Compiled Roxboro WAB Closure Option Analysis Report 1-18-19

Rev. 1 /15/19
Roxboro Steam Electric Plant West Ash Basin (WAB) Closure Options Analysis
Summary Report
This summary report (Report) presents the Closure Options Evaluation for the Roxboro West Ash Basin
(WAB) located at Duke Energy Progress Roxboro Steam Electric Plant, located at 1700 Dunnaway Road,
Semora, Person County, North Carolina. The Closure Options Evaluation involved developing ash basin
closure strategies and evaluating these options relative to one another to determine which option to
advance to more detailed engineering and closure plan development. The strategies discussed in the
Closure Options Evaluation are representative of the range of possible approaches for basin closure, and
do not constitute final closure plans as described in N.C. Gen. Stat. sec. 130A-309.214(a)(4). Final
closure plans will be submitted in 2019, as required by law, supported by detailed engineering designs
and any necessary updates to groundwater modeling and related analysis.
Duke Energy developed programmatic guidance for the closure analysis effort in early 2016 to provide
fleet -wide consistency to ash basin closure plan development. Duke Energy developed a relative
weighting and scoring system with input from the National Ash Management Advisory Board (NAMAB).
Using this system, Duke Energy evaluated and scored the alternatives using an options analysis
framework designed to identify the solution that balances environmental protection, cost, schedule and
local community impacts. It is noted that internal working draft versions of these 2015-2016 options
analyses for Allen, Belews Creek, Cliffside, Marshall, Mayo, and Roxboro were provided to NCDEQ, at its
request, in May and June 2018.
The 2016 internal working draft options analysis identified closure -in -place as the preferred solution for
Roxboro West Ash Basin (WAB) that is protective of the environment, safely closes the ash basin,
minimizes the other associated risks, and was the least cost to customers. A permit -level design was
developed for that option in 2016. The company then paused that work, pending determination that the
site would meet the requirements for a low -risk impoundment classification pursuant to CAMA, as
amended by House Bill 630. Duke Energy has completed those requirements at the Roxboro WAB site
for a low -risk classification and now has updated this analysis.
SITE BACKGROUND
The Roxboro Steam Electric Plant consists of four coal-fired units with a combined generating capacity of
2,422 megawatts. The plant began operation in 1966, with capacity additions in 1973 and 1980, and is
currently in active operation. Fly ash material is currently conveyed from operating units by a
pneumatic (dry) handling system for disposal on -site or commercial reuse off -site. For on -site disposal,
the dry fly ash is conveyed to silos, transferred to trucks, and then hauled for final disposal at an on -site
permitted industrial landfill area within the inactive East Ash Basin (EAB) area. For commercial reuse,
the dry fly ash is loaded on trucks from the collection silos and then transported off -site. Bottom ash
and pyrite CCR material are currently conveyed by wet sluicing methods for operating units and
deposited within the active WAB. Flue gas desulfurization (FGD) technology has been installed to
reduce sulfur dioxide emissions for the operating units. Gypsum material produced by scrubber
operations is either reused by a nearby commercial wallboard production plant or transported to the
on -site industrial landfill for disposal. Wastewater from scrubber operations is conveyed to the FGD
Pond and bioreactor treatment facilities, located within and/or adjacent to the WAB. Discharge from
the Roxboro WAB flows into the plant heated water discharge canal, which is part of the wastewater
treatment system under the NPDES permit. The discharge flow is ultimately released into Hyco Lake
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through NPDES Outfall 003. The scope of WAB closure will also include the WAB Southern Extension
Impoundment area located south of the WAB Dike No. 1.
The West Ash Basin has two dams which are regulated by the North Carolina Department of
Environmental Quality (NCDEQ):WAB Main Dam State ID PERSO-038 and WAB Dike No. 1 - State ID
PERSO-039.
In addition, the Roxboro WAB site includes FGD Pond features that are regulated as dams by the NCDEQ
including: FGD West Settling Pond Dikes - PERSO-040, FGD East Settling Pond Dikes - PERSO-041, and
FGD Forward Flush Pond Dikes - PERSO-042. The FGD Pond dikes will be decommissioned prior to
implementation of WAB closure. Figure 1 below presents the West Ash Basin and other related site
features.
Figure 1. West Ash Basin and Related Site Features
CLOSURE OPTIONS
For the Roxboro West Ash Basin, under the direction of Duke Energy, Wood Environment &
Infrastructure Solutions, Inc. (Wood) developed the following conceptual closure options that remain
under evaluation:
• WAB Option 1: Closure -by -Removal (On -Site new Landfill)
• WAB Option 2: Closure -by -Removal (to Mayo Landfill)
• WAB Option 4: Closure -in -Place Hybrid (Partial Removal and Capping)
• WAB Option 5: Closure -in -Place
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Rev. 1 /15/19
It should be noted that WAB Option 1: Closure -by -Removal (On -site new Landfill) was initially evaluated
as not feasible because of the space being reserved for future CCR-related features. This has been re-
evaluated and is presented as a current option. Prior alternatives that had been listed as Option 3
(Closure -by -Removal with On -Site EAB Landfill) and Option 6 (Closure -in -Place Hybrid Option using a
combination of close -in -place and On -Site EAB Landfill) were removed from consideration from the
Options Analysis. Option 3 was removed since it was assumed that if the WAB was required to be
excavated then it was also assumed that the EAB would need to be excavated as well and the logistics of
trying to install a new lined landfill in the EAB footprint and also excavate the EAB at the same time
would be very difficult compared to the remaining options. Option 6 was removed due to the
complexity of conducting an excavation in the EAB and then constructing a new landfill in this footprint
while at the same time performing a partial removal of the WAB to move to the new EAB landfill.
WAB Option 1 consists of excavating all ash material and impacted soil within the limits of the WAB and
placing the material in a permitted industrial landfill area constructed on -site west of the WAB. This
industrial landfill would be constructed with a base liner system and an infiltration barrier/cap system
meeting the requirements of the Federal Coal Combustion Residuals (CCR) Rule and N.C. Coal Ash
Management Act (CAMA). The scope also includes removal and disposal of ash and impacted
soil/sediment material within the WAB Southern Extension Impoundment. This option is represented by
the attached Figure WAB 1.1 and Figure WAB 1.2.
WAB Option 2 consists of excavating all ash material and impacted soil within the limits of the WAB and
placing the material in a permitted industrial landfill area located at Duke Energy's Mayo Steam Electric
Plant. This industrial landfill would be constructed with a base liner system and an infiltration
barrier/cap system meeting the requirements of the Federal Coal Combustion Residuals (CCR) Rule and
N.C. Coal Ash Management Act (CAMA). The scope also includes removal and disposal of ash and
impacted soil/sediment material within the WAB Southern Extension Impoundment. This option is
represented by the attached Figure WAB 2.1 and Figure WAB 2.2.
WAB Option 4 consists of excavating and consolidating ash material on the northwest side of the pond
area in the vicinity of the existing FGD Pond features. The consolidated ash fill will be graded for
drainage and closed with an infiltration barrier/cap system meeting the requirements of the Federal CCR
Rule and CAMA. The scope also includes modification of Dike No. 1 for seepage control, and removal
and disposal of ash and impacted soil/sediment material within the WAB Southern Extension
Impoundment. This option is represented by the attached Figure WAB 4.1, Figure WAB 4.2, and Figure
WAB 4.3.
WAB Option 5 consists of leaving the ash material within the ash basin, which would be capped with an
infiltration barrier/cap system meeting the requirements of the Federal CCR Rule and CAMA. The scope
also includes modification of Dike No. 1 for seepage control, and removal and disposal of ash and
impacted soil/sediment material within the WAB Southern Extension Impoundment. This option is
represented by the attached Figure WAB 5.1.
Tables 1, 2, and 3 of this report represent a tabulated summary of each evaluated closure option,
estimated quantities of ash and soil materials associated with each closure option, and a more detailed
overview of each closure option presented.
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Attachment A of this report includes figures and reference drawings to support conceptual review and
scope development for each closure option as follows:
• Figure WAB 1.1— WAB Closure Option 1 Concept Plan
• Figure WAB 1.2 — Proposed Landfill Area A
• Figure WAB 2.1— Location for Off -site Mayo Industrial Landfill & Haul Path
• Figure WAB 2.2 — WAB Closure Option 2 Concept Plan
• Figure WAB 4.1— WAB Closure Option 4 Concept Plan (2016 Concept)
• Figure WAB 4.2 — WAB Closure Option 4 Concept Profiles Sheet 1 of 2 (2016 Concept)
• Figure WAB 4.3 — WAB Closure Option 4 Concept Profiles Sheet 2 of 2 (2016 Concept)
• Figure WAB 5.1— WAB Closure Option 5 Concept Plan (2018 Concept)
Attachment B includes rough order of magnitude (ROM) cost estimates for each closure option.
Attachment C contains the scoring matrix which summarizes the composite scores of the various closure
options, the assumptions of which are outlined in Table 3 for each particular option.
METHODOLOGY
A scoring matrix was prepared to provide consistent evaluation of closure options for each of the
various site locations. This scoring evaluation tool can be found in Attachment C and considers the
following primary criteria:
• Environmental Protection and Impacts
• Cost
• Schedule
• Regional Factors
• Constructability
Rough Order of Magnitude Costs
A rough order of magnitude (ROM) Class 5 cost estimate was prepared for each of the closure options,
based on information and quantities developed during the conceptual design activities. The estimated
costs include construction, permitting, engineering design, post -construction O&M, and groundwater
monitoring. A tabulated summary of the preliminary closure cost estimates for the options considered
is provided below:
Summary of Current ROM Cost Estimates
Estimated
Estimated
Closure Option
Option Description
Construction
O&M Cost
Cost
(30 Years)
WAB Option 1
Closure -by -Removal (On -site new Landfill)
$401,836,116
$9,728,764
WAB Option 2
Closure -by -Removal (with Off -site Mayo
$537,198,399
$10,740,222
Plant Landfill)
Summary — Page 4

Rev. 1 /15/19
WAB Option 4
Closure -in -Place Hybrid Option
$206,191,143
$8,029,098
WAB Option 5
Closure -in -Place Option
$77,217,637
$19,394,964
As indicated by the cost estimate summary, WAB Option 5 - Closure -in -Place has the lowest total
estimated cost. Options 1 and 2 have the highest costs, which are, primarily attributed to the additional
cost for dewatering, excavation, hauling, and landfill development associated with other options
considered. Detailed tabulated ROM cost estimates are included in Attachment B.
Schedule
Within the scoring evaluation, estimates of the length of time required to initiate closure activities and
the anticipated construction duration are provided for each option. For the Closure -By -Removal
options, a substantial amount of effort is anticipated for site preparation and dewatering activities,
which dictates the longer estimated initiation times.
Option 1 is estimated to take 198 months or 16.5 years. Option 2 is estimated to take 198 months or
16.5 years. Option 4 is estimated to take 111 months or 9.3 years. Option 5 is estimated to take 79
months, or 6.6 years
A major driver in the estimated construction durations is the assumed material excavation/movement of
1 million cubic yards/year; therefore, the Closure -By -Removal options have a longer construction
duration, as it requires the movement of all ash materials, compared to the Hybrid and Closure -In -Place
options where material movement quantities are less and assumed capping rates (50 ac/year) would
overlap schedule -wise with excavation and/or grading. The excavation scenarios would extend beyond
both the current CAMA deadline of 2029 and the CCR deadline of 2034. Option 4 would be challenged
to complete by the current CAMA deadline of 2029 unless work were to begin in early 2020.
Option 5 is the only option which is estimated to enable completion prior to CAMA deadline of 2029.
Evaluation Criteria
This options analysis was developed as a decision -making tool in selection of closure options when
multiple methods are allowed under applicable regulations. The intent was to develop a decision
framework that used weighted scorings to balance environmental factors, cost, and the safety of
workers and the public. The options analysis incorporates Duke Energy's obligation as a regulated utility
to ensure that its closure decisions are protective of the environment and communities, while also being
prudent from a cost-effectiveness perspective.
The analysis considered multiple aspects in each criterion, including surface water impacts, groundwater
impacts, air emissions, greenfield disturbance, construction duration, imported soil needs,
transportation and noise impacts, stormwater management, long-term maintenance needs and post -
closure monitoring.
The company then combined these elements to provide a weighted sum for each criterion using the
following weights: environmental considerations (30%), cost (35%), schedule (15%), regional/community
Summary— Page 5

