Hatteras Inlet Project Report October 12/6/2021

Kenneth Willson
Program/Project Manager
Coastal Protection Engineering of North Carolina, Inc.
COASTAL
PROTECTION
ENGINEERING
December 61 2021
David Bernhart
NMFS — Protected Resources Division
263 13th Avenue South
St. Petersburg, FL 33701
Subject: Hatteras Inlet Project Report (USACE Action ID. SAW-2016-02140)
Dear Mr. Bernhart:
4038 Masonboro Loop Road
Wilmington, North Carolina
Tel: [phone]
[e-mail]
This letter serves as the project report required by special condition #24 of the above referenced permit,
which allowed Dare County to conduct maintenance dredging within the Connector Channel Corridor located
between Ocracoke Island and Hatteras Island, North Carolina. Special condition #24 requires that a project
report summarizing the results of the dredging and the sea turtle take (if any) be submitted to NMFS within
30 working days of completion and that the reports shall contain information on project location, start-up
and completion dates, cubic yards of material dredged, incidental takings (include photographs, if available)
and sightings of protected species, mitigating actions taken, screening type (inflow, overflow) utilized, daily
water temperatures, name of dredge, names of endangered species observers, percent observer coverage, and
any other information the contractor deems relevant.
Project Description:
On October 3, 2021, the US Army Corps of Engineers (USACE) operated Sidecast Dredge Murden began
dredging in the Connector Channel (locally referred to as the South Ferry Channel) in the vicinity of Hatteras
Inlet. The Dredge Murden conducted 24-hour operation maintenance dredging in the channel for
approximately 4 days between October 3 and October 6. The Dredge Murden concluded its dredging at
approximately 6:00 AM on October 6 and moved to the Ocracoke Channel. The Dredge Merrztt conducted
maintenance dredging in the channel for approximately 1 day on October 7. The Dredge Merr' could not
effectively continue to dredge in the cut longer than one day due to shallow depths on either side of the
channel. A comparison of surveys conducted by the USACE on September 21, 2021 and October 6, 2021,
indicated the removal of approximately 10,000 CY of material within the area reported to have been dredged
by the dredge crews. The removal of the material resulted in controlling depths of approximately -8 ft. MLLW
through the South Ferry Channel with a minimum width of approximately 40 feet in the narrowest point of
the dredged channel at approximately elevation -6 ft. MLLW.
Survey charts for the September 21, October 6, survey events are provided in Attachment 1.

For the past year, the deep water channel allowing for navigation through the South Ferry Channel from
Sloop Channel to the Hatteras Inlet gorge, has been maintained in the some location. The maintenance
dredging of this channel through the use of sidecast dredges resulted in a very narrow channel with relatively
high elevations on either side of the channel. The elevations adjacent to the channel on both the north and
south side have restricted the amount of maintenance dredging that can be conducted due to the condition
of the permits that prohibits discharging of dredged material in areas where elevations are greater than mean
low water. County and USACE navigation branch staff have been working to develop and execute an
alternative dredge plan to realign the channel in an area that would extend the period of time between
maintenance events and allow for a wider, more dependable channel.
Following the early October dredge event rapid shoaling of the channel prompted Dare County to request
the USACE to bring one of its dredges back to the South Ferry Channel to conduct additional maintenance
dredging. The sidecast Dredge Menztt was the only available dredge plant. A condition survey conducted on
November 10 indicated that additional shoaling had occurred in the previously maintained channel and that
an area to the north and west of the channel had scoured slightly. The November 10 conditional survey is
included in Attachment 1. The designed box for dredging of the alternative channel is shown in Attachment
2.
On November 11, 2021, the Dredge Menztt began dredging a channel in the vicinity of where the scouring was
indicated in the November 10, 2021 survey. The Dredge Merritt conducted 12-hour operation maintenance
dredging in the channel for approximately 10 days between November 11 and November 21. A comparison
of surveys conducted by the USACE on November 10 and November 22, 2021, indicated the removal of
approximately 14,000 CY of material within the area reported to have been dredged by the dredge crew. The
removal of the material resulted in controlling depths of approximately -7 ft. MLLW through the South Ferry
Channel with a minimum width of approximately 70 feet in the narrowest point of the dredged channel at
approximately elevation -6 ft. MLLW.
Survey charts for the October 20, November 1, November 10, November 17, and November 22, 2021 survey
events are also provided in Attachment 1
Mitigation Actions and Observations:
In accordance with the permit, the applicant provided written notice to the USACE Regulatory Division and
the Division of Coastal Management prior to October maintenance dredging activities. These written notices
dated September 23, anticipated dredging to occur between October 41" and October 251", 2021.
The originally stated goal of the October 2021 maintenance event was to establish an approximately 8 ft. deep
channel with bottom width of approximately 150 ft. Based on the conditional survey conducted by the
USACE on September 21, 2020, establishment of the proposed channel would have required the dredging of
approximately 31,600 cy of material. The proposed channel is shown on the project drawings (Attachment 3),
which include both plan view and cross -sectional view.
In order to take steps to establish a more dependable channel during the winter months, additional
maintenance was performed in a new area. In accordance with the permit, the applicant provided written
notice to the USACE Regulatory Division and the Division of Coastal Management prior to November
maintenance dredging activities. These written notices dated October 27, anticipated dredging to occur after
October 281", 2021. However, the actual dredging that occurred differed from what was included in the
October 27 plan. The USACE Regulatory Division and the Division of Coastal Management were kept
updated on all of modifications to the Dredge Plan, which were all conducted in compliance with the issued
permits. The updated dredge plan, which was developed by the USACE Navigation Branch on November
11 using the November 10 survey, was provided to the USACE Regulatory Division and the Division of
Coastal Management on November 12.

