Res 00-312
RESOLUTION NO. 00-312
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF
FEDERAL WAY, WASHINGTON, REQUESTING PORT OF
SEATTLE AND FEDERAL AVIATION ADMINISTRATION
ACTION ON MODIFICATIONS TO EXISTING SOUTHBOUND
DEPARTURE FLIGHT TRACKS FROM SEATTLE- TACOMA
INTERNATIONAL AIRPORT.
WHEREAS, the Port of Seattle is conducting a noise evaluation under Federal
Aviation Administration ("FAA") regulations, to evaluate aircraft noise and possible measures to
alleviate it; and
WHEREAS, this evaluation, known as a Part ISO evaluation, has resulted in a series of
preliminary recommendations, including recommendations pertaining to sound attenuation for
multiple family and mobile homes, modifications to aircraft approach transition zones, and changes to
aircraft departure flight tracks; and
WHEREAS, there are several alternative preliminary recommendations concerning
modifications of departure flight tracks ftom Seattle-Tacoma International Airport ("SeaTac"),
including a "two track" and a "three track" alternative; and
WHEREAS, the City of Federal Way believes that communities should not be
protected ftom aircraft noise at the expense of other communities, upon whom the noise is
concentrated; and
WHEREAS, some of the preliminary recommendationsftomPart 150 Study appear to
demonstrate that modif'ying the existing southbound flight tracks can substantially decrease noise ftom
Res. fbo-31ZPage I
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existing flight patterns over the City of Federal Way, without resulting in substantial noise inaœses in
other communities; and
WHEREAS, the Federal Way City Council wishes to express its preference for such
alternative flight track modifications that accomplish this purpose;
NOW THEREFORE, THE CITY COUNCIL OF THE CITY OF FEDERAL WAY
HEREBY RESOL YES AS FOLLOWS:
Section 1. City of Federal Way Flight Track Modification Preferences.
The City of Federal Way prefers that flight tracks departing SeaTac Airport in a
southbound direction be modified as shown on Exhibit A hereto and as described below as follows:
A The"Elma" departure should be modified to direct planes to turn west at 2 DME
fi"om the Seattle VOR, and then fly over Puget Sound north of the City of Federal Way, rather than
turning at 5 DME and flying due west along S. 320th Street directly ovec the City of Federal Way.
B. The "Mountain" departure should be modified to direct planes to follow an angled
departure over the Kent Valley, before turning east bound, rather than turning at 5 DME east along S.
320th Street.
C. A new, late night track for 747s flying to Asia should be created. This new track
should be routed south and west following the 1-5 corridor, then turning west and/or north only over
the Port of Tacoma, rather than flying along S. 320th Street directly over the western half of the City
of Federal Way.
D.
Modified departure flight tracks and procedures should be charted and
documented to ensure that noise abatement flight tracks are properly implemented in such a way as to
reduce the possibility of stray aircraft and/or human error.
Res. #OO-31;!Page 2
Section 2. Reauested Port of Seattle and Federal Aviation Administration Action.
The City of Federal Way requests that the Port of Seattle work diligently with the
FAA to secure the FAA's agreement to implement the flight track changes outlined in Section I. The
City of Federal Way also directly requests that the FAA agree to implement such changes.
Section 3. Severability. If any section, sentence, clause or phrase of this resolution
should be held to be invalid or unconstitutional by a court of competent jurisdiction, such invalidity or
unconstitutionality shall not affect the validity or constitutionality of any other section, sentence,
clause or phrase of this resolution.
Section 4. Ratification. Any act consistent with the authority and prior to the
effective date of the resolution is hereby ratified and affirmed.
Section 5. Effective Date. This resolution shall be effective immediately upon passage
by the Federal Way City Council.
RESOLVED BY THE CITY COUNCIL OF THE CITY OF FEDERAL WAY,
WASHINGTON, this 18th day of April, 2000.
CITY OF FEDERAL WAY
~z~~ /;24
/"" MAYOR,MIKEPAfK /
~~~
APPROVED AS TO FORM:
Res. #OO-31~Page 3
~.
--:=::------- -
, LONDI K. LINDELL
FILED WITH THE CITY CLERK: 04/18/00
PASSED BY THE CITY COUNCIL: 04/18/00
RESOLUTION NO. 00-312
k:1reso1pt150
'r.
