14 cfr part 150 noise exposure map update san antonio … · 2020. 10. 19. · aircraft noise...
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14 CFR PART 150 NOISE EXPOSURE MAP UPDATE
SAN ANTONIO INTERNATIONAL AIRPORT
PUBLIC WORKSHOP
OCTOBER 2020
Part 150 requires that members of the public have the opportunity to participate in the process, including providing comments
Overview – What is Part 150?
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*SAT’s current Part 150 Study only involves updating the NEMs and will help determine if a future NCP update is warranted
Established in 1985, Title 14 Code of Federal Regulations Part 150 (14 CFR Part 150, or “Part 150”) provides a process for airport operators to address compatibility of aircraft operations with surrounding communities
Part 150 establishes the methodology to be followed when preparing aircraft noise exposure maps (NEMs) and developing airport/airport environs noise compatibility programs (NCPs)*
Part 150 is a voluntary process that helps airport operators become eligible for federal grant funds for approved airport noise programs
Overview – Part 150 NEM Update Study Goals and Objectives
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Determine existing and future noise
exposure and identify
noncompatible land uses
Identify areas of noncompatible noise exposure
and their potential
eligibility for noise
mitigation*
Educate community and stakeholders on
existing noise program and
regulatory environment
Enhance community
relationships through
transparency
Secure NEM finding of
compliance from the
Federal Aviation Administration
(FAA)
*The 2021 Baseline/Existing Conditions noise contours presented here will not be used to determine eligibility for future noise mitigation. Eligibility will be determined
using the 2026 Future Conditions noise contours, which will be presented to the public for review in early 2021.
Overview – Regulation of Airport Noise
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Federal Aviation Administration
Local Governments and States
Airport Operators/SAT
Framework Stakeholders
Federal law sets aircraft noise standards, prescribes operating rules, establishes the compatibility planning process, and limits an airport’s ability to restrict aircraft operations
State law sets forth compatibility planning guidelines and noise standards, but aircraft are exempt
Local noise ordinances set noise standards and provide for compatible land use planning, but aircraft are exempt
The FAA: (1) Controls aircraft while in flight; (2) Responsible for controlling noise at its source (i.e., aircraft engines); (3) Certifies aircraft and pilots
Local Governments and States: (1) Promote compatible land use through zoning; (2) Require real estate disclosure; (3) Mandate sound-insulating building materials
Airport Operators (SAT): (1) Very limited authority to adopt local restrictions; (2) Responsible for capital improvement projects and infrastructure
Overview – Noise Exposure Maps
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A noise contour depicts levels of equal aircraft noise exposure surrounding an airport
Part 150 requires documentation of the Day-Night Average Sound Level (DNL) 65, 70, and 75 contours
The Federal Aviation Administration considers all land uses to be compatible with aircraft noise below the DNL 65 contour
NEMs reflect the DNL contours presented over land use base maps
Overview – Noise Exposure Maps
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For this Part 150 Study, 2019 Airport operations were used to represent the 2021 Baseline operations. In consultation with the FAA, it was assumed that no growth in aircraft operations occurred between 2019 and 2021, given the global slowdown in aviation activity due to the COVID-19 pandemic
Base maps depict an airport’s layout, local land use control jurisdictions, major land use categories, noise-sensitive “receptors” and other information required by Part 150
Part 150 requires NEMs for the year of FAA submittal and a 5-year forecast; as such, this NEM Update will develop noise contours for:• 2021 Baseline Year• 2026 Future Conditions Year
Land use categories in this Part 150 Study reflect current and future development patterns around SAT
Overview – Noise Exposure Map Update Study Process
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24-hour time-weighted energy average noise level based on A-weighted decibels (dBA), which correlates well with the human hearing response
Physics of Noise – Day-Night Average Sound Level
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Average Annual Day aircraft noise exposure is calculated over a broad area and then depicted using contour lines of equal noise levels
Noise occurring between 10 p.m. and 7 a.m. is weighted by an additional 10 dB to account for the higher sensitivity to noise during nighttime hours and for the expected further decrease in background levels that typically occur in the nighttime
Reflects cumulative average day noise exposure for the purposes ofdetermining overall compatibility – not noise generated by a single event
The decibel (dB) is the unit used to describe sound pressure level and when expressed in dBA, it is weighted to account for human hearing
Physics of Noise – Understanding Sound Levels
