Airmetrics: Case Studies

Air Quality Assessment Techniques for Roadway Tunnel Projects
Guido Schattanek, Parsons Brinckerhoff Inc.
Ping K Wan, Bechtel Power Corp.

Presented at the 89th Annual AWMA Meeting, June 23-28, 1996

Abstract
The Central Artery/Tunnel (CA/T) Project in Boston, MA, is the largest roadway project underway in the United States. The project is funded by the Federal Highway Administration (FHWA), with construction under the jurisdiction of the Massachusetts Highway Department (MHD), and management and engineering assistance by the Bechtel/Parsons Brinckerhoff joint venture. It includes the construction of thirteen miles of new tunnels within the City of Boston. The tunnel ventilation system as currently designed includes seven ventilation buildings to provide fresh air to the tunnels and to exhaust the mixture of tunnel air and vehicular emissions from cars traveling inside the tunnels. In addition, a less expensive ventilation system using "jet" fans that push air out of the tunnel portals rather than a system employing ventilation buildings is being evaluated to ventilate exit ramps. To comply with Federal, state, and local air quality regulations, an extensive air quality evaluation was performed to assess the impact of vehicular emissions from the ventilation buildings, tunnel portals, and at-grade open roadways which would be affected by the CA/T Project.

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