This document discusses excavation, foundations, and sustainability. It provides information on different machines used for excavation like bulldozers and backhoes. It also discusses industries involved in excavation like general contractors. The document discusses the need to protect excavation sides from caving and dewatering techniques. It provides details on different foundation types like shallow foundations, deep foundations, and types of piles. It discusses factors affecting foundation choice like subsurface soils and groundwater. Finally, it discusses concepts of sustainability relating to economy, society and environment.