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Maximum A-Weighted Sound Level (Lmax) is the maximum, or peak, sound level during a noise event
Sound Exposure Level (SEL) is a time integrated measure, expressed in decibels, of the sound energy of a single noise event at a reference duration of one second
Equivalent Noise Level (Leq) is the “energy” average noise level during the time period of the sample
DNL is expressed in dBA and represents the noise level over a 24-hour period
Physics of Noise – Cumulative Noise Exposure
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DNL represents cumulative noise exposure; therefore, a single loud (high SEL) noise event that occurs each day can have the same DNL level as multiple, quieter (low SEL) noise events over the same period of time
Noise Modeling – Methodology
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Inputs
Aviation Environmental
Design Tool Version 3c
Modeling Program
Noise Contour Results
Time of Day
Detailed Operations and
Fleet Mix
Runway Utilization
Meteorological conditions
Flight Track Locations and
Use
Terrain
Stage Length
Aircraft noise modeling allows
Noise Modeling – The Basics
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The Aviation Environmental Design Tool (AEDT) replaced the Integrated Noise Model (INM) when it was released
in 2015. The current version, AEDT 3c, will be
used for this Part 150 Study
Calculation of noise exposure throughout the
community
Depicting annual average aircraft noise
exposure
Predicting future aircraft
noise exposure
Assessing changes in noise impacts resulting
from runway configuration
changes
Assessing changes in fleet
mix and/or number of operations
Evaluating changes in operational procedures
The 14 CFR Part 150 process is the Airport’s mechanism to improve the compatibility between the Airport and surrounding communities
Compatible Land Use Planning
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Allows for the adoption of appropriate local
land use standards for land use compatibility
planning purposes
Deems levels below DNL 65 to be
compatible with all land uses
Table 1 in Appendix A of 14 CFR Part 150 provides regulatory
guidelines fornoise and
land use compatibility
2021 Baseline Land Use Map
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Please visit the Noise Office website for an opportunity to review this map as well as other materials associated with the NEM Update
Bexar County Appraisal District
2021 Baseline Land Use Map -- Data Sources
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Existing Land UseConvalescent\Nursing Facilities
Hospitals Places of Worship
National Park Service
City of San AntonioCity Corporate BoundaryHistoric DistrictsLocal Historic Landmarks
Park Boundaries Streets
Bexar County GIS Libraries Schools
Historic Resources (National Register)
San Antonio River Authority
Texas Historical Commission
U.S. Census Bureau
U.S. Geological Survey
Existing Land Use (supplemental)Future Land Use
Military Installations Suburban City Limits
State Historic Landmarks
County Boundaries Highways and Major Roads
Rivers and Streams Water Bodies
SAT’s Noise Program
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2009 2012 2015 2017 2020
Part 150 Study NEM Update
Part 150 Study NEM and NCP Update
Current Part 150 NEM Update
Obtained AvigationEasements
New Noise Monitoring System Installed
1991
First Part 150 Study
Accepted by FAA and Noise
Program Begins at SAT
Established: Noise Abatement Officer, Noise
Abatement Advisory Committee, and Pilot Advisory Committee
Noise Complaint Monitoring Program
Urge greater use of Stage 3 aircraft Land Use and Zoning Plan Voluntary Use Noise Abatement
Departure Procedure Restrictions on Nighttime Engine
Run-ups Acoustical Treatment for Public
Buildings Real Estate Noise Disclosure
Part 150 Study NEM and NCP Update Residential
Acoustical Treatment Program (RATP) (2006 –2020)
GRE constructed
Part 150 Study NCP Update Ground Run-
Up Enclosure (GRE) recommended to reduce noise related to engine run-ups
Permanent noise monitoring system
1997
2002
SAT’s Noise Program
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Sample Flight Tracks Over SAT
NOMS allows the Airport community to… View actual flight tracks and noise levels File noise complaints Understand flight patterns
12 permanent noise monitoring terminals (NMT) located around the Airport
Analyze flight tracks, complaints and noise levels
Noise data integrated with FAA air traffic control tower radar data
Noise and Operations Monitoring System (NOMS)
More information can be found at:https://flysanantonio.com/business/about-saas/environmental-stewardship/noise-programs/
Noise Monitoring Terminal Locations
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2021 Annual Aircraft Operations
2021 Baseline - Aircraft Operations and Time of Day
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2021 Annual Aircraft Operations by Time of Day
Aircraft Category Operations
Widebody 4,287
Narrowbody 83,886
Regional Jet 20,666
Business Jet 26,756
Turboprop 15,301
Prop 10,219
Helicopter 2,756
Total 163,870Note: An aircraft operation is equal to one arrival/landing or one departure/takeoff.The total number does not add up due to rounding.Source: SAT, 2019. Environmental Science Associates, 2020.
