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What is MTA Vibration Monitoring Protocol about?

The MTA response provided three key points in response to concerns about noise measurements and analysis for the Purple Line project: 1) Noise measurements were taken at two locations adjacent to the Town of Chevy Chase that were determined to be representative sites, yielding day-night noise levels of 59-61 dBA which is consistent with ambient suburban conditions. 2) All noise monitoring equipment was properly calibrated according to certification standards. Noise levels of 50-60 dBA are typical for sub

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Planning Docs

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EN