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

T.F. Green Airport Improvement ProgramEnvironmental Impact Statement and Final Section 4(f) EvaluationBaseflow from groundwater maintains water levels in Buckeye Brook, Warwick Pond, and Tuscatucket Brook.Groundwater discharge maintains numerous wetlands surrounding the Airport. Buckeye Brook, Spring Green PondBrook, Tuscatucket Brook, and many smaller unnamed streams originate from wetlands fed by groundwater discharge.4.10.2.3 Water QualitySurface water quality in the Project Area is affected by stormwater discharges from the Airport and otherdeveloped land. The stormwater system on the Airport collects runoff from approximately 672 acres of the 1,100­acre property. In the remaining areas, stormwater may infiltrate through unpaved areas, flow into municipalstorm drains, or reach local receiving waters via overland flow. There are 13 drainage areas within the developedportion of the Airport, as shown in Figure 4-27 and listed in Table 4-32. The Project Area includes the Airport aswell as other land uses (roads, parking lots, industrial facilities, residential areas) that generate stormwater runoff.RIAC samples both the Airport outfalls and the local water bodies to determine the water quality impact ofAirport runoff. Three outfalls discharge to Tuscatucket Brook, the only Class A water body in the Project Area(see Note 3 to Table 4-31). Outfall data from sampling events are provided in Table 4-33.Table 4-32Drainage Areas and Outfalls within T.F. Green AirportDrainageAreaSize(acres) Land Use Treatment Outfall 1 Receiving Water1 5.9 Fueling Activated carbon filter, oil/waterseparator001A,100A 1City storm drain to Buckeye Brook north ofWarwick Pond2 93.4 Operations, fueling, cargo,hangarsOil/water separator, Vortechs system 002A Open swale to Buckeye Brook north ofWarwick Pond3 119.8 Runway, taxiway, terminalgaragesNone 003A Open swale to Buckeye Brook north ofWarwick Pond4 30.1 Runway, taxiway None 004A Tributary to Warwick Pond4B 2.0 Airfield None 004B Buckeye Brook south of Warwick Pond4C 3.0 Airfield None 004C Buckeye Brook south of Warwick Pond5 3.1 Runway None 005A Buckeye Brook south of Warwick Pond6 7.6 Runway None 006A Buckeye Brook south of Warwick Pond6B 1.5 Airfield None 006B Buckeye Brook south of Warwick Pond6C 0.8 Taxiway None 006C Buckeye Brook south of Warwick Pond6D 0.7 Taxiway None 006D Buckeye Brook south of Warwick Pond7 9.6 Taxiway None 007 Buckeye Brook south of Warwick Pond7B 1.2 Taxiway None 007B Buckeye Brook south of Warwick Pond8 240.6 Parking, taxiways, runways,deicing, fueling, cargoGlycol interceptor, oil/water separators,Vortechs system, detention basin, mobilecollection units, odor control008ATributary to Buckeye Brook south ofWarwick Pond9 38.4 Runway, taxiway None 009A Buckeye Brook south of Warwick Pond10 26.0 Runway, taxiway, secondary None 010A Grass swale to Tuscatucket Brookdeicing11 14.0 Runway, taxiway None 011A 2 Grass swale to Tuscatucket Brook12 46.4 Parking, taxiway Oil/water separator, Vortechs 012A 2 Grass swale to Tuscatucket Brooksystem, detention basin13 28.0 Maintenance facility Vortechs system, detention basin 0013A Tributary to Warwick PondSource: Gresham, Smith, and Partners (2008).1 Runoff from the fueling secondary containment area is treated and discharged upstream of Outfall 001A through Outfall 100A; therefore, all runoff from this areapasses ultimately through Outfall 001A.2 Outfalls 011A and 012A are now combined behind a single headwall, forming a combined point discharge from their two distinct drainage areas.Chapter 4 – Affected Environment 4-58 July 2011\\mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_CH04_Affected_Env_JUL_2011.doc