25B5002 - Appendix G- Site Characterization Report - AOC Part 2.pdf
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- W9123625B5002
About this file
This file contains cross-sectional diagrams and data plots showing subsurface geological conditions in the Atlantic Ocean Channel offshore of Southeast Virginia. The diagrams and plots, labeled as Figures 4-8 through 5-6g, detail sediment characteristics including grain size distributions, fines content, and median grain size (D50) profiles for different areas (A1-A7) along the navigation channel. The data is presented through subsurface cross sections showing potential borrow units (PBU and PBU-A), elevation profiles relative to mean lower low water (MLLW), CPT soundings, and laboratory test results. The figures indicate varying sediment compositions with fines content ranging from approximately 2-98% and median grain sizes (D50) generally between 0.1-0.5 mm across the different areas. This geological data appears to support site characterization for dredging activities in the Atlantic Ocean Channel.
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Text version
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N30E
23' S30W
0 50 100
0 50 100
0 50 100 qt, tsf
Fr, %
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100
NCEER
D50=0.26
D50=0.149
D50=0.24
D50=0.28
D50=0.42
D50=0.09
10 ft
200 ft
Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU
PBU-A PBU
NAVIGATION CHANNEL
3%
2%
12%
6%
5%
15%
Virginia Port Authority Project No. 3582.006
FIGURE 4-8
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
SUBSURFACE CROSS SECTION 23-23'
Atlantic Ocean Channel
Offshore Southeast Virginia
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
PBU
LEGEND
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N30E
24' S30W
0 50 100
0 50 100 0 50 100
0 50 100
0 50 100 qt, tsf
Fr, %
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100
NCEER
0 50 100
/BYM
D50=0.14
D50=0.35
D50=0.39
D50=0.135
D50=0.36
D50=0.365
D50=0.144
D50=0.42
D50=0.34
D50=0.33
D50=0.36
10 ft
200 ft Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU
PBU-A
PBU
NAVIGATION CHANNEL
2% 4%
3%
13%
12%6%
13%
2% 3%
2% 6%
Virginia Port Authority Project No. 3582.006
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line. FIGURE 4-9
SUBSURFACE CROSS SECTION 24-24'
Atlantic Ocean Channel
Offshore Southeast Virginia
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N30E
25' S30W
0 50 100
0 50 100
0 50 100 qt, tsf
Fr, %
0 50 100 Fines (%)
0 50 100
NCEER
0 50 100
/BYM
D50=0.11
D50=0.46
D50=0.167
D50=0.29
0 50 100
10 ft
200 ft Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU
PBU-A
PBU
NAVIGATION CHANNEL
9%
18%
4%
17%
Virginia Port Authority Project No. 3582.006
FIGURE 4-10
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
SUBSURFACE CROSS SECTION 25-25'
Atlantic Ocean Channel
Offshore Southeast Virginia
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N30E
26' S30W
0 50 100
0 50 100
0 50 100
0 50 100
0 50 100 qt, tsf 0 50 100 qt, tsf
Fr, % 0510
Fr, %
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100
NCEER 0 50 100
NCEER
D50=0.135
D50=0.295
D50=0.14
D50=0.15
D50=0.27
D50=0.21
D50=0.17
D50=0.31
D50=0.52
D50=0.17
D50=0.41
10 ft
200 ft Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU
PBU-A
PBU
NAVIGATION CHANNEL
9%
12%
4%
8%
22%
5%
12%
16%
2%
10%
5%
Virginia Port Authority Project No. 3582.006
FIGURE 4-11
SUBSURFACE CROSS SECTION 26-26'
Atlantic Ocean Channel
Offshore Southeast Virginia
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N30E
27' S30W
0 50 100
0 50 100
0 50 100
0 50 100 qt, tsf
0 50 100 qt, tsf
