20160742 Ver 1_Public Notice_20160812

MUS Army Corps PUBLIC NOTICE
Of Engineers
Wilmington District
Issue Date: August 12, 2016
Comment Deadline: September 12, 2016
Corps Action ID Number: SAW -2015-02543
The Wilmington District, Corps of Engineers (Corps or USACE) received an application from
Mr. Jonathan Ray of Duke Energy Carolinas, LLC (Duke Energy) seeking Department of the
Army authorization for 110 linear feet (If) of temporary stream impacts (stream crossing), 51.3
acres of temporary open water impacts (barge loading/staging area and impoundment
dewatering), and 9.61 acres of permanent open water impacts (submerged weir and rock spoil
disposal), associated with the Cedar Cliff Development Auxiliary Spillway Upgrade Project in
Tuckasegee, Jackson County, North Carolina.
Specific plans and location information are described below and shown on the attached plans.
This Public Notice and all attached plans are also available on the Wilmington District Web Site
at http://www.saw.usace.army.mil/Missions/Re _ ug latoo PermitPro rg am.aspx
Applicant:
AGENT (if applicable)
Authority
Mr. Jonathan Ray
Duke Energy Carolinas, LLC
400 S. Church Street
Charlotte, North Carolian 28202
Mr. Eric Mularski
HDR Engineering, Inc.
440 S. Church Street, Suite 900
Charlotte, North Caroina 28202
The Corps evaluates this application and decides whether to issue, conditionally issue, or deny
the proposed work pursuant to applicable procedures of the following Statutory Authorities:
® Section 404 of the Clean Water Act (33 U.S.C. 1344)
❑ Section 10 of the Rivers and Harbors Act of 1899 (33 U.S.C. 403)
❑ Section 103 of the Marine Protection, Research and Sanctuaries Act of 1972 (33
U.S.C. 1413)

Location
Directions to Site: From NC Highway 107 in Tuckasegee, turn east onto NC Highway 281
(Canada Road). Travel approximately 1.5 miles and turn right onto the Duke Energy Cedar Cliff
Facility access road and follow this road to the Cedar Cliff Lake dam and spillway.
Project Area (acres): 121
Nearest Town: Tuckasegee
Nearest Waterway: East Fork Tuckasegee River
River Basin: Tuckasegee (06010203)
Latitude and Longitude: 35.25363 N, 83.09925 W
Existing Site Conditions
The East Fork Hydroelectric Project (East Fork Project) began commercial operation in 1952 and
is currently owned and operated by Duke Energy. The East Fork Project consists of three
developments, which are (from upstream to downstream) the Tennessee Creek Development,
Bear Creek Development, and Cedar Cliff Development. The Federal Energy Regulatory
Commission (FERC) issued a new license for the East Fork Project on May 4, 2011. The Project
is currently classified by FERC as having "High" hazard potential based on the probable loss of
human life and potential for economic losses, environmental damage, and/or disruption to
lifelines caused by failure or mis-operation of a dam or appurtenances.
The Cedar Cliff Development is located on the East Fork of the Tuckasegee River (East Fork) in
Jackson County, North Carolina, approximately 6 miles southeast of the town of Cullowhee
(Figure 1). Constructed between 1950 and 1952, the development consists of a 590 -foot -long,
173 -foot -high, earthen impervious core and rock fill embankment with nominal upstream and
downstream slopes of 1.3 Horizontal (H):1 Vertical (V), and a crest elevation of 2,343.5 feet
above mean sea level (ft msl). The dam impounds Cedar Cliff Lake, which has a surface area of
121 acres and total reservoir volume of 6,200 acre-feet at a normal maximum pool at full pond
elevation of 2,330 ft msl. The dam crest is 25 feet (ft) wide and includes a concrete parapet wall
along its entire length that varies in height from 1.5 ft to 3.7 ft. A principal spillway is located at
the right abutment and includes a float -controlled 25 ft by 25 ft Tainter gate with a sill elevation
of 2,305 ft msl.
An auxiliary spillway is located at the left abutment, which 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
auxiliary spillway's crest elevation ranges from 2,331 to 2,334 ft msl.
Water is conveyed to the Cedar Cliff powerhouse 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 down a 1,138 ft long tunnel with a 12 ft diameter concrete -lined
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section, a 13 ft by 15 ft unlined section, and a 10 ft diameter steel -lined section. The tunnel
adjoins an 8 ft diameter steel penstock at the powerhouse, which contains one vertical Francis -
type generating unit with a nameplate -rated capacity of 9,400 horsepower at best gate efficiency
gate position under 170 ft net head and discharge capacity of 555 cubic feet per second (cfs).
