COMMISSION 
AGENDA MEMORANDUM                Item No.       4g 
ACTION ITEM                   Date of Meeting   November 14, 2017 
DATE:    November 7, 2017 
TO:     Dave Soike, Interim Executive Director 
FROM:   Michael Ehl, Director Airport Operations 
Wayne Grotheer, Director, Aviation Project Management 
SUBJECT:  2018 Taxiway Improvement Projects  C800914 
Amount of this request:        $39,685,000 
Total estimated project cost:     $47,500,000 
ACTION REQUESTED 
Request Commission authorization for the Executive Director to: (1) advertise and execute a
single major works construction contract comprised of Taxiways A/B Reconfiguration; Taxiway L
Relocation; Taxiway Q Mitigation; 2018 Airfield Pavement Replacement Projects; B Concourse
IWS Upgrade; and Taxiway H Signage herein to be referred to as 2018 Taxiway Improvement
Projects and (2) award an irregular bid or bid greater than 10% over engineers estimate, should
that occur,  with Commission notification only provided the total project  remains within
authorized budget. 
EXECUTIVE SUMMARY 
This project consists of taxiway, runway and apron modifications, reconfiguration, repairs and
relocation for safety and continued operational access by aircraft. This project also includes
improvement to the industrial waste system and new taxiway signage. Originally this project
was driven by the expansion of the North Satellite (NSAT) triggering the need to reconfigure the
adjoining Taxiways A/B. Due to the proximity of Taxiway L to the Taxiway A/B work, the FAA
has required that Taxiway L be brought into compliance with current FAA design standards by
being relocated to minimize potential aircraft runway incursions. This relocation requires a
closure of Runway 16L/34R. This closure provides the opportunity to proceed with fixing
another safety concern at the intersection of Taxiway Q as well as needed runway repairs.
Based on the complexities of coordination, similar work, seasonal construction limitationsand 
runway use restrictions, it was decided that the many 2018 airfield work projects should be
combined into a single airfield contract to best coordinate airfield construction phasing in the
safest and most efficient manner. 


Template revised September 22, 2016.

COMMISSION AGENDA  Action Item No. __4g__                    Page 2 of 10 
Meeting Date: November 14, 2017 
The request to notify rather than return to the Commission for authorization to award an
irregular bid, provided there are sufficient project funds, is unusual. The request is made to
reduce the risk of impact to the International Arrival Facility (IAF) project. The IAF needs the
phase 1 work in this project to be complete by May 31, 2018 so aircraft can be shifted from
Hardstand 2 to Hardstand 6 and assembly of the IAF pedestrian bridge can occur. The schedule
is particularly tight due to the delivery being advanced to avoid having the work occur after
Memorial Day when the travel demand increases. 
A Project Labor Agreement (PLA) was previously authorized for this project. FAA reviewed the
PLA and notified staff that certain sections do not comply with federal regulations that require
full and open competition. Organized labor relayed to staff that these sections are key terms of
the PLA that they are unwilling to change. Port staff have worked with both parties and now
have a preliminary verbal agreement for modified verbiage that appears acceptable to each
party. Staff continues to recommend that a PLA be used on this project to reduce schedule risk
issues. 
JUSTIFICATION 
A new capital improvement project (CIP) was established for the relocation of Taxiway L and
modification of Taxiway Q. Because of their close proximity and similar work the previously
authorized funds for the Taxiway A/B work, under CIP C800556 North Satellite Renovations &
NSTS Lobbies project, were transferred and combined with Taxiway L/Q into a single CIP
C800914 and major construction contract. Three other CIP's C800483, C800913 andC800406 
have also be combined into CIP C800914 2018 Taxiway Improvement Projects to facilitate the
administration of the combined project and to avoid delays that would occur should the bid
result in an individual CIP having insufficient budget. 
Taxiway A/B Reconfiguration: This is an enabling project to the NSAT project which must be
completed by January 2019 to facilitate North Satellite phase one expansion opening. 
Taxiway L Relocation/Taxiway Q Modification: Due to the proximity of Taxiway L to the
adjacent Taxiway A/B Reconfiguration, the FAA required that Taxiway L be brought into
compliance with the current FAA design standards and be relocated. With the corresponding
closure of Runway 16L/34R the Taxiway Q Runway Incursion Mitigation (RIM) intersection will
be modified. 
2018 Airfield Pavement Replacement Projects:  This project replaces individually identified
distressed and or damaged concrete panels, asphalt, and joint sealant for the 2018 portion of
the 2016-2020 Airfield Pavement Program.
B Concourse IWS Upgrade: Modifications to the B Concourse IWS System between gates B5  
B7 will install a new flush gutter section to complete connection. This portion of the contract
has previously been authorized for both design and construction. 

Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Action Item No. __4g__                    Page 3 of 10 
Meeting Date: November 14, 2017 

Taxiway H Signage: This sign will improve safety for this area. This work is part of the RW
16C/34C Reconstruction project that has previously been authorized for both design and
construction. 
DETAILS 
Taxiways A/B Reconfiguration was the initial enabling project required for the new aircraft gate
parking positions in the Phase One opening of the NSAT project. Because the NSAT expansion
pushes the existing terminal to the west, the related parked aircraft will protrude into the
existing, adjacent taxilane.  This requires that the adjacent taxilane and taxiways be
reconfigured to accommodate the expansion, maintain airport operational efficiency and
maintain required aircraft separation distances. At the initial Preliminary Hazard Assessment
(PHA) of the Taxiway A/B Reconfiguration, the current location of Taxiway L was identified as a
potential hazard that the FAA is requiring the Port to relocate as risk mitigation.
Taxiway L was constructed prior to the current FAA guidance regarding direct access from a
ramp area to a runway. To bring Taxiway L up to current design standards it is being relocated
approximately 300 feet to the south and will provide a definitive turning movement for aircraft
prior to entering the adjacent runway. As part of this relocation project the runway and
taxiway pavement markings will also be modified to further improve situational awareness and
minimize safety risk. Reconstruction of Taxiway L requires the closure of Runway 16L/34R. This
runway closure brought opportunity to complete other needed improvements, which also
required that the runway be closed. Additional work requiring runway closure is the Taxiway Q
mitigation. 
The FAA has designated the intersection of Taxiway Q and Taxiway B as a safety RIM as a result
of numerous runway incursions in this location. The RIM designation alerts pilots that the
location is potentially problematic. The FAA has not been able to provide definitive reasons for
the incursions at Taxiway Q, but have colloquially indicated that the taxiway centerline
configuration may play a part. As a step toward RIM mitigation, the centerline alignment will
be modified. 
As part of the continuing safety assurance at SeaTac there is an established Airfield Pavement
Replacement Program. The required closure of Runway 16L/34R provides opportunity for joint
seal and concrete panel replacement to occur simultaneously with the Taxiway L relocation. 
Gate reconfiguration at B Concourse completed in 2017 converted 4 wide body gates to narrow
body gates allowing flexibility for 6 narrow body aircraft. Currently the area between Gates B5
and B7 does not have adequate Industrial Waste System (IWS) infrastructure supporting deicing 
activities. This project will upgrade the IWS system to capture glycol from deicing activities and
provide flexibility to our airline operations.

Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Action Item No. __4g__                    Page 4 of 10 
Meeting Date: November 14, 2017 
The need to add a sign at Taxiway H was identified after the contract for the center runway
reconstruction, that included the relocation of Taxiway H, was complete.
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 is coordinating with Economic
Development Division's Small Business Group to identify potential opportunities within the
scope of work for small business utilization. This project may include federal assisted fund
which would require the utilization of the U.S Department of Transportation's small business
program per 49 CFR Part 26 - Disadvantage Business Enterprise (DBE) requirements.
CRITICAL ISSUES 
This construction contract was initially planned using a typical construction window of May
through September 2018. Due to operational concerns and other projects' constraints, the
project will have critical work occur in 2 key phases outside of this period. Schedule constraints
include the following:
1)  Runway closures between Memorial Day and Labor Day are not desirable due to high
traffic volumes,
2)  IAF bridge construction is dependent upon the initial phase of this project  being
complete by May 31, 2018,
3)  NSAT Phase 1 completion scheduled for January 2019 opens new gates on the west side
of the terminal is dependent upon the completion of the 2018 Taxiway A/B and L work.
The new gates that are critical to allow renovation of the existingterminal to proceed 
under NSAT Phase 2 scheduled to be complete in July 2021. 
In order to address the schedule constraints, a portion of the work will occur in April to May
2018. The early construction advertisement date necessitated by this has resulted in there
being only one week of float remaining in the project schedule for advertisement, award, and
notice to proceed. The 2nd phase work requiring a runway closure has been shifted to begin
immediately after Labor Day.
There are a number of risks associated with this project including: 
1)  Delay in being able to begin work due to construction bid outcomes such as a bid
protest being received or the low bid being more than 10% over the Engineer's
Estimate. The project schedule contains almost no float. Should a delay occur in
awarding the contract, it would have a domino effect that would likely delay assembly
of the pedestrian bridge for the IAF project. 
2)  Weather, bid protests, and other such external factors could occur and are difficult to
mitigate in advance. 
3)  Labor unrest could affect delivery of the project. There are at least six union contracts
that are expected to be used on this project that will expire on 5/31/18. A PLA is
typically utilized on airfield projects to reduce the risk of work stoppage. Accordingly,
staff continues to recommend that a PLA be used on this project to reduce risk. Even

Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Action Item No. __4g__                    Page 5 of 10 
Meeting Date: November 14, 2017 
with the use of a PLA, offsite labor, such as for the delivery of materials, is not a part of
the PLA.
4)  Completion of the initial phase of work by 5/31/18 so the IAF bridge construction can
proceed. The projects are linked as the detour route for Taxiway A during April to May
construction encumbers Hardstand 6 and the IAF work will need to shift aircraft from
Hardstand 2 to Hardstand 6 for the bridge assembly to occur. 
5)  Beginning work after Labor Day that is anticipated to extend into December will be
highly dependent upon favorable weather, a scarce commodity at that time of year, and
the ability for the Contractor to access the airfield, which may be prevented during fog
or other such conditions. The late start of work could cause the work the re-opening of
RW 16L/34R to be delayed. Since this runway is the longest and closest to the terminal,
an extended closure has an extremely high impact on airport operations. During poor
visibility conditions the airport may go into Surface Movement Guidance and Control
Systems (SMGCS) and the airport will then be limited to a single runway. Once the 2nd 
phase of airfield construction begins, the work then must be completed and deleting
scope is not a mitigation option.  The nature of the work; excavation, lighting, and
utilities, within the runway and taxiway safety areas cannot be left unfinished or open.
6)  Should the 2nd phase of airfield construction, which closes the runway, extend to late
January 2019, the NSAT Phase 1 opening of gates that allows work to continue on NSAT
Phase 2 and to maintain airline operations would be impacted.
Mitigation measures continue to be developed and will need to be reexamined as the project is
delivered. Current mitigation measures include:
1)  Request for approval to notify rather than return to the Commission should an irregular
bid occur and for the contract to be awarded as long as there are sufficient authorized
funds will help to avoid delays in the project proceeding. 
2)  Appropriate measures to ensure the initial phase of work is complete before the current
union contracts expire on 5/31/18 will be used. 
3)  Staff is working with FAA and the airlines to examine the potential earlier start of the 2nd 
phase of work to reduce risk that occurs with construction in the fall and winter. This
would also help to avoid or mitigate the domino of impacts that could occur to airport
operations and the NSAT project should completion of this work be delayed by weather. 
4)  As mentioned above, weather, bid protests, and other such external factors are difficult
to mitigate in advance but will be monitored, communicated and addressed at the time,
should they occur. 
Scope of Work 
1)  Relocate Taxiway L 
2)  Adjust Taxiways B/Q centerline radii to include adjustment of in-pavement taxiway
centerline lights and pavement marking 
3)  Modify and realign Surface Movement Ground Control (SMGC's) lights and connection
centerlines between Taxiway A, Taxiway B and entrance to North Satellite taxilane 
4)  Replace damaged asphalt with concrete at South Satellite 

Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Action Item No. __4g__                    Page 6 of 10 
Meeting Date: November 14, 2017 
5)  Replace distressed/damages concrete panels at various locations on airfield 
6)  Install flush gutter at Concourse B 
7)  Install new signage at Taxiway H 
Schedule 
Construction has been scheduled in coordination with overall airport operations to minimize as 
possible the disruption to the heaviest periods of airline operations during peak summer
season. Portions of the work will be performed early in the spring, with the majority of work
requiring Runway 16L/34R closure to begin after Labor Day, if it cannot be advanced to earlier
in August.