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factors (15%) and constructability (5%.). Duke Energy placed primary emphasis on environmental factors
and cost, which were approximately equal in weight. When considering all of the criteria and associated
weightings, the environmental considerations have a slightly higher weight than cost with the inclusion
of certain regional/community factors (transportation impact, noise impact, view impact) which are
effectively environmental considerations.
The scoring matrix provided in Attachment C, scores each option on a scale of 0 (least favorable) to 10
(most favorable) for each of the specified criteria. The scores for each option are then summed based
on specified criterion weighting, resulting in an overall weighted score for each option. The results of
the scoring evaluation for the Roxboro WAB closure options are summarized in the following table:
Criterion
Option
1
2
4
5
Environmental Protection and Impacts
2.7
2.7
2.6
2.6
Cost
1.4
0.5
2.7
2.8
Schedule
0.0
0.0
1.2
1.5
Regional Factors
1.1
0.2
1.2
1.2
Constructability
0.4
0.4
0.0
0.5
Total Score
5.6
3.8
7.8
8.6
DISCUSSION
The options analysis finds relatively similar rankings for environmental protection and impacts which
considers impacts to groundwater, surface water, air emissions based on miles driven, and avoidance of
greenfield disturbance. The analysis incorporates the latest groundwater modeling of the Roxboro WAB
that demonstrates groundwater near the basin responds similarly for several decades in all closure
options evaluated. The current modeling does not incorporate capping or removal of other potential
sources, subject to different legal requirements. If these additional areas were included, the closure
would take longer, cost more, and potentially disturb more habitat. The most effective step the
company can take to improve groundwater is to safely decant the free water from the ash basin, which
will occur in any closure approach.
In terms of duration of work and closure time, the Closure -In -Place Option 5 scenario is expected to
complete in 6.6 years, while the Closure -By -Removal Options 1 and 2 are expected to take 16.5 years,
and would extend beyond the current CAMA deadline of 2029 and the CCR deadline of 2034. These
remain in our Options Analysis despite this for full transparency of the excavation alternatives.
Other aspects considered include regional impacts to the community related to imported soil needs,
transportation and noise. For the off -site landfill option, the Mayo landfill is located 15 miles from the
Summary— Page 6

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Roxboro site off of a public two-lane highway, which would present a degree of safety risk and road
congestion issues in the Option 2 excavation scenario.
Closure -By -Removal Option 1 is five times the estimated cost of the Closure -In -Place option and nearly
double the estimated cost of the Hybrid Option. Closure -by -Removal Option 2 is almost seven times the
estimated cost of the Closure -In -Place and is more than double the estimated cost of the Hybrid Option.
While long-term modeling indicates a quicker reduction in the boron plume within the immediate
vicinity of the basin footprint for the Closure -By -Removal scenarios, compared to the Closure -in -Place
and hybrid scenarios, the modeled concentration points evaluated overtime at downstream locations
are nearly identical for all the closure options. Moreover, the quicker reduction is partially offset by the
fact that the modeled improvement is delayed in the Closure -By -Removal scenarios, compared to the
Closure -in -Place scenario, due to the extended construction time. In any event, the minor change in
modeled plume size, within the immediate vicinity of the basin footprint, is not enough to justify the
cost of the Closure -by -Removal scenarios, particularly when the impact and improvement do not
materially affect neighbors or other potential receptors.
The Hybrid Closure option ranks closely with Closure -In -Place, but also does not appear to produce
environmental benefits commensurate with the added cost. In addition, the Hybrid Closure option
presents concerns for construction feasibility associated with partial removal of ash, and slope
stabilization.
0101IMI11411610
Based on the conceptual designs for the selected closure options and evaluation of the criteria
established (environmental protection/impacts, cost, schedule, regional factors and constructability),
Closure -In -Place option (#5) or the Hybrid option (#4) were identified as the preferred options that best
balance the various considerations associated with basin closure.
ATTACHMENTS
• Table 1— Closure Option Summary (Identification of Options)
• Table 2 — Estimated Quantity Summary
• Table 3 — Closure Options Detail Descriptions
• Attachment A — Figures and Reference Drawings
• Attachment B - Rough Order of Magnitude (ROM) Cost Estimates
• Attachment C— Closure Options Evaluation Scoring Matrix
Summary— Page 7

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Table 1(WAB) — Closure Option Summary (Identification of Options)
Roxboro Steam Electric Plan West Ash Basin (WAB)
Option
Description
West Ash Basin (WAB) Option 1 consists of excavating ash material and a 1-
ft thick soil layer within the limits of the WAB and placing the material in an on -
site newly constructed permitted industrial landfill located west of the WAB
(Landfill Area A). This industrial landfill would be constructed with a base liner
system and an infiltration barrier/cap system meeting the requirements of the
Federal Coal Combustion Residuals (CCR) Rule and the N.C. Coal Ash
Management Act (CAMA). The scope also includes removal and disposal of
ash and impacted soil/sediment material within the WAB Southern Extension.
WAB Option 2 consists of excavating all ash material and impacted soil within
the limits of the WAB and placing the material in an off -site permitted industrial
landfill area located at Duke Energy's Mayo Steam Electric Plant. This
industrial landfill would be constructed with a base liner system and an
infiltration barrier/cap system meeting the requirements of the Federal Coal
Combustion Residuals (CCR) Rule and N.C. Coal Ash Management Act
(CAMA). The scope also includes removal and disposal of ash and impacted
soil/sediment material within the WAB Southern Extension Impoundment.
WAB Option 4 consists of excavating and consolidating ash material on the
northwest side of the pond area in the vicinity of the existing FGD Pond
features. The consolidated ash fill will be graded for drainage and closed with
an infiltration barrier/cap system meeting the requirements of the Federal CCR
Rule and CAMA. The scope also includes modification of Dike No. 1 for
seepage control, and removal and disposal of ash and impacted soil/sediment
material within the WAB Southern Extension Impoundment.
WAB Option 5 consists of leaving the ash material within the Ash Basin,
which would be capped with an infiltration barrier/cap system meeting the
requirements of the Federal CCR Rule and CAMA. The scope also includes
modification of Dike No. 1 for seepage control, and removal ash and
impacted soil/sediment material from within the WAB Southern Extension
Impoundment and placing in the WAB.
Page 1 of 1

Existing Ash
Ash Basin Area (requlatory bou
Ash Basin Area — Southern Extension Impoundment
(regulatory boundary)
In Place Ash Volume —
Ash Basin Area
In Place Ash Volume —
Southern Extension Impoundment
Ash Basin Dam Soil Volume
Ash Excavation Volume (Excavated Area)
Over Excavation Volume (1 ft.
Ash Volume in Final Closure Footprint -
Southern Extension Impoundment
Ash and Soil Disposal from East Ash Basin
On -Site Landfill Area
Soil Needed (18" Backfill Excavated Area and 18"
Onsite Landfill Soil for Closure Cap)
Offsite Topsoil Needed (6" over Closure -by -Removal
Area and Onsite Landfill Closure Cap)
Ash Volume in Final Closure Footprint -
Ash Basin Area
Ash Volume in Final Closure Footprint -
Southern Extension Impoundment
Ash Excavation Volume (Excavated Area) -
Ash Basin Area
For off -site disposal
Ash Excavation Volume (Excavated Area) -
Southern Extension Impoundment
For off -site disposal
Over Excavation Volume (1 ft.) —
For off -site disposal
Ash Regrading
Dam Soil Cut Volume
Soil Needed (Backfill Excavated Area and 18" Cover
Soil)

Offsite Topsoil Needed (6" for Final Cover)
Estimated Off -site Landfill Area (Footprint)
Off -site Landfill Soil (assume 2' for liner and 18" for
cover)
Off -site Landfill Topsoil (assume 6" for
Ash Volume in Final Closure Footprint -
Ash Basin Area
Ash Volume in Final Closure Footprint -
Southern Extension Impoundment
Ash Excavation Volume (Excavated Area) -
Ash Basin Area
For off -site disposal
Ash Excavation Volume (Excavated Area) -
Southern Extension Impoundment
For on -site disposal
Over Excavation Volume (1 ft.) —
For off -site disposal
Ash Regrading
Dam Soil Cut Volume
Soil Needed (Backfill Excavated Area and 18" Cover
Soil)
Offsite Topsoil Needed (6" for Final Cove
Ash Volume in Final Closure Footprint -
Ash Basin Area
Ash Volume in Final Closure Footprint -
Southern Extension Impoundment
Ash Excavation Volume (Excavated Area) -
For off -site disposal
Ash Excavation Volume (Excavated Area) -
Southern Extension Impoundment
For on -site disposal
Over Excavation Volume (1 ft.) —
For off -site disposal
Ash Regrading —
Ash Basin Area
Dam Soil Cut Volume
Soil Needed (Backfill Excavated Area and 18" Cover
Soil)
Offsite Topsoil Needed (6" for Final Cove