Res. # 00-31i'age 4
CITY OF FEDERAL WAY
PROPOSED SEATAC
SOUTH FLOW
FLIGHT TRACKS
Legend: c:==:J Federal Way City Limits
Ittf Flight Tracks c:==:J Federal Way PAA
."". Asia Night-time Flight Track EXHIBIT "A /(
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MEETING DATE: April 1 ii, 2000
ITEM#
CTTY OF FEDERAL WAY
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.�� � ")
City Council
AGENDA ITEM
SUBJECT: Seattle-Tacoma ("Sea-Tac") International Airport Part 150 Noise Study;
Part 150 Study Committee Recommendations on Flight Track Modifications
CATEGORY:
X CONSENT
_ORDINANCE
_BUSINESS
HEARING
— �'I'I
�RESOLUTION
_STAFF REPORT
_PROCLAMATION
STUDY SESSION
OTHER
BUDGET IlViPACT:
Amount Budgeted: $ 0
Eapenditure Amt: $ 0
Contingency Reqd: $ 0
ATTACHMENTS: March 21, 2000 City Council study session briefing memorandum dated March 10,
2000: draft resolution.
SUMMARYBACKGROUND: Preliminary recommendations on Sea-Tac southbound aircraft flight
departure route modifications are emerging from the current Part 150 Noise Study. Preliminary
recommendations appear to demonstrate that modifying the existing southbound flight tracks can
substantially decrease noise from existing southbound departure flight patterns over the City of Federal
Way, without resulting in substantial noise increases in other communities. Potential City Council actions
include: 1) take no action; 2) support the proposed study recommendations; 3) oppose the study
recommendations; 4) present alternative flight track modifications (staff recommendation). Attached is a
draft resolution supporting modifications to existing southbound depaiture flight tracks and recommending
minor adjustments to the proposed "three track" alternative.
CITY COUNCIL COMMITTEE RECOMII�NDATION: The City Council met in study session on
March 21, 2000 and placed this issue on the April 18, 2000 City Council agenda.
CITY MANAGER RECOMMENDATION: Motion to approve the attached resolution supporting
changes to the existing south flow Sea-Tac flight departure tracks.
APPROVED FOR INCLUSION IN COUNCIL PACKET:
(BE T O B E CO BY CTIY CLERKSf OFFICE)
COUNCIL ACTION:
_APPROVED
_DEIVIED
TABLED/DEFERRED/NO ACTION
COUNCIL BILL #
lst Reading
Enactment Reading
ORDINANCE #
RESOLUTION #
1
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DEPARTMENT OF COMI�TY DEVELOPMENT SERVICES
March 10, 2000
TO: Mayor Park and City Council Members
FR: Greg Fev�� Principal Planner
VIA: David Moseley, City Manager
RE: March 21, 2000 City Council Study Session:
Seattle-Tacoma International Airport Part 1 SO Noise Study;
Part ISO Committee Recommendations on Flight TrackModifications
PURPOSE OF BRIEFING
Brief City Council members on emerging Part 150 Noise Study Advisory Committee
recommendations for flight track modifications.
2. Present recommendations for City Council consideration on the proposed flight track
modifications.
BACKGROUND
A Part 150 Noise Study ("study") evaluates aircraft noise and land use measures intended to alleviate
noise impacts in surrounding communities. The study is guided by Federal Aviation Administration
("FAA") regulations. Completing the study provides Seattle-Tacoma International Airport
("SeaTac") with eligibility for federal funds to complete noise mitigation projects. The study deals
only with the current two-runway airport and does not consider noise impacts from a third runway.
The third runway will be addressed in subsequent studies.
A variety of recommendations are beginning to emerge from the study related to: sound attenuation
for multiple family and mobile homes; changing the noise remedy boundary; modifications to
approach transition zones; and, modifications to flight tracks. This briefing will focus specifically on
recommendations emerging on flight tracks modifications as they relate to Federal Way.
Flight track alternatives have been developed by means of an interactive process involving community
and technical participants serving on a Part 150 Study Advisory Committee, FAA, Port of Seattle
("POS") and its consultants. Lloyd Docter has been appointed as Federal Way's citizen
representative to the Citizen's Advisory Committee and Greg Fewins serves on the Technical
Advisory Committee. Together, these Committee's constitute the Study Advisory Committee
referenced in this memorandum.
• .
