Why?
The surface should be maintained in as natural condition as possible because soils that are wet at the time of construction are more likely to have problems with acceptance of wastewater due to compaction and smearing. Compaction is the compression of soil particles, which closes the pore spaces. Smearing is spreading and smoothing soil particles by sliding pressure. If considerable construction activity has caused smearing or compaction, then the ability of the soil to transmit liquid will be seriously reduced and failure is more likely. Plastic limit is defined as the minimum water content at which the mixture acts as
