Knowledge for
what comes next

Why investigate before excavation?

Existing records may not fully describe what is buried at a site. A planned investigation can add evidence to help project teams assess potential services and choose where further verification is needed.

Geophysical results complement records and safe excavation procedures; they do not replace confirmation of a utility’s position.

GPR and ERT: choosing a method

GPR is often suited to near-surface features and can provide detailed information where ground conditions allow. ERT measures resistivity variation and is often used for broader ground and groundwater studies.

The right choice depends on the question, target depth, surface access and ground conditions. The methods may also be combined.

What makes a useful survey brief?

Share the site location, the decision to be made, expected targets, desired coverage and depth, available drawings, access conditions and any schedule constraints. This helps define a realistic scope and deliverables.