202010_21_22_Scoping Mtg_final

71
may`
rA
THE TOWN OF OAK ISLAND, NORTH CAROLINA
J"1_1-4-11 Ld i

• 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

d O O o p -IOO 0 0 0 :O 0 0 _a O G 0 0 0 0 0 p 0 Oi�O "'O esdI I iQ O _
+ }+�+ + s}}} }+ }+ + } + } } } } } }}},+:;0 6 p o 0 0 Oa Is an Caswe Beac
0 0 O�10: 0 0 0 0 0 O 0 0 0 0 0 0 p. p d + } O p
o Oa0 O f- "o u'1 �. M N O O,R'c0, 1� b .0. O .
�- � V1 iI] �[, � v: iC1..Q '�. V tO V)' .�� M N .O p � } O
o 7 �
N ,tl
19,zz0 cy 1,z7o.00Q
22.713�5 l f y
cy 410 S7 I I I I� I� f 1
29, 00 c cY 7,930 cy 1 1 ! 12,�650,000 y
2.S03 cy c
Y IJ
23,17 Y 509,000 c. a'
0 c 3B6 y' 54f7,000 cY I
95,886 cy 000 cya� 1,
605,000,c 1� �133 Q0(
640,300 c Y f �2��q0'Q ,
S11,300 c �
Y
128,000 cy
Legend {
�► 2001 Initial Construction New 44' Channel
2001 Sea Turtle Habitat Restoration
2009 Lockwoods Folly River Crossing
2009 Wilmington Harbor Maintenance Dredging '
2015 Lockwood Folly Habitat Restoration
2017118 Hurricane Matthew FEMA Emergecny Dune
'f I
2018 Wilmington Harbor Maintenance Dredging
4-0- 2019 AIWW Crossing
Aerial Imagery: NAIP 2016
0 6,000 12,000 Feet "' f
ti i

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)
0 Addition of Central Reach borrow area (west end cost savings)

OI
�\
FS.
711
f
� 2270326.89
EN227032o
•� 'w
�
q
�I
C
MfCfS
� ml
—
71
\�
9
s
\`
.00' I
JAY BIRO SHOALS
BORROW AREA,
SEE SHEET C-119
OCEAN
ARTIFICIAL REEF,BORROWAREA,
ZONECENTRALREAOH
SEE NOTE 3
SEE SHLLT C-120
kE
q7EATLANTIC
w
BNOTES:
AR430N "676.98ARTIFICIAL
REEF,
1. OFFLOADING STATION ATEEACH NOURISFNENT SITESSHALL BE USEDTO
- 22330Q3S2SEE
NOTE 3
PUMP DREDGED MATERIAL ONTO BEACH. THIS STATION SHALLMOVE EAST
OR WEST AS THE NOURISHMENT PROJECT 15 COMPLETED DREDGED
b
MATERIAL SHALL BE TRANSPORTED Y BY FROM THE BORROW AREA OI RECTL
THE URLDGL AND OFFLOADLD AT THIS LOCATION. CONTRACTON SHALL
=
A
PROVIDE MAP OF PROPOSED OFFLOADINGS STATIONS AND PIPELINE IN
ACCORDANCE WITH PERMITS, SEE TECHNICAL SPECIFICATIONS_
E
2. PO TEN7IALPLACEMEN7 AREA PREVIOUSLY PERMITTED UNDER CAMA131-20
TO INCLUDEAPPROXIMATE FILL LENGTH OF 6,300 FT AND FILL VOLUME OF
1I5,000 CY, THE VOLUME ASSOCIATED WITH THIS PLACEMENT AREA IS NOT
INCLUDED IN THE TOTAL PROJECT VOLUME FOR THIS PERMIT MODIFICATION
REQUEST,
S. 2JOW FOOT Bl1FFER FOR PLACEMENT CIF ANY PROJECT EOUIPMENTAROLND
ARA25 AND AR330,
A
a�ur zcaa
SCALE: 1'=a100'
6 ee
FOR PERMITTING
Ralererc N.
ISSUED'. 202D-OB-25
G-W4
NOT TO BE USED FOR CONST UCnDN
2
3
4
5 8

