Massachusetts Department of Transporatation Massachusetts Bay Transporatation Authority
Northern New England Intercity Rail Initiative

Environmental & Design

Draft Supplemental Environmental Impact Report (DSEIR)

MassDOT filed a Draft Supplemental Environmental Impact Report (DSEIR) on January 31, 2018, with the Massachusetts Environmental Policy Act (MEPA) unit. The document describes MassDOT's approach to providing South Coast Rail (SCR) service by extending an existing rail line. The DSEIR outlines MassDOT's phased approach to begin long-awaited commuter rail service in late 2022. You can read more information about the DSEIR in the latest Fact Sheet in English, Spanish, or Portuguese.

How to Comment on the DSEIR:

Send a letter, postcard, or email to the MEPA Office by Friday, March 23, the last day comments are accepted:

Secretary Matthew A. Beaton, EOEEA
Attn: MEPA Office (Purvi Patel)
EEA #14346
100 Cambridge Street, Suite 900
Boston, MA 02114
or fax: 617-626-1181
or via hand delivery

MassDOT would like to receive a copy of your letter, which you can email or mail to:

Jean Fox
Ten Park Plaza, Room 4150
Boston, MA 02116

MassDOT will host two public meetings on the DSEIR. For more information, visit the Community Engagement page.

The DSEIR is available on the Documents Page of this website, by request to Jean Fox by email ( or phone (857-368-8853), and at the following South Coast libraries:

Acushnet Public Library Middleborough Public Library
Ames Free Library (North Easton) Millicent Library (Fairhaven)
Attleboro Public Library Milton Public Library
Berkley Public Library Morrill Memorial Library (Norwood)
Blanding Library (Rehoboth) New Bedford Free Public Library
Boston Public Library – Central Library Norton Public Library
Boyden Library (Foxborough) Raynham Public Library
Canton Public Library Sharon Public Library
Dedham Public Library Somerset Public Library
Dighton Public Library Southworth Library (South Dartmouth)
Fall River Public Library Stoughton Library
Freetown Library (Assonet) Swansea Public Library
James White Memorial Library (East Freetown) Taunton Public Library
Joseph H. Plumb Memorial Library (Rochester) Thayer Public Library (Braintree)
Lakeville Public Library Thomas Crane Public Library (Quincy)
Mansfield Public Library Turner Free Library (Randolph)
Mattapoisett Library West Bridgewater Public Library
Westport Library

Environmental Process History

The US Army Corps of Engineers and MassDOT filed the project's Final Environmental Impact Statement/Report in September 2013. The combined document satisfied state (Massachusetts Environmental Policy Act) and federal (National Environmental Policy Act) requirements. The FEIS/R was a more than 2,000 page in-depth analysis of the project, detailing the preferred alternative, anticipated impacts and proposed mitigation, response to comments, the public engagement process and much more.

The Secretary of Energy and Environmental Affairs issued a Certificate on November 1, 2013. The Certificate states that the preferred alternative “emerged from a robust and detailed alternatives analysis” and notes the extensive stakeholder involvement. It requires additional technical analysis to identify wetland replication/restoration sites and develop detailed mitigation plans to address rare species.

MassDOT filed a Notice of Project Change (NPC) with MEPA in March 2017 to adopt a new phased approach to South Coast Rail service. The NPC provides an overview of proposed changes to the Project that would enable the MBTA to begin service to southeastern Massachusetts on a shorter timeline. The public comment period on the NPC ended in May 2017.

The Secretary of Energy and Environmental Affairs issued a Certificate on the NPC on May 26, 2017. The Certificate outlines the information MassDOT must include in a Draft Supplemental Environmental Impact Report (DSEIR).

The federal process will be completed when the US Army Corps of Engineers issues a Section 404 Permit and Record of Decision (ROD). The ROD is expected to be issued after completion of the wetlands mitigation plan and the final Programmatic Agreement (PA). The PA establishes a process for reviewing cultural resource impacts and mitigation, and approving wetland mitigation plans.

Visit the Documents page for more information on the environmental process, including reports, facts sheets, and more.

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