1st Line Defence - Unexploded Ordnance (UXO) Intrusive Survey

If Non-intrusive UXO Survey methods cannot provide clearance to full bomb penetration depth, intrusive survey techniques can also be deployed. This may include hydraulic push or drilling methods to insert magnetometer probes into the underlying strata to survey columns of ground which will provide clearance from UXO, allowing clients to undertake intrusive works such as piling or drilling in certified cleared locations with confidence. This allows for a check of both ferrous anomalies directly beneath the probe (the probes have look-ahead capability), and for any horizontal deviation of the probe (detected by inclinometers in the probe body) so that if necessary the survey can be terminated or corrected. Each survey position provides a column of clearance down to an assessed maximum bomb penetration depth (which for generic London clay can be up to 12m below ground level), and we can often check multiple pile locations per survey – reducing the overall number of surveys required.