Prior to 1990, aircraft from SeaTac departed to the south in a dispersed or scatter pattern (refer to
exhibit A). Following the FAA's implementation of the "four post pattern" in 1990, departing aircraft
are now directed into more confined flight tracks (refer to exhibit B). This resulted in concentrations
of departing aircraft over Federal Way's most densely populated residential areas (e.g. 320�` Street
corridor).
The city has been working with FAA and POS staff for a number of years to evaluate potential
modifications to the four-post pattern to reduce impacts on Federal Way area residents. The issue
was eventually deferred to the Part 150 study. FAA is ultimately responsible to implement any
changes to flight tracks.
KEY TERMS
This memorandum refers to a variety of terminology and a series of attached map and graphic
exhibits. These exhibits reflect complex modeling results and without explanation may be difficult to
decipher. At the March 21 study session, staff will walk through an explanation of each e�ibit.
There are a number of inethods to evaluate and graphically depict aircraft noise impacts. The
following methodologies are depicted on the enclosed exhibits as referenced in the section titled
`Study Advisory Committee Recommendations'. A brief definition of each methodology is provided
to assist you in understanding the resulting impacts of the Advisory Committee recommendations.
Day/Night Level ("DNL'): Represents the 24-hour annual average noise level.
Single Event Sourrd Exposure Level ("SEL'): Describes the noise produced by one flight. This data
is used to predict areas encountering sleep interference.
Time Above ("TA'): Expresses the number of minutes above a certain noise level an area
experiences. This data is used as an indicator of areas of speech interference.
For each of these methodologies, noise impacts are depicted at various decibel levels resulting in a
noise contour map. As a point of reference, 80 decibels is equivalent to noise from a hair dryer, 70
decibels is equivalent to freeway traffic and 60 decibels is equivalent to conversation levels.
STUDY ADVISORY CONIlVIITTEE RECOMII�NDATIONS
There are two principal Study Advisory Committee recommendations on modifications to south flow
flight tracks. The alternative recommendations are described as two-track and thre�track proposals.
The two-track proposal separates a portion of south and eastbound flights from the Pacific H'ighway
corridor and directs them over the Kent/Auburn Valley. The three-track proposal includes the two-
track recommendation and separates a portion of south, west and northbound flights from the Pacific
Highway corridor and directs them over Des Moines and Puget Sound (refer to exhibit C).
For comparison purposes, the attached exhibits D, F and H depict the two-track proposal showing
DNL, SEL and TA, and exhibits E, G and I depict the same for the three-track proposal. Focusing
. •
only on impacts to the city and the city's potential annexation areas, using the DNL methodology,
noise impacts above 65 DNL are eliminated within the city and potential annexation area for both the
two and three-track proposals. Using the 85 SEL contour, two-track impacts are slightly increased
within the city and the city's potential annexation area. The three-track alternative significantly
expands the 85 SEL contour north of the city over Puget Sound. Using the 10 minute TA 65
contour, impacts within the city are significantly reduced, however impacts to the city's potential
annexation area are slightly increased. The three-track alternative increases 10 minute TA 65 contour
impacts over Puget Sound.
STAFF RECOMMENDATION
Following review of the Part 150 Study Advisory Committee recommendations by POS sta� a public
hearing will be scheduled on the study in late spring or early summer. The city has an opportunity
beginning now through the public hearing to provide the POS with comments and direction on the
proposed flight track modifications. The following outiines potential recommendations on the
proposed modifications:
1. Take no action;
2. Support the proposed Part 150 Study recommendations;
3. Oppose the proposed Part 150 Study recommendations;
4. Present city recommendations on alternative flight track modifications (staff
recommendation).
Attached is a draft resolution for City Council consideration. The resolution supports the need for
modifications to flight tracks but identifies preferable flight track alignments (recommendation 4
above). These alternative flight track alignments would further reduce impacts to the city and PAA,
while minimizing impacts to adjacent jurisdictions. An explanation ofthe details ofthis resolutionwill
be provided at the City Council study session.
:11
A March 22, 1989 South Flow Flight Track Plot
B 7une 30, 1993 South Flow Flight Track Plot
C Summary of Flight Track Alternatives
D Two-Track Annua165 DNL Contour
E Three-Track Annual 65 DNL Contour
F Two-Track 85 SEL Contour
G Three-Track 85 SEL Contour
H Two-Track 10 Nlinute TA 65 Contour
I Three-Track 10 Minute TA 65 Contour
7 Draft Resolution
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RESOLUTION NO.
