB), East Ash Basin (EAB) and Flue Gas Desulfurization (FGD) Basins (also
referred to as FGD Ponds). The Roxboro Plant ceased all waste flows to the Basins in 2019. The
CCR boundary of the EAB includes the Eastern Extension Impoundment (EEI) area.
Figure 1-1 presents a Vicinity Map and Site Plan of the Roxboro Plant.
For this Closure Plan, Duke Energy uses a single facility to manage CCR at the Roxboro Plant
that includes a dam regulated by the NCDEQ:
1. East Ash Basin Main Dam (NCDEQ ID: PERSO-033).
As further discussed under Section 2 below, the closure method mandated by order of the NCDEQ
for the EAB is closure by excavation.
1.2 Closure Plan Objectives
The objective of this Closure Plan is to address the closure by excavation of CCR from the Basin
and FGD Ponds as directed by order of NCDEQ. Wood understands Duke Energy does so
without prejudice of its position that closure by excavation is not necessary for either the Basin or
FGD Ponds. Duke Energy also notes that approval from NCDEQ is required to proceed and
develop the additional details as described further within this Closure Plan to complete the
necessary working documents to complete the closure actions. Duke Energy submits this Closure
Plan with the knowledge that other details will follow, as necessary. This Closure Plan describes
and communicates the key actions and activities necessary to close the Basins in accordance
with the requirements for written Closure Plans for CCR surface impoundments presented in
N.C.G.S. §130A-309.214(a)(4). Planned closure activities include:
• Removal and disposal of CCR from the EEI area of the EAB;
• Decanting of the EAB;
• Construction of stabilization and seepage cut-off walls using a deep mixing method (DMM)
or other suitable approach around the perimeter of the existing permitted industrial landfill
where that perimeter borders the CCR boundary of the EAB;
• Construction and operation of a temporary water management system (WMS) to manage
discharges in compliance with NPDES permit during closure;
• Dewatering to support safe excavation of CCR from the Basin;
• Excavation of the CCR and establishing post -excavation final grades using soil fill where
required;
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• Construction of an on -site CCR landfill expansion to permanently store the excavated
CCR;
• Restoration of disturbed areas; and
• Modification or breaching of the EAB Main Dam is not currently required for the EAB
Closure Plan; however, dam decommissioning is expected with EAB Closure Plan after
completion of CCR excavation and placement of soil fill.
1.3 Report Organization
This document is structured to follow the requirements provided in N.C.G.S. §130A-
309.214(a)(4).
2. GOVERNING LAWS
In August 2014, the North Carolina General Assembly enacted CAMA, which contains specific
statutory requirements applicable to the CCR Basin. Subsequently, in July 2016, the North
Carolina General Assembly enacted House Bill 630, Session Law 2016-95, which provides that
impoundments be classified as "low -risk" if, by certain deadlines, the owner has established
permanent alternative water supplies, as required, and has rectified any deficiencies identified by,
and has otherwise complied with requirements of, any dam safety order. NCDEQ determined
that Duke Energy met these criteria on November 14, 2018, and officially classified the EAB as
"low -risk."
On April 1, 2019, NCDEQ issued its Closure Determination mandating that the Ash Basin be
closed by excavation of the CCR pursuant to N.C.G.S. § 130A-309.214(a)(3)a. A closure plan is
required for each CCR surface impoundment regardless of the risk classification. CAMA's closure
plan requirements and cross-referenced sections of this Closure Plan are summarized in Table
2-1. On April 26, 2019, Duke Energy filed a Petition for Contested Case Hearing before the North
Carolina Office of Administrative Hearings appealing this determination, and on May 24, 2019
Duke Energy filed amended petitions in the case. The petitions allege that in issuing its Closure
Determination, NCDEQ failed to (i) follow the mandatory process and procedure outlined in CAMA
and (ii) consider or apply the scientific and engineering evidence submitted and available to it in
reaching its decision to require the most expensive closure method available despite scientific
and engineering evidence demonstrating the availability of less expensive and more rapid closure
options that would continue to fully protect human health and the environment. Certain decisions
by the administrative law judge in that case are currently under appeal to the North Carolina
Superior Court.
In addition to the closure plan requirements, CAMA sets out groundwater assessment and
corrective action requirements. A Comprehensive Site Assessment report was submitted to
NCDEQ in September 2015, with supplemental reports submitted August 2016 and October 2017.
The Corrective Action Plan (CAP) Part 1 was submitted December 2015 and the CAP Part 2 was
submitted February 2016. Duke Energy intends that an updated CAP will be submitted in parallel
with this Closure Plan.
In addition to the above requirements, National Pollutant Discharge Elimination System (NPDES)
permit program compliance, SOC (which commits Duke Energy to initiate and complete decanting
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of the Basin by dates certain) compliance, dam safety approvals for modifications to regulated
CCR basin dams, and environmental permitting requirements must be considered as part of
closure.
3. FACILITY DESCRIPTION AND EXISTING FEATURES DESCRIPTION
3.1 Surface Impoundment Description
This section provides details on the CCR-related features at the Roxboro Plant.
3.1.1 Site History and Operations
Figure 1-1 presents a Vicinity Map and Site Plan for the Roxboro Plant and Figure 3-1 presents
an Existing Conditions Plan for the EAB and other site features.
For this Closure Plan, CCR facilities located on -site include the EAB and additional facilities as
described in more detail below:
East Ash Basin (EAB Main Dam NCDEQ ID: PERSO-033)
The EAB is situated southeast of the Roxboro Plant generating units. For this Closure Plan, the
closure area for the EAB located is designated as the area outside the limits of the permitted
industrial and LCID landfills. The CCR boundary of the EAB is estimated to be around 71.3 acres,
which includes 12.7 acres for the EEI area of the EAB.
The EAB Main Dam was constructed between 1964 and 1965, with an earth -fill embankment
having a maximum height of approximately 50 feet. In 1973, the dam was raised 20 feet to its
present configuration by placement of rock fill over a filter blanket on the original downstream
slope. The EAB Main Dam is approximately 1,330 feet in length, design crest width of 15 feet,
and crest level at Elevation 470 feet. The EAB became inactive following construction of the WAB
around 1986.
The original eastern discharge canal is located on the northwest side of the EAB and releases
flow from the EEI area of the EAB into the Intake Canal. Surface water runoff from within the
CCR boundary of the EAB (excluding the EEI area of the EAB) flows through culverts under
Dunnaway Road and into the WAB.
The EAB historically accepted bottom ash and fly ash generated from operation of the Roxboro
Plant conveyed via wet sluicing methods, along with various other waste water streams. The EAB
has received fly ash, bottom ash, CCR transport water, coal pile runoff, stormwater runoff, cooling
tower blowdown, and low volume wastewater.
The Roxboro Plant converted from wet to dry ash handling system. During 2019, modifications
were completed to re -direct plant stormwater, waste water and process flows; therefore, these
flows to the EAB have ceased.
Additional Facilities
Other CCR facilities within the EAB area are shown in the attached Figure 3-1 and are described
in more detail below.
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During 1988, the conversion of the plant to dry fly ash handling was completed and placement of
dry fly ash started within a permitted unlined industrial landfill area (NCDEQ Permit 7302-INDUS-
1988) located within the EAB. Development of the unlined industrial landfill area included
construction of a "separator berm" feature located at the eastern limit of the landfill area, adjacent
to the EEI area of the EAB.
In 2001, a plan for a lined industrial landfill area was developed for the EAB site. In preparation
for the proposed lined landfill development, dry fly ash was placed and compacted to achieve
desired subgrade elevations within the planned layout area for the lined landfill (also described
as "engineered subgrade fill"). The Permit to Construct (PTC) for the lined industrial landfill was
issued on June 22, 2002. The existing lined industrial landfill (permitted under NCDEQ Permit
7302-INDUS-1988) is constructed partially on CCR deposits within the EAB and is actively used
for disposal of CCR at the Roxboro Plant. Phase 6 of the industrial landfill was permitted pursuant
to the authority of N.C.G.S. § 130A-295.4 (combustion products landfills constructed partially or
entirely within areas formerly used for the storage or disposal of CCR) and in accordance with
North Carolina's rules governing the siting, design, and construction of sanitary landfills, and
includes a double -liner system with a leak detection system between the liners. It is Duke
Energy's position that at such time the areas of the former Basin underlying the existing industrial
landfill were permitted under NCDEQ Permit No. 7302, they became an intrinsic part of the
landfill's base and ceased being "surface impoundment" under North Carolina law. Accordingly,
closure of the permitted EAB industrial landfill is not subject to CAMA's CCR surface impoundment
closure requirements and, thus, is not addressed under this Closure Plan. Instead, closure of the
permitted industrial landfill will be conducted pursuant to a separate regulatory process in
accordance with 15A N.C.A.C. 13B § .0500.
There is also an active permitted land clearing and inert debris (LCID) landfill (NCDEQ Permit
73D-LCID-2002) partially located within the original EAB extent used primarily for disposal of
construction and asbestos waste material. Based on the statements above, closure of the
permitted LCID landfill is not subject to CAMA's CCR surface impoundment closure requirements
and, thus, is not addressed under this Closure Plan.
3.1.2 Estimated Volume of CCR in Impoundment
Based on CCR inventory data provided by Duke Energy as of July 31, 2019, and upon surface
comparison calculations, comparing the approximate pre -development topography to the existing
topographic survey, the approximate volume of CCR within the CCR boundary of the EAB is listed
in the table below.
During 2016, field investigations were performed for the purpose of estimating the extent of CCR
material present within the EEI area of the EAB. The estimated volume of CCR for the EEI area
of the EAB is included in estimate provided below.
To compute the estimated volume of CCR in place an assumed density of 1.2 tons per cubic yard
was used, which is the Duke Energy fleet -wide assumption. See Appendix A for the Estimated
Volume of CCR in Impoundment calculation.
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Impoundment
Description
Estimated CCR Volume (CY)
Estimated CCR Weight
(Tons)
East Ash Basin (EAB)
3,142,000
3,770,400
EEI Area of the EAB
97,917
117,500
Totals
3,239,917
3,887,900
3.1.3 Description of Surface Impoundment Structural Integrity
The purpose of this section is to summarize the structural integrity evaluations for the EAB based
on current existing information. This section includes the geotechnical, and hydrology and
hydraulics capacity analyses results. In summary, the structural integrity of the Basin and
subsequent dam inspection reports meets the regulatory requirements of EPA's CCR Rule (40
CFR 257.3). Duke Energy's certifications of these requirements are available on Duke Energy's
