20160742 Ver 2_More Info Recevied_20190521

Homewood, Sue
From: Price, Zan (George)
Sent: Tuesday, May 21, 2019 9:05 AM
To: Mitchell, Robert K; Homewood, Sue
Subject: FW: [External] Revised Cedar Cliff Spillway Upgrade Environmental Report and request
for resonsultation
Attachments: Cedar Cliff Environmental Report -Rev 05.17.2019_reduced.pdf
IP issued 12/16
Zan Price, P.E.
Assistant Regional Supervisor — Asheville Regional Office
Water Quality Regional Operations Section
NCDEQ — Division of Water Resources
828 296 4662 office
828 231 9634 mobile
zan.pricea-ncdenr.gov
2090 U.S. Hwy. 70
Swannanoa, N.C. 28711
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Stuart, Alan Witten <[e-mail]>
Sent: Tuesday, May 21, 2019 8:38:50 AM
To: Goudreau, Chris J.; Tompkins, Bryan; Tarver, Fred; Barnett, Kevin
Cc: Kulpa, Sarah (Sarah. Kul [e-mail])
Subject: [External] Revised Cedar Cliff Spillway Upgrade Environmental Report and request for resonsultation
External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
[e-mail]
Good Morning:
As a follow-up to discussions with some of you and voicemails left with others, Duke Energy is having to replace the
transformer at Cedar Cliff Development of the East Fork Hydroelectric Project to ensure project reliability during the
spillway upgrade. This transformer replacement will require an extension to complete the entire construction project from
17 to 25 months. As a result of the change in scope, the FERC has requested we reconsult with you folks and for Duke
Energy to reile the record of consultation with them for continued processing of our request.
Attached for your review and comment, please find a revised Environmental Report to FERC for the upcoming scheduled
auxiliary spillway upgrade, including transformer replacement, at the Cedar Cliff. As before, the report summarizes
consultation, permits and approvals to date for this project and is intended to facilitate FERC environmental staff's review
of the proposed modifications to the Cedar Cliff Development, as well as Duke Energy's request for approval for a
temporary license variance for the Cedar Cliff Lake drawdown scheduled for 2019-2021. Also included in the revised
Environmental Report are some design revisions to the Cedar Cliff access area boat ramp/construction road as part of an
amended 404 permit request to the Army Corps of Engineers. Most of the Environmental Report is generally unchanged
from the version you previously reviewed and provided consultation on. The revised report does incorporate prior

comments provided by your agencies along with new information relevant to the transformer replacement and scheduling
changes.
Duke Energy plans to file the Environmental Report with FERC in early summer and respectfully requests submittal of any
comments on the enclosed within 30 days of the date of this transmittal. If you can provide your review of the attached
information sooner than 30 -days we would most grateful. Due to the large file size of the attachment (16 MB), please reply
to confirm you received this email and the attachment. Should you have any questions or need any additional information
please let us know.
We greatly appreciate your time and patience in our reconsultation with you on the Cedar Cliff Project.
Regards,
Alan
Alan W. Stuart
Senior Project Manager
Duke Energy Carolinas, LLC
Water Strategy and Hydro Licensing
526 S. Church Street, - EC12Y I Charlotte, NC 28202
Office 980-373-2079 1 Cell 803-640-8765

4
Environmental Report
Cedar Cliff Auxiliary Spillway Upgrade
East Fork Hydroelectric Project
FERC No. 2698
Prepared for Duke Energy Carolinas, LLC
Prepared by HDR
September 2018
Revised May 2019
�' DUKE `�

Environmental Report
Cedar Cliff Auxiliary Spillway Upgrade
Contents
1 Introduction..........................................................................................................................................
1
2 Project Description..............................................................................................................................
2
2.1 Existing Project Structures........................................................................................................
2
2.2 Existing Project Operation.........................................................................................................
3
2.3 Additional Licensed Project Facilities........................................................................................4
3 Purpose and Description of Proposed Work.......................................................................................
5
3.1 Purpose of Proposed Work.......................................................................................................
5
3.2 Description of Proposed Work..................................................................................................
6
3.3 Schedule of Proposed Work.....................................................................................................
9
4 Regulatory Permits and Associated Consultation...............................................................................9
5 Environmental Resources.................................................................................................................
11
5.1 Geological and Soil Resources...............................................................................................
11
5.1.1 Affected Environment.................................................................................................
11
5.1.2 Potential Environmental Effects.................................................................................
12
5.1.3 Proposed Mitigation Measures...................................................................................
12
5.2 Water Quality and Quantity.....................................................................................................
13
5.2.1 Affected Environment.................................................................................................
13
5.2.2 Potential Environmental Effects.................................................................................
14
5.2.3 Proposed Mitigation Measures...................................................................................
16
5.3 Fisheries and Aquatic Resources...........................................................................................
17
5.3.1 Affected Environment.................................................................................................
17
5.3.2 Potential Environmental Effects.................................................................................
17
5.3.3 Proposed Mitigation Measures...................................................................................
18
5.4 Wetlands and Riparian Communities......................................................................................
18
5.4.1 Affected Environment.................................................................................................
18
5.4.2 Potential Environmental Effects.................................................................................
19
5.4.3 Proposed Mitigation Measures...................................................................................
19
5.5 Terrestrial and Wildlife Resources..........................................................................................
20
5.5.1 Affected Environment.................................................................................................20
5.5.2 Potential Environmental Effects.................................................................................
21
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5.5.3 Proposed Mitigation Measures........
5.6 Threatened and Endangered Species .........
5.6.1 Affected Environment ......................
5.6.2 Potential Environmental Effects ......
5.6.3 Proposed Mitigation Measures........
5.7 Historic and Archaeological Resources .......
5.7.1 Affected Environment ......................
5.7.2 Potential Environmental Effects ......
5.7.3 Proposed Mitigation Measures........
5.8 Recreation Resources and Land Use ..........
5.8.1 Affected Environment ......................
5.8.2 Potential Environmental Effects ......
5.8.3 Proposed Mitigation Measures........
Consideration of License Requirements ................
6.1 License Articles ............................................
6.2 U.S. Forest Service 4(e) Conditions .............
References.............................................................
Environmental Report
Cedar Cliff Auxiliary Spillway Upgrade a
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21
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Tables
Table 5-1. Cedar Cliff Lake Characteristics................................................................................................ 14
Table 5-2.Summary of Jurisdictional Waters.............................................................................................. 19
Table 5-3.Impacts to Jurisdictional Waters Summary................................................................................ 19
Table 5-4. Federally Protected Species for Jackson County, North Carolina ............................................ 22
Figure 2-1. Cedar Cliff Development
Figures
Appendices
Appendix A Figures ..................................................
Appendix B Section 404 Permit ...............................
Appendix C Section 401 Water Quality Certification
Appendix D Section 7 Consultation .........................
Appendix E Cedar Cliff Lake Drawdown Plan..........
Appendix F Water Quality Monitoring Plan .............
Appendix G Environmental Report Consultation .....
3
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Acronyms and Abbreviations
ARO........................................................................................................... FERC Atlanta Regional Office
AMSL........................................................................................................................ above mean sea level
BMP...............................................................................................................best management practices
°C................................................................................................................................. degrees Celsius
cfs.........................................................................................................................cubic feet per second
CWA.................................................................................................................................Clean Water Act
cy.........................................................................................................................................cubic yards
Duke Energy..................................................................................................... Duke Energy Carolinas, LLC
EBCI....................................................................................................Eastern Band of Cherokee Indians
ESC...........................................................................................................Erosion and Sediment Control
FERC........................................................................................... Federal Energy Regulatory Commission
ft.............................................................................................................................................. foot/feet
HPMEP.......................................................................... Hydro Project Maintenance & Emergency Protocol
HPMP............................................................................................... Historic Properties Management Plan
IDF............................................................................................................................. inflow design flood
NCDWR .........................North Carolina Department of Environmental Quality Division of Water Resources
NCNHP..........................................................................................North Carolina Natural Heritage Program
NCSHPO........................................................................... North Carolina State Historic Preservation Office
NCWRC................................................................................North Carolina Wildlife Resources Commission
NRHP.................................................................................................. National Register of Historic Places
NWI................................................................................................USFWS National Wetlands Inventory
PFMA.......................................................................................................... potential failure mode analysis
PMF................................................................................................................... probable maximum flood
Project......................................................................................................... East Fork Hydroelectric Project
RM............................................................................................................................................ river mile
TFFm.....................................................................................................................Tallulah Falls Formation
THPO..................................................................................................... Tribal Historic Preservation Office
SMP............................................................................................................. Shoreline Management Plan
USACE...........................................................................................................U.S. Army Corps of Engineers
USFWS........................................................................................................... U.S. Fish and Wildlife Service
WQC................................................................................................................. Water Quality Certification
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1 Introduction
The East Fork Hydroelectric Project (Project) is owned and operated by Duke Energy Carolinas, LLC
(Duke Energy) under a new license issued by the Federal Energy Regulatory Commission (FERC)
on May 4, 2011. The Project consists of three hydroelectric developments located on the East Fork
of the Tuckasegee River with a total installed capacity of 24.280 megawatts. From upstream to
downstream, the three developments are the Tennessee Creek Development (includes the Wolf
Creek Dam and the Tanasee Creek Dam), the Bear Creek Development, and the Cedar Cliff
Development (Appendix A, Figure 1).
The Cedar Cliff Dam (NATDAM NC00334), which is part of the Cedar Cliff Development, is located
on the East Fork of the Tuckasegee River near river mile (RM) 52.1 in Jackson County, North
Carolina. Via letter dated April 24, 2014, the FERC Atlanta Regional Office (ARO) required that Duke
Energy satisfy safe passage of the Inflow Design Flood (IDF), which is defined as the Probable
Maximum Flood (PMF), without overtopping Cedar Cliff Dam. The proposed remedial alternative to
safely pass the PMF involves modifications to the existing auxiliary spillway channel, installation of a
Fusegate system within the auxiliary spillway control section, placement of an approximately 8.5 -foot
(ft) -high concrete parapet wall along the crest of the dam, and other appurtenant components.
Related activities will include new access road construction and modifications to an existing private
access road, construction of a new principal spillway bridge, and construction of an approximately
0.5 -acre laydown area at the upstream approach channel to the auxiliary spillway, as well as
replacement of the existing spillway gate hoist with improved components that provide redundant
wire ropes, drive trains, and motors. The FERC Project boundary will be enlarged by approximately
three acres of Duke Energy -owned land to accommodate modifications to the Project works and
enlargement of the auxiliary spillway channel (Appendix A, Figure 2).
In addition to FERC approval, regulatory authorizations that will be required to carry out the
proposed modifications to the Project include an Individual Permit from the U.S. Army Corps of
Engineers (USACE) and North Carolina Department of Environmental Quality Division of Water
Resources (NCDWR) pursuant to Section 404/401 of the Clean Water Act (CWA) (see Section 4 of
this report). As such, Duke Energy has conducted extensive consultation with resource agencies
regarding the proposed construction activities, and the issued authorizations include measures for
resource protection and mitigation of unavoidable impacts.
Duke Energy has prepared this Environmental Report to facilitate the FERC staff's review of
environmental effects associated with Duke Energy's plans for the auxiliary spillway modifications
and compliance with requirements of the existing FERC license for the Cedar Cliff Development
throughout the construction period.
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2 Project Description
2.1 Existing Project Structures
The Cedar Cliff Development is located on the East Fork of the Tuckasegee River in Jackson
County, North Carolina, approximately six miles southeast of the Town of Cullowhee. Project works
are listed in ordering paragraph (13)(2) of the license, as amended by the Order Amending License
and Revising Installed Capacity issued February 21, 2012. A brief description of the Cedar Cliff
Development is included in this section. Cedar Cliff Dam is classified as high hazard due to the
potential loss of life and significant downstream property damage that would result from a dam
breach.
Constructed between 1950 and 1952, the Cedar Cliff Development (Figure 2-1) consists of a 590 -ft -
long, 173 -ft -high, earthen impervious core and rockfill embankment with nominal upstream and
downstream slopes of 1.3 horizontal (H):1 vertical (V), and a crest elevation of 2,343.5 ft AMSL'. The
dam impounds Cedar Cliff Lake, which has a surface area of 121 acres and total reservoir volume of
6,200 acre-feet at normal maximum pool and a full pond elevation of 2,330 ft AMSL. The nominal top
of dam elevation is approximately 2,340 ft AMSL and is 25 ft wide. The dam is topped by a concrete
parapet wall along its entire length with variable height from 1.5 ft to 3.7 ft which establishes the
constant crest elevation at 2,343.5 ft AMSL.
The Cedar Cliff spillways include the principal spillway on the right abutment and the auxiliary
spillway located at the left abutment (looking downstream) (see Figure 2-1). The principal spillway
includes a float -controlled 25 -ft by 25 -ft Tainter gate with a sill elevation of 2,305 ft AMSL. The
auxiliary spillway contains two erodible fuse plugs separated by a concrete splitter wall with a total
fuse plug length of 200 ft. The fuse plugs are constructed of crushed stone and sand with a sloping
core of compacted impervious fill. The left fuse plug is 112 ft long with a crest elevation ranging from
2,333 to 2,334 ft AMSL, and the right fuse plug is 88 ft long with a crest elevation ranging from 2,331
to 2,333 ft AMSL. Both spillways include rock cut channels that convey water to the 0.46 -mile -long
Bypassed Reach of the East Fork of the Tuckasegee River located near the downstream toe of the
dam. The auxiliary spillway channel is formed by the rock -cut left abutment of the dam on the right
(looking downstream) and steep variable rock -cut walls ranging from 50 ft to 165 ft high on the left.
Water is conveyed to the Cedar Cliff powerhouses via a tunnel intake opening near the right
upstream toe of the dam. The water conveyance tunnel intake is protected by a 10.2 -ft -wide by 16.4 -
ft -high steel slide gate that is normally in the open position to facilitate hydroelectric generation.
Water is conveyed through a 1,138 -ft -long tunnel with a 12 -ft -diameter concrete -lined section, a 13 -ft
by 15 -ft unlined section, and a 10 -ft -diameter steel -lined section. The tunnel adjoins to an 8 -ft -
diameter steel penstock at the main powerhouse, which contains one vertical Francis -type turbine
with a nameplate -rated capacity of 8,187 horsepower at best gate efficiency position, 168.5 ft of net
' All elevations presented in this report are based on the National Geodetic Vertical Datum (NGVD) 29
and are expressed as feet above mean sea level (ft AMSL).
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head and a discharge capacity of 555 cubic feet per second (cfs), connected to a generator rated at
6,375 kW at 0.85 power factor. The water conveyance system is the only low-level outlet for the
reservoir.
Construction of a new minimum flow powerhouse adjacent to the existing powerhouse was
completed in January 2013. The new powerhouse contains a generating unit consisting of a
turbine, generator, governor and associated high-pressure hydraulic system, control panel
boards, generator protection relays, and metal -clad switchgear. The continuous minimum flow
turbine has a nameplate -rated capacity of 526 horsepower based on 35 cfs and 154.5 -ft net
head and is connected to a generator rated at 405 kW at 0.9 power factor. Water inflow to the
continuous minimum flow unit is conveyed from the 8 -ft diameter steel penstock serving the
main powerhouse generating unit.
Vehicular and equipment access to the right abutment of the dam is via the Upper Access
Road, which traverses the crest of the dam. Access to the base of the auxiliary spillway
channel is by an existing lower access road, and the Shook Cove Access Road provides
access to the left abutment area (Appendix A, Figure 2).
14
Dam
Figure 2-1. Cedar Cliff Development
2.2 Existing Project Operation
t K'
The developments of the Project are operated in accordance with seasonal water availability and
licensed/normal operating ranges for lake levels. The Cedar Cliff Development maintains continuous
minimum flow release to the East Fork of the Tuckasegee River, and generation is scheduled in
coordination with the other developments of the East Fork Project, as well as the West Fork Project
(FERC Project No. 2686), to provide seasonal recreation flows in the vicinity of the Dillsboro section
of the (main stem) Tuckasegee River. During periods of high Development/Project inflow, the
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I.
r'.
The developments of the Project are operated in accordance with seasonal water availability and
licensed/normal operating ranges for lake levels. The Cedar Cliff Development maintains continuous
minimum flow release to the East Fork of the Tuckasegee River, and generation is scheduled in
coordination with the other developments of the East Fork Project, as well as the West Fork Project
(FERC Project No. 2686), to provide seasonal recreation flows in the vicinity of the Dillsboro section
of the (main stem) Tuckasegee River. During periods of high Development/Project inflow, the
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individual powerhouses are operated at maximum load to regulate reservoir levels within prescribed
normal limits. When Development/Project inflow exceeds the discharge capacity of the respective
powerhouses, then spillway gate operations will commence to regulate reservoir levels at or below
the respective normal maximum reservoir levels. In general, during periods of normal inflow, the
powerhouses will generate for a prescribed number of hours per day to support electric customer
needs and the downstream flow needs in the main stem of the Tuckasegee River, typically during
different periods each day. Continuous minimum flows are provided in the Wolf Creek Bypassed
Reach and at the Cedar Cliff powerhouse. Tainter gate releases are made, if necessary, to maintain
lake levels below prescribed maximum levels. During low inflow periods upon implementation of the
Low Inflow Protocol (LIP), generation is reduced on a weekly basis, along with corresponding weekly
reductions in bypass flows, Tainter gate releases for recreation (as applicable) and minimum
reservoir levels. The LIP is included in Appendix A of the FERC License for the East Fork Project.
The Cedar Cliff Development is operated to maintain a fairly constant target reservoir elevation of
2,328 ft AMSL throughout the year and to provide the required minimum flow from the Cedar Cliff
powerhouse, which, in turn, provides continuous flow in the two miles of stream between the Cedar
Cliff powerhouse and the confluence with the West Fork of the Tuckasegee River. The Cedar Cliff
Development is also operated to release water for recreational purposes during the recreation
season.
During normal Project operation, water is released from the upstream Bear Creek powerhouse,
located on the East Fork of the Tuckasegee River near RM 54.5, to Cedar Cliff Lake. The normal
reservoir target elevations for the Bear Creek Development are designed to provide some storage
for the historically wet period that occurs in the spring. Normally the Bear Creek powerhouse is
operated to support system peak loads and to refill Cedar Cliff Lake for off-peak generation and
water releases.
At a normal reservoir elevation of 2,330 ft AMSL, the discharge capacity of the Cedar Cliff principal
spillway is approximately 9,900 cfs. The combined discharge capacity of the principal spillway and
auxiliary spillway at reservoir elevation 2,343.5 ft AMSL (top of parapet) is approximately 80,000 cfs.
2.3 Additional Licensed Project Facilities
The FERC Project boundary around the Cedar Cliff Development encompasses two formal public
recreation sites, the Cedar Cliff Access Area, and the Shook Cove Access Area. The 1.86 -acre
Cedar Cliff Access Area is located on Cedar Cliff Lake, at 3387 Shook Cove Road, Tuckasegee, NC
28783 and includes a boat ramp, pier, portable toilet, and parking. The operations and maintenance
of this site are provided by the North Carolina Wildlife Resources Commission (NCWRC) through an
agreement with Duke Energy. The 8.35 -acre Shook Cove Access Area, which is leased by Duke
Energy to Jackson County and maintained by Jackson County, is located downstream of the Cedar
Cliff powerhouses. This site includes accessible parking, a boat ramp, canoe/kayak laydown area,
and trash receptacles, as well as a downstream boat take-out area. The locations of the recreation
sites are shown on Exhibit G-2, which is included as Figure 3 in Appendix A, for reference.
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3 Purpose and Description of Proposed Work
3.1 Purpose of Proposed Work
The purpose of the proposed upgrade project is to modify the existing Cedar Cliff Dam auxiliary
spillway as a remedial alternative to safely pass the IDF. As noted above, the Cedar Cliff
Development has an existing discharge capacity of approximately 80,000 cfs at reservoir elevation
2,343.5 ft AMSL. This discharge capacity represents combined discharge from the main generating
unit, principal spillway (Tainter gate), and auxiliary spillway (fuse plugs). The PMF peak outflow,
which was approved by the FERC on June 22, 1994, is approximately 192,000 cfs. Based on
engineering evaluations, the spillway discharge capacity would need to be increased by at least
112,000 cfs to prevent overtopping of Cedar Cliff Dam. In correspondence to Duke Energy dated
April 24, 2014, the FERC identified the OF as the PMF, citing downstream potential hazards, and
requested a plan and schedule that addresses the ability of Cedar Cliff Dam to safely pass all flows
up to and including the IDF. Due to the existing Cedar Cliff site terrain, limited viable options are
available to increase spillway discharge capacity to this magnitude.
The elements and design of the proposed auxiliary spillway upgrade reflect evaluation of numerous
alternative scenarios developed by a Core Team of FERC, Duke Energy, and HDR representatives
from 2014 through 2017. Based on discussions from the August 2015 meeting, the Core Team's
preferred alternative scenario involves modifications to the existing auxiliary spillway channel. This
option was selected as the most viable alternative in safely discharging the Cedar Cliff OF without
overtopping based on technical merits, including developing a practical engineered solution,
constructability, and maintenance. By letter to Duke Energy dated May 17, 2016, the FERC ARO
provided concurrence with Duke Energy's plans.
The following list summarizes major milestones for the auxiliary spillway upgrade project:
• FERC issued acceptance of Fusegate Alternative for Spillway Remediation in May 2016.
• 404/401 Permit applications submitted and approved in March 2017 and December 2016,
respectively. Request for amended 404/401 Permit submitted to USACE and NCDWR on
May 16, 2019.
• Subsurface Drilling Program initiated in August 2016.
• Engineering Design -Potential Failure Mode Analysis (PFMA) meeting conducted with FERC
in January 2017.
• Shook Cove Access Road completed in June 2017.
• Alden Research Laboratory, Inc. (Alden) completed Phase 1 Physical Scale Model (1:8 and
1:19 scale) testing in June 2017.
• Geological and Geotechnical Subsurface Investigation Report submitted to the FERC in June
2017.
• 30 Percent Design Package Submitted to Duke Energy in November 2017.
• Rock Spoil Evaluation Report completed in January 2017.
• FERC acceptance of PFMA, preliminary hydraulic design, and subsurface investigation
reports in January 2018.
• Alden completed Phase 2 and Phase 3 1:19 scale model testing in March 2018.
• Fifth Core Team meeting conducted in August 2018.
• Final hydraulic design report submitted to the FERC in February 2019.
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• Submittal of engineering design package to the FERC completed March 18, 2019.
• FERC review and acceptance of engineering design package anticipated during third quarter
2019.
• Initiation of long-term reservoir drawdown and redundant spillway gate hoist replacement
scheduled to begin in September 2019.
• Auxiliary spillway upgrade construction project scheduled to commence during fourth quarter
of 2019.
3.2 Description of Proposed Work
The proposed work includes modifications to the existing auxiliary spillway channel, replacement of
the existing parapet wall with an approximately 8.5 -ft -high new PMF wall along the crest of the dam,
and installation of a Fusegate system within the auxiliary spillway control section (Appendix A,
Figure 2).
Cedar Cliff Lake will be drawn down approximately 30 ft to facilitate construction activities for the
proposed work, including spillway gate hoist replacement, spillway gate maintenance, powerhouse
transformer replacement2, and auxiliary spillway modifications. The principal spillway Tainter gate
(sill elevation 2,305 ft AMSL) will be left in a partially open position to facilitate the passage of Cedar
Cliff Development inflow exceeding approximately 590 cfs (Le, the combined maximum hydraulic
capacity of the Cedar Cliff powerhouses).
The existing auxiliary spillway control section (two fuse plugs and a single concrete splitter wall) will
be removed. Approximately 600 ft of the auxiliary spillway channel length will be modified (variable
width and depth increased) through rock excavation (rock splitting and controlled rock blasting).
Sufficient rock excavation and foundation preparation will occur at the existing fuse plug control
section to lower the sill elevation from 2,315 ft AMSL to 2,305 ft AMSL. The existing auxiliary
spillway channel control section will be widened from 200 ft to 250 ft. The existing average auxiliary
spillway channel width will be increased from approximately 95 ft to 145 ft. The existing channel
bottom will be lowered 15 ft, on average. The rock -cut height of the left (looking downstream)
channel wall will be increased from an average of 127 ft (160 ft maximum) to an average of 162 ft
(220 ft maximum), based on the existing topography and proposed rock cut slope of 1:6 (H:V).
Intermediate benches (25 -ft wide) are proposed along the left channel wall to divide the steep rock
cut slopes into 60 -ft to 100 -ft sections (Appendix A, Figure 4). The estimated bulk volume of all
material removed from the auxiliary spillway will be approximately 283,300 cubic yards (cy). In
addition, design consideration is being given to construct a concrete Training Wall along a portion of
the right face of the auxiliary spillway channel. The right side of the existing rock cut face of the
2 Powerhouse transformer replacement relates to the scope for this project and the associated reservoir
drawdown because this maintenance is required to ensure the reliable operation of the powerhouse as
the primary means to pass water through the Cedar Cliff Development throughout the auxiliary spillway
construction period. The Cedar Cliff Development presently has four single-phase step-up transformers,
each rated at 6.6 kV primary / 66 kV secondary and two of which are in service. All four transformers are
being replaced with 3-phase, dry type units, enclosed in a housing, with all work to be conducted within
the general area/footprint of the existing switchyard. The Cedar Cliff powerhouses will remain offline
throughout the transformer replacement process.
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auxiliary spillway channel is the left abutment of the dam and the Training Wall provides additional
protection to the abutment.
The new control section of the auxiliary spillway will be comprised of six Fusegates. Each cast -in-
place Fusegate will be approximately 41.5 -ft wide by 25 -ft high by 24.67 -ft deep and will be located
on a reinforced concrete sill with reinforced concrete abutment wall on the left side and a training
wall on the right side of the spillway. The top of the Fusegate crest will be at normal pool elevation
(2,330 ft AMSL). A single toe block will be located in front of each gate to prevent the Fusegates
from sliding downstream and will serve as a tipping plane during Fusegate activations. The toe
blocks will be constructed of stainless steel. The six Fusegates will serve as a semi -Labyrinth weir
spillway and will not begin to activate until significant inflow events exceed reservoir levels that are
10.5 feet above normal pond elevation 2,330 ft, per engineering design. The first Fusegate will be
activated at reservoir elevation 2,340.5 ft AMSL (Cedar Cliff inflow approximately 79,100 cfs); the
sixth Fusegate will be activated at reservoir elevation 2,345.5 ft AMSL (178,500 cfs)3.The activation
of each Fusegate will be facilitated by the construction of an upstream Inlet Well Tower containing
six individual Fusegate inlet wells. Each Fusegate will be primed by rising reservoir levels within the
Inlet Well Tower based on designed activation water levels while using individual pipes installed in
an excavated trench connecting the individual inlet wells/pipes to their respective Fusegate. Each of
the six Fusegates will be designed for activation based on engineered levels of uplift pressure and
tipping moment correlating to prescribed reservoir water surface levels that adjoin the Inlet Well
Tower.
The existing parapet wall (top -of -wall elevation 2,343.5 ft AMSL) will be removed and replaced with a
PMF wall with a proposed top -of -wall elevation of 2,348.5 ft AMSL. The proposed PMF wall design is
based upon the peak reservoir PMF stage elevation of 2,345.5 ft AMSL with allowance for wave run-
up design criteria. The Cedar Cliff PMF wall will be keyed into the inclined core of the dam.
An approximately 0.5 -acre laydown area for the spoil barge loading zone will be placed at the
upstream end of the rock excavated approach channel (elevation 2,304 ft AMSL) of the auxiliary
spillway. As decided in consultation with natural resource agencies as part of the application process
for the Individual Permit from the USACE and NCDWR pursuant to Section 404/401 of the CWA, all
excavated materials from the auxiliary spillway excavation will be loaded onto a barge and deposited
in Cedar Cliff Lake to eliminate potential impacts to identified adjoining USACE-jurisdictional waters
and intact terrestrial habitats at alternate spoil locations. This activity will result in an approximate
8.1 -acre footprint within the reservoir. The location of the spoil area, shown on Figures 2 and 5a in
Appendix A, is upstream from the dam and plant intake, with the right edge located toward the
original thalweg of the East Fork of the Tuckasegee River channel. The top of the spoil elevation
(2,250 ft AMSL) is approximately 80 feet below full pond elevation. Plan and section views of the
spoil repository are shown on Figures 5a through 5c in Appendix A. The volume capacity of the spoil
repository (approximately 353,600 cy) is in excess of the estimated quantity of all excavated material
to be placed in the reservoir.
3 For perspective, the pre -Cedar Cliff construction flood of record on the East Fork of the Tuckasegee
River was approximately 28,000 cfs on August 30, 1940. The historical flood of record for Cedar Cliff
Dam is approximately 9,000 cfs, which occurred on October 4, 1964.
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To sustain normal generation operation of the Bear Creek powerhouse during the 30 -ft drawdown of
Cedar Cliff Lake, a rock vane was constructed in the immediate tailrace area below the Bear Creek
powerhouse in October 2018. The nominal crest elevation of the overall 121 -foot long rock vane will
be approximately 2328.5 ft AMSL. The nominal height of the rock vane design varies from 2.5 ft to 7
ft with a variable base width of 10 ft to 22 ft. Natural rock material deposited in the Bear Creek
spillway outfall area located approximately 350 ft upstream of the Bear Creek powerhouse was
gathered to construct the rock vane with variable rock diameters of 2 ft to 4 ft. The volume of rock
material required to facilitate rock vane construction is approximately 65 cy. The retention pool
created by the rock vane will provide sustained back pressure against the Bear Creek turbine in
order to sustain generation while minimizing runner cavitation during the extended Cedar Cliff Lake
drawdown period. The rock vane was constructed in October 2018, during the scheduled 10 -ft
drawdown of Cedar Cliff Lake authorized by the Order Approving Temporary Variance of Elevation
Requirements Pursuant to Article 401 issued by FERC on April 24, 2018 and the Individual Section
404 permit issued by USACE (see Section 4 of this report).
Additional construction activities associated with the auxiliary spillway upgrade include the following:
• During the reservoir drawdown, construction of an access road (1951 Access Road)
connection below the full pond elevation 2,330 ft AMSL to connect to the end of the auxiliary
spillway approach channel and remaining 1951-1952 construction road. The new access
road connection will provide a safe corridor at a suitable grade for equipment to travel
between the Shook Cove Access Road and the approach channel to facilitate auxiliary
spillway modifications and Fusegate installations. The proposed 14 -foot -wide 1951 Access
Road below the full pond elevation will extend approximately 548 feet, resulting in 0.22 acre
of open water permanent fill impacts. Construction of the 1951 Access Road will result in a
maximum of approximately 57,000 cy (subject to change and actual quantity likely to be less
than this amount) of excavated material to accommodate a peninsula hillside cut of 2H:1 V.
• Extending Shook Cove Access Road to Inlet Well Tower (considered as upper segment of
the 1951 Access Road).
• Construction of an additional barge access area at the existing Cedar Cliff Access Area,
including an approximately 550 -foot -long temporary access road to the proposed barge
location. The barge access temporary construction road is necessary to maintain access to
Cedar Cliff Lake for equipment and material support for the Project during the reservoir
drawdown period. An approximately 500 -foot long temporary stone construction access road
is proposed below Cedar Cliff Lake normal reservoir elevation of 2,330 ft, terminating at the
2,300 ft msl drawdown elevation for barge access.
• Improvements to existing Upper Access Road, including addition of an eight -inch layer of
compacted aggregate, and realignment of the Upper Access Road at the right abutment and
interface with the access road across Cedar Cliff Dam in association with the new spillway
bridge described below.
• Improvements to existing Lower Access Road, including grading, raising the road bed, and
widening to 12 feet.
• Construction of a new Cedar Cliff Principal Spillway Bridge (construction is underway in
2019). The new bridge will serve as an independent structure, located upstream of the
existing spillway bridge, with the PMF as the design criteria. The bridge will provide
construction access during the auxiliary spillway upgrade project. Following completion of
construction, the bridge will serve as the primary bridge for access to the top of dam,
principal spillway, and right abutment of the auxiliary spillway-Fusegate control section.
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• Spillway gate maintenance and hoist replacement with improved components that provide
redundant wire ropes, drive trains, and motors to occur at the start of the drawdown period in
September 2019.
3.3 Schedule of Proposed Work
Duke Energy anticipates the duration of construction activities at the Cedar Cliff Development for the
auxiliary spillway upgrade will be approximately 25 months, with construction activities expected to
span the period from September 3, 2019 through September 2021, with refill of the reservoir
expected to begin in October 2021.
4 Regulatory Permits and Associated
Consultation
In addition to FERC approval, major regulatory authorizations for the construction of the proposed
modifications to the Project include an Individual Permit from the USACE and NCDWR pursuant to
Section 404/401 of the CWA.
A pre -application meeting was held with Duke Energy and representatives from Jackson County, the
USACE, and the U.S. Fish and Wildlife Service (USFWS) on December 1, 2015 to discuss the
proposed auxiliary spillway upgrade project, associated environmental impacts, and to develop a
collaborative permitting strategy.
An Individual Permit application for the proposed auxiliary spillway upgrade was submitted on July
26, 2016 and supplemented on October 20, 2016 and November 15, 2016. On March 22, 2017, the
USACE issued an Individual Permit pursuant to Section 404 of the CWA for the placement of fill in
waters of the U.S. during the Cedar Cliff Development auxiliary spillway upgrade project. A copy of
the Section 404 permit is provided in Appendix B.
On December 9, 2016, the NCDWR issued an individual CWA Section 401 Water Quality
Certification (WQC) for the construction activities and associated impacts to streams and open
waters during the Cedar Cliff Development auxiliary spillway upgrade project. A copy of the Section
401 WQC is provided in Appendix C.
On May 16, 2019, Duke Energy requested an amendment to the previously approved Section 404
and Section 401 Individual Permit, to incorporate the revised water quality monitoring plan, an
update to the USACE Individual Special Condition 20.0 regarding required depth of Turbidity
Barriers, and request authorization for additional impacts to Cedar Cliff Lake to accommodate the
proposed Cedar Cliff Access Area — Temporary Construction Access Road (Appendix C). An
amended Section 404 and Section 401 Individual Permit is expected to be issued by USACE and
NCDWR, respectively, in the second quarter of 2019.
In addition to the aforementioned pre -application meeting, multiple site visits were conducted by the
USFWS with representatives from Duke Energy and HDR. On August 19, 2016, following Duke
Energy's Individual Permit application to the USACE and NCDWR, the USFWS submitted a report in
accordance with the provisions of the National Environmental Policy Act, Fish and Wildlife
Coordination Act, and Section 7 of the Endangered Species Act. The August 2016 report from
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USFWS included recommended provisions for minimizing potential impacts during construction to
the Northern Long -Eared Bat and Indiana Bat (see Section 5.6) as well as erosion control and
reservoir drawdown. A copy of this correspondence is provided in Appendix D.
Consultation with the North Carolina State Historic Preservation Office (NCSHPO) and Eastern Band
of Cherokee Indians (EBCI) Tribal Historic Preservation Office (THPO) regarding the proposed
construction is required by Section 106 of the National Historic Preservation Act for both the
Individual Permit application to the USACE and pursuant to the Historic Properties Management
Plan (HPMP) for the Project. As provided by the HPMP, in the event of a large, planned, extended
drawdown, the Licensee will consult with the NCSHPO and the EBCI THPO regarding the need to
conduct archaeological surveys of the exposed area. A large, planned, extended drawdown is any
planned drawdown where the pond elevation will remain at least 10 ft below the normal minimum
elevation for a minimum of 30 consecutive days.
Pursuant to the requirements of the HPMP, Duke Energy sent a letter dated August 5, 2016 to the
NCSHPO and EBCI THPO providing notification and description of the planned construction
activities and associated drawdown at the Cedar Cliff Development. No response was received by
Duke Energy from the EBCI THPO. Via letter dated August 30, 2016, the NCSHPO indicated it is
unlikely that any archaeological resources that may be eligible for inclusion in the National Register
of Historic Places (NRHP) would be adversely affected by the planned construction activities and
drawdown. The NCSHPO requested that Duke Energy take photographs to document the current
condition of the dam and its surroundings pursuant to their guidelines. A copy of the August 2016
letter from NCSHPO is provided in Appendix E, Attachment 2. Duke Energy is in the process of
completing the photographic documentation of the Cedar Cliff Dam and its surroundings pursuant to
the NCSHPO's request and guidelines.
On August 7, 2018, HDR, on behalf of Duke Energy, sent a copy of the draft Environmental Report
to the USFWS, NCDWR, and NCWRC for their review and comment within 30 days of receipt. The
USFWS, NCDWR, and NCWRC all responded within 30 days of receipt of the draft report with no
further comments or recommendations. See Appendix G for agency replies and the draft
Environmental Report.
On October 1, 2018, Duke Energy filed the final Environmental Report with FERC, in support of
Duke Energy's request for approval for temporary variance from License Article 401. FERC issued
public notice of Duke Energy's application on November 5, 2018. No comments, motions to
intervene, or protests were in turn filed. Duke Energy updated this Environmental Report in the
spring of 2019 to reflect the final proposed duration for the reservoir drawdown (25 months) in
support of construction and distributed the updated version to USFWS, NCDWR, and NCWRC for
their review and comment within 30 days of receipt. Following agency review, Duke Energy plans to
file the updated Environmental Report and request for approval for temporary variance from License
Article 401 with FERC.
As required by the North Carolina Sedimentation Pollution Control Act and local ordinances, Duke
Energy will also be filing a Land Disturbance permit application with Jackson County and an Erosion
and Sediment Control (ESC) Plan with the North Carolina Department of Environmental Quality for
approval in advance of construction.
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5 Environmental Resources
To facilitate the FERC's Division of Hydropower Administration and Compliance review of
environmental effects of Duke Energy's plans for the Cedar Cliff auxiliary spillway upgrade in
conjunction with review of the final design and construction plans by the FERC's Division of Dam
Safety and Inspections- ARO, resources that may potentially be impacted by the planned
construction activities and proposed protection, mitigation, or enhancement measures are identified
and described below. The information presented in this section was obtained from evaluations
conducted for the relicensing of the Project, as well as desktop evaluations and on-site surveys
performed by qualified resource specialists and agency consultation conducted in support of the joint
USACE/NCDWR permitting process for the auxiliary spillway upgrade.
The FERC issued a new license for the East Fork Hydroelectric Project on May 4, 2011, which
incorporates the conditions of the Section 401 WQC issued by the North Carolina Department of
Environment and Natural Resources, Division of Water Quality (now NCDWR) on July 30, 2010 and
the condition submitted by the USFS pursuant to Section 4(e) of the Federal Power Act4. Potential
effects of the planned construction on license requirements, and the need for temporary variances
from license requirements, are addressed in Section 6 of this document.
5.1 Geological and Soil Resources
5.1.1 Affected Environment
The Project is situated in the Blue Ridge physiographic province, a deeply dissected mountainous
zone that extends northeast -southwest from southern Pennsylvania to central Alabama. The
physiography of Jackson County consists of high, intermediate, and low mountains; floodplains; and
low stream terraces. The East Fork Tuckasegee River is located in the Tuckasegee River
watershed, which generally drains to the north. The Project is surrounded by open water, rural
residential, pastureland, and forested undeveloped lands.
The surficial geology in the region includes late Precambrian to early Paleozoic metasedimentary,
metavolcanic, and igneous rocks from the Tallulah Falls Formation (TFFm) and the Whiteside
Mountain Pluton. Rock types consist of biotite gneiss, garnet-aluminous schist, muscovite -biotite
gneiss, and igneous rocks ranging from quartz diorite to granodiorite. Surficial deposits include
alluvial deposits along the major streams, low and high-level stream terrace deposits, and colluvial
deposits along the mountain slopes. The soils in the area vary from shallow to very deep and are
well -drained to excessively -drained owing to the landscape, which is characterized by rugged,
dissected intermediate mountains, prominent mountain peaks and rock cliffs and moderately broad
ridgetops, wide side slopes, and narrow coves (FERC 2006).
The Cedar Cliff Development is located in the Eastern Tennessee -Western North Carolina seismic
zone, corresponding to the USGS Seismic Zone 2, which is considered a zone of potentially
4Duke Energy Carolinas, LLC, 138 FERC ¶ 62,146
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moderate damage. There are no known active faults in the vicinity of the East Fork Project (FERC,
2006).
5.1.2 Potential Environmental Effects
General construction activities, including modifications to access roads and development of laydown
areas, will disturb geological and soil resources. Such activities will have short-term impacts to
geological and soil resources in the immediate work area.
Planned construction activities include deepening and widening the existing auxiliary spillway
channel and replacing the two existing fuse plugs with a Fusegate system. Approximately 75 percent
of the auxiliary spillway channel length will be modified (variable width and depth increase) through
residual soil and rock excavation (i.e., rock splitting and controlled rock blasting). Additional rock
excavation and foundation preparation will occur at the existing fuse plug control section. In support
of engineering design for the auxiliary spillway upgrade, a geotechnical subsurface investigation was
conducted by HDR for Duke Energy in August -December 2016. The data obtained from the 2016
subsurface investigation was used to develop the foundation design for the planned Fusegate
structure, the design of the rock cuts for the auxiliary spillway channel improvements, as well as to
investigate and determine the potential effort required to excavate the existing rock to widen and
deepen the existing auxiliary spillway channel.
Additional recommendations from the geotechnical investigation have been incorporated into the
design and plans for the auxiliary spillway upgrade, including analysis of scour in the spillway
channel, evaluation of potential acid -production from Iithologies within the TFFm (see Section 5.2.2),
and establishment of design requirements for temporary and permanent rockfall stabilization and
protection measures during construction and for long-term performance of the Fusegate and
auxiliary spillway.
5.1.3 Proposed Mitigation Measures
For the protection of geological and soil resources, as well as water and biological resources during
construction activities and the reservoir drawdown, ESC measures will be implemented and
maintained, as necessary per the requirements of the WQC issued by the NCDWR on December 9,
2016 and to maintain compliance with the state water quality standards, statutes, or rules. As
required by Condition 6 of the WQC, to prevent erosion and sedimentation, Duke Energy will
develop and secure approval of an ESC Plan prior to commencing drawdown of the water level in
the reservoir. (Additionally, prior to construction, a Soil Erosion and Sediment Control Plan will be
submitted to FERC ARO along with other final construction plans and specifications for FERC
approval.) The work area will be inspected daily for signs of erosion or degradation and ESC device
failure. Following construction, all disturbed areas will be restored and re -graded to pre -construction
grades and re -vegetated with native vegetation.
As noted above, results of and recommendations from the geotechnical subsurface investigation
have been incorporated into the final design and plans for the auxiliary spillway upgrade. The
Geological and Geotechnical Subsurface Investigation Report for the Cedar Cliff auxiliary spillway
upgrade was filed by Duke Energy with the FERC ARO on July 14, 2017 and accepted by FERC via
letter to Duke Energy dated January 4, 2018.
In accordance with the Hydro Project Maintenance & Emergency Protocol (HPMEP) for the Project
(Appendix A of the license order), and as required by Condition No. 3 of the WQC issued by
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NCDWR on December 9, 2016, Duke Energy has prepared a Cedar Cliff Lake Drawdown Plan for
the 25 -month drawdown planned for 2019-2021 (Appendix E). The Drawdown Plan describe the
procedures and schedule associated with the Cedar Cliff Lake drawdown and measures to maintain
compliance with the state water quality certification, FERC license and associated plans, and the
Tuckasegee Cooperative Stakeholder Team Settlement Agreement, as applicable. The Drawdown
Plan includes measures for the protection of geological and soil, as well as water, biological, cultural,
and recreation resources.
5.2 Water Quality and Quantity
5.2.1 Affected Environment
The Cedar Cliff Development is part of the Tennessee River system and lies within the Tuckasegee
River watershed (HUC 06010203), which is a subbasin of the Little Tennessee River. The total
drainage area of the Tennessee River is 42,000 square miles, of which the Little Tennessee River
basin contributes 2,627 square miles, including more than 655 square miles from the Tuckasegee
River watershed. The Tuckasegee River flows through the cities of Cullowhee, Sylva, and Bryson
City, North Carolina before it joins the Little Tennessee River almost 50 miles from its headwaters.
The Project reservoirs are surrounded by steep, forested slopes ranging in elevation from 2,250 to
3,800 ft AMSL.
The Tuckasegee River watershed contains some of the most pristine, high-quality waters in the state
of North Carolina and supports numerous trout streams. The East Fork of the Tuckasegee River
(including Cedar Cliff Lake) from Tennessee Creek to the West Fork Tuckasegee River is classified
as a Water Supply III (WS -III), Primary Recreation Class B; Trout Waters surface water, as
designated by the NCDWR.
At full pond elevation 2,330 ft AMSL, Cedar Cliff Lake has a surface area of 121 acres and a total
reservoir volume of 6,200 acre-feet. The reservoir inundates about 2.6 miles of the East Fork
Tuckasegee River and has a total drainage area of 80.7 square miles, including the direct tributaries
to the lake. Average annual inflow to Cedar Cliff Lake is approximately 284 cfs, which is seasonally
variable but regulated by releases from the upstream Bear Creek Development. The reservoir has a
maximum depth of 150 feet, a mean depth of 55 feet, and a mean water retention time of 15.3 days
at full pond elevation. According to the NCDWR, water quality in Cedar Cliff Lake has been
monitored since 1988 and the lake has been characterized as oligotrophic (i.e., very low biological
productivity) since at least that time. Based on water quality sampling conducted by the NCDWR
(data provided to Duke Energy) in Cedar Cliff Lake between 1988 and 2014, water temperature in
the late summer (August to September) months ranged from approximately 10 degrees Celsius (°C)
at lower elevations to approximately 27°C at a depth of 0.5 -ft beneath the surface. The maximum
surface -to -bottom (approximately 100 ft) temperature differential was 19.8°C, and the minimum
surface -to -bottom temperature differential was 4°C.
Additional characteristics of Cedar Cliff Lake, under existing and temporary construction conditions,
are listed in Table 5-1.
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Table 5-1. Cedar Cliff Lake Characteristics
Parameter 001�
Full Pond (Spillway Elevation) 2,330 ft AMSL
Tainter Gate Sill Elevation 2,305 ft AMSL
30 -ft Drawdown Elevation 2,300 ft AMSL
Cedar Cliff Hydro Intake Elevation 2,202 ft AMSL
Proposed Elevation of Top of Spoil 2,250 ft AMSL
Lake Volume below Full Pond A 6,320 acre -ft
Lake Volume below Tainter Gate -�■ 3,742 acre -ft
Lake Volume below 30 -ft Drawdown Epp 3,386 acre -ft
Lake Volume below Hydro Intake 42 acre -ft
Mean Outflow' qq
209.0 cfs
Mean Retention Time (Full Pond)
15.3 days
Mean Retention Time (30 -ft Drawdown)
8.1 days
Max Depth at Dam (Full Pond)
148 ft
Max Depth mid -lake sampling (Full Pond)
106 ft
pH Rangel
5.7-8.0
Mean Alkalinity2
0.13 meq/1
Conductivity Rangel _j 14-20 S/m
Mean Oxygen below 2,250 ft-AMSL2�IN 7.8 mg/I
Minimum Observed Oxygen2 ON
4.2 mg/I
Mean Nitrate2 qN, 0.019 mg/I
Calculated from Cedar Cliff operations (1953-2013)
2 from NCDENR data reported in NP&L (2000)
mg/l=milligrams per liter; meq/l=mill iequivalents of solute per liter; S/m=Siemens per meter
As noted in Section 2, Cedar Cliff Dam creates a 0.46 -mile -long Bypassed Reach from the base of
the dam to the Cedar Cliff powerhouse discharge and back to the East Fork Tuckasegee River. No
continuous minimum flow from the reservoir is provided to the Bypassed Reach.
5.2.2 Potential Environmental Effects
Throughout the construction period, Duke Energy will continue to release minimum flows from Cedar
Cliff Lake to the downstream East Fork Tuckasegee River as required by license Article 404 and
Condition 6 of the 2010 WQC. Potential water quality impacts due to construction of the planned
auxiliary spillway upgrade and associated facilities may result from drawdown of the reservoir,
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physical construction activities that have the potential to cause erosion or sedimentation, and
placement of excavated materials in Cedar Cliff Lake.
As noted above in Section 3.2 and described in detail in the Drawdown Plan included in Appendix E,
Cedar Cliff Lake will be drawn down 30 ft for approximately 25 months to allow for construction of
the auxiliary spillway upgrade. The drawdown would result in a temporary reduction in water quantity
in Cedar Cliff Lake. Additionally, sediment in the drawdown zone has the potential to be subject to
erosion and resuspension. The drawdown and other planned construction activities, including rock
cutting and placement of excavated material in the reservoir, have the potential to result in
temporary and localized increases in turbidity in Cedar Cliff Lake.
Potential water quality impacts associated with the placement of the excavated materials in the
reservoir have been evaluated throughout the engineering design and Section 404/401 permitting
process. Through analysis of the results of geotechnical and geological subsurface investigations
performed at the Cedar Cliff Development in late 2016, pyrite (FeS2) was identified in rock
exposures at the site and in the rock core from boreholes drilled for the subsurface investigation.5
Rocks with greater than 1 percent pyrite and/or pyrrhotite by volume or pyritic sulfur in excess of 0.5
weight percent are considered to be potentially acid -producing (Byerly 1990 and Byerly 1996, in
HDR 2018a). Pyrite can react in the presence of atmospheric oxygen and water to form ferrous
sulfate and sulfuric acid. Although some acid -drainage is produced by natural weathering (Huckabee
et al. 1975), construction activities can expose large volumes of rock containing sulfide minerals to
oxidizing conditions. Subsequent leaching of the oxidation products by rainfall/groundwater result in
the formation of acid -drainage characterized by low pH values, high concentrations of sulfate, and
mobilization of metals such as iron, aluminum, and manganese. A rock spoil evaluation was
conducted for Duke Energy to further characterize the pyritic rocks at the site, specifically with
regard to pyrite crystal size and mineral abundance, and to evaluate the potential impact of the
placement of pyritic rock spoil into Cedar Cliff Lake (HDR 2018b).
Subsequent petrographic analyses of metasedimentary rocks of the TFFm from the rock cores
indicated that the garnet mica schist, mica schist, and schistose biotite gneiss lithologies contained 2
percent to 7 percent pyrite by volume (HDR 2017). Based on boreholes drilled during the geological/
geotechnical site investigation for the auxiliary spillway upgrade, approximately 26 percent of the
total excavated material (73,600 cy) will be made up of these three rock lithologies (HDR 2017).
There are no known instances of acid -drainage related to the metasedimentary rocks of the TFFm in
the region surrounding the site. The results of the rock spoil evaluation demonstrated a low potential
for acid -production due to the coarse-grained pyrite -bearing rocks in the TFFm, based on the
petrographic analysis of samples that have been continuously submerged since the reservoir was
filled; this is consistent with the site's 65 -year history of non -acid -production.
As described in the Water Quality Monitoring Plan (Appendix F), the physical and chemical
properties of Cedar Cliff Lake (Table 5-1) also influence the amount of oxidation production in the
5 Note that the acid -producing potential of certain metasedimentary rocks of the Blue Ridge Province has
been known since the late 1960s. The Cedar Cliff site is underlain by rocks of the TFFm; the major acid -
producing rocks are graphitic schists of the Anakeesta Formation, located west of the Project. There are
no known instances of acid -drainage related to the TFFm that underlie the Project.
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reservoir and downstream reaches. For example, the wide range of pH values reflect the poor
buffering capacity of the low alkalinity water as biological activity metabolized carbon dioxide. In
addition, the low ionic strength, as measured by conductivity, also influences the ability to measure
accurate pH values as well, indicating the poor buffering capacity. The relatively high dissolved
oxygen concentrations in the lake would favor higher rates of pyrite oxidation, but these rates would
be significantly low compared to exposure to atmospheric oxygen. The low nitrate concentrations
would limit the amount of de -nitrification associated with anaerobic nitrate -dependent microbial pyrite
oxidation. Probably the most significant factor limiting the accumulation of pyrite oxidation products
in the lake is the very high flushing rate of the reservoir. The average retention time of the water at
full pool is 15.3 days; at a 30 -ft drawdown the average retention time of the water is reduced to 8.1
days. Also, at the 30 -ft drawdown, the primary means of maintaining the lake level is through
powerhouse operation, which draws water from the bottom of the lake, further reducing the
accumulation of oxidation products in the lake.
5.2.3 Proposed Mitigation Measures
As described above in Section 5.1.3, Duke Energy will develop and secure approval of an ESC Plan
prior to commencing drawdown of the water level in the reservoir. Best Management Practices
(BMPs) in the vicinity of construction activities will also be employed for the protection of water
quality, including but not limited to installing protective silt fencing, restricting the use of wet concrete
within surface waters, and implementing and maintaining a spill prevention plan for heavy
equipment. Following construction, all disturbed areas will be restored and re -graded to pre -
construction grades and re -vegetated with native vegetation.
As described in the Drawdown Plan included in Appendix E, during drawdown and immediately after
the drawdown elevation is reached, inspections will be performed by Duke Energy once per week
and after significant rainfall events (e.g., precipitation estimates for the Project area of 1 inch or
greater within 24 hours), as feasible. Approximately one month after the drawdown is reached and
based on the condition of the exposed lake bottom, inspections will occur at least monthly for the
duration of the drawdown. Inspections will identify mass wasting and sloughing on the banks and
remediation measures will be installed as needed. Remedial measures may include installation of
straw bales along the banks or similar measures to decrease velocity of waters, decrease erosion,
and minimize the amount of sediment released to Cedar Cliff Lake through erosion. Erosion control
materials (i.e., straw bales) will be available onsite in the event such materials need to be rapidly
deployed via barge. Additionally, Cedar Cliff Lake will be lowered and refilled at a rate no greater
than 3 ft per 24 hours.
Pre- and post -construction water quality (i.e., pH) monitoring has been requested by the agencies
(USACE, NCDWR, and NCWRC) to confirm the disposal of the excavated materials in the reservoir
as proposed does not negatively affect water quality within or downstream of the Cedar Cliff
Development. This request was initially made at a February 21, 2018 meeting with NCDWR,
NCWRC, USACE, and USFWS, where Duke Energy presented and discussed the results of its rock
spoil evaluation. To address this request, Duke Energy has developed a monitoring plan for the
auxiliary spillway upgrade to assess any direct changes in water quality of Cedar Cliff Lake or the
downstream reach due to pyrite oxidation. On May 29, 2018, the monitoring plan was provided to
USACE, NCDWR, and NCWRC for concurrence. The final monitoring plan, including
commencement of water quality monitoring in the summer of 2018, is being implemented by Duke
Energy pursuant to the Individual Permit and WQC issued by NCDWR for construction of the
auxiliary spillway upgrade is included in Appendix F.
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5.3 Fisheries and Aquatic Resources
5.3.1 Affected Environment
Because the required minimum flow will be maintained at the Cedar Cliff powerhouse throughout the
construction period, and the construction footprint is primarily limited to the reservoir, dam, and the
area immediately below the dam, the area of interest with respect to effects of construction on
fisheries and aquatic resources includes Cedar Cliff Lake and the upstream extent of the 0.46 -mile -
long Bypassed Reach.
Cedar Cliff Lake is classified by the USFWS National Wetlands Inventory (NWI) as lacustrine,
limnetic, consolidated bottom, permanently flooded, diked/impounded (L1 UBHh). Shoreline habitats
along Cedar Cliff Lake include clay/weathered bedrock, sand/cobble, vegetated/stream confluence,
and woody debris. These habitats provide food and cover for aquatic fauna and critical nursery
areas for juvenile fish.
Cedar Cliff Lake exhibits a wide variety of warmwater and coolwater fish species. Fish survey data
for Cedar Cliff Lake collected in the 1960s and 1996 by the NCWRC identified 18 species, many of
which are game species such as smallmouth and largemouth bass (most common), and rainbow,
brown, and brook trout (FERC 2006). The reservoir is classified by the NCWRC as hatchery
supported trout waters. In 2018, Cedar Cliff Lake was stocked by NCWRC with rainbow trout.
Riverine habitat along the Cedar Cliff Bypassed Reach (East Fork Tuckasegee River downstream
from Cedar Cliff Dam to the powerhouses) includes riffle/run complexes and pools with a variety of
coarse substrate such as sands, cobbles, boulders, and bedrock. Organic aquatic habitats include
leaf packs, woody debris, root masses, and submerged/emergent vegetation. The riparian corridor is
intact and includes large trees and shrubs that provide shade and cover for aquatic organisms. The
Bypassed Reach is typically dry, as there are no substantial direct tributaries to this reach, with the
lowest portion of the Bypassed Reach receiving only 0.5 cfs of cumulative mean flow (FERC 2006).
Due to the primarily dewatered condition, historical sampling has indicated both low diversity and
abundance of the fish community in this reach. As part of the 2002 relicensing studies, Duke Energy
evaluated benthic m acroi nverteb rates at a sampling location on the East Fork approximately 1.5
miles downstream of the Cedar Cliff Dam that received a bioclassification of Good -Fair. A site
reconnaissance of the sampling location revealed no suitable mussel habitat or other evidence of
mussel occurrence.
5.3.2 Potential Environmental Effects
Potential impacts to fisheries and aquatic resources due to construction of the planned auxiliary
spillway upgrade and associated facilities may result from drawdown of the reservoir, physical
construction activities, and placement of excavated materials in Cedar Cliff Lake.
Cedar Cliff Lake will be drawn down 30 ft below the normal full pond elevation for approximately 25
months during construction activities. As water levels recede, aquatic organisms may become
stranded. Habitat within the drawdown zone will be unavailable for fish and other aquatic organisms.
The exposed habitat may undergo minor alteration during drawdown, but will quickly become
reestablished once the reservoir is refilled subsequent to construction activities. Exposed areas
include the upstream extent of Cedar Cliff Lake, which will be dewatered except for periods of power
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generation at Bear Creek (see the drawdown reservoir water surface map included as Attachment 1
of the Drawdown Plan in Appendix E).
Increases in suspended sediment associated with the planned construction could affect the aquatic
resources and may adversely affect aquatic habitat (when and if present) in the Bypassed Reach or
reservoir bottom by filling in pools and coarse substrate (i.e., gravel and cobble) habitats with fine-
grained material. However, any increases in turbidity are expected to be temporary and localized;
therefore, effects are anticipated to be negligible. As described below, increases in turbidity will be
controlled to the greatest extent possible through measures such as the ESC Plan and BMPs.
The placement of excavated materials from the auxiliary spillway excavation in Cedar Cliff Lake is
expected, based on consultation between Duke Energy and NCWRC, to create additional fish
habitat in the reservoir.
5.3.3 Proposed Mitigation Measures
As described in the Drawdown Plan (Appendix E) and Section 5.1.3, above, impacts of the
drawdown on fisheries and aquatic resources will be limited by lowering and refilling the reservoir at
a rate no greater than 3 ft per 24 hours on a continuous basis until the desired lake elevation is
achieved. During the reservoir drawdown process, Duke Energy will perform inspections of the
exposed shoreline areas for the occurrence of erosion or fish stranding in shallow lake areas. If
erosion or fish stranding is observed, Duke Energy will consult with the resource agencies to
determine if a decreased drawdown rate is necessary to reduce the likelihood of erosion or
strandings. Duke Energy has developed and will implement an ESC Plan and BMPs to minimize
impacts to water quality and aquatic resources. Following construction, all disturbed areas will be
restored and re -graded to pre -construction grades and re -vegetated with native vegetation.
5.4 Wetlands and Riparian Communities
5.4.1 Affected Environment
According to the NWI, reaches of the East Fork of the Tuckasegee River are identified as riverine,
upper perennial, rocky shore, temporary flooded (R3RSA) and riverine upper perennial,
unconsolidated bottom, and permanently flooded (R3UBH) (Cowardin et al. 1979). The East Fork
Tuckasegee River reach located within the vicinity of Cedar Cliff Dam is generally 20 to 40 ft wide
with stream bank heights ranging from 4 to10 ft. The riparian buffer is mostly intact with localized
areas of scour and stream bank erosion. The NWI classifies Cedar Cliff Lake as lacustrine, limnetic,
consolidated bottom, permanently flooded, and diked/impounded (L1 UBHh).
In September 2015, in support of the Section 404/401 permit application, Duke Energy contracted
with HDR to survey the work area and adjacent lands for wetlands and jurisdictional waters of the
U.S. under Section 404 of the CWA. The areas were examined according to the methodology
described in the USACE 1987 Wetland Delineation Manual (USAGE 1987), USACE Post-Rapanos
guidance, USACE Eastern Mountains and Piedmont Regional Supplement (USACE 2012), and
NCDWR Methodology for Identification of Intermittent and Perennial Streams and Their Origins
(Version 4.11) (NCDWR 2010).
On-site reconnaissance activities identified the East Fork Bypassed Reach and Cedar Cliff Lake as
jurisdictional waters. During a site visit in December 2015, the USACE verbally confirmed that they
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will not claim federal jurisdiction over aquatic habitats within the auxiliary spillway or the seep
drainage along the toe of the main dam. Table 5-2 provides a summary of jurisdictional waters of the
U.S. within the work area (i.e., boundary depicted on Appendix A, Figure 2).
Table 5-2.Summary of Jurisdictional Waters
35.251261 R3RSA/ * —2,000 linear feet
-83.100550 R3UBH
35.255780 L1 UBHh —121 acres
-83.096929
5.4.2 Potential Environmental Effects
Table 5-3 provides a summary of impacts to USACE jurisdictional waters.
Table 5-3.Impacts to Jurisdictional Waters Summary
Sheet 2
Cedar Cliff
Lake
Sheet 3
Cedar Cliff
Lake
Sheet 3
Cedar Cliff
Lake
Cedar Cliff
Sheet 6
Lake
Temporary Fill 0.5 acres
(Barge Loading Staging Area)
Permanent Fill 9.6 acres
(Spoil) 'm
Temporary 50.8 acres
(Dewatering)
Permanent Fill 0.01 acres
(Submerged Weir)
60.91 acres
As previously noted, Duke Energy has received an Individual Permit pursuant Section 404
(Appendix B) and WQC pursuant to Section 401 (Appendix C) of the Clean Water Act for these
impacts.
5.4.3 Proposed Mitigation Measures
Duke Energy has developed and will implement an ESC Plan and BMPs to minimize impacts to
wetland resources. Following construction, all disturbed areas will be restored and re -graded to pre -
construction grades and re -vegetated with native vegetation.
As required by Condition 6 of the WQC issued by NCDWR in December 2016, and as described
above, Duke Energy will develop and secure approval of an ESC Plan prior to commencing
drawdown of reservoir. ESC measures shall not be installed in wetlands or waters with the exception
of turbidity curtains. All ESC devices shall be removed and the natural grade restored. ESC
practices must be in full compliance with all specifications governing the proper design, installation
and operation and maintenance of such BMPs.
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Additionally, to prevent sedimentation in the upstream reservoirs from traveling into the downstream
reaches, the Individual Section 404 permit requires Duke Energy to employ all ESC measures to
prevent an increase in sedimentation or turbidity within waters/wetlands outside the permit area. This
shall include, but is not limited to, the immediate installation of silt fencing or similar appropriate
devices around all areas subject to soil disturbance or the movement of earthen fill, and the
immediate stabilization of all potentially disturbed areas. Additionally, the Project will remain in full
compliance with the Sedimentation Pollution Control Act of 1973 (North Carolina General Statutes
Chapter 113A Article 4). Prior to any excavated spoil repository work, Duke Energy will require the
contractor to install minimum 5 -foot turbidity barriers with weighted skirts adjoining the repository
work areas that are in or adjacent to surface waters. The turbidity barriers shall stay in place until
work is complete and erodible materials have been stabilized.
5.5 Terrestrial and Wildlife Resources
5.5.1 Affected Environment
In 2015, in support of the proposed auxiliary spillway upgrade and the Section 404/401 permit
application, a botanical survey was conducted by for Duke Energy by HDR within the planned
construction footprint (work area). Based on Classification of the Natural Communities of North
Carolina — Fourth Approximation (Schafale 2012), several natural communities were identified
including Montane Acid Cliff, Acidic Cove Forest, and Rich Cove Forest.
The work area is dominated by hard and mixed hardwood pine forest types. The forested areas are
comprised of mature woody, herbaceous, and vine species including black oak (Quercus veluntina),
northern red oak (Quercus rubra), white oak (Quercus alba), American sycamore (Platanus
occidentalis), American beech (Fagus grandifolia), black walnut (Juglans nigra), black locust
(Robinia pseudoacacia), cucumber tree (Magnolia acuminate), green ash (Fraxinus pennsylvanica),
mockernut hickory (Carya tomentosa), persimmon (Diospyros sp.), tulip poplar (Liriodendron
tulipifera), hemlock (Tsuga canadensis), red maple (Acer rubra), striped maple (Acer
pensylvanicum), white pine (Pinus strobus), yellow birch (Betula alleghaniensis), black cherry
(Prunus serotina), chokecherry (Prunus virginiana), ironwood (Carpinus caroliniana), mountain
doghobble (Leucothoe fontanesiana), mountain laurel (Kalmia latifolia), spicebush (Lindera benzoin),
witchhazel (Hamamelis virginiana), yellowroot (Xanthorhiza simplicissima), bee balm (Monarda sp.),
cardinal flower (Lobelia cardinals), horsetail (Equisetum sp.), goldenrods, jack -in -pulpit (Arisaema
triphyllum), Nepalese browntop (Microstegium vimineum), wingstem (Verbesina alternifolia), ebony
spleenwort (Asplenium platyneuron), southern lady fern (Athyrium filix-femina), sensitive fern
(Onoc/ea sensibilis), catbrier (Smilax sp.), Japanese honeysuckle (Lonicera japonica), muscadine
(Vitis rotundifolia), poison ivy (Toxicodendron radicans), trumpet creeper (Campsis radicans), and
Virginia creeper (Parthenocissus quinquefolia).
Terrestrial communities are comprised of forested lands with a few open habitats that may support a
diverse number of wildlife species. Representative mammal, bird, reptile, and amphibian species
commonly occurring in these habitats are listed below. Note individual species and/or evidence of
species observed during HDR's field survey are indicated with an asterisk (*). Information on species
that typically use these habitats in the Appalachian Oak Forest Region was obtained from relevant
literature, mainly the Biodiversity of the Southeastern United States, Upland Terrestrial Communities
(Martin et al. 1993).
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Mammal species that commonly occur in these habitats include eastern cottontail
(Sylvilagusfloridanus); gray squirrel (Sciurus carolinensis); eastern chipmunk (Tamisstriatus),
southern flying squirrel (Glaucomysvolans), various vole, rat, and mice species; raccoon
(Procyonlotor); Virginia opossum (Didelphisvirginiana); white-tailed deer (Odocoileusvirginiana), and
black bear (Ursus americanus). Bird species that commonly use these habitats include indigo
bunting (Passerine cyanea), prairie warbler (Dendroica discolor), northern cardinal (Cardinalis
cardinalis), field sparrow (Spizella pusilla), rufous -sided towhee (Pipilo erythrophthalmus), red -eyed
vireo (Vireo olivaceous), scarlet tanager (Piranga olivacea), blue jay (Cyanocitta cristata), and
Carolina chickadee (Poecile carolinensis). Predatory birds may include several hawk and owl
species and turkey vulture (Cathartes aura). Reptile and amphibian species that may use this
terrestrial community include copperhead (Agkistrodon contortrix), eastern corn snake (Pantherophis
guttatus), eastern box turtle (Terrapene carolina carolina), eastern fence lizard (Sceloporus
undulatus), five -lined skink (Plestiodon fasciatus), spring peeper (Pseudacris crucifer), timber
rattlesnake (Crotalus horridus), and American bull frog (Rana catesbeiana). The dominant species of
salamander in these habitats are dusky salamanders (Desmognathus spp.).
5.5.2 Potential Environmental Effects
Minimal amounts of terrestrial vegetation will need to be cleared to expand the auxiliary spillway
channel and make other minor improvements to access roads. Improvements to access roads to
better facilitate construction activities will require removal of vegetation and ground disturbances, but
effects will be temporary and localized. Impacts of construction on sensitive species are addressed
in Section 5.6.
5.5.3 Proposed Mitigation Measures
Duke Energy has developed and will implement an ESC Plan and BMPs to minimize impacts to
terrestrial resources. Following construction, all disturbed areas will be restored and re -graded to
pre -construction grades and re -vegetated with native vegetation. Additionally, Duke Energy will cut
trees as needed in a manner that minimizes impacts to federally protected bat species, as discussed
in greater detail in Section 5.6.
5.6 Threatened and Endangered Species
5.6.1 Affected Environment
A list of federally protected species for Jackson County, North Carolina was obtained from the
USFWS website on April 24, 2018. Table 5-4 provides a summary of these species.
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Table 5-4. Federally Protected Species for Jackson County, North Carolina
C/emmys muhlenbergii
Glaucomys sabrinus coloratus
Myotis sodalis
Myotis septentrionalis
Myotis grisescens
Invertebrates
Alasmidonta raveneliana
Spruce -Fir Moss Spider . Microhexura montivagaMicro-
T(S/A) Probable/
Potential
MCurrent
E Current
T Current
E Current
E Current
E
Vascular Plants =�
Curren
M
W�� T Currant
T Current
E Current
E = Endangered. A taxon "in danger of extinction throughout all or a significant portion of its range."
T = Threatened. A taxon "likely to become endangered within the foreseeable future throughout all or a significant
portion of its range."
T(S/A) = Threatened due to similarity of appearance. A taxon that is threatened due to similarity of appearance with
another listed species and is listed for protection. Taxa listed as T(S/A) are not biologically endangered or
threatened and are not subject to Section 7 consultation.
2 Current = The species has been observed in the county within the last 50 years.
Probable/Potential = The species is considered likely to occur in the county based on the proximity of known
records (adjacent counties), the presence of potentially suitable habitat, or both.
An on-site survey to identify potential habitat and possible individuals of federally protected species
known to occur in Jackson County was conducted in preparation for the Section 404/401 permit
application. As part of this effort, HDR consulted the North Carolina Natural Heritage Program
(NCNHP) Element Occurrence database for protected species distribution and proximity to the
Cedar Cliff Development. The NCNHP database revealed no known occurrences of federally
protected species within the work area. The following is a summary of biological conclusions for
species that are protected under provisions of Section 7 and Section 9 of the Endangered Species
Act of 1973.
The site visit revealed no suitable habitat for the bog turtle, Carolina northern flying squirrel,
Appalachian elktoe, spruce -fir moss spider, small -whorled pogonia, swamp pink, or rock gnome
lichen within the work area. Potential roosting habitat for the Indiana bat and northern long-eared bat
was identified along the rock face of the auxiliary spillway and trees along the top of the ridge.
A database search conducted by the USFWS indicated no known northern long-eared bat occupied
hibernacula and maternity roost trees are located within close proximity of the work area. During a
site visit conducted by USFWS, Duke Energy, and HDR representatives on March 23, 2016, the
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USFWS determined that there is suitable habitat for federally protected bat species along the bluff of
the existing auxiliary spillway. USFWS recommended a summer acoustic survey to be conducted to
determine the presence and/or absence of Indiana bat and northern long-eared bat within an
approximate 3 -acre proposed blasting and clearing area required for the auxiliary spillway
modifications.
5.6.2 Potential Environmental Effects
Minimal amounts of terrestrial vegetation will need to be cleared to expand the auxiliary spillway
channel and make other minor improvements to project access roads. Additionally improvements to
access roads to better facilitate construction activities may require removal of vegetation. Vegetation
removal (i.e. tree clearing) could have effects on the Indiana bat and northern long-eared Bat;
however, Duke Energy has consulted with appropriate agencies and will implement protective
measures for the protection of federally listed bat species during the planned construction.
A study plan following the 2016 Rangewide Indiana Bat Summer Survey Guidelines was developed
for Duke Energy and submitted to USFWS for approval on April 25, 2016, as part of the Section
404/401 permit process. A bat acoustic survey was conducted for Duke Energy during the summer
survey window (May 16 to May 18) at two locations for two nights each to determine the presence
and/or probable absence of Indiana bats and northern long-eared bats within the proposed blasting
and clearing area. Bat calls were analyzed using two software programs approved by the USFWS:
BCID and EchoClass. Ten bat species were initially identified by the acoustic analysis programs. A
total of five Indiana bat and eight northern long-eared bat call files were identified. A report detailing
the findings of the bat acoustic survey was submitted electronically to the USFWS on June 13, 2016
(HDR 2016). After reviewing the report, USFWS confirmed that the survey results indicated both
species (Indiana bat and northern long-eared Bat) were present within the work area. Duke Energy
subsequently submitted mitigation measures to minimize adverse impacts. Provided that all of the
mitigation measures are implemented, the USFWS concurred with a "may affect, not likely to
adversely affect" determination for the federally listed bat species.
5.6.3 Proposed Mitigation Measures
Duke Energy proposes to cut trees within the 3 -acre blasting and clearing area from October 15 —
April 15 to avoid impacts to the maternity roosting period for federally protected bat species. The
USFWS will be notified if (unplanned) trees need to be removed during the summer maternity roost
season. In this situation, an experienced biologist will conduct an on-site habitat assessment to
determine if trees to be cleared are suitable roosts (i.e. live trees and/or snags that have exfoliating
bark, cracks, or crevices). If potential roosts are identified, emergence surveys will be conducted at
nighttime, before trees/snags are removed. If emergence surveys indicate federally protected bats
use those trees, the USFWS will be contacted to establish a plan for proceeding prior to tree
removal. Additionally, potential suitable roost trees adjacent to the work area will be marked and
protected during clearing activities.
5.7 Historic and Archaeological Resources
5.7.1 Affected Environment
In association with the 2004 East Fork Project FERC license application, Duke Energy
commissioned a National Register evaluation of Project facilities and an archaeological survey.
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Based on this evaluation, project facilities at the Cedar Cliff Development were determined to be
eligible for the National Register since the development is an element of the larger Nantahala area
hydropower system. In addition, the Project is eligible under the categories of Industry and Military.
In the 1950s, electricity generated by the Project was used by the Alcoa Corporation to meet the
growing need of aluminum during the Korean Conflict and the Cold War's operations in eastern
Tennessee. An archaeological survey was conducted in portions of the Project identified by the
NCSHPO, Forest Service, and EBCI THPO as having potential to contain historic properties. Phase I
archaeological surveys were completed along the shorelines of Bear Creek Lake, Wolf Creek Lake,
and the Tanasee Creek Lake during a 10 -ft drawdown. A survey of Cedar Cliff Lake was not
performed as part of the evaluation.
As required by license Article 414, Duke Energy maintains and implements an HPMP for the Project.
The HPMP provides measures to avoid, minimize, and mitigate adverse effects on historic properties
from Project operation.
The HPMP includes special provisions associated with large, planned, extended drawdowns, which
is defined as any planned drawdown where the pond elevation will remain at least 10 ft below the
normal minimum elevation for a minimum of 30 consecutive days. Specifically, the provision states
that in the event of a large, planned, extended drawdown, the Licensee will consult NCSHPO and
EBCITHPO regarding the need to conduct archaeological surveys of the exposed area.
5.7.2 Potential Environmental Effects
As described in Section 4, and due to the extent of the planned reservoir drawdown, Duke Energy
initiated consultation with NCSHPO and EBCI THPO regarding the proposed construction activities
and reservoir drawdown. Pursuant to the requirements of the HPMP, Duke Energy sent a letter
dated August 5, 2016 to the NCSHPO and EBCI THPO providing notification and description of the
planned construction activities and associated drawdown at the Cedar Cliff Development. No
response was received by Duke Energy from the EBCI THPO. Via letter to Duke Energy dated
August 30, 2016, NCHPO indicated it is unlikely that any archaeological resources that may be
eligible for inclusion in the NRHP will be adversely affected by the planned construction activities
and drawdown.
5.7.3 Proposed Mitigation Measures
In accordance with the HPMP, in the event that previously unknown archaeological or historic sites
are identified during the course of the reservoir drawdown, Duke Energy will notify the NCSHPO and
ECBI THPO as soon as possible, not to exceed 10 days following the day that Duke Energy
becomes aware of the previously unknown site. Duke Energy will propose a management plan for
the site in consultation with the NCSHPO and EBCI THPO.
Additionally, in the event that a previously unknown archaeological or historic site is discovered
during the course of construction activities, Duke Energy will halt construction and initiate
consultation with the NCSHPO and EBCI THPO. If advised by the NCSHPO or EBCI THPO, Duke
Energy will ensure that a qualified archaeologist assesses the newly discovered site to determine if it
is eligible for the NRHP. If the site is found to be a Historic Property (i.e., eligible or potentially
eligible for the NRHP), Duke Energy will enter into consultation with NCSHPO and EBCI THPO to
determine the appropriate course of action.
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5.8 Recreation Resources and Land Use
5.8.1 Affected Environment
As described in Section 2.3, the FERC Project boundary around the Cedar Cliff Development
encompasses two formal public recreation sites, the Cedar Cliff Access Area, located on Cedar Cliff
Lake, and the Shook Cove Access Area, located downstream of the powerhouses (Appendix A,
Figure 3).
The Cedar Cliff Lake Access Area, which is maintained through a cooperative maintenance
agreement between Duke Energy and NCWRC, currently provides a boat ramp, pier, seasonal
portable toilet, and parking. The site is maintained in accordance with the approved Recreation Plan
for the Project, which was filed with FERC by Duke Energy on December 19, 2011 (supplemented
March 5, 2012) and approved by FERC by order dated November 27, 2012.
5.8.2 Potential Environmental Effects
The planned construction activities are not anticipated to have any effect on the Shook Cove Access
Area.
As described in the Cedar Cliff Lake Drawdown Plan (Appendix E), the Cedar Cliff Access Area will
not be open during construction, as the boat ramp will be unusable during the reservoir drawdown.
The site will remain closed until Cedar Cliff Lake returns to elevation 2,323 ft AMSL or greater.
5.8.3 Proposed Mitigation Measures
Pursuant to the requirements of the FERC -approved Recreation Plan and associated agreement
with the NCWRC, and as noted in the Drawdown Plan (Appendix E), Duke Energy has coordinated
with the NCWRC for methods for closure of the Cedar Cliff Lake Access Area. As mitigation for this
impact, NCWRC requested that Duke Energy use this opportunity to perform additional maintenance
at the site, including paving and limited removal of accumulated sediment under dewatered/dry
conditions. Flow from Kiesee Creek has eroded the existing floating boat dock and sediment has
been deposited in the shallow portion of the reservoir. Duke Energy plans (subject to the terms of
the amended Section 404 and Section 401 Individual Permit issued by USACE and NCDWR) to
excavate the excess sediment from the reservoir to elevation 2,322 ft msl, with all excavated
material to be deposited in upland areas. Installation of a permanent rock vane is proposed to deflect
flow from Kiesee Creek away from the boat launch.
6 Consideration of License Requirements
6.1 License Articles
Standard License Articles 2 and 3, Articles 202 (Exhibit F Drawings) and 203 (Exhibit G Drawings),
and Article 305 (As -Built Drawings)
License Articles 3, 202, and 203 require the licensee to maintain the project work in conformity with
the approved exhibits and that changes to exhibits (A, F, and G) be approved by the FERC. License
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Article 303 requires the licensee to file within 90 days after construction is complete, revised Exhibits
A, F, and G (as applicable) for FERC approval to show the project facilities as -built.
The modifications to project works that will occur as part of the auxiliary spillway upgrade project
have been designed in consultation with and as directed by the FERC ARO to satisfy safe passage
of the IDF without overtopping Cedar Cliff Dam. Following the completion of construction activities,
Duke Energy will file with the FERC revised/as-built Exhibits A, F, and G to reflect permanent
modifications to project works of Cedar Cliff Development.
Article 302 — Contract Plans and Specifications
License Article 301 requires that the licensee submit one copy of the final contract plans and
specifications and supporting design report to FERC ARO and two copies to the FERC at least 60
days prior to construction. The submittal must include a Quality Control and Inspection Program, a
Temporary Construction Emergency Action Plan, and an ESC Plan. The licensee cannot begin
construction until the FERC ARO has reviewed and commented on the plans and specifications,
determined that all pre -construction requirements have been satisfied and authorized the start of
construction.
Duke Energy submitted final contract plans and other submittal requirements to the FERC ARO on
March 18, 2019. Construction will not begin until all pre -construction requirements are met and the
FERC ARO has authorized the start of construction.
Article 401— Reservoir Level Management
License Article 401 requires the licensee to operate the Cedar Cliff Development according to the
reservoir level management provisions, as required by Condition 6 of the [2010] WQC to protect the
aquatic and recreation resources in the Tuckasegee River and to provide downstream flows.
Pursuant to Article 401 and WQC Condition 6, the Normal Operating Range for Cedar Cliff Lake is
2,326 to 2,330 ft AMSL year-round.
General requirements for temporary variances in lake level requirements are addressed in the Hydro
Project Maintenance and Emergency Protocol, which is included as Appendix A in the East Fork
License. Due to the extended duration of the planned reservoir drawdown, Duke Energy is seeking
approval from the FERC for a temporary variance from the requirements of Article 401 in order to
hold the reservoir level at approximately 2,300 ft AMSL for the duration of the required drawdown
period to complete construction activities at the Cedar Cliff Development. The Cedar Cliff Lake
Drawdown Plan included as Appendix E has been developed in consultation with the NCWRC,
USFS, USFWS, and NCDWR.
Article 402 — Recreation Plan
License Article 402 requires the licensee to file with the FERC for approval within one year of license
issuance, a Recreation Plan for the East Fork Hydroelectric Project to enhance the recreation
resources at the Project. Duke Energy filed a Recreation Plan with the FERC for approval on
December 19, 2011, which was supplemented on March 5, 2012. On November 27, 2012, the FERC
issued an Order Modifying and Approving the Recreation Plan.
Cedar Cliff Access Area is currently maintained through a cooperative maintenance agreement with
NCWRC signed on June 5, 2008. Per the 2008 agreement, if it becomes necessary to temporarily
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close any Public Access Area or any portion thereof (e.g. if a lake level is too low to safely use the
access area), written notice shall be provided through electronic mail or by letter to the other party of
such condition, and the Parties will jointly determine the appropriate course of action, including
methods for closure, and public notification. Duke Energy is currently working with the NCWRC
regarding the impacts to the Cedar Cliff Access Area during construction activities.
Temporary impacts to and proposed mitigation measures for the Cedar Cliff Access Area due to the
reservoir drawdown are addressed in Section 5.8.
Article 403 — Public Information at East Fork Project
License Article 403 requires the licensee to continue to provide information on its website and
telephone system in regards to reservoir levels and recreation flows for Cedar Cliff Lake.
Duke Energy will continue to provide information related to the schedule and associated impacts of
the Cedar Cliff Lake drawdown on the existing Duke Energy website (httl)s://www.duke-
energy.com/community/lakes) and telephone system.
Article 404 — Minimum Flows and Flow Monitoring Plan
License Article 404 (as amended) requires the licensee to release minimum flow from the Cedar Cliff
reservoir, as required by WQC Condition 6, consisting of a flow during non -generation hours of 10
cfs from December 1 through June 30 and 35 cfs from July 1 through November 30, or during low
inflow periods a flow of 6 cfs from December 1 through June 30 and 11 cfs from July 1 through
November 30, each year, from the Cedar Cliff Development to the East Fork of the Tuckasegee
River.
Duke Energy will continue to provide the minimum flows from the Cedar Cliff Development required
by Article 404 and WQC Condition 6 and pursuant to the East Fork Minimum Flow/Flow Monitoring
Plan approved by FERC by order dated March 2, 2012. As described in the approved Minimum
Flow/Flow Monitoring Plan, the minimum flow is provided through the minimum flow turbine installed
in 2013, which is capable of meeting the full range of flows required by License Article 404. For any
periods when the minimum flow turbine is not available, the minimum flow will be provided over the
principal spillway.
In the event the required minimum flows cannot be provided during the drawdown period due to low
inflow, Duke Energy will provide written notification pursuant to the FERC -approved Minimum Flow
and Flow Monitoring Plan and Low Inflow Protocol.
Article 405 — Recreation Flow
License Article 405 requires the licensee to operate the East Fork Project in coordination with the
West Fork Project to provide scheduled recreation flow releases into the main stem of the
Tuckasegee River during the recreation season. As described and required by the East Fork
Minimum Flow/Flow Monitoring Plan approved by the FERC by order dated March 2, 2012, the East
Fork Project is operated (1) in accordance with the Normal Generation Schedule to Support
Recreation to facilitate the preferred angling flow of at or below 500 cfs vicinity of the Dillsboro
section of the Tuckasegee River during the Primary Angling Periods defined in the license, and (2) at
or above best efficiency flow in support of boating target flows of about 800 cfs in the vicinity of the
Dillsboro section of the Tuckasegee River during the Primary Boating Periods defined in the license.
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The annual schedule for East Fork Project recreation releases is developed according to License
Article 405 and in consultation with recreation stakeholders.
The auxiliary spillway upgrade is not expected to impact normal generation at the developments of
the East Fork Project. Additionally, in the event that the East Fork Project is unavailable to operate to
facilitate the downstream required recreation flows, license Article 405 allows for the requirements to
be met with flow releases from the West Fork Project. Duke Energy therefore expects to continue to
provide the recreation flows into the Tuckasegee River during the recreation season, throughout the
duration of the drawdown and construction activities.
Article 408 — Shoreline Management Plan
License Article 408 requires the licensee to file for FERC approval a Shoreline Management Plan
(SMP), to be developed in consultation with USFWS, NCWRC, and NCSHPO, to protect the scenic
quality and environmental resources at the Project area. Duke Energy filed the SMP with FERC for
approval on June 29, 2012, which was supplemented on August 31, 2012. On February 20, 2014,
FERC issued an Order Modifying and Approving the SMP.
The proposed drawdown and construction activities are not expected to result in any permanent
changes to the Shoreline Management Plan and are consistent with the approved SMP. The work
area shown in Appendix A, Figure 2 is encompassed primarily within areas classified in the SMP as
"Project Operations."
Article 409 - Sediment Management Plan
License Article 409 (and Condition 6 of the 2010 WQC) requires the licensee to implement a
Sediment Management Plan, to be prepared in consultation with USFWS, NCWRC, USACE, and
NCDWQ, for mechanical removal of sediment/drawdown of Project reservoirs. The Sediment
Management Plan is to include a provision for best management practices to control sedimentation
in the reservoirs upstream of the Cedar Cliff dam from entering the downstream reaches; a provision
for dredging that shall include measures to minimize the impact of the project drawdown and
sediment removal on environmental resources; and an implementation schedule.
As described throughout the current document, no mechanical removal of sediment from Cedar Cliff
Lake is proposed as part of the auxiliary spillway upgrade or associated construction or reservoir
drawdown activities. Sediment management related to short-term construction impacts of these
activities is addressed through the requirements of the Section 404 Individual Permit issued by
USACE and the Section 401 WQC issued by NCDWR for construction. As required by Condition 6 of
the construction (i.e., 2016) 401 WQC, Duke Energy must develop and secure approval of an ESC
Plan prior to commencing drawdown of the reservoir. To prevent sedimentation in the upstream
reservoirs from traveling the downstream reaches, the Individual Section 404 permit issued by
USACE further requires Duke Energy to employ all ESC measures to prevent an increase in
sedimentation or turbidity within waters/wetlands outside the permit area. This shall include, but is
not limited to the immediate installation of silt fencing or similar appropriate devices around all areas
subject to soil disturbance or the movement of earthen fill, and the immediate stabilization of all
disturbed areas. Additionally, the Project will remain in full compliance with the Sedimentation
Pollution Control Act of 1973 (North Carolina General Statutes Chapter 113A Article 4).
Duke Energy developed a Cedar Cliff Lake Drawdown Plan (Appendix E) describing the drawdown
and refill rate, schedule, public outreach, and sediment and erosion control measures associated
May 2019 1 28

