In many parts of the Netherlands Unexploded Ordnance (UXO) from World War II, including aerial bombs, grenades, mines and ammunition, can still be found in the subsurface. UXO investigation maps the risks and the presence of explosives left behind in World War II.
Our UXO survey consists of 3 phases: Phase 1, the historical preliminary research, is a desk research. Phase 2 and 3 are field surveys.
- High quality historical research which reduces the area to be surveyed in the detection phase.
- Use of innovative detection techniques gives a 3D image of the objects detected and reduced the amount of objects to be removed.
- T&A is independent has no interest in extensive, superfluous digging activities.
- UXO investigation can be combined with geophysical of environmental research.
The preliminary analysis consists of two phases, in which several activities are carried out.
I - Problem inventory
Historical facts are collected and analysed. Based on the outcome of this research, we determine the possibility of UXO being present in the subsoil of the investigation area. This is done by:
- Literature study
- Archival research
- Interviews with local inhabitants and eye witnesses
- Aerial photography interpretation
II - Problem analysis
In the problem analysis phase the collected facts are analysed in detail. This phase will only be carried out if the problem inventory gives rise to it and consists of the following activities:
- Interpretation of data
- Risk analysis
- Project specific advice
The PRA is not a mandatory step between the historical preliminary research and te field research (detection and approach of UXO). In some cases however the PRA can be of added value to reduce time and costs:
- During the historical preliminary research the suspect areas have not yet been been vertically defined and the post-war groundworks have not yet been mapped.
- The planned activities are very diverse and extensive and the UXO research is likely to be expensive and has to take place in a restricted timespan.
Experience tought us most municipalities have a seperate historical research perfomed for every single project involving earthworks. In growing communities the research costs can become very high over the years. A once-off investment in a community wide historical preliminary research generally costs five times as much as an individual one and will therefor pay off quickly. Communities T&A has already performed a historical research project for are Deventer, Haarlemmermeer, Tiel and Voorst.
Advantages of a community wide historical research project:
- Great service from municipality to its citizens, project developers and city administration;
- Information about UXO risk is always at hand;
- Risk calculation of projects made easier;
- Independence of interpretation of other parties;
- No necessity for last-minute, emergency UXO surveys;
- Valuable document for city development planning.