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) Evaluation6.21.8.3 Mitigation Site 5This site has been added for Alternative B2 only. It is a wetland restoration site adjacent to the Pawtuxet Riverin Cranston.6.21.8.4 Mitigation Site 6This site would be expanded to approximately 1.0 acres for Alternative B2 with the target cover type forestedwetland.6.21.8.5 Mitigation Site 7This wetland restoration/creation site is located within the exit ramp infield that includes filled wetlands. Thissite is only being considered for mitigation for Alternative B2. This mitigation site would replace the waterquality function of Wetland I lost due to the construction of Fully Relocated Airport Road.Table 6-21Alternative B2: Wetland Mitigation Estimated AcreageWetland Mitigation TypeWetland MitigationSite NumbersCompensation SiteArea (acres) 1USACE New England DistrictRecommended Ratio 2Impacted WetlandArea EquivalentCreation/Restoration (In Kind) 3 1, 3, 5, 6, & 7 7.3 2.59:1 4 2.8Restoration/Enhancement (In Kind) 3 0.2 3:1 0.1Wetland/Buffer Preservation 8 & 12 44.0 15:1 2.9Total 44.9 NA 5.1 51 The mitigation program will replace the functions and values of the impacted wetlands as required by USACE.2 Weighted average for all wetland classes impacted from New England District Compensatory Mitigation Guidance (7-20-2010) Table 1.3 PEM dominated by Phragmites will not be replaced in kind.4 The mitigation equivalent of a creation/restoration site is calculated by dividing the area of the site by 2.59.5 Alternative B2 would require mitigation for the loss of 5.8 acres of wetland.The mitigation program for Alternative B2 requires more sites than Alternative B4 to achieve its goal due to thegreater area of wetland impact and the greater amount of forested wetland impacted (3.4 acres forAlternative B2 versus 0.2 acres for the Preferred Alternative). A mitigation program including more sites wouldbe proposed to compensate for the impacts associated with Alternative B2.6.21.9 Water QualityBased on the impact analysis presented in Chapter 5, Environmental Consequences, there are no significantimpacts on water quality as a result of Alternative B2. There would be no significant impacts to water quality,although there would be increases in impervious surfaces within some drainage areas for Alternatives B2 andB4 and lost water quality function of some wetlands as described above. Proposed stormwater mitigationmeasures developed in compliance with all applicable regulatory standards, including the RIDEM 2010Stormwater Design and Installation Standards Manual, would address the water quality impacts and ensure thereceiving waters would not be impacted from new discharges.Alternative B2 would have greater water quality impacts than Alternative B4 due to a substantial increase inroadway and parking areas. Alternative B2 requires greater overall new impervious area and would have a newstormwater discharge to Spring Green Pond from the Fully Relocated Airport Road. Alternative B2 would resultChapter 6 – Mitigation 6-50 July 2011\\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_CH06_Mitigation_JUL_2011.doc
T.F. Green Airport Improvement ProgramEnvironmental Impact Statement and Final Section 4(f) Evaluationin a net increase in roadway and parking area (impervious surfaces), with a 17.8-acre net increase, andAlternative B4 would result in no net change in roadway and parking area (impervious surfaces).Alternative B2 would incorporate three types of control measures to minimize changes to hydrology and waterquality: designed stormwater controls; operations and maintenance procedures; and construction-period controlmeasures, as described in Section 6.10, Water Quality, for Alternative B4. The conceptual design for AlternativeB2 is intended to comply with the most recent draft of the Rhode Island Stormwater Design and InstallationStandards Manual. No mitigation is required aside from compliance with RIDEM standards.6.21.10 Fish, Wildlife, and PlantsBased on the impact analysis presented in Chapter 5, Environmental Consequences, Alternative B2 would notsignificantly impact fish, wildlife, and plants. While the habitat for two state-listed species were observed in theProject Area (the pine barrens tiger beetle, and sickle-leaved golden aster), these habitats would not be impactedby Alternative B2. Alternative B2 would impact a 142-linear foot segment of Buckeye Brook north of LakeshoreDrive including the extension of an existing culvert by 30 linear feet. In order to avoid obstructing river herringpassage to spawning areas in Spring Green Pond, a new culvert would be designed to maintain passage. Therelocated stream channel would also be designed to promote fish passage to and from Spring Green Pond.Similar to Alternative B4, Alternative B2 avoids impact to important plant and wildlife habitat south ofRunway 34 and would not require additional mitigation.6.21.11 Threatened and Endangered SpeciesThere are no federally listed species of concern or threatened or endangered species within the Project Area and,therefore, there would be no significant impacts to threatened or endangered species as a result of theT.F. Green Airport Improvement Program. No mitigation is required.6.21.12 FloodplainsAlternative B2 would result in significant impacts as it would require filling of approximately 0.5 acres offloodplain. Alternative B2 would constitute a “significant encroachment” since it would cause adverse impactson natural and beneficial floodplain values. Alternative B2 would impact 0.7 acres less floodplain thanAlternative B4, and therefore less mitigation would be required.Alternative B2 impacts Lower Buckeye Brook through the construction of a new access road to the AMF andconstruction of the glide slope critical area east of the Runway 23 End. Partial mitigation for fill placed in theLower Buckeye Brook floodplain between Airport Road and Lakeshore Drive would be achieved by theremoval of an existing roadway fill section in this floodplain that is no longer needed by the Airport. Floodingof Lakeshore Drive would also be mitigated by replacing the existing, restrictive culvert under Lakeshore Drivewith a new structure with greater capacity. Additional mitigation measures would be implemented in BuckeyeBrook through the removal of existing roadway fill sections between Airport Road and Lakeshore Drive northof Warwick Pond (Wetland Mitigation Site 3) and with the construction of Wetland Mitigation Site 1, describedin Section 6.9, Wetlands and Waterways.Chapter 6 – Mitigation 6-51 July 2011\\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_CH06_Mitigation_JUL_2011.doc
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