Environmental Report FN
Cliff Auxiliary Spillway Upgrade
with the drawdown. On December 15, 2016, the draft Drawdown Plan was provided for 30 -day
review to NCDWR, NCWRC, and USFWS, and each agency provided comments. Duke Energy
incorporated the comments received into the Drawdown Plan, as applicable. An updated version of
the draft Drawdown Plan is being distributed to these same agencies for final review and
concurrence. The final Drawdown Plan including the consultation record and a summary of the
comments received and how they were addressed is provided in Appendix E. The Drawdown Plan
provides a robust set of measures and procedures for the protection of natural resources to minimize
potential impacts associated with reservoir drawdown.
Article 414 — Programmatic Agreement
License Article 414 requires the licensee to implement the "Final Programmatic Agreement Among
the Federal Energy Regulatory Commission and the North Carolina State Historic Preservation
Officer for Managing Historic Properties that may be Affected by a License Issuing to Duke Power
Company, LLC for the Continued Operation and Maintenance of the East Fork Hydroelectric Project
in Jackson County, North Carolina," executed on September 19, 2006, and including but not limited
to the approved HPMP, filed August 7, 2006, for the Project.
Compliance with the HPMP is addressed in Section 5.7.
6.2 U.S. Forest Service 4(e) Conditions
The East Fork Project occupies 23.15 acres of the Nantahala National Forest administered by the
USFS, which is adjacent to the Bear Creek and Tennessee Creek developments. The USFS filed
one final section 4(e) condition on June 19, 2006. The final term and condition is set forth in
Appendix B of the 2011 New License and incorporated into the license by Ordering Paragraph E and
summarized below.
The Forest Service condition 1 requires Duke to provide a minimum flow of 6 cfs into the Wolf Creek
Bypassed Reach between Wolf Creek dam and Tennessee Creek powerhouse from Jan 1 to Dec
31, subject to provisions of the Low Inflow Protocol and the HPMEP.
The Cedar Cliff Development auxiliary spillway upgrade project will have no effect on Duke Energy's
ability to comply with the 4(e) conditions for the East Fork Project.
May 2019 1 29

Environmental Report OR
Cliff Auxiliary Spillway Upgrade
7 References
Byerly, D. W. 1996. Handling acid -producing material during construction: Environmental and
Engineering Geoscience, Volume II, pp. 49-57.
Byerly, D. W. 1990. Guidelines for Handling Excavated Acid -Producing Materials: U. S. Department
of Transportation, Federal Highway Administration, Publication No. DOTFHWA-FL-007,
Washington, DC, 82p.
Cowardin, L.M., Carter, V., Golet, F.C., and LaRoe, E.T. 1979. Classification of Wetlands and
Deepwater Habitats of the United States. U.S. Fish and Wildlife Service, Washington, D.C.
Federal Energy Regulatory Commission (FERC). 2006. Preliminary Final Environmental
Assessment for Hydropower Licenses, Nantahala East Projects, North Carolina. FERC
Office of Energy Projects, Division of Hydropower Licensing, Washington, DC. July 2006.
HDR. 2016. Indiana and Northern Long -Eared Bat Acoustic Survey Report, Cedar Cliff Development
Spillway Upgrade Project. Jackson County, North Carolina, June 13, 2016: Report for Duke
Energy of the Carolinas, LLC
2017. Geological and Geotechnical Subsurface Investigation, East Fork Hydroelectric Project
and Cedar Cliff Development (FERC No. 2698).Tuckasegee, North Carolina, Report for
Duke Energy of the Carolinas, LLC.
2018a. Cedar Cliff Rock Spoil Evaluation, East Fork Hydroelectric Project and Cedar Cliff
Development (FERC NO. 2698). Tuckasegee, North Carolina, January 4, 2018: Report for
Duke Energy of the Carolinas, LLC.
2018b. Cedar Cliff Hydroelectric Development Auxiliary Spillway Upgrade Project Status
Update and Permitting Process. Power Point Presentation for Agency Briefing January 18,
2018.
Martin, W.H., Boyce, S.G., and Echternacht, A.C.1993. Biodiversity of the Southeastern United
States, Upland Terrestrial Communities. S ponso red by the Southeastern Chapter of the
Ecological Society of America.
Nantahala Power and Light. 2000. FERC Relicensing First Stage Consultation Package. East Fork
Hydroelectric Project, FERC Project No. 2608 -NC
North Carolina Division of Water Resources (NCDWR). 2010. Methodology for Identification of
Intermittent and Perennial Streams and Their Origins (Version 4.11).
Schafale, M.P. 2012. Guide to the Natural Communities of North Carolina — Fourth Approximation.
(http://cvs.bio.unc.edu/pubs/4thApproximationGuideFinalMarch2Ol2.pdf)
U.S. Army Corps of Engineers (USACE). 2012. Regional Supplement of the Corps of Engineers
Wetland Delineation Manual: Eastern Mountains and Piedmont Region (Version 2.0). U.S.
Vicksburg, Mississippi. April 2012.
(http://www.usace.army.miI/Portals/2/docs/civilworks/regulatory/req supe/EMP Piedmont v
2b.pd )
1987. Wetland Delineation Manual. Vicksburg, MS.
May 2019 1 30

Environmental Report OR
Cliff Auxiliary Spillway Upgrade
May 2019 1 A-1

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Stereocompilation process in accordance
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I, Walter K Dixon, a Professional Land Surveyor
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Fork Project Maps. The Planimetric and Project Boundary
Contours were produced by Earth Data International based
on NAD 83/95 North Carolina State Plane Coordinates on
the Horizontal Datum and NAVD 88 Elevations converted
to NGVD 29 on the Vertical Datum established by ESP &
Associates. The remaining Project Boundary lines were
produced based on Duke Energy maps and records. Unless
noted, the licensee either owns in fee simple or possesses
appropriate easements over all lands shown on this map
that are inside the project boundary.
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MAP OF PROPERTIES
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FORDRAWING ISEE CCL -0100-001.
FOR ABBREVIATIONS
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FOR LEGEND AND SYMBOLS SEE
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FDR LEGEND AND SYMBOLS SEE
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SHALL PLACE MATERIALS WITHIN FOOTPRINT
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3. PLACEMENT OF SPOIL MATERIAL SHALL
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CEDAR CLIFF RESERVOIR
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FOR ADDITIONAL GENERAL NOTES SEE
FD LL POND EL 2330.0
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CEDAR CLIFF RESERVOIR
1.
CCL-0100-004.
FORDRAWING INDEX SEE CCL-0100-001.
2300 DRAW DOWN EL 2300.0
FOR ABBREVIATIONS SEE CCL-0100-002.
2300 FOR LEGEND AND SYMBOLS SEE
-
CCL-0100-003.
,-
2. LINES ANOGRADES SHOWN ON THE
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EXISTING GROUND
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_777777
PLACEMENT OF SPOIL MATERIALS
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2250
2
2250 SHALL PLACE MATERIALS WITHIN FOOTPRINT
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w
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FOR ABBREVIATIONS SEE CCL-0100-002.
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2. LINES ANO GRADES SHOWN ON THE
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PLACEMENT OF SPOIL MATERIALS
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FOR ABBREVIATIONS SEE CCL -0100-002.
FOR LEGEND AND SYMBOLS SEE
CCL -0100-003.
2. BOAT LAUNCH GRADING CONSTRUCTION
SEQUENCE:
2.1 VERIFY BOAT DOCKS HAVE BEEN
REMOVED BY OTHERS. COORDINATE
WITH OWNER.
2.2 INSTALL EROSION CONTROLL
MEASURES AND TURBIDITY
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CCL-0103-012.
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2.7 INSTALL TEMPORARY STONE
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SHOWN ON CCL-0104-021.—B—
KEYNOTES:
\ 1O DOCKS TO BE REMOVED BY OTHERS
\" PRIOR TO CONSTRUCTION.
Y O2 CONTRACTOR SHALL MAINTAIN
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AUXILIARY SPILLWAY
------ - SHOOK COVE ROAD BOAT RAMP
—F GRADING PLAN—F—
PLAN
SCALE: 1=30' °RCEDAR CLIFF IDF & SPILLWAY UPGRADE
��' DUKEPRELIMINARY
NOTFOR ENERGY. CONSTRUCTIONF)l
OR
Lion Nu—x-115 RECORDING — — D�l4 CCL -0104-020 RAN
440 S Ch..h EI—L S. -ft 1000 Ch—, NO
2020220]5
xes , z s TMs ,a zo ao 4 5 6 ] 6 xn 9RPo 10
A-9

