Earth Retention

Location: Oak Harbor, WA

Project Partner: Hoffman Construction

Challenge: Installation of water-tight shoring for excavation below the water table and high capacity micropiles.

Overview: Condon-Johnson was contracted to design and install the sheet pile and tieback shoring along with 306 micropiles with design loads over 350 kips.

Results: Condon-Johnson was able to successfully design and install a shoring system below the water table utilizing sheet piles for ground water cutoff and tiebacks. The tiebacks were able to be installed and locked off using a specialized water sealing system which mitigated ground loss during and after the tieback was installed. At the base of the excavation, over 300 micropiles were installed to support the new water facility.