The statement comes a day after Congress demanded sacking of Union Minister Nitin Gadkari, alleging that the award was a "clear case of corruption at the highest level".
"Ministry of Road Transport & Highways follows due procedure while maintaining complete transparency in the award of any contracts. In the instant case also the contract was awarded after due diligence after the bid was found technically responsive. Financial bid was opened and the quoted Semi Annuity amount found in line with the approval of CCEA for award of the work," an official statement said.
"E-Tendering process was adopted for award of Zojila Tunnel contract with the mode of BOT and concession period of 22 years including 7 years construction period," it added.
It said bids for the tunnel were invited first in April 2013 but had to be cancelled at technical stage only due to "single tender", and fresh tenders were floated but had to be cancelled in the financial stage due to single tender again.
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"Considering the geographical & strategic location of the project, a wider publication through newspapers and through Ministry of External Affairs to foreign countries, Indian Road Congress, International Association of Bridge & Structural Engineers, Ministry of Railways was adopted," it said.
However, the statement added that despite sufficient time of over 90 days from July 30 to November 2, 2015 only one bidder participated which had to be cancelled again as per the rule that single tender received in "first call shall be cancelled without opening the bid and the tender shall be re-invited".
Congress General Secretary Digvijay Singh yesterday alleged that Gadkari, Minister of Road Transport and Highways, violated the CVC guidelines while awarding the contract.
Gadkari has rubbished the charges of corruption, saying that Singh's allegations were "completely false" as the ministry followed a transparent e-tender system.