Environmental Report OR
Cliff Auxiliary Spillway Upgrade
May 2019 1 B-1

Kulpa, Sarah
From: Mularski, Eric
Sent: Thursday, May 16, 2019 10:23 AM
To: '[e-mail]'; Homewood, Sue ([e-mail])
Cc: [e-mail]'; '[e-mail]'; 'John.Eddy@duke-
energy.com'; Wise, Jon; '[e-mail]'; Nicholson, Allen
([e-mail]); [e-mail]; Banta, Tim;
Kulpa, Sarah; Little, Michael
Subject: Cedar Cliff Hydroelectric Development Auxiliary Spillway Upgrade Project - Section
404/401 Amendment #2
Attachments: Cedar Cliff Monitoring Plan_20180918.docx.pdf,
CedarCliffAccessAreaSitePlans20l 905l 6.pdf
Mr. Brown & Ms. Homewood,
On behalf of Duke Energy, HDR is requesting an amendment to the previously approved Section 404 (Action ID 2015-
02543) and Section 401 (DWR# 2016-0742) Individual Permit for the Cedar Cliff Development Auxiliary Spillway Upgrade
Project (Project). As part of the amendment, Duke Energy would like to include the revised water quality monitoring plan,
an update to the USACE Individual Special Condition 20.0 regarding required depth of Turbidity Barriers, and
authorization for additional impacts to Cedar Cliff Lake to accommodate the proposed Cedar Cliff Access Boat Ramp —
Temporary Construction Access Road. Brief descriptions of these components are described below.
00 Water Quality Plan — A rock spoil assessment was initiated following internal review of the subsurface
investigation report that indicated the presence of pyrite material in rock core samples in the auxiliary spillway
rock face. These findings were discussed during a Project status update meeting with the environmental
regulatory agencies (including the U.S. Army Corps of Engineers, NC Division of Water Resources, US Fish and
Wildlife Services, and NC Wildlife Resources Commission) on February 8, 2018. The recommendation was made
to develop a Water Quality Monitoring Plan to gather baseline data as well as post -construction data as a due
diligence measure to ensure that placement of all excavated material from the auxiliary spillway into the reservoir
would not adversely affect water quality.
Duke Energy developed a draft Water Quality Monitoring Plan and submitted the document to the agencies for
review. On June 6, 2018, a teleconference was held to discuss the proposed Water Quality Monitoring Plan. Per
recommendations made during the second meeting, the plan has been revised to include a Data Review and
Reporting Requirements section (see attached). The revised Water Quality Monitoring Plan will be attached to the
Section 404/401 Individual Permit amendment.
oo Turbidity Barriers - Duke Energy requests that SAW -2015-02543 Special Condition 20.0 regarding Turbidity
Barriers be revised to read; "Prior to the initiation of any of the work authorized by the permit, the Permittee shall
install floating turbidity barriers with weighted skirts that extend to a depth of at least 5 feet around all work areas
that are in, or adjacent to, surface waters. The turbidity barriers shall remain in place and be maintained until the
authorized work has been completed and all erodible materials have been stabilized."
00 Cedar Cliff Access Area - Temporary Construction Access Road — Duke Energy would like to include an
additional barge access area at the existing North Carolina Wildlife Resources Commission's Cedar Cliff Access
Area to support the Project. This will require an approximately 550 -foot -long temporary access road to the
proposed barge location. The Cedar Cliff reservoir will be drawn down approximately 30 feet in September 2019
after Labor Day to support the installation of the new spillway hoist, maintenance of the radial gate, and the
Project. The required reservoir drawdown will be sustained over the course of approximately 25 months. The
barge access temporary construction road is necessary to maintain access to the Cedar Cliff reservoir for
equipment and material support for the Project during the 25 -month period. Duke Energy is proposing to install an
approximately 500 -foot long temporary stone construction access road below the Cedar Cliff Reservoir full pond
elevation of 2,330 feet above mean sea level (feet msl). The proposed road will terminate at the 2,300 ft msl
reservoir drawdown elevation for barge access (Drawing CCL -0104-021).
B-2

Flow from Kiesee Creek has eroded the existing floating boat dock and sediment has been deposited in the
shallow portion of the reservoir. Duke Energy is proposing to excavate the excess sediment from the reservoir to
elevation 2,322 ft msl as shown on Drawing (CCL -0104-020). All excavated material will be deposited in upland
areas. Installation of a permanent rock vane is proposed to deflect flow from Kiesee Creek away from the boat
launch. A permanent rock ditch (Ditch 6 on the attached plans) parallel to the proposed access road will be
installed to promote flow to the reservoir during the drawdown period. Ditch 6 and rock vane will remain after
construction to promote flow away from the boat launch. To facilitate the construction of Rock Ditch 6 a temporary
pump -around scheme will be employed along a section of Kiesee Creek as shown on Drawing CCL -0103-012.
The proposed limits of the disturbance (LOD) area below the 2,330 ft msl full pond elevation is approximately 1.41
acres. A list of additional impacts below full pond elevation that are requested to be considered as part of this
404/401 permitting addendum are included in the table below.
SHEET Number
Type of Impact
Permanent Impacts
Temporary Impacts
CCL -0103-012
Dewatering
0 acres
45 linear feet
Pump- Around of Kiesee Creek
CCL -0104-020
Excavation
0 acres
0.49 acres
CCL -0104-021
Barge Access Road (Fill)
0 acres
0.49 acres
2,065 cubic yards of rock fill
CCL -0104-020
Rock Ditch
0.70 acres
0 acres
700 cubic yards of rock fill
CCL -0104-020
Rock Vane
0.03 acres (100 cubic yards
0 acres
of rock fill
Attached to this email are the revised Duke Energy Water Quality Monitoring Plan and the proposed Cedar Cliff Access
Area Grading Plans and Details. We ask that you review the attached plans and include the additional impacts as part of
Duke Energy's Section 404/401 Individual Permit authorization.
Please do not hesitate to contact me if you have questions regarding this permit amendment request.
Thank you,
Eric Mularski, PWS
Environmental and Regulatory Team Lead
HDR
440 S. Church Street
Charlotte, NC 28202
D 704-973-6878 M 704-806-1521
Eric. mularskina.hdrinc.com
hdrinc.com/follow-us
B-3

=V
—E
2 3 4 5 6 7 8t3 I
CCL -0103-012
1
O / r / / / /, , / ,'/,/ ' :'/' /' / / /', l , / /' ,', / / / / / / / / , /,ii/ r' ' / // /,'' !/ / / / ,., CEDAR CLIFF RESERVOIR
DRAWDOWN EL 2300.00
01/
Z13��
r// 'PROPERTY LINE (TYPa/ '/ /'/ / / ,'/
,' ,' ' / / • // ' '• '" '\ '�., J , TURBIDITY CURTAIN (TYPE 2) \ \
' !V, SILT FENCE \ \
�' -r 0105-007`V OCK OUTLET (TYP) \ \
I 1 \ \
/ / / / / / / / / / l/ • / / i i / / /
CEDAR CLIFF RESERVOIR r l \
`\ - •'� '•♦ I \
- �--'/' �-- r • / / / ' / � / / /1 / // / ,/,/� ,, � �. �, �. ,,! 3�0 ,- ,' FULL POND EL 2330.00O/
SILT FENCE TYP \ :/'''/ '♦ k J \ \ \ \
FERC LICENSE/ ''♦
/ I —/ / ,' / / / J / f \ / / 1---
/ r / / PROJECT_ BOUNDARY, , ! / 11M _ \i \ / '•♦ / ', \ \ \ \ \ p
lam` \10
J \ \ \ \
SILT FENCE /''' '• \
0105 -007J -HOOK (TYP)' - : l L) \\ \\\ \\\ \\\ \\\
0 \ \ \
/
,, CONSTRUCTION ACCESS ROAD
/ /Co
\ \ \
/ / / / / / / , / ,' / e / / 1 .................._.._. / `.
' 'iii /' /1 // / I ?� '',' /�,/ i /' //, , / l//' ,/ / // ' ! i `�
2 3 0 5
1 1 / /'/i i'/ /! /�/ l /��/ // 1 / l , / , l .-'' ..,./.,'BOAT RAMP 1 I
\ \ \\ \
' 2310
`- �� ...._.._..._..
...._........_._ 41
00,
/ / ..�/, ! / , \ / // / , , / ! / \ 1 \ � ...••'....".--' � h BOAT DOCK
ROCK CHECK DAM 0105-007 \`\ �` �` '♦ ` \ \
LIMITS OF DISTURBANCE
DITCH #6 CL
``
CAUTION: OVERHEAD-----_
POWER LINE \
PARKING LOT
CAUTION: OVERHEAD
// POWER LINE'- \ '♦
1 / \ / ♦ ,i' \ — _ -- — _''wig ' — ��--- .�• •♦ , \ � �
J/
2340
41*
/ "..••`' ,'' \ \ /' , / " Imo. _ 1 '•� ` _ — — — — ter' � — �• ♦� \ �
r,/ , ///—_—\—_— •'\ / �i // �� ��� - -------.2350_ ____-_� ' _ •�•.•� .k—............
..—. -- .�,,�' _ _ __� \ ♦;` \`' `
TEMPORARY GRAVEL �� 1 /.� �------------------ _ \ _ •-----•-- \\ --...........♦`\__ \,
r/ �.• INSTALL PUMP -AROUND MEASURES�5_• _-- _ ___- _ ----/---, \\I \-- J '♦,, \
CONSTRUCTION ENTRANCE 1 °� !/' _
/ 0 05-005.•' ,FOR- DITCH CONSTRUCTION ONLY 0105-008-
�, .:"•-••-•�-- =.._. .. ''. `\ / I -, ==_ =2360 -_--`, _ ___ _______'=----- '♦
/ ' /I•� `^/' ' /"'.v '/' ^\\ \ / ,—' /' / r' r— — — 370• _
'� t' ;✓�'' -- -\_ / ,;/' \ COORDINATE WITH OWNER BEFORE REMOVING TREES
-, r \ ONLY CLEAR TREES NECESSARY TO INSTALL PUMP/ - _____________ `-- •\_ - _---__ - -------- - --- -
'�♦ f/ •\ �� `/,,-- \`\ _ �� �/ AROUND MEASURES �,'//,i !' ;,--- ---,_ \ - _______-------------- ----- TITLE
GENERAL NOTES:
REV. B
1. FOR ADDITIONAL GENERAL NOTES SEE
CCL -0100-004.
FOR DRAWING INDEX SEE CCL -0100-001.
FOR ABBREVIATIONS SEE CCL -0100-002.
FOR LEGEND AND SYMBOLS SEE
CCL -0100-003.
2. SEE CCL -0104-020 AND CCL -0104-021
FOR GRADING PLAN AND BOAT RAMP
CONSTRUCTION SEQUENCE.
3. TEMPORARY IMPACTS BELOW ELEVATION
2330.0 = 1.5 ACRES,
30 0 30
0009
SCALE: FEET
PLAN
SCALE: 1 "=30'
FOR
HDR Engineering, Inc. of the Carolinas License Number: F-0116
440 S Church Street, Suite 1000 Charlotte, NC 28202-2075
•' \ '' '-^ _
'
' ' --- --- ________-_-_-
____-_-_-_-_--- __ _ ___ �'
-�
AUXILIARY SPILLWAY
DUKE
E N ERG IF
}`l '^ '♦,; , / ' J 1 f \`
`_--
`\ -,
, ` -' -',
CEDAR CLIFF ACCESS AREA
-F
JOB N0: 10060948
CHKD:
EROSION AND SEDIMENT CONTROL PLAN
PLAN
SCALE: 1 "=30'
FOR
HDR Engineering, Inc. of the Carolinas License Number: F-0116
440 S Church Street, Suite 1000 Charlotte, NC 28202-2075
PRELIMINARY
NOT FOR
CONSTRUCTION
OR
RECORDING
�,``��\`� CARO B'''
°
ESSI
\ ��°Q�oF oN9l!L9 '
SEAL -
= 137911
'
-; ��°° ENGINEER°°' ��;'
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��'"'�""���
PE SEAL
DUKE
E N ERG IF
SCALE: AS NOTED
DES: MGL
DWG TYPE: DGN
DFTR: JTTD
JOB N0: 10060948
CHKD:
DATE:
FILENAME: CCL-0103-012.DGN
APPD:
DWG SIZE
DRAWING NO.
REVISION
B ISSUED FOR BIDS. JTTD MGL
ANSI D 22.0"x34.0"
CCL -0 103-012
B
A 3/13/2019 ISSUED FOR BIDS. JTTD MGL — —
N0. DATE REVISION DFTR DES CHKD APPD
INCHES 1 2 3 TENTHS 4 5 6 7 8 9 10
10 20 30
1 1 1 1 1 1 1 B_4

2 3 4 5 6 7
4.
\ I \ / / / / / ' / /' ✓ / / ' / / / / / / , if , / / / / " ' / ' ' / / / / / / / /� / // ', , '/ / �' _-'_�/ � / ' , /
Of Of
,' ,' ,'/♦ /,i / //, , , // ♦/ / �/ / , ♦ /// /// / , / /
/' / / / / ♦ / / h /' ,/ ' " / / ♦ / /iii' /' 1 ; / / ' / / / / ' / / / / / /, / / / / / / , /// , /, ' /, / / 1 1 1 /
/
1
1
I
I
N
\ \ \ \ 1 I I
\ \ \ \ 1 I I
\ \ \ 1 I
1
CCL -0104-020
-_♦� �' / / ♦ / / ' / ' ' / / ', / ' ,'/ :'/ 'i:=' ,'/,'/ /,'/ r I I I / CEDAR CLIFF RESERVOIR
/ o / ,t r / / / / I DRAWDOWN EL 2300.00
/ ♦ / / r / / \ \
.',' . . ♦ / ' / / / '/ / / �`, /f /O//// /l / \ /// _ , / / ,PROPERTY LINE (TYP� , ♦� / /. . �/r y , /, ♦ _- � \ I 1 •�. I \
Of Q5
CEDAR CLIFF RESERVOIR \ \
/ ' / /'// \\ I \ \ \ \
1�0 ♦ / / I FULL POND EL 2330.00
/ r / / / tt , , I , // // / . / ,�_�/ //// ♦ ��/ / / 0/ / / / / - ` ` ��� TERMINATE PERMANENT
` DITCH AT ELEVATION
,', /./ ,' r ♦ /, ♦ , l I! / % /i/ l FERC LICENSE / / , , ,/ / / / .' / / /I / / 1 \ \ \ '•�
1� \ 2300.00 \ \ \ \ 00
/ /f / ' / l / /PROJECT BOUNDARY, (- - - - _ `` ``\ ''� \\ \\ \\ \\ O
•
If
it . /l, / / / / , / , / / , , I I- , ♦ , , / / , , _ _ \ \ \ \ ••` \ \
/
Of
/ \ I / I r
j
1 / ' ♦ / '/, , / / / ! / f / / / / / , , , , REMOVE SEDIMENT \
l l l l / ,' / ,' / / /, / /ii' // � / , , / / , / ♦ � '' ,�' /' r 'l � _ / j' , / � 1 . \ DEPOSITS. GRADE�N� o x \\ \ \\ \\ \\ \\ \\
/ ,'// ,',' //�/, / I /// /////' /// // , ♦/�,/ �, �, �/ / I/ / , /___� , TO ELEVATION 2322.00 N \\ \\ \\ \ \ \\ \\ 11
If
�'1 N
I I I I I 1 / 1 /''/1/ /- I : -- // , ,'// ,' ////,/ / /,'I l ,/ / / ,'' --''-- '' '' '' \\ 1 \` \` O
1 1 1 I / //, / 1 ! // */ 2322\
/ / / / / I 1 I � / _-' 1 i 1 / FILL CHANNEL AND
GRADE AREA TOWARDS \
/// I //,///��� /. / ///r , ♦ �, , / , /// / i i I I I I j I \`^ / 2322.0 CONTOUR
BOAT RAMP
IF
\ ` ` \ \ \ \ \
REV. B
GENERAL
NOTES:
1. FOR
GENERAL NOTES SEE CCL -0100-004.
FOR
DRAWING INDEX SEE CCL -0100-001.
FOR
ABBREVIATIONS SEE CCL -0100-002.
FOR
LEGEND AND SYMBOLS SEE
CCL -0100-003.
FILENAME: CCL-0104-020.DGN
2. BOAT
LAUNCH GRADING CONSTRUCTION
SEQUENCE:
2.1
VERIFY BOAT DOCKS HAVE BEEN
ANSI D
22.0"x34.0"
REMOVED BY OTHERS, COORDINATE
JTTD MGL - -
WITH OWNER.
2.2
INSTALL EROSION AND SEDIMENT
CONTROL MEASURES AND TURBIDITY
CURTAIN AS SHOWN ON
CCL -0103-012.
2.3
REMOVE SEDIMENT DEPOSITS AND
GRADE TO ELEVATION 2322.00 AS
SHOWN ON PLAN,
2.4
INSTALL PUMP AROUND MEASURES
TO CONSTRUCT DITCH 6.
2.5
INSTALL DITCH 6 AS SHOWN ON
CCL -0104-021; IMMEDIATELY
STABALIZE WITH RIPRAP.
2.6
INSTALL ROCK VANE.
2.7
AFTER DITCH 6 IS INSTALLED
REMOVE PUMP AROUND
MEASURES.
2.8
GRADE BOAT RAMP AND FILL
EXISTING CHANNEL AS SHOWN
ON PLAN.
2.9
INSTALL TEMPORARY STONE
CONSTRUCTION ACCESS ROAD AS
SHOWN ON CCL -0104-021.
2.10 AFTER PROJECT IS COMPLETE,
REMOVE ACCESS ROAD AND
RESTORE GRADES AS SHOWN.
3. PERMANENT IMPACTS BELOW ELEVATION
\ \ \ \ \
\ \ 2330.0 = 0.70 ACRES.
It
KEYNOTES:
// /1/ / I / / / // ,' / I / I , 1 � I I 1 \\ \\ \ \\ \ \ \
1 / / / , , / I / , / \ N 1 ' \ • \y \ \ • ` \ �'� 1O DOCKS TO BE REMOVED BY OTHERS
Of PRIOR TO CONSTRUCTION.
CONTRACTOR SHALL MAINTAIN
DITCH 6 AGGREGATE BASE ON PARKING LOT IN
1 `, I ` •�• GOOD CONDITION.
RIPRAP LINED 0105-012 3 1 \ •�'`�•
I •`• CONTINUATION OF DITCH DURING
/ 1 , 1 I '1 1\ I, / ; I `\ `\ `\ 1 I \ '--_,-_- `\ `\ `\ `. •� O3 SEE CCL -0104-021 FOR
-
I CONSTRUCTION PHASE.
I / 1 I
/------
// I ` `\ I I \ \ ------------\\ \\ \ \\ \ `\ \ \` \
(DBOAT DOCK \
O2 PARKING LOT 1 /��•, --- ` \ ` I / / _----__ �`,
TOP OF ROCK VANE 2332.0
ROCK VANE � / ' 11 ••�•• r � �� \ \ \\ � � � r - � �\ \
n 1 i• / / / /, / ' / ` \ 0105-012 I \
.,2340
--------------
` / / / / / I � ( `\ / / ,..r / ,moi // \-' / 1 �- �--' _ -`'rte•: � \� \---` \ �-� \ ---- _-- i'`-/ �--- \ �
-1_ j_ w - 6, -- \� \- _--___ ♦-- _/-' -__'- \ 44 \`\
1 I � / \ ' / i// � -�/ / '. ^/,/ - _ `------------ _ `` �`_` - �_ �-�� ter.` _/� '�-'_�-- -' .�•�• �\ \ ��\\ �\\
_ _ _-- - - - - -9 --- .',.�• •�`• \\\\\ \\�
1 /' / /'%'_--------2350------- �_ \ `- 1 •�..�, _.. �.. _..�• 1 --• .�- _ - \ \ •� \\ ( \'a\\
------------
30 0 30
�. ' 1 :��✓�'� --- � _ -\_ -`�`'� /' /' � \\ /'.' ` -- /, ,- �. �--�- --„ 2____ .: � -'_' '----_----- --_-_ `------ -_-- �------
SCALE: FEET
370`
TITLE
_ AUXILIARY SPILLWAY
CEDAR CLIFF ACCESS AREA
-F GRADING PLAN
HDR Engineering, Inc. of the Carolinas License Number: F-0116
440 S Church Street, Suite 1000 Charlotte, NC 28202-2075
PLAN
SCALE: 1 "=30'
PRELIMINARY��� C A Ro�''�',,,
NOT FOR � o EESS�p
Q�oN90
l
�o °
SEAL oo
o
CONSTRUCTION = 03791 =
o.
ORNGI
RECORDING ,,'1.
ygFl G.°v \\
''fill,I II" w\
PE SEAL
INCHES 1 2 3 TENTHS 10 20 30 4 5 6
I I I
B
A 3/13/2019
NO. DATE
ISSUED FOR BIDS.
ISSUED FOR BIDS.
i
REVISION
FOR
DES: MGL
DFTR: JTTD
CHKD:
APPD:
REVISION
B
DFTR DES CHKD APPD
8 9 10
I I B-5
DUKE
ENE""
SCALE: AS NOTED
DWG TYPE: DGN
JOB NO: 10060948
DATE:
FILENAME: CCL-0104-020.DGN
DWG SIZE
DRAWING NO.
JTTD MGL
ANSI D
22.0"x34.0"
CCL -0104-020
JTTD MGL - -
DES: MGL
DFTR: JTTD
CHKD:
APPD:
REVISION
B
DFTR DES CHKD APPD
8 9 10
I I B-5

CCL -0104-021
REV. B
GENERAL NOTES:
1. FOR GENERAL NOTES SEE CCL -0100-004.
FOR DRAWING INDEX SEE CCL -0100-001.
FOR ABBREVIATIONS SEE CCL -0100-002.
FOR LEGEND AND SYMBOLS SEE
CCL -0100-003.
2. SEE CCL -0104-020 FOR
GRADING SEQUENCE.
3. TEMPORARY IMPACTS BELOW ELEVATION
2330.0 = 1.5 ACRES.
/ ♦ . ♦ , / / �/ / /./ p//.// / /, / /,//,' • / _„ / / / , /, / , / / ♦ / , ♦ ♦ / ,','`� /: s%' / /, / / r / -/ I I I / CEDAR CLIFF RESERVOIR
/ . , O, , / , Ir • ♦ , • I , ._.._ DRAWDOWN EL 2300.00 \ \ \
(NV/
�/ ;PROPERTY LINE (TYP)' / / r / ,.,;/.' /,:/ 7'/'//, , , / ,�--/- \\ I I '-�,•`• I \ \ \ \
,/����///, / / , /// / /,/ / ///r/� :' � /i,' /, /'n/ �O / �/ � �/ / / /' /'/ / / //// / / // / ,/ / \_ � \\ �_- '•� `\ 1 \ \ \ KEYNOTES:
'' � , , , , , / / ♦ ,, , /ii , / ,/ ,, �, � ' � // / � , / , , CEDAR CLIFF RESERVOIR
r/r+ /'/' // FULL POND EL 2330.00 \ I \ \
♦ / / / / / / 1 / 1 / /
9 \ I \ \ \ 1 DOCKS TO BE REMOVED BY OTHERS
/ /1 // / / //, /, / . , �J / 0 , . , 1/ / 1 / / / �\ II ` \ \
l/'i/ / 2 'Ij0 ''� k21k$ PRIOR TO CONSTRUCTION.
V,O'r / /' /' / --_ \ •� \\ \\
- �,, //// ,///I \ ,, , / ♦ _/ //�, , \__` \\ \ 2� •.`' \ \ \ \ \ O2 INSTALL TEMPORARY STONE ACCESS
FERC LICENSE // /' ' ' I
5 \ 1 CONSTRUCTION ROAD AFTER GRADING
/PROJECT BOUNDARY11 r_/ ,','�, ,� / I I / / / � + IV --___ -` \\ i '•� \ 1 \ \ \ \ W SHOWN ON CCL -0104-020 IS
/ _ /,' / / , /i///I /, / ,,, ,/ , , ♦ I ,_/ / I / / / / \ \ \ N \ \ \ \ COMPLETE. SEE GENERAL NOTE 2.
-' ,,- ,,�/ „/,/ ,, /� „ /� � / // , / ♦, 1 I^ -_,/ , , , � \ -___\ `\ \ '•� \ \ o \ \ \ \ O3 SEE CCL -0104-020 FOR FINAL DITCH
' /i . • / r / - / / '- \ \ \ \ \\ ` `\ `\ `\ GRADES.
CONFIRM PAD DIMENSIONS WITH OWNER
PRIOR TO CONSTRUCTION. PAD SIZE
,� �, /„� �• ,� // ,,/ / / / / , , , , , , �, \ / 1 / , / I \ SHALL ACCOMMODATE CRANE USED FOR
/ /
, ' 4 r� BARGE ASSEMBLY.
11 /, /, /, ./,/ , //// ////, // // /, //' // // ,' ' ,/ I /r ,' \ \`\\ / / 21-\0}q,g�.V2 TERMINATE TEMPORARY DITCH AT
e,, / I / • / , I \ J DRAWDOWN ELEVATION 2300.00 \
/ / / / ,' .',.' .'//' / I / ;IJ , /, / / / / // // / / . ,/ / . ♦ , / ,- , , / ! - TEMPORARY STONE
0105-012 CONSTRUCTION ACCESS ROAD `
2305
/ 2310
\ \
BOAT RAM P
/ /�/ / r♦ /,, , / , / / , ' 1 BOAT DOCKlei
DITCH #6 CL
01
/ // ,I//ltt _ /'/ / /' / I J I \I II ' /' I 11 kpp/ / G �•^• I \ \`� \` \` \\` \\`
�•_\ \
♦''/'' /+�- i PARKING LOT
ALIGNMENT CURVE TABLE
CURVE NO.
PI STATION
DELTA
RADIUS
TANGENT
LENGTH
CHORD DIRECTION
CHORD LENGTH
C1
0+68.70
036°45'21.93"
100.00'
33.22'
64.15'
N39°39'44.47"E
63.06'
C2
1+43.53
043°37' 14.61'$
50.00'
20.01'
38.07'
N43°05'40.81 "E
37.15'
_.\._.._.. _. •. / \ /'✓ / / /' _ I `� ,' /- / _--^ -2360`-
237&---
X
370'`_
-----------------
-------- ---
ALIGNMENT
---------
P LAN
SCALE: 1 "=30'
30 0 30
TITLE AUXILIARY SPILLWAY
CEDAR CLIFF ACCESS AREA
CONSTRUCTION ACCESS ROAD
GRADING PLAN
FOR
HDR Engineering, Inc. of the Carolinas License Number: F-0116
440 S Church Street, Suite 1000 Charlotte, NC 28202-2075
ALIGNMENT LINE TABLE
PRELIMINARY
NOT FOR
CONSTRUCTION
OR
RECORDING
�,�`��\`� CARo���'%,
.........
ESSI
\ ��°Q�oF oN9l!L9
SEAL -
= 137911
'
�; ��°° ENGINEER°°' ��;'
�.°�-�
��'""""���
PE SEAL
LINE NO.
LENGTH
DIRECTION
DES: MGL
START POINT
DWG TYPE: DGN
END POINT
L1
549.89
N65°
21'
18"E
N
779427.4419
N
779927.2402
APPD:
DWG SIZE
DRAWING NO.
E
569436.4247
E
569665.7248
L2
14.45
N61°
42'
35"E
N
779464.5016
N
779477.2297
/;'
_ _
•,2340
569357.6491
L3
21.02
N58°
02'
25"E
N
779477.2297
N
79495.0632
E
569357.6491
E
569368.7752
14
23.89
N21*
17'
04"E
N
779535.3102
N
779543.9837
E
569417.3177
E
569439.5822
L5
388.24
N64°
54'
18"E
N
779569.3672
N
779920.9632
E
569466.7127
E
569631.3746
_ _ ��.._,•_•
_-------.2350----_��---____\
\
_.\._.._.. _. •. / \ /'✓ / / /' _ I `� ,' /- / _--^ -2360`-
237&---
X
370'`_
-----------------
-------- ---
ALIGNMENT
---------
P LAN
SCALE: 1 "=30'
30 0 30
TITLE AUXILIARY SPILLWAY
CEDAR CLIFF ACCESS AREA
CONSTRUCTION ACCESS ROAD
GRADING PLAN
FOR
HDR Engineering, Inc. of the Carolinas License Number: F-0116
440 S Church Street, Suite 1000 Charlotte, NC 28202-2075
ALIGNMENT LINE TABLE
PRELIMINARY
NOT FOR
CONSTRUCTION
OR
RECORDING
�,�`��\`� CARo���'%,
.........
ESSI
\ ��°Q�oF oN9l!L9
SEAL -
= 137911
'
�; ��°° ENGINEER°°' ��;'
�.°�-�
��'""""���
PE SEAL
LINE NO.
LENGTH
DIRECTION
DES: MGL
START POINT
DWG TYPE: DGN
END POINT
L1
549.89
N65°
21'
18"E
N
779427.4419
N
779927.2402
APPD:
DWG SIZE
DRAWING NO.
E
569436.4247
E
569665.7248
L2
14.45
N61°
42'
35"E
N
779464.5016
N
779477.2297
E
569350.7985
E
569357.6491
L3
21.02
N58°
02'
25"E
N
779477.2297
N
79495.0632
E
569357.6491
E
569368.7752
14
23.89
N21*
17'
04"E
N
779535.3102
N
779543.9837
E
569417.3177
E
569439.5822
L5
388.24
N64°
54'
18"E
N
779569.3672
N
779920.9632
E
569466.7127
E
569631.3746
_.\._.._.. _. •. / \ /'✓ / / /' _ I `� ,' /- / _--^ -2360`-
237&---
X
370'`_
-----------------
-------- ---
ALIGNMENT
---------
P LAN
SCALE: 1 "=30'
30 0 30
TITLE AUXILIARY SPILLWAY
CEDAR CLIFF ACCESS AREA
CONSTRUCTION ACCESS ROAD
GRADING PLAN
FOR
HDR Engineering, Inc. of the Carolinas License Number: F-0116
440 S Church Street, Suite 1000 Charlotte, NC 28202-2075
PRELIMINARY
NOT FOR
CONSTRUCTION
OR
RECORDING
�,�`��\`� CARo���'%,
.........
ESSI
\ ��°Q�oF oN9l!L9
SEAL -
= 137911
'
�; ��°° ENGINEER°°' ��;'
�.°�-�
��'""""���
PE SEAL
DUKE
E N ERG IF
SCALE: AS NOTED
DES: MGL
DWG TYPE: DGN
DFTR: JTTD
JOB NO: 10060948
CHKD:
DATE:
FILENAME: CCL -0104-021 .DGN
APPD:
DWG SIZE
DRAWING NO.
REVISION
B ISSUED FOR BIDS. JTTD MGL
ANSI D .0"x3 0"
224.
CCL -0
B
A 3/13/2019 ISSUED FOR BIDS. JTTD MGL - -
N0. DATE REVISION DFTR DES CHKD APPD
INCHES 1 2 3 .........TENTHS 10 20 30 4 5 6 7 8 9 10
1 I 1 1 1 1 1 B_6

-E
-F
PIPE AS REQUIRED
PROVIDE TYPE 1
GEOTEXTILE UNDER STONE
6" MIN
MAINTENANCE:
MAINTAIN THE GRAVEL PAD IN A CONDITION TO PREVENT MUD OR SEDIMENT
FROM LEAVING THE CONSTRUCTION SITE. THIS MAY REQUIRE PERIODIC
TOPDRESSING WITH SEDIMENT, CLEAN OUT AS NECESSARY. IMMEDIATELY REMOVE
ALL OBJECTIONABLE MATERIALS SPILLED, WASHED, OR TRACKED ONTO PUBLIC ROADWAYS.
TEMPORARY GRAVEL CONSTRUCTION
ENTRANCE DETAIL 1
SCALE: NOT TO SCALE 0103-003
0103-009
0103-010
0103-012
0103-023
SILT FENCE FABRIC
INSTALLED TO
SECOND WIRE FRON
GALVANIZED WOVEN
WIRE FIELD FENCE,
14 GAUGE WITH 6" M
VERTICAL STAY SPAM
6"X6" MAX
MESH SPACII
GRADE
SPACING:
8' OC MAX W/WIRE FENCE
6' OC MAX EXTRA STRENGTH
EXTRA STRENGTH FILTER FABRIC
NEEDED WITHOUT WIRE MESH FABRIC-
HARDWARE
ABRIC-HARDWARE CLOTH
19 GAUGE WITH 1/4" SPACING
MSN
STEEL POST �, MP
(1.25 LB/LIN FT
STEEL-51FT MIN LENGTH)
3' MIN STEEL POST
4' MAX (1.25 LB/LIN FT
STEEL - 5FT MIN
HARDWARE CLOTH LENGTH)
MEDIAN 8" DIA RIPRAP
MAX: 1'-6" HIGH
� F
6" MAX SPACING
GENERAL NOTES:
1. SEDIMENT FILTER OUTLET AND HARDWARE CLOTH SHALL BE 16
INCHES HIGH BUT NO TALLER THAN 18 INCHES.
2. HARDWARE CLOTH SHALL BE ANCHORED TO THE STEEL POSTS
SECURELY USING APPROPRIATE ANCHORS. HARDWARE CLOTH
SHALL BE KEYED A MINIMUM OF 12 INCHES IN LENGTH AND
BACKFILLED PROPERLY AS SHOWN IN ABOVE DETAIL.
3. POST SHALL BE NO MORE THAN 4 FEET APART.
4. SITE OUTLETS AT ANY POINT WHERE SMALL CONCENTRATED FLOW
IS ANTICIPATED AND AT THE DIRECTION OF THE INSPECTOR.
MAINTENANCE NOTES:
1. WASHED STONE (#57) TO BE REMOVED AND REPLACED ONCE IT
BECOMES CLOGGED WITH SEDIMENT.
2. SEDIMENT TO BE REMOVED WHEN ACCUMULATIONS REACH 113
HEIGHT OF SILT FENCE.
3. THE KEY TO FUNCTIONAL ROCK OUTLETS IS WEEKLY INSPECTIONS,
ROUTINE MAINTENANCE, AND REGULAR SEDIMENT REMOVAL.
SILT FENCE
(MAX) 1 �1 (MAX)
1.5 1.5
0
J
LL.
ROCK PLAN
0'-9" MIN
PONDING HEIGHT
STEEL POST
3' ABOVE GRADE (MAX)
RUNOFF
r?
6" MIN THICK
WASHED STONE
(NCDOT #5 OR #57)
FACE ON UPSTREAM SIDE
SILT FENCE ROCK OUTLET DETAIL
SCALE. NOT TO SCALE
C7 `1 POST (1.25 LB/FT)
✓EN WIRE FABRIC
FENCE FABRIC
FILL SLOPE
GRADE
EXCAVATE TRENCH 8" DEEP X 4" WIDE
BURY FABRIC 8" ALONG SIDE AND 4"
ACCROSS THE BOTTOM
-11 III r mViV Iyicyy IIII SIDE VIEW
II II :III I-
-11 k I III
II II -III I-
III III ill- IIII
NOTES:
1. FABRIC, PER NCDEQ 6.62, TO BE ANCHORED IN THE TRENCH 8" DOWN AND 4" HORIZONTAL AND THEN BACKFILLED WITH
EARTH AND COMPACTED.
2. POSTS TO BE MIN. OF 2'-0"IN GROUND.
3. BRACE POSTS WHERE NECESSARY.
4. ATTACH FABRIC WIRE AND POSTS WITH METAL RINGS ON PLASTIC ZIP TIES (50 LB MIN. TENSILE).
5. POST SHALL BE 5' (MIN.) STEEL "T" POST WEIGHING A MIN. 1.25 LB PER LF, MANUFACTURED WITH CLIPS.
6. WATER SHALL NOT BE IMPOUNDED TO A DEPTH GREATER THAN 1.5 FT AT ANY POINT
ALONG FENCE, CONTRACTOR SHALL INSTALL A FENCE IMPOUNDMENT OUTLET, SEE DETAIL 3.
MAINTENANCE NOTES:
1. SHOULD THE FABRIC OF A SEDIMENT FENCE COLLAPSE, TEAR, DECOMPOSE, OR BECOME
INEFFECTIVE, REPLACE IT PROMPTLY.
2. REMOVE SEDIMENT DEPOSITS AS NECESSARY TO PROVIDE ADEQUATE STORAGE VOLUME FOR THE NEXT
RAIN EVENT AND TO REDUCE PRESSURE ON THE FENCE. TAKE CARE TO AVOID UNDERMINING THE FENCE
DURING CLEANOUT.
3. REMOVE ALL FENCING MATERIALS AND UNSTABLE SEDIMENT DEPOSITS AND BRING THE AREA TO GRADE
AND STABILIZE IT AFTER THE CONTRIBUTING DRAINAGE AREA HAS BEEN PROPERLY STABILIZED.
SILT FENCE DETAIL K
SCALE: NOT TO SCALE
0103-003 0103-007
0103-011
0103-025
1/4
0103-004 0103-008
0103-022
0103-027
0103-022
0103-005 0103-009
0103-023
0103-028
0103-023
0103-010
0103-024
0105-005
0103-025
0 z
I �
i�
4"
ROCK SECTION
TRENCH WITH GRAVEL
DESIGN
TYPE
DRAINAGE AREA
APPROX
WEIR LENGTH (L)
MIN
1/4
1/2 ACRE
3.0 FT
0103-002
0103-002
0103-011
0
0103-004
0103-003
0103-024
0103-022
0103-005
0103-005
0103-025
0103-023
0103-006
0103-007
0103-026
0103-025
0103-007
0103-008
0103-027
0103-027
0103-010
0103-028
LOCATE FENCE OUTSIDE
OF TREE BRANCH SPREAD
IN
PLAN
3'-0" HT ORANGE WARNING FENCE
2"X2" PT STAKE
@ 8'-0" OC
NOTE:
TREE PROTECTION SHALL BE ORANGE SAFETY FENCE, 3FT MINIMUM HEIGHT.
TREE PROTECTION FENCE DETAIL r
SCALE: NOT TO SCALE
0103-002
0 0
0
0103-004
0103-024
0103-005
0103-025
0 0
0103-006
0 0
0103-026
N
-n
0103-007
N ITII
0103-027
SF
0103-008
0103-028
0103-022
2' MIN
SIDE VIEW
PLAN
CCL -0105-005
STRAW 10' MIN
BALE (TYP) STAKE
(2 PER BALE)
Cn
w
dE
0 0
0 0
0 0
0
FLOW
0 0
0 0
0 0
0 0
1/8" DIA
STEEL WIRE
STAPLES
(2 PER BALE)
PLAN
10 MIL PLASTIC
{} �� LINER
a
'--10 MIL
PLASTIC LINER
BINDING
WIRE
EXISTING
GRADE
GENERAL NOTES:
w_1
1. FOR GENERAL NOTES SEE
CCL -0100-004.
FOR DRAWING INDEX SEE
CCL -0100-001,
FOR ABBREVIATIONS SEE
CCL -0100-002
FOR LEGEND AND SYMBOLS SEE
CCL -0100-003.
WOOD OR V u
METAL STAKESJ STRAW
(2 PER BALE) NATIVE MATERIAL BALE
(OPTIONAL)
SECTION A
NOTE:
INSTALL CONCRETE WASHOUT A MINIMUM OF 50' FROM DRAINAGE FEATURES. IF 50'
MINIMUM DISTANCE CANNONT BE MAINTAINED, INSTALL SECONDARY PERIMETER
CONTAINMENT.
CONCRETE WASHOUT DETAIL
SCALE: NOT TO SCALE 0103-022
C:
I
K
`TrrL POST (1.25 LB/FT)
SEN WIRE FABRIC
F FENCE FABRIC
STEEL POST (1.25 LB/FT)-
-SF-
B/FT)--SF- -SF- -SF- SF -
TITLE
AUXILIARY SPILLWAY
EROSION AND SEDIMENT CONTROL
DETAILS
FOR
CEDAR CLIFF IDF &SPILLWAY UPGRADE
SCALE: AS NOTED DES: MGL
PRELIMINARY DUKE DWG TYPE: DGN DFTR: JTTD
NOT FOR ENERGY JOB N0: 10060948 CHKD:
CONSTRUCTION DATE.
FILENAME: CCL -0105-005. DGN APPD:
OR DWG SIZE DRAWING NO. REVISION
HDR Engineering, Inc. of the Carolinas License Number: F-0116 RECORDING A ISSUED FOR BIDS. CL MGL - - ANSI D CCL_p 105-005 A
440 S Church Street, Suite 1000 Charlotte, NC 28202-2075 22.0"x34.0" v
PE SEAL N0. DATE REVISION DFTR DES CHKD APPD
INCHES 1 2 3 TENTHS 10 20 30 4 5 6 � 8 9 1 0
B-7
M -A
N
GRADE
SEE NOTE 1
FLOW
Ln
_ _
p l l N &
I I III
III==11 r=� r=� 1-
I -11I �=1TV 11-
-1 _III-�I I�-
N
-n
N ITII
F7=011-
EXCAVATE TRENCH 8" DEEP X 4" WIDE
SF
-1 III�II� BURY FABRIC 8" ALONG SIDE AND 4"
ACCROSS THE BOTTOM
III=III=III=
2' MIN
SIDE VIEW
PLAN
NOTE:
1. J -HOOKS TO BE CONSTRUCTED WITH ONE CONTINUOUS LENGTH OF
SILT FENCE FABRIC.
MAINTENANCE NOTES:
1. SHOULD THE FABRIC OF A SEDIMENT FENCE COLLAPSE, TEAR, DECOMPOSE, OR BECOME
INEFFECTIVE, REPLACE IT PROMPTLY.
2. REMOVE SEDIMENT DEPOSITS AS NECESSARY TO PROVIDE ADEQUATE
STORAGE VOLUME FOR THE NEXT
RAIN EVENT AND TO REDUCE PRESSURE ON THE FENCE, TAKE CARE
TO AVOID UNDERMINING THE FENCE
DURING CLEANOUT,
3. REMOVE ALL FENCING MATERIALS AND UNSTABLE SEDIMENT DEPOSITS
AND BRING THE AREA TO GRADE
AND STABILIZE IT AFTER THE CONTRIBUTING DRAINAGE AREA HAS BEEN PROPERLY STABILIZED,
SILT FENCE J -HOOK DETAIL
SCALE: NOT TO SCALE
0103-003
0103-005 0103-023
0103-007 0103-025
0103-010 0103-027
0103-011
TITLE
AUXILIARY SPILLWAY
EROSION AND SEDIMENT CONTROL
DETAILS
FOR
CEDAR CLIFF IDF &SPILLWAY UPGRADE
SCALE: AS NOTED DES: MGL
PRELIMINARY DUKE DWG TYPE: DGN DFTR: JTTD
NOT FOR ENERGY JOB N0: 10060948 CHKD:
CONSTRUCTION DATE.
FILENAME: CCL -0105-005. DGN APPD:
OR DWG SIZE DRAWING NO. REVISION
HDR Engineering, Inc. of the Carolinas License Number: F-0116 RECORDING A ISSUED FOR BIDS. CL MGL - - ANSI D CCL_p 105-005 A
440 S Church Street, Suite 1000 Charlotte, NC 28202-2075 22.0"x34.0" v
PE SEAL N0. DATE REVISION DFTR DES CHKD APPD
INCHES 1 2 3 TENTHS 10 20 30 4 5 6 � 8 9 1 0
B-7
M -A

