21_22 Oak Island Nearshore Survey_groundtruthing samples

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TI Coastal Services, Inc.
C 20'W
387-B N. Green Meadows Drive
W 24'
Wilmington, NC 28405
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910.821.1358
28'
>30'
OAK ISLAND HARDBOTTOM SURVEY
Town of Oak Island
Brunswick County, North Carolina
NEARSHORE INVESTIGATIONAL SURVEY
Survey Location and Drawing Layout
Now
Additional Notes:
1. Area denoted with dashed line indicates areas where further methods of investigation
(i.e. Ponar grab samples, divers) has been recommended based on side scan returns.
2. Ponar grab samples performed July 13, 2021. Sample locations indicated by blue
circles and labeled as GS-##.
3. All ponar grab samples returned evidence of silty and or sandy material. No physical
evidence of hard bottom was discovered.
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Graphic Scale
0' 400' 800, 1600,
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Scale: 1" = 800'
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1. Horizontal Datum: NC State Plane - Zone 3200, NAD83 (2011), Survey Feet
2. Vertical Datum: NAVD88
3. Data collected by TI Coastal between June 16 & 18, 2021 and represent conditions at
that time.
4. Soundings are expressed in feet and tenths.
5. Single Beam bathymetry collected at 200 kHz on survey lines spaced 120' apart.
Contours are generated from a DTM model of the soundings at 1ft interval.
6. Side scan sonar images generated from data collected at 1600kHz (High Frequency).
7. Station lines from vearlv monitoring survevs.
DWG NAME: 2021_Oaklsland Hardbottom Inves w Samples.dwg
DWG DATE: July, 15 2021 SURVEY DATE: June 16-18, 2021
SCALE: 1" = 800' SHEET: 1 OF 6

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30J 30.4 30.5 30.3 30.4 30.2 30,3 30,6 30.T
30,5 30,3 30.4 30.4 30,5 30,3 30.3 30.2 30.2 30.3 30.2 302 30.5 30.1 30.6 30.2 30.3 30.3 30.1 30.5 30.3 30.4 30.4 30.5 30.6 30.7 30.4 30.6 30.4 30.7 30.6 30.7 30.5 30,6
30J 30.3 30.5 30.4 30.5 30.5 30.4 30.4 30.2 30.5 30.2 30.3 30.8 30.2 30.5 30.2 30.4 30.3 30.2 30.5 30.5 30.5 30.5 30.6 30.6 30.7 30.5 30.8 30,5 z0.8 30.6 30.8 30.6 30.6
30.7 30.4 30.5 30.4 30.4 30.4 30.6 30.4 30.4 30.6 30.3 30.3 30. 30.2 30.5 30.3 30.5 30.3 30.3 30.5 30.6 30.6 30.6 30,7 30.7 30.6 30.9 30.7 30.7 30.9 30.7
30.7 30.4 30.6 30.6 30.6 30.6 30.4 30.5 30.3 30.3 30.6 30.4 30.6 30.5 30.3 30.5 30.5 30.7 30.7 30,8 30.6 30.8 30.8 30.9 30.6 30.9 30.8 30.8 30.9 30.7
