Dwg Reference Documents_13317433_Repair_Waterfront-2024-12-31.pdf
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- Attached to
- Repair Waterfront, U. S. Coast Guard Academy, New London, CT (New London County) Project No. 13317433
- Solicitation number
- 70Z0G125BCGA00165
About this file
The document is a sidescan sonar survey report documenting underwater debris and pilings in the Thames River, Connecticut, conducted by SeaVision Underwater Solutions, Inc. on December 9, 2018 for Appledore Marine, Inc. The survey identified 11 distinct underwater targets, including multiple pilings, humps, beams, and a debris field, with detailed measurements for each target including height, width, length, and shadow characteristics. The survey used a Klein 3500 Sidescan Sonar at 900 kHz and an Ixblue C3 Compact PHINS inertial navigation system, with data processed using Chesapeake Technologies SonarWiz 7 software. The survey was georeferenced using the North American Datum of 1983 and utilized NOAA tide station data for vertical measurements.
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Text version
Piling on Angle
Three Pilings Above Mudline
Three Pilings Above Mudline
One (Possibly Two) Pilings Above Mudline
Recommend Investigate This Lump After Discussing with Dredging Contractor
Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community
1179400 1179500 1179600 1179700 1179800 1179900 1180000 µ Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community
Vicinity Map (N.T.S.)
USCGA Small Boat Basin Dredging Debris Survey - Bathymetry Thames River, CT Client: Appledore Marine, Inc.
New London, CT Figure GC-01 Multibeam Bathymetric Survey Bathymetric Survey High Resolution Color Shaded Relief
0 40 8020 Feet
Scale
1 inch = 20 feet Check Graphic Scale
Notes
Figure 18-032-GC-01 Drawn By: Jeff Snyder, C.H.
Date: December 5, 2018 µ
1. The bathymetry depicted on this drawing represents the results of a survey performed by SeaVision Underwater Solutions, Inc. on November 24, 2018 and can only be considered to indicate the general conditions existing at that time.
2. The multibeam bathymetry depicted on this drawing has been collected with a Norbit 400 kHz CHIRP multibeam echosounder, paired with an SBG Systems Ekinox-D Inertial Navigation System The system received Real-Time Kinematic Corrections from the KeyNetGPS Virtual Reference Station (VRS) Network.
3. All data has been collected and processed using the Hypack 2018 hydrographic survey software package. The data has been collected and sorted into a grid consisting of 6-in by 6-in grid cells, where each sounding represents the average of all soundings collected in each cell. The color-shaded relief map has been generated from a triangulated irregular network (TIN) terrain model derived from the grid.
4. Horizontal positioning references the North American Datum of 1983 (NAD 1983) Connecticut State Plane (feet).
5. Vertical elevations reference soundings below the plane of NOAA Mean Lower Low Water (MLLW) based on NOAA Tide Station 8461490 (New London). MLLW is assumed to be -1.83-feet relative to the North American Vertical Datum of
1988 (NAVD 1988).
6. Background electronic navigation chart (ENC) imagery has been taken from NOAA Chart US5CN43M. Background aerial imagery is taken the World Imagery supplied by ESRI.
7. Background line drawings that indicate the piling foundation plan for the original pier footprint were provided by others.
Color Ramp Soundings
Below MLLW
Phone 508-250-0650 Fax 401-633-7113 http://www.seavisionmarine.com
151 Martine Street, Suite 103 Fall River, MA 02723
006 005
Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community
1179600 1179700 1179800 1179900 µ Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community
Vicinity Map (N.T.S.)
USCGA Small Boat Basin Dredging Debris Survey - Bathymetry Thames River, CT Client: Appledore Marine, Inc.
New London, CT Figure GC-02 Sidescan Sonar Survey Sidescan Sonar Overlaid on Bathymetry
0 20 4010 Feet
Scale
1 inch = 10 feet Check Graphic Scale
Notes
Figure 18-032-GC-02 Drawn By: Jeff Snyder, C.H.
Date: December 9, 2018 µ
1. The imagery depicted on this drawing represents the results of a survey performed by SeaVision Underwater Solutions, Inc. on December 9, 2018 and can only be considered to indicate the general conditions existing at that time.
2. The sidescan sonar imagerydepicted on this drawing has been collected with a Klein 3500 Sidescan Sonar at 900 kHz, paired with an Ixblue C3 Compact PHINS inertial navigation system.
3. All data has been collected and processed using the Chesapeake Technologies SonarWiz 7 software package.
4. Horizontal positioning references the North American Datum of 1983 (NAD 1983) Connecticut State Plane (feet).
5. Vertical elevations reference soundings below the plane of NOAA Mean Lower Low Water (MLLW) based on NOAA Tide Station 8461490 (New London). MLLW is assumed to be -1.83-feet relative to the North American Vertical Datum of
1988 (NAVD 1988).
6. Background electronic navigation chart (ENC) imagery has been taken from NOAA Chart US5CN43M. Background aerial imagery is taken the World Imagery supplied by ESRI.