Rev. 1 /15/19
Option
Table 3(WAB) — Closure Option Detail Descriptions
Roxboro Steam Electric Plan West Ash Basin (WAB)
Description
Closure -by -removal will be accomplished removal of the ash along with a 1-ft
thick soil layer within the limits of the WAB. This closure option also assumes
ash will also be removed from within the limits of the WAB Southern
Extension and permanently placed in a newly constructed onsite landfill
(Landfill Area A). The estimated volume of ash moved for closure is
12,966,000 cy, and the estimated volume of impacted soil moved is 300,080
cy. The West Ash Basin Main Dam will be breached to allow stormwater flow
to discharge into the Heated Water Discharge Canal, and ultimately Hyco
Lake.
WAB Dike No. 1 (Filter Dike) Modification — For this option, we have
assumed WAB Dike No. 1 will remain in place after completion of WAB
Closure -by -Removal to direct upstream flow into the existing discharge outlet
channel. The existing discharge outlet channel will then convey the
upstream flow to the Heated Water Discharge Canal, which is part of the
wastewater treatment system under the NPDES permit. The flow is then
discharged to Hyco Lake through NPDES Outfall 003. No modifications of
the existing dike will be performed.
WAB Southern Extension Impoundment Closure — For this option, the WAB
Southern Extension Impoundment will be closed with a Closure -by -Removal
approach. Removal of ash and impacted soil/sediment material will be
performed by dredging methods. The estimated quantity of ash and impacted
soil/sediment to be removed is 201,478 cubic yards. The waste material will
be deposited by sluicing within the limits of the WAB and will subsequently be
removed as part of the WAB Closure -by -Removal plan. Excavated settlement
pits or containment berms will be provided within the WAB for collection of the
dredged material.
Figures and reference drawings representing this option are as follows:
• Figure WAB 1.1 — Closure -by -Removal
• Figure WAB 1.2 — Proposed Landfill Area A
Environmental Protection and Impacts Considerations
• Estimated quantities used for cost estimates are summarized in
Table 2.
Cost Considerations
The total estimated construction cost is $401,836,116, and the estimated
post -closure O&M cost (30 years) is $9,728,764.
Schedule Considerations
For this option, the total estimated closure construction duration is 16.5
years, and the time to start ash removal is 2.5 years.
Regional Factors
• Ash basin closure area could be reused without consideration of
cover system after completion of closure by removal.
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Option
Table 3(WAB) — Closure Option Detail Descriptions
Roxboro Steam Electric Plan West Ash Basin (WAB)
Description
• The estimated quantity of imported soil are included in Table 2.
• There are currently no plans for beneficial reuse of ash after closure.
• Noise impact considered more significant than Closure -in -Place due
to duration, hauling and truck traffic but less significant than removal
to an off -site facility due to the reduced haul distance and reduced
public road use
• View impact for the site considered more significant than Closure -in -
Place and removal to off -site facility due to 200+ feet height of
proposed on -site landfill facility created on -site.
Constructability
• Closure -by -Removal has the second highest constructability score of
8 and is very close to Close -in -Place which has the highest overall
score for constructability of 10.
• Requires development of new landfill space to accommodate ash
removal.
• Option may require additional haul road or access improvements at
the site.
• Closure -by -removal has additional challenges due to longer duration
and larger amount of excavation and transport for removal of ash.
This closure option assumes all ash material will be removed from within the
limits of the WAB and permanently disposed of in the off -site permitted and
lined landfill area located at Duke Energy's Mayo Steam Electric Plant. The
estimated volume of ash material removed/hauled for closure is 12,966,000
cy, and the estimated volume of impacted soil removed/hauled is 300,080
cy. For this option, the WAB Main Dam will be breached to allow stormwater
flow to discharge into the Heated Water Discharge Canal, which is part of the
wastewater treatment system under the NPDES permit. The flow is then
discharged to Hyco Lake through NPDES Outfall 003.
WAB Dike No. 1 (Filter Dike) Modification — For this option, we have
assumed WAB Dike No. 1 will remain in place after completion of WAB
Closure -by -Removal to direct upstream flow into the existing discharge outlet
channel. The existing discharge outlet channel will then convey the
upstream flow to the Heated Water Discharge Canal, which is part of the
wastewater treatment system under the NPDES permit. The flow is then
discharged to Hyco Lake through NPDES Outfall 003. No modifications of
the existing dike will be performed.
WAB Southern Extension Impoundment Closure — For this option, the WAB
Southern Extension Impoundment will be closed with a Closure -by -Removal
approach. Removal of ash and impacted soil/sediment material will be
performed by dredging methods. The estimated quantity of ash and impacted
soil/sediment to be removed is 201,478 cubic yards. The waste material will
be deposited by sluicing within the limits of the WAB and will subsequently be
removed as part of the WAB Closure -by -Removal plan. Excavated settlement
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Option
Table 3(WAB) — Closure Option Detail Descriptions
Roxboro Steam Electric Plan West Ash Basin (WAB)
Description
pits or containment berms will be provided within the WAB for collection of the
dredged material.
Figures and reference drawings representing this option are as follows:
• Figure WAB 2.1 — Location for Off -site Mayo Industrial Landfill &
Haul Path
• Figure WAB 2.2 — Option 2 Concept Plan
Environmental Protection and Impacts Considerations
• Estimated quantities used for cost estimated for this option are
summarized in Table 2. This table also includes estimates for
expected miles driven for on -site and off -site hauling operations and
disturbed acres of greenfield to be used for the options evaluation.
Cost Considerations
For this option, the total estimated construction cost is $537,198,399, and
the estimate post -closure O&M cost (30 years) is $10,740,222.
Schedule Considerations
For this option, the total estimated closure construction duration is 16.5 years,
and the time to start ash removal is 2.5 years. This option will not meet the
CAMA deadline of 2029.
Regional Factors
• Entire site could be reused without consideration of cover system
after completion of Closure -by -Removal.
• The requirements for imported soil are included in Table 2.
• There are currently no plans for beneficial reuse of ash material after
closure.
• Estimated miles driven for closure is included in Table 2.
• Noise impact considered highest for removal.
• View impact considered highest for removal.
Constructability
• Closure -by -Removal has the second highest constructability score of
8 and is very close to Close -in -Place which has the highest overall
score for constructability of 10.
For this option, ash material will be consolidated on the northwest side of the
pond area in the vicinity of the FGD Pond features. The consolidated ash fill
will be closed by placement of an engineered cover system. Site drainage
will be provided by a constructed/stabilized channel that runs the length of
the pond area and discharges through a breach in the WAB Main Dam. The
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Option
Table 3(WAB) — Closure Option Detail Descriptions
Roxboro Steam Electric Plan West Ash Basin (WAB)
Description
flow will then be released into the Heated Water Discharge Canal, which is
part of the wastewater treatment system under the NPDES permit. The flow
is then discharged to Hyco Lake through NPDES Outfall 003.
WAB Dike No. 1 (Filter Dike) Modification — For this option, WAB Dike No. 1
will be modified to effectively control seepage by placement of a soil fill
buttress on the interior slope of the dike. A liner will be placed on the slope of
the proposed buttress berm. The existing discharge outlet channel will
convey the upstream flow to the Heated Water Discharge Canal, which is
part of the wastewater treatment system under the NPDES permit. The flow
is then discharged to Hyco Lake through NPDES Outfall 003.
WAB Southern Extension Impoundment Closure — For this option, the WAB
Southern Extension Impoundment will be closed with a Closure -by -Removal
approach. For this option, removal of ash and impacted soil/sediment material
will be performed by dredging methods. The estimated quantity of ash and
impacted soil/sediment to be removed is 201,478 cubic yards. The waste
material will be deposited by sluicing within the limits of the WAB and will be
incorporated into the final ash fill and grading plan. Excavated settlement pits
or containment berms will be provided within the WAB for collection of the
dredged material.
Figures and reference drawings representing this option are as follows:
• Figure WAB 4.1 — WAB Closure Option 4 Concept Plan
• Figure WAB 4.2 — WAB Closure Option 4 Concept Profiles Sheet 1
of 2
• Figure WAB 4.3 — WAB Closure Option 4 Concept Profiles Sheet 2
of 2
Environmental Protection and Impacts Considerations
• Estimated quantities used for cost estimated for this option are
summarized in Table 2. This table also includes estimates for
expected miles driven for on -site and off -site hauling operations and
disturbed acres of greenfield to be used for the options evaluation.
Cost Considerations
For this option, the total estimated construction cost is $206,191,143, and
the estimate post -closure O&M cost (30 years) is $8,029,098.
Schedule Considerations
For this option, the total estimated closure construction duration is 9.3 years,
and the time to start ash removal is 2.1 years. This option will likely not meet
the CAMA deadline of 2029.
Regional Factors
• A portion of the site would be available for reuse after excavation
with this option.
Page 4 of 6

Rev. 1 /15/19
Table 3(WAB) — Closure Option Detail Descriptions
Roxboro Steam Electric Plan West Ash Basin (WAB)
Option Description
• The requirements for imported soil are included in Table 2.
• There are currently no plans for beneficial reuse of ash material after
closure.
• Estimated miles driven for closure is included in Table 2.
• Noise impact higher than Close -in -Place but less the Closure -by -
Removal which has the highest impact.
• View impact higher than Close -in -Place but less the Closure -by -
Removal which has the highest impact.
Constructability
• Hybrid option has a significant constructability and feasibility concern
associated with potential for standing water over the final cover
system.
This closure option represents the approach of minimizing the excavation
and relocation of ash material within the WAB. For this option, the existing
ash deposits will generally be graded in the direction of the WAB Main Dam
and Dike No. 1. After completion of site grading, the entire closure area will
be closed by placement of an engineered cover system. Site drainage will be
provided by a stabilized channel that run the length of the pond area. The
flow will be discharged through a breach in WAB Main Dam and Dike No. 1.
The flow will then be released into the Heated Water Discharge Canal, which
is part of the wastewater treatment system under the NPDES permit. The
flow is then discharged to Hyco Lake through NPDES Outfall 003.
WAB Dike No. 1 (Filter Dike) Modification — For this option, WAB Dike No. 1
will be modified to effectively control seepage by placement of a soil fill
buttress berm on the interior slope of the dike. A liner will be placed on the
slope of the proposed buttress berm. The existing discharge outlet channel
will convey the upstream flow to the Heated Water Discharge Canal, which is
part of the wastewater treatment system under the NPDES permit. The flow
is then discharged to Hyco Lake through NPDES Outfall 003.
WAB Southern Extension Impoundment Closure — For this option, the WAB
Southern Extension Impoundment will be closed with a Closure -by -Removal
approach. Removal of ash and impacted soil/sediment material will be
performed by dredging methods. The estimated quantity of ash and
impacted soil/sediment to be removed is 201,478 cubic yards. The waste
material will be deposited by sluicing within the limits of the WAB and will be
incorporated into the final ash fill and grading plan. Excavated settlement
pits or containment berms will be provided within the WAB for collection of
the dredged material.
Page 5 of 6

Rev. 1 /15/19
Option
Table 3(WAB) — Closure Option Detail Descriptions
Roxboro Steam Electric Plan West Ash Basin (WAB)
Description
Figures and reference drawings representing this option are as follows:
• Figure WAB 5.1 — WAB Closure Option 5 Concept Plan
Environmental Protection and Impacts Considerations
• Estimated quantities used for cost estimated for this option are
summarized in Table 2. This table also includes estimates for
expected miles driven for on -site and off -site hauling operations and
disturbed acres of greenfield to be used for the options evaluation.
Cost Considerations
For this option, the total estimated construction cost is $77,217,637, and the
estimate post -closure O&M cost (30 years) is $19,394,964.
Schedule Considerations
For this option, the total estimated closure construction duration is 6.6 years,
and the time to start ash removal is 2.1 years. This is the only option that
would be able to meet the CAMA deadline of 2029.
Regional Factors
• Cover system could limit potential for site reuse.
• The requirements for imported soil are included in Table 2.
• There are currently no plans for beneficial reuse of ash material after
closure.
• Estimated miles driven for closure is included in Table 2.
• Noise impact was the lowest for the options considered.
• View impact was the lowest for the options considered.
Constructability
• Close -in -Place has highest overall score for constructability followed
by removal options.
Page 6 of 6

ATTACHMENTS
Attachment A - Figures and Reference Drawings

F
WAB 1.1
2 3 4 5 6 7 $ Rey: 1�5/19
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ASH REMOVAL
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SECTION 3-3
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1.4
TITLE
ROXBORO ASH BASIN CLOSURE
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4021 STIRRUP CREEK
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500
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420
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SECTION 5-5
500
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490
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SECTION 6-6
PROPOSED
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ESTIMATED QUANTITIES (THIS DRAWING)
DESCRIPTION
UNITS
ESTIMATED QUANTITY
ASH BASIN BOUNDARY AREA
ACRES
186
GEOMEMBRANE & GDL (2-D) BOUNDARY AREA
ACRES
203
EARTH WORK (ASH) CUT VOL
CU YARDS
1,334,041
EARTH WORK (ASH) FILL VOL
CU YARDS
1,278,377
SOIL FILL (OUTSIDE ASH BASIN BOUNDARY) VOLUME
CU YARDS
97,000
SOIL COVER VOLUME
CU YARDS
654,400
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8 9 10