Fr, %
Fr, %
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100
NCEER
0 50 100
NCEER
D50=0.242
D50=0.16
D50=0.265
D50=0.21
D50=0.16
D50=0.3
D50=0.34
D50=0.24
D50=0.14
D50=0.33
10 ft
200 ft Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU
PBU-A
PBU
NAVIGATION CHANNEL
6%
15%
17%
3%
9%
14%
4%
12%
6%
Virginia Port Authority Project No. 3582.006
FIGURE 4-12
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
SUBSURFACE CROSS SECTION 27-27'
Atlantic Ocean Channel
Offshore Southeast Virginia
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N30E
28' S30W
0 50 100 0 50 100
0 50 100
0 50 100 qt, tsf
Fr, %
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100
NCEER
D50=0.13
D50=0.21
D50=0.41
D50=0.12
D50=0.135
D50=0.27
D50=0.11
D50=0.21
10 ft
200 ft
Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU PBU-A PBU
NAVIGATION CHANNEL
3% 5%
13%
18%
19%
22%
2%
20%
Virginia Port Authority Project No. 3582.006
FIGURE 4-13
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
SUBSURFACE CROSS SECTION 28-28'
Atlantic Ocean Channel
Offshore Southeast Virginia
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N30E
29' S30W
0 50 100
0 50 100
0 50 100 qt, tsf
0 50 100 qt, tsf
0 50 100 qt, tsf
Fr, %
Fr, %
Fr, %
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100
NCEER
0 50 100
NCEER
0 50 100
NCEER
0 50 100
/BYM
D50=0.12
D50=0.14
D50=0.295
D50=0.12
D50=0.99
D50=0.25
10 ft
200 ft
Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU PBU-A PBU
NAVIGATION CHANNEL
17%
18%
4% 12%
11%
22%
Virginia Port Authority Project No. 3582.006
FIGURE 4-14
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
SUBSURFACE CROSS SECTION 29-29'
Atlantic Ocean Channel
Offshore Southeast Virginia
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N31E
30' S31W
0 50 1000 50 1000 50 100 0 50 100
0 50 100
0 50 100
0 50 100 qt, tsf
Fr, %
0 50 100 Fines (%)
0 50 100 Fines (%) 0 50 100
Fines (%)
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100
NCEER
0 50 100
/BYM
D50=0.1
D50=0.099
D50=0.14
D50=0.11
D50=0.08
D50=0.145
D50=0.41
D50=0.21
D50=0.2
D50=0.14
D50=0.17
D50=0.135
D50=0.22
10 ft
200 ft
Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU PBU-A PBU
NAVIGATION CHANNEL
36%
33%
36%
53%
23%
24% 15%21%
45%
12%
19%
14%
9% 15%
Virginia Port Authority Project No. 3582.006
FIGURE 4-15
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
SUBSURFACE CROSS SECTION 30-30'
Atlantic Ocean Channel
Offshore Southeast Virginia
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N47E
31' S47W
0 50 100
0 50 100
0 50 100 0 50 100
0 50 100 qt, tsf
Fr, %
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100 Fines (%)0 50 100
Fines (%)
0 50 100
NCEER
0 50 100
/BYM
D50=0.123
D50=0.24
D50=0.083
D50=0.23
D50=0.14
D50=0.25
D50=0.29
D50=0.15
D50=0.27
D50=0.36
D50=0.34
D50=0.12
D50=0.26
D50=0.34
D50=0.42
0 50 100
10 ft
200 ft
Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU
PBU-A PBU
NAVIGATION CHANNEL
7%12%
6%
20% 16%
44%
14%
23% 21%
18%
15%
15%
14%
15%
6%
Virginia Port Authority Project No. 3582.006
FIGURE 4-16
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
SUBSURFACE CROSS SECTION 31-31'
Atlantic Ocean Channel
Offshore Southeast Virginia
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N46E
32' S46W
0 50 100 0 50 100
0 50 100 qt, tsf
0 50 100 qt, tsf0 50 100 qt, tsf
Fr, %
Fr, % 0510
Fr, %
0 50 100 Fines (%) 0 50 100
Fines (%)
0 50 100
NCEER
0 50 100
NCEER
0 50 100
NCEER
D50=0.13
D50=0.32
10 ft
200 ft Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU PBU-A PBU
NAVIGATION CHANNEL
25%
4%
52%
55%
Virginia Port Authority Project No. 3582.006
FIGURE 4-17
