EM + GPR Utility Clearance Survey in Nanaimo, BC

EM line tracing is largely soil-independent — it follows the signal on the conductor regardless of what's around it — but GPR, the half that finds non-conductive plastic and clay lines, is very soil-sensitive. Nanaimo sits on predominantly till and sandstone benches — with documented historic coal workings beneath parts of the city. Standard till performance at surface, but Nanaimo's defining subsurface feature is its coal-mine legacy: old workings and shafts underlie several neighbourhoods, making void detection a local specialty. So in Nanaimo we lean on EM for the metal and tracer-wired lines and set realistic GPR expectations for the plastic — which is exactly why running both methods matters here.

The local mix follows the building stock: Harbour-city mix of heritage districts, mid-century suburbs, and rapid hospital-area densification. Underneath that, the everyday Nanaimo locate is private water and irrigation services, power to outbuildings and gates, gas to outdoor features, and the plastic mains that need GPR or sonde tracing — the private-side utilities no public locate covers.

Yes. BC One Call marks member utilities' public lines to the property line across Nanaimo and all of BC — it does not locate the private services beyond it, which is where most strikes happen. The EM + GPR clearance survey covers those private lines. Use both: BC One Call for the public locates, a private dual-method locate for everything on your side.

Province-wide pricing — no regional premium for Nanaimo or anywhere in the Vancouver Island. A focused clearance (a dig area, a fence line) starts in the low-to-mid hundreds; full-site mapping and SUE-grade work are quoted by scope. The free phone consult (604-239-9934) gives a firm number in about five minutes. Mon–Sat, 8am–6pm PT.

BC One Call (the provincial one-call service) notifies member utilities to mark their PUBLIC lines up to the property line — it does not cover the privately-owned lines beyond it: your water service, irrigation, private power to a garage, gas to a fire pit, septic, and so on. A private utility clearance survey finds those. Every responsible dig uses both: call BC One Call for the public locates, and hire a private locate for everything on your side of the line.

Because no single method finds everything. EM traces conductive lines precisely but is blind to non-conductive plastic and clay; GPR images the subsurface including non-conductive lines but can't label which conductive line is which the way an EM trace can. Run together, EM identifies and traces the metal and tracer-wired lines while GPR catches the plastic, the clay, and the unknowns — and each confirms the other. Dual-method is the standard a defensible locate is held to.