Appendix I - Scoping Meeting Summary

APPENDIX I
SCOPING MEETING SUMMARY
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Oak Island 2021/2022 Renourishment Project
Agency Scoping Meeting via WebEx
October 23, 2020
Attendance: Dawn York, Moffatt & Nichol (M&N); Johnny Martin, M&N, Katie Finegan, M&N; Brandon
Grant, M&N, Sam Morrison, M&N; Mark Pirrello, M&N, Cameron Weaver, DCM; Heather Coats, DCM;
Tara MacPherson, DCM; Ben Brink, DCM; Jonathan Howell, DCM; Kim Harding, DMF; Greg Currey,
USACE; Kathy Matthews, USFWS; Maria Dunn, NCWRC; Robb Mairs, NCDWR; Tyler Benson, NCDWR
A sign-in sheet with contact information is provided at the end of these notes.
Presentation: Katie Finegan, coastal engineer with M&N, provided a summary of the project via
PowerPoint. The presentation is provided as an attachment.
Summary of Discussion Points:
• Kathy Matthews, USFWS – the Munsell color is supposed to be measured when wet – 10YR 5/1
is the preference standard color when wet. If wet the material now what would it be? Would
like to see comparison of color.
o Preference is for Jay Bird Shoal to be used as it seems to be better material and less
shell and fines and lighter in color.
o Dune profile – appreciate the steepening of the slope on frontal and understand it
cannot be steeper due to lack of walkovers. Back slope should be shallower to allow for
it to tie into existing elevation – no dips. Property and lack of tie in may be difficult.
o If turtle gets up and over FWS wants the turtle to be easily able to get back over the
dune and not stuck on the backside of the dune due to loss of sight. Especially
hatchlings will have difficulty.
• Maria Dunn, NCWRC – mirror concerns with sediment color and increased carbonate with
Central Reach borrow area. Jay Bird Shoals is a better match for the native beach.
o Back dune slopes should be tied into existing to avoid dips.
• Johnny Martin, M&N – due to hurricane impacts, tie in is more difficult as there is minimal
elevation. Hope is with 4:1 dune slope the turtles will nest in lower parts of dune profile.
o Central Reach borrow area concerns – have these same concerns been expressed for
Holden Beach Central Reach project constructed in 2017?
o Plans and specs can include contractor condition when hitting a bad sediment streak
and move back to Jay Bird shoals.
o It is very important to provide a cost-effective source of sediment due to hurricane
impacts.
• Discussion of sand temperature relative to sea turtle nesting success. Concern with heat related
effects on sea turtle nesting and referenced the sand temperature study conducted by M&N.
• Kathy – lack of true native material characterization due to historical nourishment efforts for
past decades. Native testing is not truly indicative of the native beach.
• Johnny – review of use of Central Reach Borrow Area and what concerns were raised for
previous use of borrow area and sediment characterization. Need to provide solutions for hot
spot erosion as well as alternatives to be included in the 50-Year Master Plan.
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• Heather Coats, DCM – given the dune issue since the last project was permitted and wanted to
reinitiate the discussion considering the first phase has not been constructed yet.
o Is the dune location appropriate based on 2016 aerials? Beach looks different than in
2016.
o Review of plans and aerial used it does not show how far out the dune goes out based
on current elevations and profiles.
o The 2001 project resulted in dune out on the beach with a wide trough however many
of the current dunes do not exist.
o How much public beach will be remaining after initial erosion and adjustment; how
much dune will be remaining? Ensure public’s use of beach is not impacted.
o How was equilibration evaluated?
o Maria – if dune is pushed out too much it will result in escarpment. Use updated aerial
to show present conditions.
o Johnny – with regards to the berm design, it is based on available funding to construct
the project. Design is based on placing material to provide immediate protection until
50-Year plan is implemented. Storm protection is necessary and placement of material
in berm/dune is to provide immediate protection.
 Concerns of steepening and equilibration will reduce risk of sea turtles moving
over the dunes.
 Public safety is a concern for dunes that are constructed too steep.
o Kathy – FEMA declaration is a recent update; has Town discussed?
 David Kelly indicated that they have talked with FEMA and current projects are
already under consideration and need to move forward due to time constraints.
Existing FEMA funding would be removed for Hurricane Matthew impacts if the
Town were to request additional FEMA funds.
o Maria – profiles and placement of dunes are important as this is critical habitat for
loggerhead sea turtles and would not want to lose habitat.
• Dawn York, M&N – Confirmed an updated CAMA narrative would be provided with the new
DWR required statement.
• Meeting adjourned at 11:09 am.
SIGN UP SHEET
SCOPING MEETING
Oak Island Beach Renourishment
Oak Island
Brunswick County