ATTACHMENTS
Attachment B - Rough Order of Magnitude (ROM) Cost
Estimates

Roxboro WAB Closure Option 1 - Closure by Removal (On -Site new Landfill)
Closure Option Opinion of Probable Cost (ROM)
Rev. 1 /15/19
Duke Energy - Roxboro Steam Station
Person County, NC
Quantity
Unit
Unit Cost
Total Cost
Estimate Note
GENERAL
Surveying
186
Acres
$ 2,000
$ 372,000
Excavate and remove, including off -site disposal of existing storm water structures/piping. Price at $8k/day at 5 days per week for 4
weeks.
Abandon WAB Discharge Outlet Structures/Piping
1
EA
$ 200,000
$ 200,000
Unit Rate By Duke
SUBTOTALGENERAL
$ 572,000
EROSION/SEDIMENT CONTROL AND STORMWATER MANAGEMENT
West Ash Basin Sediment Control and Stormwater Management
186
Acres
$14,000.00
$ 2,604,000
Unit Rate By Duke
Permanent Stabilization Measures
186
Acres
$3,787.00
$ 704,382
Unit Rate By Duke
SUBTOTAL EROSION/SEDIMENT CONTROL AND STORMWATER MANAGEMENT
$ 3,308,382
EARTHWORK
Ash Basin Earthwork
Construction Entrance
50
LF
$65
$ 3,250
Amec Foster Wheeler experience based on $20/LF for 12-inch thick ABC and supporting geotextile at 20-foot width.
Clearing and Grubbing
Acres
$5,000
$ -
Clear and remove vegetation including trees, brush, shrubs.
Breaching Main Dam
1
LS
$1,000,000
$ 1,000,000
Unit Rate By Duke
Earthwork Cut to Fill
CY
$6.87
$ -
Unit Rate By Duke
Topsoil Stripping
Acres
$4,000.00
$ -
Unit Rate By Duke
Topsoil Material; if required (6-inch thick un-compacted fill, source
material off -site)
150040
CY
$11
$ 1,617,431
Unit Rate By Duke
Landfill Earthwork
Landfill Construction
93.3
Acres
$400,000
$ 37,320,000
Unit Rate By Duke
Landfill Closure
93.3
Acres
$150,000
$ 13,995,000
Unit Rate By Duke
SUBTOTAL EARTHWORK
$ 53,935,681
ASH BASIN DEWATERING, EXCAVATION, HAULING AND PLACEMENT
Temporary Dewatering (Ash Basin) Free Water
2
Mo
$416,667.00
$ 833,334
Unit Rate By Duke
Temporary Dewatering (Ash Basin) Construction Water
162
Mo
$583,333.00
$ 94,272,852
Unit Rate By Duke
Haul Road Construction
500
LF
$60.00
$ 30,000
Unit Rate By Duke
Excavation of Pond Ash and Loading in Trucks
13,167,478
CY
$8.43
$ 111,001,840
Unit Rate By Duke
Excavation of Residual Adjacent and Subsurface Soils and Loading in
Trucks
300080
CY
$10
$ 3,000,800
Unit Rate By Duke
Hauling, Placement, and Compaction of Pond Ash and Residual Soils to
Landfill Area A Landfill
13,467,558
CY
$4
$ 47,136,453
Unit Rate By Duke
Truck Wash
1
LS
$150,000.00
$ 150,000
Truck wash necessary to clean tires and undercarriage of trucks for over -the -road hauling. ROM costs based on experience with Duke
facilities.
SUBTOTAL ASH BASIN DEWATERING, EXCAVATION, HAULING AND PLACEMENT
$ 256,425,279
SUBTOTAL FINAL CLOSURE CONSTRUCTION COST
$ 314,241,342
Estimate Mobilization Cost (2.5% of Final Closure Construction Cost)
$ 7,856,034
OTHER COST
Design, Permitting and CQA
Closure Design/Engineering/Permitting (5% of Final Closure Construction
Costs)
1
LS
$15,712,067.09
$ 15,712,067
Construction Quality Assurance (CQA) (5% of Final Closure Construction
Costs)
1
LS
$15,712,067.09
$ 15,712,067
Subtotal Design, Permitting and CQA
$ 31,424,134
Post Closure Operations and Maintenance (analysis based on 30 year duration)
Landfill Area Maintenance
30
YR
$ 324,292
$ 9,728,764
Estimate at $3475.8/acre/year of capped area.
Landfill Area Monitoring
0
YR
$ -
Subtotal Post Closure Operations and Maintenance
$ 9,728,764
Additional Costs
Contingency (15% of Final Closure Construction Costs)
1
LS
$ 48,314,606
$ 48,314,606
Amec Foster Wheeler experience from previous projects
Subtotal Additional Costs
$ 48,314,606
TOTAL OPINION OF PROBABLE CLOSURE COST
$ 411,564,880
Rough Order of Magniture Cost Estimate
OPINION OF PROBABLE CLOSURE COST PER CY
$ 31.26
Based on Volume Placed in landfill
OPINION OF PROBABLE CLOSURE COST PER TON
$ 26.05
Based on Moist Unit Weight of 1.2 Tons/CY
OPINION OF PROBABLE CLOSURE COST PER ACRE
$ 2,212,714
Based on Estimated Closue Area
ESTIMATED QUANTITIES
Description
Estimated Landfill Property Area:
Estimated Landfill Development Area (including buffer and borrow area)
Estimated Lined Landfill Area:
Estimated West Ash Basin Closure Area:
Estimated WAB Restoration Area (after ash removal):
Estimated Ash Material Removed/Hauled Volume:
Estimated Ash Material Removed/Hauled Moist Wt:
Estimated Contaminated Soil Removed/Hauled Volume (WAB):
Estimated Contaminated Soil Removed/Hauled Moist Wt:
Total Estimated Ash and Contaminated Soil Removed/Hauled Volume:
Total Estimated Ash and Contaminated Soil Removed/Hauled Moist Wt:
Total Estimated Ash and Contaminated Soil Placed in Landfill Volume:
Estimate Notes:
1. This estimate is represented as Rough Order of Magnitude (ROM).
Est Quantity Units
103 Acres
213 Acres
93 Acres
186 Acres
186 Acres
13,167,478 CY
15,800,974 Tons (bsed on 1.2 Tons/CY Moist Unit Wt)
300,080 CY
450,120 Tons (based on 1.5 Tons/CY Moist Unit Wt)
13,467,558 CY
16,251,094 Tons (based on Moist Unit Wt )
10,774,046 Tons (based on 0.8 x Volume Hauled )
Page 1 of 1

Roxboro WAB Closure Option 2 - Closure by Removal (with Off -Site Landfill at Mayo Plant)
Closure Option Opinion of Probable Cost (ROM)
Duke Energy - Roxboro Steam Station
Person County, NC
Quantity
Unit
Unit Cost
Total Cost
Estimate Note
PROPERTY ACQUISTION
0
Acres
$3,000
$
Property Acquisition Cost Landfill
Best estimate of property values in area from review of tax values and for sale listing for large tracts in Person County.
SUBTOTAL PROPERTY ACQUISTION
$ -
GENERAL
186
Acres
$ 2,000
$ 372,000
Surveying
Existing discharge outlet features have already been abandoned. Assume cost for removal and disposal of existing discharge outlet pipe
and emergency spillway features at WAB Dike No. 1. In addition, Duke has requested removal of the existing weir structure as part of the
1
LS
$ 200,000
$ 200,000
WAB closure plan. The existing skimmer structure will remain in place. For estimating purposes, assume 5 person crew x 10 hr/day x
$40/hr including OH&profit = $2000/day. Est equipment cost at $6000/day to support work scope. Total est daily rate = . $2000 + $6000
Abandon WAB Discharge Outlet Structures
$8,000. Est 5 wks duration for worn x 5 days/wk x $8000/day = $200,000.
1
LS
$500,000
$ 5'0"00
Bridge or Embankment with culverts for discharge channel crossing
Place holder for cost with no technical basis.
1
LS
$1,000,000
$ 1,000,000
Breaching WAB Main Dam
Place holder for cost with no technical basis.
SUBTOTALGENERAL
$ 2,072,000
EROSION/SEDIMENT CONTROL AND STORMWATER MANAGEMENT
186
Acres
$14,000.00
$ 2,604,000
Unit Cost based on Amec Foster Wheeler experience and previous closure option cost estimates. Includes silt fence, wattles, surface
West Ash Basin Sediment Control and Stormwater Management
water diversions, sediment basins, temporary seeding and permanent seeding.
0
Acres
$14,000.00
$ _
Unit Cost based on Amec Foster Wheeler experience and previous closure option cost estimates. Includes silt fence, wattles, surface
Landfill Area Sediment Control and Stormwater Management
water diversions, sediment basins, temporary seeding and permanent seeding.
186
Acres
$3,787
$ 704,336Unit
Permanent Surface Stabilization Measures WAB
rate obtained from Duke Energy estimate summary data was used for consistency.
SUBTOTAL EROSION/SEDIMENT CONTROL AND STORMWATER MANAGEMENI
$ 3,308,336
DIKE NO. 1 (FILTER DIKE) SEEPAGE CONTROL MODIFICATION
Not required for this option
CY
$ -
Excavation of ash within limits of soil fill
CY
$ -
Foundation excavation and preparation
CY
$
Place graded stone fill against interior slope
CY
$ -
Place soil fill material
CY
$
Install liner material on interior slope
SUBTOTAL DIKE NO. 1 (FILTER DIKE) SEEPAGE CONTROL MODIFICATION
$ -
WAS SOUTHERN EXTENSION IMPOUNDMENT CLOSURE BY REMOVAL
1
LS
$300,000.00
$ 300,000
Mobilize and stage dredging operations
201,478
CY
$12.49
$ 2,516,460
Perform dredging for removal of ash &impacted sediment
CY
$14.50
$ 2,921,431
On -Road Hauling201,478
of Pond Ash and Impacted Soils to Mayo Plant
Unit Cost based on Duke Energy estimate averages was used for consistency.
CY
$2.00
$
(Off Road) Hauling of Pond Ash and Impacted Soils (within basin)
Unit Cost based on Duke Energy estimate averages was used for consistency.
201,478
t CY
$1.50
$ 302,217Unit
Placement of Ash and Impacted Soils In Landfill
Cost based on Duke Energy estimate averages was used for consistency.
SUBTOTAL WAB SOUTHERN EXTENSION IMPOUNDMENT CLOSURE BY REMOVAI
$ 6,040,108
EARTHWORK
Ash Basin Earthwork
1000
LF
$65
$ 65,000Unit
Construction Entrance
Cost based on Amec Foster Wheeler experience and previous closure option cost estimates.
5
Acres
$5,000
$ 25,000
Clear and remove vegetation including trees, brush, schrubs. Unit Cost based on Amec Foster Wheeler experience and previous closure
Clearing and Grubbing
option cost estimates. Increased to $5000/acre from review by NWH.
5
Acres
$4,000
$ 20,000
Strip topsoil to a minimum 6-inch depth and place in stockpile. Unit Cost based on Amec Foster Wheeler experience and previous closure
Topsoil Stripping
option cost estimates. Incresed to $4000/acre from review by NWH.
5
Acres
$5,000
$ 25,000
Clear and remove vegetation including trees, brush, schrubs. Unit Cost based on Amec Foster Wheeler experience and previous closure
Clearing and Grubbing
option cost estimates. Increased to $5000/acre from review by NWH.
0
CY
$9.24
$
Earthwork Cut to Waste
Unit Cost based on Duke Energy estimate averages was used for consistency.
10,000
CY
$9.24
$ 92,400
Earthwork Cut to Fill
Unit Cost based on Duke Energy estimate average was used for consistency.
CY
$13
$
Soil Fill Material
Unit Cost based on Duke Energy estimate averages was used for consistency. No change in estimate.
CY
$13
$
Topsoil Material
Unit Cost based on Duke Energy estimate averages was used for consistency. No change in estimate.
SUBTOTAL EARTHWORK
$ 227,400
ASH BASIN DEWATERING, EXCAVATION, HAULING AND PLACEMENT
6,000
LF
$60
$ 360,000
Amec Foster Wheeler experience based on 12-inch thick ABC and supporting geotextile at 20-fool width. Unit Cost based on Amec
Haul Road Construction 1 mile
Foster Wheeler experience and previous closure option cost estimates.
Est pumping rate = 2500/gpm. Est dewatering volume = 162,000,000 gals. Est pumping duration = 162,000,000 gal/2500 gal/min =
3
Mo
$ 416,667
$ 1,250,001
64,000 min/60 x24 = 45 days. Use 3 month duration for estimating purposes. Unit rate obtained from Duke Energy summary data was
Removal & Filtration of Free Water
used for consistency.
120
Mo
$ 583,333
$ 69,999,960
Assume required for duration of construction. Estimated duration 10 years. Unit rate obtained from Duke Energy summary data to
Removal & Treatment of Pore Water
consistency.
10,805,000
CY
$8.43
$ 91,086,150Unit
Excavation and Loading of Pond Ash for Truck Hauling
Cost based on Duke Energy estimate averages was used for consistency.
300,080
CY
$10.00
$ 3,000,800Unit
Excavation and Loading of Subsurface Soils for Truck Hauling
Cost based on Duke Energy estimate averages was used for consistency.
11,306,558
CY
$14.50
$ 163,945,091Unit
(On -Road) Hauling of Pond Ash and Impacted Soils to Mayo Plant
Cost based on Duke Energy estimate averages was used for consistency.
CY
$ -
Off Road Hauling of Pond Ash and Impacted Soils for On -site Landfill
11,306,558
CY
$1.50
$ 16,959,837
Placement of Pond Ash and Impacted Soils In Landfill
Unit Cost based on Duke Energy estimate averages was used for consistency. No change in estimate.
4
EA
$150,000
$ 600,000
Truck wash necessary to clean tires and undercarriage of trucks for over -the -road hauling. Unit Cost based on Amec Foster Wheeler
Truck Wash
experience and previous closure option cost estimates.
1
LS
$500,000
$ 500,000Placed
Bridge Repair and Maintenance
holder estimate for potential bridge repair and maintenance cost. NOT VERIFIED.
79,200
LF
$120
$ 9,504,000
Paved Haul Road Repair
Unit Cost based on Amec Foster Wheeler experience and previous closure option cost estimates.
SUBTOTAL ASH BASIN DEWATERING, EXCAVATION, HAULING AND PLACEMEN
$ 357,205,839
LANDFILL & CLOSE IN PLACE COVER CONSTRUCTION
Landfill Development Cost
Landfill Construction
103
Acres
$400,000
$ 41,200,000
Unit Cost based on Duke Energy estimate averages was used for consistency. No change in estimate.
103
Acres
$150,000
$ 15,450,000
Landfill Closure
Unit Cost based on Duke Energy estimate averages was used for consistency. No change in estimate.
Close in Place Option Cover System Construction
Acres
$5,000.00
$
Subgrade Preparation
Grade surface of subbase prior to installation of foal cover system. Unit costs from construction contractor
LF
$6.00
$
Anchor Trench
Furnish and install geotextile as a cushion layer. Unit costs from Glover; costs typically include material, QC testing, and installation
SY
3.00
$
8 oz/sy Non -Woven Geotextile
Furnish and install geotextile as a cushion layer. Unit costs from Glover; costs typically include material, QC testing, and installation
Cover System Geosynthetics (40-mil LLDPE Geomembrane and
SF
$1.02
$ _
Unit Cost based on Duke Energy estimate averages was used for consistency. Includes $0.42/sf for liner and $0.60/sf for GCL layer
Geocom osite Drainage Layer
($1.02/sf total)
CY
$13
$
Cover System 18" Soil Cover
Unit Cost based on Duke Energy estimate averages was used for consistency. No change in estimate.
Page 1 of 2

