A21 - NOFE-AMDT0002-W912PM23B0018-BACK-SOUND-DREDGING-Tech-Summary.pdf
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- Attached to
- Back Sound to Lookout Bight Maintenance Dredging Federal contract opportunity
- Solicitation number
- W912PM23B0018
About this file
This technical summary document provides details for Amendment 0002 to Solicitation Number W912PM23B0018 for maintenance dredging services in Back Sound to Lookout Bight. The amendment revises drawing CN105 to display the full extent of submerged aquatic vegetation limits for the "Sandbag Island" bird island placement area. Dredged material will be placed along the north and northeast side of "Sandbag Island" using proposed geotextile tubes approximately 15 feet wide, 50 feet long, and 5 feet high, as shown on the revised drawing. Ground truth investigation of submerged aquatic vegetation was performed in November 2022. The contract will be awarded by the Department of the Army Corps of Engineers Wilmington District.
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Solicitation # W912PM23B0018 Date: 20-OCTOBER-2023 Project Title – BACK SOUND TO LOOKOUT BIGHT MAINTENANCE DREDGING Amendment No. 0002
P a g e 1 | 1
SUMMARY OF CHANGES
1. CHANGES TO SPECIFICATIONS.
A. No change to Specifications.
2. CHANGES TO DRAWINGS. Attached hereto are [new and revised] drawing sheets.
A. REVISED DRAWINGS (ISSUED).
a. CN105 – "SANDBAG ISLAND" BIRD ISLAND PLACEMENT AREA
i. Replace sheet in entirety per bidder inquiry/Amendment. Drawing revised to display full SAV limits.
…end of summary…
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SSF
SSF
SSF
SSF
SSF
SSF
SSF
SSF
SSF
SSF
SSF
SS
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SSF
CONSTRUCTION LIMITS
APPROXIMATE TOE OF FILL
SEAWARD EDGE OF BERM
ELEV. +15' (NAVD88)
225'
CONSTRUCTION BASELINE
SUB-AQUATIC VEGETATION
(SAV)
GROUND TRUTHED
SAV PERIMETER
N: 346,399.4 E: 2,742,527.2
N: 346,459.2 E: 2,742,678.5
N: 346,456.5 E: 2,743,011.1
N: 346,274.2 E: 2,743,292.0
N: 346,103.4 E: 2,743,442.4
N: 345,821.8 E: 2,743,481.7
N: 345,522.3 E: 2,743,492.4
N: 345,388.9 E: 2,743,395.5
N: 345,265.5 E: 2,743,205.5
N: 345,235.3 E: 2,743,085.7
N: 345,274.9 E: 2,743,025.2
N: 345,514.5 E: 2,742,836.1
N: 345,750.1 E: 2,742,677.2
N: 346,085.4 E: 2,742,456.3
N: 346,258.6 E: 2,742,426.3
N: 346,331.2 E: 2,742,447.1
N: 346,490.8 E: 2,742,854.0
APPROXIMATE GEOTEXTILE TUBE PLACEMENT
APPROX. DIMENSIONS: 15'W x 50'L x 5'H
APPROX. 75 TOTAL FOR SINGLE LAYER
N: 346,541.0 E: 2,742,067.5
N: 345,511.3 E: 2,742,928.6
N: 345,067.9 E: 2,743,170.0
N: 345,584.3 E: 2,742,867.6
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GENERAL SHEET NOTES
1. SEE SPECIFICATION SECTION 01 57 19, PARAGRAPH EROSION AND SEDIMENT
CONTROL MEASURES FOR "SANDBAG ISLAND" FOR MONITORING
REQUIREMENTS DURING PLACEMENT OPERATIONS FOR BIRD ISLAND
PLACEMENT.
2. DREDGED MATERIAL IS TO BE PLACED ALONG THE NORTH & NORTH EASTERN
SIDE OF "SANDBAG ISLAND". SEE SPECIFICATION SECTION 35 20 23,
PARAGRAPHS "ISLAND PLACEMENT", "SANDBAG ISLAND PLACEMENT AREA",
"DREDGED MATERIAL PLACEMENT PLACEMENT PLAN", AND SHEET CN501 FOR
DETAILS ON DISPOSING DREDGED MATERIAL.
3. GEOTEXTILE TUBES SHOWN ARE FOR PRELIMINARY PURPOSES. THEY SHALL
BE SIZED AND INSTALLED IN ACCORDANCE WITH MANUFACTURES
RECOMMENDATIONS AND SPECIFICATION SECTION 31 05 19.13.
4. CROSS SECTIONS CAN BE FOUND ON SHEETS CN301 & CN302.
5. THE SIDE SLOPES SHALL HAVE A NATURAL SLOPE, BUT SHALL NOT EXTEND
PAST A SLOPE RATIO OF 4H:1V DUE TO DREDGED MATERIAL
CHARACTERISTICS. ANY SLOPE GREATER THAN THIS HAS THE POTENTIAL FOR
FAILURE..
6. GROUND TRUTH INVESTIGATION FOR SUBMERGED AQUATIC VEGETATION (SAV)
PERFORMED NOV. 2022.
7. FOR THE PURPOSE OF THIS CONTRACT THE TERM BIRD ISLAND AND SANDBAG
ISLAND ARE USED INTERCHANGEABLY.
LEGEND
CONSTRUCTION LIMITS
TOP OF BERM
TOE OF FILL
PROPOSED GRADE SLOPE &
DIRECTION
SUB- AQUATIC VEGETATION
(SAV)
SCALE: 1"=100'
TOP OF BERM
ELEV. = +15' (NAVD88)
EXISTING GROUND
4 MAX.
PROPOSED FILL
TYPICAL BIRD ISLAND PLACEMENT DETAIL
N.T.S.
GEOTEXTILE TUBE
Feet 0 100 200
PROPOSED GEOTEXTILE TUBE
SSF SSF PROPOSED TURBIDITY CURTAIN
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| AMDT0002 TECHNICAL SUMMARY CHANGES |
| CN105_Sandbag_Island_AMD002 |
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