October 23, 2020

NCDEQ
WILMINGTON REGIONAL OFFICE
127 CARDINAL DRIVE
WILMINGTON, NC 28405
910-796-7215, FAX [phone]
Name Agency Phone Email
Cameron Weaver NCDEQ-DEACS 910-796-7265 [e-mail]
Maria Dunn NCWRC 252-948-3916 [e-mail]
Kim Harding DMF 252-264-3901 [e-mail]
David Kelly Town of Oak Island 910-201-8002 [e-mail]
Greg Currey USACE 910-523-1151 [e-mail]
Dawn York Moffatt & Nichol 910-218-7087 [e-mail]
Johnny Martin Moffatt & Nichol 919-781-4626 [e-mail]

Jonathan Howell DCM 252-808-2808 [e-mail]
Katie Finnegan Moffatt & Nichol 919-781-4626 [e-mail]

Brandon Grant Moffatt & Nichol 919-781-4626 [e-mail]

Sam Morrison Moffatt & Nichol 919-781-4626 [e-mail]

Tara MacPherson DCM 910-796-7266 [e-mail]
Heather Coats DCM 910-796-7302 [e-mail]
Kathy Matthews USFWS 919-856-4520 [e-mail]
Mark Pirrello Moffatt & Nichol 919-781-4626 [e-mail]

Robb Mairs DWR-401 910-796-7303 [e-mail]
Tyler Benson DWR-401 910-796-7336 [e-mail]

X Twyla Cheatwood NOAA-NMFS 252-728-8758 [e-mail]

