10b. Memo - STS Controls Renewal and Upgrade Project

COMMISSION 
AGENDA MEMORANDUM                        Item No.          10b 
ACTION ITEM                            Date of Meeting        July 27, 2021 

DATE:     July 16, 2021 
TO:        Stephen P. Metruck, Executive Director 
FROM:    Eileen Francisco, Interim Director, Aviation Facilities and Capital Programs 
Wayne Grotheer, Director Aviation Project Management 
Stuart Mathews, Director Aviation Maintenance 
SUBJECT:  Satellite  Transit  System  (STS)  Controls  Renewal  and  Replacement  Project
Procurement and Construction Authorization (CIP#801043) 
Amount of this request:              $69,240,000 
Total estimated project cost:         $78,240,000 
ACTION REQUESTED 
Request Commission authorization for the Executive Director to (1) execute a contract with
Bombardier Transportation Holdings USA for goods and services; (2) advertise and award a major
works construction contract; (3) advertise and award contracts for busing and wayfinding
services, and (4) use Port crews and small works contracts, in support of the STS Controls Renewal
and Upgrade project (CIP #801043) at the Seattle-Tacoma International Airport (Airport). The
amount of this request is $69,240,000 for a total project authorization of $78,240,000. 
EXECUTIVE SUMMARY 
The Satellite Transit System (STS) transports passengers to and from the Airport's 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 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 Satellites. This authorization allows for: (1) the purchase
and installation of replacement controls equipment from the STS manufacturer Bombardier
Transportation Holdings USA (BTH USA) an Alstom Group Company, (2) procurement of busing
and wayfinding services, and (3) the selection and award of an enabling construction contract for
new STS controls fiber and electrical infrastructure. The STS Controls Renewal and Replacement
Project (CIP 801043) is included in the 2021-2025 capital budget and plan of finance. The project
was approved on the 2020 #2 Majority-In-Interest (MII) ballot. 
While this project will extend the useful life of the existing STS, 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

Template revised January 10, 2019.

COMMISSION AGENDA  Action Item No. __10b__                             Page 2 of 6 
Meeting Date: July 27, 2021 
than 2034.  Outside of this project, Airport staff will begin a study in Q4 of 2021 to look at
alternatives and make a recommendation for future passenger conveyance to the North and
South Satellites.

JUSTIFICATION 
This project provides important benefits for continued operations, security, and safety. The STS
is the primary conveyance method to move passengers efficiently between the Main Terminal
and 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, it may be possible to reduce
the number of STS vehicles operating in the South loop, which would allow for 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.
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. A new STS or an alternate means of travel to and from
the North and South Satellites is being programmed for replacement by 2034. Outside of this
project, Airport staff will begin a study in Q4 of 2021 to look at alternatives and make a
recommendation for future passenger conveyance to the North and South Satellites.
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), London's Heathrow Airport (LHR) 
and the APM project at Los Angeles International Airport (LAX). 


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

COMMISSION AGENDA  Action Item No. __10b__                             Page 3 of 6 
Meeting Date: July 27, 2021 

Diversity in Contracting 
The project team with the Diversity in Contracting Department determined a Women and
Minority Business Enterprise (WMBE) participation aspirational goal of ten percent for the
enabling construction project.  The previously selected design and automated people mover
consultant committed to a sixteen percent WMBE goal.
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 software while 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 Vehicle  ATC replacement, 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 to 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. Contracts include: 
(1)      Consulting services for the Automated People Mover and Design Consultant; 

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

COMMISSION AGENDA  Action Item No. __10b__                             Page 4 of 6 
Meeting Date: July 27, 2021 
(2)      Major Construction for the enabling STS fiber optic loop; 
(3)      Goods and Services Contract for the STS Controls Equipment; 
(4)      Services contracts for busing and wayfinding support. 
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)
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
the manufacture BTH USA responded. Pursuant to CPO-6 and RCW 39.04.280 staff plans to utilize
a CPO-5 waiver to directly negotiate with BTH USA for the equipment purchase.
Schedule 
Activity 
Phase 2 Design Start                                            2022 Quarter 1 
Phase 1 Construction Start                                     2022 Quarter 4 
Phase 1 Substantial Completion                               2023 Quarter 2 
Phase 2 Installation and Testing Start                            2023 Quarter 3 
Phase 2 Substantial Completion                               2024 Quarter 4 
Cost Breakdown                                     This Request           Total Project 
Design                                                           $0             $9,000,000 
Construction                                             $7,740,000             $7,740,000 
Equipment Procurement                             $58,500,000           $58,500,000 
Support Services                                          $3,000,000             $3,000,000 
Total                                                        $69,240,000             $78,240,000 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
The minimum implementation timeline of the 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.
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
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 

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

COMMISSION AGENDA  Action Item No. __10b__                             Page 5 of 6 
Meeting Date: July 27, 2021 
(2)   Competed requirement 
Cons: 
(1)   High Cost 
(2)   Loss of 10 years of STS vehicle life 
(3)   STS Service shutdowns (will require months of extensive and continuous shutdown) 
(4)   Full time busing to Satellite Terminals or construction of 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: Estimated cost $78,240,000 
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 
Previous changes  net                         $19,000,000      $3,000,000     $22,000,000 
Art (Transfer to Art CIP)                             ($760,000)                $0       ($760,000) 
Current estimate                               $75,240,000      $3,000,000     $78,240,000 
AUTHORIZATION 
Previous authorizations                          $9,000,000               $0      $9,000,000 
Current request for authorization               $66,240,000      $3,000,000     $69,240,000 
Total authorizations, including this request      $75,240,000      $3,000,000     $78,240,000 
Remaining amount to be authorized                    $0             $0             $0 

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

COMMISSION AGENDA  Action Item No. __10b__                             Page 6 of 6 
Meeting Date: July 27, 2021 

Annual Budget Status and Source of Funds 
This project, CIP C801043, was included in the 2021-2025 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 will 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              $78,240,000 
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                       $.30 in 2025 
Future Revenues and Expenses (Total cost of ownership) 
Additional Aviation Maintenance personnel will be required to support the installation of the ATC
system and expanded operation of two to three trains in a loop. Staff anticipate an additional
two maintenance personnel for the installation of the ATC. Staff will evaluate further staffing
increases for the expanded loop capacity at the end of the 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 
July 14, 2020  The Commission authorized the award of a consultant contract, design, 
preparation of construction and purchasing documents, and use of Port crews. At that
time, the estimated project cost range was $65,000,000 to $95,000,000. 
March 26, 2020  The Commission's Aviation Committee was briefed on the need for the
project. 

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

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