publicly accessible CCR Rule Compliance Data and Information website.
• Slope stability
For the EAB Main Dam embankment, slope stability analysis results for the existing conditions
global factors of safety for static long-term maximum storage pool, static maximum surcharge
pool, sudden drawdown conditions, and pseudo -static seismic conditions meet regulatory criteria.
Slope stability results under the loading conditions mentioned above meet regulatory
requirements.
During 2018, AECOM performed a seismic stability evaluation for the EAB separator berm, which
separates the EAB and the permitted industrial landfill from the adjacent EEI area of the EAB
(AECOM, 2018). Based on the results of the seismic stability evaluation performed by AECOM,
the separator berm meets the static and seismic factor of safety requirements for closure options
evaluated.
• Liquefaction conditions (where susceptible) and Liquefaction potential
A liquefaction screening analysis was performed for the EAB Main Dam. The liquefaction analysis
(based on the far field condition) shows factor of safety marginally less than 1.1 of materials
(mostly soft sandy silt) within the dam itself at a depth of approximately 20 feet below the existing
ground surface in Boring B-6. Note that in cases where testing data are not available, different
assumed values of fine percentage would not affect the conclusion of the analysis. This SPT
sample lies near the boundary of the "random fill" and "selected large rock" embankment fill
zones. Considering that such localized potentially liquefiable soils exists within one sample
interval at a deeper depth and no other boring encountered such a soft zone within the dam
embankment, liquefaction is not considered a hazard at this location (Boring B-6).
• Hydrology and Hydraulics (H&H) Capacity Analyses
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H&H analyses were performed to evaluate whether the EAB and discharge outlet (culverts under
Dunnaway Road) could safely pass a design storm for the full Probably Maximum Precipitation
(PMP) storm event without overtopping the dam. This analysis was based on a design flood for
a site specific PMP storm event as developed by Applied Weather Associates (AWA). The results
for the additional H&H analyses indicate that the EAB can contain and safely pass the full site
specific PMP with 4.75 feet of freeboard (peak elevation 471.5).
3.1.4 Sources of Discharges into Surface Impoundments
Process flows no longer discharge into the EAB. The Roxboro Plant currently employs a dry
handling system transporting CCR to the on -site landfill.
Stormwater flows from the EAB into the WAB through existing culverts located under Dunnaway
Road.
3.1.5 Existing Liner System
The EAB does not include a geomembrane or clay liner system and is considered to be unlined.
The EAB was constructed directly on top of the historical ground surface.
3.1.6 Inspection and Monitoring Summary
Weekly inspections of the Basin have been on -going since 2014, and include observation of
upstream slopes and shorelines, crest, downstream slopes, toes, abutment contacts and adjacent
drainage way(s), spillway(s) and associated structure(s), and other structures and features of the
dams.
Monthly inspections of the Basin include the weekly monitoring elements with the addition of
piezometer and observation well readings, water level gauges/sensors.
Daily inspections of the Basin are not routinely required, however, on a case -by -case basis, the
Basin may be inspected daily beginning at such times and continued for the duration as specified
by plant management. Such daily inspections might be initiated during a repair activity on the dam
or in response to a specific imposed regulatory agency requirement.
The Basin is inspected annually by an independent third -party consultant. In a letter dated August
13, 2014, NCDEQ requires these inspections to be conducted annually at all of Duke Energy's
CCR impoundments in North Carolina. These inspections are intended to confirm adequacy of
the design, operation, and maintenance of the surface impoundments in accordance with
accepted engineering standards. Reports are to be submitted to the NCDEQ within 30 days of
the completion of the inspection. Historically, independent inspections of the EAB Main Dam have
performed by an independent third -part consultant on a 5-year and annual basis between 1998
and 2013.
The results of the annual inspections are used to identify needed repairs, repair schedules, to
assess the safety and operational adequacy of the dam, and to assess compliance activities
regarding applicable permits, environmental and dam regulations. Annual inspections are also
performed to evaluate previous repairs.
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Review of current annual inspection reports did not identify features or conditions in the ash basin
dams, or their outlet structures or spillways that indicate an imminent threat of impending failure
hazard. Review of critical analyses indicated the design conforms to current engineering state of
practice to a degree that no immediate actions are required other than the recent and ongoing
surveillance and monitoring activities already underway.
Special, episodic inspections of the Basin may be performed during episodes of earthquake,
emergency, or other extraordinary events. Visual inspections are performed after a heavy
precipitation event when accumulation of four inches of rainfall or greater occurs within a 24-hour
period. An internal inspection will be performed if an earthquake is felt locally or detected by the
US Geological Survey measuring greater than a Magnitude 3 and with an epicenter within 50
miles of the dams. A special inspection would also be performed during an emergency, such as
when a potential dam breach condition might be identified or when construction activities (e.g.,
basin cleanout) are planned on or near the dams. Special inspections are also conducted when
the ongoing surveillance program identifies a condition or a trend that warrants special evaluation.
3.2 Site Maps
3.2.1 Existing CCR Impoundment Related Structures
A site map showing property boundary, location of the Roxboro Plant, features with their
boundaries and topographic and bathymetric contours are shown on Figure 3-1.
3.2.2 Receptor Survey
This information is included as part of the CAP being prepared separately by SynTerra for Duke
Energy and is being submitted in parallel to this Closure Plan. The CAP is herein incorporated
by this reference, but its content is not the work product of Wood.
3.2.3 Existing On -Site Landfills
There are currently three existing permitted landfills on site, which are identified in the table below,
along with the status (active/closed). The existing landfills are shown on the attached Figure 3-
1 and described in more detail in Section 3.1.1. The CCR contained within the landfill is not
subject to this Closure Plan.
Landfill
Permit Number
Comment
On -site Industrial Landfill
7302-INDUS-1988
Active
LCID Landfill
73D-LCID-2002
Non-CCR, Active
1979 Landfill
73-A
Non-CCR, Inactive
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3.3 Monitoring and Sampling Location Plan
This information is included as part of the CAP being prepared separately by SynTerra for Duke
Energy and is being submitted in parallel to this Closure Plan. The CAP is herein incorporated by
this reference, but its content is not the work product of Wood.
4. RESULTS OF HYDROGEOLOGIC, GEOLOGIC, AND GEOTECHNICAL
INVESTIGATIONS
4.1 Background
An overall boring and existing monitoring well location plan indicating the locations of recent and
historical borings, monitoring wells, piezometers and Cone Penetration Test (CPT) sounding
locations is shown on the drawings included in Appendix D. In addition, the available boring logs
and records for subsurface exploration are included in the Wood, Geotechnical Data Report —
Final Rev. 0, Roxboro Steam Station — East Ash Basin, July 1, 2019, which is included in
Appendix B.
This section summarizes the site geology and hydrogeology; site stratigraphy of the geologic units
underlying the surface impoundments; hydraulic conductivity of CCR and the soils underlying the
surface impoundment; and geotechnical properties of the CCR and the uppermost stratigraphic
unit under the surface impoundment.
4.2 Hydrologic and Geologic Descriptions
This information is included as part of the CAP being prepared separately by SynTerra for Duke
Energy and is being submitted in parallel to this Closure Plan. The CAP is herein incorporated by
this reference, but its content is not the work product of Wood.
4.3 Stratigraphy of the Geologic Units Underlying Surface Impoundments
This information is included as part of the CAP being prepared separately by SynTerra for Duke
Energy and is being submitted in parallel to this Closure Plan. The CAP is herein incorporated by
this reference, but its content is not the work product of Wood.
4.4 Geotechnical Properties
This section provides a summary of geotechnical conditions and properties found from
investigations performed within the EAB and EAB Main Dam areas. The presented information
was obtained from previous geotechnical investigations at the site and recent investigation
activities conducted to support the Closure Plan development. The geotechnical conditions within
the Basin generally consist of CCR (interbedded layers of fly ash and bottom ash) placed in the
basin primarily by hydraulic sluicing underlain by residual soil, saprolite, partially weathered rock
(PWR), and bedrock.
General properties of the various materials encountered within and surrounding the EAB are
described below. The results of available laboratory tests performed on samples from the
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subsurface explorations completed within and surrounding the EAB were reviewed, and the range
of representative material properties is summarized in Table 4-1.
4.4.1 CCR within Basin
The CCR within the EAB consists primarily of bottom ash and fly ash. Other CCR such as slag
are also typically encountered. The bottom ash is generally described as very loose to loose,
moist to wet, dark gray to gray material, and typically classified as silty sand (SM). The fly ash is
generally described as very soft to soft, moist to wet, light to medium gray material, and typically
classified as sandy silt and silt (ML).
4.4.2 Liner Material Properties
The EAB is unlined so there are no associated material properties.
4.4.3 Subsurface Soil Properties
Alluvium: Alluvial soil is typically encountered beneath the sluiced CCR. The alluvium generally
consists of very loose to loose, wet, silty fine sand (SM) or soft to firm, wet, fine sandy silt
(ML). The soil colors encountered ranged from gray to dark gray, green, brown and
black. Alluvium may not be encountered in excavated areas.
Residuum: The residuum (including saprolite) is the next layer encountered and generally was
found to consist of soft to hard sandy lean clays (CL) and sandy silts (ML), or loose to dense silty
sands (SM) and clayey sands (SC). The soil colors encountered ranged from gray to dark gray,
green, brown and black. The saprolite layers typically were sampled as sandy silt (ML) or silty
sand (SM).
PWR: Partially Weathered Rock (PWR) is typically encountered below the residuum for the Basin.
PWR primarily consists of wet, light gray to reddish brown to light brown mottled sand (SP), silty
sand (SM), sandy non -plastic silt (ML), sand with clay (SP-SC), lean clay (CL), and weathered
meta -quartz diorite, meta-granodiorite, and meta-diabase bedrock.
Bedrock: Bedrock is typically encountered below the PWR for the Basin. The bedrock primarily
consists of dark greenish gray, very strong, coarse grained, massive Meta -Quartz diorite, and
black and white, strong, fine to coarse grained Meta-Diabase bedrock.
4.5 Chemical Analysis of Impoundment Water, CCR, and CCR Affected Soil
