ATTACH B Noise Tech Report SR 509 NEPA Re-eval 11 09 2017 Final

2. What are the Phase 1 Improvements and how do they compare with the 2003 FEIS Alternative C2? ............................................................................................................................................. 7 3. What has changed in the affected environment since 2003? .................................................... 1 Noise regulation and impact criteria .................................................................................................... 1 Have the land uses and noise-sensitive areas changed since 2003? .................................................... 3 How have existing noise levels changed? ............................................................................................. 6 4. How does the Phase 1 Improvements noise analysis differ from the 2003 FEIS? ....................... 7 5. Would the Phase 1 Improvements result in any new significant impacts? ................................. 7 Traffic Noise Abatement ....................................................................................................................... 9 6. How would temporary construction effects compare to the 2003 FEIS Alternative C2? .......... 14 7. How would measures to minimize harm compare to the 2003 FEIS Alternative C2? ............... 14 8. Conclusion ............................................................................................................................... 14 References ..................................................................................................................................... 15 Attachments A– Procedures, Data, Excluded Parcels, and Approach Tables 1. Comparison of Design Components 2. FHWA Noise Abatement Criteria 3. Maximum Permissible Noise Levels for Nighttime Construction (dBA) 4. Estimated Number of Affected Receptors 5. Hourly Traffic Volumes used in Updated Analysis – Existing (2015) 6. Hourly Traffic Volumes used in Updated Analysis – No Action (2045) 7. Hourly Traffic Volumes used in Updated Analysis – Phase 1 Improvements (2045) 8. Noise Abatement Analysis Summary Figures 1. Project Vicinity 2. Design Components of FEIS Preferred Alternative (Alternative C2) and Phase 1 Improvements 3. Overlay Comparison of Alternative C2 and the Phase 1 Improvements 4. Sea-Tac Airport 2018 Noise Contours, Phase 1 Improvements Alignment, and Planned Federal Way Link…

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Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]