Project ID Number is 92
A. General Information
Suggestion State:
Entity/Sponsor:
Town of Dauphin Island
Organization Website:
http://www.townofdauphinisland.org
Contact Name:
Jeff
Collier
Title:
Mayor
Contact Address:
1011 Bienville Blvd
Dauphin Island
,
AL
36528
Phone Number:
251-861-5525
Email:
dialgovmt@townofdauphinisland.org
Suggestion State:
Reviewed
Suggestion Date:
4/15/2014
B. Project Classification - Primary
Ecological/Environmental (Including Water Quality)
C. Project Classification - Secondary
Economic
|
Coastal Flood Protection
|
Infrastructure
D. Project Information
Project Name:
West End Beach and Barrier Island Restoration Project
Project Location:
Dauphin Island
Project State(s):
AL
County(s):
Mobile
Watershed/Basin:
n/a
Latitude:
30.25
Longitude:
-88.17
E. Project Description
The Town of Dauphin Island proposes to widen the beach at its natural elevation and install a dune system using an offshore sediment source. The objective of the restoration project is to increase island longevity and reduce overwash by nourishing the beach and dune system. In addition, the project would protect existing infrastructure and habitats that would otherwise be subject to degradation if the current land loss trends continued. The project area extends west from the current pier near monument DI-18 to monument DI-2. Beach fill will be hydraulically dredged from an offshore borrow area located in the Gulf of Mexico about a mile south-southwest of the Sand Island Lighthouse and pumped to the project area. The beach fill extends along approximately 4.25 miles of shoreline and requires approximately 3.59 million cubic yards to construct based on surveys conducted in July 2010. The fill template is designed seaward of the existing houses and infrastructure. Between DI-2 and DI-16, the template has a 25 foot wide dune crest at an elevation of +12.0 feet, NAVD with side slopes of 1V:5H. To protect the dune, a beach berm extends approximately 300 feet seaward at an elevation of +5.5 feet, NAVD. The beach berm has a 1V:12H slope to the seaward construction toe of fill. The construction template will shift the MHW shoreline an average of 427 feet seaward of its existing condition. Between DI-16 and DI-18, the existing beach widens and the fill template is designed on top of the existing profile warranting only the dune portion to be constructed. Transport of excavated material from the borrow area to the project area will occur with a hopper dredge or hydraulic dredge through a series of submerged, floating and shore-supported pipelines. Once deposition of material occurs at the fill site, the contractor will move the sand using heavy equipment to shape the beach to the design cross-sections. Final design volume will be based upon pre-construction surveys. Three levels of projects are proposed: one,a full restoration to historic condition; two a partial restoration to historic conditions; and three, a restoration that will hold existing conditions. The cost of each level of project is estimated at $59, $38, and $21 M respectively.
F. Water Quality Projects and Ecological Benefits
G. Resiliency Considerations (Ecological; Social-Ecological; Social; Socio-Economic and/or Community Resilience)
H. Project Status
Property/Resource Acquisition:
Current Landowner or Holder of the Easement:
The Town of Dauphin Island and multiple private property owners
Recent Appraisal?
No
Project Planning/Design:
In Progress
Project Permitting
Permit
Stage
Joint Coastal Construction Permit was put on hold
Applied For
Project will take
4
Months to Begin and an additional
12
Months to Complete
Can be implemented in phases?
No
No Phases
Is this project included under a regional or statewide plan/initiative?
Yes
If so, list:
Coastal Recovery Commission of Alabama report (2010)
Project Feasibility and Likelihood of Success:
Leveraging/Complementary Projects:
I. Project Cost
Estimated Cost:
$58,601,000.00
Maintenance/Operational Cost:
$0.00
Nature of Cost:
tbd
Sources for Funding Costs:
tbd
Level of Confidence:
Medium
New business startup or expansion?
No
Basis/Method of Estimation:
completed engineering study (2011)
Matching Funds Available:
No Matching Funds
Project Partners:
No Project Partners Entered.
J. Project Impact on Community
Community Need:
This project will permanently add up to 4 million cubic yards of sand to the beach and barrier island system of the state
Avoided Costs:
Hurricane and storm surge damages to upland properties, infrastructure, and habitat will be mitigated.
Indirect Benefits:
Increases in tourism, increased protection of upland areas and wetlands.
Environmental Benefits:
This project will create acres of new public beach and dune habitat which will be improved habitat. This project will also significantly reduce the likelihood, frequency and extent of breaches in the west end of Dauphin Island.
Environmental Impacts:
limited as per agencies through permit process to date
Project Monitoring and Performance:
The measure of success will be in the mileage of new public beaches and the acres of new habitat
K. Resource Benefit(s):
Benefit(s):
Shellfish
|
Birds
|
Terrestrial Wildlife
|
Sediment/Benthos
|
Reptiles/Amphibians
|
Shoreline
|
Fish
|
Vegetation
Benefit State- or
Federally-listed Species?
Yes
If so, list:
Piping plover. Loggerhead sea turtle. Leatherback sea turtle. Kemp’s Ridley sea turtle. Green sea turtle