This information is included as part of the CAP being prepared separately by SynTerra for Duke
Energy and is being submitted in parallel to this Closure Plan. The CAP is herein incorporated by
this reference, but its content is not the work product of Wood.
4.6 Historical Groundwater Sampling Results
This information is included as part of the CAP being prepared separately by SynTerra for Duke
Energy and is being submitted in parallel to this Closure Plan. The CAP is herein incorporated
by this reference, but its content is not the work product of Wood.
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4.7 Groundwater Potentiometric Contour Maps
This information is included as part of the CAP being prepared separately by SynTerra for Duke
Energy and is being submitted in parallel to this Closure Plan. The CAP is herein incorporated by
this reference, but its content is not the work product of Wood.
4.8 Estimated Vertical and Horizontal Extent of CCR within the Impoundments
This information is included as part of the CAP being prepared separately by SynTerra for Duke
Energy and is being submitted in parallel to this Closure Plan. The CAP is herein incorporated by
this reference, but its content is not the work product of Wood.
5. GROUNDWATER MODELING ANALYSIS
In accordance with the requirements of N.C.G.S. § 130A-309.211(b)(1), Duke Energy separately
submitted an updated Corrective Action Plan (CAP) in parallel with this Closure Plan; the updated
CAP is herein incorporated in its entirety by this reference. Neither the updated CAP nor its
content is the work product of Wood. Although the Closure Plan contains references to the
updated CAP, all specific relevant details to groundwater and related actions are found in the
updated CAP itself and not in this Closure Plan.
The updated CAP evaluates the extent of, and remedies for, constituents of interest (COI) in
groundwater associated with the East Ash Basin and gypsum storage area, focusing on
constituent concentrations detected above the applicable 02L Standards, Interim Maximum
Allowable Concentrations, or approved background threshold values beyond the basin's
compliance boundary. Importantly, constituent concentrations in groundwater associated with the
West Ash Basin are less than applicable regulatory standards at and beyond the compliance
boundary. Accordingly, groundwater corrective action under North Carolina's 02L standards is not
required for this basin. In addition to the state's corrective action requirements, the updated CAP
considers the federal groundwater corrective action requirements at 40 C.F.R. §§ 257.96-.98.
As detailed in the updated CAP, Duke Energy has begun to implement, and will continue
implementing, source control measures at the site, including (i) complete decanting of the East
Ash Basin and West Ash Basin to lower the hydraulic head within the basins and decrease
hydraulic gradients, reducing groundwater seepage velocities and COI transport potential; and (ii)
complete closure of the East Ash Basin and West Ash Basin. In addition, Duke Energy intends to
implement a robust active groundwater remediation program that includes extraction and
treatment at the East Ash Basin, and a combination of groundwater extraction and clean water
infiltration at the gypsum storage area and dry fly ash handling area. The CAP provides that these
corrective action measures will most effectively achieve remediation of the groundwater through
the installation of (i) extraction wells in the area of the unnamed pond north of the East Ash Basin;
(ii) extraction wells on the northeast side of the East Ash Basin; (iii) extraction wells in the
comingling zone near the dry fly ash handling area; and (iv) extraction wells and clean water
infiltration wells in the area between the gypsum storage area/dry fly ash handling area and Intake
Canal. Significantly, groundwater modeling simulations indicate (i) these measures will address
COI at or beyond the East Ash Basin compliance boundary; and (ii) at such time the site -specific
considerations detailed within the CAP have been satisfied, including, but not limited to, securing
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all required state approvals, installing the necessary equipment, and commencing full-scale
system operation, COI at or beyond the East Ash Basin compliance boundary will meet the
remedial objectives in five to nine years. Critically, as discussed above, the model indicates that
COI concentrations currently meet the 02L Standards at and beyond the West Ash Basin
compliance boundary..
5.1 Site Conceptual Model Predictions
This information is included as part of the CAP being prepared separately by SynTerra for Duke
Energy and is being submitted in parallel to this Closure Plan. The CAP is herein incorporated by
this reference, but its content is not the work product of Wood.
5.2 Groundwater Chemistry Effects
This information is included as part of the CAP being prepared separately by SynTerra for Duke
Energy and is being submitted in parallel to this Closure Plan. The CAP is herein incorporated by
this reference, but its content is not the work product of Wood.
5.3 Groundwater Trend Analysis Methods
This information is included as part of the CAP being prepared separately by SynTerra for Duke
Energy and is being submitted in parallel to this Closure Plan. The CAP is herein incorporated by
this reference, but its content is not the work product of Wood.
6. BENEFICIAL USE AND FUTURE USE
6.1 CCR Use
At this time, Duke Energy has not identified a beneficial use of CCR from the EAB at Roxboro
Plant.
6.2 Site Future Use
At this time, Duke Energy has not identified any future use of the land reclaimed by excavation of
the EAB except for a portion that will be developed into the new landfill expansion for closure.
7. CLOSURE DESIGN DOCUMENTS
7.1 Engineering Evaluations and Analyses
Engineering evaluations and analyses to support closure of the EAB at the Roxboro Plant, as
detailed in this Closure Plan, are provided in Appendix C.
Geotechnical calculations for the proposed landfill expansion design will be performed separately
as part of its permit application, which will follow NCDEQ approval of this Closure Plan. Dam
modification -related calculations will be included in the dam modification permit applications,
which will follow NCDEQ approval of this Closure Plan. It should be noted that removal or
modification of the EAB Main Dam is not currently required as part of this Closure Plan.
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Safe and effective access to the EAB is critical to CCR excavation and the completion of closure.
Access road locations into or across the Basin cannot be reliably established until detailed
phasing of closure is developed, and a contractor is selected to complete the work. A variety of
mitigation techniques are can be applied, such as installation of a geogrid and crushed stone
aggregate, placement and spreading of dry CCR over the Basin surface to establish access and
use of low ground pressure or light weight construction equipment.
For closure by excavation of the EAB, all CCR subject to closure under CAMA (i.e., all CCR not
within the footprint of the industrial landfill or LCID landfill) will be removed. To accomplish this, a
slope stabilization system will be constructed using methods that may include, but are not limited
to, the deep mixing method (DMM). The slope stabilization system is proposed to be constructed
at the permitted limits of the northern and western perimeters of the industrial landfill footprint,
and along the separator berm adjacent to the EEI area of the EAB. The closure plan drawings
indicate approximate locations and reasonable dimensions for the slope stabilization system.
Design of the slope stabilization system will be conducted following NCDEQ approval of this
Closure Plan.
Areas for stockpiling or conditioning of CCR are generally needed. These areas will be
established within the closure limits of the Basin and require placement or stacking of CCR
excavated from other areas of the EAB. They can be established in areas where all or most of
the CCR has been removed, or on areas where a significant depth of CCR remains in place.
Sluiced CCR forming the foundation of stockpiles or conditioning areas may be subject to bearing
capacity or slope failures from the additional vertical compressive stress imparted by the stacked
CCR and hauling equipment.
During excavation of CCR, interim or temporary excavated CCR slopes are commonly created.
These slopes vary in height and the duration they will have to stand. Some slopes are subject to
potential loading from hauling or stockpiling operations. The location and geometry of such slopes
cannot be established during design. These elements depend on the means and methods
employed by the construction contractor, site conditions, schedule and other site conditions.
Excavation in a deep valley fill creates safety risks that need further evaluation and will require
the means and methods inputs from a contractor to fully address before closure excavation work
commences. A detailed phasing and excavation plan will be developed after this Closure Plan is
approved by NCDEQ. However, the proposed excavation and sampling plan for closure by
excavation areas is included in Appendix E .
7.2 Closure Plan Activities
The primary activities associated with closure by excavation are as follows:
• Construct the proposed stabilization and seepage cut-off walls using a deep mixing
method (DMM) or other suitable approach around the perimeter of the existing permitted
industrial landfill where that perimeter borders the CCR boundary of the EAB.
• Remove and dispose of CCR from within the EEI area of the EAB.
• Reduce free/surface water volume (if necessary) via discharge through the existing
discharge outlet (culverts under Dunnaway Road) into the WAB under the existing NPDES
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permit. It should be noted that removal free/standing water is not expected to be required
for the EAB Closure Plan.
• Decant by using floating pumps, screened intakes, and pumping.
• Construction and operation temporary WMS to manage all discharges in compliance with
the NPDES permit during closure.
• Dewater the CCR to allow access for CCR excavation and conditioning (drying) prior to
placement in the proposed on -site landfill.
• Start CCR excavation from the Basin, with sequencing determined for optimal
progression. Manage and control of dust -generating activities through specific site
planning and mitigation. Construct landfill expansion cells in coordination with CCR
excavation. Place the excavated CCR in the on -site landfill area and compact.
Instrumentation and monitoring requirements to be developed prior to construction will be
followed to verify construction phase stability. Construction dewatering to be used as
needed to provide stable work areas and slopes.
• Maintain required hydraulic storage capacity through the excavation process.
• Complete closure by excavation verification. Grade the area to promote positive
drainage.
• Establish vegetative stabilization on disturbed areas.
• Construct proposed stormwater detention basins and inflow design flood management
features. Modification or breaching of the EAB Main Dam is not currently required for the
EAB Closure Plan; however, dam decommissioning is expected with EAB Closure Plan
after completion of CCR excavation and placement of soil fill.
Additional information and details pertaining to the closure design are provided in the Closure
Plan drawings, which can be found in Appendix D.
7.3 Design Drawings
The Closure Plan drawings found in Appendix D include the following:
• Cover sheet
• General notes
• Existing conditions plan with aerial photograph
• Existing conditions plan with topography
• Subsurface exploration location plan
• Estimated bottom of CCR plan
• Demolition plan
• Final grading plan
• Final surface water management plan
