What Is an UXO survey?
Unexploded Ordinance items, such as grenades, bullets and artillery, are often abbreviated to UXOs. An UXB is an Unexploded Bomb, and many UXOs and UXBs remain today on ex military training areas or areas targeted by air raids in World War II.
These prove an obvious health, safety and environmental risk, with significant cost implications if they cause damage. An UXO survey will assess whether there are any UXO causes for concern, which may be more common than you first think. Between 2006 and 2009, 15,000 UXOs were discovered on construction sites in the UK. A 1,000kg bomb was found in East London in 2008 which had the potential to cause considerable damage, thus highlighting the importance of an UXB or UXO survey.
A Geophysical UXO survey will typically detect large UXBs up to 5 metres, and smaller items which are buried up to 2 metres deep. London and Portsmouth areas are where the most World War II UXBs are found in the UK.
The identification and location of harmful artillery is often essential at the design stage of construction projects, and an UXO survey may be of particular relevance to the redevelopment of brownfield sites. There are many types of UXO surveys, and to choose the best option surveyors will assess a number of factors. They will look at the ground type, its proposed use, the likely type of UXO and its likely depth. The survey may be used to ensure health and safety, or for use in archaeological exploration. There are three types of UXO survey. Non-intrusive surveys involve the sensing of items from the surface, intrusive surveys involve data collection from sensors inside the ground, and marine surveys detect UXOs and other metallic objects under the sea.
Non-intrusive surveys can be conducted using different methods, with magnetometry being one of the more common options, such as Electro Magnetic Systems. Intelligent software manages the findings of UXO surveys into a comprehensive set of data, filtering out any ambient magnetics. This data is then assessed and demonstrated in a way which the client will understand.
Buried fuel tanks and air raid shelters are another reason why a geophysical survey may need to be carried out, as they can create construction problems. Geophysical surveys also show buried mineshafts, air voids and cavities such as vaults, crypts, sewers and heating ducts, and subsidence is a good indicator of such air voids. The prominence of badger sets also show up in these surveys, and as they are a protected species, they must be considered during construction works. Geophysical surveys can also be used to show the characterisation of land forms, which can be done on a big scale. Other uses for these surveys are reinforced concrete mapping, used for locating foundations and such, when more foundations or a borehole are required; and high frequency structural radar, used for showing features within a building, such as hidden flues and chimneys, historic features and voiding.
If an UXO is discovered in a geophysical UXO site survey, the surveyors will stop all works, evacuate the area and contact specialist disposal experts. Once the area is declared safe it will be possible to continue development. It is important to carry out UXO surveys to ensure work is carried out in a safe manner under general health and safety guidelines.
SUMO Services Ltd carry out all areas of geological surveying nationwide. Their services cover UXO surveying, utility mapping and detection, topographic surveying, archeological surveying and geophysical surveying.
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