U-5878 Commerce Road Extension in Jacksonville flood plain benches

From:Westphal, Anneliese
To:Steffens, Thomas A CIV USARMY CESAW (USA); Sprinkle, Hannah H
Cc:Farrell, Sean C
Subject:U-5878 Commerce Road Extension in Jacksonville flood plain benches
Date:Friday, January 27, 2023 11:05:24 AM
Attachments:Sheet 3 and 4 from Onslow U-5878_Permit Packet_20220627.pdf
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Hi Tom and Hannah,
After a discussion with the assistant resident and Mason regarding the subject project and we are
proposing a change to the flood plain benches that are shown on the inlet and outlet ends of the
Site 2 culvert on the subject project. The Site 2 culvert is the double barrel culvert at approximately
Sta. 24+50. There is a concern that if the benches are constructed out of native material (and coir
fiber matting) the material may move or erode during a rain event. We are proposing that they be
constructed using Class 1 riprap.

I have attached 2 permit drawings sheets from the permit for the project. On sheet 3, I have
sketched (in green) the area where rip rap is proposed. I didn’t make any notes on sheet 4, but
included it for reference.

Please let me know your thoughts regarding this proposal or if you need additional information.

I hope we will have time to visit this site (after the NC 24 Living Shoreline project) next Wednesday
(February 1) during our Onslow ride through day.

Thanks,
Anneliese

Anneliese Westphal
Environmental Senior Specialist
Division 3
NCDOT- Division of Highways

910 341 2000 office
910 604 1330 mobile
910 675 0143 fax
[e-mail]

5501 Barbados Blvd
Castle Hayne, NC 28429-5647

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