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Project Experience: I-495 Environmental Impact Statement, Virginia

The Challenge

A highly complex noise analysis was needed for the proposed widening of a 14-mile section of the Capital Beltway in Virginia.

The Strategy

HMMH’s study successfully satisfied all federal and state requirements. The complexities of the study included:

  • Five multi-lane Build alternatives, each with several interchange options
  • Removal of eleven existing noise barriers
  • 4000 to over 5000 residential impacts per alternative
  • 20 to 25 miles of noise barrier evaluated for each alternative
  • Traffic Noise Modeling (TNM) of all areas, including complex multi-level interchanges at I-66 and Dulles Toll Road