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

T.F. Green Airport Improvement ProgramEnvironmental Impact Statement and Final Section 4(f) Evaluation4.6.2.3 CO “Hot-Spot” AnalysesThe results of the CO “hot-spot” modeling for the Baseline Condition are summarized in Table 4-24 andrepresent the highest CO levels at any of the roadway receptors analyzed. Refer to Figure 4-17 for the locationsof the intersections evaluated. As shown, CO levels in the vicinities of the intersections analyzed are notexpected to exceed the NAAQS for CO under baseline conditions.Table 4-24 Baseline Condition CO “Hot-Spot” Analysis Results 1,2,3 (µg/m 3 )Maximum ConcentrationID 1 Intersection Location 1 1-Hour 8-Hour Exceed NAAQS13456Post Road / Lincoln AvenueWarwick Avenue / Airport RoadPost Road / Airport RoadPost Road / Airport ConnectorPost Road / Main Avenue20,70021,30020,60018,90020,4009,3009,7009,2008,0009,100NoNoNoNoNoNAAQS for CO 40,000 10,000Source: KB Environmental Sciences, Inc. 2008.Notes: CO = Carbon monoxide, NAAQS = National Ambient Air Quality Standard.1 See Figure 4-17 for intersection locations. Intersection 2 (Warwick Avenue/Airport Road (Relocated) is not included in this table as it is designated for future year conditions.2 Receptors are about 3 meters (10 feet) from roadway edge-of-pavement and the reported results are the highest CO concentrations at all receptors analyzed.3 Includes 1-hour background CO concentration of 14,000 µg/m 3 and 8-hour background concentration of 4,000 µg/m 3 . 4.6.2.4 Air Monitoring DataAir quality monitoring data in the vicinity of the Airport are available from three sources: the RIDEMPermanent Air Quality Monitoring Stations, the RIDEM Temporary Air Monitoring Study; and the RIACPermanent Air Quality Monitoring Program.RIDEM Permanent Monitoring StationsRIDEM operates eight permanent ambient air quality monitoring stations throughout the state as part of itsongoing air monitoring program. These stations sample and record outdoor levels of the criteria air pollutants andseveral of the HAPs discussed previously. Results are summarized in Table 4-25. As shown on Figure 4-18, theclosest state air monitoring stations to the Airport are approximately 6 to 9 miles to the north and are located in, ornear, downtown Providence. No permanent RIDEM air monitoring stations are presently located directly on, oradjacent to, the Airport. RIDEM collected air monitoring data from around the Airport in 2005 and 2006, and RIACinstalled a permanent air monitoring system in 2008.Chapter 4 – Affected Environment 4-39 July 2011\\mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_CH04_Affected_Env_JUL_2011.doc