Tennessee Valley Authority · NYSE:TVC
Tennessee Valley Authority — Technical Presentation (October 2010)
36 slides from Tennessee Valley Authority's technical presentation, Oct 20, 2010
Slide 1: Coal Combustion Facility Assessment Report
Coal Combustion Facility Assessment Report October 20, 2010
Slide 2: Introduction
Introduction Stantec Consulting g Services Inc. — North American Consulting Firm — 10,000 Engineers, Geologists, Architects, Scientists and Technicians — 140 Geotechnical Engineers — Clients include: • USACE • FEMA • Power Generating Industry John S. Montgomery, PE — Senior Principal — Licensed
Slide 3: Presentation Outline
Presentation Outline Program g Overview Phase 1 – Facility Review Phase 2 – Engineering Assessment Phase 3 – Remediation Design and Construction Phase Ph 4 – Programmatic P ti IImprovements t 2
Slide 4: Program Goals and Statistics
Presentation Outline Program g Goals — Assess Structural Conditions of Impoundments — Implement Improvements Program Statistics — FY10 Man-hours ~ 472,324 — FY 09 Engineering g g Man-hours ~ 168,074 , — Borings ~781 (47,000 ft of footage drilled) — Instruments ~ 594 — Rock Placed ~ 455,305 , ton
Slide 5: Program Overview
Program Overview Phase 1 – Facility y Review COMPLETE — Records Review/Staff Interviews — Site Condition Review — Recommendations for Future Analysis, Studies, and Program Improvements — Final Report Issued June 24, 2009 Phase 2 – Engineering Assessments COMPLETE — Geotechnical Explorations — Hy
Slide 6: Program Overview
Program Overview Phase 3 – Remediation Design g and Construction — Structural Deficiencies — Improve Freeboard (Storage) — Risk Reduction Phase 4 – Programmatic Improvements COMPLETE — Dam Safety Inspection Training — Programmatic Documents 5
Slide 7: Phase 2 Engineering Assessments: General Findings
Phase 2 Engineering Assessments General Findings g Seepage p g Steep Slopes Slope Stability Occasional Surface Slumps Operational O ti l and d St Storm F Freeboard b d (St (Storage)) Poor Surface Drainage / Standing Water All Issues Are Being Addressed Geotechnical Drilling at Cumberla
Slide 8: Phase 2 Engineering Assessments: Geotechnical Explorations
Phase 2 Engineering Assessments Geotechnical Explorations p Geotechnical Exploration p Statistics — 781 Borings FS=1.4 — 47,000 Linear Feet of Drilling — 20,000 Samples Retrieved — 17,000 Tests Performed Ash — 594 Instruments Installed Slope Stability Findings — All Facilities > 1.0 FS – Factor
Slide 9: Geotechnical Explorations: Comparison to Kingston
Phase 2 Engineering Assessments Geotechnical Explorations p Comparison p to Kingston g Root Cause Analysis y — Increased Loads Due to Higher Fill — Fill Geometry and Setbacks — Unusual Weak Silt/Ash Slime Foundation — Hydraulically Placed Loose Wet Ash This Combination of Conditions Was Not Obse
Slide 10: Dam Safety Hazard Classification
Phase 2 Engineering Assessments Dam Safetyy Hazard Classification Low Hazard Potential – — No Probable Loss of Human Life — Low Economic/Environmental Losses — Losses Principally Limited to Owners Property Property. Significant Hazard Potential – — No Probable Loss of Human Life — Can Cause: • E
Slide 11: Dam Safety Hazard Classification - Initial