Commission design authorization          2017 Quarter 1 
Design start                          2017 Quarter 1 
Commission construction authorization       2017 Quarter 4 
Construction start                      2018 Quarter 2 
In-use date                          2018 Quarter 4 
Cost Breakdown                         This Request       Total Project 
Design                                   $314,000         $4,115,000 
Construction                             $39,371,000        $43,385,000 
Total                                      $39,685,000         $47,500,000 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
These alternatives are for the contract as a whole with emphasis on the major portions of work 
being Taxiway A/B Reconfiguration and Taxiway L Relocation. 
1. Status Quo  No Construction 
Cost Estimate: $0 direct cost 
Pros: 
No runway closures 
Cons: 
Curtailment of the NSAT project expansion  will not be able to proceed without
changes to the taxiways. 
Elimination of two-way directional taxiway movement at the NSAT area. 
Disruption of airline movement positioning operations north to south 
Air Traffic Control delays  aircraft movement to, from and around the North
Satellite and aircraft movement north and south for take-offs 
This is not the recommended alternative 


Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Action Item No. __4g__                    Page 7 of 10 
Meeting Date: November 14, 2017 

2. Separate Construction Contracts 
Cost Estimate: $ 49,875,000 
* previously estimated $50,000 cost increase each time large aircraft cannot use Runway
16L/34R for takeoff. 
Pros: 
Separation of funding 
Single design consultant 
Not all portions of the single contract require FAA tracking/reporting 
Cons: 
Additional Runway 16L/34R closures 
Significant operational and cost increases to airlines 
Will not meet FAA deadlines for Taxiway L relocation 
This is not the recommended alternative 

3. Single Major Construction Contract 
Cost Estimate: $47,500,000
Pros: 
Meet construction deadlines for NSAT program 
Single Runway 16L/34R closure of the shortest duration 
Single construction season reducing airline and airport operational disruptions 
Best construction coordination to minimize cost and operational impacts to airlines 
Cons: 
Runway closure required for construction 
This is the recommended alternative 







Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Action Item No. __4g__                    Page 8 of 10 
Meeting Date: November 14, 2017 
FINANCIAL IMPLICATIONS 
Capital               Taxiway A/B    Taxiway L/Q    2018 Pavement   B Concourse  Taxiway H      Total 
IWS      Signage 
COST ESTIMATE 
Original estimate     $3,045,000   $9,700,000   $20,000,000  $1,750,000  $250,000  $34,745,000 
Current cost       $6,955,000  $10,300,000   ($4,500,000)                   $12,755,000 
increase/(decrease) 
Revised estimate    $10,000,000  $20,000,000  $15,500,000  $1,750,000  $250,000  $47,500,000 
AUTHORIZATION 
Previous         $3,045,000   $1,750,000   $1,020,000  $1,750,000  $250,000   $7,815,000 
authorizations 
Current request for  $6,955,000  $18,250,000  $14,480,000                  $39,685,000 
authorization 
Total           $10,000,000  $20,000,000  $15,500,000  $1,750,000  $250,000  $47,500,000 
authorizations,
including this
request 
Remaining amount       $0       $0        $0       $0     $0        $0 
to be authorized
C800914 Taxiway Improvement
CIP Budget    CIP Auth
Current C800914                    $ 23,500,000         $ 4,795,000 
Plus Transfers:
C800406 RW 16C-24C Design - U00407         250,000      250,000
C800483 Airfield Pavement - U00349          22,000,000     1,020,000
C800913 Concourse B IWS Upgrade - U00398    1,750,000     1,750,000
Net After Transfer                       $ 47,500,000          $ 7,815,000 

