Slope stability – will the slopes collapse and cause
danger to persons and property?
Surface water flooding – are the drainage arrangements
adequate to prevent flooding during heavy rainfall?
Groundwater rebound – to what level will the groundwater
rise following the end of quarrying and how might it effect
any afteruse? Also will the groundwater levels in residual
ponds etc. vary?
Settlement of the ground surface – key items of concern
are whether any backfill within the quarry has been properly
and uniformly compacted and whether there are buried steps
or benches beneath any fill within the quarry that may cause
problems for any built development or installed services.
Lagoons – these may represent a long-term hazard unless
the structure has been properly capped so that there is no
risk to people, equipment or vehicles travelling over the former