Roxboro WAB Closure Option 2 - Closure by Removal (with Off -Site Landfill at Mayo Plant)
Closure Option Opinion of Probable Cost (ROM)
Duke Energy - Roxboro Steam Station
Person County, NC
Quantity
Unit
Unit Cost
Total Cost
Estimate Note
Cover System Top Soil Placement
CY
$13
$
Unit Cost based on Duke Energy estimate averages was used for consistency. No change in estimate.
SUBTOTAL LANDFILL & CLOSE IN PLACE COVER CONSTRUCTION
$ 56,650,000
SUBTOTAL FINAL CLOSURE CONSTRUCTION COS
$ 425,503,683
Estimate at 1 % of Final Closure Construction Cost
MOBILIZATION COST
$ 4,255,037
TOTAL CLOSURE CONSTRUCTION COST (WITH MOBILIZATION)
$ 429,758,720
OTHER COST
Design, Permitting and CQA
Closure Design/Engineering/Permitting (5%ofTotal Closure
Construction Cost)
1
LS
$ 21,487,936
$ 21,487,936
Revised to 5
Construction Quality Assurance (CQA) (5 % of Total Closure Construction
Cost)
1
LS
$ 21,487,936
$ 21,487,936
Revised to 5%
Subtotal Design, Permitting and CQA
$ 42,975,872
Post Closure Operations and Maintenance (analysis based on 30 year duration)
Close in Place (Capped) Area Maintenance
0
YR
$
$
Unit Cost based on Duke Energy estimate averages was used for consistency. Estimate $3,475.80/ac/year.
Close in Place (Capped) Area Monitoring
0
YR
$
Not included in estimate per Duke Energy direction.
Landfill Area Maintenance (103 acres)
30
YR
$ 358,007
$ 10,740,222
Unit Cost based on Duke Energy estimate averages was used for consistency. Estimate $3,475.80/ac/year.
Landfill Area Monitoring
0
YR
$
Not included in estimate per Duke Energy direction.
Subtotal Post Closure Operations and Maintenance
$ 10,740,222
Additional Costs
Contingency 15% of Total Closure Construction Cost
1
LS
$ 4,463,
6808
$ 64,463,808
Amec Foster Wheeler experience from previous projects
Subtotal Additional Costs
$ 64,463,808
TOTAL OPINION OF PROBABLE CLOSURE COST
$ 547,938,621
Rough Order of Magniture Cost Estimate
OPINION OF PROBABLE CLOSURE COST PER CY
$ 50.71
Based on Volume Placed in landfill
OPINION OF PROBABLE CLOSURE COST PER TON
$ 42.26
Based on Moist Unit Weight of 1.2 Tons/CY
OPINION OF PROBABLE CLOSURE COST PER ACRE
$ 2,945,907
Based on Estimated Closue Area
ESTIMATED QUANTITIES
Description
Estimated Lined Landfill Area:
Estimated West Ash Basin Closure Area:
Estimated WAB Restoration Area (after ash removal):
Estimated Ash Material Removed/Hauled Volume (WAB):
Estimated Ash Material Removed/Hauled Moist Wt (WAB):
Estimated Ash/Sediment Material Removed/Hauled Volume (SEI):
Estimated Ash/Sediment Material Removed/Hauled Moist Wt (SEI):
Estimated Contaminated Soil Removed/Hauled Volume (WAB):
Estimated Contaminated Soil Removed/Hauled Volume (Disch Channel):
Estimated Contaminated Soil Removed/Hauled Moist Wt:
Total Estimated Ash and Contaminated Soil Removed/Hauled Volume:
Total Estimated Ash and Contaminated Soil Removed/Hauled Moist Wt:
Total Estimated Ash and Contaminated Soil Placed in Landfill Volume:
Estimate Notes:
1. This estimate is represented as Rough Order of Magnitude (ROM).
Est Quantity Units
103 Acres
186 Acres
186 Acres
10,805,000 CY Revised 10/1/18
12,966,000 Tons (based on 1.2 Tons/CY Moist Unit Wt) Revised 10/1/18
201,478 CY
241,774 Tons (based on 1.2 Tons/CY Moist Unit Wt)
300,080 CY
0 CY
450,120 Tons (based on 1.5 Tons/CY Moist Unit Wt)
11,306,558 CY
13,657,894 Tons (based on Moist Unit Wt)
9,045,246 Tons (based on 0.8 x Volume Hauled )
Page 2 of 2

Roxboro WAB Closure Option 4 - Close in Place Hybrid (CAP Concept)
Closure Option Opinion of Probable Cost (ROM)
Duke Energy - Roxboro Steam Station
Person County, NC
Quantity
Unit
Unit Cost
Total Cost
Estimate Note
PROPERTY ACQUISTION
Acres
$3,000
$
Property A union Cost
Best estimate of property values in area from review of tax values and for sale listing for large tracts in Person County. NOT VERIFIED.
SUBTOTAL PROPERTY ACQUISTION
$ -
GENERAL
1
LS
$ -
Estimate at 5 % of Final Closure Construction Cost (see below)
Mobilization
186
Acres
$ 2,000
$ 372,000
Surveying
Existing discharge outlet features have already been abandoned. Assume cost for removal and disposal of existing discharge outlet pipe
and emergency spillway features at WAB Dike No. 1. In addition, Duke has requested removal of the existing weir structure as part of the
1
LS
$ 200,000
$ 200,000
WAB closure plan. The existing skimmer structure will remain in place. For estimating purposes, assume 5 person crew z 10 hr/day x
$40/hr including OH&profit = $2000/day. Est equipment cost at $6000/day to support work scope. Total est daily rate = . $2000 + $6000
Abandon WAB Discharge Outlet Structures
$8,000. Est 5 wks duration for wors x 5 dayslwk x $8000/day = $200,000.
1
LS
$500,000
$ 500,000
Bridge or Embankment (with culverts) for discharge channel crossing
Place holder for cost with no technical basis.
1
LS
$1,000,000
$ 1,000,000
Breaching WAS Main Dam
Place holder for cost with no technical basis.
1
LS
$500,000
$ 500,000Place
Breaching WAB Dike No. 1
holder for cost with no technical basis.
SUBTOTALGENERAL
$ 2,572,000
EROSIONISEDIMENT CONTROL AND STORMWATER MANAGEMENT
186
Acres
$14,000.00
$ 2,604,000
Unit Cost based on Amec Foster Wheeler experience and previous closure option cost estimates. Includes silt fence, wattles, surface
West Ash Basin Sediment Control and Stormwater Management
water diversions, sediment basins, temporary seeding and permanent seeding.
186
Acres
$3,787
$ 704,336Unit
Permanent Surface Stabilization Measures
rate obtained from Duke Energy summary data was used for consistency.
10,000
LF
$56
$ 555,600
Unit rate obtained from Duke Energy summary data was used for consistency. Est 10' wide x 1.5' depth = 15 cf/ft length/27 cf/cy = .56
Permanent Riprap Stormwater Channels
cy/ft length..56 cy/ft x 2 tons/cy = 1.1 lons/ft length. Est $50/ton z 1.1 ton/ft = $55.56/If.
1
LS
$500,000
$ 500,000Place
Permanent Discharge Outlet Structure (Main Dam)
holder for cost.
SUBTOTAL EROSION/SEDIMENT CONTROL AND STORMWATER MANAGEMEN
$ 4,363,936
Assume required for this option. For this option, WAB Dike No. 1 will be modified to effectively control seepage by placement of
a soil fill buttress on the interior slope of the dike. In addition, Duke Energy has requested that a liner be placed on the slope of
DIKE NO. 1 (FILTER DIKE) SEEPAGE CONTROL MODIFICATION
the proposed buttress berm.
50,000
CY
$8.43
$ 421,500Estimate
Excavation of ash within limits of soil fill
100' wide x 15' deep avg x 900' length/27 = 50,000 cy
8,333
CY
$9.24
$ 76,997
Foundation excavation and preparation
Estimate 50' wide x 5' deep x 900727 = 8333 cy
3,333
CY
$13
$ 43,329
Place graded Stone fill against interior slope
Estimate 2' stone fill depth x 50' slope length x 900727 = 3333 cy
21,333
CY
$13
$ 277,329
Place soil fill material
Estimate (30' +2')/2 x 40' x 900727 = 21,333 cy
45,000
SF
$1.02
$ 45,900
Install liner material on interior Slope
Estimate 40' avg slope length x 900' = 45,000 sf
SUBTOTAL DIKE NO. 1 (FILTER DIKE) SEEPAGE CONTROL MODIFICATIO
$ 865,055
WAB SOUTHERN EXTENSION IMPOUNDMENT CLOSURE BY REMOVAL
1
LS
$300,000.00
$ 300,000
Mobilize and stage dredging operations
201,478
CY
$25.00
$ 5,036,950
Perform dredging for removal of ash &impacted sediment
175,853
CY
$8.43
$ 1,482,441Unit
Excavation and Loading of Pond Ash for Truck Hauling
Cost based on Duke Energy estimate averages was used for consistency. Assume loading/hauling required to support site grading.
175,853
CY
$2.05
$ 360,499Unit
(Off Road) Hauling of Pond Ash and Impacted Soils (within basin)
Cost based on Duke Energy estimate averages was used for consistency. Assume loading/hauling required to support site grading.
175,853
I
CY
$9.24
I
$ 1,624,882
For this option, assume placement similar to landfill for cost estimating. Loading & hauling estimate provided separately. Unit Cost based
Placement of Pond Ash and Impacted Soils
I
on Duke Energy estimate averages used for consistency. Use cut to fill unit cost for estimating purposes.
SUBTOTAL WAB SOUTHERN EXTENSION IMPOUNDMENT CLOSURE BY REMOVAIII
$ 5,336,950
EARTHWORK
Ash Basin Earthwork
1000
LF
$65
$ 65,000Unit
Construction Entrance
Cost based on Amec Foster Wheeler experience and previous closure option cost estimates.
5
Acres
$5,000
$ 25,000
Clear and remove vegetation including trees, brush, schmbs. Unit Cost based on Amec Foster Wheeler experience and previous closure
Clearing and Grubbing
option cost estimates. Increased to $5000/acre from review by NWH.
5
Acres
$4,000
$ 20,000
Strip topsoil to a minimum 6-inch depth and place in stockpile. Unit Cost based on Amec Foster Wheeler experience and previous closure
Topsoil Stripping
option cost estimates. Incresed to $4000/acre from review by NWH.
0
CY
$9.24
$
Earthwork Cut to Waste
Unit Cost based on Duke Energy estimate averages was used for consistency.
534,539
CY
$9.24
$ 4,939,140Unit
Earthwork Cut to Fill for grading and placement for drainage channel
Cost based on Duke Energy estimate average was used for consistency.
534,539
CY
$13
$ 6,949,007Unit
Soil Material (fill required for drainage channel)
Cost based on Duke Energy estimate averages was used for consistency. No change in estimate.
Topsoil Material; if required (6-inch thick un-compacted fill, source
CY
$13
$ -
material off -site)
Unit Cost based on Duke Energy estimate averages was used for consistency. No change in estimate.
SUBTOTAL EARTHWORK
$ 11,998,147
ASH BASIN DEWATERING, EXCAVATION, HAULING AND PLACEMENT
6,000
LF
$60
$ 360,000
Amec Foster Wheeler experience based on 12-inch thick ABC and supporting geotextile at 20-foot width. Unit Cost based on Amec
Haul Road Construction (1 mile)
Foster Wheeler experience and previous closure option cost estimates.
Est pumping rate = 2500/gpm. Est dewatering volume = 162,000,000 gals. Est pumping duration = 162,000,000 gal/2500 gal/min =
3
Mo
$ 416,667
$ 1,250,001
64,000 min/60 x24 = 45 days. Use 3 month duration for estimating purposes. Unit rate obtained from Duke Energy summary data was
Removal & Filtration of Free Water
used for consistency.
32
Mo
$ 583,333
$ 18,899,989
Assume required for duration of construction for this option because of excavation requirements.. Estimated duration 2.7 years. Unit rate
Removal & Treatment of Pore Water
obtained from Duke Energy summary data to consistency.
5,140,645
CY
$8.43
$ 43,335,637Unit
Excavation and Loading of Pond Ash for Truck Hauling
Cost based on Duke Energy estimate averages was used for consistency. Assume loading/hauling required to support site grading.
261,708
CY
$10.00
$ 2,617,080Unit
Excavation and Loading of Subsurface Soils for Truck Hauling
Cost based on Duke Energy estimate averages was used for consistency. Assume loading/hauling required to suppon site grading.
CY
$ -
On -Road Hauling of Pond Ash and Impacted Soils for Off -site Landfill
(Off Road) Hauling of Pond Ash and Impacted Soils for On -site Landfill
5,603,831
CY
$2.00
$ 11,207,662
(within basin closure area)
Unit Cost based on Duke Energy estimate averages was used for consistency. Assume loading/hauling required to support site grading.
5,603,831
CY
$9.24
$ 51,779,398
For this option, assume placement similar to landfill for cost estimating. Loading & hauling estimate provided separately. Unit Cost based
Placement of Pond Ash and Impacted Soils
on Duke Energy estimate averages was used for consistency. Use cut to fill unit cost for estimating purposes.
4
EA
$150,000
$ 600,000
Truck wash necessary to clean tires and undercarriage of trucks for over -the -road hauling. Unit Cost based on Amec Foster Wheeler
Truck Wash
experience and previous closure option cost estimates.
0
LS
$500,000
$
Bridge Repair and Maintenance
Placed holder estimate for potential bridge repair and maintenance cost. NOT VERIFIED.
1,000
LF
$120
$ 120,000
Paved Haul Road Repair
Unit Cost based on Amec Foster Wheeler experience and previous closure option cost estimates.
SUBTOTAL ASH BASIN DEWATERING, EXCAVATION, HAULING AND PLACEMEN
$ 130,169,768
CLOSE IN PLACE COVER CONSTRUCTION
Close in Place Option Cover System Construction
77
Acres
$5,000.00
$ 385,000
Subgrade Preparation
Grade surface of subbase prior to installation of foal cover system. Unit costs from construction contractor
9,000
LF
$6.00
$ 54,000
Anchor Trench
Fumish and install geotextile as a cushion layer. Unit costs from Glover; costs typically include material, QC testing, and installation
0
SF
$0.73
$
Geosynthetic Clay Liner (GCL) - Not required
Furnish and install geotextile as a cushion layer. Unit costs from Glover; costs typically include material, QC testing, and installation
372,680
SY
3.00
$ 1,118,040
8 oz/sy Non -Woven Geotextile
Furnish and install geotextile as a cushion layer. Unit costs from Glover; costs typically include material, QC testing, and installation
Cover System Geosynthetics (40-mil LLDPE Geomembrane and
3,354,120
SF
$1.02
$ 3,421,202
Unit Cost based on Duke Energy estimate averages was used for consistency. Includes $0.42/sf for liner and $0.60/sf for GCL layer
Geocomposite Drainage Layer
($1.02/sf total)
186,340
CY
$13
$ 2,422,420
Cover System 18" Soil Cover
Unit Cost based on Duke Energy estimate averages was used for consistency. No change in estimate.
Page 1 of 2

