TagNoise Boundary(5)

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  • 2022-10-23 00:48

    X 2 – Nem Plot Future (2018) Nem Ncp

  • 2020-09-23 00:00

    Congressional Quiet Skies Caucus Letter To FAA Administrator Steve Dickson re DNL65

    Currently, FAA law has extremely complicated rules for establishing a noise boundary around airports. (A noise boundary is a geographic area inside which there is a certain acceptable noise level.) This is referred to as the DNL65. and it has several major flaws. The FAA Reauthorization Act Of 2018 attempted to address these flaws in several ways. This letter, from a caucus of Congressmen engaged on airport community issues complains to the Administrator that the spirit of the law is not being adhered to and demands that he make attempts to put his agency into compliance. The language is fairly technical, however there are a couple of basic points they raise: First, that the noise boundary be determined by actual noise measurements (currently the noise boundaries are 'modeled' and those calculations often do not reflect in any way the lived experience for residents.) Second, that the 'acceptable' noise level of sixty five decibels (hence DNL65) has been determined to be far too high to conform with current understandings of healthy living.
  • 2019-02-19 11:43

    DNL65 For Dummies

    There is a geographic area around every large airport where, according to a formula developed by the Federal Aviation Administration (FAA), the ‘noise’ level is equal to or greater than 65 decibels DNL (Day Night Level). That area is depicted on a noise exposure map (NEM) and referred to as the Noise Boundary or just
  • 2018-07-31 21:22

    Part 150 Study 2013 vs 2018 NEM Comparison

    !Existing (2013) Baseline Compared to Future (2018) Baseline Noise Exposure Contour Exhibit:3-16 ± ! ! ! Airport Property Boundary Municipal Boundary Hospitalv Churchæ Schooln Water Nursing Home× Libraryc Existing Land Use Single-Family Residential Two-Family Residential Multi-Family Residential Agriculture/Open Space Park/Recreation Institutional Commercial/Industrial Mobile Home Park Future (2018) Baseline Noise Exposure Contour Existing (2013) Baseline Noise Exposure Contour Study Area PUGET SOUND CONTOUR BAND CONTOUR AREA (SQUARE MILES) HOUSING UNITS ESTIMATED POPULATION NOISE SENSITIVE FACILITIES DNL 65-70 dBA 4.4 3,771 9,712 9 DNL 70-75 dBA 1.8 0 0 0 DNL 75+ dBA 1.1 0 0 0 DNL 65+ dBA 7.3 3,771 9,712 9 FUTURE (2018) BASELINE NOISE EXPOSURE CONTOUR CONTOUR BAND CONTOUR AREA (SQUARE MILES) HOUSING UNITS ESTIMATED POPULATION NOISE SENSITIVE FACILITIES DNL 65-70 dBA 3.7 1,887 4,879 9 DNL 70-75 dBA 1.3 0 0 0 DNL 75+ dBA 0.9 0 0 0 DNL 65+ dBA 5.9 1,887 4,879 9 EXISTING (2013) BASELINE NOISE EXPOSURE CONTOUR DNL 65 dBA ! FINAL 5/30/2013 Prepared by Landrum & Brown Filename: P:SEAPart 150 Update - 2009GIS MXDExhibitsDocument3-16_Existing_Baseline_ vs_Future_2018_Baseline.mxd Contours: SEA2013Noise-Contours/SEA2018Noise-Contours
  • 1981-11-01 00:00

    Forecasted Noise Contour Map, 1980–2000

    From the 1981 Noise Exposure Update