Em to agencies for comment _External_ RE_ Kitty Hawk dune extension authorization

Hello everyone,

Some of you have already received this, but I wanted to also pass along to those of you who hadn’t to make sure there weren’t any concerns regarding another proposed engineered “dune”
modification in Kitty Hawk. Ken summarizes the changes below, part of which is a reduction in scope, but with part pushing out waterward from their last request and prior construction
drawings. Ultimately, it is still located waterward of the alignment originally proposed in their application back in 2021. Adam has also supplied more detailed 100’ profiles in the
attached email using the before dredge (BD) survey data and two profiles that show the 2017 post-construction alignment (these were only surveyed at 1000’ intervals) and an aerial to
help depict current conditions and station locations.

Please let me know if you have any questions or concerns and thanks in advance!

Heather

Heather Coats

Beach & Inlet Management Project Coordinator

Division of Coastal Management

North Carolina Department of Environmental Quality

910 796 7302 office

[e-mail] <mailto:[e-mail]>

127 Cardinal Drive Extension

Wilmington, NC 28405

Email correspondence to and from this address is subject to the

North Carolina Public Records Law and may be disclosed to third parties.

From: Ken Willson <[e-mail]>
Sent: Thursday, August 4, 2022 5:07 PM
To: Coats, Heather <[e-mail]>; Stewart, Andy <[e-mail]>
Cc: Pelletier, Josh R SAW <[e-mail]>; Pietila, Tanya K <[e-mail]>; SVC_DCM.MHC.Admins <[e-mail]>; Renaldi, Ronald <[e-mail]>;
Loeffler, Sarah W <[e-mail]>; Adam Priest <[e-mail]>; Samuel Lohman <[e-mail]>
Subject: [External] RE: Kitty Hawk dune extension authorization

CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to Report Spam. <mailto:[e-mail]>

Heather,

Thanks for sending this over. We really appreciate it.

After the Kitty Hawk plans reflecting pre-construction conditions were submitted to you and Josh on June 27, you and I discussed some constructability issues with the dunes at the northern
end of Kill Devil Hills and southern end of Kitty Hawk. An email sent to you on July 16, 2022, explained the slight modifications made to “field fit” the design to the existing conditions
along the approximately 400-foot section in questions. That section of the project was constructed July 18 through 20.

Given some of the constructability issues encountered in that small section of dune along the KDH/KH boundary, Weeks Marine collected conditional data along profiles at 100-foot spacing
along the approximately 2,000-foot section of dune proposed for repair between baseline station 166+00 and 143+00. Using the data from these conditional surveys, CPE was able to lay
out the dune more accurately fitted to existing conditions. This revision of the dune alignment resulted in some slight differences compared to what was shown on the plans dated 6/21/22
/ 6/26/22. Attached is a revised set of plans with Revision date 8/1/22.

For your convenience, I have provided the following list of revisions made to the dune design:

* The proposed southern extent of dune repair terminates in the vicinity of station 164+00. Previously the dune repairs were shown to extend 200 feet to the south to station 166+00.
* The proposed dune at 164+00 ties into the existing starter dune located just south of station 164+00.
* The proposed dune between 157+50 and 164+00 has a crest height of +15 ft. NAVD88 and ties into the existing dune along this section of beach. The dune alignment along this section
was adjusted to avoid impacts to oceanfront structures. The previous plans indicated a dune crest of +18 ft. along this area, but we are proposing a decrease in the crest elevation
to +15 ft.
* The proposed dune projecting out seaward in front of the oceanfront homes between stations 157+00 and 159+00 is shown as a 1V:3H slope up to +15 with no dune crest at the top. Essentially
the contractor would only be constructing the face of the dune, without a dune crest. It will align with the current pile of sand that was constructed by the homeowner at this station.

* South of Station 157+00, when compared to the dune alignment shown on the previously submitted pre-construction plans, the realignment reflected in the revised plans resulted in a
seaward movement of the seaward toe of dune ranging from 30.2 feet to 51.3 feet (42 feet on average). However, the realigned dune is still considerably landward of where the starter
dune was constructed in 2017 and will tie directly into the existing dune.
* North of Station 157+00 we have used the Weeks Marine Data and recent photos to best match the proposed dune to conditions prior to the recent erosion. In some areas, only the slope
of the seaward dune will be constructed, tying into the existing dune scarp. In other areas, a minimum dune crest width to allow constructability is proposed. Effectively, when compared
to the dune alignment shown on the previously submitted plans, the revised dune has resulted in a slight landward movement of the toe of dune position at station 145+00 and 146+00,
no change to the seaward toe of dune position at station 147+00 through 149+00, and a seaward movement of the seaward toe of dune from stations 150+00 to 157+00 ranging from 3.1 feet
to 19.3 feet (11 feet on average).
* The northern extent of dune repair will terminate in the vicinity of station 143+00. Previously the dune repairs were only shown to extend north to station 144+00.

It is the intention of the Town of Kitty Hawk and the Contractor to adhere to the attached drawings and all existing permit conditions if the USACE and Division of Coastal Management
concur to these revisions.

As we mentioned on the call yesterday, the dredge is scheduled to return to the site sometime between August 13 and 15, but this section of the beach will be one of the first areas the
begin to construct. Please reach out to me if you would like to talk this through or if anything is left unclear.

Kind Regards,

Ken Willson

Senior Project/Program Manager

Main: 910-399-1905

Mobile: [phone]

[e-mail] <mailto:[e-mail]>

Coastal Protection Engineering

4038 Masonboro Loop Road

Wilmington, NC 28409

From: Coats, Heather <[e-mail] <mailto:[e-mail]> >
Sent: Wednesday, August 3, 2022 3:36 PM
To: Stewart, Andy <[e-mail] <mailto:[e-mail]> >; Ken Willson <[e-mail] <mailto:[e-mail]>
>
Cc: Pelletier, Josh R SAW <[e-mail] <mailto:[e-mail]> >; Pietila, Tanya K <[e-mail] <mailto:[e-mail]> >;
SVC_DCM.MHC.Admins <[e-mail] <mailto:[e-mail]> >; Renaldi, Ronald <[e-mail] <mailto:[e-mail]> >; Loeffler, Sarah
W <[e-mail] <mailto:[e-mail]> >
Subject: Kitty Hawk dune extension authorization

Hi Andy and Ken,

Please see the attached letter of refinement to authorize the requested dune extension in Kitty Hawk.

Let me know if you have any questions or need anything else. Andy- the hard copy will also be mailed to you.

Best regards,

Heather

Heather Coats

Beach & Inlet Management Project Coordinator

Division of Coastal Management

North Carolina Department of Environmental Quality

910 796 7302 office

[e-mail] <mailto:[e-mail]>

127 Cardinal Drive Extension

Wilmington, NC 28405

Email correspondence to and from this address is subject to the

North Carolina Public Records Law and may be disclosed to third parties.

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