Roxboro WAB Closure Option 4 - Close in Place Hybrid (CAP Concept)
Closure Option Opinion of Probable Cost (ROM)
Duke Energy - Roxboro Steam Station
Person County, NC
Quantity
Unit
Unit Cost
Total Cost
Estimate Note
Cover System Top Soil Placement
62,113
CY
$13
$ 807,473Unit
Cost based on Duke Energy estimate averages was used for consistency. No change in estimate.
SUBTOTAL COVER SYSTEM CONSTRUCTION
$ 8,208,136
SUBTOTAL CLOSURE CONSTRUCTION COST
$ 163,513,992
Estimate at 1 % of Final Closure Construction Cost
MOBILIZATION COST
$ 1,635,140
TOTAL CLOSURE CONSTRUCTION COST (WITH MOBILIZATION
$ 165,149,131
OTHER COST
Design, Permitting and CQA
Closure Design/Engineering/Permitting (5% of Total Closure
Construction Cost)
1
LS
$ 8,257,457
$ 8,257,457
Revised to 5
Construction Quality Assurance (CQA) (5 % of Total Closure Construction
Cost)
1
LS
$ 8,257,457
$ 8,257,457
Revised to 5%
Subtotal Design, Permitting and CQ
$ 16,514,913
Post Closure Operations and Maintenance (analysis based on 30 year duration)
Close in Place (Capped) Area Maintenance (77 acres)
30
YR
$ 267,637
$ 8,029,098
Unit Cost based on Duke Energy estimate averages was used for consistency. Estimate $3,475.80/ac/year.
Close in Place (Capped) Area Monitoring
0
YR
$
Not included in estimate per Duke Energy direction.
Landfill Area Maintenance
0
YR
$
$
Unit Cost based on Duke Energy estimate averages was used for consistency. Estimate $3,475.80/ac/year.
Landfill Area Monitoring
0
YR
$
Not included in estimate per Duke Energy direction.
Subtotal Post Closure Operations and Maintenance
$ 8,029,098
Additional Costs
Contingency 15% of Final Closure Construction Costs
1
LS
$ 24,527,099
$ 2 4,527,099Amec
Foster Wheeler experience from previous projects
Subtotal Additional Cos
$ 24,527,099
TOTAL OPINION OF PROBABLE CLOSURE COST
$ 214,220,241
Rough Order of Magniture Cost Estimate
OPINION OF PROBABLE CLOSURE COST PER CY
$ 41.67
Based on Volume Placed in landfill
OPINION OF PROBABLE CLOSURE COST PER TON
$ 34.73
Based on Moist Unit Weight of 1.2 Tons/CY
OPINION OF PROBABLE CLOSURE COST PER ACRE
$ 1,151,722
Based on Estimated Closue Area
ESTIMATED QUANTITIES
Description
Estimated Lined Landfill Area:
Estimated West Ash Basin Closure Area:
Estimated WAB Restoration Area (after ash removal):
Estimated Close in Place Area:
Estimated Ash Material Removed/Hauled Volume (WAB):
Estimated Ash Material Removed/Hauled Moist Wt (WAB):
Estimated Ash/Sediment Material Removed/Hauled Volume (SEI):
Estimated Ash/Sediment Material Removed/Hauled Moist Wt (SEI):
Estimated Contaminated Soil Removed/Hauled Volume (WAB):
Estimated Contaminated Soil Removed/Hauled Volume (Disch Channel):
Estimated Contaminated Soil Removed/Hauled Moist Wt:
Total Estimated Ash and Contaminated Soil Removed/Hauled Volume:
Total Estimated Ash and Contaminated Soil Removed/Hauled Moist Wt:
Estimate Notes:
1. This estimate is represented as Rough Order of Magnitude (ROM).
Est Quantity Units
0 Acres
186 Acres
109 Acres
77 Acres
5,140,645 CY
6,168,774 Tons (bsed on 1.2 Tons/CY Moist Unit Wt)
201,478 CY
241,774 Tons (bsed on 1.2 Tons/CY Moist Unit Wt)
175,853 CY
85,855 CY
392,562 Tons (based on 1.5 Tons/CY Moist Unit Wt)
5,603,831 CY
6,803,110 Tons (based on Moist Unit Wt)
Page 2 of 2

Roxboro WAB Closure Option 5 - Close in Place (Minimum Excavation)
Closure Option Opinion of Probable Cost (ROM)
Duke Energy - Roxboro Steam Station
Person County, NC
Quantity
Unit
Unit Cost
Total Cost
Estimate Note
PROPERTY ACQUISTION
Acres
$3,000
$
Property A union Cost
Best estimate of property values in area from review of tax values and for sale listing for large tracts in Person County. NOT VERIFIED.
SUBTOTAL PROPERTY ACQUISTION
$ -
GENERAL
1
LS
$ -
Estimate at 5 % of Final Closure Construction Cost (see below)
Mobilization
186
Acres
$ 2,000
$ 372,000
Surveying
1
LS
$500,000
$ 500,000Place
Bridge or Embankment (with culverts) for discharge channel crossing
holder for cost with no technical basis.
1
LS
$1,000,000
$ 1,000,000
Breaching WAS Main Dam
Place holder for cost with no technical basis.
2
EA
$ 150,000
$ 300,000
Abandon WAB Discharge Outlet Structures
Estimate at $150klriser
1
LS
$500,000
$ 5'0"00
BreachingWAP Dike No. 1
Place holder for cost with no technical basis. NOT VERIFIED.....
SUBTOTALGENERAL
$ 2,672,000
EROSION/SEDIMENT CONTROL AND STORMWATER MANAGEMENT
186
Acres
$14,000.00
$ 2,604,000
Unit Cost based on Anise Foster Wheeler experience and previous closure option cost estimates. Includes silt fence, wattles, surface
West Ash Basin Sediment Control and Stormwater Management
water diversions, sediment basins, temporary seeding and permanent seeding.
Acres
$3,787
$ 704,336ace
Permanent Drainage and SurfaceStabilization Measures
Unit rate obtained from Duke Energy summary data was used for consistency.
10,000
LF
$56
$ 555,600
Unit rate obtained from Duke Energy summary data was used for consistency. Est 10' wide x 1.5' depth = 15 cf/ft length/27 cf/cy = .56
Permanent Riprap Stormwater Channels
cy/ft length..56 cy/ft x 2 tons/cy = 1.1 lons/ft length. Est $50/ton x 1.1 ton/ft = $55.56/1f.
1
LS
$500,000
$ 5101000
Permanent Discharge Outlet Structure Main Dam
Place holder for cost.
SUBTOTAL EROSION/SEDIMENT CONTROL AND STORMWATER MAINAGEMEN1
$ 4,363,936
Assume required for this option. For this option, WAS Dike No. 1 will be modified to effectively control seepage by placement of
a soil fill buttress on the interior slope of the dike. In addition, Duke Energy has requested that a liner be placed on the slope of
DIKE NO. 1 FILTER DIKE SEEPAGE CONTROL MODIFICATION
Ithe proposed buttress berm.
50,000
CY
$8.43
$ 421,500
Excavation of ash within limits of soil fill
Estimate 1 00'wide x 15' deep avg x 900' length/27 = 50,000 cy
8,333
CY
$9.24
$ 76,997Estimate
Foundation excavation and preparation
50' wide x 5' deep x 900'l27 = 8333 cy
3,333
CY
$13
$ 43,329
Place graded stone fill against interior slope
Estimate 2' stone fill depth x 50' slope length z 900727 = 3333 cy
21,333
CY
$13
$ 277,329
Place soil fill material
Estimate (30' +2'y2 x 40' x 900'l27 = 21,333 cy
45,000
SF
$1.02
$ 45,900
Install liner material on interior slope
Estimate 40' avg slope length x 900' = 45,000 sf
SUBTOTAL DIKE NO. 1 (FILTER DIKE) SEEPAGE CONTROL MODIFICATION
$ 865,055
WAB SOUTHERN EXTENSION IMPOUNDMENT CLOSURE BY REMOVAL
1
LS
$300,000.00
$ 300,000
Mobilize and stage dredging operations
201,478
CY
$25.00
$ 5,036,950
Perform dredging for removal of ash & impacted sediment
201,478
CY
$8.43
$ 1,698,460Unit
Excavation and Loading of Pond Ash for Truck Hauling
Cost based on Duke Energy estimate averages was used for consistency. Assume loading/hauling required to support site grading.
201,478
CY
$2.05
$ 413,030
Off Road Hauling of Pond Ash and Impacted Soils within basin
201,478
CY
$9.24
$ 1,861,657
For this option, assume placement similar to landfill for cost estimating. Loading & hauling estimate provided separately. Unit Cost based
Placement of Pond Ash and Impacted Soils
on Duke Energy estimate averages used for consistency. Use cut to fill unit cost for estimating purposes.
SUBTOTAL WAS SOUTHERN EXTENSION IMPOUNDMENT CLOSURE BY REMOVAII
$ 5,336,950
EARTHWORK
Ash Basin Earthwork
1000
LF
$65
$ 65,000Unit
Construction Entrance
Cost based on Amec Foster Wheeler experience and previous closure option cost estimates.
5
Acres
$5,000
$ 25,000
Clear and remove vegetation including trees, brush, schrubs. Unit Cost based on Amec Foster Wheeler experience and previous closure
Clearing and Grubbing
option cost estimates. Increased to $5000/acre from review by NWH.
5
Acres
$4,000
$ 20,000
Strip topsoil to a minimum 6-inch depth and place in stockpile. Unit Cost based on Amec Foster Wheeler experience and previous closure
Topsoil Stripping
option cost estimates. Incresed to $4000/acre from review by NWH.
0
CY
$9.24
$
Earthwork Cut t0 Waste
Unit Cost based on Duke Energy estimate averages was used for consistency.
CY
$9.24
$
Earthwork Cut to Fill
Unit Cost based on Duke Energy estimate averages was used for consistency.
CY
$13
$
Soil Material 18 inches, minimum, source material on -site
Unit Cost based on Duke Energy estimate averages was used for consistency.
Topsoil Material; if required (6-inch thick un-compacted fill, source
CY
$13
$ -
material off -site)
Unit Cost based on Duke Energy estimate averages was used for consistency.
SUBTOTAL EARTHWORK
$ 110,000
ASH BASIN DEWATERING, EXCAVATION, HAULING AND PLACEMENT
6,000
LF
$60
$ 360,000
Amec Foster Wheeler experience based on 12-inch thick ABC and supporting geotextile at 20-fool width. Unit Cost based on Amec
Haul Road Construction
Foster Wheeler experience and previous closure option cost estimates.
Est pumping rate = 2500/gpm. Est dewatering volume = 162,000,000 gals. Est pumping duration = 162,000,000 gal/2500 gal/min =
3
Mo
$ 416,667
$ 1,250,001
64,000 min/60 x24 = 45 days. Use 3 month duration for estimating purposes. Unit rate obtained from Duke Energy summary data to
Removal & Filtration of Free Water (Initial Dewatering)
consistency.
0
Mo
$ 583,333
$
Removal &Treatment of Pore Water
Assume not required for In -place closure option.
1,314,364
CY
$8.43
$ 11,080,089Unit
Excavation and Loading of Pond Ash for Truck Hauling
Cost based on Duke Energy estimate averages was used for consistency. Assume loading/hauling required to support site grading.
0
CY
$10.00
$
Excavation and Loading of Subsurface Soils for Truck Hauling
Unit Cost based on Duke Energy estimate averages was used for consistency. Assume loading/hauling required to support site grading.
(On -Road) Hauling of Pond Ash and Impacted Soils for Off -site Landfill
CY
$ -
_ miles
(Off Road) Hauling of Pond Ash and Impacted Soils (within basin closure
1,314,364
CY
$2.00
$ 2,628,728
area)
Unit Cost based on Duke Energy estimate averages was used for consistency. Assume loading/hauling required to support site grading.
1,314,364
CY
$9.24
$ 12,144,723
For this option, assume placement similar to landfill for cost estimating. Loading & hauling estimate provided separately. Unit Cost based
Placement of Pond Ash and Impacted Soils
on Duke Energy estimate averages was used for consistency. Use cut to fill unit cost for estimating purposes.
4
EA
$150,000
$ 600,000
Truck wash necessary to clean tires and undercarriage of trucks for over -the -road hauling. Unit Cost based on Amec Foster Wheeler
Truck Wash
experience and previous closure option cost estimates.
0
LS
$500,000
$
Bridge Repair and Maintenance
Placed holder estimate for potential bridge repair and maintenance cost. NOT VERIFIED.
0
LF
$120
$
Paved Haul Road Repair
Unit Cost based on Amec Foster Wheeler experience and previous closure option cost estimates.
SUBTOTAL ASH BASIN DEWATERING, EXCAVATION, HAULING AND PLACEMEN
$ 28,063,541
CLOSE IN PLACE COVER CONSTRUCTION
Close in Place Option Cover System Construction
186
Acres
$5,000.00
$ 930,000
Sub fade Preparation
Grade surface of subbase prior to installation of final cover system. Unit costs from construction contractor
9,000
LF
$6.00
$ 54,000
Anchor Trench
Fumish and install geotextile as a cushion layer. Unit costs from Glover; costs typically include material, QC testing, and installation
0
SF
$0.73
$ -
Geosynthetic Clay Liner (GCL) - Not required
Furnish and install geotextile as a cushion layer. Unit costs from Glover; costs typically include material, QC testing, and installation
900,240
SY
3.00
$ 2,700,720
8 oz/sy Non -Woven Geotextile
Fumish and install geotextile as a cushion layer. Unit costs from Glover; costs typically include material, QC testing, and installation
Cover System Geosynthetics (40-mil LLDPE Geomembrane and
8,102,160
SF
$1.02
$ 8,264,203
Unit Cost based on Duke Energy estimate averages was used for consistency. Includes $0.42/sf for liner and $0.60/sf for GCL layer
Gsocomposite Drainage Layer
($1.02/sf total)
450,120
CY
$13
$ 5,851,560
Cover System 18" Soil Cover
Unit Cost based on Duke Energy estimate averages was used for consistency. No change in estimate.
150,040
CY
$13
$ 1,950,520
Cover System To Soil Placement
Unit Cost based on Duke Energy estimate averages was used for consistency. No change in estimate.
Page 1 of 2

