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TVA Aquatic and Sediment Toxicity Studies

Environment & Technology – Biological & Water Resources August 2011. TVA Aquatic and Sediment Toxicity Studies. Kingston Fly Ash Environmental Research Symposium August 2 - 3, 2011 Rick M. Sherrard, Ph.D. Tennessee Valley Authority.

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TVA Aquatic and Sediment Toxicity Studies

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  1. Environment & Technology – Biological & Water Resources August 2011 TVA Aquatic and SedimentToxicity Studies Kingston Fly Ash Environmental Research Symposium August 2 - 3, 2011 Rick M. Sherrard, Ph.D. Tennessee Valley Authority

  2. Environment & Technology – Biological & Water Resources August 2011 • Time-Critical Removal Action • Phase 1 – Characterize Toxicity • whole sediment • dredge plume • dredge dewatering • treated water discharge • Phase 2 – Intensive Dredge Monitoring • Phase 3 – Bioavailability Study • Non-Time-Critical Removal Action • BERA Support as defined in SAP Toxicity Study Overview

  3. Environment & Technology – Biological & Water Resources August 2011 • Screening (controls + undiluted sample) • Hyalella azteca • Lampsilis siliquoidea • Lampsilis cardium • Corbicula fluminea • Lumbriculus variegatus • Ceriodaphnia dubia • Pimephales promelas • Definitive (with aqueous dilutions) • Ceriodaphnia dubia • Pimephales promelas Phase 1 & 2 Laboratory Tests

  4. Environment & Technology – Biological & Water Resources August 2011 Phase 1 & 2 Results Hyalella azteca • 10-day Survival ≈ 70 – 80% • 10-day Growth & Biomass 70% of Controls

  5. Environment & Technology – Biological & Water Resources August 2011 Ash Phase 3 Bioavailability Study No Resin Add Resin Untreated Porewater Treated Porewater Resin 1 hr Resin 1 hr UPW PWR UA RTA RTAPWR RTAPW

  6. Environment & Technology – Biological & Water Resources August 2011 • Ash exposures with resin treatment • Survival effects unchanged • Growth effects eliminated • Sb, As, Se decreases in ash • Al, Sb, As, Mo, Se, V partition less to overlying water • Porewater exposures – no resin treatment • No effect on survival • Significant growth effects • Porewater exposures with resin treatment • No survival effects • No growth effects Phase 3 Bioavailability Results

  7. Environment & Technology – Biological & Water Resources August 2011 Study findings suggest: Phase 3 Bioavailability Conclusions • Survival effects due to physical properties • Growth effects due to metals/metalloids • No constituent present at toxic level • Metals bioavailability via porewater

  8. Environment & Technology – Biological & Water Resources August 2011 BERA Sediment Toxicity Studies Ceriodaphnia dubia Chironomus dilutus Hyalella azteca

  9. Environment & Technology – Biological & Water Resources August 2011 Sediment Toxicity Study Design

  10. Environment & Technology – Biological & Water Resources August 2011 • H. azteca (no survival effects) • CRM 1.5 (growth & biomass) • CRM 2.5 (growth) • CRM 3.0 (no effects) • CRM 4.5 (growth) • C. dilutus (no survival effects) • CRM 1.5 (no effects) • CRM 2.0 (biomass) • CRM 3.0 (no effects) • CRM 4.0 (growth & biomass) Clinch River Screening Results

  11. Environment & Technology – Biological & Water Resources August 2011 Clinch River H. azteca Results

  12. Environment & Technology – Biological & Water Resources August 2011 Clinch River C. dilutus Results

  13. Environment & Technology – Biological & Water Resources August 2011 Clinch River C. dilutus Results

  14. Environment & Technology – Biological & Water Resources August 2011 Clinch River C. dubia Results

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