COAL MINING RISK ASSESSMENT
If a site is located in a historic coal mining area, there could be a structural risk to proposed structures, and hence a coal mining risk assessment may be required in support of a planning application or to satisfy the requirements of a warranty provider such as the NHBC.
The risk assessment is similar to that of contaminated land risk assessment, in that it begins with a desk study to identify any coal mining activity or features in the vicinity of the site. The desk study typically involves the acquisition of historical and geological maps to identify any coal mining activity or features in the vicinity of the site, and is often supported with information from the Coal Authority and other relevant parties.
If risks cannot be ruled out by the desk study, intrusive works must be carried out to ascertain whether or not there are any significant voids or coal bearing strata beneath a site. This typically involves the use of rotary drilling techniques to extend boreholes to a depth suitable for risks to be safely discounted.