What matters most
To scope a nationwide Wenner survey, send the project location and layout, test purpose, governing method and edition, requested stations and spacings, target facilities, construction stage, utility-clearance responsibility, access rules, terrain, work windows, safety requirements, and required deliverables. Calicore can then review feasibility and propose the field and reporting plan.
Key takeaways
- Define the receiving engineer and design use.
- Provide plans and maximum spacing before pricing.
- Assign utility locating and access responsibilities.
- Match deliverables to the grounding, corrosion, or investigation workflow.
Provide the technical basis
Identify whether the work supports grounding, corrosion, a route comparison, failure investigation, or another decision. Attach the specification and state whether ASTM G57-20, IEEE 81-2025, an owner procedure, or another basis governs.
List desired spacings, number of stations, units, repeat requirements, orientations, layered-earth interpretation, electronic format, and the person who can resolve field changes.
Describe the site the crew will encounter
Provide CAD or PDF plans, coordinates, property limits, access routes, terrain, surface cover, vegetation, pavement, rock, wetlands, crops, fences, overhead lines, buried utilities, active construction, and security or safety rules.
State who provides utility locating, escorts, badging, traffic control, environmental clearance, landowner permission, and permission to drive electrodes.
Build a realistic mobilization and reporting schedule
Nationwide programs are priced around travel, daily station production, maximum spacing, access between sites, work-hour limits, weather, terrain, and reporting—not only the number of readings.
Define the field window, design milestone, preliminary-data need, final report date, invoicing requirements, and whether multiple trips or seasonal repeats are contemplated.
If the scope is still uncertain, send the plans and the engineer’s request. Calicore can help translate “we need soil resistivity” into a practical station, spacing, access, and deliverable matrix.
This page provides general educational information, not a grounding-system design, cathodic-protection design, installed-system acceptance test, or parcel-wide resistivity conclusion. A Wenner result is apparent soil electrical resistivity for the documented array, spacing, location, orientation, and field condition. The responsible grounding or corrosion engineer must evaluate the complete dataset, earth model, asset geometry, governing documents, and uncertainty.
Frequently asked
Questions about this topic
What information is needed for a quote?+
At minimum: location, site plan, intended use, station count, spacing sequence or target depth/model, access, utility-clearance responsibility, schedule, and desired report.
Can Calicore help select stations and spacings?+
Yes. Provide the project layout and receiving engineer’s objective so the proposed matrix can be reviewed before mobilization.
Does Calicore travel nationwide?+
Yes. Appropriate programs can be mobilized throughout the United States, with scope and pricing based on site logistics and technical requirements.
Primary references and further reading
- ASTM International — ASTM G57-20 Official record for the Wenner four-electrode field and four-electrode soil-box method.
- IEEE Standards Association — IEEE 81-2025 Current IEEE guide for measuring earth resistivity, grounding-system impedance, and earth-surface potentials.
- Soil Tests Laboratory — Wenner Four-Pin Testing Calicore Engineering’s testing division and field-service information.