If any potential risk or need for further research is identified during the Preliminary Risk Assessment, we would always recommend a Detailed UXO Risk Assessment is commissioned.
​This is a comprehensive and in-depth desk study report which fully examines the history of a project site location and potential risk.

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The purpose of a detailed risk assessment is to examine the location, using all resources available, the likelihood of encountering explosive ordnance during works at a site.
The associated risk at the location will be defined and if necessary a plan for recommendations, Danger UXB have a reputation for producing comprehensive and detailed UXO and UXB Risk Assessments in the industry.
Fully compliant with CIRIA C681 (Unexploded Ordnance, (A Guide for the Construction Industry), the reports allow the potential risk on any site to be fully qualified.

The detailed Risk Assessment covers five specific areas

​The risk that the site was contaminated with UXB or UXO:
The risk that a site could have become contaminated with a UXB or UXO, makes up the main part of our historical research. What we are clarifing and assessing is the likelihood that a UXB or UXO could have fallen within an area and gone unnoticed and unrecorded as It may have been lost, burnt, buried or otherwise discarded by military personnel. No UXO assessment can rely on a single source of information, j ust because a bomb fell on a site does not necessarily mean that there is a UXB or UXO risk. The site needs to be thoroughly examined in its historical context, what was it used for during the war, how frequently would it have been accessed, was it damaged, what was the nature of the groundcover, would it have been subject to post-raid checks.
For bombing risk, we break this section into five subsections. 

The risk that a UXB or UXO remains:
This is a primary key consideration, and concentrates on factors such as postwar development, and whether any UXB or UXO clearance operations have already been undertaken.
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​While the risk of contamination on a site during WWII might have been high, the entire area may have been excavated post-war, thus removing the risk. Conversely, if a site has not been touched since the war, the risk of UXO remaining will not have been reduced. 

​The risk of encounter:
It may be considered that a site could have become contaminated, and that any UXB or UXO is likely to remain. However, the risk that it would be encountered would depend largely on what was being planned on-site. For example, bulk excavation over the entire site area would mean an item of unexploded ordnance remaining is highly likely be encountered. 

The risk of initiation:
Even if a UXB or UXO ordnance is encountered, it does not necessarily mean it will detonate.
​This will depend on factors such as the energy with which it is struck.
​We also need to factor in what works are being planned, for example ‘percussive piling’ may pose a greater risk than careful ‘hand-digging’. 

Consequences of initiation or encounter:
The final section in the risk assessment is the consequences of initiation on any site, in truth it could be potentially be severe.

However another consideration is the consequence of simply encountering UXB or UXO, this can result in significant downtime which for larger sites can mean very significant costs.
​Even a suspected item of unexploded ordnance can result in site closure for a significant period of time.

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On completion of the detailed risk assessment, we will provide you with our recomendations for moving forward which will be based on the risk of encountering  a UXB / UXO on your construction site and how to mitigate the risk. 

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