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
generator unit produces approximately 400 kilowatts (kW) based on 35 cfs and 157 ft net head.
Water inflow to the continuous minimum flow unit is conveyed from the 8 ft penstock serving
the main powerhouse generating unit.
The Cedar Cliff Development includes a bypass reach that extends approximately 0.5 mile from
the base of the dam to the powerhouse, where it becomes the East Fork.
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 the Jackson County consists of high, intermediate, and low mountains; floodplains; and low
stream terraces (Figure 2). The East Fork 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 (Figure 3).
The Cedar Cliff Development is part of the Tennessee River system and lies within the
Tuckasegee River watershed (HUC 06010203), which is a sub -basin of the Little Tennessee
River. The total drainage area of the Tennessee River is 42,000 square miles, of which the Little
Tennessee River contributes 2,627 square miles, including more than 655 square miles from the
Tuckasegee River. This sub -basin contains some of the most pristine, high-quality waters in the
state and supports numerous trout streams. The East Fork (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 Jr) surface water, as designated by the North
Carolina Department of Environmental Quality — Division of Water Resources (NCDWR).
Habitat for aquatic species within the East Fork varies along its length due to impoundments,
diversions, and other anthropogenic influences. 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.
Riverine habitat along the East Fork bypass reach 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.
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Cedar Cliff Lake and the East Fork bypass reach exhibit a wide variety of warm water and cool
water fish species. Fish survey data for Cedar Cliff Lake collected in the 1960s and 1996 by the
North Carolina Wildlife Resources Commission (NCWRC) identified 18 species, many of which
are game species such as smallmouth and largemouth bass (most common), and rainbow, brown,
and brook trout.
In 2015, a botanical survey was conducted by HDR biologists within the project 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 project 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, black locust
(Robinia pseudoacacia), cucumber tree (Magnolia acuminate), green ash (Fraxinus
pennsylvanica), mockemut 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 falix femina), sensitive fern (Onoclea 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).
Mammal species that commonly occur in these habitats include eastern cottontail (Sylvilagus
floridanus)*; gray squirrel (Sciurus carolinensis)*; eastern chipmunk (Tamis striatus), southern
flying squirrel (Glaucomys volans), various vole, rat, and mice species; raccoon (Procyon
lotor)*; Virginia opossum (Didelphis virginiana)*; white-tailed deer (Odocoileus virginiana)*,
and black bear (Ursus americanus). Bird species that commonly use these habitats include indigo
bunting (Passerina 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 caroling caroling), 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.).
HDR obtained and reviewed a list of federally protected species for Jackson County, North
Carolina from the U.S. Fish and Wildlife Service (USFWS) website, which was last updated on
July 24, 2015. The following table provides a summary of these species.
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 co/oratus
E
Current
Indiana bat
Myotis sodalis
E
Current
Northern long-eared bat
Myotis septentrionalis
T
Current
Invertebrates
Appalachian elktoe
Alasmidonta raveneliana
E
Current
Spruce -fir moss spider
Microhexura montivaga
E
Current
Vascular Plants
Small whorled pogonia
Isotria medeo/oides
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 also conducted an on-site survey to identify potential habitat and possible individuals of
federally protected species listed in the above table. 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
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protected species within the Study 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 (ESA) 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. 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.
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.
The project will not affect the remaining protected species listed for Jackson County. HDR has
submitted correspondence to the USFWS and NCWRC regarding potential issues with respect to
endangered species, migratory birds, or other resources from the proposed construction activities.
KIM

As of the date of this application submittal, no response has been received. Once received, the
response will be promptly forwarded to the USACE.
HDR reviewed the National Park Service National Register of Historic Places (NRHP) GIS
Public Dataset and the North Carolina Historic Preservation Office (NCHPO) HPOWEB GIS
Web Service. The East Fork Hydroelectric Plant (Cedar Cliff Development) was identified in the
HPOWEB GIS database. Notes indicated that previous cultural resources surveys (ER 02-8205;
Multi Co Rpt #475; ER 06-3132) have been conducted, but no historical or archaeological
features were identified.
In association with the 2004 East Fork Project FERC license application, Duke Energy
commissioned an archeological survey and National Register evaluation of East Fork Project
facilities. An archaeological survey was conducted in portions of the East Fork Project identified
by the NCHPO, Forest Service, and Eastern Band of Cherokee Indians (EBCI) 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
vertical drawdown. A survey of Cedar Cliff Lake was not performed as part of the evaluation.
The Phase I surveys in consultation with the NCHPO concluded that project facilities at the
Cedar Cliff Development are 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 Alcoa to meet the growing need of aluminum during the Korean Conflict and the Cold
War's operations in eastern Tennessee.
