COMMISSION 
AGENDA MEMORANDUM                        Item No.          9a 
BRIEFING ITEM                            Date of Meeting     November 9, 2021 
DATE:     November 1, 2021 
TO:        Stephen P. Metruck, Executive Director 
FROM:    Laurel Dunphy, Director Airport Operations 
Arlyn Purcell, Director AV Environment & Sustainability 
Peter Lindsay, Operations Development Manager, Airport Operations 
Leslie Stanton, Environmental Programs and Sustainability Manager 
SUBJECT:  Airport Ground Transportation Access Plan Roadmap 
EXECUTIVE SUMMARY 
In June 2019, the Commission adopted Resolution No. 3759 (the Resolution) which established
key principles and time-sensitive goals for ground transportation activity at Seattle-Tacoma
International Airport (Airport) related to greenhouse gas emissions, customer choice, mode shift,
and social equity. To meet the goals set forth by the Commission, staff developed the Ground
Transportation Access Plan (GTAP); a programmatic planning initiative that explores new
strategies and tactics to meet the Commission's ground transportation goals at the Airport by
2030. The strategies and tactics occur across multiple areas, including planning and design for
projects, program initiatives such as articulated in GTAP, operational changes, and contracting
specifics with tenants and operators. 
The Resolution developed the following specific policy goals for the Airport including:
Reduce Scope 3 greenhouse gas emissions 50 percent relative to 2005 baseline
conditions
Establish and sustain a 30 percent private vehicle pick-up and drop-off mode share
Maintain a 15-minute maximum travel time from the Airport's clock tower to the
curbside loading areas or parking garage 
Since adoption of the Resolution, additional priorities emerged as staff engaged in multiple
ground transportation study sessions and work advanced in multiple areas, but also was affected
by the slowdown in passengers through COVID. The following considerations are a distillation of
Commission feedback received over the past year: 
Increase passenger and employee use of high occupancy vehicle (HOV) modes of
travel to the Airport 
Minimize private vehicle demand for curbside loading and unloading
Consideration and focus on social equity measures for impacted communities

Template revised April 12, 2018.

COMMISSION AGENDA  Briefing Item No. 9a                                  Page 2 of 2 
Meeting Date: November 9, 2021 
The purpose of this briefing is to review the GTAP Roadmap (the Roadmap)a step-by-step,
multi-year work program to meet the Commission's adopted ground transportation goals. Staff
seek to update the Commission on the wide range of strategies and specific tactics guiding SEA's
ground transportation development, including capital investments such as the Widen Arrivals
project. At the core of the Roadmap are four key concepts to organize future work, namely:
(1) Promoting low carbon modes (e.g., light rail and bus transit, renewable fuel buses)
(2) Pricing and access fees (i.e., financial incentives to use cleaner modes)
(3) Management  and  efficient  operations  (e.g.,  identifying  preferred  uses,  minimize
transaction costs)
(4) Promoting HOV modes (e.g., Improved access like moving walkways and electric cart
service)
The attached PowerPoint presentation contains the detail and workflow staff anticipate over the
coming  years.  This  multi-faceted  approach  to  airport  landside  development  includes
commitments in new operating concepts, capital spending, and programmatic initiatives to
achieve the Commission's goals.
ATTACHMENTS TO THIS BRIEFING 
(1)   Presentation slides 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
June 8, 2021 - Ground Transportation Access Plan Study Session: A briefing of the full
Commission on the status of GTAP work and progress. The focus of the presentation was on
recent accomplishments and future work including the concepts of electrification, increased
electrification of ground transportation modes and emphasis on long-term parking. 








Template revised September 22, 2016.