sound transit 6/17/09 noise and construction meeting
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Agenda6:00 Open House
6:30 Presentations– Welcome (Ron Endlich)
– Project Overview (Michelle Ginder) – Construction sequence and activity
– Construction Updates (ped safety, site walls)
• Nighttime Construction Noise (Jeff Munnoch)– Noise Variance Process
– Noise Impacts and Mitigation
– Community Involvement and Next Steps
7:15 Q & A
7:45 Return to Open House
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Sound TransitCapitol Hill Station Construction Noise and Project Update
June 17, 2009
6:00 – 8:00 PM
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Agenda6:00 Open House
6:30 Presentations– Welcome (Ron Endlich)
– Project Overview (Michelle Ginder) – Construction sequence and activity
– Construction Updates (ped safety, site walls)
• Nighttime Construction Noise (Jeff Munnoch)– Noise Variance Process
– Noise Impacts and Mitigation
– Community Involvement and Next Steps
7:15 Q & A
7:45 Return to Open House
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• 3.15-mile extension of Initial Segment and Airport Link– Capitol Hill Station– UW Station and crossover
• Schedule– Design: completed– Construction: 6.5 years– System testing: 6 months– Open for Service: 2016
• Adds 70,000 daily riders, 114,000 riders systemwide (2030)
University Link
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Capitol Hill Station
• Underground station with 3 entrances
• Staging area - station and tunnel excavation at site
• Ridership: 14,000 daily boardings
• Travel time: – 6 minutes to downtown
Seattle (University St.)
– 3 minutes to UW Station
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Capitol Hill Station Schedule
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1. Demolition and Remediation• Jan. 2009 to mid-2009• 75% Recycling and salvage
goal being met• Construction trailers• Site will be lowered, paved
and remain fenced
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Recycled and Salvaged Items
• A large amount of materials that otherwise would have been taken to landfills has been removed for re-use.
• Recycled Demolition Material to Date: 2,890 Tons
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2. I-5 Undercrossing Work
Paramount
Theater
Convention Place Station
PINE STREET
BO
REN
STREET
NB
I-5
SB
I-5
Work Area
Wo
rk Area
• I-5 undercrossing contract awarded in February
• Prepares I-5 structures for future tunnel boring machines– Work being done now to avoid
conflicts with other WSDOT freeway work and later U-Link contracts
– Coordinated agency outreach to public on ramp closures
– Contractor incentives to complete the work early
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I-5 Ramp Closures
Pine Street
Pike Street
Detour info at www.soundtransit.org/u-link
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3. Station Excavation, Tunneling• Jan. 2010 to Dec. 2012• Fenced work sites• Denny Way and parts of Nagle Place
closed to traffic• Sidewalks open
– Will be few short term closures
• Single Tunnel Boring Machine (TBM)• 24/7 surface activity to support
tunneling• High truck volumes
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Construction Walls• Plywood walls will surround and screen main
construction site perimeter 2010-2015• Wall Height:
– 8 ft. tall along Broadway– 16 ft. tall along 10th Ave– Transition from 8 to 16 ft. along northern (John St.) and
southern borders
• Contractor required to maintain fence (repaint annually, graffiti removal within 24 hours)
• Appearance will include ST Art program elements, ST project information, and Capitol Hill business marketing elements
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Truck Haul Routes(beginning 2010)
• High visibility crossing signs
• Re-stripe crosswalks• Restrict parking at
intersections
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SDOT Pedestrian Improvements
• Crosswalk and warning signs on the east leg of Summit Ave and Denny Way
• Curb bulb on the SW corner of E Denny Way and Boylston Ave.
• Further options to improve the crossing of Olive Way at Boylston Ave. are under consideration
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4. Station Construction• Jan. 2013 to Dec. 2015• Less trucking activity• Sidewalks open
– Will be few short term closures• Cut and cover pedestrian tunnel
across Broadway (6 months)– Roadway remains open– Parking restrictions near work
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Capitol Hill Station
Construction Noise Variance for Nighttime Construction
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Why must work occur at night?
• Anticipate two years of 24/7 construction activity to support tunneling work at Capitol Hill site beginning in early 2011
• Certain activities are required for tunnel worker safety• Maximizes project safety, efficiency, duration and cost
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What goes on at night?
• No high impact equipment (jackhammers, concrete saws, etc.)
Type of Equipment:
• Tunnel ventilation fans, pumps, air compressors
• Generators
• Vehicles– hauling and delivery trucks– muck haul trucks– front-end loaders, backhoe– loaders, excavators
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Noise Mitigation Requirements
Solid plywood construction screening wall between 8-16’ tall around site
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Stationary equipment (compressors, generators) enclosed in noise reducing material
Noise Mitigation Requirements
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• Nighttime Truck Operations– No tonal back up alarms– Engine idle limit of 5 minutes– Haul trucks prohibited on 10th
Ave E during night hours – No compression brakes– Muck haul bins lined with
noise dampening material
Noise Mitigation Requirements
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Existing noise on 10th Ave
Existing noise on Broadway
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Nightime Noise PredictionsHourly night-time average
54 dba existing65 dba construction+ 0 to11 dba
65 dba existing70 dba construction
+ 0 to 5 dba
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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 after 1 year
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Capitol Hill Site Noise Variance• Requires application for Major Public Project Construction Noise
Variance from City of Seattle • Noise variance establishes noise limits for contractor work between
10pm - 7am weekdays, 10pm - 9am weekends, holidays • Daytime construction activities will comply with City’s construction
noise limits
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Next Steps
• Receive comments and questions tonight
• ST to incorporate feedback into variance application
• City of Seattle (DPD) will hold a public meeting to receive comments late summer
• City will decide whether to approve a noise variance within 60 days after public comment is received
• Contractor will prepare a detailed noise management plan
• Follow-up information at meeting(s) later this year
• Tunnel construction activities begin – early 2011
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Staying Informed
• Monthly electronic newsletters www.soundtransit.org/subscribe
• Printed and electronic construction alerts
• Regular construction update meetings
• Full time outreach staff
• 24 hour construction hotline 1-888-298-2395
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Questions?