The Department of General Services contracted with Condon-Johnson & Associates (CJA) to install a seawall property adjoining the San Quentin State Prison.

The Challenge
In order to protect the work site and limit sedimentation CJA first installed a sheet pile enclosure draped in geo-textile. Inside this enclosure, CJA installed precast pilasters with precast facia panels. Installation had to be closely scheduled to maximize work hours around low tide.

The Solution
Eighty-two pilasters were installed utilizing an AF-18 drill rig by IMT. Piles were installed to depths of 40’ in sandy overburden and siltstone bedrock. Each pilaster was then tied back with a double corrosion protected anchor installed with a Klemm drill.

Native on-site material was drilled, shot and excavated for use as backfill behind the wall. As part of this contract, Rip Rap was placed to protect the front of the wall.

The Result
The project covered a length of 2,200’ that included 1,200’ of pilaster wall, and 1,000’ of Rip Rap protection. The project was valued at $ 5.3 million.

Featured Expertise:

Soldier Pile & Lagging
Shotcrete Facia