The Swansea Five Feet coal seam crops out alongside and dips beneath Cefn Hengoed School in Swansea and a Coal Mining Risk Assessment (CMRA) was essential. At the initial 3G pitch position selected by the Client, the coal seam (and identified coal mine workings) was present within influencing depth of the surface. Our assessment, based on the phase 1 desk study information and the data from the initial site investigation, provided an alternative pitch position with a lower subsidence risk. This was then subjected to further investigation of the shallow soils as it lay close to the crest of a steep slope which was suspected to be the margins of filled ground.
The investigation confirmed the low subsidence risk and the shallow soils to be filled ground. Recommendations were provided for the design and construction of the pitch to ensure that subsidence and stability risks remained low.
The Client benefited from our experience and holistic approach to assessing potential hazards to provide a suitable position for the new pitch.