Phase 2 Engineering Assessments Dam Safetyy Hazard Classification - Initial Initial Hazard TVA Fossil Plants Facility Classification Allen Ash Disposal Ash Pond Bull Run Gypsum Dry Stack N/A Colbert Bottom Ash Ash Pond Cumberland Gypsum Gallatin Ash Disposal Dry Stack N/A John Sevier Bottom Ash John
Slide 12: Dam Safety Hazard Classification - Current
Phase 2 Engineering Assessments Dam Safetyy Hazard Classification – Current Current Hazard TVA Fossil Plants Facility Classification Allen Ash Disposal Ash Pond Bull Run Gypsum Dry Stack N/A Colbert Bottom Ash Ash Pond Cumberland Gypsum Gallatin Ash Disposal Dry Stack N/A John Sevier Bottom Ash John
Slide 13: Spillway Inventory
Phase 2 Engineering Assessments Spillway p y Inventory y Spillway – Pipe That Discharges Permitted Flows From an Impoundment Tall Unsupported Risers Outlet Pipes Spillway Replacement — Johnsonville Riser — Colbert — Sh Shawnee — Widows Creek Outlet Pipe Dam — Cumberland Shawnee Spillway Repl
Slide 14: Phase 3 Remediation Status
Phase 3 Remediation Design and Construction Status 76 Capital Projects Currently in Planning, Design, Construction or C Completed l d PhPhase TVA Fossil Implementation/ Planning Design Plant Complete Allen - 1 1 Bull Run 5 2 4 Colbert Co be 2 1 4 Cumberland 3 2 1 Gallatin 1 - 1 J h S John Sevier i
Slide 15: Phase 3 Remediation Status
Phase 3 Remediation Design and Construction Status Calendar Year 2009 2010 2011 East Ash Pond Allen East Stilling Pond Main Ash Pond Area 2 Bull Run Bottom Ash Disposal Area 1 Gypsum Disposal Area 2A Disposal Area 5 Colbert Ash Pond 4 Dry Ash Stack Cumberland Ash Pond Gypsum Storage Area Fly Ash Pon
Slide 16: Johnsonville Ash Pond
Phase 3 Remediation Design and Construction Johnsonville Ash Pond ACTION: Spillway Closure ACTION: Spillway Replacement Kentucky Lake ACTION: Lower Pool 2.6 Feet ACTION: Spillway Closure ACTION: Rock Buttress / Seepage Blanket ACTION: Rock and Clay Buttress / Seepage Blanket Improvement Actions
Slide 17: Johnsonville Ash Pond
Phase 3 Remediation Design and Construction Johnsonville Ash Pond South Spillway Inlets - Before South Spillway Inlets - After 16
Slide 18: Johnsonville Ash Pond
Phase 3 Remediation Design and Construction Johnsonville Ash Pond South Spillway Outlets - Before South Spillway Outlets - After 17
Slide 19: Johnsonville Ash Pond
Phase 3 Remediation Design and Construction Johnsonville Ash Pond North East Dike - Before N th E North Eastt Dik Dike - After Aft 18
Slide 20: Johnsonville Ash Pond
Phase 3 Remediation Design and Construction Johnsonville Ash Pond North East Dike - Before N th E North Eastt Dik Dike - After Aft 19
Slide 21: Paradise Scrubber Sludge Complex
Phase 3 Remediation Design and Construction Paradise Scrubber Sludge g Complex p ACTION: Drainage Improvements ACTION: Trees Removed and Vegetation Cut to Facilitate Frequent Slope Inspections. ACTION: Fill and Regrade Pond East Pond ACTION: Relocate Operating Pool Spring, 2011 Scrubber Sludge Compl
Slide 22: Paradise Scrubber Sludge Complex
Phase 3 Remediation Design and Construction Paradise Scrubber Sludge g Complex p East Pond South Slope Buttress - Before East Pond South Slope Buttress - After 21
Slide 23: Paradise Scrubber Sludge Complex
Phase 3 Remediation Design and Construction Paradise Scrubber Sludge g Complex p East Pond East Slope Armoring - Before East Pond East Slope Armoring - After 22
Slide 24: Bull Run Ash Pond and Gypsum Stack
