NC0003468_2018 Dan River Final Excavation Plan_20181204

Dan River Steam Station
Coal Ash Excavation Plan
(7 DUKE
E N E RGY.
2018 Update

Table of Contents
I.
Statement of Purpose...................................................................................................................1
II.
General Facility Description.........................................................................................................2
III.
Project Charter...............................................................................................................................3
IV.
Critical Milestone Dates................................................................................................................5
V.
Erosion and Sediment Control Plan...........................................................................................
6
VI.
Dewatering Plan............................................................................................................................
6
VII.
Location(s) for Removed Ash......................................................................................................7
VIII.
Transportation Plan.......................................................................................................................7
IX.
Environmental and Dam Safety Permitting Plan......................................................................
7
X.
Contracting Strategy...................................................................................................................10
XI.
Environmental, Health, and Safety Plan..................................................................................10
XII.
Communications Plan.................................................................................................................10
XIII.
Glossary........................................................................................................................................11
XIV.
Reference Documents................................................................................................................12
Exhibits
Exhibit A: Excavation Soil Sampling Plan

Statement of Purpose
Duke Energy Carolinas, LLC (Duke Energy or the Company) is required by Part II, Section
3(b) of the Coal Ash Management Act of 2014 (Session Law 2014-122) (Coal Ash Act or
Act) to close, in accordance with Part II, Section 3(c), the coal combustion residuals
(CCR) surface impoundments located at the Dan River Combined Cycle Plant (Dan River
or Plant), National Pollutant Discharge Elimination System (NPDES) Permit No.
NC0003468, in Rockingham County as soon as practicable, but not later than August 1,
2019.
This Coal Ash Excavation Plan (Plan) represents activities to satisfy the requirements
outlined in Part II, Sections 3(b) and 3(c), Subparagraphs 1 and 2 of the Act and the
requests set forth in the North Carolina Department of Environmental Quality's (NCDEQ)
August 13, 2014 letter titled "Request for Coal Ash Excavation Plans for Asheville Steam
Station Electric Generating Plant, Dan River Combined Cycle Station, Riverbend Steam
Station, L.V. Sutton Electric Plant" (NCDEQ Letter). The NCDEQ Letter specifically
requests that the Plan include 1) soil and sediment erosion control measures, 2)
dewatering, and 3) the proposed location(s) of the removed ash. These requirements are
found in this updated Plan.
This is a revision of the Coal Ash Excavation Plan updated December 1, 2017, which
covered the subsequent phase of ash basin excavation activities, including basin
dewatering, site preparation, ash basin preparation, and ash removal from the basins at
Dan River. The Plan has been updated and submitted to NCDEQ annually; however,
due to the anticipated completion of ash basin excavation activities by the applicable
CAMA deadline, no further updates will be made to the Plan.
The Plan covers some of the work required by Part II, Sections 3(b) and 3(c) of the Coal
Ash Act. The Act requires the closure of the ash basins as soon as practicable, but no
later than August 1, 2019. However, the Act contains no requirement for the submittal of
an excavation plan of the kind presented here. Thus, while the formulation, submittal,
and review of this Plan will assist in Duke Energy's work to close the ash basins, its
ultimate approval is an action not specifically required by statutory, regulatory, or other
applicable authority.
The scope of work in excavating the ash basins has been determined by applicable laws,
rules, permits, and approvals that control the activities to be performed under the Plan.
There are several external and internal factors that could potentially affect the precise
scope of the work to be performed under the Plan. As a consequence, neither the
submittal of this Plan nor its acknowledgement by NCDEQ should be taken as requiring
actions different from such applicable requirements. Duke Energy submits this Plan to
NCDEQ based on the understanding that it may be necessary to take actions that deviate
from the Plan in the future, and the Company reserves the right to make such changes.
1: Dan River

