COMMISSION 
AGENDA MEMORANDUM                        Item No.         6i 
ACTION ITEM                            Date of Meeting        July 14, 2020 
DATE:     July 6, 2020 
TO:        Stephen P. Metruck, Executive Director 
FROM:    Eileen Francisco, Acting Director, Aviation Facilities and Capital Programs 
Wayne Grotheer, Director, Aviation Project Management Group 
Stuart Mathews, Director, Aviation Maintenance 
SUBJECT:  Satellite Transit System (STS) Controls Renewal and Replacement Project Design
Authorization (CIP #801043) 
Amount of this request:          $8,775,000 
Total estimated project cost:      $65,000,000 to $95,000,000 
ACTION REQUESTED 
Request Commission authorization for the Executive Director to (1) execute a contract for design
as well as automated people mover consulting services, (2) complete design, and prepare
construction and purchasing bid documents, and (3) use Port crews , in support of the STS
Controls Renewal and Upgrade project (CIP #801043) at the Seattle-Tacoma International Airport
(SEA). The amount of this request is $8,775,000 for a total estimated project cost of $65,000,000
to $95,000,000. 
EXECUTIVE SUMMARY 
The Satellite Transit System (STS) transports passengers to and from the North and South
Satellites. This project is a renewal and replacement of the STS's Automated Train Control (ATC)
system. The current ATC system is 20 years old and is at the end of its useful life. This project
installs new STS network infrastructure, replaces end of life ATC systems equipment, and updates
the ATC with the most current version of the manufacturer's controls software while maintaining
passenger service to the North and South Satellites. 
This authorization allows for the selection and award of an Automated People Mover (APM)
consultant contract, the design of a new hardened STS fiber optic network, and the preparation
of documents necessary for the procurement, installation and testing of new ATC equipment.
After finalizing equipment requirements, and revised estimates, staff will return to Commission
for authorization to execute construction and goods and services contracts. 


Template revised January 10, 2019.

COMMISSION AGENDA  Action Item No. 6i                                    Page 2 of 6 
Meeting Date: July 14, 2020 
The STS Controls Renewal and Replacement Project (CIP 801043) is included in the 2020-2024 
capital budget and plan of finance. The project was approved on the 2020 #2 Majority-In-Interest
(MII) ballot.
JUSTIFICATION 
This project provides important benefits for continued operations, security, and safety. 
The STS is the primary conveyance method to move passengers efficiently to and from the Main
Terminal to the thirty-five gates in the North and South Satellites. In 2019, the STS carried
approximately 28 million passengers. The last major STS upgrade was completed in 2003 under
CIP #100783. The current ATC subsystem was installed around 2001 and major components are
now either obsolete or at the end of their useful life. The ATC system is an integrated set of 
computerized hardware, software and networks that safely operate the automatic movements
of the train system. The STS will cease to operate without a functioning ATC. Key suppliers and 
repair  facilities  have  indicated  that  remaining  repair  inventories  are  no  longer  being
manufactured and will be gone within a few years. Action is required now to ensure the STS
remains operational before more critical pieces of the ATC become obsolete or irreparable. A
catastrophic failure or even a prolonged failure of the STS would significantly impact operations 
at the Airport.
In addition to the obsolescence need for the project, a benefit of updating the controls system
software is the flexibility to run an additional set of train cars on each of the STS loops. Each loop
currently runs two sets of train cars that can carry a maximum of 3,300 passengers per hour. An
additional set or three sets of train cars can carry a maximum of 4,950 passages per loop per
hour. After the International Arrivals Facility Bridge is operational, reductions in the number of
STS vehicles operating in the South loop may be possible and would free additional vehicles for
the North loop. Purchase of additional or replacement STS vehicles is not part of the scope of
this project. The Airport will be going through a modeling effort to optimize STS vehicle
availability balanced against airline passenger demand.
This project scope was informed by the December 2018 STS Audit and Alternatives Analysis study
and similar ATC system replacement projects in recent years at San Francisco International
Airport (SFO), Dallas Fort Worth International Airport (DFW) and London's Heathrow Airport
(LHR).
Diversity in Contracting 
The project team with the Diversity in Contracting Department determined a Women and
Minority Business Enterprise (WMBE) participation aspirational goal of six percent for the Design
and Automated People Mover Consultant contract. 