30.6 30 7 30,6 30.8 30.4 30 7 30.7
30.7 30.5 30.6 30.6 30 7 30.7 30.5 30.5 307 30.5 3 .4 30.8 30.5 30.5 30.5 30.5 30.3 30.5 30.6 30.5 30.8 30.6 30.9 30.9 30.8 30.8 31 30,8 31 30.9 30.6
z 30.5 30.6 30.6 307 30.5 30.7 30.5 30.6 3p7 30.5 3.5 31 30.5 30.8 30.6 30.6 30.6 30.6 30.7 30,6 30•8 30.6 30.8 30J 30.9 30.9 30.9 308 30,9 30.9 3±: 30.7
1 N 30.6 30: 7 30 7 30.7 30.8 30.6 30.6 30 7 30.6 30.8 30.4 30.6 30.5 30.6 30.6 30.5 30.9 30.7 3�„ 30.6 30.9 30.6 31 30.9 �! ± I g30'7 3, 31 31 si•i 30.9
31 30,8 30.9 30.7 30.5 30.8 30.5 30.7 30.7 3.6 3,1 30.6 30.7 30.5 30.7 30.8 30.7 308 30.7 309 30.9 31 30.9 31.2- 31.2 31.1 31 ji 31
30:8 30.9
30.8 30.�,8 30 9 30'7 30.8 30,7 30.7 30.9 30.7 3 J 31 30.6 30.9 30.6 30.9 30.8 30.7 1 .2 ". 3+ 30.8 30.9 31.9 30.9 31.3 I3J;c 31.3 31.2 si 3;
0. 30.9 31 30:9 30.9 30.9 30.8 30.7 31. 30.8 30.8 31 30.8 31+• 30.7 30.8 30.8 30.6 30.9 31 31 31 1 31 31.1 31,e 31.2 31.3 31.2 31,1 313 g
31 30.9 30.9 3t 30.8 30.9 30.8 30.7 3:.1 30.8 ?±± 30,8 30.8 31 31 J1 3± - 31 30 31.2 31.4 31.2 31.. 31.4 31.2 31.2 31.2 +n9
L/ v 30.9 31 31 3i:2 30:8 31.1 30.9 31,4
30.9 '-' ?' °1--' 3i 30.9 31 ?11 30.9 30.9 31:2 30.8 -'t 30.7 s1.2 31 s11 s1 31.1 31.1 3112 31.4 31.3 31.4 31,2 31.2 31.4 31:1
30.8 3B 4 31.1 31.1 31,1 30.9 �: si.l 30.9 30.9 31.2 ?0,9 31 30.9 31.2 '-1 ! =' 31.1 31.4 31,2 31,3 31;2 31.4 31,4 31.5 31.2 31.5 31,3 31.4 31.5 31:2 rl Y
31.1 31.1 _ 31 sU 9 31.2 31.1 31.3 31.3 31.3 31,4 31.4 31.5 31.5 31.3 31.4 31.2 31.3
r11 31.2 31.1 31.2 31 31' 31.3 31 31.4 3 1� ' 30.9 31,4 �: 31.3 31.3 31.6 31.6 31.6 31.6 31.3 31.5 31.3
?^ 3 31.2 31.2 31.2 31.3 31,i 31,1 31 3+•1 M4 31.3 30.9 31.2 31.1 31,3 31,3 31.5 31.4
31.3 31.3 31.5 3~ 31.331.3
31.2 ' 0.9 31.3 31.3 31,2 31,3 31.3 31.1 31.2 312 31 31.1 317 31.2 31,2 31.1 31.4 31.. ?. 31.4 31.1 31.5 31,4 31,3 31.2 31,6 31.4 31.6 31.6 31.7 31.6 31.6 31.5 31.
31,3 l 31.3 31.3 31.3 31.5 31.2 31.4 31.4 31.3 31.2 31.6 31.2 31.4 31.c 31,4 31.3 31,2 31.5 31,2 31,4 31.4 316 31.6 31.6 31.7 31.6 31.6 31,5 31:4
31.3 31,1 31.3 31.3 31.3 31,4 31.5 31.2 31.4 54 31.2 31.2 31.6 31.2 31.4 31.4 31.6 31.3 31.3 31.7 31.6 31.6 H3 31.6 31.5 316 31.6 31.6 31.7 31.7 31.6 31.6 31.8 31.5
31.3 31.1 31.3 31.3 31.4 31'4 31.6 31.3 31.5 31.6 31.3 31.3 31.6 31.3 31.7 31.3 31.6 31.4 31.5 31.4 31.4 31.7 313 31.6 31.5 31.6 31.6 3.7 31.8 31.9 31.6 31.8 31.8 31.6
31.3 31.2 31.3 31.2 31.5 31.4 31.5 31.5 31.4 31.6 31.4 31.3 31.6 31.1 31.6 31.3 3116 31.4 31.3 31.5 31.5 31.7 31.5 31.6 31.5 31.8 31.7 3.8 31.8 31.9 31.7 32 32 31.5