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• Conceptual DMM wall plan
• Site cross sections
• Schematic landfill expansion plan
• Schematic landfill expansion cross-section
These Closure Plan drawings will be further developed and refined to develop construction level
drawings during subsequent stages following NCDEQ approval of the Closure Plan. In addition,
supplemental drawing sets will be prepared on an as needed basis to support dam modification
and/or decommissioning permits, erosion and sediment control permits, NPDES permit
modifications, and other related permits.
Once the excavation grades shown on the Closure Plan drawings have been achieved, the
procedures described in the Duke Energy Excavation Soil Sampling Plan (Appendix E) will be
followed to confirm that closure by excavation has been achieved.
7.4 Description of Construction Quality Assurance and Plan
A Construction Quality Assurance (CQA) Plan will be developed following NCDEQ approval of the
Closure Plan for closure of the EAB. The CQA Plan will be prepared to address N.C.G.S. §130A-
309.214(a)(4)(g), and its purpose is to provide a description of the CQA program to be adhered
to in execution of closure activities. The CQA Plan will present a description of the roles and
responsibilities for monitoring and testing activities and provides guidance on the methodology to
be used for evaluating whether the construction has been performed in accordance with the
approved Closure Plan. The CQA Plan will also detail the material testing frequencies; methods
for transportation, handling, and storage of materials; test methods and verifications;
manufacturer, field, and laboratory testing; field activities for construction monitoring and
oversight; and reporting and documentation requirements. Technical specifications to be
developed as part of the construction level design packages for contractor bidding and will present
specific material properties and specifications.
The CQA Plan will address materials and CQA activities associated with the following
components:
• Earthwork
o CCR Excavation
o Soil Fill
• HDPE Piping
• Vegetation
• DMM Stabilization System
• As -Built Conditions
• Record Documentation Report
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8. MANAGEMENT OF WASTEWATER AND STORMWATER
The Roxboro Plant manages wastewater under NPDES Permit NC0003425. The permit
authorizes two discharge points into the Hyco Reservoir.
The Roxboro Plant manages stormwater under NPDES Permit NCS000581. The facility is
permitted to discharge stormwater to the Hyco Reservoir.
Process flows no longer discharge into the EAB at the Roxboro Plant. Process flows are directed
toward newly -constructed lined retention basins. The EAB will continue to operate during closure
to meet the NPDES permit discharge requirements as it goes through decanting and dewatering.
The EAB must also continue to safely pass the PMP to meet dam safety requirements.
There are currently no areas of free/standing water that will required drawing down for excavation
of the EAB closure area. During closure, a pumping system is expected to draw down the stored
water after storm events, route it through the WMS, if necessary, and discharge the water into the
permitted outfall. When dewatering of the CCR begins, all discharge flows are anticipated to be
routed through the WMS and meet the permitted discharge limits.
As discussed under Section 3.1.3, the results for H&H analyses showed that the EAB Main Dam
can contain and safely pass the full site specific PMP storm event with 4.75 feet of freeboard.
Dewatering will be performed to remove the interstitial water from the CCR to facilitate excavation,
to access in -place CCR and to establish safe slopes prior to and after CCR excavation. It is
anticipated that performance criteria will be established in the construction -level documentation
to identify required vertical and horizontal limits of interstitial water removal at critical locations
and for critical conditions during closure.
Wastewater from the EAB will be pumped, treated as needed and discharged in two phases: the
decanting phase and dewatering phase. In the decanting phase, free water above the settled
CCR layer will be removed from the Basin without the mechanical disturbance of the CCR. For
the decanting phase, the Roxboro WMS has a designed flow rate of 1250 gpm. Following the
decanting phase and as the Closure Plan schedule dictates, the EAB site will advance into the
dewatering phase to remove interstitial water from the Basin. During this phase, additional
physical -chemical treatment processes may be added to the WMS as necessary to maintain
compliance with the requirements of the discharge permit. During the dewatering phase, the
Roxboro designed flow rate may drop to 250-400 gpm.
The post -closure grades will continue to direct flow toward the existing EAB outfall under
Dunnaway Road and then into the WAB. Post -closure stormwater discharge from the EAB will
no longer be in contact with CCR and therefore will not require treatment before being released.
Detention basin requirements and design criteria will be further refined for the construction -level
documents based on actual field elevations reached in the excavated areas and discussions with
NCDEQ, which will follow NCDEQ approval of this Closure Plan. Appendix C1 presents the
results of the post -closure stormwater management calculations. Detailed stormwater design for
the proposed landfill expansion will be developed as part of its permit process and is not covered
herein.
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8.1 Anticipated Changes in Wastewater and Stormwater Management
Wastewater and process streams from the Roxboro Plant previously discharging to the EAB have
been rerouted to a new lined retention basin.
A temporary WMS will be utilized such that the permitted NPDES effluent discharge limits will be
met throughout the duration of dewatering and closure.
Erosion and Sediment Control Plans for different phases of the construction will be developed as
part of the construction -level packages and formal erosion and sediment control plan permit
submittal. In addition, erosion and sediment control measures may be installed and removed in
phases as stabilization is achieved.
8.2 Wastewater and Stormwater Permitting Requirements
Additional information on required permits is described in Section 10.
9. DESCRIPTION OF FINAL DISPOSITION OF CCR
CCR will be dispositioned by placement into an approved and permitted, lined on -site CCR landfill
expansion. Duke Energy intends to laterally expand the existing on -site industrial landfill (NCDEQ
Permit 7302-INDUS-1988) to accommodate CCR in completion of the NCDEQ-mandated closure
by excavation. A permit application for construction of the on -site landfill expansion will be
prepared and submitted to NCDEQ Division of Waste Management following approval of this
Closure Plan.
Vegetation encountered or removed during the progression of the work will be managed in
accordance with state regulations for handling and disposal.
10. APPLICABLE PERMITS FOR CLOSURE
Refer to Table 10-1 for detailed information on the potential and applicable permitting/approval
needed to implement this Closure Plan. Development of permitting package submittals and/or
regulatory approval requests would follow NCDEQ approval of the Closure Plan.
11. DESCRIPTION OF POST -CLOSURE MONITORING AND CARE
A post -closure plan will be developed following NCDEQ approval of the Closure Plan for closure
of the EAB. The purpose of the post -closure plan will be to provide a description of the inspection,
monitoring, and maintenance activities required to be performed throughout the 30-year post -
closure care period for the closed EAB.
The post -closure care plan will be developed to meet the requirements of N.C.G.S. §130A-
309.214(a)(4)(k). The items that will be in the Post -Closure Care plan for the Roxboro site include:
• Name, address, phone number, and email address of the responsible office or person;
• Means and methods of managing affected groundwater and stormwater;
• Maintenance of the groundwater monitoring systems;
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• Regular inspection and maintenance of the final cover system;
• Groundwater and surface water monitoring and assessment program (included as part of
the CAP);
• Post -closure inspection checklist to guide post -closure inspections;
• Description of planned post -closure uses; and
• Financial assurance estimates for post -closure operations and maintenance and remedial
action.
11.1 Groundwater Monitoring Program
This information is included as part of the CAP being prepared separately by SynTerra for Duke
Energy and is being submitted in parallel to this Closure Plan. The CAP is herein incorporated by
this reference, but its content is not the work product of Wood.
12. PROJECT MILESTONES AND COST ESTIMATES
12.1 Project Schedule
A Closure project high level milestone schedule has been prepared by Duke Energy and is
provided below. The schedule defines the following anticipated activities and milestones:
Engineering, decanting, dewatering Ongoing
Submit plan and design for landfill expansion construction permit Q4-2020
Start new landfill expansion construction Q4-2021
Start CCR excavation Q1-2023
Complete CCR excavation Q4-2035
Complete final closure and cover system of landfill Q4-2036
Site final grading and vegetative cover Q4-2037
It should be noted that NCDEQ approval of this Closure Plan by March 31, 2020 will allow
completion of the CCR excavation actions by the CAMA 2029 deadline at N.C.G.S. $ 130A-
309.214(a)(3). A detailed construction schedule will be developed following NCDEQ approval of
this Closure Plan.
12.2 Closure and Post -Closure Cost Estimate
Cost estimates for closure and post -closure of the Basin at Roxboro Plant was developed by Duke
Energy and provided to Wood. These cost estimates are not a work product of Wood. These are
Class 5 estimates as the detailed and final design is not developed at this stage of the closure
project. Following approval of this Closure Plan by NCDEQ and further development of the project
plans and engineering designs the cost estimate will be refined and updated.
The cost to complete the closure by excavation, including the new CCR landfill, is estimated to
be $200 Million.
The cost to perform the 30-year post -closure activities and monitoring is estimated as $95 Million.
The cost estimates include the following major activities:
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Wood Environment & Infrastructure Solutions, Inc.
Duke Energy —Roxboro Plant wood.
EAB Coal Combustion Residuals Surface Impoundment Closure Plan (Excavation)
• Mobilization and Site Preparation
• Dewatering, earthwork, and subgrade preparation
• CCR excavation
• Stormwater management, erosion and sediment control, and site restoration
• Engineering support (design and CQA)
• Post closure — groundwater monitoring
• Post closure — operations and maintenance
• Contingency
Corrective action costs are included as part of the CAP being prepared separately by SynTerra
for Duke Energy and is being submitted in parallel to this Closure Plan. The CAP is herein
incorporated by this reference, but its content is not the work product of Wood.
13. REFERENCED DOCUMENTS
(AECOM, 2018). AECOM, Seismic Stability Evaluation, East Ash Basin Separator Berm and
Eastern Extension Impoundment Closure and Phase 6 Vertical Expansion, November 12,
2018.
(Amec, 2013). Amec, 2013 Five-year Independent Consultant Dam Inspection, Duke Energy
Progress — Roxboro Electric Plant, Person County, North Carolina, October 23, 2013.
(Amec 2016). Amec Foster Wheeler, Report of Ash Extent Exploration (Issue ROX-131), Remnant
of East Ash Basin (REAB), November 14, 2016.
(Wood, 2019). Wood E&IS, Roxboro East and West Ash ponds H&H Update, Summary of
Supporting H&H Analyses, Duke Energy — Roxboro Steam Station, November 5, 2019.
December 18, 2019
FINAL Rev. 0 18

