The excavation or h2o substitution strategy is beneficial for soils that happen to be much too unfastened to collect an intact Main or clod, or for soils that contains gravel. The two the intact clod and excavation strategies are described intimately by Cresswell and Hamilton (2002). GeoTech Engineering Minimal (GEL) https://dedicatedserverforbroadca07628.bloguetechno.com/construction-soil-investigation-bd-secrets-68448954