Land for landfills. For heaps of coal in the open air, you should choose an area away from heat sources (boiler rooms, steam lines etc.); if possible please take care, that the heaps of coal have a natural or artificial cover from the side of the most frequently blowing winds. The land for landfills should be dry and have the possibility of rainwater drainage, this is in order to avoid undermining the heaps. Drainage can be done by draining or making drainage ditches. The ground of the landfill should be hard: concrete, paved or at least rolled. Remove any waste paper from the plant surface, tow, wood etc.. The surface of the base should be free from objects protruding from the base and should have a slope of at least 3 °.