FEIS Summary - Knik Arm Bridge and Toll Authority

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Knik Arm Crossing Final EIS Summary Exhibit S-23 Environmental Impacts Associated with Construction and Operation of the Recommended Alternative (continued) Impact category Construction impacts Indirect impacts Cumulative impacts Impacts on the Cultural Environment Impacts on Archaeology and Historic Preservation Direct impacts Construction impacts Indirect impacts Cumulative impacts Impacts on Recreational Resources, Parks, and Wildlife Refuges Direct impacts Construction impacts Northern Access Alternative (Mat-Su Side) Recommended Alternative Southern Alignment Crossing with 8,200-Foot Bridge and Connecting Roadways on Gravel Fill (The Crossing) Erickson Alternative (Anchorage Side) Temporary increases in nonpoint and point source contamination could occur during construction as a result of improper storage or spills of hazardous materials within aquifer recharge areas. Increased residential and business development may adversely affect the area including: • aquifers through both point source and nonpoint source • street maintenance practices such as oiling roads for dust control affecting nearby shallow groundwater resources • increased vulnerability to bacteria, viruses, nitrates, and nitrites in areas with shallow ground water • bacteria and nutrients from livestock or pet wastes • sediment from mining or construction • fertilizers from agricultural and new residential areas N/A A deceleration in development growth will likely reduce water use within the Anchorage Bowl and reduce the rate of increase of drawdown of Anchorage-area aquifers. The KAC Project, along with reasonably foreseeable future actions in the Mat-Su Borough, will add to the general decline in ground water quality. Wastewater generation and residential water consumption will approximately triple existing rates by 2030. The prevalence of community or municipal stations will be critical for ground water resources. None Indirect and cumulative impacts will occur due to shifts in growth and development. None None None None None Direct impacts on the Government Hill Urban Renewal Historic District could include visual and audible elements as part of Phase 1 and 2. Noise impacts will not exceed FHWA abatement criteria. Three contributing properties in the Government Hill Urban Renewal Historic District will be adversely effected as part of Phase 2 due to acquisition. Harvard Park The KAC Project would result in: 2% of park used 0.10 acre of ROW acquired 4.55 acres remaining Sunset Park The KAC Project would result in: 31% of park used 1.70 acres of ROW acquired 3.75 acres remaining Harvard and Sunset Parks Parks may be temporarily unavailable to the public during construction. (continued on next page) Exhibit S-23 Environmental Impacts Associated with Construction and Operation S-42
Knik Arm Crossing Final EIS Summary Exhibit S-23 Environmental Impacts Associated with Construction and Operation of the Recommended Alternative (continued) Impact category Indirect impacts Cumulative impacts Impacts on the Visual Environment Direct impacts Construction impacts Indirect impacts Cumulative impacts Impacts on the Section 4(f) Environment Direct impacts Northern Access Alternative (Mat-Su Side) Recommended Alternative Southern Alignment Crossing with 8,200-Foot Bridge and Connecting Roadways on Gravel Fill (The Crossing) Increased utilization of recreational resources due to shifts in growth and development, and ease of access. Recreational use of other Government Hill neighborhood parks will increase because of Sunset Park’s becoming less available. The proposed project would include several key components that would impose changes to the existing visual environment: • an upgraded and widened Point MacKenzie Road that would connect to an embankment roadway section on the west side of Knik Arm • a piling-supported bridge crossing of Knik Arm • a fill embankment placed in Knik Arm at the east and west approaches of the Southern Alignment alternative over Knik Arm • a cut/fill section connecting the crossing approach to Government Hill • a cut-and-cover tunnel structure under a portion of Government Hill • the approaches and bridge crossing of Ship Creek connecting the Government Hill neighborhood to Ingra and Gambell Streets Construction will be expected to cause visual quality impacts due to construction equipment and materials and roadway cuts. Some currently undeveloped space will be developed and vegetation will be removed. Light pollution from new population growth will occur. Viewsheds will be altered in minor ways because of already ongoing urban/commercial development. Bridge crossing opens the area to visual experiences previously unavailable. None None Erickson Alternative (Anchorage Side) Section 4(f) Recreational Properties The KAC Project would result in: Harvard Park: 2% of park used 0.10 acres of ROW acquired 4.55 acres remaining Sunset Park: 31% of park used 1.70 acres of ROW acquired 3.75 acres remaining Section 4(f) Historic Properties Will adversely affect three contributing buildings in the Government Hill Urban Renewal District due to acquisition. Construction impacts None None Harvard and Sunset Parks may be temporarily unavailable to the public. Indirect impacts Cumulative impacts None None Increased use in other Government Hill neighborhood parks because of Sunset Park’s unavailability. Implementation of reasonably foreseeable future actions, such as the Highway-to-Highway connection, expansion/development of Port MacKenzie, upgrading roads in Southwest Mat Su, and the Mat-Su Access Project (Little Susitna River Crossing) could improve access to Section 4(f) resources (including connecting recreational trails) and influence use. (continued on next page) Exhibit S-23 Environmental Impacts Associated with Construction and Operation S-43
Page 1 and 2: Knik Arm Crossing Final Environment
Page 3 and 4: Exhibit S‐1. Final EIS Document O
Page 5 and 6: Knik Arm Crossing Final EIS Summary
Page 15 and 16: Exhibit S‐22. Reasons for Preferr
Page 17 and 18: Findings, Compliance, and Permits E
Page 25 and 26: ! ! ! ! ! ! ! ! ! ! ! ! Knik Arm Cr
Page 33 and 34: The preliminary design includes pla
Page 35 and 36: Summary Initial Construction (Phase
Page 41: Knik Arm Crossing Final EIS Summary

FEIS Summary - Knik Arm Bridge and Toll Authority

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