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Noise Management and Public Response 101 Authorities and Responsibilities of Parties Local Government Airport Owner or Operator Aircraft Operators Aircraft Manufacturers Jurisdictions Airport Neighbors May fund and manage None None May require easements as a None, unless an affected easement acquisition programs condition of zoning change or property owner for mitigation of existing uses subdivision approval in areas and lands that are at risk for of elevated noise, or within a incompatible development. designated distance from the If eligible, partial funding is airport required May be an active participant in None None If a change of zoning is None, unless an affected a swap of development rights required, must hear and property owner. If an owner, or facilitator of transfers among approve or deny proposed may negotiate terms after others transfer of development rights being contacted by the from one parcel to another initiating party May fund and manage purchase None None None None, unless an affected assurance programs for property owner. If an owner, mitigation of existing structures. and unable to sell after a If resold, the funds must be designated period of time, returned to the FAA or used for may contact airport to fundable programs. If eligible, negotiate sale partial funding is required May participate in review of None None Collaborates with airport owner May review and comment proposals provided by in review of development through any hearing process development approval agencies proposals or applications for associated with zoning or modification of zoning to building codes incompatible uses within a designated airport environs area residences, schools, churches, nursing homes, hospitals, outdoor amphitheaters, etc. where air- craft fly over activity may substantially impact the conduct of normal activity within those uses. 14 CFR Part 150 provides a detailed matrix of land use compatibility descriptions (147, Appen- dix A, Table 1) used by the FAA to assess how various land uses are affected by aircraft noise. See Table 6-3. Differences within the FAA Divisions Regarding Thresholds of Noise Level Evaluation (60/65 DNL in Airports vs. 45/60/65 DNL in Air Traffic) The FAA, Office of Environment and Energy, has established specific thresholds that are con- sidered acceptable and supported by a preponderance of available scientific evidence. The FAA's Office of Planning and Environment has advised that these levels must be reported in 14 CFR Part 150 and Part 161 reporting, as well as in Environmental Impact Statements. The thresholds state that, for there to be a significant noise impact, there must be noise-sensitive public uses or persons residing within the 65 DNL contour of the annual average condition. When a change in the noise pattern is being environmentally assessed, an increase of 1.5 dB of DNL with a resul- tant DNL of 65 decibels or more constitutes a significant change. Should this situation be pres- ent, any areas exposed to a change of 3.0 dB of DNL or more, resulting in an annual average DNL of 60 dB or more are disclosed as having slight to moderate impacts. The FAA's Air Traffic Organization has accepted these levels and added another for evalua- tions of modifications to flight routes. Should the changes previously cited be present, then any areas exposed to a change of 5.0 dB of DNL, resulting in an average annual DNL of 45 dB or more also is disclosed as having slight to moderate impacts. This reporting criteria is not recognized for application to environmental statements disclosing the effects of changes imposed by airport facility development, but only to modifications of aircraft flight paths. (141)