RAILROAD NOISE continued
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SAN MARCOS NCTD LIGHT RAIL
NOISE STUDY:
AAC completed a light rail noise study for the City of San
Marcos to address the impact of the NCTD Light Rail Project on noise
sensitive residential receptors within the City. The study evaluated the
findings of the NCTD EIR and compared the results with modeled analyses
specific to the City of San Marcos Residential Receptors. The noise
associated with an alternative grade crossing was also evaluated as part
of this study. Noise control measures in the form of soundwalls and
administrative controls were recommended to reduce the noise impact at
the residences located nearest the study segment. A report of findings
was prepared which summarized the analyses and recommendations.
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UPRR/METROLINK
BY-PASS:
AAC
conducted a rail noise impact analyses for the UPRR By-Pass Project in
Pomona. The purpose of the study was to evaluate the noise impact
associated with a proposed Metrolink by-pass to alleviate traffic on the
main UPRR line. Analyses was performed to evaluate the future CNEL from
rail operations based on two alternative track configurations. Impact
analyses was assessed with respect to the FTA noise guidelines for
sensitive receptors. A report of findings was prepared that summarizes
the analyses and noise control alternatives recommended to reduce rail
noise impacts at nearby sensitive residential receptors.
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LA BREA SHAFT
METROLINK ACCESS SITE:
A noise and vibration monitoring and reporting plan was
prepared by AAC staff for the reconstruction of the La Brea Metrolink
Access Site. Metrorail construction created high noise and vibration
levels that were intrusive upon the sensitive residential and church
uses that bordered the access site. The vibration and noise monitoring
program specified daily measurements at the nearest residential
receptors to the project site. Whenever exceedances were observed, the
resident engineer was notified, and mitigation measures were applied to
reduce the noise and vibration. If the exceedances were not reduced,
then the project halted until more effective measures could be enacted
to minimize the noise and vibration. A weekly report was prepared to
summarize the results of the monitoring and mitigation actions taken.
Each report was submitted to the MTA for review and ultimate approval.
The development and execution of the monitoring and reporting program
allowed construction to be completed on time and the interference onto
the community to be minimized.
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NORTH HOLLYWOOD
METROLINK STATION:
AAC staff prepared noise and vibration monitoring plans and
studies for the construction of the North Hollywood Metrolink Station.
Metrorail construction created high vibration and noise levels that were
intrusive upon the sensitive residential uses that bordered the project
site. A vibration and noise monitoring program was created to measure
and report vibration and noise levels at the nearest residential
receptors to the project site. Weekly monitoring was performed to
evaluate the measured vibration and noise. When needed, mitigation
measures were recommended to reduce the amount of noise and vibration. A
weekly report was prepared and submitted to the MTA for review. The
development and execution of the monitoring and reporting program
allowed construction to be completed on time and the interference onto
the community to be minimized.
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