Duke Energy has developed a Historical Properties Management Plan (HPMP) in consultation
with the NCHPO, EBCI, and the Forest Service to ensure that any adverse effects on historic
properties from the project construction will be avoided, minimized, and mitigated. The project
will not affect the original Cedar Cliff powerhouse structure. Cedar Cliff Lake may have
submerged archaeological sites. Procedures detailed in the HPMP will be implemented since the
reservoir will be drawn down more than 5 vertical feet.
HDR in collaboration with Duke Energy's Cultural/Historic Resources Coordinator will submit
correspondence to the NCHPO and EBCI Tribal Preservation Officer regarding the need to
conduct archaeological surveys of the exposed areas during the reservoir drawdown. As of the
date of this application submittal, no response has been received. Once a response is received, it
will be promptly forwarded to the USACE.
In September 2015, HDR biologists surveyed the project area and adjacent lands for wetlands
and jurisdictional waters of the U.S. (WoUS) under Section 404 of the Clean Water Act (CWA).
The areas were examined according to the methodology described in the USACE 1987 Wetland
Delineation Manual, USACE Post-Rapanos guidance, USACE Eastern Mountains and Piedmont
Regional Supplement, and NCDWR Methodology for Identification of Intermittent and
Perennial Streams and Their Origins (Version 4.11). On-site reconnaissance activities identified
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the East Fork bypass reach and Cedar Cliff Lake as the only jurisdictional waters located within
the project area. The following table provides a summary of jurisdictional WoUS within the
project area.
Summary of Jurisdictional Waters
Name
Latitude/
Cowardin
Estimated Amount of
Longitude
Class
Aquatic Resource in
Review Area
East Fork Bypass Reach
35.251261
R3RSA/
-2,000 linear feet
-83.100550
R3UBH
Cedar Cliff Lake
35.255780
L1 UBHh
-121 acres
-83.096929
Applicant's Stated Purpose
The basic project purpose of the proposed project is to construct a system to safely pass the
Probable Maximum Flood (PMF), which is defined as the Inflow Design Flood (IDF), without
overtopping the Cedar Cliff dam. FERC requested Duke Energy to develop and implement a
system that addresses the ability of the dam to safely pass all flows up to and including the IDF.
Project Description
The proposed project is to modify the existing Cedar Cliff Dam auxiliary spillway and main dam
toe berm to safely pass the IDF. The Cedar Cliff Development has an existing discharge capacity
of approximately 80,000 cfs at reservoir Elevation 2,043.5 ft msl. This discharge capacity
represents combined discharge from the main generating unit, principal spillway (Tainter gate),
and auxiliary spillway (fuse plugs). The PMF peak inflow is approximately 192,000 cfs, which
was approved by FERC on June 22, 1994. 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, which has a crest elevation of 2,343.5 ft msl. The FERC identified the IDF as
the PMF in correspondence to Duke Energy dated April 24, 2014, 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 of this magnitude.
The project will install a Fusegate control section which will involve complete demolition of the
two existing fuse plug chambers and single concrete splitter wall within the existing auxiliary
spillway. The existing auxiliary spillway channel width at the Fusegate control section would be
widened. Six cast -in-place Hydroplus Fusegates would replace the existing fuse plugs and serve
as a passive semi -labyrinth spillway for inflow greater than 55,000 cfs. The Fusegates would be
placed on a reinforced concrete foundation pad that is approximately 57 ft wide including both
left and right reinforced concrete abutment walls. The crest of the Fusegates would be at normal
pool elevation 2,330 ft msl. The existing PMF wall would be demolished and replaced with a
new PMF wall constructed across the length of the main dam with crest elevation 2,351 ft msl.
The individual Fusegates would be engineered to tip over at various water surface elevations in
excess of 2,346 ft msl (+16 feet above full pond elevation 2,330 ft msl) to safely pass the IDF.
WE

The auxiliary spillway channel width and depth would be expanded to provide sufficient
hydraulic capacity in conjunction with the principal spillway to safely pass the PMF, which is the
defined IDF for Cedar Cliff. Modifications to the existing auxiliary spillway would include
removal of a portion of the existing right fuse plug rock abutment (30 ft), rock cut along the
inner wall (adjacent to the main dam embankment) of the auxiliary spillway, and significant rock
cut depth along the outer wall of the auxiliary spillway. The auxiliary spillway channel control
section would be widened from 200 ft to 250 ft at elevation 2,305 ft msl. Rock cuts along the left
auxiliary spillway channel would vary in depth from 55 ft to 165 ft. The left auxiliary channel
wall would be benched to enhance safety of the work site during construction while preserving
the design base hydraulic capacity. The rock cut excavation for the auxiliary spillway is
approximately 316,600 cubic yards (cyd).
