активный слой(In environments containing permafrost, the active layer is the top layer of soil that thaws during the summer and freezes again during the autumn.: Permafrost is soil, rock or sediment that is frozen for more than two consecutive years. In areas not overlain by ice, it exists beneath a layer of soil, rock or sediment, which freezes and thaws annually and is called the "active layer"wikipedia.org)
изолирующий слой(укладка слоя грунта во время эксплуатации полигона между отходами, а так же изолирующий слой в процессе рекультивации полигона отходов 4semakin)