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
SUBSURFACE CROSS SECTION 32-32'
Atlantic Ocean Channel
Offshore Southeast Virginia
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N46E
33' S46W
0 50 100
0 50 100
0 50 100
0 50 100 qt, tsf
0 50 100 qt, tsf0510
Fr, %
Fr, %
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100
NCEER
0 50 100
NCEER
D50=0.17
D50=0.16
D50=0.27
D50=0.42D50=0.62
D50=0.27
10 ft
200 ft
Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU PBU-A PBU
NAVIGATION CHANNEL
16%
2%
20%
56%
29%
21%
98% 12%
97%
Virginia Port Authority Project No. 3582.006
FIGURE 4-18
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
SUBSURFACE CROSS SECTION 33-33'
Atlantic Ocean Channel
Offshore Southeast Virginia
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N46E
34' S46W
0 50 100 qt, tsf
0 50 100 qt, tsf
0 50 100 qt, tsf
Fr, %
Fr, %
Fr, %
0 50 100
NCEER
0 50 100
NCEER
0 50 100
NCEER
0 50 100
/BYM
0 50 100
/BYM
10 ft
200 ft
Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU
PBU-A
PBU
NAVIGATION CHANNEL
Virginia Port Authority Project No. 3582.006
FIGURE 4-19
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
SUBSURFACE CROSS SECTION 34-34'
Atlantic Ocean Channel
Offshore Southeast Virginia
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N46E
35' S46W
0 50 100
0 50 100
0 50 100 qt, tsf
0 50 100 qt, tsf
0 50 100 qt, tsf0510
Fr, %
Fr, %
Fr, %
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100
NCEER
0 50 100
NCEER
0 50 100
NCEER
0 50 100
/BYM
0 50 100
/BYM
D50=0.1
0 50 100
0 50 100
10 ft
200 ft
Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU PBU-A
PBU
NAVIGATION CHANNEL
38%
75%
56%
61% 80%
53%
Virginia Port Authority Project No. 3582.006
FIGURE 4-20
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
SUBSURFACE CROSS SECTION 35-35'
Atlantic Ocean Channel
Offshore Southeast Virginia
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N46E
36' S46W
0 50 100
0 50 100
0 50 100 0 50 100
0 50 100 qt, tsf
0 50 100 qt, tsf
Fr, %
Fr, %
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100 Fines (%)
0 50 100
NCEER
0 50 100
NCEER
0 50 100
/BYM
D50=0.53
D50=0.372
D50=0.49
D50=0.5
D50=0.36
D50=0.29
D50=0.53
D50=0.55
D50=0.38
D50=0.44
10 ft
200 ft
Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU PBU-A
PBU
PBU
Poor Quality Seismic Data in this Area Base of PBU from Geotechnical Data
NAVIGATION CHANNEL
4%
11%
3%
2%
8%
6%
4%
5%
4%
4%
Virginia Port Authority Project No. 3582.006
FIGURE 4-21
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
SUBSURFACE CROSS SECTION 36-36'
Atlantic Ocean Channel
Offshore Southeast Virginia
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N46E
37' S46W
0 50 100
0 50 100 qt, tsf
0 50 100 qt, tsf
0 50 100 qt, tsf0510
Fr, %
Fr, %
Fr, %0 50 100
NCEER
0 50 100
NCEER
0 50 100
NCEER
0 50 100
/BYM
D50=0.17
PBU
PBU-A
PBU
NAVIGATION CHANNEL
98%
75%
31%
Virgainia Port Authority Project No. 3582.006
SUBSURFACE CROSS SECTION 37-37'
Atlantic Ocean Channel
Offshore Southeast Virginia
FIGURE 4-22
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
N46E
38' S46W
0 50 100
0 50 100 qt, tsf
Fr, %
0 50 100
NCEER
D50=0.11
10 ft
200 ft
Horizontal and Vertical Scales in Feet Vertical exaggeration is 20x.
PBU
PBU-A
PBU
NAVIGATION CHANNEL
80%
76%
38%
Virginia Port Authority Project No. 3582.006
FIGURE 4-23
5. Soil classifications used for the mCPTs are based on the empirical classifications of Robertson and Campanella (1988) for full-size CPT data. We note that those classifications may err in their classification of transitional soils (such as silts) and in loose granular sediments near the seafloor.
