Buxton P14 BorrowArea_GeotechRev30July2021

1 :11
.!1
Scale (Feet)
o Bux-35
Mean
STD
Gravel
Granules
Dry Fines
Shell
Ra (all)
Ra (vis)
Mill
N
BUX-36
BUX-35
10 ft COMP
0.478
0.486
0.0
3.7
1.5
11.8
1.00
1.11
Bux-06 00.,
BUX-36
10 ft COMP
0.268
0.417
0.0
4.9
2.5
11.1
1.34
1.82
BUX-35
0.478
11.
11.8
BUX-42
0.596
12.6
11.1
4.9
BUX-43
9 0.552
22.1
7.7
� UX-37
0.512
BUX-37
BUX-38
BUX-39
BUX-40
BUX-41
10 ft COMP
10 ft COMP
10 ft COMP
10 ft COMP
10 ft COMP
0.512
0.282
2.3
15.3
1.6
22.5
1.16
1.33
0-574
0.530
0.0
3.6
0-9
11.4
1.00
1.02
0.579
0.531
0.0
3.8
0-9
15.5
1.00
1.02
0.681
0.421
0.0
12.6
0.0
16.5
1.01
1.07
0.536
0.539
0.0
3.8
0.0
15.0
1.00
1.02
0.596
0.490
0.0
10.1
0.0
12.6
1.00
1.04
BUX-41 22.5
BUX-42 10 ft COMP
Bux-04
0.536
15.0
3.8
BUX-44
0.557
17.9
17.5
BUX-43
BUX-44
10 ft COMP
10 ft COMP
0.552
0.467
0.9
6.8
0.5
22.1
1.00
1.08
0.557
0.386
2.3
8.5
0-0
17.9
1.04
1.17
ALL
10 ft COMP
0.517
0.426
0.6
7.1
0.6
15.6
1.02
1.15
10.9
BUX-40
0.681
16.5
12.6
BUX-39 u Bux-05
0.579
15.5
3.8
, Buxom - _
/ Bux-33 / i ox-38
d /
o Bux-31 / /
Previous Borrow Area (2018)
Bu/34
o Bux-32 /
o Bux-29 /
Notes:
Beach sediment samples (n=140) obtained in August 2019 and analyzed by Coastal
Science & Engineering, Inc.
Offshore borings obtained in April 2021 (10-ft long, 3 inch tubes). Grain size distributions
` based on dry sieving at 0.25 phi intervals.
* Ra - Overfill factor. It provides a measure of how a particular sediment will perform as beach nourishment. Low
Ra's are generally preferred, with ideal being eaqual to 1.0. See Appendix A for detailed geotechnical data.
0.574
11.4
3.6
Boring
MGS (mm)
Shell %
Gravel %
Granule %
BUX-35
0.478
11.8
0.0
3.7
BUX-36
0.268
11.1
0.0
4.9
BUX-37
0.512
22.5
2.3
15.3
BUX-38
0.574
11.4
0.0
3.6
BUX-39
0.579
15.5
0.0
3.8
BUX-40
0.681
16.5
0.0
12.6
BUX-41
0.536
15.0
0.0
3.8
BUX-42
0.596
12.6
0.0
10.1
BUX-43
0.552
22.1
0.9
6.8
BUX-44
1 0.557
17.9
2.3
8,5
Locations, mean grain size, percent shell, and percent gravel for
core composite samples to 10 ft in the proposed Buxton borrow
area based on borings obtained in April 2021.
Applicant:
Dare County
954 Marshall Collins Dr.
Manteo, NC 27954
Grain Size Distribution
Grain Size (mm)
4 2 1 0.5 0.25 0.125 0.1
10016 8
-+� Borrow Area 10 ft COMP
go
Beach
80
-
70
.. ... .. .. ...... .
60.....
o
50
40
30
.. .... .....
... ...:..
20
.............
10
0 T - _ .-tip
-4 -3 -2 -1 0 1 2 3 4
Grain Size (0)
Project:
Beach Renourishment To Protect
NC Highway 12 At Buxton
Dare County, NC
DRAWING TITLE:
BORROW AREA CORES &
SEDIMENT ANALYSIS
Project CSE 2403-M
Location Buxton (NC)
Date May 2021
BA 10 ft COMP Mean 0.517 mm
BA 10 ft COMP STD 0.426 mm
BA 10 ft COMP Skew-0.489 mm
BA 10 ft COMP Kurt 4.107 mm
BA 10 ft COMP Shell 12.3%
All Beach Mean 0.321 mm
All Beach STD 0.552 mm
All Beach Skew -1.045 mm
All Beach Kurt 5.621 mm
All Beach Shell 7.2%
`�panuuuuuu�.
SCALE:
AS SHOWN
DATE:
30July 2021
DRAWN BY:
JJH
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APPROVED BY:
HLK
PROJECT#:
2403M