The document discusses site preparation for construction projects, including site investigation, soil investigation, and ground water control. Site investigation involves collecting data about the site, including topography, hydrology, and existing infrastructure. Soil investigation determines site suitability and foundation design through methods like trial pits, augers, and sampling. Ground water control includes temporary dewatering methods like sumps and wellpoints, and permanent barriers like grouted membranes, contiguous piling, and diaphragm walls. Preliminaries works establish temporary facilities and ensure safety/compliance for a construction project.