Project

Treasure Island / Yerba Buena Island Redevelopment

Developer

Treasure Island Community Development (TICD)

Services

Geotechnical Engineering Environmental Management Construction Management Value Engineering Earthquake Engineering Construction Observation and Testing SWPPP Laboratory Testing Special Inspection

Location

San Francisco, CA

Project Overview
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ENGEO is the Geotechnical Engineer of Record.

The project provides a new, high-density, mixed-use community with a variety of housing types, a retail core, open space and recreation opportunities, on-site infrastructure, and public and community facilities and services.

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Engeo's Role

In 2014, 2015, and 2016 ENGEO conducted the design-level geotechnical study for the first Major Phase of development, an approximately 171-acre parcel with a new ferry terminal, approximately 3,700 residential units, and 100 acres of parks and open space.

At Yerba Buena Island, the geotechnical considerations and design features include: slope and foundation design issues associated with existing cut slopes and hillside fills; stability of existing retaining walls; slope stability issues associated with the steep perimeter slopes; slope stability issues associated with the slopes under and adjacent to the Treasure Island Road Viaduct.

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Challenges

The main geotechnical challenges at the site included:
(1) seismic stabilization of the perimeter shoreline and causeway that connect Treasure Island to Yerba Buena Island,
(2) mitigation of long-term static settlements under the development footprint due to the presence of Bay Mud, and
(3) mitigation of liquefaction-induced settlement within the development footprint.

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Solution and Outcome

Co ordination

ENGEO designed and managed a large scale ground improvement test section, high-end cyclic testing on the soils and finite element dynamic analyses to demonstrate that a proprietary ground improvement technique would stabilize and mitigate liquefaction-induced lateral spread, thereby making high-rise development feasible, and saving over $5MM in the process.

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