Tennessee Valley Authority · NYSE:TVC
Tennessee Valley Authority — Technical Presentation (August 2011)
26 slides from Tennessee Valley Authority's technical presentation, Aug 2, 2011
Slide 1: TVA Kingston Ash Recovery Project, Roane County, TN
TVA Kingston Ash Recovery Project Roane County, TN Environmental Research Symposium Roane State Community College – August 2, 2011 Craig Zeller, P.E. US EPA Region 4 – Superfund Division
Slide 2: CERCLA Removal Action Strategy
CERCLA Removal Action Strategy • Phase 1 (Time-Critical Action Removal) – 3.5 million cys removed (excavated and dredged) – 4.0 million tons disposed at Perry County, AL (completed 12/01/10) – May 29, 2010 Emory River reopened • Phase 2 (Non-Time Critical Action Removal) – 2.8 million cys to be remo
Slide 3: 2 ½ Years of Recovery
2 ½ Years of Recovery • Then &22 December 23, 2008 June 06, 2011
Slide 4: Phase 2 Work Description
Phase 2 Work Description • Excavate Ash (Armada of Yellow Iron) – Pan Scrapers – Excavators/dump trucks • Short-Term Storage – Dry to Optimum MC (17 to 23%) – West Storage Discing/Lime 6% • Long-Term Storage in Dredge Cell – Placed in 1 foot lifts – Compacted to 90% proctor – In-situ density/Piezos/
Slide 5: Why Moisture Content Matters
Why Moisture Content Matters
Slide 6: Phase 2 Construction Schedule
Phase 2 Construction Schedule 6
Slide 7: Phase 2 Work Areas
Phase 2 Work Areas 2)
Slide 8: Ash Excavation
Ash Excavation Cubic Yards of Ash 1,400,000 1,200,000 1,000,000 800,000 600,000 400,000 200,000 Ash Excavation from North Embayment - Weekly as of July 31st = eTarget Cumulative - Loose CY Actuals Cumulative - Loose CY
Slide 9: Ash Excavation North Embayment
Ash Excavation North Embayment
Slide 10: Ash Stacking in Dredge Cell
Ash Stacking in Dredge Cell - Weekly as of July 31st 1,300,000 1,100,000 900,000 Cubic Yards of Ash 700,000 500,000 300,000 n s av \ C) S x =< eTarget Cumulative - Loose CY Actuals Cumulative -Loose CY
Slide 11: Ash Stacking (Lateral Expansion)
Ash Stacking (Lateral Expansion)
Slide 12: Perimeter Containment System
Perimeter Containment System • Design based on 3-D Seismic Model (FLAC) – 6.0 earthquake on East TN fault – 7.6 earthquake on New Madrid fault • ≈11,500 linear feet (around perimeter of cell) • 50-70 feet BGS • Keyed 3 feet into shale bedrock • Target UCS ranges 200 to 280 psi (average) • Pilot Demo
Slide 13: Perimeter Containment Design
Perimeter Containment Design
Slide 14: Perimeter Containment Layout
Perimeter Containment Layout
Slide 15: Full Scale Production Equipment
Full Scale Production Equipment
Slide 16: Air Monitoring
Air Monitoring • Real-time air monitors – 5 stations – PM 2.5 & 10 • EPA (SESD) Ambient Air Monitoring Audits – Quarterly (thru 2010) – Semi annual – No significant
Slide 17: Air Monitoring
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Slide 18: Air Monitoring
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Slide 19: Surface Water Monitoring
Surface Water Monitoring • Weekly Grabs at Stilling Pond, Pond Discharge to Clean Water Ditch, & Embayment • ISCO at Embayment set to 0.50” rainfall • 5 ISCOs on Emory/Clinch discontinued
Slide 20: Surface Water Results
ARSENIC Stilling Pond (35/35 detects) TDWS-0.010 ppm 0 ew 8/31/10 1/22/11 6/15/11 Embayment (115/115 detects) 0.2 AS ppm 0.1 4 t a tefl it ain oak 1 Ms Tt agis ” $6 apfts-0.010 ppm ¢ 8/31/10 1/22/11 6/15/11 SELENIUM Stilling Pond (35/35 detects) FALS=0.005 ppm 0 Samat, © 0 Stns 0 | 0 © itera es ai 8
Slide 21: River ISCO Results for Arsenic
River ISCO Results for Arsenic
Slide 22: River ISCO Results for Selenium
River ISCO Results for Selenium
Slide 23: Phase 3 – River System SAP
_-— EMORY RIVER = REACH c: REFERENCE REACH: >ERM 6.0 EMORY RIVER REACH B: ern 1.523, EMORY RIVER REACH a: ERM 0,0-1,5 — PLANT UTTAR LcuincH RIVER REFERENCE REACH; -CRM 4,5 ug, May 050100 TENNESSEE RIVER REACH B: TRM 566,0-563,0—, . % << “™ cLincH REACH A CRM 0,0-3.0 STUDY BEACH LEGEND: -— TENNESSEE
Slide 24: River System Sampling & Analysis Plan
River System Sampling & Analysis Plan • SAP document approved June 2010 • Multiple measurement endpoints within CERCLA Eco Risk Framework • Nature & Extent of Sediment/Ash – Residual ash/submerged/seasonally exposed – 2 Dimensional Fate/Transport Modeling • Surface Water • Groundwater/Aquifer Testin
Slide 25: River System SAP Schedule
River System SAP Schedule • All data collection completed • Interim Technical Memoranda submitted – Surface Water, Groundwater, Birds, Amphibians, Tree Swallows, & Turtles • Tech Memos for Sediments/Ash, Fish and MODFLOW anticipated within next few weeks • Toxicity Reference Values (TRVs) forthcomin
Slide 26: Conclusions
Conclusions • Future land use plans for TVA acquired properties along Lakeshore Slough/Gupton Farm – Public meeting 8/02 at 5pm (First Baptist Church) • Thanks to TVA, ORAU, Roane State CC, and all participants • Enjoy the Symposium! • Questions? – [email protected] – www.epakingstontva.com
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