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Rockridge Geotechnical

Rockridge Geotechnical

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The Tillery

1696-1758 Villa Street, Mountain View, CA

Located in Mountain View, this three- to five-story, wood-framed building will provide the community with 226 luxury units over two levels of subterranean parking.

Site Square Footage: 143,315 sq. ft.

Date Completed: 2022

Client: Prometheus Real Estate Group, Inc.

Architect: BDE Architecture

Structural Engineer: Nelson Structural

Civil Engineer: Kier & Wright

General Contractor: SBI Builders

Rockridge Geotechnical (RG) performed a geotechnical investigation for the project and consulted with the development and design teams from the early stages of the project through entitlement, design development, and construction.

The primary geotechnical issues identified during the investigation were shallow groundwater relative to the building excavation depth and potentially liquefiable soil lenses below the foundation level. To reduce the potential for dewatering-induced settlement of adjacent improvements during construction, portions of the excavation shoring system consisted of a continuous soil-cement mix (SMX) wall. Soldier piles and tiebacks were installed in some of the SMX columns to provide lateral restraint. RG concluded a mat foundation would be the most suitable foundation system for the below-grade portions of the structure, and the at-grade portions could be supported by deepened footings.

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