T.F. Green Airport Improvement Program - FEIS Chapters - PVD

T.F. Green Airport Improvement ProgramEnvironmental Impact Statement and Final Section 4(f) Evaluation5.3.8.1 Significant ImpactsTable 5-31 summarizes the population and housing units that would be exposed to a significant noise impactand, therefore, would be eligible for sound insulation mitigation, as a result of Alternatives B2 and B4.Table 5-31 Alternatives B2 and B4: Summary of Significant Impacts on Housing Units and Population 1,22015 Population and Housing 2020 Population and Housing 2025 Population and Housing Units by DNL value Units by DNL value Units by DNL value (Increase of at least DNL 1.5 dB at (Increase of at least DNL 1.5 dB at (Increase of at least DNL 1.5 dB ator above DNL 65 dB) or above DNL 65 dB) or above DNL 65 dB)Type Alt. B2 Alt. B4 Alt. B2 Alt. B4 Alt. B2 Alt. B4Housing Units -- 3 184 74 174 49 108Population -- 3 432 174 409 115 254Already Sound Insulated Under a Previous Sound Insulation Effort (Part 150 NCP)Housing Units 0 161 74 151 49 87Population 0 378 174 355 115 204Project-related Mitigation for Significant Noise ImpactsNon-Insulated Significantly Impacted NA 23 0 23 0 21Housing UnitsNon-Insulated Non-Residential Noise- NA 1 0 1 0 1Sensitive SitesSource: HMMH, 2011. U.S. Census Data, 2000.Note: Represents the number of housing units and non-residential noise-sensitive sites affected by significant noise levels during a specific year and are not cumulative.Impact numbers include homes already sound insulated. The actual number of homes required to be eligible for sound insulation would be the difference between theBuild Alternative impact and the number of previously sound insulated homes. Refer to Chapter 6, Mitigation for Alternative B4 for the actual number of homes eligiblefor sound insulation.1 Significant impacts are noise impacts that occur if analysis shows that the project would cause noise-sensitive areas to experience an increase of at least DNL 1.5 dB at orabove DNL 65 dB noise exposure when compared to the No-Action Alternative for the same timeframe. These residences would be eligible for sound insulation mitigation.2 Excludes people that would be relocated and housing units that would be acquired for construction, noise mitigation under a Future Build VLAP, and RPZ area clearing.3 Alternative B2 in 2015 is based only on runway safety enhancements with no changes in aircraft operations and, therefore, did not result in project-related significant noise impacts.In 2015, Alternative B2 would not result in significant noise impacts. Alternative B4 would result in a significantnoise increase to 184 housing units (an estimated 432 people) and none would experience a slight to moderateincrease. Alternative B4 would also expose two non-residential noise-sensitive sites, Jehovah’s Witnesses ofWarwick (Site PW017) and Baha’i Faith (Site PW039), to a significant noise impact in 2015 that would makethem eligible for sound insulation; however, Baha’i Faith has been sound insulated as part of a previous soundinsulation effort under the Part 150 NCP.In 2020, Alternative B2 would result in a significant increase noise exposure for 74 housing units (an estimated174 people), all units of which have already been sound insulated, and Alternative B4 would result in asignificant increase in noise exposure for 174 housing units (an estimated 409 people), all but 23 of which havealready been sound insulated (Table 5-31). The primary reason for the greater noise impacts under Alternative B4compared to Alternative B2 is that over 100 housing units impacted by noise under Alternative B4 would be acquiredfor construction purposes under Alternative B2. These include units that would be impacted by activities such asconstructing the Runway 23 End RPZ, which would not be cleared under Alternative B4 since no changes would bemade at the Runway 23 End. 289 No noise-sensitive sites would experience a slight to moderate increase for289 Clearing the Runway 23 RPZ under Alternative B2 would result in 74 residential units being eligible for acquisition at the Runway 23 End.Chapter 5 - Environmental Consequences 5-43 July 2011\\mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_CH05_Environmental_Cons_JUL_2011.doc