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Washington State Department
of Transportation (WSDOT) is constructing a new
suspension bridge planned for completion in 2007.
The bridge is being built parallel to and
south of the existing bridge and will create a safer,
less congested SR-16 corridor linking the peninsula
to Tacoma and Interstate 5.Construction of the
bridge is a 24 hour, on-going operation consisting
of heavy trucks, concrete booster pumps and batch
plants, and front-end loaders. Pierce County
has asked SSA Acoustics to monitor noise from construction
activities.
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We ensure that the project adheres to
the limits established by the Federal Highway Administration
(FHA) and are based on activity categories for various
land uses (see table below).
Sound level measurements
were taken using a Larson-Davis 820 Environmental
Noise Monitor, Type 1 Instrument (ANSI S1.4, DIN
IEC 651, 804). Measurements were made to document
the noise level exposure to the residents at nearby
apartments and equipment at the concrete batch plant.
Two types of measurements were completed.
The first set of measurements was made for
comparison with the FHA, 23 CFR Part 772, Procedures
for Abatement for Highway Traffic Noise and Construction
Noise. Secondary measurements were made to
verify the noise monitoring and mitigation methods
outlined by the WDOT, Tacoma Narrows Bridge Project
Operations Plan for Nighttime Construction Noise.Results
had indicated that noise from construction activities
had been exceeding the limits set by FHA. SSA
had concluded that measures would be necessary in
order to reduce the effects of noise on surrounding
properties.
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