Roxboro WAB Closure Option 5 - Close in Place (Minimum Excavation)
Closure Option Opinion of Probable Cost (ROM)
Duke Energy - Roxboro Steam Station
Person County, NC
Quantity
Unit
I Unit Cost
Total Cost
Estimate Note
SUBTOTAL COVER SYSTEM CONSTRUCTION
$ 19,751,003
SUBTOTAL CLOSURE CONSTRUCTION COST
$ 61,162,485
Estimate at 1 % of Final Closure Construction Cost
MOBILIZATION COST
$ 611,625
TOTAL CLOSURE CONSTRUCTION COST (WITH MOBILIZATION
$ 61,774,109
OTHER COST
Design, Permitting and CQA
Closure Design/Engineering/Permitting(5% of Total Closure
Construction Cost)
1
LS
$ 3,088,705
$ 3,088,705
Revised to 5%
Construction Quality Assurance (CQA) (5% of Total Closure Construction
Cost)
1
LS
$ 3,088,705
$ 3,088,705
Revised to 5%
Subtotal Design, Permitting and CQA
$ 6,177,411
Post Closure Operations and Maintenance (analysis based on 30 year duration)
Close in PlaceArea Maintenance 186 acres
(Capped) ( )
30
YR
$ 646,499
$ 19,394,964
Unit Cost based on Duke Ene estimate averages was used for consistency. $3,475.80/ac/ ear.
Energy 9 Y Y
Close in Place (Capped) Area Monitoring
0
YR
$
Not included in estimate per Duke Energy direction.
Landfill Area Maintenance
0
YR
$
$
Unit Cost based on Duke Energy estimate averages was used for consistency. Estimate $3,475.80/ac/year.
Landfill Area Monitoring
0
YR
$
Not included in estimate per Duke Energy direction.
Subtotal Post Closure Operations and Maintenance
$ 19,394,964
Additional Costs
Contingency (15°/a of Final Closure Construction Costs)
1
LS
$ 9,266,116
$ 9,266,116Amec
Foster Wheeler experience from previous projects
Subtotal Additional Costs
$ 9,266,116
TOTAL OPINION OF PROBABLE CLOSURE COST
$ 96,612,601
Rough Order of Magniture Cost Estimate
OPINION OF PROBABLE CLOSURE COST PER CY
$ 73.51
Based on Volume Placed in landfill
OPINION OF PROBABLE CLOSURE COST PER TON
$ 61.25
Based on Moist Unit Weight of 1.2 Tons/CY
OPINION OF PROBABLE CLOSURE COST PER ACRE
$ 519,423
Based on Estimated Closue Area
ESTIMATED QUANTITIES
Description
Estimated Lined Landfill Area:
Estimated West Ash Basin Closure Area:
Estimated WAB Restoration Area (after ash removal):
Estimated Close in Place Area
Estimated Ash Material Removed/Hauled Volume (WAB):
Estimated Ash Material Removed/Hauled Moist Wt (WAB):
Estimated Ash/Sediment Material Removed/Hauled Volume (SEI):
Estimated Ash/Sediment Material Removed/Hauled Moist Wt (SEI):
Estimated Contaminated Soil Removed/Hauled Volume (WAB):
Estimated Contaminated Soil Removed/Hauled Moist Wt:
Total Estimated Ash and Contaminated Soil Removed/Hauled Volume:
Total Estimated Ash and Contaminated Soil Removed/Hauled Moist Wt:
1. This estimate is represented as Rough Order of Magnitude (ROM).
Est Quantity Units
0 Acres
186 Acres
0 Acres
186 Acres
1,314,364 CY
1,577,237 Tons (bsed on 1.2 Tons/CY Moist Unit Wt)
201,478 CY
241,774 Tons (bsed on 1.2 Tons/CY Moist Unit Wt)
0 CY
0 Tons (based on 1.5 Tons/CY Moist Unit Wt)
1,515,842 CY
1,819,010 Tons (based on Moist Unit Wt)
Page 2 of 2

ATTACHMENTS
Attachment C - Closure Options Evaluation Scoring
Matrix

Rev. 1 /15/19
Site Name: Roxboro Station
Threshold Criteria: All closure options must comply with the following threshold criteria based on Duke
Energy Guiding Principals for Ash Basin Closure
1. Provide continued geotechnical stability meeting appropriate safety factors under applicable loading
conditions
2. Provide flow capacity and erosion resistance during design storm and flooding conditions
3. Effectively mitigate groundwater impacts (in conjunction with GW remediation where present)
4. Comply with applicable state and federal regulations (e.g. North Carolina Coal Ash Management Act)
Scoring for Evaluation of Closure Options
Closure Options Evaluation Worksheet
Roxboro Ash Basin Closure Project - Roxboro West Ash Basin (WAB)
Duke Energy
= Option -Specific User Input
1 = Calculated Value
Placeholder values have been entered in "User Input" cells to prevent division by zero error
text in calculated score cells.
Option
Description
Revision Notes
1
WAB Option 1- Closure by Removal (with On -site Landfill)
2
WAB Option 2 - Closure by Removal (to Mayo Landfill)
3
WAB Option 3 - Closure by Removal (with EAB Landfill Phases 7-9)
4
WAB Option 4 - Close in Place Hybrid Option (Partial Removal and Capping)
5
L6
WAB Option 5 - Close in Place Option (with Minimum Excavation)
WAB Option 6 - Hybrid Closure (Combination of Close in Place/Landfill)
Not carried through for further consideration
Environmental Protection and Impacts
Weight: 30%
•
Refer to This Area Not Used For Interpretation of Environmental Modeling Results
Modeled Plume Intersecting Surface Water
EM Sub -Scoring Sheet
• • •
•
24%
7.20%
Groundwater Impact Beyond the current
Refer to
This Area Not Used For Interpretation of Environmental Modeling Results
Compliance Boundary
EM Sub -Scoring Sheet
• •
•
24%
7.20%
Refer to
This Area Not Used For Interpretation of Environmental Modeling Results
Modeled Off -site Impact
EM Sub -Scoring Sheet
•
24%
7.20%
Rank per relative environmental impact to
Refer to
This Area Not Used For Interpretation of Environmental Modeling Results
groundwater
EM Sub -Scoring Sheet
•
13%
3.90%
Interpolation. Zero miles
Air emissions off -site (based on miles driven)
scores 10.
Truck miles driven
Miles • • . • • : • • • • 883,052
20,699,857
10
0
10
10
5%
1.50%
Air emissions on -site from closure implementation
Interpolation. Zero
(based on miles driven)
gallons scores 10.
Truck miles driven
Miles • :.. • 0
887,756
0
10
6
9
5%
1.50%
Interpolation. Zero acres Disturbed acres of
Avoidance of greenfield disturbance scores 10. greenfield Acres • • 25 117 1 0 9 10
5% 1.50%
. 2.7 2.7 2.7 2.6
00% 30.00%
Cost Weight:
6M
35%
• . . • • . • . .
- �
• • . • •
•
• . •
Interpolation. Min value
Closure Cost
Closure Cost Million $
-
$ 77.20 $ 537.20 2.9 0.0 7.2 10.0
80% 28.00%
scores 10. Max value
Operation, Maintenance and Monitoring Cost
(Evalluated for 30 years) scores 0.
OM&M Cost I Million $
$ 8.00 $ 19.40 8.5 7.6 10.0
1 0.0
20%
7.00%
Weighted • - - 1.4 0.5 2.7
2.8
100%
35.00%
Schedule
6
Weight: 15%
•
-• - -.111-
M
pt on Option
Interpolation Minimum Time to move first
Initiation Time
value scores 10 ash Years 2.1 2.5
0
0
10 10 30% 4.50%
Interpolation Minimum
Project Duration (to completion of closure)
value scores 10
Estimated durations Year 6.6 16.5
0
0
7 10 70% 10.50%
1of2