An 11 ft high concrete parapet wall would be constructed along the crest of the dam. The
elevation at the top of the wall would be 2,351 ft msl. Six Fusegates, provided by Hydroplus,
would be placed in the control section of the auxiliary spillway along the axis of the existing fuse
plugs. An approximate 5 ft thick reinforced concrete sill with 4 ft thick reinforced concrete
abutment walls on either side of the spillway would be constructed. The concrete Fusegates
would be cast in place and measure approximately 41.67 ft wide by 25 ft high. The toe blocks for
each gate would be constructed of reinforced concrete. The top of each Fusegate crest would be
at normal pool Elevation 2,330 ft msl.
Toe berm modifications to the main dam would consist of adding up to approximately 25,000
cyd of rock spoil from the auxiliary spillway modification to the downstream face of the rock fill
dam. The proposed toe berm has a crest elevation of 2,215 ft msl (Cedar Cliff Dam crest
elevation at 2,343.5 ft msl) with a slope of 1.3H:1 V. Design modifications include developing a
filter system through the toe berm, limiting the angle of repose of the toe berm slope to match the
main dam angle of repose, limiting the downstream toe extension to the natural alignment of the
principal spillway outflow discharge channel, and relocating the existing Tailwater Alarm
System.
The NWI classifies Cedar Cliff Lake as lacustrine, limnetic, consolidated bottom, permanently
flooded, diked/impounded (LIUBHh). Cedar Cliff Lake is a 121 -acre reservoir with a usable
storage capacity of 465 acre-feet. The reservoir has a maximum depth of 150 ft and mean depth
of 55 ft.
Rock spoil from the auxiliary spillway excavation will be loaded onto a barge and deposited in
Cedar Cliff Lake to eliminate potential impacts to identified jurisdictional waters and intact
terrestrial habitats at alternate rock spoil locations. This activity will result in approximately
316,600 cyd of permanent fill within an approximate 9.6 -acre footprint of the reservoir.
The maximum spoil fill depth is estimated to be 40 ft within the 9.6 -acre surface area footprint.
The nominal crest elevation of the rock spoil within the reservoir is 2,230 ft msl and the rock
spoil volume is equivalent to 3.2 percent of the reservoir volume. The NCWRC will be consulted
to determine placement locations that would serve as fish attractors to benefit fishing in the
reservoir.

Cedar Cliff Lake will be drawn down approximately 30 feet (El 2,330 ft msl) for a duration of 14
to 16 months to facilitate construction of the spillway modifications. As a result, the reservoir at
the Bear Creek Powerhouse, located upstream from the Cedar Cliff Development, will be de -
watered. An approximate 30 ft long by 12 ft wide by 2 ft high submerged weir will be installed
in the natural bed of the reservoir to capture and pool water at the immediate Bear Creek
powerhouse to sustain generation during the reservoir drawdown. Approximately 15.3 cyd of
rock (or other type of fill) will be used to install this permanent submerged weir structure.
Also, an approximate 0.5 -acre laydown area for the rock spoil barge loading zone will be placed
at the upstream approach of the auxiliary spillway below the normal pool elevation during the
drawdown period.
According to the USFWS National Wetlands Inventory (NWI), reaches of the East Fork are
identified as riverine, upper perennial, rocky shore, temporary flooded (R3RSA) and riverine
upper perennial, unconsolidated bottom, permanently flooded (R3UBH). The East Fork reach
located within the project area is generally 20 to 40 ft wide with stream banks heights ranging
from 4 to 10 ft. The riparian buffer is mostly intact with localized areas of scour and stream bank
erosion.
Temporary fill impacts will be associated with placement of a culvert crossing in the East Fork
bypass reach immediately below Cedar Cliff Dam to accommodate equipment during
construction of the toe berm and auxiliary spillway modifications. Three 110 ft long by 12 f6t
diameter corrugated metal pipes (CMP) will be placed in the East Fork bypass reach for this
crossing. The culverts will be removed when construction is completed.
The following table provides a summary of impacts to jurisdictional waters. Refer to the Site
Impact Drawings for additional details.
