In addition to the traditional soil conditions under which ground improvement is often implemented, as described in Chapter 8 (e.g., loose, coarse-grained soils; soft, fine-grained soils; or loose, non-engineered fills), there are a number of special natural geologic conditions that produce problematic soil deposits and may require treatment. These include:

Highly compressible organic soils

Liquefiable coarse-grained soils

Collapsible soils

Expansive soils

Highly sensitive “quick” clays

Dispersive soils

Corrosive soils

High-sulfate soils

Unusual or special soil conditions