Unique Dredging and Placement Projectsaapa.files.cms-plus.com/SeminarPresentations...Deer Island BU...
Transcript of Unique Dredging and Placement Projectsaapa.files.cms-plus.com/SeminarPresentations...Deer Island BU...
Unique Dredging and Placement Projects1
Unique Dredging and Placement
Projects
Presented by
Wendell Mears
October 22, 2015
Unique Dredging and Placement Projects2
• Dredging Basics, A Short Review
• On-site Aquatic Placement
• Confined Aquatic Disposal
• Beneficial Use Sites
• Coastal Mississippi: An Update
Presentation Overview
Unique Dredging and Placement Projects3
In situ, Intermediate, and End State
Review—A Yard Is Not a Yard Is Not a Yard
Unique Dredging and Placement Projects4
On-site Placement
Unique Dredging and Placement Projects5
Inner Harbor Berths
Unique Dredging and Placement Projects6
Dredging Method
Unique Dredging and Placement Projects7
Commercial Landfill
• Regulations
– Federal: U.S. Environmental
Protection Agency (USEPA)
– State: DEP, DEQ, etc.
– Local
• Processing for transport
– Additives (e.g., Portland cement,
etc.)
• Transport
– Marine
– Truck
– Rail
Unique Dredging and Placement Projects8
On-site Placement
• Regulations
– Federal: USEPA
– State: DEP, DEQ, etc.
– Local
• Transport
– Barge
– Truck and rail
– Conveyor
Unique Dredging and Placement Projects9
On-site Placement
• Measurement and payment
– Cubic yard (CY) in situ
• Liabilities and risks
– Owner vs. landfill
– Managed risks
• Contaminant stability
– AVS SEM
– Hydric conditions
Unique Dredging and Placement Projects10
On Site Placement for Restoration
• Location
• Size
• Sediment Properties
• Dredge Size
• Decant & Water Quality
• Return Waters
• Operations & Management
Location, location, location
Unique Dredging and Placement Projects11
Confined Aquatic Sites
Unique Dredging and Placement Projects12
Unique Dredging and Placement Projects13
13
Port Hueneme Impacted Sediment Locations
Oxnard Harbor District
Naval Base Ventura County
USACE Federal
Channel
Unique Dredging and Placement Projects14
14
Construction Sequence
Naval Base Ventura County
Oxnard Harbor District
Unique Dredging and Placement Projects15
15
Step 1: Excavate
Cell
Beach
Nourishment
CAD Excavation
Unique Dredging and Placement Projects16
16
Step 2: Place Contaminated
Sediment in Cell
Contaminated Sediment Dredging
Unique Dredging and Placement Projects17
17
Step 3: Place Cap
Material
CAD Cell Capping
Unique Dredging and Placement Projects18
Port Hueneme CAD Cross Section
-85’ MLLW
-56’ MLLW
-46’ MLLWClean
Cap
Contaminated
Sediments
-43’ MLLW
Unique Dredging and Placement Projects19
Beneficial Use Sites
Unique Dredging and Placement Projects20
Beneficial Use (BU)
• Beach nourishment
• Agriculture and products
– Topsoil
– Aquaculture
• Berms
– Stable and feeder
• Land creation
• Land improvement
• Marsh and intertidal habitat
Unique Dredging and Placement Projects21
BU Marsh Design
• Design Considerations
– Foundation
– Dredge material properties
– Placement methods
– Density phases
• Lessons learned
– Marsh now
– Larger sites and adaptive
management
Unique Dredging and Placement Projects22
Coastal Mississippi: An Update
Unique Dredging and Placement Projects23
• 2001 & 2002
– USACE and DMR identify potential BU sites
– Develops Master Plan for BU in Mississippi
– Deer Island identified as a pilot project and completed in 2003
• 2008
– Beneficial Users Group (BUG) formed
– State and federal agencies, co-chaired by DMR and USACE
– Private stakeholders (e.g., local ports)
• 2010
– BUG recommends revised legislation
– House Bill 1440 passed March 2010
– Coastal Wetlands Protection Act § 49-27-61,
History and the BU Law
Unique Dredging and Placement Projects24
Deer Island Marsh Creation
Project: 2001 to 2003
• Components:
– 7- to 8-foot-high dike
– Easterly wing dike
– Flash board riser weirs
– Offset to provide bayou
• Dredged material from Biloxi
Lateral Channel
• Approximately 40 acres were
filled with 365,000 cy of
sediment
Unique Dredging and Placement Projects25
Pre-Katrina
Unique Dredging and Placement Projects26
Post-Katrina
Unique Dredging and Placement Projects27
Deer Island BU and Port of Gulfport 2012
• Designed with DMR, Port, and
Stakeholders
• USACE rebuilt existing cell under
MsCIP
• Refill existing BU cell and construct
additional expansion area BU cell
– Open at the western end to encourage
circulation and habitat development
– Can be expanded for additional material
– Mimics the historic 1850s footprint
– Intertidal plant species
– Chenier for nesting
Unique Dredging and Placement Projects28
Port of Gulfport—2012 Restoration
Unique Dredging and Placement Projects29
Deer Island BU Construction 2012
Unique Dredging and Placement Projects30
Port of Gulfport—2012 Restoration (cont.)
Unique Dredging and Placement Projects31
Current Views
Unique Dredging and Placement Projects32
Current Views
Unique Dredging and Placement Projects33
BU to Enhance Existing Marsh
Illustration of conceptual model for marsh
recovery after thin-layer disposal
Unique Dredging and Placement Projects34
Regional Sediment Management Sites