In the process of construction of pile sections down the slope into the Title, supersonic duct and drill Pô core of piles of clogged 28 should not be core drills, ultrasonic experiments. So the pile of 28 in the lower slope segment on Topical Pô did not ensure the conditions for work of a normal deposit and therefore is considered broken pile (please reference the minutes do not comply with the number 7, code CP01-NCR-0007, opened on 07/02/2015 in the attached document). To ensure the normal work of the lower slope segment structure in Titles, Daelim contractor Pô has proposed additional piles design (28a) the calculations to verify the need, expressed in the document presentation designed to change the structure of the lower slope segment on Topical Pô caused by flaws in love too bored piles construction of 28 reference code, DLM-IMP-TRE-WVO-J01-30242-E/V. Calculation results to verify the proposed method shows already meets the technical requirements such as the durability and stability of the construction.This design change will give rise to costs involved. Total volume increase due to design changes that will totally do the contractor responsible. Details of the volume change will be specified in the design drawings of construction related.So, with this letter, we recommend the Board approve the quarter glass design changes for clearing piles of 28 in the lower slope Segment on Topical Pô.Sincerely,
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