31.3 31.3 31.4 31.6 31,6 31.5 31.6 31.3 31.7 31.4 31.5 31.5 317 H4 31.7 31.4 31.7 31.5 31.3 31.7 31.4 31,9 31.7 31.6 31.8 31.8 31.8 31.9 31.6 K 31.7 32 32 31.8
31,5 31.4 31.3 31.4 316 31.6 31.6 31.3 31.6 31.4 31.6 31.7 31.6 31.7 31.5 31.4 31.7 31.5 31.9 31.7 31.7 31,8 31.8 31.8 31.9 31,6 32 32 31.H 31.8 31,8
31.5 31.4 31.4 31.3 31.5 31.7 31J 31.4 31.6 3117 31.4 31.6 31,8 31.6 31.7 31.6 31.7 31.6 31.5 31.8 31.5 31.9 31.8 31.9 31.9 31.8 31.9 31.9 32 32 32.1 31.9 3a 31.7
31.4 31,4 31.5 31.5 31.6 31.6 31J 31.6 31.6 31J 31.6 31.5 32 31.6 31.6 31.7 31.8 31.7 31.5 32 31.6 31.9 31.9 32 3.9 32 32 319 31.9 ??.± 32.1 31,9 31.9 31.8
31,6 31,5 31.7 31.7 31J 31.6 31.7 31.8 31.b 32 31,9 2 9_ ^+r 32.1 32.1 � 31.H
i 31.7 31.8 31.5 31.7 319 31.4 31.6 31J 31.8 31.6 31.5 31.8 31.6 31.9 32_ .i 3i.9
31.6 31.5 31.7 31.5 317 31.7 31.9 31.7 31.8 318 31.7 31.7 3a 31,7 31.9 31.7 31.9 31.9 31.7 31.8 31.9 ?24 31.9 Ii3i'y 32.1 ?a 2.1 32.3 32.2 32.1 32.1 ?? 1
31,6 315 31.8 31.6 31.7 31.7 31.8 31.8 31.9 31.6 31.7 ?a, 31,g $.i 31.8 322 31.9 31.8 31.9 31.9 32.2 sae 3a.1 31.8 32.2 32.i 32.2 32.1 32.5 32.3 32.2 32.4 3-
31.8 31.7 31; 32.2 32 32.2 32.1 32.2 32.3 32,3 32,3 32.3 9
31.6 31.5 31.7 31J 31.8 31.7 31.7 31.9 31.9 31.9 31.6 31.8 32,2 31.8 '2 31.8 32 31.7 32 a _ 32.1 s2,i 32.2
d 31.6 31.6 31.9 31.8 31.8 31.8 31.9 31.7 31.9 ?2.i 31.9 32 72.1 31.8 32.1 32 32.3 32 32.E 32.2 32.2 32.3 r 32.4 32.4 32.4 32.2 32.2
31.6 31.7 31.6 31.9 31.8 31.8 31.9 31.8 31.8 32- 31.9 32 3 .2 31.8 3L 32 32 E T 31.9 32.2 is 32.4 32 32.3 32.1 32.3 32.4 32.4 I 32•}, � � 32,4 32.2 32.4 1
31.6 31.6 31.7 31.8 318 31.9 31.9 32 31.9 31.9 32 32 32.2 72 3e sc.i 381 31.8 32,3 21 32.3 32.2
31.8 31.6 3n5 31.8 31.9 319 y. 2.' 31-� 32,3 32 32.i 32 32.2 32.1 3? 32.3 s'..^• 32.3 32.3 Additional Notes:
f {. 31.9 318 331.9 31.7 2.4 322 31.2 32.4 32.3
32 a7 a _ _ sal 32.5 32.1 32.1 32,+_ 32.4 32.2 32.2 32.4 32.1 32.4 32.4
3i.o 32.3 32.3 1. Area denoted with dashed line indicates areas where further methods of investigation
32 31.7 33.1 32 3c va 32,1 ' i 32.5 32.2 32.3 32.1 32.4 32.3 32.2 32.5 32.5 32.5 324
3.1 321 32:2 321 32.4 32:] 32.3 32.3 32.6 32J 32; (i.e. Ponar grab samples, divers) has been recommended based on side scan returns.
2. Ponar grab samples performed July 13, 2021. Sample locations indicated by blue
circles and labeled as GS-##.
3. All ponar grab samples returned evidence of silty and or sandy material. No physical
evidence of hard bottom was discovered.