Template revised June 27, 2019 (Diversity in Contracting).

COMMISSION AGENDA  Action Item No. 6i                                    Page 3 of 6 
Meeting Date: July 14, 2020 
DETAILS 
This project installs modern and redundant fiber optic and radio networks, replaces end of life
ATC systems hardware, and updates the ATC system with the most current version of the
manufacturer's controls softwarewhile maintaining passenger service to the North and South
Satellites. The project is divided into two distinct phases. The first phase, an enabling project, is
the design and construction of new STS network infrastructure; the second phase is the design,
installation and testing of the ATC equipment.
Scope of Work 
Phase 1  Design and construction of a new hardened STS controls fiber optic network including
conduit, fiber optic cable, server rooms, and supporting electrical infrastructure. Work will
primarily be performed within the 1.7 miles of STS tunnels and maintenance support spaces. 
Phase 2  Design, installation, testing and certification of a new STS train controls system 
including new ATC software and associated equipment (hardware, servers, computers, radios,
networking equipment), STS car retrofits, system testing, certification and decommissioning of
the old system.
Both phases will require over the ramp busing and passenger wayfinding support.
Impacts to Operations 
The project will have major impacts to operations at the North and South Satellites. Installation,
testing and certification of the whole system is expected to take approximately 30 months and
will require parts of the STS to be out of service. The current plan is to limit STS service outages
to the North and South Satellites to a nightly 6-hour window for a 15-18 month period. Over the
ramp busing will be required during outages to maintain access to the North and South Satellites.
Impacts are expected to begin late 2022 and run through the end of 2024.
Acquisition Methodology 
The project is predominantly equipment replacement with a supporting construction project to
provide new physical network infrastructure. Several types of contracts are expected to include: 
(1) Consulting services for the Automated People Mover and Design Consultant; 
(2) Construction; 
(3) Equipment Procurement; 
(4) Services for busing and wayfinding support. 
This request is only for the Automated People Mover and Design Consultant.
Seventy-five percent of the overall contracting opportunity is for the purchase, installation, 
testing and certification of ATC equipment which comes from an Automated People Mover (APM)

Template revised June 27, 2019 (Diversity in Contracting).

COMMISSION AGENDA  Action Item No. 6i                                    Page 4 of 6 
Meeting Date: July 14, 2020 
system manufacturer. The APM manufacturer  is responsible for the design, installation,
integration, testing and certification for passenger use. ATC software equipment configuration
is proprietary to each APM manufacturer. Staff advertised Request for Information (RFI) 20-3 to
determine which suppliers could provide, install and certify a replacement ATC for the STS. Only
Bombardier Transportation LTD responded. Pursuant to CPO-6 and RCW 39.04.280 staff plans to 
utilize a CPO-5 waiver to directly negotiate with Bombardier Transportation for the equipment
purchase.
Schedule 
Activity 
Commission Phase 2 Procurement Authorization    2021 Quarter 2 
Commission Phase 1 Construction Authorization    2021 Quarter 4 
Phase 1 Construction Start                          2022 Quarter 1 
Phase 1 Substantial Completion                    2022 Quarter 4 
Phase 2 Installation and Testing Start                 2023 Quarter 1 
Phase 2 Substantial Completion                    2024 Quarter 4 

Cost Breakdown                                      This Request           Total Project 
Design                                                  $8,775,000             $9,000,000 
Construction                                                     $0             $8,000,000 
Equipment Procurement                                      $0           $59,000,000 
Support Services                                                   $0             $3,000,000 
Total                                                          $8,775,000             $79,000,000 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
The minimum implementation timeline of a replacement ATC system is 36 months.  The status
quo or delayed implementation options place the STS system replacement beyond 2024 which
would significantly increase the risk of system failure and therefore were not considered viable
options.
At the forecasted rate of use, the STS will reach the end of its expected useful life around 2030;
with additional renovation, renewal and replacement expenditures the STS subsystems life may
be extended several years beyond that. It is expected that a new STS or an alternate means of
travel to and from the North and South Satellites will be required no later than 2034.  Airport
staff are commissioning a study to look at alternatives and make a recommendation for future
passenger conveyance to the North and South Satellites.
Alternative 1  Whole STS replacement. This would include replacing the entire automated 
people mover system: remove all existing systems and replace with yet to be determined new

Template revised June 27, 2019 (Diversity in Contracting).