Temporary changes or defects in aids to
Gard Light List and LJ.S. toast Pilo! Icr details.
navigation are not indicated on this chart, See
r
Local Notice to Mariners.
i
INTRACOASTAL WATERWAY CAPE FEAR RIVER
Use chart 11534. The depths and channel The project depth is 44-3a feet to Wilmington.
markers are not shown hereon. For controlling depths see Chart 11537.
BRUNSWICK COUNTY '
'J
Airport
rNTRACOAS TAL WATERWAY (5ae
---
hotel
CAS
o�
�e11 5 Pt
__
Olrfte PON
anlnran:an
4,o Oak Island
4Mazsn'
_-
"tgomery Stough +
J -
(STANK oTar1<.
--`-- _
TANK
.
......
,--.
-
= a
Q
— -,
:ame exposed, Moaners sho:Jld use extreme
iticn when operering vessels in depths of
ter comparable to their draft in areas where
)eiines acd cables may exist, anal when
shoring, dragging, or trawling,
Cnvered vaa'fs may be marked by lighted or
O S0UTITPC
GA, r e�. r
TRNK
N '`Y rs4 fi 6S 39rt (((NaYI k I p��>�Q
Ci 9 Iso H 6s 42f[ (Night) � � b 5?
�a Potential Placement Area 460+00-- 500+00 + ! t 5 `''r c� m O is - Fr ""'�U1N q �, � • s
1 2FN v� O- y" *.... r41'0s
31' F 2Under CAAA #31-20 �`�- Pr s�sn . qv r �N� \ !�.: �rr24y�, 'oAKlsrNa rotin
for �J net % ,. sM 32 �opoSed.P \17 ""` r _.... C�--«Szo°�"r
\` ..
P 34 Obsir ,a._.,meat � 13 sPA:i+:�er g4 �f
O 31 CL s g
32 Atee M 31 nf-feven3 31 31 'Areaz70+00 _ `�. \� Stem- Ct1an _ ;\ts-�-�
34 31 d�Ir4RS 34 Borroyy'Area'Max 11]..zs: 31 \� 25 30pr00 +1�g 1s� fi sort
21
33 fp0 37 ties fr `-- -, 14% l 5 3 st%0a
32 33 NO-DfSCN33 Mo32 34 ace a 29
.3l I 3` M om Placement Aria 2 nd 11 ISO gs 23[f`�2?.0 G
34 34 (SI?C R 35 tgred `:o_. 31
h
I
33 ' Obstn 38 37 25 34 26 51 ` r 1.:
S Sh Fish Haven 3 20 r
35 35 35 (ai min 20 ft) 29 - 236 F 1
32 _ 21 �� 4 6l
3; 3 �T 8
36 37 s 39 Federa��3tate-Waters Boundary ssn
s
S tih 3` :29,.� 34 \;2fiiObs7r 19 1g 11 25s l S1
39 `.18t Wks 17 20 T1'� 110
33
Legend 4C :.2a: 37 39 \� 32�
35 31`
Oak Island Monitoring Transects 40 /� iv24.'
f z
Oak Island Jay Bird Shoals Borrow Area 3s 4Q 3s ssh 33 a7 34,E 5 FIR
2.5524
Bald Head Island Jay Bird Shoals Borrow Area 42 34
35 28
36
Oak Island Central Reach Borrow Area 39 F1G2. L 40 40 4d Rk 42 37 40 2 V
Holden Beach Central Reach Borrow Area n 39 39 36 A s
N 42 S Sri Co 39 38,:y �/ r` �\ `� Ff R 4s
0 0.5 1 2 3 4 39 37 ` a�� �" Cy 35
Miles 42 38 37 i/ „�,5-\37, Ia'\ ss
25 30 �G 4s
39 Dump site \ \
45 43 3 (dmdgea mare* \ \ `