!' N 0
IEE�. +
N
W
N
W
N
W
N
N
W
W
W
W
W W
COLOR CONTOUR
LEGEND
<0OAK
ISLAND HARDBOTTOM SURVEY
Notes:
1. Horizontal Datum: NC State Plane - Zone 3200, NAD83, Feet
2. Vertical Datum: NAVD88
co 4'
3. Data collected by TI Coastal between June 16 & 18, 2021 and represent conditions at
>>
Town of Oak Island
that time.
O a s a
1­4TI'�1
W Z 8
Brunswick County, North Carolina
Graphic Scale
4. Soundings are expressed in feet and tenths.
'1)1
Z � 12'
o. 100, 200' 400+
5. Single Beam bathymetry collected at 200 kHz on survey lines spaced 120' apart.
N EARS H O RE INVESTIGATIONAL SURVEY
iiii
1" = 200'
- c
d Z 16
Contours are generated from a DTM model of the soundings at 1ft interval.
6. Side scan sonar images generated from data collected at 1600kHz (High Frequency).
TI Coastal Services, Inc.
Ill "1Scale:
ow 20'
7. Station lines from yearly monitoring surve s.
DWG NAME: 2021_Oaklsland Hardbottom Inves w Samples.dwg
387-B N. Green Meadows Drive
LL
24
Wilmington, NC 28405
0>30'28'
Sidescan Imagery, Color Contours, & Bathymetry
DWG DATE: July 15, 2021
SURVEY DATE: June 16-18, 2021
SCALE: 1" = 200'
SHEET: 2 OF 6
910.821.1358

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13 135 13.4 13:8 14 "a I 14.4 14J 14:6 146 116.
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12,1 12jj-13.5 13.6 141 14 ±d3 14:6 14:8 15 14J 16 15,9 158 15.6 15.9 '62 taa 16:5 +6•Y
d 2'' 12.8 �, 14.1 14 tga- 14.5 14.5 14:9 14.8 14. 15J 16 i6:6 t6.1 t6-1 b.b i6.4 lb.4 17A 16.7 16.6 171
12.6 12:6 13 I 13:1 13y i3.6 13.8 1 14.5 142 15 15. 15J 15.9 •'.1 16.1 l6� 16.5 16.7 169 16.6 17? 17 17 17.5 16,0 ,�a I "e 111 17,1 117
nt 13 13. 13.6 13a 13.7 tea 14 14.t ".:", 14.6 14J 14.7 5 :5 1Fa ua 1Z.1 L__ 17.1
13J 13.8 13:9 tq t 14 ±q a 14.7 14:9 15.8 16.1 ieJ 16.8 16.7 17 17.6 i' 1/'� 17.8 17.7 17.6 17.7 1R.a 18 16.1 17.9 o T 18 tsia
4.2 452
''4S 14:7 14.7 14,6 14.7 14.6 14.7 16 16.1 15:8 16-a •'y 16.8 16. 16:8 17.? 17 l75 '7' 1L6 17.8 .,.. 18 18 +^ 103 18:1 +aa 18J ln.4 iq;l
14:9 14:8 15 15:8 15.9 ib.6 ib.t 6 - 18.9 16,6 18,5 b 18.9 19 18,7
16.9 17.1 4 17.E 17.8 17.7 I8-? 17.9 18.a MD 18.5 18.6 18.8 18.8 18.9 1^ 3 9 a 19.4
7 15.9 15.7 16.1 15.8 15,8 15.8 1� a it- ib.b ib a '17 171 18.1 _ 18.9 19J
16:6 17 +7.417,9 18.6 °- 2 io.4 its.c 18.9 18.4 18.7 19.1 l9 a 19 2 i7.5 19:7 19.6 a
16 16 a 1c 2 a 17 17.4 I8.1 ^,^ ioa 18.8 19 19.7 in4 i20 20. 20 199 19.9
