PORT OF SEATTLE 
MEMORANDUM 
COMMISSION AGENDA               Item No.      4b 
ACTION ITEM 
Date of Meeting     March 8, 2016 
DATE:    February 29, 2016 
TO:      Ted Fick, Chief Executive Officer 
FROM:   Wayne Grotheer, Director, Aviation Project Management Group 
David Soike, Director, Aviation Facilities and Capital Program 
SUBJECT:  Concourse B Roof Replacement Project (CIP #C800770) 
Amount of This Request:        $1,211,000   Source of Funds:  Airport Development
Fund 
Est. Total Project Cost:          $7,262,000 
ACTION REQUESTED 
Request Commission authorization for the Chief Executive Officer to prepare design and
construction bid documents for the replacement of the Concourse B Roof at Seattle-Tacoma
International Airport for an amount not to exceed $1,211,000 of a total estimated project cost of
$7,262,000. 
SYNOPSIS 
This project will remove and replace the current roofing system on Concourse B of the main
terminal building at the Airport. The portions of the terminal roof being replaced were installed
in 1991 and are beyond their useful life expectancy. Warranties on existing roofs have expired
and testing of roof membranes by Airport maintenance staff indicates the membranes are
deteriorating.
This project was included in the 2016-2020 capital budget and plan of finance. This is the sixth
project in a series of roofing projects that replace roofing systems in a prioritized sequence. Staff
expects to seek Commission authorization later this year for construction authorization for this
project. 
BACKGROUND 
The first phase of the current cycle of roof replacement projects re-roofed the south end of the
Main Terminal in 2011. The second phase re-roofed the Fire Station in 2012 and the north end of
the Main Terminal in 2013. The third phase replaced the Concourse D roof in 2014. The fourth
phase will replace the Alaska Hangar One and associated maintenance building roof this summer
along with the fifth phase for the Concourse C Roof which is also scheduled for this summer. 


Template revised May 30, 2013.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
February 29, 2016 
Page 2 of 7 
PROJECT JUSTIFICATION AND DETAILS 
The Concourse B roof, similar to other critical systems, must be replaced as it ages and
deteriorates. The current roofing system on Concourse B is 25 years old and has reached the end
of its dependable leak free lifespan. Because the roofs are exposed to the elements and
experience wear and tear, when they fail the risk to the traveling public increases, and the safe
availability of the facility becomes impaired. In order to provide a leak free terminal
environment and safe experience for those who travel through and work in the facility, B
Concourse roof has been identified as the next roof to be replaced. 
The recommended replacement age for this type of roof is between 15-20 years. The warranties
have expired which has put the roof beyond the industry standard life expectancy. While the
Concourse B roof has experienced small leaks, as leaks grow, damage to the underlying
infrastructure will take place, and as a result, the renewal and replacement costs will grow as
well. Deferring this project until significant leakage occurs does not align with the strategy to
minimize long-term total cost of ownership.
While this has not occurred to date on Concourse B, as leaks occur there is the potential for
leaking water to enter the public spaces, and place both tenants and passengers at risk of slips
and falls. Should such leaks occur, the Airport would need to secure the portion of the concourse 
where the leaks are occurring during wet weather events as a preventative measure. This
however, is contrary to the Port's strategy of anticipating and meeting the needs of our
customers, as this action would take portions of the concourse out of service during a time of
increased usage and gate shortages. 
Per the Sustainable Airport Master Plan (SAMP), staff does not expect any significant changes to
Concourse B for at least 15 years. At some time beyond the 15 year mark, it is anticipated that
Concourse B will be changed significantly to accommodate widebody aircraft. This will likely
impact the roofing system significantly. The new roofing system would have a warrantable
period of 15 years minimum and dependable life span of between 15-20 years. 
Project Objectives 
This project will remove and replace the existing roof system on Concourse B at the Airport.
