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Florida Inland Navigation District: Florida Inland Navigation District: Permitting and Construction of the Permitting and Construction of the M-5 Island Offloading & CrossroadsM-5 Island Offloading & CrossroadsMaintenance Dredging and the NA-1Maintenance Dredging and the NA-1Upland DMMA FacilityUpland DMMA Facility
Authored by Lori Brownell, P.E. and John Adams, P.E.Authored by Lori Brownell, P.E. and John Adams, P.E.Presented by Jim Marino, P.E., D.CEPresented by Jim Marino, P.E., D.CE
October 2012October 2012
PresentationPresentation OverviewOverview• Long-Range Planning Efforts for Florida
General Dredged Material Management Plan
Florida’s Intracoastal Waterway
Florida’s Okeechobee Waterway
• Permitting Challenges in Florida
M-5 Island Offloading and Crossroads Maintenance Dredging
NA-1 Dredged Material Management Area Construction
Long-Range Planning Efforts for FloridaLong-Range Planning Efforts for Florida• Florida Inland Navigation District (FIND) established in 1927
• Shifts in perception occurred in mid-1980s regarding dredging/dredged material management
• Taylor Engineering became the District Engineer in 1986
• Dredged Material Management Plan development guided by
Technical advisory committee
Citizens’ advisory committee
• 12 county-specific plans
• Two-phased approach
Florida’s Intracoastal WaterwayFlorida’s Intracoastal Waterway• 404 channel miles within two federally-authorized
navigation projects
• Constructed to present depths 1941 – 1961
• Environmentally diverse
• Multibillion-dollar economic impact
16 tidal entrances
5 deep-water ports
• 60 placement sites
8 beach
52 confined upland placement sites
31 properties acquired
18 operational
1 final design/permitting
2 under construction
Florida’s Okeechobee WaterwayFlorida’s Okeechobee Waterway• Expanding FIND’s DMMP
1996 and 2005 legislation added 98 channel miles (4 segments)
FIND total – 502 channel miles
• Fundamental differences between ICWW and OWW
Initially authorized and constructed for flood control/water distribution
No history of channel maintenance
Variation in lake levels
Active phosphorus load reduction effort
DMMP Permitting Challenges in Florida DMMP Permitting Challenges in Florida • DMMP Purpose: Assist the USACE with dredging operations in a manner dictated
by economic and engineering considerations, and environmental and socioeconomic constraints
• Economic and engineering considerations
Dredged Material Placement Areas (DMMAs)
Material locations (shoals)
Material volumes (cubic yards [cy])
Material types (sand, clay, silt)
• Environmental and socioeconomic constraints
Natural resources
Threatened and endangered species
Cultural resources
Adjacent land use and zoning restrictions
M-5 Island Offloading & Crossroads Maintenance DredgingM-5 Island Offloading & Crossroads Maintenance Dredging• Economic and engineering considerations
Island dredge material management area
Diverse and challenging wind and wave conditions
Tight beach compliance criteria
• Environmental and socioeconomic constraints
Adjacent aquatic water preserve
Active least tern and sea turtle nesting areas
Offshore hardbottom
Multiagency coordination – County, FDEP, USACE, NMFS, National Wildlife Refuge
Adjacent land use and zoning restrictions
• Repeat Taylor Engineering project
1997 = 625,000 cy at M-SLI A and M-SLI B
ICWW pipeline corridor
• Fundamental differences
1997 = DMMA construction
2012 = 350,000 cy between R59 and R80
Increased environmental scrutiny
Beach pipeline corridor
• Crossroads Maintenance Dredging
ICWW and OWW intersection
2 – 3 year dredging cycle
50,000 – 60,000 CY/dredging cycle
M-5 DMMA Placement
Project OverviewProject Overview
• M-5 capacity: 290,000 cy (4 – 6-yr dredging cycles)
• Intermodal area challenges
Federal channel
Wind and wave forces
Gabions
Adequate navigation depth
Seagrass
Mangroves
M-5 DMMAM-5 DMMA
• Pipeline route
Martin County easement
• Beach design challenges
St. Lucie Inlet State Park
Hobe Sound National Wildlife Refuge
St. Lucie Aquatic Preserve OFW
Vicinity of hardbottom
Sea turtles
Pipeline CorridorPipeline Corridor
NA-1 Dredged Material Management AreaNA-1 Dredged Material Management Area• Economic and engineering considerations
Variable subsurface soil conditions
Installation of wick drains
Rigorous seepage and slope stability analyses
Off-site material required for construction
• Environmental and socioeconomic constraints
Dense natural maritime hammock community
Healthy saltmarsh and freshwater wetland communities
Active planning coordination with FFWC, FWW, adjacent neighbors (Amelia Island Plantation and Fernandina Beach Municipal Airport)
Project OverviewProject Overview
NA-1 Unique Site ChallengesNA-1 Unique Site Challenges• Geotechnical conditions
ICWW dredge material placed on the eastern side of the island between 1943 and 1960
Western soils comprise medium to dense clean silty sand (3 – 9 feet below ground surface) underlain by 5 – 10 feet of very soft clayey sand
1960 Aerial Photograph
1943 Aerial Photograph
• Environmental site conditions
Narrow band of freshwater wetlands located between the eastern and western portion of the island lobes
Centrally located eagle’s nest
Summary of Settlement Analysis ResultsSummary of Settlement Analysis Results
DMMA Cross Sections DMMA Cross Sections
Western DMMA Cross Section
Eastern DMMA Cross Section
SummarySummary• Long-Range Planning Efforts for Florida
DMMP for ICWW and OWW ongoing since 1986 and 1996
Permitting and construction phases remaining
• Florida Permitting Improvements
Advance coordination
Active communication
Government-driven streamlined process
• Contact Information
Jim Marino (Jmarino@taylorengineering.com)
Lori Brownell (Lbrownell@taylorengineering.com)
John Adams (Jadams@taylorengineering.com)