PORT OF SEATTLE 
MEMORANDUM 
COMMISSION AGENDA               Item No.       4f 
ACTION ITEM 
Date of Meeting     April 12, 2016 
DATE:    April 4, 2016 
TO:      Ted Fick, Chief Executive Officer 
FROM:   Michael Ehl, Director, Airport Operations 
Wayne Grotheer, Director, Aviation Project Management Group 
SUBJECT:  State Route (SR) 518 Interchange Restoration 
Amount of This Request:        $1,820,000   Source of Funds:     Revenue Bonds 
Est. Total Project Cost:          $2,600,000 

ACTION REQUESTED 
Request Commission authorization for the Chief Executive Officer to advertise and execute a
major works construction contract to construct the SR-518 Interchange Restoration project. This
authorization is for a total of $1,820,000. 
SYNOPSIS 
This SR-518 Interchange Restoration project will restore the interchange at SR-518 and Des
Moines Memorial Drive (DMMD) to its preexisting condition, which is a Port commitment to
the Washington State Department of Transportation (WSDOT). The Port previously modified the
interchange for use as a haul route for the Third Runway project. The Port requested and
WSDOT agreed to extend the use of the interchange for other major airfield projects.
Restoration of the SR-518 interchange satisfies the Port's commitment to WSDOT. As the
interchange is owned by WSDOT, the cost of this project will be accounted for as public
expense. 
BACKGROUND 
In preparation for the Third Runway project, the Port entered into an agreement with WSDOT to
allow the Port to construct a temporary construction only access ramp for use as a haul route at
SR-518 and DMMD. The original agreement, GCA 1998, was signed in February 2000. The
Port completed the Third Runway project in 2008. The Port then requested to utilize the haul
route to reconstruct Runway 16L/34R. WSDOT agreed and the Port entered into Supplement 1
of GCA 1998 in April 2009. That project was completed in fall of 2009. The Port then
requested to utilize the haul route to complete the Cargo hardstand projects and Runway
16C/34C Reconstruction project and WSDOT agreed. The Port entered into Supplement 2 of
GCA 1998 in March 2014. In December 2015, the Runway 16C/34C reconstruction project was
completed so the haul route is no longer needed. There are no projects in the foreseeable future

Template revised May 30, 2013.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
APRIL 4, 2016 
Page 2 of 4 
that will require the use of the haul route. Accordingly, the Port is now ready to restore the
interchange and fulfill the terms of the agreement with WSDOT. 
Port staff evaluated entering into a reimbursable agreement with WSDOT to advertise, execute
and perform construction administration services. After protracted discussions with WSDOT
between August 2015 and February 2016, it was determined recently that this approach would
delay the project to 2017 and was therefore no longer viable due to the impact associated with
the delay. 
The City of Burien is planning to construct the SR-518 East Bound Off-Ramp at DMMD in close
proximity to the Port's project.  Early in the planning stages, the Port and City of Burien
discussed combining both the Port's restoration and the City of Burien's project into one
construction project. Due to the uncertainty of funding for Burien's project this was deemed
unfeasible. Coordination between the City of Burien, WSDOT and the Port is on-going. The
Port's project is scheduled to be completed in 2016 and the City of Burien's project is scheduled
to begin in 2017.  The staggered construction schedule has been agreed upon with the City of
Burien to alleviate construction coordination issues between these projects. Deferring the Port's
project to 2017 would delay the City of Burien's project to construct a new SR-518 off-ramp, the
City's project relies upon the Port's project to restore the alignment for the SR-518 on-ramp 
before the City's project can be completed and the interchange opened.
One of the Century Agenda goals is to use the Port's influence as an institution to promote small
business growth and workforce development. Port staff will coordinate with the Office of Social
Responsibility to identify potential opportunities within the scope of work for small business
utilization. 
PROJECT JUSTIFICATION AND DETAILS 
The Port is obligated to restore SR-518 interchange to its preexisting condition per the Port's
agreement with WSDOT. This project will fulfill our commitment to WSDOT and satisfy the
terms of the agreement. 
Project Objectives 
Project objectives are as follows: 
Restore SR-518 interchange to its preexisting condition 
Fulfill the terms of the agreement with WSDOT 
Scope of Work 
The SR-518 interchange restoration includes the following scope of work items: 
1.  Removal of asphalt pavement, signage, curbs, traffic signal and traffic barriers 
2.  Installation of temporary erosion and sediment control, paving, striping, drainage,
fencing, illumination, signing, seeding, curbing and sidewalks

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
APRIL 4, 2016 
Page 3 of 4 
Schedule 
Commission Authorization                             1st Quarter   2016 
Execute Construction Contract                             3rd Quarter   2016 
Construction Completion                               4th Quarter   2016 
FINANCIAL IMPLICATIONS 
Budget/Authorization Summary           Capital      Expense     Total Project 
Budget                                    $2,600,000    $2,600,000 
Previous Authorizations                             $780,000     $780,000 
Current request for authorization                        $1,820,000    $1,820,000 
Total Authorizations, including this request                 $2,600,000    $2,600,000 
SR-518 Project Cost Breakdown                      This      Total Project 
Request 
Construction                              $0    $1,690,000    $1,690,000 
Design                                 $0          $0     $780,000 
State & Local Taxes (estimated)                  $0      $130,000     $130,000 
Total                                     $0     $1,820,000    $2,600,000 
Budget Status and Source of Funds 
The SR-518 Interchange Restoration budget was included in the 2016 Plan of Finance. The
project will be accounted for as public expense and will be funded by existing revenue bonds.
As the project was required mitigation for an airfield asset, the debt service costs will be
recovered in the airfield movement area rate base. The design authorization was included as an
expense element of the Runway 16C/34C Reconstruction project. 
Financial Analysis and Summary 
CIP Category             Renewal/Enhancement 
Project Type              Renewal & Replacement 
Risk adjusted discount rate     N/A 
Key risk factors             N/A 
Project cost for analysis        $2,600,000 
Business Unit (BU)          Airfield 
Effect on business performance  N/A 
IRR/NPV             N/A 
CPE Impact             $.01 in 2017

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
APRIL 4, 2016 
Page 4 of 4 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
The status quo is not a viable alternative because the Port would not fulfil the terms of the
agreement with WSDOT. Therefore, it is not listed as an alternative . 
Alternative 1  Delay the project until 2017 for WSDOT to advertise, execute a construction
contract and perform construction administration services.
Cost Implications: Total estimated cost for this alternative is $2,700,000. 
Pros: 
(1)  Fulfills the Port's commitment to WSDOT 
(2)  WSDOT is most familiar with their requirements and processes 
(3)  Less administrative coordination effort between WSDOT and the Port for final
acceptance of the project which is a WSDOT owned facility 
Cons: 
(1)  Negatively impacts the City of Burien's SR-518 off-ramp project likely causing a 1-
year delay to their construction.
(2)  Could negatively impact the City of Burien and the Port relations 
(3)  Deferring the restoration could negatively impact WSDOT and Port relations 
This is not the recommended alternative. 
Alternative 2  Restore the SR-518 interchange in 2016. 
Cost Implications: Total estimated cost for this alternative is $2,600,000. 
Pros: 
(1)  Fulfills the Port's commitment to WSDOT. 
(2)  Avoids conflict with the City of Burien and their SR-518 off-ramp project. 
Cons: 
(1)  None 
This is the recommended alternative. 
ATTACHMENTS TO THIS REQUEST 
(1)  Site Map 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
(1)  February 25, 2014    Commission authorized design for SR-518 Interchange
Restoration.