General Facility Description
The Dan River Steam Station is located in Rockingham County near Eden, NC. The Plant
operated from 1949 until retirement of the coal-fired units in 2012. Upon retirement of the
coal-fired units, a new 620 MW gas-fired unit began operations.
The Primary Ash Basin was constructed in 1956, with an embankment crest elevation of
523.5 feet mean sea level (msl). In 1968, the basin embankment crests were raised to
elevation 530 feet msl and extended in length approximately 1,200 feet east along the
Dan River. An intermediate dike was constructed in 1976, resulting in two basins, with
the Primary Ash Basin dam crest being raised to elevation 540 feet msl. The east side of
the basin was designated the Secondary Ash Basin. The Primary Ash Basin was
periodically dredged and the material dry -stacked on higher terrain north of the basins
(referred to as dry ash stacks). The dam numbers for the ash basins are (ROCKI-237)
and (ROCKI-238.) The dry ash stacks have been capped with soil.
Duke Energy's Coal Combustion Residuals Removal Verification Procedure (Removal
Verification Procedure) will be used to verify that primary source ash has been removed
from the basin. Subsequent to removal of the ash pursuant to the Removal Verification
Procedure, Duke Energy will implement its Excavation Soil Sampling Plan (ESSP), which
was developed for the purpose of meeting the applicable performance standard.
Although not required under CAMA, in November 2016, NCDEQ sent Coal Combustion
Residuals Surface Impoundment Closure Guidelines for Protection of Groundwater to
Duke Energy instructing the Company to submit the ESSP to NCDEQ as part of the site's
excavation plan. In accordance with this directive, a copy of the ESSP is attached as
Exhibit "A" to this Plan.
Primary Ash Basin
The Primary Ash Basin at Dan River consists of a composite dam made up of local borrow
materials, including silty sands and sandy silts with some clay. Portions of the dam may
have been built on, or contain, ash materials. The eastern face of the embankment is
armored with rock up to elevation 512 feet msl. A rock fill berm was constructed alongside
the river, up to elevation 503 feet msl. An intermediate bench was constructed at
approximate elevation of 530 feet msl. The primary basin has an approximate footprint
of 39 acres with a surface water area of 18 acres. The Primary Ash Basin received sluiced
ash from pipes in the southwest corner and outlets into the Secondary Ash Basin through
a decant structure located near the northeast corner of the Primary Ash Basin. Initially,
the Primary Ash Basin contained approximately 1,215,000 tons of CCR material. In
September 2018, the CCR inventory of the Primary Basin was increased by 552,000 tons
due to quantifying CCR material under vertical expansion embankment soil, incorporating
revised bottom of ash floor grades, and including estimated soil waste.
2: Dan River

Intermediate Dike
(Separates the Primary Ash Basin and the Secondary Ash Basin)
The intermediate dike was constructed in 1976, bisecting the basin into Primary and
Secondary Ash Basins. The dike was constructed on existing ash deposits, with an upper
crest elevation of 540 feet msl adjacent to the Primary Ash Basin and a lower crest
elevation of 530 feet msl adjacent to the Secondary Ash Basin. The dike has a surface
road at the 540 feet msl level. It has a vegetated slope adjacent to the road, which
extends to a 530 feet msl elevation shelf adjacent to the Secondary Ash Basin. A rock
buttress was constructed below the elevation 530 feet msl crest. The width of the
intermediate dike is approximately 100 feet.
aFCliVIlual y r,ali opal,.
The Secondary Ash Basin embankments, including the intermediate dike forming the
southwest boundary, have a crest elevation of 530 feet msl and are constructed of the
same local materials as the Primary Ash Basin. The eastern face of the embankment is
armored with rock up to elevation 512 feet msl. A rock fill berm was constructed alongside
the river, up to elevation 503 feet msl. The basin receives decanted flow from the Primary
Ash Basin in the northwestern corner, and flows exit the basin through a decant structure
near the southeastern corner. Flow from the Secondary Ash Basin is regulated by
NPDES Permit No. NC 0003468. The pool level is controlled by the decant riser using
concrete stop -logs and conveys to the outlet through a 36 -inch diameter reinforced
concrete pipe constructed through the embankment dike. Initially, the Secondary Ash
Basin contained approximately 390,000 tons of CCR material.
Ash Stack
The dry ash stacks are located to the north of the Primary and Secondary Ash Basins.
These ash stacks consist of CCR material dredged from the Primary Ash Basin. Initially,
Ash Stack 1 and Ash Stack 2 contained approximately 950,000 tons and 415,000 tons of
CCR material, respectively. For the purposes of stormwater management, the ash stacks
are located within the ash basin system. Stormwater run-off from the ash stacks is
contained within the ash basin system and flows to the Secondary Ash Basin. The
excavation of all CCR from Ash Stack 1 was completed on July 27, 2017.
11. Project Charter
Dewatering of the ash basins and the removal of ash from the site will be performed in
project phases. As of November 1, 2018, approximately 2.67 million tons of ash have
been excavated. Approximately 1.2 million tons were transported to an off-site landfill.
Approximately 106,560 tons were sent to the Roanoke Cement Company for beneficial
use and the remainder to an on-site landfill. This project has completed Phase I and is
now implementing Phase II.
3: Dan River