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Impacts to Jurisdictional Waters Summary
Impact ID
Sheet
Name of
Type of Impact
Impact Area
Number
Water Body
Stream Impacts
S1
Sheet 4
East Fork Bypass
Temporary
110 linear feet
Reach
Fill (Culvert)
TOTAL
110 linear feet
Open Water Impacts
Temporary Fill
owl
Sheet 2
Cedar Cliff Lake
(Barge Loading Staging
0.5 acres
Area)
OW2
Sheet 3
Cedar Cliff Lake
Permanent Fill
9.6 acres
(Rock Spoil)
OW3
Sheet 3
Cedar Cliff Lake
Temporary
50.8 acres
(Dewatering)
OW4
Sheet 6
Cedar Cliff Lake
Permanent Fill
0.01 acres
(Submerged Weir)
TOTAL
60.91 acres
Avoidance and Minimization
The applicant provided the following information in support of efforts to avoid and/or minimize
impacts to the aquatic environment.
Pre -project site planning was conducted to delineate and field -verify jurisdictional WoUS within
the proposed project area. These features were used to select a viable alternative to avoid and
minimize impacts to aquatic resources. The alternative of utilizing the reservoir as a spoil
repository will eliminate potential impacts to identified jurisdictional waters and intact terrestrial
habitats at possible alternate rock spoil locations. The NCWRC and USFWS will be consulted to
determine placement locations that would serve as fish attractors to benefit fishing in the
reservoir.
Project construction will affect water quality and water quantity in Cedar Cliff Lake and the East
Fork. Sediment release to the East Fork bypass reach and Cedar Cliff Lake can adversely affect
aquatic habitats by filling in pools and coarse substrate (i.e., gravel and cobble) habitats. Duke
Energy has developed and will implement an Erosion and Sediment Control Plan. This plan will
be submitted for review and approval by the North Carolina Department of Environmental
Quality's Land Quality Section to prevent sedimentation impacts to water resources. Best
Management Practices (BMP) 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
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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 trees, shrubs, and
herbs.
As described in the previous section, the project will require a 30 -foot drawdown of the reservoir
for a duration of 14 to 16 months. Aquatic habitats within the drawdown zone will be affected
during this period. Wind and wave action against the reservoir shoreline may result in sloughing
of banks and trees becoming unstable during the drawdown. Duke Energy has established
shoreline management guidelines to address shoreline management issues including actions to
repair or prevent damage to the shoreline as a result of erosion.
The reservoir drawdown will also affect recreational access. To the extent practicable, Duke
Energy will schedule the drawdown to minimize effects to the recreation season.
According to the non -capacity license amendment for the East Fork Project (issued February 21,
2012), Duke Energy shall release minimum flows from Cedar Cliff Lake as required by
Condition 6 of the NCDWR's water quality certification. Minimum flow requirements include a
flow of 10 cfs during non -generating hours from December 1 through June 30 and 35 cfs from
July 1 through November 30, each year, from the Cedar Cliff Minimum Flow Powerhouse to the
East Fork (FERC Project No. 2698-033). The reservoir drawdown is not anticipated to affect
minimum flows during project construction activities.
The temporary culverts on the East Fork bypass reach were sized to accommodate the hydraulic
capacity of the channel and promote passage of fish and other aquatic organisms. Historic
operations indicate flow passage is required through the principal spillway during any given 12 -
month time period. During construction, seepage or leakage from the closed spillway gate will be
the primary source of the base flow in the East Fork bypass reach. This will result in minimal
continuous base flow and periods of intermittent flow within the bypass reach. The three 12 ft
diameter culverts were hydraulically designed to pass approximately 5,000 cfs if principal
spillway operation is required during construction which is equivalent to a flood return period of
approximately 50 years. The primary center culvert will be installed in the existing bedrock
stream bed at an elevation to allow localized water flow and movement of aquatic life. The
culverts will be removed when the project is complete and streams banks will be re -graded to
their pre -construction dimensions.
Compensatory Mitigation
The proposed project does involve temporary and permanent impacts to jurisdictional WoUS.
These impacts will not result in a permanent loss of jurisdictional WoUS which would require
compensatory mitigation. The applicant does not offer a compensatory mitigation plan because
there will be no unavoidable functional loss to the aquatic environment within jurisdictional
WoUS. Duke Energy will provide payment to the NCWRC for installation of fish attractors to
promote habitat and enhance sport fishing which will improve the aquatic environment within
jurisdictional WoUS at the project.
-12-

Essential Fish Habitat
Pursuant to the Magnuson -Stevens Fishery Conservation and Management Act, this Public
Notice initiates the Essential Fish Habitat (EFH) consultation requirements. The Corps' initial
determination is that the proposed project would not affect EFH or associated fisheries managed
by the South Atlantic or Mid Atlantic Fishery Management Councils or the National Marine
Fisheries Service.
