• Specialty

  Air Quality
  Noise / Vibration
  

• SECTOR

  Transportation
  

• TYPE

  Environmental Study
  Permitting / Compliance
  

• CLIENTELE

  Local Government
  State Government
  

• TIMESPAN

  2003-2005

• LOCATION

  Waltham, MA

Route 128/Route 20 Interchange

SERVICE:

Air Quality & Noise Impact Analyses

DESCRIPTION:

A highway project sought changes to the interchange of Route 128/I-95 and Route 20 in Waltham, Massachusetts. Tech Environmental performed air quality and noise impact analyses to evaluate the proposed changes.  A mesoscale analysis of VOC and NO_x emissions was performed that showed lower emissions in the future with the improvements, even with the addition of traffic from a proposed office project.  The FHWA Transportation Noise Model (TNM) was used to show that traffic noise levels on a residential street will decrease as a result of the project.

 

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Key Points

• A highway improvement project faced air quality and noise concerns, and was further complicated by a proposed office project nearby.
• Tech Environmental performed air quality and noise impact analyses and confirmed that impacts would be within applicable standards.