The following items in Phase I have been completed or initiated:
1. Developed and installed approved erosion and sediment control measures.
2. Obtained applicable permits for work in Phase I.
3. Completed the work scope and bid event to support ash basin closure.
4. Developed and constructed the infrastructure to remove and transport the
ash.
5. Completed rail load out spur for rail transportation.
6. Began bulk dewatering of the Secondary Ash Basin.
7. Initiated and completed the removal of the first 1 million tons of ash from the
Dan River site.
8. Obtained a Permit to Construct the new on-site landfill on October 27, 2016,
following resolution of the environmental justice review.
9. Commenced construction of an on-site landfill.
10. Completed a plan to reroute and eliminate inflows to the ash basins.
11.Validated production rates to meet project requirements.
12. Planned activities for subsequent phase(s), including development of
option(s) for beneficial use or proposed ash disposal location(s).
The Dan River NPDES wastewater permit was issued and became effective on
December 1, 2016. The removal of bulk free water of the Secondary Basin was
completed when the basin water level was lowered to elevation 515 feet msl in 2016.
Interstitial dewatering commenced in 2018 to support excavation in the Secondary and
Primary Basins and is on-going. All leachate and contact stormwater wastewater
treatment will be performed by the City of Eden's Publicly Owned Treatment Works
(POTW) in accordance with the Industrial User Pre-treatment Permit issued to Duke
Energy by the City of Eden. To provide additional wastewater treatment capability, an
on-site treatment system is being installed, which will send treated water to the discharge
point of Outfall 002. The Secondary Basin riser structure and the pipe leading to Outfall
002 was plugged with grout on September 6, 2018.
The excavation of Ash Stack 1 began on October 13, 2015, following acknowledgement
of this Plan by NCDEQ and the receipt of final permits. Phase I was completed on March
23, 2017. Phase II will include completion of the on-site landfill and excavation of the
basins to the on-site landfill. Construction of an on-site landfill began on October 31,
2016, following receipt of the Landfill Permit -to -Construct by NCDEQ.
In accordance with the project plan, during Phase I, the Company removed ash to an off-
site location while simultaneously developing an on-site landfill, which was needed in
order to meet the closure requirements mandated in the Coal Ash Act. The Company
received a Permit -to -Operate (PTO) for the first landfill cell on May 30, 2017, and promptly
began transporting ash to the on-site landfill. The PTO for the second landfill cell was
4: Dan River

received on October 2, 2017, and the final PTO for the third landfill cell was received on
April 18, 2018.
Project Charter Objectives
Phase II Objectives
1. Submit and obtain any necessary permits for Phase II activities.
2. Continue to dewater the ash basins.
3. Construct, operate, and close cells for the on-site landfill.
4. Excavate and remove the remaining ash from ash basins and ash stacks.
5. Continue evaluating beneficial use opportunities.
6. Gain knowledge and opportunities for program improvement that can be
applied to other Duke Energy projects.
Project Charter Scope
Phase II Scope
1. Submit and obtain applicable permits
2. Complete construction of the on-site landfill (Cells 1 & 2 complete).
3. Receive PTOs for the on-site landfill cells (PTOs received for Cells 1 & 2).
4. Excavate and transport the remaining ash from the Dan River Station to the on-
site landfill or for off-site reuse options.
5. Continue dewatering of the Primary and Secondary Ash Basins.
6. Complete closure activities.
7. Operate and close cells for the on-site landfill.
Critical Milestone Dates
Critical Milestones within the Plan are summarized in the table below.
•
F!F11
•-l�l��ilillill 111111 1111111111111
0A
Submit Excavation Plan to NCDEQ
November 15, 2014
Completed
November 13, 2014
Complete Comprehensive
November 30, 2014
Completed
Engineering Review
November 30, 2014
Excavation Plan acknowledgement
February 17, 2015
Completed
February 2, 2015
Receive Industrial Stormwater
March 18, 2015
Completed
Permit
October 1, 2015
Commence Work — Ash Removal
Final permit approval
Completed
(including ash stack soil overburden)
+ 60 Days
October 13, 2015
Submit Updated Excavation Plan to
November 15, 2015
Completed
NCDEQ
November 13, 2015
Delayed due to NCDEQ
Receive Permit -to -Construct
March 31, 2016
environmental justice
On -Site Landfill
review; completed
October 27, 2016
5: Dan River