MD 1 16.8 j� i7.1 17 4 17.5 177 17.8 17.7 tR.t l°9 19.1 ^_ 18.8 5.4 '9.2 ^,.3 19.8 19.9 19.8 20 0 20. 20.9 20.7 20.7 20.7
18.9 18.8 19.1 19.5 20.6
17.1 17v t73 17.7 18.1 taz 1^3 i8,y iaa 19 19.7 17.9 20 19.6 20J 20.6 20:6 20.9 20.9 o±, a+? „� 20.9
16b 16.6 11� 5 17.8 17.6 18.2 17.8 17.8 0 ^ 18.5 fas 19 19.1 191 19,6 i9.� 19.7 20 19:9 4 20.7 20J ?t t 20.9 21 ?t + 21 21 21.1 di.b 2i.3 2i•7 21.5 tl'4
17.9 18 18 ^ ' a 18.7 ia•� 18.8 19.a a 19 19.7 19.9 2 20.7 2 . 21 20.7 21 a± a 21.7 21J 2 2 21.6
19.6 20.7 2t • • ^. ^ a17 21.7 2i•� 21.5 21.6 21.4 21.6 22 21.7 21.9 21.7
1a.4 la.b 18J •19 +o '9.ti 18.9 19.6 19.E 20.8 a, ^ at 1 21.5 21.6 as 21.8 21.9 as 3 - 2 22 22 22.4 p2a 22.t 22 c2,� 22 aa.t
19T 19.b i7.5 19.6 19.9 20.7 20.8 21 2 22.1 21.7 21.6 22.a 21.6 21.8 222 :e.3 ee.a 22.7 22.4 22.5 22.8 22.5 22.6 22.3 22.4 22.5
19 19.1 19.6 1J.b Zp 19.9 20 20.6 20.7 a0'� 20.7 21:2 21.9 ^al a2 n^^ 22.6 228 23 22.7 22J 22.7
19,4 19.8 a20 MA 21.3 21.8 _ e2.6 21.9 22.5 22.6 22.5 22.8 22.9 22.7 22.6 23 _ 22,8 ?3 22.9
20.7 20. 20.8 20.9 21 a±? 2±a 21J 21.9 21.9_.- ee'7 22.9 22.6 2c.e 22.8 22.5 22.6 22.8 227 22.8 22.9 23.1 23
20J 20.6 21 20.9 b1a a_l 6 21.7 21.7 21.7 ;;'� 21J 22.a 22 22922.6 22.9 a.1 22.8 LL0 22.9 22.8 2''' 23.1 ;2�9 °3.2 e3.i
2pa 2t,2 au o, o at a 21:6 c1.4 21:9 21.7 22 ^c.4 ^^ ^ e2.i 22.7 �22.8 22.8 22J 22 229 2238 22J 22.E 22.6 22.0 2s i 23.1 23.e e3.1 22.8 . s.i 23 r3 23S 23 23.1 23.4 23.4
21.4 21.5 21.8 21.7 aa,5 aa.t 1,3 22.6 22.7 22.6 23.3 - 23 23 23.4 23.2 23.5 23.3
22.8 22'4 22.5 22.7 22.6 23.1 2� _ �v 9 23.3 23 23.2 23.5 23.3 23.5 23.2 23.4 23.4 23.4
21.7 21.9 22.1 22.5 229 22.8 22.9 23 2s.1 22.8 23 22.9 22.9 23.6 9 23.2 23.3 +
tea 22.6 22.6 22.9 22.8 22.8 22.8 22.4 2" ^^ 3 a 23.i
22.4 22.8 22.7 22.8 22.6 22.9 22.9 .1 23.3 2_.9 =3.1 22.9 23.2 23.3 23.5 23.3 23.5 23.6 23.4 2.9 23.4 23.4 23.3 23.4 23.7
22.4 22.6 22.6 23.1 23.t 2a a a? 22J 22.8 23 23 22.8 23 c3 22.6 2's.l 23.1 e� 23.2 23.3 23.5 23,3 23 23.3 if-3-3 23.1 23.2 23.6 23.3 23.5 23.5 23.7 23.6 23.4 23.9 23.5 23.6 23.4 23.5 23.5 23.7
22.8 23 222 CC.7 a '3 22.9 23 2 23.4 ^2.9 23 23.3 22.7 2�•1 23.3 23.3 23.2 23.3 23.4 23.5 23.2 23.4 23.4 23.6 23.7 23.5 23.6 23.5 23.5 23.5 23.4 23.5 23.9 23.6 23.9 23.6 23.7 23.8 23.9
23.2 3 - 2c i 23 23.3 23 -- - 23.3 23.8 23.5 23.5 23.8 23.4 23.5 23.3 23.5 23.3 23.4 23.7 23.9 23.8 23.5 23.6 23.9 23.5 23.6 23.9 23.7 23.9 23.9 23.9 23.7 24
23 %3.e 23.3 23.1 23.1 ^� t .3.1 23.2 23.1 23.2 23.2 23' 23.4 23.7 23.8 23:9
