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

T.F. Green Airport Improvement ProgramEnvironmental Impact Statement and Final Section 4(f) EvaluationAccording to the current SIP for the Rhode Island Ozone Non-Attainment Area, the area-wide totals of VOCand NO Xare 10,540 and 1,553 tons, respectively. Operational emissions resulting from Alternatives B2 and B4are approximately one and three percent, respectively, of the area-wide totals for these pollutants. Theseemissions are less than 10 percent of state-wide totals and are not considered to be regionally significant.Construction EmissionsFrom the inventory of construction emissions presented previously for Alternatives B2 and B4, the maximumannual emissions of NO Xand VOC are summarized in Table 5-90 and, for comparative purposes, the applicableGeneral Conformity Rule de minimis levels are also provided. From this comparison, “yes/no” statements as towhether the emissions meet the Presumed-to-Conform criteria are given.Table 5-90Construction Emissions General Conformity Summaries 1 (tpy)De minimis 2015 Phase 2020 PhasePollutant Levels 2 Alternative B2 Alternative B4 Alternative B2 Alternative B4VOC 50 4.4 4 3.8 4 3.8 5 3.9 5NOX 100 49.5 4 38.3 4 19.4 5 31.6 5Conforms to the SIP? 3 Yes Yes Yes YesSource: KB Environmental Sciences, Inc., 2011.NOX Nitrogen oxides.VOC Volatile organic compounds.1 Values shown are based on year of greatest construction-related emissions, by phase.2 De minimis levels are thresholds below which the program-related emissions are “presumed to conform” to the SIP. 3 Conforms to the SIP determinations (i.e., Yes/No) are based on whether or not construction-related emissions (tpy) are less than de minimis levels (tpy). 4 The results shown are for the year 2013 (Alternative B2) and year 2014 (Alternative B4); the year of greatest emissions in the 2015 timeframe.5 The results shown are for the year 2020 (Alternative B2), and year 2016 (Alternative B4); the year of greatest emissions in the 2020 timeframe.Table 5-90 demonstrates that construction-related emissions associated with Alternatives B2 and B4 are withinthe de minimis levels. Therefore, these emissions automatically conform to the SIP and no formal GeneralConformity Determination is required.Operational and Construction Emissions CombinedDuring the second development phase (the “2020 Phase”) of the T.F. Green Airport Improvement Program, project-related construction emissions of NO Xand VOC would occur concurrently with program-related operational emissions in the years 2015 to 2020. During this period, these construction- and operational-related emissions are “additive” under the General Conformity Rule and must be considered together. Table 5-91presents a compilation of these emissions broken out by category and year; the combined sums; and then compares these values to the applicable de minimis levels. Again, “yes/no” statements as to whether theemissions conform to the SIP criteria are given.As shown, the combined totals of construction- and operational-related emissions associated withAlternatives B2 and B4 are below de minimis levels, and the Improvement Program is not regionally significant.Therefore, these emissions conform to the SIP and no formal General Conformity Determination is required. Chapter 5 - Environmental Consequences 5-166 July 2011\\mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_CH05_Environmental_Cons_JUL_2011.doc