X Unavailable

Oak Island 2021/2022 Renourishment Project
Agency Scoping Meeting
Oak Island Shoreline Management Summary
•Hurricane Isaias Recovery Efforts
–Emergency dune push –completed Sept 2020
–Dune repair with overwashed sand –Nov/Dec 2020
•2020/2021 Renourishment Project –permits issued, contractor selected, construction
Jan/Feb 2021
•USACE AIWW Bend Widener –Winter 2020/2021
•2021/2022 Renourishment Project –permit application submitted, construction Winter
2021/2022
•50-Year Master Beach Nourishment Plan –underway
Oak Island Caswell Beach
Oak Island 2021/2022 Renourishment Project
Purpose and Need:
•With the passing of Florence and Michael in 2018, Dorian in 2019, and Isaias in 2020, the Town is
taking proactive measures to restore the oceanfront shoreline and dune to provide protection.
•Purpose is to provide long-term protection to infrastructure from a 25-yr return period storm event and
provide additional protection at a ‘hotspot’ located on the West End.
•Need is to protect and preserve a large portion of the Town’s infrastructure, tourism industry, tax base,
and enhance recreational beach access.
2021/2022 Project vs 2020/2021 Project:
•Beach placement area 26,100 ft of shoreline
•Beach placement area 4,300 ft of shoreline (previously permitted in 20/21 project)
•Total volume to be dredged is 1.703 mcy
•Deeper dredge depths in Jay Bird Shoals (updated modeling)
•Addition of Central Reach borrow area (west end cost savings)
•4.67 mcy w/ +2 ft OD
•3.69 mcy w/o OD
•1.1 mcy removed during 20/21 project
•Marine debris –expected to be wire
•304 acres –same dredge footprint
•Updated modeling performed
Borrow Area –Jay Bird Shoals
Zone Proposed
Dredge
Elevation (ft
NAVD88)
Previously
Permitted Elevation
(ft NAVD88)
1 -28.0 -26.0
2 -37.0 -31.0
3 -29.0 -27.0
Borrow Area –Jay Bird Shoals
Modeling Results:
•Template 1 –21/22 project, Template 2 –
20/21 project
•Areas of potential effect are same
•Patterns similar to previous modeling
•Model includes 2 ft of OD
•Discussions with Caswell Beach
•Monitoring of Caswell part of previous
permit, committed to continue monitoring
shoreline changes
Borrow Area –Jay Bird Shoals
–Fine to medium sand
–Good color (10YR-5/1,
10YR-7/1)
–Low carbonate
JB-22
JB-21
JB-20
JB-17
JB-18
JB-12
JB-11A
JB-08
JB-07
JB-06
JB-01
JB-13
Zone 1
avg. 5.8’
Zone 2
avg.
9.8’
Zone 2
avg.
9.8’
Zone 3
avg.
6.9’
Borrow Area –Central Reach
•1.2 mcy w/ +2 ft OD
•615 kcy w/o OD
•AR –430
•180 acres
•Cost savings for
west end placement
Zone Dredge Elevation
(ft, NAVD88)Volume (cy)Overdredge Elevation
(ft, NAVD88)Volume (cy)
Zone 1 -38 117,010 -40 252,039
Zone 2 -39.7 224,200 -41.7 370,470
Zone 3 -37.3 20,160 -39.3 86,536
Zone 4 -40 253,630 -42 471,774
Total 615,000 1,180,818
Borrow Area –Central Reach
–Medium sand
–Color meets
recommendation of
10YR-5/1
–Low carbonate
Central-18
Central-16
Central-15
Central-10
Central-09
Central-08
Central-07
Central-01
Zone 2 avg. 3’
Zone 1
avg. 1.7’
Zone 3 avg. 0.5’
Zone 4 avg. 2.3’
Sediment
Compatibility
2019
Native
Global
Mean
NCAC
Maximum
Jay Bird
Shoals
Composite
Central
Reach
Composite
Gravel 0.45%≤ 6%1.59%3.40%
Granular 0.71%≤ 11%3.57%4.97%
Sand 96.96%-90.23%86.53%
Fines 1.88%≤ 7%4.61%5.09%
Carbonate 9.72%≤ 25%13.98%16.17%
Median (mm)0.26 -0.27 0.22
Mean (mm)0.27 -0.34 0.32
Characteristics are a composite average down to specified zone dredge elevations (including OD)
Borrow Area –Jay Bird Shoals & Central Reach
All dry colors for vibracores meet recommendation of 10YR-5/1
•Template designed for 25-yr return
period storm event
•Dune crest width 10 ft
•Dune crest elev. b/w 13.0 ft -15.5 ft
NAVD88
•Back dune slope 5H:1V
•Front dune slope 4H:1V
Template
•Dune slope will break at 7 ft NAVD88 and
continue out on a 20H:1V to tie in
•Some areas have flat berm 15 –120 ft wide
(meet minimum construction fill
requirements & hotspot placement)
•Planting to occur on dune back slope and
crest
Inlet Hazard Area
•Western 800 ft of project
•No new dune creation
•Vegetated landward tie in
Additional Notes
•Permit plans based on survey 3 days after Hurricane Isaias with 1,000 ft spacing
•Beach conditions still recovering from Hurricane Isaias naturally and through
emergency dune pushing/placement of overwashed sand
•Proposed Unvegetated Beach Areas of Environmental Concern are within
2021/2022 project limits
•Alignment of construction template based on 2016 vegetation line
Conservation Measures
•Construction Schedule –adhere to 16 November –30 April
•Equipment –hopper or pipeline
•Comply with requirements by NMFS SARBO, USFWS Statewide Programmatic BO
•Sediment Compatibility –meets NC Technical Standards
•Pre –and Post-Survey of Jay Bird Shoals to evaluate in-filling rate
•Annual shoreline monitoring of Caswell Beach for 3 years post-construction
•Dune slope design adjusted to avoid sea turtle entrapment
•Maintain 2,000 ft radius around AR-430 and AR-425
Schedule
•October 2020–CAMA Major Permit Modification Submitted
•Spring 2021 –finalize plans and specs; bid project
•Summer 2021 –select contractor
•Winter 2021/2022 –begin construction
Q&A/Discussion
Thank you!