2284000
2z
2292000
• 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
1 -28.0
-26.0
2 -37.0
-31.0
3 -29.0
-27.0
7 .+I-F CG
•i" •"w
1 9
PA r Chan
9 13
S t e
13--
19
2(
Zane 1 8
is-20 JB-21 JB-22 JB-23
. F 0 1D
JB-01 JB-02 JB-03 JB.04
0 • }`
JB-06 JB-06 JB.07 JB-08 i
Zone 3 1
JBA9 JB-70.. J8-11 JB-12
• 15
JB-18 JB.15 J8-14 JB-13
Zone
Dredge Elevation
(ft, NAVD88)
Volume [cyj
Overdredge Elevation
(ft, NAVD88)
Volume {cyj
Zone 1
-26.0
858,209
-28.0
1,154,975
Zone 2
-35.0
1,555,584
-37.0
1,870,282
Zone 3
-27.0
1,275,617
-29.0
1,645,805
Total
3,689,410
4,671,062
d
Is0 2
1� 9
7
e
4
T� = Legend Elevation (ft NAVD88)
_ / 3 29.51 - -28 • Jay Bird Shoals Vibracores 21.99 - -20 � - � -
Marine Debris
,I. -25.99--24 -17.99--16
Jay Bird Shoals Borrow -
-23.99 - -22 - -16.99 - -14
0 750 1,500 3,000 "
Feet

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
t00
80
1z
20
I I 1 I I
I I Y I I
I I 1 I I 1 I
1 1
I I 1 I I 1 I
I I 1 I I I
I I 1 I I I
---------_-_a__1------- -----_ I------- _----------------------- -----------------
I _ 1 'I' 'I- `I
I I 1 I I
I I 1 I I I I
1
1 I
I I I I I � fff I I
^I sn snr O O 1+ to ry w
•'f 1 n nO�sO O Q O�*
II pry I .n,+l �n N �w N ew r-* N 1-q N N +V N+-I rlr1 rrl rl rl rl - rl T T R} n h'� �A If'S � nyiv
I �-
1
I I 1 I I
I I 1 I I . I �
I I I I I i I
1
I I 1 I I I
I I 1 I I 1 I
I I Y I I 1 I
I I Y I I i I
I I I I I I I
------------- --;---------------
I I 1 I I 1
I I
I 1 I
'
I 1 I
urvey rdrlse S
`---I------ -r-------_.---_----
Jai+ Nrd Shoal borrow Siik!
—Transport Gradient - Existing
I 1 Y I I
—Transport Gradient - Aftcr-Drcdgr Template 1 I 1 1 _i________LI I
I 1 1 I I
I 1 1 I I
—Transport Gradirnt-After-❑rrdgrTrmplatr 2 F
45919W 69zow 6930M 694000 595WO 6960W 597000 698000 699U00 7GV000
Easting- NC State Plan (m)
Wave Anduced Iongshore sediment transport gradients along Caswell Beach shoreline
701000

Borrow Area — Jav Bird Shoals
OAK ISLAND MULTI
LILC:AUAL MASTEF9 PLAN
2019-JE-08
0.0 - 2.0 FEET
TOP BOTTom
OAK ISLAND MULTI
VECADAL MASTER PLAN
2019-JU-08
6.0 - 8-0 FEET_
TOP BOTTOM
OAK ISLAND MULn
DECADAL MASTER PLAN
2019-JB-08
12A - 14.0 FEET
TOP DOT -Tom
- -::..
OAK ISLAND MULTI
pEG4E7AL MASTM PLAN
2019-J113-08
2.0 - 4.0 FEET
TOP BOTTOM
-AW
OAK ISLAND MULTI
QECADAL MASTER PLAN
2019-JR-08
8.0 - 10.0 FEET
TOP BOTTOM
CAK ISLAND MULTI
r»rAr)At MASTER PLAN
2019-JB-OS
14.0 - 1£.0 FEET
TOP BOTTOM
■■ N E M m m m•m ■
qv--m
OAW ISLAND MULTI
oi_GAOAL MA5TEA PLAN
2019-JIB- 0 8
4.0 - 6-0 FEET
Top BOTTOM
OAK ISLAND MULTI
DECADAL MASTER PLAN
2019-JR-nA
10.0 - 12.0 FEET
TOP BOTTOM
�.�..—

nth �►� } 9 f � �, [ +� !;� � �'.� \ .
J B-22
J B-21 a� x � t - - - = ZONE 1
Zone 2
J B-2 �iT�• ��'�• N ft ', ."' ._ '� .-ter- -
r
avg. JB-18�.7
JB-17 ` `°L: h ZONE 3
LE
L26' L26
�J B-13�
JB
-1 2m
VJ
' , > (. , ' `may �•
�� " J '� ` - �` - �{, 5 yr• S,�`f t ,�, r y�i ,°i �b''�e�y� � } T ;
�I � �� �`��� `�"� �i4'Ri► a ,y S to "y' � ,1°' �, �..�`�. x = { j� �s `X • `1 �tT� �r f" 3s �;y.:. t ' r J �� ��• e f's� �j'-���..4 '; p4�Z
" � 7� 4 �i�. 1�. -/� ` ^hYy�� i. �� �•`� ft Y i ���{k� YZ p�
Zone 2
avg .
9.8
J B 01
.1

