Overview of the Aloe Bay Living Shorelines Project
TOWN OF DAUPHIN ISLAND
The Town of Dauphin Island, Alabama, is preparing to advertise for bids from qualified contractors for the “Aloe Bay Living Shorelines Project.” This announcement provides preliminary information to assist prospective bidders in planning. Note that the Town may adjust quantities and project features based on site conditions at the time of the official bid announcement.
Project Scope and Responsibilities
The successful contractor will be responsible for providing dredging and support vessels, labor, equipment, supplies, and all necessary materials for the following tasks:
- Sand Excavation and Placement: Excavating, transporting, placing, dressing, and grading sand fill from nearshore borrow areas.
- Breakwater Construction: Constructing nearshore segmented rock (graded rip rap) breakwaters and installing associated geogrid composites and geotextiles.
- Marina Breakwater and Walkway: Building a marina breakwater and walkway structure, along with a submerged reef breakwater.
- Tidal Creek Excavation: Excavating two tidal creeks, each approximately 150 feet long.
Estimated Quantities for the Aloe Bay Project
The project includes substantial quantities of materials and work:
- Sand Fill: Approximately 42,860 cubic yards for excavation and placement.
- Rock for Breakwaters: About 12,000 tons for breakwater construction.
- Geogrid Composite Installation: Around 10,950 square yards.
- Geotextile Fabric Installation: Approximately 2,300 square yards.
Marina Breakwater and Walkway Specifications
The marina breakwater and walkway structure will be approximately 150 feet long and 30 feet wide. This includes a 100-foot walkway with a sheet pile wall around the core perimeter, rock revetment, sand core fill, and a bedding layer. An additional 50 feet of the structure will use homogeneous rock to mitigate wave impacts for an existing boat ramp.
Shoreline Restoration and Fill Placement Sites
The project encompasses two primary shoreline restoration and fill placement sites within Aloe Bay on the north side of Dauphin Island:
- El Dorado Site: This site extends approximately 2,600 feet in a north-south direction along the shoreline, situated between Village Channel and El Dorado Avenue.
- De Soto Site: This site extends about 2,000 feet in an east-west direction, located between Jeremiah Denton Airport and the Village Channel.
Borrow Sources and Water Depths
Suitable borrow sources are located within 0.5 miles of each fill site. Water depths in these areas range from 2.5 to 5 feet, with an average depth of around 3.5 feet. The proposed cut thickness is between 3 to 7 feet. Construction is anticipated to use a small hydraulic pipeline dredge. Bidders should be aware of the shallow water depths around the fill sites. Both mechanical (clamshell) and hydraulic dredges will be permitted.
Project Timeline and Regulatory Approvals
Applications for state and federal regulatory approvals have been submitted, with permits expected to be issued between mid-June and mid-July 2024. Construction is scheduled to begin in early fall 2024 and continue until fall 2025.
This comprehensive dredging project in Dauphin Island, Alabama, aims to enhance the shoreline’s resilience and functionality, making it a significant opportunity for qualified contractors in the dredging and marine construction industry.