Geomardy Wins Mumbai Metro Line-11’s Geotechnical Contract

Geomarine Dynamics India Pvt. Ltd. (Geomardy) was today declared as the lowest bidder for conducting geotechnical soil investigation for 18 km Mumbai Metro Line-11 (Green Line) which will connect Anik Bus Depot – SPM Chowk via 15 underground stations.

The alignment of Mumbai Metro’s underground Line-11 was redesigned by Mumbai Metro Rail Corporation Ltd. (MMRC) earlier year. When built, it will be Mumbai city’s third underground line after Line-3 (Aqua Line) & Line-7A (Red Line).

The objective of this geotechnical investigation is to have sufficient data on the sub-soil to assist with preparing detailed design of structures, and use appropriate machinery, methods & technology during construction. This will also help ensure least possible damage to existing structures during the construction phase.

MMRC had invited bids for this contract in early August with a 90 day deadline and an estimate of around Rs. 1.52 crore. Technical bids were opened by MMRC in August-end to reveal 11 bidders out of which 4 firms did not qualify.

Financial Bid Values

Firm	Bid (Rs. Crore)
Geomarine Dynamics India	1.21
Genstru Consultants	1.43
S & R Geotechniques	1.47
CEG Test House And Research Centre	1.63
Pureways Infra	1.67
Monarch Surveyors & Engineering Consultants	1.82
Myrtle Project And Consultancy	1.97

MMRC’s Brief Scope: Geotechnical Investigation works for revised alignment of Mumbai Metro Line 11

Here’s a copy of Line-11’s revised alignment. 15 underground stations are planned to be built at Anik Bus Depot, Wadala Depot, CGS Colony, Ganesh Nagar, BPT Hospital, Sewri, Hay Bunder, Coal Bunder (Darukhana), Reay Road, Byculla, Nagpada Junction, Bhendi Bazaar, Crawford Market, CSMT Metro (interchange with Line-3 / Aqua Line), Horniman Circle, and SPM Circle.

Geomardy’s bid of Rs. 1.21 crore was 20% below MMRC’s estimate of Rs. 1.50 crore, so a contract should be awarded in the coming weeks without a long financial bid evaluation period. That said, in Q1 2025 we should start seeing their barricaded work sites with investigation tripods along the line’s alignment.

Per MMRC’s tender notice, boreholes of 150mm for geotechnical investigation should be spaced at regular intervals of 500 meters along the twin tunnel’s alignment with 3 boreholes required at each station’s site area. These boreholes will be dug up to a depth of 10m, between 10-20m, and beyond 20m per the consultant borehole plan.

If and when awarded, Geomardy will need to submit the following in their final report:

• Bore hole details and locations with georeferenced co-ordinates.
• Area geology and related characteristics
• Water table levels
• Test results
• Bore hole wise foundation recommendations
• Cutoff value
• Soil bearing capacities
• Seismicity

As shared in the past, this investigation is one of the several steps MMRC has to take prior to construction which I envision will not start until at least 2027 – and that’s on the optimistic side of the spectrum.

Other necessary steps including securing financing, preparing detailed designs, appointing a General Consultant, appointing consultants for EIA, SIA & rehabilitation, and conducting the civil tendering process.

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– TMRG