Oak Island Renourishment Project_Appendix D- Stakeholder Meeting Minutes

Oak Island 2019/2020 Renourishment Project
August 7, 2019 2 PM
Town of Oak Island Stakeholder Meeting
Attendees participating via phone: Ken Willson (APTIM), Eric Olsen (Olsen & Associates), Tom Jarrett
(APTIM)
Purpose of the meeting was to inform and request feedback from local neighboring communities and
representatives including, Bald Head Island, Fort Caswell and Caswell Beach, of Oak Island's intent to
request federal and state authorization to dredge approximately 1Mcy of beach compatible sediment
from Jay Bird Shoals and place along approximately 4 miles of oceanfront shoreline in the winter of
2019/2020. A list of attendees participating in person and via phone is provided at the end of the meeting
summary.
Katie Finegan and Johnny Martin, coastal engineers with Moffatt and Nichol, presented an overview of
the project on behalf of the Town of Oak Island, including details of the ongoing offshore geotechnical
field investigations, borrow area sediment compatibility results within Jay Bird Shoals and other areas
investigated, extent and template design of the placement area, modeling results and anticipated
construction schedule. The presentation is provided as a pdf attachment to this meeting summary.
This summary provides a bulleted list of questions and concerns brought up during the discussion:
• What is the expected design template after equilibration based on the absence of a berm?
o Johnny Martin explained the placement template was designed based on the amount of
funding available to build the initial project.
o There is no existing dune remaining within the placement reach due to recent storms.
This project will help build up the dune to provide as much level of protection for existing
infrastructure until a larger project can be funded and built.
o Future projects will include a berm.
o It was confirmed a 14 ft dune was present in 2014.
• Johnny Martin confirmed that Oak Island is aware of concerns of using Jay Bird Shoals due its
proximity to the oceanfront shoreline of Fort Caswell (approximately 1 mile offshore). Delft 3D
modeling of waves and currents was conducted to evaluate worst case scenario if the entire
borrow area template (approximately 2.89 Mcy) were to be dredged.
o Modeling results confirmed highly localized change of tidal currents (0-0.2 ft/sec) based
on instantaneous peak flood tide on the back side of Caswell Beach and along the inlet
shoreline of Bald Head Island.
o Over 86 wave classifications were evaluated based on potential conditions ranging from
normal to storm situations.
■ It was asked how would infilling of the borrow area affect wave heights as
reflected in the modeling results. Johnny confirmed the modeling depicts results
during worst case scenario of dredging the entire footprint and immediate
reaction.
o A request to evaluate sediment transport change along the oceanfront shoreline was
recommended to depict change between existing conditions and preferred alternative.

■ Modeling results depicted a slight increase of 0.2 ft/sec in currents.
• Potential monitoring and mitigation requirements were discussed and ongoing efforts by Bald
Head Island. It was agreed the Town of Oak Island recognizes the need to evaluate shoreline and
borrow area monitoring to evaluate infilling rates and shoreline change.
o A recommendation by Bald Head Island is to include an oceanfront shoreline survey on
Caswell Beach.
o Shoreline sediment transport change rates was recommended to include in the analysis.
• A list of data sources input into the Delft3D model was requested.
o Johnny confirmed a variety of diverse data sources were included into the model to cover
all conditions.
• Concern regarding the distance of the borrow area to the placement area was discussed.
o It was confirmed most likely a hopper dredge would be used but that use of a pipeline
dredge would also be allowed to increase bid competition.
• A request to review the Draft Environmental Assessment.
o Dawn York indicated the Draft Environmental Assessment was still under development
and would be coordinated with the USACE Wilmington District.
o It was agreed that Section 408 would be a potential permit authorization needed by the
USACE.
• Other compatible sources of sand were discussed, including the potential use of Lockwood Folly
Inlet.
o Johnny Martin explained the difficulty of using Lockwood Folly Inlet due to the significant
resources surrounding the inlet, lack of sufficient volume available with current
authorizations, need for widening and deepening, state and federal permit process, etc.
The inlet will be considered for future projects on Oak Island, in coordination with the
County and Holden Beach.
• Proposed dune heights were raised as a concern for access to the beach.
o It was explained that walkovers would be allowed (as were there pre -storm) to
accommodate the built dunes. Dunes will be planted during construction to sustain
material.
• Borrow area surface sediment toxicology composition was discussed based on concern of Duke
Energy outfall pipe.
o Additional information is needed to evaluate the potential presence of toxins within the
Jay Bird Shoals area.

