COMMISSION 
AGENDA MEMORANDUM                        Item No.          9B 
BRIEFING ITEM                             Date of Meeting        July 9, 2019 
DATE:     June 17, 2019 
TO:        Stephen P. Metruck, Executive Director 
FROM:    Jeffrey Brown, Director of Aviation Facilities and Capital Programs 
Wayne Grotheer, Director Aviation Project Management 
SUBJECT:  Aviation Capital Project Planning and Preliminary Design - Briefing 
Amount of future request:                $10,000,000 
Total estimated project cost:                       TBD 
EXECUTIVE SUMMARY 
The purpose of this briefing is to provide an overview of the planning process and to articulate
the need to conduct scope/project definition and preliminary design necessary to ensure the
capital projects described in this briefing meets the project objectives. A future authorization
request not to exceed $10 million will be submitted to the Commission for project definition
and preliminary design-at-risk on Sustainable Airport Master Plan (SAMP) Near-Term Projects. 
Separately, there will a future authorization request for contracting capacity to do project
definition and preliminary design for SAMP roadway projects. 
The future authorization request is scheduled for the next Commission meeting and is inclusive
of funding for preliminary design of the five identified projects listed below in "Details" and
potential additional projects anticipated to be identified through continued advanced planning. 
Authorization will also be sought at that time to enter into reimbursable agreements with the
Federal Aviation Administration (FAA) in relation to relocation of the Runway 34R glideslope
antenna as part of the Taxiway A/B Extension project. 
Staff briefed the Aviation Committee on this subject June 14, 2019 and will continue to
coordinate with the Aviation Committee and will provide written updates to the Commission on
the progress of these projects to include additional projects added, as requested by the
Commission. 
The $10 million is included in the 2019-2023 capital budget under the line item "SAMP
Preliminary Planning/Design." The total for this five-yearline item is $300,000,000, which is
included in the current Signatory Lease and Operating Agreement with the Airlines. 


Template revised April 12, 2018.

COMMISSION AGENDA  Briefing Item No. __9B__                             Page 2 of 6 
Meeting Date: July 9, 2019 
JUSTIFICATION 
Project definition and preliminary design of capital projects supports the following Century
Agenda strategic goals and objectives: 
1)  Advance this region as a leading tourism destination and business gateway 
a.  Meet the region's air transportation needs at the Airport for the next 25 years
and encourage the cost-effective expansion of domestic and international
passenger and cargo service 
2)  Be the greenest and most energy efficient port in North America 
a.  Reduce air pollutants and carbon emissions 
Timely and comprehensive information is critical at the preliminary design stage to provide 
decision makers and project teams information necessary to transition into design. While still
considered conceptual in nature, this more detailed information is compiled in a Project
Definition  Document  (PDD)  and  goes  beyond  the  planning  level  to  provide  more 
certainty/confidence in: project definition; risks and opportunities; linkages to other projects
and actions; and project schedule and cost estimate. Timely design for these early SAMP Near-
Term Projects will ensure that the Port is prepared to initiate construction as soon as possible
following completion of the environmental review and granting of required approvals. 
DETAILS 
The upcoming authorization request supports only the initial phase of project definition and
preliminary design exclusively for projects included in the SAMP Near-Term Projects. Design of
any project beyond preliminary design will require additional Commission approval. Project
definition and preliminary design would progress at risk as work beyond preliminary design is
contingent on the outcome of the environmental review process which is currently underway. 
At this time, five projects have been identified as needing preliminary design over the next
several months in order to complete these projects within the timeframe proposed. These five
projects are included in the SAMP Near-Term Projects: 1) Westside Maintenance Campus, 2)
Airport Rescue and Firefighting Facility (ARFF), 3) Roadway Improvements, 4) Taxiway A/B
Extension, and 5) Main Terminal North GT Lot. 
The Taxiway A/B Extension project requires relocation of the Runway 34R glideslope antenna
which will enable a potential adjustment of the slope angle to three degrees or more.
Increasing the slope angle enables higher aircraft elevation on approach and is supported by
the communities represented on the Sea-Tac Stakeholder Advisory Round Table (StART). The
glideslope antenna is an FAA navigational aid, and as such, relocation requires design and
construction by the FAA with financial reimbursement by the Port. Commission authorization
to enter into reimbursable agreements with the FAA will be included in the future authorization
request. 


Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Briefing Item No. __9B__                             Page 3 of 6 
Meeting Date: July 9, 2019 
The five SAMP Near-Term Projects listed below were identified as needing preliminary design
over the next several months and currently are, or have recently been, the subject of advanced
planning.  The future authorization request is inclusive of funding for project definition and
preliminary design of the five identified projects and potential additional projects anticipated to
be identified through continued advanced planning related to the SAMP Near-Term Projects.
No capital funds authorized under this future funding request will be spent on project definition
and preliminary design for projects that are not included in the SAMP Near-Term Projects. A
brief description of why staff believes it is in the public interest to conduct preliminary design
on the five projects is included below and a schedule of design and construction with project
linkages is included in the attached PowerPoint presentation. 
Westside Maintenance Campus: The Port's Maintenance Facility was constructed in
1969 as a mail sortation facility. It is undersized for its current function, is in a state of
disrepair, and is proposed to be relocated to clear the site for potential future hardstand
construction identified in the SAMP Near-Term Projects.
Airport Rescue & Firefighting Facility (ARFF): The ARFF was constructed in 1979. It is
undersized for its current function, is in a state of disrepair, and is proposed to be
relocated to clear the site for potential future gate construction identified in the SAMP 
Near-Term Projects.
Roadway Improvements: The southbound lanes of the North Airport Expressway are 
proposed to be relocated to continue the congestion relief initiated with the Widen
Arrivals Approach project and to clear the site for potential airfield expansion and gate
construction identified in the SAMP Near-Term Projects. 
Taxiway A/B Extension: Extension of dual taxiways at the south end of the airfield will
increase operational efficiency and reduce aircraft delay. The extension requires 
relocation of the Runway 34R glideslope antenna which would enable an adjustment of
the slope angle to increase aircraft elevation on approach, as recommended by the
StART Working Group. 
Main Terminal North GT Lot: The proposed multistory building could include functions
such as airline/airport support space that could be relocated from the existing terminal
to free up space for more critical passenger processing functions.  A more detailed
understanding of the building footprint and sublevels is also required to inform design
of the adjacent Widen Arrivals Approach project which will require utility relocations
through and adjacent to the site. 




Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Briefing Item No. __9B__                             Page 4 of 6 
Meeting Date: July 9, 2019 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
Alternative 1  No capital funds approved for project definition and preliminary design 
Cost Implications: $0 
Pros: 
(1)   No capital funds expended for this purpose in the short-term 
Cons: 
(1)   Detailed project information would not be available to the Commission to enable
timely decisions regarding potential design authorization.
(2)   Delay in design would delay potential project implementation that could proceed if
approvals are granted through the environmental review process. 
(3)   Would require increased short-term capital investment is existing facilities. 
This is not the recommended alternative. 
Alternative 2  Capital funds approved for project definition and preliminary design 
Cost Implications: $10,000,000 
Pros: 
(1) Provides detailed project information to the Commission to enable timely decisions
regarding potential design authorization. 
(2) Timely project design will enable potential project implementation that could proceed if
approvals are granted through the environmental review process. 
Cons: 
(1)   Capital funds expended in the short-term 
(2)   Capital funds would need to be expensed if approvals are not granted through the
environmental review process and projects are not implemented 
This is the recommended alternative. 
FINANCIAL IMPLICATIONS 
Cost Estimate/Authorization Summary               Capital        Expense           Total 
COST ESTIMATE 
Original estimate                                         TBD               $0             TBD 
Cost increase 
Revised cost estimate 
Potential future scope/cost increase                     TBD                              TBD 
AUTHORIZATION 
Previous authorizations                                   $0               $0               $0 
Current request for authorization               $10,000,000               $0     $10,000,000 
Total authorizations, including this request      $10,000,000               $0     $10,000,000 
Remaining amount to be authorized                   TBD                           TBD 

Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Briefing Item No. __9B__                             Page 5 of 6 
Meeting Date: July 9, 2019 

