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MBTA Green Line Extension Planning & Design

HMMH has been providing noise and vibration services to the Massachusetts Bay Transportation Authority (MBTA) since 1983 working on a wide variety of bus, light rail, heavy rail and commuter rail transit projects. For the $2 billion Green Line Extension Project, HMMH conducted noise and vibration measurements throughout the study area, performed detailed noise and vibration impact assessments, prepared technical documentation, specified noise and vibration mitigation and has had significant involvement in the public outreach for the Project, attending numerous public hearings and meetings with key stakeholders. The project traverses one of the most densely populated cities in the United States, which makes construction noise and vibration an important factor for the Project.

During preliminary engineering, HMMH advanced the mitigation designs and provided detailed construction noise and vibration impact and mitigation plans and specifications for inclusion into the final design and contract documents for a Construction Manager/General Contractor-led project. When the project ran into financial issues, a 90-day review was conducted with regard to project scope and budget. During that process, HMMH assisted in the re-evaluation of the required mitigation and the most cost-effective approach to fulfilling the mitigation commitments.  At the conclusion of the 90-day review, HMMH supported the MBTA in the development of technical provisions and specifications for the procurement of a new design/build team.

Most recently, HMMH is providing oversight and review of contractor designs and analysis to mitigate operational and construction noise and vibration and leading management of the project’s sound insulation program. HMMH also supported the development of a revised financial plan to support the Federal Transit Administration New Starts Program Full Funding Grant Agreement.

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