1. Kentucky River Lock and Dam No. 8 A Major Qualifying Project for Stantec Consulting Services Inc. Michael Kendall Karyn Sutter

2.  Major Qualifying Project  Stantec Project Center ◦ Project Advisors  Professor Suzanne LePage  Professor Frederick Hart ◦ Stantec Consulting Service Inc. Mentors  Daniel Gilbert  April Welshans  Adam Hacker

3.  LD 8 Foundation Improvement ◦ Karst Features ◦ Water Quantity and Quality Concerns ◦ Foundation Stability

4.  Evaluate Existing Dam Conditions  Develop Design Options  Apply Evaluation Criteria to Design Options  Create a Preliminary Design of Best Foundation Improvement Option

6.  Boring Layout  Water Pressure Tests Exploratory Borings by Geological Region

7.  Materials ◦ Portland Cement ◦ Admixtures  Design Techniques ◦ Grout Curtain ◦ Grout Cap

8. Secant WallsDiaphragm Walls

9.  Design Selection ◦ Evaluated Existing Conditions ◦ Developed Three Design Options DesignDescription Design 1Grouting in all regions Design 2 Grouting in all regions, secant wall in region 2 Design 3Grouting in all regions, secant wall in region 2, 3 and 4 Design Options

10.  Application of Evaluation Criteria ◦ Cost ◦ Environmental  Permitting ◦ Risks  Reduction in Seepage  Foundation Damage ◦ Constructability  Dewatering  Site Access  Design Creation

11. GroutingCut-off Walls RegionRecommended Grout Curtain Depth Elevation (NAVD88) Approx. Length @ 15° Inclination (ft.) Region 143072.5 Region 242578.0 Region 345352.5 Region 444377.5 RegionRecommended Cutoff Depths Elevation (NAVD88) Length (Ft.) Region 246535 Region 345545 Region 447535 Each Secant Shaft Designed with a 4 Ft. Diameter with a 1 Ft. Overlap on Each Side Two Row Curtain with 16 Ft. Space Between Rows and Injection Holes every 6 Ft.

12.  Cost DesignTotal Cost Design 1: Grout Curtain Throughout $2,506,804 Design 2: Grout Curtain Throughout, Secant Wall in Region 2 $2,948,554 Design 3: Grout Curtain Throughout, Secant Wall Regions 2, 3 and 4 $5,024,554 Design Option Costs

13.  Environmental ◦ Identical Permitting Requirements  Risks ◦ Mostly Dependant on Grouting ◦ Seepage Reduction Crucial  Constructability ◦ All Designs Practical ◦ Verifiability of Technique

14.  Selected Design 2: Grout Curtain Throughout with a Secant Wall in Region 2 Design of Proposed Foundation Improvement

15.  Highest Water Loss Observed through Region Two  Favorable Cost to Permeability Reduction Ratio  Practical Design