23.3 23.4 23.2 23.4 23,2 23.5 23.2 23.1 23.4 236 23.7 23.5 23.6 2a.2 23.5 23.8 23.2 23.6 23.3 23.6 23.6 24.1 23.8 23.7 23.8 23.8 23.7 23.6 2^ 23.8 24 23.8 2, 23.8 23.9
23.4 23.7 23.4 23.3 23.2 23.3 23.5 23.4 23.5 23.5 23.e 3.6 24.1 23.5 23.9 23.9 23.9 23.5 23.9 23.7 23.7 24 23J 2a.1 as 2.7 23.6 _4,i 2�8 24 24 _y = aq±
23.7 23.4 23.4 23.5 23.4 23.5 23.4 23.5 23.6 23.4 23.6 23.2 2 a� q o i as ae 23.9 23.8 23.9 pey 24 24.2 23.9 24.2 �4 1 e4
23.6 23.7 23.7 23.7 23.5 23.6 23.4 23.5 23.5 23.7 23.7 23.6 23.7 23.7 23.. as a.2 -3.6 Q4.1 G4.0 as - oa 24.2 cv 24.3
23.7 23.7 23.6 23.7 23.7 23.6 23.6 23.5 23.8 23.9 23.4 23.6 23.8 23.5 23 5 23J 23.> 23.9 2 24.1 23.8 ^".3 23J 23.9 24 24.3 24.2 24.1 24.1 24.3 24.4 24.2 24.3 24.3 24.2 24.3
23.8 23.7 23.5 23.7 23.7 23.9 24.2 a_3.8 23o a '4.2 24.3 239 24.3 23.8 23.9 ea 24-' 24.2 24.3 24.2 24.4 24.2 24.4 24.3 24.3 24.5
24 23.8 23.8 23.2 23.8 23.6 24 23.9 23.7 24:3 ^. 24.2 24.4
23.9 24.2 24 23.9 23.9 24 23.9 23.7 23.8 23.8 24 2-0: Le az a as 24:2 24.2 2> 24.2 24.3 e4.3 24.4 24.2 24.2 24.4 24.3 24.1 24.2 24.5 24.4 24.5 24.4 24.4 24.6
23.8 23.7 23.9 23.9 24 24 -i 1 _-' 24.2 24.1 ^' 24.3 24.4 24.1 24.4 23.9 24.5 24.1 24.1 24.3 24.5 24.3 24.4 24.4 24.2 24.3 24.6 24.4 24.6 24.5 24.4 24.4 24.6
2j.q 4.1 241 �^ ^ _ • • 23.9 24 24.3 24.2 - 24.3 24.5 24.6 24.4 24.6 24.2 24.4 24.3 24.3 24.4 24.3 24.6 24.4 24.5 24.5 24.4 24.4 24.5 24.3 24.9 24.5 24.7 24.5 24.7
c4.1 --.1 24.3 2'= 24 23.8 2'.i eti.i 23.9 23.9 =3.9 ^a.t 24.7
23:9 24.2 24.1 . ; , ?a c4 -' 23.8 24 24.3 23.9 aa.t 24.4 't; 24.4 24.1 24.2 24.3 24.5 24.4 24.6 24.3 24.6 24.1 24.3 24.4 24.4 24.6 24.5 24.6 24.7 24.4 24.5 24.7 24.6 24.7 24.6 24.8 24.7 .6 24J
24:1 24.2 24.1 24.1 24 t ".2 24.3 25 24.1 24.4 2� a 24.5 24.3 24.5 24.4 24.5 24.5 24.6 24.3 24.8 24.4 24.4 24.4 24.6 24.6 24.5 24.7 24.7 24.5 24.6 24.8 24.7 24.8 24.8 24.6 24.8
2.: t 24.3 24.2 24.3 24.2 24.3 24.4 24.2 24.3 24.3 24.4 24 24.1 24.3 24.4 24.6 24.5 24.4 24.5 24.4 24J 24.3 24.7 24.6 24.5 24.7 24J 24.6 24.8 24.8 24.5 24.7 24.9 24.9 25 24.5 24.9 24.9
24.2 24.4 24.6 24.4 24.3 24:4 24.2 24.2 24.3 24.3 24.4 24.2 24.3 2.6 24.3 24.4 24.7 24.8 24.8 25 24.9 24.9 25
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Additional Notes:
1. Area denoted with dashed line indicates areas where further methods of investigation
(i.e. Ponar grab samples, divers) has been recommended based on side scan returns.
