Item No. 6i_supp
Meeting Date: July 14, 2020
STS Controls Renewal and Replacement
Design Authorization
Seattle-Tacoma
International Airport

Satellite Transit System (STS)
The STS is an Automated People Mover (APM)
system that is the primary means for moving
the public to the North & South Satellites
Design and construction: 1969 - 1972
Last major upgrade: 1999 - 2003
2nd Airport APM in the World*
6 Stations with 1.7 Miles of track
In 2019 the STS carried 28 Million PAX
Replacement expected by 2034

Project Purpose
Renewal and replacement project for the STS's
Automatic Train Control (ATC) sub-system and
associated software, hardware & networks

Replaces 20 year old critical end of life &
obsolete components
Optimizes STS system capacity
System recovery time improved
Project received positive MII vote

STS Controls Project  Scope
Construction                Goods & Services
Phase I                        Phase 2
ATC System
- Software
- Hardware
- Network
- Radios
- Certification
Negotiated
Fiber/ Electrical Loop
VATC X 21 Cars     Procurement
Network

Customer Experience
Planning on limiting STS shutdowns to
6 hour periods
23:00 to 5:00
12 to 15 month requirement
Will test on shuttle track when possible
Dedicated Wayfinding Staff
Contracted Bus Support

Risks
Major Risks
Safety: Moving train cars and exposed 600V power rail
Major impacts to Satellite operations with extended STS outages
Procurement method (single supplier negotiations)
Daily transfer between new and old controls systems
Lessons Learned
SFO (6 to 17 months, backwards compatibility, # test engineers)
DFW (1st major airport upgrade of similar system)
LHR (The same radio replacement strategy)
2003 SEA Upgrade (staffing, safety, training)

Project Timeline
2020            2021              2022             2023            2024

Long
APM    Develop ATC                                                D
ATC Design         Lead        ATC Installation & Testing
Consultant       Bid Package
Items                                          C
Loop
Loop Design
Construction
Phase 2
12 to 15 months
Commission Authorizations                                        Satellite Tunnel Impacts
Phase 1                     Nightly Busing Operation
APM Consultant        July 2020          1 to 2 months
ATC Procurement       2021 Q2           Satellite Tunnel Impacts
Loop Construction      2021 Q4            Nightly Busing Operation

Budget            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

Cost Range: $65M - $95M

STS Asset Management - Long Term
Renewal or Replacement to the Satellite Transit
System will be required in the next 10 to 15 years.
Requires study to evaluate alternative and
implementation
$600M - $800M for a new APM system
Evaluate alternate technologies
Autonomous vehicles
High-speed moving walkways
Alternate passenger movement to Satellites
Busing
Tunnel / bridge