Arrivals Departures
Day Night Day Night82.74% 17.26% 83.99% 16.01%
Note: An aircraft operation is equal to one arrival/landing or one departure/takeoff.Source: SAT, 2019. Environmental Science Associates, 2020.
2021 Baseline - Aircraft Departure Stage Length
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Stage Length
Category
Departure Route Length (nautical
miles)
Departures fromSAT
1 0 - 500 55.455%
2 501 – 1,000 32.855%
3 1,001 - 1,500 10.935%
4 1,501 - 2,500 0.733%
5 2,501 - 3,500 0.001%
6 3,501 - 4,500 0.016%
7 4,501 - 5,500 0.004%
8 5,501 - 6,500 0.002%Source: Environmental Science Associates, 2020.
Note: Values may not add to 100% due to rounding. No aircraft flew a departure stage length greater than 8.
Aviation Environmental Design Tool (AEDT) Departure Stage Length Categories Stage Length Comparison for Boeing 747-400
Stage length is the distance an airplane flies directly from one airport to another
2021 Baseline – Daytime Runway Utilization
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2021 Baseline – Nighttime Runway Utilization
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2021 Baseline - AEDT Flight Tracks – Runway 4
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Draft for deliberative purposes only and subject to change
2021 Baseline - AEDT Flight Tracks – Runway 22
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Draft for deliberative purposes only and subject to change
2021 Baseline - AEDT Flight Tracks – Runways 13L and 13R
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Draft for deliberative purposes only and subject to change
2021 Baseline - AEDT Flight Tracks – Runways 31L and 31R
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Draft for deliberative purposes only and subject to change
2021 Baseline - DNL 65, 70, and 75 Contours
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The draft 2021 Baseline noise contours are for deliberative purposes only, are subject to change, and will not be used to determine eligibility for future noise mitigation efforts
2014 Baseline and 2021 Baseline DNL 65 Contours
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The draft 2021 Baseline DNL 65 contour is for deliberative purposes only, is subject to change, and will not be used to determine eligibility for future noise mitigation
efforts
Next Steps
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Review community stakeholder comments relative to the assumptions used in the noise modeling
Identify populations and noise-sensitive structures located within the DNL 65 contour
Develop the 2026 Future Conditions airport activity forecast and the 2026 Future Conditions noise contours
Conduct 2nd
Public Workshop
Prepare and circulate the Noise Exposure Map Update Report for public review
Submit NEM Update Report to the FAA
Spring 2021Early 2021
Early 2021Late 2020
Fall 2020Fall 2020
All formal comments on the NEM Update effort will become part of the official study record and must be submitted to the SAT Noise Office by 5pm November 13, 2020, via either email or regular mail.
Email (submitted by 5pm):
Regular Mail (postmarked by 5pm):
San Antonio International Airport457 Sandau RoadBuilding 1039Attn: Environmental StewardshipSan Antonio, TX 78216
Comments or Questions?
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