Taxiway A/B 
The initial Taxiway A/B design authorization and project construction estimate were approved
in the overall NSAT project C800556. The initial Taxiway A/B Reconfiguration project estimate
was $3.2M. The original scope and estimate was based on only needing to make small
adjustments to the centerline with removal of and realigning with paint. The scope and
estimate increased with the determination that in-pavement lighting needed to be relocated
including concrete panel removal and replacement.  Finally the addition of the FAA
requirement for additional taxiway separation and reconfiguration required a new design

Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Action Item No. __4g__                    Page 9 of 10 
Meeting Date: November 14, 2017 
package, additional excavation, and additional pavement; all together increasing the project
estimate to $10,000,000.
The authorized and budget amount of $3,045,000 has been transferred from the NSAT program
CIP C800556 to the Airfield program 2018 Taxiway Improvement Projects CIP C800914. 
Taxiway L/Q 
Increase in details of scope have resulted in estimate and budget increase due to several
impacts.
1)  Lessons learned in previous projects previously utilizing on-sight concrete batch plant
regarding waste water management.
2)  Additional increase is due to extensive Storm Water Management and Temporary
Erosion and Sediment Control (TESC) within such constrained areas next to runway. 
3)  Removal and replacement of concrete panels where abandoned taxiway light cans are
to be removed. 

2018 Pavement Program 
The Airfield Pavement Program (C800483) is included in the 2018-2022 capital budget and plan
of finance with a budget of $32,500,000. The 2018 portion is estimated at $22,000,000. The
authorized $1,020,000 and remaining budget of $20,980,000 has been transferred from
C800483 to the 2018 Taxiway Improvement Projects CIP C800914. 
B Concourse IWS Upgrade 
The authorized and budget amount of $1,750,000 has been transferred from C800913 to the
2018 Taxiway Improvement Projects C800914. 
Taxiway H Signage 
The authorized and budget amount of $250,000 has been transferred from C800406 to the
2018 Taxiway Improvement Projects CIP C800914. 
Annual Budget Status and Source of Funds 
Capital project C800914 2018 Taxiway Improvement Projects was included in the 2017-2022
capital budget and plan of finance. The budget increase of $12.7M was transfer from C800483
Airfield Pavement Program. The funding sources would be Airport Development Fund and 
future revenue bonds. The Port will be submitting the Airport Improvement Program (AIP)
grants, estimated at $13 million for the use of 2017 and 2018 Entitlements. 
Financial Analysis and Summary 
Project cost for analysis         $47,500,000 
Business Unit (BU)            Airfield Apron Area and Airfield Movement Area 
Effect on business performance   NOI after depreciation will decrease 

Template revised September 22, 2016; format updates October 19, 2016.

COMMISSION AGENDA  Action Item No. __4g__                   Page 10 of 10 
Meeting Date: November 14, 2017 
(NOI after depreciation) 
IRR/NPV (if relevant)           N/A 
CPE Impact                $0.13 in 2019, $0.18 without grants 
ATTACHMENTS TO THIS REQUEST 
Diagram of 2018 Taxiway Improvement Projects 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
Taxiways A/B/L/Q 
March 14, 2017  The Commission authorized design funds for construction documents for
Taxiways L and Q, to transfer budget and authorization from the NSAT project, and
approved use of PLA. 
May 24, 2016  The Commission authorized the NSAT increase of project scope and budget
that included Taxiway Lighting and Panel Replacement of $3.2M. 
2018 Pavement Replacement 
May 9, 2017  The Commission authorized design funds for construction documents for
replacement of distressed pavement and joint seal replacement in the 2018 portion of
the 2016-2020 Pavement Program, and approved use of PLA. 
October 25, 2016  The Commission authorized advertisement and execution of contract
for retrofits of 400 Hz In-ground power units and reconstruction of existing pavement at
Cargo 2. 
February 24, 2015  The Commission authorized design funds for construction documents
for replacement of distressed pavement and joint seal replacement in the 2016 portion
of the 2016-2020 Pavement Program. 
B Concourse IWS Upgrade 
October 25, 2016   The Commission authorized capital spending for design and
construction of Port utility and supportive infrastructure work associated with the
Concourse B gate reconfiguration. 
Taxiway H Signage 
December 2, 2014  The Commission authorized advertisement and execution of the
Runway 16C/34C reconstruction that included the reconfiguration of Taxiway H. 



Template revised September 22, 2016; format updates October 19, 2016.