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2019/2020 RENOURISHMENT PROJECT MEETING
08/07/2019 (2:00 PM) - TOWN OF OAK ISLAND TOWN HALL
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• Field Investigations — Vibracores offshore and upland
• Borrow Area — Jay Bird Shoals
• Placement — Extent and template
• Model Results — Currents & Waves in Delft3D
• Schedule — Construction Winter 2019/2020

— Geotechnical vibracoring for sediment compatibility
• Jan -Feb 2019: Nearshore work completed for Lockwoods Folly
Inlet, Eastern Channel, and AIWW Bend Widener
• March 2019: Native Beach Sampling
• Feb -April 2019: Offshore work completed for USGS, Central
Reach, Jay Bird Shoals, and Exploratory Area
• May -June 2019: Multibeam Bathymetry and Sub bottom Surveys
for Central Reach and Jay Bird Shoals
• Aug -Sept 2019: ODMDS and Frying Pan Shoals geophysical,
vibracores to be completed beginning of 2020
• Upland Sites: State and Federal Permission to Access to be
completed later

2,220,000 2240,000 2,260,000 2,280,000 2,300.000 2,320,000 2,340,000
jzl
l:ngiYLAR..A�-.
1*6'p'''
.. Y� . � •r ODD ,
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2.220.000 2,240,000 2.260.000 2.230.000 2.3011.000 2.320.000 2.340.000
Holden Beach
-.i- r Oak Isrand � �, _ ..
Proposed Vibracore Locations - 219 Vibracores Total
D Proposed Vibracores- Zone 1 (53 Vibracores)
• Proposed Vibracores -Zone 2 (108 Vibracores)
• Proposed Vibracores - Zone 3 (58 Vibracores)
" "
t 3 mi Offshore Boundary
-
N
0 8,000 16,000 32,000
Feet

O
2.220,000 2,240,000 2,260,000 2.280.000 2.300.000 2,320,000
2.340.000
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Field Investioations
■ ■
OAK kSLANC Mt1LT1
DECADAL MASTER PLAN
2019 -CENTRAL- 18
OAK ISLAND MULTI
DECADAL MASTER PLAN
2019 -CE NTRAL-19
6A - 8.0 FEET
TOP BOTTOM
OAK ISLAND MULTI
DECADAL MASTER PLAN
2019 -CENTRAL-18
2.0 - 4.0 FEET
TOf� BOTTOM
OAK ISLAND MULTI
j.,111DECADAL MASTEq PLAN
2019 -CENTRAL-18
8.0 - 10, 0 FEET
TOP BOTTOM
i
OAK fSLANO MULTI
DECADAL MASTER PLAID!
2019-CENTRAL-18
4.0 - 6.0 FEET
TOP BOTTOM
■

Field Investioations
OAK ISLAND MULTI
OAK ISLAND MULTI
MC;ADAL MA5TEA PLAN
DECA- W_ MASTER PLAN
2019-JB-08
2019-JB-08
0.0 - 2.0 FEET
2.0 - 4.0 FEET
TOP i3olrTOM
TOP BOTTOM
OAK ISLAND MULTI
OAK ISLAND MULTI
DECADAL MASTER PLAN
DECADAL MASTER PLAN
2019-Ji3-08
2019-.18-08
6.0 - 8_0 FEET
8.0 - 10.0 FEET
TOP BOTTOM `__AIIIIIIM�
TOP BOTTOM
c Ak 1SLANVD MuLTi OAK ISLAND MULTI
DECADAL MASTER PLAN (r-CAr AL MASTER PLAN
2019-JB-08 2019-JB-08
12A - 14.0 FEETAk. 14.0 - T&Q FEET
flop BOTTOM TOP BOTTOM
x
— m ph
OAK ISLAND MULTI
DECADAL MASTER PLAN
2010-JN�-08
4,0 - 6.0 FEET
TOP BOTTOM
OAK ISLAND MULP
DECADAL MASTER PLAN
2019-JR-nA
10.0 - 12.0 FEET
TOP BOTTOM