6. Stratigraphic contacts are approximate and are interpreted from CPT soundings, vibracores, and seismic reflection survey data. Conditions vary both along and perpendicular to the section line.
Notes:
1. Elevation reference to mean lower low water (MLLW).
2. Refer to Figure 3-4 for key to symbolism used on cross sections.
3. Approximate location of dredge cut based on El. -63 ft, in accordance with NEPA documents.
4. Vibracore and CPT sounding logs are projected onto the line of the cross sections.
Therefore, stratigraphic contacts may not exactly correspond to the indications (lithology, shear strength, etc.) in the logs.
SUBSURFACE CROSS SECTION 38-38'
Atlantic Ocean Channel
Offshore Southeast Virginia
2007 USACE Bathymetry
Base of Potential Borrow Unit
Potential Borrow Unit- Available (Note 3)
Potential Borrow Unit Refer to text for description.
PBU-A
Grain Size (mm) 0.0010.0020.0050.010.020.050.10.20.5125102050100
3 1.5 3/4 3/8 4 10 20 40 100 200
US STD SIEVE SIZE
INCHES US STD SIEVE SIZE NUMBERS HYDROMETER ANALYSIS
GRAVEL SAND
SILT OR CLAY
Coarse Fine Coarse Medium Fine
GRAIN SIZE CURVES - Area A1 Atlantic Ocean Channel
Offshore Southeast Virginia
LEGEND
Mean
Potential Borrow Material
± 1 Standard Deviation
DRAFT
3 1.5 3/4 3/8 4 10 20 40 100 200
US STD SIEVE SIZE
INCHES US STD SIEVE SIZE NUMBERS HYDROMETER ANALYSIS
GRAVEL SAND
SILT OR CLAY
Coarse Fine Coarse Medium Fine
GRAIN SIZE CURVES - Area A2 Atlantic Ocean Channel
Offshore Southeast Virginia
LEGEND
Mean
Potential Borrow Material
3 1.5 3/4 3/8 4 10 20 40 100 200
US STD SIEVE SIZE
INCHES US STD SIEVE SIZE NUMBERS HYDROMETER ANALYSIS
GRAVEL SAND
SILT OR CLAY
Coarse Fine Coarse Medium Fine
GRAIN SIZE CURVES - Area A3 Atlantic Ocean Channel
Offshore Southeast Virginia
LEGEND
Mean
Potential Borrow Material
3 1.5 3/4 3/8 4 10 20 40 100 200
US STD SIEVE SIZE
INCHES US STD SIEVE SIZE NUMBERS HYDROMETER ANALYSIS
GRAVEL SAND
SILT OR CLAY
Coarse Fine Coarse Medium Fine
GRAIN SIZE CURVES - Area A4 Atlantic Ocean Channel
Offshore Southeast Virginia
LEGEND
Mean
Potential Borrow Material
3 1.5 3/4 3/8 4 10 20 40 100 200
US STD SIEVE SIZE
INCHES US STD SIEVE SIZE NUMBERS HYDROMETER ANALYSIS
GRAVEL SAND
SILT OR CLAY
Coarse Fine Coarse Medium Fine
] Silty Sand
Sand with Silt
GRAIN SIZE CURVES - Area A5 Atlantic Ocean Channel
Offshore Southeast Virginia
LEGEND
Mean
Potential Borrow Material
3 1.5 3/4 3/8 4 10 20 40 100 200
US STD SIEVE SIZE
INCHES US STD SIEVE SIZE NUMBERS HYDROMETER ANALYSIS
GRAVEL SAND
SILT OR CLAY
Coarse Fine Coarse Medium Fine
GRAIN SIZE CURVES - Area A6 Atlantic Ocean Channel
Offshore Southeast Virginia
LEGEND
Mean
Potential Borrow Material
3 1.5 3/4 3/8 4 10 20 40 100 200
US STD SIEVE SIZE
INCHES US STD SIEVE SIZE NUMBERS HYDROMETER ANALYSIS
GRAVEL SAND
SILT OR CLAY
Coarse Fine Coarse Medium Fine
GRAIN SIZE CURVES - Area A7 Atlantic Ocean Channel
Offshore Southeast Virginia
LEGEND
Mean
Potential Borrow Material
Grain Size Percentage 0 10 20 30 40 50 60 70 80 90 100
-80
-75
-70
-65
-60
-55
-50
-45
-40
LEGEND
Gravel Percent
Coarse Sand Percent
Medium Sand Percent
Fine Sand Percent
Fines Percent
Virginia Port Authority Project No. 3582.006
FIGURE 5-2a
GRAIN SIZE DISTRIBUTION
Area A1
Atlantic Ocean Channel Offshore Southeast Virginia
-80
-75
-70
-65
-60
-55
-50
-45
-40
LEGEND
Gravel Percent
Coarse Sand Percent
Medium Sand Percent
Fine Sand Percent
Fines Percent
Virginia Port Authority Project No. 3582.006
FIGURE 5-2b
GRAIN SIZE DISTRIBUTION
Area A2
Atlantic Ocean Channel
-80
-75
-70
-65
-60
-55
-50
-45
-40
LEGEND
Gravel Percent
Coarse Sand Percent
Medium Sand Percent
Fine Sand Percent
Fines Percent
Virginia Port Authority Project No. 3582.006
FIGURE 5-2c
GRAIN SIZE DISTRIBUTION
Area A3
Atlantic Ocean Channel
-80
-75
-70
-65