Submit Updated Excavation Plan to
December 31, 2016
Completed
NCDEQ
December 21, 2016
Delayed due to NCDEQ
environmental
justice review.
Receive Permit -to -Operate (PTO)
June 30, 2017
Cell 1 PTO received
On -Site Landfill
May 30, 2017.
Cell 2 PTO received
October 2, 2017.
Cell 3 PTO received
April 18, 2018.
Submit Updated Excavation Plan to
December 31, 2017
Completed
NCDEQ
December 1, 2017
Eliminate stormwater discharge into
December 31, 2018
Completed
impoundments
June 28, 2018
Impoundments closed pursuant to
Part II, Sections 3(b) and 3(c) of the
August 1, 2019
On Track
Coal Ash Act
Submit Updated Excavation Plan to
December 31, Annually
On Track
NCDEQ
X/ Erosion and Sediment Control Plan
The Erosion and Sediment Control (E&SC) Plan for the excavation of the Ash Stack and
related site activities have been approved. The approval of this plan by NCDEQ meets
the requirement outlined in the referenced NCDEQ Letter. Modifications from E&SC
plans for subsequent phase(s) will be approved by NCDEQ prior to installation and
initiation of subsequent phase work. The approved contractor will install the E&SC
measures indicated in the plan. All control measures will be maintained throughout the
project in accordance with the E&SC plans. When possible, portions of the E&SC plan
will be closed out at the approval of NCDEQ as areas become stabilized.
VI. Dewatering Plan
The Dan River ash basins are being dewatered to facilitate the removal of ash and to
mitigate risk. Interstitial dewatering of the Primary Ash Basin commenced in March 2018.
Interstitial dewatering of the Secondary Ash Basin commenced in June 2018. Leachate
from the onsite landfill, interstitial waste water, and contact stormwater are being treated
by the City of Eden's Publicly Owned Treatment Works (POTW) in accordance with the
Industrial User Pre-treatment Permit issued to Duke Energy by the City of Eden. In
addition, and to provide additional treatment capacity beyond what the City of Eden could
accommodate, that facility installed an on-site wastewater treatment system in Q3 2018
to treat interstitial wastewater for discharge to Outfall 002 in compliance with the facility's
NPDES Wastewater Permit.
6: Dan River

Location(s) for Removed Ash
Ash removed from the site will be transported by the contractor to permitted facilities. The
ash disposal location(s) will be managed and maintained to ensure environmental
compliance with all applicable rules and regulations.
Disposal Sites
The Maplewood Landfill and the on-site landfill at Dan River have been identified as the
primary disposal locations.
Maplewood Landfill
The Maple Landfill is located near Jetersville, VA and is where 1.2 million tons of ash
where shipped by rail during Phase I. The final rail shipment of ash to the Maplewood
Landfill from Dan River occurred on March 23, 2017.
Dan River On-site Landfill
Transportation of ash to the on-site landfill began on May 31, 2017. The project team
utilized lessons learned from Phase I in developing and constructing the on-site landfill,
which provides the improvements below:
• Provide a reliable, long-term, cost-effective solution for ash designated for
removal
• Support development of a diverse supplier program to drive innovation and
competition
• Establish performance baselines and a system to optimize excavation,
transportation, and disposal of ash
Transportation Plan
Ash is currently being transported from the basins via off-road articulated dump truck to
the on-site landfill. Truck loading operations will be conducted with a crew working
typically 12 hours per day, five to six days per week. Ash transportation to Roanoke
Cement Company for beneficiation is by on -road truck. Transportation off-site will be
conducted by approved transporters and will meet Department of Transportation (DOT)
and other applicable federal, state, and local regulations.
Environmental and Dam Safety Permitting Plan
Excavation of ash creates potential for stormwater impacts. The facility holds an
approved E&SC plan and associated Construction Stormwater Permit approval for ash
stack removal. Also, NCDEQ indicated that an NPDES Industrial Stormwater Permit is
required to excavate ash. The Company has received the NPDES Industrial Stormwater
Permit to support ash removal at the site. Pursuant to the requirements of the NPDES
Industrial Stormwater Permit, a stormwater pollution prevention plan (SPPP)
7: Dan River

