Response to RFI No.3 Attachment Chebeague Video May2022 (1).pdf
PDF 3 MB Posted
- Solicitation number
- W912WJ23B0003
About this file
This document includes an underwater video survey of Great Chebeague Island in Casco Bay, Maine and details of a related federal contract opportunity for dredging work. The underwater video survey document provides plan and profile camera images from stations P1 through P12 located in the project area. The images note bottom composition and conditions including sediment type, debris, and aquatic vegetation at each station.
The associated federal contract opportunity is for improvement dredging of approximately 4,000 cubic yards of mixed sediments from the 10-foot channel/turning area and 8-foot turning basin near Great Chebeague Island. The work includes mechanical dredging and transport of materials via scow to the Portland Disposal Site approximately 15 nautical miles away. The available dredging window is from 1 November 2023 to 31 December 2023 and will require coordination with tide cycles. Environmental review and permitting has been completed by the U.S. Army Corps of Engineers, New England District.
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Other files
| File | Type | Posted |
|---|---|---|
| Bid Abstract.pdf | ||
| W912WJ23B0003 Amendment 001.pdf |
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Text version
MAY 2022 UNDERWATER VIDEO SURVEY
IMAGE DATABASE
GREAT CHEBEAGUE ISLAND
NAVIGATION IMPROVEMENT PROJECT
CASCO BAY, MAINE
May 2022
Prepared by:
Planning Division Marine Operations Program
U.S. Army Corps of Engineers New England District
Concord, Massachusetts
8 FOOT TURNING BASIN
10 FOOT CHANNEL
P9 P8
P7
P6
P5
P4
P3
P2
P1
P12
P11
P10
G
F
E
D
C
B
A
70°6'30"W
70°6'30"W
FIGURE 1:
GREAT CHEBEAGUE ISLAND
2021-2022 PROBE LOCATIONS
2018 NAIP AERIAL IMAGERY
0 10 20 30 40
Meters
1:750
US Army Corps of Engineers New England District
0 50 100 150 Feet
Falmouth
Cumberland
Portland
Yarmouth
Lon g I.
Grea t
Cheb eag ue I.
Cous ins
I.
GCS NAD 1983
Legend
Channel Boundary 2022 Probe Location!/
-8 Foot Contour -9 Foot Contour
2021 Probe Location!/
DEPTH (FT MLLW)
+5 0 5 10 15
Survey Area: Great Chebeague Island Station: P1
Date: 5/19/2022 Vessel: R/V Gloria H. Platform: 0.25m2 drop frame - plan and profile cameras
Latitude: (NAD83): 43.751310 Longitude (NAD83): -70.108410 Water Depth (FT MLLW): -9.6
Plan View Profile View
Notes:
Soft, loose bare silt with sparse eelgrass wrack.
Survey Area: Great Chebeague Island Station: P2
Latitude: (NAD83): 43.751455 Longitude (NAD83): -70.107966 Water Depth (FT MLLW): -9.2
Silt with sparse shell hash and macroalgae and eelgrass wrack.
Survey Area: Great Chebeague Island Station: P3
Latitude: (NAD83): 43.751537 Longitude (NAD83): -70.107924 Water Depth (FT MLLW): -2.6
Silt with sparse to moderate shell hash and eelgrass wrack.
Survey Area: Great Chebeague Island Station: P4
Latitude: (NAD83): 43.751331 Longitude (NAD83): -70.107936 Water Depth (FT MLLW): -5.6
Silt with sparse to moderate organic debris and eelgrass/ macroalgae wrack.
Survey Area: Great Chebeague Island Station: P5
Latitude: (NAD83): 43.751243 Longitude (NAD83): -70.107931 Water Depth (FT MLLW): -4.3
Bare silt with a large linear fissure running through the quadrat. Sparse eelgrass wrack present.
Survey Area: Great Chebeague Island Station: P6
Latitude: (NAD83): 43.751149 Longitude (NAD83): -70.107952 Water Depth (FT MLLW): -6.7
Bare silt with sparse shell hash and eelgrass wrack.
Survey Area: Great Chebeague Island Station: P7
Latitude: (NAD83): 43.751069 Longitude (NAD83): -70.107712 Water Depth (FT MLLW): +2.0
Medium to large cobbles with sparse cover of Northern rock barnacle (Semibalanus balanoides).
Moderate to dense cover of rockweed (Ascophyllum nodosum) attached to the cobbles.
Survey Area: Great Chebeague Island Station: P8
Latitude: (NAD83): 43.750978 Longitude (NAD83): -70.107763 Water Depth (FT MLLW): +0.7
Medium to large cobbles with sparse cover of Northern rock barnacles. Sparse shell fragments present within the cobbles.
Survey Area: Great Chebeague Island Station: P9
Latitude: (NAD83): 43.750957 Longitude (NAD83): -70.107654 Water Depth (FT MLLW): +2.2
Medium to large cobbles with moderate to dense cover of Northern rock barnacles.
Survey Area: Great Chebeague Island Station: P10
Latitude: (NAD83): 43.750774 Longitude (NAD83): -70.107943 Water Depth (FT MLLW): -9.7
Bare silt with protruding clay mounds.
Survey Area: Great Chebeague Island Station: P11
Latitude: (NAD83): 43.750838 Longitude (NAD83): -70.107952 Water Depth (FT MLLW): -10.3
Bare silt with protruding clay mounds. Mud crab (Xanthidae sp.) present.
Survey Area: Great Chebeague Island Station: P12
Latitude: (NAD83): 43.751172 Longitude (NAD83): -70.108274 Water Depth (FT MLLW): -11.8
Silt with organic debris and macroalgae wrack.
| MAY 2022 UNDERWATER VIDEO SURVEY |
| IMAGE DATABASE |
| CASCO BAY, MAINE |
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