MIAMI HARBOR DEEP DREDGE PROGRAM
PRESENTED NOVEMBER 2013 Where We Are Today Miami Harbor, PortMiami 3 Timeline Partnership with the US Army Corps of Engineers
March 2007 September 2003 FDEP meeting in January November 2000 Two public Tallahassee to 2000 Meeting to April 2003 workshops on discuss May 2012 Information present preliminary Notice of blasting minimization of FDEP Permit letter results of baseline Availability reef impacts issued resource survey for Draft EIS 2009-2011 PED
2000 2001 2002 2003 2004 2005 2006 2007 2009 2010 2011
August 2001 May 2003 Nov 2004 August 2006 October 2009 March 2000 NOI Issued Public CZMA Lessons Pre-application Resource for Draft EIS meeting meeting Learned meeting in agency presents Meeting Tallahassee meeting July 2002 rules of Phase 2 Resource Draft EIS dredging Agency Meeting during ARB
1999 Study Authorized by Congress 2004 General Reevaluation Report Completed 2006 Record of Decision/Final EIS 2007 Congress Authorized Navigation Reevaluation Report Plan Selection/NEPA
• Ship Simulation Studies • Understanding cross currents effects and navigability. • Avoid and Minimize impacts to natural resources • Deepening and minimized widening final recommended Plan. Di Lido Island San Marino Island Belle Island Biscayne Island NAVIGATION
San Marco MIAMI BEACH Island Rivo Alto Island CONCERNS Turning Basin EXISTING PROJECT Existing Federal Channel DEPTHS
DODGE ISLAND CROSSCURRENTS
CROSSCURRENTS
LUMMUS ISLAND
Fisherman’s Channel
TIDAL FLOW
SURGE EFFECTS & OPERATION CONSTRAINTS
VIRGINIA KEY
1. Hydrodynamic Constraints 2. Economic Drivers
US ARMY CORPS OF ENGINEERS | Jacksonville District BUILDING STRONG® Identifying Direct Resource Impacts
Data Collected/Used Data Interpretation
• Bathymetric surveys • GIS mapping tools • Hardbottom diver surveys • Habitat classification datasets • Lidar surveys, including 2009 • Channel boundary NOAA surveys delineations • Side scan sonar surveys • Side slope estimation • Spot dive surveys along entire channel • Video of entire channel bottom • Aerial photography Identifying Direct Impacts Local Environmental Resource Agency (DERM) Channel Bottom Spot Check Site 1: Rock/Rubble
Site 6: Mostly Sand Identifying Impacts
Side slope cross section
Seagrass Impacts -Direct Impact 0.2 acres -Indirect Impact 7.7 acres 10
Di Lido Island San Marino Belle Island Biscayne Island Island Where we are
San Marco MIAMI BEACH Rivo Alto Island Tomorrow! Island Turning Basin Deep Dredge DODGE ISLAND
Option B Project LUMMUS ISLAND
Fisherman’s Channel Option A Base Contract
Option A
Base Contract Option A Option B
Widen seaward portion Cut 3 station 0 to Cut 3 Cut 3 station 12 to of Cut-1 from 500 to 800 station 12 and Fisherman’s Channel feet; deepen Cut-1 and Fisherman’s Channel station 17; Local Cut-2 from -44 to -52 Station 17 to Lummus sponsor berthing areas feet; reef and seagrass Island Turning Basin F.C. station 8 to 17; mitigation area end; deepen from -42 deepen from -42 to -50 construction. to -50 feet feet Project Scope
– Approximately 5,000,000 CY of dredging • EPA designated offshore site • Rock material for artificial reef habitat • Borrow sites for seagrass mitigation – Estimate 4,000,000 CY of Rock – Confined Blasting will be Allowed
N EPA Designated Offshore Disposal Area Miami OFFSHORE DREDGED Miami Beach MATERIAL DISPOSAL SITE Miami Harbor, Port of Miami Florida Virginia Key Government Cut Legend EXISTING ARTIFICIAL Cape Florida REEF SITES Julia Tuttle Seagrass Mitigation Area
. Seagrass Mitigation Site . Location is previous dredge material borrow site for causeway construction (pre 1925) . Turbidity Curtains surrounding placement location . Restoration of 16.6 acres of seagrass, 7.15 acres to be planted
Fisherman’s Channel Artificial Reef Mitigation Areas
Reef Mitigation Sites have capacity of 40 acres
OFFSHORE ARTIFICIAL REEF MITIGATION AREAS
ADJACENT SUCCESSFUL ARTIFICIAL REEF MITIGATION SITE Mitigation for Hardbottom Impacts
• Artificial Reef Creation – 9.28 acres • Coral Relocation • All hard corals >25cm • Up to 1300 hard corals between 10 and 25 cm
Construction Environmental Resource Monitoring •Turbidity Monitoring •Sedimentation Monitoring •Secondary Impacts •Hardbottom and Corals Natural Turbidity in the Bay •Seagrass Beds •Divers in-water twice a week to monitor resources Typical Sedimentation Station Sedimentation Monitoring
X1 N X2 N X1 S X2 X3 S S
• Move dredge if issue detected
Confined Blasting will be allowed Confined vs. Unconfined Blasts 7 pounds of explosives 3000 pounds UNCONFINED of explosives CONFINED Monitoring Zones
Average Zone Configuration for Miami Harbor Phase II Underwater Blasting
R = 260 (cube root W) R = Safety Radius W = Weight of explosives
•Danger Zone Radius = 260 (lbs/delay)
Radius •Safety Zone Radius = Configuration 520 (lbs/delay) Formula
•Watch Zone Radius = 3[260 (lbs/delay)]
Project Schedule
• May 2013 – Contract Award to Great Lakes Dredge & Dock • July 2013 – Notice to Proceed • Summer/Fall 2013 – Environmental Baseline Surveys • Today – Dredging Starts! • Summer 2015 Complete Work
Thank You
For more information visit our website www.miamidade.gov/portofmiami