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Tennessee Valley Authority — Technical Presentation (November 2010)
17 slides from Tennessee Valley Authority's technical presentation, Nov 8, 2010
Slide 1: Environmental Assessment and Management Programs for the TVA Kingston Ash Recovery Project
Environmental Assessment and Management Programs for the TVA Kingston Ash Recovery Project Daniel Jones† David Ludwig† Neil Carriker ‡ Dennis Yankee‡ †ARCADIS U.S., Inc.; ‡Tennessee Valley Authority Imagine the result Imagine the result
Slide 2: Overview
Overview • Platform & Poster Sessions: – Regulatory Framework – Assessment Efforts • Why? – Environmental Management • This Presentation: – Risk Assessment – Restoration – Stewardship – Decision-Making 2 of 22 22 November 2010 © 2009 ARCADIS
Slide 3: Environmental Management
Environmental Management Comprised of three major processes Remediation Restoration Stewardship Goals Protection of Replacement of Services Maintenance • Human Health Environmental • Human Use • Environment Services Lost • Ecological Assessments • HHRA NRDA Monitoring • ERA • Human Use • Ecological
Slide 4: Risk Assessment
Risk Assessment • Iterative Process • Historic Releases – “Stable” conditions Collect Analysis – Start simple Information – Identify uncertainties – Add lines of evidence Risk • Current Releases SMDP Characterization – Dynamic conditions – Start comprehensive – Document trends No Further Action – Fo
Slide 5: Phased Removal Strategy
Phased Removal Strategy Non-Time Critical Time Critical 5 of 22 22 November 2010 © 2009 ARCADIS
Slide 6: Cleanup: Phase 1
Cleanup: Phase 1 • Emory River Channel – Blocked by ash – Risks evident and Analysis immediate Collect o Flooding Information o Migration Risk • Time Critical Removal Characterization Action SMDP Start Dredging, Stop Dredging 6 of 22 22 November 2010 © 2009 ARCADIS
Slide 7: Cleanup: Phase 2
Cleanup: Phase 2 • Dredge Cell, Embayment – Stabilized by Dike #2 Analysis Collect • Non-Time Critical Information Removal Action Risk • EE/CA Done Characterization • Screening – Viable alternatives: SMDP o All ash removed from embayment o Waters restored Excavate Ash, o Wetlands restored Restore Em
Slide 8: Cleanup: Phase 3
Cleanup: Phase 3 • River System – Emory River (post-dredging) – Clinch River Analysis – Tennessee River Collect • Non-Time Critical Information Removal Action Risk • EE/CA planning Characterization – Residual ash, larger area • Screening SMDP – Risks are uncertain • Baseline – Cleanup is challenging
Slide 9: River System ERA
River System ERA 9 of 22 22 November 2010 © 2009 ARCADIS
Slide 10: River System: Ecological Receptors
River System: Ecological Receptors • Aquatic plants • Pelagic fish • Benthic fish • Benthic invertebrates • Aquatic- or riparian-feeding birds – Herbivores (wood duck) – Omnivores (mallard; killdeer) – Piscivores (osprey; great blue heron) • Aquatic- or riparian-feeding mammals – Herbivores (muskrat
Slide 11: Lines-of-Evidence
Lines-of-Evidence • Exposure Concentrations vs. Literature-Derived Effects Values Weight-of-Evidence – Abiotic media – Biota – Diet • Bioassays – Sediment/Ash – Surface water • Biosurveys – Fish, Benthics – Birds, Mammals – Herps, Plants 11 of 22 22 November 2010 © 2009 ARCADIS
Slide 12: Restoration Status
Restoration Status • West Embayment – Completed • Swan Pond Embayment – Ecological Restoration Design – Conceptual, in Phase 2 EE/CA • East Embayment – Ash Removal Completed 2010 – Restoration Design 2011 – Consistent with Swan Pond • River System – To Be Determined 12 of 22 22 November 2010 © 2009
Slide 13: Environmental Management: Restoration
Environmental Management: Restoration Natural Resource Damages Assessment 1. Injuries are “measurable adverse changes” in natural resources or resource services. [15 CFR 990 Subpart E.II.B.1; 43 CFR 11.14(w)] 2. Baseline is “…the condition of natural resources and services that would have existed ha
Slide 14: Environmental Management: Stewardship
Environmental Management: Stewardship • Fly ash release was huge - however: – Not all resources were damaged – Not all services were impaired • TVA continues to: – Monitor resources – Manage services o Human use o Ecological 14 of 22 22 November 2010 © 2009 ARCADIS
Slide 15: Environmental Management
Environmental Management • Ultimately about making decisions – Assessments must support the decision-making process • Zero-Sum Enterprise – Resources are finite – Time, money, effort and expertise spent on one question or action are not available for other environmental activities – Investments must
Slide 16: Concurrent Poster Session
Concurrent Poster Session Monday November 8, 2010 (TODAY!) • Integrated Ecotoxicological Research Programs • Ash Characterization and Migration • Surface Water Quality Monitoring • Survival/Growth of Hyalella azteca • Bioaccumulation of Selenium and Trace Elements • Fish and Benthic Invertebrate Stu
Slide 17: SECTION BREAK
SECTION BREAK a ARCADIS
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