Tennessee Valley Authority · NYSE:TVC
Tennessee Valley Authority — Investor Presentation (November 2012)
17 slides from Tennessee Valley Authority's investor presentation, November 2012
Slide 1: TVA Kingston Ash Recovery Project: River System Action Memorandum
TVA Kingston Ash Recovery Project Roane County, TN River System Action Memorandum November 2012
Slide 2: Overview
Overview • Project accomplishments (Phases 1 & 2) • Phase 3 – What is it? • Ecological risk assessment • Human health risk assessment • River System EE/CA alternatives • Selected alternative
Slide 3: CERCLA Removal Action Strategy
CERCLA Removal Action Strategy • Phase 1: Time‐Critical (complete) – 3.5 million CY removed – 4 million tons disposed at Perry County, AL – Emory River reopened May 29, 2010 • Phase 2: Non‐Time Critical (current) – 2.8 million CY (north and middle embayment) – Consolidating in reinforced, on‐site di
Slide 4: Phase 2 Operations
Phase 2 Operations • Ash Excavation – North Embayment • Completed end of 2011 • 1,010,000 CY removed – Middle Embayment • 73% complete; 938,000 CY removed – Relic • 421,000 CYs relocated • Ash Stacking – Central Dredge Cell: 1,259,000 CY – Lateral Expansion: 582,000 CY – Ash Pond: 394,000 CY – Compl
Slide 5: 3 ¾ Years of Recovery
3 ¾ Years of Recovery December 23, 2008 September 27, 2012
Slide 6: Phase 3 - River System Sampling & Analysis Plan (SAP)
Phase 3 ‐ River System Sampling & Analysis Plan (SAP)
Slide 7: Phase 3 River System Sampling & Analysis Plan
Phase 3 River System Sampling & Analysis Plan • Framework for ecological and human health investigations • Multiple measurement endpoints to evaluate effects • More than: – 16,000 samples – 400,000 analyses • $40 million invested • Site‐wide Quality Assurance Project Plan • Many State & Federal Agen
Slide 8: SAP Studies
SAP Studies • Water – Groundwater – Surface water – Water within sediment (pore water) • Ash nature & extent – How much? – Where is it? • Sediment – Mixing with ash? – Toxicity • Living organisms – Bioaccumulation – Fish and benthic community surveys
Slide 9: SAP: Ash Nature & Extent
SAP: Ash Nature & Extent ● Approximately 510,000 CY of residual ash in river system – 82 % in Emory Reaches A & B (ERM 0—3.5) – 3 % in Emory Reach C (ERM 3.5—6) – 14% in Clinch Reach B (CRM 3‐4.5) Emory River Reach A & B: – 1% in Clinch Reach A (CRM 0—3) ERM 0.0‐3.5 ● Maximum ash depth is 4‐6 ft Cli
Slide 10: Ecological Risk Assessment Summary
Ecological Risk Assessment Summary • Risk indicators: – Arsenic – Selenium • Findings: – Low risk to organisms that: • Live in sediment • Eat organisms that live in sediment ‐ Benthic Invertebrate (bugs) Mayfly Nymph ‐ Tree Swallow ‐ Killdeer Killdeer
Slide 11: Human Health Risk Assessment
Human Health Risk Assessment • Examined multiple exposure scenarios • Used real, site‐specific data • Followed EPA risk assessment guidance • Results: – Confirmed risks from legacy PCBs & Mercury in fish tissues • TDEC fish consumption advisory pre‐dating the spill – No unacceptable risks associated
Slide 12: Removal Action Objectives
Removal Action Objectives • Protect invertebrate populations in Watts Bar Reservoir – Arsenic and selenium in ash‐contaminated sediment • Protect shoreline‐feeding and aerial‐feeding bird populations – Uptake of arsenic and selenium through diet (benthic invertebrates) • Restore ecological function
Slide 13: EE/CA Alternatives Evaluated
EE/CA Alternatives Evaluated Alternative 1: Monitored Natural Recovery – Natural mixing of ash with sediment – Long‐term monitoring program with 5 Year Reviews – Net Present Value = $10 million Alternative 2: Capping – Alternative 2A • Cap 200 acres of ash deposits >0.5’ thick • Net Present Value =
Slide 14: EE/CA Public Comments
EE/CA Public Comments • 5 sets of comments received – Roane County Environmental Review Board – Roane County Community Advisory Group – 3 individuals • Preferred EE/CA alternative: – 3 supported EE/CA Alternative 1 – Monitored Natural Recovery – 2 did not indicate a preference • EE/CA Responsiveness
Slide 15: Alternative 1: Monitored Natural Recovery
Alternative 1 Monitored Natural Recovery • Relies on natural processes – Mixing and burial of ash with native sediments – Decreased % of ash = lower concentrations of arsenic and selenium • Sediment Fate & Transport Modeling – System is net depositional (30 yr average = ½ inch year) – Emory River Re
Slide 16: Community Involvement
Community Involvement • Public comment period – November 9 through December 8 – Public Meeting – Court Reporter – Email: [email protected] – Mail: TVA P.O. Box 40 Kingston, Tennessee 37763‐0040 Attn: Kingston Public Comments – Action Memorandum available for review: • www.tva.gov/kingston • www.e
Slide 17: Questions?
QUESTIONS? • www.epakingstontva.com • [email protected]
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