PORTFOLIO › Acoustics > Environmental

LOCATION: Washington, D.C.
PROJECT TYPE: Noise Analysis
CLIENT: Phase I: District of Columbia, Phase II: Department of Energy and Environment
CONSTRUCTION YEAR: Phase I: 2017, Phase II: 2018

Phase I – As a consultant, the team led by Freytag & Associates, performed an airplane noise assessment for the District of Columbia focused on noise impacts from changes to flight paths made out Ronald Reagan Washington National Airport (DCA). There were two major parts to the project. The first consisted of a thorough review and documentation of existing data supplemented by new investigations to document the past and current airplane noise environment over the D.C. area. Second, the team worked to develop revised air traffic procedures, acceptable to the FAA, to minimize the current noise impact over the affected areas in D.C. The overall purpose of the project was to determine what, if any, noise impacts have occurred in the District as a result of the FAA’s implementation of NextGen air traffic control procedures and routes. Finally, we identified potential flight path/route changes and other airspace modifications to reduce flyover noise in the District.

Phase II – This phase builds on the previous Phase I study. Utilizing the measurement data collected in Phase I, the consultant team will compute various supplemental noise metrics (Lmax, Leq, Time Above Level, etc.) identified by the U.S. Department of Defense (DOD) Noise Working Group to further quantify noise impacts and changes in aircraft noise due to arrivals and departures at Ronald Reagan Washington National Airport (DCA). Additional long term field measurements will also be conducted. Specifically, the results of the analysis will compute the change in noise exposure due to airspace modifications made from the Next Generation Air Transportation System (NextGen) initiative. The consultant team will also quantify the community impacts (e.g., sleep disturbance, speech interference) according to national standards. Additionally, we will identify and encourage improvements and changes to existing noise abatement procedures and practices to reduce aircraft noise impact over the District. Specific noise mitigation recommendations will be developed for presentation to airport management, the Metropolitan Washington Airport Authority (MWAA), and to the Federal Aviation Administration (FAA). The primary beneficiary of this project will be the District residents, as the goal of the project is to reduce DCA aircraft noise impacts and improve residents’ quality of life through aircraft noise reduction. The estimated date for this project is by September 2018.