This free to download document is designed and published in order to provide guidance with respect to hazardous gases for the safe drilling and piling through Coal Measures up to a maximum depth of 200m.
These gases include the most common such as methane, hydrogen sulphide, carbon dioxide and carbon monoxide but also less common such as hydrogen. It also includes oxygen deficient air. This guidance will only apply in the coalfield areas of Great Britain where the proposed activity will or is likely to intersect areas of unworked coal seams and former coal mine workings (including shafts and adits), henceforward referred to as just unworked coal and former coal workings, (which are in most instances the property of the Coal Authority).
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