1. TH 53 Relocation Project

2.  We have to penetrate large boulders and some of the hardest rock in the world  To know what we can get in the ground  To know how long it will take to install foundations  To determine a cost basis for installation

3.  Determine the best tooling for drilled shaft installation.  To determine the most efficient and economical foundation type  Apply knowledge to larger contract  Help determine preferred alternative

4.  8 Piers, two abutments  If drilled shafts, likely 6 drilled shafts per pier  = large risk for future contract

6.  One 8’ diameter drilled shaft ◦ No load test  Multiple drilled round pile – likely 16” diameter. ◦ Load test at least one  Will allow use of appropriate load factors for bridge design (rather than assumed)  Use of specific load factor allows for efficiency/savings of foundation design – can reduce # of pile (St. Croix)