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Unique Dredging and Placement Projects1

Unique Dredging and Placement

Projects

Presented by

Wendell Mears

October 22, 2015

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• Dredging Basics, A Short Review

• On-site Aquatic Placement

• Confined Aquatic Disposal

• Beneficial Use Sites

• Coastal Mississippi: An Update

Presentation Overview

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In situ, Intermediate, and End State

Review—A Yard Is Not a Yard Is Not a Yard

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On-site Placement

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Inner Harbor Berths

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Dredging Method

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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

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On-site Placement

• Regulations

– Federal: USEPA

– State: DEP, DEQ, etc.

– Local

• Transport

– Barge

– Truck and rail

– Conveyor

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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

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On Site Placement for Restoration

• Location

• Size

• Sediment Properties

• Dredge Size

• Decant & Water Quality

• Return Waters

• Operations & Management

Location, location, location

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Confined Aquatic Sites

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Port Hueneme Impacted Sediment Locations

Oxnard Harbor District

Naval Base Ventura County

USACE Federal

Channel

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Construction Sequence

Naval Base Ventura County

Oxnard Harbor District

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Step 1: Excavate

Cell

Beach

Nourishment

CAD Excavation

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Step 2: Place Contaminated

Sediment in Cell

Contaminated Sediment Dredging

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Step 3: Place Cap

Material

CAD Cell Capping

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Port Hueneme CAD Cross Section

-85’ MLLW

-56’ MLLW

-46’ MLLWClean

Cap

Contaminated

Sediments

-43’ MLLW

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Beneficial Use Sites

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Beneficial Use (BU)

• Beach nourishment

• Agriculture and products

– Topsoil

– Aquaculture

• Berms

– Stable and feeder

• Land creation

• Land improvement

• Marsh and intertidal habitat

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BU Marsh Design

• Design Considerations

– Foundation

– Dredge material properties

– Placement methods

– Density phases

• Lessons learned

– Marsh now

– Larger sites and adaptive

management

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Coastal Mississippi: An Update

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• 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

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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

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Pre-Katrina

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Post-Katrina

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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

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Port of Gulfport—2012 Restoration

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Deer Island BU Construction 2012

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Port of Gulfport—2012 Restoration (cont.)

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Current Views

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Current Views

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BU to Enhance Existing Marsh

Illustration of conceptual model for marsh

recovery after thin-layer disposal

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Regional Sediment Management Sites

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Questions /Discussion

wmears@anchorqea.com