Replacing the roof helps to protect Port assets and assure a stronger positive customer experience
and avoids potential safety issues and concourse closures that can occur with roof leaks.
Replacing the roof supports the Airport Division's Strategy of Operating a World Class Airport.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
February 29, 2016 
Page 3 of 7 
Scope of Work 
Remove and replace the existing roof system on Concourse B; install a new elastomeric roofing
system; install ladders and fall protection; and replace and refurbish the existing Kalwall skylight
window/walls. 
Schedule 
Commission Authorization to Design:                       1st Quarter 2016 
Commission Authorization for Construction:                    3rd Quarter 2016 
Issue Notice to Proceed:                                  2nd Quarter 2017 
Construction Complete:                                4th Quarter 2017 
FINANCIAL IMPLICATIONS 
Budget/Authorization Summary              Capital     Expense   Total Project 
Original Budget                      $7,262,000          $0    $7,262,000 
Previous Authorizations                  $25,0000          $0      $25,000 
Current request for authorization            $1,211,000          $0    $1,211,000 
Total Authorizations, including this request     $1,236,000          $0    $1,236,000 
Remaining budget to be authorized         $6,026,000          $0    $6,026,000 
Total Estimated Project Cost              $7,262,000          $0    $7,262,000 
Project Cost Breakdown                     This Request       Total Project 
Design Phase                             $1,211,000         $1,211,000 
Construction Phase                                $0         $5,577,000 
Sales Tax                                      $0          $474,000 
Total                                      $1,211,000         $7,262,000 
Budget Status and Source of Funds 
The Concourse B Roof Replacement Project (CIP #C800770) is included in the 2016-2020
capital budget and plan of finance with a budget of $7,262,000. The funding source for this
project will be the Airport Development Fund. 
The per square foot estimated cost to construct the Concourse B Roof is higher than previous
roofs for several reasons: this roof requires more Kalwall replacement and refurbishment than
previous roofs (40% more than Concourse C); this roof has a greater level of complexity
associated with multiple elevation changes at the end of the concourse; and, costs have been
escalated because construction is occurring later (2017).

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
February 29, 2016 
Page 4 of 7 
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        $7,262,000 
Business Unit (BU)          Terminal Building 
Effect on business performance  Renewal/Enhancement 
IRR/NPV             N/A 
CPE Impact             .02 in 2018 
Lifecycle Cost and Savings 
The new roof system is not expected to have significant repair costs for the first 15 years. Preplanned
preventive maintenance tasks, and therefore costs, will be consistent with the current
maintenance program. Unplanned reactive maintenance call-outs, and those associated repair
costs are expected to be avoided in future years. 
STRATEGIES AND OBJECTIVES 
This project supports the Port's Century Agenda objective of meeting the region's air
transportation needs at the Airport for the next 25 years. The Airport must maintain its existing
facilities to accommodate current as well as future airline tenants and needs. 
Replacing the most distressed Airport roofs in a timely fashion as they deteriorate supports the
objectives identified in the Aviation Division's Strategy of operating a World Class International
Airport by: ensuring safe and secure operation; meeting the needs of our tenants and the region's
economy; and managing our assets to minimize the long-term total cost of ownership. 
During design, the Project Manager and the Office of Social Responsibility will work together to
maximize small business opportunities for this project. 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
Alternative 1)  Status Quo - Delay replacement of the Concourse B Roof 
Cost Estimate: $25,000-$50,000 potential ongoing annual expense cost per year for major repairs 
and the cost to replace the roof at time of failure which will be $7.2 million plus escalation 
Pros: 
No capital funding required. Leaves capital funds available for other projects.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
February 29, 2016 
Page 5 of 7 
Cons: 
The cost of a future roofing project in the event of roof failure would be the full cost of
replacement ($7.2 million) plus escalation and the cumulative ongoing expense costs.
Risk cost of lost terminal space due to emergency repairs  unknown but high. 
