Last month, Mumbai Metro Rail Corporation (MMRC), which is developing the project on an engineering, procurement and construction (EPC) model, had invited tenders worth Rs 129.32 crore for the civil work at the metro car depot at Aarey Colony in Goregaon.
"We have already invited bids for the depot work and it is in the final stages. Later, in December, we will invite tenders for tunneling," MMRDA additional metropolitan commissioner Sanjay Sethi told reporters on the sidelines of the ground-breaking ceremony.
The government has signed a loan agreement with Japanese funding agency JICA which will provide nearly 57 percent of the total cost of the project or Rs 13,235 crore.
The Centre and the state will equally contribute for the remaining cost of the project, out of which Rs 777 crore will be borne by the Mumbai International Airport, since the metro will pass through the airport areas.
All barring one of the 27 stations of the metro will be underground. The one at the Aarey Colony, Goregaon on the northern fringe of the city will be at the ground level.
The corridor is expected to be completed by FY20 and is estimated to carry 13.9 lakh commuters daily by 2021 and 17 lakh by 2031.
The 27 stations on the corridor are Cuffe Parade, Vidhan Bhavan, Churchgate, Hutatma Chowk (Fountain), CST, Kalbadevi, Girgaon, Grant Road, Mumbai Central, Mahalaxmi, Science Museum, Acharya Atre Chowk, Worli, Siddhi Vinayak, Dadar, Shitaladevi Temple, Dharavi, BKC, Vidya Nagari, Santa Cruz, Domestic Airport, Sahar Road, International Airport, Marol Naka, MIDC, Seepz and Goregaon.
The MMRDA is also planning a 40-km metro line on the Dahisar-Bandra-Mankhurd sector with an estimated cost of Rs 30,000 crore.

Addressing the gathering in the presence of Union Urban Development Minister Venkaiah Naidu, Chavan said, "We have undertaken a number of projects that will make Mumbai an international city. So we want the Centre to provide us all the necessary assistance including funds for such large size projects."
He said the Centre should consider setting up the proposed third School of Planning and Architecture in the state.
"We have taken up a number of projects. But the problem is availability of trained architects and planners. Since the Centre is planning to set up a third school of planning and architecture, we would request the government to consider Maharashtra for this," Chavan said.
He also asked Naidu to give clearance for the proposed coastal road project and Chhatrapati Shivaji statue that will come up in the Arabian Sea off Mumbai shore.
Naidu said the Centre is ready to provide all the assistance to the state.
"If the government comes to us with any developmental proposal, we will ensure that the projects are approved as fast as possible. We have to work as team India. We are using public money and so we will have to work together to provide them basic facilities," he said.
Naidu added that the state's proposals of rainwater harvesting, recycling of water and desalination of sea water are also under consideration along with many infra projects for the city.

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