With the benefits of the progress and quality of the above, the contractor recommends You Ban and supervising reviewed, approved the use of circular reinforced concrete culvert under the design of scientific and technological Institute of TRANSPORT (Specialized Institute Bridge-Tunnel) for packages CW3A and CW4A. Bidders would pledge new lock type price mentioned above is not greater than the cost of this kind of tribute by the original design, while still ensuring adequate bearing capacity criteria and intensity of concrete drain in accordance with the specifications of the project.
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