• Jay Bird Shoals —
Compatible Volume
Estimate
• 2,890,000 cy Available
• 1,030,000 cy of Material
to be removed
• 790,500 cy will be
placed during 2019/2020
Renourishment Project
• Mag Anomaly
CG
13 9 Pa :+i+:8 a r Chan '
stern 13 � 1
F
�9
a
•JB-19
•J13-20 •JB-21 •JB-22 �JB-23
Zone 1ML
JBA4
�j
•JB-18
•JB-01 •JB-02 •JB-03
I
Zone 2
Iso 2
JB-1T
JB-05 JB.06 JB•07.� JB 08
`
Zone 3
II
JB-09 JB-10 JB-11 JB-12
i
26
JB-16 JB-15 JB-14 JB-13
1 5
Zone
Dredge Hecation
Volume(cy)
Volume Including
ft,NAVD88
100ftBuffer c
Zone 1
-26.0
859,720
859,720
4
/,one 2
-31.0
923,979
904,273
Zone 3
-27.0
1,274,863
1,127,400
8
Total
3,058,561
2 891 393
R,y Legend Elevation (ft. NAVD88)
cf • Jay Bird Shoals Vibracores - -29.51 -28 0 -21.99 --20
r u� — MagAnomaly 27.99--26F7 -19.99--18
QJay Bird Shoals Borrow Area
® g --25.99--24--17.99--1fi
x 100ft Ma Buffer
Q -23 99 - -22 - -15 99 - -14
N
0 750 1,500 3,000
Feet
..._, _

2250000 2255000 2260000 2265000 2270000 2275000 2280000 2285000 2290000 2295000
ASTAC WATERWAY (seB a i
ovr n �1 R cash S 0 U T H P O
- --__ - _ o �•• •' 1` t�Q�%Sn-. TANK 1.
�Ont9omery Slough ,Marshl� '- •'IHDP,,RRCAK }' - �SP3RE
o7atik a
` _
_ `_i TANK _ E''v'I flso H6s3Yi �`
O p...._ p.....0 0..-....0-\
s 2ft NI ht)
O
+ CD
+ 1 + Q
p pi - p
TA
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eflt v ,.., �}• � 07 � O i-, O ub
00 O -0. , : Ica"O
O O
2 Proposed Placers? 2 Mz ) ry o o �`. + ,&o, q 1 • ..• ... _�
Area 300+ 500+ 1"� rr� o _ ` _s_ ' °laj i5rab q k Y , -r
00 cv cn * 16 ��
�� 25 fy g •....�... ps r
31 31 33 .325i 4 F1N t 0 ss 29M,. L N© OAK ISLAND
ti011A
21,00 _ 28 Pr 7 \\•�... AsO 52 aM
34 31 20 13 PA c+}r: ,....... 8
Obstn — 27 9 Bar Chan
32 Fish Haven 31 Stern 13 �'16 t
auth mirB ' . 25 13
34 37 ( °rrOwgr@a MaxOBbsrns33 3t \��v�.. 21 1g 14Rk a 5 s�sriaayst��
28
E 37 37 35 34 m�I �sOhi PI aC��Te 27 2 `rd0 11 1s0�2s 23ft �?.
nfgrQa\ �� �1
Obs1n 38 37 35 34 ! 26 15 7
Frsh Haven 37 29
(auth min 20 h) 20 1 ' 1 2 `
2/ 1� I F
37 _ 36 32 31 �.
39 36 `3.7_ — 36
37 S Sh \ f \• :+: % I L/> >Qid �o
34 �•.'26; Obstn 19 19�
40 18'. V/ks
[[Jwuv
cLJJuuu [Lauuu�
{
LLOJUVU LLI VVVV LLl JVuu LLouUVu LLBJVVV LLJuuuu LL�JVVV
Legend
Oak Island Monitoring Transects
Oak Island Jay Bird Shoals Borrow Area
Bald Head Island Jay Bird Shoals Borrow Area
�. Proposed Placement Area 2019/2020
0 2,500 5,000 10.000 15,000
Feet

Placemen

• Model shows dredging the entire 2.89 mcy
17
16
T 15
WN
11
10
692 694 696 698 700 702 704
x coordinate (km)
0 5 10 15 20 25 30 35 40
water depth (ft)
17
ilf
15
14
0
0
13
12
11
10
692
694 696 698 700 702 704
x coordinate —)�
0 5 10 15 20 25 30 35 40
water depth (ft)