i
-E
-F
2" X 2" WOOD STAKES OR
1.25 #/FT STEEL POST --j
2' SPACING
(TYPICAL)
CONTINUOUS
ALONG TUBE
2 3 4 5 6 7 8
0
3�1
J
ILL.
SEDIMENT TUBE INSTALLATION
SEDIMENT TUBE SPACING
SLOPE
MAX. SEDIMENT TUBE SPACING
LESS THAN 2%
150 -FEET
2%
100 -FEET
3%
75 -FEET
4%
50 -FEET
5%
40 -FEET
6%
30 -FEET
GREATER THAN 6%
25 -FEET
SEDIMENT TUBES - GENERAL NOTES:
1. SEDIMENT TUBES MAY BE INSTALLED ALONG
CONTOURS, IN DRAINAGE CONVEYANCE CHANNELS,
AND AROUND INLETS TO HELP PREVENT OFF-SITE
DISCHARGE OF SEDIMENT -LADEN STORMWATER
RUNOFF.
2. SEDIMENT TUBES ARE ELONGATED TUBES OF
COMPACTED GEOTEXTILES, CURLED EXCELSIOR WOOD,
NATURAL COCONUT FIBER, OR HARDWOOD MULCH.
STRAW, PINE NEEDLE, AND LEAF MULCH -FILLED
SEDIMENT TUBES ARE NOT PERMITTED,
3. THE OUTER NETTING OF THE SEDIMENT TUBE
SHOULD CONSIST OF SEAMLESS, HIGH-DENSITY
POLYETHYLENE PHOTODEGRADABLE MATERIALS
TREATED WITH ULTRAVIOLET STABILIZERS OR A
SEAMLESS, HIGH-DENSITY POLYETHYLENE
NON -DEGRADABLE MATERIAL.
4. SEDIMENT TUBES, WHEN USED AS CHECKS WITHIN
CHANNELS, SHOULD RANGE BETWEEN 18 INCHES
AND 24 INCHES DEPENDING ON CHANNEL
DIMENSIONS. DIAMETERS OUTSIDE THIS RANGE MAY
BE ALLOWED WHERE NECESSARY WHEN APPROVED.
5. CURLED EXCELSIOR WOOD, OR NATURAL COCONUT
PRODUCTS THAT ARE ROLLED UP TO CREATE A
SEDIMENT TUBE ARE NOT ALLOWED.
6. SEDIMENT TUBES SHOULD BE STAKED USING
WOODEN STAKES (2 -INCH X 2 -INCH) OR STEEL
POSTS (STANDARD "U" OR "T" SECTIONS WITH A
MINIMUM WEIGHT OF 1.25 POUNDS PER FOOT) AT A
MINIMUM OF 48 INCHES IN LENGTH PLACED ON
2 -FOOT CENTERS.
7. INSTALL ALL SEDIMENT TUBES TO ENSURE THAT NO
GAPS EXIST BETWEEN THE SOIL AND THE BOTTOM
OF THE TUBE. MANUFACTURER'S RECOMMENDATIONS
SHOULD ALWAYS BE CONSULTED BEFORE
INSTALLATION.
8. THE ENDS OF ADJACENT SEDIMENT TUBES SHOULD
BE OVERLAPPED 6 INCHES TO PREVENT FLOW AND
SEDIMENT FROM PASSING THROUGH THE FIELD
JOINT.
9. SEDIMENT TUBES SHOULD NOT BE STACKED ON TOP
OF ONE ANOTHER, UNLESS RECOMMENDED BY
MANUFACTURER.
10, EACH SEDIMENT TUBE SHOULD BE INSTALLED IN A
TRENCH WITH A DEPTH EQUAL TO 1/5 THE
DIAMETER OF THE SEDIMENT TUBE.
11, SEDIMENT TUBES SHOULD CONTINUE UP THE SIDE
SLOPES A MINIMUM OF 1 FOOT ABOVE THE DESIGN
FLOW DEPTH OF THE CHANNEL.
12, INSTALL STAKES AT A DIAGONAL FACING INCOMING
RUNOFF.
NOTES:
1. CHECK DAMS MAY BE USED IN SLOPING DITCHES
OR CHANNELS TO SLOW VELOCITY OR TO CREATE
SEDIMENT TRAPS.
2. ENSURE THAT MAXIMUM SPACING BETWEEN DAMS
STAKES PLACED PLACES THE TOE OF THE UPSTREAM DAM AT THE
AT 2' MINIMUM SAME ELEVATION AS THE DOWNSTREAM DAM (SEE
SPACING PROFILE BELOW).
3. A AND B ARE AT EQUAL ELEVATIONS. NCDOT
CLASS B RIPRA
ll��.; ����eiltrs
"ill:_PLAN SYMBOL
SEDIMENT TUBES - INSPECTION & MAINTENANCE:
1. THE KEY TO FUNCTIONAL SEDIMENT TUBES IS
WEEKLY INSPECTIONS, ROUTINE MAINTENANCE, AND
REGULAR SEDIMENT REMOVAL,
2. REGULAR INSPECTIONS OF SEDIMENT TUBES SHALL
BE CONDUCTED ONCE EVERY CALENDAR WEEK
AND, AS RECOMMENDED, WITHIN 24 HOURS AFTER
EACH RAINFALL EVEN THAT PRODUCES 1/2 INCH
OR MORE OF PRECIPITATION.
3. ATTENTION TO SEDIMENT ACCUMULATIONS IN
FRONT OF THE SEDIMENT TUBE IS EXTREMELY
IMPORTANT. ACCUMULATED SEDIMENT SHOULD BE
CONTINUALLY MONITORED AND REMOVED WHEN
NECESSARY.
4. REMOVE ACCUMULATED SEDIMENT WHEN IT
REACHES 113 THE HEIGHT OF THE SEDIMENT
TUBE.
5. REMOVED SEDIMENT SHALL BE PLACED IN
STOCKPILE STORAGE AREAS OR SPREAD THINLY
ACROSS DISTURBED AREA. STABILIZE THE REMOVED
SEDIMENT AFTER IT IS RELOCATED.
6. LARGE DEBRIS, TRASH, AND LEAVES SHOULD BE
REMOVED FROM IN FRONT OF TUBES WHEN
FOUND.
7. IF EROSION CAUSES THE EDGES TO FALL TO A
HEIGHT EQUAL TO OR BELOW THE HEIGHT OF THE
SEDIMENT TUBE, REPAIRS SHOULD BE MADE
IMMEDIATELY TO PREVENT RUNOFF FROM
BYPASSING TUBE.
8. SEDIMENT TUBES SHOULD BE REMOVED AFTER THE
CONTRIBUTING DRAINAGE AREA HAS BEEN
COMPLETELY STABILIZED. PERMANENT VEGETATION
SHOULD REPLACE AREAS FROM WHICH SEDIMENT
TUBES HAVE BEEN REMOVED.
SEDIMENT TUBE DETAIL
SCALE. NOT TO SCALE
q MAXIMUM SPACING B
.III=III_ =III=III_III_111_111=111_111=II_111=111=111_
111_111=III=
PROFILE
12" OF #57
I ILI LI\ VLVIII
SECTION
A
------------------- I-III=III=11.
III=N!=11'=111=
III -1111-
1)I_
III =1„
FILTER CLOTH
111= =11= III=111=
- 111=h1=III-a, III -III=„ I -1.,= „=11-111=_III-III-11'=
111= q1=11�_III-1111-11u=h'=1ji=11'=111=jj1=ql=
A
ELEVATION (LOOKING UPSTREAM)
MAINTENANCE:
1. INSPECT CHECK DAMS AND CHANNELS AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT (1/2"
OR GREATER) RAINFALL EVENT AND REPAIR IMMEDIATELY. CLEAN OUT SEDIMENT, STRAW, LIMBS,
OR OTHER DEBRIS THAT COULD CLOG THE CHANNEL WHEN NEEDED.
2. ANTICIPATE SUBMERGENCE AND DEPOSITION ABOVE THE CHECK DAM AND EROSION FROM HIGH
FLOWS AROUND THE EDGES OF THE DAM. CORRECT ALL DAMAGE IMMEDIATELY.
3. REMOVE SEDIMENT ACCUMULATED BEHIND THE DAMS AS NEEDED TO PREVENT DAMAGE TO
CHANNEL VEGETATION, ALLOW THE CHANNEL TO DRAIN THROUGH THE STONE CHECK DAM, AND
PREVENT LARGE FLOWS FROM CARRYING SEDIMENT OVER THE DAM. ADD STONES TO DAMS AS
NEEDED TO MAINTAIN DESIGN HEIGHT AND CROSS SECTION.
ROCK CHECK DAM DETAIL r
SCALE: NOT TO SCALE 0103-007
0103-012
0103-022
0103-025
0103-026
0103-027
NCDOT CLASS B RIPRAP
- 12" OF #57 NCDOT
WASHED STONE
FLOW
NON -WOVEN GEOTEXTILE FABRIC
MAINTENANCE NOTES:
1. INSPECT AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT RAINFALL EVENT
(AS DEFINED BY NCDEQ) AND REPAIR IMMEDIATELY,
2, SEDIMENT TO BE REMOVED WHEN ACCUMULATIONS REACH 1/3 OF
HEIGHT OF BERM.
3. REMOVE AND REPLACE NCDOT #5 OR #57 WASHED STONE WHEN IT
BECOMES CLOGGED WITH SEDIMENT.
GRAVEL FITLER BERM DETAIL
SCALE: NOT TO SCALE 0103-008
0103-028
COMPACTED
SOIL --,-
2' MIN
CCL -0105-007
NOTES:
1. CONSTRUCT TEMPORARY DIVERSION AS SPECIFIED IN THE DIVERSION DITCH TABLE
ON CCL -0105-012 WHERE DEPTH, SIDE SLOPE, BASE WIDTH AND PROPOSED
LINING ARE PROVIDED, USE THE ABOVE DETAIL FOR DESIGN SPECIFICATIONS NOT
NOTED IN THE TABLE OR WHERE ADDITIONAL TEMPORARY DIVERSION DITCHES MAY
BE NEEDED BUT NOT IDENTIFIED. SEED AND MULCH BERM.
2. SIDE SLOPES SHALL NOT EXCEED A 5:1 (H:V) SLOPE IN AREAS WHERE VEHICLES
MUST CROSS, 2:1 SLOPE (MAX) IN ALL OTHER AREAS.
3. ALL DIVERSION DITCHES SHALL BE VEGETATED AND MAINTAINED TO HAVE A FULL
STAND OF TALL FESCUE GRASS COVER. WHERE GRASS COVER IS NOT PROVIDED,
THE AREAS SHALL BE RESEEDED OR REPAIRED TO MAINTAIN FULL COVER OR
PROVIDE OTHER COMPARABLY PERFORMING DITCH LINING,
TEMPORARY DIVERSION DITCH DETAIL
SCALE: NOT TO SCALE
COMPOST SOCK
3"
FLOW- AREA TO BE
- - - PROTECTED
"�1i1=IIEIII- IIEI11=11E111=11=
-' ��1=111=i = =III III-III=III=11- - ' • .
"�-1TG1 � 1=III -111{,1 l III -I I E
2,> X 2"
STAKES
SECTION B
WOOD MULCH OR
COMPOST TO
1/2 HEIGHT OF LOG
iYv I I
ITk� -1 � IIT1-11 _ WI
"P311, i 1=1 =
-�11- _ B
"-11 1=
I
UNTRENCHED INSTALLATION
31' COMPOST SOCK
FLOW- AREA TO BE
=1Ti=TEIT-1�1-1�PROTECTED
_-�11111gi1=11gIL=11L=11 L= • • •
-"-"'-111=111=IIITIII-III I
2" X 2"
STAKES
SECTION G
TRENCH INTO
GROUND 4" MIN
GENERAL NOTES:
M_1
1. FOR GENERAL NOTES SEE
CCL -0100-004.
FOR DRAWING INDEX SEE
CCL -0100-001.
FOR ABBREVIATIONS SEE
CCL -0100-002
FOR LEGEND AND SYMBOLS SEE
CCL -0100-003,
NOTE: THIS APPLICATION MAY NOT BE USED WITH
COMPOST SOCKS SMALLER THAN 12",
ENTRENCHED INSTALLATION
0
_J
MULCH OR COMPOST LL WORK
FOR UNTRENCHED SOCKS w AREA
w
COMPOST SOCK
AREA TO BE
PROTECTED
PLAN
NOTES:
1. INSTALL COMPOST SOCKS ALONG LEVEL CONTOUR PERPENDICULAR TO STORMWATER FLOW TO ASSIST IN DISSIPATING LOW CONCENTRATED
FLOW INTO SHEET FLOW AND REDUCING RUNOFF VELOCITY.
2. COMPOST SOCKS SHALL BE A MINIMUM OF 12" DIAMETER UNLESS OTHERWISE NOTED.
3. STAKES SHALL BE MADE OF OAK OR OTHER DURABLE HARDWOOD.
4. PLACE COMPOST SOCKS END TO END AND JOIN ENDS SLEEVING ONE SOCK END INTO ANOTHER.
5. IN ORDER TO PREVENT WATER FLOWING AROUND THE ENDS OF THE COMPOST SOCK, THE ENDS OF THE SOCK MUST BE CONSTRUCTED
POINTING UPSLOPE SO THE ENDS ARE AT A HIGHER ELEVATION. A MINIMUM OF 10 LINEAR FEET AT EACH END PLACED AT AN ANGLE OF
30• IS RECOMMENDED.
MAINTENANCE:
INSPECT COMPOST SOCKS WEEKLY AND AFTER EACH SIGNIFICANT RAINFALL EVENT (AS DEFINED BY NCDEQ). REMOVE ACCUMULATED SEDIMENT
AND ANY DEBRIS. THE COMPOST SOCK MUST BE REPLACED IF CLOGGED OR TORN. IF PONDING BECOMES EXCESSIVE THE SOCK MAY NEED TO
BE REPLACED WITH A LARGER DIAMETER OR A DIFFERENT MEASURE. THE SOCK NEEDS TO BE REINSTALLED IF UNDERMINED OR DISLODGED. THE
COMPOST SOCK SHALL BE INSPECTED UNTIL LAND DISTURBANCE IS COMPLETE AND THE AREA ABOVE THE MEASURE HAS BEEN PERMANENTLY STABILIZED.
COMPOST SOCK DETAIL r5
SCALE: NOT TO SCALE 0103-002
0103-004 0103-024
0103-005 0103-025
0103-007 0103-027
0103-022
PRELIMINARY
NOT FOR
F)l CONSTRUCTION
OR
HDR Engineering, Inc. of the Carolinas License Number: F-0116 RECORDING I A I ISSUEFD FOR BIDS.
440 S Church Street, Suite 1000 Charlotte, NC 28202-2075 PE SEAL N0. DATE
INCHES 1 2 3 TENTHS 10 20 30 4 5 6 7
I 1 1 1
TITLE
AUXILIARY SPILLWAY
EROSION AND SEDIMENT CONTROL
DETAILS
FOR
CEDAR CLIFF IDF & SPILLWAY UPGRADE
DUKE SCALE: AS NOTED DES: MGL
DWG TYPE: DGN DFTR: JTTD
DATEN0:10060948 CHKD:ENER(10�.3`1(��
FILENAME: CCL-0105-007.DGN APPD:
DWG SIZE DRAWING NO. REVISION
JTTD MGL - - ANSI D
22.0"x34.0" CCL -0105-007 A
REVISION DFTR DES CHKD APPD
8 9 10
I I B-8
M -A

D'1
2 3
La
(FT)
4
5
6
7 8
D50 RIPRAP
SIZE (IN)
' W2
-
11.5
-
-
NOTES:
1. CLASS OR MEDIAN SIZE OF RIPRAP AND LENGTH,
WIDTH AND DEPTH OF APRON TO BE SHOWN ON
PLANS.
2. RIPRAP SHOULD EXTEND UP BOTH SIDES OF THE
APRON AND AROUND THE END OF THE PIPE OR
CULVERT AT THE DISCHARGE OUTLET AT A MAXIMUM
SLOPE OF :1 AND A HEIGHT NOT LESS THAN TWO
THIRDS THE PIPE DIAMETER OR CULVERT HEIGHT.
3. THERE SHALL BE NO OVERFLOW FROM THE END OF
THE APRON TO THE SURFACE OF THE RECEIVING
CHANNEL. THE AREA TO BE PAVED OR RIPRAPPED
SHALL BE UNDERCUT SO THAT THE INVERT OF THE
APRON SHALL BE AT THE SAME GRADE (FLUSH) WITH
THE SURFACE OF THE RECEIVING CHANNEL. THE
APRON SHALL HAVE A CUTOFF OR TOE WALL AT THE
DOWNSTREAM END.
4. THE WIDTH OF THE END OF THE APRON SHALL BE
EQUAL TO THE BOTTOM WIDTH OF THE RECEIVING
CHANNEL. MAXIMUM TAPER TO RECEIVING CHANNEL
5:1.
5. ALL SUBGRADE FILL FOR STRUCTURE TO BE
COMPACTED TO 95% OF THE STANDARD PROCTOR
MAXIMUM DRY DENSITY OR TO THE DENSITY OF THE
SURROUNDING UNDISTURBED MATERIAL.
6. THE PLACING OF FILL, EITHER LOOSE OR COMPACTED,
IN THE RECEIVING CHANNEL SHALL NOT BE ALLOWED.
7. NO BENDS OR CURVES IN THE HORIZONTAL
ALIGNMENT OF THE APRON UNLESS OTHERWISE
SHOWN.
8. TYPE 1 GEOTEXTYLE FILTER FABRIC SHALL BE
INSTALLED ON COMPACTED SUBGRADE PRIOR TO
PLACEMENT OF RIPRAP.
9. ANY DISTURBED AREA FROM END OF APRON TO
RECEIVING CHANNEL MUST BE STABILIZED.
END OF FLARED
SECTION
NATURAL GRADE
n % ci nPF
1' MIN
MIN � \
TYPE 1 GEOTEXTILE
FILTER FABRIC LAP (IFN
ELEVATION %
NOTE:
MINIMUM H=2/3
PIPE DIAMETER
T (THICKNESS)
_ T = 1./XDMAX
GEOTEXTILE FILTER FABRIC
SECTION B
NOTE:
USE USDA NOMOGRAPH FROM NC SEDIMENT AND EROSION CONTROL MANUAL.
OUTLET
La
(FT)
W1
(FT)
W2
(FT)
*T
(IN)
H
(IN)
D50 RIPRAP
SIZE (IN)
HW Al
10.0
11.5
4.5
13.5
12
6
HW A2
16.0
18.0
6.0
13.5
16
6
*D50 (SEE FIG 8.06 A&B "NC SEDIMENT AND EROSION CONTROL MANUAL"
DMAX = 1.5 * D50
T = 1.5 * DMAX
T(MIN) = 10"
RIPRAP APRON AT PIPE OUTFALL DETAIL
SCALE: NOT TO SCALE 0103-022
SILT FENCE AS NEEDED
FILTER MEDIA (SEE NOTE 2)
/--- PUMP
FLOW
VEGETATIVE BUFFER I
NOTES:
1, PRIOR TO INSTALLATION, MANUFACTURER SPECIFICATIONS OF FILTER
MEDIA SHALL BE PROVIDED TO THE EROSION CONTROL INSPECTOR
FOR APPROVAL AND USE. DISCHARGE FROM FILTER MEDIA SHALL MEET
OR EXCEED THE PROVISIONS OF THE CLEAN WATER ACT.
2, ENSURE THAT PUMP PRESSURE DOES NOT EXCEED FILTER MEDIA
PRESSURE RATING.
3, FILTER MEDIA MAY BE, BUT NOT LIMITED TO, SAND MEDIA FILTRATION
DEVICES, RATED FILTER FABRIC BAGS OR POLYMER BASED
DEWATERING PRACTICES.
4, PUMP STRAINER SHALL NOT BE IN CONTACT WITH BOTTOM OF POND.
EROSION CONTROL DEWATERING DETAIL 3
SCALE: NOT TO SCALE 0105-001
WATER LEVEL
TEMPORARY
FLEXIBLE HOSE
SEDIMENT BAG TOP OF BANK
(TIE TO TEMPORARY
(SEE NOTE 2) CTA SII 17Cn nl ITI CTN
FILTER FABRIC TYPE 2
SEDIMENT REMOVAL DEVICE
APPROXIMATE
BASE FIOW
WATER
TOP OF BANK
TrLAnnnnnv
OSE
�T BAG
TEMPORARY STABILIZED OUTLET SECTION
FLOW
IMPERVIOUS DIKE
(SEE nInTU Q\
0
APPROXIMATE BASE '7 -
FLOW WATER LEVEL 0
(6") BASE FLOW + 1'
(2' MIN)
SANDBAG/STONE
_ (CLASS A) (SEE NOTE 8)
FLOW WORKING AREA
I/R`IMPERVIOUS MEMBRANE
TYPE 2
IMPERVIOUS DIKE DETAIL
NOTES:
1. SEDIMENT FILTER BAG FABRIC SHALL BE GEOTEXTILE MANUFACTURED FROM WOVEN
POLYPROPYLENE OR POLYMER MATERIAL. SEDIMENT FILTER BAG FABRIC MAY BE MADE
FROM RECYCLED POLYMER MATERIALS. POLYMER MATERIALS SHALL NOT CONTAIN
BIODEGRADABLE FILLER MATERIALS AND SHALL CONFORM TO THE REQUIREMENTS IN
ASTM DESIGNATION: E 204
3. THE SEDIMENT FILTER BAG SHALL BE 10'X12'X1.5' (MIN) AND SHALL BE COMPLETE WITH LIFTING LOOPS
AND DUMP STRAPS ATTACHED AT THE BOTTOM TO FACILITATE EMPTYING OF THE SEDIMENT FILTER BAG.
4. LIFTING STRAPS SHOULD BE PLACED UNDER THE DEWATERING SEDIMENT FILTER BAG TO FACILITATE
REMOVAL AFTER USE.
5. PLACE THE DEWATERING SEDIMENT FILTER BAG ON A LEVEL STABILIZED AREA OVER DENSE
VEGETATION/STRAW, OR GRAVEL (IF INCREASED DRAINAGE SURFACE AREA IS NEEDED).
6. INSERT DISCHARGE HOSE FROM PUMP INTO THE DEWATERING SEDIMENT FILTER BAG A MINIMUM OF 6
INCHES AND TIGHTLY SECURE WITH ATTACHED STRAP TO PREVENT WATER FROM FLOWING OUT OF THE
UNIT WITHOUT BEING FILTERED.
7. REPLACE THE UNIT WHEN 1/2 FULL OF SEDIMENT OR WHEN SEDIMENT HAS REDUCED THE FLOW RATE
OF THE PUMP DISCHARGE TO AN IMPRACTICAL RATE.
8. REMOVE THE UNIT AND SEDIMENT FROM ENVIRONMENTALLY SENSITIVE AREA AND WATERWAYS. AT THE
APPROVED DISPOSAL SITE, OPEN OR SLIT THE UNIT, REMOVE SEDIMENT AND GRADE SMOOTHLY INTO
EXISTING TOPOGRAPHY. DISPOSE OF THE DEWATERING SEDIMENT FILTER BAG, AT AN APPROPRIATE
RECYCLING OR SOLID WASTE FACILITY.
DEWATERING SEDIMENT FILTER BAC DETAIL
SCALE: NOT TO SCALE 0105-001
-� --� ---� ---� SILT FENCE
ill=III-III= III=III =III=III-III-III=III=III=� SEE DETAIL
TIN
I
-llllllilll�ll'-�Ilill11- 2\CCL-0105-005
Ln 1111= .
10" (TYP) 3 =111111; SOIL/SEDIMENT 1111=
-III STOCKPILE AREA z 'I-111=
- 3
1 -I 11-' ' 11 = 1
x III I-
_� ' Q I
ORIGINAL GROUND SURFACE
/ 1' NOTES:
1. SILT FENCE TO EXTEND AROUND ENTIRE PERIMETER OF STOCKPILE, OR IF
STOCKPILE AREA IS LOCATED ON/NEAR A SLOPE, THE SILT FENCE IS TO EXTEND
ALONG CONTOURS OF THE DOWN -GRADIENT AREA,
2. IF STOCKPILE IS TO REMAIN FOR MORE THAN 14 DAYS, TEMPORARY STABILIZATION
LOW POINT MEASURES MUST BE IMPLEMENTED.
3. SILT FENCE SHALL BE MAINTAINED UNTIL STOCKPILE AREA HAS EITHER BEEN
REMOVED OR PERMANENTLY STABILIZED.
4. THE KEY TO FUNCTIONAL TEMPORARY STOCKPILE AREAS IS WEEKLY INSPECTIONS,
ROUTINE MAINTENANCE, AND REGULAR SEDIMENT REMOVAL.
5. TEMPORARY STOCKPILE TO HAVE A MAXIMUM HEIGHT OF 15'
TEMPORARY STOCKPILE E&SC DETAIL 4
SCALE: NOT TO SCALE 0105-001
PRELIMINARY
NOT FOR
CONSTRUCTION
F)l OR
B ISSUED FOR BIDS.
HDR Engineering, Inc. of the Carolinas License Number: F-0116 RECORDING
A 3/13/2019 ISSUED FOR BIDS.
440 S Church Street, Suite 1000 Charlotte, NC 28202-2075 PE SEAL NO. DATE
INCHES 1 2 3 TENTHS 10 20 30 4 5 6 7
I I 1 1
TEMPORARY `
FLEXIBLE
HOSE
DEWATERING PUMP
1
I
I
J�
I
CCL -0105-008
IREv.
B
GENERAL
NOTES:
DES: MGL
1. FOR
GENERAL NOTES SEE CCL -0100-004.
DFTR: JTTD
FOR
DRAWING INDEX SEE CCL -0100-001.
FOR
ABBREVIATIONS SEE CCL -0100-002.
DATEN0:10060948
FOR
CCL
LEGEND AND SYMBOLS SEE
-0100-003.
FILENAME: CCL-0105-008.DGN
'N
CLEAN WATER V B
PUMP -AROUND PUMP
/-- TEMPORARY FLEXIBLE HOSE
EXISTING CHANNEL
IMPERVIOUS DIKE
(SEE DETAIL, THIS
DRAWING)
SEDIMENT REMOVAL DEVICE 6' TEMPORARY STABILIZED OUTLET
SEE DETAIL 2 ON THIS DRAWING SEE DETAIL 2 ON THIS DRAWIN
i
PLAN VIEW
NOTES:
1. ALL CHANNEL WORK INVOLVING EXCAVATION SHALL BE PERFORMED IN DRY
CONDITIONS OR IN CHANNEL SECTIONS ISOLATED BY IMPERVIOUS DIKES AND
KEPT DE -WATERED.
2. THE CONTRACTOR SHALL NOT DISTURB MORE AREA THAN CAN BE STABILIZED
THE SAME WORKING DAY.
3. PUMP -AROUND PUMP AND HOSE SHALL ADEQUATELY CONVEY BASEFLOW
(CONTRACTOR TO VERIFY). DE -WATERING PUMP SHALL ADEQUATELY DE -WATER
THE WORKING AREA AT THE DOWNSTREAM IMPERVIOUS DIKE.
4. GRAVITY -BASED GEOTEXTILE BAG FILTERS SHALL BE USED TO COLLECT SILT AND
SEDIMENT FROM WORK AREA DE -WATERING. THE DESIGNER MAY SPECIFY A
SEDIMENT BASIN OR OTHER SEDIMENT CONTROL MEASURE IN LIEU OF A
SEDIMENT BAG IF SITE CONDITIONS ARE FAVORABLE (I.E. - TREES WILL NOT BE
IMPACTED FOR BASIN EXCAVATION, ETC.).
5. EFFLUENT FROM CLEAN WATER PUMP AROUND MAY BE DISCHARGED DIRECTLY
INTO STABILIZED OUTLET (NO SEDIMENT REMOVAL DEVICE REQUIRED).
6. A STABILIZED OUTLET SHALL BE USED TO CONTROL THE EFFLUENT FROM ALL
PUMPING OPERATIONS, THE DESIGNER SHALL SPECIFY ALL MATERIALS AND
DIMENSIONS ASSOCIATED WITH STABILIZED OUTLETS,
7. FILTER FABRIC AS SPECIFIED BY THE DESIGNER SHALL BE USED UNDERNEATH
ALL STONE/RIP RAP PLACED FOR SEDIMENT BAGS, STABILIZED OUTLETS, SPLASH
PADS.
8. IMPERVIOUS DIKES SHALL BE CONSTRUCTED TO ISOLATE THE IN -STREAM
WORKING AREA, AN IMPERVIOUS FABRIC MEMBRANE AND SAND BAGS OR STONE,
AS SPECIFIED BY THE DESIGNER, SHALL BE USED TO CREATE THE DIKES,
9. THE WORK SEQUENCE IN PUMP -AROUND OPERATIONS PROCEEDS TYPICALLY AS
FOLLOWS:
A. INSTALL SEDIMENT REMOVAL DEVICE AND TEMPORARY STABILIZED OUTLETS
AT THE DOWNSTREAM END OF WORKING AREA.
B. INSTALL PUMP -AROUND PUMP AND FLEXIBLE HOSE,
C. INSTALL UPSTREAM IMPERVIOUS DIKE AND BEGIN PUMPING (CLEAN WATER)
DOWNSTREAM TO STABILIZED OUTLET.
D. INSTALL DOWNSTREAM IMPERVIOUS DIKE AND DE -WATERING PUMP.
E. PERFORM CHANNEL WORK IN ACCORDANCE WITH THE PLANS IN THE
WORKING AREA.
F. DE -WATER THE WORKING AREA (AS NEEDED) INTO THE SEDIMENT REMOVAL
DEVICE AND TEMPORARY STABILIZED OUTLET.
G. UPON COMPLETION OF WORK, REMOVE ANY SEDIMENT ACCUMULATION
BEHIND IMPERVIOUS DIKES.
H. REMOVE DOWNSTREAM AND THEN UPSTREAM DIKES AND ALL PUMPS AND
HOSE.
I. SEED AND MULCH ALL DISTURBED AREAS PER THE PLANTING PLAN.
PUMP -AROUND DETAIL 1�
SCALE: NOT TO SCALE 0103-012
TITLE
AUXILIARY SPILLWAY
EROSION AND SEDIMENT CONTROL
DETAILS
a
FOR
CEDAR CLIFF IDF & SPILLWAY UPGRADE
DUKE
SCALE: AS NOTED
DES: MGL
DWG TYPE: DGN
DFTR: JTTD
CHKD:ENER(10�.3`1(��
DATEN0:10060948
FILENAME: CCL-0105-008.DGN
APPD:
DWG SIZE
DRAWING NO.
REVISION
JTTD MGL
ANSI D
22.0"x34.0"
CCL -0105-008
B
JTTD MGL - -
REVISION DFTR DES CHKD APPD
8 9 10
a

B-1 0

Cedar Cliff Hydroelectric Development Auxiliary Spillway Upgrade Project
Proposed Duke Energy Water Quality Monitoring Plan
Project Overview
In 2014, the FERC established the Inflow Design Flood (IDF) for Cedar Cliff development as
the Probable Maximum Flood (PMF). Prior to the FERC notice, the OF had been 40
percent of the PMF. The existing spillway discharge capacity is insufficient to pass the PMF
without overtopping the dam and resulting in potential failure of the structure. Engineering
design efforts are underway to expand the existing auxiliary spillway (width and depth) and
install Hydroplus-Fusegates as the control section. In addition, the existing parapet wall will
be replaced with a PMF Wall to create additional storage for the Cedar Cliff
reservoir. Studies have indicated the expanded auxiliary spillway, Fusegates, and PMF
Wall provide the necessary measures to safely pass the OF without overtopping Cedar Cliff
Dam.
The construction project is scheduled to begin July, 2019 and be completed December,
2020. The present plan specifies excavating material (approximately 283,200 cubic yards)
from the mountain hillside east of the current fuse plug (Figure 1). A gravel filter berm at the
lower end of the auxiliary spill channel will provide sediment and erosion control from the
excavations.
During construction, the lake will be lowered 30 ft to accommodate the construction activities
including staging the excavated material on the foot print of the existing fuse plug approach
channel. The excavated material will be loaded onto barges and spoiled into Cedar Cliff
Lake upstream of the dam (Figure 2) (for discussion and review of submerged disposal, see
HDR 2018a). As specified in the USACE 404/401 permit, a 3-5 ft floating turbidity barrier will
be installed at all work areas that are in, or adjacent to surface waters.
As discussed by HDR (2018a), pyrite (FeS2) was identified in rock exposures at the site and
in the rock core from boreholes drilled for the subsurface investigation (HDR 2017).
Subsequent petrographic analyses of metasedimentary rocks of the Tallulah Falls Formation
(TFFm) collected from the rock cores found that the garnet mica schist, mica schist, and
schistose biotite gneiss lithologies contained 2 percent to 7 percent pyrite by volume (HDR
2017). Based on the boreholes drilled during the geological/ geotechnical site investigation
for the Auxiliary Spillway upgrades, approximately 26 percent of the total excavated material
(73,600 cubic yards) will be made up of these three rock lithologies.
Even though there are no known instances of acid -drainage related to the metasedimentary
rocks of the TFFm in the region surrounding the site; rocks with greater than 1 percent pyrite
and/or pyrrhotite by volume are considered to be potentially acid -producing. Pyrite can react
in the presence of atmospheric oxygen and water to form ferrous sulfate and sulfuric acid
(2FeS2 + 702 + 2H2O -> 2FeSO4 + 2H2SO4). The stoichiometry of complete oxidation of one
mole of pyrite would produce 4 equivalents of hydrogen ions. Although some acid -drainage
is produced by natural weathering, construction activities can expose large volumes of rock
containing sulfide minerals to oxidizing conditions. The oxidation of pyrite and subsequent
acid production increase significantly when exposed to atmospheric oxygen and particle size
becomes smaller and smaller (Pugh et.al. 1984). Subsequent leaching of the oxidation
products by rainfall/groundwater result in the formation of acid drainage which is
B-11

Proposed Duke Energy Monitoring Plan
characterized by low pH values, high concentrations of sulfate, and mobilization of metals
such as iron, aluminum, and manganese.
Bosch and Meckenstock (2012) have suggested anaerobic nitrate -dependent microbial
pyrite oxidation may also contribute to acid production. Geochemical and stable isotope field
data from anaerobic aquifers indicate that denitrification was associated with pyrite
oxidation. Laboratory studies were more ambiguous, but suggested that this process may
occur under some conditions. The molecular mechanism of pyrite oxidation coupled with
denitrification is not well understood.
Factors affecting the amount of Acid -Production
• Percent Pyrite in Rock
• Morphology and grain size of the iron sulfide minerals
• Particle size of excavated material (surface area of disturbed or spoiled rock)
• Presence of certain iron bacteria (primarily Thiobacillus ferrooxidans)
• Presence of alkalinity producing material
• Oxygen concentration
• Nitrate
In addition to the factors affecting the amount of acid production, the characteristics of
Cedar Cliff Reservoir (Table 1) also influence the amount of oxidation products in the
reservoir and downstream reaches. For example, the wide range of pH values reflected the
poor buffering capacity of the low alkalinity water as biological activity metabolized carbon
dioxide. In addition, the very low ionic strength, as measured by conductivity, also influenced
the ability to measure accurate pH values as well as indicating the poor buffering capacity.
The relatively high oxygen concentrations in the lake would favor higher rates of pyrite
oxidation, but these rates would be very low compared to exposure to atmospheric oxygen.
The low nitrate concentrations would limit the amount of de -nitrification associated with
anaerobic nitrate -dependent microbial pyrite oxidation. Probably the most significant factor
limiting the accumulation of pyrite oxidation products in the lake is the very high flushing rate
of the reservoir (Table 1). The average retention time of the water at full pool is 15.3 days;
at a 30 foot drawdown the average retention time of the water is reduced to 8.1 days. Also,
at the 30 foot drawdown, the only way to maintain the lake level is by the hydro operation,
which draws water from the bottom of the lake further reducing the accumulation of
oxidation products in the lake.
Even though HDR (2017), HDR (2018a), and HDR (2018b) have discussed the project in
detail and have projected minimum, if any, acidification impacts from pyrite oxidation, and
the lake characteristics also suggest a lack of accumulation of acidic water, the potential
does exist for an alteration of the water quality. The proposed monitoring program is
designed to assess any direct changes in water quality due to pyrite oxidation.
Page 2 of 8
B-12

Proposed Duke Energy Monitoring Plan
Table 1. Cedar Cliff Reservoir Characteristics
Parameter Units
Full Pond (Spillway Elevation)
2330 ft-msl
Tainter Gate Elevation
2305 ft-msl
30 Foot Drawdown Elevation
2300 ft-msl
Cedar Cliff Hydro intake Elevation
2202 ft-msl
Proposed Elevation of Top of Rock Spoil
2250 ft-msl
Lake Volume below Full Pond
6320 ac -ft
Lake Volume below Tainter Gate
3742 ac -ft
Lake Volume below 30 foot drawdown
3386 ac -ft
Lake Volume below hydro intake
42 ac -ft
Mean Outflow'
209.0 cfs
Mean Retention Time (full pond)
15.3 days
Mean Retention Time (30 foot drawdown)
8.1 days
Max Depth at Dam (full pond)
148 ft
Max Depth mid -lake sampling (full pond)
106 ft
pH range2
5.7-8.0
Mean Alkalinity2
0.13 meq/1
Conductivity Rangel
14-20 uSi
Mean Oxygen below 2250 ft-ms12
7.8 mg/l
Minimum observed oxygen2
4.2 mg/l
Mean Nitrate2
0.019 mg/l
1 Calculated from Cedar Cliff operations (1953-2013)
2 from NCDENR data reported in NP&L (2000)
Figure 1. Cedar Cliff Spill Channels and Proposed Excavation and Construction Areas with
Proposed Water Quality Sampling Sites (pink circles)
Page 3 of 8
B-13

Proposed Duke Energy Monitoring Plan
Figure 2. Bathymetric Map of Cedar Cliff Reservoir Showing the Proposed Spoil Areas, the Hydro Intake, and the Downstream
Reach with Proposed Water Quality Sampling Sites (red circles)
i Ii ceaarcUT;3DwemouseTunnel inlet Cedar Cliff Lake $athymetry
010 -Foot C oatows
I I I I I{ I I i I i i i i i i i i I h ��,a„QL aye n LS E— hG MM.
:o3-Jrab S-%mLr'?;o .Ca " Stat Pae NNMB UE 8w&Y Pool htWCrnher X9:5
Page 4 of 8
B-14

Proposed Duke Energy Monitoring Plan
Cedar Cliff Monitoring Rationale
Most environmental monitoring programs directly assess water quality or employ various
indices for biological impacts, usually macroi nve rte b rates in streams. The proposed
water quality assessment is designed to directly address the potential impact of the rock
spoil in the reservoir, the spill channel, and the Tuckasegee River below the excavation
site.
The biological communities, particularly macro -invertebrates, are influenced by many
factors and rarely exhibit a direct cause and effect of a perturbation. He et.al. (2015),
Svitok et.al. (2014), Gray and Delaney (2008), and DeNicola and Stapleton (2016) have
reviewed the use of macro -invertebrate communities to assess acid mine drainage with
mixed results. Unless the pH was extremely low or significant iron oxide precipitation
was covering the substrates, many diversity indices, biological integrities, density and
taxonomic diversities, and various community metrics applied to macroinvertebrate
populations showed highly variable results in streams with acid -mine drainage.
The NCDENR (2011) reported good to excellent benthic communities in streams with
low pH (mean 5.98, range 5.4-6.9). These data suggest that the use of benthic
communities to assess the impact of low pH values was limited. Macro -invertebrate
communities are extremely difficult to assess in the deeper portions of reservoirs and are
probably non-existent in the dry spill channel. Cedar Cliff hydro discharge into the
riverine habitat is very different than the Lake Habitat downstream of Bear Creek Hydro.
For these reasons, macro -invertebrate assessments are not recommended to monitor
potential impacts from potential pyrite oxidation at Cedar Cliff.
Unlike biological assessments, water quality measurements specifically designed to
detect any chemical alterations have the advantage of:
• Direct correlation to pyrite oxidation
• Relatively rapid analysis of data
• Trends are readily assessed
• Various oxidation and acidification pathways are directly elucidated
• Treatment options (if necessary) may be evaluated and tested during the
excavation process rather than relying on long-term mitigation
Each water sample would measure the reactants and products of the pyrite oxidation
reactions. These analyses will be used to document the pH and pyrite oxidation
products in the lake, area leachates, and de -nitrification prior to and during the
construction project.
In addition to periodic water sampling, continual recording of conductivity would provide
a record of overall ionic change in the water. If oxidation products (ions) increase, the
very low conductivity of the Cedar Cliff water should reflect an increase in the ionic
strength and provide a record of the degree of change (if any).
Page 5 of 8
B-15

Proposed Duke Energy Monitoring Plan
Chemical Basis for Water Quality Monitoring
Major pH Buffering in Surface Water (Alkalinity): (Stumm and Morgan, 1981)
H20<=> H+ + OH -
0O2+ H20<=> H2CO3 <=> H+ + HCO3'- <=> H+ +CO3 2
Chemistry of Pyrite Oxidation (Stumm and Morgan, 1981)
Pyrrhotite reacts with oxygen and water to produce reduced iron and sulfuric acid
Fe(1-x)S + (2-0.5x)02+ xH20=> (1-x)Fe2+ +SO4 2- + 2xH+
Pyrite reacts with oxygen and water to produce reduced iron and sulfuric acid
2FeS2 (s) + 702 + 2H2O => 2Fe2+ + 4SO42- + 4H+ [2FeSO4 + 2H2SO4]
Reduced ferrous iron reacts with oxygen and acid to produce Ferric iron
(rate limiting except if biologically catalyzed)
Fee+ + 1/402 + H+ => Fe 3+ + 1/2H20
Ferric Iron reacts with water to form iron hydroxide (yellow -red precipitate) and acid
Fe3+ + 3H2O => Fe(OH)3 (s) + 3H+
Excess ferric iron reacts with pyrite and water to form ferrous iron and sulfuric acid
FeS2 (s) +14Fe3+ + 8H2O => 15Fe2+ + 2SO42- + 16H+
Table 2. Proposed Chemical Analysis of Water Samples Pending Detailed Review of
Procedures to Achieve Low Limits of Detection
Parameter
Chemical
Tentative Analytical Method
Field Analysis Lab Analysis
Symbol
Whole Water Sample
Alkalinity
HCO3'- C032-
n/a-
Titration (0.025N HCI),
Inflection end-point
Total Iron
Fe
n/a--
Digestion, ICP
Raw Water, ICP
Aluminum
Al
n/a-
Raw Water, ICP
Manganese
Mn
n/a-
Raw Water, ICP
Calcium
Cat+
n/a-
Raw Water, ICP
pH
H+
Low conductivity
- n/a-
electrodes
Turbidity
n/a
Hach 2100Q Portable
n/a-
Turbidimeter
Ferrous Iron
Feel
1, 10 Phenanthroline
n/a-
colorimetric
Iron Hydroxide
Fe(OH)3
absorbance
n/a-
Field Filtered Water Sample
Nitrate -Nitrite
NO3'—NO21-
n/a-
Colorimetric
Sulfate
SO42-
n/a-
Low level
ion chromatography
Page 6 of 8
B-16

Proposed Duke Energy Monitoring Plan
Water Quality Monitoring Program
The water quality monitoring program is divided into two phases, namely the reservoir
sampling and the spill channel sampling. The reservoir sampling is designed to evaluate
the slower pyrite oxidation rates due to lower oxygen concentrations associated with the
large particle spoil on the bottom of the lake and the suspension of small particles
washed off the larger rocks as they are put in the lake. The spill channel sampling is
designed to evaluate the expected higher oxidation rates due to the high oxygen content
of the atmosphere and the higher surface to volume ratios of the fine particles in the
excavated area. These fine particles would be suspended and transported down the
auxiliary spill channel during rain events.
Cedar Cliff Reservoir Samolin
Monthly 1 -meter profiles of Temperature, Dissolved Oxygen, Conductivity, pH, and
turbidity will be collected with a Hydrolab sonde fitted with a low ionic strength pH
reference electrode. The 1 -meter profiles would be taken in the reservoir at the deepest
point in the vicinity of the Cedar Cliff hydro intake (see Figure 2) and at the deepest
point, approximately 2000 feet up -stream of the in -lake spoil footprints. Water samples
(Table 2) would be taken one meter above the lake bottom and one meter from the
surface. An additional water sample would be taken from a depth corresponding to
either abnormally high turbidity or abnormally low pH values in the water column.
Additional monthly water samples would be taken in the immediate tailrace of Cedar Cliff
Hydro and, as recommended by the USACE, just upstream of the East Fork/West Fork
confluence. A recording Hobo© fresh water conductivity data logger will be placed in the
Cedar Cliff Tailrace for the duration of the project.
Cedar Cliff Spill Channel Sampling
Since the spill channel is normally dry, but does serve as a conduit for water runoff
during rain events, the water sampling has to be conducted while the channel has runoff
water in it. Therefore, the water samples would be taken during runoff events of 1/2 inch
of rain or more per 24 -hours (Figure 1). A continuous recording water level sensor and
a recording conductivity sensor will be placed in the auxiliary spill channel upstream of
the sediment berm location prior to excavation'. The data from a recording rain gage
located on Cedar Cliff dam will be correlated with the continuous water level data from
the auxiliary spill channel. After the sediment berm is installed, a second set of water
level and conductivity sensors will be added downstream of the berm. The data will
document runoff events with the associated ionic strength throughout the project.
Data Review and Reporting Requirements
Reservoir, tailrace, and spill channel sampling activities began in July 2018 to establish
pre -construction conditions. Sampling will continue throughout the duration of the
project, which is anticipated to be completed by March 2021. Duke Energy will consult
with applicable state and federal regulatory agencies to determine if potential
remediation measures should be implemented based on water quality monitoring results
during construction.
' The sediment berm will be constructed immediately prior to excavation and will not be in-place during
the pre -construction phase.
Page 7 of 8
B-17

Proposed Duke Energy Monitoring Plan
References
Bosch, J. and R. U. Meckenstock. 2012. Rates and potential mechanism of anaerobic
nitrate -dependent microbial pyrite oxidation. Biochemical Society Transactions
Volume 40, part 6.
DeNicola, D.M. and M.G. Stapleton. 2016. Using Macroin vertebrates to assess
ecological integrity of streams remediated for acid mine drainage. Restoration
Ecology 24:5, 656-667.
Gray, N.F.and E.Delaney. 2008. Comparison of benthic macroin vertebrate indices for
the assessment of the impact of acid mine drainage on an Irish river below an
abandoned Cu -S mine. Environ Pollut. 155:1, 31-40.
He, F., W.Jiang, T.Tang and Q.Cai. 2015. Assessing impact of acid mine drainage on
benthic macroinvertebrates: can functional diversity metrics be used as
indicators?. Journal of Freshwater Ecology, 30:4, 513-524.
HDR. 2017. Geological and Geotechnical Subsurface Investigation, East Fork Hydroelectric
Project and Cedar Cliff Development (FERC No. 2698). Tuckasegee, North
Carolina, Report for Duke Energy of the Carolinas, LLC.
HDR. 2018a. Cedar Cliff Rock Spoil Evaluation. East Fork Hydroelectric Project
and Cedar Cliff Development (FERC No. 2698) Tuckasegee, North Carolina
HDR. 2018b. Cedar Cliff Hydroelectric Development Auxiliary Spillway Upgrade Project
Status Update and Permitting Process. Power Point Presentation for Agency
Briefing January 18, 2018
Nantahala Power and Light. 2000. FERC Relicensing First Stage Consultation Package.
East Fork Hydroelectric Project, FERC Project No. 2608 -NC
North Carolina Division of Water Quality. 2011. Basin -wide Assessment Report Little
Tennessee River Basin. Water Quality Section, Division of Water Quality, North
Carolina Department of Environment and Natural Resources. Raleigh, NC.
Pugh, C.E., L.R. Hossner, and J.B. Dixon. 1984. Oxidation rate of iron sulfides as affected by
surface area, morphology, oxygen concentration, and autotrophic bacteria. Soil
Science. 137:5, pp. 309-314.
Stumm, W. and J.J. Morgan. 1981. Aquatic Chemistry. John Wiley & Sons, Inc.,New York,
NY, 780p.
Svitok, M., M. Novikmec, P. Bitusik, B.Masa, J. Obona, M.Ocadlik 5 and E.Michalkova.
2014. Benthic Communities of Low -Order Streams Affected by Acid Mine
Drainages: A Case Study from Central Europe. Water 6,1312-1338.
Page 8 of 8
B-18

DEPARTMENT OF THE ARMY
WILMINGTON DISTRICT, CORPS OF ENGINEERS
151 PATTON AVENUE
ROOM 208
ASHEVILLE, NORTH CAROLINA 28801-5006
March 22, 2017
Regulatory Division
Action ID: SAW -2015-02543
Mr. Jonathan Wise
Duke Energy Incorporated
400 South Tryon Street
:Mail Code ST28U
Charlotte, North Carolina 28285-1900
Dear Mr. Wise:
In accordance with your written request of July 26, 2016 and the ensuing administrative
record, enclosed are two copies of a permit to place fill in 110 liner feet of stream channel and
61.13 acres of open waters, resulting in impacts to waters of the U.S., for the Cedar Cliff
Auxiliary Spillway Upgrades Project. The above noted impacts are 110 linear feet of temporary
stream impacts associated with temporary stream crossings; 0.5 acres of temporary open water
impacts associated with a barge loading/staging area; 9.6 acres of permanent open water impacts
associated with disposal of rock spoil; 50.8 acres of temporary open water impacts associated
with dewatering of the reservoir; 0.01 acres of permanent open water impacts associated with
construction of a submerged weir/rock vane; and 0.22 acres of permanent open water impacts
associated with construction of a haul/access road.
You should acknowledge that you accept the terms and conditions of the enclosed permit by
signing and dating each copy in the spaces provided ("Permittee" on page 3). Your signature, as
permittee, indicates that, as consideration for the issuance of this permit, you voluntarily accept
and agree to comply with all of the terms and conditions of this permit. All pages of both copies
of the signed permit with drawings should then be returned to this office for final authorization.
A self-addressed envelope is enclosed.for your convenience.
Title 33, Part 325.1(f), of the Code of Federal Regulations reads, in part, that, "A $10 fee will
be charged for permit applications when the work is noncommercial in nature and provides
personal benefits that have no connection with a commercial enterprise...", and "A fee of $100
will be charged for permit applications when the planned or ultimate purpose of the project is
commercial or industrial in nature and is in support of operations that charge for the production,
distribution, or sale of goods or services." As your application fits the latter category, you are
requested to remit your check for $100, made payable to the Finance and Accounting Officer,
USAED, Wilmington. The check should accompany the signed and dated copies of your permit.
B-19

2
This correspondence contains a proffered permit for the above described site. If you object to
this decision, you may request an administrative appeal under Corps regulations at 33 CFR part
331. Enclosed you will find a Notification of Appeal Process (NAP) fact sheet and request for
appeal (RFA) form. If you request to appeal this decision you must submit a completed RFA
form to the following address:
District Engineer, Wilmington Regulatory Division
Attn: Mr. David Brown
69 Darlington Avenue
Wilmington, North Carolina 28403
In order for an RFA to be accepted by the Corps, the Corps must determine that it is
complete, that it meets the criteria for appeal under 33 CFR part 331.5, and that it has been
received by the Division Office within 60 days of the date of the NAP. Should you decide to
submit an RFA form, it must be received at the above address by May 18, 2017.
It is not necessary to submit an RFA form to the Division Office if you do not object to the
decision in contained in this correspondence.
After the permit is authorized in this office, the original copy will be returned to you; the
duplicate copy will be permanently retained in this office. If you have questions, please contact
Mr. David Brown at the Asheville Regulatory Field Office, telephone [phone], extension
4232.
Thank you in advance for completing our Customer Survey Form. This can be accomplished
by visiting our website at http://coMsmqpu.usace.army.mil/em wexlf?p=l 36:4:0 and completing
the survey on-line. We value your comments and appreciate your taking the time to complete a
survey each time you interact with our office.
Sincerely,
&'Ot � I 4:01L�
Kevin P. Landers, Sr.
Colonel, U.S. Army
District Commander
Enclosures
B-20

cc (with enclosures):
Mr. Bryan Thompkins
U.S. Fish and Wildlife Services
160 Zillicoa Street
Asheville, North Carolina, 28801
Ms. Karen Higgins
NCDEQ-DWR
1617 Mail Service Center
Raleigh, North Carolina 27699-1671
Mr. Zan Price
NCDEQ-DWR
2090 U.S. Highway 70
Swannanoa, North Carolina 28778
Ms. Renee Gledhill -Early
NCDNCR-SHPO
4617 Mail Service Center
Raleigh, North Carolina 27699-4617
Ms. Andrea Leslie
N.C. Wildlife Resources Commission
20830 Great Smoky Mountain Expressway
Waynesville, North Carolina 28786
V6. Eric Mularski
HDR, Inc.
440 S. Church Street, Suite 900
Charlotte, North Carolina 28202
B-21

