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

T.F. Green Airport Improvement ProgramEnvironmental Impact Statement and Final Section 4(f) Evaluationsensitive sites would be sound insulated as noise mitigation. Assuming that FAA funding is made available,RIAC would begin the sound insulation program following the last phase of project-related land acquisitionmitigation.Table 6-6Alternative B4: Residential Units Newly Eligible for Participation in a Future SoundInsulation Program for Noise Mitigation under Part 150 1Analysis YearResidential Units SoundResidential Units Exposed to Insulated as part of a PreviousSound Levels between DNL Sound Insulation Effort Under65 dB and 69 dB 1 Part 150 NCP 1Remaining Residential UnitsNewly Eligible for VoluntaryParticipation in a FutureSound Insulation Program 12015 959 877 82 220202025Source:Note:121,1201,400RIGIS: Field verification by VHB, Inc., 2005; City of Warwick Assessor’s Parcel Data.Represents the number of housing units affected by noise during a specific year and are not cumulati ve.Incl udes homes exposed to noise levels up to DNL 69.9 dB. Totals include all eligible properties within the DNL 65 dB contour only, excluding Project-related acquisiti ons.As noted, the numbers presented are not cumulative. Through 2025, a total of 324 housing units would be newly eligible for Project-related noise mitigation(sound insulation) due to significant noise impacts (82 units in 2015, 75 additional units i n 2020, and 167 additi onal units i n 2025).6.2.4.4 Install Noise Barriers or Berms on Main AvenueIn accordance with RIDOT criteria for vehicular traffic noise, the feasibility of constructing noise barriers orberms has been examined and consideration will be provided wherever vehicular traffic noise impact isexpected to occur as a result of the proposed road changes. Preliminary results indicate that noise barriers orberms appear to be feasible at six locations along Realigned Main Avenue under Alternative B4 (Figure 6-1).Table 6-7 describes and locates these feasible barriers, and provides preliminary data for the barriers includingtheir physical size, insertion loss (noise reduction), total cost, and cost per protected home. Barriers 2 and 4 ofthe DEIS Level 6 noise analysis required revision as part of this FEIS because Barrier 2 and one section ofBarrier 4 are no longer feasible. The DEIS Level 6 Barrier 2 was eliminated and, therefore, the remaining barriershave been re-numbered for this FEIS. The remaining section of Barrier 4 between Morse and Palace Avenueswas still able to be designed cost-effectively. Also, since the DEIS, it has been determined that the DEIS Barrier 5(now Barrier 4) is not in the protected airspace. The portion of Barrier 4 that is located in the RPZ would mostlikely be constructed as a berm.9631,076157 2324 2At five of the locations, the preliminary noise barrier/berm designs appear to meet RIDOT’s Cost EffectivenessIndex (CEI) of $2,500/dBA(IL)/unit or $25,000/unit. As described above, all noise barriers/berms identified asreasonable and feasible may be included in the project plans and specifications as appropriate followingRIDOT’s protocol. As part of the RIDOT process, homeowners would be consulted after the ROD has beenissued and as part of the design process. Seventy-five percent of the abutters would need to agree to constructthe noise barrier. Barriers not agreed to by the abutters would not be carried through for additional design.Barriers that are carried through for additional design will also need to be shown not to conflict with line-ofsightat intersections or conflict with underground utilities.Chapter 6 – Mitigation 6-14 July 2011\\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_CH06_Mitigation_JUL_2011.doc