DSAC I Classification- Karst foundation seepage

CenterCenter HillHill DamDam ProjectProject asas ofof 0505 NovNov 1313

Main Embankment & Left RimMain Embankment & Left Rim

DSAC I Classification- Karst foundation seepage $350M Cost, $213M Obligated, 45% CompleteProject Completion – 2017

Grouting - completeBarrier Wall – Widened Platform,

Guide wall, Slurry Plant

Saddle Dam EmbankmentSaddle Dam EmbankmentRCC Reinforcing Berm

Left Rim & Main Embankment Grouting - $87MGrouting $87MCompleted Dec 2010Contractor: Kiewit & ACT, JV

Barrier Wall - $121MAwarded Sep 2011

Saddle Dam Work Saddle Dam Work -- $45M$45M--50M50MAward Scheduled Award Scheduled -- March 2015March 2015Contractor: TBDContractor: TBD

LegendGrout Curtain

Awarded Sep 2011Contractor: Bauer Foundation

Contractor: TBDContractor: TBD

RCC at Saddle Dam Concept

BUILDING STRONG®1

Grout Curtain Barrier Wall

Cave Feature Sinkholes

Existing Saddle Dam RCC Berm

Center Hill Dam Safety Project UpdateCenter Hill Dam Safety Project Update Barrier Wall contract

22% complete; completion pscheduled June 2015

Design of RCC Berm f S ddl Dfor Saddle Dam remediation underway; contract solicitation planned September 2015

Completion and Completion and normal Lake levels by Summer 2017

BUILDING STRONG®2