Residential Work

House Expansion and Stabilization in Mill Valley

With spectacular views, houses on slopes have the potential challenge of sliding and drainage issues. Our involvement in the project included underpinning of the existing foundations for a major expansion of the crawl space areas as well as design for large openings with long span moment frames. In addition the driveway and garage retaining walls were stabilized with drilled piers, haunches, and heavily reinforced grade beams.

New 4-story House in Sausalito

DAC was the structural engineer for the project.  Due to the site conditions and limitations, a 24-foot deep excavation was considered for development of this zero lot line project.  Due to immediate proximity of adjoining neighbor’s buildings, there was a challenge in performing construction excavations, shoring, and retaining wall developments.

New Guest House in Los Pinos, Nicasio

DAC was the geotechnical engineer for the project.  The vast reaches of the site parcel starting from the top of a hill extending downslope, gave the project architect the opportunity to create a successful modern design with spectacular view of the opposing hillside.  As the house spanned over variable subsurface materials, the foundation system consisted of both drilled piers into Franciscan Mélange and shallow foundation on exposed bedrock.

Dream Home in Mill Valley

DAC was the structural and civil engineer for the project.  The site geology included liquefiable soils and therefore, the foundation would require driven piles or drilled piers.  Due to the presence of groundwater and caving soil conditions, the approach was modified to helical piers with concrete grade beams. Grading and drainage of the project also needed to consider environmental and hydrological aspects of the riparian nature of the site.