Wood Environment & Infrastructure Solutions, Inc.
Duke Energy —Roxboro Plant wood.
EAB Coal Combustion Residuals Surface Impoundment Closure Plan (Excavation)
FIGURES

2 3
4
5
6 7
8
ROX-FIG . 1-1 EAB CBE
REV. 0
# INTAKE BAY
INTAKE CANAL
(WOTUS)
(WOTUS)
N
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SUBSTATION
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DISCHARGE OUTLETS
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00
LINED PORTION OF INDUSTRIAL LANDFILL
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W
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REFERENCES
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1. ASH BASIN APPROXIMATE LIMIT OF WASTE PRESENTED IN THIS
E
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(FILTER DIKE)
THE WEST ASH BASIN
DRAWING WERE PREPARED BY SYNTERRA FOR DUKE ENERGY.
Rux)goid
i
1
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WESTERN DISCHARGE
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STRUCTURES
woo
TITLE
CCR SURFACE IMPOUNDMENT CLOSURE PLANWINGS
•
EAST ASH N CLOSURE Y EXCAVATION
v ROXBORO STEAM ELECTRIC PLANT
F
r,l
ROXBORO STEAM ELECTRIC PLANT
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'
Environment & Infrastructure Solutions
4021 STIRRUP CREEK DRIVE, SUITE 100
PERSON COUNTY, NORTH CAROLINA
DURHAM NC 27703
TEL: [phone]
VICINITY MAP AND SITE PLAN
FAX: [phone]
LICENSURE:
FOR
NCENG:F-1253
ISSUED FOR REVIEW
t s
NC GEOLOGY: C-247
SEAL
SCALE: AS SHOWN DES: IL
DUKEDWG TYPE: DWG DFTR SM
rmba,B
JOB NO: 7812190186 CHKD: AP
ENERGY®
KiM1 H,
NOT FOR
DATE: 12/18/2019 ENGR: SA
CONSTRUCTION
FILENAME: ROX-FIG. 1-1 EAB CBE.dwg APPD: CK
SITE VICINITY MAP - 1" = 5 MILES
DWG SIZE DRAWING NO. REVISION
MAP SOURCE: ESRI WORLD TOPOGRAPHIC BASEMAP
ANSI D FIGURE 1-1 0
0 12/18/2019 7812190186 DESIGN PLAN JL SM AP SA CK ISSUED FOR REVIEW
22"x34"
REV DATE JOB NO. PROJECT TYPE DES DFTR CHKD ENGR APPD DESCRIPTION
TENTHS 10 20
30 4
5
6 7
8
9 10
INCHES 1 2 3
Plotted By: Markham, Steven Sheet Set: 7812190186 — Roxboro CAMA Closure Plans Layout: OVERALL SITE EXISTING CONDITIONS — AERIAL December 18, 2019 08: 39:14am Q:\Duke Energy\Roxboro\7812190186 — CAMA Closure Plan \Exhibit\FIG. 1-1 EAB\ROX—FIG. 1-1 EAB CBE.dwg

