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

T.F. Green Airport Improvement ProgramEnvironmental Impact Statement and Final Section 4(f) EvaluationTotal emissions of toluene and xylene are expected to occur in the greatest amounts followed by formaldehydeand benzene. This trend is consistent with other findings by the EPA on a nationwide basis. 196 These compoundsare emitted in the exhaust of aircraft, GSE/APUs, and motor vehicle engines and to a lesser extent from boilers,fuel facilities, and other stationary sources.4.6.2.2 Atmospheric Dispersion ModelingThe atmospheric dispersion analysis results for the Baseline Condition at T.F. Green Airport compared to theapplicable NAAQS for CO, NO 2,and PM 10/2.5are summarized in Table 4-23. These reported results (withbackground levels added represent the maximum predicted concentrations (i.e., worst-case conditions).Table 4-232004 Baseline Condition Atmospheric Dispersion Analysis Results for T.F. Green Airport(µg/m 3 )Pollutant Averaging Period NAAQSCO1 hour8-hour40,00010,000MaximumConcentration 1,219,6866,727Exceed NAAQSNO2 Annual 100 45 NoPM10PM2.524-hour24-hour15035Annual1512NoSource: KB Environmental Sciences, Inc. 2008.Notes: CO = Carbon monoxide, NAAQS = National Ambient Air Quality Standards, NO2 = Nitrogen dioxide, PM10/2.5= Particulate matter (10 and 2.5 microns inaerodynamic diameters), and µg/m 3= micrograms per cubic meter.1 See Figure 4-16 for receptor locations.2 Maximum Concentration means highest predicted concentration (except 24-hour PM10 which is the fourth-highest and 24-hour PM2.5 which is theeighth-highest) using EDMS at all of the receptors analyzed with conservatively high background concentrations added.All of the maximum predicted concentrations of CO, NO 2,and PM 10/2.5(with background levels included) at themodeled receptor sites (Figure 4-16) are within the NAAQS for each pollutant and timeframe. The highest levelsare predicted to occur at Receptor 25 G, along Airport Road to the north of Runway 16. This is due to thecombination of emissions from roadway motor vehicle traffic (both airport-related and background traffic) withthe effects from airport-related sources.Ambient levels of Pb and SO 2are generally not affected by operations at commercial airports and therefore arenot assessed with the atmospheric dispersion model, although they are included in the emissions inventory.VOCs are not included in the dispersion modeling because there are no NAAQS to which the results can becompared.3834NoNoNoNo196 Documentation for Aircraft, Commercial Marine Vessel, Locomotive, and other Nonroad Components of the National Emissions Inventory, U.S. EnvironmentalProtection Agency, November 2002.Chapter 4 – Affected Environment 4-38 July 2011\\mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_CH04_Affected_Env_JUL_2011.doc