• 1.2 mcy w/ +2 ft OD
• 615 kcy w/o OD
1:1 -<1
• AR — 430
425 aSNMI
Legend
• 180 acres
o Oak Island Vibracores
Central Reach Borrow Area
Holden Beach Central Reach
• Cost savings for
AR430-buffer
Hrgh 6
41.430.34
Low : �1.4304
west end
° 5°° 1Aon z.°°°
placement
Feet
1 inch = 1.000 tees
n
_
41
5
Notes'.
Coordinate System, State Plane NAM
Town of Oak Island
Permit Modification
Borrow Sources.
Map Scale_ 1 in = 1,000fl
1/11
Moffatt & nichol
Moffatt a Nkhm
4700 Fags of Ne Rd. 59tte 300
RWl gh NG 27609
219-781-4626
rmw.rrwHalh+icAd.cwn

Borrow Area — Central Reach
OAK ISLAND MULTI
DECADAL MASTER PLAN
2019-CENTRAL- IS
0,0 - 2.0 FEET
TOP BOTTOM
OAK ISLAND MULTI
DECADAL MASTER PLAN
2019 -CENTRAL-18
6.0 - 8.0 FEET
TOP BOTTOM
L
ISLAND MULTI OAK ISLAND MULTI
DAL MASTER PLAN DECADAL MASTER PLAN
-CENTRAL-18 2019-CENTRAL--10
2.0 - 4.0 FEET 4.0 - 6.0 FEET
BOTTOM TOP BOTTOM
OAK ISLAND MULTI
DECADAL MASTER PLAN
2019 -CENTRAL- 18
B.0 - 10. 0 FEET
TOP BOTTOM
■ ■-■IM■■
- Y..

�Ce�nt—ral-18
Central-16
Zone 3 av .
Fcentral-15
i Central-10
Central-09
ntral-0
Zone 1
avg. 1.7'
ntral-07,
Central-01
''�'* ,�� � �`'. �ti �' _ } tF-.s• �/���� � �'a 4��' .,Fdli. ti � ..>r%x�"r� _ ,�.. � 4 e ,, y �V� Ji
Yip, � - - ,� -�-3i \ +y1r2►ry -'� 4..,er-s.v�..� ,
tie
OWN
Mi ��..9+�t, +►'d', y#`�a �.. � f . � r � rT � ". � - 1' � �(1: `i. � �1� �`• '�7t
w�- l,. M. ♦ s ' /{1 �.Y• !' firr y3R itXi ar �•� aL -
�'�`�' 3� I, � ' Y ��y�� S' � 't+"fir y - s.r . � � t .t' k F �i �+ �� � 4~�Mr-•c�b �' „� i ' 4.� ii
�+ F
/34
-.e.r rf ,-f r -r r �-� �. ,4 �.—�. � }��.4��_°a Li,�,•,:' ♦ `rt�{ .Ls�V� � 1y�i,�� 1r: ,y
M rim
• i�. t 4i' if {'� � _...' . �.,,.. as i �-•-- JAY �� i,S! �- - - - � ��4 -
°�; 'F• _ `` �gz. 'ate;%'rc--.av{'s if1`��•4fi$ ,.,, `" M 'n' '�
A`'ii _ .. sue. !FA r - 4 - �'-1�,'..A � r.:.�r�- � r:. .1♦
VV
r
f
y
t
'_IJ! 1
WNE .2NE 3
ZONE A
a r,

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)
All dry colors for vibracores meet recommendation of 10YR-5/1

