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SEPA Addendum to the East Link Project Final Environmental Impact Statement

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SEPA Addendum to the East Link Project Final Environmental Impact Statement Attachment 16 DOWNTOWN REDMOND LINK EXTENSION 2018 SEPA Addendum to the East Link Project Final Environmental Impact Statement AUGUST 2018 Attachment 16 Downtown Redmond Link Extension SEPA Addendum to the 2011 East Link Project Final Environmental Impact Statement Prepared pursuant to the Washington State Environmental Policy Act Chapter 43.21C RCW and WAC 197‐11‐625 August 2018 Prepared for Central Puget Sound Regional Transit Authority 401 S. Jackson Street Seattle, WA 98104 Prepared by Parametrix 719 2nd Avenue, Suite 200 Seattle, WA 98104 T. 206.394.3700 F. 1.855.542.6353 www.parametrix.com Downtown Redmond Link Extension SEPA Addendum Attachment 16 Sound Transit TABLE OF CONTENTS EXECUTIVE SUMMARY ..................................................................................................................... ES‐1 ES.1 Introduction ................................................................................................................................ ES‐1 ES.2 Proposed Design Refinements .................................................................................................... ES‐1 Redmond Technology Center Station to Sammamish River ....................................................... ES‐1 Sammamish River to Bear Creek ................................................................................................. ES‐1 Bear Creek to Downtown Redmond ........................................................................................... ES‐2 ES.3 Summary of Impacts and Mitigation .......................................................................................... ES‐2 ES.4 Conclusions ................................................................................................................................. ES‐3 1 PROJECT BACKGROUND ........................................................................................................ 1‐1 2 PROPOSED DESIGN REFINEMENTS AND OTHER CHANGES ..................................................... 2‐1 2.1 Proposed Design Refinements ...................................................................................................... 2‐1 2.1.1 Redmond Technology Center Station to Sammamish River ........................................ 2‐1 2.1.2 Sammamish River to Bear Creek .................................................................................. 2‐3 2.1.3 Bear Creek to Downtown Redmond ............................................................................. 2‐6 2.1.4 Operations and Maintenance ....................................................................................... 2‐6 2.2 Construction .................................................................................................................................. 2‐6 2.2.1 Staging Areas and Construction Easements ................................................................. 2‐6 3 CHANGES IN IMPACTS AND MITIGATION .............................................................................. 3‐1 3.1 Transportation .............................................................................................................................. 3‐1 3.1.1 Impacts during Operation ............................................................................................. 3‐2 3.1.2 Impacts during Construction ...................................................................................... 3‐10 3.1.3 Potential Mitigation Measures ................................................................................... 3‐10 3.2 Acquisitions, Displacements, and Relocations ............................................................................ 3‐14 3.2.1 Impacts during Operation ........................................................................................... 3‐14 3.2.2 Impacts during Construction ...................................................................................... 3‐15 3.2.3 Potential Mitigation Measures ................................................................................... 3‐15 3.3 Land Use and Economics ............................................................................................................ 3‐15 3.3.1 Impacts during Operation ........................................................................................... 3‐16 3.3.2 Impacts during Construction ...................................................................................... 3‐17 3.3.3 Potential Mitigation Measures ................................................................................... 3‐17 3.4 Visual Resources ......................................................................................................................... 3‐17 3.4.1 Impacts during Operation ........................................................................................... 3‐17 3.4.2 Impacts during Construction ...................................................................................... 3‐21 3.4.3 Potential Mitigation Measures ................................................................................... 3‐21 3.5 Noise and Vibration .................................................................................................................... 3‐22 3.5.1 Impacts during Operation ........................................................................................... 3‐22 3.5.2 Impacts during Construction ...................................................................................... 3‐27 3.5.3 Potential Mitigation Measures ................................................................................... 3‐27 3.6 Ecosystem Resources .................................................................................................................. 3‐28 3.6.1 Impacts during Operation ........................................................................................... 3‐29 3.6.2 Impacts during Construction ...................................................................................... 3‐33 3.6.3 Potential Mitigation Measures ................................................................................... 3‐34 August 2018 │ Downtown Redmond Link Extension i Downtown Redmond Link Extension SEPA Addendum Attachment 16 Sound Transit TABLE OF CONTENTS (CONTINUED) 3.7 Water Resources ......................................................................................................................... 3‐35 3.7.1 Impacts during Operation ........................................................................................... 3‐35 3.7.2 Impacts during Construction ...................................................................................... 3‐38 3.7.3 Potential Mitigation Measures ................................................................................... 3‐38 3.8 Utilities ........................................................................................................................................ 3‐39 3.8.1 Impacts during Operation ........................................................................................... 3‐39 3.8.2 Impacts during Construction ...................................................................................... 3‐39 3.8.3 Potential Mitigation Measures ................................................................................... 3‐40 3.9 Historic and Archaeological Resources ....................................................................................... 3‐40 3.9.1 Impacts during Operation ........................................................................................... 3‐40 3.9.2 Impacts during Construction ...................................................................................... 3‐41 3.9.3 Potential Mitigation Measures ................................................................................... 3‐41 3.10 Parkland and Open Space ........................................................................................................... 3‐42 3.10.1 Impacts during Operation and Construction .............................................................. 3‐42 3.10.2 Potential Mitigation Measures ................................................................................... 3‐46 3.11 Section 4(f)/6(f) Resources ......................................................................................................... 3‐47 3.11.1 Park and Recreational Resources ............................................................................... 3‐47 3.11.2 Historic and Cultural Resources .................................................................................. 3‐53 3.11.3 Grant‐Funded Recreational Resources and Impacts .................................................. 3‐53 3.11.4 Record of Coordination .............................................................................................. 3‐54 4 INDIRECT AND CUMULATIVE IMPACTS .................................................................................. 4‐1 4.1.1 Transportation .............................................................................................................. 4‐1 4.1.2 Land Use and Economics .............................................................................................. 4‐1 4.1.3 Visual ............................................................................................................................ 4‐3 4.1.4 Noise and Vibration ...................................................................................................... 4‐3 4.1.5 Ecosystems ..................................................................................................................
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