Borehole Top Preperation

	After the completion of grouting, a 1 ft thick gravel layer is poured at the bottom of each hole.		A sonotube is then placed.
	2 in diameter PVC pipes are extended into each hole to pull sensor cables.		Reinforcements are then placed inside a wooden box.
	Each Borehole is prepared in the same way.		Each box is then filled with concrete.
	After the completion of pouring.		Finished concrete block.
	Insulating the steal enclosers on concrete blocks.		All four boxes are completed.