-60
-55
-50
-45
-40
LEGEND
Gravel Percent
Coarse Sand Percent
Medium Sand Percent
Fine Sand Percent
Fines Percent
Virginia Port Authority Project No. 3582.006
FIGURE 5-2d
GRAIN SIZE DISTRIBUTION
Area A4
Atlantic Ocean Channel
-80
-75
-70
-65
-60
-55
-50
-45
-40
LEGEND
Gravel Percent
Coarse Sand Percent
Medium Sand Percent
Fine Sand Percent
Fines Percent
Virginia Port Authority Project No. 3582.006
FIGURE 5-2e
GRAIN SIZE DISTRIBUTION
Area A5
Atlantic Ocean Channel
-80
-75
-70
-65
-60
-55
-50
-45
-40
LEGEND
Gravel Percent
Coarse Sand Percent
Medium Sand Percent
Fine Sand Percent
Fines Percent
Virginia Port Authority Project No. 3582.006
FIGURE 5-2f
GRAIN SIZE DISTRIBUTION
Area A6
Atlantic Ocean Channel
-80
-75
-70
-65
-60
-55
-50
-45
-40
LEGEND
Gravel Percent
Coarse Sand Percent
Medium Sand Percent
Fine Sand Percent
Fines Percent
Virginia Port Authority Project No. 3582.006
FIGURE 5-2g
GRAIN SIZE DISTRIBUTION
Area A7
Atlantic Ocean Channel
Fines Content (%) 0 20 40 60 80 100
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
FINES CONTENT PROFILE FROM LABORATORY TEST DATA
Area A1
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-3a
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
FINES CONTENT PROFILE FROM LABORATORY TEST DATA
Area A2
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-3b
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
FINES CONTENT PROFILE FROM LABORATORY TEST DATA
Area A3
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-3c
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
FINES CONTENT PROFILE FROM LABORATORY TEST DATA
Area A4
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-3d
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
FINES CONTENT PROFILE FROM LABORATORY TEST DATA
Area A5
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-3e
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
FINES CONTENT PROFILE FROM LABORATORY TEST DATA
Area A6
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-3f
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
FINES CONTENT PROFILE FROM LABORATORY TEST DATA
Area A7
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-3g
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No.3582.006
FINES CONTENT PROFILE FROM mCPT AND LABORATORY DATA Area A1
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-4a
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
Potential Borrow Material"
Fines Content From mCPT Data (Robertson and Wride, 1998)
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
Potential Borrow Material
Fines Content From Lab Data
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No.3582.006
FINES CONTENT PROFILE FROM mCPT AND LABORATORY DATA Area A2
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-4b
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
Potential Borrow Material"
Fines Content From mCPT Data (Robertson and Wride, 1998)
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
Potential Borrow Material
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No.3582.006
FINES CONTENT PROFILE FROM mCPT AND LABORATORY DATA Area A3
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-4c
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
Potential Borrow Material"
Fines Content From mCPT Data (Robertson and Wride, 1998)
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
Potential Borrow Material
-80
-75
-70
-65
-60
-55
-50
-45
-40
With Fine-grained
Layers
Virginia Port Authority Project No.3582.006
FINES CONTENT PROFILE FROM mCPT AND LABORATORY DATA Area A4
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-4d
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
Potential Borrow Material
Fines Content From mCPT Data (Robertson and Wride, 1998)
