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2010 2 11 Noise Public Meeting
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2010 2 11 Noise Public Meeting

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  • 1. Sound Transit Capitol Hill Station Major Public Project Noise Variance February 11, 2010 6:30 p.m. – 8:30 p.m. SCCC
  • 2. University Link • 3.15-mile light rail extension – Capitol Hill Station – UW Station • Schedule – Construction: 6.5 years – Open for Service: 2016 • Adds 70,000 daily riders, 114,000 system wide (2030)
  • 3. Expanding light rail • 16 miles and13 stations in service • 36 additional miles funded
  • 4. Capitol Hill Station • Underground station with 3 entrances • Staging area - station and tunnel excavation at site • Ridership: 14,000 daily boardings • Travel time: – 3 minutes to downtown Seattle (University St.) – 3 minutes to UW Station
  • 5. Capitol Hill Site Noise Variance • Sound Transit has applied for variance from City of Seattle • Noise variance establishes noise limits for contractor work between 10pm - 7am weekdays, 10pm - 9am weekends, holidays • Variance would allow up to 26 months of nighttime activity • Daytime construction activities will comply with City’s construction noise limits.
  • 6. Previous Outreach on Noise Variance • June 17, 2009: – Initial nighttime construction plans and noise predictions • October 8, 2009: – Updated noise measurements – Proposed mitigation measures – Noise variance application and process – Added trucking restrictions on 10th • Jan 14, 2010: – Review of nighttime work – Status update on variance – Wall height on 10th Ave. increased
  • 7. Why Work at Night? • Continuous tunneling has lower risk • Certain activities are required for tunnel worker safety • Maximizes project safety, efficiency, duration and cost
  • 8. Construction Schedule Nighttime construction activity
  • 9. What Goes on at Night? Type of Equipment: • Tunnel ventilation fans, pumps, air compressors • Generator • Vehicles – hauling and delivery trucks – muck haul trucks – front-end loaders, backhoe – loaders, excavators • No high impact equipment (jackhammers, concrete saws, etc.) will be allowed at night
  • 10. Existing Nighttime Noise Hourly nighttime average (midnight – 5 AM) 63 dba 54 dba 63 dba 53 dba 54 dba
  • 11. Nighttime Noise Limits with Variance 6 dba increase from existing 69 dba 60 dba 69 dba 59 dba 60 dba
  • 12. Noise Mitigation Requirements - Walls • Surround the site on all sides • 8 to 24 feet high, plywood construction • Help contain noise, dust, and debris KEY 8’ wall 12’ wall 16’ wall 24’ wall
  • 13. Noise Mitigation Requirements - Equipment Stationary equipment (compressors, generators) enclosed in noise reducing material
  • 14. Noise Mitigation Requirements - Trucking • Nighttime truck operations – No tonal back up alarms – Engine idle limit of 5 minutes – No compression brakes – Muck haul bins lined with noise dampening material – Haul trucks prohibited on 10th Ave during night hours
  • 15. Monitoring and Responding to Complaints • Continuous sound monitoring stations • 24 - hour construction hotline: 1-888-298-2395 • Independent response by City noise abatement specialist • City, ST and contractor will investigate, determine how to prevent future incidents, and respond back to caller • City review of variance after 1 year
  • 16. Next Steps • Comments from tonight’s meeting are recorded and considered in the review of the application • City will decide whether to approve the noise variance within 60 days after public comment is received • Contractor will prepare a detailed noise management plan to comply with variance conditions • Tunnel construction activities begin – late 2010