The purpose of a drilling and sampling program is to obtain samples that reasonably represent subsurface conditions over the entire project site. Sampling type and frequency is dependent upon both the type of material encountered and the purpose of the investigation.An important basis for the planning and construction of building and infrastructure projects (comprising various types of structures as foundation, excavation pit, land reclamation, beach nourishment etc.) is the knowledge of the ground conditions. For this purpose, the geotechnical investigation with its respective services shall be carried out. Their nature and extent depends on the type of the structure, the difficulty of the structure and the expected ground conditions.