119. When the height of the residual materials reaches the ground surface at the perimeter of the landfill, the remote landfill must be covered with a layer of materials at least 30 cm thick consisting of soil including a layer at least 15 cm thick that is suitable for vegetation, or consisting of a layer of another material not more than 30 cm thick that is suitable for vegetation. Any raising of the ground surface at the perimeter of the landfill is prohibited.
In order to allow water to flow away from the landfill and limit soil erosion, the final cover must also be graded to a slope of at least 2% without exceeding
(1) 5%, if the slope at the perimeter of the remote landfill does not exceed that percentage; or
(2) the percentage of the slope at the perimeter of the remote landfill if that slope is greater than 5%.