Tennessee Valley Authority · NYSE:TVC

Tennessee Valley Authority — Technical Presentation (May 2012)

23 slides from Tennessee Valley Authority's technical presentation, May 3, 2012

1. Slide 1: River Systems Investigations Update

   River Systems Investigations Update TVA Kingston Ash Recovery Project Presentation 4 of 6 May 3, 2012 TVA Restricted Information - Deliberative and Pre-Decisional Privileged

2. Slide 2: Agenda

   Agenda •• Purpose •• Overviewofpresentationseries •• UpdateonWildliferesults ¾ Aquaticplants ¾ Amphibians ¾ Reptiles ¾ Birds ¾ Mammals TVA Restricted Information - Deliberative and Pre-Decisional Privileged

3. Slide 3: Purposes of Briefings

   PurposesofBriefings •• Processleadingtoresidualashdecision •• Informationthatwillsupportdecision •• Previewresultsofriverinvestigations TVA Restricted Information - Deliberative and Pre-Decisional Privileged

4. Slide 4: Preview of Upcoming Attractions

   Previewof““UpcomingAttractions”” Tonight’’sfocus: WildlifeResults April5: Residualashnature&extent,transportmodeling April19: AquaticsResults (toxicitytesting,bioaccumulationininvertebrates& fishes) May3: WildlifeResults (birds,turtles,mammals,plants) May17: HumanHealthRiskAssessment EcologicalRiskA

5. Slide 5: Wildlife Collections

   WildlifeCollections Purposes: •• DetermineifashͲrelatedmetalsarebioavailabletowildlife. •• DetermineifwildlifearematernallytransferringashͲrelated metalstoyoung. •• Determineifbioaccumulationandmaternaltransferresultin adverseeffectstowildlifepopulations. TVA Restricted Information - Deliberative an

6. Slide 6: Conceptual Exposure Model

   ConceptualExposureModel TVA Restricted Information - Deliberative and Pre-Decisional Privileged 6

7. Slide 7: Wildlife Collection Overview

   WildlifeCollectionOverview AquaticVegetation MetalsAnalyzedinAllTissue: •• Periphyton(i.e.,algae,diatoms) Aluminum Lead •• Shorelineandemergentvegetation Antimony Magnesium Arsenic Manganese Amphibians Barium Mercury •• Frogandtoadwholebodytissue Beryllium Molybdenum Boron Nickel Reptiles Calcium So

8. Slide 8: Wildlife Collection Overview

   WildlifeCollectionOverview TVA Restricted Information - Deliberative and Pre-Decisional Privileged

9. Slide 9: Aquatic Vegetation – Periphyton

   AquaticVegetation–– Periphyton •• Locations: Reference(upstreamEmoryandClinch),EmoryRiverreaches, ClinchRiverreaches •• Collections: –– 3samplersperlocation–– onecompositesampleperreach –– Samplersleftoutfor3weeks •• Results:Nodifferencesinlocations(2011) SeleniumConcentration(mg/kgdryweight) TVA Re

10. Slide 10: Aquatic Vegetation – Grasses and Sedges

    AquaticVegetation–– GrassesandSedges •• Locations:Reference(upstreamEmory,Clinch,andTNRivers),EmoryRiver reaches,ClinchRiverreaches,andTNRiverreaches •• Collections: –– Shorelineandemergentvegetation –– 3samplesofeachtypeperreach –– Cutvegetationaboveground(didnotincluderoots) •• Results:Nodifferenc

11. Slide 11: Amphibians – Frogs and Toads

    Amphibians–– FrogsandToads •• Locations: Reference(3unimpacted areas),North Embayment,WestEmbayment •• Collections: –– Uplandchorusfrog,Springpeeper,andAmericantoad –– 10ofeachspeciescollectedpersite •• Results:Somedifferencesinlocationsoryears(2009/2010), Photo credit: Dr. J.D. Wilson adverseeffect

12. Slide 12: Reptiles – Turtle Blood

    Reptiles–– TurtleBlood •• Locations:Reference(upstreamTNRiver),EmoryRiver, ClinchRiver,TNRiver(downstream) •• Collections: –– Commonmusk/mudturtle,snappingturtle,Easternspinysoftshellturtle –– 20ofeachspeciescollectedperriver •• Results:Somedifferencesinlocations(2010), adverseeffectslevelsnotestabl

