Finding of No Significant Impact
Finding of No Significant Impact [4.2MB] MassDOT and the MBTA have received full federal environmental approval for the Green Line Extension project. The Federal Transit Administration released a Finding of No Significant Impact (FONSI) for the project, reaffirming the myriad environmental, mobility, economic development, and community-building benefits of the project. Federal environmental clearance is the culmination of several years of technical work done by MassDOT and the MBTA with close cooperation from the Cities of Cambridge, Somerville, and Medford, as well as the participation of hundreds of individuals and local organizations. The FONSI document contains a description of the federal environmental process, mitigation measures proposed for the Green Line Extension project, and an explanation of the public outreach efforts associated with the environmental process.
June 13, 2014 FTA FONSI Response Letter
The links below are the documents relating to the
. These file are large and may take some time to download. Green Line Extension Environmental Assessment If these documents are required in an alternative format, please contact the project staff.
More Environmental Assessment Documents
EPA Brownfield Draft Documents
20 Third Ave - Vehicle Maintenance Facility Site 1
44 to 48 Third Ave - Vehicle Maintenance Facility Site 2
Ball Square Station:
Final Environmental Impact Report
Documents relating to the Green Line Extension Final Environmental Impact Report.
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Draft Environmental Impact Report/Environmental Assessment
All documents relating to the Green Line Extension Draft Environmental Impact Report.
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Public Meeting Presentation - December 14, 2016 [1.4MB]
Public Meeting Presentation - December 7, 2016 [757KB]
Green Line Extension Review Presentation [3MB]
Interim Project Management Team Report: Green Line Extension Project [5.9MB]
GLX Boston Region MPO Presentation - April 28, 2016 [896KB]
Public Meeting Presentation - April 27, 2016 [754KB]
Public Meeting Presentation - April 13, 2016 [2.9MB]
Design Working Group Presentation - March 30, 2016 [1.5MB]
Public Meeting Presentation - March 23, 2016 [1.2MB]
Meeting Presentation - March 2, 2016 [3.5MB]
GLX Contract Presentation for MBTA Fiscal Management Control Board - 08-24-2015
Equivalent Facilitation Request Draft for Review – July 10, 2014 [81KB]
Green Line Extension - Mitigation Ideas for Analysis - Explanatory Memo [190KB]
Green Line Extension - Mitigation Ideas for Analysis [125KB]
Preliminary Engineering Approval Letter – June 11, 2012 [181KB]
Risk Assessment Review Report, August 12 2011 [4.7MB]
Cover Memo [81KB]
Critical Path Schedule [535KB]
Detailed Path Schedule [2.1MB]
Analysis of the Boston Engine Terminal for Co-Location of a Light Rail Maintenance Facility [855KB]
Lechmere Station Agreement Press Release [65KB]
Pan Am Agreement [2.7MB]
About the Project
This section provides basic information about the Green Line Extension Project, including regular project updates, and information on particular topics of interest. This section also includes maps of the project.
More About the Project Documents
Minutes, agendas, and announcements from public meetings and events.
More Public Meetings Documents
Green Line Extension Design Working Group — 2010-Present
Meeting minutes, workshop flyers and notes, and all other documents relating to the Design Working Group.
More Design Working Group 2010-Present Documents
MAPC Mystic Valley Parkway Community Visioning Process
Documents relating to the community visioning process led by MAPC on the potential benefits and impacts of a future Green Line station at Mystic Valley Parkway.
More MAPC Mystic Valley Parkway Community Visioning Process Documents
Vehicle Support Facility Alternatives
Documents on the vehicle support facility analyses.
More Vehicle Support Facility Alternatives Documents
Federal Transit Administration & New Starts
Documents relating to the Federal Transit Administration and the FTA's New Starts funding program.
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Green Line Extension Advisory Group – 2007-2009
All documents relating to the Green Line Extension Advisory Group, which met between October 2007 and February 2009. Documents include meeting minutes, agendas, and presentations.
More Advisory Group – 2007-2009 Documents
"Beyond Lechmere" Northwest Corridor Study Major Investment Analysis
All documents from the foundational study for the Green Line Extension project.
More "Beyond Lechmere" Northwest Corridor Study Major Investment Analysis Documents
Relevant Regulatory Documents
Regulatory documents pertaining to the Green Line Extension project and Massachusetts State Implementation Plan.
More Relevant Regulatory Documents
State legislation relating to the Green Line Extension project.
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Extension of the Somerville Community Path
Documents pertaining to the design of the extension of the Somerville Community Path.
More Somerville Community Path Documents