the process is controlled, ensuring that human health is not endangered or harm to the environment does not occur. Landfill sites are often used mineral working , which are required to be infilled after use and use and consequently, the disposal of certain types of waste such as treated and inert wastes into landfill, can be beneficial and eventually result in recovered land. A further major consideration for landfill disposal is the leachate, the potentially toxic liquid residue from the site, which may enter the water course.