• Impact to tidal currents — Instantaneous peak flood currents during a Spring tide
— Negligible impacts
llih6 Existina Conditions
.A
17
�1 , d•.
15
m 14
0 13
12
695 696 697 698 699 700
x coordinate (km)
701 702 703 704
IVA
Difference
696 698 700 702 704
x coordinate (km) —>
0 1 2 3 4 5 6 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
FloodCurrents_FWOP, magnitude fts) (FloodCurrents_JBOpt3) - (FloodCurrents_FVVOP), magnitude (ftls)

• Impact to tidal currents — Residual Currents in a Spring -Neap tidal cycle
— Negligible impacts
17
W.
15
T
a�
m
14
0
0
U
13
M
11
Existing Conditions
695 696 697 698 699 700 701 702 703 704
x coordinate
0 1 2 3 4 5 6
(ResidualCurrents_FWOP) (ft/s), magnitude
Difference
17
IM
T 15
13
IVA
IM
694 696 698 700 702 704
x coordinate
-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
((Residua1Currents_JBOpt3) - (ResidualCurrents_FWOP)) (fUs), magnitude

• Offshore Wave
Climates
• Modeled 86
combinations
of wave height
& direction for waves
coming from
between E and W
Total
in 3
0
W
1.02 2.01 4.98
Significant Wave Height (Annual)
Station 41013 - Frying Pan Shoals, NC
Period 11-Nov-2003 to 30-Jun-2019
N
-I,
NW, NE
20%
L
10% ,
,
1
,r
sW ` y _ i SE
,
i
S
1<
■?15
© 12- 15
E39-12
m6-9
E 3 - 6
00-3
Direction FROM is shown
Center value indicates calms below 0 ft
Total observations 116167, calms 1
About 13.5% of observations missing
Percentage of Occurrence
9.97 8,77 6,42 1.53 . 099 - 0.71 . 0.77 . 0.92
0.21
0.15
0.67
0.14
0.49 0.18 0.29 0.35
0.38.0.53�0.35
0.20
0.11
3.15
0.19
0.37
1.31
2.41 1_00 1,46 1.33
1_41
1.96 :
1,39
0.97
- 0.22
- 0,25
- 0,20
0.21 - 0.24
14,93
-
0.67
1.34
2.99
4.
4.33
.
0.80
0,47
: 0.35
0,42 0.55
0.14
0.27
0.51
1.85
2.24
1.88 :
1.84
1.35
: 0.39
0.19
: 0.12
N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Total
Total
y 3
0
VV
Significant Wave Height (Annual)
Station 41108 - Wilmington Harbor, NC
Period 07-Feb-2013 to 30-Jun-2019
N
NW ' NE
I `
I
L
/ I \
I \
I toaa \ \
� _ _ _ _ I E
i I
� I
� I
l
< <
5W SE
I
_ S
Direction FROM is shown
Center value indicates calms below 0 ft
Total observations 98994, calms 0
About 8.48°%of observations missing
Percentage of Occurrence
0.72 - 0-79 - 1 69 6.22 5.65 8.10 111111 17.72 13.87 13.78 ` 4.01 - 1.27 1.04 0.59 0.75 0.67
0.170.21 0.50
025 1.25 1.48 0-91 020 4.57
0,44 0,58 : 1,15 . 4.43 3.36 1-53 5-17 7.90 7.94 8-38 2-17 0.54 0.63 0.37 0.46 0.40
0.27 0.18 0,40 . 1.73 2.22 6.54 ■ 8.39 4.30 4.40 . 1.62 0.63 . 0.34 0.19 0.25 0.24
N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Total