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Plotted By: Markham, Steven Sheet Set: Roxboro East Ash Basin Closure Plan Layout: EXISTING CONDITIONS PLAN December 18, 2019 08: 56: 21am Q: \Duke Energy\Roxboro\7812190186 - CAMA Closure Plan\Exhibit\FIG. 3-1 EAB\ROX_FIG. 3-1 EAB CBE.dwg

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EAB Coal Combustion Residuals Surface Impoundment Closure Plan (Excavation)
TABLES

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EAB Coal Combustion Residuals Surface Impoundment Closure Plan (Excavation)
Table 2-1: NC CAMA Closure Plan Requirements
Summary and Cross Reference Table
Duke Energy, Roxboro Steam Electric Plant
Corresponding
No.
Description
Closure
Plan Section
Part II. Provisions for Comprehensive Management of Coal Combustion
Residuals § 130A-309.214 Closure Plans for all impoundments shall
include all of the following:
a. Facility and coal combustion residuals surface impoundment
description. — A description of the operation of the site that shall
include, at a minimum, all of the following:
Site history and history of site operations, including details on
1
the manner in which coal combustion residuals have been
3.1.1
stored and disposed of historically.
2
Estimated volume of material contained in the impoundment.
3.1.2
3
Analysis of the structural integrity of dikes or dams associated
3.1.3
with im oundment.
4
All sources of discharge into the impoundment, including volume
3.1.4
and characteristics of each discharge.
5
Whether the impoundment is lined, and, if so, the composition
1.5
thereof.
A summary of all information available concerning the
6
impoundment as a result of inspections and monitoring
3.1.6
conducted pursuant to this Part and otherwise available.
b. Site maps, which, at a minimum, illustrate all of the following:
All structures associated with the operation of any coal
combustion residuals surface impoundment located on the site.
1
For purposes of this sub -subdivision, the term "site" means the
3.2.1
land or waters within the property boundary of the applicable
electric generatin station.
All current and former coal combustion residuals disposal and
storage areas on the site, including details concerning coal
2
combustion residuals produced historically by the electric
1.1
generating station and disposed of through transfer to structural
fills.
3
The property boundary for the applicable site, including
1.1
established compliance boundaries within the site.
4
All potential receptors within 2,640 feet from established
3 2 2
compliance boundaries.
Topographic contour intervals of the site shall be selected to
5
enable an accurate representation of site features and terrain
2.1
and in most cases should be less than 20-foot intervals.

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Locations of all sanitary landfills permitted pursuant to this
Article on the site that are actively receiving waste or are closed,
6
as well as the established compliance boundaries and
3.2.3
components of associated groundwater and surface water
monitoring systems.
All existing and proposed groundwater monitoring wells
7
associated with any coal combustion residuals surface
2.1
im oundment on the site.
All existing and proposed surface water sample collection
8
locations associated with any coal combustion residuals surface
2.1
impoundment on the site.
c. The results of a hydrogeologic, geologic, and geotechnical
investigation of the site, including, at a minimum, all of the following:
1
A description of the hydrogeology and geology of the site.
4.1
A description of the stratigraphy of the geologic units underlying
2
each coal combustion residuals surface impoundment located
4.2
on the site.
The saturated hydraulic conductivity for (i) the coal combustion
residuals within any coal combustion residuals surface
3
impoundment located on the site and (ii) the saturated hydraulic
4.3
conductivity of any existing liner installed at an impoundment, if
an .
The geotechnical properties for (i) the coal combustion residuals
within any coal combustion residuals surface impoundment
located on the site, (ii) the geotechnical properties of any
existing liner installed at an impoundment, if any, and (iii) the
uppermost identified stratigraphic unit underlying the
4
impoundment, including the soil classification based upon the
4.4
Unified Soil Classification System, in -place moisture content,
particle size distribution, Atterberg limits, specific gravity,
effective friction angle, maximum dry density, optimum moisture
content, and permeability.
A chemical analysis of the coal combustion residuals surface
5
impoundment, including water, coal combustion residuals, and
4.5
coal combustion residuals -affected soil.
Identification of all substances with concentrations determined t
be in excess of the groundwater quality standards for the
6
substance established by Subchapter L of Chapter 2 of Title 15A
4.6
of the North Carolina Administrative Code, including all
laboratory results for these analyses.
7
Summary tables of historical records of groundwater sampling
4.6
results.
A map that illustrates the potentiometric contours and flow
directions for all identified aquifers underlying impoundments
(shallow, intermediate, and deep) and the horizontal extent of
8
areas where groundwater quality standards established by
4.7
Subchapter L of Chapter 2 of Title 15A of the North Carolina
Administrative Code for a substance are exceeded.
Cross -sections that illustrate the following: the vertical and
horizontal extent of the coal combustion residuals within an
9
impoundment; stratigraphy of the geologic units underlying an
4.8
impoundment; and the vertical extent of areas where

