The primary purpose of the EIA System is to enhance planning and guide decision-making in the preparation, design and implementation of development projects. Through the EIA process, adverse environmental impacts of projects are assessed and reduced through proper siting, design and formulation of environmental management and monitoring plans. The EIA is both a planning and a regulatory tool that is established to ensure that development projects will not cause undue harm but rather conserve, protect and enhance the environment and the quality of life of the people. The EIA system is meant to safeguard the environment and the human population therein while making the long-term operation of the project sustainable. Thus, the EIA is a tool to enhance environmental sustainability of the project.