7. Background line drawings that indicate the piling foundation plan for the original pier footprint were provided by others.
Color Ramp Soundings
Below MLLW
Phone 508-250-0650 Fax 401-633-7113 http://www.seavisionmarine.com
151 Martine Street, Suite 103 Fall River, MA 02723
Target Info User Entered Info
Generated on 12/9/2018 10:31:19 PM
Target Image
Report Sidescan Sonar Targets
41° 22.31929'' N 072° 05.69141'' W (WGS84)
● Click Position
● Map Projection: CT83F
(X) 1179816.87 (Y) 696946.65 (Projected Coordinates)
Dimensions and attributes
● Target Height: 3.73 US ft
● Target Width: 10.63 US ft
● Target Length: 18.74 US ft
● Target Shadow: 21.35 US ft
● Classification1: Hump
● Description:
41° 22.32170'' N 072° 05.69328'' W (WGS84)
● Click Position
● Map Projection: CT83F
(X) 1179808.19 (Y) 696961.25 (Projected Coordinates)
Dimensions and attributes
● Target Height: 0.80 US ft
● Target Width: 0.85 US ft
● Target Length: 7.30 US ft
● Target Shadow: 2.35 US ft
● Classification1: Beam
● Description:
41° 22.31161'' N 072° 05.70870'' W (WGS84)
● Click Position
● Map Projection: CT83F
(X) 1179738.13 (Y) 696899.45 (Projected Coordinates)
Dimensions and attributes
● Target Height: 2.13 US ft
● Target Width: 1.86 US ft
● Target Length: 2.61 US ft
● Target Shadow: 11.56 US ft
● Classification1: Piling
● Description:
41° 22.31104'' N 072° 05.70812'' W (WGS84)
● Click Position
● Map Projection: CT83F
(X) 1179740.80 (Y) 696895.98 (Projected Coordinates)
Dimensions and attributes
● Target Height: 1.67 US ft
● Target Width: 1.77 US ft
● Target Length: 1.30 US ft
● Target Shadow: 9.32 US ft
● Classification1: Piling
● Description:
41° 22.30963'' N 072° 05.70730'' W (WGS84)
● Click Position
● Map Projection: CT83F
(X) 1179744.60 (Y) 696887.49 (Projected Coordinates)
Dimensions and attributes
● Target Height: 1.35 US ft
● Target Width: 2.07 US ft
● Target Length: 1.68 US ft
● Target Shadow: 8.39 US ft
● Classification1: Piling
41° 22.30990'' N 072° 05.71450'' W (WGS84)
● Click Position
● Map Projection: CT83F
(X) 1179711.65 (Y) 696888.86 (Projected Coordinates)
Dimensions and attributes
● Target Height: 1.17 US ft
● Target Width: 0.75 US ft
● Target Length: 0.84 US ft
● Target Shadow: 5.28 US ft
● Classification1: Pilings
● Description: Two pilings side by side.
41° 22.30465'' N 072° 05.72083'' W (WGS84)
● Click Position
● Map Projection: CT83F
(X) 1179682.94 (Y) 696856.74 (Projected Coordinates)
Dimensions and attributes
● Target Height: 0.23 US ft
● Target Width: 0.36 US ft
● Target Length: 22.33 US ft
● Target Shadow: 1.46 US ft
● Classification1: Beam
● Description:
41° 22.30832'' N 072° 05.71586'' W (WGS84)
● Click Position
● Map Projection: CT83F
(X) 1179705.53 (Y) 696879.23 (Projected Coordinates)
Dimensions and attributes
● Target Height: 0.61 US ft
● Target Width: 0.93 US ft
● Target Length: 4.78 US ft
● Target Shadow: 2.95 US ft
● Description: Appears to be on angle
41° 22.30609'' N 072° 05.71803'' W (WGS84)
● Click Position
● Map Projection: CT83F
(X) 1179695.72 (Y) 696865.57 (Projected Coordinates)
Dimensions and attributes
● Target Height: 3.43 US ft
● Target Width: 6.52 US ft
● Target Length: 6.04 US ft
● Target Shadow: 10.69 US ft
● Classification1: Hump
● Description: Likely includes debris
41° 22.30113'' N 072° 05.70731'' W (WGS84)
● Click Position
● Map Projection: CT83F
(X) 1179744.97 (Y) 696835.82 (Projected Coordinates)
Dimensions and attributes
● Target Height: 0.90 US ft
● Target Width: 17.01 US ft
● Target Length: 45.60 US ft
● Target Shadow: 5.32 US ft
● Classification1: Debris field
● Description:
41° 22.31380'' N 072° 05.68994'' W (WGS84)
● Click Position
● Map Projection: CT83F
(X) 1179823.82 (Y) 696913.36 (Projected Coordinates)
Dimensions and attributes
● Target Height: 2.06 US ft
● Target Width: 4.09 US ft
● Target Length: 0.83 US ft
● Target Shadow: 9.93 US ft
File details come from the government source that posted it. Updated .