Cultural Resources
Pursuant to Section 106 of the National Historic Preservation Act of 1966, Appendix C of 33
CFR Part 325, and the 2005 Revised Interim Guidance for Implementing Appendix C, the
District Engineer consulted district files and records and the latest published version of the
National Register of Historic Places and initially determines that:
❑ Should historic properties, or properties eligible for inclusion in the National Register, be
present within the Corps' permit area; the proposed activity requiring the DA permit (the
undertaking) is a type of activity that will have no potential to cause an effect to an
historic properties.
❑ No historic properties, nor properties eligible for inclusion in the National Register, are
present within the Corps' permit area; therefore, there will be no historic properties
affected. The Corps subsequently requests concurrence from the SHPO (or THPO).
❑ Properties ineligible for inclusion in the National Register are present within the Corps'
permit area; there will be no historic properties affected by the proposed work. The
Corps subsequently requests concurrence from the SHPO (or THPO).
® Historic properties, or properties eligible for inclusion in the National Register, are
present within the Corps' permit area; however, the undertaking will have no adverse
effect on these historic properties. The Corps subsequently requests concurrence from
the SHPO (or THPO).
❑ Historic properties, or properties eligible for inclusion in the National Register, are
present within the Corps' permit area; moreover, the undertaking may have an adverse
effect on these historic properties. The Corps subsequently initiates consultation with the
SHPO (or THPO).
❑ The proposed work takes place in an area known to have the potential for the presence of
prehistoric and historic cultural resources; however, the area has not been formally
surveyed for the presence of cultural resources. No sites eligible for inclusion in the
National Register of Historic Places are known to be present in the vicinity of the
proposed work. Additional work may be necessary to identify and assess any historic or
prehistoric resources that may be present.
-13-

Phase I archaeological surveys in consultation with the NCHPO concluded that project facilities
at the Cedar Cliff Development are 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 Alcoa to meet the growing need of aluminum during the Korean Conflict and the Cold
War's operations in eastern Tennessee.
Duke Energy has developed a HPMP in consultation with the NCHPO, EBCI, and the Forest
Service to ensure that any adverse effects on historic properties from the project construction will
be avoided, minimized, and mitigated. The project will not affect the original Cedar Cliff
powerhouse structure. Cedar Cliff Lake may have submerged archaeological sites. Procedures
detailed in the 14PMP will be implemented since the reservoir will be drawn down more than 5
vertical feet.
HDR in collaboration with Duke Energy's Cultural/Historic Resources Coordinator will submit
correspondence to the NCHPO and EBCI Tribal Preservation Officer regarding the need to
conduct archaeological surveys of the exposed areas during the reservoir drawdown. As of the
date of this application submittal, no response has been received. Once a response is received, it
will be promptly forwarded to the USACE.
The District Engineer's final eligibility and effect determination will be based upon coordination
with the SHPO and/or THPO, as appropriate and required, and with full consideration given to
the proposed undertaking's potential direct and indirect effects on historic properties within the
Corps-indentified permit area.
Endangered Species
Pursuant to the Endangered Species Act of 1973, the Corps reviewed the project area, examined
all information provided by the applicant and consulted the latest North Carolina Natural
Heritage Database. Based on available information:
❑ The Corps determines that the proposed project would not affect federally listed
endangered or threatened species or their formally designated critical habitat.
® The Corps determines that the proposed project may affect, but not likely to adversely
affect, federally listed endangered or threatened species or their formally designated
critical habitat. The Corps initiates consultation under Section 7 of the ESA and will not
make a permit decision until the consultation process is complete.
❑ The Corps is not aware of the presence of species listed as threatened or endangered or
their critical habitat formally designated pursuant to the Endangered Species Act of 1973
(ESA) within the project area. The Corps will make a final determination on the effects of
the proposed project upon additional review of the project and completion of any
necessary biological assessment and/or consultation with the U.S. Fish and Wildlife
Service and/or National Marine Fisheries Service.
-14-

The following federally listed threatened species may occur at the project site.
Common Name
Scientific Name
Federal
Designation'
Record
Status2
Indiana bat
Myotis soda/is
E
Current
Northern long-eared bat
Myotis septentrionalis
T
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."
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.
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.
HDR has submitted correspondence to the USFWS and NCWRC regarding potential issues with
respect to endangered species, migratory birds, or other resources from the proposed construction
activities. As of the date of this application submittal, no response has been received. Once
received, the response will be promptly forwarded to the USACE.
-15-

The Corps initiates informal consultation with FWS under Section 7 of the ESA and will not
make a permit decision until the consultation process is complete.
