Massachusetts Bay Transportation Authority (MBTA) Massachusetts Department of Transportation
Green Line Extension Green Line Extension
GLX Construction


Upcoming Construction Activity - April 16 – 27, 2018

For inquiries relating to Green Line Extension construction work please use our Construction Hotline - 1-855-GLX-INFO (459-4636) - 24/7 Coverage. For all other Green Line Extension inquiries please contact the project at

Clearing and Grubbing (tree & brush clearing + stump & trash removal)

TARGET START: End of April

Purpose of Work: Expand the usable space in the right-of-way (ROW) while creating a safe work zone for GLX construction and future train operations.

Approach: Clearing will start north of the College Avenue Bridge (on east side of alignment) beginning late April/early May and progress down to Lechmere Station. Proactive pest control measures are underway in advance of this work (see below).

Duration: First phase - approximately 30 – 60 days

Impacts: All work will be conducted in the ROW. Some noise impacts will result from chainsaws and vehicles hauling away debris. There will be visual impacts in some areas due to loss of trees. Weekdays 10 a.m. to 3:30 p.m. Weekend work is expected.

Benefits: At least 90 percent of wood will be recycled, repurposed, or used for lumber. The pest habitat will be greatly reduced.

Areas impacted in next two weeks: None. See next update for dates and details on impacted areas.

Pre-Construction Survey

TARGET START: Week of April 16

Purpose of Work: Capture conditions of homes and businesses along the alignment to ensure no adverse structural impacts are caused by construction.

Approach: Document conditions in the ROW first, beginning April 16. In late April/early May begin notifying homeowners and requesting access to their properties (inside & out) to perform visual, video, and photographic survey of structures. Notification process will be ongoing throughout 2018. Like the tree clearing work, the survey will start on the east side of alignment and will progress from north to south.

Duration: Surveys will take approximately one hour to complete per property. Work will continue throughout 2018.

Impacts: Some time involved on the part of homeowners to allow for property access and coordination, etc.

Benefits: Homeowners will receive a report of the survey results. This operation will help to ensure that any potential impacts to properties from construction are captured.

Areas impacted in next two weeks: Homeowners on the east side of the MBTA right of way will start to receive certified letters from the subcontractor.

Pest Control

TARGET START: Work underway

Purpose of Work: Reduce chances of displacing rodents from ROW into abutting neighborhoods.

Approach: A rodent survey on the ROW has been completed to determine effective Pest Management Plan. Baiting is currently underway.

Duration: Work will continue throughout 2018 and for the duration of the project. Contractor will be out on the project weekly.

Impacts: The goal is to reduce the number of rodents and their habitats. Subcontractor will closely monitor this work to minimize impacts in adjacent areas.

Benefits: Construction team is working with the cities of Somerville, Medford, and Cambridge to coordinate and maximize the effectiveness of GLX and municipal pest control efforts.

Areas impacted in next two weeks: No direct impacts but bait stations could be visible to those looking into the ROW.

Soil Boring & Utility Investigation

TARGET START: Work underway

Purpose of Work: Determine soil and rock quality to support design efforts. Confirm that engineered drawings and actual utility locations match to avoid possible service interruptions during construction.

Approach: Handful of crews with boring and other earth moving equipment are methodically moving operations along the entire GLX construction corridor.

Duration: On-going through Summer of 2018.

Impacts: Minimal.

Benefits: Reduce utility disruptions in the affected areas.

Areas impacted in next two weeks: Various locations throughout the MBTA right of way and adjacent areas.

Pre-Construction Sound Monitoring

TARGET START: Work underway

Purpose of Work: Record baseline noise levels on and off the ROW prior to construction start.

Approach: Install sound monitors to track decibel levels throughout day and night.

Duration: Several weeks.

Impacts: Sound monitoring impacts are generally not noticeable.

Benefits: Sound monitoring allows the project to develop plans to minimize noise during construction.

Areas impacted in next two weeks: Neighborhoods along the MBTA right of way may see crews with monitoring devices.

Emergency Contact Info


For emergencies relating to Green Line Extension construction work please use our
Emergency Construction Hotline - 1-855-GLX-INFO (459-4636) - 24/7 Coverage

For all other Green Line Extension inquiries please contact the project at

Progress Photos


Construction Progress Photos on Flickr

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