COMMISSION AGENDA  Action Item No. 6i                                    Page 5 of 6 
Meeting Date: July 14, 2020 
system that include new cars, new power rail, new power centers, new controls, and integration 
into the existing facilities footprint. 
Cost Implications: Cost range $600M to $800M 
Pros: 
(1)   New 30 year APM System 
(2)   Competed requirement 
Cons: 
(1)   High Cost 
(2)   Loss of 10 years of STS life 
(3)   STS Service shutdowns (will require months of extensive and continuous shutdown) 
(4)   Full time busing to Satellite Terminals or construction of a new tunnel/bridge 
(5)   Increased risk of failure while planning and designing replacement project. 
This is not the recommended alternative. 
Alternative 2  Renewal and replacement of the ATC system to reduce risk of failure. The project
justification and description above speak to this alternative. This option provides the lead time
required to evaluate new technologies and develop a better understanding of a future SEA facility
layout that the new transportation system will integrate into. In this option, the equipment
manufacturer is given a 6-hour working window each night. 
Cost Implications: Cost range $65M to $95M 
Pros: 
(1)   Maximizes flexibility of STS vehicle Fleet 
(2)   Required for additional passenger throughput 
(3)   Decreases the risk of major disruption to Satellite Services due to failure 
(4)   Ten-year minimum additional useful life of the STS system 
Cons: 
(1)   Single source negotiations with the STS manufacturer 
(2)   Nighttime STS shutdowns 
(3)   May have limited useful life (10 years), given future airport growth projections. 
This is the recommended alternative. 
FINANCIAL IMPLICATIONS 
Cost Estimate/Authorization Summary               Capital        Expense           Total 
COST ESTIMATE 
Original estimate                                $57,000,000               $0     $57,000,000 
Current change                                $19,000,000      $3,000,000    $22,000,000 
Revised estimate                               $76,000,000      $3,000,000     $79,000,000 

Template revised June 27, 2019 (Diversity in Contracting).

COMMISSION AGENDA  Action Item No. 6i                                    Page 6 of 6 
Meeting Date: July 14, 2020 
AUTHORIZATION 
Previous authorizations                            $225,000               $0        $225,000 
Current request for authorization                $8,775,000               $0      $8,775,000 
Total authorizations, including this request       $9,000,000               $0      $9,000,000 
Remaining amount to be authorized           $67,000,000     $3,000,000    $70,000,000 
Annual Budget Status and Source of Funds 
This project, CIP C801043, was included in the 2020-2024 capital budget and plan of finance with
a budget of $57,000,000. A budget increase of $19,000,000 was transferred from the
Aeronautical Reserve CIP (C800753) resulting in zero net change to the Aviation capital budget. 
The funding source would be revenue bonds. This project was approved as a Majority-in-Interest
by the airlines on May 26, 2020. 
Financial Analysis and Summary 
Project cost for analysis              $79,000,000 
Business Unit (BU)                  Terminal Building 
Effect on business performance     NOI after depreciation will increase due to inclusion of
(NOI after depreciation)             capital (and operating) costs in airline rate base. 
IRR/NPV (if relevant)                N/A 
CPE Impact                       $.39 in 2025 
Future Revenues and Expenses (Total cost of ownership) 
Aviation Maintenance labor costs to support the new ATC system are not expected to change
significantly as a result of this project. 
ADDITIONAL BACKGROUND 
The STS was the first inter-terminal Automated People Mover (APM) system in the world and the
second operational APM at an Airport.  Construction of the STS started in 1969 with passenger
service beginning in 1973. The 2003 upgrade of the STS installed twenty-one (21) new vehicles,
a more modern ATC system, electrical distribution components, and a new guiderail in the
existing STS tunnel complex and was expected to last 30 years. The original power rail and travel
path are still in service.
ATTACHMENTS TO THIS REQUEST 
(1)   Presentation slides 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
None 

Template revised June 27, 2019 (Diversity in Contracting).