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A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF
FEDERAL WAY, WASHINGTON, REQUESTING PORT
OF SEATTLE AND FEDERAL AVIATION ADMINISTRATION
ACTION ON MODIFICATIONS TO EXISTING SOUTHBOUND
TAKEOFF FLIGHT TRACKS FROM SEATTLE- TACOMA
INTERNATIONAL AIRPORT.
WHEREAS, the Port of Seattle is conducting a noise evaluation under Federal
Aviation Administration ("FAA") regulations, to evaluate aircraft noise and possible measures to
alleviate it; and
WHEREAS, this evaluation, known as a Part 150 evaluation, has resulted in a series
of preliminary recommendations, including recommendations pertaining to sound attenuation for
multiple family and mobile homes, modifications to aircraft approach transition zones, and changes
to aircraft takeoff flight tracks; and
WHEREAS, there are several alternative preliminary recommendations concerning
modifications of takeoff flight tracks from Seattle-Tacoma International Airport ("SeaTac"),
including a"two track" and a"three track" alternative; and
WHEREAS, the City of Federal Way believes that communities should not be
protected from aircraft noise at the expense of other communities, upon whom the noise is
concentrated; and
WHEREAS, some of the preliminary recommendations from Part 150 Study appear
to demonstrate that modifying the existing southbound flight tracks from can substantially decrease
Res. # , Page 1 ���"���� �
PAG �...�1.�..C�.�..�...
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noise from existing flight patters over the City of Federal Way, without resulting in substantial noise
increases in other communities; and
WHEREAS, the Federal Way City Council wishes to express its preference for such
alternative flight track modifications that accomplish this purpose;
NOW THEREFORE, THE CITY COUNCIL OF THE CITY OF FEDERAL WAY
HEREBY RESOLVES AS FOLLOWS:
Section 1. Citv of Federal Wav Fli�ht Track Modification Preferences.
The City of Federal Way prefers that flight tracks departing SeaTac Airport in a
southbound direction be modified from the current "four post" pattern as follows:
A. The"Elma" departure should be modified to direct planes to turn west at 2 DME,
and then fly southwesterly over Puget Sound, north of the City of Federal Way, rather than turning
at 5 DME and flying due west along S. 320` Street directly over the City of Federal Way.
B. The "Mountain" departure should be modified to direct planes to follow an angled
departure over the Kent Valley, before turning east bound, rather than turning at 5 DME east along
S. 320"' Street.
C. A new, late night track for 747s flying to Asia should be created. This new track
should be routed south and west following the I-5 corridor, then turning west and/or north only over
the Port of Tacoma, rather than flying along S. 320`'' Street directly over the western half of the City
of Federal Way.
D. Modified departure flight tracks should be specified by fixed orientation points,
rather than solely according to elevation, to reduce the possibility of stray aircraft and/or human
error.
Res. # , Page 2
�
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Section 2. Requested Port of Seattle and Federal Aviation Administration Action.
The City of Federal Way requests that the Port of Seattle seek authorization for the
flight track changes outlined in Section 1 above from the FAA, and that the Port pursue such
authorization with all available resources. The City of Federal Way also requests that the FAA
promptly grant such authorization.
Section 3. Severabilitv . If any section, sentence, clause or phrase of this resolution
should be held to be invalid or unconstitutional by a court of competent jurisdiction, such invalidity
or unconstitutionality shall not affect the validity or constitutionality of any other section, sentence,
clause or phrase of this resolution.
Section 4. Ratification. Any act consistent with the authority and prior to the
effective date of the resolution is hereby ratified and affirmed.
Section 5. Effective Date. This resolution shall be effective immediately upon
passage by the Federal Way City Council.
RESOLVED BY THE CITY COUNCIL OF THE CITY OF FEDERAL WAY,
WASHINGTON, this day of , 2000.
CITY OF FEDERAL WAY
MAYOR, MIKE PARK
ATTEST:
CITY CLERK, N. CHRISTINE GREEN, CMC
Res. # , Page 3
�
APPROVED AS TO FORM:
CITY ATTORNEY, LONDI K. LINDELL
FILED WITH THE CITY CLERK:
PASSED BY THE CITY COUNCIL:
RESOLUTION NO. '
k:\reso\pt 150
�� �`�` a , :�.
Res. # , Page 4