incorporating best management practices has been created and is currently being
implemented. Future modifications to the permit/plan will be managed as necessary. On
October 27, 2016, Duke Energy received a modified NPDES Wastewater Permit, which
included provisions for dewatering activities.
The area between Ash Stack 1 and Ash Stack 2 was determined to be a jurisdictional
wetland and an Individual Permit (IP) will be required to remediate this area and complete
stormwater diversion prior to basin closure. Wetlands/stream impacts related to the rail
improvements were managed through the United States Army Corps of Engineers
(ACOE) with particular attention paid to the difference between jurisdictional
wetlands/streams under Section 404 and those arising from Section 401 waters. The
Company received approvals from ACOE and NCDEQ for wetlands/stream impacts
related to the rail. The company received approvals from ACOE and NCDEQ for
wetlands/stream impacts related to stormwater diversion in the fourth quarter of 2017.
Dan River ash is a non -hazardous material.
Subsequent phase(s) will include dewatering and continued excavation and removal of
ash from the Primary and Secondary Ash Basins. Subsequent phase(s) also include the
continued construction of the on-site landfill.
In order to facilitate on-site landfill construction and operation, NCDEQ's Solid Waste
Section issued a Landfill Permit -to -Construct on October 27, 2016. Following
construction of each cell of the on-site landfill, Construction Quality Assurance Reports
were submitted to obtain the corresponding PTO. NCDEQ's Solid Waste Section issued
a Landfill PTO for Cell 1 on May 30, 2017, a Landfill PTO for Cell 2 on October 2, 2017,
and a Landfill PTO for Cell 3 on April 18, 2018.
Dam Decommissioning Plan Sequence `A' was approved by NCDEQ Dam Safety on
February 20, 2018. Dam Decommissions Plan Sequence `B' was approved by NCDEQ
Dam Safety on July 16, 2018. Decommissioning Plan Sequence `C' will be submitted to
NCDEQ Dam Safety no later than Q1 2019. Any impacted wells or piezometers will be
properly abandoned in accordance with NCDEQ requirements. Fugitive dust will be
managed to mitigate impacts to neighboring areas.
Other than the agreement with City of Eden regarding development of the on-site landfill,
there are no additional site-specific or local requirements identified.
Permit Matrih
8: Dan River

MEDIA
PERMIT
RECEIVED DATE (R)
COMMENTS
TARGETD.
NPDES Wastewater
Effective December 1, 2016.
Permit — Major
October 27, 2016 (R)
Modification
City of Eden —
June 3, 2016 (R)
None
Industrial User Permit
Jurisdictional Wetland
and Stream Impacts /
September 14, 2015 (R)
Two stream crossings
404 Permitting and
for rail upgrade
401 WQC
Jurisdictional Wetland
401 Permit
and Stream Impacts /
October 9, 2017 (R)
Area between Ash Stack 1 and
404 Permitting and
404 Permit
Ash Stack 2.
401 WQC
October 24, 2017 (R)
Sequence `A'
Sequence `A' approved
February 20, 2018 (R)
February 20, 2018.
Dam Safety
DecomDmassioning
Sequence `B'
Sequence `B' approved
Request Approval
July 20, 2018 (R)
July 16, 2018.
Sequence `C'
Sequence `C' to be submitted
March 31, 2019 (T)
no later than Q1 2019.
Site Suitability Report
August 28, 2015 (R)
None
Target Date was March 31,
Permit -to -Construct
October 27, 2016 (R)
2016. Delay was due to
Landfill
NCDEQ's environmental
justice review.
Waste
Cell 1
May 30, 2017 (R)
Cell 1: Target Date was
Permit -to -Operate
Cell 2
March 31, 2017. Delay was
Landfill
October 2, 2017 (R)
due to NCDEQ's
environmental justice review.
Cell 3
April 18, 2018 R
Site -Specific
Eden City Council adopted
Other
Nuisance/Noise/Odor/
zoning amendment on July 21,
Requirements
Other Requirements,
July 21, 2015 (R)
2015, which allows
including DOT
construction of Dan River
on-site landfill.
9: Dan River

