HomeMy WebLinkAboutExhibit10_WSDOT_PPT_200519I-405 Renton to Bellevue -
Project-Wide Borings
LUA20-000058, V-H
Clark H. Close, Senior Planner
cclose@rentonwa.gov
425-430-7289
May 19, 2020
Brief Description
•WSDOT is requesting a noise variance from RMC 8-7-2 to complete I-405
geotechnical investigation work at night between Mile Post 3.20 and Mile
Post 7.10.
•The geotechnical investigation planned is a drilled hole at 30 locations to
approx. 120 feet in depth.
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BEGIN PROJECT
MP 3.20
I-405 END PROJECT
MP 7.10
NE 44thStN 30thStI-405
Lake Washington
Brief Description
•The work will be conducted within the
State’s Limited Access Right-of-Way along
I-405.
•Construction Time Frame –
•Each boring is anticipated to take
between one (1) and two (2) nights
per location -65 total nights.
•Start as soon as April 20, 2020 and
end by July 31, 2020. Requesting an
expiration date of September 30,
2020 in case of delays due to
unforeseen circumstances.
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Zoning
•The zoning along the construction corridor
consists of RC, R-1, R-4, R-6, R-8, RMF, IH,
CN, CA, CD, CO, COR, and UC.
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WAC 173-60-040
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Equipment Sound Level
(dBA)at 50 ft
dBA at
100 ft
dBA at
200 ft
dBA at
300 ft
1-ton pickup trucks/Flat bed 71 68 65 63
Auger Drill 82 76 70 66
Excavator 70 64 58 54
Crane 68 62 56 48
Front Loader 66 60 54 51
Chainsaw 73 67 61 58
Portable Light Plants & Generators 61 64 58 55
Construction Equipment
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•Construction Equipment used during the night time operations include:
Mitigation Measures
1.Truck tailgate banging is prohibited. All trucks shall be secured to prevent excessive noise from
banging.
2.All trucks performing export haul shall have well maintained bed liners as inspected and
approved by the Engineer.
3.All trucks shall be equipped with broadband back up alarms.
4.Temporary noise shield shall be placed, if feasible.
5.WSDOT/FLJV personnel will receive training and update of the conditions under which this
variance was granted.
6.Provide a WSDOT/FLJV complaint number as well as a list of designated contact persons for the
purpose of forwarding complaints.
7.WSDOT/FLJV will notify by US mail residents, within 300 feet of the sites ten (10) days prior the
night work commencement. This notification will include the type of work, as well as phone
number or email to request more information including specific requests or concerns (Exhibit 8 ).
8.WSDOT/FLJV will provide ear plugs and/or White Noise machines upon request if during the
notification process the residents requires them.
9.WSDOT/FLJV will respond to any notified resident if during the notification process the residents
requires special accommodations.
10.WSDOT/FLJV will implement a night time noise monitoring if complaints are received.
11.As an additional measure the City is requesting to post night time work on the WSDOT
Web/Internet site to resident have web site access to information that the City of Renton
might see as appropriate.
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Recommendation
Staff recommends approval of the I-405 Renton to Bellevue -Project-Wide
Borings Noise Variance, File No. LUA20-000058, V-H, subject to the
following condition:
Mitigation Measure:
1.The Applicant and the Design Build Contractor shall implement
the self-imposed 11 noise mitigation measures to diminish or
eliminate noise during the project-wide geotechnical borings. In
addition, a summary of any noise-related complaints received
and the response provided shall be provided to the City’s project
manager within five (5) days of receiving the complaint.
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