Is there a typical soil resistivity for San Francisco–Oakland?+
No citywide value can represent a parcel, substation, route, or facility. The Bay Area changes from cool coastal conditions to warmer, drier inland valleys. Bay fill, estuarine deposits, alluvium, residual soil, bedrock, and old utility backfill can occur within one regional project. Field measurements must be tied to the actual array, location, spacing, orientation, and current condition.
Does Wenner electrode spacing equal test depth?+
No. Larger spacing generally samples a larger earth volume, but spacing is not an exact one-to-one depth. Layering, array geometry, site boundaries, and conductive features affect the apparent response.
What information is needed to scope a San Francisco–Oakland survey?+
Send the site plan, survey objective, grounding or corrosion design request, proposed stations and spacings, final grading information, candidate line corridors, utility-clearance responsibility, access rules, schedule, and required report format.
Can Calicore mobilize outside California?+
Yes. Calicore performs project-based Wenner field programs throughout the United States when the station count, spacing, access, schedule, and mobilization are practical.
