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

T.F. Green Airport Improvement ProgramEnvironmental Impact Statement and Final Section 4(f) EvaluationTable 4-5Summary of Short-term Roadway Noise MeasurementsSiteNo.DescriptionMeasuredTotal Leq(dBA)MeasuredTraffic-only Leq(dBA)Observed Noise SourcesR1 Senator St., Lincoln Park 54 54 Traffic on Tennessee Ave., birds, distant traffic, start of take-off for aircrafton Runway 23, compressor on commercial property to southR2 Astral St., Hoxsie 51 51 Wind in trees, distant traffic, birds, aircraft on approach to Runway 23R4 Airport Rd. at Harmony Ct., Hoxsie 67 67 Traffic on Airport Rd., aircraft on approach to Runway 23, start oftake-off, reverse thrustR5 Main Ave. at Earl St., Greenwood 73 73 Traffic on Main Ave., aircraft departures from Runway 23R6 Main Ave. at Gladys Ct., Greenwood 75 66 Traffic on Main Ave., aircraft departures from Runway 23R7 Alabama St., Lincoln Park 60 60 Traffic on Post Road, traffic on ramps to and from Route 37R8 Bellevue Ave. at Summit St., Hoxsie 61 55 Traffic on local streets, aircraft on approach to Runway 23Source: HMMH, 2006.Notes: Refer to Figure 4-2 for the location of the noise measurements. Site R3 was removed from the analysis.4.2.2.4 Supplemental Noise MetricsIn addition to DNL, RealContours 163 was used to compute supplemental noise metrics to further describe thenoise exposure characteristics for the Baseline Condition. These supplemental metrics are not required by theFAA, but were conducted in response to agency and public comments received during the scoping process.These metrics provide information that the DNL metric does not, such as the time that a particular locationexperiences noise above a specified level and the maximum noise level at each of the sites.Time-Above (TA) and L maxnoise metrics were modeled for each of the 12 noise measurement sites and allnon-residential noise-sensitive sites within the extents of the modeled radar tracks. Each of the 12 measurementsite locations are described in DEIS Appendix F.5, Noise Monitoring, and shown in Figure 4-2. Table 4-4 presentsthe L maxvalues at these monitoring sites under the Baseline Condition.In general, the highest modeled DNL values would occur at those sites closest to the Airport and most exposedto aircraft operations. Under the Baseline Condition, the modeled DNLs at the noise measurement sites rangefrom a low of 53 dB at Site S6 in Cranston to a high of 69 dB at Sites P1 and P3 in Warwick. Similarly, the highestL maxvalues would occur at those sites closest to the Airport and most exposed to aircraft operations. TheTA-65 dB, 75 dB and 85 dB metrics, L maxmetric, and DNL metric for each of the non-residential noise-sensitivesites are provided in Table F.7-2 of DEIS Appendix F.7, Supplemental Noise Metrics.163 RealContours TM is a pre-processor to the INM used in this analysis. RealContours TM converts radar data into INM input files for modeling allowing themodeling of all reported flights at the airport during the year. Further details can be found in Appendix F, Noise, of this FEIS.Chapter 4 – Affected Environment 4-12 July 2011\\mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_CH04_Affected_Env_JUL_2011.doc