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No.3582.006
FINES CONTENT PROFILE FROM mCPT AND LABORATORY DATA Area A5
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-4e
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
Potential Borrow Material"
Fines Content From mCPT Data (Robertson and Wride, 1998)
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
Potential Borrow Material
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No.3582.006
FINES CONTENT PROFILE FROM mCPT AND LABORATORY DATA Area A6
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-4f
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
Potential Borrow Material"
Fines Content From mCPT Data (Robertson and Wride, 1998)
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
Potential Borrow Material
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No.3582.006
FINES CONTENT PROFILE FROM mCPT AND LABORATORY DATA Area A7
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-4g
LEGEND
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
Potential Borrow Material"
Fines Content From mCPT Data (Robertson and Wride, 1998)
Fine Grain/Interbedded Material Beneath Potential Borrow Unit Material
Potential Borrow Material
D50 (mm)
0.01 0.02 0.05 0.1 0.2 0.5 1
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
MEDIAN GRAIN SIZE (D50) PROFILE
Area A1
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-5a
LEGEND
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
MEDIAN GRAIN SIZE (D50) PROFILE
Area A2
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-5b
LEGEND
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
MEDIAN GRAIN SIZE (D50) PROFILE
Area A3
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-5c
LEGEND
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
MEDIAN GRAIN SIZE (D50) PROFILE
Area A4
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-5d
LEGEND
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
MEDIAN GRAIN SIZE (D50) PROFILE
Area A5
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-5e
LEGEND
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
MEDIAN GRAIN SIZE (D50) PROFILE
Area A6
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-5f
LEGEND
-80
-75
-70
-65
-60
-55
-50
-45
-40
Virginia Port Authority Project No. 3582.006
MEDIAN GRAIN SIZE (D50) PROFILE
Area A7
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-5g
LEGEND
D50 (mm)
0.01 0.02 0.05 0.1 0.2 0.5 1
Virginia Port Authority Project No. 3582.006
FINES CONTENT AND MEDIAN GRAIN SIZE (D50) COMPARISION PLOT
Area A1
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-6a
LEGEND
Potential Borrow Material"
D50 (mm)
0.01 0.02 0.05 0.1 0.2 0.5 1
Virginia Port Authority Project No. 3582.006
FINES CONTENT AND MEDIAN GRAIN SIZE (D50) COMPARISION PLOT
Area A2
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-6b
LEGEND
D50 (mm)
0.01 0.02 0.05 0.1 0.2 0.5 1
Virginia Port Authority Project No. 3582.006
FINES CONTENT AND MEDIAN GRAIN SIZE (D50) COMPARISION PLOT
Area A3
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-6c
LEGEND
D50 (mm)
0.01 0.02 0.05 0.1 0.2 0.5 1
Virginia Port Authority Project No. 3582.006
FINES CONTENT AND MEDIAN GRAIN SIZE (D50) COMPARISION PLOT
Area A4
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-6d
LEGEND
D50 (mm)
0.01 0.02 0.05 0.1 0.2 0.5 1
Virginia Port Authority Project No. 3582.006
FINES CONTENT AND MEDIAN GRAIN SIZE (D50) COMPARISION PLOT
Area A5
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-6e
LEGEND
D50 (mm)
0.01 0.02 0.05 0.1 0.2 0.5 1
Virginia Port Authority Project No. 3582.006
FINES CONTENT AND MEDIAN GRAIN SIZE (D50) COMPARISION PLOT
Area A6
Atlantic Ocean Channel Offshore Southeast Virginia
FIGURE 5-6f
LEGEND
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