Many sites, while potentially suitable for development, are underlain by soils, the properties of which would make the development uneconomical using conventional construction methods.  Examples of these sites include rock dumps, uncontrolled fills, waste disposal sites, deeply leached residual soils and aeolean sands.  These materials are unstable in their natural state due to their compressibility and settlement that could occur with change in moisture content.  With correct treatment, these materials can be over-consolidated to provide bearing capacities which allow conventional construction techniques to be employed.