129-16 Project Update 08/16/2019

APTIM
August 16, 2019
Heather Coats
Beach & Inlet Management Project Coordinator
North Carolina Division of Coastal Management
127 Cardinal Drive
Wilmington, NC 28405
Kenneth Willsoi
Program Manage
Aptim Coastal Planning & Engineering ofNort,
Caroling Inc
4038 Masonbom Loop Roai
Wilmington, North Carolin,
Tel: [phone],
Kenneth. [e-mail]
RECEIVED
AUG 2 Y 2019
MP SECTION WIRO
Subject: Hatteras Inlet Channel Maintenance Project — Written Notice of Project Initiation
Dear Ms. Coats:
The Division of Coastal Management (DCM) issued a CAMA Major Permit for the proposed Hatteras Inlet Channel
Maintenance Project on December 22, 2016 (#129-16). This letter serves as written notice of project initiation as
required in Condition 7 of the permit. Please find attached to this letter revised permit drawings dated July 29, 2019,
which provide the location of the proposed channel for the upcoming event.
The project includes maintenance dredging within a portion of the Hatteras Inlet Connector Channel, which runs
between the inlet gorge and the ferry channel in proximity to Ocracoke Island. This channel is locally referred to as the
"South Ferry Channel". The attached plan view drawing shows the location of the proposed channel, the disposal area,
and previously mapped submerged aquatic vegetation (SAV) resources in the vicinity. The channel is proposed to be
dredged by the US Army Corps of Engineers (USACE) side cast dredge Merritt. Material dredged from the channel will
be sidecasted to either side of the proposed channel.
The environmental window for dredging opens October 1, and Dare County desires to have the maintenance dredging
conducted as dose to this date as possible. Dare County, the USACE, and the NC Division of Water Quality are all
moving expeditiously to ensure the project can start as soon as possible as weather and dredge plant availability allow.
The actual dredging of the channel is anticipated to last approximately 11 days. We do not anticipate any issues with
dredging outside of the environmental windows established by the permit for the upcoming proposed maintenance
event. At the time of this letter, it is anticipated that the project will be conducted in October 2019.
As you are aware, a Major CAMA Permit (#129-16) was issued by the State of North Carolina Division of Coastal
Management (DCM) to Dare County in December 2016 for the maintenance of the connector channel. The permit was
subsequently modified in March 2018. The modified permit allows for maintenance of a 200 ft. wide channel to a depth
of -12 ft. MLW. Based on the July 16, 2019 survey, and anticipated shoaling that may occur between the time of the
survey and the start of dredging, the USACE estimates approximately 11,000 ry of material would be required to achieve
a channel depth of approximately -9 ft. MLLW within the proposed channel shown on the attached drawings, which
includes a 150 foot wide channel and a 50 foot widener in the area pinched between the two shoals encroaching on the
channel.
As required by the permit, we have contacted Don Field with NOAA to determine if any updated imagery is available
for the project area to delineate SAV habitat. Mr. Field responded that most of the area between Roanoke Island and
Bogue Inlet was flown May/June of 2019 by NCDOT. NOAA has only seen sample imagery at present and is

anticipating obtaining the full imagery set in the coming weeks. Mr. Field requested we contact him after the first of
September to check if they have received the full data set. In the CAMA Major Permit, DCM indicated that DMF staff
may perform SAV surveys in proximity to the proposed dredge location to provide an updated determination of the
presence or absence of SAV resources.
Regarding contact information during dredge activities, Brennan Dooley of the USACE will be the point of contact for
the USACE dredging operations. Brennan's Phone Number is [phone] and his email is
Brennan].Doole usace.armX.mil. I will be the County's agent and can be contacted via cell phone at [phone].
Please feel free to contact me anytime for further clarification or explanation of the project
Very truly yours,
APTIM COASTAL PLANNING & ENGINEERING OF NORTH CAROLINA, INC.
Ken Willson
Project Manager
CC:
Robert Outten, Dare County
Brent Johnson, Dare County
Jonathan Howell, NC DCM
Anthony Scarbraugh, NC DWR
RECEIVED
AUG 21 2019
MP SECTION WIRO

