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Project Background

MARTIN COUNTY HURRICANE AND STORM DAMAGE REDUCTION PROJECT, NEW BORROW AREA HUTCHINSON ISLAND, MARTIN COUNTY, FLORIDA. Project Background. Authorizes construction of a protective and recreational beach along 4 miles of shorefront from the St. Lucie County line to Stuart Public Beach Park.

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Project Background

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  1. MARTIN COUNTY HURRICANE AND STORM DAMAGE REDUCTION PROJECT, NEW BORROW AREAHUTCHINSON ISLAND, MARTIN COUNTY, FLORIDA

  2. Project Background Authorizes construction of a protective and recreational beach along 4 miles of shorefront from the St. Lucie County line to Stuart Public Beach Park.

  3. Purpose and Need • Reduce storm damages and beach erosion • Maintain an area suitable for recreation and wildlife habitat/sea turtle nesting. • Maintain commerce associated with beach recreation in Martin County. Hurricanes and Tropical Storms Passing within 200 Miles of Martin County 1971 to 2007

  4. Purpose and Need Damage to project area after Hurricanes Frances and Jeanne in 2004. Hutchinson Island has long been recognized as an important loggerhead turtle rookery (NMFS and USFWS, 1991).

  5. Project History

  6. Description of Proposed Action • Since the borrow area on Gilbert Shoal has been fully utilized, alternative sand sources need to be identified and approved to provide enough beach-compatible sand for the remaining period of federal cost-sharing participation.

  7. Alternatives: Sand Sources Potential Sand Sources: Upland – existing sand mines Offshore – designated borrow area Three offshore areas (C1-A, C1-B, and C1-C) and several upland areas were evaluated as potential sand sources for this project.

  8. Comparison of Sand Sources

  9. Studies Conducted in Affected Environment • Wave Modeling – STWAVE • Nearshorehardbottom mapping • Geotechnical – Vibracores • Sidescan Sonar/Magnetometer Surveys • Diving/Groundtruthing • Regional Fishery Resource Survey • Sea Turtle Monitoring • Mitigation Reef Monitoring Vibracores and dive survey Borrow Area C1-B

  10. Preferred Offshore Borrow Area • C1-B is the preferred borrow area • Least amount of vertical relief compared to C1-A and C1-C • Material is beach-compatible • 2012 project requires approximately 787,000 cy of material Sand sample from Borrow Area C1-B

  11. Mitigation Measures Approximately 6.0 acres of nearshore artificial reef was created in 2000 to offset impacts on nearshorehardbottom resources during initial project construction and any secondary impacts during sand equilibration.

  12. Monitoring Requirements • Physical Monitoring: • Topographic and Bathymetric Surveys – Beach and Offshore • Aerial Surveys • Biological and Environmental Monitoring: • Sediment Compaction • Escarpment Formation • Sea Turtle Nesting • Beach Lighting • NearshoreHabitat and Mitigation Reefs • Turbidity

  13. Poster Stations • 1. Project Overview: Project description and why is beach renourishment important along the Treasure Coast (economics, quality of life, storm damage), EIS/NEPA process, and timeline • Sea Turtle Protection: Nesting habitat, historical use, turtle-friendly beach fill design, monitoring plan • Sand Source/Modeling/Geotech: Sand samples, bathymetry and wave analysis results, video footage • Nearshore Habitat/Monitoring Requirements: Nearshorehardbottom, mitigation reefs, Essential Fish Habitat

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