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

T.F. Green Airport Improvement ProgramEnvironmental Impact Statement and Final Section 4(f) EvaluationFully Relocated Airport RoadUnder Alternative B2, Airport Road would be fully relocated north of its present location impacting approximately1.8 acres of federal-regulated vegetated wetland and 2.4 acres of state-regulated perimeter and riverbank wetland(Figure 5-39). Most of the impact to federal-regulated vegetated wetland (1.1 acres) would occur in Wetland A2,which provides wetland wildlife habitat as a principal function and Wetland I (0.5 acres), which receivesstormwater runoff from two state highways and provides sediment/toxicant/pathogen retention and nutrientremoval/retention/transformation as principal functions. The remaining impact occurs along the margins ofWetland A3 (0.1 acre) where a drainage outfall would be constructed at Spring Green Pond and the margins ofWetland P (0.1 acre) where a retaining wall would be constructed to accommodate a new turning lane at theintersection of Warwick Avenue and Fully Relocated Airport Road (Tables 5-101 and 5-102). Most of the perimeterwetland impact at this new intersection would consist of paved sections of Warwick Avenue. Table 5-103 listsstate-regulated freshwater wetlands impacted by Alternative B2.Significant Impacts: Under Alternative B2, approximately 5.8 acres of federal jurisdictional vegetated wetlandand approximately 773 linear feet of waterways would be altered by fill placement, affecting wetlands thatprovide six principal wetland functions. Principal wetlands functions that would be impacted include fish andshellfish habitat, wildlife habitat, nutrient removal/retention/transformation, floodflow alteration,sediment/toxicant/pathogen retention, and groundwater recharge/discharge. These impacts would meet theFAA standard of significance as the filled wetland areas would be substantially modified and would not sustainthe existing wetland functions and values.Table 5-101Alternative B2: Wetland Impacts by Program Element (acres)Wetland ID A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 I P TotalWetland Size 3.1 7.6 12.9 4.4 14.5 3.1 85.6 16.3 0.5 25.6 2.7 3.5 19.4 15.3 17.1 231.6Program ElementRunway 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0Runway 34 0 0 0 0 0 1.6 0 0.1 0 0.1 0.6 0 0.1 0 0 2.5Runway 5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0Runway 23 0 0 1 0 0 1 1.5 0 0 0 0 0 0 0 0 0 0 1.5Partially 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0RelocatedAirport RoadFully Relocated 0 1.1 0.1 0 0 0 0 0 0 0 0 0 0 0.5 0.1 1.8Airport RoadTotal 0 1.1 0.1 0 1.5 1.6 0 0.1 0 0.1 0.6 0 0.1 0.5 0.1 5.81 Temporary impact of less than 0.1 acres to install conduit for navigational aids. The impacted areas within these wetlands would be restored in place.Chapter 5 - Environmental Consequences 5-196 July 2011\\mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_CH05_Environmental_Cons_JUL_2011.doc