X. Contracting Strategy
The Ash Management Program strategy is to engage multiple contractors, drive
competition, create system -wide innovation, and develop a collection of best practices.
Duke Energy has engaged contractor(s), who are experienced in coal ash excavation,
transportation, and disposal, and continues to evaluate other potential contractors. The
Company provides in-depth oversight, coordination, and monitoring of the contractors to
ensure the work is performed appropriately. Duke Energy's core values include safety,
quality, and protection of the environment, which are incorporated into our contracts. The
Company continues to evaluate alternate approaches, methods, and contracting
solutions and will adjust its strategy, as necessary.
In October 2018, the CCP Project Team decided to change the ash excavation contractor
at Dan River due to concerns with excavation performance. With the contractor change
and the additional discovered ash, the projected completion of ash excavation at Dan
River is now targeted for June 1, 2019.
XI. Environmental, Health, and Safety Plan
The Company is committed to the health, safety, and welfare of employees, contractors,
and the public, and to protecting the environment and natural resources. During all
phases of the project work, the Company and its contractors will follow the Duke Energy
Safe Work Practices Manual, the Environmental, Health, and Safety supplement
document, and any additional requirements. Occupational health and safety expectations
include oversight and continuous improvement throughout the project.
The project includes comprehensive environmental, health, and safety plans
encompassing all aspects of the project work. In addition to adhering to all applicable
environmental, health, and safety rules and regulations, Duke Energy and its contractors
will focus on ensuring the safety of the public and protection of the environment during
each phase of the project.
XII. Communications Plan
The project team has coordinated with Duke Energy's Corporate Communications
Department to develop a comprehensive external communications plan tailored to the
specific needs of each phase of the project. Many different external stakeholders,
including neighbors, government officials, and media have an interest in this project. The
Company is committed to providing information by proactively communicating about the
project activities to potentially affected parties and responding to inquiries in a timely
manner.
10: Dan River

XIII. Glossary
11: Dan River
I&M WO
7W
Synonymous with Coal Combustion Residual Impoundment. A
topographic depression, excavation, or dammed area that is primarily
formed from earthen materials; without a base liner approved for use by
Article 9 of Chapter 130A of the North Carolina General Statutes or rules
Ash Basin
adopted thereunder for a combustion products landfill or coal combustion
residuals landfill, industrial landfill, or municipal solid waste landfill; and
an Area that is designed to hold accumulated coal combustion residuals
in the form of liquid wastes, wastes containing free liquids, or sludge, and
that is not backfilled or otherwise covered during periods of deposition.
Ash Stack
Ash storage areas located north of the Primary and Secondary Ash
Basins.
Projects promoting public health and environmental protection, offering
Beneficial Use
equivalent success relative to other alternatives, and preserving natural
resources.
The agglomerated, angular ash particles formed in pulverized coal
Bottom Ash
furnaces that are too large to be carried in the flue gases and collect on
the furnace walls. Bottom ash falls through open grates to an ash hopper
at the bottom of the furnace.
Bulk Water
Water above the ash contained in the ash basin. Synonymous with free
water.
Coal Ash
Plan required by NCDEQ letter dated August 13, 2014, including a
Excavation Plan
schedule for soil and sediment erosion control measures, dewatering,
and the proposed location of the removed ash.
Coal Ash
Management Act
North Carolina Session Law 2014-122.
of 2014
Coal Combustion
Residuals, including fly ash, bottom ash, boiler slag, mill rejects, and flue
Residuals (CCR)
gas desulfurization residue produced by a coal-fired generating unit.
Dewatering
The act of removing bulk and entrapped water from the ash basin.
Dewatering Plan
Engineered plan and the associated process steps necessary to dewater
an ash basin.
Duke Energy
Safe Work
Document detailing the Duke Energy safety guidelines.
Practices Manual
11: Dan River

TERM
DEFINITION
Flowable water below the ash surface that creates hydrostatic pressure
Entrapped Water
August 13, 2014
on the dam.
Tasks and work performed related to the planning, engineering, and
Excavation Activities
excavation of ash from an ash basin.
Excavation Plan
Refer to Coal Ash Excavation Plan.
July 20, 2016
Water above the ash contained in the ash basin. Synonymous with bulk
Free Water
water.
Very fine, powdery material, composed mostly of silica with nearly all
particles spherical in shape, which is a product of burning finely ground
Fly Ash
coal in a boiler to produce electricity and is removed from the plant
exhaust gases by air emission control devices.
NPDES
National Pollutant Discharge Elimination System.
NPDES Permit
A permit that regulates the direct discharge of wastewater and/or
stormwater to surface waters.
Permit
Federal, state, county, or local government authorizing document.
POTW
Publicly Owned Treatment Works is typically a municipal water treatment
facility that can be utilized to treat wastewater and/or leachate.
XIV. Reference Documents
12: Dan River
PF I
1
NCDEQ Letter to Duke Energy, Request for Excavation
August 13, 2014
Plans
2
Coal Ash Management Act of 2014
September 20, 2014
3
NCDEQ Letter from Jeff Poupart, Water Quality Permitting
July 20, 2016
Section Chief, to Duke Energy regarding decant
12: Dan River