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groundwater quality standards established by Subchapter L of
Chapter 2 of Title 15A of the North Carolina Administrative Code
for a substance are exceeded.
d.
The results of groundwater modeling of the site that shall include, at
a minimum, all of the following:
An account of the design of the proposed Closure Plan
that is based on the site hydrogeologic conceptual model
developed and includes (i) predictions on post -closure
groundwater elevations and groundwater flow directions
and velocities, including the effects on and from the
1
potential receptors and
5.1
(ii) predictions at the compliance boundary for substances with
concentrations determined to be in excess of the groundwater
quality standards for the substance established by Subchapter L
of Chapter 2 of Title 15A of the North
Carolina Administrative Code.
Predictions that include the effects on the groundwater
chemistry and should describe migration, concentration,
mobilization, and fate for substances with concentrations
determined to be in excess of the groundwater quality standards
2
for the substance established by Subchapter L of Chapter 2 of
5.2
Title 15A of the North Carolina Administrative Code pre- and
post -closure, including the effects on and from potential
receptors.
A description of the groundwater trend analysis methods used t
demonstrate compliance with groundwater quality standards for
the substance established by Subchapter L of Chapter 2 of Title
3
15A of the North Carolina Administrative
5.3
Code and requirements for corrective action of groundwater
contamination established by Subchapter L of Chapter 2 of Title
15A of the North Carolina Administrative Code.
e.
A description of any plans for beneficial use of the coal combustion
residuals in compliance with the requirements of Section .1700 of
Subchapter B of Chapter 13 of Title 15A of the North Carolina
Administrative Code (Requirements for Beneficial Use of Coal
6.1
Combustion By -Products) and Section .1205 of Subchapter T of
Chapter 2 of Title 15A of the North Carolina Administrative Code
Coal Combustion Products Management).
f.
All engineering drawings, schematics, and specifications for the
proposed Closure Plan. If required by Chapter 89C of the General
7 1 7 2 7.3
Statutes, engineering design documents should be prepared, signed,
and sealed by a professional engineer.
g.
A description of the construction quality assurance and quality control
program to be implemented in conjunction with the Closure Plan,
7.3
including the responsibilities and authorities for monitoring and
testing activities, sampling strategies, and reporting requirements.
h.
A description of the provisions for disposal of wastewater and
management of stormwater and the plan for obtaining all required
8
permits.
i.
A description of the provisions for the final disposition of the coal
combustion residuals. If the coal combustion residuals are to be
9
removed, the owner must identify (i) the location and permit number
for the coal combustion residuals landfills, industrial landfills, or

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municipal solid waste landfills in which the coal combustion residuals
will be disposed and (ii) in the case where the coal combustion
residuals are planned for beneficial use, the location and manner in
which the residuals will be temporarily stored. If the coal combustion
residuals are to be left in the impoundment, the owner must (i) in the
case of closure pursuant to sub -subdivision (a)(1)a. of this section,
provide a description of how the ash will be stabilized prior to
completion of closure in accordance with closure and post -closure
requirements established by Section .1627 of Subchapter B of
Chapter 13 of Title 15A of the North Carolina Administrative Code
and (ii) in the case of closure pursuant to sub -subdivision (a)(1)b. of
this section, provide a description of how the ash will be stabilized
pre- and post -closure. If the coal combustion residuals are to be left
in the impoundment, the owner must provide an estimate of the
volume of coal combustion residuals remaining.
j. A list of all permits that will need to be acquired or modified to
10
complete closure activities.
k. A description of the plan for post -closure monitoring and care for an
impoundment for a minimum of 30 years. The length of the post -
closure care period may be (i) proposed to be decreased or the
frequency and parameter list modified if the owner demonstrates that
the reduced period or modifications are sufficient to protect public
health, safety, and welfare; the environment; and natural resources
and (ii) increased by the Department at the end of the post -closure
monitoring and care period if there are statistically significant
increasing groundwater quality trends or if contaminant
concentrations have not decreased to a level protective of public
11
health, safety, and welfare; the environment; and natural resources.
If the owner determines that the post -closure care monitoring and
care period is no longer needed and the Department agrees, the
owner shall provide a certification, signed and sealed by a
professional engineer, verifying that post -closure monitoring and care
has been completed in accordance with the post -closure plan. If
required by Chapter 89C of the General Statutes, the proposed plan
for post -closure monitoring and care should be signed and sealed by
a professional engineer. The plan shall include, at a minimum, all of
the following:
1
A demonstration of the long-term control of all leachate, affected
11.1
groundwater, and stormwater.
A description of a groundwater monitoring program that includes
(i) post -closure groundwater monitoring, including parameters to
be sampled and sampling schedules; (ii) any additional
2
monitoring well installations, including a map with the proposed
11.1
locations and well construction details; and (iii) the actions
proposed to mitigate statistically significant increasing
groundwater quality trends.
I. An estimate of the milestone dates for all activities related to closure
12.1
andpost-closure.
m. Projected costs of assessment, corrective action, closure, and post -
closure care for each coal combustion residuals surface
12.2
impoundment.
n. A description of the anticipated future use of the site and the
6.2
necessity for the implementation of institutional controls following

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EAB Coal Combustion Residuals Surface Impoundment Closure Plan (Excavation)
closure, including property use restrictions, and requirements for
recordation of notices documenting the presence of contamination, if
applicable, or historical site use.
§ 161JH-MU.212(0)(J) No later tnan eu aays after receipt of a proposea Liosure Tian, the
Department shall conduct a public meeting in the county or counties proposed Closure Plan and
alternatives to the public.
§ 130A-309.212(d) Within 30 days of its approval of a Coal Combustion Residuals Surface
Impoundment Closure Plan, the Department shall submit the Closure Plan to the Coal Ash
Management Commission.

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Table 4-1: Summary of Typical Geotechnical Index Properties
Duke Energy, Roxboro Steam Electric Plant

Table 4.1: Summary of Typical Material Properties
Soil Cover/Fill above or below the
Compacted CCR within the CCR
1
Foundation Soil (Residual) below the
Weathered Rock (WR) below theFill
Soil within the Embankment
Foundation Soil (Residual) below
Properties
CCR Basins
Basins'
Sedimented CCR within the CCR Basins
CCR Basins
CCR Basins and the Embankment
Dikes
the Embankment Dikes
Dikes
Silt/Sandy Silt (ML) - Predominantly
Silty Sand (SM) - Predominantly Bottom
Breaks down to Sandy Silt and
Soil Type
CL, SM, ML, and SC
Ash, Silt, Sandy Silt (ML) - Predominantly
SC, SM, ML, CL, CH
silty sand with rock fragments -
SM, SC, GW
SC, SM, CL, ML
Fly Ash
Fly Ash
Weathered Gneiss
Gray to dark gray, green, brown, and
Gray, light green, brown, and
Tan, green, brown, gray to dark
Color
Dark gray, tan, and brown
g y'
Grayto dark gray, black
g y'
Grayto dark gray, black
g y
Gray,black, and brown
black
orange
gray
Plasticity
NP to 15 - 23
Predominantly Non Plastic
Predominantly Non Plastic
NP to 14 - 28
**
NP - 14
NP - 26
Liquid Limit
NP to 24 - 39
Predominantly Non Plastic
Predominantly Non Plastic
NP to 17 - 70
**
NP - 21
NP - 35
Plasticity Index
NP to 5 - 22
Predominantly Non Plastic
Predominantly Non Plastic
NP to 1- 42
**
NP-7
NP - 16
Representative
Geometric Mean
Representative
Geometric Mean
Representative Range
Geometric Mean
Representative
Geometric Mean
Representative Range
Range
Range
Range
Natural Moisture Content (%)
11%- 34%
16%
22%- 34%
29%
11%- 77%
41%
11%- 58%
24%
2%- 17%
3%*
4%- 29%
Fines Content
13%-46%
33%
73%-79%
75%
22%-90%
53%
15%-55%
31%
**
15%-22%
**
Clay Content
0% - 26%
7%
13%- 19%
16%
0%- 15%
4%
2% - 43%
11%
**
7%- 10%
**
Blow Count - Uncorrected N Value (bpf)
WOH - 32
11
1 - 69
17
WOR - 27
3
2 - 53
18
50/0" - 50/5"
12 - 85
4 - 62
Moist Unit Weight
119 - 126 pcf
122 pcf
90 pcf
*
85 - 118 pcf
97 pcf
**
**
**
**
114 pcf*
Dry Unit Weight
93 - 106 pcf
100 pcf
65 pcf
*
50 - 90 pcf
66 pcf
**
**
**
**
103 pcf*
Specific Gravity
**
**
2.2*
*
2.1- 2.4
2.2
**
**
**
**
2.7*
Horizontal Hydraulic Conductivity (cm/sec)
**
**
**
**
**
**
**
**
**
**
**
Vertical Hydraulic Conductivity (cm/sec)
I 5.8E-05
I 8.0E-06 - 7.5E-04
5.5E-05
**
**
**
**
4.6E-06
Notes:
Outlier balues are not included in the table above. Please refer to lab data summary sheets presented with laboratory data for all available values.
NP: Non -Plastic
pcf: Pounds per Cubic Foot (lb/ft3)
WOR: Weight of Rod
WOH: Weight of Hammer
bpf: Blows per foot
*Only one lab test available
**No lab data available
'Data used to differentiate between compacted ash and sedimented ash was obtained from lab tests and boring logs from the 2015 and 2016 Amec Foster Wheeler, Geotechnical Investigation of East Ash Bain

