| 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.
|