Private letter U wall segment in the segment down the slope into the Depot Foundation pit digging remedies originally dug the ceiling. However, in practice the construction of bored piles at the PDA ngiệm laboratory here, contractors found digging areas appear from either side of the flow into the sand and carry avalanche pits dug. So the contractor has established measures and conduct observation of this area water tracking, the highest water levels of up to + 6.33 (the bottom of the pedestal is + 5,192) is higher than the bottom of the nail hole 1,138 m. With the water level in Foundation pit construction measures, like on the train was not able to perform, so the proposed contractor switched to training measures have laid siege to frame ensures safe for walls, digging holes and construction schedule proposed (table to track the water level see annex 5).
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