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Project

Blu Harbor Development

Developer

Paul’s Corporation

Services

Geotechnical Engineering

Location

Redwood City, California

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Project Overview
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Geotechnical Engineer of Record

The Blu Harbor residential development is located in Redwood City, a seismically active region in California. Once a former marshland with a major slough until the late 1950s, the site was reclaimed by placing imported fill over the native compressible clay deposits, locally known as Bay Mud. The project site was formerly used as a private marina with approximately 50 boat slips. The 12½-acre site is surrounded by water on three sides, with an inner marina at the center of the site.

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Engeo's Role

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Challenges

ENGEO utilized a deep soil mixing technology brought from Japan to the US and designed a waterfront stabilization system for a high-density waterfront development project. Waterfront stabilization was deemed necessary to protect proposed structures and improvements from seismically induced lateral deformation.

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Solutions

The waterfront edge containment system of DSM columns provided the following benefits to this project:

  • The project site was planned to be raised by 5 feet to combat potential sea-level rise in the next 50 years. DSM spoils generated were used as engineered fill to raise site grades, which lowered total construction costs by reducing the amount of expensive import soil.
  • The DSM edge containment system consisted of interlocking DSM columns and panels that act as a below-grade gravity wall to resist potential seismic lateral forces. This allowed shallow foundations with higher bearing capacity to be used near the waterfront, reducing foundation construction costs.
  • The DSM edge containment system reduced the potential lateral deformations to tolerable amounts for the structures and improvements planned within the project site.
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Awards

2018 CalGeo Outstanding Project of the Year Award

2018 ASCE Geotechnical Project of the Year Award

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