The County and its consultant (CPE) coordinated closely with both NC DCM and USACE regulatory staff
on the progress of the project. In accordance with the permit, construction activities complied with the
"Guidelines for Avoiding Impacts to the West Indian Manatee". Furthermore, sidecast dredge operations
ceased operations when the shoals on either side of the channel, on which material was being discharged,
appeared to approach an elevation of MLW. This was done to avoid placement of material above the MLW
to avoid impacts to federally listed Seabeach Amaranth, Piping Plover, Red Knot, Green sea turtle, Hawksbill
sea turtle, Kemp's ridley sea turtle, Leatherback sea turtle, Loggerhead sea turtle, and their habitat
To the knowledge of the contractor, no protected federally listed species was killed, injured, captured,
harassed, or otherwise harmed by the conduct of the maintenance activities (i.e. no incidental takings). No
protected species were observed during the conduct of the work; however, protected species observers were
not required as a condition of the permit Furthermore, in accordance with the permit, material excavated
by the Sidecast Dredge Merritt and Sidecast Dredge Murden was placed at least 100 linear feet from known
SAV resources.
Please feel free to contact me should you have any additional questions regarding this project.
Very truly yours,
COASTAL�PR TEECCTTIIO�N EENGIINNEERING OF NORTH CAROLINA, INC.
Ken Willson
Project Manager
CC: Josh Pelletier — USAGE
Fritz Rhode — NMFS-HCD
Heather Coats — NC DCM
Barton Grover — Dare County
Attachments: Attachment 1 —Pre-Construction and Post -Construction Survey Charts
Attachment 2 — Updated Construction Drawing dated November 12, 2021 showing the location of the
modified South Ferry Channel alignment
Attachment 3 — Construction Drawings dated September 23, 2021

Attachment 1— Survey Charts

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Attachment 2 — Updated Construction Drawings showing the
location of the Modified South Ferry Channel Alignment

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Attachment 3 — Construction Drawings

HATTERAS INLET MAINTENANCE PROJECT
DARE COUNTY. NORTH CAROLINA
PAMLICO SOUND
HATTER.4
INLET.-
OCRACOKE
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PROJECT AREA
ATLANTIC OCEAN
N.T.S.
NOT FOR CONSTRUCTION
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MOREHEAD CITY
CAPE LOOKOUT
CAPE FEAR
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1 COVER SHEET
2 PROJECT OVERVIEW
3 CONNECTOR CHANNEL PLAN VIEW
4 CONNECTOR CHANNEL CROSS SECTIONS
GENERAL NOTES:
1. COORDINATES ARE IN FEET BASED ON NORTH CAROLINA STATE PLANE COORDINATE SYSTEM, NORTH AMERICAN
DATUM 1983, (NAD83)
2. ELEVATIONS ARE REFERENCED TO MLLW. PERMITTED DREDGE DEPTH IS RELATIVE TO THE MLW DATUM BEING
APPROXIMATELY 0.08' ABOVE MLLW PER NOAA PID EX0400.
3. DATE OF AERIAL PHOTOGRAPHY: FEBRURARY 16, 2021, COURTESY OF USACE.
4. SURVEY DATA COLLECTED BY US ARMY CORPS OF ENGINEERS. SEPTEMBER 21, 2021.
5. BATHYMETRIC CONTOURS REPRESENT THE CONDITIONS OF THE CHANNEL ON SEPTEMBER 21, 2021 AND SHOULD
NOT BE RELIED ON FOR NAVIGATION PURPOSES.
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MEAN LOW WATER LINE
MEAN HIGH WATER LINE
CROSS SECTION LINE
HATTERAS INLET BORINGS 2003 AND ID
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SUBMERGED AQUATIC VEGETATION AND 100 FT. BUFFER
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TIDAL DATUM REFERENCE BASED ON NOAA TIDE
STATION ID 8654467 EPOCH 1983-2001"
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