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

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T.F. Green Airport Improvement ProgramEnvironmental Impact Statement and Final Section 4(f) EvaluationTable 5-114 Annual Pollutant Loading by Drainage Area 1 (Alternative B2)Pollutant 2PercentageChange fromDrainage Area TSS P N Cu Pb Zn BOD COD Bacteria No ActionBuckeye Brook North 46,396 77 711 0 11 16 2,474 30,931 525,827 0.7%Warwick Pond 1,968 3 30 0 0 1 105 1,312 22,304 5.2%Buckeye Brook South 35,731 60 548 0 8 12 1,906 23,821 404,954 1.9%Mill Cove (cumulative) 3 84,095 140 1,289 0 19 29 4,485 56,064 953,085 1.3%Tuscatucket Brook 10,931 18 168 0 3 4 583 7,287 123,887 -0.4%Callahan Brook 9,853 16 151 0 2 3 526 6,569 111,670 -0.2%Brush Neck Cove (cumulative) 4 19,138 32 294 0 5 7 1,021 12,758 216,894 -0.3%Total 103,233 172 1,583 0 24 36 5,506 68,822 1,169,979 1.0%Source: VHB, Inc. TSS = Total Suspended Solids, P = Phosphorus, N = Nitrogen, Cu = Copper, Pb = Lead, Zn = Zinc, BOD = Biological Oxygen Demand, and COD =Chemical Oxygen Demand.1 A Highway Land Use Category was assumed the most appropriate Land Use Category for T.F. Green to determine the Event Mean Concentrations (EMCs)values. Other categories include Residential, Commercial, Industrial, and Undeveloped/Rural.2 The pollutants loading listed in this table represent the potential annual loading rate for the five drainage areas, totaling 1,360 acres, without the installation ofstormwater BMPs. Pollutants were calculated using the Simple Method (Schuster, 1987) which requires estimates of annual rainfall, site impervious cover, landuse type, and pollutant loading coefficients based on land use. Totals are rounded.3 The Mill Cove drainage area consists of the combined Buckeye Brook North, Warwick Pond, and Buckeye Brook South drainage areas evaluated in this analysis.4 The Brush Neck Cove drainage area consists of the combined Tuscatucket Brook and Callahan Brook drainage areas evaluated in this analysis.Table 5-115Alternative B2 and Alternative B4 Anticipated Annual Deicing Fluid UsageTotal GlycolAircraft Usage Change ChangeYear and Scenario Departures (gallons) (gallons) (percent)2004-2006 average annual 60,714 133,7752015 No-Action Alternative 46,750 71,9952015 No-Action plus Alternative B4 50,553 77,851 +5,856 +8.1%2020 No-Action Alternative 49,665 76,4842020 No-Action plus Alternative B2 or B4 54,058 83,249 +6,765 +8.8%2025 No-Action Alternative 52,776 81,2752025 No-Action plus Alternative B2 or B4 57,156 88,020 +6,745 +8.3%Source: VHB, Inc.Notes: Baseline glycol use is average of 2004-2005 and 2005-2006 years Alternatives B2 and B4 have the same predicted increase in the number of aircraft operations(12 departing flights per day) with operations beginning in 2015 for Alternative B4 and 2020 for Alternative B2. Based on revised 2010 FEIS No-Action operationsforecast.Chapter 5 - Environmental Consequences 5-216 July 2011\\mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_CH05_Environmental_Cons_JUL_2011.doc
T.F. Green Airport Improvement ProgramEnvironmental Impact Statement and Final Section 4(f) EvaluationIndirect ImpactsAlternative B2 would increase the amount of parking areas and roadways within the Greenwich Bay watershedby 17.8 acres. All new roadway and parking areas would include mitigation measures designed to meet statestormwater requirements and would not adversely affect water quality. Alternative B2 would therefore notresult in adverse indirect impacts to the coastal watershed.Significant Impacts: Alternative B2 would not result in significant impacts to water quality. Increases inimpervious surfaces are mitigated for Alternative B2 through the design of a stormwater management systemdeveloped in compliance with regulatory standards.5.11.4.3 Alternative B4This section describes the direct and indirect impacts that would occur under Alternative B4. Table 5-116 shows thechanges in impervious area within the affected drainage areas. This analysis has been revised since the DEIS andnow assumes that the existing roadways will not be removed within the acquisition areas with the exception ofroadways that are to be relocated, such as Airport Road, or are physically impacted by the Improvement Program.Compared to the No-Action Alternative, Alternative B4 would increase the total impervious area by 70.2 acres, ofwhich the majority is split among the Buckeye Brook North drainage area (21.9 acres caused by the new taxiways,and Integrated Cargo areas), the Buckeye Brook South drainage area (34.9 acres caused by the new Runway 16-34RSA enhancements, the new taxiways, and the south service area) and the Tuscatucket Brook watershed (14.6 acrescaused by the Runway 5-23 extension). These would be partially offset by decreases due to removing commercial andresidential parking lots required for construction. Alternative B4 would include stormwater controls that willmanage discharges to Warwick Pond, Buckeye Brook North, Buckeye Brook South, and Tuscatucket Brook andwould limit peak flows and erosion at the outfalls and in the downstream reaches of these brooks. In addition,Callahan Brook would have reduced overall peak flow due to the decreased impervious area in the watershed.Table 5-116 Impervious Surfaces by Drainage Area (Alternative B4)Impervious Area (acres) 1 Alternative B4 Change in Impervious Area (acres) 2Drainage Area No-Action Alt. B4Required forConstruction 3Voluntary LandAcquisition Areas 4 TotalBuckeye Brook North 237.0 258.9 +21.9 0 +21.9Warwick Pond 11.7 12.9 +1.2 0 +1.2Buckeye Brook South 161.6 196.5 +34.9 0 +34.9Mill Cove (cumulative) 5 410.3 468.3 +58.0 0 +58.0Tuscatucket Brook 35.0 49.6 +15.0 (0.4) +14.6Callahan Brook 24.3 21.9 +1.1 (3.5) (2.4)Brush Neck Cove (cumulative) 6 59.3 71.5 +16.1 (3.9) +12.2Total 469.6 539.8 +74.1 (3.9) +70.2Source: VHB, Inc.1 Portions of the watersheds that fall within the maximum combined footprint of the Alternatives (including both on and off Airport areas). 2 Includes existing pavement, proposed pavement, and impervious surfaces from land acquisitions. Existing roadways were assumed to remain impervious.3 Construction elements include EMAS, parking, roadways, taxiways, and RSA and RPZ clearing, depending on drainage area.4 Associated with the Completed and Current Part 150 VLAP.5 The Mill Cove drainage area consists of the combined Buckeye Brook North, Warwick Pond, and Buckeye Brook South drainage areas evaluated in this analysis.6 The Brush Neck Cove drainage area consists of the combined Tuscatucket Brook and Callahan Brook drainage areas evaluated in this analysis.Chapter 5 - Environmental Consequences 5-217 July 2011\\mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_CH05_Environmental_Cons_JUL_2011.doc
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