Home / Services / Geotechnical / San Francisco, CA
San Francisco, California
Geotechnical Engineering in San Francisco, CA
Subsurface investigations, laboratory soils testing, and geotechnical reporting to characterize site conditions before design and verify them during construction. San Francisco and the surrounding CA area is covered on a project basis through our Sacramento, CA regional hub.
- Dispatched from
- Sacramento, CA regional hub · project-based mobilization
- Lead time
- Set in the proposal, with mobilization planned around your pour and earthwork schedule
- Laboratory
- Sugar Land, TX laboratory under chain of custody, or a mobile laboratory for large projects
- Reporting
- Reviewed and issued under a documented quality system; formatted for owner, engineer, and building-official review
- Serving
- San Francisco and the surrounding CA area — Los Angeles, San Diego, San Jose
- Coverage
- California statewide · 27 regional hubs
- Technicians
- ACI- and NICET-certified field staff; licensed professionals in California
- Call us
- (346) 420-5425
Scope
Geotechnical services in San Francisco
- Soil borings and sampling programs sized to the structure and site
- Laboratory index testing: Atterberg limits (ASTM D4318), moisture content (ASTM D2216)
- Moisture-density relationships and bearing evaluation for foundations and pavements
- Expansive-soil characterization for slab and pavement design
- Construction-phase verification: proof rolls, subgrade acceptance, fill placement observation
ASTM D4318ASTM D2216ASTM D698ASTM D1557
Full scope, standards list, and pricing basis: Geotechnical Engineering.
Local conditions
Geotechnical conditions in San Francisco
San Francisco sits on a patchwork of native bedrock, compressible Bay mud, artificial fill, and liquefiable sand deposits — conditions that have driven costly foundation failures and performed dramatically during seismic events. California Building Code Title 24 and the City's own site-permit requirements mean geotechnical documentation is rarely optional; it is a precondition for design and for permit approval on most projects of consequence. Before a structural engineer can size a foundation or a contractor can commit to an earthwork bid, the subsurface needs to be understood, not assumed. We perform subsurface investigations, laboratory soils testing, and geotechnical reporting that characterize conditions before design begins and verify soil performance at critical stages of construction. Work in San Francisco is dispatched through our Sacramento regional hub, serving scheduled and project-based assignments. The laboratory operates under a documented quality system, and field technicians hold ACI and NICET certifications.
San Francisco projects frequently encounter filled ground — some dating to nineteenth-century shoreline expansion — over soft Bay mud or loose sand that may be susceptible to liquefaction under seismic loading; foundation design and earthwork specifications must account for these variable and potentially problematic soil profiles. The mild but wet winter season can interrupt drilling operations and affect moisture-sensitive earthwork, making early investigation scheduling and clear construction-phase observation windows important for project timelines.
FAQ · San Francisco
My site is in a San Francisco liquefaction or landslide zone — what additional investigation work does that trigger?
San Francisco's Seismic Hazard Zone Maps, adopted under the California Seismic Hazard Mapping Act, require site-specific geologic and geotechnical investigation when a project falls within a designated zone. This typically means deeper borings, Standard Penetration Testing per ASTM D1586, grain-size and Atterberg limits testing per ASTM D422 and ASTM D4318, and a written assessment of liquefaction potential or slope stability submitted to the City's Department of Building Inspection.
How does the presence of historic bay fill affect the scope of our soil borings?
Artificial fill in San Francisco is often heterogeneous — mixtures of sand, debris, and organic material placed without engineering control. Its variable compressibility and seismic behavior require a wider boring layout to detect lateral changes, and laboratory consolidation testing per ASTM D2435 is commonly needed to estimate settlement under structural loads. Fill thickness and composition must be documented before a foundation engineer can commit to a design approach.
What soil laboratory tests are most commonly required for a San Francisco foundation project?
Typical testing for urban San Francisco foundation work includes grain-size analysis (ASTM D6913), Atterberg limits (ASTM D4318), moisture content (ASTM D2216), consolidation (ASTM D2435), and unconfined compressive strength (ASTM D2166) on cohesive samples. Projects with liquefiable sand concerns may add cyclic or index testing to support the liquefaction analysis. The specific battery is driven by soil types encountered and the geotechnical engineer's analytical needs.
Which office covers geotechnical in San Francisco, CA?
Field work in San Francisco is dispatched through the Sacramento, CA regional hub, about 75 miles away. Laboratory testing is performed in Sugar Land, TX under chain of custody, or in a mobile laboratory mobilized to large San Francisco projects.
Are the technicians you send to San Francisco certified?
Field sampling and testing in San Francisco are performed by our ACI- and NICET-certified technicians. Geotechnical engineering and professional services are delivered with professionals licensed in California, coordinated under one proposal.
Hiring for project coverage. Field technician openings in San Francisco · all positions.
Scheduling & proposals
Need geotechnical engineering in San Francisco?
Call to schedule a technician, or send project documents for a written proposal.