• Template designed for 25-yr return •Dune slope will break at 7 ft NAVD88 and
period storm event continue out on a 20H:1V to tie in
• Dune crest width 10 ft •Some areas have flat berm 15 —120 ft wide
• Dune crest elev. b/w 13.0 ft -15.5 ft (meet minimum construction fill
NAVD88 requirements & hotspot placement)
• Planting to occur on dune back slope and
• Back dune slope 5H:1V
crest
• Front dune slope 4H:1V
so-
20-
to-
J
CANTING OCCURS ON
yREST
& BACK SLOPE OF DUI
DUNE TOP EL 13.0 TC
15.0
DUNE WIDTH 10.0'
�r DUNE SLOPE
BREAK EL 7.0
2D,7 EXISTING
�N1HW 1.8'
GROUND
M LV/ -2.9'
-111-1
0+D0
2100
3100
4,00
-30
-20
-I 0
10
5+00
STA 501 +00 TO STA 620+00

so o
E E aR
S
0 o I z. o t s.a• swe
STA 210+00 TO STA 235+0C STA 501 +00 TO STA 620+00 SECTION
o+m I s+m saau a+m 5 0 �
= 5
D1 SECTION D D3
IIALI Nore cs® rce ns xoTEO
D D
f
¢9
bg °
o m UC�
g
a
C C .` E
1 a
a I+ 0 2.m awo a e«m o t o
STA 62D+00 TO STA 647+00 & STA 669+50 TO STA 665+50
STA 235+00 TO STA 275+00
C3 SECTION
C® SECTION taus scW s As xoreo S e $ 3 a i
8 B e5
RO 9 POD
_ n
U q
I 0 1 0
E s
-I 10 -I 10
10' tr ID' fp y�
A VERTICAL SCALE: E--ft A &
a 1 �+ a«m 4 0 0 5« o. a 1 �• a o a. 5 0 v ��
STA 275+00 TO STA 295+71 STA 647+00 TO STA 659+50 & STA 665+50 TO STA 676+34 HORIZONTAL SCALE. 1-10
sneeL
Al SECTION A3 SECTION FOR PERMITTING flea"`a"
CS09 SCALE AS NOlEO G9W SCALE ASNOTEO ISSUED: 2020-09-25
fl CONSTRUCTION
2 3 C.3D$
NOT TO BE USEp FO
'lulIn
l OP EL 14.5 TO 15.0
_ WF
PLANTING
CG11R5 ON CREST
&BACK SLOPE
OF DUNE
�
BERM 6L0
EBREAK EL 70
Ex15TIN
GROUN
YMHW 1.8'
YMLW-2.9'
PlAN71N
OCCURS ON CREST
& BACK
S OPE OF DUNE
DUNE
OR EL 14.5 TO 15.0
DUNE
DFU 10 0'
b'
BERM SLOPE B
EL � 0
\ �>
BERM
OPE BREAJ( EL ] 0
EXISTEXISTING_
1
GROUND
YMHW 18'
55'-0'
TING OCCVRS ON
REST
BACK 6LOPE OF DUN
DUNE TOP EL I3.OT
15.0
ouNE WIDTH io o'
h
ti
xy
DUNE SLOP
BREAK EL 7.0
\
�-1 Exl
TWG
MHW18'
\
cR
uxo
Y
�
Y MLW -3.9'
LAWTING OCCURS ON,
ES7
BACK SLOPE OF DUN
TING OCCURS ON
REST
BACK SLOPE OF DUN
DUNE TOP EL 130
0155
WNE WIDTH 10,0'
bh
BERM
SLOPE BREAK EL 7.0
i
;y
BERM
SLOPE BREW: EL TO
ExIsnNG
�
1
GflOUND
YMHWIB'
API
MY
I.NJDW
TIE-IN El
D 1�,
LW _29'

• Western 800 ft of project
• No new dune creation
is Vegetated landward tie in
Legend
a Oak island Survey Baseline
— Oak Island Survey Transects
—Development Line
pinA ur
Aerial Imagery' NAIP 2014
11 220 aao'
Feet
iS
ib
14
12
1Q
4
2
0
PL'�
_ o
�• er
2
F
+g
-10
I
-i2
-14
-16
oL
-2a
-20
J
i
674+00
-100 -50 0 50 100 150 Z00 250 3C0 350 400 450 500 550 600 650 700 750 800 850 900 950 1000
r tance from Baseline (�tp
—Str4CWr 2018 — PoSt Florenge 2019 — PoSt Dor4n 2020 PoSt Isaias ----- Con$tr4Ct;4n Template

• 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

• 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

• October 2020— LAMA Major Permit Modification Submitted
• Spring 2021 — finalize plans and specs; bid project
• Summer 2021 — select contractor
• Winter 2021/2022 — begin construction