HATTERAS INLET MAINTENANCE PROJECT
PAMLICO SOUND
Z r- PROJECT AREA
I
HATTERAS
HATTERAS
OCRACOKE INLET
ISLAND
ATLANTIC OCEAN
CHARLOTTE
N.T.S.
NOT FOR CONSTRUCTION
FOR REGULATORY REVIEW ONLY
0 7500 15000
GRAPHIC SCALE IN FT
RALEIGH*
—
NirwgnNvniF.
CAPE FEAR
DARE COUNTY, NORTH CAROLINA
CAPE HA17ERAS
PROJECT LOCATION
=AD CITY
LOOKOUT
ATLANTIC
OCEAN
SHEET INDEX
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: CS-1 AND PV-1 ESRI JANUARY 2016, PV-2 NCDOT HATTERAS IMAGE MARCH 2O16.
4. SURVEY DATA COLLECTED BY US ARMY CORPS OF ENGINEERS. JULY 16, 2019.
5. BATHYMETRIC CONTOURS REPRESENT THE CONDITIONS OF THE CHANNEL ON JULY 16, 2019 AND SHOULD NOT BE
RELIED ON FOR NAVIGATION PURPOSES.
117e1dRlIll
MEAN LOW WATER LINE
MEAN HIGH WATER LINE
CROSS SECTION LINE
HATTERAS INLET BORINGS 2003 AND ID
NEARSHORE DISPOSAL AREA
SUBMERGED AQUATIC VEGETATION AND 100 FT. BUFFER
ASBUILT EXISTING CABLE ROUTE (CALDWELL CABLE VENTURES)
EXISTING CABLE ROUTE (UTLITY ELECTRICAL CONSULTANTS, PC)
ASBUILT NEW CABLE ROUTE
+1.53' NAVD88
+0.52' MHW
+0.08' MLW
+0.00' MLLW t
\ TIDAL DATUM
TIDAL DATUM REFERENCE BASED ON NOAA TIDE
STATION ID 8654467 EPOCH 1983-2001"
RECEIVED
AUG 21 2019
MP SECTION WIRO
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AUG 21 2019
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MP SECTION WIRO
DMWING NO.
0 1000 2000
PV-1
GRAPHIC SCALE IN FT
T.

BOTTOM OF CUT/ CHANNEL
COORDINATE TABLE
POINT ID
NORTHING
EASTING
I ELEVATION
A
540144.2
2963815.2
-10.0
B
540274.2
2964898.3
-10.0
C
540323.8
2964892.3
-10.0
D
540459.3
2966021.7
-10.0
E
540409.7
2966027.7
-10.0
F
540541.7
2967128.3
-10.0
G
540392.8
2967146.2
-10.0
H
539995.3
2963833.1
-10.0
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LIFE SAVING STATION \\
AVOIDANCE AREA
NOT FOR CONSTRUCTION
FOR REGULATORY REVIEW ONLY
CHARTED WRECK
AVOIDANCE AREA
0
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GRAPHIC SCALE IN FT
CHANNEL
CORRIDOR
�S
i
i
RECEIVED
i
AUG 21 2013 \
MP SECTION WIRO
NOTE: \
1. ELEVATIONS ARE REFERENCED TO MLLW.
PERMITTED DREDGE DEPTH IS RELATIVE TO
THE MLW DATUM BEING APPROXIMATELY
BREAKING SHOAL 0.08' ABOVE MLLW PER NOAA PID EX0400.
AVOIDANCE AREA
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HATTERAS
INLET
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--- ZO—L----------------—--------------_—._--� 15 TARGET AD EL. _ -10.0' MLLW I. . . . . . . -15 i E
u1 MAXIMUM AD EL. _-11.92'MLLW I CONNECTOR CHANNEL EXTENDS _20 TO EQUAL DEPTH AT . -20 TIME OF CONSTRUCTION
I.
25250 0 560 1000 1500 2000 2500 310 3500 3750 25
DISTANCE ALONG SECTION (FEET)
CROSS SECTION C-C'
5 A -A' 5
CROSS SECTION B-B' JULY 16, 2019
A -A' ° EXISTING GRADE
MHW EL. +0.52 _ _ _
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LL EXISTING GRADE J 1 L J 1 s
5 5 10 3 3 EL. -10.0' MLLW _10 M
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CHANNEL
O 10 1. s . EL. -10.0' MLLW _10 j 15 WIDTH 200' I 15
t -
~ TARGET AD EL. _ -10.0' MLLW
TARGET AD EHANNEL
L. = -10.0 MLLW w I
W -15 WIDTH YSO,' . . . . . . -15 -20 . T -20 o z
I MAXIMUM AD EL. = -11.92 MLLW ao�
MAXIMUM AD EL. =-11.92' MLLW 2 z w
wa6zz
-20 -20 -25 -25 i" Z. °
750 500 0 500 750 750 500 0 500 750 RECEIVED =� rv<zov
DISTANCE ALONG SECTION (FEET) DISTANCE ALONG SECTION (FEET) m z G uw
AUG 21,2019 c='so"
b' u0
w¢
NOTE: MP SECTION WIRO
NOT FOR CONSTRUCTION 1. ELEVATIONS ARE REFERENCED TO MLLW. PERMITTED DREDGE
FOR REGULATORY REVIEW ONLY DEPTH IS RELATIVE TO THE MLW DATUM BEING DPAW NG NO.
APPROXIMATELY 0.08' ABOVE MLLW PER NOAA PID EX0400. 0 5 10 0 250 Soo
2. MAXIMUM AD EL. OF -11.92 MLLW SHOWN ON CROSS SECTIONS XS-1
IS EQUAL TO -12.00 MLW PER NOAA PID EX0400. VERTICAL GRAPHIC SCALE IN FT HORIZONTAL GRAPHIC SCALE IN FT
_.— IHEET 4 OF 4