Phase 3 Remediation Design and Construction Bull Run Ash Pond and Gypsum yp Stack ACTION: Ditch Grading ACTION: East, ACTION E t West W t and d North Slope Grading East and West Dredge Cells ACTION: French Drain Bottom Ash Disposal Area 1 ACTION: Lower Pool in Gypsum Ash pond to Elev. 801’ Disposal
Slide 25: Bull Run Gypsum Stack
Phase 3 Remediation Design and Construction Bull Run Gypsum yp Stack Gypsum Stack Buttress - After Gypsum Stack Buttress - Before 24
Slide 26: Bull Run Gypsum Stack
Phase 3 Remediation Design and Construction Bull Run Gypsum yp Stack Gypsum Stack Buttress – After Pool Lowering Ash Pond Pool – Before Pool Lowering 25
Slide 27: Bull Run Gypsum Stack
Phase 3 Remediation Design and Construction Bull Run Gypsum yp Stack Slope and Drainage Improvements Slope and Drainage Improvements 26
Slide 28: Widows Creek Gypsum Stack and Ash Pond
Phase 3 Remediation Design and Construction Widows Creek Gypsum yp Stack and Ash Pond ACTION: Rock Toe Buttress Around ACTION: Surface Water Drainage System Perimeter of Main Ash Pond with Seepage Control around Gypsum ACTION: Main Ash Pond Dredging ACTION: Grouted Abandoned and Spillway Replacement
Slide 29: Widows Creek Gypsum Stack
Phase 3 Remediation Design and Construction Widows Creek Gypsum yp Stack Gypsum Stack West Slope Buttress - Before Gypsum Stack West Slope Buttress - After
Slide 30: Widows Creek Gypsum Stack
Phase 3 Remediation Design and Construction Widows Creek Gypsum yp Stack Gypsum Stack Seepage Drain and Armoring Gypsum Stack Seepage Drain and Armoring 29
Slide 31: Cumberland Ash Pond and Gypsum Stack
Phase 3 Remediation Design and Construction Cumberland Ash Pond and Gypsum yp Stack ACTION: Lower Ash Pond Pool Cumberland River ACTION: Spillway Modifications Ash Pond ACTION: Permanent Pool Eliminated from Gypsum Stack, March 2009 Dry Ash Stack ACTION: Regrade Slopes and Perimeter Ditch, Buttressi
Slide 32: John Sevier Ash Complex
Phase 3 Remediation Design and Construction John Sevier Ash Complex p ACTION: Construct Toe Drain at Lower Perimeter Road ACTION: Grout Abandoned ACTION: Regrade / Spillway Pipes Flatten Slope ACTION: Regrade Slope between Upper and Lower Perimeter Roads Dry Ash Stack ACTION: Placement of Riprap Sed
Slide 33: Phase 4 Programmatic Improvements: Dam Safety Inspection Training
Phase 4 Programmatic Improvements Dam Safetyy Inspection p Training g Training g Sessions at Each Fossil Plant Two Sessions in Chattanooga Over 300 Staff Received Training Training Elements Included: — Roles and Responsibilities Dam Safety Training — Failure Modes Coal Combustion Product — C
Slide 34: Phase 4 Programmatic Improvements: Programmatic Documents
Phase 4 Programmatic Improvements Programmatic g Documents Volume 1 – Program g Management g and Responsibilities Volume 2 – Facilities Design g and Construction Requirements Volume 3 – Operation, Maintenance, and Inspection 33
Slide 35: Thank You
Coal Combustion Facility Assessment Report Thank You
Slide 36: Phase 3 Remediation Status: Material Totals FY10
Phase 3 Remediation Design and Construction Status • Material Totals For FY10 (excluding KIF) – Man-hours ~ 472,324 – Rock Placed ~ 455,305 , tons – Sand ~ 26,277 tons Instrumentation at Gallatin Paradise Scrubber Complex Armoring 35
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