Wood Environment & Infrastructure Solutions, Inc.
Duke Energy —Roxboro Plant wood.
EAB Coal Combustion Residuals Surface Impoundment Closure Plan (Excavation)
Table 10-1: Regulatory Permits, Approvals, or Requirements for Ash Basin
Closure by Excavation
Duke Energy, Roxboro Steam Electric Plant
Permit/Approval
General Permit
Regulating
Existing
Type of Regulatory
Name or Subject
Agency
Permit No.
Approval
Comments
(if applicable)
Mechanism or Not
Required
Permit modification likely
due to the increased
Air Quality
NCDEQ
Permit modification
heavy equipment vehicle
likely
traffic and potential dust
generated during closure
activities
Person
A local building permit is
Building Permit
County
New Permit
required for installation
of construction trailers
Modification or
abandonment of CAMA
CAMA Monitoring
Written NCDEQ
program monitoring
Plan
NCDEQ
DWR approval
wells require the
approval of the Division
of Water Resources
DWR
CCR
Impoundment
US EPA
Self -Regulating
Required postings to
Closure
CCR Rule
Public Record
CCR
Maintain CCR GW
Impoundment
US EPA
Self -Regulating
monitoring network and
Monitoring
CCR Rule
requirements as stated
Network
in 257.90 - 257.98
Clean Water Act
401
Clean Water Act
404
Cutting Trees
Permitting is required to
modify or abandon wells
Certificate of
and instrumentation on
Dam Safety
NCDEQ
Approval to Modify
regulatory dams through
the Division of Energy,
Mineral, and Land
Resources DEMLR
Ash Basin Dam -
Permitting is required to
Dam Safety
NCDEQ
PERSO-035
Certificate of
modify the dam in
Approval to Modify
accordance with the
Dam Safety Law of
1967, 15A NCAS

Wood Environment & Infrastructure Solutions, Inc.
Duke Energy —Roxboro Plant wood.
EAB Coal Combustion Residuals Surface Impoundment Closure Plan (Excavation)
Table 10-1: Regulatory Permits, Approvals, or Requirements for Ash Basin
Closure by Excavation
Duke Energy, Roxboro Steam Electric Plant
Permit/Approval
General Permit
Regulating
Existing
Type of Regulatory
Name or Subject
Agency
Permit No.
Approval
Comments
(if applicable)
Mechanism or Not
Required
02K.0201 (b)(2); an
application must be filed
with the Division of
Energy, Mineral, and
Land Resources
(DEMLR)
FGD Settling Pond Dam
- Permitting is required
to remove the dam in
accordance with the
Dam Safety Law of
Dam Safety
NCDEQ
PERSO-36
Certificate of
1967, 15A NCAS
Approval to Modify
02K.0201 (b)(2); an
application must be filed
with the Division of
Energy, Mineral, and
Land Resources
DEMLR
FGD Flush Pond Dam -
Permitting is required to
remove the dam in
accordance with the
Dam Safety Law of
Dam Safety
NCDEQ
PERSO-37
Certificate of
1967, 15A NCAS
Approval to Modify
02K.0201 (b)(2); an
application must be filed
with the Division of
Energy, Mineral, and
Land Resources
DEMLR
Utilization of or
modification to state or
federal highways to
DOT - General
transport CCR will
require consultation or
notification to relevant
DOT agency
Temporary access or
Driveway Permit
NCDOT
driveway permits as
needed

Wood Environment & Infrastructure Solutions, Inc.
Duke Energy —Roxboro Plant wood.
EAB Coal Combustion Residuals Surface Impoundment Closure Plan (Excavation)
Table 10-1: Regulatory Permits, Approvals, or Requirements for Ash Basin
Closure by Excavation
Duke Energy, Roxboro Steam Electric Plant
Permit/Approval
General Permit
Regulating
Existing
Type of Regulatory
Name or Subject
Agency
Permit No.
Approval
Comments
(if applicable)
Mechanism or Not
Required
Land disturbance
activities outside of the
ash basin will exceed
one acre, therefore in
conformance with 15A
NCAC 04, an E&SC
Erosion and
NCDEQ and
Permit is required from
Sediment Control
Person
New Permit
Land Quality prior to
(E&SC)
County
commencement of
construction in those
areas. Note that land
disturbance includes tree
clearing and grubbing
and vehicular wheel or
tracking as disturbance.
Removal from or import
of material could be
Fire Ants
Restriction not likely
restricted dependent on
the potential for fire ants
and geographic regions
involved
Flood Damage
Prevention Ordinance of
Person County, Article 3
General Provisions,
Section C, requires a
Floodplain
Person
New Permit
Floodplain Development
Development
County
Permit prior to any
development activities
within FEMA mapped
Special Flood Hazard
Areas for the Flood
Insurance Rate Maps
Permits are required to
construct any water
supply well or water well
Large Capacity
system with a design
Water Supply Well
NCDEQ
New Permit possible
capacity equal to or
greater than 100,00
gallons per day - for
dewatering outside of
the ash basin

Wood Environment & Infrastructure Solutions, Inc.
Duke Energy —Roxboro Plant wood.
EAB Coal Combustion Residuals Surface Impoundment Closure Plan (Excavation)
Table 10-1: Regulatory Permits, Approvals, or Requirements for Ash Basin
Closure by Excavation
Duke Energy, Roxboro Steam Electric Plant
Permit/Approval
General Permit
Regulating
Existing
Type of Regulatory
Name or Subject
Agency
Permit No.
Approval
Comments
(if applicable)
Mechanism or Not
Required
If movement of CCR will
Multi -State
Not required
cross state lines, multi -
Agreement
state regulations might
apply
NPDES (National
Modification of NPDES
Pollution
Discharge
NCDEQ
NCO038377
Permit modification
may be necessary if new
Elimination
likely
source or outfall is
System)
created.
NPDES (National
Revision to existing
Pollution
sitewide permit or new
Discharge
Elimination
NCDEQ
Permit revision likely
permit may be required
System) Industrial
for access roads, staging
Stormwater
areas, etc.
NPDES (National
Pollution
Permit required for
Discharge
NCDEQ
New Permit possible
temporary and
Elimination
permanent stormwater
System)
rerouting.
Stormwater
Removal from or import
of vegetated material
could be restricted
Noxious Weeds
dependent on the
vegetation and
geographic regions
involved
Railroad
Construction activities
Easement,
adjacent to tracks/ballast
Access, or
or a new railroad
Crossing Permit
crossing require an
agreement or permit
In accordance with the
SPCC (Spill
Federal Water
Prevention Control
Modification of
Pollution Control Act
and
NCDEQ?
existing plan
(Clean Water Act) of
Countermeasure)
1974, Title 40, Code of
Plan
Federal Regulations,
Part 112.

Wood Environment & Infrastructure Solutions, Inc.
Duke Energy —Roxboro Plant wood.
EAB Coal Combustion Residuals Surface Impoundment Closure Plan (Excavation)
Table 10-1: Regulatory Permits, Approvals, or Requirements for Ash Basin
Closure by Excavation
Duke Energy, Roxboro Steam Electric Plant
General Permit I Regulating
Name or Subject I Agency
Permit/Approval
Existing Type of Regulatory
Permit No. Approval
(if applicable) Mechanism or Not
Required
Comments
Threatened or
Federal and/or state
Endangered
regulations may apply
Species:
including agency
Candidate
consultation and
Conservation
performing site -specific
Agreement
surveys within the proper
Avian Protection
NCDEQ
survey period (e.g.,
Plan(s)
And EPA
flowering period for listed
Bird and Bat
plant) to determine if
Conservation
Threatened or
Strategies
Endangered Species or
Eagle
Conservation Plan
their habitat exist within
Eagle Take Permit
the limits of disturbance
Solid Waste
Permit to
NCDEQ
Permit
Landfill expansion
Construct
Solid Waste
Permit to Operate
NCDEQ
Permit
Landfill expansion