• IV
• 31
mu-
17
16
15
T
E
Y
14
m
c
oo 13
U
T
12
11

• Waves between 3 — 6 ft 17
• Mean Hs --= 4.5 ft _ 16
15
• 50% of wave conditions14
m
c
o 13
12
11
SW 4.5ft incoming wave
17
16
15
Y
a 14
o 13
T 12
11
694 696 698 700 702 704
x coordinate (km)
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2
(hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft)
S 4.5ft incoming wave
7",�
�rl
�rr�'l�rlrrr�^Irrr����TrVov r4rrr��
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r r�T�T� rrrrrr'T��r�rr� r rrrrrrrr���Trrrrrr rr r =
�-�r�rrrr � rrr r err �
rrT rr,�, T.r 1 rr rT r r rrr r r>r�
�rrrrrr -�
694 596 698 700 702 e 704 SE 4.5ft incoming wavC
x coordinate (km) trrrrrrrr,n `�� � q�
irrrpttPTTtTriT)rrPT
tf rT Tf
-1.5 1 -0.5 0 0,5 1 1.5 2 irTPrt(r T t� T� T rrp(TTTTrr °TrTrTrTTr j�trTl
(hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft) tt Pr r rt pr,Pr 1r Pr Pir1TT rr t 1 tT rr�i
RR t1 rtPt PP 9t)t�rtttP Pt rTtT T 1-tt rr
St t1' PP P PP.P n� 7 r f nT r1 ttr �', r s' � •, + ' -
� � R1 Rr� tttr �tf rf rfr;Pjr tirrtrrr�P .t ��
14
Ca
R RR?S tR prPhFrPp PTTPPr1� �f,� t
R R t P RPrPtPrrr .P�..,rTprrr�
RR Pry Rr 1pPPP prrPrrr,til�ti�,, r
rrrrrrr��ffrPffr,S�,,�
0 13 2� i�RtirrPPrrrrrrlP{t P fr r11it t� , rr ,
rRRrt rtR � rrr rrt r rTr�rr>� �t, �� r
a ERR RRr rRR� Rt rrr rrr ( ,t�,, t, r
R2r RTt Ttr �t rrr rrr r�{tr,
12��� R T�gTTTR���gfRrrrR�rrfrRrzrrrrr� ,�,t1,t r rt rt q
RrrRRRrrRR�rRRR't��t�r't1T1
��R�iRRR�f��1��1r�q��trrPtT't :I
����� 1��s rr ����T�rr r�rR r rr tP rP rr,.
tTR tq, rR1 rr .rPr, _,_.,
694 696 698 700 702 704
x coordinate (km)
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2
(hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft)

• Wave between 6 - 9 ft
• Mean Hs -= 7.5 ft
• 15% of wave conditions
SW 7.5 ft incoming wave
a . Fpp1 P A ..+�A lT✓"_ as �N r
S 7.5 ft incoming wave
694 696 698 700 702 704
x coordinate (km)
-2 -1.5 -1 -0.5 0 0,5 1 1.5 2
(hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft)
fi
� a? 14
2 j
0 1312
R 4
694 696 698 700 702 704
x coordinate (km)
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2
(hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft)
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694 696 698 700 702 704
x coordinate (km) �
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2
(hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft)

• Waves>= 18 ft 17
• 21 ft waves seen in 16
15
T
Hurricane Matthew m14
• < 0.21 % of wave conditions T13
12
SW 18 ft incoming wave
17
16 rr�rrrP�1 P�PfPP �p f>� f p p1r' �T
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T 15
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14
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11
694 696 698 700 702 704
x coordinate (km)
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2
(hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft)
S 21 ft incoming wave
694 696 698 700 702 704 SE 2 1 ft In
x coordinate (km)
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2 -1.5 -1 0.5 0 0.5 1 1.5 2}1 1 j }11P1} rrrrrll'11 �1
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y
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1 r
tr
,rat
694 696 698 700 702 704
x coordinate (km) �
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2
(hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft)

• Modeling— Summary
— Modeling showed dredging entire 2.89 mcy
— It is expected that some infilling will occur between dredging events
— Offshore wave heights in Frying Pan Shoals less than 6 ft account for 80% of wave
conditions
• Model results showing about 3 inch increase of wave heights mostly east of the site
— Offshore wave heights in Frying Pan Shoals between 6 — 9 ft accounting for 15% of wave
conditions
• Model results showing about 0.5 ft increase of wave heights on both sides of the site
— Storm wave conditions >= 18 ft such as Hurricane Matthew
• Model results showing no more than 1 ft wave height increase on both sides of the site farther offshore;
and less than 0.5 ft wave increase close to the shoreline

Schedule .1 11
• August 2019 — CAMA Major Permit and Draft EA Submit
• November 2019 — Bid Project
• January 2020 — Begin Construction
• April 2020 — Finish Construction