2. Ponar grab samples performed July 13, 2021. Sample locations indicated by blue
a00 + N 0 + - circles and labeled as N5EQ
3. All ponar grab samples returned evidence of silty and or sandy material. No physical
evidence of hard bottom was discovered.
OO O O O O O O O �0o�mo00WI I f WI l f
COLOR CONTOUR
LEGEND
<0OAK
ISLAND HARDBOTTOM SURVEY
'N"`c'•
1. Horizontal Datum: NC State Plane - Zone 3200, NAD83, Feet
2. Vertical Datum: NAVD88
co 4'
3. Data collected by TI Coastal between June 16 & 18, 2021 and represent conditions at
>>
Town of Oak Island
that time.
TI'�1 oastal
W Z 8
Brunswick County, North Carolina
Graphic Scale
4. Soundings are expressed in feet and tenths.
'1)1
Z 1- 12'
o. 100, 200' 400'
S. Single Beam bathymetry collected at 200 kHz on survey lines spaced 120' apart.
N EARS H O RE INVESTIGATIONAL SURVEY
iiii
Scale: 1" = 200'
- c
CL Z 16
Contours are generated from a DTM model of the soundings at 1ft interval.
6. Side scan sonar images generated from data collected at 1600kHz (High Frequency).
TI Coastal Services, Inc.
W W
ow 20'
7. Station lines from yearly monitoring surve s.
DWG NAME: 2021_Oaklsland Hardbottom Inves w Samples.dwg
387-B N. Green Meadows Drive
LL
24
Wilmington, NC 28405
0>30'28'
Sidescan Imagery, Color Contours, & Bathymetry
DWG DATE: July 15, 2021
SURVEY DATE: June 16-18, 2021
SCALE: 1" = 200'
SHEET: 3 OF 6
910.821.1358

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Additional Notes:
1. Area denoted with dashed line indicates areas where further methods of investigation
(i.e. Ponar grab samples, divers) has been recommended based on side scan returns.
2. Ponar grab samples performed July 13, 2021. Sample locations indicated by blue
N 0 circles and labeled as N5a
+ + 3. All ponar grab samples returneturn ed evidence of silty and or sandy material. No physical
evidence of hard bottom was discovered.
COLOR CONTOUR
LEGEND
<0OAK
ISLAND HARDBOTTOM SURVEY
'N"`c'•
1. Horizontal Datum: NC State Plane - Zone 3200, NAD83, Feet
2. Vertical Datum: NAVD88
co 4'
3. Data collected by TI Coastal between June 16 & 18, 2021 and represent conditions at
>>
Town of Oak Island
that time.
T I'�1 oastal
W Z 8
Brunswick County, North Carolina
Graphic Scale
4. Soundings are expressed in feet and tenths.
'1)1
Z � 12'
oe 100, 200' 400'
S. Single Beam bathymetry collected at 200 kHz on survey lines spaced 120' apart.
N EARS H O RE INVESTIGATIONAL SURVEY
iiii
Scale: 1" = 200'
- c
3: Ill
d Z 16
Contours are generated from a DTM model of the soundings at 1ft interval.
6. Side scan sonar images generated from data collected at 1600kHz (High Frequency).
TI Coastal Services, Inc.
