OR/14/012 Appendix 1 - GeoSure legends

Lee, K A, and Diaz Doce, D. 2014. User guide for the British Geological Survey GeoSure dataset. British Geological Survey Internal Report, OR/14/012.

Class	Collapsible deposits	Running sand	Compressible deposits	Slope instability (landslides)	Soluble rocks (dissolution)	Shrink swell
A	Deposits with potential to collapse when loaded and saturated are believed not to be present.	Running sand conditions are not thought to occur whatever the position of the water table. No identified constraints on land use due to running conditions.	Compressible strata are not thought to occur.	Slope instability problems are not thought to occur but consideration to potential problems of adjacent areas impacting on the site should always be considered.	Soluble rocks are either not thought to be present within the ground, or not prone to dissolution. Dissolution features are unlikely to be present.	Ground conditions predominantly non-plastic.
B	Deposits with potential to collapse when loaded and saturated are unlikely to be present.	Running sand conditions are unlikely. No identified constraints on land use due to running conditions unless water table rises rapidly.	Compressibility and uneven settlement problems are not likely to be significant on the site for most land uses.	Slope instability problems are not likely to occur but consideration to potential problems of adjacent areas impacting on the site should always be considered.	Soluble rocks are present within the ground. Few dissolution features are likely to be present. Potential for difficult ground conditions or localised subsidence are at a level where they need not be considered.	Ground conditions predominantly low plasticity.
C	Deposits with potential to collapse when loaded and saturated are possibly present in places.	Running sand conditions may be present. Constraints may apply to land uses involving excavation or the addition or removal of water.	Compressibility and uneven settlement potential may be present. Land use should consider specifically the compressibility and variability of the site.	Slope instability problems may be present or anticipated. Site investigation should consider specifically the slope stability of the site.	Soluble rocks are present within the ground. Some dissolution features may be present. Potential for difficult ground conditions are at a level where they may be considered, localised subsidence need not be considered except in exceptional circumstances.	Ground conditions predominantly medium plasticity.
D	Deposits with potential to collapse when loaded and saturated are probably present in places.	Running sand conditions are probably present. Constraints may apply to land uses involving excavation or the addition or removal of water.	Compressibility and uneven settlement hazards are probably present. Land use should consider specifically the compressibility and variability of the site.	Slope instability problems are probably present or have occurred in the past. Land use should consider specifically the stability of the site.	Soluble rocks are present within the ground. Many dissolution features may be present. Potential for difficult ground conditions are at a level where they should be considered. Potential for subsidence is at a level where it may need to be considered.	Ground conditions predominantly high plasticity.
E	Deposits with potential to collapse when loaded and saturated are present.	Running sand conditions are almost certainly present. Constraints will apply to land uses involving excavation or the addition or removal of water.	Highly compressible strata present. Significant constraint on land use depending on thickness.	Slope instability problems almost certainly present and may be active. Significant constraint on land use.	Soluble rocks are present within the ground. Numerous dissolution features may be present. Potential for difficult ground conditions should be investigated. Potential for localised subsidence is at a level where it should be considered.	Ground conditions predominantly very high plasticity.