alternative sediment remediation authorities to cercla: elizabeth river demonstration robert engler...
TRANSCRIPT
![Page 1: Alternative Sediment Remediation Authorities to CERCLA: Elizabeth River Demonstration Robert Engler (rengler@moffattnichol.com) Moffatt & Nichol), Vicksburg,rengler@moffattnichol.com)](https://reader036.vdocuments.us/reader036/viewer/2022070403/56649f305503460f94c4a6ff/html5/thumbnails/1.jpg)
Alternative Sediment Remediation Authorities to CERCLA: Elizabeth River
DemonstrationRobert Engler ([email protected]) Moffatt &
Nichol), Vicksburg, Mississippi, (USA)
Eric Smith ([email protected]), Baltimore, Maryland, (USA)
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Alternative Sediment Remediation Permitting Authorities • Full and Continuing Coordination with Federal, State, Local permitting
and Review Agencies and the Elizabeth River Project at the Outset of Project.
• Full Commercial Navigation Requirements Must Be Maintained.
• Pre-operational Assessmento Clean Water Act – CWA (USACE Guidance/Reviewo VA DEQ, DCR, VIMS, DGIF, MRC Guidance/Review
• Dredgingo USACE, Section 10, Rivers and Harbors Act (R&HA),
Clean Water Act 404(b)1 Guidance, Manualso VA DEQ CWA, Water Quality Certificationo VA DCR Oversighto VIMS Review
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• Dredge Material Rehandling/Treatment/Disposalo VA Authorized Land Fill Rules; Land Farming/Solidification and
stabilizationo TSCA – VA Rules
• Capping/Wetlands Restoration, Oyster Habitato USACE, Section 10 R&HA, CWA 404(b)1 Guidance, Manualso VA DEQ, CWA – Water Quality Certificationo VA – DCR, DGIF, MRC Oversighto VIMS Review
• Source Control/Air Qualityo VA Regulations
• USEPA Guidance and Oversight as Appropriate Under CWA
• Threatened and Endangered Species Coordination – VA DNR, USNMFS, USF&WS
• Essential Fish Habitat – VA DNR, USWMFS, USF&WS
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Landscape Approach
Forested Upland
Wetlands Restoration
Oyster Reef Creation
Sediment Cleanup
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Republic ERM
CLEANUP GOALS
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Remediation Methods
Natural Recovery
Removal of Sediments (Dredging)
Isolation and Containment of Sediments
(Capping)
Combination of Above
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Dredged Material Management
1. Mechanical Dredging
2. Transport to Weanack Plantation (or other site)
3. Landfarming
4. Dewatering/Stabilization to Landfill (e.g. Charles City
County)
5. Placement at Other Approved Upland Site
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Cap Engineering Development
Chemical Isolation Modeling Follow US EPA Design Guidance Isolation of Contaminants to ERM or Less 100-Year Plus Design Life
Cap Stability Assessment Tidal and Storm Currents Ship Induced Currents Propwash
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Cap Requirements
Mixed Bioturbation Mixed Bioturbation LayerLayer
Sediment –Water Interface
Clean Sediments
Contaminated Sediments
Isolation Cap
Protection Cap
Cap thicknesses for erosion protection and chemical isolation
Focus for health benchmarks
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Isolation Cap Modeling
Used two models (both in EPA guidance) RECOVERY (v 4.3) model for design Lampert & Reible model (LRM) for confirmation
and additional tests RECOVERY
USACE developed and validated model, 20 years of use with continual updating
Numerical, time-varying, mass balance LRM
Analytical, steady-state, mass balance
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Cap Isolation Conclusion/Recommendation
12 inch sand cap is protective given the expected low groundwater upwelling rates
The 12 inch protective cap on top of isolation adds extra protection
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Cap Stability Assessment
Tidal and Storm Currents Hydrodynamic Model of Tides and Storm Surge
Ship-Induced Currents Numerical Model of Passing Ship
Propwash Analytical Calculation of Prop Scour from Tugs
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Hydrodynamic Model Domain
MIKE FM ModelIncreased Resolution in Project Area
25-YEAR HURRICANE VALIDATED
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Passing Vessel Model
Model DELPASS developed by Pinkster Marine Hydrodynamics
Panel model based on 3-d potential flow Panels represent river bathymetry and vessel Output 3 time-dependent velocity components
on grid points of the river bottom Grid points match MIKE3 model resolution
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Alternative 1 Dredge + Cap
Dredge 2’Cap 2’
2’ Sand Cap / Wetlands
Dredge 2’ w/Armored Cap
Dredge to El -39’ w/ Armored Cap
Armored Cap
Dredge 2’Cap 2’
2’ Sand Cap
Armored Cap
Dredge to El -42’
Dredge Volume 172,460 cy