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Rockridge Geotechnical

Rockridge Geotechnical

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Avanza 490

490 South Van Ness Avenue, San Francisco, CA

Avanza 490 is an 81-unit affordable residential complex geared at people making 30-60% of the area median income. Amenities revolve around community areas, from indoor community rooms to play areas for children to rooftop courtyards.

Site Square Footage: 14,250 sq. ft.

Date Completed: 2020

Client: BRIDGE Housing, Mission Housing Development Corporation

Architect: Ankrom Moisan Architects, G7A

Structural Engineer: Dolmen Consulting Engineers

Civil Engineer: KCA Engineerings, Inc

General Contractor: Nibbi Brothers and Guzman Construction

Rockridge Geotechnical (RG) performed a geotechnical investigation and provided geotechnical services during construction of this seven-story building. The building is founded at-grade with a partial single-level basement.


The primary geotechnical issues affecting the proposed development included existing fill underlying the site, providing adequate foundation support for the proposed building, and a relatively shallow groundwater table. RG provided recommendations for the building to be supported by a mat foundation bearing on ground improved with drilled displacement columns. RG provided consultation during final design and construction permit application. RG also provided geotechnical observation and construction services during construction; these services included observation during the installation of the drilled displacement sand-cement column ground improvement system and subgrade preparation for the mat foundation.


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