DEPARTMENT OF THE ARMY PERMIT
Permittee DUKE ENERGY INCORPORATED
Permit No. SAW -2015-02543
Issuing Office CESAW-RG-A
NOTE: The term "you" and its derivatives, as used in this permit, means the permittee or any future transferee. The term "this
office" refers to the appropriate district or division office of the Corps of Engineers having jurisdiction over the permitted
activity or the appropriate official of that office acting under the authority of the commanding officer.
You are authorized to perform work in accordance with the terms and conditions specified below
Project Description:
To place fill in 110 liner feet of stream channel and 61.13 acres of open waters, resulting in
impacts to waters of the U.S., for the Cedar Cliff Auxiliary Spillway Upgrades Project. The above
noted impacts are 110 linear feet of temporary stream impacts associated with temporary stream
crossings; 0.5 acres of temporary open water impacts associated with a barge loading/staging
area; 9.6 acres of permanent open water impacts associated with disposal of rock spoil; 50.8
acres of temporary open water impacts associated with dewatering of the reservoir; 0.01 acres of
permanent open water impacts associated with construction of a submerged weir/rock vane; and
0.22 acres of permanent open water impacts associated with construction of a haul/access road.
Project Location:
In Tuckasegee, Jackson County, North Carolina
Permit Conditions:
General Conditions:
1. The time limit for completing the work authorized ends on December 31, 2022 . If you find that you need more time to
complete the authorized activity, submit your request for a time extension to this office for consideration at least one month
before the above date is reached.
2. You must maintain the activity authorized by this permit in good condition and in conformance with the terms and
conditions of this permit. You are not relieved of this requirement if you abandon the permitted activity, although you may
make a good faith transfer to a third party in compliance with General Condition 4 below. Should you wish to cease to maintain
the authorized activity or should you desire to abandon it without a good faith transfer, you must obtain a modification of this
permit from this office, which may require restoration of the area.
3. If you discover any previously unknown historic or archeological remains while accomplishing the activity authorized by
this permit, you must immediately notify this office of what you have found. We will initiate the Federal and state coordination
required to determine if the remains warrant a recovery effort or if the site is eligible for listing in the National Register of
Historic Places.
ENG FORM 1721, Nov 86 EDITION OF SEP 82 IS OBSOLETE. (33 CFR 325 (Appendix A))
B-22

4. If you sell the property associated with this permit, you must obtain the signature of the new owner in the space provided
and forward a copy of the permit to this office to validate the transfer of this authorization.
5. If a conditioned water quality certification has been issued for your project, you must comply with the conditions specified
in the certification as special conditions to this permit. For your convenience, a copy of the certification is attached if it
contains such conditions.
6. You must allow representatives from this office to inspect the authorized activity at any time deemed necessary to ensure
that it is being or has been accomplished in accordance with the terms and conditions of your permit,
Special Conditions:
SEE ATTACHED SPECIAL CONDITIONS
Further Information:
1. Congressional Authorities: You have been authorized to undertake the activity described above pursuant to:
0 Section 10 of the Rivers and Harbors Act of 1899 (33 U.S.C. 403).
( ✓0 Section 404 of the Clean Water Act (33 U.S.C. 1344).
(D Section 103 of the Marine Protection, Research and Sanctuaries Act of 1972 (33 U.S.C. 1413).
2. Limits of this authorization.
a. This permit does not obviate the need to obtain other Federal, state, or local authorizations required by law.
b. This permit does not grant any property rights or exclusive privileges.
c. This permit does not authorize any injury to the property or rights of others.
d. This permit does not authorize interference with any existing or proposed Federal project.
3. Limits of Federal Liability. In issuing this permit, the Federal Government does not assume any liability for the following:
a. Damages to the permitted project or uses thereof as a result of other permitted or unpermitted activities or from natural
causes.
b. Damages to the permitted project or uses thereof as a result of current or future activities undertaken by or on behalf
of the United States in the public interest.
c. Damages to persons, property, or to other permitted or unpermitted activities or structures caused by the activity
authorized by this permit.
d. Design or construction deficiencies associated with the permitted work.
e. Damage claims associated with any future modification, suspension, or revocation of this permit.
B-23

4. Reliance on Applicant's Data: The determination of this office that issuance of this permit is not contrary to the public
interest was made in reliance on the information you provided.
5. Reevaluation of Permit Decision. This office may reevaluate its decision on this permit at any time the circumstances
warrant. Circumstances that could require a reevaluation include, but are not limited to, the following:
a. You fail to comply with the terms and conditions of this permit.
b. The information provided by you in support of your permit application proves to have been false, incomplete, or
inaccurate (See 4 above).
c. Significant new information surfaces which this office did not consider in reaching the original public interest decision.
Such a reevaluation may result in a determination that it is appropriate to use the suspension, modification, and revocation
procedures contained in 33 CFR 325.7 or enforcement procedures such as those contained in 33 CFR 326.4 and 326.5. The
referenced enforcement procedures provide for the issuance of an administrative order requiring you to comply with the terms
and conditions of your permit and for the initiation of legal action where appropriate. You will be required to pay for any
corrective measures ordered by this office, and if .you fail to comply with such directive, this office may in certain situations
(such as those specified in 33 CFR 209.170) accomplish the corrective measures by contract or otherwise and bill you for the
cost.
6. Extensions. General condition 1 establishes a time limit for the completion of the activity authorized by this permit. Unless
there are circumstances requiring either a prompt completion of the authorized activity or a reevaluation of the public interest
decision, the Corps will normally give favorable consideration to a request for an extension of this time limit.
Your signature below, as permittee, indicates that you accept and agree to comply with the terms and conditions of this permit.
(PERMITTEE) DUKE ENERGY INCORPORATED
(DATE)
This permit becomes effective when the Federal official, designated to act for the Secretary of the Army, has signed below.
(DISTRICT COMMANDER) KEVIN P. LANDERS, SR. (DATE)
COLONEL, U.S. ARMY
DISTRICT COMMANDER
When the structures or work authorized by this permit are still in existence at the time the property is transferred, the terms and
conditions of this permit will continue to be binding on the new owner(s) of the property. To validate the transfer of this permit
and the associated liabilities associated with compliance with its terms and conditions, have the transferee sign and date below.
(TRANSFEREE)
(DATE)
*U.S. GOVERNMENT PRINTING OFFICE: 1986 - 717-425
B-24

NOTIFICATION OF ADMINISTRATIVE APPEAL OPTIONS AN1) PROCESS AND
REQUEST FOR APPEAL
Applicant: Duke Energy Incorporated File Number: Date:
Attn: Jonathan Wise SAW -2015-02543 March 22 2017
Attached is:
See Section below
INITIAL PROFFERED PERMIT (Standard Permit or Letter ofpermission)
A
❑ PROFFERED PERMIT (Standard Permit or Letter ofpermission)
B
❑ PERMIT DENIAL
C
❑ APPROVED JURISDICTIONAL DETERMINATION
D
PRELIMINARY JURISDICTIONAL DETERMINATION
E
SECTION I - The following identifies your rights and oplions regarding. an administrative appeal of the above decision.
Additional information may he found at http-//www.usace.army.mil/inet/functioiis/ctiv/ccewo/re-g or
Carps regulations at 33 GFR Part .331..-
A: INITIAL PROFFERED PERMIT: You may accept or object to the permit.
■ ACCEPT: If you received a Standard Permit, you may sign the permit document and return it to the district engineer for final
authorization. If you received a Letter of Permission (LOP), you may accept the LOP and your work is authorized. Your
signature on the Standard Permit or acceptance of the LOP means that you accept the permit in its entirety, and waive all
rights to appeal the permit, including its terms and conditions, and approved jurisdictional determinations associated with the
permit.
• OBJECT: If you object to the permit (Standard or LOP) because of certain terms and conditions therein, you may request
that the permit be modified accordingly. You must complete Section II of this form and return the form to the district
engineer. Your objections must be received by the district engineer within 60 days of the date of this notice, or you will
forfeit your right to appeal the permit in the future. Upon receipt of your letter, the district engineer will evaluate your
objections and may: (a) modify the permit to address all of your concerns, (b) modify the permit to address some of your
objections, or (c) not modify the permit having determined that the permit should be issued as previously written. After
evaluating your objections, the district engineer will send you a proffered permit for your reconsideration, as indicated in
Section B below.
B: PROFFERED PERMIT: You may accept or appeal the permit
• ACCEPT: If you received a Standard Permit, you may sign the permit document and return it to the district engineer for final
authorization. If you received a Letter of Permission (LOP), you may accept the LOP and your work is authorized. Your
signature on the Standard Permit or acceptance of the LOP means that you accept the permit in its entirety, and waive all
rights to appeal the permit, including its terms and conditions, and approved jurisdictional determinations associated with the
permit.
■ APPEAL: If you choose to decline the proffered permit (Standard or LOP) because of certain terms and conditions therein,
you may appeal the declined permit under the Corps of Engineers Administrative Appeal Process by completing Section II of
this form and sending the form to the division engineer. This form must be received by the division engineer within 60 days
of the date of this notice.
C: PERMIT DENIAL: You may appeal the denial of a permit under the Corps of Engineers Administrative Appeal Process by
completing Section II of this form and sending the form to the division engineer. This form must be received by the division
engineer within 60 days of the date of this notice.
D: APPROVED JURISDICTIONAL DETERMINATION: You may accept or appeal the approved JD or provide new
information.
• ACCEPT: You do not need to notify the Corps to accept an approved JD. Failure to notify the Corps within 60 days of the
date of this notice, means that you accept the approved JD in its entirety, and waive all rights to appeal the approved JD.
• APPEAL: If you disagree with the approved JD, you may appeal the approved JD under the Corps of Engineers
Administrative Appeal Process by completing Section II of this form and sending the form to the district engineer. This form
must be received by the division engineer within 60 days of the date of this notice.
B-25

E: PRELIMINARY JURISDICTIONAL DETERMINATION: You do not need to respond to the Corps regarding the
preliminary JD. The Preliminary JD is not appealable. If you wish, you may request an approved JD (which may be appealed),
by contacting the Corps district for further instruction. Also you may provide new information for further consideration by the
Corps to reevaluate the JD.
SECTION II - REQUEST FOR APPEAL or OBJECTIONS TO AN INITIAL PROFFERED PERMIT
REASONS FOR APPEAL OR OBJECTIONS: (Describe your reasons for appealing the decision or your objections to an initial
proffered permit in clear concise statements. You may attach additional information to this form to clarify where your reasons or
objections are addressed in the administrative record.)
ADDITIONAL INFORMATION: The appeal is limited to a review of the administrative record, the Corps memorandum for the
record of the appeal conference or meeting, and any supplemental information that the review officer has determined is needed to
clarify the administrative record. Neither the appellant nor the Corps may add new information or analyses to the record.
However, you may provide additional information to clarify the location of information that is already in the administrative
record.
POINT OF CONTACT FOR QUESTIONS OR INFORMATION:_ _
If you have questions regarding this decision and/or the If you only have questions regarding the appeal process you may
appeal process you may contact: also contact:
Mr. Jason Steele, Administrative Appeal Review Officer
District Engineer, Wilmington Regulatory Division, CESAD-PDO
Attn: Mr. David Brown U.S. Army Corps of Engineers, South Atlantic Division
USACE 60 Forsyth Street, Room 10M15
151 Patton Avenue, Room 208 Atlanta, Georgia 30303-8801
Asheville, NC 28801 Phone: [phone]I37
RIGHT OF ENTRY: Your signature below grants the right of entry to Corps of Engineers personnel, and any government
consultants, to conduct investigations of the project site during the course of the appeal process. You will be provided a I5 day
notice of any site investigation, and will have the opportunity to participate in all site investigations.
Date:
Telephone number:
Signature of appellant oragent.
For appeals on Initial Proffered Permits send this form to:
District Engineer, Wilmington Regulatory Division, Attn: Mr. David Brown, 69 Darlington Avenue,
Wilmington, North Carolina 28403
For Permit denials, Proffered Permits and approved Jurisdictional Determinations send this form to:
Division Engineer, Commander, U.S. Army Engineer Division, South Atlantic, Attn: Mr. Jason Steele,
Administrative Appeal Officer, CESAD-PDO, 60 Forsyth Street, Room 10M15, Atlanta, Georgia
30303-8801
Phone: [phone]
B-26

SPECIAL CONDITIONS
SAW -2015-02543
WORK LIMITS
1.0 CONSTRUCTION PLANS: All work authorized by this permit must be performed in
strict compliance with the attached plans, which are a part of this permit. Any
modification to these plans which alters the authorized impacts to waters of the U.S.
must be approved by the US Army Corps of Engineers (USACE) prior to
implementation.
2.0 UNAUTHORIZED DREDGE OR FILL: Except as authorized by this permit or any
USACE approved modification to this permit, no excavation, fill or mechanized land -
clearing activities shall take place at any time in the construction or maintenance of this
project, within waters or wetlands. This permit does not authorize temporary placement
or double handling of excavated or fill material within waters or wetlands outside the
permitted area. This prohibition applies to all borrow and fill activities connected with
this project.
3.0 MAINTAIN CIRCULATION AND FLOW OF WATERS: Except as specified in the
plans attached to this permit, no excavation, fill or mechanized land -clearing activities
shall take place at any time in the construction or maintenance of this project, in such a
manner as to impair normal flows and circulation patterns within waters or wetlands or
to reduce the reach of waters or wetlands.
4.0 DEVIATION FROM PERMITTED PLANS: The permittee shall ensure that the
construction design plans for this project do not deviate from the permit plans attached
to this authorization. Written verification shall be provided that the final construction
drawings comply with the attached permit drawings prior to any active construction in
waters of the U.S., including wetlands. Any deviation in the construction design plans
will be brought to the attention of the Corps of Engineers, Mr. David Brown, Asheville
Regulatory Field Office prior to any active construction in waters or wetlands.
5.0 PRECONSTRUCTION MEETING: The Permittee shall schedule an onsite
preconstruction meeting between its representatives, the contractor's representatives
and the appropriate Corps of Engineers Project Manager prior to undertaking any work
within jurisdictional waters and wetlands to ensure that there is a mutual understanding
of all terms and conditions contained within the Department of the Army permit. The
Permittee shall notify the Corps of Engineers Project Manager a minimum of thirty (30)
days in advance of the scheduled meeting in order to provide that individual with ample
opportunity to schedule and participate in the required meeting.
B-27

RELATED LAWS
6.0 WATER CONTAMINATION: All mechanized equipment will be regularly inspected
and maintained to prevent contamination of waters and wetlands from fuels, lubricants,
hydraulic fluids, or other toxic materials. In the event of a spill of petroleum products or
any other hazardous waste, the permittee shall immediately report it to the N.C. Division
of Water Resources at [phone] or [phone] and provisions of the North
Carolina Oil Pollution and Hazardous Substances Control Act will be followed.
CULTURAL RESOURCES
7.0 Per comments (see attached letter) from N.C. Department of Natural and Cultural
Resources, State Historic Preservation Office (NCDNR-SHPO), the Permittee shall
thoroughly photo -document the current condition of the Cedar Cliff dam and its
surroundings before improvements to the dam are initiated. This documentation shall
follow the agency's guidelines and be submitted to NCDNR-SHPO within 90 -days after
start of on-site activities.
PROJECT MAINTENANCE
8.0 NOTIFICATION OF CONSTRUCTION COMMENCEMENT AND COMPLETION:
The permittee shall advise the Corps in writing prior to beginning the work authorized by
this permit and again upon completion of the work authorized by this permit.
9.0 CLEAN FILL: Unless otherwise authorized by this permit, all fill material placed in
waters or wetlands shall be generated from an upland source and will be clean and free
of any pollutants except in trace quantities. Metal products, organic materials (including
debris from land clearing activities), or unsightly debris will not be used. Soils used for
fill shall not be contaminated with any toxic substance in concentrations governed by
Section 307 of the Clean Water Act.
10.0 PERMIT DISTRIBUTION: The permittee shall require its contractors and/or agents
to comply with the terms and conditions of this permit in the construction and
maintenance of this project, and shall provide each of its contractors and/or agents
associated with the construction or maintenance of this project with a copy of this
permit. A copy of this permit, including all conditions, shall be available at the project
site during construction and maintenance of this project.
11.0 SILT -FENCING: The permittee shall employ all sedimentation and erosion control
measures necessary to prevent an increase in sedimentation or turbidity within waters
and wetlands outside the permit area. This shall include, but is not limited to, the
immediate installation of silt fencing or similar appropriate devices around all areas
subject to soil disturbance or the movement of earthen fill, and the immediate
stabilization of all disturbed areas. Additionally, the project must remain in full
compliance with all aspects of the Sedimentation Pollution Control Act of 1973 (North
Carolina General Statutes Chapter 113A Article 4).
2
B-28

12.0 PERMIT REVOCATION: The permittee, upon receipt of a notice of revocation of
this permit or upon its expiration before completion of the work will, without expense to
the United States and in such time and manner as the Secretary of the Army or his
authorized representative may direct, restore the water or wetland to its pre -project
condition.
13.0 EROSION CONTROL MEASURES IN WETLANDS: The permittee shall remove all
sediment and erosion control measures placed in wetlands or waters, and shall restore
natural grades in those areas, prior to project completion.
ENFORCEMENT
14.0 REPORTING ADDRESS: All reports, documentation and correspondence required
by the conditions of this permit shall be submitted to the following address: U.S. Army
Corps of Engineers, Regulatory Division, Asheville Regulatory Field Office, c/o
Mr. David Brown, 151 Patton Avenue, Room 208, Asheville, NC 28801-5006 and by
telephone at: 828-271-7980. The Permittee shall reference the following permit number,
SAW -2013-01159, on all submittals.
15.0 REPORTING VIOLATIONS OF THE CLEAN WATER ACT AND RIVERS AND
HARBORS ACT: Violation of these conditions or violation of Section 404 of the Clean
Water Act of Section 10 of the Rivers and Harbors Act must be reported in writing to
U.S. Army Corps of Engineers, Regulatory Division, Asheville Regulatory Field Office,
c/o Mr. David Brown, 151 Patton Avenue, Room 208, Asheville, NC 28801-5006 and by
telephone at: 828-271-7980, within 24 hours of the permittee's discovery of the
violation.
16.0 COMPLIANCE INSPECTION: A representative of the Corps of Engineers will
periodically and randomly inspect the work for compliance with these conditions.
Deviations from these procedures may result in an administrative financial penalty
and/or directive to cease work until the problem is resolved to the satisfaction of the
Corps.
CONCRETE CONDITION
17.0 PROHIBITIONS ON CONCRETE: The permittee shall take measures to prevent
live or fresh concrete, including bags of uncured concrete, from coming into contact with
any water in or entering into waters of the United States. Water inside coffer dams or
casings that has been in contact with concrete shall only be returned to waters of the
United States when it no longer poses a threat to aquatic organisms (concrete is set
and cured).
3
B-29

CULVERTS
18.0 INSTALLATION OF CULVERTS: For construction of culverts, measures will be
included in the construction that will promote the safe passage of fish and other aquatic
organisms. For all culvert construction activities, the dimension, pattern, and profile of
the stream, (above and below a pipe or culvert), should not be modified by widening the
stream channel or by reducing the depth of the stream. Culvert inverts will be buried at
least one foot below the bed of the stream for culverts greater than 48 inches in
diameter. For culverts 48 inches in diameter or smaller, culverts must be buried below
the bed of the stream to a depth equal to or greater than 20 percent of the diameter of
the culvert.
ESA
19.0 THREATENED AND ENDANGERED SPECIES: All necessary precautions and
measures will be implemented so that any activity will not kill, injure, capture, harass, or
otherwise harm any protected federally listed species. While accomplishing the
authorized work, if the permittee discovers or observes a damaged or hurt listed
endangered or threatened species, the District Engineer will be immediately notified to
initiate the required Federal coordination.
Per comments (see attached letter) from U.S. Fish and Wildlife Service (USFWS), the
permittee shall implement the following measures to avoid impacts to Indiana Bat
(Myotis sodalis) and Northern Long-eared Bat (Myotis septentrionalis):
1. Trees within the 3 -acre blasting and clearing area will be cut during the winter
(October 15 -April 15) to avoid impacts to avoid the maternity roost period for
Indiana Bat and Northern Long -Eared Bat.
2. If any random trees must be cut during the summer roost period, USFWS will be
notified (Mr. Bryan Thompkins, 828-258-3939, ext. 240) and an experienced
biologist will conduct an on-site habitat assessment to determine if trees are
suitable maternity roost trees. If the tree(s) to be cut are suitable roost trees, an
emergence survey will be conducted before tree removal.
3. All potential suitable roost trees identified adjacent to the project area will be
marked and protected during clearing activities.
4. If emergence surveys are conducted before the removal of random tree(s) during
the summer maternity roost period and the emergence surveys indicate bats are
observed using the tree(s) to be removed, the permittee shall contact USFWS
(Mr. Bryan Thompkins, 828-258-3939,etx. 240) to establish a plan for proceeding
before the tree(s) is removed.
4
B-30

OTHER
20.0 TURBIDITY BARRIERS: Prior to the initiation of any of the work authorized by this
permit the Permittee shall install floating turbidity barriers with weighted skirts that
extend to within 1 foot of the bottom around all work areas that are in, or adjacent to,
surface waters. The turbidity barriers shall remain in place and be maintained until the
authorized work has been completed and all erodible materials have been stabilized.
21.0 AS -BUILT CONSTRUCTION PLANS: Upon completion of each construction
phase, the permittee shall submit to the Corps as -built plans for those portions that
affect waters of the U.S., within 4 months following the completion of construction. The
as -built plans shall include, but not necessarily be limited to, grading, structures and
activities in or affecting wetlands and waters of the U.S.
UTILITY LINES
22.0 Prior to construction within any jurisdictional areas, the permittee must correctly
install silt fencing (with or without safety fencing) parallel with the utility line corridor, on
both sides of the jurisdictional crossing. This barrier is to serve both as an erosion
control measure and a visual identifier of the limits of construction within any
jurisdictional area. The permittee must maintain the fencing, at minimum, until the
wetlands have re -vegetated and stabilized.
B-31

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B-44

Water Resources
ENVIRONMENTAL QUALITY
December 9, 2016
Duke Energy Carolinas, LLC
Attn: Mr. Jonathan Wise
400 S. Church St
Charlotte NC 28202
PAT MCCRORY
Governor
DONALD R. VAN DER VAART
Secretary
S. JAY ZIMMERMAN
Director
DWR # 2016-0742 reissuance
Jackson County
Subject: Approval of Individual 401 Water Quality Certification with Additional Conditions
Cedar Cliff Development Auxiliary Spillway Upgrade Project
USACE Action ID. No. SAW -2015-02543
Dear Mr. Wise:
Attached hereto is a copy of Certification No. WQC004077 issued to Mr. Jonathan Wise and
Duke Energy Carolinas, LLC, dated December 6, 2016. This Certification replaces the
Certification issued on November 10, 2016 to account for additional open water impacts
from the 1951 Access Road Connection. Please note that you should get any other federal,
state or local permits before proceeding with the subject project, including those required
by (but not limited to) Sediment and Erosion Control, Non -Discharge, and Water Supply
Watershed regulations.
This approval and its conditions are final and binding unless contested. This Certification
can be contested as provided in General Statute 150B by filing a written petition for an
administrative hearing to the Office of Administrative Hearings (hereby known as OAH)
within sixty (60) calendar days.
A petition form maybe obtained from the OAH at http:j/www.ncoah.coni or by calling the
OAH Clerk's Office at [phone] for information. A petition is considered filed when
the original and one (1) copy along with any applicable OAH filing fee is received in the OAH
during normal office hours (Monday through Friday between 8:00am and 5:00pm, excluding
official state holidays).
The petition may be faxed to the OAH at [phone], provided the original and one copy of
the petition along with any applicable OAH filing fee is received by the OAH within five (5)
business days following the faxed transmission.
State of North Caralina I Environmental Quality j Water Resources
1617 Mail service Center I Raleigh, North Carolina 27699-1617
919 807 6300
B-45

Mailing address for the OAH:
If sending via US Postal Service;
Office of Administrative Hearings
6714 Mail Service Center
Raleigh, NC 27699-6714
Cedar Cliff Development Auxiliary Spillway Upgrade Project
DWR # 16-0742 reissuance
Individual Certification #4077
Page 2 of 7
!f sending via delivery service (UPS,
FedEx, etc):
Office of Administrative Hearings
1711 New Hope Church Road
Raleigh, NC 27609-6285
One (1) copy of the petition must also be served to DEQ:
Sam Hayes, General Counsel
Department of Environmental Quality
1601 Mail Service Center
Raleigh, NC 27699-1601
Unless such a petition is filed, this Certification shall be final and binding.
This certification completes the review of the Division under section 401 of the Clean Water Act
and 15A NCAC 02H.0500. Contact Sue Homewood at 336-776-9693 or
[e-mail] if you have any questions or concerns.
Sincerely,
41mc 1%
Karen Higgins, Supervisor
401 & Buffer Permitting Branch
cc: Mr. Eric Mularski, HDR Engineering Inc. (via email)
David Brown, USACE Asheville Regulatory Field Office
Todd Bowers, EPA, Sam Nunn Federal Center, 61 Forsyth Street SW, Atlanta, GA 30303
DWR WSRO 401 file
File Copy (Laserfiche)
filename: 160742CedarCliffSpillway(Jackson)_401_I C_reissue
B-46

Cedar Cliff Development Auxiliary Spillway Upgrade Project
DWR # 16-0742 reissuance
Individual Certification #4077
Page 3 of 7
NORTH CAROLINA 401 WATER QUALITY CERTIFICATION
CERTIFICATION #WQC004077 is issued in conformity with the requirements of Section 401,
Public Laws 92-500 and 95-217 of the United States and subject to North Carolina's Regulations in
15A NCAC 02H .0500, to Mr. Jonathan Wise and Duke Energy Carolinas, LLC, who have
authorization for the impacts listed below, as described within your application received by the
N.C. Division of Water Resources (Division) on July 29, 2016 with additional information received
October 20, 2016, and November 15, 2016, and by Public Notice issued by the U. S. Army Corps of
Engineers and received by the Division on August 12, 2016.
The State of North Carolina certifies that this activity will not violate the applicable portions of
Sections 301, 302, 303, 306, 307 of the Public Laws 92-500 and PL 95-217 if conducted in
accordance with the application, the supporting documentation, and conditions hereinafter set
forth.
This approval requires you to follow the conditions listed in the certification below.
Conditions of Certification:
1. The following impacts are hereby approved provided that all of the other specific and
general conditions of the Certification are met. No other impacts are approved, including
incidental impacts. [15A NCAC 02H .0506(b) and/or (c)]
Type of Impact
Amount Approved
(units)
Permanent
Amount Approved
(units)
Temporary
Stream
Site 1
0 (linear feet)
110 (linear feet)
Open Waters
Site OW1
0 (acres)
0.5 (acres)
Site OW2
9.6 (acres)
0 (acres)
Site OW3
0 (acres)
50.8 (acres)
Site OW4
_
0.01 (acres)
0 (acres)
Site OW5 —1951
access connector rd
0.22 (acres)
0 (acres)
2. The NC Wildlife Resource Commission (NCWRC) shall be consulted to determine the
preferred rock spoil locations within the lake.
3. A reservoir drawdown plan shall be provided to the Division for approval 30 calendar days
prior to submittal to FERC.
B-47

Cedar Cliff Development Auxiliary Spillway Upgrade Project
DWR # 16-0742 reissuance
Individual Certification #4077
Page 4 of 7
4. The Permittee shall maintain compliance with all conditions of DWR Certification No. 3831
(DWR Project #2003-1112).
5. No waste, spoil, solids, or fill of any kind shall occur in wetlands, waters, or riparian areas
beyond the footprint of the impacts depicted in the Pre -Construction Notification for this
project. All construction activities, including the design, installation, operation, and
maintenance of sediment and erosion control Best Management Practices shall be
performed so that no violations of state water quality standards, statutes, or rules occur.
Approved plans and specifications for this project are incorporated by reference and are
enforceable parts of this permit. [15A NCAC 02H .0501 and .0502]
6. The Permittee shall secure approval of an Erosion and Sediment Control Plan prior to
commencing drawdown of the water level in the reservoir. Sediment and erosion control
measures shall not be installed in wetlands or waters with the exception of turbidity
curtains. All sediment and erosion control devices shall be removed and the natural grade
restored within two (2) months of the date that the Division of Energy, Mineral and Land
Resources (DEMLR) has released the specific area within the project. [15A NCAC 02H .0501
and .0502]
7. Erosion and sediment control practices must be in full compliance with all specifications
governing the proper design, installation and operation and maintenance of such Best
Management Practices. If applicable, the project must comply with the specific conditions
and requirements of the NPDES Construction Stormwater Permit issued to the site and the
following requirements [15A NCAC 02H .0506(b)(3) and (c)(3)1:
a. Design, installation, operation, and maintenance of the sediment and erosion
control measures must be such that they equal or exceed the requirements specified
in the most recent version of the North Carolina Sediment and Erosion Control
Manual. The devices shall be maintained on all construction sites, borrow sites, and
waste pile (spoil) projects, including contractor -owned or leased borrow pits
associated with the project.
b. For borrow pit sites, the erosion and sediment control measures must be designed,
installed, operated, and maintained in accordance with the most recent version of
the North Carolina Surface Mining Manual.
c. Reclamation measures and implementation must comply with the reclamation in
accordance with the requirements of the Sedimentation Pollution Control Act and
the Mining Act of 1971.
d. Sufficient materials required for stabilization and/or repair of erosion control
measures and Stormwater routing and treatment shall be on site at all times.
B-48

Cedar Cliff Development Auxiliary Spillway Upgrade Project
DWR # 16-0742 reissuance
Individual Certification #4077
Page 5 of 7
6. An NPDES Construction Stormwater Permit is required for construction projects that disturb
one (1) or more acres of land. This Permit allows stormwater to be discharged during land
disturbing construction activities as stipulated in the conditions of the permit. If your
project is covered by this permit, full compliance with permit conditions including the
erosion & sedimentation control plan, inspections and maintenance, self-monitoring, record
keeping and reporting requirements is required. A copy of the general permit
(NCGO10000), inspection log sheets, and other information may be found at:
li_ ttp://deg.nc.ixoylabout/divisioiis/erre[gy-mineral-lane-resources/energy-mineral-land-
peerr7lits storr7iwater-permit51construction-sw. 15A NCAC 02H .0506(b)(5) and (c)(5)]
7. All work in or adjacent to stream waters shall be conducted so that the flowing stream does
not come in contact with the disturbed area. Approved best management practices from the
most current version of the NC Sediment and Erosion Control Manual, or the NC DOT
Construction and Maintenance Activities Manual, such as sandbags, rock berms, cofferdams,
and other diversion structures shall be used to minimize excavation in flowing water. [15A
NCAC 02H .0506(b)(3) and (c)(3)]
8. If concrete is used during the construction, then all necessary measures shall be taken to
prevent direct contact between uncured or curing concrete and waters of the state. Water
that inadvertently contacts uncured concrete shall not be discharged to waters of the state
due to the potential for elevated pH and possible aquatic life/fish kills. [15A NCAC 02B .0200]
9. Temporary culverts required for this project shall be installed in such a manner that the
original stream profiles are not altered and to allow for aquatic life movement during low
flows. Existing stream dimensions (including the cross section dimensions, pattern and
longitudinal profile) must be maintained above and below locations of each culvert.
10. All temporary fill and culverts shall be removed and the impacted area returned to natural
conditions, within 60 days of the determination that the temporary impact is no longer
necessary. The impacted areas shall be restored to original grade, including the stream's
original cross sectional dimensions, plan form pattern, and longitudinal bed and bed profile,
and the site shall be stabilized with natural woody vegetation (except approved maintenance
areas) and restored to prevent erosion. [15A NCAC 02H .0506(b)(2) and (c)(2)]
11. All temporary pipes/culverts/riprap pads etc, shall be installed in all streams as outlined in the
most recent edition of the North Carolina Sediment and Erosion Control Planning and Design
Manual so as not to restrict stream flow or cause dis-equilibrium. [15A NCAC 02H .0506(b)(2)
and (c)(2)]
B-49

Cedar Cliff Development Auxiliary Spillway Upgrade Project
DWR # 16-0742 reissuance
Individual Certification #4077
Page 6 of 7
12. Any riprap required for proper culvert placement, stream stabilization, or restoration of
temporarily disturbed areas shall be restricted to the area directly impacted by the approved
construction activity. All riprap shall be buried and/or "keyed in" such that the original
stream elevation and streambank contours are restored and maintained. Placement of riprap
or other approved materials shall not result in de -stabilization of the stream bed or banks
upstream or downstream of the area. [15A NCAC 02H .0506(b)(2)]
13. Any riprap used for stream stabilization shall be of a size and density to prevent movement by
wave action, current action, or stream flows and consist of clean rock or masonry material
free of debris or toxic pollutants. Riprap shall not be installed in the streambed except in
specific areas required for velocity control and to ensure integrity of bank stabilization
measures. [15A NCAC 02H .0506(b)(2)]
14. This Certification does not relieve the applicant of the responsibility to obtain all other
required Federal, State, or Local approvals.
15. Mr. Jonathan Wise and Duke Energy Carolinas, LLC shall conduct construction activities in a
manner consistent with State water quality standards (including any requirements resulting
from compliance with section 303(d) of the Clean Water Act) and any other appropriate
requirements of State and Federal law. [15A NCAC 02B .0200] If the Division determines that
such standards or laws are not being met (including the failure to sustain a designated or
achieved use) or that State or federal law is being violated, or that further conditions are
necessary to assure compliance, the Division may reevaluate and modify this Certification.
Before modifying the Certification, the Division shall notify Mr. Jonathan Wise and Duke
Energy Carolinas, LLC and the U.S. Army Corps of Engineers, provide public notice in
accordance with 15A NCAC 02H .0503 and provide opportunity for public hearing in
accordance with 15A NCAC 02H .0504. Any new or revised conditions shall be provided to
Mr. Jonathan Wise and Duke Energy Carolinas, LLC in writing, shall be provided to the U.S.
Army Corps of Engineers for reference in any Permit issued pursuant to Section 404 of the
Clean Water Act, and shall also become conditions of the 404 Permit for the project.
16. This approval is for the purpose and design described in your application and as described in
the Public Notice. The plans and specifications for this project are incorporated by reference
and are an enforceable part of the Certification. If you change your project, you must notify
the Division and you may be required to submit a new application package with the
appropriate fee. If the property is sold or transferred, the new owner must be given a copy of
this Certification and is responsible for complying with all conditions. Any new owner must
notify the Division and request the Certification be issued in their name. [15A NCAC 02H
.0501 and .05021
B-50

Cedar Cliff Development Auxiliary Spillway Upgrade Project
DWR # 16-0742 reissuance
Individual Certification #4077
Page 7 of 7
17. The applicant and/or authorized agent shall provide a completed Certificate of Completion
Form to the DWR 401 & Buffer Permitting Unit within ten days of project completion
(available at: httncdenr.s3.amazonaws.com s3fs-
Public/Water%20Qualit Surface%20Water%20Protection/401/Certs%20and/%20Permits/Cer
tificateofCom letion Feb2015.doc). [15A NCAC 02H .0502(f)]
18. This certification grants permission to the Director or an authorized representative of the
Director, upon the presentation of proper credentials, to enter the property during normal
business hours. [15A NCAC 02H .0502(e)]
This approval to proceed with your proposed impacts or to conduct impacts to waters as
depicted in your application shall expire upon expiration of the 404 Permit. The conditions in
effect on the date of issuance shall remain in effect for the life of the project, regardless of the
expiration date of this Certification. [15A NCAC 02H .0507(d)(2) and 15A NCAC 02H .0506]
Non-compliance with or violation of the conditions herein set forth may result in revocation of
this Certification and may also result in criminal and/or civil penalties.
This the 9th day of December, 2016
ck w v 1
Karen Higgins, Supervise
401 & Buffer Permitting Branch
KAH/sh
WQC004077
B-51

United States Department of the Interior
FISH AND WILDLIFE SERVICE
Asheville Field Office
160 Zillicoa Street
Asheville, North Carolina 28801
August 19, 2016
Mr. David Brown
Asheville Regulatory Field Office
U.S. Army Corps of Engineers
151 Patton Avenue, Room 208
Asheville, North Carolina 28801-5006
Dear Mr. Brown:
This is the report of the U.S. Fish and Wildlife Service and the Department of the Interior on the
U.S. Army Corps of Engineers' (Corps) Public Notice (PN) of an Individual Permit Application
(IPA) submitted by Mr. Jonathan Ray of Duke Energy Carolinas, LLC (Duke Energy), represented
by Mr. Eric Mularski of HDR Engineering, Inc., to impact about 110 linear feet of stream impacts,
51.3 -acres of temporary open water impacts, and 9.61 -acres of permanent open water impacts within
the East Fork Hydroelectric Project Area, in Jackson County, North Carolina. Information for this
report is based on multiple site visits conducted by staff of this office with representatives from Duke
Energy and HDR, and a review of the PN issued by the Corps. The report is submitted in accordance
with the provisions of the National Environmental Policy Act; Fish and Wildlife Coordination Act, as
amended (16 U.S.C. 661-667e); and section 7 of the Endangered Species Act of 1973, as amended
(16 U.S.C. 1531-1543) (Act).
According to the information presented, the proposed project consists of modifying the existing
Cedar Cliff dam auxiliary spillway and main dam berm to safely pass the calculated Probable
Maximum Flood (PMF), which is defined as the Inflow Design Flood (IDF), without overtopping the
Cedar Cliff dam. The PMF peak inflow of the Cedar Cliff project is about 192,000 cfs, which was
approved by FERC on June 22, 1994. Based on this and engineering calculations, the auxiliary
spillway is incapable of passing the PMF and needs to be increased by about 112,000 cfs to prevent
overtopping the dam. The FERC identified the IDF as the PMF in correspondence to Duke Energy
dated April 24, 2014, and requested that the project be modified to safely pass all flows up to and
including the IDF. To meet this objective, Duke Energy is proposing to completely demolish the two
existing fuse plug chambers and single concrete splitter wall within the existing auxiliary spillway.
The existing auxiliary spillway channel will be widened by about 50 feet. To complete the widening
of the existing spillway, the existing rock wall along the spillway must be excavated and about
316,000 cubic yards of material will need to be removed. Duke Energy is proposing to dispose of
about 25,000 cubic yards of excavated rock material by placing it on the downstream face of the rock
fill dam. The remaining excavated material will be loaded onto barges and deposited into the Cedar
B-52

Cliff impoundment. Upon completion of the excavation, an 11 -feet high concrete parapet wall will
be constructed along the crest of the dam and six cast -in-place Hydroplus Fusegates will be
constructed in the control section of the spillway. Temporary impacts associated with the project
consist of constructing a culvert crossing of the East Fork bypass reach immediately downstream of
the Cedar Cliff dam. Three corrugated metal pipes (110 -feet long by 12 -feet in diameter) will be
placed in the East Fork bypass reach for this crossing. The culverts will be removed when
construction is completed.
Endangered Species. On March 23, 2016, Mr. Bryan Tompkins and Ms. Susan Cameron of this
office met with representatives from Duke Energy and HDR, Inc. at the project site to determine if
suitable habitat existed within the project area for Northern Long -Eared Bat (Myotis septentrionalis)
and/or Indiana Bat (Myotis sodalis). Northern Long -Eared Bat is currently federally listed as a
threatened species; and Indiana Bat is currently federally listed as an endangered species. No known
hibernacula for these species occurs within '/4 mile of the project area and no known maternity roosts
occur within 150 -feet of the project area. However, suitable maternity roosting habitat was found to
occur along the bluff adjacent to the auxiliary spillway. For this reason, Mr. Tompkins and Ms.
Cameron made recommendations to Duke Energy for summer acoustic surveys to be conducted,
within the 3 -acre blasting and clearing area of the project, to determine presence/absence of these
species. A survey plan was established and approved by this office and surveys were conducted at
two sites within the project area from May 16 — May 18, 2016. The final report of the findings from
the survey was submitted to this office on June 13, 2016. According to the report, five Indiana Bat
and eight Northern Long -Eared Bat call files were identified. Upon review, Mr. Tompkins informed
Mr. Mularski that the survey results indicated that both species (Indiana Bat and Northern Long -
Eared Bat) were present within the project area. Because the survey results indicated potential
presence, Duke Energy has proposed the following measures to be implemented into the project
plans to avoid impacts to Indiana Bat and Northern Long -Eared Bat:
1. Trees within the 3 -acre blasting and clearing area will be cut during the winter (October 15 -
April 15) to avoid impacts to avoid the maternity roost period for Indiana Bat and Northern Long -
Eared Bat.
2. If any random trees must be cut during the summer roost period, this office will be notified and
an experienced biologist will conduct an on-site habitat assessment to determine if trees are
suitable maternity roost trees. If the tree(s) to be cut are suitable roost trees, an emergence survey
will be conducted before tree removal.
3. All potential suitable roost trees identified adjacent to the project area will be marked and
protected during clearing activities.
We appreciate the proposal to implement the conservation measures to avoid impacts to Indiana Bat
and Northern Long -Eared Bat. However, we believe an additional measure is necessary if
emergence surveys are conducted before the removal of random tree(s) during the summer maternity
roost period. If emergence surveys are conducted, and bats are observed using the tree(s) to be
removed, we recommend that this office be contacted to establish a plan for proceeding before the
tree(s) is removed. If the above stated measures are implemented into the project plans (including
our additional recommendation), we could concur with a "may affect, not likely to adversely affect"
determination for Indiana Bat and Northern Long -Eared Bat; and the consultation requirements under
section 7 of the Act have been fulfilled.
B-53

For all other federally listed species known to occur in Jackson County, we concur with the "no
effect" determination issued by Duke Energy and HDR, Inc. Therefore, we believe the requirements
under section 7 of the Act are fulfilled. However, obligations under section 7 of the Act must be
reconsidered if. (1) new information reveals impacts of this identified action that may affect listed
species or critical habitat in a manner not previously considered, (2) this action is subsequently
modified in a manner that was not considered in this review, or (3) a new species is listed or critical
habitat is determined that may be affected by the identified action.
Erosion Control. The PN included a statement that erosion control would be addressed as
established in the Shoreline Management Plan for the project. We are not aware of any specific
information in the Shoreline Management Plan concerning erosion control measures for a reservoir
drawdown of the magnitude necessary for the proposed project. We recommend that Duke Energy
develop a plan to monitor and mitigate for erosion along the exposed reservoir banks. After rain
events, areas near storm water outfall pipes or culverts that release high velocity discharges onto
exposed banks should be inspected for erosive reels or mass wasting. The plan should include
measures that will be implemented should erosive/mass wasting areas be found that are contributing
sediment to the river channel. We recommend the use of straw bales or other devices at problem
sites to decrease velocity of water, decrease erosion, and minimize the amount of sediment released.
Any problem areas should be documented. Information on documented problem areas should be
maintained to focus efforts on erosion control during any future drawdowns.
Reservoir Drawdown. The PN indicated that the water level in the reservoir will be drawn down
about 30 feet for a duration of 14 to 16 months to facilitate construction of the spillway
modifications. The PN did not include a drawdown schedule for the project. To ensure that aquatic
resources within the reservoir are not adversely affected by the drawdown of the reservoir, we
recommend that Duke Energy consult and reach agreement with the USFWS, other natural resource
agencies, and regulatory agencies concerning any reasonable and necessary measures to minimize the
impacts of the drawdown.
We appreciate the opportunity to provide these comments. If we can be of assistance or if you have
any questions, please do not hesitate to contact Mr. Bryan Tompkins of our staff at 828/258-3939,
Ext. 240. In any future correspondence concerning this project, please reference our Log Number
4-2-16-547.
Sincerely,
- - original signed - -
Janet Mizzi
Field Supervisor
E -Copy: Mr. Eric Mularski, HDR, Inc.
Mr. Steve Johnson, Duke Energy Carolinas, LLC
B-54

North Carolina Department of Natural and Cultural Resources
State Historic Preservation Office
Ramona M. Bartos, Administrator
Governor Pat McCrory
Secretary Susan Kluttz
August 30, 2016
Office of Archives and History
Deputy Secretary Kevin Cherry
Christy Churchill Christy.Churchill@ duke-eneEgy.com
Duke Energy
550 South Tryon Street
Charlotte, NC 28202
Re: Cedar Cliff Development Auxiliary Spillway Upgrade Project, East Fork Hydroelectric Project,
FERC 2698-033, Jackson County, ER 16-1388
Dear Ms. Churchill:
Thank you for your letter of August 5, 2016, regarding the above -referenced undertaking. We have
reviewed the materials submitted and offer the following comments.
Based on our knowledge of the area, it is unlikely that any archaeological resources that may be eligible for
inclusion in the National Register of Historic Places will be adversely affected by the project.
The East Fork Hydroelectric Project is eligible for listing in the National Register of Historic Places
(NRHP) under Criterion A for "Engineering." However, when the East Fork Hydroelectric Project was
evaluated in 2014, the Cedar Cliff Development (JK0729), was determined to be a non-contributing
element of the historic property. Therefore, proposed improvements to the Cedar Cliff Development dam
will not diminish the integrity for which the East Fork Hydroelectric Project is considered to be historic.
Before improvements to the dam at Cedar Cliff are initiated, we request photographs thoroughly
documenting the current condition of the dam and its surroundings. Please refer to our guidelines for labeling
and submitting digital images at http://www.lipo.ncdcr.gov/digital!NCI-CPO_ Digital_ Photo_Policy.html.
The above comments are made pursuant to Section 106 of the National Historic Preservation Act and the
Advisory Council on Historic Preservation's Regulations for Compliance with Section 106 codified at 36
CFR Part 800.
Location: 109 East Jones Street, Raleigh NC 27601 Mailing Address: 4617 Mail Service Center, Raleigh NC 27699-4617 Telephone/Fax: [phone]-6599
B-55

Thank you for your cooperation and consideration. If you have questions concerning the above comment,
contact Renee Gledhill -Earley, environmental review coordinator, at 919-807-6579 or
environmental.review ca,iiedcr.gov. In all future communication concerning this project, please cite the
above referenced tracking number.
Sincerely,
Ramona A Bartos
cc: John Eddy, John.Edd Z duke-ener .com
Jon Wise, [e-mail]
Tim Banta, [e-mail]
David Brown, ACOE
B-56

Environmental Report
Cedar Cliff Auxiliary Spillway Upgrade
Annp-nriiy C.
May 2019 1 C-1

PAT MCCRORY
DONALD R. VAN .DER VAART
DWR # 2016-0742 reissuance
Jackson. County .
Due Energy Carolinas, LLC
Attn: Mr. Jonathan Wise
400 S. Church St
Charlotte NC 28202
Subject: Approval of Individual 4101 Water Quality Certification with Additional Conditions
'Cedar Cliff Development Auxiliary Spillway Upgrade Project
USAGE Action 1D. Na. SAW -20.15-025.43
........
Dear Mr. Wise:
Attached hereto is a copy of Certification No. WQC004077 issued to Mr. Jonathan Wise and
Duke Energy Carolinas, LLC, dated December 6, 2016. This Certification replaces the
Certification issued on November 10, 2016 to account for additional open water impacts
from the 1951 Access Road Connection. Please note that you should get any other federal,
state or local permits before proceeding with the subject project, including those required
by (but not limited to) Sediment and Erosion Control, Non -Discharge, and Water Supply
Watershed regulations.
This approval and its conditions are final and binding unless contested. This Certification
can be contested as provided in General Statute 150E by filing a written petition for an
...........
administrative hearing to the Office of Administrative Hearings (hereby known as OAH)
within sixty j60j calendar days. ...................
A petition form maybe obtained from the OAH at htt : www.ncoah.corn or by calling the
OAH Clerk's Office at [phone] for information. A petition is considered filed when
the original and one [1J copy along with any applicable OAH filing fee is received in the OAH
during normal office hours (Monday through Friday between 8:00am and 5:00pm, excluding
official state holidays).
The petition may be faxed to the OAH at [phone], provided the original and one copy.of
the petition along with any appIicab€e DAH filing fee is received by the OAH within five. (5)
business. days following the faxed transmission.
Si Tec 0 NL)T le Carolina - Niv ironttoentaI Quit iity ; W;' t -,r Resources
1617 MaiS sen ice enter Ralc igh. lvottll C aaralini 27699-1517
979 807 6300
�?3x;'?'��s�f4;1.�Sr1�1:-�`�`•L1y_3i���1`���:?iFf4�dix'.3�'Y", ?3„�r"" .

