Introduction to Sediment Remediation. Presented to: Lower Passaic River Community Advisory Group July 14, 2011
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1 Introduction to Sediment Remediation Presented to: Lower Passaic River Community Advisory Group July 14, 2011
2 Overview Feasibility Considerations Conceptual Site Model Dredging / Capping Dredged Material Management Design Construction
3 The Practice of Contaminated Sediment Management Remediation Risk, Inventory Navigation Depth, Width Restoration Habitat, Water Quality
4 Some Important References
5 Interpreting the Conceptual Site Model Areas of High Concentration Areas of High Inventory (Mass) Sediment Stability Considerations Receptor Pathways
6 A Simplified Look at the Sediment ZONE SOME CONTAMINANT TRANSPORT PROCESSES Water Column Biologically Active Zone Bioavailable Zone Buried Contaminated Sediments Native Geologic Materials Solids Transport Bed Load Transport Erosion / Deposition, Biological Uptake Porewater flux, Contaminant degradation Groundwater discharge
7 SEDIMENT TRANSPORT Sediment Stability Some ways to assess sediment stability include: Determine Bathymetric Changes Evaluate Sediment Texture Understand Geomorphology Estimate Storm Event Velocities Perform SedFlume or Gust Microcosm Experiments Perform Sediment Transport Modeling
8 Some Key Topics for Remedy Selection Where to Remediate: Active vs. Monitored Natural Recovery What method: Dredging vs. Capping (vs. Insitu) How to Manage the Sediments Effectiveness & Recontamination Other Site-Specific Factors NEEDS GOOD PREDICTIVE MODEL COMMON SENSE STAKEHOLDER INPUT
9 DREDGING
10 DREDGING: Feasibility & Design Considerations & Terminology Resuspension Residuals Dredged Material Management Productivity Dredge Prism Debris / Utilities / Structures Dredging Technology Delivery Techniques Navigation Slope Stability Productivity Contracting Approach
11 Dredging Advantages/Limitations (per USEPA Guidance) Advantages Lower uncertainty for long-term effectiveness* More flexibility for future use Less reliance on institutional controls Less time to achieve goals than Monitored Natural Recovery Allows for treatment/beneficial use of sediments Limitations More logistically complex and costly Treatment technologies still in scale-up mode; may be costly Disposal facilities / options may be limited Difficulty in estimating residual contamination Effects of resuspension and/or volatilization Temporary disruption of aquatic community and habitat * Where cleanup levels achieved
12 Some Dredging Resuspension Terminology (General Illustration)
13 Minimizing Sediment Resuspension Equipment Selection Operator Experience Best Management Practices (BMPs) Containment (Curtains, Barriers, Sheetpile) Innovative Approaches
14 Horizontal Profiler Dredging Equipment Selection CableArm Horizontal Auger (MudCat) Cutterhead Source: Bean Environmental, Cable Arm
15 Some Best Management Practices for Resuspension Monitoring Bucket Closure Sensors Lift Speed Control Equilibration Time Rinse Tank / Clean Bucket Minimize Equipment Moves Penetration Depth
16 Emerging Technologies for Resuspension Control Control Zone Insitu Stabilization
17 RESUSPENSION Resuspension Trends FRACTION OF MASS REMOVED MASS RATE NORMAL OPERATING RANGE DREDGE PRODUCTION
18 Navigation Sources of Resuspension Photo provided by PANYNJ.
19 DREDGING RESIDUALS Sampling of Residuals Dredge Pre-dredging Elevation Of River Bottom Design Cut Line Contaminated Sediments Residual Sediments Overdredge Depth Clean Over-cut Sediments
20 Residuals Tidbits Prediction: The concentration of contaminants in dredging residuals is an integration of the concentration of the last bucket dredged. Reynolds Metals Case Study: After each dredging pass, approximately half of the dredge certification units (cells) met the cleanup criteria. One cell was dredged 13 times. Operator skill appears to be one of the keys to reducing residuals. Backfill can be effective used to attenuate residuals.
21 Managing Dredging Residuals Good Inventory Characterization & Dredge to Defined Elevation with backfill Redredging Specialty Equipment Backfilling (Dilution) Capping
22 Dredged Material Management Disposal CAD Cells CDFs Placement Sites (Brownfields) Decontamination Waste Management Facilities (Landfills) Handling Delivery: Barge vs. Hydraulic Dewatering vs. Desiccation Water Treatment Transport: Barge vs. Rail vs. Truck
23 Dredged Material Management Options
24 Decontamination Technologies Minergy Biogenesis Endesco / GTI (now Volcano) Upcycle Source:
25 Bean Environmental Bonacavor Hydraulic Excavator Dredge
26 Putting it All Together Dredging Scow Transport Hydraulic Offloading Courtesy of John Henningson; Henningson Environmental Services, Inc. Dewatering Stockpile for Treatment / Disposal Off-site Disposal or Beneficial Use Water Treatment Plant
27 CAPPING
28 Capping Feasibility & Design Considerations & Terminology Cap Stability - Erosion Cap Structure Navigation Porewater Fluxes Flooding Impacts Thickness Grain Size Filter Design Maintenance Borrow Source Identification Reactive Layers Physical Barriers Performance criteria Pre-dredging Habitat Layers
29
30 Capping Advantages/Limitations (per USEPA Guidance) Advantages Quickly reduce exposures Clean substrate for benthic re-colonization May enhance habitat Less infrastructure for material handling Less potential for resuspension Avoids risks associated with material treatment or disposal Usually lower cost and less disruption than dredging and sediment treatment/disposal Limitations Contaminated sediment remains could be released if disturbed or break through Possibility of sediment disruption during placement Shallow water may require inconvenient institutional controls (e.g., boating restrictions) Cap may alter hydrologic regime Cap materials may alter biological community Long-term monitoring and maintenance
31 Placement Techniques Conveyor Hydraulic Diffuser Split-Hull Barge Clamshell
32 Cap Placement Equipment - Spreader Source: Bean Environmental
33 Examples of Completed Capping Projects (Year Completed) St. Paul Waterway, WA (1991)* Marathon Battery, NY (1994) Eagle Harbor, WA (2002) Grasse River, NY (2005) pilot study Anacostia River, MD (2007) pilot studies Fox River, WI (ongoing) *part of the Commencement Bay - Nearshore Tideflats Superfund Site which consists of 8 contaminated sediment problem areas within 6 marine waterways.
34 Implementation / Construction Issues Processing Facility Siting Contractor Selection Operator Experience Management / Oversight Community Involvement Change Management
35 QUESTIONS?
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