Rev. 1 /15/19
Scoring for Evaluation of Closure Options
Closure Options Evaluation Worksheet
Roxboro Ash Basin Closure Project - Roxboro West Ash Basin (WAB)
Duke Energy
Placeholder values have been entered in "User Input" cells to prevent division by zero error
Site Name: Roxboro Station = Option -Specific User Input text in calculated score cells.
1 = Calculated Value
•pill
0.0
0.0
1.2
1.5
100%
15.00%
Regional Factors
Weight:
15%
•
•
Plan or potential for beneficial reuse of site
Subjective
Not Used For Subjective Scoring
•
5%
U.75%
Interpolation Min value
scores 10 Max value
Imported soil needs
scores 0
Soil Imported
CY • ::
• • s .1
332,347
782,972
7
10
0
4
5%
0.75%
Interpolation. Maximum
Beneficial reuse of CCR (not considered applicable)
value scores 10.
Fraction Used
None •
• • •
0
0
10
10
10
10
0%
0.00%
Interpolation Min value
scores 10 Max value
Transportation impact (based on miles driven)
scores 0
Miles Driven
Miles
• • • • •
1,471,753
34,499,762
10
0
10
10
65%
9.75%
Noise impact due to on -site activity (based on
proximity of neighbors to on -site work areas)
Subjective 0 to 10
•
5%
0.75%
Not Used For Subjective Scoring
View impact (based on final height of storage
facility and land uses within viewshed)
Subjective 0 to 10
•
20%
3.00%
•
1.1
0.2
1.2
1.2
100%
15.00%
Constructability
Weight:
5%
Subjective 0 to 10: 10 is
Not Used For Subjective Scoring
Consider stormwater management, geotechnical,
the easiest while 0 is the
and dewatering
riskiest
100%
5.00%
•
0.4
0.4
0.0
0.5
• • • •
5.6
3.8
7.8
8.6
2of2

Criteria for Evaluation of Closure Options
Closure Options Evaluation Worksheet
Ash Basin Closure - Master Programmatic Document
Duke Energy
Threshold Criteria: All closure options must comply with the following threshold criteria based on Duke Energy Guiding
Principals for Ash Basin Closure
1. Provide continued geotechnical stability under applicable loading conditions and safety factors
2. Provide flow capacity and erosion resistance during design storm and flooding conditions
3. Effectively mitigate groundwater impacts
4. Comply with applicable state and federal regulations (e.g. North Carolina Coal Ash Management Act)
Category
Criterion
Guidance
Modeled Plume Intersecting Surface Water
Refer to scoring system on Environmental Modeling (EM) Sub -Scoring worksheet.
Groundwater Impact Beyond the Current Compliance Boundary
Refer to scoring system on Environmental Modeling (EM) Sub -Scoring worksheet.
Modeled Off -site Impact
Refer to scoring system on Environmental Modeling (EM) Sub -Scoring worksheet.
Relative rank based on visual interpretation of modeled boron plume
Refer to scoring system on Environmental Modeling (EM) Sub -Scoring worksheet.
Air emissions off -site
Based on truck miles driven for hauling CCR and soil.
Air emissions on -site from closure implementation
Based on total cubic yards of cut and fill on site as a surrogate for gallons of fuel
consumed
Avoidance of greenfield disturbance
Refer to Scoring System and Required Input columns on scoring sheet.
Capital Cost
From rough order -of -magnitude cost estimate or detailed cost estimate.
Operation, Maintenance and Monitoring Cost
Initiation Time
From preliminary schedule for designing, permitting, bidding and constructing the
option.
Construction Duration
Plan or potential for beneficial reuse of site
Refer to Scoring System and Required Input columns on scoring sheet.
Imported soil needs
Refer to Scoring System and Required Input columns on scoring sheet.
Beneficial reuse of CCR
Refer to Scoring System and Required Input columns on scoring sheet.
Transportation impact
Based on truck miles driven for hauling CCR and soil.
Noise impact due to on -site activity
Based on proximity of neighbors to specific on -site work areas.
View impact
Based on final height of storage facility and land uses within viewshed.
Consider stormwater management, geotechnical, and dewatering
Subjective and relative comparison to other options
3of3

Environmental Groundwater Sub -scoring Worksheet
Closure Options Evaluation
Duke Energy
Rev. 1 /15/19
Station/Plant Name: Roxboro Steam Electric Plant
Evaluation Criteria:
Criteria 1. Modeled Plume Intersecting Surface Watei
Score
Modeled plume' does not intersect surface waters after 10 years
10
Modeled plume' does not intersect surface waters after 100 years
5
Modeled plume' does not intersect surface waters after 200 years
0
(Option 1)
(Option 2)
(Option 4)
(Option 5)
Closure by Removal
Closure by Removal
Close -in -Place Hybrid
Closure in Place
(on -site new landfill)
(off -site disposal)
Criteria 1 Score
10
10
10
10
Criteria 2. Groundwater Impact Beyond the current 2 Compliance Boundary
Score
Modeled plume' is within current compliance boundary after 10 years
10
Modeled plume' is within current compliance boundary after 100 years
5
Modeled plume' is within current compliance boundary after 200 years
0
(Option 1)
(Option 2)
(Option 4)
(Option 5)
Closure by Removal
Closure by Removal
Close -in -Place Hybrid
Closure in Place
(on -site new landfill)
(off -site disposal)
Criteria 2 Score
10
10
10
10
Criteria 3. Modeled Off -site Impact
Score
Modeled plume' does not go off -site
10
Modeled plume' is predicted to remain off -site after 100 years
5
Modeled plume' is predicted to remain off -site after 200 years
0
(Option 1)
(Option 2)
(Option 4)
(Option 5)
Closure by Removal
Closure by Removal
Close -in -Place Hybrid
Closure in Place
(on -site new landfill)
(off -site disposal)
Criteria 3 Score
10
10
10
10
Criteria 4. Relative rank based on visual interpretation of modeled boron plume
Score
Ranked #1 among the three Closure Options based on visual interpretation of modeled boron plume
10
Ranked #2 among the three Closure Options based on visual interpretation of modeled boron plume
5
Ranked #3 among the three Closure Options based on visual interpretation of modeled boron plume
0
(Option 1)
(Option 2)
(Option 4)
(Option 5)
Closure by Removal
Closure by Removal
Close -in -Place Hybrid
Closure in Place
(on -site new landfill)
(off -site disposal)
Criteria 4 Sa..
10
9
5
9
- - . . .. .. - . . .. . . . . - . .. .
. . • oil .
. • . .
. . • .. . .
. . • .
W
.. .. . . .. .. . .
. . . :. .. . . .
.

Environmental Groundwater Sub -scoring Worksheet
Closure Options Evaluation
Duke Energy
Rev. 1 /15/19
(Option 2) (Option 4)
(Option 1)
(Option 5)
Justification Notes
Closure by Removal (on -site new landfill)
Closure by Removal (off -site disposal)
Close -in -Place Hybrid
Closure in Place
Criteria 1. Modeled Plume Intersecting Surface
io
so
so
so
Based on the predictive model for the year 2017, found in the January
Based on the predictive model for the year 2017, found in the January
Based on the predictive model for the year 2017, found in the
Based on the predictive model for the year 2017, found in the January
Water
2019 version of the Preliminary Updated Revised Steam Electric Plant
2019 version of the Preliminary Updated Revised Steam Electric Plant
January 2019 version of the Preliminary Updated Revised Steam
2019 version of the Preliminary Updated Revised Steam Electric Plant
Groundwater Flow and Transport Modeling Report for Roxboro Steam
Groundwater Flow and Transport Modeling Report for Roxboro Steam
Electric Plant Groundwater Flow and Transport Modeling Report for
Groundwater Flow and Transport Modeling Report for Roxboro Steam
Electric Plant, West Ash Basin, simulated boron concentrations for the
Electric Plant, West Ash Basin, West Ash Basin, simulated boron
Roxboro Steam Electric Plant, West Ash Basin, simulated boron
Electric Plant, West Ash Basin, simulated boron concentrations for the
Closure by removal (on -site new landfill) scenario with natural
concentrations for the Closure by Removal (off -site disposal) scenario
concentrations for the Close -in -Place Hybrid scenario with natural
Closure -in -Place scenario with natural attenuation does not show boron
attenuation does not show boron of 4,000 ppb or greater intercepting
with natural attenuation does not show boron of 4,000 ppb or greater
attenuation does not show boron of 4,000 ppb or greater
of 4,000 ppb or greater intercepting surface water bodies.
surface water bodies.
intercepting surface water bodies.
intercepting surface water bodies.
Criteria 2. Groundwater Impact Beyond the
Current Compliance Boundary
Based on the predictive model for the year 2017, found in the January
Based on the predictive model for the year 2017, found in the January
Based on the predictive model for the year 2017, found in the
Based on the predictive model for the year 2017, found in the January
2019 version of the Preliminary Updated Revised Groundwater Flow and
2019 Revised Groundwater Flow and Transport Modeling Report for
January 2019 Revised Groundwater Flow and Transport Modeling
2019 Revised Groundwater Flow and Transport Modeling Report for
Transport Modeling Report for Roxboro Steam Electric Plant, East Ash
Roxboro Steam Electric Plant, West Ash Basin, simulated boron
Report for Roxboro Steam Electric Plant, West Ash Basin, simulated
Roxboro Steam Electric Plant, West Ash Basin, simulated boron
Basin, simulated boron concentrations for the Closure -in -Place scenario
concentrations for the Close -in -Place scenario with natural
boron concentrations for the Close -in -Place Hybrid scenario with
concentrations for the Close -in -Place scenario with natural attenuation
with natural attenuation does not show boron of 4,000 ppb or greater at
attenuation does not show boron of 4,000 ppb or greater at or
natural attenuation does not show boron of 4,000 ppb or greater at
does not show boron of 4,000 ppb or greater at or beyond the current
or beyond the current (2018) compliance boundary.
beyond the current (2018) compliance boundary.
or beyond the current (2018) compliance boundary.
(2018) compliance boundary.
Criteria 3. Modeled Off -site Impact
Based on the predictive model for the year 2017, found in the January
Based on the predictive model for the year 2017, found in the January
Based on the predictive model for the year 2017, found in the
Based on the predictive model for the year 2017, found in the January
2019 Preliminary Updated Revised Groundwater Flow and Transport
2019 Preliminary Updated Revised Groundwater Flow and Transport
January 2019 Preliminary Updated Revised Groundwater Flow and
2019 Preliminary Updated Revised Groundwater Flow and Transport
Modeling Report for Roxboro Steam Electric Plant, West Ash Basin,
Modeling Report for Roxboro Steam Electric Plant, West Ash Basin,
Transport Modeling Report for Roxboro Steam Electric Plant, West
Modeling Report for Roxboro Steam Electric Plant, West Ash Basin,
simulated boron concentrations for the Closure by Removal scenario
simulated boron concentrations for the Close -in -Place scenario with
Ash Basin, simulated boron concentrations for the Close -in -Place
simulated boron concentrations for the Close -in -Place scenario with
with natural attenuation does not show boron of 4,000 ppb or greater
natural attenuation does not show boron of 4,000 ppb or greater off
Hybrid scenario with natural attenuation does not show boron of
natural attenuation does not show boron of 4,000 ppb or greater off of
off of Duke Energy property.
of Duke Energy property.
4,000 ppb or greater off of Duke Energy property.
Duke Energy property.
Criteria 4. Relative rank based on visual
11111F so
interpretation of modeled boron plume
Based on a review of boron concentrations found in the January 2019
Based on a review of boron concentrations found in the January 2019
Based on a review of boron concentrations found in the January 2019
Based on review of the predictive model for the year 2017, found in the
Preliminary Updated Revised Groundwater Flow and Transport Modeling
Preliminary Updated Revised Groundwater Flow and Transport
Preliminary Updated Revised Groundwater Flow and Transport
January 2019 version of the Preliminary Updated Revised Groundwater
Report for Roxboro Steam Electric Plant, this scenario is marginally better
Modeling Report for Roxboro Steam Electric Plant, this scenario is
Modeling Report for Roxboro Steam Electric Plant, this scenario is
Flow and Transport Modeling Report for Roxboro Steam Electric Plant,
than Option 2 (identical except landfills on -site), Option 4 Close in Place
marginally better than Option 2 (identical except landfills on -site),
marginally better than Option 5 Closure -in -Place.
West Ash Basin, this scenario is not marginally better than Option 1/2
Hybrid, and Options 5 Closure -in -place.
Option 4 Close in Place Hybrid, and Options 5 Closure -in -place.
Closure by Removal or Options 4 Close -in -Place Hybrid.
Notes:
1. Based on avaliable data at the time of scoring, the modeled plume considered boron at a concentration of 4,000 ug/I or greater; 4,000 µg/L does not represent a
remediation goal, however this concentration does represent the EPA Tap Water Regional Screening Level (RSL) in resident tapwater for boron.
2. The current compliance boundary, as of 10/9/18, was used for all scenarios for criteria 2.