Cedar Cliff D-evelopment Auxiliary $plllwaw upgrade Prcpject
DWR N 16-07 relssvance
Individual Certification #4077
Page 7 of 7
Mailing ,Wre5s for the CAH'
If sen ding u40 US Plastof Service.
Office of Ad m i n i strat ive H ear -lin 5
6714 Mail 5 ervice Cent ar
If sending vier d0very 5Ervice (UPS,
fedEX, Ott);
Office of Ad m i nistrat ive Hearings
1711 New Hope Church RDa4
Raleigh, NC 27699-6714 Raleigh, NC 27609-6285
one Ill copy of th-e petition My S1 a Iso be served to DEQ_
Sam Hayes, General C€runwl
De.part ment of E nvI re rrmenta I Quality
1601 Mail Service Center
Raleigh, NC 27699-16D1
Unless such a petition is filed, th1s Certificati cn sha I I b e fi n a 1 a nd h I ndirkg,
This c-ertif}-cation com plete 5 t he review of t he Dlaisloh Und or sect ion 40 1 of t he Cl ea n Wat e r A(; t
aind ISA NCAC D2 H , 0500. Contact Su a Homewood at 336-776-9693 or
sue, hom ewood @ ncclen r-gov if you h ave ally q uestion s or con Berns.
Si ncerelV,
Daren Ai ins, S upervi 50
401 & Buffer Permitting Branch
cc; Mr. Erie M ularskir HDR Engineering Inc, (via email)
David grown, UMCE AsheviRe Regulato rV Fieild Off Ice
Todd Bower% EPA, Sam N ur n Federal Center, 61 Forsyth Street SW, Atiant@, GA 9030a
DWR W SRQ 401 file
Fil-a Cop* (Laserfich e)
rilert8 me: i�lj��?��d�r�liff$�d Fway(lacksanj AOi IC reissue
C-3

Cedar Cliff Development Auxiliary Spillway Upgrade Project
DWR # 16-0742 relssuance
Individual Certification ##4077
.Page 3 of 7
NORTH CAROLINA 401 WATER QUALITY CERTIFICATION
CERTIFICATION #WQC004077 is issued in conformity with the requirements of Section 401,
Public Laws 92-500 and 95-217 of the United States and subject to North Carolina's Regulations in
15A NCAC 02H .0500, to Mr. Jonathan Wise and Duke Energy Carolinas, LLC, who have
authorization for the impacts listed below, as described within your application received by the
N.C. Division of Water Resources (Division) on July 29, 2016 with additional information received
October 20, 2016, and November 15, 2016, and by Public Notice issued by the U. S. Army Corps of
Engineers and received by the Division on August 12, 2015.
The State of North Carolina certifies that this activity will not violate the applicable portions of
Sections 301, 302, 303, 306, 307 of the Public Laws 92-500 and PL 95-217 if conducted in
accordance with the application, the supporting documentation, and conditions hereinafter set.
forth.
This approval requires you to follow the. conditions.listed in the certification .beIO
Conditions of Certification:
1. The following impacts are hereby approved provided that all of the other specific and
general conditions of the Certification are met. No other impacts are approved, including .
incidental impacts. [15A NCAC Q2H ,0506(b) and/or (c))
Type. of Impact
Amount Approved
Amount Approved
(units)
(units)
Permanent
i Temporary
Stream
I Site 1
0 (linear feet)
110 (linear feet)
Open Waters
Site OWI m
0 (acres)
E 0.5 (acres)
Site OW2
9.6 (acres)0
(acres) -�
-
Site OW3
0 (acres)
50.8 (acres)
— _
Site OW4
_
0,01 (acres)
0 (acres)
Site OW5 —1951
0.22 (acres)
0 (acres)
access connector rd
2. The NC Wildlife Resource Commission (NCWRC) shall be consulted to determine the
preferred rock spoil locations within the lake.
3. A reservoir drawdown plan shall tae provided. to the Division for approval 3Q calendar days
prior to submittal to FERC. ...................... ..... .... . . ... ..................................
.................................................................................... ................... ............................
C-4

Cedar Cliff Deveiopmern.AuxiIlia ry 5pi€Tway Upgrade Project
DWR # 16-0742 reissuance
Individual Certification #14077
Page 4 of 7
4. The Permittee shall maintain compliance with all conditions of DWR Certification No. 3831
(DWR Project #2003-1112).
5. No waste, spoil, solids, or fill of any kind shall occur in wetlands, waters, or riparian areas
beyond the footprint of the impacts depicted in the Pre-Construction Notification €or this
project. All construction activities, including the design, installation, operation, and
maintenance of sediment and erosion control Best Management Practices shall be
performed so that no violations of state water quality standards, statutes, or rules occur.
Approved plans and specifications for this project are incorporated by reference and are
enforceable parts of this permit. [15A NCAC 02H.0501 and .0502]
6. The Permittee shall secure approval of an Erosion and Sediment Control Plan prior to
commencing drawdown of the water level in the reservoir. Sediment and erosion control
measures shall not be installed in wetlands or waters with the exception of turbidity
curtains. All sediment and erosion control devices shall be removed and the natural grade
.................. .
restored within two (2) months of the date that the Division of Energy, Mineral and Land
Resources (DEMI_R) has released the specific area within the project. [15A NCAC 02H .0501
and ,0502]
7. Erosion and sediment control practices must be in full compliance with all specifications
governing the proper design, installation and operation and maintenance of such Best
Management Practices. if applicable, the project must comply with the specific conditions
and requirements of the NPDES Construction Stormwater Permit issued to the site and the
following requirements [15A NCAC 02H .0506(b)(3) and (c)(3)):
a. Design, installation, operation, and maintenance of the sediment and erosion
control measures must be such that they equal or exceed the requirements specified
in the most recent version of the North Carolina Sediment and Erosion Control .........
Manual. The devices shall be maintained on all construction sites, borrow sites, and
waste pile (spoil) projects, including contractor-owned or ]eased borrow pits ...................
associated with the project.
b. For borrow pit sites, the erosion and sediment control measures must be designed,
installed, operated, and maintained in accordance with the most recent version of
the North Carolina Surface Mining Manual.
c. Reclamation measures and implementation must comply with the reclamation in
accordance with the requirements of the Sedimentation Pollution Control Act and
the Mining Act of 1971.
d. Sufficient materials required for stabilization and/or repair of erosion control
.measures and star uvater routing and treatment shall be on site at all times,
................. ............................................................................... ...........................:.
C-5

Cedar Cliff Development.Auxiliary Spillway Upgrade Project
DwR # 16-0742 reissuance
Individual Certification #4077
Page S of 7
6. An NPDES Construction Stormwater Permit is required for construction projects that disturb...
one (1) or more acres of land. This Permit allows stormwater to be discharged during land ..........
disturbing construction activities as stipulated in the conditions of the permit. if your ................
project is covered by this permit, full compliance with permit conditions including the
erosion & sedimentation control plan, inspections and maintenance, self-monitoring, record
keeping and reporting requirements is required. A copy of the general permit
(NCG010000), inspection log sheets, and other information may be found at:
hit : deg, nc.ov about divisions ener -mineral-land-resources enemy-rriireral-iand-
ermits starn�water- ermits construction-svv. 15A NCAC 02H .0506(b)(5) and (c)(5)]
7. All work in or adjacent to stream waters shall be conducted so that the flowing stream does
not come in contact with the disturbed area. Approved best management practices from the
most current version of the NC Sediment and Erosion Control Manual, or the NC DOT
Construction and Maintenance Activities Manual, such as sandbags, rock berms, cofferdams,
and other diversion structures shall be used to minimize excavation in flowing water. (154
NCAC 02H .0506(b)(3) and (c)(3)]
S. if concrete is used during the construction, then all necessary measures shall be taken to
prevent direct contact between uncured or curing concrete and waters of the state. Water
that inadvertently contacts uncured concrete shall not be discharged to waters of the state
due to the potential for elevated pH and possible aquatic life/fish kills. [15A NCAC 02B .0200)
9. Temporary culverts required for this project shall be installed in such a manner that the
original stream profiles are not altered and to allow for aquatic life movement during low ....
flows. Existing stream dimensions (including the cross section dimensions, pattern and
longitudinal profile) must be maintained above and below locations of each culvert.
10. All temporary fill and culverts shall be removed and the impacted area returned to natural
conditions, within 60 days of the determination that the temporary impact is no longer
necessary. The impacted areas shall be restored to original grade, including the stream's
...............::
original cross sectional dimensions, plan form pattern, and longitudinal bed and bed profile,
and the site shall be stabilized with natural woody vegetation (except approved maintenance
areas) and restored to prevent erosion. [15A NCAC 02H .0506(b)(2) and (c){2)]
11. All temporary pipes/culverts/riprap pads etc, shall be installed in all streams as outlined in the
most recent edition of the North Carolina Sediment and Erosion Control Planning and Design
Manual so as not to restrict stream flow or cause dis-equilibrium. [15A NCAC 02H .05060)(2)
and (G.)21.
....................................................................................................................................
C-6

Cedar Cliff Development Auxiliary Spillway Upgrade Project
DWR # 16-0742 reissuance
Individual Certification #4077
Page 6 of 7
12. Any riprap required for proper culvert placement, stream stabilization, or restoration of
temporarily disturbed areas shall be restricted to the area directly impacted by the approved
construction activity. All riprap shall be buried and/or "keyed in" such that the original ................
stream elevation and streambank contours are restored and maintained. Placement of riprap
or other approved materials shall not result in de -stabilization of the stream bed or banks
upstream or downstream of the area, [15A NCAC 02H .0506(b)(2)]
13. Any riprap used for stream stabilization shall be of a size and density to prevent movement by
wave action, current action, or stream flows and consist of clean rock or masonry material
free of debris or toxic pollutants. Riprap shall not be installed in the streambed except in
specific areas required for velocity control and to ensure integrity of bank stabilization
measures. [15A NCAC 02H .0506(b)j2)]
14. This Certification does not relieve the applicant of the responsibility to obtain all other
required Federal, State, or Local approvals.
................
15. Mr. Jonathan Wise and Duke Energy Carolinas, LLC shall conduct construction activities in a
manner consistent with State water quality standards (including any requirements resulting
from compliance with section 303(d) of the Clean Water Act) and any other appropriate
requirements of State and Federal law. [15A NCAC 02B .0200] if the Division determines that
such standards or laws are not being met (including the failure to sustain a designated or
achieved use) or that State or federal law is being violated, or that further conditions are
necessary to assure compliance, the Division may reevaluate and modify this Certification.
Before modifying the Certification, the Division shall notify Mr. Jonathan Wise and Duke
Energy Carolinas, LLC and the U.S. Army Carps of Engineers, provide public notice in
accordance with 15A NCAC 02H .0543 and provide opportunity for public hearing in
accordance with 15A NCAC 02H .0504. Any new or revised conditions shall be provided to
Mr. Jonathan Wise and Duke Energy Carolinas, LLC in writing, shall be provided to the U.S.
Army Corps of Engineers for reference in any Permit issued pursuant to Section 404 of the ........
Clean Water Act, and shall also become conditions of the 404 Permit for the project. ............
16. This approval is for the purpose and design described in your application and as described in
the Public Notice. The pians and specifications for this project are incorporated by reference
and are an enforceable part of the Certification. if you change your project, you must notify
the Division and you may be required to submit a new application package with the
appropriate fee. if the property is sold or transferred, the new owner must be given a copy of
this Certification and is responsible for complying with all conditions. Any new owner must
notify the Division and request the Certificationbe issued in their name. [15A NCAC 02H
.0501 and ..0502] ................................ .. ....................

Cedar Cliff Deweloprn ent Auxillpry 5pillw&y Up8r2de Project
DWR If 1"742 reissuarlee
Ind iwidui)l CertiFcation 4r4O77
Page 7 of 7
17. Th a a pp I icer~ t an d/or a uta o rued ape nt sh a I I p rcivide a cornpi Erted Ce rtifl Cate of Com PI eti o n
For rn to the DW R 401 & 8 uffer Perm itti ng U nit with i n to n days -of p rojed co rn plet ion
(avail -able at: htt = r5edenr_s3.amazoaaws.comJs3fs-
yu bk/WatetIP OCIuality/Su rfa ce%2 OW ater%20Protecti on 1401/Cens%20an d%2 OF-erm itVCe r
t ifrcate0fComR Ietio o f eb 2 015. d-oc ). 115A N CHIC 0 2 H ,0502�f)] -
18. Th i s certificati o nrad Cyt s perm'$Sign to th e D irs�to r o r a rr aut hor i71=d ri-p rL-,;Fn rat Ove of lh e
Di rector, u pon t h e p resentati o n of prope r cre deflti a I s, t o e n ter the prope rty du ring n orma I
Business hours. (15A NCAC 02H ,O5 -02(e)]
Th is ap prowa I to proceed with -you r proposed Fm pact5 or to co ncfuct i M pacts to avaters as
depicted i ri your application shall expire upon expiration of the 404 permit, The con d it ions in
effect o n the d ate o f issoerrce sh a I I rem atn in effect for t h e li fe -of th a project, rega rdiess of the
exp iration date of t his Certifi ratio n_ J15A N CAC 02H .0507 d �J 2) and 15A NCAC 02 H _05061
N orr-corn p I iance with or viol ation of th a con-ditio ns he rein set forth m ay result in revoc ation of
th i 5 Certificat ion arh d rrray a Iso resu It i n cri m i rwal a rid/or c ivi I pe n alti es,
This the 9th d -ay of December, 20 1.6
Ire rk H ilggin 5, Su pe rhriso
40 1 & Buffe r Pe rrn it ti ng Bran ch
KAHIsh
VVQCO04O77
C-8

PAT MCCRORY
DONALD R. VAN .DER VAART
DWR # 2016-0742 reissuance
Jackson. County .
Due Energy Carolinas, LLC
Attn: Mr. Jonathan Wise
400 S. Church St
Charlotte NC 28202
Subject: Approval of Individual 4101 Water Quality Certification with Additional Conditions
'Cedar Cliff Development Auxiliary Spillway Upgrade Project
USAGE Action 1D. Na. SAW -20.15-025.43
........
Dear Mr. Wise:
Attached hereto is a copy of Certification No. WQC004077 issued to Mr. Jonathan Wise and
Duke Energy Carolinas, LLC, dated December 6, 2016. This Certification replaces the
Certification issued on November 10, 2016 to account for additional open water impacts
from the 1951 Access Road Connection. Please note that you should get any other federal,
state or local permits before proceeding with the subject project, including those required
by (but not limited to) Sediment and Erosion Control, Non -Discharge, and Water Supply
Watershed regulations.
This approval and its conditions are final and binding unless contested. This Certification
can be contested as provided in General Statute 150E by filing a written petition for an
...........
administrative hearing to the Office of Administrative Hearings (hereby known as OAH)
within sixty j60j calendar days. ...................
A petition form maybe obtained from the OAH at htt : www.ncoah.corn or by calling the
OAH Clerk's Office at [phone] for information. A petition is considered filed when
the original and one [1J copy along with any applicable OAH filing fee is received in the OAH
during normal office hours (Monday through Friday between 8:00am and 5:00pm, excluding
official state holidays).
The petition may be faxed to the OAH at [phone], provided the original and one copy.of
the petition along with any appIicab€e DAH filing fee is received by the OAH within five. (5)
business. days following the faxed transmission.
Si Tec 0 NL)T le Carolina - Niv ironttoentaI Quit iity ; W;' t -,r Resources
1617 MaiS sen ice enter Ralc igh. lvottll C aaralini 27699-1517
979 807 6300
�?3x;'?'��s�f4;1.�Sr1�1:-�`�`•L1y_3i���1`���:?iFf4�dix'.3�'Y", ?3„�r"" .

Cedar Cliff D-evelopment Auxiliary $plllwaw upgrade Prcpject
DWR N 16-07 relssvance
Individual Certification #4077
Page 7 of 7
Mailing ,Wre5s for the CAH'
If sen ding u40 US Plastof Service.
Office of Ad m i n i strat ive H ear -lin 5
6714 Mail 5 ervice Cent ar
If sending vier d0very 5Ervice (UPS,
fedEX, Ott);
Office of Ad m i nistrat ive Hearings
1711 New Hope Church RDa4
Raleigh, NC 27699-6714 Raleigh, NC 27609-6285
one Ill copy of th-e petition My S1 a Iso be served to DEQ_
Sam Hayes, General C€runwl
De.part ment of E nvI re rrmenta I Quality
1601 Mail Service Center
Raleigh, NC 27699-1SD1
Unless such a petition is filed, th1s Certificati cn sha I I b e fi n a 1 a nd h I ndirkg,
This c-ertif}-cation com plete 5 t he review of t he Dlaisloh Und or sect ion 40 1 of t he Cl ea n Wat e r A(; t
aind ISA NCAC 02 H , 0500. Contact Su a Homewood at 336-776-9693 or
sue, hom ewood @ ncclen r-gov if you h ave ally q uestion s or con Berns.
Si ncerelV,
Daren Ai ins, S upervi 50
401 & Buffer Permitting Branch
cc; Mr. Erie M ularskir HDR Engineering Inc, (via email)
David grown, UMCE AsheviRe Regulato rV Fieild Off Ice
Todd Bower% EPA, Sam N ur n Federal Center, 61 Forsyth Street SW, Atiant@, GA 9030a
DWR W SRQ 401 file
Fil-a Cop* (Laserfich e)
rilert8 me: i�lj��?��d�r�liff$�d Fway(lacksanj AOi IC reissue
C-10

Cedar Cliff Development Auxiliary Spillway Upgrade Project
DWR # 16-0742 relssuance
Individual Certification ##4077
.Page 3 of 7
NORTH CAROLINA 401 WATER QUALITY CERTIFICATION
CERTIFICATION #WQC004077 is issued in conformity with the requirements of Section 401,
Public Laws 92-500 and 95-217 of the United States and subject to North Carolina's Regulations in
15A NCAC 02H .0500, to Mr. Jonathan Wise and Duke Energy Carolinas, LLC, who have
authorization for the impacts listed below, as described within your application received by the
N.C. Division of Water Resources (Division) on July 29, 2016 with additional information received
October 20, 2016, and November 15, 2016, and by Public Notice issued by the U. S. Army Corps of
Engineers and received by the Division on August 12, 2015.
The State of North Carolina certifies that this activity will not violate the applicable portions of
Sections 301, 302, 303, 306, 307 of the Public Laws 92-500 and PL 95-217 if conducted in
accordance with the application, the supporting documentation, and conditions hereinafter set.
forth.
This approval requires you to follow the. conditions.listed in the certification .beIO
Conditions of Certification:
1. The following impacts are hereby approved provided that all of the other specific and
general conditions of the Certification are met. No other impacts are approved, including .
incidental impacts. [15A NCAC Q2H ,0506(b) and/or (c))
Type. of Impact
Amount Approved
Amount Approved
(units)
(units)
Permanent
i Temporary
Stream
I Site 1
0 (linear feet)
110 (linear feet)
Open Waters
Site OWI m
0 (acres)
E 0.5 (acres)
Site OW2
9.6 (acres)0
(acres) -�
-
Site OW3
0 (acres)
50.8 (acres)
— _
Site OW4
_
0,01 (acres)
0 (acres)
Site OW5 —1951
0.22 (acres)
0 (acres)
access connector rd
2. The NC Wildlife Resource Commission (NCWRC) shall be consulted to determine the
preferred rock spoil locations within the lake.
3. A reservoir drawdown plan shall tae provided. to the Division for approval 3Q calendar days
prior to submittal to FERC. ...................... ..... .... . . ... ..................................
.................................................................................... ................... ............................
C-11

Cedar Cliff Deveiopmern.AuxiIlia ry 5pi€Tway Upgrade Project
DWR # 16-0742 reissuance
Individual Certification #14077
Page 4 of 7
4. The Permittee shall maintain compliance with all conditions of DWR Certification No. 3831
(DWR Project #2003-1112).
5. No waste, spoil, solids, or fill of any kind shall occur in wetlands, waters, or riparian areas
beyond the footprint of the impacts depicted in the Pre-Construction Notification €or this
project. All construction activities, including the design, installation, operation, and
maintenance of sediment and erosion control Best Management Practices shall be
performed so that no violations of state water quality standards, statutes, or rules occur.
Approved plans and specifications for this project are incorporated by reference and are
enforceable parts of this permit. [15A NCAC 02H.0501 and .0502]
6. The Permittee shall secure approval of an Erosion and Sediment Control Plan prior to
commencing drawdown of the water level in the reservoir. Sediment and erosion control
measures shall not be installed in wetlands or waters with the exception of turbidity
curtains. All sediment and erosion control devices shall be removed and the natural grade
.................. .
restored within two (2) months of the date that the Division of Energy, Mineral and Land
Resources (DEMI_R) has released the specific area within the project. [15A NCAC 02H .0501
and ,0502]
7. Erosion and sediment control practices must be in full compliance with all specifications
governing the proper design, installation and operation and maintenance of such Best
Management Practices. if applicable, the project must comply with the specific conditions
and requirements of the NPDES Construction Stormwater Permit issued to the site and the
following requirements [15A NCAC 02H .0506(b)(3) and (c)(3)):
a. Design, installation, operation, and maintenance of the sediment and erosion
control measures must be such that they equal or exceed the requirements specified
in the most recent version of the North Carolina Sediment and Erosion Control .........
Manual. The devices shall be maintained on all construction sites, borrow sites, and
waste pile (spoil) projects, including contractor-owned or ]eased borrow pits ...................
associated with the project.
b. For borrow pit sites, the erosion and sediment control measures must be designed,
installed, operated, and maintained in accordance with the most recent version of
the North Carolina Surface Mining Manual.
c. Reclamation measures and implementation must comply with the reclamation in
accordance with the requirements of the Sedimentation Pollution Control Act and
the Mining Act of 1971.
d. Sufficient materials required for stabilization and/or repair of erosion control
.measures and star uvater routing and treatment shall be on site at all times,
................. ............................................................................... ...........................:.
C-12

Cedar Cliff Development.Auxiliary Spillway Upgrade Project
DwR # 16-0742 reissuance
Individual Certification #4077
Page S of 7
6. An NPDES Construction Stormwater Permit is required for construction projects that disturb...
one (1) or more acres of land. This Permit allows stormwater to be discharged during land ..........
disturbing construction activities as stipulated in the conditions of the permit. if your ................
project is covered by this permit, full compliance with permit conditions including the
erosion & sedimentation control plan, inspections and maintenance, self-monitoring, record
keeping and reporting requirements is required. A copy of the general permit
(NCG010000), inspection log sheets, and other information may be found at:
hit : deg, nc.ov about divisions ener -mineral-land-resources enemy-rriireral-iand-
ermits starn�water- ermits construction-svv. 15A NCAC 02H .0506(b)(5) and (c)(5)]
7. All work in or adjacent to stream waters shall be conducted so that the flowing stream does
not come in contact with the disturbed area. Approved best management practices from the
most current version of the NC Sediment and Erosion Control Manual, or the NC DOT
Construction and Maintenance Activities Manual, such as sandbags, rock berms, cofferdams,
and other diversion structures shall be used to minimize excavation in flowing water. (154
NCAC 02H .0506(b)(3) and (c)(3)]
S. if concrete is used during the construction, then all necessary measures shall be taken to
prevent direct contact between uncured or curing concrete and waters of the state. Water
that inadvertently contacts uncured concrete shall not be discharged to waters of the state
due to the potential for elevated pH and possible aquatic life/fish kills. [15A NCAC 02B .0200)
9. Temporary culverts required for this project shall be installed in such a manner that the
original stream profiles are not altered and to allow for aquatic life movement during low ....
flows. Existing stream dimensions (including the cross section dimensions, pattern and
longitudinal profile) must be maintained above and below locations of each culvert.
10. All temporary fill and culverts shall be removed and the impacted area returned to natural
conditions, within 60 days of the determination that the temporary impact is no longer
necessary. The impacted areas shall be restored to original grade, including the stream's
...............::
original cross sectional dimensions, plan form pattern, and longitudinal bed and bed profile,
and the site shall be stabilized with natural woody vegetation (except approved maintenance
areas) and restored to prevent erosion. [15A NCAC 02H .0506(b)(2) and (c){2)]
11. All temporary pipes/culverts/riprap pads etc, shall be installed in all streams as outlined in the
most recent edition of the North Carolina Sediment and Erosion Control Planning and Design
Manual so as not to restrict stream flow or cause dis-equilibrium. [15A NCAC 02H .05060)(2)
and (G.)21.
....................................................................................................................................
C-13

Cedar Cliff Development Auxiliary Spillway Upgrade Project
DWR # 16-0742 reissuance
Individual Certification #4077
Page 6 of 7
12. Any riprap required for proper culvert placement, stream stabilization, or restoration of
temporarily disturbed areas shall be restricted to the area directly impacted by the approved
construction activity. All riprap shall be buried and/or "keyed in" such that the original ................
stream elevation and streambank contours are restored and maintained. Placement of riprap
or other approved materials shall not result in de -stabilization of the stream bed or banks
upstream or downstream of the area, [15A NCAC 02H .0506(b)(2)]
13. Any riprap used for stream stabilization shall be of a size and density to prevent movement by
wave action, current action, or stream flows and consist of clean rock or masonry material
free of debris or toxic pollutants. Riprap shall not be installed in the streambed except in
specific areas required for velocity control and to ensure integrity of bank stabilization
measures. [15A NCAC 02H .0506(b)j2)]
14. This Certification does not relieve the applicant of the responsibility to obtain all other
required Federal, State, or Local approvals.
................
15. Mr. Jonathan Wise and Duke Energy Carolinas, LLC shall conduct construction activities in a
manner consistent with State water quality standards (including any requirements resulting
from compliance with section 303(d) of the Clean Water Act) and any other appropriate
requirements of State and Federal law. [15A NCAC 02B .0200] if the Division determines that
such standards or laws are not being met (including the failure to sustain a designated or
achieved use) or that State or federal law is being violated, or that further conditions are
necessary to assure compliance, the Division may reevaluate and modify this Certification.
Before modifying the Certification, the Division shall notify Mr. Jonathan Wise and Duke
Energy Carolinas, LLC and the U.S. Army Carps of Engineers, provide public notice in
accordance with 15A NCAC 02H .0543 and provide opportunity for public hearing in
accordance with 15A NCAC 02H .0504. Any new or revised conditions shall be provided to
Mr. Jonathan Wise and Duke Energy Carolinas, LLC in writing, shall be provided to the U.S.
Army Corps of Engineers for reference in any Permit issued pursuant to Section 404 of the ........
Clean Water Act, and shall also become conditions of the 404 Permit for the project. ............
16. This approval is for the purpose and design described in your application and as described in
the Public Notice. The pians and specifications for this project are incorporated by reference
and are an enforceable part of the Certification. if you change your project, you must notify
the Division and you may be required to submit a new application package with the
appropriate fee. if the property is sold or transferred, the new owner must be given a copy of
this Certification and is responsible for complying with all conditions. Any new owner must
notify the Division and request the Certificationbe issued in their name. [15A NCAC 02H
.0501 and ..0502] ................................ .. ....................

Cedar Cliff Deweloprn ent Auxillpry 5pillw&y Up8r2de Project
DWR If 1"742 reissuarlee
Ind iwidui)l CertiFcation 4r4O77
Page 7 of 7
17. Th a a pp I icer~ t an d/or a uta o rued ape nt sh a I I p rcivide a cornpi Erted Ce rtifl Cate of Com PI eti o n
For rn to the DW R 401 & B uffer Perm itti ng U nit with i n to n days -of p rojed co rn plet ion
(avail -able at: htt = r5edenr_s3.amazoaaws.comJs3fs-
yu bk/WatetIP OCIuality/Su rfa ce%2 OW ater%20Protecti on 1401/Cens%20an d%2 OF-erm itVCe r
t ifrcate0fComR Ietio o f eb 2 015. d-oc ). 115A N CHIC 0 2 H ,0502�f)] -
18. Th i s certificati o nrad Cyt s perm'$Sign to th e D irs�to r o r a rr aut hor i71=d ri-p rL-,;Fn rat Ove of lh e
Di rector, u pon t h e p resentati o n of prope r cre deflti a I s, t o e n ter the prope rty du ring n orma I
Business hours. (15A NCAC 02H ,O5 -02(e)]
Th is ap prowa I to proceed with -you r proposed Fm pact5 or to co ncfuct i M pacts to avaters as
depicted i ri your application shall expire upon expiration of the 404 permit, The con d it ions in
effect o n the d ate o f issoerrce sh a I I rem atn in effect for t h e li fe -of th a project, rega rdiess of the
exp iration date of t his Certifi ratio n_ J15A N CAC 02H .0507 d �J 2) and 15A NCAC 02 H _05061
N orr-corn p I iance with or viol ation of th a con-ditio ns he rein set forth m ay result in revoc ation of
th i 5 Certificat ion arh d rrray a Iso resu It i n cri m i rwal a rid/or c ivi I pe n alti es,
This the 9th d -ay of December, 20 1.6
Ire rk H ilggin 5, Su pe rhriso
40 1 & Buffe r Pe rrn it ti ng Bran ch
KAHIsh
VVQCO04O77
C-15

Environmental Report OR
Cliff Auxiliary Spillway Upgrade
May 2019 1 D-1

United States Department of the Interior
FISH AND WILDLIFE SERVICE
Asheville Field Office
160 Zillicoa Street
Asheville, North Carolina 28801
August 19, 2016
Mr. David Brown
Asheville Regulatory Field Office
U.S. Army Corps of Engineers
151 Patton Avenue, Room 208
Asheville, North Carolina 28801-5006
Dear Mr. Brown:
This is the report of the U.S. Fish and Wildlife Service and the Department of the Interior on the
U.S. Army Corps of Engineers' (Corps) Public Notice (PN) of an Individual Permit Application
(IPA) submitted by Mr. Jonathan Ray of Duke Energy Carolinas, LLC (Duke Energy), represented
by Mr. Eric Mularski of HDR Engineering, Inc., to impact about 110 linear feet of stream impacts,
51.3 -acres of temporary open water impacts, and 9.61 -acres of permanent open water impacts within
the East Fork Hydroelectric Project Area, in Jackson County, North Carolina. Information for this
report is based on multiple site visits conducted by staff of this office with representatives from Duke
Energy and HDR, and a review of the PN issued by the Corps. The report is submitted in accordance
with the provisions of the National Environmental Policy Act; Fish and Wildlife Coordination Act, as
amended (16 U.S.C. 661-667e); and section 7 of the Endangered Species Act of 1973, as amended
(16 U.S.C. 1531-1543) (Act).
According to the information presented, the proposed project consists of modifying the existing
Cedar Cliff dam auxiliary spillway and main dam berm to safely pass the calculated Probable
Maximum Flood (PMF), which is defined as the Inflow Design Flood (IDF), without overtopping the
Cedar Cliff dam. The PMF peak inflow of the Cedar Cliff project is about 192,000 cfs, which was
approved by FERC on June 22, 1994. Based on this and engineering calculations, the auxiliary
spillway is incapable of passing the PMF and needs to be increased by about 112,000 cfs to prevent
overtopping the dam. The FERC identified the IDF as the PMF in correspondence to Duke Energy
dated April 24, 2014, and requested that the project be modified to safely pass all flows up to and
including the IDF. To meet this objective, Duke Energy is proposing to completely demolish the two
existing fuse plug chambers and single concrete splitter wall within the existing auxiliary spillway.
The existing auxiliary spillway channel will be widened by about 50 feet. To complete the widening
of the existing spillway, the existing rock wall along the spillway must be excavated and about
316,000 cubic yards of material will need to be removed. Duke Energy is proposing to dispose of
about 25,000 cubic yards of excavated rock material by placing it on the downstream face of the rock
fill dam. The remaining excavated material will be loaded onto barges and deposited into the Cedar
D-2

Cliff impoundment. Upon completion of the excavation, an 11 -feet high concrete parapet wall will
be constructed along the crest of the dam and six cast -in-place Hydroplus Fusegates will be
constructed in the control section of the spillway. Temporary impacts associated with the project
consist of constructing a culvert crossing of the East Fork bypass reach immediately downstream of
the Cedar Cliff dam. Three corrugated metal pipes (110 -feet long by 12 -feet in diameter) will be
placed in the East Fork bypass reach for this crossing. The culverts will be removed when
construction is completed.
Endangered Species. On March 23, 2016, Mr. Bryan Tompkins and Ms. Susan Cameron of this
office met with representatives from Duke Energy and HDR, Inc. at the project site to determine if
suitable habitat existed within the project area for Northern Long -Eared Bat (Myotic septentrionalis)
and/or Indiana Bat (Myotis sodalis). Northern Long -Eared Bat is currently federally listed as a
threatened species; and Indiana Bat is currently federally listed as an endangered species. No known
hibernacula for these species occurs within 1/4 mile of the project area and no known maternity roosts
occur within 150 -feet of the project area. However, suitable maternity roosting habitat was found to
occur along the bluff adjacent to the auxiliary spillway. For this reason, Mr. Tompkins and Ms.
Cameron made recommendations to Duke Energy for summer acoustic surveys to be conducted,
within the 3 -acre blasting and clearing area of the project, to determine presence/absence of these
species. A survey plan was established and approved by this office and surveys were conducted at
two sites within the project area from May 16 — May 18, 2016. The final report of the findings from
the survey was submitted to this office on June 13, 2016. According to the report, five Indiana Bat
and eight Northern Long -Eared Bat call files were identified. Upon review, Mr. Tompkins informed
Mr. Mularski that the survey results indicated that both species (Indiana Bat and Northern Long -
Eared Bat) were present within the project area. Because the survey results indicated potential
presence, Duke Energy has proposed the following measures to be implemented into the project
plans to avoid impacts to Indiana Bat and Northern Long -Eared Bat:
1. Trees within the 3 -acre blasting and clearing area will be cut during the winter (October 15 -
April 15) to avoid impacts to avoid the maternity roost period for Indiana Bat and Northern Long -
Eared Bat.
2. If any random trees must be cut during the summer roost period, this office will be notified and
an experienced biologist will conduct an on-site habitat assessment to determine if trees are
suitable maternity roost trees. If the tree(s) to be cut are suitable roost trees, an emergence survey
will be conducted before tree removal.
3. All potential suitable roost trees identified adjacent to the project area will be marked and
protected during clearing activities.
We appreciate the proposal to implement the conservation measures to avoid impacts to Indiana Bat
and Northern Long -Eared Bat. However, we believe an additional measure is necessary if
emergence surveys are conducted before the removal of random tree(s) during the summer maternity
roost period. If emergence surveys are conducted, and bats are observed using the tree(s) to be
removed, we recommend that this office be contacted to establish a plan for proceeding before the
tree(s) is removed. If the above stated measures are implemented into the project plans (including
our additional recommendation), we could concur with a "may affect, not likely to adversely affect"
determination for Indiana Bat and Northern Long -Eared Bat; and the consultation requirements under
section 7 of the Act have been fulfilled.
2
D-3

For all other federally listed species known to occur in Jackson County, we concur with the "no
effect" determination issued by Duke Energy and HDR, Inc. Therefore, we believe the requirements
under section 7 of the Act are fulfilled. However, obligations under section 7 of the Act must be
reconsidered if: (1) new information reveals impacts of this identified action that may affect listed
species or critical habitat in a manner not previously considered, (2) this action is subsequently
modified in a manner that was not considered in this review, or (3) a new species is listed or critical
habitat is determined that may be affected by the identified action.
Erosion Control. The PN included a statement that erosion control would be addressed as
established in the Shoreline Management Plan for the project. We are not aware of any specific
information in the Shoreline Management Plan concerning erosion control measures for a reservoir
drawdown of the magnitude necessary for the proposed project. We recommend that Duke Energy
develop a plan to monitor and mitigate for erosion along the exposed reservoir banks. After rain
events, areas near storm water outfall pipes or culverts that release high velocity discharges onto
exposed banks should be inspected for erosive reels or mass wasting. The plan should include
measures that will be implemented should erosive/mass wasting areas be found that are contributing
sediment to the river channel. We recommend the use of straw bales or other devices at problem
sites to decrease velocity of water, decrease erosion, and minimize the amount of sediment released.
Any problem areas should be documented. Information on documented problem areas should be
maintained to focus efforts on erosion control during any future drawdowns.
Reservoir Drawdown. The PN indicated that the water level in the reservoir will be drawn down
about 30 feet for a duration of 14 to 16 months to facilitate construction of the spillway
modifications. The PN did not include a drawdown schedule for the project. To ensure that aquatic
resources within the reservoir are not adversely affected by the drawdown of the reservoir, we
recommend that Duke Energy consult and reach agreement with the USFWS, other natural resource
agencies, and regulatory agencies concerning any reasonable and necessary measures to minimize the
impacts of the drawdown.
We appreciate the opportunity to provide these comments. If we can be of assistance or if you have
any questions, please do not hesitate to contact Mr. Bryan Tompkins of our staff at 828/258-3939,
Ext. 240. In any future correspondence concerning this project, please reference our Log Number
4-2-16-547.
Sincerely,
- - original signed - -
Janet Mizzi
Field Supervisor
E -Copy: Mr. Eric Mularski, HDR, Inc.
Mr. Steve Johnson, Duke Energy Carolinas, LLC
D-4

E23
hdrinc.com
July 28, 2016
Mr. Bryan Tomkins
U.S. Fish and Wildlife Service
Asheville Field Office
160 Zillicoa Street
Asheville, NC 28801
Subject: Duke Energy — Cedar Cliff Development Auxiliary Spillway Upgrade Project
Jackson County, North Carolina
Dear Mr. Tomkins:
HDR, on behalf of Duke Energy Carolinas, LLC (Duke Energy), requests review and
comment on any potential issues with respect to federally listed species due to
construction activities associated with the proposed auxiliary spillway upgrade project at
the Cedar Cliff Development located in Jackson County, North Carolina (Figure 1). These
activities will require a Section 404 of the Clean Water Act (CWA) permit for unavoidable
impacts to jurisdictional waters. A pre -application meeting was held with Duke Energy and
representatives from Jackson County, the U.S. Army Corps of Engineers (USACE), and
the U.S. Fish and Wildlife Service (USFWS) on December 1, 2015, to discuss the
proposed project, associated environmental impacts, and to develop a desired permitting
strategy.
Proposed Project
A letter (dated April 24, 2014) was issued by the Federal Energy Regulatory Commission
(FERC) requiring Duke Energy to satisfy safe passage of the Inflow Design Flood, which is
defined as the Probable Maximum Flood (PMF) without overtopping Cedar Cliff Dam. A
Core Team was assembled consisting of representatives from Duke Energy, FERC, and
HDR to develop remedial alternatives. The preferred remedial alternative developed by the
Core Team to safely pass the PMF involves modifications to the existing auxiliary spillway
channel and main dam toe berm, placement of an 11 -foot -high concrete parapet wall
along the crest of the dam, and installation of Fusegates within the auxiliary spillway
control section.
Proposed Physiography
The Project area is situated in the Blue Ridge Mountain physiographic region and in the
intermediate mountain landtype, with elevations ranging from 3,500 to 4,800 feet
(Figure 2). Most of the Project area is steep and rocky, although a small opening along the
bluffline is utilized for cattle grazing. Forests within the Project area are predominantly
mixed. The canopy is dominated by a combination of tulip tree (Liriodendron tulipifera), red
400 South Church Street Suites 900 & 1000, Charlotte, NC 28202-2075
T 704.338.6700 F 704.338.6760
D-5

Mr. Bryan Tomkins
July 28, 2016
Page 2
maple (Acer rubrum), shortleaf pine (Pinus echinata), and white pine (Pinus strobus).
Additional tree species present in the understory include Virginia pine (Pinus virginiana),
black locust (Robinia pseudoacacia), black gum (Nyssa sylvatica), and red maple.
Protected Species
HDR obtained an updated species list for Jackson County from the USFWS website,
(https://www.fws.gov/raleigh/species/cntylist/mackson.html), which was last updated on July
24, 2015. Table 1 provides a summary of these species.
Table 1. Federally Protected Species for Jackson County, North Carolina.
Common Name
Scientific Name
Federal
Designation'
Record
Status2
Vertebrates
Bog turtle
Clemmys muhlenbergii
T(S/A)
Probable/
Potential
Carolina northern flying
squirrel
Glaucomys sabrinus
coloratus
E
Current
Indiana bat
Myotis sodalis
E
Current
Northern long-eared bat
Myotis septentrionalis
T
Current
Invertebrates
Appalachian elktoe
A/asmidonta raveneliana
E
Current
Spruce -fir moss spider
Microhexura montivaga
E
Current
Vascular Plants
Small whorled pogonia
Isotria medeoloides
T
Current
Swamp pink
Helonias bullata
T
Current
Lichen
Rock gnome lichen
Gymnoderma lineare
E
Current
E = Endangered. A taxon "in danger of extinction throughout all or a significant portion of its range."
T = Threatened. A taxon "likely to become endangered within the foreseeable future throughout all or a significant portion
of its range."
T(S/A) = Threatened due to similarity of appearance. A taxon that is threatened due to similarity of appearance with
another listed species and is listed for protection. Taxa listed as T(S/A) are not biologically endangered or threatened and
are not subject to Section 7 consultation.
Current = The species has been observed in the county within the last 50 years.
Probable/Potential = The species is considered likely to occur in the county based on the proximity of known records
(adjacent counties), the presence of potentially suitable habitat, or both.
HDR conducted an on-site survey in September 2015 to identify potential habitat and
possible individuals of federally protected species listed in Table 1 for Jackson County.
HDR consulted the North Carolina Natural Heritage Program (NCNHP) Element
Occurrence database for protected species distribution and proximity to the project. The
NCNHP database revealed no known occurrences of federally protected species within
the Project area (Figure 3). The following is a summary of biological conclusions for
is

Mr. Bryan Tomkins
July 28, 2016
Page 3
species that are protected under provisions of Section 7 and Section 9 of the Endangered
Species Act of 1973.
The site visit revealed no suitable habitat for the bog turtle (Clemmys muhlenbergii),
Carolina northern flying squirrel (Glaucomys sabrinus coloratus), Appalachian elktoe
(Alasmidonta raveneliana), spruce -fir moss spider (Microhexura montivaga), small -whorled
pogonia (Isotria medeoloides), swamp pink (Helonias bullata), or rock gnome lichen
(Gymnoderma lineare) within the Project area. Potential roosting habitat for the Indiana bat
(Myotis sodalis) and northern long-eared bat (Myotis septentrionalis) was identified along
the rock face of the auxiliary spillway and trees along the top of the ridge.
A database search conducted by the USFWS indicated no known northern long-eared bat
occupied hibernacula and maternity roost trees are located within close proximity of the
Project area. During a site visit conducted by USFWS, Duke Energy, and HDR
representatives on March 23, 2016, the USFWS determined that there is suitable habitat
for federally protected bat species along the bluff of the existing auxiliary spillway. USFWS
recommended a summer acoustic survey to be conducted to determine the presence
and/or absence of Indiana bat and northern long-eared bat within an approximate 3 -acre
proposed blasting and clearing area required for the auxiliary spillway modifications.
A Study Plan following the 2016 Rangewide Indiana Bat Summer Survey Guidelines was
developed and submitted to USFWS for approval on April 25, 2016. A bat acoustic survey
was conducted during the summer survey window (May 16 to May 18) at two locations for
two nights each to determine the presence and/or probable absence of Indiana bats and
northern long-eared bats within the proposed blasting and clearing area (Figure 4 and
attached photographs). Bat calls were analyzed using two software programs approved by
the USFWS: BCID and EchoClass. Ten bat species were initially identified by the acoustic
analysis programs. A total of five Indiana bat and eight northern long-eared bat call files
were identified. No consensus identification was reached by the two programs for either
species. A report detailing the findings of the bat acoustic survey was submitted
electronically to the USFWS on June 13, 2016. After reviewing the report, USFWS issued
a response stating they assume federally protected bat species are present in the Project
area.
Minimization Measures
Duke Energy proposes to cut trees within the 3 -acre blasting and clearing area during the
winter (October 15—April 15) to minimize impacts to federally protected bat species. The
USFWS will be notified if random trees need to be removed during the summer maternity
roost season. An experienced biologist will conduct an onsite habitat assessment to
determine if species to be cleared contain potential roosts (i.e., live trees and/or snags that
have exfoliating bark, cracks, or crevices). If potential roosts are identified, emergence
surveys will be conducted at nighttime, before trees/snags are to be removed. All potential
D-7

Mr. Bryan Tomkins
July 28, 2016
Page 4
roost trees identified adjacent to the proposed clearing area will be marked and protected
during clearing activities.
On behalf of Duke Energy, we request that the USFWS issue a "may affect, but not likely
to adversely affect" determination for protected bat species based on the above
minimization measures. Also, please confirm that no further consultation is required for the
proposed Project.
Thank you in advance for your assistance. If you have any questions or require additional
information after your review of the enclosed information, please contact me at (704) 973-
6878 or eric.mularskiBhdrinc.com.
Respectfully,
HDR Engineering, Inc. of the Carolinas
1,
Eric Mularski, PWS
Senior Environmental Scientist
Attachments: Figure 1. Project Location
Figure 2. USGS Quadrangles
Figure 3. NCNHP Element Occurrence Database
Figure 4. Bat Acoustic Monitoring Locations
Site Photographs
cc: Jon Wise — Duke Energy
John Eddy — Duke Energy
Tim Banta — HDR
IN

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D-9

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D-10

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D-11

LEGEND
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D-12

Duke Energy — Cedar Cliff Development Auxiliary Spillway Upgrade Project
Photograph 1 — Cedar Cliff Dam
Photograph 2 — Main Spillway and East Fork Bypassed Reach
D-13

)-7Z
Duke Energy — Cedar Cliff Development Auxiliary Spillway Upgrade Project
Photograph 3 — Cedar Cliff Lake
Photograph 4 — Auxiliary Spillway and Proposed Blasting Area
D-14

Environmental Report OR
Cliff Auxiliary Spillway Upgrade
May 2019 1 E-1

Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Hydroelectric Development Auxiliary Spillway Upgrade Project
Cedar Cliff Lake Drawdown Plan (2019 Update)
1.0 INTRODUCTION
The East Fork Hydroelectric Project (Project) is owned and operated by Duke Energy Carolinas, LLC
(Duke Energy) under a license issued by the Federal Energy Regulatory Commission (FERC) on
May 4, 2011.' The Project consists of three hydroelectric developments which include, from
upstream to downstream, Tennessee Creek (includes the Wolf Creek Dam and the Tanasee Creek
Dam), Bear Creek, and Cedar Cliff. The Cedar Cliff Development includes Cedar Cliff Dam located
on the East Fork of the Tuckasegee River near river mile (RM) 52.1 in Jackson County, North
Carolina. The FERC Project boundary for the East Fork Project encompasses approximately 1,462
acres, including 23.15 acres of the Nantahala National Forest administered by the U.S. Forest
Service (USFS) adjacent to the Bear Creek and Tennessee Creek Developments.
Via letter dated April 24, 2014, the FERC Atlanta Regional Office (ARO) required Duke Energy to
satisfy safe passage of the Inflow Design Flood (IDF), which is defined as the Probable Maximum
Flood (PMF), without overtopping Cedar Cliff Dam. The proposed remedial alternative to safely pass
the PMF involves modifications to the existing auxiliary spillway channel, installation of a Fusegate
system within the auxiliary spillway control section, placement of an 8.5 -foot (ft) -high concrete
parapet wall along the crest of the dam, and other appurtenant components. Related activities will
include the new redundant hoist installation at the principal spillway, Tainter gate maintenance,
powerhouse transformer replacement, new access road construction and modifications to an
existing private access road, construction of a new principal spillway bridge, and construction of an
approximately 0.5 -acre laydown area at the upstream approach channel to the auxiliary spillway.
In order to complete the aforementioned work, Cedar Cliff Lake will need to be drawn down
approximately 30 feet from Full Pond Elevation (Attachment 1) for the duration of construction
(anticipated to be approximately 25 months). In accordance with the Hydro Project Maintenance &
Emergency Protocol (HPMEP) for the Project (Appendix A of the license order), Duke Energy has
prepared this Drawdown Plan to describe the procedures and schedule associated with the Cedar
Cliff Lake drawdown and measures to maintain compliance with the state water quality certification,
FERC license and associated plans, and the Tuckasegee Cooperative Stakeholder Team
Settlement Agreement, as applicable. Under a separate cover letter, Duke Energy has consulted
Duke Energy Carolinas, LLC, 143 FERC 162,203 (2013).
E-2

Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Development Auxiliary Spillway Upgrade Project
Cedar Cliff Lake Drawdown Plan (2019 Update)
with the North Carolina State Historic Preservation Office (NCSHPO) and the Eastern Band of
Cherokee Indians Tribal Historic Preservation Officer (EBCI THPO) regarding measures to be taken
for extended drawdowns (Attachment 2).
Duke Energy is submitting this Drawdown Plan to FERC for approval as part of a request for a
temporary variance of the reservoir elevation requirements for the Cedar Cliff Development,
pursuant to Article 401 of the Project license. As explained below in Section 4.1, this approval is
being requested by Duke Energy because the proposed drawdown is outside of the typical
maintenance activities or circumstances established by the Low Inflow Protocol and the Hydro
Project Maintenance & Emergency Protocol.
2.0 PROJECT DESCRIPTION
The Cedar Cliff Development consists of a 590 -foot -long, 173 -foot -wide, earth -and -rock fill dam with
a crest elevation of 2,343.5 feet above mean sea level (ft AMSL). The dam impounds Cedar Cliff
Lake with a surface area of 121 acres and approximately five miles of shoreline at Full Pond
Elevation 2,330 ft AMSL. A principal spillway with one Tainter gate is located at the right abutment of
the dam. An auxiliary spillway with two erodible fuse plug sections is located at the left abutment of
the dam. Water is conveyed to the Cedar Cliff powerhouses via a tunnel intake opening near the
right upstream toe of the dam and travels down the 1,138 -foot -long power tunnel and penstock. The
main powerhouse contains one vertical Francis -type generating unit with an installed capacity of
8,187 horsepower (hp) and a hydraulic capacity of 555 cubic feet per second (cfs). In 2012, Duke
Energy installed a new minimum flow unit, which is housed in a new small powerhouse adjacent to
the main powerhouse and has nameplate -rated capacity of 526 hp and a hydraulic capacity of 35
cfs. Cedar Cliff Dam creates a 0.46 -mile -long Bypassed Reach from the base of the dam to the
Cedar Cliff powerhouse discharge and back to the East Fork Tuckasegee River. No continuous
minimum flow from the reservoir is provided to the Bypassed Reach.
Operation of the upstream Tennessee Creek and Bear Creek Developments is coordinated with the
operation of the Cedar Cliff Development. The Tennessee Creek and Bear Creek powerhouses
typically operate during the afternoon to support system loads and to refill Cedar Cliff Lake for off-
peak generation and water releases. Water from Tanasee Creek Lake and Wolf Creek Lake is
released downstream into Bear Creek Lake. Water is released from the Bear Creek Powerhouse to
Cedar Cliff Lake. Cedar Cliff Lake is normally operated between elevations 2,330 ft AMSL and 2,326
ft AMSL year-round, with a normal target elevation of 2,328 ft AMSL.
E-3

Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Development Auxiliary Spillway Upgrade Project
Cedar Cliff Lake Drawdown Plan (2019 Update)
The FERC Project boundary around Cedar Cliff Lake encompasses the dam and reservoir, the
Project structures, the Bypassed Reach, and two formal public recreation sites, the Cedar Cliff
Access Area, located on Cedar Cliff Lake, and the Shook Cove Access Area, located downstream of
the powerhouses. Operation and maintenance of both sites are provided by the North Carolina
Wildlife Resources Commission (NCWRC). No federal lands are included in the FERC Project
boundary for the Cedar Cliff Development.
3.0 DRAWDOWN PLAN
3.1 Drawdown and Refill Rate
Cedar Cliff Lake will be drawn down to approximately 2,300 ft AMSL (30 ft below Full Pond Elevation
2,330 ft AMSL) to allow for the new redundant hoist instal lation/Tainter gate maintenance and
construction of the auxiliary spillway upgrade. Cedar Cliff Lake elevation will be lowered by releasing
flows through the generating units at a rate no greater than three feet per 24 hours (average of 0.13
ft per hour) on a continuous basis until the desired lake elevation is achieved. During the reservoir
drawdown process, Duke Energy will perform inspections of the exposed shoreline areas for the
occurrence of erosion or fish standing in shallow lake areas. If erosion or fish stranding is observed,
Duke Energy will consult with the resource agencies to determine if a decreased drawdown rate is
necessary to reduce the likelihood of the erosion or stranding to occur.
Cedar Cliff Lake will be held at approximately 2,300 ft AMSL for the duration of construction activities
by releasing flows through the generating units or over the principal spillway. In the event of Cedar
Cliff Development inflow exceeding approximately 590 cfs or the available powerhouse capacity,
inflow will be passed over the sill of the principal spillway (elevation 2,305 ft AMSL), as the Tainter
gate will remain in a partially open condition throughout construction .
Upon completion of construction activities, Cedar Cliff Lake will be refilled based on inflows, but at a
rate no greater than three feet per 24 hours (average of 0.13 ft per hour) on a continuous basis until
the Normal Target Elevation (i.e., 2,328.0 ft AMSL) is achieved.
3.2 Schedule
Duke Energy anticipates the duration of construction activities at the Cedar Cliff Development will be
approximately 25 months, with construction planned for September 2019 through September 2021.
To facilitate the start of construction in early September 2019 (post Labor Day weekend), the Cedar
Cliff Lake drawdown will begin on September 3, 2019, and the refill will begin in October 2021.
E-4

Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Development Auxiliary Spillway Upgrade Project
Cedar Cliff Lake Drawdown Plan (2019 Update)
3.3 Public Outreach
Based on the duration and extent of the Cedar Cliff Lake drawdown, Duke Energy will perform public
outreach measures to notify land owners abutting Cedar Cliff Lake and primary lake users of the
planned drawdown. Duke Energy public outreach will include the following:
■ Provide information related to the schedule and associated impacts of the Cedar Cliff
Lake drawdown on the existing Duke Energy Lakes & Recreation website and telephone
system;
■ Post a sign(s) at the Cedar Cliff Lake Access Area notifying users of the schedule of the
drawdown and associated impacts and restrictions;
■ Provide written notification of the drawdown to land owners abutting the Cedar Cliff Lake
including information for an appropriate contact at Duke Energy to report concerns;
■ Provide written notification of the drawdown to primary lake users such as local
recreation outfitters;
■ Coordinate with the NCWRC pursuant to the existing agreement between Duke Energy
and the NCWRC;
■ Assist the NCWRC with external communications regarding any NCWRC activities or
schedules for 2019 through 2021 that will be impacted by the drawdowns; and
■ Provide press releases in local news outlets.
In addition to the measures listed above, Duke Energy provided preliminary notification of the planned
drawdown to affected homeowners and via local news outlets in the fall of 2018.
3.4 Sediment and Erosion Control
Sediment and erosion control measures will be implemented and maintained, as necessary, per the
requirements of the state water quality certification and to maintain compliance with the state water
quality standards, statutes, or rules.
During drawdown and immediately after the drawdown elevation is reached at each facility,
inspections will be performed by Duke Energy once per week and after significant rainfall events
(e.g., precipitation estimates for the Project area of 1 inch or greater within 24 hours), as feasible.
Approximately one month after the drawdown is reached and based on the condition of the exposed
lake bottom, inspections will occur at least monthly for the duration of the drawdown. Inspections will
identify mass wasting and sloughing on the banks and remediation measures will be installed as
needed. Remedial measures may include installation of straw bales along the banks or similar
E-5

Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Development Auxiliary Spillway Upgrade Project
Cedar Cliff Lake Drawdown Plan (2019 Update)
measures to decrease velocity of waters, decrease erosion, and minimize the amount of sediment
released to Cedar Cliff Lake through erosion. Erosion control materials (i.e., straw bales) will be
available onsite in the event such materials need to be rapidly deployed via barge.
4.0 LICENSE COMPLIANCE
4.1 Article 401 — Reservoir Level Management
License Article 401 requires Duke Energy to operate the Project according to specific reservoir level
management provisions, as required by Condition 6 of the North Carolina water quality certification
to protect the aquatic and recreational resources in the Tuckasegee River and to provide required
downstream flows. More specifically, the Licensee is required to maintain the elevation of the Project
reservoirs between the designated Normal Minimum and Normal Maximum elevations (2,326 ft
AMSL and 2,330 ft AMSL, respectively), except when the Licensee is permitted to vary from the
Normal Operating Range as established in the Low Inflow Protocol (as outlined in Appendix A of the
license order) and in the HPMEP (also included in Appendix A of the license order).
The reservoir level requirements may be temporarily modified from the Normal Operating Range if
required by conditions beyond the control of the Licensee, for short periods during annual inspection
and repair events, or by operating emergencies or maintenance needs as defined in the Low Inflow
Protocol and the HPMEP. If operations or reservoir levels are so modified, the Licensee shall notify
the FERC as soon as possible, but no later than 10 days after each such incident, and shall provide
the reason for the change in reservoir levels.
Consistent with the consultation requirement of the HPMEP, Duke Energy has prepared this Cedar
Cliff Lake Drawdown Plan in consultation with the NCWRC, the United States Fish and Wildlife
Service (USFWS), and the North Carolina Division of Water Resources (NCDWR). An early draft of
the Drawdown Plan was distributed for review in December 2016. The Drawdown Plan has been
revised to incorporate comments received from this review, as well as applicable comments received
during the 2017-2018 consultation process for the East Fork Project Comprehensive Drawdown Plan
for Required Maintenance Activities in 2018-2019. Updated versions of this Drawdown Plan were
re -distributed to the NCWRC, USFWS, and NCDWR for review and concurrence in August 2018 and
May 2019, prior to being submitted to the FERC with the original and updated requests for approval
of a temporary variance of the reservoir elevation requirements for the Cedar Cliff Development.
E-6

Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Development Auxiliary Spillway Upgrade Project
Cedar Cliff Lake Drawdown Plan (2019 Update)
4.2 Article 402 — Recreation Plan
Under License Article 402, Duke Energy has prepared and maintains a Recreation Plan for the
Project, which was approved by FERC by order dated November 27, 2012. As described in the
Recreation Plan, with respect to the Cedar Cliff Development, a single formal recreation access area
is maintained by Duke Energy in partnership with NCWRC at Cedar Cliff Lake, the Cedar Cliff
Access Area. As stated above and in the Recreation Plan, the Cedar Cliff Development includes one
recreation area, the Cedar Cliff Lake Access Area that provides a boat ramp, pier, seasonal portable
toilet, and parking. Duke Energy does not currently charge a fee for public use of the access area
facilities, which are open for use at all times. The Cedar Cliff Lake Access Area is currently
maintained through a cooperative maintenance agreement with NCWRC.
The boat ramp at the Cedar Cliff Access Area will be unusable during the drawdown. The 30 -foot
drawdown described in this plan will result in closure of the Cedar Cliff Access Area when Cedar Cliff
Lake reaches elevation 2,323 ft AMSL. The site will remain closed until Cedar Cliff Lake returns to
elevation 2,323 ft AMSL or greater. Pursuant to the requirements of the FERC -approved Recreation
Plan and associated agreement with the NCWRC, Duke Energy will coordinate with the NCWRC for
methods for closure of the Cedar Cliff Lake Access Area and public notification during the drawdown
period. As mitigation for the approximately 25 -month closure of this facility, NCWRC requested that
Duke Energy use this opportunity to perform additional maintenance at the site, including paving and
limited removal of accumulated sediment under dewatered/dry conditions. Flow from Kiesee Creek
has eroded the existing floating boat dock and sediment has been deposited in the shallow portion of
the reservoir. Duke Energy plans to excavate the excess sediment from the reservoir to elevation
2,322 ft msl, with all excavated material to be deposited in upland areas. Installation of a permanent
rock vane is proposed to deflect flow from Kiesee Creek away from the boat launch.
4.3 Article 403 — Public Information at East Fork Project
In accordance with the requirements of License Article 403, Duke Energy will continue to provide
information on its website and telephone system regarding reservoir levels and recreation flows for
Bear Creek, Cedar Cliff, Wolf Creek, and Tanasee Creek Lakes.
E-7

Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Development Auxiliary Spillway Upgrade Project
Cedar Cliff Lake Drawdown Plan (2019 Update)
4.4 Article 404 — Minimum Flow
License Article 404 (as amended)z requires the licensee to release minimum flow from the Cedar
Cliff reservoir to the East Fork of the Tuckasegee River, as required by Condition 6 of the North
Carolina water quality certification, which consists of 1) during non -generation hours, a flow of 10 cfs
from December 1 through June 30, and 35 cfs from July 1 through November 30, or 2) during low
inflow periods3, a flow of 6 cfs from December 1 through June 30, and 11 cfs from July 1 through
November 30. Duke Energy expects to continue to provide the required minimum flow from the
Cedar Cliff Development throughout the duration of the drawdown.
In the event the required minimum flows cannot be provided during the drawdown period due to low
inflow, Duke Energy will provide written notification pursuant to the FERC -approved Minimum Flow
and Flow Monitoring Plan and Low Inflow Protocol.
4.5 Article 405 — Recreation Flow
License Article 405 requires the Licensee to operate the East Fork Project to provide scheduled
recreation flow releases at or above the best efficiency flow of the Cedar Cliff unit into the main stem
of the Tuckasegee River during the recreation season. Throughout the duration of the drawdowns
described herein, Duke Energy will continue to provide recreation flows required by Article 405.
4.6 Article 414 — Programmatic Agreement
License Article 414 requires the licensee to implement the "Final Programmatic Agreement Among
the Federal Energy Regulatory Commission and the North Carolina State Historic Preservation
Officer for Managing Historic Properties that may be Affected by a License Issuing to Duke Power
Company, LLC for the Continued Operation and Maintenance of the East Fork Hydroelectric Project
in Jackson County, North Carolina," executed on September 19, 2006, and including but not limited
to the approved Historic Properties Management Plan (HPMP), filed August 7, 2006, for the Project.
The 2006 HPMP includes special provisions associated with large, planned, extended drawdowns,
which is defined as any planned drawdown where the pond elevation will remain at least 10 feet
below the Normal Minimum Elevation for a minimum of 30 consecutive days. Specifically, the
provision states that in the event of a large, planned, extended drawdown, the Licensee will consult
with the North Carolina State Historic Preservation Office (NCSHPO) and the Eastern Band of
2 Duke Energy Carolinas, LLC, 138 FERC 162,146
3 As defined by the Low Inflow Protocol (Appendix A of the license order)
E-8

Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Development Auxiliary Spillway Upgrade Project
Cedar Cliff Lake Drawdown Plan (2019 Update)
Cherokee Indians (EBCI) Tribal Historic Preservation Office (THPO) regarding the need to conduct
archaeological surveys of the exposed area
Pursuant to the requirements of the 2006 HPMP, Duke Energy sent a letter dated August 5, 2016 to
the NCSHPO and EBCI THPO providing notification and description of the planned construction
activities and associated drawdown at the Cedar Cliff Development. No response was received by
Duke Energy from the EBCI THPO. Via letter dated August 30, 2016, the NCSHPO indicated it is
unlikely that any archaeological resources that may be eligible for inclusion in the National Register
of Historic Places will be adversely affected by the planned construction activities and drawdown.
The NCSHPO requested that Duke Energy take photographs to document the current condition of
the dam and its surroundings pursuant to their guidelines. Duke Energy is in the process of
completing the photographic documentation of the Cedar Cliff Dam and its surroundings pursuant to
the NCSHPO's request and guidelines. Copies of the above -referenced letters are provided in
Attachment 2.
Duke Energy also distributed a copy of the East Fork Project Comprehensive Drawdown Plan for
Required Maintenance Activities in 2018-2019 (including a 10 -foot drawdown of Cedar Cliff Lake) to
the NCSHPO and EBCI THPO, to provide notification and description of the planned activities and
associated drawdowns at the Bear Creek, Cedar Cliff, and Tennessee Creek Developments and
initiate consultation regarding the need to conduct archaeological surveys of the exposed area. By
letter to Duke Energy dated October 23, 2017, NCSHPO stated that they had conducted a review of
the Project and are aware of no historic resources that would be affected, and therefore NCSHPO
has no comments on the proposed activities. No response was received from EBCI THPO, so,
consistent with Chapter 4 of the 2006 HPMP, Duke Energy therefore assumed concurrence with
Duke Energy's determination of no effect and that no additional surveys are required.
5.0 CONSULTATION
On December 15, 2016, Duke Energy provided a draft of this Drawdown Plan for 30 -day review to
NCDWR, NCWRC, and USFWS, all of which provided comments on the draft plan. Duke Energy
incorporated the comments received into this Drawdown Plan, as applicable. A summary of the
comments received and how they were addressed as well as the record of consultation is provided
in Attachment 3.
Duke Energy provided an updated draft version of this Drawdown Plan to the aforementioned parties
for 30 -day review in August 2018 (no additional comments were received) and May 2019.
E-9

Attachment 1
Cedar Cliff Development
Drawdown Reservoir Water Surface Map
E-10

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E-11

Attachment 2
SHPO and THPO Consultation Pursuant to License Article 414
E-12

North Carolina Department of Natural and Cultural Resources
State Historic Preservation Office
Ramona M. Bartos, Administrator
Governor Pat McCrory
Secretary Susan Kluttz
August 30, 2016
Office of Archives and History
Deputy Secretary Kevin Cherry
Christy Churchill Christy. Churchillgduke-energy. com
Duke Energy
550 South Tryon Street
Charlotte, NC 28202
Re: Cedar Cliff Development Auxiliary Spillway Upgrade Project, East Fork Hydroelectric Project,
FERC 2698-033, Jackson County, ER 16-1388
Dear Ms. Churchill:
Thank you for your letter of August 5, 2016, regarding the above -referenced undertaking. We have
reviewed the materials submitted and offer the following comments.
Based on our knowledge of the area, it is unlikely that any archaeological resources that may be eligible for
inclusion in the National Register of Historic Places will be adversely affected by the project.
The East Fork Hydroelectric Project is eligible for listing in the National Register of Historic Places
(NRHP) under Criterion A for "Engineering." However, when the East Fork Hydroelectric Project was
evaluated in 2014, the Cedar Cliff Development (JK0729), was determined to be a non-contributing
element of the historic property. Therefore, proposed improvements to the Cedar Cliff Development dam
will not diminish the integrity for which the East Fork Hydroelectric Project is considered to be historic.
Before improvements to the dam at Cedar Cliff are initiated, we request photographs thoroughly
documenting the current condition of the dam and its surroundings. Please refer to our guidelines for labeling
and submitting digital images at hqp://www.hpo.ncdcr. og v/digital/NCHPO_Digital_Photo_Policy.html.
The above comments are made pursuant to Section 106 of the National Historic Preservation Act and the
Advisory Council on Historic Preservation's Regulations for Compliance with Section 106 codified at 36
CFR Part 800.
Location: 109 East Jones Street, Raleigh NC 27601 Mailing Address: 4617 Mail Service Center, Raleigh NC 27699-4617 Telephone/Fax: [phone]-6599
E-13

Thank you for your cooperation and consideration. If you have questions concerning the above comment,
contact Renee Gledhill -Earley, environmental review coordinator, at 919-807-6579 or
environmental.review(abncdcr.gov. In all future communication concerning this project, please cite the
above referenced tracking number.
Sincerely,
6WRamona M. Bartos
cc: John Eddy, John.Eddy(a,duke-energy.com
Jon Wise, Jon.Wisegduke-energy com
Tim Banta, Tim.Bantaandrinc.com
David Brown, ACOE
E-14

DUCE
ENERGY_
August 3, 2016
Ms. Renee Gledhill -Earley
State Historic Preservation Officer
North Carolina State Historic Preservation Office
4617 Mail Service Center
Raleigh, NC 27699-4617
Mr. Russell Townsend
Tribal Historic Preservation Officer
Eastern Band of Cherokee Indians
P.O. Box 455
Cherokee, NC 28719
Duke Energy
550 South Tryon Street
Charlotte, NC 28202
Mailing Address:
Mail Code EC13K/ P.O. Box 1006
Charlotte, NC 28201-1006
SUBJECT: East Fork Hydroelectric Project No. 2698-033, Jackson County, North Carolina
Cedar Cliff Development Auxiliary Spillway Upgrade Project
Dear Ms. Gledhill -Earley and Mr. Townsend:
Duke Energy Carolinas, LLC (Duke Energy) is the Licensee of the East Fork Hydroelectric Project
No. 2698-033 (Project). As specified in Article 414 of the Federal Energy Regulatory Commission
(FERC) operating license for the Project, Duke Energy is required to consult with the North
Carolina State Historic Preservation Office (NC SHPO) and the Eastern Band of Cherokee Indians
Tribal Historic Preservation Office (EBCI THPO) regarding activities and undertakings within the
Project Area of Potential Effect (APE) that are not categorically excluded in the Project's Historic
Properties Management Plan (HPMP).
Background
A letter (dated April 24, 2014) issued by the FERC placed Duke Energy on notice to satisfy safe
passage of the Inflow Design Flood (IDF) that is defined as the Probable Maximum Flood (PMF)
without overtopping the Cedar Cliff Dam. Duke Energy proposes to perform upgrades to the
existing auxiliary spillway and main dam toe berm as a remedial alternative to safely pass the PMF
at the Cedar Cliff Development. The proposed undertaking will require federal approval through the
FERC and a Section 404 permit from the U.S. Army Corps of Engineers (USACE). Remediation
measures to the existing dam and auxiliary spillway are categorically excluded activities in the
HPMP, but the reservoir drawdown required to facilitate construction will initiate Section 106
consultation under 36 CFR 800.(3) of the National Historic Preservation Act.
Project Description and History
The Project began commercial operation in 1952 and is currently owned and operated by Duke
Energy. The Project consists of three developments, which are (from upstream to downstream) the
Tennessee Creek Development, Bear Creek Development, and Cedar Cliff Development. The
FERC issued a new license for the Project on May 4, 2011. The Project is currently classified by
the FERC as having "High" hazard potential based on the probable loss of human life and potential
for economical losses, environmental damage, and/or disruption to lifelines caused by failure or
E-15

Ms. Renee Gledhill -Earley East Fork Hydroelectric Project No. 2698-033, Jackson County, North Carolina
Mr. Russell Townsend Cedar Cliff Development Auxiliary Spillway Upgrade Project
August 3, 2016
mis-operation of a dam or appurtenances. The Cedar Cliff Development includes an earth and rock
fill dam, 15 -foot -diameter tunnel, and powerhouse located on the East Fork of the Tuckasegee
River in Jackson County, North Carolina, approximately 6 miles southeast of the town of
Cullowhee (Figure 1).
The Project area is situated in the Blue Ridge physiographic province, a mountainous zone that
extends northeast -southwest from southern Pennsylvania to central Alabama. The physiography of
Jackson County consists of high, intermediate, and low mountains; floodplains; and low stream
terraces (Figure 2). The East Fork Project is located in the Tuckasegee River watershed, which
typically drains to the north. The Project area is surrounded by open water, rural residential,
pastureland, and forested undeveloped lands (see attached site photographs).
Proposed Project
A Core Team was assembled consisting of representatives from Duke Energy, FERC, and HDR to
develop remedial alternatives for safely passing the PMF at the Cedar Cliff Development. The
preferred alternative developed by the Core Team involves modifications to the existing auxiliary
spillway channel and main dam toe berm, placement of an 11 -foot -high concrete parapet wall
along the crest of the dam, and installation of Fusegates within the auxiliary spillway control
section. Rock spoil from the auxiliary spillway excavation will be loaded onto a barge and
deposited in Cedar Cliff Lake to eliminate potential impacts to environmental resources at
alternative rock spoil locations. This activity will result in approximately 316,600 cubic yards of
permanent fill within an approximate 9.6 -acre footprint of the reservoir.
As part of the proposed upgrade project, Cedar Cliff Lake will be drawn down approximately 30
feet (Elevation 2,330 feet mean sea level) for a duration of 14 to 16 months to facilitate
construction of the spillway modifications (Figure 3). The drawdown footprint and excavation area
north of the existing auxiliary spillway will serve as the APE not categorically excluded by the
proposed remediation activities. The HPMP specifies that Duke Energy will consult with the NC
SHPO and the EBCI THPO in the event of a large, planned extended drawdown to determine if an
archaeological survey of the exposed area should be conducted. Duke Energy requests your
comments and opinions on whether an archaeological survey of the exposed area should be
conducted.
We also request that you review the attached information and verify that no additional cultural
resources surveys are required for the proposed upgrade project under Section 106 of the National
Historic Preservation Act. Should you have any questions regarding this project or require
additional information, please do not hesitate to contact Christy Churchill at [phone] or
Christv.Churchilladuke-eneray.com.
Sincerely,
Duke Energy Carolinas, LLC
Christy Churchill
Cultural/Historical Resources Coordinator
Attachments: Figure 1. Project Location
Figure 2. USGS Quadrangles
Figure 3. Aerials
Site Photographs
cc: Jon Wise — Duke Energy
John Eddy — Duke Energy
21
E-16

a
LEGEND- - - d
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Tom Tom, Intermap, USGS, FAO, NPS, 1
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E-17

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AERIALS
FIGURE 3
SECTION 106 CONSULTATION
E-19

Duke Energy — Cedar Cliff Auxiliary Spillway Upgrade Project
Photograph 3 — Auxiliary Spillway and Proposed Blasting Area
Photograph 4 — Cedar Cliff Auxiliary Spillway and Fuse Plugs
E-21

IC

Attachment 3
Agency Consultation Pursuant to License Article 401
E-23

Cedar Cliff Drawdown Plan Comments/Responses
Date
Form
Name
Organization
Comment
Response
1. The periodicity of shoreline inspection of at least once per month should be
During the drawdown and immediately after the drawdown is reached, inspections will be
shorter during and immediately after reaching the -30 ft target when the lake
performed once per week and after significant rainfall events (e.g., forecasts of 0.5 inches
bottom is saturated and more susceptible to erosion. During this early phase
or greater within 24 hrs). Approximately one month after the drawdown is reached and
January 18, 2017
Email
Fred R Tarver III
NCDWR
inspections should follow rain events. The time between inspections could be
based on the condition of the exposed lake bottom, inspections will occur at least monthly
lengthened as the exposed lake bottom hardens and the weather patterns, and the
for the duration of the drawdown. Inspections will look to identify mass wasting and
associated drought, change.
sloughing of the banks.
January 18, 2017
Email
Fred R Tarver III
NCDWR
2. Duke Energy should be responsive to the observations and concerns of the
Duke Energy will provide contact information to communicate concerns from the property
adjacent land owners regarding erosion and water quality.
owners.
1. Duke Energy is proposing to lower the lake level at a rate of about 3 -feet per day
Duke Energy notes this comment and acknowledges that the drawdown will not exceed a
until the desired lake level is achieved. We generally recommend a drawdown rate
rate of 3 feet per 24 hours.
January 9, 2017
Letter
Janet Mizzi
USFWS
of between one and three feet per day. Although the three feet per day drawdown
is at the upper end of our recommended range, we do not object to the proposal
submitted by Duke Energy.
2. Throughout the drawdown process we recommend that consistent monitoring be
Duke Energy will not perform the drawdown during fish spawning season. Duke Energy
conducted for erosion of exposed shoreline areas and for the occurrence of fish
will utlize existing lake bottom topography maps of to identify areas that may be
stranding in shallow lake areas. If shoreline erosion/destabilization or fish
susceptible for fish stranding (i.e., low gradient shoreline). Duke Energy will perform
January 9, 2017
Letter
Janet Mizzi
USFWS
stranding occurs, we recommend that the instances be documented and submitted
inspections of areas identified during the lake bottom topography evaluation for evidence
to the resource agencies for review. The drawdown rate may need to be decreased
of fish stranding during the drawdown process. Duke Energy will provide documentation
to reduce the likelihood of these impacts from continuing to occur.
to the resource agencies of the inspection findings and consult with the agencies as
necessary to determine if changes to the drawdown rate is required.
3. Additionally, we recommend that the following measures be implemented to
January 9, 2017
Letter
Janet Mizzi
USFWS
further minimize the effects of the proposed project on fish and wildlife resources:
Page 1 of 3
E-24

Date
Form
Name
Organization
Comment
Response
3a. Develop a plan to monitor and mitigate for erosion along the exposed
Section 3.2 of drawdown plan references Erosion and Sediment Control Plan and
reservoir banks. After rain events, areas near storm water outfall pipes or
describes monitoring to be performed, as follows:
culverts that release high velocity discharges onto exposed banks should be
'Duke Energy has developed and will implement an Erosion and Sediment Control Plan to
inspected for erosive reels or mass wasting. The plan should include
prevent sedimentation impacts to water resources. Best Management Practices (BMP) in
measures that will be implemented should erosive/mass wasting areas be
the vicinity of construction activities will include, but not be limited to, installing
found that are contributing sediment to the river channel. We recommend
protective silt fence, restricting the use of wet concrete within surface waters, and
the use of straw bales or other devices at problem sites to decrease velocity
implementing and maintaining a spill prevention plan for heavy equipment. The work area
of water, decrease erosion, and minimize the amount of sediment released.
will be inspected daily for signs of erosion or degradation and device failure. Following
Any problem areas should be documented. Information on documented
construction, all disturbed areas will be restored and re -graded to preconstruction grades
problem areas should be maintained to focus efforts on erosion control
and re -vegetated with native vegetation.
during any future drawdowns.
During the drawdown and immediately after the drawdown is reached, inspections will be
January 9, 2017
Letter
Janet Mizzi
USFWS
performed once per week and after significant rainfall events (e.g., forecasts for the
Project area of 0.5 inches or greater within 24 hours). Approximately one month after the
drawdown is reached and based on the condition of the exposed lake bottom, inspections
will occur at least monthly for the duration of the drawdown. Inspections will look to
identify mass wasting and sloughing on the banks and install remediation measures as
needed. Remedial measures may include use of straw bales or similar to decrease velocity
of waters, decrease erosion, and minimize the amount of sediment released to Cedar Cliff
Lake.
Sediment and erosion control measures will be implemented and maintained, as necessary
per the requirements of the state water quality certification and to maintain compliance
with the state water quality standards, statutes, or rules."
3b. Establish a specific plan to have a qualified biologist identify and
Section 3.1 of drawdown plan now includes the following provision:
enumerate stranded fish during the upcoming drawdown. Duke Energy
'During the reservoir drawdown process, Duke Energy will perform inspections of the
should assess the data, and consult with resource agencies to determine if
exposed shoreline areas for the occurrence of erosion or fish standing in shallow lake
fish populations are being distressed by the drawdown. If it is determined
areas. If erosion or fish stranding is observed, Duke Energy will consult with the resource
January 9, 2017
Letter
Janet Mizzi
USFWS
that fish are being stranded at levels that will impact fishery populations, we
agencies to determine if a decreased drawdown rate is necessary to reduce the likelihood
recommend that Duke Energy arrange for additional stocking of fish (based
of the erosion or stranding to occur."
on the number and species of stranded fish observed during the drawdown)
following the return of the reservoir to normal operating levels.
3c. Mitigate for the loss of recreational fishing at Cedar Cliff Lake by
NCWRC requested enhancements to the Access Area rather than the fish attractors.
providing financial support to North Carolina Wildlife Resources
January 9, 2017
Letter
Janet Mizzi
USFWS
Commission to install fish habitat/attractors within the reservoir during the
drawdown.
3d. Develop a Spill Prevention, Control, and Countermeasure (SPCC) Plan
The contractor(s) retained for the auxiliary spillway upgrade project will develop,
January 9, 2017
Letter
Janet Mizzi
USFWS
to describe measures to prevent, contain, and clean up petroleum spills from
maintain, and implement SPCC Plan(s), as necessary during construction.
construction activities associated with the auxiliary spillway upgrade.
Page 2 of 3
E-25

Date
Form
Name
Organization
Comment
Response
4. According to our records and a review of the information presented, we do not
Duke Energy will implement the protective measures identified by USFWS prior to and
believe that federally listed species or their habitats will be impacted by the
during the auxiliary spillway upgrade project.
proposed drawdown of Cedar Cliff Lake. Due to potential impacts to Northern
Long -Eared Bat (Myotis septentrionalis ), currently federally listed as a threatened
species, and Indiana Bat (Myotis sodalis ), currently federally listed as an
endangered species, informal consultation on the construction activities associated
with the auxiliary spillway upgrade portion of the project began on March 23,
2016. Duke Energy has agreed to implement the following protective measures
into the auxiliary spillway upgrade plans to avoid impacts to these species: 1)
Trees within the 3 -acre blasting and clearing area will be cut during the winter
(October 15 -April 15) to avoid the maternity roost period for Indiana Bat and
Northern Long -Eared Bat; 2) If any random trees must be cut during the summer
January 9, 2017
Letter
Janet Mizzi
USFWS
roost period, this office will be notified and an experienced biologist will conduct
an on-site habitat assessment to determine if trees are suitable maternity roost
trees; 3) If the tree(s) to be cut are suitable roost trees, an emergence survey will be
conducted before tree removal; and 4) All potential suitable roost trees identified
adjacent to the project area will be marked and protected during clearing activities.
With the implementation of these measures, we have concurred with Duke
Energy's "not likely to adversely affect" determination for the project. Informal
consultation for the auxiliary spillway upgrade project was concluded on August
19, 2016. Thus, we believe the requirements under section 7 of the Act are
fulfilled.
5. Obligations under section 7 of the Act must be reconsidered if: (1) new
Duke Energy will consult with the USFWS if new information becomes available during
information reveals impacts of this identified action that may affect listed species
the auxiliary spillway upgrade project.
or critical habitat in a manner not previously considered, (2) this action is
January 9, 2017
Letter
Janet Mizzi
USFWS
subsequently modified in a manner that was not considered in this review, or (3) a
new species is listed or critical habitat is determined that may be affected by the
identified action.
1. NCWRC staff have reviewed the drawdown plan and does not have objections.
Comment noted.
We appreciate the opportunity to review the plan and your efforts to maintain
January 3, 2017
Email
Chris Goudreau
NCWRC
minimum flows and recreational flows in the Tuckasegee River.
January 3, 2017
Email
Chris Goudreau
NCWRC
2. Please keep John Macemore informed of the drawdown schedule so we can
Duke Energy will continue to coordinate closely with the NCWRC regarding the
properly notify boat access area users of the closure.
drawdown schedule and duration.
Page 3 of 3
E-26

Kulpa, Sarah
Subject: FW: East Fork Hydro Project - Drawdown Plan for Cedar Cliff Lake
From: Tarver, Fred [mailto:[e-mail]]
Sent: Wednesday, January 18, 2017 2:46 PM
To: Johnson, Steve; Barnett, Kevin
Cc: Bryan Tompkins; Goudreau, Chris J.; Higgins, Karen
Subject: RE: East Fork Hydro Project - Drawdown Plan for Cedar Cliff Lake
Steve,
Without prejudice to any terms and conditions of a subsequent 401 Certification issued by DWR for the proposed
project modifications, the proposal seems reasonable with the following observation:
The periodicity of shoreline inspection of at least once per month should be shorter during and immediately after
reaching the -30 ft target when the lake bottom is saturated and more susceptible to erosion. During this early phase
inspections should follow rain events. The time between inspections could be lengthened as the exposed lake bottom
hardens and the weather patterns, and the associated drought, change. Also, Duke Energy should be responsive to the
observations and concerns of the adjacent land owners regarding erosion and water quality.
Thanks for the opportunity to comment.
Fred
Fred R Tarver III
Instream Flow Program Supervisor
Department of Environmental Quality
919-707-9029 office
fred.tarver(a)ncdenr.aov
Division of Water Resources
1611 Mail Service Center
Raleigh NC 27699-1611
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Johnson, Steve [mailto:[e-mail]]
Sent: Wednesday, January 18, 2017 8:49 AM
To: Tarver, Fred <[e-mail]>; Barnett, Kevin <[e-mail]>
Cc: Bryan Tompkins <bryan [e-mail]>; Goudreau, Chris J. <[e-mail]>
Subject: FW: East Fork Hydro Project - Drawdown Plan for Cedar Cliff Lake
E-27

Fred and Kevin: Just a friendly reminder, we would like to have your comments on the drawdown plan for Cedar Cliff
Reservoir associated with the Spillway Expansion. If you don't have any comments please let me know by responding to
this email.
Thanks guys.
Steve Johnson
Duke Energy Carolinas
Water Strategy and Hydro Licensing
704-382-4240
704-754-6618
[e-mail]
From: Johnson, Steve
Sent: Thursday, December 15, 2016 3:57 PM
To: Bryan Tompkins; Goudreau, Chris; Fred Tarver; Barnett, Kevin
Subject: East Fork Hydro Project - Drawdown Plan for Cedar Cliff Lake
Good Afternoon:
Attached is a letter concerning a drawdown planned for Cedar Cliff Lake in conjunction with the Auxiliary Spillway
Upgrade. As described in the attachment Duke Energy would appreciate your input within 30 days. Please let me know
if you have any questions.
Thanks for all your help and I hope you have a great Christmas and New Year holiday!
Steve Johnson
Duke Energy Carolinas
Water Strategy and Hydro Licensing
704-382-4240
704-754-6618
[e-mail]
E-28

United States Department of the Interior
FISH AND WILDLIFE SERVICE
Mr. Jeffrey Lineberger
Duke Energy Carolinas, LLC
526 South Church Street
Charlotte, North Carolina 28202
Dear Mr. Lineberger:
Asheville Field Office
160 Zillicoa Street
Asheville, North Carolina 28801
January 9, 2017
Subject: Duke Energy Carolinas, LLC East Fork Hydroelectric Project (P-2698), Draft Cedar
Cliff Lake Drawdown Plan for the Cedar Cliff Hydroelectric Development Auxiliary
Spillway Upgrade Project, in Jackson County, North Carolina
On December 15, 2016, we received (via e-mail) your letter including details of the project and
project plans. We have reviewed the information presented and are providing the following
comments in accordance with the provisions of the Fish and Wildlife Coordination Act, as
amended (16 U.S.C. 661-667e), and section 7 of the Endangered Species Act of 1973, as
amended (16 U.S.C. 1531-1543) (Act).
According to the information presented, Duke Energy Carolinas, LLC (Duke Energy) is
proposing a reservoir drawdown at Cedar Cliff Lake to facilitate upgrade construction on the
emergency (auxiliary) spillway. The proposed auxiliary spillway upgrade project will require
that the lake level of Cedar Cliff Lake be dropped about 30 feet from full pond elevation (2,330
ft amsl) for about 16 months beginning in August 2018. Cedar Cliff Lake elevation will be
lowered by releasing flows through a combination of the generating units and /or spillway gate at
a rate no greater than three feet per 24 hours (average of 0.13 ft/hr) until the desired lake
elevation of 2,300 ft amsl is achieved. Upon completion of the project, Cedar Cliff Lake will be
refilled based on inflows but no greater than three feet per 24 hours until Normal Target
Elevation is achieved.
Comments and Recommendations. Duke Energy is proposing to lower the lake level at a rate
of about 3 -feet per day until the desired lake level is achieved. We generally recommend a
drawdown rate of between one and three feet per day. Although the three feet per day drawdown
is at the upper end of our recommended range, we do not object to the proposal submitted by
Duke Energy. However, throughout the drawdown process we recommend that consistent
monitoring be conducted for erosion of exposed shoreline areas and for the occurrence of fish
E-29

stranding in shallow lake areas. If shoreline erosion/destabilization or fish stranding occurs, we
recommend that the instances be documented and submitted to the resource agencies for review.
In that case, the drawdown rate may need to be decreased to reduce the likelihood of these
impacts from continuing to occur. Additionally, we recommend that the following measures be
implemented to further minimize the effects of the proposed project on fish and wildlife
resources:
Develop a plan to monitor and mitigate for erosion along the exposed reservoir banks.
After rain events, areas near storm water outfall pipes or culverts that release high
velocity discharges onto exposed banks should be inspected for erosive reels or mass
wasting. The plan should include measures that will be implemented should
erosive/mass wasting areas be found that are contributing sediment to the river channel.
We recommend the use of straw bales or other devices at problem sites to decrease
velocity of water, decrease erosion, and minimize the amount of sediment released. Any
problem areas should be documented. Information on documented problem areas should
be maintained to focus efforts on erosion control during any future drawdowns.
2. Establish a specific plan to have a qualified biologist identify and enumerate stranded fish
during the upcoming drawdown. Duke Energy should assess the data, and consult with
resource agencies to determine if fish populations are being distressed by the drawdown.
If it is determined that fish are being stranded at levels that will impact fishery
populations, we recommend that Duke Energy arrange for additional stocking of fish
(based on the number and species of stranded fish observed during the drawdown)
following the return of the reservoir to normal operating levels.
3. Mitigate for the loss of recreational fishing at Cedar Cliff Lake by providing financial
support to North Carolina Wildlife Resources Commission to install fish habitat/attractors
within the reservoir during the drawdown.
4. Develop a Spill Prevention, Control, and Countermeasure (SPCC) Plan to describe
measures to prevent, contain, and clean up petroleum spills from construction activities
associated with the auxiliary spillway upgrade.
Endangered Species. According to our records and a review of the information presented, we
do not believe that federally listed species or their habitats will be impacted by the proposed
drawdown of Cedar Cliff Lake. Due to potential impacts to Northern Long -Eared Bat (Myotis
septentrionalis), currently federally listed as a threatened species, and Indiana Bat (Myotis
sodalis), currently federally listed as an endangered species, informal consultation on the
construction activities associated with the auxiliary spillway upgrade portion of the project began
on March 23, 2016. Duke Energy has agreed to implement the following protective measures
into the auxiliary spillway upgrade plans to avoid impacts to these species: 1) Trees within the 3 -
acre blasting and clearing area will be cut during the winter (October 15 -April 15) to avoid the
maternity roost period for Indiana Bat and Northern Long -Eared Bat; 2) If any random trees
must be cut during the summer roost period, this office will be notified and an experienced
biologist will conduct an on-site habitat assessment to determine if trees are suitable maternity
roost trees; 3) If the tree(s) to be cut are suitable roost trees, an emergence survey will be
N
E-30

conducted before tree removal; and 4) All potential suitable roost trees identified adjacent to the
project area will be marked and protected during clearing activities. With the implementation of
these measures, we have concurred with Duke Energy's "not likely to adversely affect"
determination for the project. Informal consultation for the auxiliary spillway upgrade project
was concluded on August 19, 2016. Thus, we believe the requirements under section 7 of the
Act are fulfilled. However, obligations under section 7 of the Act must be reconsidered if -
(1)
£(1) new information reveals impacts of this identified action that may affect listed species or
critical habitat in a manner not previously considered, (2) this action is subsequently modified in
a manner that was not considered in this review, or (3) a new species is listed or critical habitat is
determined that may be affected by the identified action.
We appreciate the opportunity to provide these comments. If we can be of assistance or if you
have any questions, please do not hesitate to contact Mr. Bryan Tompkins of our staff at
828/258-3939, Ext. 240. In any future correspondence concerning this project, please reference
our Log Number 4-2-17-133.
Sincerely,
- original signed —
Janet Mizzi
Field Supervisor
E -Copy: Mr. Chris Goudreau, North Carolina Wildlife Resources Commission
Mr. Fred Tarver, North Carolina Division of Water Resources
Mr. Kevin Barnett, North Carolina Division of Water Resources
Mr. Steve Johnson, Duke Energy Carolinas, LLC
E-31

Kulpa, Sarah
Subject: FW: East Fork Hydro Project - Drawdown Plan for Cedar Cliff Lake
From: Goudreau, Chris J.[mailto:[e-mail]]
Sent: Tuesday, January 03, 2017 10:21 AM
To: Johnson, Steve; Bryan Tompkins; Tarver, Fred; Barnett, Kevin
Cc: Leslie, Andrea J; Wheeler, A. Powell; Macemore, John W.
Subject: RE: East Fork Hydro Project - Drawdown Plan for Cedar Cliff Lake
Steve,
NCWRC staff have reviewed the drawdown plan and does not have objections. We appreciate the opportunity to review
the plan and your efforts to maintain minimum flows and recreational flows in the Tuckasegee River. Please keep John
Macemore informed of the drawdown schedule so we can properly notify boat access area users of the closure.
Happy New Year,
Chris
Chris Goudreau
Hydropower & Special Projects Coordinator
Habitat Conservation Division
NC Wildlife Resources Commission
645 Fish Hatchery Road
Marion, NC 28752
office: 828-652-4360 ext. 223
mobile: [phone]
[e-mail]
ncwildlife.org
From: Johnson, Steve [mailto:[e-mail]
Sent: Thursday, December 15, 2016 3:57 PM
To: Bryan Tompkins <bryan [e-mail]>; Goudreau, Chris J.<[e-mail]>; Tarver, Fred
<[e-mail]>; Barnett, Kevin <[e-mail]>
Subject: East Fork Hydro Project - Drawdown Plan for Cedar Cliff Lake
Good Afternoon:
Attached is a letter concerning a drawdown planned for Cedar Cliff Lake in conjunction with the Auxiliary Spillway
Upgrade. As described in the attachment Duke Energy would appreciate your input within 30 days. Please let me know
if you have any questions.
Thanks for all your help and I hope you have a great Christmas and New Year holiday!
Steve Johnson
Duke Energy Carolinas
Water Strategy and Hydro Licensing
E-32

