20180760 Ver 2_Pre-Filing Meeting Information_20210413

DWR Pre -Filing Meeting Request Form
NORTH CAROLINA
£nvircnine h f Quoliry
ID#*
Regional Office *
Reviewer List*
20202022
Version *
1
Wilmington Regional Office - [phone]
Joanne Steenhuis
Pre -Filing Meeting Request submitted 12/29/2020
Contact Name *
Contact Email Address*
Project Name*
Project Owner*
Project County*
Owner Address:
Troy Beasley
[e-mail]
ILM Ditch/Drainage Runoff Mitigation
New Hanover County Airport Authority
New Hanover
Street Address
1470 Airport Blvd
Address Line 2
Suite 112
City State / Bovine/ legion
Wilmington North Carolina
Fbstal / Zip Code Country
28405 USA
Is this a transportation project?* Yes ( No
Type(s) of approval sought from the DWR:
401 Water Quality Certification - I— 401 Water Quality Certification -
Regular Express
I Individual Permit 1—
I Shoreline Stabilization
Does this project have an existing project ID#? *
Yes No
Do you know the name of the staff member you would like to request a meeting with?
Please give a brief project description below.*
The purpose of the proposed project is to meet FAA requirements by
mitigating public safety hazards associated with aircraft travel by
preventing human and wildlife access within the airfield at the project
location to improve aircraft safety. The proposed project will address
excessive erosion within the stream feature (Stream 1) resulting from
extraordinary rainfall and flooding from Hurricane Florence which

aestaauizea tne cnannei. Stream ] is the outlet for tne stormwater
drainage system for approximately 37-acres within the airport. The
erosion within the channel continues to get worse with each heavy rainfall
event and has eroded out a large area underneath the perimeter security
fence. The erosion continues to widen the channel at the perimeter
security fence, resulting in the airport maintenance regularly having to
block the new holes under the fence with metal rods. The metal rods then
catch debris, which causes the stream to erode around the metal posts,
creating a constant maintenance issue. The frequent undermining of the
perimeter security fence poses a significant security risk, as the erosion
creates access points into the airfield for both humans and wildlife at the
Runway 6 approach. The erosion and sedimentation have also created
conditions within the channel that is attracting wildlife. These conditions
create a safety issue as Stream 1 is within the Runway 6 Approach and
approximately 800 If from the end of Runway 6, greatly increasing the
likelihood of a wildlife strike with an aircraft.
Additionally, the head cut from the erosion has progressed approximately
300 If upstream from the perimeter security fence to the perimeter road
culvert in approximately 18-months. If not addressed, the erosion will
undercut the perimeter road culvert and continue upstream, threatening
the integrity of Runway 6. Since the initial damage to the stream channel
and ensuing erosion resulted from flooding from Hurricane Florence, the
proposed project is being funded by FEMA. FEMA prepared a Record of
Environmental Consideration (REC) in accordance with NEPA, which
determined that the proposed project met conditions for authorization
under a CATEX category *N9 — Federal Assistance for Flood Hazard
Reduction Actions. The FEMA REC has been provided as an attachment.
The proposed project proposes to permanently impact Stream 1, of which
approximate 72 If is tidal and 244 If is non -tidal. The project proposes to
grade the slopes of the channel to a 3:1 slope and line the entire channel
with an articulating concrete block geogrid system which will permanently
stabilize the channel and prevent future erosion and undermining of the
perimeter security fence, permanently eliminating the reoccurring safety
issue at this location. The articulating concrete block liner is pervious,
allowing water to infiltrate through it, as well as vegetation to grow through
it. The stream channel will be lined from the existing culvert in the
perimeter road to an existing culvert approximately 25 If downstream of
the existing security fence. The articulating concrete block system has
been used to stabilize other onsite stormwater swales at ILM and it has
been very affective (see Photo Documentation). The perimeter security
fence will be relocated over the existing culvert to the west to avoid
potential future issues with erosion compromising the perimeter security
fence. A concrete headwall will be constructed on the upstream end of
the existing culvert to provide permanent stabilization of the culvert and
prevent future erosion.
The completion of the project will increase aircraft and public safety as
part of the normal daily operation and activities associated with the
operation of the airport. Please note that the proposed project will not
create any additional impervious area and will not change the existing
volume of stormwater drainage discharging into downstream portions of
Stream 1.
The project will require a CAMA major development permit as well as a
401 WQC.
Please give a couple of dates you are available for a meeting.

1 / 11 /2021
1/12/2021
1/13/2021
1/14/2021
1/15/2021
Please attach the documentation you would like to have the meeting about.
CAMA Exhibits.pdf
pdf only
3.33MB
By digitally signing below, I certify that I have read and understood that per the Federal Clean Water Act Section
401 Certification Rule the following statements:
• This form completes the requirement of the Pre -Filing Meeting Request in the Clean Water Act Section 401 Certification
Rule.
• I understand by signing this form that I cannot submit my application until 30 calendar days after this pre -filing
meeting request.
• I also understand that DWR is not required to respond or grant the meeting request.
Your project's thirty -day clock started upon receipt of this application. You will receive notification regarding meeting location
and time if a meeting is necessary. You will receive notification when the thirty -day clock has expired, and you can submit an
application.
Signature
Submittal Date
12/29/2020
Reviewer Meeting Request Decision
Has a meeting been scheduled?*
r Yes r No