NX were employed by the client to carry out a Phase 1 ground stability risk assessment, Phase 2 geotechnical site investigation, a drill and grout specification and supervision throughout remedial drill and grout works on a former colliery. Ground conditions were complex with large shallow coal seams and nearby mine shafts had resulted in damage to existing buildings. Ground gas concentrations were also high and a suitable ground gas risk assessment was required to establish acceptable gas protection measures.


NX’s site investigation design, monitoring and verification enabled the site to be developed with minimum risks to adjacent buildings and nearby residential housing.