Other Required Authorizations
The Corps forwards this notice and all applicable application materials to the appropriate State
agencies for review.
North Carolina Division of Water Resources (NCDWR): The Corps will generally not make a
final permit decision until the NCDWR issues, denies, or waives the state Certification as
required by Section 401 of the Clean Water Act (PL 92-500). The receipt of the application and
this public notice, combined with the appropriate application fee, at the NCDWR Central Office
in Raleigh constitutes initial receipt of an application for a 401 Certification. A waiver will be
deemed to occur if the NCDWR fails to act on this request for certification within sixty days of
receipt of a complete application. Additional information regarding the 401 Certification may be
reviewed at the NCDWR Central Office, 401 and Buffer Permitting Unit, 512 North Salisbury
Street, Raleigh, North Carolina 27604-2260. All persons desiring to make comments regarding
the application for a 401 Certification should do so, in writing, by September 12, 2016 to:
NCDWR Central Office
Attention: Ms. Karen Higgins, 401 and Buffer Permitting Unit
(USPS mailing address): 1617 Mail Service Center, Raleigh, NC 27699-1617
Or,
(physical address): 512 North Salisbury Street, Raleigh, North Carolina 27604
North Carolina Division of Coastal Management (NCDCM):
❑ The application did not include a certification that the proposed work complies with and
would be conducted in a manner that is consistent with the approved North Carolina
Coastal Zone Management Program. Pursuant to 33 CFR 325.2(b)(2) the Corps cannot
issue a Department of Army (DA) permit for the proposed work until the applicant
submits such a certification to the Corps and the NCDCM, and the NCDCM notifies the
Corps that it concurs with the applicant's consistency certification. As the application
did not include the consistency certification, the Corps will request, upon receipt„
concurrence or objection from the NCDCM.
® Based upon all available information, the Corps determines that this application for a
Department of Army (DA) permit does not involve an activity which would affect the
coastal zone, which is defined by the Coastal Zone Management (CZM) Act (16 U.S.C. §
1453).
-16-

Evaluation
The decision whether to issue a permit will be based on an evaluation of the probable impacts
including cumulative impacts of the proposed activity on the public interest. That decision will
reflect the national concern for both protection and utilization of important resources. The benefit
which reasonably may be expected to accrue from the proposal must be balanced against its
reasonably foreseeable detriments. All factors which may be relevant to the proposal will be
considered including the cumulative effects thereof; among those are conservation, economics,
aesthetics, general environmental concerns, wetlands, historic properties, fish and wildlife
values, flood hazards, flood plain values (in accordance with Executive Order 11988), land use,
navigation, shoreline erosion and accretion, recreation, water supply and conservation, water
quality, energy needs, safety, food and fiber production, mineral needs, considerations of
property ownership, and, in general, the needs and welfare of the people. For activities involving
the discharge of dredged or fill materials in waters of the United States, the evaluation of the
impact of the activity on the public interest will include application of the Environmental
Protection Agency's 404(b)(1) guidelines.
Commenting Information
The Corps of Engineers is soliciting comments from the public; Federal, State and local agencies
and officials, including any consolidated State Viewpoint or written position of the Governor;
Indian Tribes and other interested parties in order to consider and evaluate the impacts of this
proposed activity. Any comments received will be considered by the Corps of Engineers to
determine whether to issue, modify, condition or deny a permit for this proposal. To make this
decision, comments are used to assess impacts on endangered species, historic properties, water
quality, general environmental effects and the other public interest factors listed above.
Comments are used in the preparation of an Environmental Assessment (EA) and/or an
Environmental Impact Statement (EIS) pursuant to the National Environmental Policy Act
(NEPA). Comments are also used to determine the need for a public hearing and to determine the
overall public interest of the proposed activity.
Any person may request, in writing, within the comment period specified in this notice, that a
public hearing be held to consider the application. Requests for public hearings shall state, with
particularity, the reasons for holding a public hearing. Requests for a public hearing shall be
granted, unless the District Engineer determines that the issues raised are insubstantial or there is
otherwise no valid interest to be served by a hearing.
The Corps of Engineers, Wilmington District will receive written comments pertinent to the
proposed work, as outlined above, until 5pm, September 12, 2016. Comments should be
submitted to Mr. David Brown, Asheville Regulatory Field Office, 151 Patton Avenue, Room
208, Asheville, North Carolina 28801 at [phone] extension 232.
-17-

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HDR Engineering, Inc. of the Carolinas License Number: F-0116
440 S Church Street, Suite 1000 Charlotte, NC 28202-2075
1
2
3
PRELIMINARY
NOT FOR
CONSTRUCTION
OR
RECORDING
105-06-20161 ISSUED FOR APPLICATION FOR SECTION 404/401 INDIVIDUAL PERMIT
PE SEAL NO. DATE REVISION
4 1 5
8
DRAWING N0. REV.
