Includes stabilization of paving or building sub-grades with either lime or cement. Generally, cement is used for sandy soils with plasticity indices below 20, and lime is used for soils with a higher clay content and a "PI" above 20. The chemical is mixed with the upper 6-8 inches (in most cases) and greatly improves the soil's bearing potential - especially for high-traffic paving and areas of highly active soils. Stabilization of paving areas is generally more cost effective for areas of around 30,000 square feet and larger. Lime can often be mixed with on-site clay soils to "manufacture" select fill for building pads and save on costly importing and exporting.