Will likely increase maintenance and emergency repair response over time. 
Increases the chances that the interior of the facility will be damaged due to water
infiltration. Damage to the interior of the facility would affect Customer Service.
Safety of the public could be compromised due to the slip hazard to traveling public and
employees. 
If a significant failure were to occur, portions of the terminal may need to be closed
during emergency repairs. 
The risk of significant or catastrophic failure increases over time with the further
breakdown of roof system materials. 
Indefinite deferral leads to risk of catastrophic failure. 
This is not the recommended alternative. 
Alternative 2)  Replace the B Concourse roofing system with a different system that could
last up to 30 years. 
Cost Estimate: $12.7 Million 
Pros: 
Helps to assure a stronger positive customer experience and avoids potential safety
hazards and concourse closures. 
Provides protection of port assets. 
Avoids the need for a future renewal and replacement project that will be disruptive to
the terminal operation at the 15 year mark. 
Cons:
Based on information provided by the SAMP team, the long-term configuration and
condition of Concourse B may change significantly in the 30 year timespan. There is
significant chance that a portion of the roofing system would need to be demolished
before the end of useful life. 
Due to the added material cost, handling cost, and structural design considerations to
strengthen ceiling support framing, this is the most expensive alternative. 
This is not the recommended alternative.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
February 29, 2016 
Page 6 of 7 
Alternative 3)  Replace Existing Roof with a 15 year roofing system. 
Cost Estimate: $7.2 Million 
Replace the B Concourse roof with a roofing system of similar lifespan, and incorporate
enhanced safety features. Through our previously developed "phased" roof replacement efforts
we have identified all Port owned roofs that will reach the end of their serviceable life span. We
have identified plans and schedules to replace them, with B Concourse identified as the next
reroof.  In an effort to be timely, get the most competitive bids and take into account our
inclement  weather seasons, design is targeted 2016 with actual roof replacement to be
accomplished in 2017. 
Pros: 
Provides for the viability of the facility for the foreseeable future. 
Based on information from planning staff, this building will not be affected by the SAMP
for at least 15 years. 
This project would provide for a warranted roof that will minimize the cost of roof
repairs going forward for the foreseeable life of the roof. 
Helps to assure a stronger positive customer experience and avoids potential safety
hazards and concourse closures. 
Provides protection of port assets. This option does the best job of supporting the goal of
managing Port assets to minimize the long term total cost of ownership. 
Cons: 
This project would consume capital funds that could possibly be utilized on other
projects. 
This is the recommended alternative. 
ATTACHMENTS TO THIS REQUEST 
Map with Location of Concourse B 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
February 9, 2016  the Commission authorized construction funds for the 2014-2015
Roof replacement. 
May 19, 2015  the Commission authorized design funds for the Concourse C roof
replacement. 
June 10, 2014  the Commission authorized design funds for the 2014-2015 Roof
Replacement project. 
April 1, 2014   the Commission authorized a budget increase of $219,000 and
execution of a major public works construction contract with the low responsive and
responsible bidder for the Concourse D roof replacement.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
February 29, 2016 
Page 7 of 7 
January 28, 2014  the Commission authorized construction funds for the Concourse D
roof replacement. 
July 9, 2013  the Commission authorized design funds for the Concourse D roof
replacement. 
January 8, 2013  the commission authorized construction funds for the North End
Main terminal roof replacement. 
January 24, 2012  the Commission authorized construction funds for the Fire Station
roof replacement. 
July 26, 2011  the Commission authorized design funds for the second phase of the
Airport re-roofing program including design of the Fire Station and North End Main
Terminal roof replacements. 
November 30, 2010  the Commission authorized construction funds for the South End
Main terminal roof replacement. 
April 27, 2010  the Commission approved design funds for the South End Main
terminal roof replacement. 
September 22, 2009  the Commission was briefed on the facility renewal project that
was necessary in future years. The Airport re-roofing program was included in the
presentation