
COMMISSION AGENDA – Briefing Item No. __9B__ Page 2 of 6
Meeting Date: July 9, 2019
Template revised September 22, 2016; format updates October 19, 2016.
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.