13. Slide 13: Birds – Great Blue Heron Eggs

    Birds–– GreatBlueHeronEggs •• Locations:Reference(upstreamTNRiver),EmoryRiver(ERM3.0) •• Collections: –– 1eggcollectedpernest,10eggspersite –– Eggmetricsrecorded •• Results:Somedifferencesinlocationsandyears, allconcentrationsbelowconservativeeffectslevel SeleniumConcentration(mg/kgdryweight) Conser

14. Slide 14: Birds – Osprey Eggs

    Birds–– OspreyEggs •• Locations: Reference(upstreamTNRiver),EmoryRiver, ClinchRiver,TNRiver(downstream) •• Collections: –– 1eggcollectedpernest,10eggspersite –– Eggmetricsrecorded •• Results:Nodifferencesinlocationsoryears, allconcentrationsbelowconservativeeffectslevel Conservativeadverseeffectleve

15. Slide 15: Birds – Canada Geese Eggs

    Birds–– CanadaGeeseEggs •• Locations: Reference(upstreamTNRiver),EmoryRiver, ClinchRiver •• Collections: –– 1eggcollectedpernest,10eggspersite –– Eggmetricsrecorded •• Results: Somedifferencesinlocations,allmean concentrationsbelowconservativeeffectslevel SeleniumConcentration(mg/kgdryweight) Conser

16. Slide 16: Birds – Tree Swallow Eggs

    Birds–– TreeSwallowEggs •• Locations:Reference(FortLoudounDam,TellicoDam, upstreamTNRiver),EmoryRiver,ClinchRiver,TNRiver •• Collections: –– 1eggcollectedpernest,10to15eggspersite –– Eggmetricsrecorded •• Results:Somedifferencesinlocationsandyears,allmean concentrationsbelowconservativeeffectslevel

17. Slide 17: Birds – Tree Swallow Nestlings

    Birds–– TreeSwallowNestlings •• Locations: Reference(FortLoudounDam),ERM3.5,ERM3.0, CRM2.5,MeltonHillDam •• Collections: –– 1nestlingcollectedpernest,10to15nestlingspersite –– Weightandlengthmeasurements •• Results:Somedifferencesinlocationsandyears, adverseeffectslevelsnotestablishedfornestlings Se

18. Slide 18: Birds – Tree Swallow Reproduction

    Birds–– TreeSwallowReproduction •• Locations: Reference(FortLoudounDam),ERM3.5,ERM3.0,CRM2.5, MeltonHillDam •• Measurements: –– Clutchsize,Hatchingsuccess,Nestlingsurvival •• Results:Somedifferencesinhatchingsuccess(2010) NumberofEggsperNest Percent(%) TVA Restricted Information - Deliberative and P

19. Slide 19: Mammals – Raccoons

    Mammals–– Raccoons (MarcySouzaatUniversityofTennessee) •• Locations: Reference(MeltonHillDam,residencesin KnoxCounty),IntakeChannel,Embayments(East,West, andNorth) •• Collections: –– Tissues:Blood,brain,gonad,kidney,liver,ovary,skeletalmuscle, andsubcutaneousfat –– Other:Bloodcounts,plasmabiochemist

20. Slide 20: What's Next on the Sampling Front?

    What’’sNextontheSamplingFront? 2011 Nicholas Morris TVA Restricted Information - Deliberative and Pre-Decisional Privileged 20

21. Slide 21: What's Next on the Sampling Front? Eggs

    What’’sNextontheSamplingFront? VirginiaTech2011Ͳ2013 Eggs TVA Restricted Information - Deliberative and Pre-Decisional Privileged 21

22. Slide 22: Summary

    Summary •• Istheregoodevidencethatseleniumisbioavailabletowildlife? –– Yes:Amphibians,heron,geese,andtreeswallows. –– No:Periphyton,aquaticvegetation,turtles,osprey,orraccoons. •• Istheregoodevidencethatwildlifearematernallytransferring metalstotheiryoung? –– Yes:Heron,geese,treeswallows –– No:Ospre

23. Slide 23: Preview of Upcoming Attractions

    Previewof““UpcomingAttractions”” May17: HumanHealthRiskAssessmentProcess EcologicalRiskAssessmentProcess DevelopmentofGeneralResponseActions June7: AlternativesEvaluation TVA Restricted Information - Deliberative and Pre-Decisional Privileged

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