Is there a typical soil resistivity for Portland–Vancouver?+
No citywide value can represent a parcel, substation, route, or facility. The Portland region has wet winters and dry summers. Columbia and Willamette River alluvium, glacial-flood deposits, volcanic-derived upland soils, and engineered fill can differ in density, moisture retention, and electrical response as moisture changes. 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 Portland–Vancouver 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.