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EXISTING MAJOR CONTOUR
FULL POND ELEVATION 2330
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— — — — — — RESERVOIR ROCK SPOIL
400 0 400
SCALE: FEET
CRITICAL ENERGY
INFRASTRUCTURE INFORMATION
(CEII) MATERIAL UNDER 18 CFR 388.113(c)
DRAWN BY: CIVIL DUKE ENERGY CAROLINAS, LLC
RM MAKEE EAST FORK PROJECT
CEDAR CLIFF DEVELOPMENT
DESIGNED BY: MECHANICAL AUXILIARY SPILLWAY UPGRADE PROJECT
TC BANTA APPLICATION FOR SECTION 404/401 A
CHECKED BY: ELECTRICAL INDIVIDUAL PERMIT
OVERALL SITE PLAN
APPROVED BY: DATE:
RMM TCB I
SCALE: DRAWING/SHEET N0. REV.
tLDSGN CHKDIAPPRI CIVIL JELEC IMECHI PROJECT NUMBER: 000000000228731 AS NOTED SHEET 1 -
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440 S Church Street, Suite 1000 Charlotte, NC 28202-2075
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APPROVED BY: I DATE:
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DRN I DSGN I CHKD I APPR I CIVIL I ELEC I MECH I PROJECT NUMBER: 000000000228731
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SHEET 2
LEGEND:
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EXISTING MAJOR CONTOUR
EXISTING MINOR CONTOUR
PROPOSED MAJOR CONTOUR
FULL POND ELEVATION 2330
----------------- DRAW DOWN ELEVATION 2302
BARGE LOADING STAGING AREA
BELOW FULL POND ELEVATION
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CRITICAL ENERGY
INFRASTRUCTURE INFORMATION
(CEII) MATERIAL UNDER 18 CFR 388.113(c)
DUKE ENERGY CAROLINAS, LLC
EAST FORK PROJECT
CEDAR CLIFF DEVELOPMENT
AUXILIARY SPILLWAY UPGRADE PROJECT
APPLICATION FOR SECTION 404/401
INDIVIDUAL PERMIT
AUXILIARY SPILLWAY MODIFICATIONS AND
BARGE LOADING AREA - PLAN
.E: DRAWING/SHEET N0. REV.
AS NOTED SHEET 2 -
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HDR Engineering, Inc. of the Carolinas License Number: F-0116
440 S Church Street, Suite 1000 Charlotte, NC 28202-2075
1
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GENERAL NOTES:
1. THE NCWRC AND USFWS SHALL BE
CONSULTED TO DETERMINE PLACEMENT OF
ROCK SPOIL LOCATIONS THAT ADD BOTTOM
VARIABILITY TO SERVE AS FISH ATTRACTORS
TO BENEFIT FISHING IN THE RESERVOIR.
EXISTING GROUND
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FULL POND EL 2330.0
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105-06-20161 ISSUED FOR APPLICATION FOR SECTION 404/401 INDIVIDUAL PERMIT
PE SEAL NO. DATE REVISION
4 1 5
SECTION A
SCALE: 1"=50' -
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x
SECTION B
SCALE: 1 "=50' -
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EXISTING MINOR CONTOUR
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FULL POND ELEVATION 2330
--•--••—••—•--•-- DRAW DOWN ELEVATION 2300
------ ROCK SPOIL AREA
• • 50
SCALE:
•• • 100
SCALE: FEET
CRITICAL ENERGY
INFRASTRUCTURE INFORMATION
(CEII) MATERIAL UNDER 18 CFR 388.113(c)
DRAWN BY:
CIVIL
DUKE ENERGY CAROLINAS, LLC
RM MAKEE
EAST FORK PROJECT
CEDAR CLIFF DEVELOPMENT
DESIGNED BY:
MECHANICAL
AUXILIARY SPILLWAY UPGRADE PROJECT
TC BANTA
APPLICATION FOR SECTION 404/401
CHECKED BY:
ELECTRICAL
INDIVIDUAL PERMIT
RESERVOIR ROCK SPOIL
PLAN AND SECTION
APPROVED BY:
DATE:
RMM TCB SCALE: DRAWING/SHEET N0. REV.
DRN DSGN I CHKD I APPR I CIVIL I ELEC I MECH PROJECT NUMBER: 000000000228731 AS NOTED SHEET 3 -
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440 S Church Street, Suite 1000 Charlotte, NC 28202-2075
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