Aircraft Noise mapping from Cultural data

The FAA has released a portion of the noise impact results used in the Environmental Assessment. The data is on cultural resources identified by the Department of Transportation as potentially having noise sensitivity. It’s mostly parks, wildlife refuges, open spaces and historic sites – it’s called 4(f) data. The FAA also used modeled census block …

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CNEL should be used instead of DNL in CA

CNEL is the California metric used to measure noise annoyances. The FAA is using the wrong noise metric to describe aircraft noise in the Draft Environmental Assessment (EA). California’s differing cultural and environmental noise threshold expectations are reflected in the State’s mandate to use the Community Noise Equivalent Level (CNEL) metric for assessing airport noise …

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EA fails on Federally identified Noise Sensitive areas

The EA’s Noise Criteria fails when considering Section 4(f) properties and resources. Special consideration, such as cumulative impacts, needs to be given to noise changes in sensitive areas. An Environmental Impact Statement (EIS) may be warranted to discuss noise impacts on sensitive sites. The EA’s Noise Criteria doesn’t apply to Sensitive Areas. FAA Order 1050.1E …

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Ambient Noise Levels should be considered in Noise Criteria

The Noise Criteria Threshold is too high above ambient Noise Levels. The threshold needs to factor in aircraft’s noise contribution to ambient noise levels. The EA presents aircraft noise and only considers noises above DNL 45 dB as relevant to the Noise Criteria. The Noise Criteria should include existing neighborhood ambient noise levels as a baseline to compare …

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Noise Impacts by Population needed

A discussion with a friend at Boston West Fair Skies makes me realize one of the areas that is missing from our EA is noise impact by population. The Boston population analysis is very impressive- and it’s only for one RNAV SID (Departure) Runway. After having mapped the DOT 4(f) noise data I perform an …

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Formal Request for all Results from Noise Modeling

Modeled Noise Data results are incomplete in the Draft Environmental Assessment. The 4(f) noise data included with the EA has some interesting features, and shows trends, but its random site distribution is problematic to larger generalizations about population impacts. We need a more thorough release of the noise data. ##### Subject: Request Full Results from …

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