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When it comes to risk mitigation, the first thing we undertake when a detailed risk assessment raises concerns regarding the liklihood of UXB or UXO  is an non intrusive survey.

It is important that where a viable risk is identified, it is effectively and appropriately mitigated to reduce the risk to "As Low As Reasonably Practicable" (ALARP).
However, it is equally important that UXO risk mitigation measures are not implemented when they are not needed.
Initially we will carry out a Non-intrusive initial UXB and UXO Survey is carried out, this makes sure that a project site location is first checked for shallow buried items around 4 metres depth for (UXO's/UXB's) so that staff and assets can continue operations safely.
This type of survey is very effective at detecting buried items of Land Service Ammunition, for example: grenades, mortars, incendary and projectiles.
This well-tested survey approach is a reliable way of reducing UXB and UXO risk on Greenfield land projects, and is also suitable for shallow water (for example: inland waterways and lakes).
In optimum ground conditions, the survey system can detect a buried 50kg German iron bomb at a depth of around 4m below ground level, but isn’t appropriate for clearance ahead of deep foundations and piled foundations.
When it comes to the UXB,s of 50Kg, 250Kg, 500Kg, and 1000Kg these can easily be found at depths of 20 metres or more depending of the ground makeup.
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On the completion of the Non-intrusive survey ,if it raises concerns about the liklihood of UXB /UXO ordnance at depth, after consultation it would be followed by the Intrusive UXO Survey allowing the project to be quickly and efficiently checked for deep buried unexploded bombs (UXO's/UXB's) so that development can continue safely.
On projects where there is a real risk of encountering UXO/UXB has been assessed, and where deep intrusive groundworks such as piled foundations are planned (more than 4 meters below ground level) It is esential an Intrusive Magnetometer Survey will provide detection and clearance ahead of individual pile locations, clusters and boreholes.
This survey method provides detection of items of ordnance at depths not achievable by Non-intrusive UXO Survey methods, or in ground conditions which have gross surface ferro-contamination.
This survey method is a reliable way of minimising UXO and UXB risk on both Greenfield and Brownfield land sites.