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What
is a FAR Part 150 study?
The
full name of the study is the Federal Air Regulation
Part 150 Noise Exposure and Land Use Compatibility
Study. Created in 1984 in compliance with the
Aviation Safety and Noise Abatement Act of 1979
(ASNA), the FAR Part 150 Noise Study specifies
a nationally uniform system of accessing an
airport's noise impact and describes a land
use compatibility criteria. Local values and
factors may influence these criteria. The study
also provides technical assistance in preparing
and executing noise compatibility planning and
implementation programs.
The study will consider and evaluate programs
to reduce the impact of airport noise on areas
around the Guam International Airport. It will
identify existing noise levels and predict noise
levels in the future. The study will also consider
noise abatement programs and land use alternatives
that can realistically be expected to reduce
the effect of airport noise on the surrounding
areas.
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What
topics will the Part 150 study include?
There
are twelve basic elements of the study:
1.
Study Mobilization
2. Public Involvement
3. Evaluation of Existing Conditions
4. Noise Measurements and Evaluation
5. Forecasts of Aviation Activity
6. Existing Noise Exposure
7. Future Baseline Noise Exposure
8. Existing and Future Noise Impacts
9. Future Noise Compatibility Alternatives
10. Future Land Use Alternatives
11. Recommended Noise Compatibility Plan
12. GIAA Commission and FAA Approval
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What
products will the Part 150 Study produce?
The
FAR Part 150 Noise Study requires two types
of documents that must be submitted to the Federal
Aviation Administration (FAA) for approval of
the Airport's program - a Noise Exposure Map
(NEM) and the Noise Compatibility Program (NCP).
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What
is a Noise Exposure Map (NEM)?
Noise
exposure maps illustrate where aircraft noise
occurs in and around the airport and at what
sound level. They illustrate the locations surrounding
the airport that are affected by significant
noise and the expected annual day-night average
sound levels.
Noise Exposure Maps are developed using a specialized
computer model developed by the Federal Aviation
Administration known as the Integrated Noise
Model, or INM. Often called "contour"
maps, because they define contours of noise
impact around the airport, these maps show where
noise is experienced and at what levels. The
FAA requires the consideration of "significant"
noise levels, defined as aircraft noise levels
of DNL 65 to 75 in the environs of airports.
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What is
Day-Night Average Sound Level?
DNL
is the average noise level over a 24-hour period,
including an artificial increase of 10-dB between
the hours of 10 p.m. and 7 a.m. to account for
lower background sound levels at night.
The 24-hour average sound level, including this
10-dB penalty, is known as the day-night average
sound level (abbreviated DNL). The 10-dB penalty
means that one nighttime sound event is equivalent
to 10 daytime events of the same level.
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What
is the Integrated Noise Model?
The
Integrated Noise Model, or INM, has been the
FAA's standard tool since 1978 for determining
the predicted noise impact in the vicinity of
airports. The model uses flight track information,
aircraft fleet mix, standard and user defined
aircraft profiles, and terrain as inputs.
The INM produces noise exposure contours that
are used for land use compatibility maps. The
INM is an average-value-model and is designed
to estimate long-term average effects using
average annual input conditions.
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What
is a Noise Compatibility Program (NCP)?
The Noise Compatibility
Program evaluates and recommends various noise
abatement and land use mitigation measures to
reduce noise impacts and ensure land use compatibility
within the vicinity of the airport.
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Why
is Guam International Airport Authority (GIAA)
conducting the Part 150 Noise Study?
As
GIAA continues to grow its passenger traffic
and expand its cargo handling, increased airport
noise may be associated with this growth. GIAA
is undertaking a FAR Part 150 Noise Study with
the goal of achieving and maintaining a maximum
degree of noise compatibility between the airport
and its surrounding areas, while taking into
account the requirements of the national aviation
system.
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How do
I participate in the FAR Part 150 Noise Study?
The FAR Part 150 Noise
Study has an extensive public participation
process with committees, meetings, and a public
hearing, as well as a variety of information
materials including this website.
There
has been two committees set up for the study:
a Community Advisory Team and a Technical Advisory
Group. Anyone is invited to join the Community
Advisory Team, or attend Technical Advisory
Group meetings and the public hearing.
A Public Involvement Plan detailing opportunities
for involvement is included in this website
and can be reviewed in the "Reports"
section.
Comments
can also be emailed to
noise@pcrguam.com
or called in to our hotline at 642-4500.
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