(� DUKE
ENERGY
December 15, 2016
Via electronic mail
Mr. Kevin Barnett
NC Division of Water Resources
2090 U.S. 70 Highway
Swannanoa, NC 28778
Mr. Fred Tarver
NC Division of Water Resources
1611 Mail Service Center
WATER STRATEGY, HYDRO
LICENSING AND LAKE SERVICES
Duke Energy Corporation
526 South Church Street
Charlotte, NC 28202
Mr. Chris Goudreau
NC Wildlife Resources Commission
645 Fish Hatchery Road
Marion, NC 28752
Mr. Bryan Tompkins
Asheville Field Office
U.S. Fish and Wildlife Service
Raleigh, NC 27699-1611 160 Zillicoa Street
Asheville, North Carolina 28801
Subject: East Fork Hydroelectric Project (FERC No. 2698)
Cedar Cliff Hydroelectric Development Auxiliary Spillway Upgrade
Consultation for Scheduled Drawdown
Dear Messrs. Barnett, Tarver, Goudreau and Tompkins:
Duke Energy Carolinas, LLC (Duke Energy) herein provides the enclosed information for your review and
comment on an upcoming scheduled drawdown at the Cedar Cliff Hydroelectric Development of the
East Fork Hydroelectric Project (Project). The Cedar Cliff Development is located on the East Fork of the
Tuckasegee River in Jackson County, North Carolina. The Cedar Cliff Development is the most
downstream of the three developments in the Project. The Bear Creek Development is immediately
upstream of Cedar Cliff and the Tennessee Creek Development is immediately upstream of the Bear
Creek Development.
As further discussed in the enclosed information, the proposed drawdown is necessary to complete
modifications of the Cedar Cliff Dam and associated auxiliary spillway as required by the Federal Energy
Regulatory Commission (FERC) Atlanta Regional Office (ARO) to satisfy safe passage of the Inflow Design
Flood (IDF), which is defined as the Probable Maximum Flood (PMF), without overtopping Cedar Cliff
Dam. In order to complete the aforementioned work, Cedar Cliff Lake will need to be drawn down
approximately 30 feet for the duration of construction (anticipated to be approximately 16 months)
planned for August 2018 through November 2019.
Duke Energy is in the process of obtaining applicable federal and state permits and licenses to perform
this work, including a Section 404/Section 10 permit from the U.S. Army Corps of Engineers and a
Section 401 Water Quality Certification from the North Carolina Department of Environmental Quality,
Division of Water Resources (NCDWR).
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East Fork Hydroelectric Project (P-2698)
Cedar Cliff Hydroelectric Development Auxiliary Spillway Upgrade
Consultation for Scheduled Drawdown
December 15, 2016
Page 2
In addition to the aforementioned permits, Duke Energy is required to maintain compliance (or obtain
approval for a variance) with the existing FERC License and associated plans and water quality
certification as well as the Tuckasegee Cooperative Stakeholder Team Settlement Agreement, as
applicable.
Accordingly, Duke Energy will be seeking FERC approval for a temporary variance from License Article
401 Reservoir Level Management for the Cedar Cliff Lake drawdown necessary to complete the FERC -
required auxiliary spillway modifications.
Duke Energy respectfully requests submittal of any comments on the enclosed information within 30
days of the date of this letter. Subsequently, Duke Energy will address any comments received and
submit the final Cedar Cliff Lake Drawdown Plan to FERC requesting approval of the temporary reservoir
level variance.
If you have any questions about the enclosed information, please contact Mr. Steve Johnson at (704)
382-4240 or [e-mail].
Sincerely,
Jeffrey G. Lineberger, PE
Director, Water Strategy & Hydro Licensing
Duke Energy Carolinas, LLC
Enclosure: Draft Cedar Cliff Lake Drawdown Plan
cc w/enclosure: Steve Johnson, Duke Energy
Phil Fragapane, Duke Energy
Brad Keaton, Duke Energy
Lynne Dunn, Duke Energy
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Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Hydroelectric Development Auxiliary Spillway Upgrade Project
Draft Cedar Cliff Lake Drawdown Plan
1.0 INTRODUCTION
The East Fork Hydroelectric Project is owned and operated by Duke Energy Carolinas, LLC (Duke
Energy) under a license issued by the Federal Energy Regulatory Commission (FERC) on May 4, 2011.
The East Fork Hydroelectric Project consists of three hydroelectric developments which are, from
upstream to downstream, Tennessee Creek, Bear Creek, and Cedar Cliff with a combined authorized
installed capacity of 24.280 megawatts (MW)'. The Cedar Cliff Development includes Cedar Cliff Dam
located on the East Fork of the Tuckasegee River near river mile 52.1 in Jackson County, North Carolina.
Via letter dated April 24, 2014, the FERC Atlanta Regional Office (ARO) required Duke Energy to satisfy
safe passage of the Inflow Design Flood (IDF), which is defined as the Probable Maximum Flood (PMF),
without overtopping Cedar Cliff Dam. The preferred remedial alternative to safely pass the PMF involves
modifications to the existing auxiliary spillway channel and main dam toe berm, placement of an
approximately seven feet high concrete parapet wall along the crest of the dam, and installation of fuse
gates within the auxiliary spillway control section. The FERC Project Boundary will be enlarged to
incorporate approximately three acres of land currently owned by Duke Energy to encompass the project
modifications and enlargement of the auxiliary spillway channel.
In order to complete the aforementioned work, Cedar Cliff Lake will need to be drawn down approximately
30 feet from Full Pond Elevation for the duration of construction (anticipated to be approximately 16
months). Duke Energy has prepared this Drawdown Plan to describe the procedures and schedule
associated with the Cedar Cliff Lake drawdown and measures to maintain compliance with the state
water quality certification, FERC license and associated plans, and the Tuckasegee Cooperative
Stakeholder Team Settlement Agreement, as applicable.
2.0 PROJECT DESCRIPTION
The Cedar Cliff Development consists of a 590 -foot -long, 173 -foot -wide, earth -and -rock fill dam with a
crest elevation of 2,343.5 feet above mean sea level (ft amsl). The dam impounds Cedar Cliff Lake with a
surface area of 121 acres and approximately five miles of shoreline at Full Pond Elevation 2,330 ft amsl.
A service spillway is located at the right abutment of the dam and has one Tainter gate. An emergency
(auxiliary) spillway is located at the left abutment of the dam which contains two erodible fuse plug
sections. Water flows into the intake located in the right abutment of the dam containing one slide gate
with trashracks, and travels down the 1,138 -foot -long power tunnel and penstock to the main powerhouse
Duke Energy Carolinas, LLC, 143 FERC ¶ 62,203 (2013).
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Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Development Auxiliary Spillway Upgrade Project
Draft Cedar Cliff Lake Drawdown Plan
Page 2
that contains one vertical Francis -type generating unit with an installed capacity of 6.140 MW and a
hydraulic capacity of 555 cubic feet per second (cfs). In 2012, Duke Energy installed a new minimum flow
unit with an installed capacity of 395 kilowatts (kW) and a hydraulic capacity of 35 cfs, which is housed in
a new small powerhouse adjacent to the main powerhouse at the Cedar Cliff Development. The Cedar
Cliff Development includes a 0.46 -mile -long bypassed reach from the base of the dam to the powerhouse
which empties to the East Fork of the Tuckasegee River.
The Cedar Cliff Development has one public recreation site, the Cedar Cliff Lake Access Area improved
with a boat ramp, a pier, a portable toilet, and parking.
The FERC Project Boundary for the East Fork Project encompasses approximately 1,462 acres, including
23.15 acres of the Nantahala National Forest administered by the U.S. Forest Service (USFS) adjacent to
the Bear Creek and Tennessee Creek Developments. The project boundary around the Cedar Cliff
Development encloses the dam and reservoir, powerhouse, spillway, penstock, a 0.46 -mile -long
bypassed reach, and one public recreation site and does not include federal lands.
3.0 DRAWDOWN PLAN
3.1 Drawdown and Refill Rate
Cedar Cliff Lake elevation will be lowered by releasing flows through a combination of the generating
units and/or spillway gate at a rate no greater than three feet per 24 hours (average of 0.13 ft per hour) on
a continuous basis until the desired lake elevation is achieved. Full Pond Elevation is 2,330 ft amsl and
the desired pond elevation during construction is approximately 2,300 ft amsl (30 ft below Full Pond
Elevation).
Cedar Cliff Lake will be held at approximately 2,300 ft amsl for the duration of construction activities by
releasing flows through a combination of the generating units and/or spillway gate, as necessary.
Upon completion of construction activities, Cedar Cliff Lake will be refilled based on inflows, but at a rate
no greater than three feet per 24 hours (average of 0.13 foot per hour) on a continuous basis until the
Normal Target Elevation (i.e., 2,328.0 ft amsl) is achieved.
3.2 Schedule
Duke Energy anticipates the duration of construction activities at the Cedar Cliff Development will be
approximately 16 months with construction planned for August 2018 through November 2019.
Accordingly, the Cedar Cliff Lake drawdown would begin in early July 2018 and the refill would begin in
December 2019.
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Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Development Auxiliary Spillway Upgrade Project
Draft Cedar Cliff Lake Drawdown Plan
Page 3
3.3 Public Outreach
Based on the duration and extent of the Cedar Cliff Lake drawdown, Duke Energy will perform public
outreach measures to notify land owners abutting Cedar Cliff Lake and primary lake users of the planned
drawdown. Duke Energy public outreach will include the following:
• Provide information related to the schedule and associated impacts of the Cedar Cliff Lake
drawdown on the existing Cedar Cliff Lake website;
■ Post a sign(s) at the Cedar Cliff Lake Access Area notifying users of the schedule of the
drawdown and associated impacts and restrictions;
■ Provide written notification of the drawdown to land owners abutting the Cedar Cliff Lake;
■ Provide written notification of the drawdown to primary lake users such as local recreation
outfitters;
■ Coordinate with the North Carolina Wildlife Resources Commission (NCWRC) pursuant to
the existing agreement between Duke Energy and the NCWRC; and
■ Provide press releases in local news outlets.
3.4 Sediment and Erosion Control
Duke Energy has developed and will implement an Erosion and Sediment Control Plan to prevent
sedimentation impacts to water resources. Best Management Practices (BMP) in the vicinity of
construction activities will include, but not be limited to, installing protective silt fence, restricting the use of
wet concrete within surface waters, and implementing and maintaining a spill prevention plan for heavy
equipment. The work area will be inspected daily for signs of erosion or degradation and device failure.
Following construction, all disturbed areas will be restored and re -graded to preconstruction grades and
re -vegetated with native vegetation.
Throughout the duration of the Cedar Cliff Lake drawdown, Duke Energy will periodically (i.e., at least
once per month) monitor the Cedar Cliff Lake shoreline to assess the need for shoreline erosion control
measures and install remediation measures as needed. Remedial measures may include use of straw
bales or similar to decrease velocity of waters, decrease erosion, and minimize the amount of sediment
released to Cedar Cliff Lake.
Sediment and erosion control measures will be implemented and maintained, as necessary per the
requirements of the state water quality certification and to maintain compliance with the state water
quality standards, statutes, or rules.
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Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Development Auxiliary Spillway Upgrade Project
Draft Cedar Cliff Lake Drawdown Plan
Page 4
4.0 LICENSE COMPLIANCE
4.1 Article 401 — Reservoir Level Management
4.1.1 License Requirement
License Article 401 requires the licensee to operate the Cedar Cliff Development according to the
reservoir level management provisions, as required by Condition 6 of the North Carolina Department of
Environmental Quality, Division of Water Resources (NCDWR) water quality certification (WQC) to protect
the aquatic and recreation resources in the Tuckasegee River and to provide downstream flows.
Pursuant to Article 401 and WQC Condition 6, the Normal Operating Range for Cedar Cliff Lake is 2,326
to 2,330 ft amsl year-round.
4.1.2 License Compliance
Duke Energy will seek approval from the FERC for a temporary variance from the requirements of Article
401 in order to hold the pond level at approximately 2,300 ft amsl for the duration of the required
drawdown period to complete construction activities at the Cedar Cliff Development. Requirements
needed for temporary variances in lake level requirements are addressed in the Hydro Project
Maintenance and Emergency Protocol, which is included as Appendix A in the East Fork License.
4.2 Article 402 — Recreation Plan
4.2.1 License Requirement
License Article 402 requires the licensee to file with FERC for approval within one year of license
issuance, a Recreation Plan for the East Fork Hydroelectric Project to enhance the recreation resources
at the Project. Duke Energy filed a Recreation Plan with FERC for approval on December 19, 2011,
which was supplemented on March 5, 2012. On November 27, 2012, the FERC issued an Order
Modifying and Approving the Recreation Plan.
As stated above and in the Recreation Plan, the Cedar Cliff Development includes one recreation area,
the Cedar Cliff Lake Access Area that provides a boat ramp, pier, seasonal portable toilet, and parking.
Duke Energy does not currently charge a fee for public use of the access area facilities, which are open
for use at all times.
The Cedar Cliff Lake Access Area is currently maintained through a cooperative maintenance agreement
with NCWRC.
4.2.2 License Compliance
The boat ramp at the Cedar Cliff Access Area will be unusable during the drawdown. Pursuant to the
requirements of the FERC -approved Recreation Plan and associated agreement with the NCWRC, Duke
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Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Development Auxiliary Spillway Upgrade Project
Draft Cedar Cliff Lake Drawdown Plan
Page 5
Energy will coordinate with the NCWRC for methods for closure of the Cedar Cliff Lake Access Area and
public notification during the drawdown period.
4.3 Article 403 — Public Information at East Fork Project
4.3.1 License Requirement
License Article 403 requires the licensee to continue to provide information on reservoir levels and
recreation flows on its website for Cedar Cliff Lake.
4.3.2 License Compliance
Duke Energy will provide information related to the schedule and associated impacts of the Cedar Cliff
Lake drawdown on the existing Cedar Cliff Lake website.
4.4 Article 404 — Minimum Flow
4.4.1 License Requirement
License Article 404 (as amended )2 requires the licensee to release minimum flow from the Cedar Cliff
reservoir, as required by WQC Condition 6 consisting of a flow during non -generation hours of 10 cfs from
December 1 through June 30 and 35 cfs from July 1 through November 30, or during low inflow periods a
flow of 6 cfs from December 1 through June 30 and 11 cfs from July 1 through November 30, each year,
from the Cedar Cliff Powerhouses to the East Fork of the Tuckasegee River.
4.4.2 License Compliance
Duke Energy will continue to provide the minimum flows from the Cedar Cliff Powerhouses required by
Article 404 and WQC Condition 6 and pursuant to the FERC -approved Minimum Flow and Flow
Monitoring Plan.
In the event the required minimum flows cannot be provided during the drawdown period due to low
inflow, Duke Energy will provide written notification pursuant to the FERC -approved Minimum Flow and
Flow Monitoring Plan and Low Inflow Protocol.
4.5 Article 405 — Recreation Flow
4.5.1 License Requirement
License Article 405 requires the licensee to operate the East Fork Project to provide scheduled recreation
flow releases at or above the best efficiency flow into the main stem of the Tuckasegee River during the
recreation season.
2 Duke Energy Carolinas, LLC, 138 FERC ¶ 62,146
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Duke Energy Carolinas, LLC
East Fork Hydroelectric Project (P-2698)
Cedar Cliff Development Auxiliary Spillway Upgrade Project
Draft Cedar Cliff Lake Drawdown Plan
Page 6
4.5.2 License Compliance
Duke will continue to provide the recreation flows required by Article 405.
4.6 Article 414 — Programmatic Agreement
4.6.1 License Requirement
License Article 414 requires the licensee to implement the "Final Programmatic Agreement Among the
Federal Energy Regulatory Commission and the North Carolina State Historic Preservation Officer for
Managing Historic Properties that may be Affected by a License Issuing to Duke Power Company, LLC
for the Continued Operation and Maintenance of the East Fork Hydroelectric Project in Jackson County,
North Carolina," executed on September 19, 2006, and including but not limited to the approved Historic
Properties Management Plan (HPMP), filed August 7, 2006, for the Project.
The 2006 HPMP includes special provisions associated with large, planned, extended drawdowns, which
is defined as any planned drawdown where the pond elevation will remain at least 10 feet below the
Normal Minimum Elevation for a minimum of 30 consecutive days. Specifically, the provision states that in
the event of a large, planned, extended drawdown, the Licensee will consult with the North Carolina State
Historic Preservation Office (NCSHPO) and the Eastern Band of Cherokee Indians (EBCI) Tribal Historic
Preservation Office (THPO) regarding the need to conduct archaeological surveys of the exposed area.
4.6.2 License Compliance
Pursuant to the requirements of the 2006 HPMP, Duke Energy sent a letter dated August 5, 2016 to the
NCSHPO and EBCI THPO providing notification and description of the planned construction activities and
associated drawdown at the Cedar Cliff Development. No response was received by Duke Energy from
the EBCI THPO. Via letter dated August 30, 2016, the NCSHPO indicated it is unlikely that any
archaeological resources that may be eligible for inclusion in the National Register of Historic Places will
be adversely affected by the planned construction activities and drawdown. The NCSHPO requested that
Duke Energy take photographs to document the current condition of the dam and its surroundings
pursuant to their guidelines.
Duke Energy is in the process of completing the photographic documentation of the Cedar Cliff Dam and
its surroundings pursuant to the NCSHPO's request and guidelines.
5.0 CONSULTATION
[To be inserted upon completion of consultation with agencies.]
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Environmental Report OR
Cliff Auxiliary Spillway Upgrade
May 2019 1 F-1

Cedar Cliff Hydroelectric Development Auxiliary Spillway Upgrade Project
Proposed Duke Energy Water Quality Monitoring Plan
Project Overview
In 2014, the FERC established the Inflow Design Flood (IDF) for Cedar Cliff development as
the Probable Maximum Flood (PMF). Prior to the FERC notice, the OF had been 40
percent of the PMF. The existing spillway discharge capacity is insufficient to pass the PMF
without overtopping the dam and resulting in potential failure of the structure. Engineering
design efforts are underway to expand the existing auxiliary spillway (width and depth) and
install Hydroplus-Fusegates as the control section. In addition, the existing parapet wall will
be replaced with a PMF Wall to create additional storage for the Cedar Cliff
reservoir. Studies have indicated the expanded auxiliary spillway, Fusegates, and PMF
Wall provide the necessary measures to safely pass the OF without overtopping Cedar Cliff
Dam.
The construction project is scheduled to begin July, 2019 and be completed December,
2020. The present plan specifies excavating material (approximately 283,200 cubic yards)
from the mountain hillside east of the current fuse plug (Figure 1). A gravel filter berm at the
lower end of the auxiliary spill channel will provide sediment and erosion control from the
excavations.
During construction, the lake will be lowered 30 ft to accommodate the construction activities
including staging the excavated material on the foot print of the existing fuse plug approach
channel. The excavated material will be loaded onto barges and spoiled into Cedar Cliff
Lake upstream of the dam (Figure 2) (for discussion and review of submerged disposal, see
HDR 2018a). As specified in the USACE 404/401 permit, a 3-5 ft floating turbidity barrier will
be installed at all work areas that are in, or adjacent to surface waters.
As discussed by HDR (2018a), pyrite (FeS2) was identified in rock exposures at the site and
in the rock core from boreholes drilled for the subsurface investigation (HDR 2017).
Subsequent petrographic analyses of metasedimentary rocks of the Tallulah Falls Formation
(TFFm) collected from the rock cores found that the garnet mica schist, mica schist, and
schistose biotite gneiss lithologies contained 2 percent to 7 percent pyrite by volume (HDR
2017). Based on the boreholes drilled during the geological/ geotechnical site investigation
for the Auxiliary Spillway upgrades, approximately 26 percent of the total excavated material
(73,600 cubic yards) will be made up of these three rock lithologies.
Even though there are no known instances of acid -drainage related to the metasedimentary
rocks of the TFFm in the region surrounding the site; rocks with greater than 1 percent pyrite
and/or pyrrhotite by volume are considered to be potentially acid -producing. Pyrite can react
in the presence of atmospheric oxygen and water to form ferrous sulfate and sulfuric acid
(2FeS2 + 702 + 2H2O -> 2FeSO4 + 2H2SO4). The stoichiometry of complete oxidation of one
mole of pyrite would produce 4 equivalents of hydrogen ions. Although some acid -drainage
is produced by natural weathering, construction activities can expose large volumes of rock
containing sulfide minerals to oxidizing conditions. The oxidation of pyrite and subsequent
acid production increase significantly when exposed to atmospheric oxygen and particle size
becomes smaller and smaller (Pugh et.al. 1984). Subsequent leaching of the oxidation
products by rainfall/groundwater result in the formation of acid drainage which is
F-2

Proposed Duke Energy Monitoring Plan
characterized by low pH values, high concentrations of sulfate, and mobilization of metals
such as iron, aluminum, and manganese.
Bosch and Meckenstock (2012) have suggested anaerobic nitrate -dependent microbial
pyrite oxidation may also contribute to acid production. Geochemical and stable isotope field
data from anaerobic aquifers indicate that denitrification was associated with pyrite
oxidation. Laboratory studies were more ambiguous, but suggested that this process may
occur under some conditions. The molecular mechanism of pyrite oxidation coupled with
denitrification is not well understood.
Factors affecting the amount of Acid -Production
• Percent Pyrite in Rock
• Morphology and grain size of the iron sulfide minerals
• Particle size of excavated material (surface area of disturbed or spoiled rock)
• Presence of certain iron bacteria (primarily Thiobacillus ferrooxidans)
• Presence of alkalinity producing material
• Oxygen concentration
• Nitrate
In addition to the factors affecting the amount of acid production, the characteristics of
Cedar Cliff Reservoir (Table 1) also influence the amount of oxidation products in the
reservoir and downstream reaches. For example, the wide range of pH values reflected the
poor buffering capacity of the low alkalinity water as biological activity metabolized carbon
dioxide. In addition, the very low ionic strength, as measured by conductivity, also influenced
the ability to measure accurate pH values as well as indicating the poor buffering capacity.
The relatively high oxygen concentrations in the lake would favor higher rates of pyrite
oxidation, but these rates would be very low compared to exposure to atmospheric oxygen.
The low nitrate concentrations would limit the amount of de -nitrification associated with
anaerobic nitrate -dependent microbial pyrite oxidation. Probably the most significant factor
limiting the accumulation of pyrite oxidation products in the lake is the very high flushing rate
of the reservoir (Table 1). The average retention time of the water at full pool is 15.3 days;
at a 30 foot drawdown the average retention time of the water is reduced to 8.1 days. Also,
at the 30 foot drawdown, the only way to maintain the lake level is by the hydro operation,
which draws water from the bottom of the lake further reducing the accumulation of
oxidation products in the lake.
Even though HDR (2017), HDR (2018a), and HDR (2018b) have discussed the project in
detail and have projected minimum, if any, acidification impacts from pyrite oxidation, and
the lake characteristics also suggest a lack of accumulation of acidic water, the potential
does exist for an alteration of the water quality. The proposed monitoring program is
designed to assess any direct changes in water quality due to pyrite oxidation.
Page 2 of 8
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Proposed Duke Energy Monitoring Plan
Table 1. Cedar Cliff Reservoir Characteristics
Parameter Units
Full Pond (Spillway Elevation)
2330 ft-msl
Tainter Gate Elevation
2305 ft-msl
30 Foot Drawdown Elevation
2300 ft-msl
Cedar Cliff Hydro intake Elevation
2202 ft-msl
Proposed Elevation of Top of Rock Spoil
2250 ft-msl
Lake Volume below Full Pond
6320 ac -ft
Lake Volume below Tainter Gate
3742 ac -ft
Lake Volume below 30 foot drawdown
3386 ac -ft
Lake Volume below hydro intake
42 ac -ft
Mean Outflow'
209.0 cfs
Mean Retention Time (full pond)
15.3 days
Mean Retention Time (30 foot drawdown)
8.1 days
Max Depth at Dam (full pond)
148 ft
Max Depth mid -lake sampling (full pond)
106 ft
pH range2
5.7-8.0
Mean Alkalinity2
0.13 meq/1
Conductivity Rangel
14-20 uSi
Mean Oxygen below 2250 ft-ms12
7.8 mg/l
Minimum observed oxygen2
4.2 mg/l
Mean Nitrate2
0.019 mg/l
1 Calculated from Cedar Cliff operations (1953-2013)
2 from NCDENR data reported in NP&L (2000)
Figure 1. Cedar Cliff Spill Channels and Proposed Excavation and Construction Areas with
Proposed Water Quality Sampling Sites (pink circles)
Page 3 of 8
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Proposed Duke Energy Monitoring Plan
Figure 2. Bathymetric Map of Cedar Cliff Reservoir Showing the Proposed Spoil Areas, the Hydro Intake, and the Downstream
Reach with Proposed Water Quality Sampling Sites (red circles)
i Ii ceaarC-rraowemouseTunnel Mlet Cedar Cliff Lake $athymetry
010 -Foot C oatows
I I I I I{ I I i I i i i i i i i i I h ��,a„QL aye n LS E— hG MM.
:o3-Jrab S-%mLr'?;o .Ca " Stat Pae NNMB UE 8w&Y Poor htWCrnher X9:5
Page 4 of 8
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Proposed Duke Energy Monitoring Plan
Cedar Cliff Monitoring Rationale
Most environmental monitoring programs directly assess water quality or employ various
indices for biological impacts, usually macroi nve rte b rates in streams. The proposed
water quality assessment is designed to directly address the potential impact of the rock
spoil in the reservoir, the spill channel, and the Tuckasegee River below the excavation
site.
The biological communities, particularly macro -invertebrates, are influenced by many
factors and rarely exhibit a direct cause and effect of a perturbation. He et.al. (2015),
Svitok et.al. (2014), Gray and Delaney (2008), and DeNicola and Stapleton (2016) have
reviewed the use of macro -invertebrate communities to assess acid mine drainage with
mixed results. Unless the pH was extremely low or significant iron oxide precipitation
was covering the substrates, many diversity indices, biological integrities, density and
taxonomic diversities, and various community metrics applied to macroinvertebrate
populations showed highly variable results in streams with acid -mine drainage.
The NCDENR (2011) reported good to excellent benthic communities in streams with
low pH (mean 5.98, range 5.4-6.9). These data suggest that the use of benthic
communities to assess the impact of low pH values was limited. Macro -invertebrate
communities are extremely difficult to assess in the deeper portions of reservoirs and are
probably non-existent in the dry spill channel. Cedar Cliff hydro discharge into the
riverine habitat is very different than the Lake Habitat downstream of Bear Creek Hydro.
For these reasons, macro -invertebrate assessments are not recommended to monitor
potential impacts from potential pyrite oxidation at Cedar Cliff.
Unlike biological assessments, water quality measurements specifically designed to
detect any chemical alterations have the advantage of:
• Direct correlation to pyrite oxidation
• Relatively rapid analysis of data
• Trends are readily assessed
• Various oxidation and acidification pathways are directly elucidated
• Treatment options (if necessary) may be evaluated and tested during the
excavation process rather than relying on long-term mitigation
Each water sample would measure the reactants and products of the pyrite oxidation
reactions. These analyses will be used to document the pH and pyrite oxidation
products in the lake, area leachates, and de -nitrification prior to and during the
construction project.
In addition to periodic water sampling, continual recording of conductivity would provide
a record of overall ionic change in the water. If oxidation products (ions) increase, the
very low conductivity of the Cedar Cliff water should reflect an increase in the ionic
strength and provide a record of the degree of change (if any).
Page 5 of 8
F-6

Proposed Duke Energy Monitoring Plan
Chemical Basis for Water Quality Monitoring
Major pH Buffering in Surface Water (Alkalinity): (Stumm and Morgan, 1981)
H20<=> H+ + OH -
0O2+ H20<=> H2CO3 <=> H+ + HCO3'- <=> H+ +CO3 2
Chemistry of Pyrite Oxidation (Stumm and Morgan, 1981)
Pyrrhotite reacts with oxygen and water to produce reduced iron and sulfuric acid
Fe(1-x)S + (2-0.5x)02+ xH20=> (1-x)Fe2+ +SO4 2- + 2xH+
Pyrite reacts with oxygen and water to produce reduced iron and sulfuric acid
2FeS2 (s) + 702 + 2H2O => 2Fe2+ + 4SO42- + 4H+ [2FeSO4 + 2H2SO4]
Reduced ferrous iron reacts with oxygen and acid to produce Ferric iron
(rate limiting except if biologically catalyzed)
Fee+ + 1/402 + H+ => Fe 3+ + 1/2H20
Ferric Iron reacts with water to form iron hydroxide (yellow -red precipitate) and acid
Fe3+ + 3H2O => Fe(OH)3 (s) + 3H+
Excess ferric iron reacts with pyrite and water to form ferrous iron and sulfuric acid
FeS2 (s) +14Fe3+ + 8H2O => 15Fe2+ + 2SO42- + 16H+
Table 2. Proposed Chemical Analysis of Water Samples Pending Detailed Review of
Procedures to Achieve Low Limits of Detection
Parameter
Chemical
Tentative Analytical Method
Field Analysis Lab Analysis
Symbol
Whole Water Sample
Alkalinity
HCO3'- C032-
n/a-
Titration (0.025N HCI),
Inflection end-point
Total Iron
Fe
n/a--
Digestion, ICP
Raw Water, ICP
Aluminum
Al
n/a-
Raw Water, ICP
Manganese
Mn
n/a-
Raw Water, ICP
Calcium
Cat+
n/a-
Raw Water, ICP
pH
H+
Low conductivity
- n/a-
electrodes
Turbidity
n/a
Hach 2100Q Portable
n/a-
Turbidimeter
Ferrous Iron
Feel
1, 10 Phenanthroline
n/a-
colorimetric
Iron Hydroxide
Fe(OH)3
absorbance
n/a-
Field Filtered Water Sample
Nitrate -Nitrite
NO3'—NO21-
n/a-
Colorimetric
Sulfate
SO42-
n/a-
Low level
ion chromatography
Page 6 of 8
F-7

Proposed Duke Energy Monitoring Plan
Water Quality Monitoring Program
The water quality monitoring program is divided into two phases, namely the reservoir
sampling and the spill channel sampling. The reservoir sampling is designed to evaluate
the slower pyrite oxidation rates due to lower oxygen concentrations associated with the
large particle spoil on the bottom of the lake and the suspension of small particles
washed off the larger rocks as they are put in the lake. The spill channel sampling is
designed to evaluate the expected higher oxidation rates due to the high oxygen content
of the atmosphere and the higher surface to volume ratios of the fine particles in the
excavated area. These fine particles would be suspended and transported down the
auxiliary spill channel during rain events.
Cedar Cliff Reservoir Samolin
Monthly 1 -meter profiles of Temperature, Dissolved Oxygen, Conductivity, pH, and
turbidity will be collected with a Hydrolab sonde fitted with a low ionic strength pH
reference electrode. The 1 -meter profiles would be taken in the reservoir at the deepest
point in the vicinity of the Cedar Cliff hydro intake (see Figure 2) and at the deepest
point, approximately 2000 feet up -stream of the in -lake spoil footprints. Water samples
(Table 2) would be taken one meter above the lake bottom and one meter from the
surface. An additional water sample would be taken from a depth corresponding to
either abnormally high turbidity or abnormally low pH values in the water column.
Additional monthly water samples would be taken in the immediate tailrace of Cedar Cliff
Hydro and, as recommended by the USACE, just upstream of the East Fork/West Fork
confluence. A recording Hobo© fresh water conductivity data logger will be placed in the
Cedar Cliff Tailrace for the duration of the project.
Cedar Cliff Spill Channel Sampling
Since the spill channel is normally dry, but does serve as a conduit for water runoff
during rain events, the water sampling has to be conducted while the channel has runoff
water in it. Therefore, the water samples would be taken during runoff events of 1/2 inch
of rain or more per 24 -hours (Figure 1). A continuous recording water level sensor and
a recording conductivity sensor will be placed in the auxiliary spill channel upstream of
the sediment berm location prior to excavation'. The data from a recording rain gage
located on Cedar Cliff dam will be correlated with the continuous water level data from
the auxiliary spill channel. After the sediment berm is installed, a second set of water
level and conductivity sensors will be added downstream of the berm. The data will
document runoff events with the associated ionic strength throughout the project.
Data Review and Reporting Requirements
Reservoir, tailrace, and spill channel sampling activities began in July 2018 to establish
pre -construction conditions. Sampling will continue throughout the duration of the
project, which is anticipated to be completed by March 2021. Duke Energy will consult
with applicable state and federal regulatory agencies to determine if potential
remediation measures should be implemented based on water quality monitoring results
during construction.
' The sediment berm will be constructed immediately prior to excavation and will not be in-place during
the pre -construction phase.
Page 7 of 8
F-8

Proposed Duke Energy Monitoring Plan
References
Bosch, J. and R. U. Meckenstock. 2012. Rates and potential mechanism of anaerobic
nitrate -dependent microbial pyrite oxidation. Biochemical Society Transactions
Volume 40, part 6.
DeNicola, D.M. and M.G. Stapleton. 2016. Using Macroin vertebrates to assess
ecological integrity of streams remediated for acid mine drainage. Restoration
Ecology 24:5, 656-667.
Gray, N.F.and E.Delaney. 2008. Comparison of benthic macroin vertebrate indices for
the assessment of the impact of acid mine drainage on an Irish river below an
abandoned Cu -S mine. Environ Pollut. 155:1, 31-40.
He, F., W.Jiang, T.Tang and Q.Cai. 2015. Assessing impact of acid mine drainage on
benthic macroinvertebrates: can functional diversity metrics be used as
indicators?. Journal of Freshwater Ecology, 30:4, 513-524.
HDR. 2017. Geological and Geotechnical Subsurface Investigation, East Fork Hydroelectric
Project and Cedar Cliff Development (FERC No. 2698). Tuckasegee, North
Carolina, Report for Duke Energy of the Carolinas, LLC.
HDR. 2018a. Cedar Cliff Rock Spoil Evaluation. East Fork Hydroelectric Project
and Cedar Cliff Development (FERC No. 2698) Tuckasegee, North Carolina
HDR. 2018b. Cedar Cliff Hydroelectric Development Auxiliary Spillway Upgrade Project
Status Update and Permitting Process. Power Point Presentation for Agency
Briefing January 18, 2018
Nantahala Power and Light. 2000. FERC Relicensing First Stage Consultation Package.
East Fork Hydroelectric Project, FERC Project No. 2608 -NC
North Carolina Division of Water Quality. 2011. Basin -wide Assessment Report Little
Tennessee River Basin. Water Quality Section, Division of Water Quality, North
Carolina Department of Environment and Natural Resources. Raleigh, NC.
Pugh, C.E., L.R. Hossner, and J.B. Dixon. 1984. Oxidation rate of iron sulfides as affected by
surface area, morphology, oxygen concentration, and autotrophic bacteria. Soil
Science. 137:5, pp. 309-314.
Stumm, W. and J.J. Morgan. 1981. Aquatic Chemistry. John Wiley & Sons, Inc.,New York,
NY, 780p.
Svitok, M., M. Novikmec, P. Bitusik, B.Masa, J. Obona, M.Ocadlik 5 and E.Michalkova.
2014. Benthic Communities of Low -Order Streams Affected by Acid Mine
Drainages: A Case Study from Central Europe. Water 6,1312-1338.
Page 8 of 8
F-9

Environmental Report
Cedar Cliff Auxiliary Spillway Upgrade
Annp-nriiy ('-,
May 2019 1 G-1

Kulpa, Sarah
From: Tompkins, Bryan <[e-mail]>
Sent: Thursday, September 6, 2018 9:48 AM
To: Kulpa, Sarah
Subject: Re: [EXTERNAL] Duke Energy — Cedar Cliff Development Auxiliary Spillway Upgrade,
Updated Drawdown Plan and Draft Environmental Report to FERC
Good morning Sarah. I have reviewed the information and project plans included in your August 7, 2018 email
for the Cedar Cliff Auxiliary Spillway Upgrade project proposed by Duke Energy. The USFWS does not have
any additional comments or recommendations to provide at this time. I appreciate the opportunity to review the
information that you presented. If you have questions or need additional information from me, please do not
hesitate to contact me.
Thanks,
Bryan Tompkins
US Fish and Wildlife Service
160 Zillicoa Street
Asheville, North Carolina 28801
828/258-3939 ext.240 (office)
828/450-7586 (cell)
NOTE: This email correspondence and any attachments to and from this sender is subject to the Freedom of Information Act (FOIA) and
may be disclosed to third parties.
On Tue, Aug 7, 2018 at 2:01 PM, Kulpa, Sarah <Sarah.Kulpa(a�hdrinc.com> wrote:
Thanks, Bryan.
Have a good rest of the week -
Sarah Kulpa
D 704.248.3620 M 315.415.8703
hdrinc.com/follow-us
From: Tompkins, Bryan [mailto:bryan [e-mail]]
Sent: Tuesday, August 7, 2018 1:58 PM
To: Kulpa, Sarah <[e-mail]>
Subject: Re: [EXTERNAL] Duke Energy — Cedar Cliff Development Auxiliary Spillway Upgrade, Updated Drawdown Plan
and Draft Environmental Report to FERC
G-2

Thanks Sarah. I received it.
Bryan Tompkins
US Fish and Wildlife Service
160 Zillicoa Street
Asheville, North Carolina 28801
828/258-3939 ext.240 (office)
828/450-7586 (cell)
NOTE: This email correspondence and any attachments to and from this sender is subject to the Freedom of Information Act (FOIA)
and may be disclosed to third parties.
On Tue, Aug 7, 2018 at 12:50 PM, Kulpa, Sarah <Sarah.Kulpa(a�hdrinc.com> wrote:
Good Afternoon:
On behalf of Steve Johnson of Duke Energy, attached for your review and comment please find a draft Environmental
Report to FERC for the upcoming scheduled auxiliary spillway upgrade at the Cedar Cliff Development of the East Fork
Hydroelectric Project (Tuckasegee River, Jackson County, NC). The report summarizes consultation, permits and
approvals to date for this project and is intended to facilitate FERC environmental staff's review of the proposed
modifications to the Cedar Cliff Development, as well as Duke Energy's request for approval for a temporary license
variance for the Cedar Cliff Lake drawdown scheduled for 2019-2020.
Please note that Duke Energy previously consulted with your organizations regarding the Cedar Cliff Lake Drawdown
Plan, which is included as Appendix E of the attached draft Environmental Report. The Drawdown Plan has been
updated to reflect the current schedule, as well as to address and incorporate comments received by Duke Energy in
early 2017.
Duke Energy plans to file the Environmental Report with FERC in early fall and respectfully requests submittal of any
comments on the enclosed within 30 days of the date of this transmittal. Should you have any questions or need any
additional information, please contact Steve Johnson. Due to the large file size of the attachment (13 MB), please reply
to confirm you received this email and the attachment.
On behalf of Duke Energy, thank you for your participation in this process and attention to this project.
G-3

Sarah Kulpa
Senior Regulatory Specialist, Hydropower Services
HDR
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
D 704.248.3620 M 315.415.8703
[e-mail]
hdrinc.com/follow-us
G-4

Kulpa, Sarah
From: Tarver, Fred <[e-mail]>
Sent: Wednesday, September 5, 2018 4:31 PM
To: Kulpa, Sarah; Barnett, Kevin; Goudreau, Chris J.; [e-mail]
Cc: Steve [e-mail]; Jeff [e-mail];
[e-mail]; [e-mail]; lynne.dunn@duke-
energy.com; Banta, Tim; Mularski, Eric
Subject: RE: [External] Duke Energy — Cedar Cliff Development Auxiliary Spillway Upgrade,
Updated Drawdown Plan and Draft Environmental Report to FERC
Sarah et al.,
I've reviewed the document you distributed on 8.7.2018 regarding the Cedar Cliff Development Auxiliary Spillway
Upgrade and have no additional comments at this time.
Thanks,
Fred
Fred R Tarver III
Environmental Flows Program Consultant
Water Planning Section - Basin Plannning Branch
Department of Environmental Quality
919-707-9029 office
[e-mail]
Division of Water Resources
1611 Mail Service Center
Raleigh NC 27699-1611
Email correspondence to & from this address is subject to the N.C. Public Records Law & may be disclosed to third
parties!
From: Kulpa, Sarah [mailto:[e-mail]]
Sent: Tuesday, August 07, 2018 12:51 PM
To: Barnett, Kevin <[e-mail]>; Goudreau, Chris J. <[e-mail]>; Tarver, Fred
<[e-mail]>; [e-mail]
Cc: [e-mail]; Jeff [e-mail]; [e-mail];
[e-mail]; [e-mail]; Banta, Tim <[e-mail]>; Mularski, Eric
<[e-mail]>
Subject: [External] Duke Energy — Cedar Cliff Development Auxiliary Spillway Upgrade, Updated Drawdown Plan and
Draft Environmental Report to FERC
Report Spam.
Good Afternoon:
On behalf of Steve Johnson of Duke Energy, attached for your review and comment please find a draft Environmental
Report to FERC for the upcoming scheduled auxiliary spillway upgrade at the Cedar Cliff Development of the East Fork
G-5

Hydroelectric Project (Tuckasegee River, Jackson County, NC). The report summarizes consultation, permits and
approvals to date for this project and is intended to facilitate FERC environmental staff's review of the proposed
modifications to the Cedar Cliff Development, as well as Duke Energy's request for approval for a temporary license
variance for the Cedar Cliff Lake drawdown scheduled for 2019-2020.
Please note that Duke Energy previously consulted with your organizations regarding the Cedar Cliff Lake Drawdown
Plan, which is included as Appendix E of the attached draft Environmental Report. The Drawdown Plan has been updated
to reflect the current schedule, as well as to address and incorporate comments received by Duke Energy in early 2017.
Duke Energy plans to file the Environmental Report with FERC in early fall and respectfully requests submittal of any
comments on the enclosed within 30 days of the date of this transmittal. Should you have any questions or need any
additional information, please contact Steve Johnson. Due to the large file size of the attachment (13 MB), please reply to
confirm you received this email and the attachment.
On behalf of Duke Energy, thank you for your participation in this process and attention to this project.
Sarah Kulpa
Senior Regulatory Specialist, Hydropower Services
HDR
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
D 704.248.3620 M 315.415.8703
[e-mail]
hdrinc.com/follow-us
G-6

Kulpa, Sarah
From: Goudreau, Chris J. <[e-mail]>
Sent: Tuesday, August 14, 2018 8:46 AM
To: Kulpa, Sarah; Barnett, Kevin; Tarver, Fred; [e-mail]
Cc: [e-mail]
Subject: RE: [External] Duke Energy — Cedar Cliff Development Auxiliary Spillway Upgrade,
Updated Drawdown Plan and Draft Environmental Report to FERC
Follow Up Flag: Follow up
Flag Status: Flagged
Sarah,
NCWRC staff have reviewed the document and have no further comment on the environmental report.
Chris Goudreau
Hydropower & Special Projects Coordinator
Habitat Conservation Division
NC Wildlife Resources Commission
645 Fish Hatchery Road
Marion, NC 28752
office: 828-803-6045
mobile: [phone]
chris.aoudreauancwildlife.ora
ncwildlife.org
a1] 10 El
From: Kulpa, Sarah <[e-mail]>
Sent: Tuesday, August 07, 2018 12:51 PM
To: Barnett, Kevin <[e-mail]>; Goudreau, Chris J. <[e-mail]>; Tarver, Fred
<[e-mail]>; [e-mail]
Cc: [e-mail]; Jeff [e-mail]; [e-mail];
[e-mail]; [e-mail]; Banta, Tim <[e-mail]>; Mularski, Eric
<[e-mail]>
Subject: [External] Duke Energy — Cedar Cliff Development Auxiliary Spillway Upgrade, Updated Drawdown Plan and
Draft Environmental Report to FERC
Good Afternoon:
On behalf of Steve Johnson of Duke Energy, attached for your review and comment please find a draft Environmental
Report to FERC for the upcoming scheduled auxiliary spillway upgrade at the Cedar Cliff Development of the East Fork
Hydroelectric Project (Tuckasegee River, Jackson County, NC). The report summarizes consultation, permits and
approvals to date for this project and is intended to facilitate FERC environmental staff's review of the proposed
G-7

modifications to the Cedar Cliff Development, as well as Duke Energy's request for approval for a temporary license
variance for the Cedar Cliff Lake drawdown scheduled for 2019-2020.
Please note that Duke Energy previously consulted with your organizations regarding the Cedar Cliff Lake Drawdown
Plan, which is included as Appendix E of the attached draft Environmental Report. The Drawdown Plan has been updated
to reflect the current schedule, as well as to address and incorporate comments received by Duke Energy in early 2017.
Duke Energy plans to file the Environmental Report with FERC in early fall and respectfully requests submittal of any
comments on the enclosed within 30 days of the date of this transmittal. Should you have any questions or need any
additional information, please contact Steve Johnson. Due to the large file size of the attachment (13 MB), please reply to
confirm you received this email and the attachment.
On behalf of Duke Energy, thank you for your participation in this process and attention to this project.
Sarah Kulpa
Senior Regulatory Specialist, Hydropower Services
HDR
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
D 704.248.3620 M 315.415.8703
[e-mail]
hdrinc.com/follow-us
Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be disclosed to third parties.
G-8

Yayac, Maggie
From: Kulpa, Sarah
Sent: Tuesday, August 7, 2018 12:50 PM
To: '[e-mail]'; '[e-mail]'; '[e-mail]';
'[e-mail]'
Cc: steve [e-mail]'; '[e-mail]';
'[e-mail]'; '[e-mail]';
'[e-mail]'; Banta, Tim; Mularski, Eric
Subject: Duke Energy — Cedar Cliff Development Auxiliary Spillway Upgrade, Updated
Drawdown Plan and Draft Environmental Report to FERC
Attachments: Cedar Cliff Environmental Repo rt_Draft_08072018.pdf
Good Afternoon:
On behalf of Steve Johnson of Duke Energy, attached for your review and comment please find a draft Environmental
Report to FERC for the upcoming scheduled auxiliary spillway upgrade at the Cedar Cliff Development of the East Fork
Hydroelectric Project (Tuckasegee River, Jackson County, NC). The report summarizes consultation, permits and
approvals to date for this project and is intended to facilitate FERC environmental staff's review of the proposed
modifications to the Cedar Cliff Development, as well as Duke Energy's request for approval for a temporary license
variance for the Cedar Cliff Lake drawdown scheduled for 2019-2020.
Please note that Duke Energy previously consulted with your organizations regarding the Cedar Cliff Lake Drawdown
Plan, which is included as Appendix E of the attached draft Environmental Report. The Drawdown Plan has been updated
to reflect the current schedule, as well as to address and incorporate comments received by Duke Energy in early 2017.
Duke Energy plans to file the Environmental Report with FERC in early fall and respectfully requests submittal of any
comments on the enclosed within 30 days of the date of this transmittal. Should you have any questions or need any
additional information, please contact Steve Johnson. Due to the large file size of the attachment (13 MB), please reply to
confirm you received this email and the attachment.
On behalf of Duke Energy, thank you for your participation in this process and attention to this project.
Sarah Kulpa
Senior Regulatory Specialist, Hydropower Services
HDR
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
D 704.248.3620 M 315.415.8703
[e-mail]
hdrinc.com/follow-us
G-9

(> DUKE
ENERGY
August 7, 2018
Via electronic mail
Mr. Kevin Barnett
NC Division of Water Resources
2090 U.S. 70 Highway
Swannanoa, NC 28778
Mr. Fred Tarver
NC Division of Water Resources
1611 Mail Service Center
WATER STRATEGY, HYDRO
LICENSING AND LAKE SERVICES
Duke Energy Corporation
526 South Church Street
Charlotte, NC 28202
Mr. Chris Goudreau
NC Wildlife Resources Commission
645 Fish Hatchery Road
Marion, NC 28752
Mr. Bryan Tompkins
Asheville Field Office
U.S. Fish and Wildlife Service
Raleigh, NC 27699-1611 160 Zillicoa Street
Asheville, North Carolina 28801
Subject: East Fork Hydroelectric Project (FERC No. 2698)
Cedar Cliff Hydroelectric Development Auxiliary Spillway Upgrade
Updated Drawdown Plan and Draft Environmental Report to FERC
Dear Messrs. Barnett, Tarver, Goudreau and Tompkins:
Duke Energy Carolinas, LLC (Duke Energy) herein provides the enclosed information for your review and
comment on the upcoming scheduled auxiliary spillway upgrade at the Cedar Cliff Hydroelectric
Development of the East Fork Hydroelectric Project (Project). The Cedar Cliff Development is located on
the East Fork of the Tuckasegee River in Jackson County, North Carolina. The Cedar Cliff Development is
the most downstream of the three developments in the Project. The Bear Creek Development is
immediately upstream of Cedar Cliff and the Tennessee Creek Development is immediately upstream of
the Bear Creek Development.
As you have already been made aware, the proposed drawdown is necessary to complete modifications
of the Cedar Cliff Dam and associated auxiliary spillway as required by the Federal Energy Regulatory
Commission (FERC) Atlanta Regional Office (ARO) to satisfy safe passage of the Inflow Design Flood (IDF),
which is defined as the Probable Maximum Flood (PMF), without overtopping Cedar Cliff Dam. In order
to complete the aforementioned work, Cedar Cliff Lake will need to be drawn down approximately 30
feet for the duration of construction (anticipated to be approximately 17 months), planned for July 2019
through December 2020.
Duke Energy has previously consulted with your respective agencies regarding potential impacts of the
planned construction and reservoir drawdown activities on existing resources, through the following
primary activities:
• Application process for Section 404/Section 10 permit from the U.S. Army Corps of Engineers
and a Section 401 Water Quality Certification from the North Carolina Department of
Environmental Quality, Division of Water Resources (NCDWR), including informal consultation
G-10

East Fork Hydroelectric Project (P-2698)
Cedar Cliff Hydroelectric Development Auxiliary Spillway Upgrade
Updated Drawdown Plan and Draft Environmental Report to FERC
August 7, 2018
Page 2
with the U.S. Fish and Wildlife Service (USFWS) pursuant to Section 7 of the Endangered Species
Act.
• Development of a drawdown plan for Cedar Cliff Lake (see discussion below).
An initial draft Cedar Cliff Lake Drawdown Plan was distributed by Duke Energy to this group for review
on December 15, 2016. Comments were subsequently received from NCDWR, USFWS, and the North
Carolina Wildlife Resources Commission (NCWRC). The drawdown plan has been revised by Duke Energy
to (1) incorporate and address comments from agency review, (2) incorporate relevant measures from
the comprehensive drawdown plan developed for the East Fork Hydroelectric Project for reservoir
drawdowns scheduled for late 2018, and (3) reflect the updated schedule for construction of the
auxiliary spillway upgrade.
The updated Cedar Cliff Lake Drawdown Plan is now being made part of a larger filing to FERC,
scheduled for early this fall. This filing will include Duke Energy's request for approval for a temporary
variance from License Article 401 Reservoir Level Management for the Cedar Cliff Lake drawdown
necessary to complete the auxiliary spillway upgrade. The filing will also include an Environmental
Report to facilitate FERC staff's (1) review of environmental effects associated with Duke Energy's plans
for the auxiliary spillway modifications; (2) evaluation of compliance with requirements of the existing
FERC License and associated plans and water quality certification, as well as the Tuckasegee Cooperative
Stakeholder Team Settlement Agreement, as applicable, throughout the construction period; and (3)
determination of the appropriate process for amending the East Fork Project's license or license exhibits
to reflect the modifications to Cedar Cliff Dam.
Duke Energy is now distributing a draft copy of the Environmental Report, including the updated Cedar
Cliff Lake Drawdown Plan as described above, for a courtesy agency review. Please note that the
Environmental Report is a "repackaging" of permitting and consultation activities to date and does not
include any new substantive information relevant to potential impacts or proposed protection,
mitigation, or enhancement measures.
Duke Energy respectfully requests submittal of any comments on the enclosed information within 30
days of the date of this letter. Subsequently, Duke Energy will address any comments received and
submit the final Environmental Report for the Cedar Cliff Auxiliary Spillway Upgrade, including the Cedar
Cliff Lake Drawdown Plan, to FERC, along with a request for approval of the temporary reservoir level
variance in 2019-2020.
If you have any questions about the enclosed information, please contact me at [phone] or
[e-mail].
Sincerely,
xp� — - —
Steven R. Johnson
Water Strategy & Hydro Licensing
Duke Energy Carolinas, LLC
G-11

East Fork Hydroelectric Project (P-2698)
Cedar Cliff Hydroelectric Development Auxiliary Spillway Upgrade
Updated Drawdown Plan and Draft Environmental Report to FERC
August 7, 2018
Page 3
Enclosure: Draft Cedar Cliff Environmental Report
cc w/enclosure: Jeff Lineberger, Duke Energy
Phil Fragapane, Duke Energy
Brad Keaton, Duke Energy
Lynne Dunn, Duke Energy
Tim Banta, HDR
Eric Mularski, HDR
Sarah Kulpa, HDR
G-12