Annual Budget Status and Source of Funds 
The $10,000,000 capital funds request is included in the 2019-2023 capital budget under the
line item "SAMP Preliminary Planning / Design". Funding for 2019 and 2020 for this line item is
$2,000,000 and $9,500,000 respectively.  A single CIP in the capital budget comprises the
entirety of the SAMP Near-Term Projects and to which the preliminary design costs would be
allocated. (C801109) The funding source will be the Airport Development Fund. There is a risk
that all or a portion of these funds could be expensed if any of the respective projects are not
constructed. 
ADDITIONAL BACKGROUND 
Master planning takes a broad view of facilities in all key functional areas of the Airport and 
involves alternatives analysis for major plan elements at a macro level. The result is a plan for
phased improvements required to satisfy demand forecast to a 20-year planning horizon. The
established Long-Term Vision is documented conceptually on the Airport Layout Plan (ALP) and
serves  to  guide  near-term  project  development  but  is  subject  to  further  study  and
environmental review.   Master planning also includes a more detailed study of projects
required to satisfy near-term demand in areas such as phasing, project definition, and financial
feasibility. 
Planning for the Port's Sustainable Airport Master Plan (SAMP) concluded in May 2018 when
documentation was finalized, and Port staff briefed the Commission. The SAMP documentation
serves as the official narrative to the ALP which was conditionally approved by the FAA in
November of 2018. Final approval of the ALP is dependent on completion of the environmental
review of the SAMP Near Term Projects`. 
Advanced planning involves more detailed planning in focus areas of the SAMP Near-Term
Projects as well as existing facilities. Advanced planning studies typically involve one or more of
the following: site planning to allocate space and determine an optimal configuration of
multiple facilities on a campus; analysis within individual projects to develop and evaluate 
alternative  configurations  of  key  elements  of  a  single  facility;  and  phasing  plans  for
improvements within a campus or individual facility. 
Port staff initiated advanced planning in early 2017 and have concluded  several studies,
including the Main Terminal Optimization Plan. Site planning for the Westside Maintenance
Campus and the ARFF facility in the general aviation area are currently underway. 
Capital funds are required once a project has been clearly identified through advanced planning
- i.e. alternatives analysis and site planning have determined an optimal configuration of an
individual  facility.   It  is  at  this  point  that  preliminary  design  is  initiated  and  program
development for the project begins. 

Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Briefing Item No. __9B__                             Page 6 of 6 
Meeting Date: July 9, 2019 
ATTACHMENTS TO THIS REQUEST 
(1)   Project PowerPoint Presentation 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
February 26, 2019  Commission Briefing: "Sustainable Airport Master Plan (SAMP)
Near-Term Projects (NTP) Environmental Review Briefing  Scoping Report" 
May 8, 2018  Commission Briefing: "Sustainable Airport Master Plan (SAMP) Planning
and Environmental Update" 
February 27, 2018  Commission Action: "Sustainable Airport Master Plan (SAMP)
Request for Additional Funds" 
February 13, 2018 - Commission Briefing: "Sustainable Airport Master Plan (SAMP)
Planning Update" 
August 23, 2016 -  Commission Briefing: "Sustainable Airport Master Plan  (SAMP)
Planning Update" 
July 12, 2016 - Commission Briefing: "Sustainable Airport Master Plan (SAMP) Planning
Update" 
April 12, 2016 - Commission Briefing: "Sustainable Airport Master Plan (SAMP) Planning
Update" 
January 26, 2016 -  Commission Briefing: "Sustainable Airport Master Plan (SAMP)
Planning Update" 
September 8, 2015 - Commission Briefing: "Sustainable Airport Master Plan (SAMP)
Planning Update" 
April 28, 2015 - Commission Briefing: "Sustainable Airport Master Plan (SAMP) Planning
Update" 
March 24, 2015 - Commission Briefing: "Briefing on Sea-Tac Cargo as part of the
Sustainable Airport Master Plan (SAMP)" 
January 27, 2015 -  Commission Briefing: "Sustainable Airport Master Plan (SAMP)
Planning Update" 
October 7, 2014 -  Commission Briefing: "Sustainable Airport Master Plan (SAMP)
Forecast and Facilities Challenges" 
March 11, 2014 - Commission authorization to amend the existing Sustainable Airport
Master Plan (SAMP) service agreement with Leigh Fisher Associates for IAF-related
planning tasks for an increase of $3,650,000 and a new total contract amount of
$9,650,000 
September 5, 2012 - Commission authorization for SAMP development and to advertise
and execute a contract for consulting services for the SAMP, with a total estimated
value of $6 million 
August 14, 2012 - Commission deferred consideration of a request to approve funding
for the Sustainable Airport Master Plan (SAMP) 
June 27, 2012 - Commission Briefing: "Terminal Development Challenges" 


Template revised September 22, 2016; format updates October 19, 2016.