Ill1N 20'
ow
7. Station lines from yearly monitoring surveys.
DWG NAME: 2021_Oaklsland Hardbottom Inves w Samples.dwg
387-B N. Green Meadows Drive
LL
24
Wilmington, NC 28405
0>30'28'
Sidescan Imagery, Color Contours, & Bathymetry
DWG DATE: July 15, 2021
SURVEY DATE: June 16-18, 2021
SCALE: 1" = 200'
SHEET: 4 OF 6
910.821.1358

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Additional Notes:
1. Area denoted with dashed line indicates areas where further methods of investigation
(i.e. Ponar grab samples, divers) has been recommended based on side scan returns.
2. Ponar grab samples performed July 13, 2021. Sample locations indicated by blue
circles and labeled as GS-##.
3. All ponar grab samples returned evidence of silty and or sandy material. No physical
evidence of hard bottom was discovered.
cV
N
tV
N
W
N
N
W
= fV
N
(V
N
W
N
W
N
W
N
W
COLOR CONTOUR
LEGEND
<0OAK
ISLAND HARDBOTTOM SURVEY
Notes:
1. Horizontal Datum: NC State Plane - Zone 3200, NAD83, Feet
2. Vertical Datum: NAVD88
� 4'
3. Data collected by TI Coastal between June 16 & 18, 2021 and represent conditions at
>>
Town of Oak Island
that time.
TI'�1 O a s a
W Z 8
Brunswick County, North Carolina
Graphic Scale
4. Soundings are expressed in feet and tenths.
'1)1
Z � 12'
0. 100, 200' 400�
5. Single Beam bathymetry collected at 200 kHz on survey lines spaced 120' apart.
N EARS H O RE INVESTIGATIONAL SURVEY
1" = 200'
- c
d Z 16
Contours are generated from a DTM model of the soundings at 1ft interval.
6. Side scan sonar images generated from data collected at 1600kHz (High Frequency).
TI Coastal Services, Inc.
III "1Scale:
o W 20'
7. Station lines from yearly monitoring surve s.
DWG NAME: 2021_Oaklsland Hardbottom Inves w Samples.dwg
387-B N. Green Meadows Drive
1;
24
Wilmington, NC 28405
0>30'
Sidescan Imagery, Color Contours, & Bathymetry
DWG DATE: July 15, 2021
SURVEY DATE: June 16-18, 2021
SCALE: 1" = 200'
SHEET: 5 OF 6
910.821.1358

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IN
Additional Notes:
1. Area denoted with dashed line indicates areas where further methods of investigation
(i.e. Ponar grab samples, divers) has been recommended based on side scan returns.
2. Ponar grab samples performed July 13, 2021. Sample locations indicated by blue
circles and labeled as GS-##.
3. All ponar grab samples returned evidence of silty and or sandy material. No physical
. ..._. .._- o
O
0
ui
N
N
o
O
0
M
N
W
O
O O
W n
a
.' In
N N
N
O
W
In
N
N
evidence of hard bottom was discovered.
o
O O
oI
n
In
N
N
W
COLOR CONTOUR
LEGEND
<0OAK
ISLAND HARDBOTTOM SURVEY
Notes:
1. Horizontal Datum: NC State Plane - Zone 3200, NAD83, Feet
2. Vertical Datum: NAVD88
�
4'
3. Data collected by TI Coastal between June 16 & 18, 2021 and represent conditions at
>>
Town of Oak Island
that time.
TI'�1 O a s a
W Z
8
Brunswick County, North Carolina
Graphic Scale
4. Soundings are expressed in feet and tenths.
'1)1
Z 1-
12i
o. 100, 200' 400�
5. Single Beam bathymetry collected at 200 kHz on survey lines spaced 120' apart.
N EARS H O RE INVESTIGATIONAL SURVEY
iiii
1" = 200'
- c
d Z 16i
Contours are generated from a DTM model of the soundings at 1ft interval.
6. Side scan sonar images generated from data collected at 1600kHz (High Frequency).
TI Coastal Services, Inc.
Ill "1Scale:
ow
20'
7. Station lines from yearly monitoring surve s.
DWG NAME: 2021_Oaklsland Hardbottom Inves w Samples.dwg
387-B N. Green Meadows Drive
LL
24
DWG DATE: July 15, 2021
SURVEY DATE: June 16-18, 2021
Wilmington, NC 28405
0>30'28'
Sidescan Imagery, Color Contours, & Bathymetry
SCALE: 1" = 200'
SHEET: 6 OF 6
910.821.1358