In my opinion, these costs of environmental and social mitigation are not excessive for the project developer because the environment and social in the project area lose a lot of benefit. The environment loses a lot of natural resources such as the forest in the project area and the habitation of animal. In the social, people in the project have many bad effects from construction the dam such as people lose their original job in the area, people will migrate from their land, and people get the flooding in the area of construction the dam. All of the problems make much damage to environment and people in the social. Therefore, the compensation from the government is not enough for people. The government should pay attention to people and go to solve the problem from construction the dam